JPH0123576B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to a bulky yarn obtained by combining two or more types of multifilament yarns having different thermal properties, that is, heat shrinkage rates. [Prior Art] Many bulky yarns obtained by combining two or more types of multifilament yarns having different heat shrinkage rates have been proposed. Such bulky yarns produce loops and sag in the fibers of low-shrinkage multifilament yarns due to the contraction of high-shrinkage multifilament yarns, and are bulky due to the difference in shrinkage occurring at the yarn stage. It also includes fabrics such as woven or knitted fabrics that exhibit shrinkage differences during post-processing such as dyeing and become bulky. These bulky yarns are used in a variety of ways in the textile and knitting industry because they exhibit spun-like properties that give bulk, surface irregularities, and luster to fabrics that cannot be obtained with multifilament yarns. . However, various problems have been pointed out in bulky yarns that exhibit bulkiness simply due to differential shrinkage, partly due to increasing demands from the industry. The first is that it has insufficient bulk compared to the so-called Taslan processed yarn, and the second is that many of the conventional bulky yarns due to differential shrinkage are subjected to relaxation heat treatment after drawing and are used as low-shrinkage multifilament yarns. This is similar to a high-shrinkage multifilament yarn that has not been subjected to relaxation heat treatment, which not only limits the shrinkage difference but also requires the process of applying relaxation heat treatment, which is disadvantageous in terms of cost. The third point is that if there is even a slight difference in dyeability between a high-shrinkage multifilament yarn and a low-shrinkage multifilament yarn, a scratchy discoloration tends to occur. This third scratchy discoloration is relatively harmless if it is uniform as a whole, but it becomes visible as dyeing spots due to the non-uniformity of the fiber mixture of both multifilament yarns. is considered a problem because it reduces the product value. Therefore, methods of combining and twisting high-shrinkage and low-shrinkage multifilament yarns to make the composite state uniform, or aligning and false-twisting both multifilament yarns to improve bulk and uniformity of the blended fibers are also available. be exposed. However, with these methods, it is difficult to obtain a bulky yarn with a core-sheath structure that is excellent in bulk and in which high-shrinkage fibers occupy the core and low-shrinkage fibers occupy the outside. In other words, the combined and twisted product has a core-sheath structure in which the high-shrinkage multifilament yarn shrinks and occupies the core, and the low-shrinkage multifilament yarn is wound around it, but the high-shrinkage fibers Since the shrinkage of the fibers is not sufficiently performed due to the restraint by the twisting yarns, the bulkiness and the core-sheath structure are incomplete, and since a twisting process is required, it is disadvantageous in terms of cost. On the other hand, those that have been subjected to the pulling and false twisting process have excellent bulk, but at the stage of false twisting, the shrinkage of the high shrinkage fibers is constrained in the same way as in the case of plied twisting, and because it is being pulled and twisted, The core-sheath structure becomes very non-uniform. On the other hand, if a bulky yarn with a core-sheath structure that has excellent bulk can be obtained, it is possible to use fine denier fibers for the outer low shrinkage fibers to give the fabric a softer surface touch. . [Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and provides a uniform core-sheath structure without the need to subject a low-shrinkage multifilament yarn to relaxation heat treatment and without using a twisting process. To provide a spun-like bulky yarn using two or more types of multifilament yarns having different heat shrinkage rates, which is excellent in bulk, and can also impart a soft surface touch to a fabric. [Structure of the Invention] The present invention involves blending a high shrinkage multifilament yarn made of a copolymer mainly composed of nylon 6 and a low shrinkage synthetic fiber multifilament yarn through a turbulent flow nozzle, and then subjecting the fibers to a false twisting process. The present invention is a mixed fiber bulky crimped yarn obtained by the above method, and the above object is achieved by this structure. That is, in the present invention, the bulk shrinkage multifilament yarn contains a copolymer mainly composed of nylon 6 or ε-caproamide, preferably nylon 66 salt or hexamethylene diammonium adipate to ε-caprolactam in a molar ratio of 1:1. By using a polymer copolymerized at a ratio of 0.08 to 0.5, a boiling water shrinkage rate difference of 20% or more can be easily obtained without subjecting the low-shrinkage synthetic fiber multifilament yarn to relaxation heat treatment. A copolymer mainly composed of nylon 6 is a copolymer with nylon 66 because of the physical properties of fibers, dyeability, and the ability to obtain a high heat shrinkage rate with a small copolymerization ratio. Preferably, the molar ratio of nylon 66 salt to ε-caprolactam is 1:0.08 to 1:0.08, since a boiling water shrinkage rate of 25% or more can be obtained and the spinnability during spinning is also excellent.
