JPH0797731A - Conjugate yarn for woven or knit fabric - Google Patents

Abstract

PURPOSE:To obtain conjugate yarn for woven or knit fabric having high softness and bulkiness and moderate stretchability and drapeability by entangling a specific spontaneously elongating polyester multifilament and a specific false- twisted polyester conjugate yarn. CONSTITUTION:This false-twisted conjugate yarn is composed of two or more kinds of polyester multifilaments consisting of a spontaneously elongating polyester multifilament having a single fiber fineness of <=3 de, a filament number of >=5, a hot-water shrinkage of >=-2%, a dry-heat shrinkage of <=0% at 160 deg.C and a breaking elongation of >=50% and a polyester multifilament having different elongation at break. The yarn is an alternately twisted yarn containing the high-elongation yarn wound around the low-elongation yarn and having a hot-water shrinkage of >=0% and a 160 deg.C dry-heat shrinkage higher than that of the spontaneously elongating yarn by >=5%. The spontaneously elongating yarn and the false-twisted conjugate yarn are aligned at a blending ratio of the false-twisted yarn of 30-70% in terms of denier ratio and supplied to an air jet nozzle to effect the entanglement and obtain a conjugate yarn having an entanglement degree of 20-100/m.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite yarn for knitted fabric, which is soft, rich in bulkiness, and has appropriate tension and drape.

[0002]

2. Description of the Related Art Various yarns having a silky texture have been developed as yarns for knitted fabrics made of synthetic fibers such as polyester and nylon, and in some fields, properties superior to silk have been obtained. For example, a composite yarn composed of a plurality of polyester multifilament yarns having different heat shrinkage properties shows excellent properties such as bulkiness and warmth, and is widely used. A composite yarn composed of a polyester filament which is elongated by heat treatment and a filament which is contracted is disclosed in JP-A-55-62240 and JP-A-56-112537.
It is known from JP-A No. 60-28515 and the like, and these are excellent in that a soft texture can be obtained.

However, these composite yarns are insufficient in terms of bulge, moderate tension, waist, etc., and a loop made of filaments protruding due to elongation causes a slimy feel, and a large difference in yarn length occurs due to heat treatment. Since it is expressed, the yarn is separated, and there is a problem that it becomes difficult to handle in the subsequent process. In addition, when a multifilament yarn having a large heat shrinkability is used for the core yarn to increase the bulge, only the core portion becomes hard and a so-called texture with a core is formed. The bulge was inadequate when using small multifilament yarns.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a composite yarn which gives rise to bulges in the finishing heat set after knitting and weaving, is flexible, has a high bulkiness, and has appropriate tension and drape. Is provided.

[0005]

The composite yarn for knitted fabric of the present invention comprises a spontaneously extensible polyester multifilament yarn and two or more kinds of polyester multifilament yarns having heat shrinkability and different breaking elongations. It is a composite yarn for knitted fabric, which is entangled with a composite false-twisted yarn, and the degree of entanglement is 20 to
100 / m, the mixing ratio of the composite false twisted yarn in the composite yarn is 30 to 70% in denier ratio, and the spontaneously extensible polyester multifilament yarn is composed of 5 or more filaments having a fineness of 3 denier or less, Hot water shrinkage is -2% or more, dry heat shrinkage at a temperature of 160 ° C is 0%
Hereinafter, the composite false-twisted yarn having a breaking elongation of 50% or more, and the above-described composite false-twisted yarn forming the composite false-twisted yarn, has a relatively high-extension multifilament yarn alternately twisted around the comparatively low-extended multifilament yarn. The composite false-twisted yarn has a hot water shrinkage ratio of 0% or more and a dry heat shrinkage ratio at a temperature of 160 ° C. of 5% or more than the dry heat shrinkage ratio of the spontaneously stretchable polyester multifilament yarn. Characterized by being large.

