A new shear tester of woven fabrics based on the trellis shear model is described. The tester can be used to carry out shear deformation experiments under quite low tensile stresses. The values of shear rigidity tested on the new tester were compared with those tested on the uniaxial tensile tester and the KES (Kawabata’s Evaluation System) instrument. The results confirm that the tester is more feasible and effective for measuring shear behavior in a natural state. This study establishes a foundation for constructing a universal instrument that can be used to measure shear deformation under any conditions.

Light transmission property of plain woven fabrics was studied in order to perform the fabric design considering the transmission. A light transmission measurement apparatus which could change incidence and receiving direction of light was developed and the change of the transmission factor by light direction was measured for plain woven fabrics. Because structures of the fabrics are anisotropy, the light transmission property showed anisotropy. The anisotropy of transmission factor was remarkable in large incidence angle, and the minimum or maximum values were showed every /4 cycle. An approximation curve of anisotropy was proposed and the anisotropic light transmission factor was estimated from a measurement at front of a fabric and structure of the fabric based on crimp theory of Peirce.(Received 9 December, 2003; Accepted 1 July, 2004)[4][5][6] [7] [8] 4 '

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