JPS6249376B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a novel textured yarn that has stretchability added to a spunlike false twisted textured yarn. More specifically, the present invention relates to a yarn with a two-layer structure in which wrapped yarns are alternately twisted around a core yarn. Regarding improvements. Conventionally, alternately twisted two-layer structured yarns using false twisting have been manufactured by the method described below. In other words, when two or more types of yarns with different elongations are fed to the supply roller in a aligned state and twisted by a false twisting spindle, the yarns with lower elongations are difficult to stretch, so they form the core of the yarn. However, since yarns with high elongation are easy to stretch, they are twisted so as to surround the outer layer of the yarn. When this twisted yarn state is heat-set and then untwisted, a two-layered crimped yarn is obtained in which the threads with low elongation become the core yarn, and the threads with high elongation surround it in an alternating twisted form. It will be done. (Unexamined Japanese Patent Publication No. 49-72443
On the other hand, as another method for producing a double-layered yarn having the above-mentioned configuration, the core yarn is twisted (false-twisted) by a false-twisting spindle. It is also well known to overfeed the winding yarn using the rotational torque of the yarn. (For example, see Japanese Patent Publication No. 45-28018.) In the double-layered yarn obtained by these methods, the twisted yarn is generally wound around the core yarn in an alternately twisted manner, so the twisted yarn structure According to
It has the advantage of improving the slimy and fluffy feel that is a disadvantage of ordinary woolly processed yarn fabrics, but on the other hand, since the wound yarn is wound in a tight bundle, it does not cause crimping of the core yarn. It had the disadvantage that it could not express the elasticity of woolly yarn and lacked the elasticity of ordinary woolly processed yarn. The purpose of the present invention is to improve the drawback of poor stretchability of the conventional alternately twisted two-layer structured yarn as described above, and to provide a two-layered spunlike textured yarn with elasticity (stretchability). . As a result of various studies to achieve the above object, the present inventors found that since the core yarn is bundled by the wrapped yarn, the crimp force of the conventional core yarn overcomes the binding force and causes crimp. I confirmed that it is not possible. Therefore, we assumed that if we use a core yarn that has a greater crimp force than the previous ones, the core yarn would also develop crimp, and as a result, stretchability would occur due to crimp, and we will investigate this further. In the process, we learned that a side-by-side composite yarn of polybutylene terephthalate and polyethylene terephthalate was useful as a core yarn with such characteristics. That is, the present invention is a false twisted crimped yarn made of two types of filament yarns, one of which is a core yarn, around which the other filament yarn is wound, and a part of the filament constituting the wound yarn. is randomly mixed and intertwined with the filaments of the core, and the crimped yarn as a whole is wound around the core yarn in an alternating manner. This is a stretch spun-like processed yarn characterized by being composed of a side-by-side type composite yarn of merging and polyethylene terephthalate polymer. The present invention will be explained in detail below. As already mentioned, in the production process of conventional two-layer spunlike textured yarn, the other yarn under low tension wraps around the core yarn under high tension during false twisting, resulting in a wound yarn. Since the yarn is covered in a tightly bundled state, even after false twisting, conventional core yarns with a small crimp force will not develop crimp, and therefore stretchability due to crimp cannot be expected. Therefore, even though this kind of processed yarn has a good spun-like texture,
When made into a woven fabric, it has poor stretchability, and when used for clothing, it causes a feeling of pressure at the elbows and knees. Especially in sports clothing, this improvement is strongly desired. In order to compensate for the drawbacks of this two-layer structure yarn, conventional yarns have been used in which they are interwoven with stretchy woolly processed yarns, or with so-called covering yarns that cover spandex. There are problems such as the spun-like texture of the fabric is reduced by half, and the price is high and it takes time and effort. In this regard, according to the studies of the present inventors, in order to solve this problem, even when the core yarn is bundled by the wound yarn of the double-layered wound yarn, crimp of the core yarn does not occur. It became clear that the force must overcome the tightening force of the wound yarn to cause crimp. Using a side-by-side composite lamination of polybutylene terephthalate polymer and polyethylene terephthalate polymer, which has a high crimp-generating force, is used for the core yarn, and a remarkable stretching effect can be obtained, and a spun-like style can be obtained. It has been found that this does not impair the quality of the product. The intrinsic viscosity [η] of the polybutylene terephthalate polymer of the composite yarn used for this core yarn is preferably 0.65 or more and 0.9 or less, while the [η] of the polyethylene terephthalate polymer
