China injection molding and plastic mold making industry hard

From China’s income situation difficult to see Chinese private enterprises, including ours plastic injection molding industry,The U.S. has 70% of the injection molding industry to move back, and if China plastic mold injection molding industry to continue to survive, to break the monopoly of state-owned enterprises is inevitable.

Chinese household financial investigation and Research Center data show that “the financial industry, utilities, real estate is the highest level of annual wage income of three industries, other industries typically 1.9 to 2.6 times.” Investigation of the center come from different ownership enterprises wages of view, state-owned enterprises, the average wage level of 54,000, only 29,000 private enterprises, state-owned enterprises is the private sector average wage level is about 1.9 times. The average wage income of foreign companies is as high as 86,000.

“State-owned monopoly industries due to hold the telecommunications, electricity, energy, high-value resources, it was easier profitable addition to pay state taxes, as well as considerable profit retention by allowing for the issuance of employee benefits or develop shopping malls, resorts, hotels and other sideline; The relative crowding together in the competitive private manufacturing, consumer goods, foreign trade and other fields. junior staff the income gap between the two conservative estimate of about 2 times. “Zou Wenjiang said.

Analysis of state-owned enterprises pay system is not difficult to find, in addition to employees of state enterprises fundamental wage income, but also includes wages of hidden income, such as a variety of bonuses, subsidies, insurance, prepaid cards, in-kind and other benefits. Industry insiders estimate that this part of the income of employees of state enterprises accounts for about half of total revenue.

Chinese household financial investigation and research center director, dean of Southwest University of Finance and Economics plow willing to accept new financial reporter in an interview that, according to various sources of income contribution to income inequality perspective, wage income gap is caused by China’s current income uneven distribution of one of the main income gap on the overall contribution rate of 40 percent. Followed by the industrial and commercial income disparities, income up 20% of households with an average income of 22,000 yuan business, the average household income of the lowest 20% Business operating income of only 200 yuan. Typically, the main source of income of low-income households or agricultural production, 20% of the lowest-income households, accounting for nearly 50% of agricultural income, wage income and business income accounted for only 13% and 5%. This reflects the current low rate of return of agricultural production reality.

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About plastic injection mold

Injection molding is a process of shaping plastic by melting it and injecting it into a predesigned mold. The process was first designed in the 1930s and was originally based on metal die casting designs. It offers many advantages to alternative manufacturing methods, including minimal losses from scrap (since scrap pieces can be melted and recycled), and minimal finishing requirements. This process differs from metal die casting in that molten metals can simply be poured; plastic resins must be injected with force.

The process uses large injection molding machines, which advance the resins through six major processes to produce everything from computer parts to plastic Halloween spiders. Although this machine is a complex piece of equipment, it consists of two basic elements: the injection unit and the clamping unit.

The process starts with a mold, which is clamped under pressure to accommodate the injection and cooling process. Then, pelletized resins are fed into the machine, followed by the appropriate colorants. The resins then fall into an injection barrel, where they are heated to amelting point, and then injected into the mold through either a screw or ramming device.

Then comes the dwelling phase, in which the molten plastics are contained within the mold, and hydraulic or mechanical pressure is applied to make sure all of the cavities within the mold are filled. The plastics are then allowed to cool within the mold, which is then opened by separating the two halves of the mold. In the final step, the plastic part is ejected from the mold with ejecting pins. The completed part may contain extraneous bits called runners, which are trimmed off and recycled. The entire process is cyclical, with cycle times ranging from between ten and 100 seconds, depending on the required cooling time.

The injection moldingprocess requires some complex calculations. Every different type ofresin has a shrinkage value that must be factored in, and the mold must compensate for it. If this value is not precisely determined, the final product will be incorrectly sized or may contain flaws. Typically, this is compensated for by first filling the mold with resin, holding it under pressure, and then adding more resin to compensate for contraction. Other complications may include burned parts resulting from the melt temperature being set too high, warpage resulting from an uneven surface temperature, or incomplete filling due to a too slow of an injection stroke.

Injection molds themselves can be surprisingly expensive, sometimes upward of $100,000 US Dollars (USD). If the desired part quantity is great enough, however, the mold cost becomes relatively insignificant, and the resulting plastic parts are very reasonably priced. Some molds are made with more than one cavity; these multicavity molds cost more than their single cavity counterparts, but due to increased production efficiency, the cost per part is minimized.

This method of molding can be used with a variety of plastic resins. The most popular resins for this type of molding include polypropylene (PP), polyethylene (PE), and ABS. Each has its own set of advantages and disadvantages, and they are chosen based on the desired characteristics of the final part.

Introduction to Injection Molding

Injection molding is considered one of the most common plastic part manufacturing processes. It can be used for producing parts from both thermoplastic and thermoset polymers. The process usually begins with taking the polymers in the form of pellets or granules and heating them to the molten state. The melt is then injected/forced into a chamber formed by a split-die mold. The melt remains in the mold and is either chilled down to solidify (thermoplastics) or heated up to cure (thermosets). The mold is then opened and the part is ejected.

A Typical Injection Molding Process

In spite of the relatively expensive tooling cost, injection molding remains the most popular manufacturing process for plastic materials in mass production, thanks to its low operational cost, high throughput, and the flexibility to make parts with complex shapes.

Polymers commonly used for injection molding include

• Polystyrene (PS)
• Acrylonitrile Butadiene Styrene (ABS)
• Polyamide (PA)
• Polypropylene (PP)
• Polyethylene (PE)
• Polyvinylchloride (PVC)

Other short fiber reinforced plastics