Use of menstrual tablets
There are two types of stop pieces used in shuttleless looms: open type and closed type. For closed-end warp stops, use a heddle threading hook to guide the warp yarn through the threading hole in the middle of the warp stop piece during warp threading; while for open-end warp stops, it can be inserted directly on the loom, which is more convenient to use. When the machine is stopped, the warp stop piece and warp stop rod can be removed and continued to be used, thus reducing the consumption of the warp stop piece.
1. General principles for selecting warp stop pieces
When selecting the size, shape and weight of warp stop pieces, it should be determined by factors such as fiber raw materials, spinning yarn characteristics, loom type and loom speed. , Generally speaking, when the spinning yarn has a large number of yarns and the speed is fast, a heavier stop piece is used, otherwise a lighter stop piece is used; the warp stop piece for wool weaving is heavier, and the warp stop piece for silk weaving is heavier. light. Fabric varieties produced for a long time and in large quantities generally use closed warp stops; varieties that are frequently changed and in smaller batches use open warp stops.
The relationship between the weight of the stop piece of the shuttleless loom and the characteristics of the spinning yarn is shown in Table 9-4.
2. Density of the warp stop piece
The appropriate density of the warp stop piece worn on the warp stop rod is related to the thickness of the warp stop piece. However, the thickness of the warp stop piece depends on the special number of warp yarns. Each warp The arrangement density of the stop pieces on the stop rod is calculated by the following formula:
In cotton weaving production, the maximum arrangement density of warp stop pieces on each warp stop bar is related to the special number of spinning yarns. If the special number of spinning yarns is small, the density of warp stopping pieces can be larger; the special number of spinning yarns Large, the density cannot be too high. The relationship between warp stop density and spinning yarn characteristics is shown in Table 9-5.
3. The method of threading the stop pieces
In the weaving process, the stop pieces are determined based on the number of stops on the loom, the fabric structure and the draw-in method to ensure that the warp yarns do not interact with each other during weaving. Squeezing can also ensure that the warp stop piece falls down smoothly in time when the warp yarn breaks. Usually there are smooth wearing method and flying wearing method. The selection of wearing method is based on the principle of meeting the requirements of the fabric and making it easy to wear the heddle.
4. Use of warp stop pieces
New warp stop pieces are perfectly smooth and straight, and are used on high-end fabrics. The old warp stop pieces that have been used can still be used after selection, or can be used after repair, and are used in low-end fabrics. fabric to reduce consumption.
1. Precautions for loading the warp stop piece on the machine
When operating the upper shaft, check whether the warp stop piece rope is firmly tied, and then gently put it into the warp stop frame slot one by one in order. Do not lift it too high to avoid Disorganize the warp yarns, and make sure the middle bracket yarns are divided evenly on both sides. Each warp stop piece must be sensitive in the warp stop frame; the head end of the warp stop frame and the scoring rod of the warp stop frame cannot collide, and the droop slope should be symmetrical in two rows and two columns.
2. Causes and overcoming measures for late warp breaking and falling pieces
(1) When weaving coarse and medium special yarns, vinylon and viscose yarns, floral fabrics are easily stuck in the warp stopping grooves, which affects timely falling pieces. . During the circuit behind the car, the operator should use his hands to move the warp stop piece to scatter the floral fabrics. When neps and impurities are found, they should be removed in time.
(2) High warp-density fabrics such as polyester card, polyester poplin, etc., due to their high density, the warp yarns squeeze each other during weaving, making it difficult for the pieces to fall off in time. Therefore, the way the warp stop pieces are worn can be changed to reduce the squeeze, which is beneficial to Drop the film in time.
(3) The discontinuation of the tablets will cause confusion and uneven density, which will affect the timely dropping of the tablets. Therefore, it is not allowed to mess up the warp stop piece when operating the upper shaft. The yarn separation of the middle bracket should be even on both sides, and the warp yarn should be in a straight line from the back beam to the cloth fell.
3. Reasons for the abnormal wear of the warp stop piece
(1) The abnormal wear of the yarn threading eye of the warp stop piece is due to the excessive sand particle size in the warp slurry.
(2) The warp stop piece is crushed or cracked. This is due to the poor function of the automatic stop device for warp breakage of the loom, or the weaving stopper accidentally crushing the falling piece when looking for a broken end.
(3) The reason why the stop plate is rusty is because the humidity in the workshop is too high and the recycling is not done well.
(4) The film is stopped without finishing and cleaning, poor management, etc., resulting in abnormal losses.
(5) Improper process design causes the warp stop piece to jump and cause abnormal wear.
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