Advantages of in-line gear pump straining

Posted by LMI Custom Mixing on Dec 13, 2017 2:00:00 PM

Custom rubber mixers use many technologies and processes to help prevent undispersed materials and foreign particle contamination.

One such process is in-line gear pump straining, which improves final product quality by filtering contaminants during the mixing process.

Material entering gear pump

Gear pumps use two counter-rotating gears to push rubber compound through a temperature-controlled chamber. The material is then strained through a fine-mesh screen pack before exiting through a die head and formed back into strips.

LMI has in-line gear pump units on each of its three mixing lines that are fed directly from the strip mill. As material is fed through the gear pump, the temperature controlled chamber ensures a low material temperature increase despite high pressure within the gear pump.


This process purifies the rubber without changing or damaging the compound. This makes in-line gear pump straining ideal for purifying both master batch and compounds with cure.


In-line gear pump straining creates a unique advantage for material processing. For the mixer, it adds flexibility in raw material selection and improves overall compound quality.

For the part fabricator, it reduces issues during processing (such as extrusion, molding or calendering), and it provides a predictable and stable continuous output of final parts with fewer overall defects. This reduces scrap, and in turn, lowers the overall cost of production.

To learn more about the advantages of in-line gear pump straining, download our Corporate Brochure or contact LMI’s technical team.

Download Corporate Brochure