JPH04214433A - Polyester specific blended yarn - Google Patents

Abstract

PURPOSE:This invention relates to a polyester specific blended yarn having natural touch and high bulkiness which have been not achieved by conventional blended yarns. CONSTITUTION:Polyester filaments A each having a cross-sectional flatness degree of 2.5-15 and PET filaments B are fed into a device displayed at the right drawing to provide the subject blended yarn, both the filaments being produced by adhering two kinds of polyethylene terephthalate(PET) having different intrinsic viscosities, respectively, to each other. The filaments A are core filaments for the blended yarn, have a torsion rate of 20-200 torsions/25mm, and are interlaced with the filaments B as sheath filaments. Parts of the filaments B have small projected parts having a projection coefficient of 0.5-2.5 and a projection height of <=1/3 times the diameter of the filament at a rate of >=2 projections/25mm, have loosened parts having a height of <=3 times the diameter of the filament and a width of >=2 times the height at a rate of >=1 loosened part/25mm on the surface of the blended yarn, and further have interlaced parts at a rate of >=25 parts/m.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special blended polyester yarn suitable for silk-like woven and knitted fabrics for clothing, which has excellent fullness and elasticity.

0002

2. Description of the Related Art Conventionally, as a method of imparting fullness to woven or knitted fabrics, a method of doubling two types of yarns having different shrinkage rates has been known. The mixed fiber yarn obtained by this method exhibits a yarn length difference (bulge) due to the difference in shrinkage under no load, but a sufficient yarn length difference (bulge) cannot be obtained when it is constrained like a woven fabric. . Furthermore, in order to obtain a large bulge, a method is known in which a fluid treatment is performed to form loops on the yarn surface. However, in this case, the yarn loops are approximately the same size, resulting in poor natural bulge.

0003

SUMMARY OF THE INVENTION An object of the present invention is to provide a special polyester mixed fiber yarn that has a natural touch and a high degree of fullness, which cannot be achieved with conventional mixed fiber yarns.

0004

[Means for Solving the Problems] That is, the present invention provides a special polyester blend yarn in which filament A is a core yarn and filament B is a sheath yarn, wherein the filament A has a) flatness L/W of 2; .5 to 15 b) It is a twisted fiber with a twist number of 20 to 200 pieces/25 mm, and is mixed and intertwined with filament B, and a part of the filament B has a protrusion coefficient (protrusion coefficient) on the surface of the mixed fiber yarn. 2 small protrusions with a height of 0.5 to 2.5 (height of protrusion/width of protrusion) of 1/3 or more of the yarn diameter, 25 mm or more, and 3 times the yarn diameter or more At the following height, 1 piece/25 slack part based on the yarn length difference with a width more than twice the height
It is a special polyester mixed fiber yarn having a diameter of 25 mm or more and 25 entangled parts/m or more.

The main purpose of the present invention is to improve ``fullness'' and ``tightness'' among the performances required of textiles, and the core yarn is made of flat latent twisted fibers, and the sheath yarn is made of mixed fibers. The main characteristics are that small protrusions such as loops are formed on the yarn surface, random differences in yarn length are formed, and there are 25 or more entangled portions/m.

First, regarding the use of flat latent twisted fibers in the core yarn, a flat twisted fiber can be regarded as a cylinder with a diameter equal to the maximum length of the cross section of the flat fiber, and the cross section of the flat fiber inside the mixed fiber yarn The effect is similar to that of the presence of round cross-section fibers with a diameter equal to the maximum length of the fiber, giving the fabric appropriate tension. In this way, in order to give the fabric appropriate tension, the number of twists is 20 to 200.
pieces/25mm are required, and the number of twists is 20 pieces/25m.
If it is less than m, the effect of a deemed cylinder cannot be obtained and sufficient tension cannot be obtained. In addition, the number of twists is 200/25m
If it exceeds m, the coil crimp occurs instead of twisting, so the effect of the assumed cylinder cannot be seen and sufficient tension cannot be obtained.

