JPH0657562A - Production of specific complex false twisted textured yarn - Google Patents

Abstract

PURPOSE:To obtain yarn having excellent bulkiness and bundling properties and high softness by making yarn complex by false twisting processing and fluid treatment. CONSTITUTION:In winding thermoplastic yarn B on false twisted thermoplastic yarn A between a false twisting heater and a spindle in a overfeeding ratio of the yarn B larger than the yarn A, complex false twisting is carried out under a condition simultaneously satisfying the following formulas [1] and [2] and then the yarn is subjected to fluid interlacing treatment to produce specific conjugate false twisted textured yarn: TAX(DA)<1/7>>=420... [1]. TA-TB>=50... [2]. TA is temperature ( deg.C) of a winding point (P) where the yarn B is wound on the yarn A, DA is fineness (denier) of the yarn A and TB is temperature ( deg.C) at which thermal stress of the yarn B shows maximum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method in which false twisting and fluid treatment are combined to obtain a yarn which is highly bulky and bundles and which has high softness.

[0002]

2. Description of the Related Art As a method for forming a special yarn form by intertwining another filament around a core yarn, Japanese Patent Publication No. 51-30174 discloses a method for forming a false-twisted core yarn with 50 yarns.
A method is disclosed in which other wound yarns are wound while overfeeding by at least%, and then untwisted.

Further, in Japanese Patent Laid-Open No. 58-23923, while the pretwisted yarn (a) is false twisted in the same direction as the pretwisted direction, the other yarn (b) is supplied as filament yarn (a). A method of inserting between the heater and the spindle with a larger supply amount is disclosed, and in Japanese Patent Laid-Open No. 58-197326, the core yarn (a) supplied to the false twist area is false twisted, and the first heater is used. Yarn (b) is supplied between the core and the spindle to be wound around the core yarn (a) being processed, and then the yarn is passed through a balloon prevention guide attached to the false twist area and then untwisted. A method is disclosed, and further, in Japanese Patent Laid-Open No. 59-187634, a core yarn (a) made of a thermoplastic fiber being false-twisted is formed on a core yarn (b) between a heater and a spindle. a)
In a method of over-feeding by 40% or more, the core yarn is wound around the core yarn by twisting, and then untwisted,
A method of using a false twist textured yarn as the winding yarn is disclosed.

[0004]

However, although the composite yarn obtained by the above-mentioned prior art is excellent in bulkiness and bundling property, it is lacking in softness.
In recent years, the consumer's tendency toward fabrics has been toward differentiated products having higher softness, and even in the case of composite yarns having high bulkiness, it has become necessary to improve the softness. The present invention is
It is intended to provide a composite false twisting method capable of obtaining a yarn having high softness that meets such a demand.

[0005]

[Means for Solving the Problems] That is, the present invention provides a thermoplastic yarn (A) which is false twisted, and has a larger overfeed than the yarn (A) between the false twist heater and the spindle. When the thermoplastic yarn (B) is wound at a certain rate and then subjected to the fluid entanglement treatment, the compound false twisting is performed under the condition that the following expressions (1) and (2) are simultaneously satisfied, and then the fluid entanglement treatment is performed. The gist is a method of manufacturing a special composite false twisted yarn characterized by. TA × (DA) ^1/7 ≧ 420 ・ ・ ・ [1] TA-TB ≧ 50 ・ ・ ・ [2] However, TA is a winding point () at which the yarn (B) is wound around the yarn (A). P) temperature (° C), DA is the fineness (denier) of the yarn (A), and TB is the temperature (° C) that indicates the maximum thermal stress of the yarn (B).

The present invention will be described in detail below with reference to the drawings.
FIG. 1 shows the processing principle of the present invention, and FIG. 2 shows the form of the composite yarn obtained by the present invention. In FIG. 1, when the yarn (A) is supplied from the first feed roller (1) to the false twisting area and is false twisted through the first heater (3), the yarn (B) is changed to the yarn. (A) An overfeed rate (hereinafter, referred to as OF) higher than that of (A), a yarn is provided between the first heater (3) and the spindle (5) from the second feed roller (2) through the guide (4). Insert into (A) and perform false twisting. Subsequently, a fluid nozzle (7) installed between the first delivery roller (6) and the second heater (8) is mixed and entangled by air disturbance to form a composite yarn.

