JP2543901B2 - Air-nozzle for non-woven fabric manufacturing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air nozzle for forming a nonwoven fabric by placing a filament spun from a spinning nozzle on an air flow to disperse and superimpose it on a dispersion plate.

[Conventional technology]

Conventionally, as this type of air nozzle, Japanese Patent Publication No. 48-28
The one described in Japanese Patent No. 386 is known. this is,
As shown in FIG. 3, a first nozzle 1 for receiving filaments spun from a spinning nozzle (not shown);
The nozzle 1 is provided in the upper part, and the second nozzle 2 is configured to send the filament sent from the first nozzle 1 to the air flow and send it to a dispersion plate (not shown).

The first nozzle 1 has an inlet 5 for receiving the filament from the spinning nozzle, and further has a conical conduit 6 that is reduced in diameter toward the tip following the inlet 5, and further the tip of the conical conduit 6 is provided. A first nozzle pipe 8 is formed so as to form a straight pipe line 7 continuing from the end of the conical pipe line 6 with the diameter of the tip end of the conical pipe line 6.

The first nozzle tube 8 is inserted into the second nozzle 2, and an air passage 10 is formed in the second nozzle 2 so as to surround the first nozzle tube 8. This airway 10 is the first
Air is supplied to the tip outlet side along the nozzle tube 8 and blows air in the direction toward the outlet. An air flow control body 11 that narrows the middle of the air passage 10 in order to increase the flow velocity of the air. Are provided in the second nozzle 2. This air flow control body 11 has a conical diameter reducing portion 12 that gradually reduces the diameter of the air passage 10 into a conical shape, and a conical shape that gradually increases in diameter following the constricted portion at the tip of the conical diameter reducing portion 12. And a widened portion 13.

Then, following this conical widening portion 13, a second nozzle tube 14
The filaments that are projected from the first nozzle tube 8 and are sent out from the first nozzle tube 8 ride on the air flow that has become ultra-high speed by passing through the constricted part of the air passage 10, and the filaments inside the second nozzle tube 14 become the dispersion plate. Sent out to.

[Problems to be solved by the invention]

By the way, it is usual that pigments such as titanium white (TiO ₂ ) are mixed in the filaments spun by the spinning nozzle, and the conventional air nozzle has a SU
It is made of stainless steel such as S304, but when the filament containing such pigment is taken out by the stainless air nozzle as described above and sent out, the pigment acts as an abrasive and the inside of the air nozzle The wall will be scraped.

In particular, in the first nozzle 1, the portion that transitions from the conical pipe line 6 to the straight pipe line 7 is a step portion, so the degree of abrasion of this step portion is strong, and this step portion is scratched and the filament When a resistance is applied to the flow, the dispersion of the filaments is deflected, the yarn overlaps with a part of the non-woven fabric that is dispersed and collected on the dispersion plate, and the yarn solidifies, and defects such as band-like thinness unevenness in the web flow direction occur. .

Then, the scratches are formed during a single operation, and when the scratches are formed, it is necessary to replace with a new first nozzle 1, and a loss time is generated during replacement, which impairs the productivity of the nonwoven fabric.

The present invention is for solving such a problem,
It is a technical subject to provide an air nozzle that does not produce a defective product due to scratches on the inner wall surface when a non-woven fabric containing a pigment such as titanium white is produced.

[Means for solving problems]

The present invention has the following technical means in order to solve the above technical problems.

The air nozzle of the present invention, while taking a resin filament containing a pigment spun from the spinning nozzle,
An air nozzle for forming a non-woven fabric by carrying it on an air flow and forming it on a dispersion plate, the first nozzle 1 having an inlet 5 for receiving a filament from a spinning nozzle, and an outlet around this first nozzle 1. An air passage 10 for guiding the air and then ejecting the air in the direction in which the outlet of the tip of the first nozzle 1 faces
And has a first nozzle 1 by the air flow from the air passage 10.
The second nozzle 2 is provided for sending out the filament drawn from the inside toward the dispersion plate.

