JPS6045625A - Nonwoven yarn having interlaced layer - 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 The present invention relates to a nonwoven yarn having a superentangled layer of densely entangled microfibers.

Conventionally, non-woven fabrics do not have knot points on their own like knitted fabrics, so when they were tried to be used in yarn-like materials, they lacked strength and the threads would come off when stretched, so they were not put into practical use. .

For this reason, it has not been possible to obtain a suede-like or leather-like string-like material using a nonwoven fabric base. For example, Utsukai Showa 57-14629
In No. 6, a suede-like string-like material is proposed, but a curled knitted metal base and raised material is used. However, such knitted fabrics or string-like items using woven fabrics tend to fray at the cut portion, so it is necessary to apply a binder such as polyurethane to prevent this from fraying, which results in a rubber-like rebound feeling. There were drawbacks such as hardness and hardness.

An object of the present invention is to improve the drawbacks of the conventional artificial leather yarns and to provide a nonwoven yarn with excellent strength, appearance, and feel.

In order to achieve this object, the present invention has the configurations described in the claims.

That is, the nonwoven yarn of the present invention has a square cross section,
At least one of the four surfaces or side surfaces is made of an extremely dense intertwined layer of ultrafine fibers and/or bundles thereof, so it can maintain sufficient tensile strength and does not fray when cut. It has an excellent appearance and quality, can be used on all four sides, and does not have a rubbery or repulsive feel. It is preferable that the ultrafine wires &f(-) forming the superentangled layer and/or their bundles are continuous with the ultrafine fibers or ultrafine fiber bundles forming the inner layer in the thickness direction of the nonwoven yarn because the strength is even better. If the super-entangled layer is made of ultra-fine fibers branched from the ultra-fine fiber bundle and the ultra-fine fiber bundle is thin, the inner layer is extremely thin. It is particularly suitable for its excellent surface appearance quality.

The nonwoven yarn with a square cross section in the present invention is.

It may be a square cross section with a ratio of approximately 1:1 in length and width, or it may be a rectangular cross section with different lengths, but if the cross section is extremely vertical or A rectangular cross section with different horizontal lengths is not meant in the present invention. The present invention includes even those having a rectangular cross section that can be used to form a yarn-like material in common sense. Vertical suitable for yarn.

The width to length ratio range is 10:1 to 1:10. Preferably it is about 5:1 to 1:5.

As the ultrafine fibers used in the present invention, ultrafine fibers directly produced by a method such as super draw or melt blowing may be used. However, if you want to obtain very fine fibers, these methods will cause spinning to become unstable, and processing will be difficult and difficult to handle. It is preferable to use it by modifying it into ultrafine fibers. For example, immediately after spinning, ultra-fine fibers are bundled and partially glued together into a single fiber.

Fibers with a chrysanthemum-shaped cross section in which one component is interposed radially between other components, multilayer bimetal fibers, multilayer bimetal fibers with donut-shaped cross sections, seabird fibers spun by melt-mixing two or more components, fiber axial direction A large number of continuous ultrafine fibers are arranged and aggregated and combined and/or partially combined with other components.
The polymer mutually arranged fibers that formed the book fibers are units in which a large number of ultra-fine fibers are arranged and aggregated and bonded with other components.
Further, there are special polymer array fibers that are arranged and assembled in large numbers and bonded with other components to form one fiber, and two or more types of these fibers may be mixed or used in combination. Microfiber-forming fibers having a cross section in which a plurality of cores are interveningly bonded and/or partially bonded to other components can be formed relatively easily by applying physical or chemical action or removing bonded components. It is preferably used because ultrafine fibers can be obtained. Dimensions. The multi-component ultrafine fiber-forming fiber is such that when at least one component is dissolved and removed, a bundle of 8 L of fibers mainly consisting of ultrafine fibers of 0.2 denier or less, preferably 0.05 denier or less is obtained.

It is more preferably used because a nonwoven fabric yarn having a particularly supple texture and smooth surface can be obtained. Even when directly spinning reed microfibers using melt blow or super draw methods, it is less than 0.2 denier.

Furthermore, 0.05 denier or less is preferable.

Figure 1 shows an example of ultra-fine fiber forming type fibers for obtaining ultra-fine and delicate properties. In the figure, 1 and 1' are ultrafine fiber components.

2 and 2' indicate bonding components. The crimped ultrafine fibers may be composite fibers made of different or similar polymeric materials, and crimped fibers, irregular cross-section fibers, hollow fibers R, If, and lotus root-like fibers can also be used. Furthermore, a mixture of different types of ultrafine fibers may be used.

-1: The ultrafine fiber in the present invention is made of a polymeric substance having fiber-forming ability.
6. Nylon 12. Polyamides such as copolymerized nylon,
polyethylene terephthalate.

Polyesters such as copolymerized polyethylene terephthalate, polybutylene terephthalate-1, and copolymerized polybutylene terephthalate, polyolefins such as polyethylene and polypropylene, and polyurethane.

Examples include polyacrylonitrile and vinyl polymers. Further, the binding component of the ultrafine fiber-forming fiber is caused by, for example, one component to be dissolved and removed.

Polystyrene, polyethylene, polypropylene.

