JPS63303135A - Production of bulky polyester yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for producing polyamide bulky yarn.

More specifically, a uniform loop due to fluid turbulence processing,
The present invention relates to a method for producing bulky polyamide yarn having slack and entanglement.

(Prior Art) Many methods have been proposed to produce bulky yarns by subjecting multifilament yarns to loops, slack, and entanglement by subjecting them to fluid turbulence treatment.

In particular, a method for manufacturing bulky yarns with a core-sheath structure has been proposed in which a plurality of multifilament yarns are subjected to fluid agitation treatment to give yarn length differences between the multifilament yarns to form loops, slack, and entanglement.

(Patent Application No. 61-307128).

Although the core-sheath structured yarn obtained by this method has excellent bulkiness, it has the disadvantage that the sheath yarn tends to shift easily and the shape robustness of loops, slack, and entanglement is insufficient. This drawback is more likely to be exacerbated as the processing speed of bulky yarn increases.9 For example, the processing speed of textiles using water jet looms, air jet looms, etc. is from the conventional 300 to 400 rpII at the rotational speed of the weft measuring drum of the loom. Recently, the speed has been increased to 600 to 900 rpm, especially 800 to 900 rpm, and even when processed at such high speed, the loops, slack, and entanglement formed in the manufacturing process of bulky yarn do not deteriorate, that is, the shape is robust. There was a demand for bulky yarn with excellent properties.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems in a method for manufacturing a bulky yarn with a core-sheath structure by subjecting a plurality of multifilament yarns to fluid agitation treatment, and provides a loop.

It is an object of the present invention to provide a method for producing a polyamide bulky yarn that is excellent in sagging and intertwining shape robustness.

(Means for Solving the Problems) The present invention has a redwood viscosity of 50 to 120 seconds (temperature 3
An oil agent containing mineral oil and an imidazoline compound (measured at 0°C) and having a composition satisfying the following formulas (a) to (c),
A polyamide multifilament undrawn yarn having at least 0.4% by weight of the same oil applied thereon is drawn, and then a single yarn with at least 0.4% of the oil applied thereto has a fineness of 2.
Together with other low-shrinkage polyamide multifilament yarns of 5 deniers or less, they are subjected to fluid turbulence treatment at a relaxation rate of 10 to 25% to reduce the yarn length difference between them and the other low-shrinkage polyamide multifilament yarns. The gist of the present invention is a method for producing a polyamide bulky yarn, which is characterized by forming loops, slacks, and entanglements at the same time.

60≦a≦90・−・・−・−・−−−・−・・−
・−・−・−−−−−−−−−−−−−−−−−−−
(a) 8≦b≦30−・−・−・−・−・−・・−・−
・−・・−・−・・−・・−・−−−−−−−−(
[1) a+b ≧80・・・・・・・・・・・
・−・−・・・・・・・・・−・−・−−−−−−−−
-------(c) where a represents the weight percent of the mineral oil in the oil agent, and b represents the weight percent of the imidazoline compound.

The present invention will be explained in detail below.

In the present invention, the composition of the oil agent applied to the undrawn polyamide multifilament yarn and the low shrinkage polyamide multifilament yarn is important. This oil mainly consists of mineral oil and an imidazoline compound, specifically mineral oil with a redwood viscosity of 50 to 120 seconds (measured at a temperature of 30°C), and sodium salt of polyoxyethylene lauryl imidazoline and polyoxyethylene oleyl imidazoline. betaine-type amphoteric surfactants such as potassium salts of

It consists of an imidazoline compound such as a quaternary ammonium cation type surfactant such as lauryl hydroxyethylimidazolium ethosulfate.

The amount (a) of mineral oil is 60 to 90% by weight, preferably 70 to 80% by weight. Mineral oil content is 60% by weight
When the amount is less, the coefficient of dynamic friction of the yarn becomes high and processability decreases. On the other hand, if it is more than 90% by weight.

