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What is Injection Molding?
What is Injection Molding?

What is Injection Molding?

In this beginner's guide to Injection Molding, we cover the basic principles of the technology. After reading this article you will understand the fundamental mechanics of the Injection Molding process and how these relate to its key benefits & limitations.

What is Injection Molding?

Injection Molding is a manufacturing technology for the mass-production of identical plastic parts with good tolerances. In Injection Molding, polymer granules are first melted and then injected under pressure into a mold, where the liquid plastic cools and solidifies. The materials used in Injection Molding are thermoplastic polymers that can be colored or filled with other additives.

Almost every plastic part around you was manufactured using Injection Molding: from car parts, to electronic enclosures, and to kitchen appliances.

Injection Molding is so popular, because of the dramatically low cost per unit when manufacturing high volumes. Injection molding offers high repeatability and good design flexibility. The main restrictions on Injection Molding usually come down to economics, as high initial investment for the is required. Also, the turn-around time from design to production is slow (at least 4 weeks).

In this article, we will first see how injection molded parts are made and we will examine the basic characteristics of the process that are important to keep in mind when you design a part for Injection Molding. Next, we will delve deeper into the mechanics of the technology to understand how these are connected to its economics (through an example) and its key benefits and limitations.

 

Injection Molding is a manufacturing technology for the mass-production of identical plastic parts with good tolerances

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