1 and the characteristics of TPU extrusion:
(1) continuous production can produce tubes, plates, rods, profiles, films, cables and monofilaments of any length required.
(2) A single extruder with high production efficiency has high output, such as an extruder with a diameter of 65mm, with an annual output of more than 450t t of PVC film. ..
(3) Wide scope of application This processing method is widely used in the processing of rubber, plastics and fibers, especially plastic products. Almost all thermoplastics and some thermosetting plastics can be processed in this way.
2, the characteristics of injection molding:
Because it is made by machine, the output is large, so the price is low; If there are many styles, it is more troublesome to change the mold, the shoes are difficult to finalize the design, and the cold-bonded shoes are exquisite in workmanship, which is generally suitable for orders with single bottom styles.
Second, the overview of the two is different:
1.TPU extrusion overview: extrusion molding is also called extrusion in plastic processing. In the processing of non-rubber extruder, the die itself is extruded by the pressure of hydraulic press. It refers to a processing method that materials are heated and plasticized under the action of the barrel and screw of an extruder, pushed forward by the screw, and continuously passed through the die to make products or semi-finished products with various sections.
2. Overview of injection molding: Injection molding is a production and molding method of industrial products. Products usually adopt rubber injection molding and plastic injection molding. Injection molding can be divided into injection molding and die casting.
Third, the two types are different:
1.Type of TPU extrusion:
According to the different ways of plasticizing plastics, extrusion technology can be divided into dry method and wet method. Dry plasticization is to turn plastic into melt by heating. Plasticization and pressurization can be carried out in the same equipment, and the setting treatment is simply cooling. Wet plasticization is to fully soften the plastic with solvent, so plasticization and pressurization must be divided into two independent processes, and troublesome solvent must be used to remove the setting treatment, and solvent recovery must also be considered.
2. Types of injection molding:
(1) Rubber injection molding: Rubber injection molding is a production method in which the rubber compound is directly injected into the mold from the barrel for vulcanization. The advantages of rubber injection molding are: although it is intermittent operation, the molding cycle is short, the production efficiency is high, the blank preparation process is cancelled, the labor intensity is low, and the product quality is excellent.
(2) Plastic injection molding: Plastic injection molding is a method of plastic products, in which molten plastic is injected into the mold of plastic products by pressure and cooled to obtain various plastic parts. There are mechanical injection molding machines specially used for injection molding. At present, the most commonly used plastic is polystyrene.
(3) Injection molding: The shape obtained is often the final product, and no other processing is needed before installation or use as the final product. Many details, such as protrusions, ribs and threads, can be formed in one-step injection molding operation.
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