JPS6257730B2 - - Google Patents

Description

[Detailed description of the invention]

In the present invention, a multifilament with a single yarn of 2.0 denier (hereinafter abbreviated as DR) or more serves as a core yarn, and a single yarn
This relates to a bulky processed yarn whose outer surface is covered with ultra-fine multifilaments of 1.5 dr or less, and its manufacturing method.By using this processed yarn, it is possible to achieve a soft texture, appropriate repulsion (firmness, waist), and bulkiness. The aim is to provide fabrics with unprecedented high added value that have the same properties as before. Conventional technology uses the [η] difference of polymers, spinning speed difference, denier difference of fibers, tension difference, and heat shrinkage difference to create a core-sheath structure by twisting, false twisting, air entanglement, etc.
Layered covering yarns are known, but each of these has a single yarn of 1.5 dr or more, and as in the present invention, by simultaneous false twisting of ultra-fine yarn and thick dr, covering yarn of ultra-fine fibers and softness thereof can be obtained. It is not known that a product with adequate repellency can be obtained. On the other hand, if only ultra-fine yarn of 1.5 dr or less is false-twisted, process passability such as thread breakage will be poor, and the resulting product will have a soft touch but lack firmness and stiffness. Also, JP 48-23968 and JP 52-
As seen in 18968, the single yarn has a fine dr of less than 1.0 dr.
False twisted fibers with a thick dr of 1.0 dr or more are also known, but these do not have a two-layer structure and have the problem of loss of flexibility. Furthermore, as in Japanese Patent Application Laid-Open No. 53-86875, there is also a method of making a two-layer structured yarn by blending 0.01 to 1.5 dr ultra-fine yarn and high shrinkage yarn, and constructing a fabric using this fiber, raising it, and heat-treating it. However, the core thread is untwisted, resulting in a product with less repulsion (firmness, stiffness). Based on the above background, in order to obtain a fabric with a flexible touch, appropriate repulsion properties, and bulkiness, the present inventors first twisted a single yarn with a thick drench to make a core yarn, and We thought that it was necessary to obtain a two-layer processed yarn with a covering (sheath) of ultra-fine yarn, and as a result of intensive research on this point, we found that single yarns with multifilaments of 2.0 dr or more and tips with 100 to 1000 T/M. After twisting, it is simultaneously false-twisted with a multifilament of 1.5 dr or less, and the direction of false-twisting is opposite to the first twisting direction (untwisting direction) on the false-twisting heater, which is not seen in the past. It has been found that the processed yarn of the present invention can be obtained. Although it is known to simultaneously false-twist fibers with different Δn as disclosed in Japanese Patent Application Laid-open No. 52-27823, the present invention is the first to simultaneously false-twist fibers with different Δn of thick denier and ultra-fine yarn of 1.5 dr or less. discovered a method to obtain a soft and stiff two-layer textured yarn. That is, the main constituent elements of the ultrafine fiber covering yarn of the present invention and the method for producing the same are as follows. 1 A thermoplastic multifilament (A) with a single yarn denier of 2.0 or more and a twist of 100 to 1000 T/M serves as the core yarn, and the outside of the filament (A) is covered with an ultrafine multifilament (B) with a single yarn of 1.5 denier or less. (covering) A covering yarn made of ultrafine fibers with bulk. 2 A multifilament (A) made of thermoplastic synthetic fiber with a single yarn of 2.0 dr or more is first twisted (pre-twisted) at 100 to 1000 T/M, and then the first twisted filament (A) and a single yarn with a single yarn of 1.5 dr or less are twisted. twisted or filament
When simultaneously false-twisting (A) and multifilament (B) which has a twist less than 100T/M in the same twisting direction, they are fused together on the false-twisting heater in the opposite direction (untwisting direction) to the previous twisting direction. A method for producing a covering yarn of ultrafine fibers, which is characterized by false twisting at a temperature below. The thermoplastic synthetic fibers referred to in the present invention refer to polyester-based, polyamide-based, polyacrylonitrile-based, and polyvinyl-based fibers, including those copolymerized with modifying components, matting agents, heat stabilizers, pigments, and control materials. It also includes those to which electrical property improvers, flame retardant improvers, etc. are added. In particular, polyester in which 80% or more of the repeating units are polyethylene terephthalate is preferable in terms of product properties, and the filament
(A) and B may be the same or different types, or may be composed of two or more types of polymers. The main method for obtaining the ultrafine fibers with a single yarn of 1.5 dr or less used in the present invention is as follows. 1 Flash method - Explosive ejection from the spinning nozzle 2 Super draw method - Low-temperature, high-magnification stretching without orientation 3 Chip blend or multi-core core-to-sheath spinning method - Removal of sea components with sea-island structure fibers 4 Split method - Composite of two or more components Dividing fibers by mechanical or chemical treatment 5 Direct spinning method - Obtaining ultrafine yarns directly by ordinary spinning The present invention has ultrafine yarns with circular or irregular cross sections by direct spinning as shown in Figures 1 to 4. Ultrafine yarns obtained by any of the above methods, such as sea-island structure fibers and splittable fibers as shown in FIGS. do not have. In FIGS. 1 to 8, the shaded areas are ultrafine fibers, but in particular, in FIGS. 5 and 7 to 8, areas other than the shaded areas can also be used as ultrafine fibers. In order to impart appropriate repulsion and bulkiness to the fabric, the filament (A), which is the core yarn, must be a single yarn of 2.0 dr or more, preferably 3 to 8 dr, and twisted at 100 to 1000 T/M, and must be pre-twisted. It is necessary to false twist it.
