JPH0327140A - Mixed yarn having different fineness and shrinkage - Google Patents

Abstract

PURPOSE:To produce the title mixed yarn having silk-like touch and feeling stably with high productivity by melt-extruding polyester polymer through a specific spinneret, winding up the cooled and solidified filaments and preheating and drawing the filaments. CONSTITUTION:A polyester polymer is melt-extruded through a spinneret which has 4 orifice groups in which the orifices have a cross section of more than 1.6 modification degree and have a combination of slits differing in the shape and dimension, solidified with cooling air within 50mm just under the nozzle plate and taken up at a speed of 5,000 to 6,000m/min. The filaments are preheated at 85 to 120 deg.C and drawn at a rate of 1.1 to 1.2 to give the subject mixed yarn in which the filament denier of the most thick filament group is 3 to 5 denier, while the thinnest group is 0.3 to 1.5 denier, the dry-shrinkage stress of the total yarn is more than 0.25g/d and the temperature at which the maximum shrinkage stress develops is 65 to 80 deg.C.

Description

Detailed Description of the Invention (Field of Application of Industry L) The present invention relates to a silky-like polyester yarn with excellent texture, and relates to a polyester blend yarn with a feel and texture closer to silk, and a method for producing the same. It is.

(Prior art) As a means of adding a silk-like bulge,
As seen in Japanese Patent Application Laid-Open No. 18933, there is a method that provides a difference in shrinkage rate by utilizing a difference in heat coverage during spinning and drawing, and in JP-A-18933.
There are methods such as those disclosed in Japanese Patent Application No. 24529 that utilize differences in shrinkage rates based on differences in polymer composition, differences in dryness, and differences in discharge hole diameters, and after making these into fabrics, alkali weight loss correction is performed. There is a technique to obtain a silk-like texture by combining with.

Furthermore, Japanese Patent Publication No. 61-22047 discloses a technique for obtaining fibers with different shrinkage difference ff at low cost.

(Problems to be Solved by the Invention) However, the conventional technology uses a mixed fiber yarn of two to three different shrinkage components, and the fabric structure has a difference in yarn length between each fiber of silk. There is a big difference, and there are subtle differences in texture. Further, these methods have the disadvantage that the spinning and/or drawing equipment is complicated and the production cost is higher than that of ordinary yarns due to low productivity.

To improve the cost-related disadvantages, a method using both high-speed spinning and direct draw method was published in 1981.
This is proposed in the 22047 publication.

However, this method utilizes the difference in oriented crystallization, and because there is a large difference in the drawing stress between low-shrinkage yarn and high-shrinkage yarn, the resulting drawn yarn will have loops and walnuts, resulting in loose ends.
I have some serious problems in my life. If the draw ratio is lowered to control these factors, loops and walnuts may be reduced, but the shrinkage stress of the raw yarn will be lowered, and the yarn length Missing J,' where no swelling effect can be obtained. I'm hitting j.

The present invention provides a mixed fiber yarn that does not cause loops or slack, and particularly has a heat shrinkage stress of 0.25 g/d or more, preferably 0.25 g/d or more.
28 g/d or more, especially 0.3 g/d or more, which is larger than conventional mixed fiber yarns, and the temperature at which the maximum shrinkage stress occurs is 100 g/d or more.
Since it is formed to have a temperature of 60 to 80 degrees Celsius, which is lower than 60 degrees Celsius, when it is made into a fabric, the yarn length difference due to the binding force between the fibers is not inhibited, and a sufficient swelling effect is achieved. The object of the present invention is to provide a type of multi-component differentially shrinkable mixed fiber yarn and a method for producing the mixed fiber yarn stably and with high productivity.

(F stage for solving the problem) t-1i The present invention that was able to solve the problem is (1
) J+: Different shrinkage mixed fiber yarn consisting of at least four yarn groups having different shrinkage rates, and among the yarn groups, the thickest I yarn group has a diameter of 91. Thread fineness is 3-5
denier, and the lli yarn fineness of the thinnest medium yarn group is 0.
．． 3 to 1.5 denier, the dry heat shrinkage stress of the total yarn of the mixed fiber yarn is 0.25 g/d or more, and the temperature at which the maximum shrinkage force occurs at fraying is 65 to 80 ° C. The cross-sectional shape of each filament constituting is the circumscribed F in the cross section.
A polyester mixed yarn of different fineness and shrinkage, characterized in that the degree of irregularity defined by the ratio of J to the diameter of the inscribed circle is 1.6 or more.