[0007] Further, if necessary, the second heater (8) is subjected to a stabilizing process, and is wound by a winder (10) through a second delivery roller (9). In addition, the OF of the yarn (A) and the yarn (B) is shown in FIG. 1 and is (the peripheral speed of the first feed roller (1) −the peripheral speed of the first delivery roller (6)) × 100% / the 1 peripheral speed of delivery roller (6), (peripheral speed of second feed roller (2) -peripheral speed of first delivery roller (6)) x 100% / peripheral speed of first delivery roller (6) Express with.

More specifically, when the yarn (B) is inserted into the yarn (A) in the twisting region from the guide (4) with an OF that is larger than that of the yarn (A), the yarn (B) ) Is wound along the longitudinal direction of the yarn (A) while vibrating up and down at a winding point (hereinafter referred to as a winding point) P with a very small amplitude due to retroactive twisting. The yarn (B) wound in the twisting region is untwisted by the spindle (5), and at the same time, as shown in FIG. 3, a part of the yarn (A) is looped around to form a structure.

After that, the first delivery roller (6)
Later, both yarns are mixed and entangled by fluid treatment. At this time, an important constituent element for achieving the present invention is a yarn (B) wound by the action of heat transferred from the heater (3) by the yarn (A).
It is a condition for applying a wound structure to the. That is, the holding temperature TA (° C.) of the yarn (A) at the winding point P and the fineness D of the yarn A
When A (denier) and the temperature TB (° C.) that shows the maximum value of the thermal stress of the yarn (B) are satisfied, it is necessary to satisfy the following conditions [1] and [2] at the same time. TA × (DA) ^1/7 ≧ 420 ・ ・ ・ [1] TA-TB ≧ 50 ・ ・ ・ [2]

More specifically, the amount of heat of the yarn (A) at the winding position P has a great influence on the molding effect on the yarn (B), and is an empirical formula as an index corresponding to the amount of heat [1 ] It is necessary to satisfy the formula. That is, yarn (B)
The temperature TA at the winding point P of the yarn (A) is important for giving an effective pattern to the yarn, but the mass DA of the yarn (A) is also important, and the present inventors It was found that the value of the formula [1] is the index.

Further, in order for the yarn (B) to be subjected to the heat-molding action by the yarn (A), the internal structure of the molecule needs to be rearranged, and the yarn (A) at the winding point P It is necessary that the temperature TA (° C.) is higher than the temperature TB (° C.) which shows the maximum value of the thermal stress of the yarn (B) by 50 ° C. or higher, preferably 60 ° C. or higher. Therefore, it is not preferable that the yarn (B) is a false-twisted yarn that has been heat-treated at a relatively high temperature or a yarn that has been subjected to a high-temperature relaxation heat treatment at the time of spinning for the purpose of imparting grain to the fabric.

From the above relationship, the determination of the winding point P is important, and the determination of the P point is determined by the position of the guide (4) for inserting the yarn (B) into the yarn (A). That is, the distance x
Is the distance from the lower part of the first heater (3), and the distance y is for the yarn (A) between the spindle (5) of the first heater (3) and the yarn (B) through the guide (4). It is the distance connecting the intersection and the center of the guide (4) when they are connected so as to form a right angle.

When an attempt is made to obtain a composite false-twisted yarn having the same texture, it depends on the overfeed rate (OF),
It is necessary to set these distances x and y so as to satisfy the expressions [1] and [2]. That is, y is the yarn (A)
Although it changes a little depending on the number of false twists, the fine OF (11) is formed at y = 2 cm, and the optimum OF is obtained as described later.
[(OF of thread (B) -OF of thread (A)) is 10 to 6
0%], when y = 5 cm, the yarn (B) vibrates greatly along the yarn (A) due to the retroactive twisting of the yarn (A), or the yarn (B) is attached to the yarn (A). A slab yarn having a true twist structure partially wound in three layers is formed, and a composite yarn having a loop of the present invention is not formed.

