JPS6253616B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing a bulky yarn having a texture similar to that of a spun yarn and particularly useful for thin fabrics. With the recent changes in fashion, the demands on materials are diversifying, and many new materials are being provided to meet these demands. One of these is a so-called slub yarn for emphasizing surface changes, and its manufacturing methods range from those using a classic yarn twisting machine to those using high-speed turbulence. Examples of the latter include those that form relatively short slabs as seen in Japanese Patent Publication No. 48-30023, and those that form long slabs as seen in Japanese Patent Publication No. 48-31941. A rational method for producing slub yarn using these methods has been disclosed, and the current situation is that the current situation is being revisited to meet the current requirements for new materials by taking advantage of the characteristics of each method. Now, if we look at these conventional slub yarns, they are all manufactured using at least two yarns, a core yarn and a sheath yarn. Of course, this is due to the fact that this is in principle the most preferred method for obtaining a strong slub yarn. In other words, the aim is to provide strength and stability with the core yarn, and to selectively form slab portions with the sheath yarn. However, a drawback of this method using a core-sheath structure is that it is impossible to obtain a slub yarn with a fine fineness because two or more yarns are basically combined. Even if it could be obtained, it would have to use yarn with a finer fineness, which would lead to a disadvantage in terms of cost. Furthermore, it is necessary to use two supply roller systems, one for the core yarn and one for the sheath yarn, which also requires relatively expensive equipment. On the other hand, problems such as yarn breakage in processability during yarn processing will be doubled if two yarns are used. Favorable results can be obtained in various aspects. In particular, with the recent diversification and high-grade products, creating more delicate products using thinner threads has become a challenge for our industry, and from this perspective, we have decided to use two threads. Obtaining a slub yarn using a single yarn naturally limits the processing fineness, so it is highly desirable to obtain a slub yarn using a single yarn. In view of the current state of the art, the present inventors took on the challenge of constructing a slub yarn using a single yarn, an area that had not been attempted in the past, and arrived at the present invention. According to the present invention, when a single synthetic fiber filament thread is supplied to a high-speed turbulent fluid region for treatment at an excessive supply rate, the excess supply rate is controlled by (a) The amount of bent overhangs such as loops and curls can be controlled by intermittently changing the speed of the return movement hook or (b) supply roller under the following conditions (a') and (b'), respectively. change,
A method for producing a single filament synthetic fiber bulky uneven yarn, which is characterized by imparting thickness unevenness along its length. Condition (a') Use a fast-returning movement hook with an average number of fast-returning movements of 80 times/min or less, and keep the steady-state excess supply rate (OFc) at that time between 6% and 16%. (b') The steady-state excess supply rate (OFc) should be 8% or less, the maximum excess supply rate (OFm) should be 10 to 25%, and OFm-OFc≦10 (%) should be maintained. is provided. The present invention will be explained in detail with reference to the drawings. FIG. 1a is disclosed, for example, in Japanese Patent Publication No. 48-30023. A slub yarn manufacturing process using two yarns, 1 is a supply yarn package,
The main thread should be used as a sheath thread. On the other hand, 1' indicated by a dotted line should be used as a core yarn in this process, but is not used in the present invention. In other words, in the present invention, after feeding only one single yarn, that is, a single yarn, to the supply roller system 2,
It is sent through a fast-return movement hook 3 to a pneumatic treatment nozzle 5, passes through a delivery roller 6, and is wound up into a winding device 7. Naturally, in this case the quick-return movement hook 3 is given movement by a cam having 4 suitably patterned rotation mechanisms.
Now, if a single yarn is to be used as both the core and sheath parts as in the present invention, it is naturally necessary to select a severe and special range of conditions, and in the present invention, the steady excess supply rate of yarn 1 is 6. % to 16%, and the number of rapid return movements must be kept below an average of 80 times/minute. As shown in Fig. 2b, the yarn thus obtained clearly changes in the amount of bent overhangs such as loops and curls formed along the length of the yarn, depending on the number of quick return movements. (Note that the amount of formation can be lowered depending on how the quick return motion is set.) Furthermore, when the yarn is formed into a woven or knitted fabric, unlike when using plain filament yarn, it is possible to obtain an irregular texture on the surface of the fabric that has a natural sensation similar to that of a spun yarn. On the other hand, Fig. 1b shows the basic process for obtaining a relatively long slab as disclosed in Japanese Patent Publication No. 48-31941, but the present invention differs from this in that it uses a single supply yarn. 1′ indicated by a dotted line
The supply yarn for the core yarn is not used. What differs from FIG. 1a here is that instead of the fast-return movement hook 3, the speed of the supply roller 2 is varied according to a preprogrammed pattern to form a bent overhang such as a loop, curl, or tangle. is to change the amount of In woven or knitted fabrics formed using slab-like yarns made from a single yarn obtained using this process, irregularities on the surface of the fabric with a relatively long period and a natural sensation similar to spun yarn appear. put out In this case as well, the conditionally selected range is very narrow, with the constant excess supply rate (OFc) being in the range of 0 to 8%, and the maximum excess supply rate (OFm) being (OFm−OFc) ≦ 10%. Moreover, it is not limited to 10%≦OFmax≦25%, and it is useful to suppress the frequency of supply rate changes to 50 times/min or less. Figure 2 shows a schematic sketch of a yarn obtained by the conventional method and a yarn obtained by the present invention. The slub-like yarn 1', which should be a core yarn, selectively forms a core, and the yarn 1, which is a sheath, selectively forms a sheath (indicated by a dotted line). On the other hand, in case b, both the ground part, which should be the core part, and the slab part, which should be the sheath part, are made of the same yarn 1. As described above, according to the present invention, a bulky and mottled yarn can be obtained which gives a delicate surface effect that is different from the conventional slub yarn having a core-sheath structure. Example 1 Triangular cross-section yarn of polyester 50de/36fil was used and fed to the process shown in Figure 1a. The air pressure treatment nozzle used in this case was the one described in Japanese Patent Publication No. 47-42068, and the yarn speed was 100 m/min and the air pressure used was 4.5 kg/cm ² G. The result is below
It is as shown in the table.

