JPH08144120A - Production of thermoplastic resin fiber and apparatus therefor - Google Patents

Abstract

PURPOSE: To provide a process for producing a thermoplastic resin fiber and an apparatus for the production of the fiber by simultaneously fibrillating two or more kinds of raw material resins by centrifugal spinning and simultaneously collecting the fibers to form two or more kinds of fibers having different fiber properties in uniformly mixed state. CONSTITUTION: This apparatus for the production of a thermoplastic resin fiber is composed of a spinner for releasing a molten thermoplastic resin polymer through an orifice 17 by centrifugal force to form primary fibers and an air-blowing apparatus 16 to blow a high-speed air flow against the primary fiber to form a secondary fiber. In the above apparatus, two or more spinners are vertically arranged in plural stages and molten polymers of different raw materials are released through the orifices of these spinners.

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 capable of uniformly mixing and forming two or more kinds of fibers having different fiber characteristics by a centrifugal method, and an apparatus for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a method for mixing and forming two or more kinds of fibers having different fiber characteristics by a centrifugal method, as disclosed in Japanese Patent Publication No. 52-332229, a short fiber dropped by a centrifugal method is used. There is a method for producing a mineral fiber mat in which rovings or opened strands are sprayed, and these are uniformly mixed and molded. As another method, as disclosed in Japanese Patent Laid-Open No. 6-166945, a nozzle orifice that guides one resin to a spinning port and a nozzle orifice that guides another resin to a spinning port are on the center line of the nozzle piece. There is a method by a melt blow method using die heads alternately provided in the width direction.

[0003]

In the former example, in the former case, when an attempt is made to obtain a non-woven fabric of thermoplastic resin fibers composed of two or more kinds of materials, two or more kinds of fibers are separately produced by cotton. The cotton must be applied to the dry non-woven fabric manufacturing equipment. And when trying to apply this method, in many cases it is necessary to forcibly open the high-strength cotton that is heat-sealed, and there is a big disadvantage that it must be re-sealed with a binder. . Further, when the fiber is 0.5 d (denier) or less, there is no dry-type nonwoven fabric manufacturing apparatus capable of coping with it. In the latter case,
The resins that can be used in the melt-blowing method are limited to heat-resistant polyolefin-based and polyamide-based resins, and there is a problem that only a combination of resins having similar melt viscosity characteristics can be practically used due to the problem of heat control of the die head.

[0004]

Means for Solving the Problems The present inventors have used a centrifugal method to simultaneously fiberize two or more kinds of raw material resins and simultaneously collect cotton to obtain two or more kinds of fibers having different fiber characteristics. The present invention has been completed for the purpose of providing a method and an apparatus for producing a thermoplastic resin fiber capable of uniformly mixing and forming the same. That is, the method for producing a thermoplastic resin fiber of the present invention is a method in which a molten polymer of a thermoplastic resin is discharged from an orifice of a spinner by centrifugal force to form primary fibers and a high-speed air stream is blown to the discharged primary fibers to generate secondary fibers. In the method for producing a thermoplastic resin fiber to be fibrillated, the spinners are arranged in a plurality of upper and lower stages, and different spinners release molten polymers of different raw materials. Further, the apparatus for producing a thermoplastic resin fiber of the present invention comprises a spinner for releasing a molten polymer of a thermoplastic resin from an orifice by centrifugal force to form a primary fiber, and a secondary fiber by blowing a high-speed air stream on the primary fiber. In order to realize the above, in the apparatus for producing a thermoplastic resin fiber, which comprises an air flow blowing device, the spinners are arranged in a plurality of upper and lower stages. In this case, it is preferable that the spinners arranged in a plurality of upper and lower stages are individually controlled by high frequency heating. Further, it is preferable that the high-speed airflow outlet of the airflow blowing device is provided downward on each extension of the orifices of the spinners arranged in the upper and lower stages. Further, it is preferable that the rotation drive shaft of the spinner is formed of a hollow tube, and the molten polymer as a raw material is supplied to each spinner through the hollow tube.

[0005]

Function: Plural kinds of raw material resins melted by different raw material melting machines are charged into each spinner through each raw material charging pipe. Each molten resin is discharged as a primary fiber from its orifice by centrifugal force from each spinner controlled to a temperature suitable for fiberizing. The discharged primary fibers are made into secondary fibers while being drawn by a high-speed air flow (blast air flow), and are collected on a lower cotton collecting net. At that time, the fibers from the upper spinner and the fibers from the lower spinner are uniformly mixed while being entangled with each other and collected. Therefore, mixed cotton collection is performed simultaneously with fiberization.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a thermoplastic resin fiber manufacturing apparatus according to the present invention, in which 1 is an upper spinner having an outer diameter of 130 mm, an inner diameter of 118 mm and a depth of 30 mm, and 2 in the drawing is
A lower spinner having an outer diameter of 130 mm, an inner diameter of 118 mm, and a depth of 30 mm is shown, and the spinners 1 and 2 are coaxially stacked in two upper and lower layers. A rotary drive shaft 3 is connected to the upper spinner 1 and is rotatable at a desired speed by a motor 5 via a rotary belt 4. Incidentally, reference numeral 6 in the figure denotes a support member for the rotary drive shaft 3. The rotary drive shaft 3 is formed of a hollow tube, and raw material feeding pipes 9 and 10 connected to the raw material melting machines 7 and 8 for the upper and lower spinners 1 and 2 are connected to the upper and lower spinners 1 via the hollow tubes. , 2 respectively. Further, heaters 11 and 12 are provided in the raw material feeding pipes 9 and 10, respectively, so that the molten state of the raw material resin can be maintained until the raw materials are introduced into the spinners 1 and 2. The heating control of the spinners 1 and 2 is performed by the high frequency induction heating device 15 via the upper spinner 1 through the upper spinner heating coil 13 and the lower spinner 2 through the lower spinner heating coil 14. Reference numeral 16 in the figure denotes an air flow blowing device that blows down a high-speed air flow for secondary fiber formation on the extension of the orifices 17 of the spinners 1 and 2. In addition, reference numeral 18 in the drawing denotes an air flow outlet of the air flow blowing device 16.