As described above, the yarn (A) and the yarn (B)
The difference in OF difference between the first delivery roller (6) and the first delivery roller (6) affects the morphology of the composite yarn and the behavior of the yarn processability, and changes depending on the elongation, fineness and false twist number of the yarn (A). It is as follows. When (OF of yarn (B) -OF of yarn (A)) is less than 10%, the yarn (B) gives excessive tension to the yarn (A) and causes yarn breakage. In addition, (thread (B)
If the value of (OF)-(OF of yarn (A)) exceeds 60%, the height of the loop becomes large, the releasability from the winding package deteriorates, and the fastener of the woven or knitted fabric becomes strong, which is not preferable. Further, (OF of yarn (B) -OF of yarn (A))
Is 100% or more, the yarn (B) becomes a nep or slab-like composite yarn, and the appearance of the woven or knitted product is deteriorated.

Therefore, (OF of thread (B) -thread (A)
OF) is preferably 10 to 60%. OF of yarn (A)
Regardless of the presence / absence of the yarn (B), it is selected in order to optimize the twisting and untwisting tension as is usually done during false twisting. The OF of the yarn (B) is mainly the yarn ( Although it varies depending on the fineness of A) and the number of false twists, the standard of optimization is appropriately selected within a range that does not cause excessive tension or slack such as yarn breakage in yarn (A) and yarn (B).

The yarn thus composited is subsequently subjected to an entanglement treatment with a fluid nozzle. A so-called Taslan nozzle or an interlace nozzle can be used as an apparatus for performing the confounding process with the fluid nozzle. This action is also an important effect of preventing separation of the two composite yarns and improving high-order workability, but a more important effect is an effect of increasing the conversion efficiency of the loop.

That is, as shown in FIG. 3, the yarn structure in which the yarn (B) is wound around the yarn (A) suppresses migration of the single fibers constituting the yarn (B) at the time of entanglement and loops. The efficiency of conversion to is higher. On the other hand, since the compounding in which the confounding process is performed by the fluid nozzle that is generally industrialized is performed in a state where the yarn (A) and the yarn (B) are aligned, the filament (A) can be freely migrated, and thus the yarn (A )
And the OF difference (thread length difference) of the yarn (B) is consumed by the interlacing, and the efficiency of conversion into a loop is reduced.

The fineness DA of the yarn (A) is cut by sandwiching the yarn (A) with a nipper just above the spindle of the false twisting machine.
The cut end in the heated and heat-fixed state is used as a sample of about 15 cm,
It is a value obtained by measuring the fineness (denier) by extending the slack. In addition, the temperature TA of the yarn (A) indicates a value measured by a non-tact II temperature measuring device manufactured by Teijin Engineering Ltd., and the thermal stress is 20 cm with a thermal stress measuring device manufactured by Orientec Co., Ltd. And initial load 1 / 100g /
d, temperature TB showing the maximum thermal stress Fmax as shown in FIG. 4 when measured at a heating rate of 100 ° C./1 min.

[0019]

EXAMPLES Examples will be described below. [Examples 1, 2, 3 and Comparative Examples 1, 2] LS manufactured by Mitsubishi Heavy Industries
Using a -6 type false twisting machine, as the yarn (A), two polyester stretched yarns having a fineness of 150 denier and a filament number of 48 are aligned, and as the yarn (B), a fineness of 175 denier and a filament number of 78 are used. Spindle speed 20 × 10 4 rpm, false twist number 14 using polyester stretched yarn
00t / m, first heater temperature / second heater temperature = 225
° C / 200 ° C, OF of yarn (A) / OF of yarn (B) =
2% / 50% and OF between the 2nd heaters were set to 15%, respectively, and the composite false twisting process was performed, and subsequently, by T321 made by Heberline Co., a fluid entanglement treatment was performed under the condition of an air pressure of 4 kgf / cm2. A false twisted yarn was obtained. At this time, x was changed and the position of the winding point P was measured under the condition of the guide distance y = 2 cm in the composite false twist. After that, the thread (A)
Temperature TA of the winding point P while processing only the above conditions
(° C) was measured. Fineness of yarn (A) DA (denier)
Was measured by the method described above. The temperature at which the maximum value of the thermal stress of the yarn (B) was 150 ° C. 1 m of the composite yarn
The sample was wound up for 100 m with a winder around the frame and subjected to a relaxation treatment in boiling water for 10 minutes. After air-drying the sample, a sensory test evaluated bulkiness, softness, and focusing property. The results are shown in Table 1.
As shown in Table 1, the composite yarn obtained in the present invention was found to have significant differences in softness, bulkiness, and sizing property as compared with the composite yarn of Comparative Example.

