JPH03119133A - Polyester composite yarn - Google Patents

Abstract

PURPOSE:To obtain the title composite yarn having soft and elegant dry touch, proper tension and stiffness, elegant luster and excellent deep color feeling by forming specific two polyester multifilament into a composite yarn. CONSTITUTION:The aimed composite yarn composed of (A) multifilament [content in composite yarn: 20-80% (denier ratio)] consisting of filament having <=7 denier single fiber fineness and ratio of short axis and long axis of 1:>=3 and >=10mu length of nearly liner part of long axis and (B) multifilament [content in composite yarn: 80-20%] having >=4g/denier break strength and entangled in 20-100 numbers/m interlace pin count and being >=0% in hot water shrinkage of the ingredients A and B and >=5% in difference between dry heat shrinkage of the ingredient B and A.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a novel polyester composite yarn that is soft, flexible, elegant dry touch, moderate firmness, elasticity, elegant luster, and excellent deep color.

(Prior Art) Polyester multifilaments have been used for various purposes such as clothing and industrial materials due to their excellent properties. Silk-like texture is one of the targets for clothing applications, and various companies are investigating it, and in some fields, it has been found that silk-like texture has surpassed that of silk. For example, a composite yarn consisting of a plurality of polyester multifilaments with different heat shrinkage properties is widely used because it exhibits excellent properties and textures such as fullness, bulk, and warm feel. If all the multifilaments that make up the draping yarn shrink due to heat, due to the binding force of the fabric structure,
It is not possible to ensure a sufficient difference in the shrinkage rate of the yarn, and the fabric tends to become stiff due to the shrinkage of the yarn.For this reason, it is necessary to reduce the basis weight to increase the shrinkage allowance, or to reduce the alkali weight loss rate to ensure the texture. We have taken measures such as increasing the size.

However, filaments with a high heat shrinkage rate generally harden when heat treated, and a fully satisfactory texture has not been obtained. On the other hand, mixed yarns of elongated polyester filaments and filaments that shrink upon heat treatment are also known, such as those disclosed in JP-A-55-82240, JP-A-58-112537, and JP-A-60-28515. and so on. Although these yarns had a much softer and more flexible texture than the above-mentioned shrink yarns, the yarns separated when squeezed or heat-treated in the post-process, causing problems in passing through the process. there were.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned disadvantages of the conventional polyester filament, and is soft, flexible, has an elegant dry touch, moderate firmness, elasticity, elegant luster, and deep color. The purpose of the present invention is to provide a novel polyester composite yarn that has excellent properties and has no problems in passing through subsequent processes.

(Means for Solving the Problems) The present invention has the following configuration in order to solve the problems. That is, it is a polyester composite yarn composed of multifilament A and multifilament B whose yarn physical properties satisfy the following range, and the composite yarn is characterized in that it is entangled with an entanglement degree of 20 to 100 co/m. polyester composite yarn.

Multifilament A: Multifilament (composite yarn) consisting of filaments with a single fiber fineness of 7 denier or less, a ratio of short axis to long axis of 1.3 or more, and a length of the substantially straight part of the long axis of 10 μm or more. Content in the composite yarn: 20-80% [denier ratio]) (A) Multifilament B: Multifilament with a breaking strength of 4 g/denier or more (content in the composite yarn: 80-20% [denier ratio]) )
... (B) SHW (A) ≧0% SHD (
A) 50%5HW (B) ≧0% SHD (B)-SHD (A) ≧5%SHW
: Hot water (100℃) Shrinkage rate (%) SHD: Dry heat (160℃)
°C) Shrinkage rate (%) The present invention will be explained in more detail below.

FIG. 1 is a model diagram after the polyester composite yarn of the present invention is heat-treated to develop a yarn length difference.

In FIG. 1, A is a multifilament that mainly constitutes the sheath, and has been substantially elongated by high-temperature heat treatment (multifilament after spontaneous elongation). B is a multifilament constituting the core, which is a multifilament that has been shrunk by heat treatment (multifilament after heat shrinkage).

