Pulpstone for long fiber pulp production
US8167962B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 9, 2008 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Jun 15, 2029 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21B1/063
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Pulp production techniques are disclosed. In one embodiment, pulpstone segments are provided, that include proppant grits in the place of some or all of the conventional abrasive typically used in pulpstone applications. The proppant or proppant-abrasive mixture can be combined into a three-dimensional matrix supported by a vitrified bond. Alternative embodiments use proppant grits in an organic bond or a metal bond or a cement bond (each of which may also include abrasive grits in addition to proppant grits). The proportion of proppant grits to abrasive grits can be varied to produce pulp of varying fiber length distribution as required by the end-user (e.g., paper mill). The greater the proppant concentration, the less cutting of the fibers by the conventional abrasive will occur, producing a greater percentage content of longer fibers. Such pulp produces higher quality paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.