JPS63211327A - Production of bulky polyamide yarn - Google Patents

Abstract

PURPOSE:To obtain a bulky yarn having uniform loop, sag and entanglement and easily unreelable from a package, by applying a specific oil to an undrawn polyamide yarn and carrying out drawing and turbulent fluid treatment of the yarn under specific condition. CONSTITUTION:An oil containing (A) 60-90wt.% mineral oil having a Redwood viscosity of 50-120sec at 30 deg.C and (B) 8-30wt.% imidazoline compound (A+B is >=80wt.%) is applied to an undrawn polyamide multifilament yarn. The treated undrawn yarn is drawn under heat-treatment at 110-170 deg.C and subsequently subjected to turbulent fluid treatment at a relaxation ratio of 5-20% without winding the yarn.

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 polyamide bulky yarn that has sag and tangles and has good unwinding properties from a package.

(Prior Art) It is a well-known technique to apply a fluid turbulence treatment to multifilament yarns such as polyamide yarns to give them loops, slacks, and entanglements, thereby increasing the bulk of the yarns.

However, simply performing fluid turbulence treatment is insufficient in terms of the robustness and bulkiness of loops and slack, and various improvement methods have been proposed, for example.

Special Publication No. 36-13120, Publication No. 41-2435
No. 8, Japanese Unexamined Patent Application Publication No. 58-144143, etc., in order to easily cause loops and slack.

A fluid turbulence processing method or device for subjecting yarn to heating treatment has been disclosed. According to fluid turbulence processing using these methods and devices, loops and slacks are likely to occur, so bulky processed yarns can be obtained.

However, because moisture absorption treatment is applied, scum may adhere to the nozzle thread holes and guides during processing, reducing the likelihood of loops or sagging, or if the amount of liquid ejected from the nozzle fluctuates. There is a drawback that unevenness occurs in the loops and slack of the yarn, and a bulky yarn with uniform loops and slack cannot be obtained.

In order to improve bulkiness and texture, for example, Japanese Patent Application Laid-Open No. 50-89659 discloses that by bringing thermoplastic multifilament yarn into contact with a heating body with a tension less than the heat shrinkage stress, filaments are randomly distributed. After applying a significant shrinkage difference, yarn length difference, and loop, fluid turbulence is processed without applying substantial tension.

A method has been proposed in which crimps and loops are intertwined with each other. However, although the processed yarn obtained by this method has good bulkiness, it also contains many large slacks and loops, which makes it difficult to unwind from the package, and therefore, it becomes tangled during the weaving and knitting process.

This has the disadvantage that disconnections occur and the operating rate decreases.

Furthermore, as a method for improving the unwinding property, for example.

In the example of Japanese Patent Publication No. 61-36104, 90% of redwood mineral oil with a viscosity of 70 seconds (30"C) is added just before winding.
It is described that an oil agent containing at least -t% is applied.

According to this method, it is possible to improve the unwinding property, but
There is a problem in that a new oil application device must be provided, which increases costs.

(Problems to be Solved by the Invention) As mentioned above, the polyamide bulky yarn obtained by conventional fluid turbulence processing has irregularities such as loops and sag.
Furthermore, there were other drawbacks such as poor unwinding properties.

The present invention eliminates the above-mentioned drawbacks, and can not only impart uniform loops, slack, and entanglement to polyamide multifilament yarns, but also stably produce polyamide bulky yarns that are easy to unwind from packages. The technical problem is to provide a method for manufacturing polyamide bulky yarn.

(Means for solving problems) We have uniform loops, slack.

As a result of intensive study on a method for obtaining a polyamide bulky yarn with good unwinding properties, we selected an imidazoline compound as an antistatic agent and created a polyamide yarn with an oil agent having a larger blending ratio of mineral oil and imidazoline compound than conventional oil agents. Heat treatment of drawn yarn.

If fluid turbulence treatment is applied after stretching without winding up,
The present invention was achieved by discovering that a bulky yarn that satisfies the above objectives can be obtained.

That is, in the present invention, the redwood viscosity is 50 to 120.
The mineral oil and the imidazoline compound that are
．． The undrawn polyamide multifilament yarn with 4 wt% attached is drawn while being heat-treated at a temperature of 110 to 170°C, and then subjected to fluid turbulence treatment at a relaxation rate of 5 to 20% without winding up the drawn yarn. The gist of the present invention is to provide a method for producing bulky polyamide yarn, which is characterized by forming loops and slacks by applying the following steps.

