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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Onboard protection: Tough battery enclosure CompositesWorld

Unique composite laminate provides crash protection for electric vehicle’s battery, occupants and first responders.

Leichtbau ist hybridbau CompositesWorld

Integrating multiple materials and functions for lightweight construction in the German automotive industry.

CAMX 2014 preview: LMG CompositesWorld

LMG (De Pere, Wis., USA) will feature its array of compression molding presses, plasticators for preparing long fiber-reinforced thermoplastics for compression molding, and resin transfer molding (RTM) presses.

CAMX 2014 preview: TMP CompositesWorld

Compression molding machinery manufacturer TMP (Piqua, Ohio, USA), a division of French Oil Mill Machinery Co., will feature its line of 15- to 2,000-ton presses for all types of composite and thermoplastic parts production.

Are LFRT composites key to auto adoption? CompositesWorld

Long carbon fiber-reinforced thermoplastics don't pack the punch of continuous carbon fiber, but they might help spread use of composites in automotive.

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