JPS6221886B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention uses at least two or more types of filament yarns to produce a slub-tuned yarn that alternately has bulky and soft thick yarn portions and thin yarn portions, like the original slub yarn made by the spinning method. Regarding the method. Conventionally, various attempts have been made to obtain slub-like textured yarns using filament yarns.
For example, Special Publication No. 50-35147, Special Publication No. 45-16895
Many composite temporary twisting methods using two or more types of filament yarns have been proposed, such as those disclosed in Japanese Patent Publication No. 43-28258. The compound temporary twist method involves winding the sheath yarn intermittently around the core yarn in the temporary twist area, or creating knots by wrapping and squeezing the yarn, and requires a high number of twists in the temporary twist area. Therefore, there is a limit to high-speed yarn processing. In addition, the sheath yarn is simply wrapped around the core yarn, and if you try to wind the sheath yarn loosely to obtain soft knots, the knots will move, resulting in poor handling of the processed yarn and poor knitting and weaving properties. To avoid these disadvantages, it is necessary to tightly wrap the sheath yarn around the core yarn to form a hard knot. Therefore, it is not possible to obtain bulky and soft knots, such as those obtained by wrapping spun rovings, which the original slub yarn obtained by the spinning method has. The purpose of the present invention is to improve the drawbacks of the conventional methods of manufacturing slub-like textured yarn using filament yarn, and to further improve the ease of handling and knitting and weaving by having bulky and soft knots that could not be achieved by those methods. It is an object of the present invention to provide a novel method for producing a variable yarn with a good slub texture, which makes it possible to obtain a yarn with a good slab texture at high speed and at low cost. In order to achieve such an object, the present invention has the following configuration. That is, the present invention uses two or more types of filament yarns and supplies them while providing a substantial yarn length difference between at least one type of filament yarn constituting the core component and other filament yarns constituting the sheath component. The yarn length difference is partially reduced by guiding the combined yarns to a fluid treatment device that has both the ability to impart straining action, the ability to impart weak swirling properties, and the ability to impart entanglement. This is a method for manufacturing a variable yarn characterized by forming thick yarn portions and thin yarn portions that are absorbed by the yarn alternately in the longitudinal direction of the yarn. Here, the yarn length difference means, for example, when processing with a device such as that shown in FIG.
4, the surface speed of the feed roller 35 of the sheath component yarn _is V ₁ m/min, the surface speed of the relaxation roller 43 is Vm/min, and the shrinkage rate of the core component yarn in the heating element 36 is ΔS. As a percentage, it is a value calculated using the following formula. However, the shrinkage rate ΔS% of the core component yarn is ΔS (%) when processed under the condition that all the slack L given by the surface speed difference between the feed roller 34 and the relaxation roller 43 of the core component yarn is shrunk by the heating element 36.
Calculate as =V ₁ -V/V×100. ΔS% in the case of processing under the condition that a part of the slack amount L is contracted by the heating element 36 is calculated by applying only the core component yarn without using the temporary twisting device 37 and the fluid treatment device 41 in advance, and The surface speed of the feed roller 34 is fixed at the processing condition of V ₁ m/min, and the surface speed of the relaxation roller 43 is changed so that the running yarn between the feed roller 34 and the relaxation roller 43 is contracted by the heating element. Find the limit surface speed V ₀ m/min of the relaxation roller 43 that runs without slack, and calculate Δ
It was calculated as S (%)=V ₁ −V ₀ /V×100. Next, the present invention will be explained with reference to the drawings. The present invention can be implemented using, for example, the following apparatus. FIG. 1 shows an embodiment in which a thermoplastic synthetic fiber undrawn filament yarn is used to obtain a variable yarn in succession with the drawing process, in which feed rollers 3, 4 and drawing heating elements 5, 6 are used. It is also possible to use a normal drawn filament yarn instead of the undrawn filament yarns 1 and 2.
