JPH07331549A - High-tenacity fluffed yarn and its production - Google Patents

Abstract

PURPOSE:To obtain high-tenacity fluff yarn useful as a material for clothing having handle of peach skin touch and liveliness and a material for sewing thread, having excellent unwinding properties, smoothness, sewing properties and seam strength. CONSTITUTION:Plural polyester multlfilament yarn Y which comprises total twenty or more of filaments of single yarn having 0.1-1.5 de fineness of single yarn and weak yarn tenacity and filaments of single yarn having 3.5-10 de fineness of single yarn and strong yarn tenacity and is subjected to first twist in the Z direction are arranged and wound to give a bobbin l, which is fitted to a rotary spindle 2 of an uptwister. The yarn Y is drawn out to feed rollers 4, provided with ply twist in the S direction, then traveled between the feed rollers 4 and take-off rollers 6 in a stretched state at <=50m/minute speed and wound through guide rollers 9 and 11 on a guide 5. The yarns Y in the outward trip side and the way back side are crossed each other, provided with twist and friction, the filaments having low fineness are cut and the yarn is fluffed to give the objective fluffed yarn which has >=830 fluffs with <=1mm length/m amounting to >=90% the total number of the fluffs and has >=4.5g/d strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength fluff yarn of multifilament yarn having a large number of short fluff of 1 mm or less on the surface while having high tenacity and a method for producing the same.

[0002]

2. Description of the Related Art Hitherto, many attempts have been proposed to achieve the bulkiness and fluff feeling of spun yarns by using multifilament fluff yarns. The present inventors have previously proposed, as one of such proposals, by winding a multifilament yarn provided with a lower twist and an upper twist on a guide, and crossing the forward yarn and the backward yarn. A method has been proposed in which fluff is generated in the multifilament yarn by twisting and handling, and a fluff yarn obtained therefrom (see Japanese Patent Laid-Open No. 3-64546, etc.).

The multifilamentary fluff yarn thus obtained has very little change in yarn strength and thickness unevenness in the yarn longitudinal direction as compared with other conventional proposals, and has a relatively short fluff length and crimp. It had an excellent point that it could be a high quality product that does not cause pilling or pilling. In addition, the multifilamentary fluff yarn obtained by the above method has a higher texture of peach skin touch for clothing as the number of fluffs is increased, and when it is used as a sewing thread, it is unwound from the corn. It had the property of increasing the smoothness with needles and fabrics and improving the sewability.

However, since the multifilamentary fluff yarn has an inverse correlation that the yarn strength decreases as the number of fluffs increases, the multifilamentary fluff yarn obtains the above-mentioned characteristics associated with the increase in the number of fluffs while maintaining high tenacity. I couldn't say that.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high tenacity fluff yarn having a high tenacity and a large number of short fluffs of 1 mm or less on the surface. Another object of the present invention is to provide a manufacturing method for obtaining such a high tenacity fluff yarn.

[0006]

In the high tenacity fluff yarn according to the present invention for achieving the above object, a single yarn filament having a small yarn strength and a single yarn filament having a large yarn strength are mixed to form a lower twist and an upper twist. It is a multi-filament yarn that has been applied, and mainly the single yarn filament with high yarn strength is continuous fiber shape, while the single yarn filament with low yarn strength is cut into short fiber shape, and the cut end thereof is the multi-filament. A large number of fluffs protrude from the surface of the filament yarn, and the number of fluffs with a length of 1 mm or less is 830 /
It is characterized in that it is m or more, occupies 90% or more of the total number of fluffs, and the yarn strength of the multifilament yarn is 4.5 g / d or more.

As described above, the multifilamentary fluff yarn has an inverse correlation in that the yarn strength decreases as the number of fluffs increases, but as described above, the multifilament yarn is composed of a single yarn filament having a small yarn strength and a yarn strength. It is composed of at least two types of large single-filament filaments, and the single-filament filaments having large yarn strength are held in a continuous fiber form as a yarn-strength component, while the single-filament filaments having small yarn strength are shortened as a fluff component. The thread strength to 4.
It is possible to increase the number of fluffs to 830 fibers / m or more while maintaining high strength of 5 g / d or more.

The method for producing such a high tenacity fluff yarn according to the present invention is a multifilament in which a single yarn filament having a small yarn strength and a single yarn filament having a large yarn strength are mixed and subjected to a lower twist and an upper twist. Running speed of 50m
The yarn strength is mainly obtained by wrapping the yarn around the guide while traveling at a speed of not more than 1 minute / min, and by twisting the yarn on the outward path toward the guide and the yarn on the inward path returning from the guide to twist and handle. The filaments are cut into short fibers to generate fluff on the surface of the yarn.

