JP2820997B2 - Mixed yarn with small protrusions and slack - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mixed fiber having a protrusion, such as a loop or a curl, and an irregular slack on the surface of the yarn.

(Prior Art) Conventionally, polyester filaments have started from a simple straight shape, and various ideas have been devised in order to obtain the fullness of the yarn. One is a silk-like field that has a slack while being a straight filament, the second is a processed yarn or a structural yarn that has a crimp and a slack, and the third is a loop or curl on the yarn surface. This is the field of providing protrusions.

(Problems to be Solved by the Invention) Conventionally, a drawn yarn having a protruding portion has been produced by subjecting a multifilament to a disturbance fluid treatment. Such a drawn yarn has a drawback that the unwinding property from cheese or pan is poor. This is because the protruding portion has a large fastener effect between the yarns and a large frictional resistance when rubbing the surface of the wound yarn, and as a result, the yarn breaks. In order to solve this drawback, various devices have been devised to reduce the protrusion as disclosed in JP-A-63-196732 and JP-A-63-182433. However, since these have reduced protrusions, the space between fibers is less diversified, and is inferior in natural swelling feeling.

An object of the present invention is to provide a mixed fiber yarn having good unwinding properties, good twistability and good weaving process passability, and excellent swelling feeling.

(Means for Solving the Problems) That is, the present invention relates to a mixed fiber having a core-sheath structure,
At least one of the core yarn and the sheath yarn contains three or more leaves of irregular cross-section fibers, and a part of the sheath yarn has a projection coefficient (projection height / projection width) of 0.5 to 2.5, and a projection height. Has two or more protruding portions that are 1/3 or more of the diameter of the mixed fiber per 25 mm of the mixed fiber length, and a plurality of single fibers with different phases and a height equal to or larger than the mixed fiber diameter. A fiber having an irregular slack having a width of at least twice the width of 25 mm or more per 25 mm of the mixed fiber length and a yarn length difference (L ₀ ) determined by the following which is 10% or less: It is a thread.

Yarn length difference (L ₀ ): Approximately 1 m is collected excluding the twist of the mixed fiber.
Make a knot at both ends, measure its length (l ₁ ), and then separate the core yarn from the sheath yarn so as not to stretch the sheath yarn with a needle. When the knot is completely divided from the knot to the knot, the length (l ₂ ) of the sheath thread side is measured, and L ₀ is obtained from the following equation.

L ₀ = (l ₂ −l ₁ ) / l ₁ The main features of the present invention are that three or more irregularly shaped fibers are used for at least one of the core yarn and the sheath yarn. Shape, size, intermingling in the length direction, and irregular and not so large slack.

In the present invention, the protruding portion is a generic term for a portion protruding outward from the yarn such as a loop or a curl. It is desirable that the shape and size are not constant but various. Due to the diversification of the shape and size of the protrusion, a natural rounded texture is created. Also,
The protrusion which exhibits a substantially high effect is a shape-shape, and as shown in FIG. 1, a value of (protrusion height) / (protrusion width) (this is defined as a protrusion coefficient). Is a big thing. Specifically, the protrusion coefficient is 0.5 to 2.5, preferably 0.7 to 2.0, and the height thereof is 2/3 / 25mm or more, preferably 5 / 25mm, when the height is 1/3 or more of the mixed fiber thread diameter. That is what we have. By satisfying this condition, the texture and handleability of the woven or knitted fabric are improved.

In the present invention, the height, width, and diameter of the projecting portion are set so that the measuring portion does not touch the object.
The maximum height, maximum width, and individual protrusion of each protrusion observed when the yarn tensioned at 0.05 g / d is projected onto the magnifying projector and the yarn is rotated along the yarn axis. It shows the average diameter of the yarn near the portion where the portion is formed (No. 1).
See figure).

In order to impart a natural swelling to the woven or knitted fabric, it is important that the sheath yarn is mixed and entangled with an irregular slack having an unequal length with respect to the core yarn, in addition to the above items.

In the present invention, irregular sag means that a plurality of single fibers have different phases and a height equal to or greater than the yarn diameter, and the height is equal to 2 mm.
It is a "slack" with a width more than twice that of the "slack"
Exist at one place / 25 mm or more. Here, the height means the maximum height of the slack, and the width indicates the length of the base of the isosceles triangle whose height is the maximum height. Irregular sag can be conveniently measured based on the isosceles triangle.

Different shrinkage blended yarns that do not have sag at the stage of drawn yarn, as in the past, have a uniform and small sag even after shrinkage treatment because the warp is bound to the weft and the weft is bound to the warp in the woven fabric. On the other hand, the mixed fiber of the present invention has a random yarn length difference at the drawing yarn stage, so that it is less likely to be restrained in the woven fabric, and has a more irregular and large slack.