■ The degree of irregularity defined by the diameter ratio of the circumscribed circle and the inscribed circle is 1.6.
A spinneret for producing filaments having the above cross-sectional shape, which has four or more groups of slit combination-type spinning holes with different shapes and dimensions. Discharge, direct spinneret} 5 0
Cooled and solidified with cooling air within 1111, 5000 ~
After taking off at a taking-off speed of 6000 m/min and winding up one ridge, or without winding up at -j, 85 to 1
After preheating at 20℃ 1. This is a drawing of a polyester-based hole-shrinkable blended yarn characterized by stretching at a stretching ratio of L-1.2 times.

The first cost of the present invention is that the maximum fineness of the average fineness among the groups is 3 to 5 deniers, and the minimum fineness is 0. It is necessary to have a denier of 3 to 1.5. The 11th Q+ is the dry M l 8 0 'C of the fiber of the present invention, which depends on the spinning degree of the shrinkage tank.
If Vlb is From the fields of application of the yarn of the present invention,
1i average + t- The appropriate yarn denier is 1.5 to 2 denier. The yarn of the present invention has such an average rJi yarn of 1.5 to 2
In order to eliminate loops and walnuts during spinning with a focus on denier, the maximum tfj and yarn fineness denier is 5 denier, and the minimum drawn yarn medium fineness is 0.3 denier, which reduces shrinkage caused by the fine structure. Maximum for manifestation? 41,
The limit is a combination of yarn fineness of 3 denier and minimum single yarn fineness of 1.5 denier. If the maximum yarn fineness exceeds 5 denier, the fabric obtained will only have a rough, rough texture, and if the minimum yarn fineness becomes thinner than 0.3 denier, problems with resonance during spinning or problems with spun yarn will occur. Due to frequent breaks, the operability of spinning becomes difficult.

The second failure is that the cross-sectional shape of the yarn of the present invention is an irregular cross-section, and the degree of irregularity defined by the diameter ratio of the circumscribed circle and the inscribed circle is 1.6 or more l-
There is a need and support to be. The cross-sectional shape is not particularly limited as long as it is other than a round cross-section, but conventional triangular cross-sections, h-angle cross-sections,
Oblique/rz cross sections etc. can be used.

Further, although the cross-sectional shapes of the filaments are the same even if the cross-sections are the same, it is more preferable that the shapes and rigidity of each group are different. The degree of abnormality is 1. If it is less than 8, the gloss effect will be reduced and it will have a glaring luster, and it will be very slimy and far from silky and dry to the touch.

Further, although the details will be described later, yarns with irregular cross sections are also advantageous in that yarn physical properties as described in I can be obtained at a lower spinning speed than yarns with round cross sections.

The third requirement is that the number of groups with different shrinkage rates is 4 or more and 1. At a certain point. When the thread is manipulated from the cocoon, there is a difference in the pulling tension between each cocoon, so the silk has a delicate thread length between each fiber, creating a bulging effect. For this reason, ideally t11. It is great that shrinkage can be attached to each synthetic fiber, but from the viewpoint of effectiveness and cost, groups of 4 or more are useless. For groups 3 and above, there is little difference from the conventional 2 groups different shrinkage mixed fiber yarn, and 4
By using Group I-12, it is possible to obtain the same fiber structure and texture as when using I+i fabric for the first time. The fiber structure in the 41 cloth can be determined from the concentration of the fibers by observing the cross section of the finished cloth. Here, in the case of a shrinkage mixed fiber yarn having three or more shrinkage groups, although there are inter-fiber voids between the groups, there are few inter-fiber gaps within the group, and the degree of self-pile of each fiber is low.
No improvement in drape pH was observed. When there are 4 or more groups, the number of fibers within the group decreases, and the self-FI1 degree between groups within the group increases, resulting in softness and drape that are closer to silk! :
is obtained.