The spontaneously extensible polyester multifilament yarn of the present invention does not elongate at a relatively low temperature as in the sizing step in the weaving preparation step, but elongates in a high temperature heat treatment at 160 to 180 ° C. as in a finish set after weaving and weaving. However, the hot water shrinkage is −2% or more, preferably 5% or less, and the dry heat shrinkage (160 ° C.) is 0% or less, preferably −
The dry heat shrinkage is 15% or more and is smaller than the dry heat shrinkage (160 ° C.) of the composite false twisted yarn, and the difference is 5% or more, preferably 50% or less. The elongation at break is 50% or more, preferably 100% or less, and more preferably 80% or less. And, the above spontaneously extensible polyester multifilament yarn used in the present invention,
A multifilament yarn composed of 5 or more polyester filaments having an average fineness of 3 denier or less, preferably 0.2 denier or more. The above filament is
A triangle having at least one recess on the outer circumference of the cross section,
It is preferable that the cross section has a modified cross section (including hollow) such as a hexagon or a flat shape.

The above spontaneously extensible polyester multifilament yarn is manufactured, for example, as follows. That is, the molten polyester is spun at a speed of 1500 to 4000 m.
/ Min, preferably 2000-4000 m / min,
The obtained undrawn yarn has a temperature of Tg to Tg + 20 ° C (however, Tg
Is the glass transition point), and the breaking elongation after stretching is 30 to 45.
%, Δn is 0.10 to 0.14, and then the temperature is Tm to Tm −10 ° C. (where Tm is melting point ≈170
C.), a non-contact type heater having a length of 0.1 to 2 m is used, relaxation heat treatment is performed under the condition of an overfeed rate of 20 to 60%, and the heat treatment is performed at a speed of 100 to 1500 m / min.

However, if the spinning speed is less than 1500 m / min, the physical properties after stretching become unstable and the thickness unevenness becomes large, while if it exceeds 4000 m / min, the spontaneous stretching property after stretching becomes low, A knitted fabric having a desired texture cannot be obtained.
If the stretching temperature is less than Tg, stretching becomes unstable, and T
If it exceeds g + 20 ° C, crystallization will proceed and spontaneous elongation will decrease. If the breaking elongation is less than 30%, the operability during drawing is reduced, and if it exceeds 45%, the occurrence of yarn unevenness increases. Also,
When Δn is out of the range of 0.10 to 0.14, the spontaneous elongation due to the relaxation heat treatment becomes unstable. And, if the heater temperature during the relaxation heat treatment is less than Tm, no effect is obtained.
If the temperature exceeds m-10 ° C, thread breakage will occur when the machine is stopped.

The composite false twisted yarn, which is composited with the above spontaneously extensible polyester multifilament yarn by entanglement, has ordinary heat shrinkability, but is composed of two or more kinds of polyester multifilament yarns having different breaking elongations, For example, it is produced by aligning two kinds of polyester undrawn yarns having different breaking elongations and subjecting them to simultaneous drawing false twisting, and a relatively high breaking elongation is obtained around the polyester multifilament yarn having a relatively low breaking elongation. The high polyester multifilament yarn has a form in which it is wound in an alternating twisted yarn form. Before the simultaneous drawing and false twisting described above, the bulge can be increased by supplying the air jet nozzle to mix and entangle the fibers.

This composite false twisted yarn has a hot water shrinkage of 0%.
It is preferably 3% or more, and the difference between the dry heat shrinkage at 160 ° C. and the dry heat shrinkage of the spontaneously stretchable polyester multifilament yarn is 5% or more. The dry heat shrinkage of the composite false twisted yarn itself is preferably 4% or more. The breaking strength and breaking elongation of the composite false twisted yarn are preferably 2 g / d or more and 40% or less, respectively. The mixing ratio of the polyester multifilament yarn having a relatively low breaking elongation in the composite false twisted yarn is preferably 20 to 80% in terms of denier ratio.

The difference in elongation at break between the two types of undrawn yarns is preferably such that the high elongation yarns constituting the composite false twisted yarn are 3 to 13% longer than the lengths of the low elongation yarns. When the difference in breaking elongation is small and the difference in yarn length is less than 3%, the knitted woven fabric is insufficient in bulge, and when the difference in breaking elongation is large and the difference in yarn length exceeds 13%, The bulge of the knitted fabric becomes excessive,
It has a soft texture. When the difference between the breaking elongations is small, the two types of undrawn yarns are aligned and supplied to the air jet nozzle for mixed fiber entanglement before the simultaneous drawing and false twisting described above. Preferably. Further, the breaking elongation of the polyester unstretched yarn is 350% or less in terms of stability with time of physical properties and operability during false twisting for both those having relatively low elongation and those having relatively high elongation. preferable.

