Method of providing closed-cell polyolefin foam having reduced blowing agent content to the end user
US5124097A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1991 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Feb 8, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/046
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of providing closed-cell polyolefin foam having reduced blowing agent content to an end user including (a) extruding the polyolefin to form the essentially continuous foam structure defining a multiplicity of channels extending generally longitudinally therethrough; (b) intermittently crimping the essentially continuous foam structure such that the channels extending therethrough are intermittently substantially closed off; (c) intermittently severing the essentially continuous, intermittently crimped foam structure at the crimps therein to form discrete foam structure portions having crimped end portions; (d) cooling the crimped, discrete foam structure portions to an extent sufficient to prevent substantial shrinkage of the crimped, discrete foam structure portions upon initiation of release of the flammable blowing agent from the foam; (e) excising the crimped end portions from the remainder of the crimped, discrete foam structure portions to initiate release of the flammable blowing agent and form uncrimped, discrete foam structure portions; and (f) providing the uncrimped, discrete foam structure portions to the end user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.