Synthetics filament is compounded by a number of single fibers, such as 165dtex/48f that is, from 48 single fibers combined into 165dtex compound filament, in the production process, the wire in the state of force to go through the complex, and, twisting, and rectification of the various processes, and in the process of weaving, to be subjected to the guide rollers, heald, reed repeated friction, wire friction as many as 10,000 times more than the water-jet weaving machine weaving speed is generally 500~700r/min, high speed friction monofilament is very easy to lint, not only affecting the efficiency of weaving, which can seriously lead to the inability to weave, and make the product quality significantly lower.The speed of water jet weaving machine is generally 500~700r/min, high speed friction monofilament is very easy to hair, not only affect the efficiency of weaving, serious will lead to can not weave, and make the quality of the product is obviously reduced, for this reason, no-twist or low-twisted synthetic filament sizing, sizing after the warp yarn can be subjected to the friction of the processing process and weaving, and to ensure that the quality of the product.
The mechanism of sizing is: after sizing, the slurry forms a layer of slurry film around the silk body to resist the friction of various equipment; and the slurry penetrates between the single fibers, the single fibers will be stuck to improve the cluster of filaments and strength, so as to ensure the smooth completion of the tasks of the latter process. Staple fiber yarn due to hairiness, the sizing effect requires the pulp to cloak the main, synthetic filament sizing to penetrate the main and to cloak as a supplement. Due to the low moisture return rate of synthetic filaments, such as polyester filament standard moisture return rate of 0.4%, nylon 4%, they belong to the hydrophobic fibers, that is, the water is not affinity, and thus its sizing is not as easy as viscose filament, which must meet the two conditions: that is, the viscosity of the paste to be particularly good, the paste in the infiltration of monofilament fiber between the single fiber will be able to stick each other to ensure that the acquisition of a satisfactory set of properties and the formation of a good film of paste around the silk body to ensure that its good abrasion resistance. Ensure its good abrasion resistance. When sizing the filaments, it is necessary to ensure that there is a certain distance between the sizing filaments to prevent the sizing of the compound filaments from sticking to each other and not being able to weave.
Sizing should strictly control the sizing of the pulp preparation and sizing process. At present, the domestic pulp with acrylic ester, the quality has generally passed, but to make a rigorous selection, especially its viscosity and concentration should meet the requirements, do not blindly shopping. In order to prevent the silk in the pulp process on the silk body of the antistatic agent is removed, so in the pulp to add an appropriate amount of antistatic agent.
In order to maintain the softness of the silk, a certain amount of softener can be added, but also add an appropriate amount of penetrating agent and defoamer. In the pulping process should be strictly in accordance with the specified pulping operation procedures, so that the pulp meets the requirements of production.
In the production process should be in accordance with the requirements of the sizing process, to achieve "seven", namely, fixed pulp viscosity, fixed pulp concentration, fixed pulp temperature, fixed sizing line speed, fixed pulp elongation, fixed pulp moisture rate (fixed drying cylinder or drying room temperature), fixed sizing rate. Viscosity is the degree of good or bad viscosity of the slurry, and concentration is expressed in the slurry containing the number of solid gum, generally speaking: the two are directly proportional to the quality of the slurry, but due to the quality of the slurry, even if it is the same concentration of slurry, the viscosity is not the same, so strictly speaking, the two have to be controlled, and the eye of the usual production, and often some people only control the viscosity, and some people only control the concentration. The higher the viscosity and concentration of the pulp, the higher the strength and surface abrasion resistance of the silk increased, while the elasticity is low, the silk is more likely to be brittle breaks, drop pulp is also more, so it is necessary to correctly control. Sizing line speed is too fast, although the production efficiency is high, but due to the silk strip penetration is not as good as and poor coating, the quality of pulp deterioration. Warp in the sizing due to the rollers, sizing rollers and drying barrels and other pulling, generally showing an elongated state, but polyester, nylon and other synthetic fibers is a heat shrinkage of the fiber, the silk body through the pulp tank, drying barrels and hot drying room will produce retraction, and thus synthetic fiber silk sizing rate is generally stretch and retraction offset, elongation of about 0, the pulp stretch is large, the silk body is elongated, the strength of a certain degree of influence, easy to break the head, but the pulp stretch is small, the silk body is subjected to weaving But the pulp stretch is small, the silk body by the weaving of the tension on the machine, will be stretched and destroy the pulp film, the fiber is easy to hair. Sizing rate is high, the silk body is easy to produce sticky ride, uneven contraction of the silk strip, resulting in hanging loose warp, hardness, and in severe cases, will produce cracked shaft, but the low rate of sizing, it is easy to produce static electricity, resulting in fiber pilling, and due to the hardening of the pulp film, brittle, brittle broken warp. Sizing rate of high and low on the quality of pulp silk has a great impact, if the sizing rate is high, the pulp in the body of good permeability, good sizing quality. But the sizing rate is too high will produce a hitch, or even can not weave, while the sizing rate is small, the silk fiber is easy to hair. So from the practice of production, to find out the best sizing process, and practical implementation, which is to ensure the quality of sizing and product quality is an important measure.
At present, the automation control technology of the pulping machine is high.Only the required process parameters will be input into the computer monitoring system, it can be automatically controlled and online detection, but also the image can be displayed on the infrared touch screen, automatic recording, the important thing here is that the technicians need to lose the correct process parameters, and according to the recorded data and the actual situation of the production of timely correction of process parameters.