60 t%≦a≦90-t%・−・−・・・・ （1
)8wt%≦b≦30−t% −・−−−−−・ (I
T) a+b≧80wt% ・−−−−−−−−−−−(
nr) However, a is the wt of mineral oil in the oil solution (Iiff
i)%.

b indicates -t (heavy ff1)% of the imidazoline compound.

Hereinafter, nine aspects of the present invention will be described in detail.

In the present invention, the compositional concentration of the oil agent applied to the undrawn polyamide multifilament yarn is extremely important, and it is necessary to apply the oil agent mainly composed of mineral oil and an imidazoline compound during the spinning process or the like.

Mineral oil has a redwood viscosity of 50 to 120 seconds (30℃
) must be used for less than 50 seconds (30℃)
In this case, the boiling point is lowered, so that scattering increases during the heat treatment process, and therefore, the unwinding property of the bulky yarn obtained by the fluid turbulence treatment from the package is decreased. On the other hand, 120 seconds (30
℃) or higher, the coefficient of dynamic friction of the yarn becomes hollow,
Smoothness decreases, single yarn winding and cutting increase, and processability deteriorates.

Moreover, the blending amount (a) of mineral oil is 60 to 90 wt%, preferably 70 to 80 wt%. The amount of mineral oil is 60-
If it is less than t%, the yarn movement F! On the other hand, the X friction coefficient increases and the workability and unwinding properties decrease.

If it is more than 90-1%, the cohesiveness between single yarns will deteriorate, making it impossible to obtain uniform loops, slack, and good workability in fluid turbulence treatment.

The formulation of the imidazoline compound in the oil agent (b) is.

8-30 ivt%, preferably 10-20-1%.

If it is less than 8 wt%, the cohesiveness between single yarns will decrease, making it difficult to obtain uniform loops and slack;
If it is more than 30 wt%, the viscosity of the oil becomes high and the coefficient of dynamic friction of the yarn increases, resulting in poor processability.

Unravelability deteriorates.

Furthermore, the sum (a+b) of the blended amounts of mineral oil and imidazoline compound in the oil agent is 80 wt% or more, preferably 85 to 85 wt%.
It is necessary to make the groove 90 wt %, and if 80 wt % is not grooved, the coefficient of dynamic friction will increase and the convergence will decrease, making it difficult to create uniform loops and sag, which is not preferable.

The oil agent applied to the undrawn polyamide multifilament yarn may be prepared using only mineral oil and an imidazoline compound, but a surfactant such as a nonionic surfactant may also be added.

The lubricant is applied to the undrawn yarn in the form of an emulsion or straight (non-aqueous) using a lubricating means such as a roller or slit during spinning.

Preferably, it is applied as an emulsion.

The amount of oil applied is at least 0.4wt based on the weight of the fiber.
% is necessary, but 0.5 to 0.8 wt% is more preferable in order to reduce dirt on heat pins, guides, etc. of processing machines. If the amount of the oil adhered is less than 0.4 wt%, the coefficient of kinetic friction becomes high (as well as the cohesiveness decreases, which leads to a decrease in workability and unwinding properties, which is not preferable).

In the present invention, polyamide multifilament undrawn yarn to which a small amount of the oil agent (0.4 wt% in both cases) is attached is
It is stretched while being heat treated at 0 to 170°C. The heat treatment increases the latent shrinkage force of the undrawn yarn and causes shrinkage spots, and is preferably carried out using a hot pin. The heat treatment temperature needs to be 110 to 170°C, preferably 130 to 150°C. When the heat treatment temperature is less than 110℃,
Due to fluid turbulence processing, loops and slacks are not formed sufficiently.

On the other hand, if the temperature exceeds 170°C, it is not preferable because i-light cutting increases and processability decreases.Also, the drawing ratio is generally 2.5 to 3.5 times, although it depends on the spinning speed of the undrawn yarn. is preferred.

After drawing the polyamide undrawn yarn while heat treating it, the resulting drawn yarn is subjected to fluid turbulence treatment at a relaxation rate of 5 to 20%, preferably 8 to 15%, without taking a single portion, to remove many loops, sag, and A bulky yarn having entanglements is obtained. If the relaxation rate during fluid turbulence treatment is less than 5%, loops and sag will be difficult to form, while if it exceeds 20%, wrapping around the rollers will increase and workability will decrease, which is not preferable.