[0007]Furthermore, as mentioned above, the flat twisted fibers exhibit the same effect as the presence of round cross-section fibers that are the same as the maximum length of the flat fiber cross-section inside the mixed fiber yarn, but the round cross-section fibers Since there is more space than when using fibers, this space gives the fabric fullness. In order to exhibit this effect, the flatness of the flat fibers L/W (
The maximum length/maximum width of the fiber cross section must be between 2.5 and 15. If the flatness is less than 2.5, the space created by twisting will be small and sufficient bulge will not be obtained. Furthermore, if the flatness exceeds 15, the flat surface is likely to break, making it impossible to obtain the effects of the present invention.

The number of twists in the present invention can be measured by applying a load of 1 mg/d to the mixed fiber yarn, keeping the yarn under tension, and observing it with a magnifying glass. As seen in Figure 1, the flatness L/W is the maximum length of the fiber cross section/
You can find the maximum width.

Next, in order to obtain sufficient "bulge" in a state where the warp is constrained by the weft and the weft is constrained by the warp as in a woven fabric, the protrusion coefficient (protrusion height/protrusion width) must be 0. 5～
2.5, the protrusion height is 1/3 or more of the yarn diameter.It has 2 protrusions/25 mm or more, and the height is more than the yarn diameter and 3 times or less, and the height is more than twice that height. It has a slack part based on the yarn length difference having a width of 1 piece/25 mm or more, and 25 pieces/25 mm/25 mm or more.
It is necessary to have m or more intertwined parts.

[0010] Normally, different shrinkage mixed fiber yarns generate bulge due to the difference in shrinkage between the core yarn and the sheath yarn, but in a state where the warp is constrained by the weft and the weft by the warp as in fabrics, the difference in shrinkage is caused by the difference in shrinkage. This does not occur easily and it is difficult to obtain sufficient swelling. On the other hand,
The blended yarn of the present invention exhibits fullness through protrusions such as small loops and random yarn length differences, so it is less likely to be constrained by the fabric structure. In particular, the sharp loop structure contributes to the bulge, and the protrusion has a protrusion coefficient (protrusion height/protrusion width) of 0.5 to 2.5, and the protrusion height is higher than that of the yarn. Must be at least 1/3 of the diameter. Protrusion coefficient is 0
．． If it is less than 5, it is too broad and does not contribute to swelling. Moreover, if it exceeds 2.5, the loop will collapse and will not contribute to swelling. If the height of the protruding portion is less than ⅓ of the yarn diameter, it will not contribute to swelling.

[0011] In the mixed fiber yarn of the present invention, it is important that there are at least two such protrusions/25 mm, and in order to give a more natural fullness, it is important that the individual protrusions have different sizes. It is preferable to have a However, using only protrusions such as small loops does not give a natural texture because the loop shapes are almost the same, and random yarn length differences are required to obtain a natural texture. Slack parts based on random yarn length differences cover protrusions such as small loops, giving the yarn random spaces and creating a natural touch.

In the present invention, the space created by the twisted fibers in the core, the loop, and the space created by random yarn length differences are fused to form a very complex and diverse space. Therefore, the fabric using the yarn of the present invention has a very natural feel.

In the present invention, a slack portion based on a random yarn length difference means a slack portion having a height of at least three times the yarn diameter and no more than three times the yarn diameter, and a width at least twice the height, If the height is smaller than the thread diameter, it will not be possible to cover the small loops and the texture will not be natural. On the other hand, if the height exceeds three times the diameter of the yarn, problems will occur in process passability, such as the yarn getting caught in a guide when it is made into a woven or knitted fabric, which is not preferable. Further, it is important that such slack portions due to yarn length differences exist in the mixed yarn at least 1 piece/25 mm with different phases. If the number of slack parts is smaller than this, it will be difficult to cover the small loops and give a natural texture.

In addition, sharp small loops and loose parts due to random yarn length differences must not disappear during the twisting or weaving process, so the fibers within the mixed yarn should not be removed. A stopping point or stop is required to prevent it from slipping. In the present invention, mixed fiber entanglement is used as this stopping point, and in particular, the fact that the sheath yarn and core yarn have mixed fiber entanglement at the root of the protrusion prevents the fibers from shifting in the mixed fiber yarn. It is valid in points. In the present invention, it is essential to have such mixed fiber entanglements (number of entanglements) of 25 pieces/m, and if the number is less than this, it is difficult to function sufficiently as a stopping point.

