JPH0598510A - Production of polyester-based thick and thin yarn - Google Patents

Abstract

PURPOSE:To obtain the subject yarn having fine, random and natural appearance of thick parts by melt spinning a polyester, taking off the resultant yarn, subjecting the taken off undrawn yarn to yarn interlacing treatment between specifically arranged rollers and then drawing the yarn at a low draw ratio. CONSTITUTION:For example, a polyester in which >=90% constituent units are polyethylene terephthalate is melt spun and taken off from a spinneret 1. An oiling agent is then applied to the resultant yarn with an oiling roller 2 and the oiled yarn is then taken off with a take-off roller 3 arranged between the oiling roller 2 and the first godet roller 5 at a prescribed speed. The undrawn yarn is subjected to interlacing treatment with an interlacing nozzle 4 installed between the take-off roller 3 and the godet roller 5 and further drawn between the first godet roller 5 and the second godet roller 6 at a low draw ratio to afford the objective yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyester-based thick & thin yarn by using a spin draw method.

[0002]

2. Description of the Related Art Polyester-based thick & thin yarns, that is, polyester-based yarns whose fineness changes in the fiber axis direction, have a unique texture, and when the fabric is dyed, it produces a marbling shade. It is known as a special thread because it exhibits

As a conventional method for producing a polyester thick & thin yarn, it is known to draw an undrawn polyester yarn at an appropriate ratio and temperature. However, in this method, if an undrawn yarn immediately after spinning is used, it is difficult to develop thick & thin, and an undrawn yarn that has been aged for several days or more must be used. That is, according to this method, the thick & thin pattern has a drawback that it largely changes depending on the change with time of the undrawn yarn used.

On the other hand, various methods have been proposed for producing thick and thin yarns by a spin draw method, that is, a method in which polyester is melt-spun and drawn while being drawn instead of being once wound.

For example, in Japanese Unexamined Patent Publication No. 2-191710, melt-spun polyester undrawn yarns are continuously fed between a supply roller (first godet roller) and a drawing roller (second godet roller). When stretching unevenly,
The center distance between the supply roller and the stretching roller is 400 mm
Disclosed is a method of changing and adjusting the form of thick and thin yarns by moving the center distance by at least 200 mm within the range of the center distance of ˜1000 mm. However, this method produces thick & thin, but the length of the thick portion is too long. Even if the distance between the rollers is shortened, the shape of thick & thin does not change so much, and if the thick portion is expressed finely and randomly. It is not possible to make stable adjustments as mentioned above.

Further, Japanese Patent Publication No. 2-46701 discloses a highly oriented non-oriented polyester multi-filament yarn having an entangled portion and a non-entangled portion alternately arranged along the longitudinal direction of the yarn. A method is disclosed in which a drawn yarn is brought into contact with a friction body and drawn at a draw ratio of a natural draw ratio or less. However, even if the method is applied to a spin draw method and a friction body is inserted between the first godet roller and the second godet roller, a two-step stretching effect is produced and chic and thin are difficult to develop.

Furthermore, Japanese Patent Publication No. 61-6164 discloses that
3.500 m of melt-spun polyester undrawn yarn
A method is shown in which the material is drawn at a speed of not more than 1 minute / minute and confounded by a fluid injection nozzle, and subsequently drawn at a temperature below the second-order transition point of polyester and at a specific low draw ratio and wound.

[0008]

However, in the method disclosed in Japanese Examined Patent Publication No. 61-6164, the tension of the undrawn yarn tends to be unstable during the entanglement treatment, so that the yarn breakage during the entanglement treatment is induced. In addition, thick & thin has a drawback that the occurrence is unclear.

Therefore, the thick and thin yarn obtained by the conventional spin draw method has the drawbacks that the thick portion is too long and the expression is rough.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for obtaining fine and random thick & thin by spin draw method.

Another object is that if the chic portion becomes too clear and has a so-called lumpy shape, the fabric cannot be made to have a natural feel. Therefore, the chic portion has a slightly defocused and random chic portion. It is to provide a method for obtaining thick & thin yarn by a spin draw method.

[0012]

Means for Solving the Problems That is, according to the invention of claim 1, when melt-spun polyester is taken up and stretched at a low draw ratio without being once wound to cause thick and thin spots in the fiber axis direction, A take-up roller is arranged between the oiling roller and the first godet roller, and the take-up roller and the first godet roller are arranged.
A filament entanglement treatment is performed between the godet rollers, and the invention of claim 2 melt-spins the polyester and draws it out, and then stretches it at a low draw ratio without once winding it and stretches it in the fiber axial direction. The ratio of the take-up speed to the polyester discharge speed from the spinneret hole is 1 when making thick and thin spots on the surface.
It is set to 50 to 250, and yarn entanglement is applied between the oiling roller and the first godet roller.

