Folded paper edge opening process
US4194342A · kind A · utility
0Cited by
9References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Sep 27, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S83/912
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A process is provided for the opening of envelopes made of cellulosic paper in which there is applied to at least one envelope edge as the sole reactant with the cellulose therein a non-noxious organic acid having at least one pK value at room temperature between about 1.5 and about 5, followed by the application of heat and mild mechanical action to the envelope edge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.