As described above, the multifilament yarn as a starting material is composed of at least two types of single yarn filament having a low yarn strength and single yarn filament having a high yarn strength, and is wound around a guide to cause yarn-yarn friction. Since the traveling speed at the time of imparting the twist and the handle by 50 m / min or less, the instantaneous frictional heat can be suppressed, and the yarn strength can be hardly reduced. Also,
Since the entire surface of the yarn is evenly rubbed, no difference in dyeing occurs, and the amount of white powder generated during rubbing can be reduced.

A detailed description will be given below with reference to the drawings. FIG. 1 shows an example of a high tenacity fluff yarn according to the present invention. The high-strength fluff yarn 50 is based on a multifilament yarn 51 made of a thermoplastic synthetic polymer, and a large number of fluffs 52 are projected on the surface thereof. The multifilament yarn 50 is formed by aligning two or more lower warp yarns and subjecting them to the upper twist. Further, the multifilament yarn 50 is composed of a single yarn filament (or a fineness single yarn filament) having a low yarn strength and a single yarn filament (or a large fineness single yarn filament) having a high yarn strength mixedly, of which mainly the yarn The high-strength single-filament filaments are maintained in a continuous fibrous shape, but the low-strength single-filament filaments are cut into short fiber shapes, and the cut ends are restrained by the lower twist and the upper twist and protrude as fluff 52. ing.

In such a structure, the yarn strength of the fluff yarn 50 is 4.5 g / d or more, preferably 4.5 to 5.5 g.
The fluff 52 has a high tenacity of / d and a short length of 1 mm or less occupies 90% or more of the total number of fluff, and the short fluff is 830 pieces / m or more, preferably 830 to 10
It is also equipped with 00 / m. The fluff yarn thus configured has a large number of extremely short fluffs having a fluff length of 1 mm or less at 830 pieces / m or more and a yarn strength of 4.5.
Since it has a high strength of g / d or more, it can give a soft and moist touch of peach skin touch when used for clothing, and an excellent solution from the corn when used as a sewing thread. The sewability can be improved by exhibiting the setting properties and the excellent smoothness for the needles and the cloth.

[0012] In addition, since the fluff is formed from single filament filaments of small fineness with high yarn strength, and fluff is formed from single filament filaments of large fineness with large yarn strength, it is used for clothing. When using the
Has the effect of enlarging the waist and the waist, and when used for sewing threads, it improves the strength of the seam as a high-strength sewing thread.
Make it hard to tear.

In the high tenacity fluff yarn of the present invention, the material thereof is a synthetic polymer, and among them, thermoplastic synthetic polymers such as polyester and nylon are preferable materials.
In the present invention, the fineness per multifilament yarn constituting the fluff yarn is preferably in the range of 10 to 500 denier. Particularly, in the case of polyester multifilament yarn, the range of 30 to 100 denier is preferable. The single yarn filaments that make up the multifilament yarn are
The cross-sectional shape may be circular, or may be irregular, such as triangular, Y-shaped, pentagonal, hollow, or flat. Also,
Special varieties such as high-gloss and low-gloss yarns can also be used.

In the present invention, the fluff yarn is composed of at least two types of single yarn filament having a low yarn strength and single yarn filament having a high yarn strength. The difference in yarn strength is generally a denier difference between filaments of the same material. It is better to configure by. Of course, as long as the two types of filaments have a difference in yarn strength, they may have the same denier structure.

When configured as a denier difference, the fineness (thickness of yarn) of a single filament is 0.1 to 1.
Within the range of 5 denier, the fineness (thickness of the yarn) of single filament filament is set within the range of 3.5 to 10 denier, and the difference in fineness between them is at least 2 denier. These two types of single yarn filament,
In the fluff yarn, a thick (high yarn strength) single yarn filament is maintained in a continuous fiber shape, but a thin (low yarn strength) single yarn filament is cut into short fibers.
The fiber length made into a short fiber is not particularly limited,
It is desirable to set it in the range of 25 to 280 mm. It is desirable that the short fiber lengths have a random distribution without being biased only to those having a specific length.

