Method of improving properties of mechanical paper pulp without chemical reaction therewith
US4229250A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1979 |
| Grant date | Oct 21, 1980 |
| Priority date | — |
| Expiry date | Feb 28, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/004
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Properties of mechanical paper pulp which is produced by grinding or otherwise frictionally acting on natural fibrous raw material containing plasticizable constituents which become heated to a temperature sufficiently high to soften the plasticizable constituents thereof are improved by the addition of paper filler material which is chemically inert to the pulp at a time which results in the filler being in contact therewith while the plasticizable constituents are plasticized and thus softened and sticky. This causes the filler, without chemical reaction, to adhere to the plasticized constituents and thus to the fibers of the pulp to result in improved properties of a totally mechanical pulp. The properties which are improved include the optical and printing properties of the paper made from the pulp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.