The structure of fancy yarn determines its process design requirements, and the process design requirements will determine its equipment modification. At present, the structure of fancy yarn can be roughly divided into two categories: the first category, mainly single yarn and Mainly double-stranded yarn, which is characterized by regular or irregular slugs or knots in the yarn length. Yarns, such as knotted yarn, snowflake yarn, corrugated yarn, filament slub yarn, short fiber slub yarn, etc.; the second category is mainly made of three or more yarns twisted together, and is characterized by the appearance of the yarn being a coil. Shape or spiral shape, such as bead circle line, circle line, wreath line, braid line, spiral flower line, pearl line, etc.
Generally, slub fancy yarns of various lengths are used in ordinary cotton spinning It can be spun on the factory’s modified carding machine, roving frame and spinning frame. Loop fancy yarns and spiral fancy yarns must be spun by transforming the spinning frame into a fancy twisting machine. From the perspective of scale efficiency and spinning quality, the twisting yarn modified by the spinning machineThe machine has many spindles, high output, and the pattern is not easily deformed after spinning. Here we mainly introduce some methods of converting spinning machines into fancy yarn equipment. The technical requirements for the first type of fancy yarn, namely knot yarn and slub yarn, are to twist two different yarns. The first process is to spin knot yarn and slub yarn; the second process is to spin knot yarn or bamboo yarn. The knot yarn is twisted with its matching ordinary yarn to form a knot line or slub line. The technological requirements for the second type of fancy thread, namely loop yarn and spiral yarn, are to be composed of three or more yarns. The fancy thread is divided into three parts. The first part is the core yarn, which is the entire fancy thread. The foundation and skeleton of the fancy thread is at the center of the fancy thread; the second part is the decorative yarn, which is the pattern component of the fancy thread. It is regularly wrapped around the core yarn shaft according to the process requirements, and the decorative yarn wraps The winding pattern directly affects the fancy effect of the fancy thread. The third part is the binding yarn, that is, the fixing yarn, which is wrapped outside the decorative yarn. It mainly fixes the pattern, enhances the effect of the pattern, and increases the wear resistance and strength of the pattern thread. In the first process, a fancy twisting machine is used to twist the decorative yarn and the core yarn according to a certain pattern into a floral yarn. In the second process, an ordinary twisting machine is used to twist the floral yarn and the binding yarn to form a floral yarn. Fancy twisting thread is commonly known as Erhua thread in production.
The structural characteristics of fancy twist yarn determines its spinning In terms of technology, during the transformation of spinning equipment, we focused on the transformation of three parts: (1) drafting part, (2) winding forming, and (3) tension control device.
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