JPS622057B2 - - Google Patents

Description

[Detailed description of the invention]

B. Technical Field of the Invention The present invention relates to a method for producing a heat-shrinkable differentially mixed interwoven filament yarn suitable for producing a novel spun-like knitted fabric. B. Prior art and its problems Many methods for producing spun-like multifilament yarns that have the characteristics of both spun yarns and filament yarns have been devised in the past. Among them, as a technique similar to the present invention, there is, for example, Japanese Patent Publication No. 34-8969, which is generally called the Taslan method. In this method, all filaments are treated with fluid turbulence in a uniform and highly relaxed state to form loops and strong entanglements, giving them a spun yarn-like appearance and texture. However, in order to make all the filaments uniformly relaxed in the process of yarn processing, the relaxation rate must be at least as high as possible in order to provide strong entanglement and to make it difficult for the entanglements to slip out due to the tension when weaving and weaving using processed yarn. Must be 15% or more. Therefore, the obtained processed yarn has numerous loops protruding on the surface of the yarn, giving it a fluffy feel similar to spun yarn, but these loops make it difficult to unwind from the processed yarn wound layer and reduce the strength of the yarn. There is a disadvantage that not only the weaving properties are deteriorated, but also the surface quality of the knitted fabric is extremely deteriorated. In terms of texture, all the filaments shrink uniformly due to the heat treatment in the dyeing process, which reduces the dispersibility between filaments obtained by yarn processing, and reduces the roughness and volume. In addition, the loops on the surface of the yarn obtained through processing are extremely numerous and long, which is a fatal drawback in terms of the functionality of clothing fabrics.In other words, even if this yarn is made into a knitted fabric, loops will occur on the surface of the yarn, and these loops will overlap. are intertwined,
Since the so-called fastener phenomenon occurs, there are drawbacks such as spreading of the fabric during sewing, difficulty in fabric slipping, difficulty in slipping during wearing, and adhesion of dust. C. Purpose of the present invention An object of the present invention is to have a filament yarn that has the bulge and soft fluff characteristic of spun yarn, as well as the uniformity and fineness that are characteristic of filament yarn, and which can be used in high-order processing processes. It is an object of the present invention to provide a technology for rapidly and inexpensively producing a novel spun filament yarn that is easy to handle and can be used to create knitted fabrics that pose no problems when sewing or wearing clothing. D. Configuration of the present invention In order to achieve the above object, the present invention has the following configuration. That is, in the core-sheath type mixed fiber entangled yarn manufacturing method using multifilament yarn with two or more yarns, dry heat
A thermoplastic synthetic fiber multifilament yarn with a shrinkage rate of 8% or more after free-state treatment at 180°C for 5 minutes is used, and the sheath yarn is pre-treated at a temperature higher than the glass transition point of the yarn.
The nonuniformly heat-treated sheath yarn is made to run in contact with a heating element having a temperature below its melting point, and run for a time shorter than the time required for the heat from the heating element to be uniformly transmitted to the entire filament of the yarn, and the nonuniformly heat-treated sheath yarn is Dry heat of 180℃
×After the shrinkage rate after 5 minutes free state treatment is 6% or more lower than the shrinkage rate of the core yarn under the same conditions, the relaxation rate of the core yarn is 4% or less and the relaxation rate of the sheath yarn is 9% or less. This is a method for producing a spun yarn-like multifilament yarn, which is characterized by carrying out a blending and entangling treatment. The present invention will be explained in detail below. Spun yarn is fluff,
It has various characteristics such as bulkiness and natural unevenness. Among these, the bulkiness is particularly significant because the individual fibers have fine crimps and migrate to the inner layer and the outer layer. In the present invention, in a method for producing a core-sheath type heat-shrinkable differentially mixed fiber entangled yarn using two or more thermoplastic synthetic fiber multifilament yarns, the sheath yarns are subjected to non-uniform heat treatment in advance, and the core and sheath yarns are After giving a shrinkage difference between the yarns and a fine shrinkage difference in the filament axis direction of each sheath yarn, the dispersibility of the individual filaments can be improved by giving a yarn length difference to the core yarn and sheath yarn and intertwining them. It also gives fine crimping due to the difference in shrinkage, making it a filament yarn and giving it the