JP2001288667A - Spirally accumulated nonwoven fabric of centrifugally spun filament, method of producing the spirally accumulated fabric, latitudinally paralleled filament nonwoven fabric, and method of producing the latitudinally paralleled fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spirally accumulated nonwoven fabric (spirally accumulated web) made of filaments having a finer yarn diameter than ever, to provide a method of producing the spirally accumulated web, improved in productivity by spinning the filaments through a centrifugal spinning process to increase a spinning speed, to provide a latitudinally paralleled nonwoven fabric (latitudinally paralleled web), and to provide a method of producing the latitudinally paralleled web. SOLUTION: This method of producing the spirally accumulated web of the centrifugally spun filaments comprises injecting filaments from spinning holes of a rotary disk, or injecting from spaces near to the spinning holes together with hot air, then catching the injected filaments in air downward blowing along a collecting ring which is located outside the rotary disk at a certain distance from the disk further making the caught filaments downward advance together with the air and finally transferring the advanced filaments onto a belt horizontally traveling below the rotary disk, and the spirally accumulated web of the centrifugally spun filaments is produced by the method. The method of producing the latitudinally paralleled web comprises transversely drawing the spirally accumulated web of the centrifugally spun filaments, and the latitudinally paralleled web is produced by the method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spirally integrated nonwoven fabric (hereinafter referred to as a spirally integrated web) of centrifugally spun filaments and a method for producing the same, a weft-parallel filament nonwoven fabric (hereinafter referred to as a weft-parallel web) and a method for producing the same. In particular, the present invention relates to a method for producing a spiral accumulated web and a weft-parallel web composed of filaments having a fine fiber diameter with high productivity, and relates to a method used for a horizontally laminated nonwoven fabric such as a weft web.

[0002]

2. Description of the Related Art Various methods have been proposed for producing fibers by centrifugal spinning because of their high productivity despite the simple equipment (Japanese Patent Publication No. 33-962).
No., JP-B-41-19606, etc.). However, these blow off the polymer injected from the spinning spinning hole,
Most of them were to be recovered as short fibers, and the strength of the fibers was weak. By making these into long fibers (hereinafter referred to as filaments), stretching becomes possible,
It has been proposed by the present inventors that the strength of the web can be increased and that a wide web of filaments can be continuously produced (Japanese Patent Publication No. 57-60462, Japanese Patent Publication No. 57-35301, Japanese Patent Publication No. Sho 59-59). 39539, JP-B-60-52228). However, since the filaments of the weft-parallel web are present independently one by one, ear materials are required to maintain the shape of the web at the time of lamination of the orthogonally laminated nonwoven fabric, and even if there is a connection in the width direction, long ears are required. Since there is no connection in the vertical direction, there is also a problem that if there is any slack, the weft-parallel web becomes curved or S-shaped when the lamination is performed. However, with the development of orthogonally laminated nonwoven fabrics in recent years, wide weft-parallel webs having higher productivity have been demanded, and filaments having finer fiber diameters have been demanded in terms of quality. Have been. Accordingly, in the present invention, intensive studies have been made to solve these problems, and the following invention has been attained.

[0003]

That is, the present invention has been developed in order to further improve the productivity and the quality of the inventors of the present invention. To increase productivity by increasing the spinning speed, and by increasing the spinning speed,
A spiral laminated web comprising filaments having a finer fiber diameter and a production method, and a weft-parallel web and a production method are made possible. Another object is to increase the draft ratio in spinning and increase the spinning speed, thereby making it possible to further reduce the fiber diameter. That is, a thermoplastic polymer filament spun by a conventional centrifugal spinning method (hereinafter referred to as a filament)
However, in a case where the filaments are collected in a horizontal arrangement in the collecting ring (for example, Japanese Patent Publication No. 57-60462), the circumferential value of the collecting ring is changed by the rotation of the spinning hole. It is performed only by the value obtained by dividing by the value, which is an order of magnitude smaller than that of ordinary filament spinning, which is the reason that the fiber diameter in centrifugal spinning cannot be reduced. Also,
Since the rotating disk of the open-to-atmosphere type is spun at the injection pressure applied to the spinning hole by centrifugal force, the viscosity of the molten resin is low to facilitate spinning, and the spinning hole must be large. In spite of the large fiber diameter, spinning was mainly used. In the present invention, by increasing the draft magnification, it is possible to reduce the fiber diameter. Still another object is to inject high-temperature hot air from the vicinity of the spinning hole of the rotating disk to increase the spinning speed, increase the productivity, and enable the production of a filament having a fine fiber diameter. Still another object is to enable the production of a belt-shaped spiral laminated web by transferring the filament to a belt running horizontally below a rotating disk. Another object is to improve the arrangement of filaments in the horizontal direction while expanding the spiral laminated web formed by the above-described method in the horizontal stretching step in the horizontal direction, to increase the width, and to increase the productivity. By performing the horizontal stretching, a finer fiber diameter can be obtained, and by performing the horizontal stretching, the strength in the horizontal direction can be increased.

