What are the types of plastic molding

What are the types of plastic molding

The most common plastic molding method is generally divided into melt molding and solid phase molding two categories: melt molding is the plastic heated to the melting point above, so that it is in the molten state of molding processing method, attributed to this molding method of molding process mainly injection molding, compression molding (shrinkage) molding, extrusion molding, etc.; Solid phase molding refers to the plastic in the melting temperature below adhere to a kind of solid molding method, such as some plastic packaging containers produced by vacuum molding, compressed air molding and blow molding, etc. In addition, there are liquid molding methods, such as casting molding, enameling and dip molding.

According to the above molding method is not the same, can be divided into plastic processing mold types corresponding to different process requirements, the first is injection molding mold, extrusion molding mold, pressure molding mold, blow molding mold, blister molding mold, high foam polystyrene molding mold, etc. Sea plastic molding

Plastic injection (plastic) mould

It was first used in the thermoplastic plastic products produced the most throughout a forming mould, plastic injection molding mold corresponding processing equipment is plastic injection moulding machine, plastic in the first place in the bottom of the injection machine heating cylinder heated melting, and then in the injection machine screw or plunger propulsion, the injection machine nozzle and mould gating system into the mold cavity, cooling hardening plastic molding, Demoulding to get the product. Its layout is generally composed of molding parts, casting system, guide parts, launch organization, temperature control system, exhaust system, support parts and some other components. Production data generally choose plastic mold steel module, commonly used materials mainly for carbon layout steel, carbon tool steel, alloy tool steel, high speed steel, etc. Injection molding processing method generally applies only to thermoplastics types of products produced, produced by injection molding process has a very wide range of plastic products, from a living groceries to mechanical, electrical appliances, vehicles of all kinds of clutter parts are made of injection molding, such as it is the most widely used in plastic products produced a kind of processing method.

Plastic moulds

Contains compression molding and injection molding two types of layout mold. They are primarily used to form a type of thermosetting plastic mold, the corresponding equipment is the pressure molding machine. The compression molding method is based on the characteristics of the plastic, the mold is heated to the molding temperature (generally in 103℃-180℃), and then the measured pressure powder into the mold cavity and feeding chamber, close the mold, plastic in high heat, high pressure under the effect of softening viscous flow, after a certain time after solidification, become the required product shape. Different from compression molding, injection molding is provided with a separate feeding chamber. Before molding, the mold is closed first. The plastic is preheated in the feeding chamber to show viscous flow, and is squeezed into the mold cavity at high speed under the effect of pressure, and hardening is formed. The compression mold is also used to shape some special thermoplastics such as difficult to melt the thermoplastics (such as Teflon) blank (cold molding), high optical function of resin lenses, fine foaming nitric cellulose car steering wheel, etc. The pressing mold is mainly composed of cavity, feeding cavity, guiding organization, pushing out parts, heating system, etc. Injection moulds are widely used to encapsulate electrical components. The materials used to make the moulds are the same as the injection moulds.

Plastic extrusion die

It is a kind of mold used for forming and producing plastic products of continuous shape, also known as extrusion molding machine head. It is widely used in the processing of pipe, bar, monofilament, sheet metal, film, wire and cable cladded layer, profiled material and so on. The corresponding production equipment is a plastic extruder, whose principle is that solid plastic is melted and plasticized under heating and the screw rotation and pressure of the extruder, and the cross section of the mouth die is made into continuous plastic products with the shape of the mouth die after a specific shape. Its production materials mainly include carbon layout steel, alloy tool steel, etc., and some extrusion dies will be inlaid with diamond and other wear-resistant materials on the parts that require wear-resisting. Extrusion processing technology is generally only applicable to the production of thermoplastic products, and its layout is significantly different from that of injection moulds and compression moulds.

Plastic blow moulds

Is used for molding plastic hollow container class products (such as beverage bottle, cosmetic products all kinds of packaging containers) of a mold, blow moulding way according to the technology principle of the primary extrusion blow molding hollow molding, injection blow molding hollow molding, injection stretch blow molding hollow molding (commonly known as "note blow"), multi-layer hollow blow molding, sheet molding, hollow molding, etc. Hollow products blow molding equipment is generally known as the plastic blow molding machine, blow molding is only suitable for the production of thermoplastic products. The layout of the blow mold is relatively simple, and the materials used are mostly made of carbon steel.

Plastic Blister Mould

It is a kind of mold that takes plastic plate and sheet as material to form some more simple plastic products. Its principle is to use vacuum forming method or compressed air forming method to make the plastic plate and sheet fixed on the concave die or punch die. Under the condition of heating and softening, the plastic plate and sheet are deformed and affixed to the cavity of the mold to get the desired forming products. Mainly used for some daily necessities, food, toys, packaging products production. Blister mold because of the low pressure when forming, so the mold data are mostly made of cast aluminum or non-metal data, and the layout is more simple.

High foam polystyrene molding mold

It is a mold that uses expandable polystyrene (a beaded particle composed of polystyrene and foaming agent) material to form various required shapes of foam packaging materials. The principle is that the polystyrene can be formed by steam in the mold, including two types of simple manual operation mold and hydraulic straight-through foam mold. It is mainly used to produce packaging products of industrial products. The materials for making this kind of mold are cast aluminum, stainless steel, bronze and so on.

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