Injection mold manifold arrangement
US4950143A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Jan 3, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2949/3032
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
It has been found that when layered preforms are being injection molded utilizing at least two materials, it is possible to maintain the same horizontal and vertical pitch of adjacent cavities as is possible when each mold cavity is being filled with a single material. Most particularly, it has been found that when the percentage of the material to be injected into a mold cavity is relatively high, it is possible to utilize a single metering pot for four adjacent mold cavities. On the other hand, if one of the materials to be injected into a mold cavity constitutes a relatively low percentage of the volume of a mold cavity, it has been found that a small metering pot must be provided for each of the cavities of the four cavity mold. Most particularly, with this combination, it is possible to maintain the pitch of the single material mold and thereby maintain the small size of existing injection systems as opposed to an increase in the pitch of the mold cavities which would increase the size of the mold structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.