Patent US2254339A successfully refreshed from Google Patents.
US4120747A
Expired / Lapsed
US
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Use of ozone treated chemithermomechanical pulp in a high bulk tissue papermaking process
Assignee: Procter and Gamble Co
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Filing: 1977-07-18
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Granted: 1978-10-17
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Expires: 1997-07-18
Abstract
Abstract Soft, absorbent, bulky paper web useful in tissue, towel, sanitary, and like products. The web is formed by supplying an aqueous furnish which includes thermomechanically defibrated pulp in admixture with chemically defibrated pulp to a foraminous surface such as a Fourdrinier wire, transferring the moist web to an imprinting fabric, thermally drying the web without mechanical compression to a consistency of from about 30 percent to about 98 percent, imprinting the pattern of the fabric into the thermally predried web, and finally drying the web. The resulting web has relatively high tensile strength at relatively low density. Also, the strength properties of the web are significantly improved if the thermomechanically defibrated pulp is made from wood chips which have been soaked in chemical solutions prior to defibrating and then treated with ozone after defibrating.
Inventors
- 👤 Henry David Sarge, III
- 👤 David Charles Kleinschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:27
CPC Classifications
D; D21; D21H; D21H11/00; D21H11/10; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; D21F; D21F11/00; D21F11/006; B; B27; B27N; B27N1/00; B27N3/00; B27N3/08; B27N3/10; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/375; D21H21/00; D21H21/14; D21H21/18; D21H21/20; D21H25/00; D21H25/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
A process for making soft, bulky, absorbent paper webs which comprises the steps of: a. supplying an aqueous papermaking furnish comprising from about 5% to about 70% by weight of total fiber chemi-thermomechanical pulp having a modified Canadian standard freeness from about 500 to about 750 cc and consisting essentially of intact and lignin coated fibers, wherein said chemi-thermomechanical pulp has been prepared by treating wood chips with a liquor containing chemicals selected from the group consisting of sodium sulfite, sodium bisulfite, sodium carbonate, and mixtures thereof prior to defibration, and wherein said chemi-thermomechanical pulp has been treated with ozone subsequent to defibration; b. forming an uncompacted paper web from said papermaking furnish; c. supporting said uncompacted paper web on a conveying and imprinting fabric; d. thermally predrying said uncompacted paper web to a fiber consistency of from about 30% to about 98%; e. imprinting the knuckle pattern of said conveying and imprinting fabric into the thermally predried uncompacted paper web; and f. finally drying the web so formed.
Claim 2
Dependent Claim
169 words
A process for making soft, bulky, absorbent paper webs which comprises the steps of: a. supplying an aqueous papermaking furnish comprising from about 5% to about 70% by weight of total fiber chemi-thermomechanical pulp having a modified Canadian standard freeness from about 500 to about 750 cc and consisting essentially of intact and lignin coated fibers, wherein said chemi-thermomechanical pulp has been prepared by treating wood chips with a liquor containing chemicals selected from the group consisting of sodium sulfite, sodium bisulfite, sodium carbonate, and mixtures thereof prior to defibration, and wherein said chemi-thermomechanical pulp has been treated with ozone subsequent to defibration; b. forming an uncompacted paper web from said papermaking furnish; c. supporting said uncompacted paper web on a conveying and imprinting fabric; d. thermally predrying said uncompacted paper web to a fiber consistency of from about 30% to about 98%; e. imprinting the knuckle pattern of said conveying and imprinting fabric into the thermally predried uncompacted paper web; and f. finally drying the web so formed.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said chemi-thermomechanical pulp which has been ozone treated has been subsequently bleached.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein said furnish comprises from about 25% to about 50% by weight of total fiber chemi-thermomechanical pulp which has been ozone treated.
Claim 5
Dependent Claim
18 words
The process of claim 3 wherein said chemi-thermomechanical pulp which has been ozone treated has been subsequently bleached.
Claim 6
Dependent Claim
14 words
The soft, bulky, absorbent paper web was made by the process of claim 1.
Claim 7
Dependent Claim
13 words
The soft, bulky, absorbent paper web made by the process of claim 2.
Claim 8
Dependent Claim
13 words
The soft, bulky, absorbent paper web made by the process of claim 3.
Claim 9
Dependent Claim
13 words
The soft, bulky, absorbent paper web made by the process of claim 4.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |