半糊化浆纱技术的上浆机制

半糊化浆纱技术是基于使用淀粉为主浆料、浆纱工艺采用中温调浆、浆槽不加热的一种新型浆纱技术。本文通过采用扫描电镜系统对半糊化浆纱表面淀粉浆料糊化状况、浆纱横截面浆液浸透状况的观察，提出了半糊化上浆技术的机理。研究结果表明，半糊化浆液中含有一定量糊化了的浆液和大量未糊化的淀粉颗粒，完全糊化了的淀粉浆液由于黏度小而容易浸透到纱线内部，大量吸水而未糊化的淀粉颗粒粘附在纤维和纱线表面，浆纱烘燥时，黏附在纤维和纱线表面未糊化的淀粉颗粒破裂被覆到纤维和纱线表面，并与浸透到纤维之间的浆液发生粘结，浸透到纤维之间的糊化浆液成为表面颗粒淀粉糊化后粘附的“根”，使得浆膜对纱线形成了包覆。

Mechanism of part-gelatinization sizing technology on yarns

Part-gelatinization Sizing Technology (PGST) is a novel technology to size yarns by using part-gelatinized starch sizing agents in a medium temperature conditions. In this paper, the microstructure of sizing membrane formed both on the yarn surface and in the cross-section of the sized yarns are examined by using SEM, the mechanism of the formation of sizing membrane on the surface of yarns in PGST are thus proposed. It is found that sizing slurry prepared in PGST contains a certain amount of fully-, or partially-gelatinized starch sizing agents and a greater amount of not gelatinized starch particles; the gelatinized starch sizing pulp has low viscosity is easier to penetrate into voids inside yarns while the not gelatinized starch particles are superabsorbent against water deposited on the surface of the yarn. During drying process, the saturated, not gelatinized starch particles deposited on the surface of the yarn to form sizing membrane jointed with the gelatinized starch inside the yarns. Such a complex membrane structure covered the whole fiber surface within and on the surface of the yarns. Key words part-gelatinization sizing technology (PGST); mechanism of sizing membrane formation; starch sizing materials