JP2009209479A - Method and apparatus for melt-spinning combined filament yarn of modified shape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melt spinning method that produces a combined filament yarn of modified shape and modified fineness, having excellent spinning operability without causing loop and fluff, excellent passage of drawing and false twisting process and providing a fabric obtained by weaving or knitting with a dry feeling and a swelling feeling by high-speed spinning, and to provide a melt spinning apparatus therefor. <P>SOLUTION: The method for melt spinning a combined filament yarn of modified shape and modified fineness includes, when melt spinning a combined filament yarn of modified shape and modified fineness of irrotational symmetrical shape which contains a thick fineness filament group and a thin fineness filament group in which the ratio of the number of single filaments of the thick fineness filament group to the total combined filament yarn is 5-50%, the ratio of the number of single filaments of the thin fineness filament group is 20-70%, and the cross-sectional shape of a part or the whole of the thick fineness filament substantially has a straight flat trunk part and a projection part, cooling a thermoplastic filament group melt spun from the same spinneret 1 a ring-shaped cooling device 2, making the spun yarn flow down in a straightening cover 3 enclosing the spun yarn and satisfying a specific formula, providing the spun yarn with a finishing oil by an oiling device 4 satisfying a specific formula and taking off the spun yarn at a take-off speed of 2,500-4,000 m/minute. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a melt spinning method and a melt spinning apparatus for mixed yarns of different sizes and different finenesses, and more specifically, includes a group of thick yarns having a single yarn fineness of 3 dtex or more and a group of fine yarns having a single yarn fineness of 2 dtex or less, A uniform and different quality mixed yarn having a non-rotationally symmetric shape having a flat trunk portion and a protrusion having a substantially straight cross-section in part or all of the thick yarn is obtained with uniform quality and stability. The present invention relates to a melt spinning method and a melt spinning apparatus for an atypical and different fineness mixed yarn.

  Synthetic fibers such as polyester fibers and polyamide fibers are widely used as materials for woven fabrics, knitted fabrics, etc., but the dryness of woven and knitted fabrics is eliminated by removing the disadvantages of synthetic fibers such as sliminess, stickiness, and irritation. In order to give a feeling of swell, various attempts have been made to make the cross section of the single yarn different or to change the fineness of the single yarn.

  In the patent documents 1 to 4, the present applicant has also proposed various types of heterogeneous heterogeneity mixed yarns. These atypical and different fineness mixed yarns include a thick fine yarn group and a fine fine yarn group, and a flat trunk portion and a protrusion portion in which a part or all of the cross section of the thick fine yarn is substantially linear. Since they exhibit non-rotationally symmetric shapes, if they are knitted or woven, a knitted or knitted fabric having a drape or softness characteristic of natural silk, wool, etc., and also having a firmness, stiffness, and dryness is obtained. I can.

  Since these different-type different fineness mixed yarns are composed of thick and fine fine yarns having different shapes, in the manufacture of different-type different fineness mixed yarns using the same spinneret, a die having a plurality of spinning holes. When cooling the filament group discharged from the air stream with the air flow, the cooling time is short in the conventional cooling equipment, so that cooling spots are likely to occur between the single yarns. Therefore, in order to increase the productivity, the take-up speed is 2500 m / min or more. When high-speed spinning is performed, loops and fluff are generated in the cheese at a certain rate, and the spinning operability is lowered.

Furthermore, single yarn breakage and single yarn slack due to loops and fluff generated in cheese interfere with uniform drawing when stretching and false twisting in the subsequent process, resulting in partial thick spots on the single yarn. There was a problem in that the twisted tone was lowered, the fabric was knitted and dyed, and the dyed fabric was also partially dyed.
Japanese Patent Laid-Open No. 62-21827 JP 62-90345 A JP-A-62-156327 JP 2004-3051 A

  The present invention solves the above problems, has no loops and fluff, has good spinning operability, has good passability in the drawing false twisting process, and has a dry feeling on the fabric obtained by weaving and weaving. It is a technical object to provide a melt spinning method and a melt spinning apparatus for a heterogeneous heterogeneity mixed yarn that can be produced by high-speed spinning of a heterogeneous heterogeneity mixed yarn that can give a feeling of swelling and swelling. .

