Apparatus and method for multi-layer injection molding
US6648622B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1999 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Mar 22, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/273
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection molding apparatus and method for multi-layer molding of preforms and closures has a central melt channel, an annular melt channel radially spaced from the central melt channel, and an annular ring channel surrounding the central melt channel. The central melt channel has a first portion for flow of a first material, a second portion for flow of the first material and a second material, and a flow extension connecting the first portion and the second portion. The flow extension has a flow opening in communication with the annular ring channel for flow of the second material. The apparatus and method also include a cavity for receiving flow of the first material and the second material from the central melt channel, and for receiving flow of a third material from the annular melt channel. In addition, the apparatus and method include a first melt passage in communication with the annular melt channel, a second melt passage in communication with the annular ring channel, and a third melt passage in communication with the central channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.