ON TESTING METHODS OF NON-WOVEN FABRICS

(I) MEASUREMENT OF THE THICKNESS

Abstract

In recent years, the research on non-woven fabrics has greatly been developed, but because they have both properties like the paper and the cloth, there are no unique testing methods on them up to this time.
In considering of this point, the author has established the testing methods which shown the properties of non-woven fabrics comparatively adequately and at the same time considered to serve in development of non-woven fabrics in future.
First, the apparent thickness was finished to be able to be measured. Hitherto, the thickness of non-woven fabrics has been measured by using dial thickness gauge of pressure-gauge type, while now the apparent thickness in the condition just as bulky products bacame to be able to be measured by using the tester of photometric type to measure irregularities of the thickness produced newly by the author.
Then, as a result of that the relation between the thickness measured directly by pressure-gauge type and the apparent thickness measured by photometric type was investigated, it appeared that the proportional relation passed through the origin did not necessarily exist between them. Therefore, it is not proper that various properties of non-woven fabrics are studied in the relation with the thickness measured by pressure-gauge type as this time, and in future it may be more significant that they are studied in the relation with such apparent thickness.