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Keywords of this article:  dryer 
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extrusion 
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KP Linpac recently bought the third Infrared Rotary Drum from KREYENBORG.
KP Linpac recently bought the third Infrared Rotary Drum from KREYENBORG.

KP Linpac, the manufacturer of high-quality food packaging materials, has just placed an order for the third Infrared Rotary Drum (IRD) of KREYENBORG GmbH & Co. KG, located in Senden, Germany. The third IRD will be delivered at the beginning of 2019.

In Germany, KP Linpack produces PET sheet and, in a second step, thermoformed trays for foodstuff at both its company sites Ritterhude and Beeskow. With this new equipment, KP Linpack expands its production capacities for thermoformed PET packaging solutions at the company site in Beeskow substantially.

Arno Jansen, Project Extrusion Manager at KP Linpack, said after successful trials effected in the test facility in Senden: “The possibility to crystallize and dry virgin material and ground stock in a first process step quickly and efficiently, fits into our production plants perfectly.”

Particularities of multilayer sheet applications

An IRD for KP Linpack achieves a continuous drying capacity of 800 kg/h. In these IRDs, the material fed in is circulated and conveyed on a permanent basis due to the rotary movement of the tube.

The low filling level in combination with the high circulating speed make the IRD a very efficient crystallization and drying unit, which does not only work more quickly than ordinary desiccant air dryers, but also needs less energy and is much more flexible as regards the materials used, as explained by Marcus Vogt, Project Manager in Charge at Kreyenborg.

To KP Linpac, flexibility means to be able to process not only ground punching scrap, but also edge trims from sheet production and variable mixtures from both of them. Infrared light ensures material heating in the IRD, virtually from inside out.

In this way, a crystallization effect is achieved at roughly 135°C in the first step and material drying is achieved at roughly 170°C in the second step. The final result achieved is a perfectly prepared input material to be used for renewed film production.

The fact that KP Linpac produces PET film with a sealing layer made of PE does not represent any problem in this respect. The non-stick coating of the IRD prevents the risk of the lower melting PE keeping stuck with the tube coils and the constant mixing ensures that the material remains free flowing and can be fed back again into the extrusion process without any problems.

On the other hand, flexibility also means that material changes, for example in case of a color change, can be carried out quickly and in an uncomplicated manner. Another crucial advantage is that the IRD is completely cleaned within only two hours and can be used again immediately by simply using a start-stop button.

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