Feeding element for fibrous material

• US 6,227,471 B1
• Filed: 07/19/1999
• Issued: 05/08/2001
• Est. Priority Date: 02/25/1997
• Status: Expired due to Fees

• Current Assignee: Valmet Fibertech AB (Valmet Oyj)
• Original Assignee: Valmet Fibertech AB (Valmet Oyj)
• Inventors: Virving, Nils
• Primary Examiner(s): BUTLER, RODNEY ALLEN
• Application Number:
  US09/341,862
• Time in Patent Office: 659 Days
• Field of Search: 241/246, 241/247, 241/261.2, 241/261.3, 241/244
• US Class Current: 241/244
• CPC Class Codes: B02C 7/11 Details
• CPC Class Codes: D21B 1/26 Driving or feeding arrangements
• CPC Class Codes: D21D 1/30 Disc mills

Abstract

A feeding element is disclosed for use in connection with a refiner for lignocellulosic fibrous material including a stationary refiner, a rotary refiner mounted for rotation in juxtaposition with the stationary refiner thereby forming a refining gap therebetween, a feeder for feeding the lignocellulosic fibrous material centrally to a feed zone within the refining gap and a refining zone extending radially outward from the feed zone, the feeding element including a feeder with an upper surface for mounting on the rotary refiner at a location displaced outwardly from and directly adjacent to the central location of the feed zone, the feeder including at least one radial feed bar projecting from the upper surface of the feeder, the at least one radial feed bar including a body and a projecting portion extending laterally from the body at a location displaced from the upper surface of the feeder.

Claims

1. A feeding element for use in connection with a refiner for lignocellulosic fibrous material including a stationary refining member, a rotary refining member mounted for rotation in juxtaposition with said stationary refining member thereby forming a refining gap therebetween, a feeder for feeding said lignocellulosic fibrous material centrally to a feed zone within said refining gap and a refining zone extending radially outward from said feed zone, said feeding element comprising a feeding member having an upper surface for mounting on said rotary refining member at a location outwardly displaced from and directly adjacent to said central location of said feed zone, said feeding member including at least one radial feed bar projecting from said upper surface of said feeding member, said at least one radial feed bar including a body portion and a projecting portion extending laterally from said body portion at a location displaced from said upper surface of said feeding member.

2. The feeding element of claim 1 wherein said body portion includes a first side and a second side, and said projecting portion extends laterally from both said first and second sides of said body portion.

3. The feeding element of claim 1 including a plurality of said radial feed bars, and wherein said projecting portions extending laterally from each of said plurality of radial feed bars are spaced from adjacent ones of said projecting portions.

4. The feeding element of claim 1 including a plurality of said radial feed bars, and wherein said projecting portions extending laterally from each of said plurality of radial feed bars are connected to adjacent ones of said projecting portions to form bridges between said plurality of radial feed bars, thereby creating closed channels beneath said bridges.

5. The feeding element of claim 1 including a plurality of said radial feed bars extending substantially over said entire upper surface of said feeding member.

6. The feeding element of claim 1 wherein the outer portion of said feeding element extending radially from said feeding member includes a plurality of radially projecting bars for working said lignocellulosic fibrous material.

7. The feeding element of claim 1 wherein said feeding element comprises an annular feeding element extending entirely around said rotary refining member.