JPH0255534B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a method for producing a spun-like false twisted yarn, and more specifically, to a method for producing a spun-like false twisted yarn, which has a spun-like texture and touch, and also has appropriate stretchability (elasticity). This invention relates to a new method for producing processed yarn. <Prior Art> Conventionally, a two-layer yarn using false twisting has been manufactured by the method described below. In other words, two with different elongation
When threads of a size larger than the seed are fed to the supply roller in a aligned state and twisted using a false twisting spindle, the threads with low elongation are difficult to stretch, so they form the core of the thread.
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, the yarn with low elongation becomes a core yarn, and the yarn with high elongation is wrapped around it in an alternating twisted yarn form to obtain a two-layer crimped yarn. (Refer to the specifications of JP-A-49-72443 and JP-A-49-47644). On the other hand, as a manufacturing method for a double-layered yarn having the above-mentioned configuration, the winding yarn is overfed and wound by using the rotating torque of the core yarn in a twisted (false-twisted) state by a false twisting spindle. It is also known that it can be used (for example, see Japanese Patent Publication No. 45-28018). In the two-layer structured yarn obtained by the conventional method described above, the wound yarn is generally wound around the core yarn in an alternately twisted manner, which is a drawback of ordinary woolly textured yarn fabrics due to the twisted yarn structure. It has the characteristic of improving the slimy and fluffy feeling, but on the other hand, because the wound yarn is wound in a tight bundle, the core yarn cannot be crimped, and it is similar to ordinary woolly processed yarn. The drawback was that it lacked elasticity. <Object of the Invention> The object of the present invention is to improve the drawback of poor stretchability of the conventional alternately twisted two-layer structure yarn as described above, and to create a two-layer structure spun-like processed yarn with elasticity (stretchability). It is about providing. <Structure and Means of the Invention> As a result of various studies to achieve the above object, the inventors of the present invention found that since the core yarn is bundled by the wrapped yarn, the conventional crimping force of the core yarn cannot be used to tighten the bundle. It was confirmed that crimping can occur by overcoming the force. Therefore, we thought that the material that would become the core thread would be crimped, resulting in elasticity due to the crimp, and in the process of further investigation, we found that polyethylene with different intrinsic viscosities [η] _f were used as core threads with such characteristics. We have found that side-by-side composite yarns made of terephthalate polymers are useful. That is, the present invention provides side-by-side composite yarns made of polyethylene terephthalate polymers with a breaking elongation of 40% or less and different intrinsic viscosities [ _η ] This is a method for producing spunlike crimped yarn, which is characterized by aligning undrawn polyethylene terephthalate yarn with a polyethylene terephthalate of 100 to 200%, subjecting it to an interlacing treatment, and then false-twisting it. The present invention will be explained in detail below. Furthermore, as mentioned above, 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 core yarn is coated in a tightly bundled state, even after false twisting, conventional core yarns with a small crimp force will not develop crimp, and therefore, elasticity due to crimp cannot be expected. Therefore, even if such processed yarns have a good spun-like texture, they have poor crimpability when woven into fabrics, and when used in clothing, they create a feeling of pressure at the elbows and knees. Useful. This improvement is strongly desired, especially in sports clothing. Therefore, in order to compensate for the drawbacks of this two-layer structure yarn, in the past, yarns that were interwoven with stretchy woolly processed yarns or so-called covered yarns that covered spandex were used. There are problems such as the super-like texture of the yarn being reduced by half, and the price becoming higher and requiring more time and effort. In this regard, according to the studies of the present inventors, in order to solve the above-mentioned problem, even when the core yarn is bundled by the wound yarn of the double-layer structure yarn, the crimp development force of the core yarn is It has become clear that the crimp must overcome the tightening force of the wound yarn to cause crimp. If the core yarn is made of polyethylene terephthalate polymers with different intrinsic viscosities [η] _f which are bonded together in a side-by-side manner as a core yarn with a high crimp force, an appropriate stretching effect can be obtained and the span can be increased. It has been found that the like texture is not impaired. The intrinsic viscosity [η] _f on the low intrinsic viscosity side constituting the side-by-side composite yarn of the polyethylene terephthalate polymer used for this core yarn is preferably 0.33 or more and 0.45 or less, while the [η] on the high intrinsic viscosity side It is preferable that _f is larger than [η] _f on the low intrinsic viscosity side in the range of 0.20 to 0.30, and the larger the difference in [η] _f between these two, the better the desired elasticity. Become. If [η] _f of this low intrinsic viscosity component is less than 0.33, bending may occur during melt spinning and spinning may become impossible, whereas if it exceeds 0.45, [η] _f of the high intrinsic viscosity component will become too high. , it becomes difficult to obtain a drawn yarn with sufficient molecular orientation. Furthermore, if Δ[η] _f is less than 0.20, sufficient latent crimpability is insufficient, making it difficult to obtain a highly crimped yarn suitable for clothing. On the other hand, if Δ[η] _f exceeds 0.30, the spinneret surface will bend significantly toward the high [η] _f side during spinning, and may eventually adhere to the spinneret surface, making spinning impossible. In this case, it is preferable to set the composite ratio of the high [η] _f component and the low [η] _f component to 30:70 to 70:30% by weight because stable spinning can be achieved. Also, as a composite method, the side-by-side type has better stretching performance, but even the eccentric sheath/core type can provide a certain degree of stretching performance. In addition, the intrinsic viscosity [η] _f is the intrinsic viscosity measured with a free hole filament, and the hanging-hole filament is a free hole filament in which the polymer on one side is stopped and 4 of the other polymer is spun under the side-by-side composite spinning conditions. Measure from the filament in the hole (free fall). In this case, [η] _f was measured in an O-700 phenol solution at 35°C. Hereinafter, an example of obtaining a spunlike crimped yarn of the present invention using the above composite yarn will be described 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 by a guide 3 and then passed through a tension adjusting device 4 and a feed roller 5.
