Abstract


The weaving process depends upon a complexity of factors which include the material characteristics, the sizing ingredients, the sizing operation, and the yarn parameters. In today's environment when loom speeds have increased tenfold from those used in shuttle looms, the modern sizing process is based on various factors: modern control system for reproducible, optimal quality and easy handling. Individual drives and precise measuring systems, pre-wetting technology for a significant reduction in the amount of size and increase in the weaving efficiency, precisely controlled sizing, perfect beams for better weaving results, reproducible size preparation - manually or fully automatically. In this present paper the requirements in the sizing machines, how this can achieve conventionally, and what are the development has been taken place to overcome the difficulties associated with the conventional processes discussed reference with modern machinery.


Introduction


The old adage that sizing is the heart of weaving still holds good today. This statement is all the more important in todays environment when loom speeds have increased tenfold from those used in shuttle looms. The weaving process depends upon a complexity of factors which include the material characteristics, the sizing ingredients, the sizing operation, and the yarn parameters. Slashing tension on yarn during sizing, moisture content drying temperature, slashing machine parameters like slashing speed, size box characteristics, high pressure squeeze rolls, including hardness of rolls, type of sizing method, e.g., single end, cut method, foam method, amount of size, yarn tension, closeness of yarns all the important factors that come into play in deciding the performance of warp yarns during weaving. On the whole, the aim of the textile technologist is to produce "quality" fabric economically and efficiently. Here these terms refer to the production of fabrics up to the loom stage. The selection, evaluation, and performance of the warp (yarn/size system) for any specific fabric sett and the loom must be determined in the context of the developments and changes that have occurred in the spinning/winding/warping and the slashing processes. In the past four decades, the weaving industry has been subject to inordinate competition which has primarily come from the fashion (short runs), knitting, and nonwoven segments. The weaving machinery manufacturers answered the pressure of competition by concentrating on the design of looms that offered relatively very high speeds. To meet the demands of the higher productivity on the loom, the machine must be well controlled and improved for the material characteristics and the quality and efficiency of the preceding processes.


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