The first nozzle 1 has a tip end portion which is the second nozzle 2
A cylindrical main body 3 that is inserted into the second nozzle 2 and is detachably attached to the second nozzle 2, and a base portion that is detachably attached to the distal end of the cylindrical main body 3 so that the base portion is retracted into the cylindrical main body 3 The tip nozzle portion 4 is provided so as to project from the cylindrical body 3 and be positioned in the air passage 10.

The inside of the first nozzle 1 is a conical conduit 6 whose diameter gradually decreases from the inlet 5 to the middle thereof. From the tip of the conical conduit 6 to the outlet side of the tip of the first nozzle 1 It is a straight conduit 7 that continues with the diameter of the tip of the conduit 6.

An upstream portion of the conical conduit 6 is formed in the cylindrical body 3, and a downstream portion of the conical conduit 6 and a straight conduit 7 are formed in the tip nozzle portion 4, and at least the cone is formed in the tip nozzle portion 4. The portion of transition from the conduit 6 to the straight conduit 7 was made of ceramic.

[Action]

The spinning is carried out with a molten resin, which is preferably extruded from a number of spinning nozzles arranged in one or a number of rows. The spun filaments are in linear rows with respect to each other and are at a predetermined distance from each other. The resin used may be crystalline or amorphous, and may be low density polyethylene, high density polyethylene, polypropylene, poly 1-pentene, poly 4-methyl-1-pentene or ethylene, propylene, 1-ptene, 4-methyl-. 1-
Random or block copolymers of α-olefins such as pentene, ethylene, acrylic acid copolymer, ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / vinyl chloride copolymer, etc. Ethylene / vinyl compound copolymer, polystyrene, acrylonitrile / styrene copolymer, ABS,
Styrene resin such as methyl methacrylate / styrene copolymer, α-methylstyrene / styrene copolymer, polyvinyl chloride, polyvinylidene chloride, vinyl chloride / vinylidene chloride copolymer, polymethyl acrylate, polymethyl methacrylate Polyvinyl compounds such as nylon, polyamides such as nylon 6, nylon 6-6, nylon 6-10, nylon 11 and nylon 12, thermoplastic polyesters such as polyethylene terephthalate and polybutylene terephthalate, polycarbonates, polyphenylene oxides and the like, or mixtures thereof. Any resin may be used.

Pigments include titanium white, zinc white, lithobon, lead white, cadmium yellow, yellow lead, titanium yellow, gin chloromate, ocher, chrome vermilion, red mouth pigment, amber, yellow iron oxide, red iron oxide, cadmium red, lead tin. , Indigo blue, ultramarine blue, cobalt blue, chrome green oxide, mineral violet, carbon black, iron black and other inorganic pigments, benzine yellow, Hansa yellow, resole red, alizarin lake, pigment scarlet 3B, brilliant carmine 6B, permanent red F
-5R, Permanent Red 4R, Rhodamine Lake B, Rhodamine Lake Y, Lake Red C, Para Red, Peacock Blue Lake, Phthalocyanine Blue, Aniline Black, Permanent Yellow HR, PV Violet BL,
An appropriate amount of an organic pigment such as quinacridone, perinone, anthraquinone, chromophtal yellow 6G, chromophtal yellow 3G, and chromophtal yellow GR is blended.

It is customary to install a plurality of air nozzles, which take up the bundle of spun filaments and deliver it to the dispersion plate, in order to form a nonwoven fabric having a practical width. In general, it is preferable to arrange a number of air nozzles in a sequential position so that the desired overlap of the trajectories of the filaments delivered by the air nozzles over the entire width of the delivery belt forming the dispersion plate.

The spun filaments are stretched and stretched by being pulled by an air flow, dispersed and delivered, so that they are intricately deposited on the dispersion plate.

