JPS6250583B2 - - 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. It is about improvement. 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, a core yarn in a twisted (false-twisted) state is produced using a false-twisting spindle. It is also well known to use rotational torque to overfeed the winding yarn while winding it. (For example, see Japanese Patent Publication No. 45-28018.) In the double-layered yarns obtained by these methods, the wound yarns are generally wound around the core yarn in an alternately twisted manner. , it has the advantage of improving the sliminess and bulkiness that are the drawbacks of ordinary woolly processed yarn fabrics, but on the other hand, since the wrapped yarn is wrapped in a tight bundle, crimp of the core yarn occurs. It had the disadvantage that it lacked the elasticity of ordinary woolly thread. The purpose of the present invention is to improve the drawback of poor elasticity of the conventional alternately twisted two-layer structure yarn as described above, and to provide a two-layer spunlike processed yarn with elasticity (stretchability). It is in. As a result of various studies to achieve the above object, the present inventors found that since the core yarn is bundled by the wrapping yarn, the crimping force of the conventional core yarn can overcome the binding force, and the crimping It was confirmed that it could not be expressed. Therefore, we assumed that if we used a core yarn with a greater crimp force than the previous one, the core yarn would also develop crimp, and as a result, stretchability would occur due to crimp, and we further investigated. In the process, I learned that a side-by-side composite yarn of polyurethane elastomer and polyamide 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, in which one filament yarn is used as a core yarn and the other filament yarn is wound around it, and a part of the filaments constituting the wound yarn is a core yarn. In this two-layer yarn, the filaments that make up the core are randomly mixed and intertwined with the filaments of the core yarn, and the crimped yarn as a whole is wound around the core yarn in an alternating manner.・A stretchy crimped yarn characterized by being made of bi-side type composite yarn. The present invention will be explained in detail below. As mentioned above, in the production process of conventional two-layer spunlike textured yarn, the other yarn under low tension is wound around the core yarn under high tension during false twisting, resulting in a wrapped 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 if such processed yarn has a good spun-like texture, it has poor stretch properties when made into a woven fabric, and when used in clothing, it can cause a feeling of pressure at the elbows and knees. become. Conventionally, in order to compensate for the drawbacks of this two-layer yarn, yarns with a stretchy woolly textured yarn or so-called covering yarn, which covers spandex, were used. There are problems such as the spun-like texture of the structural yarn 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 thread is bundled by the winding thread in the two-layer structure winding thread, the winding of the core thread must be It has become clear that the crimp force must overcome the tightening force of the wrapped yarn to cause crimp development. As a material with great crimp-generating power, use of a polyurethane elastomer and a polyamide polymer composite bonded side-by-side can produce a remarkable stretching effect, as well as provide a spun-like effect. It has been found that the texture is not impaired. The polyurethane elastomer of the composite yarn used for the core yarn of the present invention must be able to be melt-spun, and usually has a melting point of 200-240℃ and a hardness of 90-100℃.
are used. Here, polyurethane elastomer refers to polyester having a hydroxyl group at the end, or poly(oxyalkylene) glycol, diisocyanate, and glycol chain extender having a molecular weight of 1000 to 3000, and in some cases, a chain extender having a hydroxyl group at the end. It is a thermoplastic polyurethane obtained by further adding a polycarbonate having the following properties and reacting it. In this case, polyesters include adipic acid, sebacic acid, which is a dibasic layer, and diols such as ethylene glycol, butylene glycol, and diethylene glycol, and poly(oxyalkylene) glycols include poly(oxyethylene) glycol, poly( Block copolymers and homopolymers such as oxypropylene glycol and poly(oxybutylene) glycol are used.
In addition, as the diisocyanate, 2,4-tolylene diisocyanate, diphenylmethane-4,
4'-diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, etc. are selected. As a chain extender, ethylene glycol, propylene glycol, butylene glycol, 1,4-β
-Hydroxyethoxybenzene etc. can be used.
Furthermore, the optionally used polycarbonate must be polymerized from bisphenol A and phosgene, or bisphenol A and diphenyl carbonate, and must have terminal hydroxyl groups. As the polyamide, which is the other component forming the side-by-side type composite yarn, nylon 6, nylon 66, nylon 610, nylon 11, nylon 12, nylon 13, etc. can be used.
It is necessary to select a combination of these two components that has good compatibility and adhesion so that the two components do not separate during the spinning, drawing, processing, and fabric-making steps. As the polyurethane elastomer, it is particularly preferable to use caprolactone-based or polycarbonate-based polyurethane. In order to improve the light resistance of these elastomers and polyamides, a light resistance improving agent such as a benzophenone compound, a benzotriazole compound, or an inorganic manganese compound may be added. As for the composite method of polyurethane elastomer and polyamide, the side-by-side type has better stretch properties, but even the eccentric sheath core type has some stretch performance. Further, the composite ratio of the two components is preferably 3/7 to 7/3. An example of manufacturing the stretchable crimped yarn of the present invention using the thus obtained composite yarn will be described below. In FIG. 1, the composite yarn (filament yarn) 1 and the 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 fibers are then supplied to an air injection nozzle 6 for mixing and entangling, where they are made into entangled yarn. 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 is taken off by the second delivery roller 10.
