Corrugated board structure
US5842315A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Mar 24, 1997 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Mar 24, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24777
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A corrugated board structure including an upper layer of corrugated board, a bottom film and a middle layer of PU foam. Each side of the bottom PVC film is formed with an inward bent upright folded wall which, during the foaming and expansion procedure of the PU foam, restricts the foaming space so as to continuously produce solid foam structure. The middle PU foam makes the upper and lower layers tightly adhered to each other as an integral body. An edge of the projection on one side and an edge of one of the front and rear ends is free from any PU foam and bottom film so that two adjacent corrugated boards can be overlaid and connected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.