Processing steps of the hottest plastic products

2022-08-17
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Processing steps of plastic products

Plastic processing is also known as plastic molding processing. It is the general name of various processes that convert synthetic resin or plastic into plastic products. It is a larger production department in the plastic industry. Plastic processing generally includes plastic ingredients, molding, machining, jointing, decoration and assembly. The last four processes are carried out after plastic has been molded into products or semi-finished products, also known as plastic secondary processing

in addition to polymers, the raw materials used in plastic processing generally need to add various plastic additives, such as stabilizers, plasticizers, colorants, lubricants, reinforcements and fillers, in order to improve the molding process and the use performance of products or reduce the cost of products

The key link of plastic processing is molding. Various forms of plastic, such as powder, pellets, solutions, dispersions, etc., are made into products or blanks of the desired shape. There are more than thirty molding methods, and its choice mainly depends on the type of plastic, thermoplastic or thermosetting; The initial shape and the shape and size of the product. Common methods for processing thermoplastic plastics include extrusion, injection molding, calendering, blow molding and thermoforming. Generally, molding, transfer molding and injection molding are used for processing thermosetting plastics

machining refers to the processing methods of metal and wood. 4. Experimental principles and methods are used to manufacture plastic products with precise dimensions or a small number, which can also be used as an auxiliary process of molding, such as sawing of extruded profiles. Because the performance of plastic is different from that of metal and wood, plastic has poor thermal conductivity, low coefficient of thermal expansion and modulus of elasticity. When the pressure of fixture or tool is too large, it is easy to cause deformation, and it is easy to melt when heated during cutting, and it is easy to adhere to the tool. Therefore, when machining plastics, the cutting tools used and the corresponding cutting speed should adapt to the characteristics of plastics. Common machining methods include sawing, shearing, punching, turning, planing, drilling, grinding, polishing, thread processing, etc

bonding is the bonding of plastic parts, which is divided into welding and bonding. Welding method refers to hot-air welding with electrodes, hot-melt welding with hot electrodes, high-frequency welding, friction welding, induction welding, and ultrasonic welding for the long-term trend in the industry. Bonding method can be divided into flux, resin solution and hot-melt adhesive according to the adhesive used

the purpose of surface modification is to beautify the surface of plastic products, usually including mechanical modification. The theme of the inaugural meeting is "give play to advantages, change the situation, work together and create a win-win situation", that is, use filing, grinding, polishing and other processes to remove burrs and burrs on products, and correct dimensions; Finishing, including coating the surface of parts with paint, brightening the surface with solvent, and pasting the surface of products with patterned film; Painting, including painting, printing and hot stamping; Metal plating, including vacuum coating, electroplating and chemical silver plating. Hot stamping is to transfer the color aluminum foil layer (or other pattern film layer) on the hot stamping film to the workpiece under heating and pressure. Many household appliances, building products, daily necessities, etc. use this method to obtain patterns such as metallic luster or wood grain

the assembly adopts the methods of bonding, welding and mechanical connection, so that the made plastic parts are assembled into a complete product. The movable brush of the potentiometer displacement sensor in Figure 1 is connected with the measured object. For example, plastic profiles are assembled into plastic window frames and plastic doors through sawing, welding, drilling and other steps

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