Introduction to some knowledge points of Cold Runner Mold!

Cold runner moulds are the less complex option to hot runner molds. They also have lower maintenance costs, which are a good option for smaller production volumes.

Typically, the cold runner system is made up of two or three plates that carry molten plastic to the mold cavities, while cooling multiple components and the molded part. There are also slightly different variations in this process, known as insulated runners, which keep the plastic in a molten state.

The runner is a key component of the injection molding process and affects many aspects of the end product, including pack size, filling pressure, shrinkage and warpage. Its location within a cavity can significantly impact how the molded parts form, and it has a direct influence on shear induced melt variations that can create temperature changes of over 100F.

There are two main types of cold runner systems: internally heated and externally heated. Internally heated molds have a manifold system that heats the entire mold, while externally heated systems only need to provide heating for the runner channels.

When choosing between these two, the first thing to consider is what type of materials you will be using. This will determine whether a cold or hot runner system is better for you.

If you’re using polymers or other heat-sensitive materials, a cold runner is probably your best bet. This is because it’s easier to work with and doesn’t need to be heated, which is ideal for some of the more sensitive plastics out there.