Further, in the first nozzle 1, since at least the portion that transitions from the conical pipe line 6 to the straight pipe line 7 is made of ceramic, the abrasion resistance of that portion is improved, and therefore, a pigment such as titanium white is included. Even if the filament is taken out and sent, the inner wall surface of the nozzle is not scratched.

Moreover, the first nozzle 1 is detachably attached to the second nozzle 2, and the first nozzle is composed of the tubular body 3 and the tip nozzle portion 4 which are attachable to and detachable from each other, and the conical conduit 6 is provided in the tip nozzle portion 4. By providing a portion that transitions from the straight conduit 7 to the straight conduit 7, and by forming this portion from ceramic, if the portion that migrates from the conical conduit 6 to the straight conduit 7 is damaged due to long-term use, After removing the first nozzle 1 from the second nozzle 2, the tip nozzle portion 4 is removed from the tubular body 3 of the first nozzle 1 and the tip nozzle portion 4 is replaced, whereby the performance of the air nozzle can be restored. .

Here, as the material of the ceramic, for example, alumina (Al ₂ O ₃ ), boron oxide (B ₂ O), silicon dioxide (Si
O ₂ ), tin dioxide (SnO ₂ ), zinc oxide (ZnO), zirconium dioxide (ZrO ₂ ) and other oxides, boron nitride (B
N), aluminum nitride (AlN), silicon nitride (Si
₃ N ₄ ), nitrides such as sialon [(Si, Al) ₆ (O, N) ₈ ], boron carbide single crystal (B ₄ C), silicon carbide (SiC),
Examples of the main component include a carbide such as titanium carbide (TiC), or a mixture thereof.

Of these, particularly preferred for the present invention are:
For example, one using alumina, that is, alumina (Al
₂ O ₃ ) and titanium oxide (Ti ₂ O ₃ ) at a ratio of 100: 0.15, and a small amount of chromium oxide (Cr ₂ O ₃ ) and iron oxide (Fe ₂ O ₃ ) added, and rubber press method etc. The necessary part of the first nozzle 1 is molded and sintered as described above.

Although the material containing alumina as a main component is not limited to this example, it is suitable for the present invention because it has excellent wear resistance, heat resistance, and chemical resistance.

In addition, since boron oxide (B ₂ O) has a diamond-like crystal structure, it exhibits superhardness and is not easily scratched.

Zirconium dioxide (ZrO ₂ ) is suitable for the present invention because it has excellent corrosion resistance and abrasion resistance. Zirconium dioxide (ZrO ₂ ) can also be used for forming a film on a metal surface. In the present invention, the inner wall surface of the portion extending from the conical conduit 6 to the straight conduit 7 is covered with a zirconium dioxide coating layer. May be covered.

Among boron nitride (BN), particularly cubic boron nitride (cBN) has a hardness comparable to that of diamond and is excellent in wear resistance, and therefore can be suitably used in the present invention.

In addition, silicon nitride (Si ₃ N ₄ ) is also suitable for use because it has excellent wear resistance, and 3 to 10% of MgO and Y ₂ O is contained in silicon nitride.
_3. Rare earth metal oxides and the like can be used as sintering aids and sintered under pressurized nitrogen.

Sialon [(Si, Al) ₆ (O, N) ₈ ] and silicon carbide (SiC) are also suitable for the present invention because of their high hardness.

In the present invention, the tip nozzle portion 4 of the first nozzle 1
In order to prevent the inner wall surface from being scratched, at least the portion that transitions from the conical conduit 6 to the straight conduit 7 is formed in order to prevent the inner wall surface from being scratched. The meaning of forming the portion transitioning to No. 4 is made of ceramic means that the entire tip nozzle portion 4 is made of ceramic, or that a ceramic coating layer is provided on the inner wall surface of the portion from the conical pipe line 6 to the straight pipe line 7. It also includes the case of setting.

