US4377543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strength and softness control of dry formed sheets
Assignee: Kimberly Clark Worldwide Inc
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Filing: 1981-10-13
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Granted: 1983-03-22
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Expires: 2001-10-13
Abstract
Abstract A method of forming an air-laid web or sheet of wood pulp fibers suitable for tissue and toweling applications comprising airlaying a web of wood pulp fibers, applying water containing a chemical softening agent to the web, pressure bonding the water-treated web to provide dry stength, preferably drying the pressure-bonded web, applying an adhesive containing solution to the dried web to provide increased wet strength, and drying the web to form the finished product. By adding a chemical softening agent to the water applied to the air-laid web ahead of the pressure bonding rolls, the strength and softness of the finished web can be controlled. Alternatively, the chemical softening agent can be added to the printing adhesive solution.
Inventors
- 👤 Irene B. Strohbeen
- 👤 James H. Dinius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:09
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/26; D21H5/265; D21H25/00; D21H25/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
In a process for forming an air laid web of wood pulp fibers comprising the steps of: (a) airlaying wood pulp fibers onto a moving foraminous carrier to form a substantially dry and uncompacted web of randomly deposited fibers, (b) applying water to the web of step (a), (c) pressure bonding the water treated web of step (b) to provide dry strength, (d) drying the pressure bonded web of step (c), (e) applying adhesive to the dried web of step (d) to provide increased wet strength and coincidentally dry strength, and (f) drying the web of step (e) to form a web with both wet and dry strength, the improvement comprising: controlling the softness and strength of the web of step (f) by adding a chemical softening agent to the water applied to the web in step (b) above.
Claim 2
Dependent Claim
139 words
In a process for forming an air laid web of wood pulp fibers comprising the steps of: (a) airlaying wood pulp fibers onto a moving foraminous carrier to form a substantially dry and uncompacted web of randomly deposited fibers, (b) applying water to the web of step (a), (c) pressure bonding the water treated web of step (b) to provide dry strength, (d) drying the pressure bonded web of step (c), (e) applying adhesive to the dried web of step (d) to provide increased wet strength and coincidentally dry strength, and (f) drying the web of step (e) to form a web with both wet and dry strength, the improvement comprising: controlling the softness and strength of the web of step (f) by adding a chemical softening agent to the water applied to the web in step (b) above.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein said chemical softening agent is dimethyl di-tallow quaternary ammonium chloride.
Claim 4
Dependent Claim
28 words
The process of claim 1, wherein said chemical softening agent is applied as an aqueous solution having a concentration of from about 0.01 to about 3.0 weight %.
Claim 5
Dependent Claim
32 words
The process of claim 1, wherein said chemical softening agent is applied in an amount of from about 0.003 to about 1.0 weight percent based on the dry weight of the web.
Claim 6
Dependent Claim
148 words
In a process for forming an air laid web of wood pulp fibers comprising the steps of: (a) airlaying wood pulp fibers onto a moving foraminous carrier to form a substantially dry and uncompacted web of randomly deposited fibers, (b) applying water to the web of step (a), (c) pressure bonding the water treated web of step (b) to provide dry strength, (d) drying the pressure bonded web of step (c), (e) applying an aqueous solution of an adhesive to the dried web of step (d) to provide increased wet strength and coincidentally dry strength, and (f) drying the web of step (e) to form a web with both wet and dry strength, the improvement comprising: controlling the softness and strength of the web of step (f) by adding a chemical softening agent to said aqueous solution of an adhesive applied to the web in step (e) above.
Claim 7
Dependent Claim
148 words
In a process for forming an air laid web of wood pulp fibers comprising the steps of: (a) airlaying wood pulp fibers onto a moving foraminous carrier to form a substantially dry and uncompacted web of randomly deposited fibers, (b) applying water to the web of step (a), (c) pressure bonding the water treated web of step (b) to provide dry strength, (d) drying the pressure bonded web of step (c), (e) applying an aqueous solution of an adhesive to the dried web of step (d) to provide increased wet strength and coincidentally dry strength, and (f) drying the web of step (e) to form a web with both wet and dry strength, the improvement comprising: controlling the softness and strength of the web of step (f) by adding a chemical softening agent to said aqueous solution of an adhesive applied to the web in step (e) above.
Claim 8
Dependent Claim
16 words
The process of claim 5, wherein said chemical softening agent is dimethyl di-tallow quaternary ammonium chloride.
Claim 9
Dependent Claim
28 words
The process of claim 5, wherein said chemical softening agent is applied as an aqueous solution having a concentration of from about 0.01 to about 3.0 weight %.
Claim 10
Dependent Claim
32 words
The process of claim 5, wherein said chemical softening agent is applied in an amount of from about 0.005 to about 1.5 weight % based on the dry weight of the web.
Claim 11
Dependent Claim
129 words
In a process for forming an air laid web of wood pulp fibers comprising the steps of: (a) airlaying wood pulp fibers onto a moving foraminous carrier to form a substantially dry and uncompacted web of randomly deposited fibers, (b) applying water to the web of step (a), (c) pressure bonding the water treated web of step (b) to provide dry strength, (d) applying adhesive to the web of step (c) to provide increased wet strength and coincidentally dry strength, and (e) drying the web of step (d) to form a web with both wet and dry strength, the improvement comprising: controlling the softness and strength of the web of step (e) by adding a chemical softening agent to the water applied to the web in step (b) above.
Claim 12
Dependent Claim
129 words
In a process for forming an air laid web of wood pulp fibers comprising the steps of: (a) airlaying wood pulp fibers onto a moving foraminous carrier to form a substantially dry and uncompacted web of randomly deposited fibers, (b) applying water to the web of step (a), (c) pressure bonding the water treated web of step (b) to provide dry strength, (d) applying adhesive to the web of step (c) to provide increased wet strength and coincidentally dry strength, and (e) drying the web of step (d) to form a web with both wet and dry strength, the improvement comprising: controlling the softness and strength of the web of step (e) by adding a chemical softening agent to the water applied to the web in step (b) above.
Claim 13
Dependent Claim
134 words
In a process for forming an air laid web of wood pulp fibers comprising the steps of: (a) airlaying wood pulp fibers onto a moving foraminous carrier to form a substantially dry and uncompacted web of randomly deposited fibers, (b) applying water to the web of step (a), (c) pressure bonding the water treated web of step (b) to provide dry strength, (d) applying an aqueous solution of an adhesive to the web of step (c) to provide increased wet strength, and (e) drying the web of step (d) to form a web with both wet and dry strength, the improvement comprising: controlling the softness and strength of the web of step (e) by adding a chemical softening agent to said aqueous solution of an adhesive applied to the web in step (d) above.
Claim 14
Dependent Claim
134 words
In a process for forming an air laid web of wood pulp fibers comprising the steps of: (a) airlaying wood pulp fibers onto a moving foraminous carrier to form a substantially dry and uncompacted web of randomly deposited fibers, (b) applying water to the web of step (a), (c) pressure bonding the water treated web of step (b) to provide dry strength, (d) applying an aqueous solution of an adhesive to the web of step (c) to provide increased wet strength, and (e) drying the web of step (d) to form a web with both wet and dry strength, the improvement comprising: controlling the softness and strength of the web of step (e) by adding a chemical softening agent to said aqueous solution of an adhesive applied to the web in step (d) above.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |