Abstract
The following paper includes an investigation of the geometric variation of plastic workpieces in a simulated environment of normal climate by 21° / 50% relative humidity. In the industrial manufacturing, the daily quality checks are required to determine, if the plastic workpieces can be released. Due to the humidity or water absorption, the plastic workpiece grows so far that the dimensional accuracy is not given. In this investigation, the results of 12 weeks are determined and presented.
Highlights
It is necessary to carry out daily quality checks to determine whether plastic workpieces can be released
Due to the absorption of moisture or water, the plastic workpiece expend in a way in which the dimensional accuracy can no longer be controlled
In many areas and departments, competent experts deal with the problems of plastic material parts dimensional and geometrical instability
Summary
It is necessary to carry out daily quality checks to determine whether plastic workpieces can be released. Due to the absorption of moisture or water, the plastic workpiece expend in a way in which the dimensional accuracy can no longer be controlled. This often leads to unnecessary parameter changes on the tool, which the tool maintenance department has to carry out. In order to obtain a reproducibility of the measured values and to be able to make reliable quality decisions, it is necessary to know how much a plastic part can hygroscopic ally expand at all and which properties influence it
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