Examples of nozzles used for fluid turbulence processing include Taslan nozzles (Cuslan is a DuPont trademark for loop-shaped non-extensible bulk processing) or various fluid turbulence processing nozzles that can provide loops and slack. 12kg
/c+d, particularly preferably by subjecting the polyamide multifilament drawn yarn to fluid turbulence treatment at an air pressure of 8 to 10 kg/cffl.

It is possible to obtain a polyamide bulky yarn that has uniform loops, slack, and entanglements, and has good unwinding properties from a package.

Although it is not clear why the present invention can produce polyamide bulky yarn having the above characteristics, it is possible to use an imidazoline compound as an antistatic agent and apply an oil agent with a large blending ratio of mineral oil and imidazoline compound to the undrawn polyamide yarn. This point and the point in which the yarn was stretched while being heat-treated and then supplied to the fluid turbulence treatment process without being wound up act synergistically during the fluid turbulence treatment to generate uniform loops and slack.

Moreover, it is thought that the unwinding property is improved.

Next, two aspects of the present invention will be explained based on FIG.

The undrawn yarn to which an oil agent satisfying the conditions of the present invention has been applied in the spinning process is once wound up and then transferred to the process shown in FIG. The undrawn polyamide multifilament yarn 1 passes through a feed roller 2 and is drawn between a first delivery roller 4 while being heat-treated with a heating pin 3 at 110 to 170°C. Continuing.

The drawn yarn is fed to the fluid turbulence treatment nozzle 5 with a relaxation rate of 5 to 20%, and is taken into the package 8 one by one through the second delivery roller 6.1 and the one-to-one take-up drum 7.

The mineral oil that is the main component of the oil agent applied to the undrawn yarn in the present invention may be a paraffin-based chain saturated hydrocarbon, or a saturated hydrocarbon having a naphthenic saturated ring in combination with the above-mentioned hydrocarbon. A mixture with hydrogen is used.

In addition, as imidazoline compounds, betaine type amphoteric surfactants such as Na salt of polyoxyethylene lauryl imidazoline, salt of polyoxyethylene oleyl imidazoline, lauryl hydroxyethylimidazolinium ethosulfate, oleyl hydroxyethylimidazolinium ethosulfate, etc. A quaternary ammonium cationic surfactant such as the following is used.

Two further polyamides to which the present invention applies include nylon 6, nylon 66, nylon 46°, nylon 610
Typical examples include fatty acid amides such as (including mixtures and copolymers). Also.

As the polyamide, one containing a matting agent, an antistatic agent, a heat resistant agent, an ultraviolet absorber, a transparency improver, a pigment, etc. may be used.

Note that the cross-sectional shape of each single fiber constituting the polyamide multifilament is not limited to a circular shape, and may have an irregular cross-section such as a trilobal, a flat shape, a hollow ring, or various other cross-sectional shapes.

(Example) Next, the present invention will be explained in more detail with reference to Examples.

Example 1 Using 96% sulfuric acid, concentration 1g/100m7! .

Nylon 6 chips with a relative viscosity (ηr) of 2.58 measured at a temperature of 25°C were melt-spun using an extruder type spinning device at a temperature of 265°C, and the resulting undrawn yarn with a round cross section was Shown in Table 1. A 10 wt % aqueous solution of the above oil composition (Test 11117.10 was a straight oil agent) was applied at a weight ratio of 0.6 wt % (in terms of active ingredient) to the fibers and rolled up. This undrawn yarn was heat-treated at 50°C using a heat pin (diameter: 40 fins).

Stretched at a stretching ratio of 3.10, and then JP-A-57-11
Using the processed yarn nozzle described in No. 2427.

After performing fluid turbulence treatment at an air pressure of 8 kg/c + J and a relaxation rate of 12%, it was rolled up at a speed of 400 m/l 1 inch, and 140
d/96 f(7) bulky yarn was obtained (tests 11hl to 13
).

Chapter 1 Table Note 1: Test Na1aζ is a conventional oil for nylon.

Note 2: Test It (78 marks indicate examples of the present invention, no marks indicate comparative examples.

Further, using the oil agent of Test Magnet 1 in Table 1, bulky yarns were collected under the same conditions except that only the amount of oil agent attached to the fibers was changed (Test Nos. 14 to 16).

