Mold quality control points

Mold quality control points

A, the rationality of the mould design

Structure design is reasonable is the key to the quality of a complete set of mold, mold production cycle, so for the mold structure design and manufacturing process must attach great importance to, be sure to do reasonable as far as possible, to get twice the result with half the effort. Thus design it necessary to pay attention to the following:

plastic injection molding and china mold maker

1. When the mould structure design should pay attention to how to make the production process, easy to do. Plastic pieces of the size of some key parts (such as dimension, high precision size or contract) in areas such as the uneven tolerance reserve the direction of the steel material selection, so that need change after test module and have a chance of correction, and avoid possible welding such as remedies.

2. Mold design for putting small and more or mold eccentric structure, mould should be under the guide pillar structure. The launch of the hole for multiple rib ventilation window can decorate a few first, but pay attention to the position of the reserved (avoid water), so that can increase when necessary to launch holes or increase the rib Angle so that the mold. Strict in plastic parts shape and can't feed, try to adopt the way of diving or putting diving feed.

3. The mould design is completed, need comprehensive review all drawing size especially mutual need to fit the size and type bit size accurate, can only be a formal processing drawings, all employees participating in the mold production to each process control according to the requirements of size. Second, the quality control of mold material

We manufacture I mold are small batch or single production, processing process is complex, manufacturing cycle is long, the mould parts of raw materials for processing using even affected the quality of the mould of a complete set of, according to the present production condition, from the mold production necessary

The aspects of mould materials for quality control.

1. Should choose fixed, with stable quality assurance materials suppliers. For key mold parts material, required to provide product certification; When necessary for material composition test, inspection quality inspection, etc.

2. The material into the factory inspection work earnestly. Requirements:

1) material chemical composition is correct. (use spark discriminant);

2) good quality of materials and forging surface smooth, no obvious crack folding, scarring, slag inclusion, open side after texture

Even, no cracks, porosity, slag inclusion and other surface; 3) delivery hardness appropriate size (HRC26-32) right;

4) die set to check the datum, the parting surface precision, A and B plate material quality, and provide mould frame factory inspection requirements

The report.

3. The production process at any time to monitor quality of materials, die set, found that the problem is detailed record and feedback management personnel handling.

Life in plastic products

Life in plastic products

      

In everyday life we often see plastic are the following: polyester, polyethylene, polypropylene, high density polyethylene, low density polyethylene, polyvinyl chloride, polystyrene. In fact, these are our common "1-7" plastic.

PET: polyethylene terephthalate used to make water bottles, Coke bottles, juice bottles, screen protective film and other transparent protective film, usually colorless and transparent. Because it can heat to 70 ℃, so this only suitable for cold drink bottles and warm drink, put hot liquids (such as: hot water) or heating the deformation, there are harmful substances leaching; and the plastic products after using 10 months, may release carcinogenic, toxic to humans.

Advantages: high transparency, can see the contents of the bottle; acid, can be loaded carbonated drinks; waterproof high and difficult to bleed. Note: non-toxic, but the synthesis process may remain single, low molecular weight oligomers and side reaction products such as diethylene glycol, these are some toxic, PET raw material for beverage bottles countries have strict standards. Material PET plastic bottles can not be placed on the car sun; not install wine, oil substances, harmful substances that can dissolve it. Do not install more than 70 ℃ liquid, high temperature can cause the material decompose to release harmful chemicals.

HDPE: High density polyethylene suitable for loading food and medicines, equipment cleaning supplies and bath products, shopping bags, garbage cans, etc. At present, the use of plastic bags in supermarkets and shopping malls are mostly made ​​of such material, can withstand 110 ℃ high temperature, indicating food bags can be used to dress the food. HDPE is widely used in a variety of translucent, opaque plastic containers, thick feel.

Advantages: relatively resistant to various corrosive solutions, and more are used in cleaning products, bath products. Note: The dress cleaning supplies, bath products bottles can be reused after cleaning, but these containers are usually not wash clean, the residual material will become a breeding ground for bacteria, it is best not recycling, especially in full bloom cycle is not recommended as the Food and Drug the container uses.

PVC: Polyvinyl chloride PVC is now used for the manufacture of some cheap leather, floor mats, water pipes, etc.; due to its good electrical performance has a certain self-retardant properties, is widely used in the manufacture of wire and cable sheath. In addition, PVC is widely used in industrial fields, especially for acid corrosion in high demand areas. Commonly used in: raincoats, PVC plastic pipe lines, water pipes, plastic switches, sockets

Advantages: high strength, resistance to climate change and better corrosion resistance. Note: this material can only heat 81 ℃, and therefore can not be used at higher temperatures. Is likely to precipitate toxic when used in the production of a large number of PVC plasticizers (plasticizing agents, such as DOP) and heat stabilizers containing heavy metals, and the synthesis is difficult to eliminate the presence of free monomers, and the high temperatures encountered in oil, carcinogenic so PVC in contact with the human body, especially in medicine and food applications, replaced by the PP, PE basically.

     4, low-density polyethylene (LDPE)

Plastic film and plastic wrap, made ​​of paper milk cartons, drink boxes and other packaging are using it as an inner foil. Utensils used for the plastic film, not as a beverage container. Commonly used in: cling film, plastic film, toothpaste or cleanser hose packaging. Pros: good ductility, use in life is extremely broad. Note: LDPE products at higher temperatures due to softening or melting, should avoid the use of higher water temperatures under 100 ℃. Cling film at temperatures above 110 ℃, there will melt and, therefore, the food placed before the microwave, first remove the cling film wrapped. 5, polypropylene (PP) microwave meal made ​​using this material, resistant to 130 ℃ high temperature, transparency is poor, this is the only place in microwave plastic boxes can be reused after careful cleaning. PP high hardness and surface gloss. PP is also very broad range of use, everyday items such as packaging, toys, basins, buckets, hangers, cups, bottles, etc.; engineering applications such as car bumpers. PP spun yarn is known as polypropylene, textiles, non-woven fabrics, ropes, nets and other products are common.

