JP2971084B2 - Method for producing composite bulky yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a composite bulky yarn having a difference in light and light dyeing properties and large and small loops mixed in the longitudinal direction of the yarn and having a wool spinning system-like appearance and feeling. And a method for producing the same.

(Prior Art) Conventionally, a method of supplying a yarn to a turbulent flow region of a fluid, giving a loop or entanglement, and obtaining a spun-like processed yarn is well known. However, when the processed yarn obtained by such a method is made into a fabric, although the loops are present on the surface, the individual filaments constituting the yarn are uniform, so that the appearance of the fabric is monotonous and natural fiber tone is obtained. It is difficult to meet the diversifying demands of consumers because of its poor appearance with uneven spots.

On the other hand, a method of imparting a change in appearance to a yarn is disclosed in
It is proposed in Japanese Patent No. 35172 and Japanese Patent Application Laid-Open No. 52-96259.

In the former method, the thick portion is randomly formed by thermally stretching the yarn at a draw ratio equal to or less than the natural stretching ratio, and then the thick portion is made brittle by a second heat treatment. It is a method of generating.

The yarn obtained by this method has a spun-like appearance, but has a drawback such as inducing yarn breakage during knitting and weaving due to the weak strength of the thick part.

The latter is a polyester thick and thin yarn which is formed by using an undrawn yarn or a highly oriented undrawn yarn, drawing it incompletely by drawing it incompletely, heat setting it, and then winding it into a package such as a pan. And a method in which other yarns are aligned and subjected to fluid turbulence treatment to obtain a bulky yarn.

Also in this method, the thick and thin yarn supplied to the fluid treatment zone has thick and thin spots in the longitudinal direction of the yarn, but the heat shrinkage characteristics are relatively uniform. The change in the appearance is monotonous due to the size of the loop, and has not yet reached the complicated and subtle so-called natural appearance change unique to wool spun yarn.

In addition, the thick yarn generally has a large fluctuation in the unwinding tension from the package, and thus has a drawback that a thick filament having a high elongation is easily stretched. However, the method proposed in the above two publications is also used. This has the disadvantage that the fluctuation of the unwinding tension of the supply yarn spreads to the fluid treatment zone and reduces the entanglement effect. As a result, the yarn breakage occurs frequently during yarn processing, , The yarn is laid down in the post-process such as weaving, weaving,
It had many practical problems, such as inducing slab-like defects.

(Problems to be solved by the invention) The present invention solves the problems of the prior art as described above,
The thick thread has tight and tight loops and entanglements,
It has a stable form against squeezing and elongation during knitting and weaving, and a large number of loops with different heights are formed on the entire yarn.
It is an object of the present invention to provide a method for producing a composite bulky yarn which can impart a wool spun yarn-like appearance and a bulky feeling when made into a fabric by mixing portions having different heat shrinkage rates in the longitudinal direction. It is a technical issue.

(Means for Solving the Problems) The present inventors have conducted intensive studies to solve the above problems, and as a result, using a polyester high-depth unstretched yarn, heat-shrinking it under specific conditions, and then drawing. To form thick spots,
Then, if continuous fluid disturbance treatment is applied, it has a stable form against squeezing and elongation during weaving and weaving, and in addition to the size of the loop, a change in the bunching property in the longitudinal direction of the yarn is given. The present inventors have found that it is possible to produce a composite bulky yarn capable of imparting a complicated and delicate change in appearance and feeling like using a wool spun yarn to a fabric, and arrived at the present invention.

That is, according to the present invention, the birefringence (Δn) is 20 × 10 ⁻³ to
80 × 10 ^-3 polyester highly oriented undrawn yarn, relaxation rate 30%
After the above heat treatment without contacting the heating device, the yarn is stretched into a yarn (A) having thick and thin spots in the longitudinal direction, and then the yarn (A) and another thermoplastic synthetic material having an elongation of 50% or less. A multifilament yarn (B) is a method for producing a composite bulky yarn, which comprises subjecting the multifilament yarn (B) to a fluid disturbance treatment by increasing the overfeed rate of the yarn (A) from the yarn (B). is there.

 Hereinafter, the present invention will be described in detail.

