JPH01207460A - Air nozzle for producing non woven fabric - Google Patents

Abstract

PURPOSE:To obtain the title air nozzle having excellent abrasion resistance to the pigment such as titanium white, by forming at least tip inner circumference part with a ceramic in a discharge tube part of cap jointed to a nozzle member. CONSTITUTION:A cap 22 is jointed to the top tip of tapered hole part 21 of nozzle member 20 and the tip inner circumference part of the discharge tube part 22B is formed with a ceramic so as to enhance abrasion resistance of the tip inner circumference part. The tip of the discharge tube part 22B may be formed into tube shape by the ceramic or ceramic coating layer 25 may be formed only on the inner circumference surface layer of the tip.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an air nozzle for producing a nonwoven fabric by dispersing and superimposing filaments from a spinning nozzle on a dispersion plate, and more specifically, This invention relates to an air nozzle for manufacturing nonwoven fabrics that prevents wear due to high-speed contact.

[Conventional technology]

Conventionally, as this type of air nozzle, there is, for example, a nonwoven fabric web using continuous threads and a method for manufacturing the same, as shown in FIG. 3 and described in Japanese Patent Publication No. 48-28386. The structure of this manufacturing air nozzle is that a nozzle member 1 receives filaments spun from a spinning nozzle (not shown), and the filaments are sent to an air jet from a feed guide tube 2a provided in a housing 2 outside the nozzle member 1. It is then placed on the dispersion plate shown in the lower part of the figure.

That is, in order to easily receive the filament, the nozzle member l is provided with a conical hopper-shaped diameter-reducing hole 1a that gradually reduces in diameter toward the bottom. The discharge pipe portion 1b protrudes. Furthermore, a compressed air chamber 2b and an air throttle section 2C are formed inside the housing 2 so as to surround the discharge pipe section 1b, and the compressed air A introduced into the compressed air chamber 2b is Air jet A with high flow velocity while being rectified by the constriction part 2C 1. Then, the liquid is sprayed along the outer periphery of the discharge pipe portion lb toward the tip exit side.

The discharge pipe section 1 becomes negative pressure due to the action of this air jet A1.
From the tip exit side of b, the suction action promotes the discharge of the filament and stabilizes the flow, and sends it out to the feed guide tube 2.
This structure produces a nonwoven fabric by dispersing and superimposing filaments on a dispersion plate while being guided by a.

[Problem that the invention seeks to solve]

By the way, the filaments spun with the spinning nozzle include
A pigment such as titanium white (TiOt) is usually mixed in, and a filament containing such a pigment is made of stainless steel (for example, SUS 30) as shown in Figure 3.
When the pigment is fed into an air nozzle such as 4) at high speed, the pigment acts as an abrasive due to contact with the filament, causing problems such as abrasion of the inner wall surface of the air nozzle.

Phenomena such as this wear occur particularly in the entire length section from the top tip of the conical diameter-reduced hole 1a of the nozzle member l, through the boundary 1c transitioning to the straight discharge tube 1b, to the tip of the discharge tube 1b. If severe wear occurs here, it will create resistance to the flow of the filament and affect subsequent dispersion. As a result, a portion of the nonwoven fabric dispersed and collected on the dispersion plate is contaminated, resulting in defects such as yarn clumping or band-like thinning unevenness in the flow direction of the web.

In addition, such wear occurs even during a relatively short period of operation, and when replacing the old and new nozzle members 1 with a power change, there is a problem that productivity is reduced due to an increase in the operation stop time due to the replacement.

The object of the present invention has been made in view of such conventional problems, and is to provide an air nozzle for producing nonwoven fabrics that has excellent abrasion resistance against pigments such as titanium white when producing nonwoven fabrics containing pigments such as titanium white. Our goal is to provide the following.

[Means for solving problems]

The present invention has the following configuration to solve this technical problem.

That is, this air nozzle for producing a nonwoven fabric receives filaments spun by a spinning nozzle, and sends the filaments onto a dispersion plate using an air jet to produce a nonwoven fabric.

A nozzle member 20 is coupled to the inside of the main body housing 10 of this air nozzle.

A conical diameter-reduced hole portion 21 into which the filament is introduced is provided.