Commonly used in: disposable juice, beverage cups, plastic plate, Lock & Lock crisper and so on. Pros: good air permeability, heat temperature up to 167 ℃, is the lightest plastic containers. NOTE: If the temperature is too high, the body will not have gas diffusion out. In addition, some microwave meal box body is made of PP, but the lid is made ​​of the 6th PS, carefully checked before use, if such a situation should first remove the lid after heating. Products compared to PE, PP products slightly better heat resistance, typical Lock & Lock glass using temperature can reach 110 ℃, but then there is a high temperature melting softening and dangerous, and should be avoided.

6, polystyrene (PS) used in: ice cream containers, snack, cheap transparent products, foam, CD boxes, cups, snack, insulation material layer. Advantages: transparency, heat resistance is superb, used to install high-temperature foods, such as bowl of instant noodles (now multi-use paper containers), cold resistance, a variety of ice also love to use this container.

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Injection molding common problem

Injection molding common problem

1, injection molding products warp and contraction deformation causes?

Answer: 1, cylinder temperature is too low; 2, short forming period; 3, the injection pressure is too high; 4, the injection speed quickly; 5, the holding time is too long; 6, uneven mold temperature, should adjust the mould cooling system, setting up reasonable cooling circuit; 7, gate section is too small; 8, ejection mechanism design is unreasonable, should try to increase the out area and point out; 9, die strength is insufficient, should try to increase its rigidity.

2, what is the causes and solutions of product ellipse?

A: ellipse is uneven due to the rubber products, product all round pressure not divide evenly, make products to elliptic. Solution: use 3 into the glue, make the product into the glue.

3 when using black color masterbatch, ABS, peeling products is easy to break, how to solve?

A: mother color pigment used in the carbon powder is overmuch, cause product peeling. Replaceable mother color pigment.

4, white products appear black spots, mixed color, how to control?

Answer: 1, the raw material. In the process of mixing materials, ingredients, pay attention to clean, prevent the impurities, mixed with dust; 2, the machine. (1) inside the cylinder to clean, screw on the presence of carbonized layer and rubber product; (2) the screw head, nozzle flange and nozzle parts whether matter, inner surface smooth and no dead Angle phenomenon; (3) the screw head for wear and tear, screw to install center degrees whether meet the requirements, presence of oscillating phenomenon. 3, mold. Mold flow channel without acute Angle, injection points shoulds not be too small.

5, injection molding products owe note the cause and the elimination method have?

A: plastic injection products owe note the cause and the elimination method basically has: 1, the melting temperature is too low, will raise the cylinder and nozzle temperature; 2, molding cycle is too short, should be appropriately extended; 3, low injection pressure, should be appropriate increase; 4, the injection speed too slow, should be appropriate to speed up. 5, the holding time is short, should be appropriately extended; 6 and underfeeding, should increase for shoes; In July and screw back pressure on the low side, should be appropriate increase. 8, gating system structure of small size, should be appropriate amplification and gate flow channel section. 9, mold venting is not good, should increase the vent, improve the exhaust performance of mold; 10, die strength is insufficient, should try to improve the rigidity of the die.

6, injection machine inlet temperature have any impact on product?

Answer: the inlet temperature too high or too low, can cause the machine back to the material is not stable, make add capacity is not stable, affect the size and appearance of the product.

7, set the injection molding process step is what?

A: set the injection molding process steps: 1, set the temperature of melting; 2, set mold temperature; 3, set screw dislocation and speed; 4, set back pressure; 5, set maximum injection pressure to the machine; 6, set pressure; 7, set injection speed; 8, set the holding time; 9, set the sample cooling time; 10, set to open mould time; 11, setting out board stroke; 12, minimize the holding time.

8, the main reason for the injection molding products have flash? What are those?

A: the main cause of injection molding products have flash are: 1, the template is not flat, or template insufficient rigidity and deformation; Haven't enough 2, clamping force, mold locking; 3, the injection pressure is too high; 4, raw material MFR value too high, the melt viscosity is low; 5, material temperature, mold temperature is too high.

Rapid Prototype

Rapid Prototype

Rapidprototyping can provide you eyeable and tangibly 3D models from the design. According to the prototype, you can validate the precision, rationality, aesthetics and the correctness of the structural design. Rapid prototyping can be useful for checkup, exhibitions etc. It can be the sample mould to save time and to make mould accurately and fleetly.

We use 2D and 3D software to make the parts, such as Solid works, PRO-engineer (igs*, x-t*, step, *STP, stl*), CAD, JPG*, PDF* files etc. Welcome customer’s inquiry us. Hope we have chance to try to cooperate with each other.

