William Elmer Herring

US Patent:

20040200587, Oct 14, 2004

Filed:

Apr 8, 2003

Appl. No.:

10/409765

Inventors:

William Herring - Kent WA, US
David Jack - Federal Way WA, US
Grant Bourree - Grande Prairie, CA

International Classification:

D21C003/20
D21C009/14
D21C009/147

US Classification:

162/072000, 162/082000, 162/065000, 162/088000, 162/089000

Abstract:

Bleached, Kraft chemical pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In one embodiment, the pulp has a hemicellulose content greater than about 17 weight percent as measured by the 18% caustic solubility test. In another aspect, a method for making wood cellulose pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In the method, a lignocellulosic material is pulped in caustic sulfide to provide a first brownstock, which is treated with oxygen to provide a second brownstock, which is then bleached to provide the pulp product.

US Patent:

20040200589, Oct 14, 2004

Filed:

Apr 8, 2003

Appl. No.:

10/409762

Inventors:

William Herring - Kent WA, US
David Jack - Federal Way WA, US
Grant Bourree - Grande Prairie, CA

International Classification:

D21C003/20
D21C009/14
D21C009/147

US Classification:

162/082000, 162/072000, 162/065000, 162/088000, 162/089000

Abstract:

Bleached, Kraft chemical pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In one embodiment, the pulp has a hemicellulose content greater than about 17 weight percent as measured by the 18% caustic solubility test. In another aspect, a method for making wood cellulose pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In the method, a lignocellulosic material is pulped in caustic sulfide to provide a first brownstock, which is treated with oxygen to provide a second brownstock, which is then bleached to provide the pulp product.