Patent · US Expired

Refining element

US6042036A · kind A · utility

9Cited by

5References

6Claims

0Family size

Assignee

Sunds Defibrator Industries AB · SE

Inventors

Nils Virving · Shelbyville, US
Peter Austin Bergquist · Westby, US
Anders Hawen · Tyresö, SE

Key dates

Filing date	Jun 17, 1998
Grant date	Mar 28, 2000
Priority date	—
Expiry date	Jun 17, 2018

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21D1/22
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Refining elements are disclosed for use in refiners in which the refining elements comprise a refining surface with a plurality of raised bars alternating with a plurality of grooves. The raised bars at the inlet of the refining path have a first spacing and form a first angle with respect to a radius or generatrix defining the refining path and the plurality of raised bars at the outlet of the refining path have a second spacing and form a second angle with respect to the radius or generatrix, the first angle being between about 50.degree. and 85.degree. and the second angle being between about -25.degree. and +25.degree., and the first spacing being greater than the second spacing.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.