Place of Origin: Shenzhen China (Mainland) Shaping Mode: CNC machining

Product Material: Plastic surface: Smooth method: CNC

Packaging & Delivery

Packaging Detail: Carton case or as per client’s requirements

Delivery Detail 6-7days

Specifications

CNC Plastic rapid prototype

1. 5-7 days lead time

2. Method are CNC machining and CNC turning

3. IGS or STP or PRO/E formats

CNC plasticrapid prototyping:

1. Material: plastic

2. Manufacture methord: CNC machining, CNC turning

3. Surface finish: Smooth

4. Lead time: 5-7days

CNC rapid prototyping process:

1. Confirm the customer’s 3D drawing and edit program

2. Processing them to process drawing with CNC machines and lathe

3. Burring the flash

4. Check the dimension of the parts.

6. Package with carton

7. Delivery them with DHL or FedEx

Product quality is the lifeline of business

Product quality is the lifeline of business

In market economy increasingly developed of today, commodity quality cash we shopping centre enterprise of importance increasingly strong, commodity quality of high and low is enterprise have core competitiveness of reflected one of, improve commodity quality is guarantee enterprise occupies market, thus can hook continued operating of important means, a Enterprise wanted to big do strong, in enhanced innovation ability of Foundation Shang, efforts improve commodity of quality level for enterprise of importance, goes without saying that, does not focusing on products of quality, eventually will even, lip.

According to statistics, the average lifespan of an enterprise is only 7 years, who ruthlessly eliminated by market enterprises may have a variety of issues of internal management and external market conditions deteriorated, but there is no doubt that enterprise are planted in many shopping centres do not pay attention to the quality of goods this link. Quality is more important than ever today, is because the market environment compared with the era of commodity shortages, fundamental changes have taken place, as long as they can produce will sell off the era is gone. Successful Mall enterprises without any exception attach importance to the quality management of goods. Important issues of quality management is the Mall survive today, highlights the importance of the quality of goods. A small, kuiyuyixue, imagine if to ensure the quality of not strictly, then they would damage the interests of consumers, caused by beginning enterprise image will plummet, the products unsalable will be inevitable. Doing quality work, is everyone's responsibility. Therefore, pay attention to product quality problems, are also important issues of today's enterprise development must be taken into account. Quality is the foundation of Mall business, no quality, talk about development, competition is hot air. For Mall business for us, quality is the cornerstone of our survival and development. In my opinion, if an enterprise wants to build its own brand, quality is one of the indispensable conditions. Just like a machine, is comprised of thousands of different parts tie into a function, effects depend on each part of a machine up and running properly, feature is played out, with the accuracy. And quality, is this one of the parts. Only by giving full play to the role of each component, in order to ensure the normal operation of the machine. Quality is the cornerstone of business survival, quality is the development of "golden key", in other words the quality is enterprise's life. "People-oriented and focus on quality, standardize management, continuous improvement, customer satisfaction" is our eternal principle of service and corporate philosophy. In short, quality is the foundation of the enterprise, the quality is enterprise's life. Only put the emphasis on quality in the work of the first, to catch it as life, meticulous, excellence, always maintaining high quality and efficiency, only in this way in order to remain invincible in the fierce competition.

Our 14 years focused on plastic injection mold making and injection molding. We offer more than just die, it is of high quality products and good service!

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Plastic applications

Plastic applications

We specialize in precision injection mould design, manufacture and precision injection molding.

Tidy on plastic materials based on many years of work experience in the practical application of experience:

One feature 1, definitions of commonly used plastics materials: plastic plastic is a synthetic or natural polymers as the main constituent of substances usually contain additives such as secondary ingredients, broadly speaking, he is a certain temperature and pressure could create a certain shape of plastic polymer organic material. Published in 1996, the new national standard (GB/t 2035-1996) plastics redefined as: polymers as the main ingredient, and at some stages of processing into finished products can flow molding materials.

2, the composition of the plastics: Plastics is the main ingredient of synthetic resin, coupled with some additives and fill material.

A,----of synthetic resins and synthetic organic macromolecular compound, its structural unit mainly consists of carbon, hydrogen, oxygen atoms and others such as sulfur atoms and silicon atoms by chemical bonds, and other connections. -----B, fill materials with glass fiber, carbon fiber, calcium carbonate (CaCO3), silicon dioxide (SiO2), cotton cloth, metal, wood flour, asbestos, mica and stone powder.

C, additive---------common plasticizers, stabilizers, lubricants, colorants, antistatic agent, flame retardant, UV-resistant agent and so on.

3, in General, plastic materials can be divided into two categories: "thermoplastic plastics" (Thermoplastic) and "thermosetting plastic" (Thermosetting). Thermoplastic plastic at room temperature, typically a granular, heated to molten state after a certain temperature, cooling it after curing, if heated it becomes molten state again, and again in plastic molding. Therefore, the thermoplastic plastic melt repeatedly by heating curing, Thermo-plastic plastic waste can often be recycled so, that is, a so-called "secondary". In contrast, thermoset plastic is heated to a certain temperature curing, even continuing heated cannot change its status. Therefore, the thermosetting plastics cannot repeatedly by reheating, thermosetting plastic waste is often not recycled.

II, plastic by application of range also may is divided into general plastic, and engineering plastic, and special plastic; General plastic common of has: PP, and PVC, and PE, and PS, and,; engineering plastic common of has: ABS, and PC, and PMMA, and POM, and PA6, and PA66, and PET, and PBT, and SAN,; special plastic common of has: PPS, and PEI,; engineering plastic often by some general plastic modified sexual are; as changed some molecular structure, and added other components as glass fiber,Project is to be used as industrial parts or shell material of plastic for industrial use, its strength, impact resistance, heat resistance, hardness and resistance to aging of plastic.

Its features include: a, thermal properties of glass transition temperature (Tg) and melting point (Tm) and high heat distortion temperature (HDT) high, the long-term use of high temperature (UL-746B), using small temperature range, thermal expansion coefficient.

B, mechanical properties: high strength, modulus, low latent degeneration, high mechanical resistance to wear and fatigue.

C other:, excellent chemical resistance, fire resistance, electric resistance, dimensional stability and excellent weather resistance.

