Types of Plastic Molding

Plastic Molding

There are seven common types of plastic molding, which sport different product areas. Below we describe the characteristics of each type of plastic molding:

Injection Molding

Injection molding is a method in which the plastic is placed in the heated barrel of an injection molding machine to be heated and melted, and then the reciprocating screw pushes the melt into the mold cavity of a closed mold.


Injection molding is one of the most important molding methods for plastics processing because it can not only produce high-precision, high-quality products with high efficiency, but also process a wide variety of plastic products with large output (about 1/3 of the total amount of plastics) and a wide range of uses.


Extrusion molding

Extrusion molding is in the extruder by heating, pressure and make the plastic to flow state continuously through the mouth molding method. Generally used for sheet. Pipe. Monofilament. Flat wire. Film. Wire and cable wrapping, etc. Wide range of applications. High output. Therefore, it is one of the important molding methods in plastics.


Foam molding

Foam molding refers to the addition of appropriate blowing agent in the foam material, resulting in porous or foam products processing methods. Foam products have low density, high strength, low raw material consumption, sound insulation, heat insulation and other characteristics, foaming materials such as PVC, PE and PS.

Products are: film, sheet, pipe, and profile. Foam can be divided into chemical foam and physical foam.


Blow Molding

Blow molding is a molding method in which hot plastic plastic is blown into a hollow product by the pressure of compressed air in a closed mold.

This method produces plastic containers. Bottles, square, round or flat drums, gasoline tanks, industrial parts and household products such as double-walled boxes, circular drums. Palletizing boards. Surfboards. Seat backs and school desks, and front spoilers for automobiles. Belt covers. Instrument panels. Air conditioning ducts, etc. Nowadays, blow molding has become one of the most important molding methods in plastics processing.


The basic steps of the blow molding process are

1.Melting the material.

2.Form the molten resin into a tube or parison.

3.Blow mold the hollow parison melt sealing.

4.Blow up the molded parison.

5.Cool the blow molded product.

6.Remove the product from the mold.



Injection Blow Molding

Injection blow molding is a blow molding method. The plastic is first made into a bottomed blank by injection molding, and then it is moved to the blow mold and blown into a hollow product. This method can be used to produce products for daily necessities. Cosmetics. Pharmaceuticals. Food containers. But its volume should not exceed 1L. Commonly used plastics are polyethylene. Commonly used plastics are polyethylene, polystyrene and polyvinyl chloride.


Extrusion blow molding

Extrusion blow molding is a blow molding method. Different from injection blow molding. Its parison is made by extrusion method.


Stretch Blow Molding

Stretch blow molding is a blow molding method. It is made by extrusion. The parison is made by injection molding. The parison is then heated to stretching temperature. It is stretched longitudinally by internal (e.g. mandrel) or external (e.g. fixture) mechanical force. At the same time or later by compressed air blowing and transverse stretching.


These plastic molding methods have been used in the daily products, in your choice of plastic production suppliers need to take into account the product molding methods, cost, quality requirements. If you encounter any problems in the process of plastic molding, please feel free to consult grandshine engineers.

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