With the development of plastic plastics industry, the application field of plastic suction is becoming more and more widely. From the beginning of the sheet to the plastic plastic injection molding machine, from the simple plastic tray, the electronic tray to the current plastic turnover tray, the hardware tool car, the cooling water tower, the bathtub, and the inward car. Plastic parts and so on, from the original plastic packaging products to become part of the product absorption, it can be said that plastic plastic products are now everywhere in our lives.
The application of lower suction in various industries is introduced.
Plastic car industry:
Automobile interior trim, motorcycle decorative plate, electric scooter shell, automobile engine cover, logistics turnover tray, tool car shell.
Absorption of food, medical and household appliances industry:
Plastic food tray (egg tray, fast food box, cup cover, food preservative tray, etc.), cosmetics and other plastic packaging, refrigerator internal bladder plastic, bathtub, electronic pallets, door panels, medical appliances, lamps and so on.
The type of mold is usually classified according to the different processing objects and processes. From the industry angle, there are plastic mold, rubber mold, metal cold stamping die, metal cold extrusion die and hot extrusion die, metal drawing die, powder metallurgy die, metal die casting die, metal precision casting mold, Glass moulds, FRP molds and so on.
The following is only the classification and introduction of different types of moulds used in the molding process of plastic products imported most frequently.
The most common molding methods for plastics are generally divided into two categories: melt forming and solid phase molding: melt forming is the way to heat the plastic above the melting point to make it in the melting state. The molding process of this molding method mainly includes injection molding, compression molding (shrinkage) molding, extrusion molding, etc. A kind of molding method of plastics under the melting temperature under solid state, such as vacuum molding, compressed air molding and blow molding for some plastic packaging containers. In addition, there are liquid molding methods, such as casting molding, lining and dipping molding.
According to the different molding methods, we can divide the plastic mold types for different process requirements, including injection molding mold, extrusion mold, plastic molding mold, blow molding mold, plastic molding mold, high foam polystyrene molding mold and so on.
Plastic injection (plastic) mold
It is mainly a molding mold used most widely in the production of thermoplastic plastic parts. The corresponding processing equipment for plastic injection molding is plastic injection molding machine. The plastic is first heated and fused in the heating barrel of the bottom of the injection machine, then it is pushed by the screw or plunger of the injection machine, and the injector and mould of the injection machine is poured. The injection system enters the mold cavity, the plastic is cooled, hardened and molded, and the product is obtained by demoulding. Its structure is usually made up of forming parts, gating system, guiding parts, ejecting mechanism, temperature regulating system, exhaust system, supporting parts and so on. The manufacturing materials usually use plastic mould steel module, commonly used materials are carbon structural steel, carbon tool steel, alloy tool steel, high speed steel and so on. The injection molding process is usually only suitable for the production of thermoplastic products. The plastic products produced by injection molding are very wide. From daily necessities to various complex machinery, electrical appliances and transportation tools parts are all molded with injection moulds, which are the most widely used in the production of plastic products. Working methods.
Plastic moulds
It includes two types of die types: compression molding and press casting. They are mainly used for molding thermosetting plastics, and the corresponding equipment is pressure forming machine. The compression molding method is based on the plastic characteristics, heating the mold to the molding temperature (usually at 103 -180 C), and then putting the measured plastic powder into the mold cavity and the feeding room, and closing the mold. The plastic is softened and sticky under the action of high heat and high pressure. After a certain time, the molding is fixed and formed to become the shape of the required product. Pressure injection molding and compression molding is different from a separate feeding room. Before molding, the mold is closed first. The plastic is put in a viscous flow in the feeding room. Under the pressure, the mold is squeezed into the mold cavity and hardened. The compression mold is also used to form certain special thermoplastic plastics such as refractory thermoplastic (such as polytetrafluoroethylene) blank (cold pressed molding), high optical resin lenses, slightly foamed nitrocellulose automobile steering wheel and so on. The mould is mainly composed of mould cavity, feeding chamber, guiding mechanism, pushing parts and heating system. The injection mould is widely used to encapsulate electrical components. The material used for pressing dies is basically the same as that of injection moulds.
Plastic extrusion die
It is used to form a kind of mould for producing continuous shape plastic products, also called extrusion molding machine head. It is widely used in the processing of pipe, bar, monofilament, sheet, film, wire and cable covering layer, special type material and so on. Its corresponding production equipment is a plastic extruder, the principle of which is to melt and plasticize solid plastics under the condition of rotating and pressurizing the screw of the extruder. Through a specific shape of the die, a continuous plastic product with the same shape of the section and the die is made. Its manufacturing materials include carbon structural steel, alloy tool steel, etc. Some Extrusion Moulds will also wear diamond wear-resistant materials on wearable parts. Extrusion process is usually only applicable to the production of thermoplastic products, which is in structure and injection molding.