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Plastic Molding |
So What Exactly is Molding?
Molding is the method of producing different types of plastic products like PET bottles, PVC pipes, tanks, cylinders, storage vessels, plastic furniture, dustbins, bottles, toys, plastic sheets, plastic wares, etc. The molding process is very old and dates back to the early 18th century. Molding involves the shaping of pliable raw materials with the help of a rigid frame or model, which is called the pattern.
Various Stages of Molding Process
The Plastic Molding Process Employs Four Generic Stages:
- Heating
- Loading
- Cooling
- Unloading
Heating involves measuring the desired quantity of raw materials and subjecting them to high temperature so as to melt them. This process is followed by the loading stage, where the molten material is poured into the molds or patterns to shape them. Once the molds are properly filled and the molten material is evenly distributed in the inside walls of the mold, the cooling phase begins. The process of cooling is generally done by fan or in some cases by spraying water. This is the lengthiest process among all four. During this process the molten materials solidify and assume the desired shape. After the molds are cooled enough, the unloading phase begins, in which the moulds so formed are taken out by the operator. There are various types of plastic molding machines which are used to undertake all these molding stages.
Types of Plastic Molding Techniques
- Blow Molding
- Compression Molding
- Compaction Plus Sintering
- Extrusion Molding
- Expandable Bead Molding
- Rotomoulding
- Foam Molding
- Injection Molding
- Vertical Injection Moulding
- Pressure Plug Assist Molding
- Reaction Injection Molding
- Rotational Molding or Rotomoulding
- Transfer Molding
- Sintering
- Laminating
- Vacuum Plug Assist Molding
- Thermoforming
- Vacuum Forming - A Simplified Version of Thermoforming
Rotomoulding is also one of the types of plastic molding techniques which is used to produce various types of hollow plastic products using different types of rotomoulding machines.
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