Plastic molding
Plastic molding
Plastic molding is a general term for various processes that convert synthetic resin or plastic into plastic products and is a large production department in the plastics industry. Plastic processing generally includes materials, molding, machining, joining, modification and assembly. The last four processes are carried out after the plastic has been formed into finished products or semi-finished products, also known as plastic secondary processing.
Plastic products exist in all aspects of daily life and are in great demand in various industries. Plastic molding technology is the main step that affects plastic products. Different plastic products have certain differences in their final production form, performance and input cost due to different formulas, different raw materials and different processing techniques. Plastic molding processing is a key part of plastic production. The national government and relevant departments attach great importance to the supervision of the implementation of plastic molding processing, and strengthen investment in research on plastic molding processing, aiming to promote better progress in the plastic molding processing industry.
Plastic processing is developed with the development of synthetic resin, and it and the development of plastic machinery promote each other. Many plastic processing technologies learn from rubber, metal and ceramic processing. The history of plastic processing can be traced back to the 1890s. After the appearance of celluloid, because of its flammability, it can only be made into blocks by molding, and then machined into sheets, which can be processed by thermoforming. This is the earliest plastic processing. Casting molding was successfully researched with the advent of phenolic resin; injection molding began in the 1920s for processing cellulose acetate and polystyrene. In the mid-1930s, soft polyvinyl chloride extrusion molding was successfully developed, and the single-screw extruder used for plastics was developed accordingly; the twin-screw extruder was also put into production in 1938. In the early 1940s, polyurethane foam plastic was produced, and blow molding technology was used to produce polyethylene hollow products. In 1952, the reciprocating screw injection machine came out, which brought the injection molding technology into a new stage. In the 1960s and 1970s, the newly developed plastic processing technologies include various new molding methods for reinforced plastics, such as winding, pultrusion, sheet molding, reaction injection molding, structural foam molding, profile extrusion molding, sheet molding, solid phase molding, co-extrusion, co-injection, etc. In the 1980s, plastic processing was developing in the direction of high efficiency, high speed, high precision, energy saving, large-scale, ultra-small and ultra-thin. Computer technology entered this field, making the entire plastic processing technology to a new level.
There are five main steps in processing the plastic product, namely selecting materials, formula design, mixing refining, granulation and molding. There are certain differences in the composition of plastic products. There are great differences in the production process of different types of plastics. In the process of plastic molding, the choice of raw materials for plastics, plastic manufacturing processes, and plastic molding technologies will have an important impact on the quality of the final plastic product. Under the influence of different temperatures or different external forces, to adapt to external changes, the plastic polymer chain will change from its original shape to another form. However, this change in the plastic polymer chain does not happen in a short time, but slowly changes over time. The raw materials and auxiliary materials used in the molding and processing of plastic products are synthetic resins and other additives. Among them, synthetic resins are the main constituent raw materials, and their main function is bonding. Usually, the proportion of plastic products is as low as 30%, and the highest can reach 100%, which is the main factor affecting the basic performance of plastic products. Additives are special ingredients added to make plastic products have certain characteristics. Generally, additives will not affect the basic performance of plastic products.
Plastic molding is a general term for various processes that convert synthetic resin or plastic into plastic products and is a large production department in the plastics industry. Plastic processing generally includes materials, molding, machining, joining, modification and assembly. The last four processes are carried out after the plastic has been formed into finished products or semi-finished products, also known as plastic secondary processing.
Plastic products exist in all aspects of daily life and are in great demand in various industries. Plastic molding technology is the main step that affects plastic products. Different plastic products have certain differences in their final production form, performance and input cost due to different formulas, different raw materials and different processing techniques. Plastic molding processing is a key part of plastic production. The national government and relevant departments attach great importance to the supervision of the implementation of plastic molding processing, and strengthen investment in research on plastic molding processing, aiming to promote better progress in the plastic molding processing industry.
Plastic processing is developed with the development of synthetic resin, and it and the development of plastic machinery promote each other. Many plastic processing technologies learn from rubber, metal and ceramic processing. The history of plastic processing can be traced back to the 1890s. After the appearance of celluloid, because of its flammability, it can only be made into blocks by molding, and then machined into sheets, which can be processed by thermoforming. This is the earliest plastic processing. Casting molding was successfully researched with the advent of phenolic resin; injection molding began in the 1920s for processing cellulose acetate and polystyrene. In the mid-1930s, soft polyvinyl chloride extrusion molding was successfully developed, and the single-screw extruder used for plastics was developed accordingly; the twin-screw extruder was also put into production in 1938. In the early 1940s, polyurethane foam plastic was produced, and blow molding technology was used to produce polyethylene hollow products. In 1952, the reciprocating screw injection machine came out, which brought the injection molding technology into a new stage. In the 1960s and 1970s, the newly developed plastic processing technologies include various new molding methods for reinforced plastics, such as winding, pultrusion, sheet molding, reaction injection molding, structural foam molding, profile extrusion molding, sheet molding, solid phase molding, co-extrusion, co-injection, etc. In the 1980s, plastic processing was developing in the direction of high efficiency, high speed, high precision, energy saving, large-scale, ultra-small and ultra-thin. Computer technology entered this field, making the entire plastic processing technology to a new level.
There are five main steps in processing the plastic product, namely selecting materials, formula design, mixing refining, granulation and molding. There are certain differences in the composition of plastic products. There are great differences in the production process of different types of plastics. In the process of plastic molding, the choice of raw materials for plastics, plastic manufacturing processes, and plastic molding technologies will have an important impact on the quality of the final plastic product. Under the influence of different temperatures or different external forces, to adapt to external changes, the plastic polymer chain will change from its original shape to another form. However, this change in the plastic polymer chain does not happen in a short time, but slowly changes over time. The raw materials and auxiliary materials used in the molding and processing of plastic products are synthetic resins and other additives. Among them, synthetic resins are the main constituent raw materials, and their main function is bonding. Usually, the proportion of plastic products is as low as 30%, and the highest can reach 100%, which is the main factor affecting the basic performance of plastic products. Additives are special ingredients added to make plastic products have certain characteristics. Generally, additives will not affect the basic performance of plastic products.
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