Systems for tissue dried with metal bands
First Claim
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1. An apparatus for making a foreshortened cellulosic web, in combination with a dryer fabric, the apparatus comprising:
- a) a first press belt having a first press surface, and a second press surface, the second press surface being substantially equidistantly spaced apart from the first press surface in a compression zone;
b) a pressing means for pressing the first and second press surfaces towards each other in the compression zone to compress a cellulosic web residing on the dryer fabric, wherein the first press surface contacts the cellulosic web;
c) a means for creating a temperature differential between the first press surface and the second press surface to move water from the cellulosic web into the dryer fabric;
d) a transporting means for moving the cellulosic web in the machine direction at a first velocity;
e) a foreshortening means for foreshortening the cellulosic web after the web has passed through the compression zone;
f) sensor means for determining the cross-directional variability of a property of at least one of the cellulosic web, the first press belt, the first press surface, and the second press surface, wherein the sensor means generates an output signal based on the cross-directional variability of the property; and
, g) control means for decreasing the cross-directional variability of the property responsive to the signal from the sensor means.
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Abstract
A web treatment device is disclosed capable of heating and creping a fibrous web with control systems for uniform operation. The web is pressed between two belts in a compression zone, where is it also subject to a temperature gradient that can assist in water removal. Durable coatings on the press belts can assist in maintaining good performance. The system can be used to apply texture to a fibrous web or drive chemical reactions or other physical changes in the web.
304 Citations
66 Claims
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1. An apparatus for making a foreshortened cellulosic web, in combination with a dryer fabric, the apparatus comprising:
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a) a first press belt having a first press surface, and a second press surface, the second press surface being substantially equidistantly spaced apart from the first press surface in a compression zone;
b) a pressing means for pressing the first and second press surfaces towards each other in the compression zone to compress a cellulosic web residing on the dryer fabric, wherein the first press surface contacts the cellulosic web;
c) a means for creating a temperature differential between the first press surface and the second press surface to move water from the cellulosic web into the dryer fabric;
d) a transporting means for moving the cellulosic web in the machine direction at a first velocity;
e) a foreshortening means for foreshortening the cellulosic web after the web has passed through the compression zone;
f) sensor means for determining the cross-directional variability of a property of at least one of the cellulosic web, the first press belt, the first press surface, and the second press surface, wherein the sensor means generates an output signal based on the cross-directional variability of the property; and
,g) control means for decreasing the cross-directional variability of the property responsive to the signal from the sensor means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 65)
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46. A dryer section for a paper machine having a front end, a rear end, a machine direction, a cross direction, and a z-direction substantially normal to both the machine direction and cross-direction, comprising:
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a) an endless dryer fabric;
b) first and second press belts having opposing first and second press surfaces, respectively, through which the dryer fabric passes, adapted such that a web in contact with the dryer fabric and the first press belt can pass between the first and second press belts;
c) a pressing means for driving first and second press surfaces together to pressurize the web;
d) a temperature differential means for maintaining the first press surface at a higher temperature than the second press surface, whereby water removal from the web is enhanced by the resulting temperature differential;
e) a foreshortening means for foreshortening the web after the web is released from the pressure between the first and second press surfaces;
f) a sensor means for determining the cross-directional variability in a property of at least one the first press belt, the second press belt, the web, or a combination thereof, and generating a corresponding signal; and
,g) a control means responsive to the signal of the sensor means for decreasing the cross-directional variability of the property responsive to the sensor means. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. An apparatus for making a foreshortened cellulosic web, comprising:
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a) an impermeable first press belt having a first press surface, and a unitary second press belt operatively associated with a dryer fabric and having a second press surface and a backside surface opposing the second press surface, the second press surface being provided with pores for receiving condensate;
b) a press means for pressing the first and second press surfaces towards each other in a compression zone to compress a cellulosic web, wherein the first press surface contacts the cellulosic web;
c) a means for creating a temperature differential between the first press surface and the second press surface to move water from the cellulosic web into the dryer fabric;
d) a transporting means for moving the cellulosic web in the machine direction at a first velocity; and
,e) a foreshortening means for foreshortening the cellulosic web after the web has passed through the compression zone, wherein the unitary second press belt is porous throughout its thickness. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63, 64)
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66. An apparatus for making a foreshortened cellulosic web, comprising:
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a) an impermeable first press belt having a first press surface and a unitary second press belt operatively associated with a dryer fabric and having a second press surface and a backside surface opposing the second press surface, the second press surface begin provided with pores for receiving condensate;
b) a press means for pressing the first and second press surfaces towards each other in a compression zone to compress a cellulosic web, wherein the first press surface contacts the cellulosic web;
c) a means for creating a temperature differential between the first press surface and the second press surface to move water from the cellulosic web into the dryer fabric;
d) a transporting means for moving the cellulosic web in the machine direction at a first velocity;
e) a foreshortening means for foreshortening the cellulosic web after the web has passed through the compression zone;
f) a sensor means for determining the cross-directional variability of a property of at least one of the cellulosic web, the first press belt, the first press surface, the second press belt, and the second press surface, wherein the sensor means generates an output signal based on the cross-directional variability of the property; and
,g) a control means for decreasing the cross-directional variability of the property responsive to the signal from the sensor means.
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Specification