When the number of twists is less than 100 T/M, the difference in yarn length between filaments (A) and (B) is small, and a complete two-layer structure is not formed, resulting in a decrease in repulsion. On the other hand, if it exceeds 1000 T/M, it is unsuitable because it increases the cost and causes poor operability of false twisting. In terms of flexibility, the filament (B), which is a sheath yarn, has a drency of 1.5 dr or less, preferably 1.0 dr or less, and more preferably 0.3 to 0.8 dr, and in order to cover the core yarn (create a difference in yarn length) during false twisting. Must be untwisted or have less twist than the core yarn by 100T/M or more in the same twist direction as the core yarn. In addition, as a method for obtaining a two-layer core-sheath structure, there is a method in which fibers having different birefringence (Δn) (having different elongation) are simultaneously false-twisted due to differences in spinning speed, etc., but the features of the present invention In order to achieve this, the birefringence of filaments (A) and (B) before false twisting must be adjusted by
When n _A and Δn _B , Δn(A) − ΔnB is 10×
It must be 10 ^-3 or more, preferably 20×10 ^-3 to 50×10 ³ , and the filament (A) should be 100 to
Must have a pre-twist of 1000T/M. Especially Δn
If _A and Δn _B are 70×10 ^-3 or less, Δn _A −Δn _B
If it is less than 10×10 ^-3 , a sufficient yarn length difference cannot be obtained. In addition, in order to improve repulsion, process passability, etc., filament (A) and filament (B) with a twist number difference of 100T/M or more are twisted in the same direction as filament (A) and 900T/M or less before false twisting. In the present invention, there is no problem in the present invention. Furthermore, it is possible to perform twisting (additional twisting) after false twisting to improve process passability and fiber blending, but due to bulkiness, yarn length difference, etc. It must be in the opposite direction to the first twist and must be less than 300T/M. The false twisting direction is opposite to the first twisting direction (untwisting direction) of the filament (A) on the false twisting heater.
False twisting is preferred; in the positive direction (twisting direction), yarn separation (separation) of the core yarn and sheath yarn occurs, resulting in poor passability in subsequent processes and making it difficult to form a two-layer structure. Further, the false twisting temperature is preferably lower than the fusion temperature of filaments (A) and (B), and when fusion occurs, flexibility and bulkiness decrease. In addition, the false twisting method requires two
A stage heater set may also be used. Examples of schematic cross-sectional and side views of the ultrafine fiber covering yarn obtained by the present invention are shown in FIGS. 9 and 10.
As shown in the figure, the thick fibers in the center part in Figure 9 are core yarn aggregates with a single yarn denier of 2.0 or more,
The thick fibers at the center in FIG. 10 are also core yarn aggregates. A schematic diagram of an example of the false twisting operation is shown in FIG.
(A) and (B) are heaters (1) after passing through the first roller _R1.
After passing through H and being falsely twisted by a spinner S, it is wound up by a winding machine W via a second roller _R2 . The covering yarn of the present invention can be further twisted or twisted with other fibers as necessary to form fabrics such as knitted fabrics, woven fabrics, and nonwoven fabrics by conventional methods. Although some other fibers may be used when constructing the fabric, it is more preferable that the processed yarn according to the present invention covers the surface of the fabric. The knitted fabrics referred to in the present invention include all knitted fabrics, such as those with a flat surface, those with raised naps such as loops, and those with ridges and wrinkles, and those that are fluffed by buffing and/or needle cloth raising. Also included are napped knitted fabrics. The knitted fabric obtained using the yarn of the present invention has ultrafine yarns of 1.5 dr or less on the surface and has a soft slimy feel.
In addition, the thick dr of 2.0 dr or more has improved repellency and bulk through twisting and false twisting, making it a high value-added product never seen before. In addition, napped knitted fabrics in which the knitted fabrics are further subjected to buffing and/or needle cloth raising to fluff ultrafine yarns of 1.5 dr or less on the surface are highly effective due to the effects of the yarn of the present invention, and are of high quality. It has become a fall/winter material. The present invention will be specifically explained below using Examples. Example 1 and Comparative Examples 1 and 2 [η] = 0.65 dl/g (Intrinsic viscosity measured using an Utsperohde viscometer in a constant temperature bath at 30°C using a mixed solvent of equal amounts of phenol and tetrachloroethane)
A 100 dr/20 f multifilament (A) made by spinning and drawing polyethylene terephthalate (0.65 dl/g) by a conventional method is subjected to S twist of 500 T/M, and then the filament (A) and [η] = 0.69 dl /g of polyethylene terephthalate after direct spinning and stretching.
A processed yarn was obtained by simultaneously false-twisting 50 dr/72 f non-twisted ultrafine multifilament (B). The false twisting conditions are as shown in Figure 11, with an overfeed rate of 1.
%, heater temperature: 220℃, spinner: 240000rpm in Z direction (untwisting direction), winding speed: 100m/
It was min. Next, the two processed yarns are combined and subjected to 150T/M Z-twist and additional twist to form a fabric with a 1/1 flat texture in both the warp and weft, and is then relaxed and dyed to create a light texture on the front and back of the fabric. The needle cloth is brushed. In addition, Comparative Example 1 was carried out when the filament (A) was not pre-twisted but simultaneously false-twisted, and Comparative Example 2 when 50 dr/24 f (single yarn 2.08 dr) was used for the filament (B). The same textile processing as in Example 1 was carried out. The results of these physical property evaluations are shown in Table 1, and the following was found.

