Zone: Compression Molding
h-beamandmachine_checked.jpg Overview

Compression molding is a high-volume process that employs expensive but very durable metal dies. It is an appropriate choice when production quantities exceed 10,000 parts. As many as 200,000 parts can be turned out on a set of forged steel dies, using sheet molding compound (SMC), a composite sheet material made by sandwiching chopped fiberglass between two layers of thick resin paste. To form the sheet, the resin paste transfers from a metering device onto a moving film carrier. Chopped glass fibers drop onto the paste, and a second film carrier places another layer of resin on top of the glass. Rollers compact the sheet to saturate the glass with resin and squeeze out entrapped air. The resin paste initially is the consistency of molasses (between 20,000 cps and 40,000 cps); over the next three to five days, its viscosity increases and the sheet becomes leather-like (about 25 million cps), ideal for molding.


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Most Recent Content: Compression Molding
SMC Flexes Muscles in Other Markets

Often identified with automotive body applications, sheet molding compound shows growing promise in a variety of other temperature- and weather-resistant applications.
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Pinette completes acceptance of composites manufacturing platform CompositesWorld

Pinette Emidecau Industries has supplied a platform to support the development of thermoplastic and thermoset composite materials using press molding technologies, including HP-RTM.

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Gurit wins multi-year automotive supply contract CompositesWorld

Gurit has been selected to supply carbon fiber composite automotive body panels to an unidentified OEM at a total contract value of more than $34 million.

The markets: Electronics (2015) CompositesWorld

Glass fiber/epoxy laminates have been the foundational structural substrate in printed circuit boards (PCBs) for decades, but its dominance is currently under challenge.

SOURCEBOOK 2015: The online edition CompositesWorld

Welcome to the online SOURCEBOOK, the searchable, updatable, Internet-based counterpart to CompositesWorld's annually published print SOURCEBOOK.

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