The polyester referred to in the present invention is a polyester in which 90% or more of the constitutional unit is polyethylene terephthalate, and isophthalic acid or 5-sodium sulfoisophthalic acid may be copolymerized in a part of the acid component. Also, butanediol, propylene glycol, etc. may be copolymerized with a part of the glycol component.

The spinning method used in the present invention is a so-called spin draw method, which is a direct spinning / drawing method in which a yarn is drawn after being melt-spun without being once wound.

The present invention will be described below with reference to the drawings. FIG. 1 shows an example of the spin draw method, in which the polyester undrawn yarn melted and ejected from the die (1) is applied with an oil agent by an oiling roller (2) and then fixed by a take-up roller (3). It is drawn at a speed and drawn at a low draw ratio between the first godet roller (5) and the second godet roller (6) without being once wound.

Here, in the invention of claim 1, an interlacing nozzle (4) is provided between the take-up roller (3) and the first godet roller (5), and the polyester undrawn yarn is entangled. Apply.

The overfeed rate between the take-up roller (3) and the first godet roller (5) is 0 to 5%,
Particularly, 0.5 to 3% is preferable. Overfeed rate is 0
If it is less than 5% (underfeed), the entanglement is not sufficiently introduced, and the resulting chic & thin generation rate becomes poor. or,
If the overfeed rate is 5% or more, the entanglement is too strong, resulting in thick and thin chic and thin pieces, and more yarn breakage.

The shape of the interlaced nozzle used is not particularly specified. Also, the air pressure may be freely changed, but is 1 to 4 kg / cm ² , preferably ^{2 to 3} kg / cm ² .
^{Is 2} . The temperature of the first godet roller (5) needs to be lower than the glass transition temperature of polyester, and is room temperature to 65 ° C, preferably 40 to 55 ° C. Also, the first
The rotation speed of the godet roller (5) is 1.000-1.
800 m / min is preferable. Even if the rotation speed is further increased, there is no problem, but if it is too high, the undrawn yarn becomes a semi-drawn yarn, and the difference in fineness and fineness of the obtained thick & thin is reduced.

The draw ratio (DR) between the first godet roller (5) and the second godet roller (6) is 3.000.
<DR × V <3.600 (where V is the first godet roller speed m / min) is preferable.

Next, the invention of claim 2 will be described.
In the invention, the spinning draft, that is, the ratio of the polyester discharge speed at the spinning hole to the take-up speed indicated by the take-up roller (3) or the first godet roller (5) is 150 to 250. Perform the entanglement treatment while taking up the yarn.

[0021] The spinning draft needs to be 150 or more in order to stabilize the yarn tension and stabilize it, and further to obtain an appropriate yarn entanglement degree. However, if the spinning draft is more than 250, the spinnability of the polyester becomes poor and the yarn breaks frequently immediately below the spinneret.

The feed rate between the take-up roller (3) and the first godet roller (5), the shape of the interlaced nozzle, and the conditions of the first godet roller (5) may be the same as those of the invention of claim 1. ..

However, when the rotation speed of the first godet roller (5) is set to 1000 to 3000 m / min, a thick and thin natural expression can be obtained.

Next, FIG. 2 is an explanatory view showing another example of the spin draw method which can be used in the invention of claim 2. In the figure, the polyester yarn melted and discharged from the die (1) is applied with an oil agent by an oiling roller (2), and then subjected to a yarn entanglement treatment by an interlace nozzle (4).
Godet roller (5) and second godet roller (6)
And is stretched at a low stretch ratio.

The spin draw method shown in FIG. 2 can make the expression of thick & thin more random than the spin draw method shown in FIG. That is, since the yarn tension before entering the yarn entanglement treatment device (4) becomes slightly non-uniform, the entanglement becomes non-uniform, and when the yarn is subsequently stretched, the entangled portion remains unstretched, which is natural. This is because the chic part appears at random.

In the present invention as described above, the third component yarn may be further mixed by an air mixing method or the like. For example, the high shrinkage yarn is mixed with the thick & thin yarn obtained as described above. For example, forming a mixed shrinkage yarn.

Hereinafter, a method of manufacturing such a different shrinkage mixed yarn will be described. The high shrinkage yarns may be mixed with each other separately from the process of the present invention, but if the spin draw method is used, the different shrinkage mixed yarns can be produced efficiently in one process.

FIG. 4 is a schematic process diagram of the production of the different shrinkage mixed yarn by the spin draw method. The polyester undrawn yarn melt-spun from the spinneret (1) is an oiling roller (2).
After the oil agent has been applied in step 1, one of the yarn groups is subjected to the yarn entanglement treatment by the interless nozzle (4) as in the case of FIG. 2, and then the low temperature first godet roller (5) is used. Stretching at a low ratio is performed between the two godet rollers (6) to develop thick & thin, which results in a large heat shrinkage ratio.

