plastic forming types

A injection molding: it is a method that the plastic material is 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 and high-quality products under high productivity, but also can process many kinds of plastics, with large output (about 1 / 3 of the total amount of plastics) and wide use. Therefore, injection molding is one of the important molding methods in plastic processing.
B extrusion molding: extrusion is in the extruder by heating, pressure and so that the plastic flow through the mold method. It is generally used for plates. Pipe. Monofilament. Flat filament. film. The molding of wire and cable covering has a wide range of applications. High yield. Therefore, it is one of the most important molding methods in plastic addition.
C foam molding: it refers to the way of adding appropriate foaming agent into the foaming material to produce porous or foamed products. The foaming products have low relative density, high specific strength, small amount of raw materials and other potential points of sound insulation and heat insulation. The foaming materials include PVC, PE and PS, etc. Products are: film, plate, pipe, and profile. Foaming can be divided into chemical foaming and physical foaming.
D blow molding: blowing (expanding film) molding (or hollow blow molding) refers to a molding method in which the hot thermoplastic parison or sheet in the closed mold is inflated into hollow products with the help of fluid (compressed air) pressure. Plastic containers produced in this way. For example, all kinds of bottles, square, round or flat barrels, gasoline tanks, etc. have been widely used. Palletizing. Surf board. Seat backs and desks, and front baffles for cars. Belt cover. Dashboard. Air conditioning ventilation pipe has been applied in practice, and the processed materials have developed from daily plastics to engineering plastics. Now blow molding has become one of the important molding methods in plastic processing.
But the basic steps of blow molding process are as follows: 1. 2. The molten resin is formed into a tube or parison. 3. Melt and seal the blank in the blow molding mold. 4. Blow the blank in the mold. 5. Cooling blow molding products. 6. Take the product out of the mold. 7. Trimming.
E injection blow molding: injection blow molding is a blow molding method. First, the plastic is made into a bottomed parison by injection molding, and then it is moved into a blow molding mold to blow into a hollow product. This method can be used to produce daily necessities. Cosmetics. Medicine. A container for food, etc. But its volume should not exceed 1L. The commonly used plastics are polyethylene. Polystyrene and PVC.
F extrusion blow molding: extrusion blow molding is a blow molding method. Unlike injection blow molding. Its parison is made by extrusion.
G stretch blow molding: stretch blow molding is a blow molding method. It's extrusion. The parison is made by injection molding. The parison is then heated to the drawing temperature. Longitudinal stretching by mechanical force from inside (such as mandrel) or external (such as clamp). At the same time or later, it is inflated by compressed air and stretched horizontally.