Pre-humidifying starching method for yarn

Abstract

The yarn pre-humidifying and sizing process includes one steam damping step of humidifying unwound yarn with steam, and one subsequent sizing step. The process has raised yarn impregnating power, and the sized yarn has great binding force between the sizing material and the yarn, improved sizing quality, high strength, high wear resistance and raised weavability.

Description

technical field [0001] The invention relates to a yarn sizing technology, in particular to a sizing method for pre-wetting and then sizing the yarn. Background technique [0002] At present, there are two kinds of warp yarn sizing methods used by textile production enterprises. One is the common sizing method in which the dry yarn is directly fed into the sizing tank for sizing. When sizing with this sizing method, it belongs to the air-solid sizing method between the air and the yarn. The interface is replaced by the liquid-solid interface between the size and the yarn, so the wetting and penetrating ability of the size is poor, which affects the quality required for sizing; on the other hand, due to the existence of cotton wax on the surface of the yarn, the surface tension of the yarn and The surface tension of the size is not much different, and the size is not easy to wet them. It belongs to a low-energy surface with low penetrating power. The yarn has a small adsorptio...

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Problems solved by technology

[0002] At present, there are two kinds of warp yarn sizing methods used by textile production enterprises. One is the common sizing method in which the dry yarn is directly fed into the sizing tank for sizing. When sizing with this sizing method, it belongs to the air-solid sizing method between the air and the yarn. The interface is replaced by the liquid-solid interface between the size and the yarn, so the wetting and penetrating ability of the size is poor, which affects the quality required for sizing; on the other hand, due to the existence of cotton wax on the surface of the yarn, the surface tension of the yarn and The surface tension of the size is not much different, and the size is not easy to wet them. It belongs to a low-energy surface with low penetrating power. The yarn has a small adsorption effect on the size, which also seriously affects the sizing effect of the yarn, and it is easy to cause uneven sizing. , the strength of the yarn decreases during production, the rate of yarn breakage increases, and it is accompanied by the phenomenon of nodding and sizing due to the small yarn adsorption force caused by the cotton wax barrier

Another commonly used sizing method is to pre-wet the yarn and then enter the sizing tank for sizing. Wet sizing is to install a water tank before the yarn enters the sizing tank to humidify the warp yarn before feeding Sizing tank sizing, although it can overcome the main defect of direct sizing of dry yarn, improve the penetration ability of sizing liquid on yarn, and help improve the sizing quality of yarn, but because a large amount of water attached to the surface of warp yarn will be carried into the sizing tank , which will dilute the size in the size tank, reducing the adhesion and stability of the size in the size tank. The sizing effect is greatly reduced; and because the sizing equipment needs to be equipped with a water tank and a yarn pressing and dewatering device, the equipment is lengthened, the structure is complicated, and the yarn path is lengthened, and the yarn breakage rate increases, which affects the quality of the sizing, making After sizing, the strength and wear resistance of the yarn are poor, and the weavability is also low

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