The processing and evaluation results are shown in Table 2.

Note that the bulky yarn of the present invention was evaluated by the following method.

(1) Loop, slack Thread samples were prepared using a black mount and ranked according to the following criteria (1 to 5).

1: 50 pieces/m or less 2: 51-100 pieces/m 3: 101-150 pieces/m 4: 151-250 pieces/m 5: 251 pieces/m or more Note that the loop is counted as 1 piece.

The size of the slack is 0.5 m or more.

(2) Unwinding properties The yarn was unwound from the package at a yarn speed of 500 m/win, and the yarn was evaluated for breakage and snagging.

O: Good △: Slightly good ×: Poor (3) Heat bottle stain 400 m of undrawn yarn hung once on a hot pin at 170°C
Picked up at /l1in, 8 hours later.

The contamination on the hot pin was evaluated.

○: No stain Δ: Slight stain ×: Large stain (4) Workability Evaluation was made by observing the winding and cutting of a single yarn onto a roller through the heat treatment, stretching and fluid turbulence treatment steps.

○: Good △: Slightly good ×: Bad As is clear from Table 2, 9 examples of the present invention, Na
The bulky yarns obtained with NQ1-7 and NQ14.15 have uniform loops and slack, and have good unwinding properties.

In addition, there was little dirt on the heating pins, and the processability during bulky yarn production was also good.

Example 2 Nylon 6 chips with ηr2.58 were melt-spun using an extruder type spinning device at a temperature of 265°C.
The obtained undrawn yarn with a round cross section was subjected to test number 1 shown in Table 1.
After applying 0.6 wt% of the oil based on the weight of the fiber and winding it up, processing was carried out in the same manner as in Example 1, except that the heat treatment temperature and relaxation rate of the hot pin were changed, and a 140d/96f
A bulky yarn of 100% was obtained.

The processing and evaluation results are shown in Table 3.

Example 3 Nylon 6 chips with an
The cross-sectional yarn was coated with 0.0% of the test weight lubricant shown in Table 1 at a fiber weight ratio.
It was added 6 wt% and rolled up.

Next, the temperature of a 40-diameter heating pin was set to 130°C.

After stretching at a stretching ratio of 2.80 at 145°C and 160°C, a Taslan processed yarn nozzle was used.

Relaxation rate 15%, air pressure 8kg/aA, It” take-up speed 5
Processing was performed under the conditions of 00m10iin, and the degree of irregularity was 1.50.
A bulky yarn of 140 d/68 f was obtained.

The processing and evaluation results are shown in Table 4.

(Effects of the Invention) Since the present invention has the above-described configuration, the oil agent attached to the undrawn yarn and the undrawn yarn are stretched while being heat-treated.
The fluid turbulence treatment without winding works synergistically to produce polyamide bulky yarn with uniform loops and slack.

There is no need for moisture absorption treatment to generate uniform loops, and the resulting bulky yarn has good unwinding properties, so the oil agent only needs to be applied during the spinning process.

There is no need to apply an oil to the bulky yarn just before winding it up to improve its unwinding properties.

[Brief explanation of the drawing]

FIG. 1 is a schematic process diagram showing one embodiment of the present invention. Undrawn yarn 2: Feed roller 3: Heat bin 4: First delivery roller 5: Fluid turbulence treatment nozzle 6: Second delivery roller 7: Winding drum 8: Package patent applicant Nijikoku Co., Ltd. Sai II ¥1,! J Yoren Uniti is a stock dog rebel

Claims (1)

[Claims] (1) A mineral oil having a redwood viscosity of 50 to 120 seconds (30°C) and an imidazoline compound are prepared by the following formula (I) ~
Polyamide multifilament undrawn yarn to which at least 0.4 wt% of an oil agent that satisfies (III) is attached is 1
It is characterized in that drawing is performed while heat-treating at a temperature of 10 to 170°C, and then fluid turbulence treatment is performed at a relaxation rate of 5 to 20% without winding up the drawn yarn to form loops and slacks. Method for manufacturing polyamide bulky yarn. 60wt%≦a≦90wt%……(I) 8wt%≦b≦30wt%……(II) a+b≧80wt%……(III) However, a is the wt (weight) of mineral oil in the oil agent. %, b indicates wt (weight) % of the imidazoline compound.