The self-expanding polyester multifilament yarn and the composite false twisted yarn described above are aligned, supplied to an air jet nozzle and entangled to obtain the composite yarn for knitted fabric of the present invention. However, the mixing ratio of the composite false twisted yarn in the composite yarn for knitted fabric is 30 to 7 in terms of denier ratio.
It is set to 0%. The degree of entanglement is 20 to 100 pieces / m
Is set to.

The elongation at break, hot water shrinkage, dry heat shrinkage and entanglement in the present invention are measured by the following methods.

Elongation at break In accordance with JIS-L-1013 (1981), using Tensilon manufactured by Toyo Baldwin Co., Ltd., sample length (gauge length)
An SS curve is drawn at 200 mm and a pulling speed of 200 mm / min, and the curve is calculated from this curve.

Hot water shrinkage rate (SHW) According to JIS-L-1073, a lap reel having an appropriate frame circumference is wound 8 times with an initial load of 1/10 g / denier and 1/30 g / denier. The length L ₀ (mm) is measured by applying the load of No. 1, then the above load is removed, and the above-mentioned ridge is immersed in boiling water with a load of 1/1000 g / denier, and boiled after 30 minutes. After taking out from water and cooling, a load of 1/30 g / denier is applied again and the length L ₁ (mm) is measured, and calculated by the following formula. SHW = (L ₀ −L ₁ ) × 100 / L ₀

Dry Heat Shrinkage (SHD) After measuring L ₀ (mm) in the same manner as in the measurement of hot water shrinkage, the drip is immersed in boiling water under a load of 1/1000 g / denier. Instead, heat-treat in an oven at dry heat of 160 ° C, then cool and then again 1 / 30g
/ Denier load is applied and the length L ₂ (mm) is measured and calculated by the following formula. SHD = (L ₀ −L ₂ ) × 100 / L ₀

Degree of entanglement A thread of an appropriate length is taken out, marks are made at intervals of 1 m, the threads are floated on water, and the number of constrictions of the spontaneously extensible polyester multifilament thread between the marks is measured. It is repeated 5 times and averaged, and this average value is taken as the degree of confounding.

[0018]

The composite yarn E for knitting and woven fabric of the present invention is warped in accordance with a conventional method, woven after sizing, and further heat-set after dyeing and drying. When exposed to a high temperature of 160 to 180 ° C., each filament constituting the spontaneously extensible polyester multifilament yarn A is elongated as shown in FIG. 1, while at least two types of heat shrinkage constituting the composite false twisted yarn D are contracted. Since the flexible polyester filament yarns B and C contract to form a core, the constituent filaments of the spontaneously stretchable polyester multifilament yarn A project in a loop shape on the cloth surface,
It has a soft texture. Moreover, since the composite false twisted yarn D is a false twisted yarn having a multilayer structure in which the polyester multifilament yarn C having a relatively high elongation is wound around the polyester multifilament yarn B having a relatively high elongation in an alternate twisted yarn shape,
While forming the core as described above, a void is formed in the core itself. Therefore, the knitted and woven fabric is given more bulge and warmth than the wool product, and appropriate tension and drape property, due to the soft surface touch and the interference due to the formation of the loop.

However, in the above-mentioned knitted and woven composite yarn, there is almost no difference in yarn length between the spontaneously extensible polyester multifilament yarn and the composite false twisted yarn at the yarn stage, and the treatment temperature is 100 ° C. even in the sizing step. Since the above yarn length difference does not occur and the yarn surface is smooth, the composite yarn does not get caught when passing through the guides or the combs in the series of steps from the weaving preparation step to the weaving step. Good processability and easy weaving.

However, when the hot water shrinkage rate of the spontaneously extensible polyester multifilament yarn is less than -2% and the extensibility is large, the above yarn length difference appears in the sizing step, and therefore the subsequent steps are passed. When the dry heat shrinkage at a temperature of 160 ° C. exceeds 0%, or the difference in dry heat shrinkage between the composite false twisted yarn and the spontaneously extensible polyester multifilament yarn is less than 5%, In the final heat setting for finishing, sufficient bulge and soft texture cannot be obtained, and the object of the present invention is not achieved.
However, if the difference in the dry heat shrinkage becomes too large and exceeds 50%, the loop protruding from the cloth surface becomes too large,
Glistening occurs when ironing. The same applies when the hot-water shrinkage of the spontaneously stretchable polyester multifilament yarn exceeds 5% and the dry-heat shrinkage of less than -15%.