[0015] Note that the protrusion and yarn length difference are determined at 0.05 g/d by making sure that the measured portion of the yarn does not touch anything else.
The yarn is projected onto a magnifying projector while being stretched at a tension of , yarn length difference R
The width Rd and height Rh of can be measured.

[0016] The number of entanglements is defined as the number of entanglements when a pin is inserted into the unentangled part of the yarn under a tension of 0.02 g/d and moved in the longitudinal direction of the yarn under a tension of 0.1 g/d. The missing points are considered as interlaced areas, and the number of interlaced areas per 1 m is calculated.

[0017] In the present invention, the latent twisted fibers used for the core yarn are not particularly limited as long as they have the flatness and number of twists as described above, but preferred examples of fibers include the following: Examples include composite fibers in which polymers A and B are joined side-by-side. (1) A component: Polyethylene terephthalate (PET) with [η] of 0.6 or more B component: PET with [η] of 0.1 or more smaller than A (2)
A component: Polybutylene terephthalate (PBT) with [η] of 0.75 or more B component: PBT (3) with [η] smaller than A by 0.1 or more
A component: PETB component that is not substantially copolymerized; 3-
PET (4) A component copolymerized with 15 mol% of the third component; PBTB component not substantially copolymerized; PBT (5) A component copolymerized with 3 to 15 mol% of the third component; PE
T B component; PBT (6) A component; PET B component; Blend polymer of PET and PBT (7) A component; polyethylene terephthalate (PET) with [η] of 0.6 or more B component; η↓ Nylon 66(8)A component with R of 2 or less;
Polyethylene terephthalate (P
ET) Component B: Nylon 6 with η↓R of 2 or less (9) Component A: Polyethylene terephthalate (PET) with [η] of 0.6 or more Component B: Ethylene acetic acid with an ethylene component of 40 to 80 mol% Vinyl copolymer (10) Component A: PET copolymerized with 3-15 mol% of the third component Component B: Ethylene-vinyl acetate copolymer with 40-80 mol% of ethylene component

[0018] Here, PET or PBT in which substantially no third component is copolymerized means that less than 5 mol% of the third component is copolymerized, such as isophthalic acid, adipic acid, sebacic acid,
A copolymer of sulfoisophthalic acid, diethylene glycol, neopentyl glycol, 1,4 butanediol, etc., or a kneading agent of 5% by weight or less, for example,
Matting agents, heat stabilizers, pigments, carbon, silica, or antistatic agents (e.g., polyalkylene glycols, alkylbenzenesulfonic acids), flame retardants (P and Br compounds)
etc. may be included.

[0019] In addition, such a composite fiber can be produced by employing a conventionally known composite spinning method.

The fibers constituting the sheath thread used in the present invention include, but are not particularly limited to, polyesters such as polyethylene terephthalate and polybutylene terephthalate, and polyamides such as nylon 6 and nylon 66. Polyester mainly composed of ethylene terephthalate units is used.

[0021] Further, if the boiling water shrinkage rate of the core yarn is 10% or more and the boiling water shrinkage rate of the sheath yarn is 5% or less, it is possible to impart bulge as a differentially shrinkable mixed fiber yarn. Next, the method for manufacturing the mixed fiber yarn of the present invention will be described. FIG. 3 shows an example of an apparatus used in the present invention.

The core yarn 1 and the sheath yarn 2 are supplied to the taslan nozzle 5 by three and four feed rollers at different speeds, respectively, and are subjected to air entanglement treatment. At this time, the Taslan treatment requires air-Taslan treatment that does not use water. When water is used, only small loops are generated and random yarn length differences are not generated. In order to generate random yarn length differences, gentle taslan air-taslan processing is very effective. Next, the yarn that has undergone the Taslan treatment is transferred to the first heating roller 6.
heat treated. As the core yarn contracts, small loops and random yarn length differences are generated. Thereafter, the size of the small loop and the random yarn length difference can be adjusted by the second heating roller 7 as required. And 8,
It is wound up through roller 9. The yarn thus obtained can be twisted under normal relaxing and dyeing conditions to form the mixed fiber yarn of the present invention.

