公开(公告)号：EP1309385A1

公开(公告)日：2003-05-14

申请号：EP01930548.1

申请日：2001-04-18

申请人： J & L Fiber Services, Inc.

发明人： LUTZ, Mark, S. ,  CROMELL, Tim, J.

IPC分类号： B01D29/11 ,  B01D35/30

CPC分类号： D21D5/16 ,  B01D29/111 ,  B01D29/445 ,  B01D33/067 ,  B07B1/18 ,  B07B1/4618

摘要： A pulp screening assembly where each support ring is weldlessly bonded to a perforate screen section by a bonding material that preferably is a brazing material. There is a joint between each ring and a screen section in which brazing material is disposed. The joint includes at least one set of mating faying surfaces that are offset relative to a longitudinal axis of the screening assembly. In a preferred embodiment, there is a tolerance between mated faying surfaces of no greater than 0.008 inches to ensure a good weldless bond is achieved. In another preferred embodiment, the tolerance is no greater than 0.004 inches. A weldless screen basket is produced having end rings, a plurality of slotted screen sections, and an intermediate ring having slots with back grooves within four millimeters of a ring at each end increasing screening open area.