[0004]

SUMMARY OF THE INVENTION The present invention is a spirally laminated web of centrifugally spun filaments and a method of making the same, a weft-parallel web and a method of making the same, wherein the centrifugally spun filament spirals around the width of the product. A spirally-stacked nonwoven fabric of centrifugally spun filaments, which are formed so that their spiral shapes are slightly shifted in the direction of flow, and a weft-parallel filament nonwoven fabric obtained by horizontally stretching this. Further, according to the present invention, a filament is injected from a spinning hole of a rotating disk, a collecting ring is provided outside the rotating disk at a distance from the rotating disk, and the injected filament is blown downward by air blown along the collecting ring. A spirally-stacked web of centrifugally spun filaments, receiving the filaments and moving the filaments downward with air to a belt running horizontally beneath a rotating disk and a process for producing the same. Furthermore, the present invention is a method for producing a spirally integrated web of centrifugally spun filaments by providing a guide plate in a horizontal direction below the above-mentioned rotating disk and passing downward air through a gap between the collecting ring and the guide plate. . Further, in the present invention, a nozzle for blowing air in a tangential direction of the collecting ring is provided on a receiving surface of a filament of air blowing downward along the above-described collecting ring, and the air blowing from the nozzle is rotated in a rotating direction of the rotating disk. This is a method for producing a spirally accumulated web of centrifugally spun filaments by blowing in the opposite direction.
Further, the present invention is a method for producing a spirally integrated web of centrifugally spun filaments by blowing hot air from above and below a spinning hole of a rotating disk. Furthermore, the present invention is a weft-parallel web by embossing the above-described spirally-stacked web of centrifugally spun filaments and stretching it horizontally, and a method for producing the same.

The thermoplastic polymers used in the present invention include polymers used as fibers such as polyolefins such as polyethylene and polypropylene, polyvinyl chloride resins, polyamides, polyethylene terephthalate, polyvinyl alcohol resins and fluorine resins, and copolymers thereof. Polymers and those containing a plasticizer and a solvent therein are also used. Also, a blend of these polymers or a web in which different polymers are spun from different spinning holes to form filaments of different polymers can be used. The viscosity of the molten polymer injected from the rotating disk is preferably 500 to 5000 Pascal second, and more preferably 5 to 5 in the case of an open-air rotating disk.
00 to 2000 Pascal seconds are used. However, in an air-tight rotating disk described later, a disk having a higher melt viscosity is also used. These viscosities are determined by the chemical type of the polymer, the degree of the polymer from the degree of polymerization and the degree of polymerization distribution, and operating conditions such as the rotating disk temperature.

A spinning disk for centrifugal spinning has a large number of spinning holes provided in a circumferential direction, and injects a molten polymer by a jet pressure applied to the spinning holes by a centrifugal force of rotation and extrudes the filament. . In the case of a rotating disk which is open to the atmosphere, spinning tends to be unstable due to turbulence generated during rotation, and the surrounding air is cooled to make the spinning unstable. Spraying hot air from above and below in the vicinity prevents cooling and is therefore effective for stable spinning. In addition, it is possible to reduce the diameter of the spinning hole and spin a filament having a small fiber diameter. In addition, as a rotating disk, a closed-type rotating disk (Japanese Unexamined Patent Publication No.
108704), and centrifugal spinning using the above-described collection ring is also possible. The rotation speed of the rotating disk is preferably from 500 rpm to 3500 rpm,
More preferably, from 1000 rotations / minute to 2500 rotations / minute
Minutes, and is determined by factors such as the type of polymer, the temperature of the rotating disk, the diameter of the rotating disk, the target fiber diameter, and the stability of operation. In order for the molten filament to be extruded from the rotating disk, the rotating disk needs to be heated. Although the heating means was not shown in the drawing, a heat-resistant electric wire was passed through the center of the pipe-shaped disk rotating shaft, and electricity was supplied by a slip ring to heat the heater fixed to the rotating disk. The temperature can be adjusted by attaching. As another method, there is a method of heating the rotating disk from the outside by radiant heat with a fixed heater. An open-to-atmosphere rotating disk is
Although it is difficult to spin a filament having a small fiber diameter, it has a simple structure, is simple and has high productivity, and thus is suitable for producing the spirally integrated web of the present invention.

