Contaminant detection in the production of plastic compounds

The use of a number of raw materials from different suppliers is common in the compound industry. As a result, there are many potential sources of contaminants. Our metal detectors and separators protect your production equipment and assure product quality.

Sesotec specializes in systems for industrial contaminant detection and has more than 40 years of experience in the plastics industry.

We provide a complete range of leading technology that includes metal detectors and magnet systems for the reliable detection and removal of contaminants in a wide variety of applications. Our systems can target ferrous metals, stainless steel and non-ferrous metals, such as aluminum, copper and brass − regardless of whether the metals are magnetic or not, coated, painted, loose or embedded in material.

Sesotec's strengths

over 40 years of experience and reliability

Personal support in the after-sales area


Long-term reliability for spare part supply



Why is it important to detect and eliminate contaminants in the production of plastic compounds?

It is crucial to detect and eliminate contaminants in order to protect important, expensive machinery and assure product quality. From masterbatch and various additives to recycled and other materials, the sheer number of different raw materials from a wide range of suppliers increases the risk of contamination. Metal particles in particular can quickly cause damage to plasticizing screws and cylinders, and block melt filters and nozzle tools. Any one of these things can halt production and lead to downtime and repair costs.  

Particles that end up in the product reduce their quality, which is why customers expect metal-free compounds. With our metal detection systems, which are also able to reliably detect and remove non-magnetic particles embedded in a product, you can prevent customer complaints and boost your competitiveness.

Product example RAPID PRO-SENSE

What kinds of contaminants could appear?

Metals such as iron, stainless steel and copper very often interfere with the production of compounds. They make their way into the manufacturing process at various points:

  • The input materials can be contaminated
  • Pieces of metal from machinery or pipes can end up in the product through slough and wear
  • Contaminants can make their way into open material containers
  • Staff can lose hold of personal items, such as pens or rings


Where do manufacturers of plastic compounds use our machines?

One common application is the inspection of granules. Such inspections are a sensible course of action in various process steps:

  • Checking incoming goods
  • During production in conveyor pipes, right at the material inlet of an extruder, after a screening machine, etc.
  • Checking outgoing goods (before or after packaging)


We have standardized systems for a wide range of applications and would be happy to advise you personally to help you find the best solution for the set-up of your processes!


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