Method for detecting water resistance of paper sheet

Abstract

The invention relates to a method for detecting the water resistance of a paper sheet. The method sequentially comprises the following steps: step 1, folding a paper sheet container into a paper sheet container; step 2, injecting water into the paper sheet container; and step 3, recording the time T from the water injection to the appearance of a first permeation point of the paper sheet container. The method has the advantages that the water resistance of the paper sheet is judged according to the time T so that the water resistance of the paper sheet can be quickly detected by only one timing device without a professional instrument in the whole detection process, the detection area is large, the water resistance of the whole paper web can be comprehensively detected, the water resistance can be effectively distinguished, and in addition, the detection method can quickly distinguish the specific area of the paper sheet which has the water resistance problem; and an operator can quickly check the corresponding area on the paper machine to find the problem according to the detection condition so that the production loss is reduced.

Description

technical field [0001] The invention relates to a method for detecting the water resistance of paper sheets. Background technique [0002] Paper is mainly composed of plant fibers. Plant fibers are lyophilic, that is, they are easy to absorb water. Except household paper, most paper types require a certain degree of water resistance. The current methods for testing the water resistance of paper are: GB / T 461.3-2005 Determination of water absorption of paper and board (water immersion method), GB / T 1540-2002 Determination of water absorption of paper and board (Kob method), GB / T460-2008 Determination of paper sizing degree, QB / T 2805-2006 Determination of the surface absorption rate of paper and cardboard. At present, various standards have high requirements for the test, and special instruments are required, which is not conducive to the judgment of the water resistance performance of the workshop production personnel, and the test has limitations. The detection area is sm...

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Problems solved by technology

[0002] Paper is mainly composed of plant fibers. Plant fibers are lyophilic, that is, they are easy to absorb water. Except household paper, most paper types require a certain degree of water resistance. The current methods for testing the water resistance of paper are: GB / T 461.3-2005 Determination of water absorption of paper and board (water immersion method), GB / T 1540-2002 Determination of water absorption of paper and board (Kob method), GB / T460-2008 Determination of paper sizing degree, QB / T 2805-2006 Determination of the surface absorption rate of paper and cardboard. At present, various standards have high requirements for the test, and special instruments are required, which is not conducive to the judgment of the water resistance performance of the workshop production personnel, and the detection has limitations.

The detection area is small and the randomness is large. The detection data can reflect the water resistance performance of ordinary products, but it cannot feedback the water resistance performance of heavy sizing products. Paper and ordinary sizing paper, the COBB value test room is 20-35g, the difference is not big, and its water resistance cannot be accurately evaluated. At present, most paper types are sizing by surface sizing. It is easy to have regional uneven distribution. For example, for a piece of paper with a width of 5m, due to the problem of surface sizing equipment, only the middle 20cm wide area has poor water resistance, and the rest of the area has good water resistance. At this time, it cannot pass the existing standard. To accurately evaluate the water resistance of the paper

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