JPH01183511A - Flow straightening cylinder for spinning - Google Patents

Abstract

PURPOSE:To provide a spinning flow-straightening cylinder controlling the complicated flow of a solution in a bath without producing the differences in the temperature and concentration of the bath solution between the interior and exterior of the spinning flow-straightening cylinder, thereby permitting to provide spun fibers having a high maximum draw ratio in a state free of the disturbance of the spun fibers. CONSTITUTION:A porous material such as a metal net or punched metal is used as a material for the cylindrical member of a spinning flow-straightening cylinder 1 for a dry-wet type or gel type spinning method and the upper terminal portion of the spinning flow-straightening cylinder 1 is exposed above a coagulating bath solution or cooling bath solution 5. Thereby, the cylinder permits to reduce the differences in the temperature and concentration of the bath solution between the interior and exterior of the spinning flow-straightening cylinder to <=1 deg.C and <=1%, respectively, to decrease the disturbance and fluctuation of spun fibers 3 and to control the flow of the solution in the bath 6 and the coagulation rate or cooling rate of the solution.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to a novel spinning straightener, particularly to a filter spinning straightener used in wet-dry or gel spinning methods.

(Prior art) The conventional wet-dry or gel spinning method is a spinning method in which a polymer solution iα is discharged from a spinning orifice into a gas phase, and then coagulated fibers or gel fibers are introduced into a coagulating bath or a cooling bath. be. In such spinning methods, it is necessary to supply a certain amount of coagulation liquid or cooling liquid into the bath in order to coagulate or gel the fibers quickly and uniformly. The disadvantage is that the resulting liquid flow disturbs the fibers immediately after spinning, making it impossible to perform spinning in a steady state, and in the case of four-end spinning, fibers may even adhere to each other in the gas phase, resulting in poor quality fibers. there were.

In order to solve these drawbacks, Japanese Patent Application Laid-Open No. 59-16810
9. In JP-A-59-228012, a funnel-shaped flow tube is installed in a coagulation bath or a cooling bath.

Although spinning is performed in a steady state, since the flow tube is constructed of a vibrator or a general plate material, there is a drawback that a temperature difference and a concentration difference occur in the bath liquid between the inside and outside of the flow tube. In addition, since the flow tube does not surround the spinning orifice and is installed at a distance, the influence of the flow in the bath when the fiber enters the bath liquid from the gas phase is large, and the resulting coagulated fiber Alternatively, there is a drawback that the quality of the gel fiber is deteriorated.

(Problems to be Solved by the Invention) The wet-dry or gel spinning method according to the present invention involves first discharging a nine-polymer solution from a spinning nozzle into a gas phase, and then coagulating or introducing it into a cooling bath liquid. It is. As a result, coagulation or gel formation can be performed under low draft and low tension, and coagulated fibers or gel fibers with excellent stretchability can be obtained. therefore.

Controls the temperature and concentration of coagulation bath or cooling bath liquid.

Controllability and, in addition, reducing the influence of liquid flow within the bath improves the spinning stability and the quality of the final drawn yarn obtained by drawing the coagulated and gel fibers.

In particular, when producing high-strength, high-modulus fibers, it is known that improving stretchability has a great effect on improving strength and modulus.
It has become essential to control the solidification or cooling environment represented by the concentration or liquid flow within the bath.

In view of the above points, the inventors of the present invention have developed a spinning machine installed immediately after the spinning nozzle! ! This is the result of careful consideration of the flow cylinder.

We have arrived at the present invention. In particular, we provide a spinning straightener that can easily and efficiently control complex liquid flow within a bath without creating a temperature or concentration difference between the inside and outside of the spinning straightener to produce high-quality fibers. The purpose is to

(Means to solve the problem) The present invention has the following configuration.

The spinning rectifier tube in wet-dry or E or gel spinning methods.

Spinning comprising a cylindrical member made of a porous material, and installed immediately after the spinning nozzle so that the upper end of the spinning straightener is exposed above the coagulation bath liquid or cooling bath liquid surface. Rectifier tube.

The present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an embodiment of the spinning straightener according to the present invention, where 1 is the spinning straightener and 2 is the spinning nozzle.

3 is a spun yarn, 4 is a direction change guide, 5 is a coagulating liquid in wet/dry spinning, and 6 is a cooling soak in gel spinning.
FIG. 2 shows a coagulation bath in dry-wet spinning and a cooling bath in gel spinning.

