Flushing process

The flushing process is always subsequent to one of the previous described processes and serves primarily to shorten the cooling time of the component. Fresh fluid becomes flushed steadily through the component to increase the thermal outflow. Although nowadays the process is also used with [cooled] gas, it is only economical and meaningful with water.

Due to the high rate of gas which is required, the cost advantages of the shorter cycle times are mostly cancelled out. At the water injection technology, the flushing process gets only used for material which has a very low demoulding temperature [e.g. PP or PE]. For fast crystallizing materials or materials with high fibre reinforcements [PA, PPA or PP with high fiber contents] the flushing process is not used.

 

In this case usually the cooling effect of the normal process water is sufficient here for the cavity formation. Further cooling is needless and would extend the cycle time and would also increase the effort for the component drying time and therefore the costs as well.

Suitability:
Particularly suited are handles, boxes and lids with reinforcements channels, covers, leads and similar parts which are produced with PP, PE or other slowly solidified materials.

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