The breaking elongation of the above spontaneously extensible polyester multifilament yarn is 50% or more, preferably 100.
% Or less, but when it is less than 50%, it becomes difficult to obtain the above-mentioned hot water shrinkage rate (-2% or more), and therefore the fabric surface is covered with the above-mentioned filament loop to soften the texture. Becomes impossible. However, if the elongation at break exceeds 80%, particularly 100%, the handleability is deteriorated, which is not preferable.

This spontaneously extensible polyester multifilament yarn is formed by 5 or more polyester filaments having a fineness of 3 denier or less, preferably 0.2 denier or more, but it is necessary that each filament is 3 denier or less. However, the average fineness may be 3 denier or less. When the average fineness exceeds 3 denier, even if the breaking elongation is large and the Young's modulus is low, the texture becomes rough and hard, and the object of the present invention cannot be achieved.
If the denier is less than 2 denier, even if the cross section is irregular, the filament tension and stiffness are poor, which is not preferable. Also,
If the number of filaments is less than 5, the surface of the composite yarn or cloth cannot be covered with the filaments, and soft texture cannot be obtained.

When the constituent filaments of the spontaneously extensible polyester multifilament yarn have a modified cross section having one or more recesses on the outer periphery of the cross section, the breaking elongation is large and a slimy feeling is likely to occur. Since a large number of point contact portions are provided between the filaments, a dry touch can be obtained. However, in the case of emphasizing a slimy feeling, or in the case of roughening the filament surface by weight reduction processing to make it dry-touch, such as a full dull yarn having a high content of titanium oxide, it is not necessary to have the above-mentioned irregular cross section.

The external force applied to the composite yarn for knitted fabric of the present invention is mainly borne by the composite false-twisted yarn constituting the core portion thereof. Therefore, the breaking elongation of this composite false twisted yarn is
The content is preferably 40% or less, and when it exceeds 40%, yarn unevenness is likely to occur due to tension applied during rewinding, warping and weaving and knitting, and a knee is apt to occur after knitting into a product. Further, the breaking strength of the above composite false-twisted yarn is preferably 2 g / d or more, and when it is less than 2 g / d, the yarn breakage increases in the steps after the above-mentioned rewinding.

The mixing ratio of the above-described composite false twisted yarn to the entire knitted fabric composite yarn is 30 to 70% in terms of denier ratio. If the mixing ratio is less than 30%, the elongation of the spontaneously extensible polyester multifilament yarn is increased. The bulge due to the difference in yarn length is not expressed under the influence of the force. On the contrary, when the bulge exceeds 70%, a desired texture cannot be obtained because the loop-shaped projections covering the cloth surface are insufficient.

The composite yarn for knitting and woven fabric of the present invention is obtained by entwining the spontaneously extensible polyester multifilament yarn and the composite false twisted yarn composed of two or more kinds of heat-shrinkable polyester multifilament yarns, as described above. because there is,
The composite false-twisted yarn makes the core part by the finishing heat setting after weaving.
The spontaneously extensible polyester multifilament yarns form the surface layer portions, respectively, but since the above-mentioned compounding is performed by the entanglement, after the heat setting, the core part within 1/3 of the radius from the center of the compound yarns is formed. The composite false-twisted yarn is dispersed in a relatively large amount, and the spontaneously extensible polyester filament is dispersed in a relatively large amount in the surface layer portion within 1/3 of the radius from the surface. When the degree of entanglement is less than 20 pieces / m, the composite yarn for knitting fabric easily separates into the spontaneously extensible polyester multifilament yarn and the composite false-twisted yarn. The number of loops is reduced, and the alternate twisted structure of the composite false twisted yarn is destroyed, so that the knitted and woven fabric is poor in flexibility, tension, and stiffness, and moreover, the spontaneously extensible filaments are easily cut to cause fluffing. .