bulkiness of a spun yarn.At the same time, it gives a fluffy feel and uneven thickness due to uneven bulge, making the yarn surface soft and similar to a spun yarn. It is possible to produce mixed fiber interlaced yarn with a natural uneven feel. Here, in order to achieve the object of the present invention, it is necessary to satisfy the requirements for creating yarn bulk in a knitted fabric using mixed fibers and interlaced yarns and exhibiting the fullness of a spun yarn knitted fabric. In this respect, for example, as shown in FIG. 1 based on the example below, the important point is how much the dry heat shrinkage difference between the core yarn and the sheath yarn should be set, and the thickness, which affects the degree of bulge of the fabric, is important. In terms of the increase rate, the dry heat shrinkage difference between the core yarn and sheath yarn is 180
6% or more, preferably 7% in free state treatment for 5 minutes at °C
It is necessary to set it to a higher value in order to obtain a stable and high bulge. In addition, the sheath yarn is subjected to non-uniform heat treatment to create minute shrinkage differences between individual filaments, and at the same time, the shrinkage difference between the sheath yarn and core yarn in a free state at dry heat of 180℃ for 5 minutes is set to 6% or more. In order to
The shrinkage rate of the thermoplastic synthetic fiber multifilament yarn used in the present invention under the same conditions must be 8% or more, preferably 9% or more. In the multifilament yarn used in the present invention, the sheath yarn is subjected to non-uniform heat treatment to give a shrinkage difference in the axial direction of each filament, so the multifilament yarn as a whole has a low shrinkage yarn, and the core yarn has a low shrinkage yarn. There are no particular restrictions on the yarn, as long as it shrinks by 6% or more in the free state under dry heat at 180°C for 5 minutes compared to the sheath yarn that has been made. vinylidene chloride,
Thermoplastic synthetic fiber multifilament yarns such as polyethylene, polypropylene, and polyurethane can be used alone or in combination. The present invention is also possible by combining two or more multifilament yarns in which the fineness of the single fibers is varied in the range of 0.5 to 6 deniers, and it is possible to produce yarn for knitting fabrics with more elasticity, but the surface texture is A combination in which the high fineness yarn is on the core yarn side is desirable from the viewpoint of appearance. In particular, from the perspective of appearance, fiber cross-sectional shapes, such as circular, triangular, five-lobed, eight-lobed, oblate, etc., and dyeing properties, such as disperse dyes, basic dyes, acid dyes, direct dyes, etc. By using a combination of fibers with different properties, it is possible to produce yarn for knitting and fabrics that exhibits even greater characteristics. In other words, a combination of different cross-sectional shapes gives a different gloss effect, and a combination of different dyeability gives a piece-dyed knitted fabric a marbling effect similar to that of a yarn-dyed knitted fabric. Another important point of the present invention is that when knitting and weaving using the mixed fiber yarn produced by the present invention, the high-order processability is good, the quality of the knitted fabric is improved, and the fabric does not cause the fastener phenomenon. need to be satisfied. In this respect, for example, as shown in Figure 2, the important point is how much the relaxation rate of the sheath yarn should be set. It is preferable to set the relaxation rate to be greater than or equal to the relaxation rate of the core yarn and less than or equal to 9%, preferably less than or equal to 8%. Here, the relaxation rate of the sheath yarn and the relaxation rate of the core yarn are important factors that determine the strength of the intertwining properties of the mixed fiber yarn produced according to the present invention and the strength of the total yarn. In general, in a yarn in which two multifilament yarns are mixed and intertwined in the same relaxation state, when the relaxation rate is lowered as in the present invention, a phenomenon called "sneak" occurs due to the high-order processing tension during weaving and weaving. The fiber entanglement property deteriorates, and the desired yarn quality and knitted fabric quality cannot be obtained. However, since the yarn produced in the present invention is a core-sheath structured yarn, even if it is subjected to tension during high-order processing such as weaving, knitting, and weaving, the core yarn side will mainly receive the tension, and there will be no slippage phenomenon and the intertwining property of mixed fibers will be reduced. Although it is not often done, it is desirable to give a slight relaxation rate to the core yarn side as well, in order to improve the fiber-mixing and entangling properties. However, the relaxation rate of this core yarn is
The purpose is to increase the interlacing properties of the two-filament multifilament yarn, and the content is 4% or less, preferably 3%.
