The Fundamental Absorbency Mechanisms of Hygiene Paper
- 저자
- 고*찬, 성용길
- 게재저널
- Tappi journal 2016
- 키워드
- Absorbency, hygiene paper, tissue, towel, Lucas-Washburn Theory, surface roughness, contact angle, capillary flow, absorbency tester
- 개요
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A hygiene paper is characterized by having low density and low basis weight (i.e., weight per area). Its main constituent is colluose fiber, known as pulp. Since hygiene paper including tissue (i.e., bathroom- and facial- tissue), paper towel, and napkins has low density and low basis weight, it is thin like a paper sheet. A hygiene paper should be able to pick up liquid spills as fast as possible before it is disposed of. In short, its lifetime is extremely short, lasting only for a few seconds. The Lucas- Washburn theory has been validated from the absorbency data of some comercial tissue products available in the patent literature. The theory suggests that absorbency amount (Q) should be proportional to the square root of time, t1/2, in a plot of Q against t1/2. Such a plot is referred to as the Lucas-Washburn plot and the slope is known as the Lucas-Washburn slope, K. A higher value of K indicates a higher speed of absorption. The slope, K, is a function of the surface tension and the viscosity of the liquid, the wettability of the solid surface by the liquid, and the porous structure of the product. The wettability depends on the surface roughness (or profile) and the surface heterogeneity. Itis recognized that the absorbency measurement methods have been implemented, only a few have been standardized. The standardization of absorbency test methods is necessary to compare the products objectively without ambiguity.
- 첨부파일
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