Further, the other yarn group separated after passing the oiling roller (2) is the first godet roller (7) of high temperature.
And a second godet roller (6) are drawn to form a normal drawn yarn, and after passing through the second godet roller (6), the yarn is mixed with the yarn group and re-entangled by the winding interlace nozzle (8). Is applied to form a different shrinkage mixed yarn.

In the case of such a process by the spin draw method, the second godet roller (6) has a low temperature portion for thick & thin and a high temperature portion for normal yarn, which is due to the heating temperature of the roller. It is advisable to use a heater or the like that is separated so that it can be set for each part.

The temperature of the low temperature first godet roller (5) is about 55 ° C., the temperature of the high temperature first godet roller (7) is about 85 ° C., the temperature of the low temperature part of the second godet roller (6) is about 90 ° C. The temperature of the part is preferably about 135 ° C. Further, the rotation speed of the first godet rollers (5) and (7) is preferably 1000 to 1800 m / minute, the rotation speed of the second godet roller (6) is preferably about 3000 to 4500 m / minute, and the draw ratio is about 2 to 3.5. preferable.

The draw ratio (LDR) between the low temperature first godet roller (5) and the second godet roller (6) and the draw ratio (HDR) between the high temperature first godet roller (7) and the second godet roller (6) are If there is a large difference, it becomes difficult to wind it up, so it is preferable to approximate it, but it is preferable to make HDR higher by about 0.1 to 0.3 because thread shaking can be prevented.

[0033]

[Function] The form of thick and thin yarns composed of multifilaments depends on the degree of entanglement of yarns.

Further, the degree of entanglement of the yarns is determined by the yarn tension, the fluctuation rate of the tension, and the orientation of the yarns during the entanglement process.

In the case of the spin draw method, the tension control during drawing (close to the first godet roller) is generally more difficult than that of a drawing and twisting machine, so that it is difficult to obtain a high quality thick & thin yarn.

According to the present invention, in the first aspect of the invention, a take-up roller is attached to suppress the fluctuation of tension.
In the invention described above, by slightly increasing the spinning draft to improve the orientation of the yarn, the above-mentioned degree of entanglement is 20 to 50 entangles / m in the state before stretching, and 3 of multifilaments are used.
It is possible to stably control the state where 0 to 70% of the single yarns are entangled.

Therefore, according to the first aspect of the invention, the yarn breakage at the time of the yarn entanglement treatment is reduced, and the thick portion of the thick & thin expression due to the subsequent drawing at a low draw ratio can be easily made fine. become.

Further, in the invention of claim 2, since the spinning draft is set to 150 to 250, 30% to 70% of the single filaments of the multifilament constituting the yarn are entangled.
The resulting chic and thin are slightly blurred, which gives them a more natural feel. A schematic diagram of the expression state of the thick & thin is shown in Fig. 3 (a). FIG. 3 (b) shows a so-called lumpy chic & which is obtained when the spinning draft is low.
This is the expression state of syn.

[0039]

【Example】

Example 1 Titanium dioxide is contained in an amount of 0.3% by weight and has a solid phase viscosity of 0.
640 polyethylene terephthalate was melt extruded and 4
Spinning was performed at a constant discharge rate of 33 g / min from an 8-hole orifice. The spinning / winding device as shown in FIG. 1 was used, the interlace nozzle (4) was KS-700 manufactured by Sanyo Seiki Co., Ltd., and the air pressure was 3 kg / cm ² . The speeds of the take-up roller (3), the godet roller (5), and the second godet roller (6) were changed to prepare 11 kinds of thick & thin yarns. The temperature of the first godet roller (5) was 55 ° C and the temperature of the second godet roller (6) was 120 ° C.
And The results are shown in Table 1.

[0040]

[Table 1]

From these results, the first godet roller speed (V) was 1.000 to 1.800 m / min, and the draw ratio (D
It has been found that R) is preferably 3.000 <V × DR <3.600. It was also found that the overfeed rate between the take-up roller (3) and the first godet roller (5) is preferably 0 to 5%.

