JPH07173707A - Production of thermoplastic resin fiber and production unit therefor - Google Patents

Abstract

PURPOSE:To provide a production method for thermoplastic resin fibers so designed that thermoplastic resin pellets are heated and melted in an internal space dividedly formed by the inner peripheral wall of a spinner and the melt is delivered by a centrifugal force via the external space, thereby, accomplishing fiber formation by simply charging the resin pellets without the need for a separate melting device. CONSTITUTION:Thermoplastic resin pellets are heated and melted in an internal space dividedly formed by the inner peripheral wall of a spinner 1 and then released by centrifugal force into an external space 4 through an orifice 9 in the inner peripheral wall. The melt, which is then further heated and melted in the external space, is delivered by centrifugal force through an orifice 10 in the outer peripheral wall 5 and brought to primary fiber formation followed by secondary fiber formation by high-temperature air spraying.

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 thermoplastic resin fiber and an apparatus for producing the same.

[0002]

2. Description of the Related Art As a method for producing a thermoplastic resin fiber,
In Japanese Patent Application No. 4-101670, after melting a thermoplastic resin in a melting device, a molten polymer is charged into a spinner and discharged from a spinner orifice by centrifugal force to form primary fibers, and the released primary fibers A method has been proposed in which the fibers are drawn out while being cooled by a high-speed air stream to form secondary fibers. Further, although it is not a method for producing a thermoplastic resin fiber but a method for producing a glass fiber, a centrifugal method is known as a method for producing the same fiber. This centrifugation method
A large melting device called a furnace melts glass pellets, puts the molten glass into a spinner, discharges it from the spinner's orifice by centrifugal force to form primary fibers, and blows a high-temperature air stream from it in the vertical direction to secondary fibers. It will be transformed.

[0003]

The melting apparatus used in the above-mentioned prior art and glass fiber manufacturing method requires a large amount of equipment and various know-how such as a heating method.
Further, a method of directly charging the thermoplastic resin pellets to the spinner without using a melting machine is also conceivable, but in that case, the heat cannot be uniformly transferred to the resin, so that the resin can be melted but cannot be melted uniformly. . Therefore, there are many problems in the generated fibers because of variations and shots. Then, this invention aims at providing the manufacturing method and its manufacturing apparatus which directly introduce | transduces a thermoplastic resin pellet into a spinner, melts resin uniformly, and fiberizes by a centrifugal force, without using a melting device. .

[0004]

Means for Solving the Problems The present inventors have found that a molten polymer is in a state of being uniformly melted when it is discharged from a spinner, without requiring auxiliary equipment such as a melting device. The present invention has been completed for the purpose of supplying raw materials in the form of pellets. That is, the method for producing a thermoplastic resin fiber of the present invention, the thermoplastic resin pellets are supplied to the internal space defined by the inner peripheral wall of the spinner, heated and melted, and centrifugally applied to the inner wall from the orifice of the inner peripheral wall. The melt is discharged to the external space defined by the peripheral wall and the outer peripheral wall, and then the discharged melt is discharged from the orifice of the outer peripheral wall by centrifugal force to form primary fibers, and the released primary fibers In addition, it is characterized in that a high-temperature airflow is blown to form secondary fibers. The hot air stream is normally blown perpendicularly to the primary fibers, but the blowing direction is not particularly limited. Further, the apparatus for producing a thermoplastic resin of the present invention for carrying out the above-mentioned production method, an inner peripheral wall for partitioning and forming an inner space and an outer space is provided in a spinner having an orifice on an outer peripheral wall, and the inner peripheral wall It is characterized in that an orifice is provided.
In the manufacturing apparatus, it is preferable that the orifice of the inner peripheral wall is provided below the inner peripheral wall, and the orifice of the outer peripheral wall is provided above the outer peripheral wall.

[0005]

[Function] The thermoplastic resin pellets supplied to the inner space of the spinner are heated and melted (non-uniform or incomplete) on the spinner bottom wall, the spinner top wall and the inner peripheral wall, and at the same time, the melt is centrifuged from the orifice of the inner peripheral wall. It is discharged into the external space by force, collides with the outer peripheral wall, and is further heated and melted by the spinner bottom wall, the spinner upper wall and the outer peripheral wall. If the orifice of the inner wall is located lower than the orifice of the outer wall, the melt discharged from the orifice of the inner wall will not be directly discharged from the orifice of the outer wall and will always collide with the outer wall. Will be more complete.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows an embodiment of the manufacturing apparatus of the present invention.
Is a plan sectional view of the spinner, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG.
In the figure, 1 is an outer diameter of 110 mm, an inner diameter of 100 mm, and a depth of 40.
mm stainless steel cylindrical spinner, thickness 5
Although the thickness is mm, the lower part has a thickness of 13 mm for stability when rotated. The spinner 1 is divided into an inner space 3 and an outer space 4 by an inner peripheral wall 2, and an outer peripheral wall 5 outside the outer space 4 is the outermost part of the spinner 1. That is, the inner space 3 is formed by the inner peripheral wall 2, the spinner upper wall 6, the spinner bottom wall 7, and the wall surface of the rotary drive shaft 8, and the outer space 3 is the inner peripheral wall 2, the spinner upper wall 6, and the spinner bottom wall 7. And the outer peripheral wall. The inner peripheral wall 2 is
The side of the spinner bottom wall 7 is 4 mm from the outer peripheral wall 5, and the side of the spinner top wall 6 is a circular truncated cone shape with a thickness of 5 mm so as to be located on the surface connecting the positions of 5 mm from the outer peripheral wall 5. , 0 from the center of the spinner 1 toward the circumference
Four internal holes 9 having an inner diameter of 0.9 mm and a total length of 5 mm are provided at positions of 7 mm from the spinner upper wall 6 at respective positions of 90 °, 180 ° and 270 °. On the outer peripheral wall 5, the inner peripheral wall 2 extends in the circumferential direction from the center of the spinner 1.
Centered between the inner orifices 9, ie 45 °, 135
4 places 31mm from the spinner top wall 6 at each position of 225 °, 315 °, inner diameter 1.2mm, total length 5mm
An outer orifice 10 is provided. In addition, spinner 1
The heating means may be selected from burner flame, induction heating and the like.