As a result of intensive studies to solve the above-mentioned problems, the inventor of the present invention, in melt-spinning the atypical and different fineness mixed yarn, the shape of the annular cooling device (length, diameter) and the shape of the rectifying cover (length, diameter)
By setting specific conditions for the distance to the oiling device, it becomes possible to suitably set and control the cooling conditions even when mixed yarns with various shapes and finenesses are mixed. As a result, it is possible to produce a heterogeneous heterogeneity mixed yarn that is free from loops and fluff and that can give a dry feeling and swell to a fabric obtained by weaving and weaving, stably under high-speed spinning with good operability. The headline, the present invention has been reached.

That is, the gist of the present invention is as follows.
(A) a fine yarn group having a single yarn fineness of 3 dtex or more and a fine yarn group having a single yarn fineness of 2 dtex or less, and the ratio of the number of single yarns of the thick yarn group to the whole mixed yarn is 5 to 50%, The ratio of the number of single yarns of the fine yarn group is 20 to 70%, and a part or all of the cross-sectional shape of the thick yarn has a non-rotationally symmetric shape having a substantially straight flat trunk portion and a protruding portion. When melt-spun an atypical heterogeneity mixed yarn composed of thermoplastic filament groups, the thermoplastic filament group melt-spun from the same spinneret is cooled by an annular cooling device, and then the spun yarn is surrounded and the following formula ( 1), after flowing down the rectifying cover satisfying (2), and then applying an oil agent with an oiling device satisfying the following formula (3), it is taken up at a take-up speed of 2500 to 4000 m / min. Melting of fine mixed yarn Thread method.

L ≧ A × 1.5 (1)
R ≧ B (2)
OR ≧ L + 100 (3)
L: Length of rectifying cover (mm)
R: Diameter when the rectifying cover is cylindrical, and in the case of a box type, the length (mm) of one side (short side) of a square or rectangle which is a cross section
A: Length of the annular cooling device (mm)
B: Diameter of the annular cooling device (mm)
OR: Distance from the upper end of the rectifying cover to the oiling device (mm)
(B) an apparatus for carrying out the melt spinning method of the heterogeneous and different fineness mixed yarn described in (a) above, along the running direction of the spun yarn below the spinneret, and an annular cooling device; Melting of mixed yarns of different sizes and different degrees, characterized in that a straightening cover surrounding the spun yarn and satisfying the above formulas (1) and (2) and an oiling device satisfying the above formula (3) are provided. Spinning device.

  According to the present invention, there is no generation of fuzz, loops, etc. under conditions of high spinning speed of 2500 m / min or higher, good passability in the drawing false twisting process, and the synthetic fiber is obtained by knitting and weaving. There are no dullness, stickiness, irritation, etc., which are the disadvantages of this product, and there are draping, softness, and swelling that are characteristic of natural silk and wool, etc. The present invention provides a melt spinning method and a melt spinning apparatus for an atypically different fineness blended yarn, which can stably produce the atypically different fineness blended yarn.

Hereinafter, the present invention will be described in detail.
The melt spinning method of the heterogeneous and different fineness mixed yarn of the present invention includes a thick yarn group having a single yarn fineness of 3 dtex or more and a fine yarn group having a single yarn fineness of 2 dtex or less, and a thick yarn group for the entire mixed yarn. The ratio of the number of single yarns is 5 to 50%, the proportion of the number of single yarns of the fine yarn group is 20 to 70%, and a part or all of the cross-sectional shape of the thick yarn is substantially straight. And a non-rotationally symmetric thermoplastic filament group having a non-rotationally symmetric shape and melt-spun under specific conditions described later.

  First, the thermoplastic polymer used in the present invention is not particularly limited as long as it has a fiber-forming ability, such as polyester and polyamide, and may be a mixture or copolymer of various polyesters. Polyethylene terephthalate polyester is particularly preferable.

