Screw for injection molding machine, injection molding machine, and injection molding method
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United States of America Patent
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Sep 8, 2020
Grant Date -
Dec 14, 2017
app pub date -
Jan 15, 2015
filing date -
Jan 15, 2015
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Provided is a screw that is for use in an injection molding machine and that makes it possible to benefit from the kneading effect of a multi-start screw while minimizing the received friction resistance. The screw for an injection molding machine is provided with a first stage 20 on the upstream side and a second stage 30 on the downstream side. The screw for an injection molding machine is characterized in that: the first stage 20 is provided with a compression section 22 comprising a main scraper 25 and an auxiliary scraper 26 having a smaller outer diameter than the main scraper 25; and the second stage 30 is provided with a multi-start screw section 31, said multi-start screw section being provided on the upstream side and comprising a plurality of scrapers, and a fin kneading section 32 provided downstream from the multi-start screw section.
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