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There are a very few places where you can find mold making tutorials and resources for free. So if you’re serious about learning to make injection molds then you came to the right place.

Here, you can find basic concepts with illustrations on how to design and make injection molds. This site will be regularly updated to give you fresh plastic industry news, new tricks that I’ve recently discovered, tutorials, mold making HOWTO’s, and random articles about plastic injection molding resources.

… “Where should I start?”
I have tried to include as much detail as possible on how to design molds and how to make them on this website. Please bookmark(Ctrl+D) this site to give yourself useful references as you begin your journey to become an expert mold maker. If you have any questions regarding any of my articles, feel free to ask and I will try and respond to you as soon as I can. Also, if you find any misleading or questionable articles, or you want to contribute useful information, please contact me. Below are some of the topics that I’ll cover in depth.

How does injection molding works? – The basics of injection molding.
How to design a mold? – Mold design tips, tutorial, and CAD product built for mold design.
What are the different types of gates and runners? – I have shown illustrations here.
Mechanism of injection molds? – I have illustrated movements of injection molds and their most common components.

What is Injection Molding

Posted on November 30, 2005 by Elito

Injection molding is an economical and very efficient method of producing injection molded parts. It can produce millions of parts with exactly the same shape, dimension, and quality. Some examples of injection molded parts are the mobile phones, mouse, keyboard, … Continue reading →

Cooling the Mold

Posted on September 30, 2011 by Elito

This explains the WHY, WHAT, HOW and WHERE of mold temperature control.

Why do we need to control the mold temperature?

The mold temperature has significant impact on molding cycle, dimensional accuracy of molded part, and warping of molded part.

If the mold temperature is too cool, the runner and gate will solidify before the resin could completely fill up the cavity. However, if the mold temperature is too hot, the resin will take more time to solidify affecting the molding cycle time. If some portions of the molded part solidify a lot faster than the other portions, chances are warp or deformed molded part –the dimensional accuracy cannot be satisfied.

What are the methods of controlling the mold temperature?

There are 3 methods to control the temperature of the mold. It depends on the temperature range that the mold will be set for production.

1. Water: 40~90?

2. Oil: 80~120?

3. Heater cartridge: 120? and over.

How and where should we apply the mold temperature control?

The purpose is to control the temperature of the cavity and core so keep the cooling line (water hole) close and evenly placed around the molded part. The image below shows the ideal placement of water hole. But this is only a general rule -mold structure, manufacturability, and ease of maintenance are to be considered.

Injection Mold Making and Molding

Resources for injection molders and mold makers.

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What is Injection Molding

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Cooling the Mold