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Six categories of plastic molds

Plastic molds are tools in the plastics processing industry that are used in conjunction with plastic molding machines to give plastic products a complete configuration and precise dimensions. According to the different molding methods, it can be divided into different types of molds.

Injection mold

Injection mold

It is mainly used in the production of thermoplastic plastic products. The corresponding processing equipment for injection mold is injection molding machine. The plastic is first heated and melted in the heating cylinder at the bottom of the injection molding machine, and then the screw or column of the injection molding machine is used. Pushed by a plug, the injection system of the injection molding machine nozzle and the mold enters the mold cavity, the plastic is cooled and hardened, and the mold is released to obtain the product.

Its structure is usually composed of molding parts, casting system, guide parts, ejection mechanism, temperature control system, exhaust system, support components, etc. The manufacturer uses plastic mold steel. Injection mold processing methods are generally only applicable to the production of hot plastic products. The plastic products produced by injection molding process are very extensive. From daily necessities to all kinds of complicated electrical appliances and auto parts, all are molded by injection molding. It is one of the most widely used processing methods in the production of plastic products.

Blow mold

A mold used to form hollow plastic products (such as beverage bottles, daily chemical products, and other packaging containers). The blow molding process is based on the principle of extrusion blow molding, injection molding, injection blow molding, Injection stretch blow molding (commonly known as injection blowing), multilayer blow molding, sheet blow molding, etc. The equipment corresponding to the blow molding of the hollow products is usually called a plastic blow molding machine, and the blow molding is only applicable to the production of the hot plastic variety products. Blow mold structure is relatively simple and the materials used are mostly made of carbon.

Extrusion mold

A type of mold used to form continuous shape plastic products, also called extrusion molding head, is widely used in the processing of pipes, rods, monofilaments, plates, films, wire and cable coatings, profiled materials, etc.

The corresponding production equipment is a plastic extruder. The principle is that the solid plastic is melted and plasticized under the conditions of heating and screw rotation and pressurization of the extruder. The cross section and the shape of the die are the same through a specific shape of the die with continuous plastic products. Its manufacturing materials mainly include carbon structural steels, alloy tools, etc. Some extrusion dies are also inlaid with diamonds and other wear-resistant materials on parts that require wear resistance.

Extrusion processes are generally only applicable to the production of thermoplastic products, which are structurally distinct from injection molds and compression molds.

Plastic mold

A mold which some simpler plastic products using plastic plates and sheets as raw materials. The principle is to make plastic plates and sheets fixed on the female molds or punches heated by a vacuum blooming method or a compressed air molding method. Under the condition of softening, it is deformed and affixed to the cavity of the mold to obtain the desired molded product, which is mainly used for the production of some daily necessities, foods, toys and packaging products.

Because the pressure of the plastic mold is low during molding, the mold material is usually made of cast aluminum or non-metal materials, and the structure is relatively simple.

Plastic mold

Compression mold

Two structural mold types which including compression molding and injection molding. They are a type of mold that is mainly used to form thermosetting plastics, and the corresponding equipment is a pressure molding machine.

Compression molding method According to the characteristics of plastics, the mold is heated to the molding temperature (usually 103°108°), then the powdered plastic powder is put into the mold cavity and feed chamber, and the mold is closed. The plastic is exposed to high heat and high pressure. Soften the viscous flow, after a certain period of time after curing solidification, become the desired product shape.

High-expanded polystyrene molding die

The principle is that the polystyrene can be steam molded in the mold, including two types of simple manual operation mold and hydraulic machine straight-through foam mold, mainly used for the production of industrial products packaging products. The materials used to make such molds are cast aluminum, stainless steel, and bronze.

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