The following are preferred. If the relaxation rate is higher than this, the same slippage phenomenon that occurs when two multifilament yarns are mixed and entangled in the same relaxation state tends to occur, and the biggest drawback is that the filaments of the core yarn become loose and entangled. As a whole thread,
A low-strength region occurs that is lower than the strength of the core yarn, resulting in yarn breakage in higher-order processing steps and a decrease in the tear strength of the knitted fabric. For this reason, it is preferable to use a multifilament yarn having a strength higher than that of the sheath yarn as the core yarn, and the fineness of the core yarn is preferably 20% or more, preferably 30% or more of the total fineness. Here, the relaxation rate of the core yarn and the relaxation rate of the sheath yarn are values determined by the following formula. Relaxation rate of core yarn (%) = R ₃ − R ₄ /R ₄ ×100 Relaxation rate of sheath yarn (%) = R ₂ −R ₄ /R ₄ ×100 R ₂ : Feeding speed of sheath yarn when mixed fibers are entangled R ₃ : Feeding speed when the core yarn is mixed and entangled R ₄ : Pick-up speed after the core and sheath fibers are mixed and entangled As described in detail above, the important point of the present invention is that the loops protruding from the yarn surface are A heat-shrinkable blended fiber that does not exhibit the fastener phenomenon that occurs when the fibers are used, and that provides a fluffy effect due to the difference in yarn length due to the difference in heat shrinkage between the core yarn and sheath yarn and the difference in heat shrinkage in the yarn axis direction of the individual filaments of the sheath yarn. Regarding the manufacturing method of intertwined yarn, the slack of the sheath yarn obtained by heat treatment in the dyeing and finishing process of knitted fabrics has different properties from the loops and slack created by yarn processing. Within the relaxation rate of the core yarn and sheath yarn within the scope of the claims, even if the dry heat shrinkage difference is set high, the fastener phenomenon in the knitted fabric hardly becomes a problem. In other words, in the conventional Taslan method,
While the entire multifilament yarn is treated with fluid turbulence in a uniformly relaxed state to obtain a spun yarn-like appearance and texture, in the present invention, two or more multifilament yarns are arranged in a core-sheath. The relaxation rate of the core yarn is made as low as possible, the relaxation rate of the sheath yarn is made higher than that of the core yarn, and the relaxation rate of the core yarn and sheath yarn is suppressed as much as possible. After applying non-uniform heat treatment to the sheath yarns to obtain length differences and heat shrinkage differences in the filament axis direction of each sheath yarn, the sheath yarns are made into mixed fibers and intertwined yarns, resulting in a fine and delicate spun yarn-like appearance. This gives it a unique texture. In this case, in addition to the heat shrinkage difference between the core yarn and the sheath yarn, uneven heat treatment of the individual filaments of the sheath yarn in the yarn axis direction can reduce the bulkiness of the spun yarn, which is the purpose of the present application, as shown in FIG. This is particularly important in giving a sense of purpose. That is, FIG. 4 is a model showing the interlaced yarn A produced according to the present invention and the interlaced yarn B which has been subjected to dry heat treatment at 180° C. for 5 minutes in a free state to develop yarn bulk. In the figure, in the intertwined yarn A, a high-shrinkage core yarn 1 and low-shrinkage sheath yarns 2 and 4 are strongly intertwined at a core-sheath fiber intertwined portion 3 with a slight difference in yarn length. Here, the low shrinkage sheath yarns 2 and 4 have been subjected to non-uniform heat treatment in advance and are comprised of a normal low shrinkage section 2 and an extremely low shrinkage section 4 which has been further reduced in shrinkage. Therefore, when the interlaced yarn A is subjected to dry heat treatment, the core yarn undergoes high shrinkage, and the highly contracted core yarn 5, the normally low-shrinkage sheath yarn portion 6, and the extremely low-shrinkage sheath yarn portion 7 form a fabric similar to the interlaced yarn B. Fine crimping and higher bulkiness are exhibited, and furthermore, high bulky portions C and extremely high bulky portions D are obtained, and the spun yarn-like bulky uneven effect, which is the objective of the present application, is obtained. Furthermore, FIG. 5 is a schematic diagram showing an example of an apparatus used in the present invention. In the present invention, a device as shown in FIG. 5 is used, and at least two or more multifilament yarns are used to form a multifilament yarn 8 constituting a sheath yarn and a multifilament yarn 9 constituting a core yarn.
are supplied to feed rollers 10 and 11, respectively. The sheath yarn 8 is brought into contact with the heating element 12 between the feed roller 10 and the relaxation roller 13 for a time shorter than the time required for the heat from the heating element 12 to be uniformly transmitted to the filament, and subjected to non-uniform heat treatment. A shrinkage difference is given to the filament in the yarn axis direction, and the sheath yarn as a whole is made into a low shrinkage yarn. After the yarn is mixed and entangled together with the core yarn 9 through a fluid turbulence processing body 14, it is passed through a second relaxation roller 15 and then taken to a winding machine. 16
Wind it up onto the winding package 17. At this time, the relaxation rate of the core yarn between the feed roller 11 and the second relaxing roller 15 is 4% or less, and the relaxation rate of the sheath yarn between the relaxing roller 13 and the second relaxing roller 15 is 9% or less. Also, between the feed roller 10 and the relaxation roller 13 of the sheath yarn 8,
The heat treatment conditions using the heating element 12 are such that the shrinkage rate of the entire sheath yarn multifilament yarn in a dry state at 180°C for 5 minutes is lower than the shrinkage rate of the core yarn 19 under the same conditions by 6% or more. The filaments of the sheath yarn are brought into contact with the heating element 12 for a shorter period of time than the heat of the heating element 12 is uniformly transmitted to the filaments of the sheath yarn, and non-uniform heat treatment conditions are set such that each multifilament has a shrinkage difference in the yarn axis direction. There is a need. E Effects of the present invention The effects of the present invention are as follows. In other words, by subjecting the sheath yarn of a core-sheath type heat-shrinkable differentially interwoven yarn made of multifilament yarn of two or more yarns to non-uniform heat treatment in advance, the dry heat of the core yarn is 180% lower than that of the sheath yarn.
The shrinkage rate in the free state for 5 minutes at ℃ is higher than 6%, and the sheath yarn is non-uniformly heat treated, giving rise to shrinkage differences in the yarn axis direction of each filament. When exposed, each filament yarn has fine crimping, and while migrating to the inner and outer layers, differences in yarn length due to differences in heat shrinkage occur, resulting in a filament yarn with bulk, fluffiness, and natural unevenness. A mixed fiber entangled yarn that exhibits a spun yarn-like effect with a soft touch can be produced quickly and economically. Furthermore, the relaxation rate of the sheath thread is 9%.
As the following, loops and slack on the yarn surface are small for a mixed fiber entangled yarn, and the strength of the entire yarn is high, resulting in good unwinding properties from the interlaced thread winding layer, good knitting and weaving properties, and high A yarn with excellent handling properties in higher processing, such as less entanglement and shedding under tension during subsequent processing, can be obtained. In addition, since the loops and sag on the surface of the knitted fabric are small and few, it is easy for dust to adhere to the fastener phenomenon that occurs when loops and sag are entangled with each other, which was previously considered to be a fatal drawback of knitted fabrics using interlaced yarns. The problem is resolved. In addition, since the relaxation rate of the core yarn is less than 4%, the strength of the entire yarn is high for a mixed fiber entangled yarn, and because it does not generate local extremely low strength parts that are typical of interwoven yarns, it is difficult to cut the yarn in higher processing steps. Problems such as a decrease in tear strength of knitted fabric products do not occur. Next, the present invention will be explained with reference to Examples. Example 1 A 78 denier, 36 filament, so-called polyester drawn yarn with a triangular cross section obtained by melt spinning and drawing polyethylene terephthalate (dry heat at 180°C)
x 5 minutes, contraction rate in free state was 17.0%)
The experiment was carried out using an apparatus as shown in FIG.
