Section color yarn spinning technology analysis Shi Jingjing Yang Enlong Chen Weixiong Xue Yuanyi Hong Lei (Zhejiang Jiaxing College) France and other line density section yarn into yarn technology, and with the current several paragraphs of color yarn production methods were compared and analyzed. It is believed that the new technology adopts a three-axis four-roller color spinning device to achieve simultaneous control of the main yarn and the auxiliary yarn at the same point, which can be adapted to fibers of various lengths, improve the production of sliver, and reduce defects; The adjustment can meet various design requirements; the ratio of the main and auxiliary yarn blends can be changed in any ratio, the control is quick and easy, the quality of the segmented yarn can be improved, and the color effect of the segmented yarn fabric can be enriched.
In recent years, fancy yarns and fabrics have become more popular. The production of fancy yarns on cotton spinning equipment is a hot topic in the development of new textile products. Segmented colored yarn is a kind of special spinning technology for colored fiber spinning. Its yarn color is not only combined in the same cross-section of the yarn by a variety of colored fibers, but also in the longitudinal length of the yarn, different combinations of colored fibers are not The pattern of intermittently changing distributions, so fabrics made from segmented colored yarns, are soft and plump in color and have a strong sense of layering. They are obviously novel and unique.
1 Current Status of Domestic and Foreign Coloured Yarn Technologies From the point of view of domestic and foreign materials and the equipment displayed, the segmented colour yarn technology mainly uses the needle comb combing process to perform segment colour matching. In the multi-fund project: Zhejiang Province key scientific and technological innovation team independent project (2012R10012-4) colored parallel bar-feeding machine to feed colored or colorless fiber bar, from the side of the fuselage to the four feeding position, with The computer program controller controls the color matching roller speeds of the four stepper motors in a segmented manner to achieve segmented color matching, and a segment color stripe is formed and then the segmented color yarn is spun. The process can realize multi-color segment color matching in the same process. However, this process has certain requirements on the fiber length and fiber type, and is suitable for the needle combing and drawing processing method. After the wool fiber strips are drawn by the subsequent processes, the color segments have a long length and the products have greater limitations; the decorative yarn color stripe is Feeding at four different points in the longitudinal direction of the base strip, it is difficult to achieve the head-to-tail connection of any color point at each point, and it is difficult to make and change the process; such equipment is expensive, and there are not many domestic manufacturers currently introduced. At present, there are mainly the following three methods for producing segment yarns in China.
1.1 Draw frame feeding method Draw frame feeding method is mainly applied to wool spinning. Imitation of foreign equipment in the drawing process using computer programs to control the frequency conversion or servo motor, multi-position on the colored fiber strips are fed into the paragraph to form a paragraph color tops. This method is applicable to wool fibers with longer fiber lengths. The draw frame is a needle and card draw frame. After the products are processed by the subsequent processes, the length of the segment color is longer.
1.2 Spinning Machine Three Roller Drawing Method See the three-roller drawing method of the spinning frame.
In the spinning process, a simple modification is made to the drafting mechanism of the three rollers of the spinning machine. The main core yarn A is fed from the middle roller, the auxiliary yarn B is fed from the rear roller, and the auxiliary yarn is controlled by the electric or mechanical device to feed intermittently. , The main core yarn A and the auxiliary yarn B gather at the middle roller clamp to achieve the segment color effect. This method is currently used in many countries. Its yarn forming structure is: wrapping the auxiliary yarn on the main core yarn. This type of spinning machine is currently used mostly for the production of segmented slub yarn.
1.3 Spinning Machine Four Roller Drawing Method See the four-roller drafting method for the spinning machine.
On the basis of the three rollers, a back roller, three rollers and four rollers are equipped with ladder rollers to hold the two rovings fed in. The main core yarn is fed from the four rollers and the auxiliary roller is fed from the three rollers. Roller feeding, the roving strand A is controlled by the step rubber roller 5, passes above the small diameter end of the step rubber roller 5, and the roving sliver B passes above the small diameter end of the step rubber roller 5 and is received by the step rubber roller. 5 control, the program controller controls the servo motor, so that the three rollers and the four rollers are driven by a variable speed, assembled within a main draft formed by a roller and a second roller to realize the effect of the segmented color yarn; the principle of segment color control and spinning The effect is similar to that of the three-roller drafting method. The difference is that the speeds of the three rollers and the four rollers are adjustable. The main yarn increases the draft control in the rear zone. The yarn formation is relatively good, but its three rollers and four rollers Roller's holding point of roving is different from that of the second roller, especially the larger gap between the two roller and the fourth roller. It is not suitable for the spinning of the cotton fiber strip. At the same time, the three rollers and the fourth roller are used for the roving. The holding point is not at the same point where the length of the roving is fed, Step point control speed and the same site, affect yarn evenness, the adjustment process is complicated.
Although the four-roller method can spin the yarns with relatively uniform section color, the blending ratio of the main and auxiliary yarns is not easy to adjust and control due to the limitation of the main and auxiliary roving weights and the draft multiple of the rear area.
