Main classification of plastic molds

According to different molding methods, the types of plastic molds corresponding to different process requirements can be divided, mainly including injection molding molds, extrusion molding molds, Blister molding molds, high foamed polystyrene molding molds, etc.

1. Plastic injection (plastic) mould

Injection mold manufacturers remind you that it is mainly a kind of molding mold, which is widely used in the production of thermoplastic parts. The corresponding processing equipment of injection mold is injection molding machine. The plastic is heated and melted in the heating cylinder at the bottom of the injection machine, and then melted in the heating cylinder of the injection machine. Driven by the screw or plunger, it enters the mold cavity through the nozzle of the injection machine and the gating system of the mold. The plastic is cooled and hardened to form, and then the product is demoulded. The structure is usually composed of forming parts, gating system, guide parts, ejector mechanism, temperature control system, exhaust system, support parts and other parts. Plastic mold steel module is usually used for manufacturing materials. The commonly used materials are carbon structural steel, carbon tool steel, alloy tool steel, high-speed steel, etc. The injection molding process is usually only applicable to the production of thermoplastic products. Plastic products produced by injection molding process are very extensive. From daily necessities to various complex mechanical, electrical and transportation parts, they are made by injection molding. This is a processing method widely used in the production of plastic products.

2. Plastic compression mould

It includes two structural mold types: compression molding and injection molding. They are mainly used to form a mold for thermosetting plastics, and their corresponding equipment is a pressure forming machine. According to the characteristics of plastics, the compression molding method heats the mold to the molding temperature (usually 103 ° - 108 °), then puts the measured compressed powder into the mold cavity and feed cavity, and then closes the mold. The plastic is under high temperature and pressure. It is a softened viscous flow, which solidifies and forms the desired product shape after a period of time. The difference between injection molding and compression molding is that there is a separate feed chamber. The mold is closed before forming. The plastic is preheated in the feed chamber and is in a viscous flow state. It is adjusted and extruded into the die cavity under pressure to harden and form. The compression mold is also used for moulding some thermoplastics, such as refractory thermoplastic (such as polyvinyl fluoride) blanks (Leng Chengxing), resin lenses with high optical properties, and slightly nitrifying cellulose automotive steering wheels. The die is mainly composed of cavity, feeding cavity, guiding mechanism, ejection part, heating system, etc. Shandong commodity mould manufacturers tell you that injection mould is widely used for packaging electrical components. The material used to make the die is basically the same as that of the injection mold.

3. Plastic extrusion die

Plastic extrusion die is a kind of die for forming and producing plastic products with continuous shape, also known as extrusion head. It is widely used in the processing of pipes, bars, monofilaments, plates, films, wire and cable coatings and profiles. The corresponding production equipment is plastic extruder. The principle is that the solid plastic is melted and plasticized under the conditions of heating, screw rotation of the extruder and pressure, and the cross section is the same as the shape of the mold through the mold with a specific shape. Continuous plastic products. Its manufacturing materials mainly include carbon structural steel, alloy tools, etc. Some extrusion dies will also embed high-quality materials, such as diamond, on parts requiring high-quality parts. Extrusion process is usually only applicable to the production of thermoplastic products, and its structure is obviously different from injection mold and die.

4. Plastic blow mold

Injection mold manufacturers tell you that it is a kind of mold used to form plastic container hollow products (such as beverage bottles, daily chemical products and other packaging containers). According to the process principle, the forms of blow molding mainly include extrusion blow molding, injection blow molding, injection extended blow molding (commonly known as "injection pull blowing"), multi-layer blow molding, sheet blow molding, etc. The equipment corresponding to blow molding of hollow products is usually called plastic blow molding machine. Blow molding is only applicable to the production of thermoplastic products. The structure of blow molding die is relatively simple, and the materials used are mostly made of carbon.

5. Plastic blister mould

Plastic blister mold is a kind of mold that takes plastic plates and sheets as raw materials to form some relatively simple plastic products. Its principle is to use vacuum blooming method or compressed air forming method to deform the plastic plates and sheets fixed on the concave or convex mold under the condition of heating and softening and stick them on the mold cavity to obtain the required molding products. It is mainly used for some daily necessities, food Toy packaging products production. Because the pressure of blister mold is low during forming, the mold material is mostly made of cast aluminum or non-metallic materials, and the structure is relatively simple.

6. High foaming polystyrene molding die

It is a kind of mold which uses the polystyrene (polystyrene and foaming agent) as raw material to form all kinds of required shape foam plastic packaging materials. The principle is that the polystyrene can be molded into the mold by steam, including two types of simple manual mold and straight through foam mold for hydraulic machines, mainly used for the production of industrial products packaging products. The materials for manufacturing this kind of mold include cast aluminum, stainless steel, bronze, etc.