JPS6236953B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a tapered package of false twisted yarn suitable for high-speed unwinding. In recent years, technological innovations in the weaving process have progressed, and innovative looms such as water jet looms (WJL) and air jet looms (AJL) have become widely used. , used under sequential high-speed conditions, some of which are 1000m/
Cases are emerging where the speed is faster than a minute or more. By the way, as the unwinding speed increases, the number of unraveled yarn breaks generally increases, but this tendency is remarkable in the case of false twisted yarn, and under the above-mentioned high speed conditions, the yarn breakage increases dramatically. It becomes unusable due to increased wear and tear. Against this background, various proposals have been made for the purpose of improving the unwinding properties of false-twisted yarns. Improvements have been made in terms of properties, such as adding an oil agent or imparting entangling properties, or a combination thereof has been used. Among these, improvement by imparting entangling properties to processed yarn (specifically, imparting entangling properties by air entangling treatment) is a very effective method, but on the other hand, it causes irritable defects on the surface of the final fabric. Therefore, it has the disadvantage that it can only be used for limited purposes. Therefore,
For mainstream applications, it is necessary to optimize the combination of various items related to winding conditions. However, as weaving speeds continue to increase, higher levels of weaving efficiency and product quality are required than ever before, and the combination of winding conditions in the prior art cannot meet these demands. The present invention aims to solve the problem that it has become impossible to maintain a satisfactory level with the combination of conventional techniques in response to the increase in yarn breakage due to the increase in unwinding speed, and in particular, to solve the problem of the problem of yarn breakage with increasing unwinding speed. This tendency is remarkable, and there is a significant drop in weaving efficiency,
The purpose is to eliminate the problem of deterioration in product quality. That is, the purpose of the present invention is to provide a new tapered package of false-twisted yarn that has fewer yarn breakages even if the unwinding speed is increased, thereby increasing weaving efficiency and improving product quality. It is something to do. The present inventors have worked hard to develop a tapered package for false twisted yarn that satisfies the above objectives, and have achieved the above by creating a package in which variation in winding density by layer, which is an essential defect of tapered packages, is properly controlled. The inventors have found that the object is satisfied and have come up with the present invention. The configuration of the present invention that achieves the above object has an initial winding width (Lo) of 200 mm or more, a helix angle (Θ _p ) at the beginning of winding,
_{False -} twisted yarn whose winding ^angle ( _Θ It is a tapered package. Hereinafter, the present invention will be explained in more detail using the drawings. FIG. 1 is a side view showing an example of a tapered-wound, false-twisted yarn package. FIG. 2 is a graph showing the winding density in each winding layer of the tapered false twisted yarn package. FIGS. 4A and 4B are graphs showing examples of the number of traverses and changes in winding angle in the package forming process, respectively. FIG. 3 is a schematic diagram showing an example of a winding mechanism for false twisted yarn. In these figures, 1 is a paper tube, 2 is a yarn layer,
3 is a traverse box, 4 is a traverse chip, 5 is a friction dry roll, and 6 is a false twisted yarn. Also, in Figures 2 and 4, A
and B show the situation according to the prior art, and C shows the situation according to the method of the invention. False-twisted yarn is usually wound into a cheese shape with a square end or a tapered end. However, in the case of a square end, the cheese end face swells, making it difficult to obtain a well-shaped package and resulting in poor unwinding properties. It becomes bad. Therefore, tapered end cheese as shown in FIG. 1 is preferably used because it provides a good package form. By the way, the winding density distribution of a conventional tapered package is as shown in FIG. 2A. On the other hand, if the prior art simply increases the winding hardness in order to improve the unwinding property, the winding density distribution will be as shown in FIG. 2B. In the package B, the winding density at the beginning of the winding was too high, which changed the crimp characteristics of the false twisted yarn, and the ears at both ends of the package were damaged during winding, resulting in dyeing spots. Not only is the product inferior in terms of quality, but also the winding density of the outer layer of the package is not properly increased, so the unwinding performance of this part is not as improved as expected. Even worse, in package B, the difference in winding density between the inner and outer layers of the package increases,