Example 2 Incorporating 0.3% by weight of titanium dioxide and having an intrinsic viscosity of 0.
640 polyethylene terephthalate was melted and wound with a device as shown in FIG. 2 at a constant discharge rate of 33 g / min from a 48-hole mouth orifice. At this time, the diameter of each single yarn of the mouthpiece orifice is 0.25 mmφ, 0.28 mmφ,
Using 5 types of spinnerets having 0.3 mmφ, 0.35 mmφ, and 0.38 mmφ, spin winding was performed under the same conditions to obtain 5 types of 90 d / 48 f fibers. As the interlace nozzle (4), KS-700 manufactured by Sanyo Seiki Co., Ltd. was used, and the air pressure was 3 kg / cm ² . The temperature of the first godet roller (5) is 55 ° C and the rotation speed is 1.4.
00 m / min, the temperature of the second godet roller (6) is 12
The temperature was 0 ° C. and the rotation speed was 3.300 m / min. The results are shown in Table 2.
Shown in. The spinning draft has a molten polyester specific gravity of 1.2.
Was calculated as

[0043]

[Table 2] From this result, it was found that the spinning draft of 150 to 250 is good.

Example 3 Incorporating 0.3% by weight of titanium dioxide and having an intrinsic viscosity of 0.
640 polyethylene terephthalate melted, 48-hole mouthpiece orifice (each single yarn hole diameter 0.28mmφ)
Was spun at a constant discharge rate of 33 g / min, and then wound up using a device as shown in FIG.

As the interlace nozzle (4), KS-700 manufactured by Sanyo Seiki Co., Ltd. was used, and the air pressure was 3.0.
It was set to kg / cm ² . Also, the first godet roller (5)
The temperature was 55 ° C., the rotation speed was 1600 m / min, and the rotation speed of the second godet roller (6) was 4000 m / min.

After passing the oiling roller (2), 24
The filaments are supplied to the interlace nozzle (4), the remaining 24 filaments are supplied to the low temperature second godet roller (7) at 80 ° C, and both yarns are supplied to the second godet roller (6). After passing through the roller, an air pressure of 4.0 kg /
It was mixed and entangled at a cm ² .

In the second godet roller (6), an internal heater (not shown) is separated into a right part and a left part. The left part heater is 90 ° C and the right part heater is 135 ° C. Was set. FIG. 5 is a schematic top view of the vicinity of the second godet roller (6). Both yarns wound separately in the low temperature left part (C) and the high temperature right part (H) are passed after the roller passes. Each yarn is combined and supplied to the winding interlace nozzle (8) to form a 90d / 48f different shrinkage mixed yarn.

The heterogeneous shrinkage mixed yarn thus obtained is subjected to heat treatment / dyeing treatment at 130 ° C., the yarn having fine and random thick and thin is around the core, and the ordinary yarn is wound around the yarn.
It had a random and blurred natural appearance.

[0049]

Industrial Applicability By the method of the present invention, polyester-based thick & thin yarn can be manufactured easily and quickly.
Further, there is no variation in the form that causes a difference in change over time, and it is possible to suppress the generation of warp lines and weft steps when the woven or knitted material is formed.

Furthermore, the invention of claim 1 can be applied to various brands by simply changing the mouthpiece and the discharge amount.
It is also extremely advantageous from the point of view of small-lot, multi-product production.

Further, in the invention of claim 2, the obtained thick and thin yarns show a slightly blurred density difference when dyed, but rather it can express a natural feeling and is fine and random. A dry texture can be expressed. Therefore, the thick and thin yarn obtained is suitable as a material for women's blouses and dresses.

The appearance can be made to be a different shrinkage mixed yarn, and a thick and thin yarn can be used for the core portion to further enhance the natural feeling. Such a different shrinkage mixed yarn is obtained by using the SPD method. It is efficient to manufacture in one step.

[Brief description of drawings]

FIG. 1 is a schematic process drawing showing an example of a spin draw method used in the present invention.

FIG. 2 is a schematic process drawing showing an example of a spin draw method used in the invention of claim 2.

FIG. 3A is a schematic diagram of the form of thick and thin yarn obtained by the method of the present invention. (B) is a schematic diagram of the form of a thick & thin yarn obtained by a conventional spin draw method.

FIG. 4 is a schematic process drawing showing an example in which the invention of claim 2 is made into a different shrinkage mixed fiber using a spin draw method.

5 is a schematic top view showing the vicinity of the second godet roller in the schematic view of FIG.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location D02G 3/22 7199-3B D02J 1/00 X 7199-3B 1/22 M 7199-3B 302 C 7199 -3B

Claims (2)

[Claims] 1. A take-up roller between an oiling roller and a first godet roller when melt-spun polyester is taken up and drawn at a low draw ratio without being once wound to produce thick and thin spots in the fiber axis direction. And a yarn entanglement treatment is performed between the take-up roller and the first godet roller. 2. When the polyester is melt-spun and drawn, and stretched at a low draw ratio without being once wound to produce thick and thin spots in the fiber axis direction, the take-up speed and the polyester discharge speed from the spinneret hole A method for producing a polyester-based thick & thin yarn, characterized in that the ratio is 150 to 250, and the yarn entanglement is applied between the oiling roller and the first godet roller.