Post-treatment of humic acid-dyed paper
US4238283A · kind A · utility
5Cited by
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5Claims
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Key dates
| Filing date | Jun 4, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Jun 4, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/14
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Humic acid-dyed paper suitable for use as wrappers for smoking articles is post treated with magnesium sulfate to fix or render the humic acid insoluble. Paper treated in this manner provides a product of acceptable brown color. Smoking articles wrapped in the treated paper evolve a reduced amount of carbon monoxide on smoking under normal conditions in comparison to currently available brown papers stained with humic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.