In order to check the characteristic values of the sheath yarn in advance, first, the polyester drawn yarn is supplied only to the sheath yarn 8, and the polyester drawn yarn is placed between the feed roller 10 and the relaxing roller 13 with a surface speed of 214 m/min, and then heated to the heating element 12 in a relaxed state. The product was subjected to non-uniform heat treatment by contact running for a short time (0.03 seconds), and then wound into a take-up package 17 by a take-up machine 16 without using the fluid turbulence treatment body 14 and the second relaxation roller 15. Here, the temperature of the heating element 12 and the speed of the feed roller 10 are changed,
Dry heat at 180°C for 5 minutes, the shrinkage rates in the free state are 15.0, 11.8, 10.4, 9.3, 6.5, and 2.2%, respectively, and the difference in yarn length is 1.8, 4.2, 5.3, 6.1, 8.4, and 10.1%, respectively.
A total of 6 levels of nonuniform heat-treated low-shrinkage polyester yarns were obtained. Here, the yarn length difference is a characteristic value based on the following definition. That is, when a non-uniformly heat-treated low-shrinkage polyester yarn is further heat-treated, within a certain length range there is a difference in yarn length between the filaments, but over a certain length range, the yarn length difference between the filaments is It is extremely small compared to the yarn length difference mentioned above (indicating that it is nonuniform in microns and uniform in macroscopic terms). The sheath yarn of the present invention has such characteristics, and the difference in yarn length is determined by the following formula. Difference yarn length difference (%) = l ₅ - l ₅₀ l ₅ = sheath yarn under a load of 2 mg/d 5 cm of multifilament yarn was taken and carefully unwound with a disassembly needle.
Read the length of each filament on a scale and calculate the ratio (%) of the difference between the longest yarn length and the shortest yarn length to the shortest yarn length. l ₅₀ = sheath yarn under a load of 2 mg/d Take 50 cm of multifilament yarn, carefully unwrap it with a disassembly needle, read the length of each filament on a scale, and calculate the longest and shortest yarn lengths. The difference between
Ratio (%) to the shortest yarn length. Next, the drawn polyester yarn was fed as the core yarn 9 to a feed roller 11 with a surface speed of 202 m/min, and the drawn polyester yarn was used as the sheath yarn 8. Under the same conditions, the feed is fed through the feed roller 10 and the heating element 12 to the relaxation roller 13 with a surface speed of 214 m/min, and then to the second relaxation roller 13 with a surface speed of 200 m/min.
The core yarn and sheath yarn are mixed and entangled in the fluid turbulence treatment body 14 through which compressed air of 3 kg/cm ² is passed between the relaxation roller and the yarn, and the winding machine 16 winds the yarn into the winding package 17. As shown in Table 1, a total of six levels of threads A to F were obtained. There were no particular problems with the processability of the yarn. The six levels of yarn quality obtained are shown in Table 1, and the ability to develop yarn bulk is mainly related to the dry aberration between the core and sheath yarns. It has been found that it is sufficient to set the dry aberration of the yarn to 6% or more. In addition, two of the obtained 6-level yarns were aligned and twisted at 450 T/m in the S direction, and used for warp and weft yarns, with a density of 57 yarns/in in the vertical direction and 54 yarns/in in the horizontal direction.
