6 Kinds of Plastic Molds – Do You Know All About Them?

plastic molds

Today, Yankang shares 6 kinds of plastic molds with you.

Plastic molds are tools used in the plastics processing industry to match plastic molding machines, giving plastic products a complete configuration and precise dimensions.

According to the different molding methods, it can be divided into different mold types.

  1. Plastic Molds-Injection mold

It is mainly a molding mold that is most commonly used in the production of thermoplastic parts. The processing equipment corresponding to the injection mold is an injection molding machine.

plastic molds-injection-mold

The plastic is first heated and melted in the heating barrel of the injection molding machine and then pushed into the mold cavity through the injection molding machine nozzle and the casting system of the mold under the push of the screw or plunger of the injection molding machine. The plastic is cooled and hardened to form the product.

The structure is usually composed of a molded part, a pouring system, a guiding part, a pushing mechanism, a temperature regulating system, an exhaust system, a supporting part, and the like, and is manufactured by using plastic mold steel.

Injection molding processing is usually only applied to the production of thermoplastic products. The plastic products produced by the injection molding process are very extensive. From daily necessities to all kinds of complex electrical appliances, auto parts, etc. are molded with injection molds. It is the most widely used processing method in the production of plastic products.

  1. Plastic Molds-Blow mold

plastic molds-blow mold

A mold for molding hollow containers of plastic containers (such as beverage bottles, daily chemical products, etc.).

The equipment corresponding to blow molding of hollow products is commonly referred to as a plastic blow molding machine.

Blow molding is only suitable for the production of thermoplastic products.


  1. Plastic Molds-Extrusion mold

plastic molds-extrusion mold

A type of mold used to form a continuous shape of plastic products, also known as an extrusion molding head. Widely used in the processing of pipes, rods, monofilaments, plates, films, wire and cable coatings, profiles, 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 of the extruder, and a continuous plastic product having the same cross-section and shape as the die is formed by a die of a specific shape.

The manufacturing materials mainly include carbon structural steel, alloy tools, etc. Some extrusion dies are also embedded with wear-resistant materials such as diamond on parts that require wear resistance.

The extrusion process is usually only applicable to the production of thermoplastic products, which are structurally distinct from injection molds and compression molds.

  1. Plastic Molds-Blister Mould

plastic molds-blister mould

A mold for forming some simple plastic products from plastic sheets and sheets.

The principle is that the plastic plate and the sheet fixed on the die or the punch are deformed by heating and softening to be attached to the cavity of the mold by a vacuuming method or a compressed air forming method to obtain a desired molded product. Mainly used in the production of some daily necessities, food, toys, and packaging products.

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

  1. Plastic Molds-Compression mold

It includes two types of structural molds, compression molding, and injection molding.

They are a type of mold mainly used to form thermosetting plastics, and the corresponding equipment is a pressure forming machine.

The compression molding method heats the mold to a molding temperature (generally 103°108°) depending on the characteristics of the plastic. Then, the metered plastic powder is placed in the mold cavity and the feeding chamber, and the mold is closed. The plastic softens and viscous under the action of high heat and high pressure, and solidifies and shapes after a certain time, and becomes the desired product shape.

Injection molding differs from compression molding in that there is no separate feed chamber. Before the molding, the mold is closed first, and the plastic is preheated in the feeding chamber to be in a viscous flow state and is pressed into the mold cavity under the action of pressure to harden the molding.

The compression molding die is mainly composed of a cavity, a feeding cavity, a guiding mechanism, a pushing part, a heating system, and the like. Injection molds are widely used to package electrical components. The material used in the manufacture of compression molding is basically the same as that of the injection mold.

  1. Plastic Molds-High expansion polystyrene molding mold

It is a mold for forming foamed packaging materials of various desired shapes by using expandable polystyrene (beads composed of polystyrene and foaming agent).

The principle is that the polystyrene can be steamed into the mold. These include simple hand-operated molds and hydraulic press straight-through foam molds. Mainly used to produce packaging products for industrial products. The materials for manufacturing such molds are cast aluminum, stainless steel, bronze, and the like.

6 kinds of plastic mould are introduced here.

For information about blow molding machine,please click blow molding machine blog.


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