Abstract
Knitted fabrics are usually processed by heat-setting for the purpose of increasing its dimensional stability after knitting.
The tensile property of the knitted fabric after heat-setting depends strongly onits setting condition in general.
In this paper, a theoretical method for predicting the change of the property caused by heat treatment is presented by applying the biaxial deformation theory of inter lock fabrics developed by S. Kawabata and M. Niwa.
Following the theory, for the theoretical calculation of the tensile property, those data of the structure constants of the fabric and yarn properties such that tensile, compressional, frictional, bending and tortional are required.
In other words, if we know those constants and properties of the yarn processed, the tensile property of the processed fabric will be able to be calculated theoretically.
In this paper, the following method is examined : the structure constants of the fabric after processing is estimated from extension ratio of the fabric during processing, and the yarn properties of processed fabric are by measuring the properties of yarn which is processed by similar heat setting condition as fabric processing seperately from the fabric processing.
Two experiments are done. Firstly, the possibility of this method is examined by using the fabric processed by a factory.
That is, the structure constants of the processed fabric are measured and also the properties of yarn of its fabric is measured after processing, and from both of these data, the tensile property of the fabric was calculated theoretically. Good agreement has been obtained between theoretically calculated and measured results for the fabrics.
Secondary, the full procedure of the prediction above mentioned was completely carried out by a simplified processing designed by laboratory. The results theoretically calculated and experimentally measured showed also good agreement.
