Liquid Compression Molding

Posted on June 16th, 2014 by admin

Liquid Compression molding is a method suitable for molding complex, high-strength fiberglass reinforcements. In LCM, molding material is first placed in an open, heated mold cavity. Liquid resins are catalyzed then poured over the glass load prior to closing the mold. The mold is closed with a top force and pressure is applied to force the material into contact with all mold areas, while heat and pressure are maintained until the molding material has cured. Liquid resins are catalyzed then poured over the glass load prior to closing the mold.

SWC’s expertise includes Liquid Compression Molding which helps us produces innovative and cost-effective solutions for our OEM customers. SWC builds LCM parts for

Fan Shrouds
Ag/Ind. Heavy Equipment Driver Cabin Floors

Advanced composite thermoplastics can also be compression molded with unidirectional tapes, woven fabrics, randomly oriented fiber mat or chopped strand. The advantage of compression molding is its ability to mold large, fairly intricate parts at lower cost than RTM or injection molding. Materials that are typically manufactured through compression molding include polyester fiberglass resin systems and grades of PEEK.

General Design Guidelines

Minimum Radius6 mm (0.250 in)
Minimum Draft3 degrees
Minimum Thickness3 mm (0.125 in)
Maximum Thickness13 mm (0.50 in) without core
At least 18 mm with core
Typical Reinforcement Loading30 %
Density1578 kg/m3 (.060 lb./in3)
Die Lock (Reverse Draft)No

Selection Guidelines

Moderate to high production volumes – 1,000 – 100,000 parts/year
Consistent controlled thickness & cross sectional tolerances of +/- .5mm
Large structurally reinforced parts requiring two-sided finish
Utilization of preforms and “sandwich” structure
Excellent for structural and non-structural parts with non-finished surfaces
Pressures allow low cost epoxy tooling to be utilized for lower end of volume range
Sintex - Wausaukee Composites

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