Method for assessing wear in molding machine
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United States of America Patent
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Jul 19, 2016
Grant Date -
Feb 6, 2014
app pub date -
Oct 16, 2013
filing date -
Apr 28, 2011
priority date (Note) -
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Abstract
A first chromium mass concentration and a first reference mass concentration are extracted from a first test substance made by adding a predetermined amount of calcium to a predetermined amount of pellets; a reference value is calculated on the basis thereof. A second chromium mass concentration and a second reference mass concentration are extracted from a second test substance made by adding, to a predetermined amount of the substance contained in the molded part, an amount of calcium identical to the amount added to the pellets; a comparative value is calculated on the basis thereof. A screw can be determined to have wear whenever the comparative value is not less than a numerical value 60 times that of the reference value, whereas the screw can be determined not to have wear whenever the comparative value is less than a numerical value 60 times that of the reference value.
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