It was made into a 2-twill weave and processed using the usual polyester dyeing method. There were no particular problems in weaving preparation, weaving, and dyeing processing. The characteristics of dyed fabrics are as shown in Table 1 and Figures 1 and 3. Similar to the bulk capacity of the yarn, the bulk capacity of the fabric (thickness increase rate of the fabric) depends on the core yarn of the processed yarn. In order to obtain stable high bulkiness, the dry aberration of the core yarn and sheath yarn should be 6% or more, and the dry aberration of the core yarn and sheath yarn can be Even when the bulk is increased, the fastener phenomenon, which is a problem in fabrics using mixed fibers and interlaced yarns, is hardly worsened. In addition, dyed fabrics using processed yarns with a dry aberration of 6.6% or more between the core and sheath yarns have a silky span-like fluff, uneven yarn thickness, soft texture, and mild luster. A certain texture effect was observed. Next, among the non-uniformly heat-treated low-shrinkage polyester yarns, a yarn with a shrinkage rate of 9.3% in a free state under dry heat at 180°C for 5 minutes was used as the sheath yarn 8, and the previously drawn polyester yarn was used as the core yarn. , sheath thread is Relax Roller 1
3, and the core yarn is fed to the feed roller 11 with a surface speed of 204 m/min, and the core yarn is fed with a surface speed of 200 m/min.
3Kg/min with the second relaxation roller 15
In this method, a core yarn and a sheath yarn are mixed and entangled in a fluid turbulence processing body 14 through which compressed air of cm ² is passed, and the yarn is wound around a winding package 17 in a winder 16 to obtain an entangled yarn. The surface velocity of 208,
212, 216, 218, 220, 222, 224, 228, 232,
13 conditions were changed to 236, 240, 244, and 248 m/min, and the relaxation rate of the core yarn was 2%, and the relaxation rate of the sheath yarn was 4, 6, 8, 9, 10, 11, 12, 14, respectively.
A total of 13 different levels of yarn were processed: 16, 18, 20, 22, and 24%. This processed yarn was twisted, warped, woven, and dyed under the same conditions as the woven fabric. The obtained dyed fabrics are all bulky fabrics, but as shown in Figure 2, when the relaxation rate of the sheath yarn is 9% or less, the fastener phenomenon of the fabric is hardly a problem. On the other hand, when the relaxation rate difference was 8% or more, the loops and slacks on the surface of the fabric became entangled to a large extent, resulting in a fastener phenomenon, which was not suitable for use as a fabric for clothing. Further, under the above processing conditions, the surface speed of the relaxation roller 13 on the sheath yarn side was fixed at 216 m/min (relaxation rate of the sheath yarn 8%), and only the surface speed of the relaxation roller 11 on the core yarn side was 202.2, 204.4, 206.1,
Seven conditions were changed: 208.0, 209.0, 210.4, 212.2 m/min, and the relaxation rate of the core thread was 1.1, 2.2, 3.1,
Seven levels of processing were performed: 4.0, 4.5, 5.2, and 6.1%. This processed yarn was tested using an Instron type strength and elongation tester.
The cutting strength was measured, and the average cutting strength of the 100 measurements and the average value of the 5 lowest strength values among the 100 measurements (the lowest strength of the processed yarn) were found.
The average cutting strength was 4.07, 4.06, 4.04, respectively.
3.94, 3.71, 3.60, 3.45g/d, minimum strength of processed yarn is 3.58, 3.60, 3.53, 3.40, 3.19, respectively.
It was 3.01 and 2.86 g/d. The cutting strength of the polyester multifilament yarn used for the core side was 4.95 g/d, and the cutting strength of the non-uniformly heat treated low shrinkage polyester multifilament yarn used for the sheath yarn side was 4.90 g/d. In other words, in order to suppress the decrease in strength of the obtained processed yarn as much as possible compared to the strength of the core yarn and sheath yarn used in the processing of the present invention, the relaxation rate of the core yarn must be set to 4 as shown in FIG. % or less, preferably 3% or less. Example 2 Using a device as shown in FIG.
%) 50 denier, 36 filament octave cross-section drawn yarn obtained by melt-spinning and drawing copolymerized polyester (dry heat at 180℃ x 5 minutes, shrinkage rate in free state
50 denier, 24 filament round cross-section yarn obtained by melt spinning polyethylene terephthalate as a core yarn (dry heat at 180℃ x 5 minutes, free (The shrinkage rate was 16.8%.) were respectively fed to feed roller 10 and feed roller 11 with a surface speed of 204 m/min. The sheath yarn is first passed between a feed roller 10 with a surface speed of 240 m/min and a relaxation roller 13 with a surface speed of 212 m/min.