3, 4, and 5 show the spinning straightening member of the present invention, in which 11 is a cylindrical member of the straightening cylinder main body, 12 is a reinforcing member in the circumferential direction of the cylindrical member, and 13 is a cylindrical member. axial reinforcement of the member;
14 shows a figure formed by connecting the centers of the outermost discharge holes of the spinning nozzle.

That is, 9 spinning in the present invention! ! Examples of the cylindrical member of the flow tube include porous materials such as wire mesh and punched metal, but the cylindrical member may be any cylindrical member made of a porous material that retains its shape, and is not limited to these materials.
- Shell plate materials and vibrators cause significant temperature and concentration differences between the inside and outside of the spinning straightener, resulting in poor uniformity. In other words, the cylindrical member has an opening made of wire mesh, punched metal, etc. that allows the bath liquid to flow between the inside and outside of the spinning rectifying cylinder so that there is no temperature difference or concentration difference between the inside and outside of the spinning straightening tube. A porous material is preferable.The porosity (ratio of average pore area to unit area) is preferably 0°2 or more and 0.6 or less.If it is larger than 0.6, the influence of t1!2 flow is reduced. It becomes difficult to control completely, and if it is smaller than 0.2, the flow of the bath liquid between the inside and outside of the spinning rectifier cylinder becomes insufficient, and a temperature difference of 811 degrees tends to occur. Especially good running is 0°3 or more and 0.5 or less.

In addition, the installation position of the spinning straightening tube is from the upper end of the spinning straightening tube to the solidification t? For one liquid, it is essential that the distance yffll11 to the cooling bath liquid level be 0<y and that the upper end of the rectifying cylinder be above the liquid level (in the gas phase). If the upper end of the spinning straightener is not exposed above the liquid level and the entire straightener is completely submerged in the coagulation bath or cooling bath overnight, the spinning straightener is once discharged into the gas phase from the spinning nozzle. When the fibers are introduced into the coagulation bath liquid or cooling bath liquid, they are affected by the liquid flow in the bath.

Coagulation or quenching cannot be performed under low draft or low tension, and only coagulated fibers or gel fibers with extremely poor drawability can be obtained. Or if it is exposed above the cooling bath liquid level,
It is possible to significantly reduce the influence of the liquid flow in the bath when the spun fibers are introduced into the coagulation bath liquid or cooling bath liquid, and it is possible to obtain coagulated tali fibers or gel fibers with excellent drawability. can.

In addition, the cross-sectional shape of the cylindrical member is not limited to the circle or rectangle shown in the figure, but may also be any polygon or ellipse. The inner dimensions and cross-sectional shape of the spinning rectifier tube on the side opposite to the spinning nozzle may be arbitrary, and may be tapered as shown in FIG. 4 or as shown in FIG. 5 as necessary. You can choose a cylindrical body with a thick tip as shown in the figure.

The inside dimensions and cross-sectional shape of the rectifying tube spinning nozzle are as follows.

For the figure formed by connecting the centers of the outermost discharge holes of the spinning nozzle,
It is preferable that the cross-sectional shape is such that the gap width εmm satisfies 5≦ε≦100 on the outside.If ε is larger than 100, the bath liquid will easily flow in from the lower part of the spinning straightening cylinder, so that the yarn will not be disturbed. If ε is smaller than 5, there is a tendency for the yarn to easily come into contact with the spinning straightener due to slight disturbance of the yarn. Particularly preferably, 1
0≦ε≦50.

The length of the spinning straightening tube is p or more, when the maximum distance between the centers of opposing outermost discharge holes of the spinning nozzle is pmm,
It is preferable that pXlo is 0 or less; if pXlo is greater than 0, it will be difficult to take out the yarn at the start of spinning; ! The yarn tends to flow into the lower part of the flow cylinder, causing disturbance of the threads.

There is a direction around 1 which makes it easier to reduce the stretching ratio in the subsequent process.

Particularly preferably pX2.0 or more, pX5. It is less than or equal to 0.

Note that the polymer solution used for spinning using the apparatus of the present invention was polyethylene and propylene.

Poly-4-methyl-1-pentene, fully aromatic polyamide, polyacrylonitrile, poly(vinylidene fluoride),
Wet and dry method using polyvinyl alcohol, etc.

It is made by dissolving a fiber-forming polymer suitable for gel spinning in a solvent for the polymer, and is not particularly limited.