This case will be explained. In FIG. 1, drawn filament yarns are used instead of undrawn filament yarns 1 and 2 and are directly fed to drawing rollers 7 and 8. The surface speed of the drawing rollers 7 and 8 is set so that the roller 7 that supplies the core component yarn is lower than the roller 8 that supplies the sheath component yarn, and the surface speed of the rollers 7, 8 and the relaxation roller 14 is lower than the surface speed of the roller 7. While giving a supply speed difference between the core component yarn and the sheath component yarn, and giving a substantial yarn length difference between the core component yarn and the sheath component yarn, the fluid treatment device 12 applies squeezing action, weak swirling action, and intertwining action to The yarn is made into a yarn having alternating tall and soft thick yarn portions 13, and is wound into a package 1 by a winding device 15.
By winding the yarn into yarn 6, the yarn of the present invention is obtained. That is, in the method of the present invention, the fluid treatment device 12 has three functions: the ability to impart a straining action, the ability to impart weak swirling properties, and the ability to impart entanglement to a yarn in which a core component yarn and a sheath component yarn are combined. It is configured and used. The squeezing action is
This can be achieved by providing a guide in front of the fluid treatment device and letting the running yarn lightly touch the guide while rotating, or by using a fluid treatment device that allows compressed air to flow in the opposite direction to the running direction. be able to. Here, the relationship between the swirling force and the entangling force of the fluid treatment device 12, the convergence effect of the sheath yarn, and the tension relationship between the core component yarn 10 and the sheath component yarn 11 are important. In order to create the bulky, soft, and thick yarn portion that is the objective of the present invention, a substantial yarn length difference is created between the sheath component yarn and the core component yarn, so that the sheath component yarn is larger than the core component yarn. By making the tension extremely low and further weakening the swirling force of the fluid treatment device, the sheath component yarn is folded extremely loosely around the core component yarn, or enters the fluid treatment device while being wrapped extremely loosely, allowing fluid squeezing, etc. The sheath threads converge and intertwine to form thick threads. That is, the thick yarn portion is formed by partially absorbing the yarn length difference. At this time, the constituent filaments are intertwined at least at both ends of the thick yarn portion, and a thick yarn portion that is bulky and soft but has little movement can be obtained. In addition, as a fluid processing device, a mixed fiber/entanglement nozzle having weak swirling properties and entangling properties is desirable.
It depends on the fineness of the yarn used, the required frequency of thick yarn sections, the tension of the running yarn, and the speed of the running yarn, but in terms of turning ability, even if the yarn is high before entering the fluid treatment device.
It is desirable to have a twist of 1000T/m or less. For example, when a slub-like textured yarn is manufactured using the composite twist method, when a twist number of approximately 2000 T/m or more is applied, the knots tend to become hard and tight, which is the intended aim of the present invention. It is generally difficult to obtain such bulky and soft knots.
Therefore, in the present invention, it is desirable to have a weak turning ability, and a high twisting speed is not required, so that high-speed machining can be easily achieved. As shown in Tables 1 and 2, the frequency of thick yarn portions can be changed depending on the difference in yarn length between the core component yarn and the sheath component yarn, and can be appropriately selected depending on the purpose for which the variable yarn is used. can do. However, in order to keep the tension of the sheath component yarn at an extremely low level with respect to the core component yarn and to stably obtain a bulky, soft, thick yarn section, at least the difference in yarn length between the core component yarn and the sheath component yarn must be maintained. It is preferable to add 2% or more, more preferably 5% or more.
In addition, if the yarn length difference is too high, the frequency of thick yarn parts will be too high and the thick yarn parts will be present on the entire surface of the knitted fabric.
It is preferable to keep it below 100%. Figure 2 shows the difference in yarn length between the core component yarn and the sheath component yarn by using a normal filament yarn and shrinking at least the filament yarn, which is to become the core component, with a heating element between the feed roller and the relaxation roller. An embodiment is shown in which a yarn is obtained while giving the following.
