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Keywords of this article:  dryer 
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KREYENBORG IRD has a wide range of applications, for example, to dry PTFE / SAN.
KREYENBORG IRD has a wide range of applications, for example, to dry PTFE / SAN.

KREYENBORG has offered a Far East company a unique solution of drying PTFE / SAN by means of the infrared dryer. The dried PTFE / SAN can now be used for further processing for the production of particularly stressed mobile phone backs.

The two components, PTFE (known under the brand name Teflon) and SAN (styreneacrylonitrile copolymer) are combined into one product in this process.

The challenge is that the PTFE / SAN mixture has a high stickiness and clumps very fast, according to KREYENBORG.

PTFE and SAN are "combined" by using KREYENBORG IRD (Infrared Rotary Drum) to form a product under the influence of heat and permanent and careful mixing.

In addition, the IRD is drying the PTFE / SAN within a few minutes, reducing the high water content from over 25% to approx. 0.3%.

The mixture is in constant movement inside the drum. Thus, during the drying process, a sticking of the material is prevented and at the same time a homogeneous energy input is ensured.

The process is greatly shortened by the particular efficiency of the infrared treatment, without affecting the colors.

The first material leaves the continuous IRD after about 20 minutes instead of the usual 3-4 hours required by a convective dryer. The PTFE / SAN is also ready for grinding due to the very low residual moisture.

The IRD dissolves clumps and restores the original grain size of bulk solids.

As introduced, advantages of drying polymers with high water content using the IRD Infrared Drum:

  • The application areas of the KREYENBORG IRD are almost unlimited. For example, the IRD is used to crystallize and dry virgin or regrind material for a variety of plastics.
  • By using the continuous IRD, the energy-intensive dry air treatment is completely eliminated.
  • Energy savings averaging 30% are so easy to achieve. Therefore, the IRD is especially suitable for applications with high and changing input moisture.
  • Prior to the application of the IRD, the PTFE mixture is a sticky, very lumpy mass. The IRD dries in minutes instead of hours. The raw material is conveyed uniformly through the machine and gently circulated by the rotation of the drum and heated very evenly. So clumps are excluded.
KREYENBORG has been manufacturing machines for mixing and conveying for over 60 years in the plastic, food and chemical industries.

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