[Table] Example 2 Triangular cross-section yarn of polyester 50de/36fil was used and fed to the process shown in Figure 1b. The pneumatic treatment nozzle used in this case was the one described in Japanese Patent Publication No. 47-42068, and the yarn speed was 100 m/min, and the pneumatic pressure used was 4.5 Kg/cm ² G. The results are shown in Table 2.

【table】 [Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the process of the present invention in relation to a conventional method, and FIG. 2 is a side view of a conventional slub yarn a and a bulky uneven yarn b of the present invention. 1... Sheath thread, 1'... Core thread, 2... Supply roller system, 3... Quick return movement hook, 4... Cam, 5
... Compressed air processing nozzle, 6 ... Delivery roller, 7 ... Winding device.

Claims (1)

[Claims] 1. When a single synthetic fiber filament yarn is supplied to a high-speed turbulent fluid region at an excessive supply rate for treatment, the excessive supply rate is (a) provided before the high-speed turbulent fluid processing region; (b) By changing the speed of the supply roller, bending overhangs such as loops and curls can be created by intermittently changing the speed of the supply roller under the following conditions (a′) and (b′), respectively. By changing the amount of
A method for producing a single filament synthetic fiber bulky uneven yarn, which is characterized by imparting thickness unevenness along its length. Condition (a') Use a fast-returning movement hook with an average number of fast-returning movements of 80 times/min or less, and keep the steady-state excess supply rate (OFc) at that time between 6% and 16%. (b') The steady-state excess supply rate (OFc) should be 8% or less, the maximum excess supply rate (OFm) should be 10 to 25%, and OFm-OFc≦10 (%) should be maintained.