In order to obtain excellent swelling in the woven fabric, the weft needs to overcome the binding force of the warp and the warp must overcome the restraining force of the weft, causing a difference in shrinkage. (L ₀ ) is desirably 0.5 to 10%.

If L ₀ is 0.5% or less, sufficient swelling cannot be obtained. On the other hand, if L ₀ is 10% or more, loops and sagging are too large, and the processability deteriorates, which is not preferable. Then, in order to actually obtain excellent swelling as a fabric such as a woven fabric, the fabric must have a yarn length difference after heat treatment. Therefore combined filament yarn of the present invention is 98 ° C., the yarn length difference L ₁ after heat treatment under a load of 0.5 g / d has a yarn length difference 0.2 to 5%.

L ₁ is meant yarn length difference in binding under an external force and in the fabric undergoes during the treatment process to combined filament yarn is woven, that is, the contraction force. L ₁ load of 0.5 g / d at the time of measurement is obtained by assuming the binding force in the sizing tension humidity during dyeing heat treatment tension and in textiles. The sizing conditions vary depending on the brand of yarn, the physical properties of the yarn, and the woven fabric standard. In particular, the sizing tension varies depending on the physical properties of the yarn, the yarn speed, the temperature at which the yarn is felt, and the like. Ultimately, draft adjustment in the chamber (glue dryer) must be performed to adjust to the appropriate tension, but generally it is 0.25 g / d or less for polyester filament. Thus, shrinkage after passing through the constant length heat treatment step cannot be expected unless it has a potential shrinkage force that exceeds a sizing tension of at least 0.25 g / d.

Next, another major factor that causes the shrinkage force of the mixed fiber to be lost is the binding force of the warp or weft in the woven fabric. This binding force also varies depending on the fineness of the yarn used, the boiling water shrinkage, the fabric structure, and the density. This binding force is statistically expressed by equation (1).

F: Binding W _{1: 1} / 20g / d of boiling water shrinkage percentage under load W _2: Actual boiling water shrinkage percentage in the weave in here W ₂ is finishing the greige width or raw captain width or finish length a value obtained by subtracting the wave weaving from the difference between, is less than about half of the usual W _1. Statistically, this binding force is 0.24g /
d or less. Therefore, in order to make use of the difference in shrinkage on the woven fabric and to exhibit the sag, it is necessary to potentially have a shrinkage force exceeding at least the sizing tension + binding force, that is, at least 0.49 g / d or more, and in addition, dyeing Considering the wet heat treatment tension at the time, a shrink force of 0.5 g / d or more is required to obtain good swelling in the woven fabric targeted by the present invention. Therefore, under such tension conditions, L ₁
If less than 0.2%, sufficient swelling cannot be obtained. Also L ₁
Is more than 5%, which is undesirable.

In the present invention, the yarn length difference is measured by the following method. First, about 1m is collected excluding the twist of the mixed fiber. Make a knot at both ends and measure its length (l ₁ ). Next, the core yarn and the sheath yarn are separated while being careful not to stretch the sheath yarn with the needle. When the knot is completely separated from the knot, the length (l ₂ ) of the sheath thread side is measured. Yarn length difference L ₀ or L ₁ is obtained by equation (2).

L ₀ or L ₁ = (l ₂ −l ₁ ) / l ₁ (2) In the mixed fiber of the present invention, these projections and the fibers may not be displaced from each other in order to keep the irregular slack. It is important that a stop point or stop is needed.
It is also necessary that the stopping force be large. In the present invention, the action relating to these stoppers is due to mixed fiber entanglement. In particular, since the sheath yarn and the core yarn are mixed entangled at the base of the projecting portion, the projecting portion and irregular slack are generated in the post-processing. Is effectively retained without disappearing, and a product having a natural swelling is obtained. If the number of such mixed entanglements is too small, the effect as a stopper cannot be sufficiently exerted, so that it is preferable that one or more of the mixed entanglements exist in 50 mm. Further, the loss of the protruding portion in the post-processing step is so large that the strength of the entanglement is weak, and the confounding property is 3 as a fiber shape.
It is preferable to use fibers having a cross section of more than a leaf, in particular, a three-lobe cross section. Furthermore, the irregular cross-section fiber having three or more leaves may be used for at least one of the core yarn and the sheath yarn, but the use of the sheath yarn provides more preferable results. In addition, the strength of the intermingling can be controlled by the excess supply rate and the fluid pressure for fluid treatment. In the present invention, the sheath yarn is fed at a larger oversupply rate due to the excess supply rate of the core yarn,
The entanglement strength is increased while forming a protruding portion such as a curl and a portion having an irregular sag.