[0007] In the method of manufacturing a spirally integrated nonwoven fabric according to the present invention, the centrifugally spun filament is received by air blown downward along a collecting ring, and the draft ratio is further increased to produce a filament having a finer fiber diameter. It was made possible. The air used for the collection ring here may be hot air, and the air blown downward along the collection ring may be a method such as a circular air curtain. Next, the situation in which the centrifugally spun thermoplastic polymer filament is drafted will be described. In the first method, a circular air nozzle is provided on the rotating disk alone and above the collecting ring, and air blows downward along the inner wall of the collecting ring. This is a manufacturing method combining two drafts that are spirally hung (the method of FIG. 1). The second method is a method in which a pan-shaped guide plate is provided in the lower part of the rotating disk in the shape of a pot lid, and a method in which air is prevented from leaking by a collecting ring having a lid on the upper part of the circular nozzle. This is a manufacturing method in which a draft formed in the form of a nozzle becomes a nozzle and the wind speed increases, and a draft that is spirally wound and a draft that is hooked by centrifugal spinning are combined (method of FIG. 2). In the third method, there is air blown downward along the rotating disk alone and the inner wall of the collecting ring, and further, in the vicinity of the filament receiving surface, the nozzle is tangentially directed in the direction opposite to the rotating direction of the rotating disk. There is a manufacturing method that combines draft with centrifugal spinning and draft that is spirally wound with a collection ring by drafting with blowing air (method of FIG. 3).

According to the present invention, hot air blown from above and below the spinning hole and air blown downward along the collecting ring increase draft ratio, improve productivity, and spin filaments having a smaller fiber diameter. It is characterized by doing.
In centrifugal spinning, it has also been proposed to inject such hot air from the vicinity of a rotating disk (Japanese Patent Publication No. Sho 41).
-19606). In that case, it is merely used as a means of blowing away with hot air to produce short fibers. The present invention can also use hot air generated for spinning substantially continuous filaments and spinning the filaments having the draft ratio increased by the above-described apparatus. The temperature of the hot air used for drafting the above-mentioned centrifugally spun filament is preferably at least 50 ° C. which is the set temperature of the rotating disk. As the hot air used for the collecting ring, a separate hot air generator is used, but the hot air of the dish-shaped nozzles above and below the rotating disk can be used in combination with a heater for the rotating disk for melt spinning. As a standard of the draft magnification here, taking the case of the polyethylene terephthalate resin used in the test as an example, the spinning hole inner diameter (φ1 m
When m) was divided by the diameter (average φ0.07 mm) of the filaments that were produced by centrifugal spinning, the average was 14 times, and the square of this value was equivalent to the apparent draft magnification.
The method of raising the draft magnification by hot air from the vicinity of the spinning hole is specifically described as follows. In the method in which a dish-shaped nozzle is mounted above and below the spinning hole of the rotating disk, and in the method in which a circular nozzle with a lid is provided above the collection ring and air is blown downward along the inner wall of the collection ring, the dish is prepared by centrifugal spinning. This is a manufacturing method in which a draft, which is accompanied by a hot air accompanying flow blown from a nozzle, and a draft which is spirally wound along with air blown downward are combined (method of FIG. 4). Still another method uses a method in which a pan lid-shaped guide plate with a lid made of a perforated plate is provided horizontally below the rotating disk in the method shown in FIG. 4, and the draft generated by centrifugal spinning is accompanied by hot air blown from a dish-shaped nozzle. This is a manufacturing method in which two drafts are combined, a draft that is added with the flow and a hot air that is blown from the perforated plate guide plate, and a spiral that is drafted along with the air that is blown downward.

