JPS58132154A - Nonwoven fabric and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention O Concerning a non-woven fabric existing in a horizontal pattern and a method for producing the same Non-woven fabric has conventionally been used as a material for sanitary products such as sanitary pads and disposable diapers, especially as a surface material for them.
There is. The nonwoven 4+1 as a surface material absorbs the liquid in spots without spreading it, maintains the liquid in a dry state after passing through it, and has an inverse fN of the liquid. It is desirable to have properties that can prevent this. Therefore, conventionally, nonwoven fabrics made by mixing hydrophilic fibers and mature fibers,
A nonwoven fabric consisting of multiple layers of hydrophilic fibers, hydrophobic fibers, or a mixture thereof, in which a hydrophilic fiber layer and a hydrophobic fiber layer are stacked and a part of one layer is ejected from the other layer. Nonwoven fabrics and the like have been proposed, and those consisting of 0 are in practical use. However, these known nonwoven fabrics are still unsatisfactory in terms of properties and are cumbersome to create! L high cost rC. There are drawbacks such as '2.

An object of the present invention is to provide a nonwoven fabric that has the above-mentioned properties and can be produced at low cost by utilizing the power of high-speed water flow without using special materials such as fiber binders, and a method for producing the same. It's about doing.

That is, the present invention provides a nonwoven fabric consisting of first component fibers and second component fibers, the nonwoven fabric comprising A. A first region where the component fibers are intertwined with the second component fibers, B
a second area with a low density, located between the first areas of each group, in which the second component fibers containing almost no first component fibers are present; Pfrg! material on a water-impermeable support. A non-woven fabric and a method for manufacturing the same, in which mold is removed by treating the non-woven fabric with a fine stream of water ejected from an oriice having a pitch of 100%.

A preferred embodiment of the present invention will be described below with reference to drawing t#.

In FIG. 1, a water-impermeable, substantially smooth-surfaced endless belt 1 serving as a first support is a roll 2.

3, and on the left side of the belt 10,
4 m of water-impermeable, substantially smooth-surfaced roll as second support. 4b, 4c, and 4d are arranged side by side. Above the belt 1 and the rolls 4ae4b*4c, 4d, nozzle bodies 5as5b+5c, 5d, 5.
(See Figures 2 and 3). A pair of squeeze rolls 7 for removing moisture from the pieces 6 to be processed are arranged on the left side of the roll 4d in the figure. Each nozzle 5m+5b, 5c*5d*5.
Pressure ill1! It is connected to a distribution tank 10 via an I-valve 8 and a pressure needle 9. The distribution tank 10Fi is connected to the filter tank 12 via the filter tank 12, which is connected to the pressure pump l2 driven by the motor 13.
Pump l4 is connected to tank l6 via pump l5. Belt l10 roll 4m
, 4b. 4c. A pan-shaped tank 17 is arranged in the lower surface area of 4d and 7, and is connected to the tank 16 through a tank 17H, a hole fl8, a filter box, and a screw 19'ft. The water in tank 16 is made high pressure by high pressure pump 14, pumped by filter tank 12, and supplied to distribution tank 10, and from tank 10 to each nozzle body 5m + 5b.
t5c*5d*5*, and from each orifice drilled at required intervals on the bottom of these nozzle bodies, a fine high-speed water flow is distributed to bell) 1 and roll 4a*4b*4a+4d+4.
e (see Figures 2 and 3).

In such an apparatus, the material to be processed 6 that is guided onto the belt 1 from the direction of the arrow 20 and transferred in the direction of the arrow 2l is the belt 1 and the rolls 4m+4b+4c.

4d, 4. When moving between the nozzle bodies 5b.
5c, 5d. When the material to be treated 6 contains a fiber web, the belt l is designed so that the high-speed water discharge from the orifice 5 imparts a fiber bonding force that does not cause disturbance or damage to the web shape when the material to be treated 6 contains a fiber web. At the top, the fibers are preliminarily entangled by a high-speed water stream from the orifice of nozzle 5&. Next, the material to be processed 6 is transferred to the roll 4a #4b
*4 Nozzle bodies 5b, 5c on e r4d yc
After the fibers are entangled step by step and in earnest with high-speed water flow, the fibers are squeezed by roll 7 to remove most of the water content, and the next drying process is carried out. Imported.