In the present invention, in order to maintain and increase the irregular slack, it is necessary that the contraction rate of the core yarn is larger than that of the sheath yarn. The difference in boiling water shrinkage between the core yarn and the sheath yarn is 10
% Or more, especially 15% or more gives more favorable results. Preferably, the core yarn has a boiling water shrinkage of 15% or more, and the sheath yarn has a boiling water shrinkage of 5% or less.

The polymer constituting the mixed fiber of the present invention is polyester,
Although there is no particular limitation, such as polyamide, a polyester mainly composed of ethylene terephthalate units is preferably used.

Next, a method for producing the mixed fiber of the present invention will be described. FIG. 2 is a schematic diagram showing one example of the above. A core yarn A unwound from a core yarn package 1 is supplied to a Taslan nozzle 5 forming a compressed air turbulent flow area via a core yarn supply roller 3. .

On the other hand, the sheath yarn B unwound from the sheath yarn package 2 is supplied to the Taslan nozzle 5 via the sheath yarn supply roller 4.

The two yarns A and B that have passed through the Taslan nozzle 5 are subsequently supplied to the first heating roller 6 and the second heating roller 7, and are taken up by the take-up roller 9 via the take-up roller 8.

Here, the core yarn A has a boiling water shrinkage of 15% as described above.
As described above, it is preferable to use a filament yarn of single fiber denier of 1.5 to 6 denier, preferably 3 to 6 denier. As the sheath yarn B, the single-fiber denier having a boiling water shrinkage of 5% or less is finer than the core yarn. It is preferable to use a filament yarn of 0.5 to 2.0 denier. This is because when the single fiber denier of the sheath yarn becomes thick, it becomes difficult to form a fine loop and the feeling becomes hard.

These yarns are supplied to the Taslan nozzle 5 at different overfeed rates, but the compressed air pressure is 4 to 10 kg / cm ^2.
Degree is preferable, and the overfeed rate of the core yarn is 2 to 20.
%, And the overfeed rate of the sheath yarn is preferably 5 to 30%. In particular, it is desirable that the sheath yarn is supplied at an overfeed rate higher than the core yarn by 3% or more.

Incidentally, the overfeed rate (OF) in the present invention is defined by the surface speed of the supply rollers 3 and 4 as V ₁ and the surface speed of the take-up roller 8 as V _2. It is represented by

In particular, it is important to perform the Taslan treatment with air in order to obtain the protrusions and irregular slack in the mixed fiber of the present invention. In the case of Taslan using water, a projecting portion such as a loop appears, but irregular slack cannot be obtained, and the mixed fiber of the present invention cannot be obtained. In the present invention, after performing the Taslan treatment by air, the first
Heat treatment is performed at about 80 to 120 ° C. with a heating roller, where protrusions such as loops and irregular slack are formed. Then, it is guided to the second heating roller while applying a tension of 0.7 g / d or more as necessary, where the loop and irregular slack are further developed.

The core yarn A, which is a raw material of the mixed fiber of the present invention, is not particularly limited as long as it has a high shrinkage ratio of boiling water of 15% or more.
It can be obtained by a known method. For example, it can be obtained by appropriately stretching a product obtained at a spinning speed of 4,000 to 4,500 m / min. As the sheath yarn B, a conventionally known DSY or the like having a boiling water shrinkage of 5% or less can be used.

(Examples) Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited thereto.

Examples 1 to 3 Using the apparatus shown in FIG. 2, mixed yarns were prepared according to the core yarn, the sheath yarn, and the processing conditions shown in Table 1.

In the obtained mixed fiber, the protrusion having a protrusion coefficient of 0.5 to 2.5, and the protrusion having a height of 1/3 or more of the yarn diameter is 3.2 pieces / 2.
5mm (Example 1), 5.3 / 25mm (Example 2), 2.4 / 25m
m (Example 3), where a plurality of single fibers are different in phase and have a height equal to or greater than the diameter of the mixed yarn, and irregular slack having a width of twice or more the height is 5/25 mm (Example 3). 1, 3), 7/25
mm (Example 2), and the average yarn length difference (L ₁ ) between the core yarn and the sheath yarn is 1.2% (Example 1), 4.5% (Example 2), 0.2%
% (Example 3). This mixed fiber had good twisting and weaving process passability, and the obtained woven fabric had natural swelling and touch.

Example 4 A mixed fiber was prepared under the same conditions as in Example 1 except that the types of the core yarn and the sheath yarn were changed to those shown in Table 1. The obtained mixed yarn has a protrusion coefficient of 0.5 to 2.5, and the protrusion having a height of 1/3 or more of the yarn diameter is 3.2 pieces / 2.
It was 5 mm, irregular sag was 5 pieces / 25 mm, and the average yarn length difference (L ₁ ) between the core yarn and the sheath yarn was 1.1%. This mixed yarn had good twisting and weaving process passability, and the obtained woven fabric had a natural swelling, soft touch and tightness.