The fourth requirement is that the peak stress of dry heat shrinkage stress is 0.25 g/d or more than 1'. , preferably 0
．． Its peak occurs at 28 g/d or more, especially 0.3 g/d or more. The point is that 71 degrees is 65-80 degrees Celsius. In order to develop sufficient yarn length resistance while the interfiber binding forces work after fabric formation, the difference in shrinkage rate is necessary, and if there is not sufficient shrinkage stress, the shrinkage ability will decrease due to the interfiber binding force. Therefore, a sufficient swelling effect as shown in I-1 cannot be obtained. Although the binding force differs depending on the weave structure and density, it is said to be 50 g/d for crotch-like woven fabrics, and 0.25 (B g/d or less L1 preferably 0 .2gg/d or more L1 especially 0.
It is necessary that the amount is 3 g/d or more.

In the case of 0.25 g/d or more, even if the shrinkage rate is high, a sufficient difference in yarn length cannot be obtained, and in particular, in the case of high-density fabric, almost no effect of creating a difference in yarn length is observed.

Also, the peak of shrinkage stress occurs! P. /f! When temperature is important and the temperature is less than 65℃, when used as a warp,
During drying after gluing, the stress decreases significantly, making high-speed drying at high temperatures impossible, and gluing-free weaving by interlacing or weak twisting is required, which is disadvantageous due to high costs and limited applications.

In addition, if the peak temperature exceeds 80°C, it becomes necessary to raise the processing temperature to express the yarn length difference, and the normal 80°C
In addition to the scouring at 0 to 90℃, another treatment using the short loop relaxer temple's high temperature treatment will be required, and additional treatment will be required.
[The polyester polymer used in the present invention has a ratio of polyethylene/terephthalate of 1:. The third component may be a copolyester (1).The polyester polymer may also contain a matting agent, a pore-forming agent, a blue agent, an antistatic agent, and a flame retardant. This is also 1+J Noh.

In the present invention, homopolyesters and copolyesters are used.
Although a sufficient effect can be obtained by using it alone, it is more preferable to mix polymers with different compositions. For example, when a yarn is made of a blend of polyester containing 100% polyethylene terephthalate and polyester containing 10 mol% isophthalic acid, the shrinkage rate difference due to the polymer composition is added to the shrinkage rate difference due to the difference in the jl. The different contractions 81 are grouped into multiple groups, resulting in a more striking special texture.

Next, the manufacturing method of the present invention will be described. The method of the present invention is a method for obtaining a multi-component differentially contractible mixed fiber yarn having four or more groups of differentially contractible fibers with +;''5 efficiency.

The first cost is that different output amounts are ejected from groups of slint combination type spinning holes with four or more shapes and different methods.

Here, the slit combination type spinning hole shown in L-j゜ is basically the tanzaku type shown in Fig. 3, and the shapes shown in b to e can be used, but the shape is It is not particularly limited. The shape of the spun filament obtained from the spinning holes shown in a to e in FIG. 3 is shown as he. These shapes are not particularly limited as long as they satisfy the cross-sectional irregularity defined in the previous section.

Further, the discharge hole can be approximately determined by the square of the cross-sectional area of the slit combination type, and is not particularly limited as long as it is within the range of the filament denier. The combination of thick and thin filaments is not particularly limited, but the sum of the deniers of the maximum fineness filament groups is 30 of the total denier.
%, and the total denier of the minimum fineness filament group is preferably 7% or more of the total from the viewpoint of texture.

Figure 4 shows that the shrinkage rate depends on the spinning speed when the cross-sectional shape is round.
r I beat the PL. The first reason is that when compared with the spinning take-up speed using irregularly shaped holes, irregularly shaped yarns are able to achieve lower shrinkage at lower speeds than round cross section yarns, and from the perspective of equipment capacity. Irregularly shaped threads are more advantageous.

The requirement for 2 is 5000m/+sin ~6000m/w
The spinning speed is in. As is clear from Figure 1, when the spinning speed is less than 5000 m/min, the difference in shrinkage (microstructure difference) becomes large depending on the fineness of the filament, and if the obtained yarn is continuously drawn, the difference in residual stress and shrinkage capacity will increase. The resulting yarn length difference appears, and the resulting drawn yarn has large loops and walnuts, which is undesirable. On the other hand 5000m/min ~ 600m
When the spinning speed is 0 m/min, the shrinkage difference due to the difference in filament fineness can be extremely reduced, and a yarn with almost no drawn yarn loops or walnuts can be obtained.