It is rolled up as cheese 11. The processed yarn thus obtained is a stretchable crimped yarn having a two-layer 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 repeated expansion and contraction of the core yarn of processed yarn can cause the core yarn and alternately twisted wrapped yarn to separate, which can cause problems in practice. 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 performed, the entangled portion and the spread portion form a repeating unit to form an entangled yarn. However, 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 preferable to apply the interlacing to the raw yarn uniformly over the entire yarn, but from a practical standpoint, it is more preferable that the number of entanglements is 40 or more, preferably 50 or more. Note that 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 portion opens to a size several times larger, while the entangled points do not. Read the number of points visually. Further, as the entangling processing nozzle, an interlace processing nozzle is suitable, but a taslan nozzle can also be used. In terms of process, after the interlacing process, it may be wound once, or it may be simultaneously stretched and false-twisted without being wound up. Furthermore, as the false-twisting device, a multi-contact type friction false-twisting device or a belt false-twisting method, which has a feeding effect, is more suitable than using a spinner. Incidentally, the composite yarn of polyurethane elastomer and polyamide used as the core yarn preferably has an elongation of 80% or more, and when simultaneously stretched and false-twisted at a stretching ratio of 60 to 80% of the elongation, the desired properties can be achieved. is obtained. If the stretching ratio is low, the elongation (stretchability) of the woven fabric will be poor, and if it is too high, the processing will be unstable and yarn breakage will occur easily. On the other hand, the yarn used as the wrapping yarn is preferably polyethylene terephthalate or the like, and the elongation of the raw yarn must be 100% or more greater than the core yarn elongation, particularly preferably 150% or more. Incidentally, the polymer constituting the core yarn in the present invention may contain additives such as a matting agent, a coloring agent, and a flame retardant. Further, the cross-sectional shapes of the filaments of the undrawn yarn and the partially oriented yarn, the above-mentioned additives, 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 in general, it is best to set the denier ratio of (wrapped yarn/core yarn) to 0.7 or more in the total denier. and core thread denier are both 50-300 de
In addition, when the manufactured single fiber denier after processing is 3 de or less, and the core yarn has a single fiber denier of 3 de or more, particularly preferable hand and stretch properties can be obtained. This combination of yarns provides bulkiness, a soft surface feel, and resilience, as well as sufficient stretchability. As described above, the present invention provides an improved alternately twisted two-layer structure yarn that can provide a spun-like woven or knitted fabric that has appropriate twist texture, swelling, and flexibility, and also has sufficient stretchability. is obtained. The present invention will be explained below with reference to Examples. Example Using nylon 6 (intrinsic viscosity [η] = 1.1) and polyurethane elastomer component, Elastran E995 (carbonate type) (manufactured by Nippon Elastran KK), which is a commercially available thermoplastic polyurethane, was used. were melted separately at 230°C and heated side-by-side to 245°C.
The composite was spun using a side-type spinneret. The spinning speed at this time was 2200 m/min, 225 de/48 fils, and elongation 153%.
A partially oriented yarn POY was obtained. On the other hand, polyethylene terephthalate with [η] = 0.64 was spun at 1400 m/min.
An undrawn yarn with 222 de/72 fils and elongation of 345% was obtained. These two types of yarns are aligned, twisted together by a guide 3 using the false twisting process illustrated in FIG. At an overfeed ratio of 1.0% and a compressed air pressure of 4 kg/cm ² G, 55 entanglements/m were applied, followed by a stretching ratio of 1.5 times, a temperature of the heater 8 of 170°C, and a surface of the friction false twisting device 9. Circumferential speed
650m/min, speed of second delivery roller 10
It was simultaneously stretched and false-twisted at a speed of 350 m/min and wound up as Cheese 11. The obtained processed yarn is the second
The yarn had a two-layer structure as shown in the figure. Comparative example Polyethylene terephthalate with 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
A polyethylene terephthalate filament yarn (225 de/72 fils) with an elongation of 360% obtained by spinning at m/min was aligned and subjected to entangling treatment and stretch false twisting under the same conditions as in the example in the process shown in Figure 1. I did it. The obtained processed yarn was used as the second yarn as in the example.
The result is a two-layered yarn as shown in the figure. The stretchability of the processed yarns of these Examples and Comparative Examples was evaluated by making them into the following plain woven fabrics. Polyester 150de/48fils1− for warp and root
Using heater woolly processed yarn in 2 pieces of 45 yarns, inserting the consideration yarn into the weft yarn, and creating a plain weave fabric with 65 yarn.
Normal relaxation, preset (180℃ x 45 seconds),
High pressure staining (130℃), finishing set (160℃ x 45 seconds)
passed through the 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 l ₁ . Furthermore, the load was removed, the recovered length 1 ₂ after 1 minute 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 the polyurethane elastomer and polyamide of the present invention is clearly recognized in the elongation rate and recovery rate. Also, the texture was soft and spun-like.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an 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 adjustment device, 5: Feed roller, 6: Interlace nozzle, 7: First delivery roller, 8: Heater, 9: False twister, 10: Second Delivery roller, 11: winding cheese, 12: core thread, 13: winding thread.

Claims (1)

[Claims] 1 A false twisted crimped yarn made of two types of filament yarns, in which one filament yarn is used as a core yarn and the other filament yarn is wound around it, and a part of the filaments constituting the wound yarn is different from the core filament. A two-layered yarn in which the crimped yarn as a whole is wound around a core yarn in an alternating manner while being randomly mixed and crossed, and the filaments that make up the core are made of polyurethane elastomer and polyamide polymer side-by-side. A stretchy crimped yarn characterized by being made of a patterned composite yarn.