  The thermoplastic polymer may be one obtained by adding various additives as secondary agents. Examples of secondary additives include heat stabilizers, pigments, UV absorbers, antioxidants, antibacterial agents, lubricants, antistatic agents, mold release agents, crystal nucleating agents, softening agents, light-resistant agents, interfaces Activators, plasticizers, surface modifiers, fragrances, dyes, flame retardants, matting agents, organic electrolytes and the like.

  The atypical heterogeneity mixed yarn produced in the present invention is a monolithic fine yarn group having a single yarn fineness of 3 dtex or more and a fine yarn group having a single yarn fineness of 2 dtex or less. The proportion of the single yarn of the fine yarn group is 5 to 50%, the proportion of the single yarn of the fine yarn group is 20 to 70%, and a part or all of the cross-sectional shape of the thick yarn is substantially linear. It is necessary to be composed of a thermoplastic filament group having a non-rotationally symmetric shape having a flat trunk portion and a projection portion. That is, the fabric obtained by knitting and weaving this mixed yarn exhibits a firmness, stiffness, or dry feeling due to the presence of the single yarn constituting the thick yarn group, and the single yarn constituting the fine yarn group. Due to the presence of the yarn, it can have a soft feeling, a bulging feeling, or a drape. The atypical and different fineness mixed yarn may contain a medium fineness yarn group having a single yarn fineness intermediate between the thick and fineness yarns.

  When the single yarn fineness of the thick yarn group is less than 3 dtex, the cross-sectional area of the single yarn is small, so that the repulsive force against the lateral force, bending and twisting applied to the single yarn is weak, the tension and stiffness are reduced, and the fine yarn Since there is little difference in the fineness, the knitted or knitted fabric with a feeling of unevenness is reduced, which is not preferable. Therefore, the single yarn fineness of the thick fine yarn group needs to be 3 dtex or more, and preferably 3.5 to 5.0 dtex. Further, in order to give softness and bulge feeling simultaneously with elasticity, stiffness, or dry feeling, the single yarn fineness of the fine yarn group needs to be 2 dtex or less, and preferably 1.2 to 1.7 dtex. . If the single yarn fineness of the fine yarn group exceeds 2 dtex, it is not preferable because a rigid texture is obtained.

  Moreover, in order to give a firmness, stiffness, and dry feeling, it is necessary to set the ratio of the number of single yarns of the thick yarn group to 5 to 50% with respect to the entire mixed yarn, but the ratio of the number of single yarns of the thick yarn group As the value increases, the dry feeling is emphasized and a rough and rigid feeling may occur. On the other hand, the ratio of the number of single yarns of the fine yarn group needs to be 20 to 70%. As the ratio of the number of single yarns in the fine yarn group becomes smaller, the soft feeling becomes poorer, the dry feeling is emphasized, and the coarse and rigid feeling may occur, so 40% or more is preferable.

  Further, it is necessary that a part or all of the cross-sectional shape of the thick fine yarn exhibits a non-rotationally symmetric shape having a substantially straight flat trunk portion and a protruding portion as shown in FIG. 3, for example. That is, it is stable with respect to the lateral force, bending, and twisting applied to the single yarn, because it has a flat trunk, and the gap between the single yarns is maintained by restricting the movement and rolling of the single yarn. A feeling of swelling is obtained. Moreover, since there exists a projection part, when the surface of a woven or knitted fabric is slid with a finger, the dry feeling transmitted to a fingertip by catching is obtained.

  The melt spinning method of the mixed yarns of different sizes and different degrees according to the present invention is performed using the melt spinning apparatus according to the present invention shown in FIG. In FIG. 1, below the spinneret 1, along the running direction of the spun yarn, an annular cooling device 2 and a rectifying cover 3 that surrounds the spun yarn and satisfies the expressions (1) and (2). And an oiling device 4 that satisfies the expression (3) is provided. Further, on the downstream side of the oiling device 4, a converging guide 5, an entanglement imparting device 6, a second stage oiling device 7, take-up rollers 8a and 8b, and a scraping device 9 are arranged in this order.