It should be noted that, if necessary, a conical diameter-increasing conduit that gradually increases in diameter after the straight conduit 7 may be provided at the tip of the first nozzle 1.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the air nozzle of this embodiment includes a first nozzle 1 for receiving a filament spun from a spinning nozzle (not shown), and an interior of the first nozzle 1 at the upper part thereof. The second nozzle 2 sends the filament to be delivered onto the air flow and delivers it onto a dispersion plate (not shown). The first nozzle 1 is detachably screwed and fixed to the second nozzle 2.

The first nozzle 1 has a tubular body 3 and a tip nozzle portion 4, and the tip nozzle portion 4 is provided in the tip opening portion of the tubular body 3.
Is to be screwed on. The cylindrical main body 3 has an inlet 5 at the base end for receiving the filament from the spinning nozzle, and a conical conduit 6 which is reduced in diameter toward the tip following the inlet 5.
Are formed so as to straddle the inside of the tubular body 3 and the inside of the tip nozzle portion 4. Further, a first nozzle pipe 8 forming a straight pipe line 7 continuing from the tip of the conical pipe line 6 with the diameter of the tip of the conical pipe line 6 protruding from the tip nozzle portion 4.

Then, in the tip nozzle portion 4, a portion that transitions from the conical pipe line 6 to the straight pipe line 7 is formed of a ceramic sintered body as a nozzle element 9. This nozzle element 9 is fixed to the tip nozzle part 4, and by attaching and detaching the tip nozzle part 4 to and from the first nozzle 1, the nozzle element 9 and the tip nozzle part 4 can be exchanged together. It has become. This ceramic is mainly composed of alumina.
It comprises 0.1 part by weight of magnesia and 0.1 part by weight of magnesia.

In addition, the first nozzle tube 8 is inserted into the second nozzle 2, and the second nozzle 2 is connected to the first nozzle pipe 8 from the side air inlet through the first nozzle pipe 8.
An air passage 10 is formed so as to surround the nozzle tube 8. The air passage 10 supplies air to the tip outlet side along the first nozzle pipe 8 and blows air in the direction toward the outlet, and in order to increase the flow velocity of the air,
An air flow control body 11 is provided in the second nozzle 2 so as to surround the nozzle tube 8 and constrict the middle of the air passage 10. This air flow control body 11 has a conical diameter reducing portion 12 that gradually reduces the diameter of the air passage 10 into a conical shape, and a conical shape that gradually increases in diameter following the constricted portion at the tip of the conical diameter reducing portion 12. And a widened portion 13.

Then, following this conical widening portion 13, a second nozzle tube 14
Is provided.

In this air nozzle, the air introduced into the air passage 10 passes through the constricted portion of the air flow control body 11 and becomes ultra-high speed to flow from the periphery of the tip of the first nozzle pipe 8 into the second nozzle pipe 14. At that time, the air in the first nozzle 1 is sucked to reduce the pressure in the first nozzle 1 to a negative pressure. Therefore, the filament introduced from the spinning nozzle to the inlet 5 of the first nozzle 1 is sucked into the first nozzle 1 and is sent along the air flow through the second nozzle pipe 14 toward the dispersion plate, where it is suspended. It is stretched, stretched and dispersed and deposited on a dispersion plate to form a nonwoven fabric.

Next, when a non-woven fabric was produced using this air nozzle, it was examined whether or not a defect occurred in the obtained non-woven fabric.

The raw material of the non-woven fabric was polypropylene, and 0.085 wt% of this material was blended with titanium white (TiO ₂ ) and spun, and the obtained filament was dispersed and deposited on a dispersion plate by an air nozzle to obtain a non-woven fabric. By using this air nozzle, the filament is dispersed into an elliptical shape with a vertical width of 110 mm and a horizontal width of 500 to 520 mm. Then, seven air nozzles were arranged side by side, and the dispersion plate was moved in the arrangement direction to obtain a nonwoven fabric having a predetermined thickness.