This results in a large difference in crimp characteristics between the inner and outer layers, resulting in a decline in the quality of the final product. The tapered package of false twisted yarn according to the present invention eliminates all of the above-mentioned drawbacks, and an example thereof is shown in FIG. 2C. The winding density distribution of the package is properly controlled. This package with a controlled winding density distribution is made with a winding angle (Θ
_x ) can be obtained by forming a package while maintaining the relationship tanΘ _p /Lo<tanΘ _x /Lx. A package with a winding angle configuration that satisfies the above formula so that the winding density distribution is controlled during the package formation process is obtained by increasing the number of traverses during the package formation process to a higher number than the number of traverses at the beginning of winding. Obtained by sequential control method. This relationship will be explained in more detail. FIGS. 4A and 4B are graphs showing changes in the number of traverses and the winding angle during the package forming process. In the conventional technology, the number of traverses is always constant due to the constraints of the operating system of the false twisting machine, and therefore the helix angle in the package forming process always maintains the relationship tanΘ _p /Lo = tanΘ _x /Lx. It is something that is uniquely determined. Therefore, only packages with winding density distributions as shown in FIGS. 2A and 2B can be obtained. In the present invention, as shown in FIG. 4C, at the winding width Lx in the package forming process, in order to obtain the desired winding density, the winding angle Θ _x satisfies tanΘ _p /Lo<tanΘ _x /Lx. The number of traverses Tr.x is controlled so that the package is formed. In the package of the present invention, the difference in winding density between the inner and outer layers is preferably 0.3 g/cm ³ or less, and 0.25 g/cm 3 or less.
It is more preferable that it is less than g/cm ³ . In addition, the winding angle Θ is suitably in the range of 10° to 15° regardless of the winding width L, and on the other hand, it is preferable that the difference between the winding start angle and the winding end angle be within 3°. More preferably, the angle is within 2°. FIG. 3 shows an example of a winding mechanism for false twisted yarn, in which the package is pressed against a friction drive roll 5 and rotated. The false twisted yarn 6 forms the package 2 while being given reciprocating motion by the traverse chip 4. In the package of the present invention, the number of revolutions of the drive motor _M1 , which determines the number of traverses, is controlled during the package forming process. This is achieved by controlling the output rotation so that at each point in time the output rotation is at a higher level than at the beginning of winding. Furthermore, as is clear from the above description, in order to efficiently produce the package of the present invention, it is preferable to use a novel operating system in which multiple spindles of the false twister are operated and stopped simultaneously. A satisfactory package cannot be obtained simply by controlling the helix angle in the package forming process as described above, but the package must have a heel angle controlled as described above and a winding density of 0.50 g/cm ³ or more. . If the winding density is less than 0.50 g/cm ³ , good unwinding properties will not be exhibited and only a product with low weaving efficiency will be obtained. In addition, when the initial winding width is less than 200 mm, excellent high-speed unwinding performance can be obtained using only the conventional technology, but for long packages with an initial winding width Lo of 200 mm or more, the unwinding performance is noticeably inferior. Therefore, the package of the present invention is required. As mentioned above, in the present invention, the winding angle in the package forming process is appropriately controlled, and as a result, the winding density in each winding layer of the package is in a desired state.
Furthermore, since the overall winding density is properly wound, it is possible to obtain a material that can sufficiently follow the dramatic increase in weaving speed. Furthermore, since the package of the present invention has a small difference in winding density between the inner and outer layers of the package, a product with a small difference in crimp characteristics between the inner and outer layers can be obtained, and the quality of the final woven or knitted product is improved. Furthermore, since the package of the present invention has a more uniform winding density distribution than the conventional one, the overall volume of the package is smaller than that of the conventional one, and it has the unexpected effect of being able to be made into a large package. The present invention usually involves false twisting, simultaneous stretching false twisting, and continuous stretching.

