US3926716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer and adherence of relatively dry paper web to a rotating cylindrical surface
Assignee: Procter and Gamble Co
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Filing: 1974-03-19
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Granted: 1975-12-16
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Expires: 1994-03-19
Abstract
Abstract In manufacturing a soft and absorbent tissue paper, a moist web deposited from a fiber-water slurry, is contoured with the pattern from an open mesh conveying fabric and thermally dried to a relatively high fiber consistency. Following these steps, the resulting relatively dry patterned web is imprinted as it is transferred and adhered to a rotating cylindrical surface in the form of a Yankee dryer utilizing an aqueous polyvinyl alcohol solution where the polyvinyl alcohol is characterized by a particular degree of hydrolysis and particular viscosity characteristics. By thermally drying to a high fiber consistency prior to the transfer step, the amount of drying load required to be carried by the Yankee dryer is reduced resulting in either (1) increased line speed as a result of reduced Yankee drying load, which reduces the required residence time of the web on the dryer or (2) a reduction in the required diameter of the Yankee dryer, a significant reduction in capital equipment cost. By thermally drying the web to a relatively high consistency on the conveying fabric, a deeper more pronounced pattern in the Z direction is obtained due to an increase in web structure strength and resistance to compaction of the pattern. This results in increased bulk (lower density) and increased softness. As a result of utilizing the particular polyvinyl alcohol, transfer and adherence of the relatively dry web to the Yankee dryer is obtained so as to minimize the amount of skipped crepe whereby the problem of web breakage downstream of creping is eliminated.
Inventors
- 👤 Gregory A Bates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:42
CPC Classifications
D; D21; D21F; D21F11/00; D21F11/14; D21F11/006; D21H; D21H21/00; D21H21/14; D21H21/146; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/36
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
130 words
A PROCESS FOR MANUFACTRUING A SOFT AND ABSORBENT TISSUE PAPER WEB HAVING A UNIFORM BASIS WEIGHT OF ABOUT 5 TO ABOUT 40 POUNDS PER 3000 SQUARE FEET, SAID PROCESS COMPRISING THE STEPS OF A. DRYING WITHOUT COMPACTING A MOIST PAPER WEB TO PROVIDE A FIBER CONSISTENCY EXCEEDING ABOUT 68% AND RANGING UP TO ABOUT 98% WHILE SAID WEB IS ON A PATTERNED IMPRINTING FABRIC; B. IMPRINTING THE RESULTING RELATIVELY DRY WEB WITH THE PATTERN OF THE IMPRINTING FABRIC; C. APPLYING AN AQUEOUS POLYVINYL ALCOHOL SOLUTION TO CAUSE TRANSFER AND ADHERENCE OF THE IMPRINTED WEB TO A ROTATING CYLINDRICAL SURFACE, SAID POLYVINYL ALCLHOL BEING CHARACTERIZED BY A DEGREE OF LHYROLYSIS RANGING FROM ABOUT 80% TO ABOUT 90% AND A VISCOSITY AS A 4% AQUEOUS SOLUTION AT 20*C. EXCEEDING ABOUT 20 CENTIPOISES.
Claim 2
Dependent Claim
130 words
A PROCESS FOR MANUFACTRUING A SOFT AND ABSORBENT TISSUE PAPER WEB HAVING A UNIFORM BASIS WEIGHT OF ABOUT 5 TO ABOUT 40 POUNDS PER 3000 SQUARE FEET, SAID PROCESS COMPRISING THE STEPS OF A. DRYING WITHOUT COMPACTING A MOIST PAPER WEB TO PROVIDE A FIBER CONSISTENCY EXCEEDING ABOUT 68% AND RANGING UP TO ABOUT 98% WHILE SAID WEB IS ON A PATTERNED IMPRINTING FABRIC; B. IMPRINTING THE RESULTING RELATIVELY DRY WEB WITH THE PATTERN OF THE IMPRINTING FABRIC; C. APPLYING AN AQUEOUS POLYVINYL ALCOHOL SOLUTION TO CAUSE TRANSFER AND ADHERENCE OF THE IMPRINTED WEB TO A ROTATING CYLINDRICAL SURFACE, SAID POLYVINYL ALCLHOL BEING CHARACTERIZED BY A DEGREE OF LHYROLYSIS RANGING FROM ABOUT 80% TO ABOUT 90% AND A VISCOSITY AS A 4% AQUEOUS SOLUTION AT 20*C. EXCEEDING ABOUT 20 CENTIPOISES.
Claim 3
Dependent Claim
28 words
A process as recited in claim 1, in which said polyvinyl alcohol is characterized by a viscosity as a 4% aqueous solution at 20*C. above about 35 centipoises.
Claim 4
Dependent Claim
26 words
A process as recited in claim 2, in which said polyvinyl alcohol is characterized by a degree of hydrolysis ranging from about 86% to about 90%.
Claim 5
Dependent Claim
18 words
A process as recited in claim 3, in which the rotating cylindrical surface is a Yankee dryer surface.