The yarn is then supplied to an air injection nozzle 6 for interlacing the mixed fabric, where it is turned into an interlaced yarn having 30 or more interlacing points/m. Next, this intertwined yarn is supplied to the false twisting zone by the first delivery roller 7, passes through the heater 8 and the false twisting tool 9, is taken off by the second delivery roller 10, and is then wound up as cheese 11. What is important here is that the core yarn and the wrapped yarn may separate due to repeated expansion and contraction of the processed yarn, which can actually cause problems, so intertwine the core yarn and the wrapped yarn, It is necessary to stabilize the yarn 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 applied, the entangled portion and the spread portion become repeating units to form an entangled yarn, but in order to optimally carry out 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, a more preferable processed yarn can be obtained if the number of entanglements is 40 or more, preferably 50 or more. , Incidentally, the degree of entanglement can be measured as follows. In other words, when the entangled raw yarn is floated in water in a container, the unentangled part opens to a thickness several times larger, while the intertwined points do not open. Read with your eyes. Furthermore, although a nozzle for interlace processing is suitable as the entangling processing nozzle, other nozzles for taslan processing can also be used. In terms of the process, after interlacing, it may be wound once, or it may be subsequently false-twisted without winding. 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, polyethylene terephthalate and side-by-side composite yarns with different intrinsic viscosities used as core yarns have an elongation of 40% or less, preferably 15 to 30%.
It is preferable to have an elongation of . This is because the composite yarn that becomes the core yarn needs to maintain a high crimp rate even if it is not false-twisted, and for that purpose, the degree of orientation must be sufficiently increased, and as a measure of this, the elongation of the composite yarn is 40 It is necessary to keep it below %. If the elongation exceeds 40%, the crimpability of the two-layer yarn will be reduced, and the stretchability of the fabric will be poor. On the other hand, the elongation of the undrawn polyethylene terephthalate yarn serving as the wound yarn is preferably 100 or more and 200% or less. Since the elongation of the composite yarn serving as the core yarn is 40% or less, substantially stretching it during false twisting deteriorates processability. On the other hand, since the undrawn polyethylene terephthalate yarn is intertwined with the composite yarn and false-twisted, it is not substantially stretched and is fixed by receiving heat from the heater. For this reason,
If the undrawn yarn does not have a sufficiently high degree of orientation, it will become brittle and unusable. To increase the orientation, it is convenient to spin polyethylene terephthalate at high speed, but in this case, the spinning speed must be 2300 m/min or higher to obtain an undrawn yarn that has enough strength to withstand use after heat setting. It is preferable that the undrawn yarn elongation at this time corresponds to approximately 200%. When the spinning rate is further increased, the degree of orientation further increases,
This is more preferable, but if the spinning speed is higher than 3700 m/min, the elongation will be less than 100%, and if simultaneous false twisting is performed using this, the elongation difference will be insufficient and the spalle-like texture will not be obtained. It's not enough anymore. The yarn in the present invention is a polyethylene terephthalate polymer, but these
The polymer may be copolymerized with a third component in a proportion of 15 mol % or less, and the polymer may contain additives such as a quenching agent, a coloring agent, and a flame retardant. or,
The cross-sectional shapes of the two types of filaments, the amount of the additives, etc. are not particularly limited. In addition, the denier should be selected depending on the application, and generally the denier ratio of winding yarn/(core yarn + winding yarn) is
It is recommended that the De of the wound yarn and the core yarn be 50 to 300 de. Also, the De of the single fiber of the wound yarn after processing should be 5 de or less, and the De of the single fiber of the core yarn should be 5 de or less.