First, the heat shrinkage characteristics of the constituent multifilament, which is the most important requirement in the present invention, will be described. Multifilament A constituting the polyester composite yarn of the present invention has a small shrinkage rate difference with multifilament B during normal sizing and other steps, and the multifilament A also shows substantial shrinkage behavior. For this reason, even when the same yarn length difference is produced in the fabric, even if sizing is done at the yarn stage, the yarn length difference (bulges, loops, etc.) does not appear much, and even compared to ordinary different shrinkage mixed fiber yarns that are all heat-shrinkable. During weaving, handling and weaving properties are much better. That is, if a yarn length difference (loop) occurs in the yarn state, the loops will naturally rub against each other during beaming weaving and get caught in guides, combs, etc., or the shedding will be poor and process passability will be significantly reduced. Furthermore, when ordinary heat-shrinkable multifilament is heat-treated during sizing, etc., the heat-setting is almost fixed, and even if it is heat-treated at a high temperature of about 180 to 180°C during final setting, the yarn length difference will be greater than that at the initial heat-setting. Although this does not occur much, the composite yarn of the present invention, which contains multifilaments that shrink in hot water but elongate in high-temperature heat treatment equivalent to final set, has a higher temperature resistance than the shrunken fabric surface as a whole. Through processing, the multifilamen (A) protrudes in a loop shape, creating a soft and flexible touch that resembles the surface of a beach. For this purpose, SHW (A
)≧0%, SHD (A) 50% is required. SHD (B)-SH to further swell and give bulkiness
D (A) ≧5% is required, and if it is less than 5%, the swelling and bulkiness will be poor and it will be excluded from the present invention. However, if it is too large, the protruding loop from the surface will be too large, which may cause problems such as "shininess" when ironing, etc.
% or less is preferable.

Also, for the same reason, 5HW (A) is 5% or less, S HD (A
) is preferably -15% or more.

Next, the ratio of the short axis to the long axis of the multifilament A needs to be 1:3 or more. However, it is excluded from the present invention because it cannot provide the small, soft, flexible, and dry touch feel characteristic of the present invention. However, if the ratio of the short axis to the long axis is too large, the thread will break during quenching, the threading will become unstable when touched by a roller, and the filament will be easily opened into individual filaments, resulting in poor spinning operability and post-processing passability. Since a problem arises in Here, the cross section of the multifilament A of the present invention having a ratio of short axis to long axis of 1:3 or more is basically an oval or rectangular shape, as shown in FIG. axis b
When , it is expressed as a/b.

In order to obtain more elegant gloss and deep color, the length of the substantially straight portion of the long axis may be 10 μm or more, preferably 20 μm or more. In this case, the substantially straight portion of the long axis is shown in FIG. 3! In this case, the normal curved part due to contraction is assumed to be a straight part.

Next, it is preferable that the elongation at break of the multifilament A is 50% or more in order to obtain a soft and flexible texture.

Generally, in order to obtain a soft feel with polyester, it is easier to obtain a filament with a small SHW and a large elongation at break. As described in detail above, it is the spontaneously elongated multifilaments that form loops and cover the surface of the fabric, and the touch of these multifilaments determines the touch of the fabric. However, if the elongation at break is too large, the handling properties will deteriorate, so it should be less than 100%, more preferably 8
0% or less is good.

Next, the elongation at break of the multifilament B is preferably 40% or less, in order to avoid yarn unevenness caused by elongation of the composite yarn in subsequent processes such as winding, knitting, and weaving. Furthermore, this is to prevent problems such as the knees coming off in the product after it has been made into a fabric. Furthermore, the breaking strength of the composite yarn is also substantially dependent on the heat-shrinkable multifilament, so the breaking strength of the heat-shrinkable multifilament must be at least 4g7 denier, and the denier ratio of the composite yarn must be 20% or more.

Of course, if the breaking strength is high, the proportion of multifilament B will be slightly lower (it may be less than 20%, but if it is less than 20%, the shrinkage force of multifilament B will be small and the bulge due to the difference in yarn length will not be expressed), so it is excluded from the present invention. In addition, the hot water shrinkage rate and the IEOC dry heat shrinkage rate of the multifilament B are preferably 5 to 60% and 7 to 80%, respectively.

Alternatively, the multifilament B may be a so-called thick-and-thin yarn having thickness unevenness in the fiber axis direction. however,
In that case, the hot water shrinkage rate may be 5 to 30%.

Thick and thin yarn has an orientation degree (Δn) of 15 to θ0 at the thin part, considering the retention of yarn physical properties after post-processing.
XIO-3, more preferably 20-40X10"'
Thick part is 90X10-3 or more, more preferably 1
80X10-3 or more is preferable. -Generally, when thick and thin yarn is dyed, it shows a difference in shading, but the difference in shading is too strong.However, by heat treating the mixed fiber yarn of this invention, the thick and thin yarn becomes multilayered in the inner layer. Filament A is placed in the outer layer, and the excessively strong shading difference of Thick and Thin yarn is hidden by Multifilament A yarn to create a natural color tone difference.