Claim 6
Dependent Claim
18 words
A process as recited in claim 1, in which the rotating cylindrical surface is a Yankee dryer surface.
Claim 7
Dependent Claim
28 words
A process as recited in claim 5, in which said polyvinyl alcohol is characterized by a viscosity as a 4% aqueous solution at 20*C. above about 35 centipoises.
Claim 8
Dependent Claim
43 words
A process as recited in claim 1, in which said polyvinyl alcohol solution is applied to provide an amount of polyvinyl alcohol on a dry basis ranging from about 0.05 pounds to about 2 pounds per ton of paper on a dry basis.
Claim 9
Dependent Claim
43 words
A process as recited in claim 7, in which said polyvinyl alcohol solution is applied to provide an amount of polyvinyl alcohol on a dry basis ranging from about 0.3 pounds to about 1 pound per ton of paper on a dry basis.
Claim 10
Dependent Claim
147 words
A process for manufacturing a soft and absorbent tissue paper web having a uniform basis weight of about 5 to about 40 pounds per 3000 square feet, said process comprising the steps of a. causing a moist paper web to conform to the pattern of a patterned imprinting fabric utilizing vacuum and then drying the moist web on the fabric without compacting to provide a fiber consistency exceeding about 68% and ranging up to about 98%; b. imprinting the resulting relatively dry web with the pattern of the imprinting fabric by use of roll pressure; c. applying an aqueous polyvinyl alcohol solution to cause transfer and adherence of the imprinted web to a rotating cylindrical surface, said polyvinyl alcohol being characterized by a degree of hydrolysis ranging from about 80% to about 90% and a viscosity as a 4% aqueous solution at 20*C. exceeding about 20 centipoises.
Claim 11
Dependent Claim
147 words
A process for manufacturing a soft and absorbent tissue paper web having a uniform basis weight of about 5 to about 40 pounds per 3000 square feet, said process comprising the steps of a. causing a moist paper web to conform to the pattern of a patterned imprinting fabric utilizing vacuum and then drying the moist web on the fabric without compacting to provide a fiber consistency exceeding about 68% and ranging up to about 98%; b. imprinting the resulting relatively dry web with the pattern of the imprinting fabric by use of roll pressure; c. applying an aqueous polyvinyl alcohol solution to cause transfer and adherence of the imprinted web to a rotating cylindrical surface, said polyvinyl alcohol being characterized by a degree of hydrolysis ranging from about 80% to about 90% and a viscosity as a 4% aqueous solution at 20*C. exceeding about 20 centipoises.
Claim 12
Dependent Claim
141 words
A process for manufacturing a soft and absorbent tissue paper web having a uniform basis weight of about 5 to about 40 pounds per 3000 square feet, said process comprising the steps of a. drying a moist paper web to provide a fiber consistency exceeding about 68% and ranging up to about 98% while said web is on a patterned imprinting fabric without utilizing roll pressure to compact the web; b. imprinting the resulting relatively dry web with the pattern of the imprinting fabric by use of roll pressure; c. applying an aqueous polyvinyl alcohol solution to cause transfer and adherence of the imprinted web to a rotating cylindrical surface, said polyvinyl alcohol being characterized by a degree of hydrolysis ranging from about 80% to about 90% and a viscosity as a 4% aqueous solution at 20*C. exceeding about 20 centipoises.
Claim 13
Dependent Claim
141 words
A process for manufacturing a soft and absorbent tissue paper web having a uniform basis weight of about 5 to about 40 pounds per 3000 square feet, said process comprising the steps of a. drying a moist paper web to provide a fiber consistency exceeding about 68% and ranging up to about 98% while said web is on a patterned imprinting fabric without utilizing roll pressure to compact the web; b. imprinting the resulting relatively dry web with the pattern of the imprinting fabric by use of roll pressure; c. applying an aqueous polyvinyl alcohol solution to cause transfer and adherence of the imprinted web to a rotating cylindrical surface, said polyvinyl alcohol being characterized by a degree of hydrolysis ranging from about 80% to about 90% and a viscosity as a 4% aqueous solution at 20*C. exceeding about 20 centipoises.
Claim 14
Dependent Claim
135 words
A process for manufacturing a soft and absorbent tissue paper web having a uniform basis weight of about 5 to about 40 pounds per 3000 square feet, said process comprising the steps of a. drying a moist paper web to provide a fiber consistency exceeding about 68% and ranging up to about 98% while said web is on a patterned imprinting fabric by directing hot air at the web; b. imprinting the resulting relatively dry web with the pattern of the imprinting fabric; c. applying an aqueous polyvinyl alcohol solution to cause transfer and adherence of the imprinted web to a rotating cylindrical surface, said polyvinyl alcohol being characterized by a degree of hydrolysis ranging from about 80% to about 90% and a viscosity as a 4% aqueous solution at 20*C. exceeding about 20 centipoises.
