The key link in plastic processing. Various forms of plastic products or part shapes are required. There are as many as 30 molding methods, which mainly depend on the type of plastic, the choice from the form and the shape and size of the product. Commonly used plastic processing methods are thermoplastic extrusion, injection molding, calendering, blow molding and thermoforming. Thermosetting plastic molding commonly used in plastic processing also uses transfer molding, injection molding, laminate molding and thermoforming. In addition, there are methods such as casting with liquid monomers or polymers as raw materials. Among these methods, extrusion and injection molding are used most frequently, and they are also the most basic methods.
Metal and wood are used to process plastics. Since the properties of plastics are different from those of metal and wood, poor thermal conductivity, low coefficient of thermal expansion, low modulus of elasticity, too much pressure on fixtures or tools, easy to cause deformation, and cutting heat are easy to melt. , And easy to adhere to the tool. Therefore, plastic machining, cutting tools and corresponding cutting speeds must adapt to the characteristics of plastics, and other common processing methods are sawing, cutting, punching, turning, planing, drilling, grinding, polishing, thread processing, etc. In addition, plastics can also be laser cut, stamped, and welded.
There are welding and adhesive methods for plastic processing. Welding is the use of hot air to weld electrodes, hot melt welding using heat, and welding methods such as high frequency welding, friction welding, induction welding, ultrasonic welding and laser welding. Adhesives are divided into solvents, resin solutions and hot melt adhesives.
Bonding, welding and mechanical connection methods enable the assembly of plastic parts into a complete product operation.

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