Next, the multifilament A needs to be composed of single filament denier of 7 denier or less.

If it exceeds 7 denier, the elongation at break will be large and the texture will be rough and hard even if the Young's modulus is low, so it is excluded from the present invention.

However, if it becomes too thin, it will lose its strength and luster, so it is preferably 0.5 denier or more, more preferably 3 denier or more.

However, it may be mixed with 7 deniers or higher (denier mix) as long as it has an average of 7 deniers or less. Further, the number of filaments is preferably 5 or more, and if it is less than 5, the effect of the flat yarn will be reduced, which is not preferable.

Generally speaking, filaments with high elongation at break tend to feel slimy, but in the composite yarn of the present invention, multifilament)A
Since there is no regularity in the long axis direction of the cross-section of single fibers, the number of point contact areas increases and the slimy feeling disappears.

Furthermore, the filament may have a flat cross-sectional shape as shown in FIG. 3, 2.3, having at least one convex portion on the longitudinal axis of the cross-section.

A typical example of the cross-sectional shape of filament A used in the present invention is shown in FIG.

Next, the present composite yarn has a substantially core/sheath structure because multifilaments A are present in large quantities in the surface layer of the composite yarn, so that the loops tend to protrude from the surface of the fabric.

Furthermore, the phrase "substantially having a core/sheath structure" as used herein means only a structure in which the composite yarn is divided into a core part and a sheath part, that is, multifilament B and multifilament A, at the interface. Rather, both components coexist in the entire composite yarn, especially near the interface, and it also means a structure in which multifilament B is mainly self-absorbed in the core, and multifilament A is mainly arranged in the sheath. Multifilament B is larger than multifilament A in terms of weight ratio within 1/3 radius from the center of the composite yarn, and multifilament A is thicker than multifilament B within a radius of 173 from the surface of the composite yarn according to the present invention. Within range. The core/sheath structure and the above-mentioned denier ratio are measured by fixing the composite yarn with epoxy resin, cutting the cross section randomly 100 times, observing it with an optical microscope, and determining the average value and condition from this. It is also essential that they are entangled with a degree of entanglement of 20 to 100. When the degree of entanglement is less than 20, the multifilaments tend to separate from each other due to the difference in yarn length, which significantly impedes processability.

On the other hand, if the degree of entanglement exceeds 100, interlacing spots will be noticeable on the fabric, and the monofilaments of multifilament A may be cut and fluffy, which is not preferable.

Next, the cross section of multifilament B is not particularly limited, but
It is also preferable to make the hollow fibers have a flat cross-sectional shape in the same way as multifilament A in order to give them bulkiness and to further emphasize softness, dry touch, gloss, and deep color.

Furthermore, in the polyester composite yarn of the present invention, both or one of the multifilament A component and the multifilament B component may contain a copolymer of 5-sodium sulfonic acid metal salt, isophthalic acid, etc., or a fine powder inert substance. It may also contain polyester fibers.

Next, when this composite yarn is heated, it becomes soft, firm, firm, and crunchy. However, 2. If the twist is too strong, it is difficult to express the yarn length difference, so the twist is 15,000/(D
(T/m) or less, but this is not necessarily the case if softness, flexibility, and gloss are not required.

Note that the measurement method implemented in the present invention is as follows.

(1) Breaking elongation According to JIS-L-1013 (1981), using Tensilon manufactured by Toyo Baldwin Co., Ltd., sample length (gauge length) 2
The S-8 curve was measured at a tensile speed of 00 mm and a tensile speed of 200 mm/min, and the elongation at break was calculated.

■ Heat shrinkage rate (SHW), dry heat shrinkage rate (SHD) JIS
- According to L-1073, the following was carried out. That is, take a skein wound eight times with an initial load of 1/Log/denier using a wrap reel with an appropriate frame circumference, apply a load of 1/30 g/denier to the skein, and set its length i. (IIIll) is measured.

Then, the load was removed, and the skein was immersed in boiling water for 30 minutes with a load of 1/1000 g/denier applied. After that, remove the skein from the boiling water, cool it down, and then use it again.
Length fl when applying a load of 30 g/denier
(mm). SHD uses the same method as SHW to catch colds. Then, after drying at 60°C for 30 minutes, 1/1
Dry heat at 160℃ with a load of 000g/denier applied.
heat-treat in an oven. Then, after cooling, i/30 again
The length when a load of g/denier is applied! □ (−
m). The hot water shrinkage rate (SHW) and the dry heat shrinkage rate (SHD) are calculated by the following formula.