Claim 15
Dependent Claim
135 words
A process for manufacturing a soft and absorbent tissue paper web having a uniform basis weight of about 5 to about 40 pounds per 3000 square feet, said process comprising the steps of a. drying a moist paper web to provide a fiber consistency exceeding about 68% and ranging up to about 98% while said web is on a patterned imprinting fabric by directing hot air at the web; b. imprinting the resulting relatively dry web with the pattern of the imprinting fabric; c. applying an aqueous polyvinyl alcohol solution to cause transfer and adherence of the imprinted web to a rotating cylindrical surface, said polyvinyl alcohol being characterized by a degree of hydrolysis ranging from about 80% to about 90% and a viscosity as a 4% aqueous solution at 20*C. exceeding about 20 centipoises.
Claim 16
Dependent Claim
28 words
A process as recited in claim 9, in which said polyvinyl alcohol is characterized by a viscosity as a 4% aqueous solution at 20*C. above about 35 centipoises.
Claim 17
Dependent Claim
26 words
A process as recited in claim 12, in which said polyvinyl alcohol is characterized by a degree of hydrolysis ranging from about 86% to about 90%.
Claim 18
Dependent Claim
18 words
A process as recited in claim 13, in which the rotating cylindrical surface is a Yankee dryer surface.
Claim 19
Dependent Claim
18 words
A process as recited in claim 9, in which the rotating cylindrical surface is a Yankee dryer surface.
Claim 20
Dependent Claim
28 words
A process as recited in claim 15, in which said polyvinyl alcohol is characterized by a viscosity as a 4% aqueous solution at 20*C. above about 35 centipoises.
Claim 21
Dependent Claim
43 words
A process as recited in claim 16, in which said polyvinyl alcohol solution is applied to provide an amount of polyvinyl alcohol on a dry basis ranging from about 0.05 pounds to about 2 pounds per ton of paper on a dry basis.
Claim 22
Dependent Claim
43 words
A process as recited in claim 17, in which said polyvinyl alcohol solution is applied to provide an amount of polyvinyl alcohol on a dry basis ranging from about 0.3 pounds to about 1 pound per ton of paper on a dry basis.
Claim 23
Dependent Claim
28 words
A process as recited in claim 10, in which said polyvinyl alcohol is characterized by a viscosity as a 4% aqueous solution at 20*C. above about 35 centipoises.
Claim 24
Dependent Claim
26 words
A process as recited in claim 19, in which said polyvinyl alcohol is characterized by a degree of hydrolysis ranging from about 86% to about 90%.
Claim 25
Dependent Claim
18 words
A process as recited in claim 20, in which the rotating cylindrical surface is a Yankee dryer surface.
Claim 26
Dependent Claim
18 words
A process as recited in claim 10, in which the rotating cylindrical surface is a Yankee dryer surface.
Claim 27
Dependent Claim
28 words
A process as recited in claim 22, in which said polyvinyl alcohol is characterized by a viscosity as a 4% aqueous solution at 20*C. above about 35 centipoises.
Claim 28
Dependent Claim
43 words
A process as recited in claim 23, in which said polyvinyl alcohol solution is applied to provide an amount of polyvinyl alcohol on a dry basis ranging from about 0.05 pounds to about 2 pounds per ton of paper on a dry basis.
Claim 29
Dependent Claim
43 words
A process as recited in claim 24, in which said polyvinyl alcohol solution is applied to provide an amount of polyvinyl alcohol on a dry basis ranging from about 0.3 pounds to about 1 pound per ton of paper on a dry basis.
Claim 30
Dependent Claim
27 words
A process as recited in claim 11, in which said polyvinyl alcohol is characterized by a viscosity as a 4% solution at 20*C. above about 35 centipoises.
Claim 31
Dependent Claim
26 words
A process as recited in claim 26, in which said polyvinyl alcohol is characterized by a degree of hydrolysis ranging from about 86% to about 90%.
Claim 32
Dependent Claim
18 words
A process as recited in claim 27, in which the rotating cylindrical surface is a Yankee dryer surface.
Claim 33
Dependent Claim
18 words
A process as recited in claim 11, in which the rotating cylindrical surface is a Yankee dryer surface.
Claim 34
Dependent Claim
28 words
A process as recited in claim 29, iN which said polyvinyl alcohol is characterized by a viscosity as a 4% aqueous solution at 20*C. above about 35 centipoises.
Claim 35
Dependent Claim
43 words
A process as recited in claim 30, in which said polyvinyl alcohol solution is applied to provide an amount of polyvinyl alcohol on a dry basis ranging from about 0.05 pounds to about 2 pounds per ton of paper on a dry basis.
Claim 36
Dependent Claim
43 words
A process as recited in claim 31, in which said polyvinyl alcohol solution is applied to provide an amount of polyvinyl alcohol on a dry basis ranging from about 0.3 pounds to about 1 pound per ton of paper on a dry basis.
References Cited (Backward Citations)
US3301746A
Cited
US3812000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |