JPS60252739A - Blended fiber bulky highly crimped yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 with different heat shrinkage rates have been proposed. Such bulky yarns produce loops and walnuts in the fibers of low-shrinkage multifilament yarns due to the contraction of high-shrinkage multifilament yarns. It also includes fabrics that become bulky due to differences in control during post-processing such as dyeing after being made into fabrics such as woven or knitted fabrics. These bulky yarns are used in a variety of ways in the textile and knitting industry because they exhibit spun-like properties that give fabrics electrical properties, surface irregularities, and luster 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 fish that has insufficient electrical properties compared to the so-called tanuran processed yarn, and the second is
Most of the conventional bulky yarns due to differential shrinkage are low 11M shrinkage multifilament yarns that are subjected to relaxation heat treatment after stretching, and high shrinkage multifilament yarns that are not subjected to relaxation heat treatment. The scale has a limit on the difference in shrinkage, and the process of applying relaxation heat treatment is troublesome and disadvantageous in terms of cost.The third problem is that there is no difference in dyeing between high-shrinkage multifilament yarn and low-shrinkage multifilament yarn. When there is a difference between the sexes, rosy-like heterochromia tends to occur.

This third scratchy discoloration is relatively harmless if it is uniform as a whole, but it can appear as dyeing spots due to the non-uniformity of the fiber mixture of both multifilament yarns. This reduces the value of the product and is considered a problem.

Therefore, we have developed a method in which high shrinkage and low 11i shrinkage multifilament yarns are combined and twisted to make the composite state uniform, and both multifilament yarns are aligned and false twisted to improve electrical properties and uniformity of mixed fibers. will also be held. However, these methods
It is difficult to obtain a bulky yarn with excellent electrical properties and a core-sheath structure in which high-shrinkage fibers occupy the core and low-shrinkage fibers occupy the outside. In other words, in the case of twisted and twisted yarns, the high-shrinkage multifilament yarns shrink and age the core, and the low-shrinkage multifilament yarns are wound around the core.
Although a sheath structure is formed, the contraction of the high shrinkage fibers is not sufficiently performed due to the restraint by the twisting yarns, so the development of electrical properties and the core-sheath structure are incomplete, and a twisting process is required. Therefore, it is disadvantageous in terms of cost. On the other hand, those that have been subjected to aligned false twisting have excellent electrical properties, but the shrinkage of high shrinkage fibers is restricted in the same way as when plied and twisted at the stage of false twisting, and because it is aligned, The core-sheath structure is very uneven.

On the other hand, if a bulky yarn with a core-sheath structure with excellent electrical conductivity can be obtained, a softer surface touch can be given to the fabric by using fine denier fibers for the outer low shrinkage fibers. .

LObject of the Invention The present invention has been made in view of the above-mentioned circumstances, and it is possible to obtain a uniform core-sheath structure without requiring a relaxing heat treatment on a low-shrinkage multifilament yarn 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 has excellent electrical conductivity and can also give a soft surface touch to a fabric.

[Structure of the invention]

The present invention involves mixing high shrinkage multifilament yarn made of a copolymer mainly composed of nylon 6 and low shrinkage synthetic fiber multifilament yarn together through a turbulent flow nozzle,
Furthermore, it is a mixed fiber bulky crimped yarn obtained by subjecting it to a false twisting process, and with this configuration, the above object is achieved.

That is, in the present invention, a high shrinkage multifilament yarn is mixed with a copolymer mainly composed of nylon 6, i.e., ε-caproamide, preferably nylon 66 salt, i.e., hexamethylene diammonium adipate, in a molar ratio of ε-caprolactam to ε-caprolactam. By using polymers 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 applying relaxation heat treatment to low-shrinkage synthetic fiber multifilament yarns. be able to.