According to the above manufacturing apparatus, the thermoplastic resin pellets supplied to the internal space 3 are heated by the centrifugal force to the spinner top wall 6, the spinner bottom wall 7 and the inner peripheral wall 2.
Is melted by and is discharged into the outer space 4 from the inner orifice 9 by the centrifugal force. The discharged melt collides with the outer peripheral wall 5 and the spinner upper wall 6 and the spinner bottom wall 7
And is completely melted by the outer peripheral wall 5, and by centrifugal force,
The uniform primary fibers are discharged from the outer orifice 10. The primary fibers can be made into short fibers by blowing a high-temperature air flow (blast air flow) from the vertical direction, stretching and cutting.

Next, using the above-mentioned apparatus, a production example of primary fiberization using three kinds of thermoplastic resins having different melt flow rates will be shown. The spinner is heated by induction heating, and the spinner temperature is obtained by measuring the infrared temperature of the upper part of the spinner. (Example 1) Using polypropylene (PS6900 manufactured by Chisso Corporation, melting point 173 ° C, melt flow rate 75) as a thermoplastic resin, spinner temperature about 230 ° C, spinner rotation speed about 3000 rpm, blast airflow temperature about 2
Fiberization was performed under the conditions of 20 ° C. and a blast airflow ejection speed of about 136 m / s. When the average fiber diameter of the obtained thermoplastic resin fiber was examined, it was 2.0 μm and the standard deviation was 1.1.

Example 2 Polypropylene as a thermoplastic resin (PS5700 manufactured by Chisso Corporation, melting point 176)
℃, melt flow rate 35.5), spinner temperature about 230 ℃, spinner rotation speed about 3000 rpm, blast airflow temperature about 220 ℃, blast airflow jet speed about 13
Fiberization was performed under the condition of 6 m / s. When the average fiber diameter of the obtained thermoplastic resin fiber was examined, it was 4.1 μm, and the standard deviation was 2.3.

Example 3 Polypropylene as a thermoplastic resin (FA310 manufactured by Showa Denko KK, melting point 171)
℃, melt flow rate 5), spinner temperature about 2
Fiberization was performed under the conditions of 40 ° C., spinner rotation speed of about 3000 rpm, and blast airflow ejection speed of about 136 m / s. When the average fiber diameter of the obtained thermoplastic resin fibers was examined, it was 5.1.
It was μm and the standard deviation was 2.6.

As is apparent from the above-mentioned Examples, the primary fibers produced according to the present invention were about 2 to 5 μm in spite of the fact that the pellets were introduced without using the melting device. From these facts, it is clear that according to the present invention, a melting device is not required for producing the thermoplastic resin fiber using the spinner.

[0012]

EFFECTS OF THE INVENTION Conventionally, a melting device for resin pellets used as a raw material has been required for producing thermoplastic resin fibers, but according to the present invention, the melting device is not required.
Therefore, the know-how and equipment cost necessary for the melting device are unnecessary.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the device of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 1 Spinner 2 Inner wall 3 Inner space 4 Outer space 5 Outer wall 6 Outer wall 6 Spinner top wall 7 Spinner bottom wall 8 Rotation drive shaft 9 Inner orifice 10 Outer orifice

Claims (4)

[Claims] 1. A thermoplastic resin pellet is supplied to an internal space defined by an inner peripheral wall of a spinner to be heated and melted, and the inner peripheral wall and an outer peripheral wall are partitioned from an orifice of the inner peripheral wall by centrifugal force. The melt is discharged to the external space, and then the melt is discharged by centrifugal force from the orifice of the outer peripheral wall to be made into primary fibers, and a high-temperature air stream is blown to the discharged primary fibers to produce a secondary fiber. A method for producing a thermoplastic resin fiber, characterized in that it is made into the next fiber. 2. The method for producing a thermoplastic resin fiber according to claim 1, wherein the high-temperature air stream is blown onto the primary fibers in a vertical direction. 3. An apparatus for producing a thermoplastic resin fiber, characterized in that an inner peripheral wall for partitioning and forming an inner space and an outer space is provided in a spinner having an orifice in the outer peripheral wall, and the orifice is provided in the inner peripheral wall. . 4. The manufacturing apparatus according to claim 3, wherein the orifice of the inner peripheral wall is provided below the inner peripheral wall, and the orifice of the outer peripheral wall is provided above the outer peripheral wall.