At a relaxation rate of 13%, it is run in contact with a heating pin with a surface temperature of 180℃ with a contact length of 10cm, and after non-uniform heat treatment to reduce shrinkage, it is combined with the core yarn and the surface speed is 200℃.
m/min between the second relaxation roller 15,
Fluid turbulence processing body 14 that passes 3Kg/cm ² of compressed air
Then, the fibers were mixed and entangled, and wound around a winding package 17 using a winding machine 16 to obtain an interlaced yarn. The properties of the obtained yarn are: difference in dry heat shrinkage rate between core yarn and sheath yarn = 12.9%, relaxation rate of core yarn = 2%, relaxation rate of sheath yarn = 6
%, and the degree of bulk development of processed yarn was 51.5 cc/g.
Two of these threads are pulled together and twisted at 500T/m in the S direction, and used as warp and weft threads, resulting in 58 warp threads/in.
It was made into a plain weave with a density of 50 wefts/in, and only the sheath threads were dyed with basic dyes. There were no particular problems in weaving and dyeing. The dyed fabric has a woven fabric thickness increase rate of 32.5%, a fastener phenomenon of class 5, is full, has no fastener phenomenon, and has a marbling effect due to the color difference between the core and sheath yarns.
Due to the difference in single yarn fineness between the sheaths and the cross-sectional shape mix effect, a silky wool-like fabric with a soft surface touch and relatively high stiffness against bending was obtained.

【table】

【table】 [Brief explanation of the drawing]

FIGS. 1 and 3 are diagrams showing the relationship between yarn properties and fabric properties, including examples of interlaced yarns produced according to the present invention. FIG. 2 is a diagram showing the relationship between processing conditions including an example of the present invention and the characteristics of a fabric using the yarn. FIG. 4 is a model diagram showing the entangled yarn produced according to the present invention and the state in which the yarn is subjected to dry heat treatment to develop bulk. FIG. 5 is a schematic diagram showing an example of the manufacturing apparatus of the present invention. FIG. 6 is a diagram showing the relationship between processing conditions and yarn characteristics including examples of the present invention. 1: High shrinkage core yarn, 2: Normal low shrinkage sheath yarn, 3:
Core-sheath entangled part, 4: Very low shrinkage sheath thread, 5: Highly shrinkable core thread, 6: Normally low shrinkage sheath thread part, 7: Very low shrinkage sheath thread part, 8: Multi forming the sheath thread filament yarn, 9: multifilament yarn constituting core yarn, 10: feed roller, 11: feed roller, 12: heating element, 13: relaxation roller,
14: Fluid turbulence processing body, 15: Second relaxation roller, 16: Winding machine, 17: Winding package,
A: Yarn structure model, B: Thread structure model after bulk development, C: High bulk yarn structure model, D: Extremely high bulk yarn structure model.

Claims (1)

[Claims] 1 In the core-sheath type mixed fiber entangled yarn manufacturing method using multifilament yarn with two or more yarns, dry heat at 180℃
x A thermoplastic synthetic fiber multifilament yarn with a shrinkage rate of 8% or more after free-state treatment for 5 minutes is used, and the sheath yarn is run in advance in contact with a heating body whose temperature is above the glass transition point and below the melting point of the yarn, Non-uniform heat treatment is performed by running the yarn for a time shorter than the time required for the heat from the heating element to be uniformly transmitted to the entire filament of the yarn, and the non-uniform heat treated sheath yarn is subjected to dry heat treatment at 180°C for 5 minutes in a free state. After the shrinkage rate of the core yarn is 6% or more lower than the shrinkage rate of the core yarn under the same conditions, the fibers are mixed and entangled under the conditions that the core yarn's relaxation rate is 4% or less and the sheath yarn's relaxation rate is 9% or less. Characteristic method for producing spun yarn-like multifilament yarn.