The spinning distance of the present invention refers to the distance from the spinning hole of the rotating disk to the collecting ring. In the case of spinning only by centrifugal force, if the spinning distance is too large, the filament reaches the collecting ring wall. And is not formed in a spirally-stacked web. However, in the present invention, there is also a method in which hot air is ejected from above and below the vicinity of the spinning hole of the rotating disk, so that the spinning distance can be increased. Conventionally, the spinning distance was about 100 mm, but the spinning distance was 150 mm or more, preferably 200 mm.
mm or more, more preferably 250 mm or more. As the spinning distance increases, the circumference of the collection ring increases, the draft ratio can be increased, the fiber diameter can be reduced, and productivity can be improved. On the other hand, the width of the weft-parallel web may be too large. However, it can also be dealt with by folding the spiral web in the width direction after stretching it horizontally or by slitting it in the vertical direction.

The filament spun in this manner is transferred to a belt running horizontally below the rotating disk to be processed into a spirally accumulated web of centrifugally spun filaments formed in a belt shape. The adjustment of the basis weight of the spiral integrated web can be changed by the belt speed, but also by the supply amount of the molten resin and the rotation of the disk.

If the helically integrated web is embossed and formed into a sheet when it is led to the next horizontal stretching, the filaments will not be separated, the dimensional stability will be improved, and the width will be smaller than the diameter of the collecting ring. Since they are the same and narrow, handling is improved. If embossing is given a pattern such as a dot pattern, a line, or a mesh line, the spiral structure collapses when it is guided to the horizontal stretching process and stretched in the width direction, and a long elliptical spiral accumulation on the horizontal As a web, the direction in which the filaments are arranged is deformed substantially in the horizontal direction, and the web becomes an undrawn weft-parallel web, so that the next horizontal drawing can be easily performed. Such deformation in the horizontal direction is called stretching. The temperature at which the spiral integrated web is embossed into a sheet is a temperature that does not hinder the stretching in the subsequent step. For example, in the case of polyethylene terephthalate resin, a temperature at which so-called crystallization does not proceed so much from 50 ° C. to 70 ° C. Is preferred. In addition, the ears at both ends are embossed in a vertical band shape so that they hardly expand even if tension is applied in the flow direction in a later lamination process of processing into a later orthogonal laminated nonwoven fabric (Japanese Patent Publication No. 57-60462). Preferably.

If the helical web is stretched in the width direction and becomes too wide, the horizontal stretching ratio also reaches 5 to 10 times. Therefore, it is necessary to prepare an unnecessarily large horizontal stretching apparatus. In addition, the width of the product becomes too wide, and the process of laminating the crosswise laminated nonwoven fabric requires a wide vertical parallel web, which is uneconomical. In some cases, it may be necessary to fold the sheet in the width direction or slit it in the vertical direction and overlap it in another step to match the product having the desired width. In any case, the method of producing the spirally-laid web is a highly productive method. On the other hand, as for the diameter of the rotating disk, we want to use a small-diameter rotating disk for the reason that the above product width is too wide.
In order to obtain the necessary centrifugal force, it is necessary to increase the rotation speed of the disk. Spinning tends to be unstable due to the turbulence generated during the rotation of the disk and the cooling of the rotating disk by the surrounding air. Sex is impaired. On the other hand, in the present invention, the diameter of the rotating disk can be increased, and a large centrifugal force can be obtained even when the number of rotations is small, and the number of spinning holes can be increased, thereby increasing productivity. Therefore, from the viewpoint of improving spinning stability and productivity, the rotating disk diameter is set at 20 mm.
0 mm or more, preferably 280 mm or more, preferably 3
50 mm or more is used.