In the present invention, first, the birefringence (Δn) is 20 × 10 ⁻³ to 80 ×.
10 (hereinafter referred to as relaxation heat treatment.) Heat treatment without the polyester highly oriented undrawn yarn is ^-3 contacting the heating device in the relaxation rate of 30% or more is subjected.

If the birefringence (△ n) of the polyester oriented unstretched yarn subjected to the relaxation heat treatment is less than 20 × 10 ^-3 , the filament becomes brittle during the relaxation heat treatment, so that the yarn breakage frequently occurs during the subsequent drawing and fluid disturbance treatment. And the operability deteriorates. Also,
If the birefringence (Δn) exceeds 80 × 10 ⁻³ , the amount of shrinkage during the relaxation heat treatment is small, and it is not possible to form a clear thick spot in subsequent stretching, which is not preferable.

In addition, it is necessary that the relaxation rate when the polyester high-orientation undrawn yarn is subjected to the relaxation heat treatment be 30% or more. If the relaxation rate is less than 30%, the shrinkage of the filament cannot be sufficiently obtained.
In addition, a clear and thin shape is not formed in the subsequent stretching.

The higher the relaxation rate, the more the shrinkage spots can be emphasized, but the more easily the slack breaks due to shrinkage. Therefore, it is necessary to appropriately select the relaxation rate in consideration of this point. According to the experimental results of the present inventors, 30 to 150% is preferable. Here, the relaxation rate is a percentage of the difference between the supply speed and the take-up speed with respect to the take-up speed.

In addition, the relaxation heat treatment needs to be performed in a non-contact manner, so that the yarn travels without contact friction, and shrinkage processing with an excessive shrinkage ratio can be performed without a problem of yarn breakage.
Here, the temperature of the relaxation heat treatment is determined by the birefringence (△
n), the length of the heater, the yarn speed, and the like may be appropriately selected, but according to the experimental results of the present inventors, 130 to 240 ° C. is preferable.

In this way, the polyester highly oriented undrawn yarn is subjected to a relaxation heat treatment, whereby uneven shrinkage is developed to obtain a yarn having unevenness in fineness.

It is considered that the unevenness in shrinkage and the fineness due to the relaxation heat treatment are caused by the presence of a partial internal strain in the longitudinal direction of the single filament of the highly oriented undrawn polyester yarn. Since the shrinkage spots and the fineness spots are present, a yarn having irregular thick and thin spots in which the positions of the thick portions are different between the filaments in the subsequent drawing step can be obtained.

In the present invention, a yarn (A) having a thick spot in the longitudinal direction obtained by stretching a heat-treated polyester highly oriented unstretched yarn.
And In this case, the stretching ratio is preferably 1.30 or more, and if the delay ratio is less than 1.30, thick and thin spots are unlikely to appear.
On the other hand, if the stretching ratio is too high, the thickness difference decreases, so the upper limit of the stretching ratio is (1 + α / 100) × 1.3 [α
(Relaxation rate of polyester highly oriented undrawn yarn (%)].

The delay temperature is the temperature below the softening point of the yarn,
In particular, stretching at room temperature is preferred.

By stretching the yarn on which the shrinkage spots and fineness spots have been formed by the relaxation heat treatment, the internal structure of each filament of the yarn changes randomly in the longitudinal direction, and thick and thin spots and heat shrinkage spot spots are formed. At the same time, a force (shrinking force) for restoring the tensioned yarn immediately after stretching is applied. The shrinking force applied to this thick thread enables a tight loop to be formed in the subsequent fluid agitation zone.

In addition, the heat-shrinkage rate is low in the portion that is not substantially stretched (thick portion), and the heat-shrinkage ratio is high in the stretched portion (detail).

In the present invention, the yarn (A) having the thick and thin spots obtained by drawing and the other thermoplastic synthetic multifilament yarn (B) are aligned and subjected to a fluid disturbance treatment in a relaxed state. However, in this case, without winding the yarn (A),
It is important to carry out a fluid disturbance treatment following the stretching.

That is, the drawn yarn (A) has a high elongation (elongation of 60).
130130%), especially because the thick part is easily stretched, it cannot be stably wound or unwound from the wound package.

