Understanding the Differences Between Direct and Indirect Extrusion


Let’s say you have lots of time and big production line, it may be worth the investment to set up a complete extrusion manufacturing process. This can lengthen round-trip costs, increase sale prices and produce less waste than other methods. Of course, this has always been a significant debate in entire manufacturing industry currently with new trends emerging every day.

What does Direct Extrusion Mean?

Extrusion describes the seamless connection of plastic materials at a given angle or the use of a machine to carry out this process. Direct extrusion enables a blank to be formed directly from the material with an aspect ratio of G1 / G2 and is therefore also known as “ongoing initial build-up”. In indirect extrusion, several layers change the blank

Benefits of Direct Extrusion in Production

When materials are heated, they expand and plastically deformation occurs. Direct extrusion is the type of “extrusion” where these materials are mechanically pushed or forced through a die that forms the shape. Indirect extrusion is when the cold material is melted and “injected” (expanded) into a die. With direct extrusion, there are fewer problems with steel particles and less quality control issues.

What are the Advantages of Indirect Extrusion?

You can get higher quality resin when using an indirect extrusion process. This is helpful because the particles are less likely to clog, and they also don’t exude any heat. Unlike direct extrusion processes, the heat generated in an indirect extrusion process will not be transferred to the molding machine or filament spool. Price of parts, total waste volume, and leach time can all be significantly reduced using this process.

Disadvantages of Indirect Extrusion

With indirect extrusion, the extruded material gets a pass through coils of tubing and collects in a tube that is much larger than the one that carried it in. The large reservoir is filled by feeding the material into a hopper and quickly out of the end of the hot end onto several cold fingers and then into another round coil in which it uncoils to travel over to the part being molded on.
Toxicity: When new silicone compounds are used in prototype applications, they tend to release silica, which creates silica dust when tiny particles hit your skin-even while wearing gloves.

Commonly used heat treatment methods

Direct Extrusion is used for softening and tempering metals… Indirect Extrusion includes one or more coatings, as well as high-temperature oxidation and dyeing processes.


The benefits of each of these forms of extrusion are quite different, but it may not be easy to know which one to go with in your manufacturing process. If a product is carefully made with both types and can be proudly displayed, anyone would walk away pleased.

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