As the name suggests, Custom shell is a method of processing plastic into parts. There are nearly a hundred methods for processing plastic parts such as household appliance shells, but the plastic mold forming method is still the commonly used method of plastic processing into parts in production. At present, 90% of the processing of plastic shell products on the market is mainly completed by mold forming. Generally, according to the difference of the physical state in the plastic shell forming process, the processing method of plastic forming can be divided into two ways: melt forming and solid phase forming.
Melt forming is also called melt forming, which refers to a method in which the Custom shell is heated to above the melting point and placed in a molten state for forming and processing when processing the plastic shell. Such forming methods mainly include compression molding, transfer molding, injection molding, extrusion molding, rotational molding, centrifugal casting molding, powder molding and so on.
Solid-phase forming refers to a forming method in which Custom shell products such as household appliance housings are placed below the melting temperature, at least 10°C to 20°C lower than the melting point, while the plastic is still in a solid state. The advantage of this method is to save energy. . For amorphous plastics, the forming process in the highly elastic region above the glass transition temperature and below the melting point is called hot forming, and the forming process below the glass transition temperature is called cold forming or room temperature forming.
Thermoforming is to press and fix the prefabricated Custom shell sheet on the plastic mold, heat and soften the sheet, and then evacuate one side of the mold forming surface into a vacuum state, or compress air on the other side to bring the plastic sheet close to the mold surface and cool After molding, the mold is demolded to obtain a thermoformed plastic part. In the process of using this forming method to manufacture auto parts or electrical appliance housings, compressed air or auxiliary plungers can also be used to stretch the sheet blanks, thereby improving the uniformity of wall thickness and the physical and mechanical properties of plastic parts.
Room temperature forming, also called solid phase forming, is a forming process of Custom shell. Generally, a method of applying mechanical pressure to a thermoplastic blank at room temperature to make it a Custom shell part. Such as plastic powder rolling at room temperature, sheet rolling, cold drawing stamping forming, blank or powder plastic forming, etc. belong to this column.
The above-mentioned plastic outer forming method is based on the division type of physical change forming. During the plastic forming process of household appliance housings, the main physical changes include phase change, deformation and movement, mechanical separation, or thermal degradation, and light crosslinking. Generally, plastic molds will produce the above physical changes during plastic extrusion molding, injection molding, pressure molding, pouring molding and other molding processes. In general plastic molds, plastic extrusion molding, injection molding, compression molding, pouring molding, etc. all belong to this type of physical change molding. When the plastic shell is processed, the processing efficiency of this method is relatively high, and the quality of the processed product is also high. So it is very popular with enterprises.
Arun kumar 