Development And Application Status Of Water Jet Looms

< p > because the demand for synthetic silk fabrics is increasing, the water jet looms are the most suitable for producing synthetic silk fabrics, and the high profit of synthetic silk fabrics can enable input to get a return in a relatively short period of time. Therefore, not only the introduction of hot water in the silk weaving industry continues to heat up, but also cotton textile, such as its "a target=" _blank "href=" http://www.91se91.com/ "> textile" /a "industry, and the introduction of water jet looms. At the same time, domestic waterjet looms are also getting better, not only with foreign investment, but also by state-run and private investment, with the introduction of technology and imitation.

According to statistics, in 1999, there were 696213 Cotton Looms in the cotton textile industry, of which 58687 were shuttleless looms, accounting for 8.43%, while loom looms accounted for 13.36% of shuttleless looms, and there were 196943 looms in silk weaving industry, of which 30410 were shuttleless looms, accounting for 15.44%, while water looms accounted for 79.82% of shuttleless looms.

The weaving technology of water jet looms brings better economic performance, and its special adaptability to weaving synthetic fibers makes it stand out in the modern shuttleless looms and shows its vigorous vitality.

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< p > 1, spray water < a href= "http://www.91se91.com/news/" > weaving < /a > Technical < /p >

< p > 1.1 the characteristics of weft insertion by water jet weaving: < /p >

One is shuttle loom weft insertion and weft holding. The weft insertion mode is less affected by material variety, status (and number of twists) and shape of the shed. The second is the rapier loom and shuttle loom in shuttleless loom. The weft insertion is done by the rapier head and the shuttle shuttle, and the weft is semi gripping. The weft insertion mode is less influenced by the material variety, the state and the shape of the shed. The three is air-jet loom and water jet loom, and the weft flying is self generated by the air current beam and the water flow weft. The weft insertion mode is influenced by the raw material variety, the state and the shape of the shed. < p > there are mainly three kinds of weft insertion methods for looms.

The biggest difference between shuttleless loom and shuttle loom is weft insertion, and the characteristics of weft insertion in water jet weaving are mainly two points.

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< p > (1) free weft insertion < /p >.

< p > if the raw material is a multifilament filament, when the single side weft thread is cut off, the head will be fluffy, so it is difficult to lead from the side of the shed to the other side; if the weft yarn is twisted strongly, the silk thread will rotate and difficult to smoothly weft with the twisting and pulling force of the silk thread; and if the shed is not clear, especially when there is wool in the shed, the warp and wool will bump into the weft thread to form a weft.

Therefore, the weft yarn used for water jet weaving is preferably thermoplastic. When the weft wire is cut off by a high temperature electric knife, the head will form a burning point to prevent the loose ends of the multi fiber ends from being difficult to weft. The high twist silk thread is better in shape, the torque is applied, the silk thread is not rotated, and the clear shuttle opening is adopted, so as to prevent wool and sundries in the shed.

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< p > (2) flow weft insertion < /p >.

< p > the water jet loom completes the weft insertion by means of the flow beam. The bundling of the flow beam is superior to that of the airflow. Therefore, the pport property of the water jet loom is better than that of the air flow bundle, and the weft insertion condition of the water loom for the long fiber is better than that of the air-jet loom.

However, the water bundles make the warp and fabric moist near the shed, and only hydrophobic fibers can adapt.

The standard regain of polyester is 0.4%, and the standard moisture regain of nylon is 4%. They are truly hydrophobic fibers. As warp threads and sizing, not only can they finish weaving, but also because of wetting warps, the static electricity of silk threads is relieved due to repeated friction of heald wires and reeds.

However, it is difficult to weave silk with standard moisture regain of 14% instead of viscose filament of non thermoplastic fiber and standard moisture regain of 11% and sericin.

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< p > 1.2 the flight condition of weft yarn of water jet loom < /p >

Observing the flying conditions of weft threads at different flight stages during waterjet weaving, it is found that when the jet polyester is low elastic yarn, due to the fluffy fiber and good riding capacity, the weft flying is in good condition, but the top flight is unstable and easy to bend, resulting in the loom shutting off and not being the first grade. When the jet polyester filament is tightly twisted, the fibers are twisted tightly, the silk body is hard, the water content is decreased, and the torque is affected. The weft flying is unsteady and the curving floated state. When the ordinary polyester filament is sprayed, due to the moderate water content of the fiber, the head end is sintered with good agglomeration and soft silk, and the flight condition is good. < p > synchronous flash instrument.

Therefore, in daily production, the ordinary polyester filament is used as weft yarn for water jet weaving, with the best effect and smooth weaving.

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The economy < /p > < p > 2 water spray weaving

The technical and economical comparison of shuttleless looms and multiphase looms is shown in Table 1. < p >

From table 1, we can see that apart from the multiphase looms, the loom has shown its superiority in the speed and efficiency of the average weft insertion.

According to the analysis, if the ZW-100 fabric loom needs 100 units, the shuttleless loom type Ruti-c needs 300 units, the rapier loom R-100F type needs 250 units, and the shuttle loom type PU needs 130 sets.

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A comparative score of the new loom performance published by the Research Committee of Japanese fiber < a href= "http://www.91se91.com" > Machinery > /a > P shows that if the score is 10 points, the total score of water loom is 7.71 points, which is the highest among all looms.

But from the perspective of the adaptability of small batch and multi varieties, the limitation is larger, and the fraction is far lower than that of rapier loom and projectile loom, but it is slightly better than air-jet loom.