  When melt-spun an atypical / different-fiber blended yarn using the melt spinning apparatus shown in FIG. 1, the molten polymer discharged from the spinneret 1 is cooled and solidified by the annular cooling device 2 to become a filament, and solidified by the rectifying cover 3. After being subsidized and oiled by an oiling device 4 using an oiling roller, it is focused by a focusing guide 5 and entangled by an entanglement applying device 6 to form an atypical and different fineness mixed yarn Y. Then, the different-type and different-fineness mixed yarn Y is applied again with the oiling device 7 in the second stage, and is taken up by the take-up device 9 through the take-up rollers 8a and 8b at a take-up speed of 2500 to 4000 m / min.

  The spinneret 1 used in the present invention includes a group of thick fine yarns having a single yarn fineness of 3 dtex or more and a group of fine fineness yarns having a single yarn fineness of 2 dtex or less. Is a cross-sectional shape having a non-rotationally symmetric shape with straight flat trunks and protrusions, and the ratio of the number of single yarns of the thick yarn group to the whole mixed yarn is 5 to 50%, and the number of single yarns of the fine yarn group It is necessary to use a die having a plurality of spinning holes such that the ratio of the amount becomes 20 to 70%. In order to make the cross-sectional shape of the thick fine yarn have a non-rotationally symmetric shape having a substantially straight flat trunk portion and a protruding portion, for example, the spinning hole shown in FIGS. The shape is preferred. Further, the cross-sectional shape of the fine fineness yarn is not particularly limited, and is similar to that of the thick fineness yarn, the circular cross-sectional shape, or the triangle or three-leaf obtained from the spinning hole shown in FIGS. The thing of a cross-sectional shape etc. can be used.

  Further, the rectifying cover 3 needs to be provided directly below the annular cooling device 2 and preferably connected to the annular cooling device 2 so as to surround the spun yarn. Moreover, the length (yarn running direction) L (mm) is 1.5 times or more, preferably 2.5 to 3.5 times the length A of the annular cooling device 2 as in the above formula (1). And the length R (mm) of one side (short side) of a square or rectangle which is a cross section in the case of a box type is the diameter B of the annular cooling device 2 as in the above formula (2). As mentioned above, Preferably 2.0 to 3.0 times is required.

  When the length L of the rectifying cover 3 is shorter than 1.5 times the length A of the annular cooling device 2 or when R (mm) is smaller than the diameter B of the annular cooling device 2, the fineness yarn and the thickness yarn Unevenness of the cooling difference is not corrected, spots are generated, single yarns are fused by the yarn swinging, and fluff, loops, etc. are generated in the cheese to be picked.

  In consideration of spinning workability, the rectifying cover 3 is preferably openable at the front surface, and the material is not particularly limited as long as it has an appropriate rigidity. Paper, wood, metal, A synthetic resin or the like can be used.

  Next, in the oiling device 4 such as an oiling roller, the distance OR (mm) from the upper end of the rectifying cover 3 to the oiling device 4 is equal to or longer than the length L + 100, preferably L + 200, of the rectifying cover 3 as shown in the above formula (3). ˜L + 400 is satisfied, that is, it is necessary to provide 100 mm or more below the lower end of the rectifying cover 3. If the distance from the lower end of the rectifying cover 3 to the oiling device 4 is shorter than 100 mm, the oil film thickness of the oiling device 4 changes due to the cooling air and the accompanying air current, and the oil agent becomes non-uniformly adhered to the cheese that is scraped off. Problems such as the occurrence of loops and fluff and a decrease in spinning operability arise.

EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited to these. In addition, the characteristic evaluation in an Example was performed as follows.
(A) Single yarn fineness After the mixed yarn is cut to about 10 cm, it is separated and all single yarn finenesses are measured using DENII COMPUTER DC-11 manufactured by SEARCH Co., Ltd. The average value of each of the yarn group and the intermediate fine yarn group was defined as each single yarn fineness.
(B) Texture evaluation The obtained atypical heterogeneity mixed yarn was subjected to stretching false twisting using a stretching false twisting machine under conditions of a draw ratio of 1.4, a heat treatment temperature of 160 ° C., and a twist number of 3670 T / M. Evaluation yarn for swell, softness, and dryness of the woven fabric using a textured yarn with a warp density of 100 / 2.54 cm and a weft density of 100 / 2.54 cm. In comparison with a false twisted yarn woven fabric having a triangular cross section of 110 dtex (single yarn fineness of 2.5 dtex), the sensory evaluation was performed as follows, and C was rejected.
A: Much better than evaluation standard yarn B: Slightly better than evaluation standard yarn C: Equivalent or inferior to evaluation standard yarn

(C) Spinning property The operation was carried out for 24 hours using 12 spindles of spinning, and the evaluation was made in the following three stages based on the number of yarn breakage from spinning to winding and the package defect rate, and C was rejected.

Package defect rate (%) = (number of defective packages / total number of packages) × 100
A: Number of times of thread breakage is 0 to 2 times, package defect rate is less than 1% B: Number of times of yarn breakage is 3 to 5 times, Package defect rate is 1% to less than 4% C: Number of yarn breakage times is 6 times or more, Package defect rate is 4% or more When the evaluation differs depending on the number of yarn breakage and the package defect rate, the lower evaluation was adopted.

(D) Number of single yarn partial dark dyeings The same false twisted yarn used in the texture evaluation, knitted 5000m, and evaluated in the following three stages according to the length and number of single yarn dark dyed parts. , A only passed.

A: 0 to 3 portions less than 1 cm in length of the single yarn deeply dyed portion B: 4 portions or more in the length of less than 1 cm of the single yarn deeply dyed portion C: 1 cm or more in length of the single yarn deeply dyed portion One or more parts (e) Comprehensive evaluation It evaluated in the following 3 steps | paragraphs by texture evaluation, yarn-making property, and single yarn partial deep dyeing number.

○: All items are acceptable △: There is one failure in any item ×: There are two or more failures in any item

Example 1
Polyethylene terephthalate having an intrinsic viscosity (measured at a temperature of 20 ° C. using an equal mass mixture of phenol and ethane tetrachloride as a solvent) of 0.68 has three shapes in the shape shown in FIG. Using a spinneret having 44 spinning holes, spinning is performed at a spinning temperature of 300 ° C. and a discharge rate of 29.4 g / min, and an annular cooling device (length: 300 mm, diameter: 130 mm) and one side surrounding the spun yarn below it. After passing through a rectifying cover having a square section of 450 mm in length (450 mm in length), oil was applied by an oiling roller 150 mm below the lower end of the rectifying cover. Subsequently, entanglement is applied by a entanglement applying device, oil is applied again by a second-stage oiling roller, and then a semi-undrawn yarn of 100 dtex / 44f at a take-up speed of 3000 m / min through the take-up roller (the desired variant). The finely mixed yarn was cut into a package.

(Examples 2 to 5)
The same procedure as in Example 1 was performed except that the single yarn fineness of the thick fine yarn group, the ratio of the number of single yarns of each fine yarn group to the entire mixed yarn, the length of the rectifying cover, and the position of the oiling roller were changed as shown in Table 1. Thus, a mixed yarn having a different type and a different size was obtained.

(Comparative Example 1)
In the same manner as in Example 1 except that the single yarn fineness of the thick yarn group and the ratio of the number of single yarns of each fine yarn group to the entire blended yarn were changed as shown in Table 2 and the rectifying cover was not provided, the atypical different fineness A blended yarn was obtained.
(Comparative Examples 2 to 5)
Except that the single yarn fineness of the thick yarn group, the ratio of the number of single yarns of each fine yarn group to the whole mixed yarn, the length of the rectifying cover, and the position of the oiling roller were changed as shown in Table 2, the same procedure as in Example 1 was performed. Thus, a mixed yarn having a different type and a different size was obtained.

  Table 1 shows the evaluation results of the atypical and different fineness mixed yarns obtained in Examples 1 to 5, and Table 2 shows the evaluation results of the different and different fineness mixed yarns obtained in Comparative Examples 1 to 5.