[Table] As is clear from this result, the processed yarn obtained in Example 1 has a yarn length difference of 10.2 between filaments (A) and (B).
%, it had a complete two-layer structure as shown in FIGS. 9 and 10. In addition, as is clear from the cantilever value of the fabric using this thread, it has a moderate hardness, has good wrinkle resistance of 75% or more, has firmness and elasticity, and has high compression and recovery rates and is bulky. It was highly repellent. In addition, the single yarn 0.69 dr covered the surface of the fabric and had a soft touch, resulting in an unprecedented etamine-like fabric. On the other hand, in Comparative Example 1, the filament (A) was not first twisted, so the yarn length difference was as low as 0.5%, and the thick drier
Some of the core threads came out outside, resulting in a woven fabric that lacked flexibility. In addition, Comparative Example 2 is a filament (B)
Because the single yarn denier is as thick as 2.08, the fabric is rough and stiff even though it has a two-layer structure. Example 2 Polyester 50dr/24f for filament (A)
Using 300T/M S twist, the filament (B) has the 7th
Non-twisted 50dr/12f nylon 6-polyester with cross section as shown in the figure (11 divisions, single yarn 0.3-0.4dr)
Both fibers were twisted together at 200T/M S twist using the following method, and then false twisted under the following conditions. Overfeed: 1%, heater: 170℃,
Spinner: 260000rpm in Z direction Winding: 100m/min. Next, the processed yarn was used as a front yarn to form a high shrinkage polyester filament with a hot water shrinkage rate of 25%.
A 28G single tricot knit was constructed with a 1/2 half weave using 75dr/32f as the back yarn. Thereafter, the back yarns were sufficiently shrunk by relaxing (hot water treatment) and dyeing with an acid dye to make the front yarns stand out on the surface of the knitted fabric, and light buffing was performed. In the processed yarn of the present invention, the filament (A) is covered by the filament (B), and the nylon 6 and polyester of the filament (B) are divided into ultra-fine fibers by false twisting, and the resulting tricot knit has a soft surface touch and repulsion. It has become a high value-added product with marbled texture and drapability. Example 3 [η]=0.70dl/g polyester for 2500m/
At a spinning speed of min, the winding birefringence (Δn) is 37×
A 218dr/32f filament (A) of 10 ^-3 was obtained. On the other hand, [η] = 0.62 dl/g polyester per 1000 m/
A filament (B) of 62 dr/36 f with a winding Δn of 6×10 ⁻³ was obtained at a spinning speed of min. Then the filament
(A) was subjected to S twist of 150T/M, two filaments (B) were aligned, and simultaneous false twisting was performed under the following conditions. Stretching ratio: 2.0x, heater: 180℃, spinner: 330000rpm in Z direction, winding: 150m/
min. The obtained processed yarn has a two-layer structure in which the filament (A) is the core yarn and the filament (B) is the sheath yarn due to the difference in Δn (difference in elongation) and the difference in the number of twists, and fusion does not occur. I wasn't there. The processed yarn is made into a weft yarn, 150dr/48f
A woven fabric was prepared with a 1/2 twill structure using the processed polyester yarn of 1.0 as the warp yarn. The resulting fabric has a flexible texture and a moderate waist, and has become a high-quality autumn/winter material. Example 4 75dr/24f-800T/M as filament (A)
Using S-twist nylon 6 multifilament, the filament (B) is sea-island structure fiber 83dr/12f (sea component: 10% polyethylene,
Island component: 90% nylon, island denier: 1.0 dr x 2
(4 pieces + 0.7 dr x 4 pieces + 0.3 dr x 4 pieces) were simultaneously false-twisted in the Z direction at 175°C using ultrafine fibers 75 dr/120 f extracted with perclene and subjected to S twist of 200 T/M. Next, the false twisted yarn is used as a pile yarn,
A 28G pile circular knit with a pile length (sinker length) of 2.4 m/m was constructed using 50 dr/24 f nylon 6 processed yarn as the ground yarn, and then dyed and set. The resulting pile knit has a soft texture, and the pile has appropriate repellency, making it a high value-added product with little pile disorder. Example 5 The filament (A) is a spun mixed polyester yarn with different [η] of five-lobed cross section and three-lobed cross section of 75 dr/24 f.
Using 300T/M S twist, a non-twisted filament (B) having the cross section shown in Figure 8 (the shaded area is polyester, the white area is polyester copolymerized with 5.0 mol% sodium sulfonate of dimethyl isophthalic acid) Using polyester fiber 100dr/72f
Simultaneous false twisting was carried out in the Z direction at 200°C. Next, the false twisted yarn was subjected to a Z twist of 250T/M and used as a pile yarn,
After constructing a 28G pile circular knit with a 1.2m/m pile length using 75dr/24f polyester processed yarn as the ground yarn, it was treated with a 30g/l caustic soda aqueous solution to determine the cross section of the filament (B) due to the difference in decomposition rate. was divided into ultra-fine parts. After that, I dyed it and fluffed the surface with a wire brush, and the ultra-fine threads covered the surface. This product has achieved the effects of the present invention.

