According to different moulding methods, plastic processing mould types corresponding to different process requirements can be divided, mainly including injection moulding moulds, extrusion moulding moulds, plastic moulding moulds, high-foam polystyrene moulding moulds, etc.
- Plastic injection (plastic) mould
It is mainly a moulding mouldmost commonly used in the production of thermoplastic plastic parts. The processing equipment corresponding to plastic injection moulds is a plastic injection moulding machine. The plastic is first heated and melted in the heating barrel at the bottom of the injection machine, and then in the screw of the injection machine. Or pushed by the plunger, enter the mouldcavity through the injection system of the injection machine nozzle and the mould, the plastic is cooled and hardened, and the product is released from the mould. Its structure is usually composed of moulded parts, pouring system, guide parts, ejection mechanism, temperature adjustment system, exhaust system, support parts and so on. The manufacturing materials are usually plastic mould steel modules. The commonly used materials are mainly carbon structural steel, carbon tool steel, alloy tool steel, high-speed steel, etc. The injection moulding processing method is usually only suitable for the production of thermoplastic products. The plastic products produced by the injection moulding process are very wide. From daily necessities to various complicated machinery, electrical appliances, vehicle parts, etc., are formed by injection moulding. It is the most widely used processing method in the production of plastic products.
Plastic compression mould
Including compression moulding and injection moulding two structural mouldtypes. They are a type of mouldmainly used for moulding thermosetting plastics, and the corresponding equipment is a pressure moulding machine. According to the characteristics of plastics, the compression moulding method heats the mould to the moulding temperature (generally between 103 ° and 108 °), and then puts the measured compression moulding powder into the mould cavity and the charging chamber, and closes the mould. The plastic is under high heat and high pressure It is softened and viscous, solidified and shaped after a certain period of time, and it becomes the desired product shape. The difference between compression injection moulding and compression moulding is that there is a separate feeding chamber. Before moulding, the mould is closed first. The plastic is preheated in the feeding chamber in a viscous state. Under pressure, it is adjusted into the mould cavity and hardened. Compression moulds are also used to mould some special thermoplastics such as difficult-to-melt thermoplastics (such as polyvinyl fluoride) blanks (cold compression moulding), resin lenses with high optical performance, slightly foamed nitrocellulose automobile steering wheels, etc. . Compression mould is mainly composed of cavity, feeding cavity, guide mechanism, ejecting parts, heating system and so on. Pressure injection moulds are widely used to encapsulate electrical components. The materials used in the manufacture of compression moulds are basically the same as injection moulds.
Plastic extrusion die
A type of mouldused to produce continuous-shaped plastic products, also known as extrusion moulding heads, is widely used in the processing of pipes, rods, monofilaments, plates, films, wire and cable coatings, and shaped materials. The corresponding production equipment is a plastic extruder, the principle of which is that solid plastic is melted and plasticized under the conditions of heating and screw rotation and pressure of the extruder, and is made into a cross-section with the shape of the die by a specific shape Continuous plastic products. Its manufacturing materials mainly include carbon structural steel, alloy tools, etc. Some extrusion dies are also inlaid with diamond and other wear-resistant materials on the parts that need to be wear-resistant. Extrusion process technology is usually only applicable to the production of thermoplastic products, which is significantly different from injection moulds and compression moulds in structure.
Plastic blow mould
It is a mouldfor moulding hollow products of plastic containers (such as various packaging containers such as beverage bottles and daily necessities). The form of blow moulding mainly includes extrusion blow moulding hollow moulding and injection blow moulding hollow moulding according to the process principle. , Injection stretch blow moulding hollow moulding (commonly known as "injection stretch blow moulding"), multilayer blow moulding hollow moulding, sheet blow moulding hollow moulding, etc. The equipment corresponding to the blow moulding of hollow products is usually called a plastic blow moulding machine. Blow moulding is only suitable for the production of thermoplastic products. The structure of the blow mouldis relatively simple, and the materials used are mostly made of carbon.
Plastic blister mould
It is a mouldthat uses plastic plates and sheets as raw materials to form some simpler plastic products. The principle is to use vacuum blooming methods or compressed air forming methods to make the plastic plates and sheets fixed on the concave or convex mould. Under the condition of heating and softening, it deforms and sticks to the cavity of the mouldto obtain the desired moulded product, which is mainly used in the production of some daily necessities, food, and toy packaging products. The plastic mould has lower pressure during moulding, so the mould material is mostly made of cast aluminum or non-metallic materials, and the structure is relatively simple.
High foam polystyrene mould
It is a mouldthat uses expandable polystyrene (beads composed of polystyrene and foaming agent) to form foam packaging materials of various shapes. The principle is that expandable polystyrene can be steam-formed in the mould, including two types of simple manual operation mouldand hydraulic machine straight-through foam plastic mould. It is mainly used to produce packaging products for industrial products. The materials for manufacturing such moulds are cast aluminum, stainless steel, bronze and so on.
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