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.