Plastic Molding

Plastic mold is the mother of industrial production, is a very common industrial process one, but because of its complex production process and increasingly high precision requirements, making it has been kept relatively high mystery veil, we are a professional precision plastic mold manufacturing company in china, with more than 10 years of experience in precision mold manufacturing, professional design team and high-precision dimensional testing equipment, experienced assembly mechanics, making your mold accuracy and product dimensions continue to improve, through this blog, we will introduce step by step plastic mold industry materials, processes, heat treatment, EDM, CNC machining, Polishing, accessories, prices and so on.

The Injection Molding Process

The injection molding process consists of several stages, including material preparation, injection, packing, cooling, and ejection. Here is a brief overview of each stage:

Material Preparation

In this stage, the raw material is prepared for injection into the mold. The material is typically in the form of pellets, which are fed into a hopper and then transported to the heating chamber. In the heating chamber, the pellets are melted into a molten state, ready for injection.


In this stage, the molten material is injected into the mold cavity under high pressure. The injection process is controlled by a machine, which ensures that the right amount of material is injected at the right speed.


In this stage, the molten material is packed into the mold cavity to ensure that there are no voids or air pockets. This is done by applying additional pressure to the material in the mold cavity.


In this stage, the mold is cooled so that the material solidifies and takes the shape of the mold. The cooling time is determined by the material used and the thickness of the product.


In this stage, the finished product is ejected from the mold. The ejection process is done using pins or ejector plates.

Materials Used in Injection Molding

There are several materials used in injection molding, including:


These are the most commonly used materials in injection molding. They are versatile, easy to mold, and can be recycled. Examples of thermoplastics include polypropylene, polystyrene, and polyethylene.


These materials are used for products that require high temperature and chemical resistance. Examples of thermosets include epoxy, phenolic, and melamine.


These materials are used for products that require flexibility and durability. Examples of elastomers include silicone, rubber, and polyurethane.

Equipment Used in Injection Molding

There are several types of equipment used in injection molding, including:

Injection Molding Machine

This is the main equipment used in injection molding. It consists of a hopper, heating chamber, injection unit, and mold clamping unit.


This is the component that gives the product its shape. The mold is made of two halves and is designed to allow the molten material to flow into the mold cavity.

Hot Runner System

This is a system used to control the flow of molten material into the mold. It consists of a series of channels that distribute the material evenly into the mold cavity.


Injection molding is a complex process that requires careful consideration of materials, equipment, and process parameters. With this guide, you now have a basic understanding of the injection molding process, materials used, and equipment. If you are considering injection molding for your product, we recommend consulting with a professional to ensure that your product is manufactured to the highest standards.

Scroll to Top