ζ-, 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 large heat shrinkage rate with a small copolymerization ratio. Preferably, a boiling water shrinkage rate of 25% or more is obtained, and the spinnability during spinning is also excellent.
The copolymer preferably has a molar ratio of nylon 66 salt to ε-caprolactam of 1:0.08 to 0.5. The molar ratio of this nylon 66 salt is 0.
08. l:] If it is too small, the resulting multifilament yarn will have a water production shrinkage rate of less than 25%, making it difficult to obtain a linear rate difference of 20% or more with the low shrinkage multifilament yarn. Furthermore, if the proportion of Cairo 766 salt exceeds a molar ratio of 5, the spinnability during spinning will decrease and it will be difficult to stably obtain multifilament yarn. Even if it were obtained, the strength and elongation would be insufficient and it would be difficult to put it into practical use. The most preferable range of nylon 66 salt is a molar ratio of 0.14 to 0.25, which provides excellent results in terms of spinnability, strength and elongation of the obtained multifilament yarn, and shrinkage rate. can get. The spinning method is preferably direct drawing in which spinning and drawing are performed continuously, or high-speed spinning in which sufficient fiber properties can be obtained even after spinning. Direct drawing and high-speed spinning have improved spinnability, drawability and It is possible to obtain excellent results in both the strength and elongation of the obtained multifilament yarn and the heat shrinkage rate.

In addition, the low shrinkage multifilament yarn used in the present invention preferably has a boiling water shrinkage rate of about 10% or less in the state obtained by spinning, from the relationship with the heat shrinkage rate of the above-mentioned high shrinkage multifilament yarn. As long as it is a few percent or less, it is not limited to the type of synthetic fraction polymer. That is, it may be made of any polymer such as ε-polycaproamide, polyhexamethylene adipamide, polyester, polyacrylonitrile, etc., and the dyeability is similar to that of high-shrinkage multifilament yarns, or it is easy to dye. It may also be dyed with somemata Fi.

However, especially for fabrics with a soft texture, it is preferable to use multifilament polyamide yarns. 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 a fabric with a suede-like touch, it is preferable that the constituting single fiber denier of the low shrinkage multifilament yarn is 1.0 cie or less. Further, it is preferable to spin the yarn by using the above-described low-shrinkage multifilament yarn, direct drawing, or high-speed spinning. Direct drawing or high-speed spinning allows for stable production of constituent single fibers with a denier of 1.0 cle or less at a low cost compared to 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 during pulling, you will not be able to obtain a uniform core-sheath structure as mentioned above. This is to solve the problem that the low-shrinkage multifilament yarns tend to separate because they are not twisted and 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, thus making it more conductive. This is because bulky yarn with an excellent and uniform core-sheath structure can be stably obtained. As the turbulent nozzle for this cross-mixing, a nozzle for taslan processing, which causes entanglements and loops in the fibers of the 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. It is preferable to pass the low shrinkage multifilament yarn through the turbulent flow nozzle with an overfeed in the range of 0 to 10% than the high shrinkage multifilament yarn, and the conditions for mixing the fibers are such that as a result of passing through the turbulent flow nozzle, the composite yarn It is preferable to set the conditions such that the number of entanglements is 10 or more per m. The number of entanglements is also referred to as 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 known as the drop method. This is a well-known method called By overfeeding the low shrinkage multifilament yarn, the ability of the low shrinkage multifilament yarn to constrain the thermal shrinkage of the high shrinkage multifilament yarn is rapidly reduced. However, overfeed is 1
When it greatly exceeds 0%, both multifilament yarns become easy to separate. If the degree of interlacing is too low, it will be the same as aligned, but 10 pieces/m
If the above is the above, the amount of intermixing is sufficient, and in the composite yarn mixed in this way, the fibers of the high shrinkage multifilament yarn become the core during the false twisting process, and the fibers of both multifilament yarns are sufficiently twisted and crimped. The result is a bulky yarn with excellent electrical conductivity and a uniform core-sheath structure in which the fibers of the low-shrinkage multifilament yarn occupy the outside.

〔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 producing the mixed fiber bulky crimped yarn of the present invention, and Fig. 2 shows the obtained mixed fiber bulky yarn. FIG. 2 is a side view schematically showing the structure of a 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, and separated by a separating roller. It is drawn off by a first supply roller 4 with a roller 4' and fed to the turbulence nozzle 5. This figure shows both yarns 1 and 2 passing through the turbulent flow nozzle 5 at a constant velocity.
However, when overfeeding the low shrinkage multifilament yarn 2, the drawer guide 3
The first supply roller 4 provided with a separation roller 4' may be provided for each system, and both yarns 1 and 2 drawn out by the first supply roller 4 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, 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 using this method. The turbulent flow nozzle 5 mixes and entangles the composite yarns, which are passed through the separation roller 6.
The composite yarn that has been false-twisted is fed to the false-twisting zone consisting of the false-twisting set heater 7 and the false-twisting means 8 by the second supply row 26 equipped with a separator 9'. 9, the winding bobbin 1
0 and is wound up on a winding grain bin 10. It goes without saying that the temperature conditions of the false twist set heater 7 and the number of false twists by the false twist means 8 are set to conditions that give sufficient false twist and crimp to the fibers of both multifilament yarns 1 and 2. As shown in Fig. 2, the composite yarn obtained by The fibers 2a given the
It exhibits a sheath structure, and therefore, even if there is a difference in the dyeability of the facing fibers 1 and 2, it does not result in a hazy look, and due to the false twist crimp of the facing fibers 1a and 2a, it has very good electrical properties. Furthermore, when the low shrinkage multifilament yarn 1 is made of fibers having a denier of 1 de or less, the fabric obtained from this composite yarn has a suede-like feel to the touch.

