Wet crepe, impingement-air dry process for making absorbent sheet

a technology of absorbent sheet and impingement air, which is applied in the direction of drying, non-fibrous pulp addition, light and heating apparatus, etc., can solve the problems of difficult web practice, wet crepe, throughair dry process not meeting substantial commercial success, etc., and achieves low permeability and greater manufacturing flexibility.

Inactive Publication Date: 2002-08-08
GPCP IP HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0006] There is provided in accordance with the present invention a method of making absorbent sheet by way of a wet-crepe process wherein the wet-creped web is after-dried with an impinging stream of heated air or a heated gas stream. Unlike through-dry processes, after drying with impinging air can be accomplished on a web with relative...

Problems solved by technology

Due to low heat transfer coefficients, can drying after a crepe operation can be expensive both in terms of operating costs and capital investment.
Wet crepe, throughair dry processes have not met with substantial commercial success since the process rates, product quality and machine product...

Method used

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  • Wet crepe, impingement-air dry process for making absorbent sheet
  • Wet crepe, impingement-air dry process for making absorbent sheet
  • Wet crepe, impingement-air dry process for making absorbent sheet

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0087] Example 2

[0088] A web was produced as described in Example 1 of the same fibers and furnish, except that the hoods were cooled down to reduce the dryness of the sheet at the creping blade. A nascent web was deposited on a pressing felt and pressed to a solids content of 44%, prior to being adhered to a Yankee dryer. The web was creped from the Yankee dryer at a solids content of 55% and a blade bevel of 15.degree.. The web was subsequently pulled out using a pair of calender with rolls very lightly nipped with a resulting crepe of 15% left in the sheet. Percent crepe was calculated as:

Yankee Speed--Calender Speed Yankee speed

[0089] The sheet was then collected and dried to a solids content of about 95% while held in restraint by sheet restraining / drying racks at room temperature. This restrained drying technique was used determine a characteristic void volume which is set forth in Table 1. Multiple fabric can drying could also be used by might not exhibit such a dramatic effe...

example 3

[0090] Example 3

[0091] A web was produced as in Example 2, except that the creping was carried out using a 10.degree. bevel blade.

example 4

[0092] Example 4

[0093] A web was produced as in Example 2, except that the creping was carried out using a 0.degree. bevel blade.

[0094] The above examples establish that this process responds much like a normal dry creping process, but the low internal cohesion of the fibers in the web due to its wetness amplify the creping effects.

[0095] It was quite surprising that the coating on the Yankee surface never changed through out the above examples. Similar processes carried out on a cooler Yankee resulted in significant changes in the coating on the Yankee making the coating difficult to establish and to maintain.

[0096] In the process according to the present invention, the amount of wear observed on the creping blade was significantly reduced below that which one would expect from a wet crepe process. By way of illustrative example, crepe blades used in wet creping processes would often be worn out in as little as 30 minutes, while the creping blade in the process according to the pre...

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Abstract

A wet crepe, impingement-air dried process for producing absorbent paper sheet is disclosed. In preferred embodiments, the process utilizes recycle furnish and the web is delaminated as it is wet-creped from a Yankee dryer. Particular embodiments include high consistency (after-crepe) wet-shaping prior to impingement air drying on a drilled vacuum roll.

Description

CLAIM FOR PRIORITY[0001] This application claims the benefit of the filing date of U.S. Provisional Patent Application Serial No. 60 / 171,070, filed Dec. 12, 1999.[0002] The present invention relates to methods of making absorbent cellulosic sheet in general, and more specifically to a wet crepe process wherein a web is dewatered, thereafter creped and dried with an impinging gaseous stream on a rotating cylinder.[0003] Wet crepe processes for making absorbent sheet, such as tissue and towel products, are known in the art. There is disclosed, for example, in U.S. Pat. No. 5,851,353 to Fiscus et al. a method for can drying wet webs for tissue products wherein a partially dewatered wet web is restrained between a pair of molding fabrics. The restrained wet web is processed over a plurality of can dryers, for example, from a consistency of about 40 percent to a consistency of at least about 70 percent. The sheet molding fabrics protect the web from direct contact with the can dryers and...

Claims

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Application Information

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IPC IPC(8): D21F1/44D21F5/18D21G3/00
CPCD21F1/44D21F5/181D21G3/005
Inventor WATSON, GARY M.
Owner GPCP IP HLDG LLC
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