The number of constituent filaments per multifilament yarn constituting the fluff yarn is 20 or more, preferably 20 to 150. If the number of components is less than 20,
It becomes difficult to bring the number of fluffs to the level of 830 pieces / m 2 or more required in the present invention. The ratio of the number of monofilament filaments having a large fineness to be maintained in a continuous fibrous state and the number of single filament filaments having a fineness to be shortened is 5 to 50%, whereas the latter is 50 to 50%. 95% is recommended. The larger the number of components in such a configuration,
Further, the number of fluffs can be increased as the proportion of the number of single filaments of fineness is increased.

The twist applied to the fluff yarn of the present invention may be appropriately set in the twist direction and the twist number so that the lower twist number and the upper twist number maintain a torque balance. Preferably, the lower twist direction and the upper twist direction are opposite to each other, and the upper twist number is preferably in the range of 60 to 90% of the lower twist number. As a method for producing the high tenacity fluff yarn of the present invention described above, a multifilament yarn in which a single yarn filament having a small yarn strength and a single yarn filament having a large yarn strength are mixed and subjected to lower twist and upper twist , Traveling speed 50m /
It is advisable to wind the yarn on the guide while traveling for less than a minute, and to twist and handle by twisting the yarn on the outward path toward the guide and the yarn on the return path returning from the guide. The step of applying twist and handling through the guide may be performed after the lower twisting, the aligning, the upper twisting, the rewinding before and after dyeing, or the like.

2 and 3 exemplify a case where the manufacturing method of the present invention is carried out in a step after twisting. FIG. 2 is applied to a twisting machine called an up twister or a covering machine, an italian twisting machine, a double twister, etc., and 1 is a plurality of filament yarns twisted downward in the Z direction and aligned and wound. It was Bobbin. Here, each of the twisted filament yarns is composed of a single yarn filament having a low yarn strength and a single yarn filament having a high yarn strength.

The number of lower warp yarns to be aligned may be any number as long as it is 2 or more, but it is preferable to scoop it into an odd number of yarns such as 3 or 7 so that the yarns can be balanced. In this case, as the lower twisted yarn, different kinds of yarns may be aligned, non-twisted yarns may be aligned, or yarns having different lower twist directions may be aligned in a special combination. A bobbin 1 around which a yarn Y in which a plurality of lower twisted yarns are aligned is wound is supported by a spindle 2 and is rotationally driven by a frictional force of a belt 3. When the yarn Y is pulled out to the supply roller 4 in the axial direction of the bobbin 1 while rotating the bobbin 1 in this manner, the yarn Y is given an upward twist in the S direction (or Z direction).

The yarn Y having the upper twist inserted therein is wound around the guide 5 while traveling in a tension state between the supply roller 4 and the take-up roller 6. Moreover, in this winding, as shown in detail in FIG. 3, the yarn Ya on the outward path toward the guide 5 and the yarn Yb on the return path returning from the guide 5 are intersected at the point P, and both yarns Ya , Yb is given a strong twist and handle to perform thread-thread scraping.

In the above-mentioned crossing process, the yarn Ya on the outward path is twisted with 90 ° by intersecting the yarn Yb on the backward path, and the yarn Yb on the outward path is also applied to the yarn Yb on the outward path.
A 90 ° twist is given by intersecting with. Therefore, when the multifilament yarn Y passes back and forth through the intersecting point P, a total twist of about 180 ° is given. The multifilament yarn Y has the intersection P
When the surface is handled while being twisted by, the single-filament filament having a fineness is mainly cut and fluffed to form a large number of fluffs on the surface.

In such a crossing process, the twisting direction may be either the S twist direction or the Z twisting direction, but in order to stabilize the twisting and handling action at the crossing point P, the pin 10 is provided inside the crossing point P. Alternatively, a roller may be arranged. More preferably, the guide roller 9 or the pin is arranged on the supply side of the intersection point P, and the guide roller 11 or the pin is arranged on the exit side, and the latter is moved in the direction of the arrow to enter the yarn. It is also possible to change and adjust the entrance / exit angle θ formed between the side and the exit side.

In the present invention, the tension applied by the crossing treatment is preferably 0.2 g / d or more on both the return path and the outward path. The twist imparted by the crossing treatment is 180 ° or more, and more preferably 360 ° or more. By imparting a twist of 180 ° or more in this way, it is possible to frictionally contact more than half of the outer circumference of the yarn with the yarn on the other side, so that the single-filament filament on the fineness side is cut in the longitudinal direction of the yarn. It can be randomized between single yarns. In addition, the randomization of the cutting eliminates thread streaks and makes it more uniform.