Practical application of the common plastic materials 1, ABS material: most commonly used plastic material, many household electrical appliances shell are made of it. With high mechanical strength, heat resistance, chemical resistance and high gloss. Common are Taiwan Chi Mei, and country Joe of ABS. Chimei: ABS PA757 general purpose grade, good gloss; ABS PA727 plating grade ABS PA777D heat resistance level.ABS usually heat denaturation temperature of not more than 88 degrees centigrade.

Its features include: a, thermal properties of glass transition temperature (Tg) and melting point (Tm) and high heat distortion temperature (HDT) high, the long-term use of high temperature (UL-746B), using small temperature range, thermal expansion coefficient.

B, mechanical properties: high strength, modulus, low latent degeneration, high mechanical resistance to wear and fatigue.

C other:, excellent chemical resistance, fire resistance, electric resistance, dimensional stability and excellent weather resistance.

Practical application of the common plastic materials 1, ABS material: most commonly used plastic material, many household electrical appliances shell are made of it. With high mechanical strength, heat resistance, chemical resistance and high gloss. Common are Taiwan Chi Mei, and country Joe of ABS. Chimei: ABS PA757 general purpose grade, good gloss; ABS PA727 plating grade ABS PA777D heat resistance level.

ABS usually heat denaturation temperature of not more than 88 degrees centigrade.

3, nylon PA6, PA66. Polyamide (Nylon) maximum advantage of toughness, excellent fatigue resistance, low coefficient of friction. Often used to make fibers, toothbrush, shredded fish, bushings, packaging film, gears, electric tools, shell, electrical parts, and so on. But the biggest drawback is absorbent, absorbent falling sharply increase its tensile strength. Such as adding a glass fibre can greatly improve its heat-resistance, that is, PA66+GF15%, PA66+GF30% temperature resistance up to 180~210℃. Therefore, there is no plus glass fiber nylon shall not be used for parts with high temperature requirements.

Plastic beer come out as soon as possible after use to avoid placing takes too long to make adverse changes have taken place after water absorption nylon.

Experience only, hope to give you help!For more information,please go to www.chinamoldmaker.org    www.plastic-injectionmoulding.com

Industrial Design

Industrial Design:

For providing better service for our customer and improving our competitiveness, we built a special elite’s team to focus on industrial design in 1997, we are committed to helping our clients improve enterprise brandimage, enhance the brand value, shorten the development cycle, reduce the production cost,. Since CNMOULDING have rich experience on mold building and injection. We can easily provide one stop OEM service, also provide separate service : Industrial Design;Appearance Design; Product Structure Design .In the past two years, the great team made a big successful . a lot of case were accepted by customer and realized to mass production.And help our customer totally capture the competitive market.

Mold design:

The high quality mold is the core business of CNMOULDING .we have 5 special mold designers, who have rich experience in plastic properties and mold structure. And they will take each case seriously ,before designing start, our designer will run Mold Flow Analysis and attend a technical meet for each mold with tool shop and injection Dept. to avoid potential manufacture problem and trouble shoot. all of this is the strong guarantee of our high quality and short lead time

Our service include :

Industrial Design

Appearance Design

Structure Design

Mold Design (2D & 3D)

DFM (Design for Manufacturability)

Mold Flow Analysis

biColor mold

biColor mold

A. bicolor forming principle

Two-color injection molding generally refers to two colors or different kinds of plastic molding, since the twotwo - color injection machine and the nozzle unit is separate and distinct, and therefore the color of the finished product is mostly clear two - color is not mixed together. Mold can be two different two - color characteristics of the resin and color, into a single color products, can reduce the molded product group legislature and post-treatment works. Save the cost of printing dissolved, increase the aesthetic visual effect of the product, enhance the added value of products. Not only have non-slip, increasing the friction function, flexible resin material to make it more ergonomic.

two - color injection molding machine and the general standard injection molding machine What is the difference?

two - color machine with the biggest difference lies in the general injection molding machine injection unit machine activity template design. In general, two-color machine has two independent separate injection unit, generally only one set of injection molding machine injection unit. Two configurations of the two injection units with the manufacturers of the design in many forms, as the activity template design is rotating mechanism must be provided, the general common design such as increasing the dial or shaft mechanism, so as to provide 180 ° reciprocating rotation, so that the mold to produce cyclic alternating movement. Another mold you do not need some special two - color wheel or shaft mechanism, but by mold or horizontal sliding alternately rotate.

B. Introduction bicolor mold

In the form of two - color mode

1. The two-color mode: two on the same plastic material injection molding machine, a two-molding, but the product is only the first mold. Usually this

Kinds of double injection molding process is also called, is usually done by a set of molds, and the need for specialized color injection molding machine. Which is divided into two 1-1. Carousel (rotary die holder) This mold has two male two female mold mold design time and points a shot and the secondary injection, usually once a feeding tube exit is on the left, two second injection on the right tube.

1-2 rotating plate like this mold structure focused above two male mold and two master mold, the difference is only in the rotation with the top two male mold base, and the rotation axis of rotation of the board is to use the board (male template) male die holder does not rotate, so the board shall be designed rotating shaft structure designed in the heart

2. overmold: two plastic materials are not necessarily on the same injection molding machine, a two-molding; product from a mold in the mold removed

, Then put another set of molds for the second injection molding. So, in general this molding process is usually done by two sets of molds, without the need for a dedicated two - color injection molding machine. Injection mold with its monochromatic mold structure is the same, mainly by adjusting the injection parameters to control the flow rate of material species binding sites.