Filament convergence deteriorates, making it impossible to obtain uniform loops and slack in fluid turbulence treatment.

The blending amount (b) of the imidazoline compound is 8 to 30% by weight.
, preferably 10 to 20% by weight. If the blending amount of the imidazoline compound is less than 8% by weight, the filament convergence will deteriorate, making it impossible to obtain uniform loops and slack in fluid turbulence treatment. On the other hand, if it is more than 30% by weight, the viscosity of the oil increases, the coefficient of dynamic friction of the yarn increases, and processability decreases.

Furthermore, the sum of the amounts of mineral oil and imidazoline compound (
a + b) is 80% by weight or more, preferably.

The ratio is 85-90%. The sum of this amount is 80% by weight
If the amount is less, the dynamic friction coefficient of the yarn becomes high and the filament cohesiveness decreases, making it impossible to obtain uniform loops and slack in fluid turbulence treatment.

Although this oil agent may be prepared using only mineral oil and an imidazoline compound, it is preferable to add a nonionic surfactant.

The application of oil to the undrawn yarns and low-shrinkage yarns is carried out in the form of an emulsion or straight (non-aqueous) oil using oil supply means such as rollers and oiling nozzles during the spinning process. is preferred. The amount of oil applied to the fibers is at least 0.
4% by weight is required. If the amount of oil adhered is less than 0.4%.

The coefficient of dynamic friction of the yarn increases, and the filament cohesiveness decreases, which is unfavorable for processing.

In the present invention, an undrawn polyamide multifilament yarn to which the above-mentioned oil is attached is drawn, and then 5 consecutive times, together with other low-shrinkage polyamide multifilament yarns to which at least 0.4% by weight of the same oil is attached, a fluid is drawn. The fluid is supplied to a turbulence treatment device and subjected to fluid turbulence treatment at a relaxation rate of 10 to 25%. The drawn yarn is made by drawing undrawn polyamide multifilament yarn.

It has internal structural distortion, causes extremely large contraction (substantially elastic recovery), and has a difference in yarn length from other low-shrinkage polyamide multifilament yarns. Although the stretching method and conditions vary depending on the spinning conditions and cannot be unambiguously determined, it is desirable to adopt conditions that can increase the amount of shrinkage of the drawn yarn immediately after stretching and increase the difference in yarn length as much as possible.

In the case of the present invention, after the undrawn yarn is drawn, the drawn yarn is wound up without continuous fluid turbulence treatment.
One condition is selected so as to satisfy the characteristic value range of birefringence of 0.04 or more, cutting elongation of 50% or less, and hot water shrinkage of 10% or more. Note that the cutting elongation was measured in accordance with JIS L1013, and the hot water shrinkage rate was measured in accordance with JIS L1073.

Further, the drawn yarn immediately after being stretched is subjected to fluid turbulence treatment under relaxed conditions together with the other low-shrinkage polyamide multifilament yarn to form loops, slack, and entanglement. The higher the relaxation rate at this time, the more easily loops, slack, and entanglements are formed (preferably).

However, it should be selected appropriately depending on the form and quality of the drawn yarn and other low-shrinkage multifilament yarns, workability, and the desired form and characteristics of the bulky yarn.

Although it cannot be limited, basically the amount of shrinkage is greater than the shrinkage amount of the undrawn yarn immediately after drawing, and in the case of the present invention,
The relaxation rate is 10-25%, preferably 12-20%. If the relaxation rate is lower than 10%, loops, sags, and entanglements will be formed even if fluid turbulence treatment is performed. The yarn gets wrapped around the delivery roller, leading to yarn breakage.
Undesirable.

Moreover, it becomes difficult to form an appropriate core-sheath structure composed of the drawn yarn and other low-shrinkage multifilament yarns.

