Method and apparatus for producing a foam from a molten thermoplastic material
US4791142A · kind A · utility
16Cited by
18References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1987 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Aug 5, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/26
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for creating molten thermoplastic material foam by separately pressurizing the molten thermoplastic material and a gas and by delivering that material and gas sequentially to a premixing chamber, through a sintered metal insert and a post mixing chamber, to a discharge orifice of a spray nozzle. The apparatus for practicing this method comprises a nozzle assembly, including a nozzle adaptor and a nozzle, the adaptor of which has flow passages for delivering the pressurized gas and molten material to a premixing cavity and subsequently to and through a sintered metal insert contained within the nozzle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.