According to the different molding methods, the plastic […]
According to the different molding methods, the plastic processing mold types corresponding to different process requirements can be divided, mainly including injection molding mold, extrusion molding mold, Blister molding mold, high foaming polystyrene molding mold, etc.
1. Plastic injection mold
It is mainly a kind of molding mold which is widely used in the production of thermoplastic parts. The processing equipment corresponding to the plastic injection mold is the plastic injection molding machine. First, the plastic is heated and melted in the heating barrel at the bottom of the injection machine, and then, driven by the screw or plunger of the injection machine, enters through the nozzle of the injection machine and the pouring system of the mold Mold cavity, plastic cooling hardening molding, demoulding products. Its structure is usually composed of forming parts, pouring system, guiding parts, pushing mechanism, temperature regulating system, exhaust system, supporting parts, etc. Plastic mold steel module is usually used as the manufacturing material, and the commonly used materials are mainly carbon structural steel, carbon tool steel, alloy tool steel, high-speed steel, etc. Injection molding process is usually only applicable to the production of thermoplastics. The plastic products produced by injection molding process are very extensive. From daily necessities to all kinds of complex machinery, electrical appliances, vehicle parts, etc. are molded by injection mold. It is the most widely used processing method in the production of plastic products.
2. Plastic press mold
Including compression molding and injection molding two types of structural mold. They are a kind of molds mainly used for forming thermosetting plastics, and the corresponding equipment is a pressure forming machine. According to the plastic characteristics, the compression molding method heats the mold to the molding temperature (generally 103 ° - 108 °), and then puts the metered compression molding powder into the mold cavity and the feeding room, closes the mold, the plastic is softened and viscous under the action of high heat and high pressure, solidifies and finalizes after a certain time, and becomes the required product shape. The difference between injection molding and compression molding is that there is a separate feeding room. Before molding, the mold is closed first, and the plastic is preheated in the feeding room in a viscous flow state. Under the pressure, it is adjusted and squeezed into the mold cavity to harden the mold. Compression molds are also used to form some special thermoplastic materials, such as hard to melt thermoplastic (such as polyvinylidene fluoride) blanks (cold press molding), resin lenses with high optical performance, slightly foaming nitrocellulose automobile steering wheel, etc. The die is mainly composed of cavity, feeding cavity, guiding mechanism, ejecting parts, heating system, etc. The injection mold is widely used in the packaging of electrical components. The material used in the manufacturing of the injection mold is basically the same as that of the injection mold.
3. Plastic extrusion die
A kind of mould, also called extrusion head, which is used to produce continuous shape plastic products, is widely used in the processing of pipes, bars, monofilament, plates, films, wire and cable coating, profiles, etc. The corresponding production equipment is a plastic extruder. Its principle is that the solid plastic melts and plasticizes under the conditions of heating and rotating and pressing the screw of the extruder. The continuous plastic products with the same cross section and die shape are made through the specific shape of the die. Its main materials are carbon structural steel, alloy tools, etc. Some extrusion dies will be inlaid with diamond and other wear-resistant materials on the parts that need wear-resistant. The extrusion process is usually only suitable for the production of thermoplastic products, which is different from injection mold and compression mold in structure.
4. Plastic blow mold
It is a kind of mold used to form hollow products (such as beverage bottles, daily chemical products and other packaging containers) of plastic containers. Blow molding forms mainly include extrusion blow molding, injection blow molding, injection extended blow molding (commonly known as "injection drawing blow"), multi-layer blow molding, sheet blow molding and so on. The corresponding equipment for 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 simple, and the materials used are mostly carbon.
5. Plastic blister mold
It is a kind of mold which uses plastic plate and sheet as raw materials to form some simpler plastic products. Its principle is to use the method of vacuum opening or compressed air forming to make the plastic plate and sheet fixed on the concave or convex die deform under the condition of heating and softening and stick on the mold cavity to get the required molding products. It is mainly used for some daily necessities, food and toy packaging products Production. Because of the low pressure when forming, the mould materials are mostly made of cast aluminum or non-metallic materials, and the structure is relatively simple.
6. High foaming polystyrene molding mold
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 making the mould are cast aluminum, stainless steel, bronze, etc.