Plasticizing screw for injection molding and injection molding method using same
US8900506B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2010 |
| Grant date | Dec 2, 2014 |
| Priority date | — |
| Expiry date | Mar 16, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/60
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plasticizing screw for injection molding according to the present invention is installed in an injection molding machine that performs injection molding by plasticizing thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a main flight, and a sub-flight. The protrusion height of the main flight from the circumferential surface of the shaft is formed to be constant in at least an area in which the sub-flight is provided. The sub-flight includes a flat surface portion which is provided on the rear end side in a winding direction and in which a protrusion height from the circumferential surface of the shaft is lower than that of the main flight and is constant, and an inclined surface portion which is provided to extend continuously from a leading end in the winding direction of the flat surface portion and in which a protrusion height from the circumferential surface of the shaft gradually increases toward the leading end side in the winding direction and is less than the protrusion height of the main flight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.