Invention Grant
- Patent Title: Process for making absorbent towel and soft sanitary tissue paper webs having nanofilaments
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Application No.: US16587163Application Date: 2019-09-30
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Publication No.: US11111344B2Publication Date: 2021-09-07
- Inventor: Tobias Ziegenbein
- Applicant: Mercer International Inc.
- Applicant Address: CA Vancouver
- Assignee: Mercer International Inc.
- Current Assignee: Mercer International Inc.
- Current Assignee Address: CA Vancouver
- Agency: Stephen T. Murphy Law LLC
- Agent Peter D. Meyer; Stephen T. Murphy
- Main IPC: D21H27/34
- IPC: D21H27/34 ; D21H27/30 ; D21H21/18 ; D21H15/06 ; D21H11/18 ; D21H11/00 ; D21H11/04 ; D21H11/20 ; D21H13/02 ; D21H17/25 ; D21H21/20 ; D21H27/00 ; C08J5/18 ; C08L1/06

Abstract:
Processes for making absorbent towel paper and soft sanitary tissue paper webs are provided. The processes provide the steps of: (a) providing a papermaking furnish, (b) forming a wet fibrous web having a differential density from the paper making furnish; and, (c) drying the differential density wet fibrous web to not more than about 10% by weight moisture. Step a) provides: i) from about 20.1% to about 99.9% by weight of a softwood pulp fiber mixture; and, ii) from greater than 0% to about 79.9% by weight of a hardwood pulp fiber mixture. Step i) provides u) from about 20.0% to about 99.8% by weight of softwood pulp fiber; and, v) from about 0.05% to about 5.0% by weight of strengthening additive. Step ii) provides w) from about 0.05% to about 79.4% by weight of hardwood pulp fibers; and, x) from about 0.05% to about 20.0% by weight of cellulose nano-filaments.
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