Further, a cap 22 is coupled around the top of the diameter-reducing hole portion 21 of the nozzle member 20, and the cap 22 is connected to the diameter-reducing hole portion 21 of the nozzle member 20.
1. A base portion 22 having a diameter-reducing hole portion 23a that continues at the same slope as the base portion 22.
A, and a discharge pipe portion 22B that communicates with the diameter-reduced hole portion 23a and extends straightly in the axial direction from the base portion 22A.

Furthermore, a compressed air chamber 11 into which compressed air A is introduced is provided inside the housing 10. Compressed air A in the compressed air chamber 11 is connected to this compressed air chamber 11.
An air throttle pipe 41 is connected thereto that rectifies the air into a high-velocity air jet AI and flows it toward the distal end along the outside of the discharge pipe portion 22B.

That is, the filament is passed through the air jet A, through the discharge guide pipe 40 extending in the axial direction from the air throttle pipe 41
It is configured so that it can be placed on the board and sent out onto the dispersion plate.

In this configuration, at least the inner peripheral portion of the distal end of the discharge tube portion 22B of the mouthpiece 22 is made of ceramic.

[Effect]

Molten resin is extruded from multiple spinning nozzles to spin a large number of filaments. The resin used is
Low density polyethylene, high density polyethylene, and polypropylene, polyester, poly4-methyl-I-pentene or ethylene, propylene, 1-butene, 4-
Polyolefins such as random or block copolymers of α-olefins such as methyl-1-pentene, ethylene/vinyl acetate copolymers such as ethylene/acrylic acid copolymers, ethylene/vinyl alcohol copolymers, ethylene/vinyl alcohol copolymers, etc. Ethylene/vinyl compound copolymers such as vinyl chloride copolymers, polystyrene, acrylonitrile/styrene copolymers, ABS.

Styrenic resins such as methyl methacrylate/styrene copolymer, α-methylstyrene/styrene copolymer, polyvinyl chloride, polyvinylidene chloride, vinyl chloride/vinylidene chloride copolymer, polymethyl acrylate, polymethyl methacrylate Bolivi etc.

Nyl compound, nylon 6, nylon 6-6, nylon 6
-10, nylon 11. Polyamide such as nylon 12,
Any resin such as thermoplastic polyester such as polyethylene terephthalate or polybutylene terephthalate, polycarbonate, polyphenylene oxide, or a mixture thereof may be used.

Molten resin contains titanium white, zinc white, lithopone, lead white, cadmium yellow, yellow lead, titanium yellow, zinc chromate, ocher, chrome vermilion, red pigment, amber, yellow iron oxide, red iron oxide, cadmium red, red lead. ,
Navy blue, ultramarine blue, cobalt blue, chrome oxide green,
Inorganic pigments such as mineral violet, carbon black, iron black, benzidine yellow, Hansa yellow, Lysole red, alizarin lake, pigment scarlet 3
B, Brilliant Carmino 6B, Permanent Trez FF
-5R,7<-Manent Red 4R1 Rhodamine Lake B10-Damin Lake Y Ruki Red C1 Para Red,
Peacock Blue Lake, Phthalocyanine Blue, Aniline Black, Permanent Yellow HR, PV Violet BL, Quinacridone, Perinone, Anthraquinone,
Croceftal Yellow 6G, Cromophthal Yellow-3G
.

An appropriate amount of organic pigment such as Cromophthal Yellow GR is blended.

A plurality of air nozzles are installed to receive the spun filament bundle and send it out to the distribution plate, depending on the width dimension of the nonwoven fabric to be manufactured. A nonwoven fabric of a desired size is manufactured by discharging filaments from each of these air nozzles in an air jet, and intertwiningly depositing them on a dispersion plate while stretching and dispersing the filaments.

In addition, in the nozzle member 20 that contacts the filament, 1, a diameter-reduced hole portion 2 in which high-speed contact with the filament is particularly noticeable;
By connecting the cap 22 to the tip of the top of the discharge tube 22B and forming the inner circumferential portion of the tip of the discharge pipe portion 22B extending from the cap 22 with ceramic, the wear resistance of the inner circumferential portion of the tip is enhanced. Regarding the form of ceramic formation, the distal end of the discharge pipe portion 22B may be formed into a cylindrical shape using ceramic, or the base body of the discharge pipe portion 22B may be formed into a cylindrical shape using another metal material.
Only the inner peripheral surface layer of this tip portion may be coated with ceramic. Further, it is more preferable that the ceramic coating is applied not only to the inner circumferential portion of the distal end of the discharge pipe portion 22B but also to the entire inner circumferential portion of the mouthpiece 22.