【table】

[Table] The number of traverses for No. 3 and No. 4 levels is
This was changed during the package formation process,
The detailed conditions are as shown in FIG. In these cases, the relationship tanΘ _p /Lo<tanΘ _x /Lx is maintained. In addition, in the production of No. 3 and No. 4 level package cages,
A production system was adopted in which 48 spindles were started and stopped at the same time, and the unsteady part of the false twisted yarn was wound on a waste yarn winding device installed at each spindle. Example 2 By a simultaneous stretching and false twisting method using a false twisting machine,
A 100 denier 48 filament one heater type polyester false twisted yarn was obtained. When winding the obtained false twisted yarn into a tapered cheese shape, it was wound at four levels as shown in Table 2. Each package was unwound at a speed of 1000 m/min and yarn breakage was compared. Table 2 shows the hoisting conditions, package characteristics and unwinding characteristics.
Shown below. Level No. 8, which is the package of the present invention
It is possible to make a large package without increasing the package size, and the package has a 5 kg roll. This package, ranked No. 8, exhibits excellent high-speed unwinding properties.

【table】

[Table] Levels No. 6, No. 7, and No. 8 are those in which the helix angle is controlled so that tanΘ _p /Lo < tanΘ _x /Lx is maintained during the package formation process. The angle control method was to control the number of traverses. Level No.8
The detailed traverse conditions are shown in FIG. In addition, when obtaining these packages, a drawing false twisting machine equipped with a waste yarn winding device was used, and a production system in which gold spindles were started and stopped all at once was used. Example 3 A polyester drawn yarn of 150 denier 48 filaments was subjected to false twisting to obtain a two-heater type false twisted yarn of 150 denier 48 filaments. When winding the obtained false twisted yarn into a tapered cheese shape, it was wound at three levels as shown in Table 3, the resulting package was unwound at 1200 m/min, and yarn breakage was compared. In addition, the crimp characteristics of the yarns in the innermost layer and the yarns in the outermost layer of the obtained package were measured using CCT values. Furthermore, knitted fabrics were made using a circular knitting machine using each level of package cage, and the incidence of weft rows in the final product after dyeing was compared. Table 3 summarizes the winding conditions, package characteristics, unwinding properties, crimp characteristics of the inner and outer layers, and the incidence of weft layers in the final product. The package of level No. 11, which is the package of the present invention, showed good results in terms of high-speed unwinding property, difference in crimp characteristics between inner and outer layers, and rate of occurrence of weft steps.

[Table] The level of No. 11 is tanθ _p /
The winding angle was controlled so that Lo<tanθ _x /Lx was maintained, and the winding angle was controlled by controlling the number of traverses. The detailed traverse conditions are as shown in FIG. Note that this is a typical crimp characteristic of false twisted yarn.
The method for determining the CCT value is as follows. CCT value measurement method Model: Continuos-Crimp Tester R-2080
(Manufactured by ROTHSCHILD) Measurement conditions: Measurement temperature: 150°C Measurement speed: 16.5 m/min Overfeet rate: 6% Measurement time: 3 minutes Example 4 The yarn has dark and light dyed areas in the longitudinal direction due to the stretching and continuous false twisting process. A false twisted yarn of 150 denier 48 filament was obtained. When winding the processed yarn into a tapered cheese shape, it was wound under the conditions shown in Table 4. When the obtained package was used as a weft yarn in a warder jet loom at an unwinding speed of 850 m/min, the unraveling yarn breakage was 0.02 times/10 kg, which was a very good result.

【table】 [Brief explanation of the drawing]

FIG. 1 is a side view showing a tapered package of false twisted yarn. FIG. 2 is a graph showing the winding density distribution of a tapered package. FIG. 4 is a graph showing the number of traverses and winding angle in the package forming process. FIG. 3 is a schematic diagram showing an example of a winding mechanism for false twisted yarn. FIGS. 5 and 6 are graphs showing the number of traverses in the example. 1: paper tube, 2: yarn layer, 3: traverse box, 4: traverse tip, 5: friction drive roller, 6: false twisted yarn.

Claims (1)

[Claims] 1. The initial winding width (Lo) is 200 mm or more, and the winding angle (θ _p ) at the beginning of winding and the winding width Lx in the package forming process
A taper-wound package of false twisted yarn, characterized in that the helix angle (θ _x ) satisfies the following formula and the winding density is 0.5 g/cm ³ or more. tanθ _p /Lo<tanθ _x /Lx