Thus, according to the above-mentioned manufacturing apparatus, separate molten raw material resins are supplied from the raw material melting machines 7 and 8 through the raw material feeding pipes 9 and 10 into the spinners 1 and 2 which are rotationally driven at a predetermined rotational speed. These raw material resins are supplied and primary fibers are discharged from the orifices 17 of the spinners 1 and 2 and discharged, and a high-speed air stream is sprayed by the air stream spraying device 16 to form secondary fibers. Cotton is collected while being mixed.

FIG. 2 shows another embodiment of the apparatus for producing thermoplastic resin fibers according to the present invention, in which a heat insulating material 19 is interposed between the upper spinner 1 and the lower spinner 2 to facilitate control of the heating temperature. ing. In addition, the air flow blowing device 16 is also provided separately for the upper and lower spinners 1 and 2, so that each air flow outlet 18 can blow a high speed air flow downward on the extension of the orifice 17 of each spinner 1, 2. Secondary fibers can be surely formed in the upper and lower spinners 1 and 2. still,
The same members as those of the above-described embodiment are designated by the same reference numerals in the drawings and their detailed description is omitted.

Next, an example of a manufacturing method in which the above-mentioned manufacturing apparatus is used to make fibers, and mixed and collect cotton is shown. Example 1 Polypropylene (MR002V manufactured by Mitsubishi Yuka Co., Ltd., melting point 167 ° C.) as two kinds of raw material resins,
Melt flow rate 240 g / 10 minutes) and asphalt (pre-powder asphalt manufactured by Showa Shell Co., Ltd., softening point 95 to 120 ° C.) were used. The temperature of the upper spinner was set to 260 ° C, polypropylene was added, the temperature of the lower spinner was set to 200 ° C, and asphalt was added. The spinner was rotated at 3000 rpm, the blast airflow temperature was about 230 ° C., and the fibers were spun into fibers at a jet speed of 300 m / s.

The non-woven fabric obtained was a uniform mixture of white polypropylene fibers and black asphalt fibers. Further, when the average fiber diameter of each was measured, the polypropylene fiber was about 2 μm and the asphalt fiber was about 30 μm. As is clear from the above examples, according to the present invention, it is clear that a mixed nonwoven fabric can be produced from two or more kinds of raw materials.

[0011]

EFFECTS OF THE INVENTION According to the present invention, two or more kinds of raw materials having different fiber characteristics are uniformly mixed and formed by simultaneously centrifuging two or more kinds of raw materials using a centrifugal method and collecting cotton simultaneously. can do. Therefore, conventionally, it was necessary to manufacture a nonwoven fabric using two or more kinds of raw materials,
No need to open the fiber. In addition, since two types of cotton are made simultaneously, there are significant time advantages.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a main part of another embodiment of the device of the present invention.

[Explanation of symbols]

 1 Upper Spinner 2 Lower Spinner 3 Rotating Drive Shaft 4 Rotating Belt 5 Motor 6 Supporting Member 7 Raw Material Melting Machine 8 Raw Material Melting Machine 9 Raw Material Feeding Pipe 10 Raw Material Feeding Pipe 11 Heating Heater 12 Heating Heater 13 Heating Coil 14 Heating Coil 15 High Frequency Induction Heating Device 16 Airflow spraying device 17 Orifice 18 Airflow outlet 19 Thermal insulation

Claims (5)

[Claims] 1. Production of a thermoplastic resin fiber in which a molten polymer of a thermoplastic resin is discharged from an orifice of a spinner by centrifugal force to form a primary fiber, and a high speed air stream is blown to the released primary fiber to form a secondary fiber. In the method, the spinners are arranged in a plurality of upper and lower stages, and molten polymers of different raw materials are discharged from the orifices of the respective spinners. 2. A spinner for discharging a molten polymer of a thermoplastic resin from an orifice by centrifugal force to form primary fibers, and an air flow spraying device for spraying a high-speed air stream onto the primary fibers to form secondary fibers. The thermoplastic resin fiber manufacturing apparatus according to claim 1, wherein the spinners are arranged in a plurality of upper and lower stages. 3. The apparatus for producing a thermoplastic resin fiber according to claim 2, wherein the spinners arranged in a plurality of upper and lower stages are separately heated and controlled by high frequency heating. 4. The high-speed airflow outlet of the airflow blowing device is provided downward on each extension of the orifices of the spinners arranged in the upper and lower stages. 3. The thermoplastic resin fiber manufacturing apparatus according to item 3. 5. The spin drive shaft of the spinner is formed of a hollow tube, and the molten polymer as a raw material is supplied to each spinner through the hollow tube.
An apparatus for producing a thermoplastic resin fiber according to any one of 1.