The low shrinkage polyamide multifilament yarn used in the present invention satisfies the following characteristic value ranges: birefringence of 0.04 or more, elongation at break of 50% or less, and hot water shrinkage of 6% or less, preferably 5% or less. . In order to maintain the morphological robustness of the bulky yarn during the looping, sagging, and intertwining processing steps, it is necessary that the shrinkage rate of this low-shrinkage yarn is lower than that of the undrawn yarn immediately after stretching, and the shrinkage rate difference is 5. It is sufficient if there is a difference of % or more. The hot water shrinkage rate of the low shrinkage yarn at this time is 6% or less. In addition.

It is preferable that the single yarn fineness of the low shrinkage polyamide multifilament yarn is 2.5 denier or less, particularly 2.0 denier or less, since a soft texture can be obtained when it is made into a woven or knitted fabric.

The polyamides to which the present invention is applied include nylon 6°, nylon 66, nylon 46. Aliphatic polyamides (including mixtures and copolymers) such as nylon 610. Further, a polyamide blended with a matting agent, an antistatic agent, a heat resistant agent, an ultraviolet absorber, a transparency improver, a pigment, etc. may also be used. Further, the cross-sectional shape of each single yarn constituting the polyamide multifilament yarn is not limited to a circular shape, and may have an irregular cross-sectional shape such as a trilobal shape, or various cross-sectional shapes such as a flattened or hollow shape.

The present invention will be explained below with reference to FIG.

FIG. 1 is a process schematic diagram showing an example of the method of the present invention.

The polyamide multifilament undrawn yarn to which an oil agent satisfying the conditions of the present invention has been applied during the spinning process is once wound up and then transferred to the process shown in FIG. In the figure, a polyamide multifilament undrawn yarn Y (hereinafter referred to as yarn Y) is supplied to a feed roller 1 and stretched between it and a first delivery roller 3 via a stretching pin 2. . on the other hand.

As with yarn Y1 above, it was prepared by applying the oil agent of the present invention, then winding it up, then drawing and heat treating it. Another low-shrinkage polyamide multifilament yarn yz (hereinafter referred to as yarn Y2) is supplied to the first delivery roller 3, and together with the yarn Y just after being stretched, the relaxation rate is 10.
~25% is supplied to the fluid turbulence treatment device 4 and the second delivery roller 5. It is rolled up into a package 7 via a take-up roller 6.

During the fluid turbulence treatment, the yarn Y immediately after being stretched contracts and its relaxation rate is substantially reduced, whereas the other yarns Yx are low-shrinkage yarns that have been heat-set in advance after being stretched. As a result, the relaxation rate hardly decreased.

A yarn length difference occurs between yarn Y and yarn Y. At this time, yarn Y constitutes a core yarn, while yarn Y2, which has a relatively low yarn tension, is arranged around the outer periphery of yarn Y and constitutes a sheath yarn, and as a whole, the yarn Y2 constitutes a core yarn. A structure is formed, and the yarn Y
The constituent filaments of yarn Y1 are entangled with and intertwined with the constituent filaments of yarn Y1, and form a large number of loops and slacks.

In the present invention, since the yarn Y2 has low shrinkage, the shrinkage of the multifilament yarn in the subsequent process is reduced, and the oil agent of the present invention having a high coefficient of friction between filaments is used. Due to the synergistic effect of these, a bulky yarn with a core-sheath structure having loops, slack, and entanglements with extremely excellent shape robustness can be obtained.

As the fluid turbulence processing device used in the fluid turbulence processing of the present invention, a fluid turbulence processing nozzle capable of imparting loops, slacks, and entanglements is used. Company trademark) may be used.

(Example) The present invention will be explained below based on examples.

Example 1 Relative viscosity (96% by weight sulfuric acid as a solvent, concentration 1 g/a
Nylon 6 chips having a temperature of 2.55 (measured at a temperature of 25° C.) were melted at a temperature of 265° C., then discharged from a spinneret having a nozzle hole with a circular cross section of 9, and then cooled.

