Global Patent Index - EP 0891442 A4

EP 0891442 A4 2000-03-01 - PAPER PULP DRAINAGE AID

Title (en)

PAPER PULP DRAINAGE AID

Title (de)

PAPIERZELLSTOFFDRAINAGEHILFSMITTEL

Title (fr)

AGENT D'EGOUTTAGE POUR PATE A PAPIER

Publication

EP 0891442 A4 (EN)

Application

EP 97913976 A

Priority

  • AU 9700182 W
  • AU PN909696 A

Abstract (en)

[origin: WO9738164A1] To improve the drainage and consequently the machine speed in making paper or paperboard from recycled paper, a starch hydrolysing enzyme [alpha-amylase] is added prior to the forming section. The enzyme must be active in the temperature range of 40 to 90 DEG C and in the pH range of 6 to 9. Amounts as low as 0.05 % by weight of the oven dried paper forming the pulp can allow increases in machine speeds of about 5 % or more.

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

D21H 17/22; D21H 21/10

IPC 8 full level (invention and additional information)

D21H 21/10 (2006.01); D21H 11/14 (2006.01); D21H 17/00 (2006.01); D21H 17/22 (2006.01)

CPC (invention and additional information)

D21H 21/10 (2013.01); D21H 11/14 (2013.01); D21H 17/005 (2013.01); D21H 17/22 (2013.01)

Citation (search report)

Designated contracting state (EPC)

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

EPO simple patent family

WO 9738164 A1 19971016; AU PN909696 D0 19960426; CA 2251191 A1 19971016; EP 0891442 A1 19990120; EP 0891442 A4 20000301; NZ 331961 A 19990329

INPADOC legal status


2002-12-18 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20020611

2001-03-28 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010207

2000-03-01 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20000117

2000-03-01 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

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

1999-01-20 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19981013

1999-01-20 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

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