[Brief explanation of the drawing]

Figures 1 to 4 show an example of a sea-island structure fiber cross section, where the shaded area represents the island component and the white area represents the sea component.
The island component may be of a different type or may be a polymer of two or more types.
FIGS. 5 to 8 show an example of a cross section of a splittable composite fiber, and the shaded areas and white areas indicate different types of polymers having poor mutual affinity. FIGS. 9 and 10 are schematic cross-sectional and side views of a covering yarn made of ultrafine fibers obtained according to the present invention. FIG. 11 is a schematic diagram of an example of the false twisting operation used in the present invention.

Claims (1)

[Claims] 1. A thermoplastic multifilament (A) having a single yarn denier of 2.0 or more and a twist of 100 to 1000 times/meter (T/M) serves as a core yarn, and the outside of the filament (A) is a single yarn. A covering yarn made of ultrafine fibers that has bulk and is made by covering with ultrafine multifilaments (B) of 1.5 denier or less. 2. In the preceding item, the covering yarn is an ultrafine fiber in which the filament (A) and/or the filament (B) are made of two or more types of polymers. 3 100 to 1000 T/M to multifilament (A) of 2.0 denier or more single yarn made of thermoplastic synthetic fiber
The first twisted filament (A) is then untwisted with a single yarn of 1.5 denier or less, or the multifilament (B) has a twist less than 100 T/M in the same twist direction as the filament (A). A method for producing a covering yarn of ultrafine fibers, which comprises false-twisting the fibers on a false-twisting heater in a direction opposite to the first twisting direction (untwisting direction) and at a temperature below the fusion temperature. 4. The method for producing a covering yarn of ultrafine fibers as set forth in the preceding paragraph, characterized in that the filament (A) and the filament (B) are twisted together in the same twisting direction as the filament (A) and at 900 T/M or less before false twisting. 5. A method for producing a covering yarn of ultrafine fibers according to claims 3 to 4, characterized in that the filament (A) and/or the filament (B) are composed of two or more types of polymers. 6 In claims 3 to 5, the birefringence of filaments (A) and (B) before false twisting is defined as Δn _A
and Δn _B , the difference between the two (Δn _A −Δn
_B ) A method for producing a covering yarn of ultrafine fibers, characterized by using a filament having a value of 10×10 ^-3 or more. 7. A method for producing a covering yarn of ultrafine fibers according to claims 3 to 6, characterized in that after false twisting, additional twisting is performed at 300 T/M or less in the opposite direction to the first twisting direction of the filament (A).