After applying the oil agent, it was wound onto a bobbin to obtain an undrawn yarn package. At this time, by changing the discharge amount and the number of nozzle holes, the yarn Y of the multifilament undrawn yarn shown in Table 1 was obtained.
l(!1kLA ”E) was obtained. This thread Y is,
A drawn yarn that was drawn at a draw ratio of 3.0 and then wound up at a relaxation rate of 5% without being subjected to fluid turbulence treatment.

It had the characteristics shown in Table 1.

In addition, the undrawn yarn obtained in the same manner as the yarn Y was separately drawn and heat treated to form a low shrinkage multifilament yarn Y.
t(IlhF-L) was obtained. The characteristics of this drawn yarn Yt are as follows:
They were as shown in Table 1.

11hA-E and mF-L are examples and as comparative examples! 1hL (when yarn Y2 is not low shrinkage) and 11
111M (when the single yarn fineness of yarn Y2 exceeds 2.5 denier).

The oil used was an emulsion oil containing 73% by weight of mineral oil (measured at a temperature of 30°C) with a redwood viscosity of 60 seconds, 12% by weight of potassium salt of polyoxyethylene oleyl imidazoline, and 15% by weight of polyoxyethylene oleyl ether. It is.

Table 1 (In width table 1, denier, F is the number of single threads.

dB Single yarn fineness (denier).

In the process shown in FIG.
The film was stretched at a stretching ratio of 3.0.

Next, the yarn Y2 is continuously combined by the first delivery roller 3, and supplied to the fluid turbulence processing device 4 with a relaxation rate of 15.5% to perform fluid turbulence processing. 5 and then 3 a take-up roller 6 with a surface speed of 440n+/rRin.
The yarn was picked up and a bulky yarn package was obtained.

The fluid turbulence processing device 4 is disclosed in Japanese Patent Application Laid-Open No. 57-11242.
Fluid turbulence treatment was performed using the fluid injection processing nozzle described in Publication No. 7 with the injection air pressure set to 8 kg/cnl.

The obtained bulky yarn has a core-sheath structure yarn in which the yarn Y1 constitutes the core yarn and the yarn Y2 constitutes the sheath yarn, and the constituent filaments are intertwined with each other, and there are many loops and slacks on the yarn surface. was being formed.

Using the bulky yarn obtained by the above method as a weft, 1. Ordinary spinning;
70 denier made of nylon 6 obtained through a stretching process
Weaving was carried out using a drawn yarn of 12 filaments as the warp. The loom is a Tsudakoma water jet loom Z W.
-303, the weaving conditions were set to 6 rotations of the weft length measuring drum.
A plain woven fabric was obtained at 5 Orpm with a weave density of 108 warps/inch and weft 70 threads/inch. Next, the obtained flat m@IJ was dyed and finished by a conventional method, and the texture was evaluated.

Table 2 shows the evaluation results. In Table 2, test number 1~
9 is an example, and tests ff11O to 11 are comparative examples.

As is clear from the results of Examples 9, the bulky yarn obtained by the method of the present invention does not cause the sheath yarn to shift due to tension, ironing, etc. during the weaving process, does not have a reduced number of loops, and has a good dyed finish. There was little change in the shape of the sheath yarn during the process, and it had excellent shape robustness. Further, the resulting woven fabric had a soft touch due to the presence of the loops, and exhibited an excellent voluminous feel (test patients 1 to 9).

On the other hand, as can be seen from the results of the comparative example, when the yarn Y2 did not have low shrinkage, the obtained bulky yarn was inferior in the shape fastness of loops and slack (Test Floor 10).

Further, when the yarn Y2 had a single yarn fineness exceeding 2.5 denier, the texture of the fabric was poor (Test NQll).

The evaluation method for bulky yarn is as follows.

(Threading samples were created using 11 loops and a slack black mount, and ranked according to the following criteria (1 to 5).

1: 50 pieces/m or less 2: 51-100 pieces/m 37 101-150 pieces/m 4: 151-250 pieces/m 5: 251 pieces/m or more The size of the loop is counted as one piece. ,
It is 0.5n+ or more.