Particularly preferable hand feel and stretchability can be obtained when it is 2.5 de or more. This combination of core threads makes it possible to have a sublime quality, a soft surface feel, and repulsion, as well as appropriate stretch performance. <Effects of the Invention> As described above, according to the present invention, composite yarns with different [η] _f differences are used as the core yarn of the double-layered false twisted yarn, so that in addition to appropriate twisted yarn texture, fullness, and flexibility, An improved two-layer yarn structure that can provide a spun-like woven or knitted fabric that also has appropriate stretchability is obtained. <Example 1, Comparative Example 1> Polyethylene terephthalate with an intrinsic viscosity of [η] _f = 0.63 and polyethylene terephthalate with an inherent viscosity of [η] _f = 0.35 were spun side-by-side at a ratio of 5:5, and continuously spun without winding. The spun yarn was then directly drawn to obtain a drawn composite yarn. The spinning speed at this time is
The drawn yarn obtained at 750 m/min and a drawing ratio of 3.6 times is
It was 148 de/48 fils and had an elongation of 25%. On the other hand, polyethylene terephthalate with [η] _f = 0.63 was spun at a spinning speed of 3500 m/min with an elongation of 118%.
Partially oriented yarn POY of 227 de/48 flis was obtained. These two yarns are pulled together and combined by a guide 3 using the false twisting process shown in Fig. 1, and then fed to an interlace nozzle 6 for blending and interweaving via a tension adjustment device 4 and a feed roller 5. and overflow rate of 1.5%,
58 entanglements/m were applied at a compressed air pressure of 1.5 Kg/cm ² , and then the temperature of the heater 8 was 200°C, the surface speed of the friction false twisting device 9 was 650 m/min, and the speed of the second delivery roller 10 was 350 m/min. The yarn was false-twisted under conditions of 10 minutes and wound up as Cheese 11. On the other hand, as a comparative example, the following experiment was conducted. The undrawn yarn obtained by spinning polyethylene terephthalate with an intrinsic viscosity [η] _f = 0.63 at a spinning speed of 1300 m/min was drawn at a draw ratio of 3.0, and the elongation was 30%.
A drawn yarn of 150 de/48 fils and the same partially oriented polyethylene terephthalate yarn as used in the example were aligned and subjected to intertwining and false twisting in the process shown in FIG. 1 under the same conditions as in 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. Root polyester 150de/48fils for warp,
1 Heater woolly processed yarn is made into 2 pieces of 45 yarns, the weft yarn is made of 65 yarn, and a plain woven fabric is created.
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 take the length after 1 minute as ₁ . Furthermore, the load was removed, the recovered length ₂ after 1 minute was measured, and the elongation rate and recovery rate were calculated using the following formula. Elongation rate (%)=[( _1-20 )/ ₂₀ ]×100 Recovery rate (%)=[( _1-2 )/ _1-20 ]×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 polyethylene terephthalate with inherent viscosity difference of the present invention is clearly recognized in the elongation rate and recovery rate.
In addition, the texture was span-like and bulky. <Examples 2 to 5, Comparative Examples 2 to 5> Difference between low [η] _f side [η] _f and high [η] _f side [η] _f of side-by-side composite yarn in Example 1 [η] The same procedure as in Example 1 was carried out except that _f was changed as shown in Table 2. The obtained processed yarn was woven by hand in the same manner as in Example 1, and the elasticity and texture were evaluated. Table 2 shows the results. These textured yarns were subjected to a drawing and false twisting process according to the method of the present invention, and each texture was suitable for use in clothing, and the fabrics were stretchable.

【table】 [Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1, 2... Yarn, 3... Guide, 4... Tension adjustment device, 5... Feed roller, 6... Interlace nozzle, 7... First delivery roller, 8... Heater, 9... False twister, 10... Second Delivery roller, 11...rolled cheese.

Claims (1)

[Scope of Claims] 1. Side-by-side type composite yarns of polyethylene terephthalate polymers having elongation at break of 40% or less and different intrinsic viscosities [ _η ] A method for producing a spun-like crimped yarn, which comprises aligning undrawn polyethylene terephthalate yarn with a breaking elongation of 100 to 200%, subjecting it to interlacing treatment, and then false twisting the yarn. 2. [η] _f on the low intrinsic viscosity side of the side-by-side composite yarn is 0.33 to 0.45, and the difference in intrinsic viscosity between the components Δ[η] _f is 0.2 to 0.30, as described in claim 1 A method for producing spun-like crimped yarn.