(Function) In the apparatus of the present invention, the material of the cylindrical member of the spinning straightening tube is made of a porous material, and the upper end of the spinning straightening tube is exposed from the coagulation bath liquid or the cooling bath liquid. The temperature difference between the bath and the outside is 1℃ or less, the concentration difference is 1% or less, reducing disturbance and curling of the spun yarn, and making it possible to control the liquid flow in the bath and the solidification rate or cooling rate. And so.

The present invention will be explained in more detail below with reference to Examples.

Note that the distance from the upper end to the liquid level in this example 9 defines the mounting position of the spinning straightening tube, and the (+) symbol indicates the distance between the upper end of the straightening tube and the liquid level of the coagulation bath. The upper end of the rectifying cylinder is exposed above the liquid level, and the (-) symbol indicates that the upper end of the rectifying cylinder is submerged in the liquid. A 4x pre-stretching was carried out in a methanol bath.

When the yarn is subsequently dried and then post-stretched in a heated air stream at 240°C, this is the total stretching ratio at which all the yarns are cut in the post-stretching process, and the total stretching ratio is at least 22 times or more. Otherwise, fibers with the target strength-elasticity modulus cannot be obtained.

The ease of the spinning start operation refers to the ability of the free-falling fibers discharged from the spinning nozzle to pass through the spinning straightening cylinder at the start of spinning (o; when the fibers do not contact the spinning straightening cylinder at all; Δ; when the fibers do not contact the spinning straightening cylinder at all; (if there is slight contact).

Example 1 A mixture of 12% by weight of polyvinyl alcohol with a number average molecular weight of about 170,000 and 88% by weight of dimethyl sulfoxide was
Melted at 0°C, using a spinning nozzle with a pore diameter of 0°1 mm and a center-to-hole diameter of the outermost discharge hole in the spinneret of 1001/1, 85% by weight of methanol/dimethylsulfoxy at a liquid temperature of 15°C was used. Wet-dry spinning was carried out in a solution containing 15% by weight of F' using a spinning straightener shown in FIG. That is, the spun yarn is 10
vertically downward in the liquid at a speed of rn/min to 20 m/min.
After running for 000 man, the running direction was changed diagonally upward by a direction changing guide, and after coming out of the liquid, it was taken up by a take-up roller. Also, pour 500'l of methanol upward from the bottom of the spinning nozzle. ;C/hour was supplied. At that time, the cylindrical member was made of 40 meshes of wire mesh (porosity: 237°0%), and had an inner dimension of φ150 mm (·ε=25) and a length of 450 mm (p=0.45). 5. Place the cylinder so that its upper end is above the liquid level of the coagulation bath. It was installed so that On+m was exposed.

As a result, temperature difference (inside the rectifier tube - outside the rectifier tube) = 0.5℃
The concentration difference (inside the straightening tube - outside the straightening tube) was 0.6%, and a coagulated fiber having a maximum stretching ratio of 23.0 times was obtained. Furthermore, the spun yarn did not come into contact with the spinning straightener at all.

Example 2 The same polymer solution as in Example 1 was used, and the pore sizes were 0 and 1.
Using a rectangular spinning nozzle with a diameter of 2 mm and a distance between the centers of opposing outermost discharge holes in the nozzle of 10100 mm x 200 mm, dry-wet spinning was carried out in a liquid containing 85% by weight of methanol/15% by weight of dimethyl sulfoxide at a liquid temperature of 20°C. . The spun yarn is 15
vertically downward in the liquid at a speed of 10 m/min to 20 m/min.
Traveled 00mm.

The direction change guide changes the running direction diagonally upward.

After coming out of the liquid, it was picked up by a take-up roller.

In addition, the coagulation liquid was applied at 250° C. perpendicularly to the running direction of the yarn.
07K/hour was supplied. At that time, punching metal (hole diameter: φ3 mm, pitch between holes: 5.0 mm) was used as the cylindrical member.
, porosity: 32.6%).

Inner dimensions 140mm (ε±20) x 240mm (ε=20)
, a spinning rectifier tube with a rectangular cross section and a length of 400 questions (p=0.4) is placed such that its upper end is 10 mm above the coagulation bath liquid level.
It was installed so that 0 mm was exposed.

As a result, the temperature difference (inside the rectifier tube - outside the rectifier tube) = 0, 4
'C, -a degree difference (inside the rectifier tube - outside the rectifier tube) = 0.3%
Thus, a coagulated fiber having a maximum draw ratio of 22.5 times was obtained. Furthermore, the spun yarn did not come into contact with the spinning straightener at all.

Example 3 Using the same polymer solution as in Example 1, wet-dry spinning was carried out under the same spinning conditions and feed liquid amount as in Example 2.

