The glass transition temperature was known through the measurement of DSC scan o f PLA fiber.The curve reflected the relation between the dye up-take and dyeing temperature for three disperse dyes with different chemi cal structure, the results show that the optimum temperature of dyeing is 110 ℃.In addition, based on the dyeing characteristic of PLA fiber with 12 kinds of disperse dyes,i t can be concluded that the molecules is too small or there are too much polar g roup in dye molecule,both aren't favorable to dyeing. On the other hand,the pre se nce of acetate group seems to be beneficial to increase affinity of dye for PLA fiber,and thus render higher dye up-take.
To improve work efficiency of the preparation workshop in the textile industry, and to ensure acquisition of correct and real-time output and quality data of warping frames, in the local area network (LAN) environment, a data acquisition and management system for warping frames was developed via network technology, communication technology, database technology, and computer control technology, which can realize the remote on-line monitoring of production data and machine operating status. The system architecture, working principle and the main management functions were introduced, and the technical problems during the design process were solved by using transaction machinery, STL technology, etc. Meanwhile, real-time production data were fitted through using software filtering algorithms, and then the fitting results were compared and analyzed. A smoothing method with Newton difference was put forward to the collected signal. The system has been used in the textile industry, its core functions met the requirements of production management of the preparation workshop, furthermore, the real-time and correctness of production data were ensured.
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