In the fourth section, the structure of the material 6 to be treated in the method of the present invention is shown. The treated side 6 is made by overlapping the first component fibers m6a and the second component rutted fibers 6b in a full layer and the first component fibers 6aij, and if the fibers are moved by the force of the jetted water stream, It may be a fiber ware that has been formed on a card or a fiber sheet that has been formed on a paper machine, but it is essential that the basis weight is 50 t/m"lid, preferably 25)/lts" or less. . If the basis weight is 501 f/m'' or more, it becomes impossible to distinguish between the nest 1 section and the second section, which will be described later.

If the first component fiber 6a moves in the direction of the two-component magnetic fiber 6b by the force of the jet water, the second component fiber 6b can be used in a card type Iit fiber ware/paper machine or Any other means may be used. Although the basis weight Fi of 6 m of second component fibers is not particularly limited, it is preferable that the total basis weight with the basis weight of 6 meters of first component fibers is 10054/- or less. Also, the first component fibers 6a and m2
As for the types of component fibers, for example, the combinations shown in the following table are used. However, in the following table, AFi water-bearing fiber and B represent hydrophobic fiber.

When a mixture of hydrophilic fibers and hydrophobic fibers is used, the ratio of both (heavy-duty) is determined depending on the purpose of the nonwoven fabric. For example, the surface of sanitary napkins and disposable diapers. In the case of a material, a mixture of 50% by weight of rayon fiber and 50% by weight of polyester fiber is arranged as the first component fiber 6a, 100% by weight of I-lyester fiber is arranged as the second component fiber 6b, or the first component fiber 6a is As the second component fiber 6b, a mixture of 50% by weight of rayon fiber and 50% by weight of cotton fiber is arranged, and as the second component fiber 6b, 501% of polyester fiber and 11% of polypropylene fiber are used.
A mixture of

5 and 6, a nonwoven fabric produced by the method of the invention is shown. As shown in Figure 4, the nonwoven fabric 22 is a treated material 6i, which is made by laminating a layer 1aJl component fiber layer 6at on top and a second component rutted fiber 6b on the bottom.
@1 The first support and the second
Belt l and rolls 4m, 4b, 4c as supports,
On 4d, the nozzle 5as5b+5c+5dt
When treated with a high-speed water stream jetted from each orifice drilled at a pitch determined by the bottom surface tLiM of 5., the fibers of the first component fibers 6a move in the thickness direction of the second component fibers 6b, and the density of mixing and intertwining increases. High first zones 23 are formed in the width direction of the non-woven fabric 22 at intervals corresponding to the pitch of the orifices and are continuous in the vertical direction. A second region 24 with a low density is formed in which the second component fibers are present and hardly contain the fibers 6a.

In order to distinguish the first zone 23 from W and the second zone 24, the first component fiber 610 needs to have a fiber weight of 50 ψ/- or less, as described above. It is preferable that the diameter #io, os~0.2cm, and the diameter #io, os~0.2cm, and the diameter #io of the oriice for forming the first area 23 and the second area 24 are 0.5~10 m. Figure 5 and #I6F! i! In the example shown in J, the width of the first area 230 is narrow and the width of the second area 24 is wide. The hydrophilic fiber t50 weight is used as the first component fiber 6m.
The above is arranged, #! Hydrophobic fiber 1 as bicomponent fiber 6b
When a 00 weight rice cake is placed, it is preferable that the first area 23 and the second area 24 are narrower than the latter, or that the two are approximately equal. This is because it can improve the property of absorbing the liquid, maintaining the dry state after permeation of body fluids, and preventing backflow of body fluids. When the fibers 1 made of card are arranged as the second component fibers 6b, it goes without saying that the fibers 1 also become entangled during the high-speed water flow treatment RKXj)118 on the material 6 to be treated.

In Figure 7, bell) l and o-le 4m'.

