Injection molding technology is widely used. I hope this article can give some inspiration to friends who want to understand this knowledge.——-Vito.
1. Plastic composition
In addition to polymers, various plastic additives (such as stabilizers, plasticizers, colorants, lubricants, enhancers and fillers, etc.) It is generally added to the raw materials used in plastic processing to improve the molding process and product properties or reduce product costs. After mixing with the polymer, it is evenly dispersed into a powder, also known as dry mix. Sometimes the powder needs to be plasticized and processed into pellets. Such powders and particles are collectively known as batching or moulding plastics.
2. Plastic molding
The key link of plastic processing. A product or blank of a desired shape is made from various forms of plastic (powder, pellet, solution, or dispersion). There are more than thirty molding methods. The choice depends on the type of plastic (thermoplastic or thermosetting), the initial form, and the shape and size of the product. The commonly used thermoplastic processing methods include extrusion, injection molding, calendering, blow molding and thermoforming. Typically, molding, transfer molding, and injection molding are used to process thermosetting plastics. Laminating, moulding and thermoforming form plastics on a flat surface. The plastic processing method can be used for rubber processing. In addition, there are liquid monomer or polymer as raw material casting method. In these methods, extrusion molding and injection molding are the most widely used and the most basic molding methods.
3. Joint of plastic parts
Methods of joining plastic parts include welding and bonding. Welding methods include hot rod welding, hot rod welding, high frequency welding, friction welding, induction welding, ultrasonic welding and so on. The bonding method can be divided into flux, resin solution and hot melt adhesive according to the adhesive used.
4. plastic parts assembly
The operation of assembling plastic parts into complete products by bonding, welding, and mechanical joining. For example PLASTIC profile is assembled through the steps such as saw, welding, drilling into plastic window frame, plastic door.
5. The processing
Borrowed from metal, wood, etc. We can make precise size or small amount of plastic products, can also be used as a molding auxiliary process, such as saw extrusion profiles. Because the performance of plastic is different from metal and wood, poor thermal conductivity, low coefficient of thermal expansion, low modulus of elasticity. Clamp or tool compression is too large, easy to cause deformation, cutting heat melting, stick on the tool. Therefore, when processing plastic, the tool used and the corresponding cutting speed to adapt to the characteristics of the plastic. Commonly used processing methods are sawing, cutting, punching, turning, planing, drilling, grinding, polishing and thread processing. In addition, plastic can be cut, punched and welded with lasers.
6. Surface modification
The purpose is to beautify the surface of plastic products, usually including: mechanical modification, that is, by filing, grinding, polishing and other processes to remove burrs and burrs on the products, modify the size; Finishing, including coating the surface of the product with paint, using solvents to make the surface bright, affixing patterned film to the surface of the product, etc. Coloring, including painting, printing and hot stamping; Metal plating, including vacuum plating, plating and electroless silver plating. Hot stamping is under heating and pressure, the hot stamping film on the color aluminum foil layer (or other pattern film layer) transferred to the workpiece. Many household appliances, building products, everyday items, etc. Are used in this way to obtain metallic luster or wood grain and other patterns.
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