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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SPE names winners of 2015 Automotive Innovation Awards Competition CompositesWorld

Continental Structural Plastics' TCA Ultra Lite sheet molding compound (SMC) for composite body panels was the Materials category and Grand Award winner.

Wisconsin Thermoset Molding and Rose Polymer Composites renamed to Cornerstone Composites CompositesWorld

The two Milwaukee composite manufacturers announced their merger earlier this year.

Long fiber injection molding system CompositesWorld

KraussMaffei (Munich, Germany) has developed FiberForm, a process for injection molding long fibers in polypropylene (PP) in quantities sufficient to reduce part weight by as much as 50% compared to components made with a short fiber-reinforced polyamide.

CAMX 2015 preview: Wabash MPI and Carver Inc. CompositesWorld

Wabash MPI (Wabash, IN, US) and Carver Inc. (also Wabash, IN) will feature their standard and custom composites molding presses for manufacturing and laboratory applications.

CAMX 2015 preview: Wickert Hydraulic Presses CompositesWorld

Wickert (Landau, Germany) is featuring its line of high-temperature contact heating presses that support processing temperatures of up to 425°C.

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