The behavior state of high-speed water flow during the fiber entanglement treatment on 4b, 4c, and 4d is shown in principle. The high-speed water flow 25 penetrates the material 6 to be treated, collides with the surface layer 1 of the support, that is, the rut 1 and the rolls 4m, 4b, 4c, and 4d, is repelled upward, and acts on the material 6 to be treated again. (cE, the material to be treated 6 is subjected to an entanglement treatment due to the interaction between the jet flow 25 and its repulsion flow 26, and as a result, the individual fibers in the material to be treated 6 move to the three-dimensional force plane. The fibers are entangled in a complex, strong, and efficient manner.After acting on the fiber entanglement, energy r
A part of the lost water flL#'i is removed from the surrounding area of the support body through the moving material 6,
It is collected in the tank 17. In order to cause high-speed water to repel at the surface of the support in this manner and to cause the repulsion flow to contribute to the entangling of all fibers, it is necessary that the surface hardness m of the support is sufficiently high. Therefore, in the trc of the present invention, the belt 1 is used as the first support and the roll 4 is used as the wJ2 support.

4bs4e*4a has a surface hardness defined by JIS-6301Hs [50' or more, preferably 70° or more. As long as it has such hardness and strength that can withstand the pressure of high-speed water flow,
The belt 1 and roll 4@.

4b, 4e, 4dl'i, metal, rubber, plastic, or a composite structure made of a combination thereof. The diameter of the roll 4m+4b+4c+4d is
In order to have strength to withstand the pressure of high-speed water flow and to improve drainage, it is preferable that the number is 50 to 300.

In FIG. 8, the nozzle bodies 5m and 5b.

The structure of the orifice 27 drilled in the bottom surface of 5c, 5d, and 5. is shown. The orifice 27 has a diameter of 0.
05 to 0.2 m, and its vertical cross section is shown in Figure 8 (A
), 俤), (C), and (2), the length L of the part 29 between the part 28 that gradually becomes smaller in diameter toward the lower surface and the part 29 that becomes straight. The ratio L/D to the radius is set to 4/1 or less, preferably V1 or less. Since the orifice 27 has such a structure #i, pressure loss due to water flow resistance in the orifice 27 is small. However, when the vertical cross-section of the orifice 27 is cylindrical with the same diameter,
If it is set to 1 or more, 1 J, the pressure loss due to water flow resistance will be large, and it will be quite disadvantageous in terms of distance.

The nozzle body 5a has such an orifice capacity of 27 kN.

The average supply amount in the width direction of the cylinder velocity water flow injected onto each support from 5b, 5c, 5d, and 5's is 40 cc/see -
cx or less, preferably 3 Qcc/-. '4 a r 4 b a 4 cr 4 d, the total flow rate t-F is injected into each 1, and the nozzle body 5
a H5b r5c, 5d, 5s effective width t
If W is the value obtained by l'/W. If the supply amount is 40"/I@c-cm or more, the high-speed water jet sprayed onto the belt 1 and the rolls 4m, 4b, 4e, and 4d will not be sufficiently drained, and the water will fall onto the material to be treated. Flood conditions occur, as a result of which the fiber entanglement process is disrupted, where the energy of the high-velocity water stream acting on the material to be treated is rapidly reduced, or, if the material to be treated contains a fibrous web, this is disturbed and its process stability is compromised. be exposed.

The injection pressure of high-speed water flow, more precisely, the nozzle body 5
The back pressure of a m 5 b n 5 c * 5 d 15 m is less than 35'kf/cml, preferably 15 ~
30 kp/m''-t'A, 35 to #/cIL1 or more, the movement of individual fibers in the material to be treated becomes large, the skeleton fibers are disordered, uneven fiber entanglement occurs, and 7 m1
#/I'' or less, it is possible to efficiently create a nonwoven fabric with excellent physical properties no matter how long the material to be treated is subjected to multi-fC high-speed water treatment or even if the nozzle body is brought close to the material to be treated. I can't.

In the above explanation, the nonwoven fabric used as a material for sanitary products and its manufacturing method have been described, but the method of the present invention uses relatively different components such as a conductive component, an insulating component, a dyeable component, and a non-woven fabric. It is applied to make non-woven fabrics depending on the purpose of use by using dyeable components, components with different melting points, meltable components and non-meltable components, both components with different elasticities, or elastic components and non-elastic components. be able to.

*Example m: 1.5 dX as the first component fiber x 51 rayon fibers Uni 11O weight - 1 as the second component fiber 1.4 d
The material to be treated with 44-I polyester fiber thread f100 superimposed and having a total basis weight of 20 FI/- was introduced into the apparatus shown in Fig. 1, and the injection pressure was 30 k#/m''.
A nonwoven fabric sample T- was obtained by processing with an average feed rate in the wheel direction of 8.5/a@c-m. Furthermore, when dyeing was carried out in the boiling liquid of this Sandelkura Calastin A (manufactured by Nippon Kayaku Co., Ltd.) l-bath solution, the rayon fiber was dyed yellow and the polyester fiber was dyed blue (Figure 6). reference). The characteristics of this sample were as shown in the table below.