What is important in the manufacturing method of the present invention is that
This is to set the traveling speed of the yarn Y at the time of crossing treatment to 50 m / min or less. In the thread-thread rubbing process, instantaneous frictional heat is generated due to rubbing, which causes the filament to become brittle or scraped, so that the thread strength of the filament is reduced. In addition, only a specific side surface of the filament may be rubbed due to high speed running, and when dyed, the rubbed portion becomes a light color, which causes deterioration of yarn quality.

In the present invention, since the running speed is suppressed to 50 m / min or less, the instantaneous frictional heat is suppressed and the yarn strength is hardly reduced. In addition, since the multifilament yarn is twisted or inverted naturally, the entire surface of the yarn is uniformly rubbed and no dyeing difference occurs. Further, the amount of white powder generated when the thread is rubbed is reduced due to the slow rubbing speed, and troubles to the subsequent steps can be eliminated.

[0026]

EXAMPLES In the following examples and comparative examples, the number of fluffs, the yarn strength, and the fiber length of short fibers were measured as follows. <Number of fluffs> Fluff measuring device `` HAIRINESS COUNTER MODEL DT-1
0 "(manufactured by Toray Engineering Co., Ltd.)
Measure the number of fluff less than 1 mm at a yarn speed of 50 m / min for 1 minute,
The maximum number of fluffs converted per 1 m was adopted.

<Yarn Strength> The yarn strength was measured by the method specified in JIS L-1073. <Fiber length of short fiber> The upper twist and the lower twist of the triple twist yarn were untwisted, and the fiber length of each short fiber when decomposed into short fibers was measured.

Example 1 A polyester multifilament of 70 denier and 42 filaments (6 denier has 6 filaments and 1 denier has 36 filaments) and 3 lower warp yarns subjected to 900 T / m in the S direction.
The yarns were aligned and subjected to a twist of 600T / m in the Z direction to form a triple twist yarn.

The triple twist yarn is wound around the guide roller as shown in FIG. 3 under a high tension of a traveling speed of 10 m / min, a forward tension of 200 g and a backward tension of 480 g by the up twister manufacturing process shown in FIG. Then, the yarn on the outgoing side and the yarn on the returning side were crossed, and twist and handle of about 360 ° were applied to produce a fluff yarn. The characteristics of the obtained fluff yarn were as follows.

Fluff length 0.1-1.0 mm (100% of all fluff was less than 1 mm) Fiber length of short fibers 126 mm on average (up to 300 mm,
Minimum 25 mm) Strength (strength) 1050 g (5.0 g / d) Strength fluctuation rate (CV) 3.5% Number of fluff 840 / m When the obtained fluff yarn was decomposed, 6 denier single filaments were obtained. Both were not made into short fibers, but 1
All 36 denier single-filament filaments were made into short fibers. Further, the fiber lengths of different lengths which have been shortened have a distribution as shown in FIG. 4, and the number of each fiber length is relatively uniform.

When the obtained fluff yarn was dyed and finished and then evaluated as a sewing yarn, it was found that the sewability was extremely good and the finish of sewing was good. Example 2 In order to obtain a fluffy yarn having a yarn strength of 4.5 g / d and 5.5 g / d, the conditions of the outward route tension and the backward route tension in Example 1 were set as follows: the outward route tension of 250 g / the backward route tension of 550 g. The fluff yarn was manufactured by changing two levels of the side tension of 150 g / return side tension of 450 g. When the relationship between the yarn strength and the number of fluffs of the two levels of fluff yarn obtained in this example and the fluff yarn obtained in Example 1 is plotted in FIG. 5, the result is as in the example of the present invention.

On the other hand, for comparison, according to the conventional method, 70
Denier, 42-filament polyester multifilament (42 total number is 1.7 denier), S
Align 3 lower yarns with 900 T / m direction,
This was subjected to a twist of 600 T / m in the Z direction to form a triple twist yarn. From this Sanko warp yarn, the yarn strength of 4.5 g / d, 5.0 g / d, 5.5 g /
In order to obtain the fluff yarn of d, the conditions of the outward-side tension and the backward-side tension are as follows: forward-side tension 230 g / return-side tension 530 g, forward-side tension 180 g / return-side tension 450 g, forward-side tension 130
The fluff yarn was manufactured by setting the conditions of 3 levels of g / return side tension of 430 g.

When the relationship between the yarn strength and the number of fluffs of each of the three types of fluff yarns obtained was plotted in FIG. 5, the result was as shown as a conventional example. That is, it is understood that when the yarn strength is increased, a sufficient number of fluffs cannot be obtained. Comparative Example In Example 1, only the yarn traveling speed was 60 m /
Min, 100 m / min, and 200 m / min, and fluff yarn was manufactured.