[0027]

EXAMPLE FIG. 2 shows an example of an apparatus suitable for producing the composite yarn for knitted fabric of the present invention, Ab is a first polyester undrawn yarn which is a raw material of the spontaneously extensible polyester multifilament yarn A, This first polyester undrawn yarn Ab
Is drawn from the first wound yarn Aa, sent to the overfeed roller 14 via the guide 11, the feed roller 12, and the hot roller 13, and is stretched at a temperature of Tg to Tg + 20 ° C., and then the above-mentioned overfeed roller 14 is drawn. Is sent to the first delivery roller 16 through the non-contact heater 15 having a temperature of 170 ° C. to Tm −10 ° C., and is heat-treated in a relaxed state during this time to obtain the spontaneously extensible polyester multifilament yarn A.

This spontaneously extensible polyester multifilament yarn A comprises a composite false twisted yarn D drawn from a fourth winding yarn Da through a guide 11a and the first delivery roller 16 described above.
In the air jet nozzle 17
Sent to and entangled with the composite false twisted yarn D, and the composite yarn E for knitted fabric obtained by this entanglement is wound around the fifth wound yarn Ea via the second delivery roller 18 and the winding roller 19.

FIG. 3 shows an example of a drawing false twisting machine suitable for producing the above-mentioned composite false twisting yarn D. In the figure, Bb is a second polyester undrawn yarn having a relatively small breaking elongation, Cb is a third polyester undrawn yarn having a relatively large breaking elongation, and each is a second wound yarn Ba and a third wound yarn Ca. From the first guide 21, through the first guide 21, and after being converged by the converging guide 22, sent from the feed roller 23 to the air jet nozzle 24 for mixed fiber / entanglement, and mixed / entangled, and then the first delivery roller 25. , The heater 26, the false twisting spindle 27, and the second delivery roller 28 in that order, while being drawn during this time, false twisting is performed around the second polyester stretched yarn B composed of the second polyester unstretched yarn Bb. A composite false twisted yarn D in which a third polyester stretched yarn C composed of the third polyester unstretched yarn Cb is wound in an alternate twisted yarn shape is obtained. Thread D
Is wound on the fourth winding yarn Da driven by the winding roller 29.

Conventional polyethylene terephthalate was spun by a conventional method and wound at a winding speed of 3000 m / min, and the obtained first polyester undrawn yarn Ab was supplied to the apparatus shown in FIG.
Stretching is performed between the feed roller 12 and the overfeed roller 14, and relaxation heat treatment is further performed between the overfeed roller 14 and the first delivery roller 16, in which case the discharge amount during spinning, the stretching ratio during stretching, and the relaxation heat treatment. Ten Multifilament Yarns A with Different Breaking Elongation, Hot Water Shrinkage, and Dry Heat Shrinkage at 160 ° C by Variously Changing the Relaxation Rate at Time, Relaxing Temperature and Setting Time
Was manufactured. The cross-sectional shape of the filament was triangular. The physical properties of these 10 types of multifilament yarns A are shown in Table 1 below.

Table 1 Thickness Filament Number Breaking Elongation Hot Water Shrinkage Dry Heat Shrinkage (Denier) (Book) (%) (%) (%) Example 1 60 36 75 -0.5 -5.5 Implementation Example 2 40 24 73 -0.5 -5.7 Comparative example 1 60 36 87 -5.5 -8.5 Comparative example 2 60 36 53 +3.0 +5.0 Comparative example 3 90 54 76 -0.7- 5.5 Comparative Example 4 30 18 76 -0.5 -5.0 Comparative Example 5 60 36 75 -0.5 -5.5 Comparative Example 6 60 36 36 75 -0.5 -5.5 Comparative Example 7 60 18 70-1.0-5.0 Comparative Example 8 60 36 75 -0.5 -5.5

On the other hand, for the composite false twisted yarn D, ordinary polyethylene terephthalate is spun by a conventional method and wound at two winding speeds of 2600 m / min and 3600 m / min to produce two types of undrawn yarns Bb and Cb. Then, this was set in the draw false twisting machine of FIG. 3, and at that time, the discharge amount at the time of spinning, the draw ratio at the time of draw false twist, the number of false twists, the false twist temperature, and the setting time were variously changed to obtain a thickness Nine types of composite false twisted yarns D having different hot water shrinkage, dry heat shrinkage and yarn length difference were produced. Further, for Comparative Example 8, raw yarn (60 denier, 24 filaments) was prepared in place of the above composite false twisted yarn.
Table 2 shows the configurations of the obtained drawn yarns B and C, and Table 3 shows the configurations and physical properties of the composite false twisted yarns. In the drawn yarns B and C, the filament has a circular cross section.