is preferably 0.35 or more and 0.5 or less. and,
The larger the difference [η] between these two, the better the desired stretchability. Moreover, the combined ratio of the two is preferably 3/7 to 7/3. Furthermore, as a composite method, the side-by-side type has better stretchability, but even the eccentric sheathed core type has a certain degree of stretching performance. Hereinafter, an example of obtaining a spunlike textured yarn of the present invention using the above-mentioned composite yarn will be explained with reference to the drawings. In FIG. 1, the above-mentioned composite yarn (filament yarn) 1 and polyethylene terephthalate filament yarn 2 having a higher elongation are combined in a guide 3 and then passed through a tension adjustment device 4 and a feed roller 5 to be mixed and entangled. The yarn is supplied to an air injection nozzle 6 for use in the air injection nozzle 6, where it is turned into an interlaced yarn having at least 30 interlacing points/m. Next, this intertwined yarn is supplied to the drawing false twisting zone by the first delivery roller 7, passes through the heater 8 and the false twisting tool 9, and then is delivered to the second delivery roller 1.
0 and then wound up as cheese 11. The processed yarn thus obtained has the form of a two-layer yarn structure in which the composite yarn is arranged as the core yarn 12 and the polyethylene terephthalate yarn is arranged as the wrapped yarn 13, as shown in FIG. What is important here is that due to the expansion and contraction of the core yarn of the processed yarn, as well as repetition, the core yarn and the alternately twisted winding yarn may separate, which may cause practical problems. It is necessary to add entanglement to stabilize the thread structure. The interlacing treatment may be applied before or after the false twisting process, but it is generally preferable to apply it before the false twisting process because a more stable structure can be obtained. . The more entanglements imparted to the raw yarn, the better. Generally, when an entanglement treatment is performed, the entangled portion and the spread portion become a repeating unit to form an entangled yarn. However, in order to optimally implement the present invention, It is preferable to provide entanglement such that the length of the entangled portion is long and the length of the spread portion is short. It is better to apply the entanglement to the raw yarn uniformly to the entire yarn, but from a practical standpoint, it is more preferable to set the number of entanglements to 40 or more, preferably 50 or more. Yarn is obtained. Note that the degree of entanglement can be measured as follows. In other words, when the entangled raw yarn is floated on water in a container, the unentangled part opens to several times the thickness, while the entangled point does not open. Read numbers visually. Further, as the interlacing processing nozzle, an interlace processing nozzle is suitable, but a taslan nozzle can also be used. In terms of process, it may be wound up once after the interlacing process, or it may be simultaneously stretched and false-twisted without being wound up. Further, as the false-twisting device, a circumferential friction false-twisting device or a belt false-twisting method, which has a feeding effect, is more suitable than using a spinner. By the way, the composite yarn of polybutylene terephthalate and polyethylene terephthalate used for the core yarn is
It is better to have an elongation of 80% or more, and the elongation is 60%.
The desired properties are obtained when co-stretching and false-twisting at a stretching ratio of ~80%. If this stretching ratio is low, the elongation (stretchability) of the woven fabric will be poor, and if it is too high, processing stability will not be obtained and yarn breakage will occur easily. On the other hand, the yarn used for the winding yarn is preferably polyethylene terephthalate, etc., and the elongation of the raw yarn must be at least 100% higher than the elongation of the core yarn.
150% or more is preferable. The core yarn in the present invention is made of polybutylene terephthalate and polyethylene terephthalate, but these may be copolymerized with a third component in a proportion of 15 mol% or less, or may contain additives such as quenching agents, coloring agents, and flame retardants. Further, the cross-sectional shape of the filament of the undrawn yarn and the partially oriented yarn, the amount of the additive, etc. are not particularly limited. In addition, in this case, the denier of the undrawn yarn and partially oriented yarn should be selected depending on the application, and generally the denier ratio of (wrapped yarn/core yarn) in the total denier is