A specific embodiment of the present invention using the apparatus shown in FIG. 1 will be shown below.

Example 1 High shrinkage multifilament yarn 1 was a directly drawn yarn of 50 de/24/fil made of a copolymer with a molar ratio of nylon 66 salt to ε-caglolactam of 0.16, and a low shrinkage multifilament yarn was used. Nairo y6 to 2
Using a yarn obtained by high-speed spinning of 40 de/64 fil, the yarn was taken at a take-up speed of 600 m/min by the take-up shear roller 9, at a rotational speed of 350 rpm of the false-twisting means 8 comprising an internal false-twist ring, and at a contact speed of 600 m/min. 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 such that the composite yarn does not loosen up to the second supply roller 6, and the pneumatic pressure shown in Table 1 is maintained. A composite false twisted crimped yarn was obtained under the conditions that each number of entanglements could be obtained. The results of comparing the bulkiness of the obtained yarns and the results of evaluating the texture by performing a tube knitting process using the obtained yarns, dyeing the tube knitted fabric, and performing a sensory test on the fabric are shown in the first table. Shown in the table.

Table 1 Example A 1.0 9 1.35 Good Example B 2.5 20 1.31 Good Example 0 3.
5 46 1.22 Good comparative example 2.5 16 1.0
0 Poor In Table 1, the comparative example is a case where 50 ae/24 filament yarn of nylon 6 was used as both the high shrinkage multifilament yarn 1 and the low shrinkage multifilament yarn. At Nokuruki, a tension of 0, 1 f/ae was applied to the obtained multiple false-twisted crimped yarn, and in that state the yarn was sandwiched between glass plates to form the sandwiched yarn as shown in Figure 2. The width was measured and expressed as a ratio of the width of the yarn of the comparative example to 1.

Regarding the texture, a texture similar to that of a knitted fabric using cotton yarn was considered good.0 As is clear from the results in Table 1, the blended bulky crimped yarn of the present invention has excellent electrical properties and can be made into a fabric. Gives a good texture to the case.

In addition, the results of evaluation after making woven fabrics with plain weave structures 9 and dyeing them using the obtained yarns also showed that the woven fabrics obtained by twisting the yarns of Example A-(3) had less dyeing unevenness and less bulkiness. It had an excellent, soft touch and spun-like texture.

〔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 electrical properties, and has uneven dyeing. It has many features such as being less likely to appear and having an excellent spun-like feel.

Note 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 the drawing]

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. . 1... High shrinkage multifilament yarn, 2... Low shrinkage synthetic fiber multifilament yarn, 3... Drawer kite, 4... First supply roller, 5... Turbulent flow nozzle, 6
...Second supply roller, 7...False twisting set heater, 8
. . . False twisting means, 9 . . . Take-up 90-ra, 10 . . . Winding bobbin. Patent applicant: Teijin Ltd. I2 Figure a

Claims (5)

[Claims] (1) A mixed fiber obtained by 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 it to false twisting. Bulky crimped yarn. (2) The copolymer is nylon 6 and nylon 6.
The mixed fiber bulky crimped yarn according to claim 1, which is a copolymer having a molar ratio i:o, os of 6 to 0.50. (3) The single fiber denier of the low shrinkage synthetic fiber multifilament yarn is 1. The mixed fiber bulky crimped yarn according to claim 1 or 2, which has an Ode or less. (4) Claim I, wherein the high shrinkage multifilament yarn is obtained by direct drawing or high speed spinning.
The mixed fiber bulky crimped yarn according to items nx to 3. (5) The mixed fiber bulky crimped yarn according to any one of claims 1 to 4, wherein the low-shrinkage synthetic fiber multifilament yarn is obtained by direct drawing or high-speed spinning.