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Creping blade

A scraper, apex technology, used in scrapers, textiles and paper, paper machines, etc., can solve problems such as productivity loss, tissue breakage and holes, and achieve the effect of excellent tissue quality consistency

Active Publication Date: 2009-07-22
BTG ECLEPENS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For larger gaps, or for lower grammages of the tissue, such gaps can cause web breaks and holes in the tissue with a consequential considerable loss of productivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] In a paper towel factory, experiments were carried out using three different types of scrapers. The first type (referred to as Type A) is a standard steel spatula, used as a reference. The second type (referred to as Type B) is Applicant's own prior art doctor blade (test blade designated "Proto-173") with a thermally sprayed anti-abrasion material applied to the working tip of the blade for Protect. A third type (referred to as Type C) is an improved coated blade according to the invention using similar wear resistant materials as the type B blades.

[0039] The following operating conditions were used in this test:

[0040] - Paper web made from 100% recycled fibers

[0041] -The final product is industrial toweling tissue (toilet paper)

[0042] - Weight: 27.5g / m 2 (without wet strength agent)

[0043] - Yankee speed: 750-850m / min

[0044] -Reel speed: 655-684m / min (i.e. 15-19.5% wrinkle rate)

[0045] - Yankee surface: cast iron

[0046] - Humidity: 7.0-6.7...

example 2

[0061] On another tissue machine, a comparative test was carried out using two different types of scrapers. The first type (referred to as Type D, with the test blade designated "Proto-C2PGA") was a prior art ceramic blade based on a standard geometry. The second type of doctor blade, referred to as type E, is a ceramic doctor blade according to the invention. Basically, the blade tip geometries of the two test blades were different from each other, but the protective material (ie the anti-abrasion material at the blade tip) was the same for both blades and applied under the same conditions.

[0062] The following operating conditions were used in this test:

[0063] - Paper web made from 100% recycled fibers

[0064] -The final product is industrial toweling tissue (toilet paper)

[0065] - Weight: 17.2g / m 2 (without wet strength agent)

[0066] - Yankee speed: 1470m / min

[0067] - Yankee surface: Voith Endura

[0068] - Humidity: 4.0%

[0069] - Size of crepe scraper...

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Abstract

A blade for creping a paper web from a dryer surface is provided, said blade having a sliding surface facing the dryer surface during use of the blade, a web impact surface upon which the paper web impacts during creping, and a working apex formed between the sliding surface and the web impact surface, wherein the working apex is located no more than 30 percent of the total blade thickness away from a neutral fiber of the blade. Preferably, the working apex of the inventive creping blade is located at or close to the neutral fiber of the blade. A method for manufacturing the blade is also disclosed.

Description

technical field [0001] The present invention relates to a creping blade having increased resistance to edge chipping and improved performance with respect to problems associated with edge chipping. The invention also relates to a method for producing such a doctor blade. Background technique [0002] Creping blades are commonly used in the paper industry to produce tissues. To generate the typical bulk that is characteristic of creped tissue, creping blades are typically used to move the paper web from a rigid heated dryer cylinder (often referred to as a Yankee dryer). Separated from the upper part, and at the same time exerts a pressure effect on the paper web. [0003] In this regard, it is desirable that the creping blades have a variety of properties. The creping blade should be able to overcome the adhesion forces that make the web stick to the dryer surface. At the same time, the doctor blade should create the desired crepe structure in order to give the tissue th...

Claims

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Application Information

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IPC IPC(8): B31F1/14D21G3/00D21G3/04
CPCD21G3/005B31F1/145
Inventor 亚历山大·克劳登
Owner BTG ECLEPENS
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