In FIG. 2, the filament yarns 17 and 18 are brought into a relaxed state between the feed roller 19 and the relaxation roller 27, and at least the core component yarn is heat-shrinked by the heating element 20, so that there is a gap between the core component yarn and the sheath component yarn. While giving a substantial yarn length difference, the fluid treatment device 25 applies a weak swirling action, a squeezing action, and an entangling action to produce a yarn having alternating thin yarn portions and thick yarn portions 26, and as the case may be. The yarn is heat-fixed by a heating element 28 between a relaxing roller 27 and a winding roller 29, and then wound around a winding package 31 by a winding device 30 to obtain a variable yarn according to the manufacturing method of the present invention. In this way, when a heating element is used to shrink at least the core component yarn to create a yarn length difference between the core component yarn and the sheath component yarn, at least the core component filament yarn has heat shrinkability. Of course, the process is simple, and by simply changing the surface speed difference between the feed roller and relaxation roller and the heat treatment conditions with the heating element, it is easy to create yarn length differences. It has the advantage that the degree of length difference can be easily changed, and the frequency of thick yarn portions can be easily varied. Furthermore, when at least the core component yarn is thermally shrunk with a heating element, it is more desirable to shrink it non-uniformly under low tension so that the heat of the heating element is not uniformly transmitted to the entire filament yarn. This is because the individual filaments of the core component yarn of the obtained variable yarn randomly have high shrinkage areas and low shrinkage areas due to uneven heat treatment, and there is also a shrinkage difference between the core component yarn and the sheath component yarn. When used in knitted fabrics, it has the ability to produce complex and random crimp.
A fabric with excellent drapability and aesthetics can be obtained, and at the same time, the bulky and soft thick yarn portion has the advantage of being less likely to move. Here, the temperature of the heating element is
The temperature may be any temperature that provides the necessary yarn length difference between the core component yarn and the sheath component yarn, and the yarn to be shrunk may be run in contact with the heating element or may be run in a non-contact manner. Figure 3 shows a process in which ordinary filament yarn is used, and at least the yarn that is to become the core component is temporarily twisted between the feed roller and the relaxation roller, and a difference in yarn length is given between the core component and the sheath component. An embodiment for obtaining yarn is shown. In FIG. 3, the filament yarns 32 and 33 are brought into a relaxed state between relaxing rollers 43, and at least the core component yarns are temporarily twisted by the twisting device 37 and shrunk by the heating element 36, thereby forming the core component yarn and the sheath component. A substantial yarn length difference is created between the yarn and the fluid treatment device 41 causes a slight swirling action.
A straining action and an entangling action are applied to form a yarn having alternating thin thread parts and thick thread parts 42, and the winding device 4
At step 4, the yarn is wound onto a winding package 45 to obtain a yarn according to the present invention. Here, the temporary twisting device is not particularly limited, but in order to facilitate thermal contraction by the heating element 36, it is desirable to use a fluid nozzle that has the ability to temporarily twist under low tension. Further, if it is desired to temporarily twist the yarn under high tension to impart high elasticity to the yarn, a surface speed difference may be provided between the feed rollers 34 and 35 to provide a substantial yarn length difference. Furthermore, if high elasticity is required for the yarn, instead of using a temporary twisting device, one or both of the filament yarns 32 and 33 to be supplied may be used with a yarn that has already been temporarily twisted, and the feed rollers 34 and 35 A substantial difference in yarn length may be provided by providing a surface velocity difference of . FIG. 4 is a model showing a typical side view of the yarn obtained by the manufacturing method of the present invention. A bulky and soft thick yarn part A, a thin yarn part B in which a core component yarn and a sheath component yarn are mixed, and a core component yarn and a sheath component yarn C in which the core component yarn and the sheath component yarn are mixed, intertwined and fixed at least at both ends of the thick yarn part. It is made up of. Conventional slub yarns made by intermittent winding of spun rovings have bulky and soft thick yarn parts, so when knitted into woven fabrics, they form elongated spindle-shaped or elongated cocoon-shaped knots, giving them a natural uneven feel. On the other hand, when a conventional filament yarn is made into a slub-like yarn using the composite temporary twist method, the thick yarn part is hard, so it takes on a prismatic or cylindrical shape in the knitted fabric, which is different from the original slub yarn using spun roving. has an extremely different appearance. In contrast,