In the present invention, the term "horizontal stretching" or simply "stretching" refers to stretching an unstretched weft-parallel web in the weft direction so as to accompany molecular orientation, and is usually performed under heating. Further, the stretching and the stretching of the present invention can be performed in the same step. For example, stretching and stretching can be performed simultaneously by a horizontal stretching apparatus described below. In this case, the apparent horizontal stretch ratio includes the horizontal stretch ratio, and thus is larger than the actual horizontal stretch ratio. In this case, the horizontal stretching process in the horizontal stretching apparatus is performed at about room temperature or near the softening temperature of the resin used. The term "horizontal stretching" used here does not involve molecular orientation, and the spiral structure of the filament collapses to form a long elliptical spiral laminated web in the horizontal direction. Refers to the parallel web. However, the extension in the present invention refers to a range not accompanied by molecular orientation, but is included in the range of extension even if molecular orientation occurs when some entangled filaments are unraveled. Therefore, in this case, it is desirable to use a two-stage horizontal stretching apparatus and divide the stretching process into the horizontal stretching process. In the horizontal stretching, a means for gripping both ears of the weft-parallel web and stretching in the horizontal direction is generally used, and a tenter method used for a biaxially stretched film can also be used. No.-30368, JP-B 63-
No. 3068) is particularly effective. Stretching means combining groove rolls from above and below (Japanese Patent Publication No. 59-3230)
No. 7) can also be used. The weft-parallel web of the present invention is characterized in that the strength in the horizontal direction is strong. In the present invention, the strength in the transverse direction is 33 g / tex or more, preferably 49 g / tex.
As mentioned above, more preferably, it has a strength of 66 g / tex or more. According to the present invention, a nonwoven fabric having high strength in the horizontal direction can be achieved because of sufficient stretching and good arrangement of filaments in the horizontal direction.

The present invention is characterized in that a filament having a small fiber diameter can be spun even by a centrifugal spinning method. In the present invention, the spinning can be stabilized, the draft ratio can be increased, and the filament having a finer fiber diameter can be realized by increasing the draw ratio. According to the present invention, the fiber diameter of the weft filament is 30 microns or less, preferably 20 microns or less, more preferably 15 microns or less.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, molten resin 1 extruded from an extruder and a gear pump (not shown) is supplied to a rotating rotating disk 4 through a resin conduit 2. Heater 3
The melt-spun filaments 6 are scattered from the spinning holes 5 of the rotating disk 4 heated by the heating method (omission method is omitted). Hot air is blown from a pipe 8 into a collecting ring wall 7 provided at a distance from the rotating disk 4, and blows downward along the collecting ring wall 7 from a circular nozzle 9.
At 0, the melt-spun filament 6 is received. Further, the filament 11 is drafted spirally downward and received on a belt 12 which runs horizontally below the rotating disk. A spiral laminated web 13 of filaments in which the spiral shape is slightly shifted in the flow direction and formed in a belt shape is manufactured. It should be noted that when the spiral filaments that have fallen on the horizontally traveling belt 12 are sucked in the negative pressure chamber 14 so as not to be disturbed by the hot air blowing downward, a regular spiral laminated web 13 is formed.

FIG. 2 shows that a molten resin 1 is supplied to a rotating rotating disk 4 through a resin conduit 2. The melt-spun filament 6 scatters from the spinning hole 5 of the rotating disk 4 heated by the heater 3. Hot air is blown from a pipe 8 into a collecting ring wall 7 with a lid 15 at an upper portion provided at a distance from the rotating disk 4, and blows downward along the collecting ring wall 7 from a circular nozzle 9. The filament 6 melt-spun by the hot air layer 10 is received.
Further, a horizontal lid plate 16 having a pot lid shape is provided below the rotating disk.
And the melt-spun filament 11 is drafted thinly and spirally downward from the gap formed by the two arrangements of the collecting ring wall 7. When the helical filament that has fallen on the belt 12 running horizontally below the rotating disk is sucked in the negative pressure chamber 14 so as not to be disturbed by the hot air blowing downward, a regular helical laminated web 13 is formed. .

FIG. 3 shows that a molten resin 1 is supplied to a rotating rotating disk 4 through a resin conduit 2. The melt-spun filament 6 scatters from the spinning hole 5 of the rotating disk 4 heated by the heater 3. A collecting ring wall 7 with a lid 15 on the upper part provided at a distance from the rotating disc 4
A hot air is blown from a pipe 8, and the filament 6 melted and spun by a circular hot air layer 10 blown downward along a collecting ring wall 7 from a circular nozzle 9 is received. On the receiving surface of the filament 6, a nozzle 17 that blows in a direction tangential to the collection ring and opposite to the rotation direction of the rotating disk is provided on the outer wall of the collection ring. Draft is applied by blowing hot air from the nozzle 17, and the filament 11 is downwardly drafted in a thin spiral. When the helical filament that has fallen on the belt 12 running horizontally below the rotating disk is sucked in the negative pressure chamber 14 so as not to be disturbed by the hot air blowing downward, a regular helical laminated web 13 is formed. .