Table 2 Stretched yarn B Stretched yarn C Thickness Filament number Thickness Filament number (denier) (book) (denier) (book) Example 1 30 12 30 12 Example 2 40 16 40 16 16 Comparative Example 1 30 12 30 12 Comparative Example 2 30 12 30 12 Comparative Example 3 15 9 15 9 Comparative Example 4 45 27 45 27 Comparative Example 5 30 12 30 12 Comparative Example 6 30 12 30 12 Comparative Example 7 30 12 30 12 Comparative Example 8 (raw silk 60 Denier 24 filament)

Table 3 Thickness Filament Number Hot Water Shrinkage Dry Heat Shrinkage Thread Length Difference (Denier) (Book) (%) (%) (%) Example 1 60 24 3.9 4.9 7.0 Implementation Example 2 80 32 3.7 4.8 6.8 Comparative Example 1 60 24 3.9 4.9 7.0 Comparative Example 2 60 24 3.9 4.9 7.0 Comparative Example 3 30 18 3.5 4 .6 6.7 Comparative Example 4 90 54 4.1 5.3 5.3 7.3 Comparative Example 5 60 24 3.9 4.9 7.0 Comparative Example 6 60 24 3.9 4.9 7.0 Comparative Example 7 60 24 3.9 4.9 7.0 Comparative Example 8 (raw silk 60d / 24f) 7.9 10.0-

Multifilament yarn A of Table 1 and Table 3
The composite false-twisted yarn D of No. 1 was overlapped with the first delivery roller 16 of FIG. 2 and entangled with the air jet nozzle 17. The obtained composite yarn E was twisted by a usual method for decyn to weave the decine, and dyed and finish heat set. The physical properties of the composite yarn were measured, and the texture of the obtained fabric and the process passability from the twisted yarn to the weaving were determined. The results are shown in Table 4.

Table 4 Mixing ratio ΔSHD Entanglement degree Fabric touch Process passability Overall evaluation (%) (%) (pieces / m) Example 1 50 10.4 48 ◎ ◎ ◎ ◎ Example 2 67 10.5 50 ◎ ◎ ◎ ◎ Comparative Example 1 50 13.4 48 △ △ △ Comparative Example 2 50-0.1 47 × △ × Comparative Example 3 25 10.1 56 △ △ △ Comparative Example 4 75 10.3 42 × ○ × Comparative Example 5 50 10.4 15 △ △ △ Comparative Example 6 50 10.4 110 △ ○ △ Comparative Example 7 50 9.9 43 △ ○ △ Comparative Example 8 50 15.5 59 △ ◎ △

However, the mixing ratio in the table is the denier component ratio (%) of the composite false twisted yarn to the composite yarn, and ΔSHD is the difference in dry heat shrinkage between the composite false twisted yarn D and the spontaneously extensible multifilament yarn A. In addition, the fabric texture is comprehensively evaluated for softness, bulge, tension, waist, and drapeability, and ◎,
Four-level evaluation was performed in the order of ○, △, and ×. In addition, the process passability is determined by the yarn breakage in the twisted yarn and the operating condition of the loom ◎, ○,
Evaluation was made in four levels in the order of Δ and ×. In the overall evaluation, the fabric texture and the process passability were comprehensively evaluated, and the evaluation was made in four stages in the order of ⊚, ◯, Δ, and ×.

As is clear from Tables 1 to 4 above, Example 1 and Example 2 were good in both texture and process passability. On the other hand, in Comparative Example 1, since the spontaneous elongation of the multifilament yarn A is excessively large, a yarn length difference between the multifilament yarn and the composite false twisted yarn is developed in the sizing step, and the warp yarn is a reed or heddle during weaving. The yarn breakage increased due to the breakage. Comparative example 2
Had a high heat shrinkage and lacked spontaneous stretchability, so even after the heat setting for finishing, the loops of filaments did not protrude to the surface of the cloth, and the softness and bulge were lacking. In Comparative Example 3, since the mixing ratio of the composite false twisted yarn is small and is 25%,
The overall strength of the composite yarn composed of the composite false-twisted yarn and the spontaneously extensible multifilament yarn was reduced, and yarn breakage occurred, and the texture was tight and the stiffness was insufficient.

