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Method for making smooth uncreped throughdried sheets
| Details |
Inventors: Engel, Steven Alexander; Rekoske, Michael John; Farrington, Jr., Theodore Edwin; Sudall, Stephen John; Williams, Paul Edward; Hyland, David Arthur;
Assignee: Kimberly-Clark Worldwide, Inc. (Neenah, WI)
Primary Examiner: Lamb; Brenda A.
Assistant Examiner:
Attorney, Agent or Firm: Croft; Gregory E.
Uncreped throughdried cellulosic webs having improved smoothness and stretch are produced by transferring a newly formed web from the forming fabric to a slower moving, high fiber support transfer fabric, preferably using a fixed gap or kiss transfer in which the forming fabric and the transfer fabric converge and diverge at the leading edge of the transfer shoe. The web is then transferred to a throughdrying fabric and throughdried to final dryness, producing a web having an improved softness due to increased surface smoothness. |
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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.
) Shown is a 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.
After formation, the forming fabric carries the wet web 15 to an optional hydroneedling station 16 where the web can be hydroneedled to increase its bulk.
Suitable means for hydroneedling are disclosed in U.
S.
Pat.
No.
5,137,600 issued Aug.
11, 1992 to Barnes et al.
and entitled "Hydraulically Needled Nonwoven Pulp Fiber Web", which is herein incorporated by reference.
Such means provide a multiplicity of pressurized water jets which impinge upon the surface of the newly-formed wet web while supported on the forming fabric, causing an increase in the porosity of the web and hence an increase in bulk.
Whether or not the optional hydroneedling operation is used, 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 Fourdrinier former illustrated is particularly useful for making the heavier basis weight sheets useful as wipers and towels, although other forming devices can be used.
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 as described hereinafter with reference to FIG.
3.
The transfer fabric passes over rolls 33 and 34 before the wet web is transferred to a throughdrying fabric 19 traveling at about the same speed, or a different speed if desired
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Manufacturing Materials 