A copolymer in the range of 0.5 is preferred. When the molar ratio of this nylon 66 salt is less than 0.08, the boiling water shrinkage rate of the obtained multifilament yarn will be less than 25%, resulting in a shrinkage rate difference of more than 20% with the low shrinkage multifilament yarn. things become difficult. Furthermore, if the proportion of nylon 66 salt exceeds a molar ratio of 0.5, the spinnability during spinning will decrease and it will be difficult to stably obtain multifilament yarn. Even if it were, the strength and elongation would be insufficient and it would be difficult to withstand practical use. The most preferred range of nylon 66 salt is a molar ratio range of 0.14 to 0.25, according to which:
Excellent results can be obtained in terms of spinnability, strength and elongation of the obtained multifilament yarn, and shrinkage rate. The spinning method is preferably direct drawing in which spinning and drawing are performed consecutively, or high-speed spinning in which sufficient fiber properties can be obtained while spinning. Direct drawing and high-speed spinning have improved spinnability, drawability and It is possible to obtain excellent results in terms of both strength and elongation and heat shrinkage of the obtained multifilament yarn. In addition, the low shrinkage multifilament yarn used in the present invention has a boiling water shrinkage rate of about 10% or less, preferably several % or less, it is not limited to the type of synthetic polymer. That is, ε-
It may be made of any polymer such as polycaproamide, polyhexamethylene adipamide, polyester, polyacrylonitrile, etc., and the dyeability is different from that of high shrinkage multifilament yarn, or it is easily dyed or difficult to dye. It can be anything. However, especially for fabrics with a soft texture, it is preferable to use multifilament polyamide yarn. Since this low shrinkage multifilament yarn wraps the outside of the bulky yarn of the present invention, it greatly influences the feel of the fabric. Therefore, when applied to fabrics with a suede-like touch, it is preferable that the constituent single fiber denier of the low-shrinkage multifilament yarn is 1.0 de or less.
Further, it is preferable that the above-described low-shrinkage multifilament yarn is also spun by direct drawing or high-speed spinning. Direct drawing and high-speed spinning can produce constituent single fibers with a denier of 1.0 de or less more stably and at lower cost than by the spinning-separate drawing method. In the present invention, the high shrinkage multifilament yarn and the low shrinkage multifilament yarn as described above are mixed together through a turbulent flow nozzle and then subjected to false twisting. If you overfeed the low shrinkage multifilament yarn, as mentioned above, you will not be able to obtain a uniform core-sheath structure, and if you overfeed the low shrinkage multifilament yarn during pulling, the low shrinkage multifilament yarn will not have sufficient false twisting. This is to solve the problem that the low shrinkage multifilament yarns are easily separated without being crimped. In the false twisting process, the fibers of the high shrinkage multifilament yarn serve as the core, and the fibers of both multifilament yarns can be given sufficient false twist crimp without the low shrinkage multifilament yarn separating, and therefore, Excellent bulk and uniform core
This is because bulky yarn having a sheath structure can be stably obtained. As the turbulent nozzle for this fiber mixing, a nozzle for taslan processing, which causes entanglement and loops in the fibers of multifilament yarn, and a nozzle for interlace processing, which mainly causes entanglement, are used. However, if the nozzle for Taslan processing is used under normal Taslan processing conditions, the core-sheath structure of the composite yarn will be incomplete, so it is preferable to use the nozzle under conditions that do not cause the fiber loops of high-shrinkage multifilament yarn to become large. , the result is a nozzle that is substantially the same as an interlace processing nozzle. For turbulent flow nozzles, low shrinkage multifilament yarns are used for
It is preferable to pass the composite yarn with an overfeed in the range of 10%, and the conditions for mixing the fibers are preferably such that as a result of passing through a turbulent flow nozzle, the number of entanglements of 10 pieces/m or more is generated in the composite yarn. The number of entanglements is also called the degree of interlacing, and is measured by the number of times the needle movement is blocked when a needle is inserted into the composite yarn and moved in the length direction. This measurement method is called the drop method. This is a known method. By overfeeding the low shrinkage multifilament yarn, the ability of the low shrinkage multifilament yarn to restrain the thermal shrinkage of the high shrinkage multifilament yarn is rapidly reduced. However, when the overfeed greatly exceeds 10%, both multifilament yarns tend to separate. If the degree of interlacing is too low, it will be the same as pulling, but if it is more than 10 pieces/m, blending is sufficient, and composite yarns mixed in this way will have high shrinkage during false twisting. The fibers of the multifilament yarn serve as the core, and the fibers of both multifilament yarns are given sufficient false twist crimp, resulting in a uniform core-sheath structure with the fibers of the low shrinkage multifilament yarn occupying the outside. It becomes a bulky yarn with excellent properties. [Example] The present invention will be further described below with reference to illustrated examples. FIG. 1 is a schematic side view showing an example of an apparatus for manufacturing the mixed fiber bulky crimped yarn of the present invention, and FIG. 2 is a side view schematically showing the structure of the obtained mixed fiber bulky crimped yarn. . In FIG. 1, 1 is a high shrinkage multifilament yarn made of a copolymer mainly composed of nylon 6, 2 is a low shrinkage synthetic fiber multifilament yarn, and both yarns 1 and 2 are brought together by a drawer guide 3. A first supply roller 4 with a separating roller 4'
and supplied to the turbulent flow nozzle 5.