FIG. 4 shows that a molten resin 1 is supplied to a rotating rotating disk 4 through a resin conduit 2. The melt-spun filament 6 scatters from the spinning hole 5 of the rotating disk 4 heated by the heater 3. Rotary joint (not shown) in the same manner as in FIG. 5 shown below
Through the holes, the hot air 19a is passed through the rotating shaft 20 of the double tube of the rotating disk, and the filament 6 is drafted while being scattered by the accompanying hot air 19b blowing from the dish-shaped nozzles 18a and 18b mounted above and below the rotating disk. Hot air is blown from a pipe 8 into a collecting ring wall 7 with a lid 15 at an upper portion provided at a distance from the rotating disk 4, and blows downward along the collecting ring wall 7 from a circular nozzle 9. At 10, the melt-spun filament 6 is received. Further, the filament 11 is drafted spirally downward. When the helical filament that has fallen on the belt 12 running horizontally below the rotating disk is sucked in the negative pressure chamber 14 so as not to be disturbed by the downward blowing air, a regular helical laminated web 13 is formed. .

FIG. 5 shows that the molten resin 1 is supplied to the rotating rotating disk 4 through the resin conduit 2 as in FIG.
The melt-spun filament 6 scatters from the spinning hole 5 of the rotating disk 4 heated by the heater 3. Hot air 19a is sent from the outside of the rotary shaft 20 of the double tube of the rotary disk through the rotary joint 22. The draft 6 is drawn while the filament 6 is scattered by the accompanying hot air 19b blown from the dish-shaped nozzles 18a and 18b mounted above and below the rotating disk. On the other hand, the rotating shaft 20 of the rotating disk
The hot air 21a for floating the filament is sent from the central part of. A horizontal guide plate 16 with a lid made of a perforated plate is provided at the lower part of the rotating disk, and hot air 21b for floating the filament is blown from a number of holes to melt-spun the filament 6.
Floating. A circular hot air layer that blows vertically downward along the collection ring wall 7 from a gap formed by two arrangements of a horizontal guide plate 16 with a cover made of a perforated plate and a collection ring wall 7 with a cover 15 on the top. The filament 11 received and melt-spun at 23 is thinly spirally drafted downward. Belt 12 running horizontally below the rotating disk
When the helical filament that has fallen in the vacuum is sucked in the negative pressure chamber 14 so as not to be disturbed by the hot air blowing downward, a regular spiral laminated web 13 is formed.

FIG. 6 shows an integrated line from the extruder to the transverse stretching. The resin melted by the extruder 24 is sent to a gear pump 26 through a conduit 25. A fixed amount is supplied from a slip ring 28 to a centrifugal spinning disk 29 heated and heated by a resin supply nozzle 27 and rotated by a motor 30 to perform centrifugal spinning. In the centrifugal spinning method, the spiral web 32 is received by the collection ring 31 and formed by the method shown in FIGS. 1 to 5 described above. The spiral laminated web is formed into a sheet by the provisional pressure roll 33 at about 65 ° C., and is further nipped between the hot roll 34 and the ear embossing roll 35 at about 67 ° C. to form a film-like band 40 with only the ear end in the flow direction Dimensional stability. Pinch roll 36, dancer roll 3
7. Make it easy to catch the next horizontal stretching device 39 through the turn roll 38. Although not described here, the transversely stretched weft-parallel nonwoven fabric is sent to the next weft laminating step to be processed into a weft orthogonal nonwoven fabric. FIG. 6a shows a side view and FIG.
Shows a plan view.

