[in Japanese]

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Five kinds of raincoat cloths for ladies on the market were used to investigate the change fo waterproof properties by drycleaning and laundry.
The results obtained were summarized as follows:
1. Generally speaking, the raincoat cloths remarkably diminished their waterproof properties by the first cleaning and thereafter decreased exponentially with repeated cleaning cycles.
2. The water repellency and absorptivity are influenced by the quality of finishing agents. Especially, the labelling of the water repellency should be expressed clearly for consumers, because there are sometimes insufficient waterproof finished cloths on the market.
3. The waterproofness and permeability to air of cloths are influenced by their construction, especially the cover factor of them.
4. The laundry is rather desirable for the properties change of cloths than drycleaning except the degradation of cloths handle.
5. The labelling of waterproof finishing should certainly be expressed not only on the raincoat but also on their original cloths.

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Draped shapes of various kinds of fabrics show characteristic moiré patterns. Moiré patterns of node from eight samples have been photographed. The caracteristics of curve of various moiré patterns have been analysed as follows:
We approximate the curve of node by a polynomial. First, we obtainde a sequence of coordinates {a_i⁰} from the moiré photograph and then we take the progression of difference of first order {a_i¹} = {a_i+1⁰-a_i⁰} second order {a_i²} = {a_i+1¹-a_i¹}, and so son. Then the standard deviations of these progressions σ⁰, σ¹, σ², …… are calculated, and we determine the degree of the approximating polynomial ask, where is the minimum value of σ⁰, σ¹, σ², ……
The moiré patterns of nonwoven fabrics and cotton broad cloth are approximated dy the first degree functions, while silk habutae and staple fiber muslin by second degree functions. It is estimated that the quality of drapability can be represented by the quantity of standard deviation of the second order differences. The results of visual sensory test for drapability seems to agree with the above mentioned estimation.

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