How do wool filaments and warp breaks occur during the weaving process? How to prevent them?

1. The main factors that produce hair and menstruation

① The physical and mechanical properties of the raw material are not ideal, the fiber breaking strength is low, the breaking elongation is small and the unevenness cv value is high. Even after the sizing process, it cannot make up for the defects of the raw material itself, so the warp yarn The cohesion force is poor and cannot withstand the repeated friction of the reed and healds during the weaving process, resulting in fluffing or breakage of the warp filaments.

② In the warping, sizing, and doubling processes, the yarn guide is grooved or damaged, or the warp yarn is shaken or wrapped tightly when unwinding, causing damage to fiber strength and elongation, and deterioration of mechanical properties. When the production and processing tension When the yield value of strength and elongation is exceeded, the single fiber will break and the warp will break.

③ The reeds and healds of the loom are grooved and damaged, and the warp threads cannot withstand repeated high-frequency friction and become fuzzed and broken. The faster the loom speed is, the more serious the warp hair breakage will be.

④The warping machine’s wool monitor fails, allowing the wool and long knots of the raw material to escape, or the knots are too large and too long when the operator breaks the warp joint, and the warp threads on the warp surface are entangled during weaving, causing openings. Unclear, pull the head off.

⑤ When sizing the warp yarns, the permeability of the slurry is poor and the sizing rate is low. As a result, the warp yarns have poor cohesion and cannot withstand the high-speed reciprocating friction of the reed during weaving. In addition, the drying efficiency of the slurry in the drying room is low, and the sizing yarns cannot be dried. dry, resulting in a high moisture content of the warp beam; or the viscosity of the slurry is high, and when the weaving beam is unwound, the warp threads on the warp surface are tightly adhered, and the warp threads are pulled apart during the shedding process, causing damage to the warp thread serofilm. The single fiber is pulled, causing the warp to break. Factors such as warp thread sizing and wool thread entanglement will also cause fatigue due to warp thread stretching, resulting in warp hair breakage.

⑥When the loom is running, the opening height of the warp has a great influence on the warp wool and warp breakage, because when the loom opens, the elongation of the warp is proportional to the opening height. If the opening height of the loom is large, the warp will The elongation of the wire is large, and excessive elongation causes fluffing and breakage of the warp wire.

⑦ When the loom is running, the friction stroke of the healds also has a great influence on the warp breakage. When the heald frame is opened, the warp wires move toward the heddle eye, and when the shed is closed, the warp wires move backward from the heddle eye. The distance of this forward and backward movement is the friction stroke. The loom is continuously running, opening and closing in a continuous cycle, and the warp wires are constantly moving back and forth in the heddle eye and are subject to friction. It is also an important link in causing menstrual hair loss. In particular, the opening height is too large, the opening parts are worn, the movement of the heald frame is unstable, the healds move up and down, the loom speed is high, and the warp wires and hairs are broken, which is more serious.

2. Main measures to prevent hair loss and menopause

①According to different varieties andRaw materials are preferred based on quality requirements. After the raw materials enter the factory, they are first sampled for physical and mechanical performance testing, and then sprayed in the weft direction on the loom to make samples for the weavability and color absorption of the raw materials, which lays the foundation for the raw materials to be put into production and the rational formulation of finishing, slurry, and process parameters.

② Prefer water-jet slurry and reasonably set process parameters such as slurry concentration, elongation, drying temperature, unwinding and take-up tension, sizing rate and pulp shaft moisture content to enhance the warp cohesion.

③ The guide wire components, hair monitors, static eliminators, end-break automatic stops and other devices in the trimming, slurrying, and combining processes must be inspected regularly, and any problems found should be dealt with in a timely manner.

④ Strengthen the quality acceptance of reeds and healds, and do regular inspections, cleaning, maintenance and other management work.

⑤ Regularly inspect and repair the opening device of the heald frame of the loom to prevent wear of the opening parts, unstable movement of the heald frame and swaying of the healds.

⑥ In water-jet weaving, if smooth weft insertion can be ensured, the opening height should be as small as possible.

⑦The lathes in each process should strengthen their quality awareness. To improve the operating skills, the wire path must be clarified when joining warp wire breakage. When joining, the knots should be small and short, and the knots should not come off.