However, as described above, if the fluid disturbance treatment is performed continuously after stretching, troubles in unwinding the thick and thin yarn once wound into a package, which has been a problem in the past (reduction of confounding property due to elongation). , Fluff and yarn breakage) are eliminated, and the stretched yarn (A) is obtained in a certain relaxed state, and is stably supplied at a low tension to the fluid disturbance zone. ), And the entanglement with other yarns (B) is improved. In addition, the loops and entanglements formed in the yarn are tightened by the retraction force applied during stretching, and a tight loop state is obtained.

The supply amount (overfeed rate) during the fluid disturbance treatment is
The yarn (A) is more than the yarn (B), and the overfeed ratio is 15 to 80% for the yarn (A) and 3 to 20% for the yarn (B).
Preferably, by increasing the overfeed rate of the yarn (A), the dyeing enhances the different color effect of dyeing the thick part into a dark color part and the details into a light color part, and improves the bulkiness. Can be.

Heat treating the composite bulky yarn obtained by the present invention,
Alternatively, when the fabric obtained by knitting and weaving the yarn is heat-treated in the dyeing process, the following special effects are exhibited.

That is, since the yarn (A) having thick and thin spots has a high thermal shrinkage ratio in the details as described above, when a shrinkage action due to heat is applied to the filaments in the details, the loop formed by the filaments is densely reduced in size. At the same time, the entanglement of the yarn (B) with the filament can be strengthened. Also, by preferentially reducing the size of the loop formed by the details, the thick part loop having the deep dyeing property is emphasized, and a change in the convergence property between the thick part and the detail can be given. .

In the present invention, the fluid injection nozzle used for the fluid disturbance treatment is not particularly limited, and may be any one having an ability to form a loop in the yarn. Taslan nozzles can be used.

The pressure of the compressed air to be supplied to the fluid injection nozzle may be appropriately selected in consideration of the desired yarn form such as the type of the supply yarn, the fineness, the number of filaments, and the like, but 3 to 8 kg / cm ² is preferably used.

The other yarn (B) may be a drawn yarn composed of multifilament thermoplastic synthetic fibers such as polyester or polyamide, or an ultra high-speed spinning yarn (spinning speed of 4,000 m / min or more).
A low elongation yarn (elongation: 50% or less) that is stable against elongation, such as a yarn obtained by elongation, is preferred.

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic process diagram showing one embodiment of the present invention. In FIG. 1, the polyester non-oriented yarn Y ₁ drawn from the spool 1 is subjected to a relaxation heat treatment in a non-contact state by a first heater 4 between a first feed roller 3 and a first delivery roller 5. Later, the first delivery roller 5
And the second delivery roller 6 is cold-drawn to form a yarn (A) having thick and thin spots.

The yarn (A) is aligned with the yarn (B) drawn from the pan 2 and supplied to the second feed roller 8, guided to the fluid ejection nozzle 7, and subjected to a fluid disturbance process. 3
Package by take-up roller 12 after delivery roller 9
Winded up to 13.

The bulky composite yarn passed through the third delivery roller 9 is transferred to the second delivery roller 9 between the third delivery roller 9 and the fourth delivery roller 11.
After the heat treatment is performed by the heater 10, it may be wound.

FIG. 2 is a schematic view showing the appearance of an embodiment of the composite bulky yarn obtained by the present invention. In the figure, (c) is a thick (dye-dyeable) filament, and (d) is a detail (light-dyeable) filament. ) Filament.

(Operation) As described above, in the present invention, the polyester highly oriented undrawn yarn is subjected to a relaxation heat treatment so as to develop a shrinkage unevenness to form a yarn having a fineness unevenness, and subsequently stretched to obtain a yarn between filaments. In addition to forming irregular thick and thin spots and irregularities in heat shrinkage at the positions of the portions, it is possible to apply a force (shrinking force) for the yarn tensioned immediately after stretching to restore the original shape.

In addition, since the fluid disruption treatment is performed continuously after the drawing, the yarn (A) having thick and thin spots can be stably supplied to the fluid disturbance treatment zone at a constant low tension. The yarn (A) is easily opened (baked), the entanglement with the yarn (B) is improved, and a tight loop or entanglement can be formed by the release force.

