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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Move over honeycomb, thermoplastic sandwich is commercialized as DYNATECH CompositesWorld

PEI foam core/skin sandwich panels claim to save up to 40 percent weight and 30 percent cost in rail and aircraft interiors vs. honeycomb.

Processing within the PUR cure window CompositesWorld

Composite Spray Molding enables volume production of fiber-reinforced polyurethane sandwich structures for auto interiors. Are Class A exterior parts next?

Move over steel — Aluminum is now the target CompositesWorld

Dale Brosius, a consultant and president of Quickstep Composites (Dayton, Ohio), observes that chasing aluminum as a competitor is a much easier task than chasing steel — if the composites industry can meet cost and volume requirements.

Business and busy-ness CompositesWorld

CT editor-in-chief Jeff Sloan returns for JEC Europe 2014 in Paris with observations about several intriguing composites industry trends.

Schuler press installed at Aachen CompositesWorld

The press manufacturer is collaborating with other Aachen AZL partners on fast production of lightweight composite parts for the automotive industry.

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