The plastic molding process is an engineering technique that involves various processes for converting plastic into plastic products. One or more of the following situations often occur during the transition, such as rheology of the polymer and changes in physical and chemical properties. There are many methods for plastic molding: compression molding; extrusion molding; injection molding; blow molding; calendering; vacuum forming; rotational molding; casting; Let's take a look at it:
1. Compression molding;
It is mainly used for the molding of phenolic resin, urea-formaldehyde resin and unsaturated polyester resin thermosetting plastic. Compression molding is the use of a molding press and a molding die, and heating is continued after compression molding by a chemical reaction to crosslink and cure. The molding process and equipment are relatively simple and have wide adaptability. The equipment used for press forming mainly includes hydraulic presses and laminating machines, which are hydraulically driven press machines.
2, extrusion;
Extrusion, also known as extrusion molding, heats and melts the material into a viscous flow state, and pushes the material in the viscous flow state by means of the screw extrusion, so that it passes through the die and becomes a continuum of the cross-section and the shape of the die. method. It mainly includes two parts: forming host and auxiliary device.
3. Injection molding;
Injection molding can also be used to form thermoset plastics and foams. The advantages of injection molding are fast production speed, high efficiency, automatic operation, and the ability to form complex-shaped parts, especially suitable for mass production. The disadvantages are high equipment and mold costs, and it is difficult to clean the injection molding machine. The injection molding equipment is an injection molding machine. Injection molding is a method in which a thermoplastic melt is injected into a mold under high pressure using an injection molding machine (or an injection machine) to obtain a product by cooling and solidifying.
4, blow molding;
Blow molding is also known as hollow blow molding or hollow molding. Blow molding is a method of inflating a resin parison that is heated in a mold into a hollow article by the pressure of compressed air. The blow molding includes both a blown film and a blown hollow article.
5, calendering;
Calendering is the process of processing (mixing, filtering, etc.) the resin and various additives into a film or sheet through the gap of two or more opposite rolling rolls of a calender, and then peeling off from the calender roll. , and then cooled and shaped.
6, vacuum forming;
Thermoplastic sheets or sheets (thickness less than 6 mm) are reheated and softened.
7. Rotational molding;
The powdered or paste-like plastic is placed in a molding, and the mold is melted and plasticized by heating and rolling, thereby uniformly spreading the material to the surface of the mold, and cooling is shaped to obtain a product.
8. Casting molding;
The liquid resin mixture into which the curing agent and other auxiliary materials are added is poured into a molding die, and gradually solidified under normal temperature or heating to form a plastic product of a certain shape.
9. Winding molding;
This is a process for making fiber reinforced plastic articles (formulated into glass reinforced plastic) of cylindrical, spherical, tubular, square box or shaped rotors.
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Glass ceramics, also known as glass-ceramics, are a composite of a combination of crystalline phase and glass that has been produced by high temperature melting, forming, and heat treatment. It has excellent mechanical strength, thermal expansion performance, thermal shock resistance, chemical resistance, low dielectric loss and other superior properties.Glass ceramics are widely used in machinery manufacturing, optics, electronics and microelectronics, aerospace, chemical, industrial, biomedical and construction. Due to the complicated manufacturing process and high technical requirements of the glass ceramic panel, the high-quality glass ceramic production process and control technology are basically monopolized by foreign countries. Therefore, the domestic glass ceramic production process has problems of poor quality and low yield.
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