DK517082A - PRESSURE TREATMENT AND STORAGE OF THERMOPLASTIC RESIN FOAM FOR SECONDARY EXPANSION - Google Patents
PRESSURE TREATMENT AND STORAGE OF THERMOPLASTIC RESIN FOAM FOR SECONDARY EXPANSION Download PDFInfo
- Publication number
- DK517082A DK517082A DK517082A DK517082A DK517082A DK 517082 A DK517082 A DK 517082A DK 517082 A DK517082 A DK 517082A DK 517082 A DK517082 A DK 517082A DK 517082 A DK517082 A DK 517082A
- Authority
- DK
- Denmark
- Prior art keywords
- secondary expansion
- foam
- density
- thermoplastic resin
- resin foam
- Prior art date
Links
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Method of reducing the density of an essentially closed cell thermoplastic resin foam material by secondary expansion thereof. The method consists in increasing the gas pressure inside the cells, maintaining the increased cell pressure for an extended length of time and thereafter heating the foam material to a temperature in excess of its hot plastification temperature in order to bring about secondary expansion thereof. In one example the low-density polyethylene material was expanded to produce a foam having a density of approximately 0.085 g per cm<3>. This foam was then pressurized with nitrogen and subsequently underwent secondary expansion to produce a foam with a density of approximately 0.036 g per cm <3>.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK517082A DK151945C (en) | 1982-11-19 | 1982-11-19 | PROCEDURE FOR THE PREPARATION OF A THERMOPLASTIC RESIN FOAM MATERIAL WITH SECONDARY EXPANSION GETS REDUCED SPACE WEIGHT |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK517082A DK151945C (en) | 1982-11-19 | 1982-11-19 | PROCEDURE FOR THE PREPARATION OF A THERMOPLASTIC RESIN FOAM MATERIAL WITH SECONDARY EXPANSION GETS REDUCED SPACE WEIGHT |
DK517082 | 1982-11-19 |
Publications (3)
Publication Number | Publication Date |
---|---|
DK517082A true DK517082A (en) | 1984-05-20 |
DK151945B DK151945B (en) | 1988-01-18 |
DK151945C DK151945C (en) | 1988-06-06 |
Family
ID=8140085
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK517082A DK151945C (en) | 1982-11-19 | 1982-11-19 | PROCEDURE FOR THE PREPARATION OF A THERMOPLASTIC RESIN FOAM MATERIAL WITH SECONDARY EXPANSION GETS REDUCED SPACE WEIGHT |
Country Status (1)
Country | Link |
---|---|
DK (1) | DK151945C (en) |
-
1982
- 1982-11-19 DK DK517082A patent/DK151945C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DK151945C (en) | 1988-06-06 |
DK151945B (en) | 1988-01-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PBP | Patent lapsed |