Effect Of High-speed Shearing On The Properties Of Size Solution And Size Film

The paper studies a new technique of high-speed shearing homogenization for warp sizing, which is urgently required in the development"green size"in textile trade. This technique has been initially applied to textile industries.According to correlative literatures, the homogenization functions on the performance of size solution and size film by comparing and analyzing in both internal and international industries. As a result, the homogenization with the high-speed shearing is adopted as the method of enhancing the sizing behaviors.The order of high-speed shearing homogenization on the properties of single size solution and film is researched in the article. The conclusion is obtained: high-speed shearing decreases the viscosity of starch paste, increases the adhesive ability and film performance. Based on researching the relation between starch sizes and the rotation speed, time of shearing, the parameter for achieving stronger adhesion is found by treating the paste with shearing at a rotate speed of 6000 r/min, in a period of 10min. However, the high-speed shearing has no effect on the performance of the synthetic size agent.The paper also studies the performance of pastes and films of starch-synthetic size, especially for the blended pastes involving PVA. Our experiments demonstrated that the adhesive ability, film property, and compatibility of starch-PVA blended sizes increase after the homogenization of high-speed shearing. In addition, the performance of the size pastes and films of starch and acrylic size has been improved by the shearing.According to the recipe used in cotton and/or cotton/polyester blend yarns in ordinary factories, the performance of starch,PVA and acrylic blended size is researched through high-speed shearing. It was found that the performance of the blended size pastes and film has been enhanced after high-speed shearing, which is feasible to practical application.The influence of high-speed shearing upon the sizes of starch particle and upon the behaviors of sized yarns is evaluated. It is demonstrated that high-speed shearing reduces starch particle size and improves the properties of sized yarns.