Melt pump seal with vacuum housing
US4447061A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Jun 4, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/904
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and apparatus for preventing fluid leakage through a sealing mechanism of a melt pump into a vessel during the period of establishing a vacuum therein and increasing the viscosity of the material fed thereto. The method includes enclosing in a fluid-tight relationship the area of fluid leakage adjacent the sealing mechanism and reducing the pressure in the enclosed area sufficiently to prevent the fluid from leaking. The apparatus includes a rigid housing which encloses in fluid-tight relationship the area of fluid leakage adjacent the sealing mechanism, a vacuum generating device, and means for connecting the vacuum generating device with the enclosed area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.