According to the method of the present invention, the thick yarn part is bulky and soft at the knots shown in Figure 4, so it forms an elongated spindle shape or an elongated cocoon shape similar to the original slub yarn using spun roving in the knitted fabric. This results in a shantung-like appearance with a natural uneven feel. In addition, when the physical and chemical properties of the filament yarns used are different, for example, filament yarns with different dyeing behavior can be processed at the same time to create a unique appearance effect where the hue of the thick yarn and the hue of the thin yarn are different. You can also get a unique thread that can express. In other words, the present invention uses filament yarn, which is bulky and soft like the original spun roving yarn is wound intermittently, and has elongated spindle-shaped or elongated cocoon-shaped knots. Since the knots are fixed at the intertwined portions, there is almost no movement of the knots, and it is possible to produce slub-like textured yarns that can express a wide variety of appearance effects and are easy to handle at high speed, easily, and at low cost. be. When the material used in the present invention is heat-shrinked with a heating element to create a yarn length difference between the core component yarn and the sheath component yarn, at least one type of filament yarn constituting the core component is heated. The material must be heat-shrinkable with the body. However, in the case where a surface speed difference is provided between the feed roller and the relaxation roller, and a yarn length difference is provided between the core component yarn and the sheath component yarn, the yarn is not particularly limited as long as it is a filament yarn. Therefore, recycled fibers such as viscose rayon, semi-synthetic fibers such as acetate, polyester-based, polyamide-based, polyacrylonitrile-based, polyethylene-based, polypropylene-based, polyurethane-based, polyvinyl alcohol-based, polyvinylidene chloride-based, polyvinyl chloride-based Any synthetic fiber such as polyfluoroethylene or polyfluoroethylene may be used. Alternatively, a combination of two or more of these fibers may be used. There are no particular limitations on the cross-sectional shape, fineness, etc. Next, a more detailed explanation will be given using examples. Example 1 This was carried out using an apparatus as shown in FIG. Polyester 100 denier, 72 filament triangular cross section yarn (thread dry heat shrinkage rate 55% at 200℃ x 5 minutes) was used as core drawn yarn 17, polyester 100 denier, 72 filament triangular cross section yarn (thread dry at 200℃ x 5 minutes). Heat shrinkage rate
16%) was used for the drawn yarn 18 of the sheath component, and the drawn yarn 1
7, 18 is the feed roller 19 and surface speed
After being brought into a relaxed state between relaxing rollers 27 at a speed of 150 m/min, only the core component yarn 21 is made to run in contact with a heating element 20 at 210° C. to cause heat shrinkage, and treated simultaneously with the sheath component yarn in a fluid treatment device 25. The material was heat-fixed by contacting the heating element 28 at 130° C. for 200 mm between the relaxation roller 27 and the take-up roller 29 having the same surface speed, and then wound into a take-up package 31 by the take-up device 30. Here, by changing the surface speed of the feed roller 19 and the running yarn contact length with the heating element 20, the difference in yarn length between the core component yarn and the sheath component yarn is changed, and furthermore, the compressed air pressure applied to the fluid treatment device 25 is changed. Table 1 shows the workability when changing. In addition, the characteristics of the processed yarn and the obtained yarn are subjected to S twist of 150T/m to make the weft yarn.The warp is polyester 75 denier, 36 filament triangular cross section yarn is used, 92 yarns/in length and 43 yarns/inch Table 2 shows the appearance characteristics of the woven fabric which was made into a plain weave with a density of 1.5 in and then dyed and finished in the same manner as ordinary polyester woven fabrics. Considering the stability of processing, the shape of the knots obtained, etc.
It can be seen that it is desirable that the yarn length difference between the core component yarn and the sheath component yarn be 2% or more and the running yarn twist number be 1000 T/m or less.

