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Why Do Plastic Injection Molds Cost So Much?

2023-06-07
Latest company news about Why Do Plastic Injection Molds Cost So Much?

Why Do Plastic Injection Molds Cost So Much?

People often ask why plastic injection molds cost so much? Here is the answer:

Producing high quality plastic parts can only be achieved by using a high quality built mold. Molds for plastic injection consist of precisely machined components made from various metals such as aircraft grade aluminum or hardened mold steels.

These molds are designed and made by highly skilled and well paid people categorically called “mold makers”. They have spent years and possibly even decades being trained in the mold making trade.

Additionally, mold makers need very expensive tools to perform their job, such as very expensive software, CNC machinery, tooling, and precision fixtures. The amount of time that mold makers need to finish a plastic injection mold can range from a few days to several weeks depending on the complexity and size of the end product.

Mold Construction Requirements

In addition to the costs that are associated to molds from the skilled people and machinery that make them, the construction requirements for an injection mold to function properly during the injection molding process is quite astounding. Although the molds are summarized as halving “two halves”, a cavity side and a core side, there are often dozens of precision parts that make up each half.

Almost all of the precisely machined mold components that will come together and function to manufacture your custom molded parts are machined to tolerances of +/- 0.001″ or 0.025mm. A standard piece of copy paper is 0.0035″ or 0.089mm thick. So just imagine slicing your copy paper into three ultra-thin pieces as a reference to how precise a mold maker needs to be to properly build your mold.

Mold Design

And finally, the design of your plastic injection mold has a very large impact on its cost. The plastic injection molding process requires enormous amounts of pressure when the plastic is injected into the mold cavities by the machine. Without these high pressures the molded parts will not have nice surface finishes and potentially will not be dimensionally correct.

Mold Materials

In order to withstand the pressures your mold will see during the injection molding process it must be made with high quality aluminum and steel grades, and be designed to withstand clamping and injection forces that can range from 20 tons for a small precision part to thousands of tons for a residential recycling bin or garbage can.

Lifetime Warranty

Whatever type of plastic injection mold you need, we understand that your injection mold purchase will become a significant asset to your business. For that reason, we warranty the production life of molds we build for our customers for the life of their production requirements.

We hope this information helps you better understand plastic injection mold construction and their cost. Remember the quality of your custom plastic parts will first depend on the quality of your mold. Let us quote your next injection molding project and we will work closely with you to make your project a success!