PLastic |   Metal  |  Reaction

PRocess

This is the most common method of producing parts made of plastic. The process includes the injection or forcing of heated molten plastic into a mold which is in the form of the part to be made. Upon cooling and solidification, the part is ejected and the process continues. The injection molding process is capable of producing an infinite variety of part designs containing an equally infinite variety of details such as threads, springs, and hinges, and all in a single molding operation.  

The mold determines the part’s shape, acts as a heat sink to cool the part, is made to vent trapped air and gases, and, finally, ejects the finished part. Molds are most often made of special molding steel. Other mold materials include beryllium copper, stainless steel, aluminum, brass, and Kirksite. Molds are manufactured by machining, EDM, or casting.  

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PROCESS

MIM is a metal working process by which finely powdered metal is mixed with a measured amount of binder material to comprise a "feedstock" capable of being handled by plastic processing equipment through the injection molding process. The molding process allows dilated, complex parts to be shaped in a single step and in high volume. After molding, the powder-binder mixture is subjected to steps that remove the binder and sinter densify the powders. End products are small components used in various industries and applications. 

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PROCESS

RIM is similar to injection molding except thermosetting polymers are used, which requires a curing reaction to occur within the mold. Common items made via RIM include automotive bumpers, air spoilers and fenders.

RIM can produce strong, flexible, lightweight parts which can easily be painted. It also has the advantage of quick cycle times compared to typical vacuum cast materials. The bi-component mixture injected into the mold has much lower viscosity than molten thermoplastic polymers, therefore large, light weight, and thin walled items can be succesfully produced. This thinner mixture also requires less clamping forces, which leads to smaller equipment ultimately lower capital expenditures. 

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