【table】

【table】

[Table] Here, the fiber packing density of the thick yarn section is an index that expresses the bulkiness and softness of the thick yarn section. After removing the natural bends or weaving patterns, attach it to a transparent glass plate with adhesive tape, place another transparent glass plate on top of the thread, take an enlarged photo of the side of the thread, and measure the thickness of the thread. Find the outermost area of the projected side surface Scm ² of the area. Furthermore, the weight Wmg of the side surface area measurement part was determined, and the fiber packing density D was determined using the following formula. Fiber packing density D = W/S (mg/cm ² ) For reference, the fiber filling in the thick yarn part of the conventional slub yarn using spun roving determined by the above measurement method and the slub-like processed yarn obtained by the composite temporary twist method The density is 2 to 11 mg/cm ² for the spun roving method, and 13 to 25 mg/cm ² for the composite temporary twist method.
It was hot. In addition, the degree of entanglement of the fine yarn portion is an index representing the degree of mixing and intertwining of the filaments constituting the fine yarn portion. This is the value measured. Example 2 The experiment was carried out using an apparatus as shown in FIG. Undrawn yarn 1 is a 175.5 denier, 24 filament polyester round cross section yarn, undrawn yarn 2 is a 351 denier, 96 filament polyester triangular cross section yarn, and undrawn yarn 1, which is to be the core component, has a surface speed of
121m/min stretching roller 7 and feed roller 3
The undrawn yarn 2, which is to become a sheath component, is wound once around the drawing heating element 5 at 100°C and stretched 3.51 times. Wrap it once around the stretching heating element 6.
Stretch 3.51 times. Additionally, the surface speed is 120m/min.
Between the relaxation roller 14 and the drawing rollers 7 and 8, a fluid of 4.5 kg/cm ² is passed through a compressed air while giving a yarn length difference of about 14.2% between the core drawn yarn 10 and the sheath drawn yarn 11. A processing device 12 processes both component yarns simultaneously. Here, the tension of the core component yarn 10 is approximately 12 g/
The tension of the main and sheath component yarns 11 is 0.4 g/strand, and the running yarn twist number of the yarn before entering the fluid treatment device is 450 to 800 T/strand.
It was m. Further, the yarn was wound around a winding package 16 using a winding device 15 to obtain a yarn of the present invention. In the obtained yarn, the core component yarn and sheath component yarn form a mixed fiber state with an entanglement degree of 58 in the fine yarn portion, and a frequency of approximately 110 in the thick yarn portion.
fibers/100m, forming soft knots with a fiber packing density of 2.5 to 5.0 mg/ ^cm2 . In addition, the obtained thread
The same warp yarn as in Example 1 was wefted with a plain weave with a weft density of 50 threads/in, and then dyed and finished in the same manner as ordinary polyester fabrics. The fabric was of good quality and had the luster and feel of silk fabric. Furthermore, when the obtained yarn is cheese dyed, knitted into 36 circular knits, and subjected to the usual finishing process, it has soft slub or netp-like knots, and has a silk-like appearance and texture, making it a good yarn-dyed knit. was gotten. Example 3 Level E of Example 1 is the heating element 2 of the core component yarn 21.
The running yarn tension between the feed roller 19 and the heating element 20 with a contact length of 100 mm at zero and a surface speed of 177.3 m/min was 6 g/strand. Here, the contact length of the core component yarn with the heating body 20 is 50 mm, and the running yarn tension between the feed roller 19 and the heating body 20 is 0.7 g/strand.
The filament of the core component yarn was processed under the same conditions as Level E of Example 1, except that the filament of the core component yarn was shrunk by about 15.4% under the condition that the heat of the heating element 20 was not uniformly transmitted to the entire filament. Under this condition, the tension of the core component yarn between the fluid treatment device 25 and the guide 22 is approximately 13 g/strand, the tension of the sheath component yarn 24 is approximately 0.5 g/strand, and the tension of the core component yarn between the fluid treatment device 25 and the guide 22 is approximately 0.5 g/strand.