Thread strength level is 1050 to 1100 g
(5.0 to 5.2 g / d), but each has a length of 1
The number of fluffs of mm or less was 750 / m or less. Also,
The occurrence of white powder and shavings was large, and the difference in dyeing after dyeing was also larger as the yarn running speed was higher.

[0035]

The fluff yarn according to the present invention is composed of at least two types of single yarn filament having low yarn strength and single yarn filament having high yarn strength, and the single yarn filament having high yarn strength is continuously used as a yarn strength component. On the other hand, while the filament is made into a fibrous shape, the single yarn filament having a small yarn strength is made into a short fiber as a fluff component, so that the number of fluff can be extremely increased while the fiber has a high tenacity.

Therefore, when it is used for clothing, it can be made soft and moist to the touch of peach skin, and the texture of "tension" and "waist" can be increased. In addition, when the sewing thread is used, it exhibits excellent unwindability from the cone, excellent smoothness with respect to the needle and cloth, and can improve the sewability. Can be improved. .

Further, in the production method according to the present invention, a multi-filament yarn composed of at least two types of a single yarn filament having a low yarn strength and a single yarn filament having a high yarn strength is wound around a guide and is subjected to yarn-thread friction. When twisting and handling, the running speed is set to 50 m / min or less, so that instantaneous frictional heat can be suppressed, and the number of fluffs can be increased with almost no decrease in yarn strength. Further, since the entire surface of the yarn is evenly rubbed, no difference in dyeing occurs, and the amount of white powder generated during rubbing can be reduced.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an example of a high tenacity fluff yarn of the present invention.

FIG. 2 is a schematic view showing a production process of the high tenacity fluff yarn of the present invention.

FIG. 3 is an explanatory view showing an enlarged thread-yarn crossing portion in the manufacturing process of FIG. 2;

FIG. 4 is a relationship diagram between the fiber length and the number of short fibers contained in the fluff yarn obtained according to the present invention.

FIG. 5 is a diagram showing the relationship between the yarn strength and the number of fluffs, showing the fluff yarn obtained by the example of the present invention and the fluff yarn obtained by the conventional example for comparison.

[Explanation of symbols]

50 fluff yarn 51 multifilament yarn 52 fluff Y multifilament yarn 4 supply roller 5 guide 6 take-up roller P intersection point

Claims (6)

[Claims] 1. A multifilament yarn having a lower twist and an upper twist mixed with a single-yarn filament having a low thread strength and a single-yarn filament having a high thread strength, which is mainly a single thread having a high thread strength. While the filaments are continuous fibrous, the single-filament filaments with low yarn strength are cut into short fibers, and the cut ends of the filaments project as fluffs from the surface of the multifilament yarn, and the length of these fluffs is 1mm. A high tenacity fluff yarn in which the number of fluffs below is 830 / m or more, occupies 90% or more of the total number of fluffs, and the yarn strength of the multifilament yarn is 4.5 g / d or more. 2. The high tenacity fluff yarn according to claim 1, wherein the single yarn filament having a small yarn strength and the single yarn filament having a large yarn strength are constituted by a denier difference, and the total number of filaments is 20 or more. 3. The single yarn filament having a low yarn strength has a fineness of 0.1 to 1.5 denier, and the single yarn filament having a high yarn strength has a fineness of 3.5 to 10 denier. High-strength fluff yarn. 4. A multifilament yarn having a lower twist and an upper twist in which a single-filament filament having a low yarn strength and a single-filament filament having a high yarn strength are mixed and a running speed of 5 is obtained.
The yarn is wound around the guide while traveling at 0 m / min or less, and the yarn on the outward path toward the guide and the yarn on the return path returning from the guide are crossed with each other to give a twist and a handle. A method for producing a high-strength fluff yarn, in which a single-strength filament having low strength is cut into short fibers to generate fluff on the surface of the yarn. 5. The high tenacity fluff yarn according to claim 4, wherein the single yarn filament having a small yarn strength and the single yarn filament having a large yarn strength are constituted by a denier difference, and the total number of filaments is 20 or more. Production method. 6. The single yarn filament having a low yarn strength has a fineness of 0.1 to 1.5 denier, and the single yarn filament having a high yarn strength has a fineness of 3.5 to 10 denier. Method for producing high strength fluff yarn.