Zone: Injection Molding
injection_molding.jpg Overview

Injection molding is a fast, high-volume, closed molding process that uses, most commonly, reinforced thermoplastics, such as nylon with chopped glass fiber. In the past 20 years, however, automated injection molding of BMC has taken over some markets previously held by thermoplastic and metal casting manufacturers. They include electrical and automotive components, appliance housings and motor housings, to name a few. The use of BMC must be justified by production volume because the cost of both molds and presses is relatively high. When injection molding BMC, a ram- or screw-type plunger forces a metered shot through a heated barrel and injects it (at 5,000 psi to 12,000 psi) into a heated mold, where the liquefied BMC flows easily along runner channels and into forming cavities. Heat build-up is controlled to minimize curing time. After cure and ejection, parts need only minimal finishing. Injection speeds are typically one to five seconds, and nearly 2,000 small parts can be produced per hour in a multiple-cavity mold. Long-fiber reinforced thermoplastics (LFRT) are materials with long (6.35 mm/0.25 inch or greater) fiber reinforcement and make up one of the fastest growing fabrication categories. Leading this expansion is one of the oldest forms, glass mat thermoplastic (GMT) and two of the segment’s newest: precompounded (pelletized) LFRTs (long-fiber reinforced thermoplastics), also known as LFTs, and inline compounded (ILC) or direct LFTs (D-LFTs).


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Most Recent Content: Injection Molding
Reinforced Thermoplastics: LFRT/GMT Roundup

Recent advancements in these reinforced thermoplastic technologies are expanding their performance, enabling new applications.
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Piper Plastics' Kyron MAX line of thermoplastics is injection moldable and is said to offer strength similar to prepregged composites, but in a faster, more consistent process.

Soluble plastic tooling cores CompositesWorld

Soluble plastic tooling cores reportedly offer lighter parts for aerospace and automotive applications.

RocTool, Ju Teng sign two new production licenses CompositesWorld

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SABIC expands long fiber-reinforced PP capacity in China CompositesWorld

SABIC's STAMAX long glass fiber-reinforced polypropylene (LGFPP) plant in Shanghai will add capacity in a fast-growing region and will support automotive applications in particular.

License to speed for composites manufacturing CompositesWorld

RocTool pushes composites into new markets with its high-speed induction heating technology for molding.

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