Refiner segment

• US 5,439,183 A
• Filed: 12/28/1994
• Issued: 08/08/1995
• Est. Priority Date: 06/17/1993
• Status: Expired due to Term

• Current Assignee: Sunds Defibrator Industries Ab
• Original Assignee: Sunds Defibrator Industries Ab
• Inventors: Virving, Nils G.
• Primary Examiner(s): Watts, Douglas D.
• Application Number:
  US08/365,065
• Time in Patent Office: 223 Days
• Field of Search: 241/253, 241/261.2, 241/261.3, 241/296
• US Class Current: 241/296
• CPC Class Codes: B02C 7/12 Shape or construction of discs
• CPC Class Codes: D21D 1/306 Discs

Abstract

Refiner segments for use in disk refiners for the disintegration of lignocellulose-containing material are disclosed, in which the refiner segment is formed with a pattern of bars and grooves and includes dams placed in the grooves. The dams are arranged so that their angle in relation to the radius of the refiner segment is less than about 30°, preferably less than about 15°.

Claims

1. A refiner segment for use in disk refiners for the treatment of lignocellulose-containing materials, said refiner segment having a radius and including an upper surface, an alternating pattern of pluralities of bars extending upwardly from said upper surface of said refiner segment to a predetermined bar height, and intermediate grooves having a predetermined groove width therebetween, and a plurality of dam members disposed in said intermediate grooves and extending upwardly from said upper surface of said refiner segment to said predetermined bar height, each of said dam members being arranged at a predetermined angle of less than about 30°

with respect to said radius of said refiner segment, said dam members extending across said entire predetermined groove width of said intermediate grooves at said predetermined bar height.

2. The refiner segment of claim 1 wherein said dam members extend upwardly from said refiner surface at a predetermined angle of less than about 15°

.

3. The refiner segment of claim 1 wherein said plurality of dam members comprises a first plurality of dam members, and including a second plurality of dam members located in each of said intermediate grooves radially inwardly with respect to said first plurality of dam members.

4. The refiner segment of claim 1 wherein said pluralities of bars extend obliquely with respect to said radius of said refiner segment.