Types of Injection Molds: Understanding the Various Categories

Types of Injection Molds: Understanding the Various Categories

Injection molding is a widely used manufacturing process that involves injecting molten material into a mold cavity to produce a variety of plastic products. The molds used in this process play a critical role in shaping the final product. In this blog post, we will explore the different types of injection molds, their applications, and their significance in the manufacturing industry.

According to the different molding methods, it can be divided into different plastic processing mold types corresponding to different technological requirements, mainly injection molding mold, extrusion molding mold, blister molding mold, high foaming polystyrene molding mold and so on.

plastic injection (plastic) mold

It is mainly in the production of thermoplastic plastic products has been widely applied in the kind of forming dies, plastic injection mold and the corresponding equipment is plastic injection molding 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, driven by the injection machine nozzle and mould gating system into the mold cavity, cooling hardening plastic molding, Demoulding to get the product. Its structure is usually composed of forming parts, pouring system, guiding parts, pushing mechanism, temperature regulating system, exhaust system, supporting parts and so on. Plastic mold steel modules are usually used as manufacturing materials, and the commonly used materials are mainly carbon structural steel, carbon tool steel, alloy tool steel, high-speed steel and so on. Injection molding processing method is usually only suitable for the production of hot plastic products, plastic products produced by injection molding process is very wide, from daily necessities to all kinds of complex machinery, electrical appliances, vehicle parts are molded by injection mold, it is the most widely used in the production of plastic products a processing method.

The most common type of injection mold is the plastic injection mold, used to create a wide range of plastic products. This mold consists of two halves, the cavity, and the core, which are precision-machined to create the desired shape of the final product. The molten plastic material is injected into the cavity, and once it cools and solidifies, the mold opens, and the finished product is ejected.

Plastic injection molds are highly versatile and can produce products of various sizes and complexities. They are used in industries such as automotive, electronics, consumer goods, and medical devices. As an expert in the field, I have designed and utilized plastic injection molds to meet specific requirements and achieve high-quality products.

Types of Injection Molds: Understanding the Various Categories

Plastic pressing mould

Including compression molding and injection molding two structural mold types. They are mainly used to mold thermosetting plastics, and the corresponding equipment is a pressure molding machine. Compression molding method according to the characteristics of plastic, heat the mold to the forming temperature (generally in 103° -108 °), and then put the measured good pressure powder into the mold cavity and feeding chamber, close the mold, plastic in high heat, high pressure under the action of softening viscous flow, solidify after a certain time, become the required product shape. The difference between injection molding and compression molding is that there is a separate feeding chamber, the mold is closed before forming, and the plastic is preheated in the feeding room to show viscous flow, and it is adjusted and squeezed into the mold cavity under the action of pressure and hardened forming. Compression molds are also used to form some special thermoplastics such as refractory thermoplastics (such as polyfluorinated ethylene) blanks (cold molded), resin lenses with high optical properties, slightly foaming nitrocellulose automotive steering wheels, etc. The press mold is mainly composed of a cavity, a feeding cavity, a guiding mechanism, a pushing part, a heating system, etc. Injection molds are widely used to package electrical components. The material used in the manufacture of the pressing mould is basically the same as that of the injection mould.

Plastic pressing molds, also known as compression molds, are used to form materials like thermosetting plastics and rubber. This type of mold involves placing the raw material into an open mold cavity and then closing it under pressure and heat. The pressure and heat cause the material to take the shape of the mold cavity.

Plastic pressing molds are commonly used in the production of items like gaskets, O-rings, and electrical insulators. The advantage of using this type of mold is that it allows for the production of intricate and precise parts with excellent dimensional stability.

Plastic extrusion die

A type of mould used to form and produce continuous shape plastic products, also known as extrusion molding machine head, widely used in the processing of pipes, bars, monofilaments, sheets, films, wire and cable cladding, profiles, etc. The corresponding production equipment is plastic extruder, whose principle is that solid plastic is melted and plasticized under the conditions of heating and rotating pressure of the screw of the extruder, and continuous plastic products with the same cross section and the shape of the mouth die are made through a specific shape of the mouth die. Its manufacturing materials mainly include carbon structural steel, alloy tools, etc., and some of the extrusion dies will be embedded with wear-resistant materials such as diamond on the parts requiring wear-resistance. Extrusion process is usually only suitable for the production of thermoplastic products, and its structure is significantly different from injection mold and pressure mold.