At that time, punching metal (hole diameter: φ1) is used as the cylindrical member.
1.5mm, hole pitch: 14. 0mm, open area ratio:
(31,5%), internal dimension 1/, L Omm
(ε=20) X 2-40mm (ε=20),
A spinning rectifying cylinder having a length of 400 mm (p=0.4) is placed so that its upper end is above the coagulation bath liquid level. It was installed with an exposure offset of 0 mm.

As a result, temperature difference (inside the rectifier tube - outside the rectifier tube) = 0.3℃
, -a degree difference (inside the straightening cylinder - outside the straightening cylinder) = 0.3%, but the maximum draw ratio was 21.5 @, which was slightly lower than 22 times. Also.

At the start of spinning, the flow rate of the bath liquid flowing into the straightening cylinder increased, so the turbulence and curling of the fibers increased somewhat.

Comparative Example 1 The same polymer solution as in Example 1 was used, and dry-wet spinning was performed under the same spinning conditions and feed liquid amount as in Example 1.

At that time, no spinning straightener was installed.

As a result, the temperature difference (inside the straightening tube - outside the straightening tube) = 0℃, and the concentration difference (inside the straightening tube - outside the straightening tube) = θ%, but the maximum stretching ratio = 17.8 times and the target value of 22 times. However, very low fiber content was obtained.

Comparative Example 2 Using the same polymer solution as in Example 1, dry-wet spinning was carried out under the same spinning conditions and feed liquid amount as in Example 1.

At that time, it is composed of a pipe (porosity: 0%), and the internal dimension φ
1'50 ml (C=25) to length 450
mm (p=0.45), the upper end of which is 8.mm (p=0.45) above the coagulation bath liquid level. It was installed so that 0 mm was exposed.

As a result, the temperature difference (inside the rectifier tube - outside the rectifier tube) = 2, 5
゛C, concentration difference (inside the straightening tube -!! Outside the flow tube = 3.0%
Therefore, the target values of 1° C. or lower and 1% or lower could not be achieved, and the maximum stretching ratio was 20.8 times, which was lower than the target value of 22 times.

Comparative Example 3 Using the same polymer solution as in Example 1, dry-wet spinning was carried out under the same spinning conditions and feed liquid amount as in Example 1.

At that time, punching metal (hole diameter: φ3) is used as the cylindrical member.
+nm, hole pitch: 5. 0mm, open area ratio = 32゜6%), internal dimensions 102mm (ε = 1) x 20
2mm (ε=1), length 400mm (p=0.4)
A spinning straightening tube having the shape of was placed at a position where its upper end was 10.0 mm from the tα plane of the coagulation bath, that is, at a position where the straightening tube was completely submerged in the bath liquid.

As a result, temperature difference (inside the rectifier tube - outside the rectifier tube) = 0.2℃
, 1 degree difference (inside the straightening cylinder - outside the straightening cylinder) = 0.1%, but the maximum stretching ratio = 18.6 times, which was much lower than the target 1fi22 times, was obtained.

Below, the above Examples 1 to 3. The results of Comparative Examples 1 to 3 are summarized in Table 1.

(Left below) (Effects of the invention) (1) Spinning! The temperature difference and the fi degree difference between the inside and outside of the i-stream cylinder can be reduced, and high-quality fibers with a high maximum draw ratio can be obtained.

(2) It is possible to control the liquid flow in a complex bath, and a stable spinning state without yarn holes can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the spinning straightener according to the present invention,
FIGS. 2, 3, 4, and 5 show other embodiments of the spinning straightener of the present invention. 1... Spinning straightening tube 2... Spinning nozzle 3... Spun yarn 4... Direction changing guide 5... Coagulating liquid in wet/dry spinning, cooling liquid 6 in gel spinning ...In dry-wet spinning, coagulating bath; in gel spinning, cooling bath 11...Cylindrical member 12 of the straightening cylinder body...Reinforcement material 13 in the circumferential direction of the tubular member...Typical member Reinforcing material 14 in the axial direction of...A figure p formed by connecting the centers of the outermost discharge holes of the spinning orifice...Maximum value p of the center-to-center distance of the outermost discharge holes of the spinning orifice
...1) Equivalent value

Claims (1)

[Claims] The spinning straightener in the wet-dry or gel spinning method is composed of a cylindrical member made of a porous material, and the upper end of the spinning straightener is exposed above the coagulation bath liquid or cooling bath liquid surface immediately after the spinning nozzle. A spinning rectifier tube characterized by being installed in.