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Soft tissue
| Details |
Inventors: Farrington, Jr., Theodore Edwin; Bahlman, Julia Smith; Burazin, Mark Alan; Chen, Fung-jou; Goerg, Kristin Ann; Hermans, Michael Alan; Makolin, Robert John; Rekoske, Michael John;
Assignee: Kimberly-Clark Worldwide, Inc. (Neenah, WI)
Primary Examiner: Lamb; Brenda A.
Assistant Examiner:
Attorney, Agent or Firm: Croft; Gregory E.
Soft throughdried tissues, which are sufficiently soft to serve as premium bathroom tissues, can be made without the use of a Yankee dryer. The typical Yankee functions of building machine direction and cross-machine direction stretch are replaced by a wet end rush transfer and the throughdrying fabric design, respectively. It is particularly advantageous to form the tissue with chemimechanically treated fibers in at least one layer. The resulting tissues have high bulk (about 6 cubic centimeters per gram or greater) and low stiffness. |
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DETAILED DESCRIPTION OF THE INVENTION Directing attention to the Drawing, the invention will be described in further detail.
FIG.
1 illustrates a means for carrying out the method of this invention.
(For simplicity, the various tensioning rolls schematically used to define the several fabric runs are shown but not numbered.
It will be appreciated that variations from the apparatus and method illustrated in FIG.
1 can be made without departing from the scope of the invention.
) Shown is a twin wire former having a layered papermaking headbox 10 which injects or deposits a stream 11 of an aqueous suspension of papermaking fibers onto the forming fabric 13 which serves to support and carry the newly-formed wet web downstream in the process as the web is partially dewatered to a consistency of about 10 dry weight percent.
Additional dewatering of the wet web can be carried out, such as by vacuum suction, while the wet web is supported by the forming fabric.
The wet web is then transferred from the forming fabric to a transfer fabric 17 traveling at a slower speed than the forming fabric in order to impart increased stretch into the web.
Transfer is preferably carried out with the assistance of a vacuum shoe 18 and a fixed gap or space between the forming fabric and the transfer fabric or a kiss transfer to avoid compression of the wet web.
The web is then transferred from the transfer fabric to the throughdrying fabric 19 with the aid of a vacuum transfer roll 20 or a vacuum transfer shoe, optionally again using a fixed gap transfer as previously described.
The throughdrylng fabric can be traveling at about the same speed or a different speed relative to the transfer fabric.
If desired, the throughdrying fabric can be run at a slower speed to further enhance stretch.
Transfer is preferably carried out with vacuum assistance to ensure deformation of the sheet to conform to the throughdrying fabric, thus yielding desired Bulk and appearance.
The level of vacuum used for the web transfers can be from about 3 to about 15 inches of mercury (75 to about 380 millimeters of mercury), preferably about 5 inches (125 millimeters) of mercury
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Manufacturing Materials 