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The company of characteristic

The company of characteristic

The company from its inception in 1997, had more than 14 years of development history and accumulated rich a lot of experience in mold making. For the United States, Germany, Italy, Switzerland, Korea and other customers to provide quality mold making and injection molding services.

Our inexpensive form gone through more than 10 years, have also made striking achievements, but we also need to be clear is to know, rigid mold making and service model has far cannot satisfy the growing demand of the customer. If there is no change in our enterprises, enterprise development will be stagnant.

Enterprise diversification is the future of die and mold industry trends. Therefore, provides customers with mold making and injection molding, it also provides product design, rapid prototyping, and so on. Satiety  the  different need of customers.

Now we has been formed to mold manufacturing, injection molding, product design, hardware processing, supplemented the diversified company.

We are willing to provide you with the injection mold-related services, please visit www.plastic-injectionmoulding.com  or www.chinamoldmaker.org for more information

overmolding mould china

overmolding

" Povermolding " is actually a kind of secondary injection molding, products generally includes main body (hard plastic) parts and outsourcing (soft glue), in the mold manufacturing, manufacturing hard plastic main body first, hard plastic mould design program is designed according to the normal subject, outsourcing (soft glue) mold design to hard plastic products as a reference, need not put shrink again, after mold parts, with hard plastic on the main body, front mould have plastic bags shape is different, in Mr Production output hard plastic main body, and then put the hard plastic main body in the outsourcing mould, into the soft plastic injection molding production outsourcing

2. " overmolding " characteristics

1) calculate shrink when main hard plastic parts die design

2) "overmolding " usually has two independent sets of mould

3) soft package mold after the mold parts with hard plastic one to main body, to avoid a small amount of space, hard rubber for rubber and plastic parts to use subject to become a phantom

Note TPU material, the characteristics of itself is relatively easy to stick mold, product if you can do the sand sand as far as possible, so easy to release! Liquidity of TPU is slow, cooling cycle will be longer, as long as pay attention to some in the production process, also won't have much of a problem!

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Composite auto parts china

Composite auto parts

Automotive plastic to improve car performance and lightweight appearance plays an increasingly important role requirements. Emphasis in the automotive lightweight when it comes in a plastic found in this area. Whether it is the body, interior and exterior parts and other places, you can find different kinds of plastics applications. As one of the world's largest carmaker, BMW (BMW) is also due to be a trend, use a lot of plastic. Currently, automotive plastics by ordinary decorative purposes, development to manufacture structural and functional components also rising, such as heat resistance, high strength and impact resistance is the most common requirements, methods are generally dealing using composite materials or plastic alloy

Parts on the car using composite materials primarily dashboard, door guard, inner fender cover, carpet, seats and parcel shelf boards, this form of parts used in addition to meet certain functions, but also make people feel comfortable beautiful, but because of the kind of material production process is simple, low cost, applicability and developed more rapidly, it will be the main direction of development in the future of automotive interior materials.

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Automobile industry drives the mold production

Automobile industry drives the mold production

Auto mould is still the most widely DaiDongMian, the field of industry development is rapid, every car HuanXing need thousands of pair of mould, auto makers has formed with the closely matching mould enterprise development, research and debugging technology, production of strategic alliance. Cars are increasingly high strength plate in order to reduce weight, also for some ultra high strength plate hot forming and the corresponding hot forming mould has naturally become the development trend.

Mold to use plastic lighter will increase and the development of new materials, including all kinds of new plastic, modified plastic, metal, plastic, magnesium alloy, composite material, and so on, this requires a new forming technology, which also requires that have adapted to the new mold. According to network mold, China mold in the future in the market, the proportion of total plastic mold in the mold will gradually increase, its development speed will be higher than other mold.

"Mould to elegant, requires good appearance generous, internal defects, this would require careful, precision mould with high quality. At present, the refinement has a big gap, refinement is often ignored by some companies, the results fell short." Company, I think that the mold fast and efficient production, this mould enterprises try to shorten the mold production cycle, to mold the user mould as soon as possible, on the other hand is more important, the user can you provide a mold to production products more quickly and efficiently. Such as more than a multi-cavity mould production, laminated mold, forming time and make good use of hot runner technology to shorten the use of multilayer composite technology, mould decoration technology, highlights non-mark injection molding technology, testing technology and process of composite technology and transfer technology and so on, at the same time stamping forming process intelligent also requires intelligent mold to adapt.

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Precision injection molding and the common points of precision injection molding

Precision injection molding and the common points of precision injection molding

The characteristics of precision injectionmolding is: the size of the injection molded parts with high precision, small tolerance. To achieve the requirements of precision injection conditions must be met:

(1) the mold material is better, rigid, cavity dimension precision and template between positioning accuracy is higher, lower surface roughness.

(2) to adopt precision injection molding machine.

(3) to adopt precision molding process. (

4) to choose suitable for precision injection molding process of the material. Commonly used precision injection molding materials have several: POM, POM = CF (carbon fiber), PNM = GF (glass fiber), PA \ FRPA66 (enhanced PA), PC, etc.

Precision injection process can ensure the size precision injection molding is the important way to control the shrinkage of injection molded parts, including: thermal contraction, disguised contraction of molded parts, orientation and compressed contraction and elastic recovery.

Common injection molding features are: precision is not high, the size of injection molded parts are typically can be assembled into standard, requirements for the appearance of the injection molded parts is relatively high, if necessary, may use the second processing (oil, for example) to improve the appearance of defects. Ordinary injection molding don't need to use special precision injection molding machine, also do not need to specially designated materials, general common thermoplastics can be used to production. So ordinary injection molding technology is widely used in modern plastic industry.

