Plastic injection molding connects with the basic need of people and manufacturers. And the things made from it are an important part of our lives. What is plastic injection molding?

Plastic injection molding is the best possible way to make plastic parts by injecting molten materials into the mold figures. The purpose of injection molding is to produce high volume chunks made up of plastic pellets. The other materials like glass, metals, and rubber blend with plastic pellets to innovate the latest objects.

This process invented by American Invertor, John Wesley Hyatt. He authorized the first plastic injection molding machine and the machine meets the need of the market. To bring about change, he took a step in the conversion of materials from ivory billiard balls to plastic pellets.


Plastic injection molding is one of the fast-moving production processes in the world. In the procedure of mold making, molds need a mixture of plastic, steel or aluminium.

Plastic industries use mold containers by using different processes such as injection molding, rotational molding, and blow molding to manufacture plastic parts.

Plastic molding proposes to give the desired shape to specific objects. It requires complex methods and an experienced team to perform. Melting point controls at specific temperature until plastic gets shrink under cooling point. Lack of management and wrong tools cause damage.

The main aim of tooling and plastic mold designing is to create high-quality products:


Tool steel is an essential material used in making molds. The selection of the right tool steel considers on the basis of heat treating and molding requirements. The steel hardness and dimensions of molds check at the initial step to measure the products parts. The cavity and core insert material involve hardened steel. Most of the steel used in manufacturing become hardened or pre-hardened steel. It maintains the balance between wear and toughness. To make good quality mold, hardened tool steel (H13, HRC 48-52) is the best choice.


There’re many formats such as 2D, 3D, BY .IGS .STP etc, for plastic mold design. Design

Determines the dimensions of mold and steel.


Injection molding is an industrial method used for the thermoplastic material. The

Chemical composition of raw materials doesn’t change throughout the heating process. Keeping in mind that, the design, colours, shape, quality of plastic pellets, and other recycled materials will examine at pre-processing stages of injection molding.

The brief process of injection molding is following:

  1. Melt the raw materials at a specific temperature.
  2. Inject the molten material into mold cavity by applying pressure.
  3. Reform and reproduce desired shape and design for the final product.
  4. Allow the molten material to cool and harden.
  5. Pull out the holder from the mold using an ejection pin.


While heating and cooling, the process of molding rotate to shape a molten liquid into solid products. Related to plastic, thermoplastic works well in this process.

Thermoplastic is common material preferred by the manufacturer. At high pressure, thermoplastic melts and solidifies under cool temperature. It can be re-heated and re- shaped if necessary.


The ability of plastic injection molding is to mass-produce all kinds of goods. In plastic industry, mass production includes musical instruments, automotive parts, electronic, chairs, bottles, crockeries, medical equipment, mechanical parts, storage container etc. The need for injection molding machines depends on the size of a mold at the time of production.

Understanding above processes, you can avail:

  • Consistent quality
  • Less plastic waste
  • Mass production
  • Low cost/ money-saving
  • Recycling materials
  • Blending many materials
  • Design complex parts

The uses of scientific procedures and strategies are straightforward in injection molding process. The quality of tools and designs determine the quality of plastic parts.

Throughout the whole process, the large number of productions expects in many forms. It’s based on how much effort we put into the mold making process to meet the best result.

By admin

Writing and blogging is my passion. Providing meaningful information to readers is my object.