This figure shows an example in which both yarns 1 and 2 are fed to the turbulent flow nozzle 5 at a constant speed, but when overfeeding the low shrinkage multifilament yarn 2, it is necessary to use a pull-out guide 3 and a separating roller 4'. The first supply roller 4 may be provided for each yarn, and thereby both the drawn yarns 1 and 2 may be supplied together to the turbulent flow nozzle 5. Alternatively, the first supply roller 4 and separation roller 4' may be stepped, and the high shrinkage multifilament yarn 1 is pulled out at the small diameter portion, and the low shrinkage multifilament yarn 2 is pulled out at the large diameter portion, and alignment guides are provided as necessary. It is also possible to feed both yarns 1 and 2 together to the turbulent flow nozzle 5 by using . The turbulent flow nozzle 5 mixes and entangles the composite yarn, which is then turned into a false twister by a second supply roller 6 equipped with a separation roller 6' and a false twist set heater 7 and a false twist means 8. The composite yarn fed to the zone and thus false-twisted is taken up by a take-off roller 9 with a separating roller 9' and sent to a winding bobbin 10 where it is wound. taken. It goes without saying that the temperature conditions of the false twist set heater 7 and the number of false twists performed by the false twist means 8 are set to conditions that provide sufficient false twist crimp to the fibers of both multifilament yarns 1 and 2. As shown in FIG. 2, in the composite yarn obtained as described above, the fibers 1a of the high shrinkage multifilament yarn 1 which have been falsely twisted and crimped enter inside, and the fibers 1a of the low shrinkage multifilament yarn 2 are folded inside. The twisted and crimped fibers 2a come out to the outside and exhibit a core-sheath structure. Therefore, even if there is a difference in dyeability between the two fibers 1 and 2, the fibers 1a and 2 do not have a scratchy appearance. The bulkiness is very excellent due to the false twist crimp of 2a. Furthermore, when the low shrinkage multifilament yarn 1 is made of fibers having a constituent fiber denier of 1 de or less, the fabric obtained from this composite yarn has a suede-like feel. A specific embodiment of the present invention using the apparatus shown in FIG. 1 will be shown below. Example 1 A 50de/24/fil directly drawn yarn made of a copolymer with a molar ratio of nylon 66 salt to ε-caprolactam of 0.16 was used as the high-shrinkage multifilament yarn 1, and a 50de/24/fil directly drawn yarn made of a copolymer with a molar ratio of nylon 66 salt to ε-caprolactam of 0.16 was used as the low-shrinkage multifilament yarn 2. Using a yarn obtained by high-speed spinning of 40 de/64 fil, the taking-up speed of the take-up roller 9 was 600 m/min, the rotation speed of the false-twisting means 8 consisting of an internal false-twisting ring was 3500 rpm, and the contact type The temperature of the false twist set heater 7 is 170°C, the conditions of the first supply roller 4 and the turbulent flow nozzle 5 are set so that the composite yarn does not loosen up to the second supply roller 6, and each pneumatic pressure shown in Table 1 is used. A composite false twisted crimped yarn was obtained under the conditions that the number of entanglements could be obtained. Table 1 shows the results of comparing the bulkiness of the obtained yarns and the results of evaluating the texture of the fabric by performing a tube knitting process using the obtained yarns and dyeing the tube-knitted fabric through a sensory test. It was shown.

〔Effect of the invention〕

The mixed fiber bulky crimped yarn of the present invention does not require relaxing heat treatment on the constituent multifilament yarns and does not require synthetic fibers, so it can be manufactured with high efficiency and at low cost, has excellent bulk, and has uneven dyeing. is also difficult to appear,
It has many features such as an excellent spun-like feel. It should be noted that the present invention is not limited to the illustrated example, and may be obtained by once again false twisting the mixed fibers.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an example of an apparatus for manufacturing the mixed fiber bulky crimped yarn of the present invention, and FIG. 2 is a side view schematically showing the structure of the obtained mixed fiber bulky crimped yarn. . DESCRIPTION OF SYMBOLS 1... High shrinkage multifilament yarn, 2... Low shrinkage synthetic fiber multifilament yarn, 3... Drawer guide, 4... First supply roller, 5... Turbulent nozzle, 6... Second supply roller, 7 ...False twisting set heater, 8...False twisting means, 9...Take-up roller,
10... Winding bobbin.

Claims (1)

[Claims] 1. High shrinkage multifilament yarn made of a copolymer mainly composed of nylon 6 and low shrinkage synthetic fiber multifilament yarn are mixed together through a turbulent flow nozzle, and are further subjected to false twisting. A blended bulky crimped yarn. 2 The copolymer is nylon 6 and nylon
The mixed fiber bulky crimped yarn according to claim 1, which is a copolymerized polymer with a molar ratio of 66 to 1:0.08 to 0.50. 3. The mixed fiber bulky crimped yarn according to claim 1 or 2, wherein the low shrinkage synthetic fiber multifilament yarn has a single fiber denier of 1.0 de or less. 4. The mixed fiber bulky crimped yarn according to claims 1 to 3, wherein the high shrinkage multifilament yarn is obtained by direct drawing or high-speed spinning. 5. The mixed fiber bulky crimped yarn according to claims 1 to 4, wherein the low-shrinkage synthetic fiber multifilament yarn is obtained by direct drawing or high-speed spinning.