Method of making paper having improved tearing strength
US4609432A · kind A · utility
12Cited by
9References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1984 |
| Grant date | Sep 2, 1986 |
| Priority date | — |
| Expiry date | Jun 15, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/42
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The tearing strength of paper is improved by providing a furnish in which the fiber content is predominantly refined fiber with a minor amount, preferably 2 to 10 wt. %, of added unrefined fiber having incorporated therein a heat activatable bonding agent, particularly starch. The bonding agent adheres to and coats the added fiber without chemically reacting with the fiber. A cationic material, particularly polyethyleneimine, is premixed with the raw starch to cause it to adhere to the added fiber. During heat drying of the formed paper the starch is gelatinized to effect enhanced bonding of the added fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.