Topic Content:
- Processing of Plastic
- Injection molding, compression molding, extrusion molding, calendering.
Plastics are polymers obtained from petroleum by-products such as ethane and phenol. These raw materials are generally referred to as resins or monomers.
When a great number of monomers are combined through chemical reactions, polymers are formed. This polymer is referred to as plastic.
The process of combining monomers is known as polymerization. The major component of plastic is resin. Resin is a material that softens, flows, and can be moulded.
The two types of plastics are thermoplastics and thermosets.
Thermosets are plastics which on heating, melt into a soft form which can not be remoulded.
Thermoplastics are plastics which when heated, melt into a soft form that can be remoulded.
There are many ways of making plastics from molten materials. The choice of method depends on the plastic product to be made and its use.
Some methods of production of plastic include:
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