System and method for preserving valve member travel in a multi-nozzle extruder
US11000997B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 2018 |
| Grant date | May 11, 2021 |
| Priority date | — |
| Expiry date | Aug 7, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2905/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extruder has a valve assembly configured to move pins to open and close the nozzles in a multi-nozzle extruder head independently. The pins of the valve assembly that are driven by actuators into and out of engagement with nozzles in the extruder head are positioned within sleeves that extend between the valve assembly and the extruder head. A gap is provided between the extruder head and the end of the sleeves proximate the extruder head to enable thermoplastic material leaking from the extruder that contacts the pins to remain in a melted or plastic state so the thermoplastic material does not interfere with the movement of the pins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.