  As is clear from Table 1, the woven fabrics obtained from the mixed yarns of the different types and sizes of Examples 1 to 5 have a feeling of dryness, softness and swell, and have a yarn forming property and a single yarn part. The evaluation for occurrence of dark dyeing was also good.

  On the other hand, in Comparative Example 1, since there is no rectifying cover, cooling is insufficient, fluff and loops are seen in the cheese that has been tapped, and a single yarn partial deep dyeing occurs on the tubular knitted fabric after false twisting. The fabric had spots on the texture. In Comparative Example 2, since the single yarn fineness constituting the thick yarn group is thin, there is no firmness and stiffness, and there is little difference in fineness between the single yarn constituting the thick yarn group and the fine yarn group. It became a certain texture.

  Next, in Comparative Example 3, since the rectifying cover is short, a sufficient cooling effect cannot be obtained, and yarn breakage, fluff and loops are generated by fusion between single yarns, and the position of the oiling roller is close to the rectifying cover. Since it was too much, the adhesion spot of the oil agent occurred and the yarn-making property was inferior. Further, since the obtained mixed yarn was composed of a thick fine yarn and an intermediate fine yarn, the fabric had a strong sense of firmness and stiffness. In Comparative Example 4, since the flow straightening cover is short, a sufficient cooling effect cannot be obtained, and yarn breakage, fluff and loops are generated by fusion between single yarns, and the yarn forming property is inferior. Because of the high fiber mixing ratio, the firmness and firmness were further emphasized and the softness was lacking.

Moreover, since the ratio of the fine yarn group in the obtained blended yarn was high, the comparative example 5 did not have a firmness and a firm feeling in the woven fabric, and only the soft feeling was emphasized.

It is a general | schematic process figure which shows one embodiment of the melt spinning apparatus of the atypical different fineness mixed yarn of this invention. (A) (b) (c) (d) is the schematic which shows the embodiment of the spinning hole used by this invention. It is the schematic which shows the cross-sectional shape of the thick fine yarn obtained using the spinning hole shown in (d) of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spinneret 2 Annular cooling device 3 Rectification cover 4 Oiling device 5 Convergence guide 6 Entangling device 7 Oiling device 8a 1st take-up roller 8b 2nd take-up roller 9 Take-off device Y Variant heterogeneity mixed yarn

Claims (2)

The fine yarn group includes a thick yarn group having a single yarn fineness of 3 dtex or more and a fine yarn group having a single yarn fineness of 2 dtex or less, and the ratio of the number of single yarns of the thick yarn group to the whole mixed yarn is 5 to 50%. The ratio of the number of single yarns is 20 to 70%, and part or all of the cross-sectional shape of the thick yarn is a thermoplastic filament having a non-rotationally symmetric shape having a straight trunk portion and a protrusion portion. When melt-spinning the mixed yarns having different sizes and different sizes, the thermoplastic filament group melt-spun from the same spinneret is cooled with an annular cooling device, and then the spinning yarn is surrounded and the following formula (1): Flowing through the rectifying cover satisfying (2), and then applying an oil agent with an oiling device satisfying the following formula (3), and then drawing at a take-off speed of 2500 to 4000 m / min, Melt spinning method of yarn .
L ≧ A × 1.5 (1)
R ≧ B (2)
OR ≧ L + 100 (3)
L: Length of rectifying cover (mm)
R: Diameter when the rectifying cover is cylindrical, and in the case of a box type, the length (mm) of one side (short side) of a square or rectangle which is a cross section
A: Length of the annular cooling device (mm)
B: Diameter of the annular cooling device (mm)
OR: Distance from the upper end of the rectifying cover to the oiling device (mm) An apparatus for carrying out the melt-spinning method for heterogeneous different-fineness mixed yarn according to claim 1, wherein an annular cooling device and a spun yarn are provided below the spinneret along the running direction of the spun yarn. A melt spinning apparatus for a mixed yarn of different sizes and different degrees, characterized in that a flow straightening cover that satisfies the above formulas (1) and (2) and an oiling device that satisfies the above formula (3) are provided.