(1) The position of the rear beam (C28) is too low. After opening, the tension difference between the upper and lower warp yarns is too small. When the weft yarn shrinks, the warp yarn cannot easily move laterally with the weft yarn. Therefore, the gap between the reed teeth cannot be filled after beating up, resulting in square holes in the cloth surface
(2) The left and right sides of the back beam are not level. , the warp yarns on both sides are different, and the fullness of the fabric on the side with greater tension is affected, resulting in square eyes.
(3) The warp stop frame is too close to the cloth fell. The tension at the press mouth increases, making it difficult for the warp yarns to move and shift, resulting in square eyes.
(4) The lifting harness is too high or the side brace (L44) is too low. Both situations will reduce the tension difference between the upper and lower warp layers. The cloth surface is prone to full-width and square edges.
(5) The hanging heddle is too tight, which makes it difficult for the warp yarns to swim in the heddle eyes during beat-up. During beat-up, the increase in warp yarn tension in the beat-up area cannot be compensated, and the warp yarns are damaged, and the surface of the fabric is damaged. The appearance is thin and not plump, and in severe cases, square eyes will form.
(6) The heald iron stems are bent, causing the heald eyes to be on the same water trunk line, and some convex healds will also have square eyes.
(7) The heald clip at the lower end of the heald frame is damaged or missing, keeping the lower warp yarns away from the shuttle board.
(8) The warp tension is too large, which means that the tension difference between the upper and lower warp layers is greatly reduced.
(9) The brake discs (F216) in the starter joint are not in close contact with each other, causing gap slip during weaving, especially when beating up, the resistance is large. The slip increases, weakening the beating force and causing square holes in the cloth surface.
(10) The opening time is improperly configured. If the opening time is early, the angle of the warp yarn to the weft yarn is relatively large. After beating up, the weft yarn is not easy to push back and retreat, and the cloth surface is relatively plump and has a thick feeling. If the shedding time is late, the warp tension will be small, and the tension will also be small during beat-up. If some warp threads are too loose, the cloth surface will be uneven. In addition, due to the late opening, the tension difference between the upper and lower warp layers is small. The upper warp yarn is not easy to move sideways, so square holes will appear on the cloth.
(22) The contact position of the stop stopper nozzle (K23, K27) is out of specification, the reed clamp shaft hook foot (K26) fails or the reed is loose, causing the steel bar to recede due to the reaction force of the cloth surface when beating up. The weft yarn cannot reach the specified position, causing square eyes.
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