The images were taken at the ratio b:a shown in FIG.

The configuration and effects of the present invention will be explained with reference to the following examples. hang it vertically. Next, a suitable needle is inserted into the system and slowly lifted, and the distance 7 (am) traveled until the load is lifted is measured 100 times, and the average value j(c+*) is calculated using the following formula.

(4) Flatness A section cut out with a microtome from a sample filament treated with acrylic resin was spun with 400 times ethylene terephthalate at a spinning speed of 3000 m/win in a conventional manner, and an unstretched 32 denier 18 filament with a flat cross section was obtained. Got the thread. The flatness ratio at this time was 1:5. This undrawn yarn was stretched and subjected to a relaxing heat treatment using the apparatus shown in Figure 2, and then heat-shrinkable multifilament yarn B was made of polyethylene terephthalate multifilament yarn copolymerized with 10 mol% of ethylene isophthalate. B) = 65%, SHD (B) 275% 3
The fibers were mixed with 0 denier 18 filament and the composite yarn was wound up.

At this time, the stretching conditions for the heat-stretched multifilament were a stretching ratio of 1.6, a stretching temperature of 82°C, a relaxation rate of 45%, a relaxing temperature of 190°C (non-contact heater length 50c+=), and a delivery speed of 500 m/wi.
Made with n, SHW with 29 denier 18 filament
(A)=0.5%, SHD (A)=-4.0%, D
E was 80%.

Also, for mixed fibers, use Fiber Guide's Air Jet FG-1 as air nozzle 7. The 59 denier 36 filament composite yarn obtained above was subjected to an additional twist of S twist of 400 T/m, and then warped as a warp without sizing. The weft and warp yarns are 59 denier and 36 filament composite yarns with an additional twist of S400 T/m.
0rpm) and the warp density is 185/! nch Woven to a weft density of 85 threads/Inch, processed under the same conditions as normal woven fabrics using different shrinkage blend yarns, and warp density of 185 threads/Inch.
The finished fabric had a nch weft density of 97 threads/inch. The weight loss rate at this time was 20%. In addition, for comparison, a woven fabric was obtained in the same manner as in the example except that the heat-stretched multifilament had a round cross section.

Fabrics using the polyester composite yarn of the present invention exhibited good passability during weaving preparation and weaving processes, had a dry touch, and had excellent soft feel, firmness, and stiffness. On the other hand, the comparative example had a rough and hard texture and did not have sufficient gloss.

(Effects of the Invention) As described above, the polyester composite yarn of the present invention is softer and more flexible than conventional differential shrinkage mixed fiber yarns (including heat-stretched yarns), and has a dry touch and moderate firmness. It has the remarkable effects of having firmness, elegant luster, deep color, and excellent processability.

[Brief explanation of drawings]

FIG. 1 is a model diagram of the polyester composite yarn of the present invention heat-treated to develop a yarn length difference. FIG. 2 is a roadside view showing an example of the manufacturing apparatus. FIG. 3 shows a typical example of the cross-sectional shape of the multifilament A of the present invention. FIG. 4 is a representative example showing the filament distribution state of the polyester composite yarn of the present invention. A: Heat-stretched multifilament B: Heat-shrinkable multifilament C: Polyester composite yarn of the present invention 3: Hot roller 5: Non-contact heater 7: Air jet nozzle

Claims (1)

[Claims] (1) A polyester composite yarn composed of multifilament A and multifilament B whose yarn physical properties satisfy the following range, the composite yarn having an entanglement degree of 20 to 100.
A polyester composite yarn characterized by being intertwined at a ratio of 0/m. Multifilament A: Multifilament (composite yarn) consisting of filaments with a single fiber fineness of 7 denier or less, a ratio of short axis to long axis of 1:3 or more, and a length of a substantially straight portion of the long axis of 10 μm or more. Content rate in the strip 20-80% [
Denier ratio])...(A) Multifilament B: Multifilament with a breaking strength of 4 g/denier or more (content in the composite yarn 80~
20% [denier ratio])...(B) SHW(A)≧
0%SHD(A)≦0% SHW(B)≧0% SHD(B)-SHD(A)≧5% SHW: Hot water (100°C) shrinkage rate (%) SHD: Dry heat (160°C) shrinkage rate(%)