In Comparative Example 4, the composite false-twisted yarn had a large mixing ratio of 75% on the contrary. Therefore, the number of filament loops protruding on the surface of the fabric was small, and the softness and bulge were lacking. In Comparative Example 5, since the degree of entanglement between the spontaneously extensible multifilament yarn and the composite false twisted yarn was low, they were separated after being combined by entanglement and the process passability was poor. In Comparative Example 6, on the contrary, since the degree of entanglement is high, the number of loops protruding on the fabric surface is reduced, and the alternate twisted yarn structure of the composite false twisted yarn is partially destroyed, so that the softness, swelling, tension and waist of the composite yarn are reduced. It was insufficient. In Comparative Example 7, since the spontaneously extensible multifilament yarn was 60 denier 18 filaments, and the average fineness of the constituent filaments thereof exceeded 3 denier, the fabric after finishing lacked in texture softness. In addition, Comparative Example 8
Since 60 denier 36 filaments of raw yarn were used instead of the composite false-twisted yarn, it lacked in softness, swelling, tension, waist, and drapeability.

[0040]

As described above, the composite yarn for knitted fabric of the present invention comprises a spontaneously extensible polyester multifilament yarn and two or more kinds of polyester multifilament yarns having heat shrinkability and different breaking elongations. Since the composite false-twisted yarn is compounded by entanglement, the elongation of the spontaneously extensible polyester multifilament yarn is not expressed until the final finishing heat setting is performed by knitting, and therefore the knitting and weaving preparation process to the weaving process are performed. If the yarn length difference between the self-stretching polyester multifilament yarn and the composite false-twist yarn is caused by the finish heat setting and the yarn length difference between the yarn and the composite false-twist yarn occurs, The constituent filaments project in a loop on the fabric surface to soften the surface touch, and the core of the composite yarn has a different elongation. It is made of a composite false twisted yarn consisting of two types of yarns, and since this composite false twisted yarn is an alternate twisted yarn in which a high elongation yarn is wound around a low elongation yarn, Softness, bulge, tension, compared to the fabric used
It has an excellent texture in terms of waist and drape.

[Brief description of drawings]

FIG. 1 is a sectional view of an example after finishing heat setting.

FIG. 2 is a front view showing the manufacturing apparatus of the embodiment.

FIG. 3 is a front view showing an apparatus for producing a composite false twisted yarn.

[Explanation of symbols]

 A: Spontaneous stretchable polyester multifilament yarn Aa: First wound yarn Ab: First polyester unstretched yarn B: Second polyester stretched yarn Ba: Second wound yarn Bb: Second polyester unstretched yarn C: Third polyester stretched yarn Yarn Ca: Third winding yarn Cb: Third polyester undrawn yarn D: Composite false twist yarn Da: Fourth winding yarn E: Composite yarn for knitted fabric Ea: Fifth winding yarn 11, 11a: Guide 12: Feed roller 13: Hot roller 14: Overfeed roller 15: Non-contact heater 16: First delivery roller 17: Air jet nozzle 18: Second delivery roller 19: Winding roller 21: First guide 22: Focusing guide 23: Feed roller 24: Air jet Nozzle 25: First delivery roller 26: Heater 27: False twist spindle 28: Second delivery roller 29: Take roller

Claims (1)

[Claims] 1. A composite yarn for knitting and woven fabric, which is formed by intertwining a spontaneously extensible polyester multifilament yarn and a composite false twisted yarn composed of two or more kinds of polyester multifilament yarns having heat shrinkability and different breaking elongations. The entanglement degree is 20 to 100 pieces / m, the mixing rate of the composite false twisted yarn in the composite yarn is 30 to 70% in denier ratio, and the spontaneously stretchable polyester multifilament yarn has a fineness of 3
The filament is composed of 5 or more filaments having a denier or less, the hot water shrinkage rate is -2% or more, the dry heat shrinkage rate at a temperature of 160 ° C is 0% or less, and the breaking elongation is 50% or more. The composite false-twisted yarn is formed by winding a relatively high-elongation multifilament yarn around the relatively low-elongation multifilament yarn in an alternating twisted yarn shape, and the hot-water shrinkage of the composite false-twisted yarn is 0%. Above, temperature 160 ℃
And a dry heat shrinkage of the spontaneously stretchable polyester multifilament yarn of 5% or more.