[0021]

EXAMPLE 1 A spinning apparatus having a pot-shaped horizontal guide plate attached to the lower part of a rotating disk shown in FIG. 2 has a diameter of 200 m.
m, having 60 spinning holes with a diameter of 1.5 mm. The operating conditions were heated to 330 ° C. and maintained at 2200 rpm.
A polyethylene terephthalate resin (IV value: 0.52) extruded at 290 ° C. through an extruder or a gear pump is supplied at a rate of 625 g / min to a centrifugal spinning disk rotating at a speed of 625 g / min. The filament is injected from the spinning hole and melt-spun, and reaches a 300 mm diameter collecting ring with a circular nozzle with a lid provided at a distance from the rotating disk, and vertically downward along the collecting ring. To 35
Receive at 0 ° C, hot blast blowing at 20 m3 / min. Further, the gap formed between the horizontal guide plate in the shape of a pot lid and the collecting ring is 8 mm, and the melt-spun filament passing through this gap is further drafted spirally downward. On a belt running horizontally at 15m / min,
A spiral web of centrifugally spun filaments was formed. The filament diameter emerging from the centrifugal spinning disk was 70 microns on average, while the diameter of the filament that was drafted twice helically downward with hot air was 50 microns on average, and the average basis weight was 137 g / m ^2. Was formed into a spiral laminated web. This spiral laminated web was preliminarily pressure-bonded at 65 ° C. in a dot type emboss pattern as shown in FIG. 7A and subjected to a horizontal stretching process shown in FIG. The film was stretched 8 times at 90 ° C., including the horizontal stretching (1.57 times), whereby a weft-parallel web having an average basis weight of 27 g / m ² and an average filament diameter of 22 microns could be processed.
The horizontal strength of the processed product is 25kg / 5c on average.
The m width and elongation were 9% on average. Example 2 The specification of a rotating disk having a dish-shaped nozzle that blows hot air above and below the rotating disk shown in FIG.
It has 60 spinning holes with a diameter of 1.5 mm. The operating condition is maintained at 300 ° C. while rotating at 2200 rpm, and hot air at 330 ° C. and 20 cubic meters / minute is discharged from the dish-shaped nozzle. A polypropylene resin (MFR: 500) extruded at 280 ° C. through an extruder or a gear pump is supplied to the rotating disk at a rate of 430 g / min.
The filament is melted and spun from a spinning hole together with hot air. A φ300 mm collection ring with a circular nozzle with a lid at the top provided at a distance from the rotating disk is reached and is directed vertically downward along the collection ring wall.
Received at 0 ° C, hot air curtain layer blowing at 20 m3 / min. The melt-spun filament was further drafted spirally downward and received on a belt running horizontally at 15 m / min to form a spiral web of centrifugally spun filament. The diameter of the filament emerging from the centrifugal spinning disk was 70 μm on average, but the diameter of the filament drafted 2.5 times by hot air from the dish-shaped nozzle was 44 μm on average, and the diameter was spirally lowered by hot air. The average diameter of the double-drafted filament is 3
1 micron. And the average of the grammage is 95 g / m
^Two helical laminated webs could be formed.
The spiral laminated web was preliminarily pressed at 75 ° C. with a mesh type emboss pattern as shown in FIG. 9A, and subjected to a horizontal stretching step shown in FIG. The film was stretched 12 times at 95 ° C., including the horizontal stretching (1.57 times), and the average basis weight was 12 g /
At m ² , weft-parallel webs with an average filament diameter of 11 microns could be processed. The processed product had an average transverse strength of 18 kg / 5 cm width and an elongation of 27%.

[0022]

As described above, the spiral integrated web of the present invention has a strip-like embossed end on both ends, so that no ear material is required, and the center part is partially crossed by filaments. Since it is temporarily compressed by embossing, even if it is horizontal and stretched and processed into a weft-parallel web, it has sufficient connection in the width direction and also has a connection in the length direction, so it stretches somewhat, but it is thin The most characteristic feature is that it can be handled like a sheet like a spunbond, and there is not much slack. In addition, the spiral laminated web of the present invention can spin a filament having a finer fiber diameter than a melt-spun filament from the conventional centrifugal spinning method by using hot air as accompanying air, and further perform horizontal stretching. It has become thinner, supple and drapable parallel web. The method of manufacturing the spiral laminated web is based on the centrifugal spinning method, and the equipment is simpler and the number of steps is smaller than the conventional nonwoven fabric manufacturing method of the spunbond method or the meltblown method. There is an advantage to say. Also, there is an advantage that a wide product can be obtained only by increasing the diameter of the centrifugal spinning disk or the filament collecting ring. Further, the weft-parallel web of the present invention can be used alone or as a reinforcing material for a horizontal paper or a nonwoven fabric. The orthogonally laminated nonwoven fabric has dimensional stability and high strength, and is used as clothing, wallpaper, printed material, packaging material, cloth adhesive tape base fabric, geotextile, and the like.

