Compression Molding
Compression molding is another manufacturing process used to create plastic parts, but it differs from injection molding in the way the material is introduced into the mold. Here’s how compression molding works:
- Material Preparation: The process starts with a pre-measured amount of raw material, typically in the form of a plastic sheet, powder, or preform (often thermosetting plastic or rubber).
- Mold Heating: The mold (usually made up of two halves) is preheated to a specific temperature.
- Material Placement: The raw material is placed into the bottom half of the mold, which is usually open.
- Compression: The mold is closed, and pressure is applied. The heat causes the material to soften, and the applied pressure forces the material to flow and take the shape of the mold cavity.
- Curing: During this step, the thermosetting plastic or rubber undergoes a chemical reaction (curing or vulcanization), which hardens the material and gives it its final shape and properties.
- Mold Opening and Ejection: After the material has cooled and cured, the mold is opened, and the finished part is ejected.
Compression molding is typically used for products made of thermosetting plastics, rubber, and certain composites. It is ideal for making larger parts with complex shapes, and it’s often used in industries like automotive, electrical, and appliance manufacturing. The process is slower compared to injection molding but is often more cost-effective for low- to medium-volume production of large parts.
Not sure what type molding you are needing, reach out to us at sales@chemplastinc.com or call us at 281-208-2585.