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.


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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AVANCO: Driving the industrialization of CFRP structures CompositesWorld

The AVANCO Group is producing high-quality CFRP parts into a wide array of applications from six production facilities in Germany and the US.

Teijin (quietly) announces plans for Sereebo rollout in automotive CompositesWorld

Somewhat buried in its Integrated Report 2015, Teijin says the company's thermoplastic-based, high-speed molding process, dubbed Sereebo, is ready for commercialization, necessitating in the process a new Teijin manufacturing facility somewhere in the U.S.

PPG-authored paper wins Best Paper Award at ACCE CompositesWorld

Dr. Jacob Anderson's paper on the effects of processing techniques on glass fiber-reinforced thermoplastics will be presented at the SPE Automotive Composites Conference & Exhibition (ACCE) on Sept. 10.

VOC reduction strategies for LFRT composites CompositesWorld

Additives supplier seeks novel methods to limit VOC emissions from long-fiber-reinforced thermoplastics.

Rapid tooling breakthrough: Fused particle technology CompositesWorld

Super-fast, inexpensive tooling is ideal for low-pressure molding processes and low production volumes.

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