Furthermore, the yarn (A) changes its internal physical properties during stretching,
Since a thick part with a low heat shrinkage and details with a high heat shrinkage are formed, if the composite bulky yarn obtained by the present invention or a fabric using this yarn is subjected to a heat treatment, it can be formed with a thick and thin filament. Of the loops formed, the loops formed by the fine filaments having a large heat shrinkage ratio are preferentially reduced in size to form a dense loop state, and the entanglement of the yarn (B) with the filament can be strengthened. .

As described above, the light-colored loop formed by the fine filaments is reduced in size, the deep-colored loops formed by the thick filaments are emphasized, and the convergence property is changed between the two. By knitting and weaving the composite bulky yarn obtained in the above, a fabric having a wool spinning-like appearance and feeling excellent in a different color effect can be obtained.

<Examples> Next, the present invention will be specifically described with reference to examples.

Example 1 A polyester terephthalate highly oriented unstretched yarn 110d / 36f having a birefringence (Δn) of 51 × 10 ⁻³ obtained by high-speed spinning was subjected to the process shown in FIG. 1 under the conditions shown in Table 1. A relaxation heat treatment and stretching were performed to obtain a yarn (A) having thick and thin spots.

In the yarn obtained in Experiment No. 1, the relaxation rate was less than 30%, so the thick and thin spots were unclear.

Yarn with thick and thin spots obtained in Experiment Nos. 2 to 4 (A)
This was aligned with a 50d / 24f drawn polyethylene terephthalate yarn (elongation at break: 31%, hot water shrinkage: 8%), and subjected to fluid disturbance treatment and heat treatment under the conditions shown in Table 2.

In Experiments Nos. 5 to 7, as shown in FIG. 1, the stretching was performed and the treatment after the fluid agitation treatment was performed continuously. The obtained composite bulky yarn was mainly a yarn having thick and fine spots. The filament (A) is arranged on the outer periphery of the filament (B), and the filament having the thick and thin spots of the filament (A) forms a number of loops,
In addition, the loop composed of the fine filament has a tight and tight loop.

On the other hand, in Experiment No. 8, the yarn (A) was once wound and then treated under the same conditions as in Experiment No. 6, but the composite bulky yarn intended for the present invention was not obtained.

When the composite bulky yarn obtained in Experiment No. 6 was used for the warp and weft and woven into a 2/2 twill structure, there was no slippage of the loop due to ironing during weaving and good weavability was exhibited.

In addition, when the obtained woven fabric was subjected to ordinary polyester dyeing treatment, the details having dense loops were light-colored, and the thick portions became loops emphasized in dark color, and the wool spun yarn having irregularities and a different color effect A voluminous textured fabric was obtained.

<Effects of the Invention> According to the present invention, although a part of the yarn (A) having a thick and thin spot is formed, the yarn has tight and tight loops and twines, and is produced at the time of knitting and weaving. It has a stable form against squeezing and elongation, and a large number of loops with different heights are formed on the entire yarn. Furthermore, the filaments forming the loops are mixed with portions having different heat shrinkage in the longitudinal direction. As a result, it is possible to easily and stably produce a composite bulky yarn that can be used as a fabric having a wool spun yarn-like appearance and texture.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram showing one embodiment of the present invention, and FIG.
The figure is a schematic external view showing one embodiment of the composite bulky yarn obtained by the present invention. Y ₁ Highly oriented polyester undrawn yarn 3 First feed roller 4 First heater 5 First delivery roller 6 Second delivery roller 7 Fluid ejection nozzle 8 Second feed roller 9 … Third delivery roller 10 …… second heater 12 …… wind-up roller

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification symbol FI D02J 1/02 D02J 1/02 13/00 13/00 A (58) Fields investigated (Int.Cl. ⁶ , DB name) D02J , D02G F-term theme code 4L036

Claims (1)

(57) [Claims] An undrawn polyester highly oriented yarn having a birefringence (Δn) of 20 × 10 ⁻³ to 80 × 10 ⁻³ is heat-treated at a relaxation rate of 30% or more without contacting a heating device. It is drawn into a yarn (A) having a thick and thin spot in the longitudinal direction. Subsequently, the yarn (A) and another thermoplastic synthetic multifilament yarn (B) having an elongation of 50% or less are formed into a yarn ( B) A method for producing a composite bulky yarn, characterized in that a fluid disturbance treatment is performed by increasing the overfeed rate of the yarn (A).