The number of running thread twists between 5 and guide 22 is approximately 400 ~
It was 800T/m. The obtained yarn formed soft knots with a degree of entanglement in the fine thread part of 85, a frequency of about 154 pieces/100m in the thick thread part, and a fiber packing density of 2 to 5.5 mg/ ^cm2 , and this knot was at the level of Example 1. Compared to E, it moved even less. Furthermore, when the threads of E level of Example 1 and the threads of Example 3 were treated as skeins in a dryer at 200°C for 5 minutes in a free state, the fine yarn portion of the thread of Example 3 was different from that of Example 1. Compared to the fine yarn part of the yarn of level E, complex, fine, and random crimp was developed. Furthermore, when the fabric of Example 3 was woven and dyed and finished under the same conditions as Level E of Example 1, the fabric of Example 3 had the same shape as the knots of the fabric of Level E of Example 1, but the fabric as a whole was bulkier. A fabric with good drapability and a deep hue was obtained. Example 4 This was carried out using an apparatus as shown in FIG. 50 denier, 24 denier as the drawn yarn 32 constituting the core component
A polyester yarn with a round cross section of filaments and a polyamide yarn with a round cross section of 70 denier and 68 filaments are used as the drawn yarn 33 constituting the sheath component. The core component yarn is fed by feed roller 3 with a surface speed of 112 m/min.
4 and Relax Roller 4 with a surface speed of 110m/min
The sheath component yarn is temporarily twisted by a fluid temporary twisting device 37 and a heating element 36 between 3, and the sheath component yarn is placed in a relaxed state (yarn length difference 17.3%) between a feed roller 35 with a surface speed of 129 m/min and a relaxing roller 43. The core component yarn and the sheath component yarn were treated at the same time in a fluid treatment device 41 through which a pressure of 5 kg/cm ² was passed, and then wound into a winding package 45 by a winding device 44. Here, the temperature of the heating body 36 is 210°C, the length is 1200 mm, and the fluid temporary twisting device 3
7 was passed through compressed air of 5 kg/cm ² . The obtained thread is
The degree of entanglement in the thin yarn part is 32, and the frequency in the thick yarn part is approximately 128 pieces/
The yarn formed soft knots with a length of 100 m and a fiber packing density of 3 to 6.5 mg/cm ² and had high elasticity in the fine yarn portion.
In addition, this yarn was wefted into the same warp yarn as in Example 1 in a plain weave with a weft density of 60 threads/in, and then finished by dyeing the polyamide yarn in red and the polyester yarn in white, and the entire fabric was heathered. A fabric with a neutral color, a knotty appearance similar to that of yarn-dyed roving wrapped around it, and a good texture with stretchability in the horizontal direction was obtained. Example 5 An experiment was carried out without using the temporary twisting device 37 and heating element 36 of the apparatus shown in FIG. The drawn yarn 32 that will be the core component is polyester 100 denier, 48 filaments, pentalobal cross-section temporary twisted yarn, and the drawn yarn 33 that will be the sheath component is viscose rayon 50 denier, 20 filaments and polyamide 50 denier, 48
It was used together with a filament. surface speed
Feed roller 34 with a surface speed of 160 m/min and feed roller 35 with a surface speed of 176 m/min and surface speed
The core component yarn and sheath component yarn are separated by a fluid treatment device 41 in which compressed air of 4.7 Kg/cm ² is passed through the sheath component yarn while relaxing the sheath component yarn by approximately 10% between relaxing rollers at 160 m/min (10% yarn length difference). were simultaneously processed and wound into a winding package 45 by a winding device 44. The obtained thread has a degree of entanglement in the fine thread part of 25 and a frequency of about 89 in the thick thread part.