[0023]

[Examples] The present invention will be specifically explained below with reference to Examples. [Example 1] Polyethylene terephthalate (a) with [η] = 0.55
and [η] = 0.72 polyethylene terephthalate (b) were laminated in a ratio of 1:1 in the transverse direction and composite spun to form an unstretched 230d/24f having the cross-sectional shape shown in Fig. 1(a). Got the thread. This thread was stretched to 75d/2 under the following conditions.
A drawn yarn of 4 f (filament A) was obtained. 1st heating roller: 77°C 2nd heating roller: 90°C 3rd heating roller: Room temperature 1st stage stretch ratio: 1.9 2nd stage stretch ratio: 1.6 This yarn has a flatness L/ W=6.2, torsional shrinkage rate=5.
The boiling water shrinkage rate was 21%.

Polyethylene terephthalate with [η] = 0.65 was wound up at a spinning winding speed of 5500 m/min to form RB75d/48f high speed spinning yarn (filament B) with boiling water shrinkage rate = 3.8%. Obtained.

Next, filament A and filament B
It was processed using the apparatus shown in FIG. 1st feed roller: 500m/min 2nd feed roller: 525m/min 1st heating roller:
475m/min, 80℃ 2nd heating roller: 5
05m/min, 120℃ 1st delivery roller: 510
m/min, room temperature winding speed: 50
0m/min Taslan nozzle air pressure: 6.5kg/cm↑2

The obtained mixed fiber yarn has a protrusion having a protrusion coefficient (protrusion height/protrusion width) of 0.5 to 2.5 and a protrusion height of 1/3 or more of the yarn diameter. 8.5 pieces/25mm
The random yarn length difference is 4 pieces/25 mm with a height of more than 3 times the yarn diameter and less than 3 times the yarn diameter and a width of more than 2 times the height, and the number of entangled core yarns and sheath yarns is 58 pieces/m. Ta. In addition, when we measured the number of twists of this mixed yarn after treating it in hot water at 90°C for 30 minutes, we found that the number of twists in the core yarn was 78/25.
It was mm. In addition, when we made a fabric using the mixed fiber yarn before hot water treatment, we relaxed and dyed it using the usual method.
A product with a natural touch and excellent bulge and firmness was obtained.

[Example 2] Polyethylene terephthalate (a) with [η]=0.53
Polyethylene terephthalate (b) copolymerized with 8 mol % of isophthalic acid and [η] = 0.73 is 1:1 in the transverse direction.
The fibers were laminated and composite-spun at a ratio of 1:1 to obtain an undrawn yarn of 160 d/24 f having the cross-sectional shape shown in FIG. 1(b). This yarn was drawn under the following conditions to obtain a drawn yarn (filament A) of 50 d/24 f. First heating roller: 78°C Second roller: Room temperature stretching ratio: 3.2 This yarn has a flatness L/W of 8.7 and a torsional shrinkage rate of 7.
The shrinkage rate in boiling water was 25%.

[0028] Polyethylene terephthalate with [η] = 0.65 was wound at a spinning winding speed of 5300 m/min to form a triangular cross section with boiling water shrinkage rate = 4.2% RB50d/36f.
A high-speed spinning yarn (filament B) was obtained.

Next, filament A and filament B
It was processed using the apparatus shown in FIG. 1st feed roller: 500m/min 2nd feed roller: 550m/min 1st heating roller:
475m/min, 80℃ 2nd heating roller: 5
05m/min, 120℃ 1st delivery roller: 500
m/min, room temperature winding speed: 50
0m/min Taslan nozzle air pressure: 6.5kg/cm↑2

The obtained mixed fiber yarn has a protrusion having a protrusion coefficient (protrusion height/protrusion width) of 0.5 to 2.5 and a protrusion height of 1/3 or more of the yarn diameter. 7.8 pieces/25mm
, the random yarn length difference with a height of at least 3 times the yarn diameter and a width of at least 2 times the height is 5 pieces/25mm, and the number of entangled core yarns and sheath yarns is 48 pieces/m. there were. In addition, when we measured the number of twists of this mixed yarn after treating it in hot water at 90°C for 30 minutes, we found that the number of twists in the core yarn was 106/
It was 25 mm. In addition, when the mixed fiber yarn before hot water treatment was used to make a fabric, and it was relaxed and dyed using the usual method, a fabric with a natural touch and excellent fullness and firmness was obtained.

