Halogen-Based Drying of Plastics
Residual Moisture Determination for Everyone
Akro-Plastics GmbH, Niederzissen, together with Mettler-Toledo GmbH, Giessen, both Germany, performs comparative measurements between Karl Fischer titration (KF method) and the thermogravimetric method to determine the residual moisture with the aid of a halogen-based dryer. The impetus for this comes from the frequently occurring problem that the pellets are overdried prior to processing.
During the production process for plastics and compounds, the moisture content of the pellets is determined in the laboratory by the manufacturer by means of the KF method. While this is very accurate, it is also very involved, expensive and takes a long time. The halogen method is supposedly a simple and easy alternative. Experimental results to date are very promising and the partners are proceeding on the assumption of a good correlation between the two methods.
The distributor ensures that his material reaches the processor in a very dry condition. The compounds are packaged in aluminum-laminated polyethylene (PE) sacks and, according to the company, the material needs to be pre-dried or pre-heated for only two hours if it is removed directly from the undamaged container. This represents an energy and cost savings of up to 75 %.
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