Movable molten mass guide sleeve to compensate for temperature-dependent expansion between the hot channel and the mold feed orifice
US6390803B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1999 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Sep 20, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/2761
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A dynamic molten mass guide sleeve disposed to articulate to compensate for differences in expansion between an inner hot flow hot channel injection and mold cavity with air gap insulation therebetween. Prior fixed molten mass guide sleeves required extremely stringent location deviations and often led to mold cavity ruptures or leakage as a result of differential expansion between the nozzle body having the hot flow channel and the mold cavity channel. The inventive sleeve is fitted with peripheral sealing lips at each end and is mounted between the body having the hot flow channel and the mold cavity (6). The sleeve compensates for differential heat expansion while enabling well-defined temperature separation in the mold feed orifice area of the injection mold by sealing the air gap (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.