(2) Shape and solidity: The distribution of the loops of the gray fabric woven in the weaving process, the finished dyeing, and the changes in the loop state between the fabric and the gray fabric after drying were evaluated by visual sensory inspection.

The following three-level evaluation was performed.

○: The distribution of loops on the gray fabric is uniform, and the number of loops on the fabric after dyeing and drying is slightly reduced.

△: The distribution of loops on the gray fabric is slightly uneven (distributed on the side opposite to the nozzle), and it is also dyed.

The number of loops in the fabric after drying is reduced.

×: Distribution of loops on the gray fabric is uneven (distribution on the anti-nozzle side increases significantly).

Also, the number of loops of the fabric after dyeing and drying. decreased significantly.

(3) Texture of the fabric A three-level evaluation was performed in a sensory test by handling the fabric after dyeing and finishing.

O: There is a soft feeling.

Δ: Slightly soft feeling.

×: No soft feeling.

Example 2 Yarn Yl (IlhB) in Table 1 obtained in the same manner as Example 1
) and yarn Y! Bulky yarn was obtained under the same conditions as in Example 1 except that (Fh G ) was used and the relaxation rate during the fluid turbulence treatment was changed, and the yarn was woven and dyed.

Table 3 shows the evaluation results.
-14 are examples, and test floor 15 is a comparative example.

Table 3 Example 3 The yarn Y t (llklN~~
P) and yarn Y-bar QR) were obtained.

QD 4th tun DA Garlic 3 denier (denier), F is the number of single threads, d is single thread variation (denier).

CD 4th tunn misaki mai string ↓ Jiyu (shi・ndō・shito 1rankyurikisec).

B. KJi polyoxyethylene oleyl imidazo sword
C. Polyoxyethylene oleyl ether.

D. Polyoxyethylene castor ether.

E. Polyoxyethylene lauryl ether.

(f) Na salt of polyoxyethylene oleyl phosphate Each component is % by weight. ) Using the threads shown in Table 4, bulky yarns were obtained under the same conditions as in Example 1, and subjected to weaving and dyeing finishing.

Table 5 shows the evaluation results. In Table 5, test number 16
Tests 11h19 to 18 are examples, and Tests 11h19 to 21 are comparative examples.

Table 5 When the oil agent of the present invention was used, the obtained bulky yarn had a large number of loops and excellent shape fastness, and the fabric had a soft feel and excellent volume.

(Effects of the Invention) The present invention has the above-mentioned configuration.According to the present invention, the present invention has loops, slacks, and entanglements with excellent shape robustness, and can be easily processed even at high speeds. It has a sheath thread that does not shift. A polyamide bulky yarn with a core-sheath structure can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a process schematic diagram showing an example of the method of the present invention. Y, --- polyamide multifilament undrawn yarn. Yt-low shrinkage polyamide multifilament yarn. 1--Feed roller, 2-Stretching pin. 3.--First delivery roller. 4-Fluid turbulence treatment device. 5.--Second delivery roller, 6.-Take-off roller. 7-... Bulky yarn package.

Claims (1)

[Claims] (1) Redwood viscosity is 50 to 120 seconds (temperature 30℃)
Stretching an undrawn polyamide multifilament yarn to which at least 0.4% by weight of an oil agent containing mineral oil and an imidazoline compound (measured by Subsequently, the same oil agent was continuously applied with at least 0.4% by weight of other low-shrinkage polyamide multifilament yarns with a single yarn fineness of 2.5 denier or less, and fluid turbulence was applied at a relaxation rate of 10 to 25%. A method for producing a polyamide bulky yarn, characterized in that it is treated to provide a yarn length difference between it and the other low-shrinkage polyamide multifilament yarns, and at the same time form loops, slack, and entanglement. 60≦a≦90…………………………(A) 8≦b≦30………………………………(B) a+b≧80………………………………(C) ) However, a represents the weight % of the mineral oil in the oil agent, and b represents the weight % of the imidazoline compound.