Molding nozzle gate valve
US6419116B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2001 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Feb 27, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/2889
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A molding nozzle controls the flow of material from a source of plastic melt to an outlet that communicates with a gate to a mold cavity. The nozzle contains a valve pin that includes a guide section and a valve end, and is movable toward and away from the gate to open and close the gate selectively. The valve pin is guided for movement by guide surfaces on inwardly-extending vanes within the nozzle, such that the guide surfaces engage the guide section of the valve pin. The valve end of the valve pin has a smaller diameter than that of the guide section, so that the valve section is free-floating to allow annular flow in the guide surface region to minimize the likelihood of formation of flow lines in the molded part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.