Example 5 A mixed fiber was prepared by setting the types of the core yarn and the sheath yarn and the processing conditions as shown in Table 1. In the obtained mixed fiber, 0.5
The protruding portion has a protruding portion coefficient of ~ 2.5, the protruding portion having a height of 1/3 or more of the yarn diameter is 3.2 pieces / 25 mm, and the irregular slack is 5
K / 25 mm, and the average yarn length difference (L ₁ ) between the core yarn and the sheath yarn was 1.1%. This mixed yarn had good twisting and weaving process passability, and the obtained woven fabric had a natural swelling, soft touch and tightness.

Example 5 A mixed fiber was prepared by setting the types of the core yarn and the sheath yarn and the processing conditions as shown in Table 1. In the obtained mixed fiber, 0.5
With a protrusion coefficient of ~ 2.5, protrusions with a height of 1/3 or more of the yarn diameter are 4.3 pieces / 25mm, irregular sag 5 pieces / 25m
m, the average yarn length difference (L ₁ ) between the core yarn and the sheath yarn was 1.6%. This mixed yarn had good twisting and weaving process passability, and the obtained woven fabric had a natural swelling, soft touch and tightness.

Comparative Example 1 A mixed fiber yarn was prepared using the core yarn and the sheath yarn of Example 2 under the processing conditions shown in Table 1.

This is the one in which the difference from the core yarn is fed at the same speed and subjected to the fluid turbulent flow treatment.
With the above-mentioned protrusion coefficient, the protrusion having a height of 1/3 or more of the yarn diameter is 0.5 pieces / 25mm, and the irregular sag is 0 pieces / 25m.
m, the yarn length difference between the core yarn and the sheath yarn was 0. Although the twisting yarn and the weaving process passability were good, the obtained woven fabric had poor swelling.

Comparative Example 2 Using the core yarn and the sheath yarn of Example 4, a mixed fiber was prepared under the processing conditions shown in Table 1. In this example, an interlaced nozzle (pressurized air pressure 4.0 kg / c
m ² ) to perform fluid turbulence treatment.

The obtained mixed fiber had no protrusions and irregular sag, and the difference in length (L ₁ ) between the core yarn and the sheath yarn was 0%. Twisted yarn,
The weaving process had good passability, but the natural swelling and soft touch of the woven fabric were poor.

(Effect of the Invention) Since the mixed fiber of the present invention has both small protrusions and irregular slack, it has a natural swelling as compared with the conventional loop yarn, and furthermore, they are post-processed. Therefore, the woven or knitted fabric to be produced has a more natural feel.

[Brief description of the drawings]

FIG. 1 is a schematic view of a side surface of a drawn yarn of the present invention. l indicates the width of the small protrusion, h indicates the height of the small protrusion, and d indicates the yarn diameter. A indicates an irregular sag portion. FIG. 2 is an example of an apparatus for obtaining the mixed fiber of the present invention. 1; core yarn package, 2; sheath yarn package, 3; core yarn supply roller, 4; sheath yarn supply roller, 5; Taslan nozzle, 6; first heating roller, 7; second heating roller, 8; take-up roller, 9; Winding roller, A; Core thread, B; Sheath thread

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-102436 (JP, A) JP-A-56-9435 (JP, A) JP-A-58-191236 (JP, A) JP-A-63-1984 243346 (JP, A)

Claims (1)

(57) [Claims] In a mixed fiber having a core-sheath structure, at least one of the core yarn and the sheath yarn contains fibers having irregular cross-sections of three or more leaves, and a part of the sheath yarn has a projection coefficient (projection height). / Projection width) is 0.5 to 2.5, and the height of the projection is 1/3 of the diameter of the mixed fiber
Irregularities having two or more protruding portions per 25 mm of the mixed fiber length, a plurality of single fibers having different phases and a height equal to or larger than the mixed fiber diameter, and a width equal to or more than twice the height. A mixed fiber having a sag at one or more locations per 25 mm of the mixed fiber length and a yarn length difference (L ₀ ) determined by the following method of 10% or less. Yarn length difference (L ₀ ): Approximately 1 m is collected excluding the twist of the mixed fiber. Make a knot at both ends, measure its length (l ₁ ), and then separate the core yarn from the sheath yarn so as not to stretch the sheath yarn with a needle. When the knot is completely divided from the knot to the knot, the length (l ₂ ) of the sheath thread side is measured, and L ₀ is obtained from the following equation. L ₀ = (l ₂ −l ₁ ) / l ₁