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electrical and electronic engineering plastics application

electrical and electronic engineering plastics application

Compared with general plastics, engineering plastics has more excellent mechanical properties, electrical properties, chemical resistance, heat resistance, abrasion resistance, dimension stability, etc; Compared with metal materials, engineering plastics has the advantages of light weight, small energy consumption when molding. Engineering plastics has become the world's plastics industry developing the fastest growing materials

In Asia, engineering plastics are mainly used in electrical industry, more than 50%, and in Europe and the United States, engineering plastics are mainly used in automotive industry. From 1998 to 1998 China engineering plastics consumption annual average increase rate of 26% (see chart 1). Is expected in the next few years the growth rate of 15% ~ 18%. As China's electrical products exports increased year by year, the dosage of the engineering plastics is on the rise. Although the current domestic product technology content and added value is very low, but this does not affect the huge demand for engineering plastics manufacturing. Under cost pressure, requirement for material localization is more and more obvious, which provides a broad prospect of application for engineering plastic.

Commonly used on electrical and electronic engineering plastics

1. The PA (nylon)

PA is characteristic of good toughness and high mechanical strength, wear resistance, but easy bibulous deformation. Mainly used in the manufacture of machine tools in electrical and electronic appliances, air switches, connectors, all kinds of coil skeleton; Tape recorder, video camera, video camera, DVD, OA equipment, machine core, skeleton, supporting parts, gear, wheel; As well as the cable bracket, brace, gear, wheel; And the cable sheath, household appliances, small appliances, etc.

2. PC (polycarbonate)

The advantage of PC is transparent, high impact strength, good mechanical strength, size stability. Drawback is not resistant to solvents, easy to produce stress cracking. Mainly used in the transparent parts of the electrical appliances (such as window, shell, panel, etc.).

PC/ABS alloy is more used in electrical appliances shell, display case, mobile phone shell, shell, batteries, laptop charger shell; Cable connector, OA equipment and small home appliance products.

3. The POM (POM)

POM has superior mechanical properties. Wear resistance and size stability, resistance to chemical corrosion, fatigue resistance, but poor thermal performance, flammable easy decomposition, notch sensitivity. Mainly used in electrical appliances, instrument structure, all kinds of gear, CAM, driving wheel, the recording tape axis core, floppy disks, the doors of machine tool electrical appliances.

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What is called a precision injection molding

What is called a precision injection molding?

Precision injection molding, strictly speaking, refers to by injection molding machine equipment to produce the dimension precision of plastic products, can achieve below 0.01 mm, usually between 0.01 ~ 0.001 mm a way of injection molding production. "Precision injection molding" this concept, main is different from the conventional injection molding, with the rapid development of polymer materials and microelectronics technology, highly integrated electronic circuit, make industrial equipment parts gradually for the development of high-performance, high precision, lightweight, miniaturization and miniaturization. This precision plastic parts for compliance with the requirement of high precision, and at the same time have good machinery, mechanical properties and dimensional stability, etc, in machinery, electronics, instrumentation, communications, automotive and aerospace instrumentation and other industries fields, replaced the part precision metal parts and has been widely applied. By the definition of precision injection molding, precision plastic pieces of the size of the tolerance range is very narrow. And, in fact, the plastic molding industry recognized, when the size of the plastic parts of tolerance is under 0.1 mm, or size of plus or minus tolerance is under 0.1 mm parts, precision molding, can be called the size tolerance of parts reach micron grade, may call it super precision injection molding.

Plastic key features

Plastic key features:

① most plastic lightweight, chemically stable, will not rust;

② good impact resistance;

③ has good transparency and abrasion resistance; ④ insulation, and low thermal conductivity;

⑤ general formability, good color, low processing costs;

⑥ most plastics poor heat resistance, thermal expansion, easy to burn;

⑦ poor dimensional stability, easily deformed;

⑧ most plastics poor low temperature resistance, low temperature brittle;

⑨ easy to aging;

⑩ certain plastics soluble in solvents.

Plastics can be divided into two types of thermosetting and thermoplastic, the former can not be re-shape to use, which can be repetitive.

Plastic polymer structure, there are two basic types:

The first is a linear structure, a polymer compound having such a structure is called a linear polymer compound;

The second body structure is a polymer compound having such a structure is called a polymer compound body. Some polymer having a branched chain, a branched polymer known as belonging to the linear structure. Although some polymer intermolecular crosslinking, but crosslinking less known network structure, body structure belongs.

Two different structures, showing two opposite properties. A linear structure (including the branched chain structure) of the polymer molecules due to the presence of a separate, and therefore, flexibility, plasticity, can be dissolved in a solvent, the heating can be melted, the hardness and brittleness of smaller features. Since there is no independent body structure of polymer macromolecules exist, so there is no elasticity and plasticity, can not dissolve and melt, only swelling, hardness and brittleness. Polymer plastic has the two structures, made ​​by the linear polymer is a thermoplastic plastic, a polymer made ​​by the body are thermosetting plastics.

Compared with other plastic materials

<1> resistance to chemical attack

<2> shiny, partially transparent or translucent

<3> is a good insulator mostly

Light <4> weight and sturdy

<5> can be processed easily mass-produced, inexpensive

<6> versatile, multi-utility, easy coloring, and some high-temperature plastic is also divided into pan with plastic and plastic, the main purpose is to define the breadth, such as PE, PP cheap, available in a variety of different types of production of the machine. Plastic is more expensive, but raw material stability

And physical properties are much better, in general, it also has two characteristics of rigidity and toughness.

Plastic advantages:

  1, most of the plastic of the corrosion resistance, strong acids, bases and the reaction is not.