When the spinning speed is 6000 m/min or higher, the difference in shrinkage rate is drastically reduced and there is no difference in shrinkage. The relationship between spinning speed and shrinkage stress is shown in the second equation. The spinning speed affects both the shrinkage stress and the temperature at which the peak stress occurs, and the higher the spinning speed, the higher the shrinkage stress and the higher the temperature at which the peak shrinkage stress occurs. It is essential to increase the spinning speed in order to obtain sufficient shrinkage stress and high peak latitude, and satisfactory shrinkage stress and peak temperature can be obtained at 5000 m/min or more.

As described in 01I, the shrinkage behavior is influenced by the cross-sectional shape of the filament as well as the relationship between the spinning speed and the contraction center force.
The eleventh objective of the present invention, a mixed fiber yarn, can be achieved only by combining the spinning speed of 0.00 In/min.

However, the shrinkage stress of this yarn is around 0.2 g/d, which is not a sufficient area and requires additional stretching.

FIG. 5 shows the relationship between stretching conditions and shrinkage stress.

Yarn spun at 5000 m/min or more has a shrinkage stress of 0.2
2g/d<2, which is insufficient, and the elongation at break is high, and when it is made into a fabric, it easily flattens and has poor practical properties.

Although the shrinkage stress increases when the main yarn is drawn, the drawing temperature and drawing ratio are lTif and the drawing ratio is 1. 1
1.2 times, and the stretching temperature is 85° C. to 120° C. It is especially necessary to preheat for 3/100 seconds or less.

The stretching ratio is l. If it is less than t times, the shrinkage stress is 0.25g
If /d exceeds 1.2 times which satisfies 1-, jli yarn breakage will occur frequently and operability will be poor. If the stretching temperature is lower than 85°C, shrinkage ↓ will occur, and the force will not be able to reach the low level.
If the temperature exceeds 60°C, the shrinkage rate difference will be small and the desired yarn will not be obtained. In addition, it is preferable that the time period of 8 hours is 3/100 seconds or more, and it is possible to use a so-called direct draw method in which the yarn is stretched after spinning, or a method in which the yarn is stretched in a separate step after being taken up. It is. A detailed explanation will be given in the following examples.

The shapes of the spinning holes used in this example are shown in Table 1.

Table 1 Nozzle hole shape [Method for measuring heat shrinkage rate] The obtained drawn yarn was cut into 50c- lengths, and a load of 1/30 (g/d) was applied to the yarn in the state of multifilament yarn.
After removing the weight, separate each filament into individual filaments on a velvet board. Process the filaments as single filaments in a constant temperature bath at 160°C for 30 minutes without load. After cooling, it becomes one filament. The yarn length was measured under a load of 1/30 (g/d) on one filament, and the shrinkage rate SHD was measured using the following formula.

SHW= (30-Q.)/30xl00 (%)
[Cram school contraction ratio ζ force/! ! How to run? [Left] 20c of drawn yarn
m loop, and using a force measuring device KE-2 manufactured by Kanebo Engineering, apply a 1+:t change of 1/15 (g/d) of the sample denier on the gauge length 10 side to 100'C/t from room temperature. Minute? ．． The dry heat shrinkage stress was determined at a temperature rate, and the stress curve was determined by recording 11 times on an X-Y recorder manufactured by IiI Denki Co., Ltd.

[Degree of irregularity: 7itl+] The sample was encapsulated in acrylic resin, solidified, cut into 5μ thick pieces using a microtome, and photographed using an optical microscope.The resulting film was magnified 20 times and inscribed. The circle and circumscribed rigidity were found and calculated using the following formula.

Degree of irregularity=circumscription 111 +n. Diameter (nus)/inscribed rTI
Diameter (Example) [Example-1] The specific degree of dryness [η] measured at 30'C in a 6/4 mixture of phenol/tetrachloroethane was 0.62.
Polyethylene terephthalate (thioxidized 9 7 0.
0.51'ity% impregnation) was spun at an initial yarn temperature of 290°C.