Here, examples of the ceramic material used include alumina (Af2tO3), boron oxide (BtO),
Silicon dioxide (Siot), tin dioxide (SnOt),
Zinc oxide (ZnO), zirconium dioxide (ZrO,)
oxides such as boron nitride (BN), aluminum nitride (A12N), silicon II (Si, N, ), nitrides such as sialon ((Si, A12)-(0,N)-), and boron carbide monomers. Crystals (B, C), silicon carbide (Si
C), carbides such as titanium carbide (TiC), etc., or a mixture of these.

Among these, those containing alumina as a main component are suitable for use in the present invention because they have excellent abrasion resistance, heat resistance, chemical resistance, and the like. Examples of alumina components include alumina (AQ, 03) and titanium oxide (Tt).
t03) in a ratio of 100:0.15, add a small amount of chromium oxide (CRTO3) and iron oxide (PE, O,) to it, and form the necessary parts of the cap 22 by a rubber press method or the like. There are some that are sintered.

Furthermore, boron oxide (StO) has the advantage that it has excellent superhardness due to its diamond-like crystal structure and is less prone to scratches and marks.

Zirconium dioxide (ZrL) also has excellent corrosion resistance and wear resistance, and is therefore suitable for use in the present invention. Furthermore, this zirconium dioxide can also be used to form a film on a metal surface, and instead of ceramic molding, the molded area may be coated with a coating layer of zirconium dioxide.

Among boron nitrides (BN), cubic boron nitride (cBN) is particularly suitable for the present invention because it has a hardness comparable to that of diamond and excellent wear resistance.

In addition, silicon nitride (SiJ4) is also suitable because it has excellent wear resistance, and silicon nitride contains 3 to 10% Mg.
O1Y, 03, rare earth metal oxides, etc. are used as sintering aids,
Those sintered under pressurized nitrogen can be used.

In addition, Sialon ((Si, A12)-(0, N)s
) and silicon carbide (SiC) also have high hardness and can be said to be suitable for use in the present invention.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the air nozzle for manufacturing nonwoven fabric according to the present invention will be described below with reference to the drawings.

In FIG. 1, the air nozzle that receives filaments spun from a spinning nozzle (not shown) has a nozzle member 20 screwed onto the upper part of the housing 10 of the main body, and the filament is introduced into this nozzle member 20. ing. The nozzle member 20 is provided with an inverted conical reduced diameter hole 21 to facilitate receiving the filament.

Further, a cap 22 is screwed onto the nozzle member 20 around the nape of the diameter-reduced hole 21, and the cap 22 consists of a base 22A and a discharge pipe portion 22B extending straight from the base 22A in the axial direction. There is. A diameter-reducing hole 23a is formed in the base 22A and extends from the top at the same slope as the diameter-reducing hole 21 on the nozzle member 20 side, and a discharge pipe portion 22B projects in the axial direction in communication with the diameter-reducing hole 23a. ing.

Further, a compressed air chamber 11 is provided inside the housing 10 to surround the discharge pipe section 22B on the side of the nozzle member 10, and compressed air A is introduced from a supply source into this compressed air chamber 11 through an air introduction pipe 3G. It looks like this.

Further, a feed guide tube 40, which is also a member that separates the compressed air chamber 11, is screwed to the lower end of the housing 10, and the filament is sent out onto the dispersion plate at the bottom of the figure through the feed guide tube 40. ing.

Further, a suitable air throttle tube 41 protruding into the compressed air chamber 11 is fitted into the feed guide tube 40, and the discharge pipe portion 22B is inserted into the air throttle tube 41 from above. The air throttle pipe 41 has an enlarged diameter part 41a and a reduced diameter part 4 of the inner circumference.
1b are formed in a row, and a gap is provided between the outer circumferential surface of the discharge pipe section 22B through which the compressed air A can pass. That is, the compressed air A in the compressed air chamber 11 is rectified when passing into the air throttle pipe 41, and is sent as an air jet A1 with increased flow velocity to the tip in the axial direction along the outside of the discharge pipe section 23. It is blown into the guide tube 40. Air jet A.

Due to this action, the vicinity of the outside of the tip of the discharge pipe portion 22B becomes negative pressure, which has the effect of stabilizing the flow of the discharged filament by suctioning it.

That is, the filament discharged from the discharge pipe portion 22B of the mouthpiece 22 is configured to ride on the air jet A1, pass through the discharge guide tube 40, and be sent onto the dispersion plate below.