[0020]

[Table 1]

Comparative Example 3 A composite yarn was obtained in the same manner as in Example 1 except that the guide distance y was 5 cm. When the guide distance y = 5 cm, the winding point fluctuates, and the distance s between the winding point P and the lower part of the heater cannot be specified, and the obtained yarn is evaluated for bulkiness, bundling property, and softness. I was not satisfied.

[Examples 4, 5, 6 and Comparative Examples 4, 5, 5]
[6, 7] (TA-TB) The effect on the characteristics of the composite yarn was examined while changing the OF of the yarn (B). In the same composite false twisting method as in Example 1, (a) winding point P
Examples in which the winding point temperature of the yarn (A) is changed by changing the position of (A) (Examples 4 to 6 and Comparative Examples 4 to 6) and (b) without changing the position of the winding point P, An example in which the maximum value of the thermal stress was 170 ° C. by setting the hot plate temperature of the yarn twisting machine to a high value for the yarn (B) (Comparative Example 7). Was carried out. A sensory test was conducted on the composite yarn obtained under these conditions. The results are shown in Table 2, and it was found that the present invention has a significant effect.

[0023]

[Table 2]

Here, as shown in Example 1, when the distance s between the winding point P and the lower part of the heater is 2.5 cm, the bulkiness and the focusing property are excellent, and the softness is remarkably improved. When s = 20.5 cm in Comparative Example 2, softness, bulkiness, and focusing property are significantly reduced. The reason for this is that in Example 1, (TA-TB) is large, and the yarn (A) is inserted before the heat transferred by the first heater (3) is dissipated. As a result of heat-fixing the winding structure, a crimp (11) is applied to the yarn (B) constituting the composite yarn of FIG. 2 to form a composite yarn excellent in bulkiness, bundling property and softness. It seems to be. In Comparative Example 2, (TA-TB) is small, and the temperature of the yarn at the winding point P is low, so it is considered that the softness, bulkiness and bundling property are deteriorated. Therefore, it is preferable to adopt a high false twist temperature within a range in which the yarn (A) is not fused. However, as in Example 1, even when the yarn (A) at the winding point is at a high temperature, the temperature at which the maximum value of the thermal stress of the yarn (B) is high, that is, (TA-TB)
Comparative Example 7 having a small value does not produce the effect of the present invention.

[0025]

EFFECT OF THE INVENTION The amount of heat of the yarn (A) at the winding point described in the text, the temperature of the winding point of the yarn (A) and the temperature at which the maximum value of the thermal stress of the yarn (B) is shown. The composite yarn obtained by specifying the difference is excellent in bulkiness, softness, and bundling property. This composite yarn can be used for clothing and interior applications, and since it is particularly excellent in softness, it is possible to meet the recent trend toward high-end products by consumers.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the processing principle of the present invention.

FIG. 2 is a cross-sectional view showing a composite yarn form of the present invention.

FIG. 3 is a cross-sectional view showing a composite yarn structure immediately before a confounding process is performed by a fluid nozzle.

FIG. 4 is a diagram showing a relationship between a yarn temperature and a thermal stress.

[Explanation of symbols]

 A, B Thermoplastic yarn x, y Distance indicating the guide position. 1 1st feed roller 2 2nd feed roller 3 1st heater 4 Guide 5 Spindle 6 1st delivery roller 7 Fluid nozzle 8 2nd heater 9 2nd delivery roller 10 Winder 11 Winding structure of yarn (B) Molded state

Claims (1)

[Claims] 1. A thermoplastic yarn (A) which is false twisted.
When the thermoplastic yarn (B) is wound between the false twist heater and the spindle at an overfeed rate higher than that of the yarn (A) and subsequently subjected to the fluid entanglement treatment, the following formula [1]
And a method for producing a special composite false twisted yarn, which is characterized in that composite false twisting is performed under the condition that [2] is satisfied at the same time, and then fluid entanglement treatment is performed. TA × (DA) ^1/7 ≧ 420 ・ ・ ・ [1] TA-TB ≧ 50 ・ ・ ・ [2] However, TA is a winding point () at which the yarn (B) is wound around the yarn (A). P) temperature (° C), DA is the fineness (denier) of the yarn (A), and TB is the temperature (° C) that shows the maximum thermal stress of the yarn (B).