Method of manufacturing a molding for energy absorbent pads and mold used in the method
US5667741A · kind A · utility
2Cited by
1References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1996 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Apr 4, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C44/3403
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed herein is a method of manufacturing a rigid polyurethane foam molding for energy absorption, including the steps of introducing a rigid polyurethane foam raw material composed primarily of a polyhydroxy compound and a polyisocyanate compound into a cavity in a mold, and blowing and reacting the rigid polyurethane foam raw material in the cavity, wherein a pack ratio of a core portion of the molding ranges from 0.5 to less than 1.2. Accordingly, the rigid polyurethane foam molding can obtain a plateau value comparable to that of a rigid polyurethane foam slab stock foam suitable for an energy absorbent pad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.