Plastic

GIF for injection molding.

2018-12-06


 

GIF for a variety of plastic mold at a glance.

 

 

1.Injection molding

 

Injection molding is a manufacturing process for producing parts by injecting material into a mold. The main method used for processing plastic is injection molding. With this process, the plastic is placed into a hopper. The hopper then feeds the plastic into a heated injection unit, where it is pushed through a long chamber with a reciprocating screw. Here, it is softened to a fluid state. A nozzle is located at the end of the chamber. The fluid plastic is forced through the nozzle into a cold, closed mold. The halves of the mold are held shut with a system of clamps. When the plastic is cooled and solidified, the halves open and the finished product is ejected from the press.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

 

2. Extrusion molding

 

Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed through a die of the desired cross-section. The two main advantages of this process over other manufacturing processes are its ability to create very complex cross-sections, and to work materials that are brittle, because the material only encounterscompressive and shear stresses. It also forms parts with an excellent surface finish.
 

 

3. Blow molding

 

Stretch Blow Molding process is mainly used when the plastic product that needs to be created should be hollow. A molten tube is created with blow molding byusing compressed air.Variations of blow molding include injection, injection-stretch, and extrusion blow molding.

 

 

 

4. Gas assisted injection molding

 

In this process, the pressurized gas is injected into the mold cavity through a runner or other designed gas channels during the polymer filling phase. The gas cores out a network of hollow channels and drives the polymer melt to form a part. This process is primarily developed for hollow plastics, thin wall structure with ribs, separate internal void space or channels, etc.

 

 

 

 

 

5. Vacuum forming

 

Vacuum forming is a simplified version of thermoforming, whereby a sheet of plastic is heated to a forming temperature, stretched onto a convex, or into a concave, single-surface mold, and forced against the mold by a vacuum (suction of air).

 

 

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