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< p > 3 technical status of water jet weaving < /p >

< p > the rapid growth of the demand for synthetic fiber fabrics not only provides rapid development space for water jet looms, but also constantly renewing the variety of fiber materials and fabrics, and people constantly put forward new requirements for weaving technical efficiency, and gradually improve the technology of water jet looms and water jet weaving. After more than 10 years of development, the technical level of waterjet weaving has taken on a new look.

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< p > 3.1 vehicle speed increased < /p >

The speed of < p > conventional and mass production has increased from 500r/min in the past to more than 700r/min. The speed of production of some models can reach 900r/min, and the speed of experiment and exhibition reaches 1000~120r/min.

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< p > 3.2 breeds breakthrough > /p >

< p > water jet looms were mainly made of nylon spinning and polyester flat spinning in 80s. With the rapid development of synthetic silk processing technology, the limitations of varieties have been greatly breakthroughs, mainly in the following aspects.

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< p > (1) the use of dobby looms and double spray and free color selection make the products colorful.

In the past, water jet weaving was mainly based on single jet single weft and plain tread opening. Due to the breakthrough of high speed technology of dobby and the wide application of high speed water jet looms, and the research and popularization of double jet and free color selection technology, the current water jet looms have been able to weave twill, satin and Sanyuan organization, stripes, lattice fabrics and small pattern fabrics, and the fabric varieties are ever-changing.

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< p > (2) from the weaving of single conventional fibers to the development of differential fibers, to the development of simulated silk and wool like fabrics.

In the past, 76dtex, 68D (78dtex), 78dtex (70D), 111dtex (100D), 167dtex (150D) and other conventional polyester and nylon silk were mainly used. At present, they can not only knit regular yarn, but also knit low elastic yarn, strong twist yarn, special shaped wire and different shrinkage yarn. They can not only knit ordinary silk, but also weave fine denier and split type superfine yarn.

Raw materials are the foundation of variety development, and the improvement of raw material adaptability has made a great breakthrough in the range of water jet weaving.

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< p > (3) from weaving of thin fabric to weaving development of thick and heavy < a href= "http://www.91se91.com/news/index_c.asp" > fabric < /a >.

Silk filament fabrics are mainly light and thin products. Due to the influence of the trend of "thin fabric to thin development" and the development of thin fabric to a wider field, especially for the development of wool like products, the water jet looms are also developing from light looms to heavy looms. The reinforcement of the frame and the improvement of the beating up mechanism make the weaving of heavy and heavy fabrics on the water jet looms very smooth. Therefore, wool like products, heavy weight synthetic silk fabrics and twisted twisted imitation thick heavy silk fabrics can be woven on the water jet looms.

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< p > (4) loom can widen the width of the door.

In the past, the width of the fabric woven by water jet looms was generally 100cm. After the improvement of the weft insertion nozzle, the weaving width has now reached 160~180cm, which is adapted to the requirements of the contemporary "a" target= "_blank" href= "http://www.91se91.com/" > clothing < /a > cutting technology.

Due to the problems of weaving, tissue, weight and width of fabrics, the weave knitted fabrics made of water jet looms are rich and colorful, which can meet the needs of consumers at all levels, and create better conditions for competition with shuttle looms. However, there is no substantial breakage in jacquard weaving.

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< p > 3.3 preparation equipment further optimized matching < /p >

< p > the preparation process of shuttleless weaving is short, which creates conditions for the improvement of product quality and the efficiency of loom, and the further optimization and matching of the equipment will make the loom more superior.

It is mainly the improvement of warping and sizing technology. In the past, it was generally divided into two parts, namely, shaft sizing, thread cutting and shaft joining.

Because the warp threads are relatively thin and can prevent the paste from sticking together, the quality of the silk thread can basically meet the requirements. Both the quality of the warp shaft and the improvement of production efficiency are better than the original one by one method.

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< p > with the further development of production and the further improvement of product quality requirements, the three step method of sub axis warping, split shaft grouting and parallel shaft has been put into production, and has become the main production process and equipment of the whole pulp. It can not only provide the warp shaft which can produce smoothly, but also reduce the stopping time when the pulp passes through, prevent the formation of fabric cross gear due to the shrinkage of the long hot baking wire, and check the quality of the silk thread on the warp shaft during the sizing process. Although a production process has been added, it has brought unprecedented benefits to the improvement of product quality and production efficiency.

Later, the preparatory processing method was to combine the finishing process of the synthetic fiber spinning process and the warping and sizing process before weaving, breaking the traditional way of intermittent discontinuous processing. The synthetic fiber POY wire (preoriented wire) was directly put on the cheese rack, and continuous warping and thread drawing were carried out. Then the network and sizing were processed into a warp shaft one step. It can effectively guarantee the uniformity of the tension of the monofilaments, thereby providing the superior quality of the slurry shaft. However, the equipment occupies a large area, and the investment is large, and the popularization of the large area is restricted.

The stable production of twister has provided a uniform silk thread for water jet weaving. It is also an important aspect of further optimization of water jet weaving preparation equipment, so that the quality of crepe products produced by water jet looms is very good for consumers and becomes a favorite pants for consumers.

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< p > 3.4 computer management creates the conditions for scientific management of water jet weaving. < /p >

After P, 90s, the "centralized computer management system for Loom factory" was adopted internationally, that is, LAN system. It can not only reflect the speed, output, efficiency, stopping time of looms, but also reflect the data of workshop, team, class, day and month, which has created favorable conditions for scientific management.

Later, the field monitoring system, namely CRT system, was widely used to achieve man-machine conversation, creating conditions for the unmanned workshop of water jet looms.

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