2, low-cost plastic.

3, durable, waterproof, lightweight.

4, easy to be made ​​into different shapes of plastic.

5, is a good insulator.

6, the plastic can be used in the preparation of fuel oil and fuel gas, which can reduce oil consumption.

Disadvantages of plastic

1, the recycling of waste plastics, classification is very difficult and economically viable.

2, plastic is easy to burn, produce toxic gases when burned. Such as polystyrene produced during combustion of toluene, a small amount of this substance can cause blindness, vomiting and other symptoms of inhalation, PVC burning will produce toxic hydrogen chloride gas, in addition to burning, is a high temperature environment, will lead to plastics decompose toxic ingredients, such as benzene and so on.

3, the plastic product is made ​​of petroleum refining, petroleum resources are limited.

4, the plastic can not be natural decomposition. 

more information www.plastic-injectionmoulding.com www.chinamoldmaker.org 

Injection operator processing requirements

Injection operator processing requirements

A, plastic product quality requirements

1, the injection forming of product, must ensure that the product structure is complete, there is no less material, more material phenomena.

2, product surface bright, uniform chromaticity, full.

3, product surface is not filled with flowers, impurities, defects such as black spots.

4, the product shape neat, there is no deformation, distortion, and the internal products are obvious bubble phenomenon.

5, the product can cooperate with relevant parts is normal, without external force cannot be separated.

6, the assembled product to need, after assembling the operators need to introspection, to ensure that products meet quality requirements. There is no

Not installed in place, packing, and have a fracture phenomenon.

Second, the plastic products trimming

1, the product of the inlet with trimming knife cutting, cutting mouth who can not have express white appearance.

2, when trimming knife trimming, forcibly when repairing products shall repair products outside introversion, resistance force direction is not allowed to have another hand

Block.

3, product trim on the handle of the strength should be uniform, can guarantee a hard cut products as much as possible, long group of front, middle

Not stagnation, a fix to the end, to ensure that after trimming the edges of the beautiful appearance.

4, the surface of the product by trimming does not allow defects wavy lines and uneven.

5, to remove the inlet area, trimming should level off, allow the phi 10 from minor scratches, trimming to improper

Other parts are not allowed to have should be trimming undeserved cause scratch defect.

6, to put front height is greater than 0.2 mm should be handled for trimming (unless adjust injection parameters to solve), especially in the production

Product outline on the edge of the phi front must be removed.

7, for different products, it is suggested that should use different types of trimming knife, to ensure product quality, improve the efficiency of trimming. 8, don't allow should trim other qualified on the surface of the damage caused by improper operation (such as good surface scratch, cut, etc.).

Three, product storage and handling

1, product stacked on the pallet height should not exceed 1.2 mm, the number of the same specifications each building products must be the same, with winding mode finally. For small products in the turnover box, bottom in turnover box height should be 10 cm, turnover box the loading weight of not more than 25 kg.

OEM PVC Plastics Injection Molding

OEM PVC Plastics Injection Molding

The molded products’ material can be PP, PA, POM, ABS, PET, PC, PE, PA66+GF, PVC, TPE,PC+ABS and so on.

Mold base adopt the standard of LKM / HASCO /DME etc.

Mold material:P20, 738, 738H, 718, 718H, NAK80, 2344, 8407, SKD61, S136 etc.

Surface treatment of the mold: polishing and grain surface

Cavity type: single cavity or multiple cavities

Runner system: hot runner and cold runner

Dimension of the mold: can be made by customers designs

Mold life: 300,000 shots

Designed software: UG, CAD, PROE

Mold process: CNC / Cutting / Carved / EDM/Milling/Threading/Drilling, etc.

Arrangement type: I-section / Straight Body Mould

Project developing procedure:DFM—- 2D structure design—-3D design—–mold machined and processed—-testing –delivery

Injection molding is a manufacturing process for producing parts from both thermoplastic and thermosetting plastic materials. Materials is fed into a heated barrel, mixed and forced into a mold cavity where it cools and hardens to the configuration of the cavity.

Injection molding is widely used for manufacturing a variety of parts from the smallest component to entire body panels of cars.

It can be used from home appliance to electronic parts.

CNMOULDING Mold is competent in offering a wide scope of injection molding service to customers. We can meet your specific requirements in terms of material, size, complexity and volume.

The advantages of CNMOULDING injection molding are:

1. high molding speed adapted for mass production.

2. multiple choices of thermoplastic material, can provide a variety of useful properties.

3. large productivity for mold threading, undercutting, holes drilling

4. within 24 hours reply and timely reply

5. competitive price and reasonable designs

After injection products processing

I. For printing on the surface of the plastic products, printing or when the pattern, there are several methods.

1, stencil printing of this method is the most common and also the most one method; their generally suitable for flat or curvature of the small print.

2, the principle curved surface printing flexography printing ink is first placed within the text or logo engraved gravure, then copy the text or images onto a surface, the surface will re-use the text or pattern is transferred to the surface of the molded product, and finally through an ultraviolet light irradiation heat treatment or the like so that the ink is cured.

Surface printing process:

Skim A. molded products

B. molded product surface treatment (when necessary)

C. Printing

D. curing inks

E. applying post-processing such as excessive (if necessary)

Printing Process

A. gravure ink into the

B. scrape off the excess ink

C. extruded surfaces made ​​of ink

D. The surface of the ink transferred to the surface of the molded article

E. cleaning surfaces, layout (if necessary) and printing will start with version pattern or patterns printed on the plastic sheet or rubber roller, rubber roller will no longer sheet or pattern or pattern onto a surface of beer.

