Global Patent Index - EP 1086270 A1

EP 1086270 A1 2001-03-28 - SCREEN CYLINDER STRESS CONCENTRATION RELIEF

Title (en)

SCREEN CYLINDER STRESS CONCENTRATION RELIEF

Title (de)

SIEBZYLINDER MIT SPANNUNGSKONZENTRATIONSVERMINDERUNG

Title (fr)

RELAXATION DE LA CONCENTRATION DES CONTRAINTES DANS UN CYLINDRE TAMISEUR

Publication

EP 1086270 A1 (EN)

Application

EP 99924621 A

Priority

  • CA 9900533 W
  • US 8836998 P

Abstract (en)

[origin: WO9964664A1] A screen cylinder, and a method of making the screen cylinder, take into account the stress concentrations that are formed, particularly at the inner and outer surfaces of the finished screen cylinder, so as to minimize them. The stress relief minimization is accomplished by providing a plurality of stress relief grooves (25) in land areas (121) between accept flow providing grooves (113) that are in substantially end-to-end alignement, the stress relief grooves each having a depth between about 10-80 % (e.g. between about 40-60 %) of the thickness dimension (119) of the plate (110), so as to reduce by at least 10 % (e.g. about 30-50 %) the magnitude of deformation of the screen slots (115) due to compression or tension in the surfaces of the screen cylinder as a result of cylinder formation from the plate, compared to if the relief grooves were not present.

IPC 1-7 (main, further and additional classification)

D21D 5/16

IPC 8 full level (invention and additional information)

B01D 29/11 (2006.01); B01D 39/00 (2006.01); D21D 5/16 (2006.01)

CPC (invention and additional information)

D21D 5/16 (2013.01)

Citation (search report)

See references of WO 9964664A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9964664 A1 19991216; AU 4127099 A 19991230; CA 2334572 A1 19991216; EP 1086270 A1 20010328; JP 2002517314 A 20020618

INPADOC legal status


2002-09-18 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20020322

2001-11-28 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20011011

2001-03-28 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001214

2001-03-28 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE