METHOD OF PURGING FOR AN INJECTION MOLDING MACHINE
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United States of America Patent
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Issued Date -
Nov 19, 2015
app pub date -
May 18, 2015
filing date -
May 19, 2014
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Abstract
A switching purging step (S6 to S13) is provided as a purging process step. The switching purging step (S6 to S13) includes a former purging step (S7) and a latter purring step (S9 to S13) executed after the former purging step (S7). The former purging step (S7) includes introduction of a second molding material R2 into an injection device 1i, and metering operation and purging operation repeated a given number of times. The latter purging step (S9 to S13) includes a metering purging process (S9) and an empty purging process (S11) performed a number of times corresponding to a given repeat count. The metering purging process (S9) includes metering operation with a metering value smaller than that of the former purging step (S7) and purging operation repeated a given number of times. The empty purging process (S11) is performed after the metering purging process (S9). The empty purging process (S11) includes empty purging operation of making a screw retreat and then advance while the screw is not rotated and is repeated a given number of times.
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