[Comparative Example] Polyethylene terephthalate with [η]=0.53 was spun to form a single component 16 having the cross-sectional shape shown in FIG. 1(b).
An undrawn yarn of 0d/24f was obtained. This yarn was drawn under the following conditions to obtain a drawn yarn (filament A) of 50 d/24 f. First heating roller: 78°C Second roller: Room temperature stretching ratio: 3.2 This yarn has a flatness L/W = 8.7 and a torsional shrinkage rate = 0%.
The boiling water shrinkage rate was 24%.

[η] = 0.65 polyethylene terephthalate was wound at a spinning winding speed of 5300 m/min, and a triangular cross section with boiling water shrinkage rate = 4.2% RB50d/36f
A high-speed spinning yarn (filament B) was obtained.

Next, filament A and filament B
It was processed using the apparatus shown in FIG. 1st feed roller: 500m/min 2nd feed roller: 550m/min 1st heating roller:
475m/min, 80℃ 2nd heating roller: 5
05m/min, 120℃ 1st delivery roller: 500
m/min, room temperature winding speed: 50
0m/min Taslan nozzle air pressure: 5.5kg/cm↑2

The obtained mixed fiber yarn has a protrusion having a protrusion coefficient (protrusion height/protrusion width) of 0.5 to 2.5 and a protrusion height of 1/3 or more of the yarn diameter. 4.3 pieces/25mm
The number of random yarn length differences having a height of at least three times the yarn diameter and no more than three times the yarn diameter, and a width at least twice the height was 3 pieces/25 mm. Further, the number of entanglements between the core yarn and sheath yarn was 52 pieces/m. Further, a woven fabric was made using this mixed yarn in the same manner as in Example 1, but the core yarn in the mixed yarn was not twisted and lacked fullness.

[0035]

Effects of the Invention In the mixed fiber yarn of the present invention, by using a specific twisted flat fiber as the core yarn, and also having a specific shaped protrusion and random yarn length difference, It has now become possible to express a natural texture that could not be fully achieved with other methods.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the cross-sectional shape of a typical twisted flat fiber used as a core yarn in the present invention.

FIG. 2 is a conceptual diagram of the mixed fiber yarn of the present invention.

FIG. 3 is a conceptual diagram of a mixed yarn manufacturing apparatus of the present invention.

[Explanation of symbols]

L Maximum length of fiber cross section W Maximum width of fiber cross section P Projection part Pd Protrusion width Ph Height of protrusion R Thread length difference Rd Width of yarn length difference Rh　Height of yarn length difference 1 Core yarn 2 Sheath thread 3 1st feed roller 4 Second feed roller 5 Taslan nozzle 6 First heating roller 7 Second heating roller 8 First delivery roller 9 Winder

Claims (1)

[Claims] Claim 1: A special polyester blend yarn in which filament A is a core yarn and filament B is a sheath yarn,
The filament A is a twisted fiber with a) flatness L/W of 2.5 to 15 b) number of twists of 20 to 200 pieces/25 mm, and is mixed and entangled with filament B; A part of the mixed yarn has small protrusions on the surface of the yarn with a protrusion coefficient (protrusion height/protrusion width) of 0.5 to 2.5 and a protrusion height of 1/3 or more of the yarn diameter. 2 pieces/25 mm or more, a height that is more than or equal to the yarn diameter and less than 3 times the yarn diameter, and a slack part based on the yarn length difference that is at least twice the height; 1 piece/25
A special polyester mixed fiber yarn characterized by having an interlaced portion of 25 pieces/m or more.