SMC - Sheet Moulding Compounds
Sheet Moulding Compound (SMC) is primarily used in compression moulding. SMC's are suitable for molding a wide range of parts from very small to very large, from flat panel to very complex shapes. The SMC manufacturing process allows glass percentages from 15% to 65% to be incorporated into the matrix. The glass length can also be increased up to 2" vs. a BMC that may range between 1/8" and 1/2". SMC also offers the possibility of continuous strand or matte. SMC's come in a wide range of colors and can often be color matched. SMCs have excellent physical, thermal, flame and chemical resistance properties.
Basically, SMC is a mixture of polymer resin, inert fillers, fiber reinforcement, catalysts, pigments, stabilizers, release agents, and thickeners. Manufacturing of SMC is a continuous in-line process. The base components of liquids and solids (paste) are bulk mixed and continuously metered onto to the surface of a carrier/barrier film, coating the film surface. Two mirror imaged metering stations operate simultaneously. One of the paste-coated carrier films are then layered with chopped fibers. The 2 carrier webs, paste & fiber are then brought together in the compaction section, where the sandwich-like layered components are kneaded into one homogenous compound sheet. The sheet is then fan folded into a container and stored in a controlled environment where maturation takes place, on its way to a specified viscosity.
- Press Machine
Compression Molding Process
- Cutting SMC Charge
- SMC Placement in the hot mould
- Compression moulding
- Removal, deflashing and fixing in cooling device if needed