Conventional stretch method for elongation test of knitted fabrics does not give accurate data at some points. We have developed new method for it, namely the method by inflation.
The tester for new method consists principally of cylinder, thin rubber on upper end of cylinder, pressure gauge, and elongation measure divice. Knitted fabrics are cramped on said rubber and compressed air is sent from compressor to cylinder. Fabrics then are inflated together with rubber by air pressure.This gives similar effect to that of free inflation of knitted fabrics. Therefore, this is proper method for the study of structure of knitted fabrics.
The results obtained.
1. Elongation of warp knitted fabrics by inflation is given by βk = Ewx Ec, where βk, Ew, Ec are constant, elongation of wale and elongation of course respectively.
2. The shape of inflated warp knit fabrics is that of ellipsoid of rotation just as rotated around major axis of wale.
3. The shape of inflated weft knit fabrics is that of convex body made by rotating convex curve around longitudinal axis : which curve is drawn when one ellipsoid is put on the other ellipsoid symmetrically : each ellipsoids takes wale and course in major axis.
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