New technology for WIT : WAB - Water Assisted Blowing

PME and Teklas Kaucuk developed a new innovative process for the production of the drain channel which combines the water injection technology (WIT) with the melt push back process and the blow molding technology with core puller technology  [WAB = Water Assisted Blowing].

The process works as follows:
The pipe injection mould offers variable cavity geometries in the areas of the bellows. During the melt injection phase the areas of the bellows have circular preform geometry. After the melt injection the hollow space is shaped by using the water injection process in combination with the melt push back procedure. This can be done on one hand exclusively with water or alternatively by using a projectile and WIT. As soon as the cavitation is completed, a controlled pressure decrease is carried out to realize a predefined cavity pressure value. If this is achieved, the automatic contour change of the preform to the final bellow geometry starts. This is realized by using the pressure-dependent control of volume flow rate. During the following controlled holding phase of the water pressure the cooling to the required demolding temperature of the polymer takes place. Finally the pressure drop and water return are carried out in order to demold the part waterless. Since end of 2011 the drain channel has been produced fully automatically with a two cavity mould.
Specific advantages are the stable and fully automated short process chain combined with extremely short cycle times and weight reduction due to the high integration of functions.

By the way: SPE Award Gewinner 2012 “GRAND INNOVATION AWARD (Powertrain)”


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