Elastic bamboo woven fabric is a new type of product developed on the air jet loom based on the market demand and the characteristics of elastic fabric and bamboo woven fabric. The warp thread of this kind is usually made of regular yarn or slush yarn. Variety has a dual characteristic of bamboo fabric and elastic fabric, have good resilience, wet gas absorption and obvious concave and convex stereo feeling, feel is good, wearing comfortable, deeply the general consumer's affection, has broad market prospects.
Fabric specification C29.2 / C29.2 (78dtex) 275.5/220.5 180 elastic bamboo sheeting. The ground is formed by the horizontal lines, while the side is organized to double the second and lower latitudes. The total number of roots is 4,980, of which 60 square roots of the square root are X2. The warp yarn is C29.2 Tex yarn, and the bamboo section is used in a variety of changes, with average length of 6.0 cm, and the average pitch length is 46.7 cm, and the section is 2.5 times of normal yarn. The weft yarn is a C29.2 (78dtex) slug slub, with a length of 5.3 cm, and the average pitch is 29.8 cm, which is 2.5 times the normal yarn.
The technical difficulties of producing slub yarn by air jet loom
With the unique style of the slub, the fracture strength decreased significantly compared with the normal yarn. In the process of production and processing, it is easy to break because of repeated machine drawing and friction, making it difficult to produce.
Because of slub roughness is about 2.5 times that of the normal part, ribbed torque is much bigger than other parts of the, the twist is much smaller than other parts, the holding force between the fiber decreased obviously. Warp in by warping machine, sizing machine, therefore, the expansion of reed, the drop needle loom, heddle, reed when parts are more prone to hairiness and pilling phenomenon, cause the weaving warp shedding is not clear. However, the speed of jet loom is high, and it is very strict to the opening and articulation of warp yarn. It is precisely the most easy to block the flight of the weft in the weaving mouth, which causes the filling to stop, which affects the efficiency of the loom and the quality of the cloth.
Since the jet loom adopts the fluid insertion method, the filling yarn is not controllable, and the initial tension and tension of the weft yarn are greatly increased, which is far higher than the normal tension of weft, especially the brake tension. For weft, on the one hand, because of using jet weft insertion of air-jet loom, in the process of weft weft untwisting, thus reduce strength, caused the weft feeder or woven mouths weft caused by bamboo parts of the weak twist off; On the other hand, due to the retraction of the elastic yarn, the twist of the slub yarn is large, and the fabric surface is easy to produce weft defect. In addition, it is easy to make the elastic yarn to be spun out of the fiber and the wick because of the effect of airflow, thus making the fabric surface similar to the "hundred feet" defect.
Main technical measures in weaving process
The zax-e air jet loom was used to make the weaving. The machine is equipped with two nozzles and the speed is set at 700r/min. The main reason is that the weft is the slub yarn, the yarn twist is too large and the jet pressure is difficult to master. When the pressure is at an hour, the weft of the weft is easy to generate and the h1-stop is caused. When the air pressure is too high, the weft will be blown off to cause H2 stop. When spraying the yarn with two nozzles, the weft of the intermittent nozzle is easy to blow off, especially the breakage of the bamboo section, which seriously affects the production efficiency and product quality. After repeated experiments, the following measures have been taken to achieve better results.
(1) To find the most suitable air pressure range by adjusting the jet pressure, once determined, it is not easy to change.
(2) Turn off the two nozzles, spray the yarn with a single nozzle, reduce the time of the filling in the main nozzle, and reduce the chance of the weft being blown off in the main nozzle.
(3) Increase the tension of the machine properly, make the warp yarn have a good opening, increase the Angle of the main nozzle and the stop yarn, and reduce the pulling force required for weft insertion.
Main processing parameters are as follows: check yarn sells 76 ° ~ 190 °, the main nozzle 86 ° ~ 170 °, and auxiliary nozzle 80 ° ~ 160 °, 100 ° ~ 180 °, 120 ° ~ 180 °, 140 ° ~ 240 °, 240 ° ~ 260 °, 180 ° ~ 260 °, computer 3 kn tension, back rest height 6 scale, menopause frame height 2.5 scale.
Through our repeated analysis and the corresponding measures, the quality of the products has been greatly improved, and the production efficiency of the loom has reached about 83%, which has achieved better results.