Separately from this, a non-woven fabric was similarly produced from the same raw material using an air nozzle in which the entire tip nozzle portion 4 was formed of steel, and the degree of failure was examined. The above results are shown in Table 1 below.

One roll = width 0.6m, length 500m.

Thread overlap: A part where filaments overlap each other and become thicker, with a diameter of 5 cm or less.

Thread clump; a thickened part where filaments overlap each other and is a large one with a diameter of 5 cm or more.

Thin-walled unevenness; a thin-walled part generated with a length of several meters.

As a result, it can be seen that the air nozzle of the example using ceramic has a lower degree of occurrence of defects.

Further, when the nonwoven fabric was manufactured for one month under the conditions carried out in the examples, no sign of scratches on the ceramic part was observed, and the nonwoven fabric with extremely few defects was continuously obtained.

〔The invention's effect〕

According to the present invention, since at least the portion that transitions from the conical conduit to the straight conduit is formed of ceramic, the inner wall surface of the nozzle at this portion is not scratched, and thus the filament flow is obstructed and the dispersion of the filament is prevented. It is possible to manufacture a non-woven fabric which is uniformly dispersed without unevenness and has no unevenness.

The first nozzle has a tubular body detachably connected to the second nozzle, and a tip nozzle portion detachably attached to the tubular body, and the tip nozzle portion is directly connected to the conical conduit. By providing a part that transitions to the duct and forming at least this part with ceramic, if the inner wall surface of the part that transitions from the conical duct to the straight duct is damaged, replace the entire air nozzle. It is possible to restore the performance of the air nozzle by replacing only the tip nozzle portion without being required, which is extremely economical. Moreover,
This replacement work is extremely easy and quick, so that productivity can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view showing the tip nozzle portion of the nozzle, and FIG. 3 is a cross-sectional view showing a conventional air nozzle. 1 ... First nozzle, 2 ... Second nozzle, 5 ... Inlet, 6
...... Conical conduit, 7 …… Straight conduit, 9 …… Nozzle element, 10 …… Air conduit.

Continuation of the front page (56) Reference JP-A-50-70628 (JP, A) JP-A-48-93720 (JP, A) JP-A-50-123920 (JP, A) JP-B-48-28386 (JP , B1) Actual public 47-3673 (JP, Y1) Actual public 53-3284 (JP, Y2)

Claims (1)

(57) [Claims] 1. An air nozzle for drawing a resin-made filament containing a spun raw material from a spinning nozzle and sending the filament on an air flow to deliver it onto a dispersion plate to form a nonwoven fabric. A first nozzle 1 having an inlet 5 for receiving a filament, and an air passage 10 for guiding air around the outlet of the first nozzle 1 and thereafter ejecting the air in the direction toward the tip outlet of the first nozzle 1, A second nozzle 2 for delivering a filament drawn from the inside of the first nozzle 1 toward the dispersion plate by the air flow from the air passage 10, and the first nozzle 1 has a tip end portion of the second nozzle 2. A tubular body 3 that is inserted into the nozzle 2 and is detachably attached to the second nozzle 2, and a base portion that is detachably attached to the tip of the tubular body 3 and whose base is immersed in the tubular body 3 Tubular part And a tip nozzle portion 4 projecting from the body 3 and positioned in the air passage 10, and the inside of the first nozzle 1 is a conical conduit 6 in which the diameter gradually decreases from the inlet 5 to the middle. And this conical conduit 6
Is a straight pipe line 7 continuing from the tip of the first nozzle 1 toward the outlet side of the tip of the first nozzle 1 with the diameter of the tip of the conical pipe line 6 being formed. Is
The downstream portion of the conical conduit 6 and the straight conduit 7 are formed in the tip nozzle portion 4, and at least the portion of the tip nozzle portion 4 that transitions from the conical conduit 6 to the straight conduit 7 is made of ceramic. An air nozzle for manufacturing non-woven fabrics.