The nozzle used was 11k gold 1n1 yen, A=6 pieces B=
2 digits C=6 digits D=2 digits E=6 digits F=2 digits G=
2 pieces H=8 pieces J=2 pieces K=2 pieces Spinning a total of 36 holes ``1 gold was used.The thicker threads were placed on the anti-quench side, and the thinner ones were placed on the quench side. The total discharge spear was 28.3 g/min and the quench wind speed was 0.3.
5 rn/see 1 A heat insulating material was placed between the nozzle and the quench box to provide a distance of 35 mm, and winding was performed at a speed of 5100 m/min.

The drawn yarn was drawn by a factor of 1.15 using a hosotrol at 85° C. and a winding speed of 600 m/min. Table 2 shows the physical properties of the drawn yarn obtained.

After weaving the drawn yarn into habutae, it was scoured at 85° C., preset, and subjected to a 22% reduction using caustic soda, followed by dyeing.

The fabric thus obtained was rich in volume, had excellent drapability, had a unique airiness that gave a moderately dry feel, and was full of elasticity and had a soft initial feel.

[Example-2] Stocking at 5100 m/min with a hot roller at 90°C, -
・[[, Real h1 except for stretching without taking over space!
A drawn yarn was obtained by the same method as in Example 1. The physical properties of the yarn are shown in Table 2.

, the fabric obtained from the yarn had an I+i output that was completely comparable to that of Example 1.

[Example-3] The resin used was changed to titanium oxide with a hard resin (viscosity of 0.61), and kaolinite (HUBER Co., Ltd., Hydraglos) was used.
A drawn yarn was obtained in the same manner as in Example 2, except that s 90), and a fabric was obtained in the same manner as in Example 1.

In addition to the unique feel of Example-1, the fabric had a rich warm feel with an extremely emphasized dry feel.

[Length Example-4] At the same time as spinning in the same manner as Example 1, isophthalic acid was added in a separate extruder to 10 mol percent (the laminated copolyester polymer was spun under the same conditions). Separate same-r method Spun yarn with the same arrangement l1 Ill is taken out from gold, and both components are doubled and wound up on a godet roller-L heated to 115°C. The yarn was drawn 15 times to obtain a drawn yarn of 87 denier 72 filaments.

After weaving the yarn, it was subjected to finishing processing in the same manner as in Example-1, and as a result, a fabric superior to Example-1 in both swelling effect and drapability was obtained.

[Comparative Example-1] Using the same polymer as that used in Example-1,
78 holes of φ0.15@m with round cross-section spinning holes, φ0.
The total discharge rate was 40.8 g/min from a spinneret with 23 holes and 24 holes, the yarn was wound at 4000 m/min with a codet roller heated to 95°C, and then stretched to 1.3 times. The physical properties of the yarn are shown in Table 2.

Although the obtained yarn had a satisfactory thermal stress of 0.28 g/d, the drawn yarn had many loops and slacks, and the unwinding property was poor in the weaving preparation process, which caused problems.

In addition, the texture of the obtained Ai has some bulge, but
The fabric had a strong slimy feel and lacked a dry feel.

[Comparative Example-2] A drawn yarn was obtained using the same method as in Example-2, except that the spinning speed was 4500 m/min and the drawing ratio was 1.2 times.

Although the heat strength of the obtained drawn yarn was sufficient, there were many loops and walnuts in the drawn yarn, and the passage PL at the end was poor, which caused problems.

Although the obtained cloth had some bulge, it was somewhat rough and hard.

[Comparative Example-3] After weaving the spun yarn obtained in Example-1 as it is without stretching, there was no particular problem in passability as in F, but the finished yarn had high elongation and shrinkage stress. Because it is low, it easily sag, resulting in a fabric with a rough texture that lacks fullness.

[Comparative Example 4] A drawn yarn was obtained in exactly the same manner as in Example 12 except that the preheating temperature during drawing was set to room temperature, and weaving and dyeing were carried out.

The physical properties of the obtained drawn yarn are shown in Table 2. As a result of the low shrinkage force, the obtained fabric lacked fullness and only had a paper-like texture.

[Comparative Example-5] A drawn yarn was obtained, woven, and finished in exactly the same manner as in the example except that the draw ratio during drawing was 1.05.

Only coarse and hard IIi fabrics with low strength and lack of bulge were obtained from shrinkage fabrics.

[Comparative Example-6] The yarn was discharged under the same conditions as in Example-2, wound up at a spinning speed of 4000 m/min, and stretched 1.15 times at room temperature to obtain a drawn yarn.