The yarn formed soft knots with a fiber packing density of 3 to 6.5 mg/cm ² and a high elasticity in the fine yarn portion. This yarn was knitted into a jersey fabric, and the polyamide yarn was dyed yellow, the viscose rayon yarn was dyed red, and the polyester yarn was left white, resulting in soft slub or netp-like knots. A good quality knitted fabric was obtained using yarn-dyed roving yarn in a shantan style. Example 6 In Example 5, only the surface speed of the feed roller 35 on the sheath component side was changed, and the yarn length difference between the core component yarn and the sheath component yarn was 10, 20, 30, 50, 70, 90, 100,
It was carried out at 110 and 120%. It is possible to process almost stably up to a yarn length difference of 100%, but for yarn length differences of 110 and 120%,
The winding of the sheath yarn around the core yarn was unstable. Furthermore, after weaving these yarns as weft yarns into the same warp yarns under the same conditions as in Example 1, only the polyester was dyed and finished, the yarn length difference was 10 to 50%.
Fabrics using yarns in the range of 70% to 100% have a good slubby feel;
Although it is a fabric with a very high slab density, it has a relatively thick and thin feel, and fabrics using yarns in the range of 110 to 120% are so thick that they appear to have thick yarns on the entire surface of the fabric. It was hot. In other words, in order to obtain stability in yarn processing and a slab-like appearance, it is desirable that the yarn length difference between the core component yarn and the sheath component yarn be approximately 100% or less.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are schematic diagrams showing one embodiment of the manufacturing method of the variable yarn of the present invention, and Figure 4 is a model of typical aspects of the variable yarn obtained by the present invention. FIG. 1: undrawn yarn, 2: undrawn yarn, 3: feed roller, 4: feed roller, 5: stretched heating element,
6: Stretching heating body, 7: Stretching roller, 8: Stretching roller, 9: Guide, 10: Core component yarn, 11: Sheath component yarn, 12: Fluid processing device, 13: Thick yarn section, 14:
Relax roller, 15: winding device, 16: winding package, 17: drawn yarn, 18: drawn yarn,
19: Feed roller, 20: Heating body, 21: Core component yarn, 22: Guide, 23: Guide, 24: Sheath component yarn, 25: Fluid processing device, 26: Thick yarn section, 2
7: Relaxation roller, 28: Heating body, 29: Winding roller, 30: Winding device, 31: Winding package, 32: Stretched yarn, 33: Stretched yarn, 34:
Feed roller, 35: Feed roller, 36:
Heating body, 37: Temporary twisting device, 38: Core component yarn, 3
9: Guide, 40: Sheath component yarn, 41: Fluid treatment device, 42: Thick yarn section, 43: Relaxation roller, 4
4: Winding device, 45: Winding package, A:
Thick thread part, B: Thin thread part, C: Mixed fiber intertwining part at both ends of the thick thread part.

Claims (1)

[Claims] 1. Two or more types of filament yarns are used to provide a substantial difference in yarn length between at least one type of filament yarn constituting the core component and other filament yarns constituting the sheath component. The above-mentioned yarn length difference is reduced by feeding and combining the yarns, and then introducing the combined yarns to a fluid treatment device that has the ability to impart a straining effect, the ability to impart weak swirling properties, and the ability to impart entanglement, and subject them to fluid treatment. 1. A method for producing a variable yarn, characterized in that thick yarn parts and thin yarn parts formed by partially absorbing the yarn are formed alternately in the longitudinal direction of the yarn. 2. A patent claim characterized in that at least one type of filament yarn among two or more types of filament yarns that are fed and combined while giving a substantial difference in yarn length is configured to be combined while being temporarily twisted. A method for producing a special yarn according to item 1. 3. The means for providing a substantial yarn length difference is characterized in that at least one type of filament yarn is brought into contact with a heating element and contracted, thereby causing a yarn length difference with other filament yarns. A method for producing a yarn according to claim 1 or 2. 4. When at least one type of filament yarn is brought into contact with a heating body and contracted, the filament yarn is brought into contact with the heating body under low tension so that the heat of the heating body is not uniformly transmitted to the entire filament yarn. A method for producing a yarn as set forth in claim 3.