Method for the production of expandable plastics granulate
US6783710B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1998 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | May 20, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/17
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Apparatus and method for the production of expandable plastics granulate (C). A plastics melt (A′) is impregnated by a fluid blowing agent (B), which is, at an elevated pressure within a predetermined pressure range, only partly soluble in the melt. The method comprises the following steps: 1. dispersion of the blowing agent in the melt, 2. retaining of the mixture within a predetermined pressure range for a predetermined retention time, 3. cooling of the melt impregnated by the blowing agent to a temperature which is several degrees Celsius above the solidification temperature of the melt, and 4. granulating the cooled mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.