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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Cost-effective press CompositesWorld

Dieffenbacher offers a new press series for cost-effective molding of fiber-reinforced thermoplastics or thermosets with an energy-saving drive.

Core Molding Technologies acquires LFT specialist CPI Binani CompositesWorld

Compounder and molder Core Molding Technologies is paying $15 million for Minnesota-based CPI Binani, which manufactures direct long-fiber thermoplastic (D-LFT) products.

Dow Automotive expands VORAFORCE process development CompositesWorld

Dow's VORAFORCE epoxy, introduced in 2014, has been assessed for use with wet compression and shows potential for sub-60-second cycle times.

Cobham Composites: San Diego, CA, US CompositesWorld

An aerocomposites force since the dawn of the 1980s, this fabricator’s Big Idea is to move from quality control to in-situ process control on the strength of metrics powered by Big Data.

Looking for Lindberghs CompositesWorld

Every paradigm-shifting invention throughout human history has been met with skepticism. CW editor-in-chief Jeff Sloan says the composites industry has need of those willing to attempt what most believe impossible.

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