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About Plastic Injection Molding

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By Author: Hortn Wayes
Total Articles: 5
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The plastics industry is one of the fastest growing major industries in the world. Every year there is an increase in the amount of plastics used in all types of products. A good example of this is the percent of plastics used in today's automobiles compared to 15 years ago.

The plastics injection molding field, at large, is volume oriented. Vendor sources, particularly mold makers and custom molders, are geared to long tool life and high volume production. Plastics equipment manufacturers, likewise, have concentrated almost exclusively on fully automatic, sophisticated injection molding machines whose economics lie in single runs of 100,000 parts or more and in multi-shift operations.

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Insert Molding

The continued rate of growth in the industry hinges on the development of improved and new thermoplastics with greater physical properties. This has opened the door to applications never thought ...
... possible before. These are emerging both as product innovations and as existing products converted from materials such as metal, glass, wood or paper to plastics for competitive and economic advantage.
Theory of injection molding
The theory of injection molding can be reduced to four simple individual steps: Plasticizing, Injection, Chilling, and Ejection. Each of those steps is distinct from the others and correct control of each is essential to the success of the total process.

Plastic mold

Plastic Molds

Plasticizing - describes the conversion of the polymer material from its normal hard granular form at room temperatures, to the liquid consistency necessary for injection at its correct melt temperature.
Injection - is the stage during which this melt is introduced into a mold to completely fill a cavity or cavities.
Chilling - is the action of removing heat from the melt to convert it from a liquid consistency back to its original rigid state. As the material cools, it also shrinks.
Ejection - is the removal of the cooled, molded part from the mold cavity and from any cores or inserts. Repetition of these basic steps in sequence is the process of injection molding.

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