[Brief description of the drawings]

FIG. 1 is a side view of a rotating disk, a collecting ring, and a spiral laminated web manufacturing apparatus used in the centrifugal spinning method of the present invention.

FIG. 2 is a side view of a rotary disk, a collecting ring, and a spiral laminated web manufacturing apparatus of a type different from that of FIG. 1;

FIG. 3 is a side view of another manufacturing apparatus.

FIG. 4 is a side view of another manufacturing apparatus.

FIG. 5 is a side view of another manufacturing apparatus.

FIG. 6 is a conceptual side view and a plan view of a spiral laminated web manufacturing apparatus using a centrifugal spinning method of the present invention, and sheeting, embossing, and transverse stretching steps.

FIG. 7 is an embossed shape diagram of a spiral laminated web and a weft-parallel web embossed with a dot type.

FIG. 8 is an embossed shape diagram of a spiral laminated web and a weft-parallel web subjected to embossing of a horizontal line type.

FIG. 9 is a diagram showing a shape of a spiral laminated web and a weft-parallel web embossed with a mesh line type.

[Explanation of symbols]

1: molten resin, 2: resin conduit, 3: rotating disk heater, 4: centrifugal spinning disk, 5: spinning hole, 6: melt spun filament, 7: collecting ring wall, 8: pipe, 9: Circular nozzle, 10: circular hot air layer, 11: filament, 12: belt, 13: spiral laminated web,
14: negative pressure chamber, 15: lid, 16: horizontal guide plate, 17:
Nozzle, 18a: dish-shaped nozzle (upper), 18b: dish-shaped nozzle (lower), 19a: hot air, 19b: accompanying hot air, 20: rotating shaft, 21a: hot air for floating, 21b: hot air (blowing from perforated plate) , 22: rotary joint, 23: circular hot air layer, 24: extruder, 25: conduit, 26: gear pump, 27: resin supply nozzle, 28: slip ring, 29: heated centrifugal spinning disk, 30: motor,
31: collection ring, 32: spiral web, 33: temporary press roll, 34: hot roll, 35: ear emboss roll,
36: pinch roll, 37: dancer roll, 38: turn roll, 39: transverse stretching device, 40: film-like band

Claims (7)

[Claims] 1. A helical stack of centrifugally spun filaments, wherein the centrifugally spun thermoplastic polymer filaments are spirally integrated in the width of the product and the spiral shape is formed with a slight shift in the direction of flow. Non-woven fabric. 2. A weft-parallel filament nonwoven fabric obtained by horizontally stretching the spiral integrated nonwoven fabric of claim 1. 3. A thermoplastic polymer filament is injected from a spinning hole of a rotating disk, a collecting ring is provided outside the rotating disk at a distance from the rotating disk, and air is blown downward along the collecting ring. A method of making a spirally integrated nonwoven fabric of centrifugally spun filaments, which receives the filaments and directs the filaments downward with air and into a belt running horizontally below a rotating disk. 4. The method according to claim 3, wherein a guide plate is provided horizontally below the rotating disk, and downward air is passed through a gap between the collection ring and the guide plate.
A method for producing a spirally integrated nonwoven fabric of centrifugally spun filaments. 5. A nozzle according to claim 3, wherein a nozzle for blowing air in a tangential direction of the collecting ring is provided on a receiving surface of the filament for air blowing downward along the collecting ring, and the air blowing from the nozzle is a rotating disk. A method for producing a spirally integrated nonwoven fabric of centrifugally spun filaments by blowing in a direction opposite to the rotational direction of the filament. 6. The method according to claim 3, wherein hot air is blown from above and below the spinning hole of the rotating disk to produce a spirally integrated nonwoven fabric of centrifugally spun filaments. 7. The method for producing a weft-parallel filament nonwoven fabric according to claim 3, wherein the spirally accumulated nonwoven fabric of centrifugally spun filaments is embossed and then horizontally stretched.