Pros: Several colors can be applied in a single operation.

Disadvantages: lower productivity and not get opacity strong prints, how to choose a suitable plastic sheet or rubber roller and oil and so on.

3, the use of hot stamping foil and the color pattern engraved or font of the hot mold, under controlled temperature and pressure, the surface of the emboss pattern of manufacturing color package or method of beer font member, which is mounted on the operation only by fixing the press hot mold foil color on regional products across the pressure needed to be applied.

Second, the paint surface treatment of plastic products (color) of the most commonly used techniques,

Can be divided into: A, general coloring, that this spray paint mostly by hand, do not have strong abrasion, easy to paint chips.

B, PU grade varnish this method is finished after the spray drying primer, then spray on the surface layer of PU varnish method to achieve abrasion and gloss. General home appliances or many everyday items is through PU surface treatment.

C, UV grade varnish finish this method after spray primer and then sprayed with a layer of surface UV varnish, gloss, feel, rubbing can achieve very good results. General phone mold products, communications products more die with such an approach.

Fourth, the use of electrolytic plating method is electroplating the metal or alloy is deposited on the surface, to form a uniform, dense and good adhesion of metals layers, called plating. Simple to understand, the physical and chemical changes, or in combination.

Purposes: a. Corrosion b. Protective decorative c. Anti-wear d. Electrical properties: According parts work requirements, providing conductive or insulating coating performance e. Process requirements

The surface of the article by electrolytic uniform, dense, with good metal or alloy deposited layer forming process, the process is relatively complicated process, but it has many advantages, such as many types of deposited metal can be obtained in various colors, with Compare similar process is relatively cheaper than in terms of prices.

overmolding

To meet the special needs of many plastic products, many plastic products are not made ​​from a plastic material, coupled with the appearance of plastic products and process requirements need to use two or more kinds of plastic materials in multiple injection molding method, called secondary injection molding.

Not only can the second injection devices filled with soft-touch surface, can also increase product functionality and value. In the past 10 years, the second injection technology has revolutionized the consumer goods aesthetic standards, design ideas and functional requirements. Medical device manufacturers are also aware of the potential advantages of this technology, expanding its application in the medical field. Secondary injection technology to create a "soft-touch surfaces" and famous, but it also has many other features, such as: ergonomic design, color appearance, brand identity and characteristics improvement. With this technology, you can increase the product's features (for example: noise, vibration, waterproof, anti-collision) and added value.

Second injection and common injection molding, injection molding and double injection sandwich, as are multi-material injection molding technology. The basic idea is the multi-material injection molding together two or more materials with different characteristics, thereby enhancing the product value

Plastic key features

Plastic key features:

① most plastic lightweight, chemically stable, will not rust;

② good impact resistance;

③ has good transparency and abrasion resistance; 

④ insulation, and low thermal conductivity;

⑤ general formability, good color, low processing costs;

⑥ most plastics poor heat resistance, thermal expansion, easy to burn;

⑦ poor dimensional stability, easily deformed;

⑧ most plastics poor low temperature resistance, low temperature brittle;

⑨ easy to aging;

⑩ certain plastics soluble in solvents.

Plastics can be divided into two types of thermosetting and thermoplastic, the former can not be re-shape to use, which can be repetitive.

Plastic polymer structure, there are two basic types:

The first is a linear structure, a polymer compound having such a structure is called a linear polymer compound;

The second body structure is a polymer compound having such a structure is called a polymer compound body. Some polymer having a branched chain, a branched polymer known as belonging to the linear structure. Although some polymer intermolecular crosslinking, but crosslinking less known network structure, body structure belongs.

Two different structures, showing two opposite properties. A linear structure (including the branched chain structure) of the polymer molecules due to the presence of a separate, and therefore, flexibility, plasticity, can be dissolved in a solvent, the heating can be melted, the hardness and brittleness of smaller features. Since there is no independent body structure of polymer macromolecules exist, so there is no elasticity and plasticity, can not dissolve and melt, only swelling, hardness and brittleness. Polymer plastic has the two structures, made ​​by the linear polymer is a thermoplastic plastic, a polymer made ​​by the body are thermosetting plastics.

Compared with other plastic materials

<1> resistance to chemical attack

<2> shiny, partially transparent or translucent

<3> is a good insulator mostly

Light <4> weight and sturdy

<5> can be processed easily mass-produced, inexpensive

<6> versatile, multi-utility, easy coloring, and some high-temperature plastic is also divided into pan with plastic and plastic, the main purpose is to define the breadth, such as PE, PP cheap, available in a variety of different types of production of the machine. Plastic is more expensive, but raw material stability

And physical properties are much better, in general, it also has two characteristics of rigidity and toughness.

Plastic advantages:

  1, most of the plastic of the corrosion resistance, strong acids, bases and the reaction is not.

2, low-cost plastic.

3, durable, waterproof, lightweight.

4, easy to be made ​​into different shapes of plastic.

5, is a good insulator.

6, the plastic can be used in the preparation of fuel oil and fuel gas, which can reduce oil consumption.

Disadvantages of plastic

1, the recycling of waste plastics, classification is very difficult and economically viable.

2, plastic is easy to burn, produce toxic gases when burned. Such as polystyrene produced during combustion of toluene, a small amount of this substance can cause blindness, vomiting and other symptoms of inhalation, PVC burning will produce toxic hydrogen chloride gas, in addition to burning, is a high temperature environment, will lead to plastics decompose toxic ingredients, such as benzene and so on.

3, the plastic product is made ​​of petroleum refining, petroleum resources are limited.

4, the plastic can not be natural decomposition.