plastic forming
technology
Quick Summary
Plastic forming is the process of converting raw plastic materials into usable products. This typically involves melting, shaping, and solidifying the plastic.
Forming Methods
- Thermoforming and Cold Molding: Sheets of thermoplastic are heated above their glass transition temperature (Tg) or melting point (Tm) and then shaped, often using vacuum, into a mold. Some thermoplastics can also be formed without heating by applying sufficient pressure, a process known as cold molding.1
- Rotational Molding: A mold is partially filled with liquid or powder, rotated while heated, and then cooled to create hollow plastic articles like toys.2
- Casting and Dipping: Liquid plastics, such as PVC suspensions (plastisols), can be poured into molds (casting) or used to coat objects dipped into them. Heating causes these liquids to form a solid, homogeneous gel. Thermoset materials can also be cast after mixing with initiators and heating in a mold.3
These methods transform plastic pellets or films into various items, from food containers to toys and even gloves.123
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