Here, as shown in FIG. 2, in this embodiment, the base 2
A ceramic coating layer 25 is formed on the inner peripheral surface of the tip end of the second discharge pipe section 22B. The ceramic forming this coating layer 25 has a composition mainly composed of alumina, for example, 100 parts by weight of alumina and 0.1 parts by weight of magnesia.

Next, a nonwoven fabric was manufactured using the air nozzle of this example. The raw material for producing the nonwoven fabric was polypropylene, and this raw material was blended with 0.85 wt % of titanium white (Trot) and spun, and the obtained filaments were dispersed and deposited on a dispersion plate using an air nozzle to obtain a nonwoven fabric. The filaments are dispersed in an elliptical shape with a vertical width of 110 cm and a horizontal width of 500 to 52 h+x. Then, by arranging seven air nozzles of the example and moving the dispersion plate in the direction of the arrangement, a nonwoven fabric with a predetermined thickness was obtained.

In addition, a nonwoven fabric was manufactured using the same raw material and the same manufacturing method using an air nozzle in which the entire mouthpiece 22 including the discharge pipe portion 22B was made of steel and processed into the same shape.

The quality results of the nonwoven fabrics of these Examples and Comparative Examples are shown in Table 1 below.

Table 1 Each number indicates the number per 10 liters.

10-ru = width 0.6m, length 5000m.

Arrival: Thickened part where filaments overlap and have a diameter of 5 cm or less.

Thread clump: Thickened part where filaments overlap, and is large with a diameter of 5 cm or more.

Thin wall unevenness; Thin wall portion that occurs at several orders of length.

As is clear from these results, the air nozzle of the example made of ceramic processing has fewer defects in the resulting nonwoven fabric than the one made of steel, and can be of high quality.

In addition, when a nonwoven fabric was manufactured for one month using the air nozzle of this example under the same manufacturing conditions as described above, no signs of scratches were observed on the ceramic processing part of the base 22, and no defects were found. It has become clear that non-woven fabrics with extremely low yields can be produced continuously.

〔Effect of the invention〕

According to the present invention, at least the inner periphery of the tip of the discharge pipe portion 22B of the mouthpiece 22 coupled to the nozzle member 20 is made of ceramic, so that no scratches on the inner wall surface are observed due to high-speed contact with the filament. First, a product with excellent wear resistance can be obtained. Therefore, unlike the conventional method, the dispersion of filaments is not deviated due to obstruction of the flow of filaments due to scratches, etc., and it is possible to obtain a high-quality nonwoven fabric in which the filaments are uniformly dispersed and free from unevenness.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the air nozzle for manufacturing nonwoven fabric of the present invention, and FIG. 1 is a longitudinal cross-sectional view of the whole,
FIG. 2 is a longitudinal sectional view of the main part of the cap. Also, the third
The figure is a longitudinal sectional view showing a conventional air nozzle. 10...Housing, 11...Compressed air chamber, 20
... Nozzle member, 22 ... Mouthpiece, 22B ... Discharge pipe part, 25 ... Ceramic coating layer, 40 ...
・Feed guide tube, 41...Air throttle tube. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] This is a manufacturing air nozzle that receives filaments spun by a spinning nozzle and sends the filaments onto a dispersion plate using an air jet to produce a nonwoven fabric.A nozzle member 20 is provided inside the housing 10 of this main body, 20 is provided with a conical diameter-reducing hole 21 into which the filament is introduced, and a cap 22 is connected around the top of the diameter-reducing hole 21.
1. A base 22 having a diameter-reduced hole 23a continuous with the same slope as the base 22.
A, and a discharge pipe part 22B that communicates with the diameter-reduced hole part 23a and extends straightly in the axial direction from the base part 22A, and
A compressed air chamber 11 into which compressed air A is introduced is provided inside the housing 10, and this compressed air chamber 1
Rectifying compressed air A in 1 and high flow rate air jet A_1
Then, an air constrictor tube 41 is connected along the outside of the discharge tube section 22B to flow toward the distal end, and the filament is placed on the air jet A_1 through a discharge guide tube 40 extending in the axial direction from the air constrictor tube 41. An air nozzle for producing a nonwoven fabric, which is configured to be delivered onto a dispersion plate, and at least the inner circumferential portion of the tip of the discharge pipe portion 22B of the mouthpiece 22 is formed of ceramic.