Screw for injection molding machine, injection molding machine, and injection molding method
US10766178B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 15, 2015 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Apr 14, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.