Introduction of Plastic Molding Method
Plastic forming process is an engineering technology, which involves various processes of transforming plastics into plastic products.
Injection molding
The principle of injection moulding is to add granular or powdery raw materials into the hopper of the injection machine. The raw materials are heated and melted into a flowing state. Driven by the screw or piston of the injection machine, the injection moulds are hardened and finalized through the injection nozzle and the pouring system of the moulds. The factors affecting the quality of injection molding are injection pressure, injection time and injection temperature.
Advantages：
1. Short forming cycle, high production efficiency and easy to realize automation
2. Plastic parts with complex shape, precise size and metal or non-metal inserts can be formed.
3. Good product quality
4. Wide scope of application
Disadvantages：
1. High Price of Injection Molding Equipment
2. The structure of injection moulds is complex.
3. High production cost, long production cycle and unsuitable for single piece and small batch production of plastic parts
Application:
In industrial products, injection moulding products include kitchen supplies (garbage cans, bowls, buckets, pots, tableware and various containers), the shell of electrical equipment (hair dryers, vacuum cleaners, food mixers, etc.), toys and games, various products of the automotive industry, parts of many other products, etc.
Extrusion Molding
Extrusion molding: mainly suitable for thermoplastic forming, but also for some of the better fluidity of thermosetting and reinforced plastic forming. The forming process is to use the rotating screw to extrude the heated and melted thermoplastic material from the die with the required cross-section shape, and then to finalize it by the finalizer, and then to solidify it through the cooler to become the product with the required cross-section.
Process characteristics：
1. Low equipment cost;
2. Simple operation, easy control of process and easy realization of continuous automation production.
3. High production efficiency, uniform and compact product quality;
4. Products or semi-finished products with various cross-section shapes can be formed by changing the die of the machine head.
Application:
In the field of product design, extrusion molding has strong applicability. The extrusion products include pipe, film, bar, monofilament, flat strip, net, hollow container, window, door frame, plate, cable cladding, monofilament and other profiles.
Blow molding
Blow moulding is a method that the melted thermoplastic material extruded from the extruder is clamped into the die, then air is injected into the material, the melted material expands under the action of air pressure, adheres to the cavity wall of the die, and finally solidifies to the desired product shape by cooling. Blow moulding can be divided into film blowing and hollow blowing.
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Advantages:
The product has uniform wall thickness, small weight tolerance, less post-processing and small waste edge angle. It is suitable for producing small refined products with large batches.
Application:
Film blow moulding is mainly used to make thin plastic moulds; hollow blow moulding is mainly used to make hollow plastic products (bottles, packaging barrels, spray kettles, fuel tanks, cans, toys, etc.)
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