2 isometric density segment yarn spinning technology, etc. The linear density yarn spinning technology is aimed at many problems in the current stage of color yarn production technology, research and development of a new type of color yarn spinning method. The spinning method is realized by a three-axis four-roller drafting method, which not only realizes different color combinations in yarn cross-section and length direction, but also maintains the evenness of the yarn. See the specific structure, where A is a roving A, B is roving B.
The mechanism was transformed from a traditional spinning frame drafting mechanism. Afterwards, the roller is designed as a coaxial double roller structure, that is, in the structure design of the back roller, the rear roller is fixed on the rear roller shaft and is installed with a fixed back roller and a looper installed behind the looper, corresponding to each chain position, and the back roller is fixed. Paired with looper rear roller, the effective width occupies one half of the original, the two rear rollers have the same working outer diameter, and the corresponding rear roller is also designed to be installed on two rollers that can rotate respectively on the same roller shaft. Roller. A looper roller drive shaft is added behind the back roller shaft and is equipped with a toothed belt pulley, and the back roller is driven through the toothed belt. The servo motor controlled by the program controller drives the double rollers to rotate respectively, and its rotation speed can be set at different time periods. The drafting mechanism is characterized in that the pitches of the main and auxiliary yarns in the rear drafting zone are the same; the double rear rollers are installed on the same shaft, and the nip formed by the rubber roller is located on the same axis, and the roller can realize synchronized and co-shifting control on the fiber strips.
When spinning, the special linear density is T and A. The two types of rovings, A and B, are fed into the back roller by the guide bar and the sub-grid, and are controlled by a fixed back roller and a back cover roller respectively. The two draft rovings have the same spacing in the rear draft zone. After the double roller speed setting, adopts the speed-coupled equal feed control method, so that the rovings of the two groups A and B can be fed at any time, and the rovings of the two groups can be fed at any time. The sum of the amount is fed into the rear draft zone and is fed into the center roller at different draw ratios after being bundled by the buncher, and is merged in the front draft zone of the spinning frame and output by the draft of the front roller. Twisted into other yarns with a linear density.
During normal spinning, in the ith process section, the feeding amounts of the rovings of the two groups A and B are controlled by the line speeds vSl and V of the fixed roller and lap roller on the back roller respectively, and the unit time is controlled. The feeding amount of the inner rear roller is (T A Vs + T B x T. The fed roving whiskers are fed into the middle roller clamp via the collector, merged in the apron drafting area, and output by the front roller and the roving. The sliver is twisted into a section of color yarn.In the transmission and control of the mechanism, the fixed roller and the lap roller are respectively driven by the back roller shaft and the lap roller transmission shaft, and the rotation speed is controlled by a computer program controller, which can The extension zone parameters are set in time segments, and the V-solid and V-live speeds in each time zone are controlled. For rovings with the same number of special-numbered rovings, the V-grid+V live is controlled. V = 1 + V + 1 + 1 is a constant, which guarantees that the feeding amount of the roving bar in the middle roller clamp is not changed; and the special number of the roving bar with different special numbers in the two groups is T. A and T B, A rovings are fed from a fixed back roller, and B rovings are fed from a looper roller, as long as the increment of V line speed is controlled to V line speed. The amount of T-A/T-B times, or the increase of V-Solid w-line speed is the decrement of V-live i-line speed by T/T, which ensures the feeding of the roving bar in the middle roller clamp. The amount is not changed; for each time period ti setting, the length of the segment color can be controlled; by setting various different ratio combinations for the V solid/V live i, different fiber and color combination effects can be achieved.
Based on the analysis of the above control principles, it can be seen that the method of equal-strength-segment color-spinning yarns has obvious technical advantages compared with the currently-used segment-spinning yarn methods. As the mechanism achieves simultaneous control of the main yarn and the auxiliary yarn at the same point, Adapt to various lengths of fiber, into a sliver to improve, reduce defects; paragraph color length adjustment to meet a variety of design requirements; main and auxiliary yarn blend ratio can be changed at any ratio, control is quick and easy. This spinning method improves the quality of the segmented yarns and enriches the color effect on the surface of the segmented yarns.
3 Conclusion The draw frame segment spinning method is mainly applied to the wool yarn, section color long; the spinning machine three roller draw yarn production is currently used more; spinning four-roller drafting production The yarn color of the segment is relatively uniform, but adjustment and control are inconvenient. The three-axis four-roller color spinning device using coaxial speed-coupling control can easily achieve the constant feeding amount of the two fiber strips, thus achieving equal linear density spinning. It is easy to achieve different color combinations of yarn cross-section and length direction, and it can also maintain the evenness of the yarn. The spinning technology overcomes the defects of the existing section color yarn spinning structure, realizes the simultaneous control of the main yarn and the auxiliary yarn at the same point, and is suitable for the spinning of various fibers, and can be used for various types of roller stretching spinning mechanism spinning The technical transformation of the section color yarn. This section of color yarn method is applied to the color spinning process, and can better meet the process design requirements of the segment color spinning yarn, to further enhance the quality of the segmented color yarn, and to enrich the color effect of the segmented color yarn fabric.
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