Its physical properties are shown in Table 2. As shown in Table 2, although the shrinkage rate was high, the physical properties of the yarn were low in shrinkage stress.

As a result, the fabric obtained lacked fullness and became a very stiff fabric, probably due to the mixture of fibers with a single yarn denier of more than 5d.

[Comparative Example-7] A finished cloth was obtained by spinning and weaving the same thread as in Example-2 except that the preheating temperature during stretching was 100° C. and the stretching ratio was 1.25 times. During drawing, thread breakage, t15, and thread wrapping occurred frequently, resulting in poor operation PL.

In addition, the obtained /+i lacked bulge and had a paper-like texture because the difference in shrinkage rate was small.

Margins below (Effects of the Invention) The differentially shrinkable mixed fiber yarn of the present invention is constructed as described above, and is a mixed fiber yarn that does not produce loops or sag, and has a heat shrinkage stress of 0.25 g/d or more. The maximum contraction force is greater than that of conventional yarns with different contraction conditions. Since it is formed so that the temperature is 60 to 80 degrees Celsius, when it is made into a cloth, it has the unique effect of producing a sufficient swelling effect without inhibiting the development of filaments due to the binding force between the fibers. It is possible to provide a method for stably producing this differentially shrinkable mixed fiber yarn with high productivity.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between the spinning take-off speed using irregularly shaped holes and the dry heat shrinkage rate at 160°C for each fineness. FIG. 2 is a diagram showing the relationship between the yarn take-up rate and the shrinkage stress of the yarn. FIG. 3 is a diagram showing examples of shapes a to e of a slint combination type spinning hole and examples of cross-sectional shapes h to hQ of fibers obtained correspondingly to them, according to the present invention. Spinning take-off speed and 160°C using round-section spinning holes
The relationship between the dry heat shrinkage rate and the fineness is the same as lJ. Figure 5 shows a yarn spun at a spinning speed of 5000 m/min using a irregular hole nozzle, a yarn drawn the undrawn yarn at each draw ratio, and a yarn spun at 1300 m/min at a drawing heat treatment stage. (One side was stretched to 3.1 times using a hot roller at 85°C and then stretched to 3.1 times using a hot plate at 150°C. The other side was stretched to 3.HΔ using a hot roller at 85°C and then without a hot plate. FIG. 3 is a diagram showing the heat shrinkage stress pattern of each yarn obtained by combining the two yarns (stretching). Hit 5d Mouth: 2d Ha 0.5d -1- . Vw = 5500m/win E: V
w = 5000 + s/win ゜ Vw = 4500
m/mIn}: Vw=4000+
s/min: Vv5000m/win undrawn yarn:
Stretching ratio: 1.15 at 25°C: Stretching ratio: 1.15 at 85°C. T: Stretching ratio: 1.15 at 85°C W: Vwl: 300 m/min 3. 1x stretching

Claims (2)

[Claims] (1) Different shrinkage mixed fiber yarn consisting of at least four yarn groups having different shrinkage rates from each other, and among the yarn groups, the single yarn fineness of the thickest single yarn group is 3 to 5. denier, the single yarn fineness of the thinnest single yarn group is 0.3 to 1.5 denier, the dry heat shrinkage stress of the total yarn of the mixed fiber yarn is 0.25 g/d or more, and the maximum shrinkage The stress generation temperature is 65 to 80°C, and the cross-sectional shape of each filament constituting the mixed fiber yarn has a degree of irregularity defined by the diameter ratio of the circumscribed circle and the inscribed circle in the cross section of 1.6 or more. A polyester blend yarn with different fineness and shrinkage. (2) The degree of irregularity defined by the diameter ratio of the circumscribed circle and the inscribed circle is 1.
Melting and discharging a polyester polymer using a spinneret for producing filaments having six or more cross-sectional shapes and having four or more groups of slit combination type spinning holes having different shapes and dimensions, Cooled and solidified by cooling air within 50mm directly below the spinneret, and
The polyester is taken up at a take-up speed of 1.5 minutes, and after being wound up once or without being wound up, it is subsequently preheated at 85 to 120°C and then stretched at a draw ratio of 1.1 to 1.2 times. A method for producing a mixed fiber yarn with different shrinkage.