According to the present invention, it is possible to obtain a nonwoven fabric in which component regions having relatively different properties, particularly properties relative to liquid, exist in a striped pattern. It has the property of maintaining a dry state after permeation and preventing backflow of liquid, and does not use special materials such as fiber binders.
It is rich in electrical properties, texture, breathability, warmth, etc., and is therefore extremely suitable for practical use, especially as a material for sanitary products.

In addition, since shin woven fabrics are formed by fiber entanglement using the power of high-speed water without using special materials such as fiber binders, it is possible to easily produce nonwoven fabrics with the above properties at low cost. Can be mass produced.

[Brief explanation of the drawing]

FIG. 1 is a schematic @ side view of an apparatus for carrying out the method of the present invention. FIG. 2 is a perspective view of the first support. Figure 3 shows #! 2 is a perspective view of the support body. FIG. 4 is a schematic sectional view showing the structure of the material to be treated. FIG. 5 is a schematic cross-sectional view showing the bonding state WAk of the W and I component fibers and the second component fiber of the material to be treated. FIG. 6 shows the nonwoven fabric set ML1 obtained by the method of the present invention.
r Photo shown enlarged. Figure 7 ts % Behavior of high-speed water flow acting on the treated material!
A schematic cross-sectional view shown in terms of eMkWm. FIG. 8 #J1 A vertical sectional view showing an example of the structure of an orifice. 1-=・First support body, 4m, 4b, 4e, 4d=・Second
Support, 5m, 5b, 5c, 5d, 5s - Nozzle, 6.
...Treated material, 6a...@11 synthetic fiber, 6b...M
22 synthetic fiber, 22... nonwoven fabric, 23... first zone,
24...jg2 area. ~3 Figure 4-334- Figure 8 (A)
(B) Procedural lottery calculation June n, 1986 11+l υ57; 1 Patent Application No. 13530 2 Name of the invention Jumyenfu and its preparation method 1; '``l'; 1 Mr. ?+ (t' +lJ+) Unicharm Co., Ltd. 4 Representative Person o: +Rami *Ashibeminato-ku Shin-3-12-12 Mr. Pill Toriba Name (6626) Patent attorney Yoshiharu Shirahama 8 h (1 position ζI Bessugu no Toosho 6th W!J 33

Claims (6)

[Claims] (1) A nonwoven fabric consisting of @11 component fibers and second component fibers having relatively different properties, the nonwoven fabric having A #
B and a second region with a low density in which the second component fibers, which contain almost no monocomponent fibers, are present. (2) The nonwoven fabric according to claim 1, wherein the first component fiber is a hydrophilic fiber and the second component fiber is a hydrophobic fiber. (3) The nonwoven fabric according to claim 1, wherein the first component fibers are hydrophobic kt fibers, and the second component fibers are hydrophilic fibers. (4) A material to be treated consisting of a layered layer of first component fibers and second component fibers having a basis weight of 50 t/m or less and having relatively different properties is placed on a water-impermeable support. The first component fibers of the material to be treated are traversed in the width direction, and oriswises are arranged so as to face each other in parallel at a required pitch, and a fine high-speed water stream is ejected from the orifice of the nozzle body at a pressure of 35 kp/m. ``By injecting and processing the following,
The first component fibers are arranged in parallel at intervals corresponding to the pitch of the orifices in the width direction of the carcass treatment material and are continuous in the longitudinal direction, forming a high-density first region in which the first component fibers intertwine with the second component material. and a nonwoven fabric fabric characterized by forming a high-density second region located between the first regions and containing almost no first component fibers and in which the second component purple material is present. Method. (5) The method for producing a nonwoven fabric according to claim 4, wherein the first component fiber is a hydrophilic fiber and the second component fiber is a hydrophobic fiber. (6) The method for producing a nonwoven fabric according to claim 1, wherein the @11 component fibers are hydrophobic fibers, and the second component fibers are hydrophilic fibers.