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        Company News Industry News

        Common Maintenance Skills of Water-jet Weaving

        2019/8/17 18:06:12

        (1) Head feathers of lower head weft, check whether the upper scissors or reed blades are sharp and smooth.
        (2) When the machine stops, the weft yarn is touched. See if the head of the first weft is hooked on the top or bottom of the warp opening, the upper water line is lowered, and the lower one is reversed.
        _The first short latitude, see the size of P value and water cut size. 9MM spring 1 coil equals 4.23KG P value; 9.5MM spring 1 coil equals 5.3KG P value. Water cut is to check the water line from thin edges to thick, about 145-185. 20-30D nylon multi-arm water cut small, the top is not easy to wool warp, nylon sand P value should be large, break through the feathers on the warp to let the weft fly safely in the free flight angle! Mechanical restraint angle should be well controlled. The ratio of restraint angle and water to CC should be controlled at about 0-30 degrees, too large will short sand, too small will short latitude, too long advance water will cause water exhaustion, winding and empty stop of weft head and sand breakage of weft storage strand; too short transport force is not short latitude enough!
        _The basic technology is not up to the standard, and the machine is prone to warp and shutdown. Different warp D numbers have different backbeams, different angles of rollers and different stretching forces. Different number of weft sand D uses different nozzles, different types of pumps, and different setting of weft insertion!
        Silk industry water jet weaving process is prone to filament winding broken ends, slurry drop, abnormal woven jitter, crack shaft and other phenomena, I believe many enterprises have encountered similar problems, we will discuss the causes and propose corresponding solutions.
        1. Wool winding broken ends
        In the weaving process, nylon, polyester and other synthetic filaments are easy to form a piece of wool near the heald frame and reed. Often, only a few single fibers of a multiple filament are not broken, while other fibers are cut like knives. Several multiple filaments are "cut" together to form a piece of wool and produce winding fragments.
        The main reason for this phenomenon is that the tensile strength of synthetic fibers is high, while the shear strength is low. When one filament is twisted on another filament and two filaments are separated in the opening process, the filament is not easy to break because of its larger tensile strength, but the twisted fibers are "cut" because of its lower shear strength, especially untwisted or low-twisted filaments, which have poor cohesion between the fibers, and the cut fibers are twisted again. His fibers, therefore, "cut" more single fibers, if not handled in time, will accumulate into a piece of wool.
        In order to prevent filament from winding and breaking, it is necessary to avoid filament production during preparation and weaving. That is to say, the following things should be done:
        (1) Strictly control the processing tension of the yarn in the preparation process. On the premise of good shaping, the processing tension of the yarn should be slightly smaller. If the tension is too large, the yarn will retract because of the loss of tension after processing, while the tube wall will prevent the retraction, resulting in the phenomenon of single fiber "cracking" which is difficult to detect visually, except according to the yarn. In addition to tension control processing, the simplest way is to press the barrel body with thumb and middle finger. It is better to have a slight depression in the silk thread, and to prevent the hard barrel.
        (2) Wire guide should be smooth, wear-resistant and select high-performance ceramic materials which are not easy to generate static electricity, so as to avoid the fiber being broken in processing. Particularly to prevent the use of magnetic materials, because it is smooth, but soft, can not withstand the friction of synthetic fibers, will hair, will wear synthetic fibers.
        (3) On the premise of non-sticking, the slurry has good film-forming and penetration, and the filament with good film-forming can withstand the friction of heddle and reed teeth, while the filament with good penetration has good clustering. Under the condition of a few broken filaments, it can stick multiple filaments together, thus avoiding the production of wool.
        (4) The density of the heddle at the heald frame should not be too high. According to practical production experience, if the density of the heddle is greater than 8/cm during weaving, it is likely to produce wool due to repeated opening, friction between the silk thread and the heddle wire, silk thread and silk thread. Therefore, the simplest way to increase the number of heddle frames appropriately is to use double steel bars, i.e. one heddle. Two steel bars are installed on the frame, and the warp wires are separately penetrated into each steel bar, which can reduce the density of the heddle wires and prevent the production of wool. And the heald frame should be regularly replaced to prevent the warp yarn from "splitting" because of the roughness of the heald yarn.
        (5) Weaving workshop should maintain a certain temperature and humidity to prevent the increase of wool due to static electricity generated by workshop drying. Relative humidity should be high and can be controlled to 70%-80%.
        2. Dropping
        In water-jet loom weaving, white paste or granular sticky condensate, namely slurry drop, often occurs at the heddle and reed. These slurry drops make the warp yarn rise and fall poorly at the opening, resulting in unclear shuttle opening, warp breakage, weft breakage, etc. In serious cases, weaving defects will also occur, affecting product quality and weaving efficiency.
        Measures to prevent slurry falling:
        (1) The quality of slurry must be up to the standard and every test index must be qualified; the slurry can not deteriorate; the general slurry dosage is 7% and the water content is 100%. The viscosity of the slurry must be up to the requirement, and there must be no impurities in the slurry and additives.
        (2) In order to meet the requirements, the water used for mixing should be softened first, and the water hardness should be kept below 30 mg/kg; the boiling barrel and the boiling barrel should be washed; the basic steps of mixing are as follows: 75% water is put into the boiling barrel, the agitator is started at the speed of 80-120 r/min, and the water is heated to 50-60 C, put into the slurry, stir for 15-20 minutes, and add Add the adjuvant, stir for 15 minutes, add water to 100% and ready to use.
        (3) In sizing process, the viscosity and concentration of slurry should be properly and strictly controlled. During sizing process, the viscosity of slurry will increase due to evaporation of water. Water should be added to prevent the increase, or circulating slurry should be used to prevent the rapid increase of viscosity. If the supply time of slurry barrel and sizing barrel is too long, low-speed stirring should be carried out to prevent the slurry from rising in the lower layer. Sedimentation, resulting in low slurry viscosity of service layer

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