What are the main methods of plastic molding

Update:23-01-2021
Summary:

Injection molding It is a method in which the plastic m […]

Injection molding

It is a method in which the plastic material is first heated and melted in the heating barrel of the injection molding machine, and then the melt is pushed into the cavity of the closed mold by the reciprocating screw.

It can not only produce high-precision, high-quality products under high productivity,Bucket mould but also has a wide variety of plastics that can be processed, a large output (about 1/3 of the total amount of plastic) and a wide range of uses. Therefore, injection molding is an important part of plastic processing One of the molding methods

Extrusion molding

Extrusion is a method in which the plastic is continuously passed through the die in a flowing state by heating and pressing in an extruder.

It is generally used in the molding of plates, pipes, monofilaments, flat wires, films, wire and cable coatings, etc., with a wide range of uses and high yields. Therefore, it is one of the important molding methods in plastics.

Foam molding

It refers to the addition of suitable foaming agents to the foaming materials to produce porous or foamed products. The foamed products have low relative density, high specific strength, low raw material consumption, sound insulation, heat insulation and other volt points. There are PVC, PE and PS etc.

Products include: films, sheets, pipes, and profiles, etc. Foaming can be divided into chemical foaming and physical foaming.

Blow molding

Blowing (expanding film) molding (or hollow blow molding) refers to a molding method in which the hot thermoplastic parison or sheet in a closed mold is inflated into a hollow product by means of fluid (compressed air) pressure.

Plastic containers produced by this method. Such as various bottles, square, round or flat barrels, gasoline tanks, etc. have been widely used, and newly developed various industrial parts and daily products, such as double-walled box-shaped products, L-ring large drums. Stacking boards. Surfboards. Seat backs and desks, as well as front spoilers for automobiles, belt covers, instrument panels, air-conditioning vent pipes, etc., which have been applied in practice and processed materials From daily-use plastics to engineering plastics, blow molding has become one of the important molding methods in plastic processing.