Plastic extrusion dies are used in the extrusion process to produce continuous profiles with consistent cross-sections. In this process, plastic material is forced through a die, which gives it the desired shape and size. The extruded material is then cooled and cut to the desired length.

Plastic extrusion dies are used in various industries, including construction, automotive, and consumer goods. As an authority in the field, I have designed and manufactured extrusion dies to produce a wide range of plastic products with high efficiency and accuracy.

Plastic blow molding tool

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 main form according to the process principle of extrusion blow molding hollow molding, injection blow molding hollow molding, injection stretch blow molding hollow molding (commonly known as “note” blowing), multi-story hollow blow molding, sheet molding hollow molding, etc. The equipment corresponding to blow molding of hollow products is usually called plastic blow molding machine. Blow molding is only suitable for the production of hot plastic products. Blow molding mold structure is relatively simple, the material used to make more carbon

Blow molding is a process used to create hollow plastic parts, such as bottles, containers, and automotive components. A plastic blow molding tool, also known as a blow mold, is used in this process. The mold consists of two halves, and the molten plastic is placed in the mold cavity. Compressed air is then blown into the mold, causing the plastic to take the shape of the mold.

Plastic blow molding tools are essential in the packaging industry and have applications in various other sectors as well. With my experience and expertise, I have designed and manufactured blow molds to meet specific requirements for various clients.

Plastic Injection Molding Services | Injection Molding Factory In China
Plastic Injection Molding Services | Injection Molding Factory In China

Plastic blister mold

Is a plastic plate, sheet as raw material forming some relatively simple plastic products of a mold, its principle is to use the vacuum blooming method or compressed air molding method to fix on the concave die or punch plastic plate, sheet, deformation in the case of heating softening and stick on the cavity of the mold to get the required molding products, Mainly used for some daily necessities, food, toy packaging products production. The pressure of the blister mold is low when forming, so the mold materials are mostly made of cast aluminum or non-metallic materials, and the structure is relatively simple

Blister molds are used to create plastic blister packs, which are commonly used in packaging small items like electronics, toys, and medical products. A blister mold consists of a mold cavity and a backing plate. The plastic material is heated and formed over the backing plate to create the blister shape.

Blister molds are widely used in the retail and pharmaceutical industries for their cost-effectiveness and ability to protect and display products. With my knowledge and experience, I have designed blister molds that meet the highest standards of quality and precision.

High foaming polystyrene molding mold

It is a kind of mold that uses the raw material of developable polystyrene (beaded material composed of polystyrene and foaming agent) to form the foam It is a kind of mold that uses the raw material of developable polystyrene (beaded material composed of polystyrene and foaming agent) to form the foam packaging material of various desired shapes. The principle is that the polystyrene can be steam formed in the mold, including simple manual operation mold and hydraulic press straight-through foam mold two types, mainly used to produce industrial products packaging products. The moulds are made of cast aluminum, stainless steel, bronze, etc.

High foaming polystyrene molding molds are used to create expanded polystyrene (EPS) products, commonly known as foam packaging or Styrofoam. In this process, polystyrene beads are heated and expanded using steam to create a foam material, which is then molded into the desired shape using a mold.

EPS products are widely used in the packaging industry for their lightweight and excellent insulating properties. As an expert in the field, I have designed high foaming polystyrene molding molds that ensure consistent and precise shaping of EPS products.


In conclusion, injection molding is a versatile and essential manufacturing process used in various industries. Understanding the different types of injection molds and their applications is crucial for achieving high-quality and cost-effective production. As an authority in the field of injection molding, I have witnessed the impact of these molds on the manufacturing industry and have utilized my expertise to design and manufacture molds that meet the unique needs of clients and industries. Whether it’s plastic injection molds, pressing molds, extrusion dies, blow molding tools, blister molds, or high foaming polystyrene molding molds, each type plays a vital role in shaping the products we use in our daily lives.

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