It is best to set it to 0.7 or more, and it is recommended that both the wrapped yarn and the core yarn De be 50 to 300 de. Also, the wrapped yarn single fiber De after processing should be 3 de or less, and the core yarn single fiber De should be 3 de.
In the above cases, particularly favorable texture and stretch properties can be obtained. This combination of yarns provides bulkiness, a soft feel on the surface, and resilience, as well as sufficient stretch performance. As described above, the present invention provides an improved alternately twisted two-layer structure yarn that can provide a spun-like woven striped material that has appropriate twist texture, fullness, and flexibility, and also has sufficient stretch. is obtained. The present invention will be explained below with reference to Examples. Example Polybutylene terephthalate having an intrinsic viscosity [η]=0.78 and polyethylene terephthalate having an intrinsic viscosity [η]=0.38 were composite-spun side-by-side at a ratio of 5:5. The spinning speed at this time was 2500 m/min.
Partially oriented yarn POY with 220de/48fil and elongation of 148% was obtained. On the other hand, polyethylene terephthalate with [η] = 0.64 was spun at 1400 m/min, 220 de/72 fil, and elongation 345.
% of undrawn yarn was obtained. These two yarns are pulled together and combined by a guide 3 using the false twisting process shown in FIG. Overfeed rate 1%,
58 entanglements/m were applied at a compressed air pressure of 4 kg/cm ² , and then the temperature of the heater 8 was 175°C, the surface speed of the friction false twisting device 9 was 650 m/min, and the second delivery roller 10 was It was simultaneously stretched and false-twisted at a speed of 350 m/min and wound up as Cheese 11. The resulting processed yarn had a two-layer structure as shown in FIG. On the other hand, as a comparative example, the following experiment was conducted. Polyethylene terephthalate with an intrinsic viscosity [η] = 0.63 was spun at a spinning speed of 3500 m/min, and the elongation was 115.
% 225de/30fils filament and spinning speed 1200
Polyester filament yarn (225 de/fils) with an elongation of 360% obtained by spinning at m/min was aligned and subjected to interlacing treatment and stretch false twisting under the same conditions as in the example in the process shown in Figure 1. Ta. The obtained processed yarn had a two-layer structure as shown in FIG. 2, similar to the example. The stretchability of the processed yarns of these Examples and Comparative Examples was evaluated by making them into the following plain woven fabrics. Add 2 pieces of root polyester 150de/48 to the warp, 45 pieces of 1 heater woolly processed yarn, and add the test yarn to the weft to create a plain woven fabric with 65 mesh.Relax, preset (180℃ x 45 seconds) ) 130
℃ high pressure dyeing finishing set (160℃ x 45 seconds) process. Note that no finishing resin processing was performed. Take this plain woven fabric with a width of 5 cm in the warp direction and an effective length of 20 cm in the weft direction, add a weight of 1.5 kg, and measure the length after 1 minute by l ₁
shall be. Recovered length 1 minute after removing the load
l ₂ was measured, and the elongation rate and recovery rate were calculated using the following formula. Elongation rate (%) = l ₁ -20/20 x 100 Recovery rate (%) = 1 - l ₂ -20/l ₁ -20 x 100 These results are shown in the table below.

[Table] From the above results, the effect of the side-by-side type composite yarn of polybutylene terephthalate and polyethylene terephthalate of the present invention is clearly recognized in the elongation rate and recovery rate. Also, the texture was span-like.

[Brief explanation of the drawing]

FIG. 1 is a schematic view showing one embodiment of an apparatus for manufacturing the processed yarn of the present invention, and FIG. 2 is an enlarged side view of the yarn structure of the processed yarn of the present invention. 1, 2... Yarn, 3... Guide, 4... Tension device, 5... Feed roller, 6... Interlacing nozzle, 7... First delivery roller, 8... Heater, 9... False twisting Ingredients, 10... Second delivery roller, 11... Rolled cheese, 12... Core yarn, 1
3... Thread with winding.

Claims (1)

[Claims] 1 A false twisted crimped yarn made of two types of filament yarns, one of which is a core yarn and the other filament yarn is wound around it, and some of the filaments that make up the wound yarn are core filaments. In this two-layer yarn, the filaments forming the core are made of polybutylene terephthalate polymer and polyethylene terephthalate polymer. A stretchable spun-like processed yarn characterized by being composed of a polymer side-by-side composite yarn.