Plastic forming is an engineering technology, which involves various processes to transform plastics into plastic products.
The principle of injection molding is to add granular or powdery raw materials into the hopper of the injection machine. After heating and melting, the raw materials are in a flowing state. Driven by the screw or piston of the injection machine, they enter the mold cavity through the pouring system of the nozzle and the mold, and harden and finalize the mold cavity.Factors affecting the quality of injection molding: injection pressure, injection time, injection temperature.
Advantages: 1. Short molding cycle, high production efficiency, easy to achieve automation;2, can shape complex shape, accurate size, with metal or non-metal embedded plastic parts;3. Stable product quality;4. Wide range of adaptation.
Disadvantages: 1. High price of injection molding equipment;2. Complex injection mold structure;3. High production cost, long production cycle, not suitable for single small batch plastic parts production.
Application: in industrial products, injection molding products are: 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, many other products parts.
Extrusion molding: also known as extrusion molding, mainly suitable for thermoplastic molding, but also suitable for part of the better flow thermosetting and reinforced plastic molding.The forming process is to use the rotating screw rod to extrude the thermoplastic raw material heated and melted from the head with the required section shape, and then the former is shaped by the former and then hardened and solidified by the latter through the cooler to become the product with the required section.
Low equipment cost;2. Simple operation, easy control of process, easy to realize continuous automatic production;3. High production efficiency;Product quality uniform, dense;4, By changing the head of the die can be shaped into a variety of cross-section shape of products or semi-finished products.Application: in the field of product design, extrusion molding has strong applicability.The extruded products include pipe, film, bar, single wire, flat belt, net, hollow container, window, door frame, plate, cable claddings, single wire and other special shaped materials.
Blow molding: it is the method that the molten thermoplastic raw material extruded from the extruder is clamped into the mold, and then the air is blown into the raw material. The molten raw material expands under the action of air pressure and sticks to the wall surface of the mold cavity, and finally cools and solidifies into the required product shape.Blow molding is divided into film blow molding and blow molding two kinds: film blowing: film blowing molten plastic from extruder head mouth mold in the circular gap in cylindrical thin tube extrusion, at the same time from the central hole to the thin tube cavity into the compressed air blowing, blowing thin tube bulge into a larger diameter tubular membrane (commonly known as the bubble tube), cooling after coiling.Hollow blow molding: hollow blow molding is a secondary molding technology that makes the rubber-like shape blank closed in the mold cavity into hollow products with the help of gas pressure. It is a method to produce hollow plastic products.Hollow blow molding according to the mold blank manufacturing methods are different, extrusion blow molding, injection blow molding, stretch blow molding.
Advantages: uniform wall thickness, small weight tolerance, less post-processing, small waste side Angle;Suitable for the production of large quantities of small refined products.
Application: film blowing is mainly used in the manufacture of plastic thin mold;Hollow blow molding is mainly used to produce hollow plastic products (bottles, packaging barrels, watering cans, fuel tanks, cans, toys, etc.).
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