Polyamide, polyurethane, copolymerized polyethylene terephthalate, which is easily soluble in alkaline solutions, polyvinylalkoneyl, and copolymerized polyvinyl alcohol.

Styrene-acrylonitrile copolymers, copolymers of styrene and higher alcohol esters of acrylic acid, and higher alcohol esters of carbon dioxide/methacrylic acid are used. Ease of spinning.

From the viewpoint of ease of dissolution and removal, polystyrene, styrene-acrylonitrile copolymers, copolymers of styrene and higher alcohol esters of acrylic acid and/or higher alcohol esters of methacrylic acid are preferably used.

Furthermore, if the draw ratio is high, fibers with high strength can be obtained.
A copolymer of styrene and a higher alcohol ester of acrylic acid and/or a higher alcohol ester of methacrylic acid is more preferably used. Also, in terms of making the ultrafine fibers easier to branch.

It is preferable to mix 0.5 to 30 weight percent of a polymer such as polyethylene glycol with the binding component or the component to be dissolved and removed. The fineness of the ultrafine fiber-forming fiber to be curled is not particularly limited.

0 due to stability in spinning, ease of sheet formation, etc.
The one with 5 to 10 deniers is f(4L).

The ultrafine fibers in the superentangled layer of the present invention preferably have a fineness of 0.2 denier or less. If the fiber is thicker than 0.02 denier, the rigidity of the fiber is too high and the flexibility of the superentangled layer and the appearance and quality of the surface are impaired, and cracks are likely to occur due to rubbing etc., resulting in a decrease in strength and density. It is difficult to form a supple superentangled layer. By using ultrafine fibers of 0.2 denier or less, preferably 0.05 denier or less, the fibers can be entangled closely.

It is possible to obtain a nonwoven yarn having a superentangled layer that can maintain strength, has good smoothness, is flexible, is hard to crack, and has an excellent appearance quality that feels good in the hand.

The fiber structure in the superentangled layer of the nonwoven yarn of the present invention requires that ultrafine fibers and/or bundles thereof are densely intertwined with each other. In other words, the fiber entanglement density is high. One method to measure the fiber entanglement density is to measure the distance between fiber entanglement points, which will be described later.
The fibers of the superentangled layer need to have an entangled density of 200 μm or less as measured by this method. This value is 2
Those with a structure larger than 00 μ, for example, those with a fiber structure with little entanglement in which the fibers are entangled only by needle punching, those with a structure in which ultrafine fibers or bundles thereof are simply arranged in a plane, or those with a structure in which ultrafine fibers or bundles thereof are arranged in a plane. Materials with a structure in which the surface of the base material is made up of dense fluff and are left to rest have little or no entanglement of fibers, so when subjected to abrasion, kneading, shearing force, etc., one surface becomes fluffy. This is not desirable because it tends to cause cracks. In order to eliminate these drawbacks, it is necessary that the distance between fiber entanglement points be 20[1 μm or less. If the thickness is 100μ or less, very favorable results can be obtained.

Here, the Va fiber intertwining point distance is a value determined by the following method, and is a measure of the denseness of the intertwining of fibers, and the smaller the value, the more dense the intertwining is. be. FIG. 2 is an enlarged schematic diagram of the constituent fibers in the grain layer when observed from the surface side. Let the constituent fibers be f,, f,, f,.

・・・・・・・・・Any two fibers f of the binding,
, f, are intertwined at the point ta, and the fiber f on top at a.

Trace the fibers to the point where they intersect under the other fibers, and let that intersection point be a, (intersection point of f, and f). Similarly, a,, a,, a,,...
shall be.

Next, the straight horizontal distance a, a, between the end points of the friendship,
l a2a,, a, a, l a4a51 a, a6.
a, a,, a7a,, a.

a,, a, a,, ayaw+ awaa+...
... is measured, and the average value of these many measured values is taken as the distance between fiber entanglement points.

In addition, the inner layer of the superentangled layer is mainly composed of ultrafine fibers or bundles thereof, and the ultrafine fibers and/or bundles thereof in the superentangled layer are continuous or branched from the ultrafine fibers or bundles thereof in the lower layer to become more dense. The fibers in the superentangled layer and the inner layer have a substantially continuous fiber structure,
It is preferably used because a yarn with a unified feel is obtained and the superentangled layer and the lower layer do not separate. An example of such a preferred fiber structure is shown in FIG. In FIG. 6, B indicates a superentangled layer, and A indicates an inner layer. Figure 3 0
), the inner layer is made of intertwined microfiber bundles.

This figure shows an embodiment in which the ultrafine fibers branched from the ultrafine fiber bundle and/or the bundle thereof exhibit a superentangled layer.

FIG. 6(b) shows an embodiment in which the Fi inner layer is not composed of entangled ultrafine fibers, but ultrafine fibers continuous from the ultrafine fibers are superentangled on the surface of the yarn. Such superentanglement may occur on all surfaces of the nonwoven yarns of the present invention. A typical example of this mode is shown in FIG.
It is preferable that the number of fibers contained in the bundle, which is as thin as possible compared to the thickness of the bundle in the lower layer, is as small as possible compared to the bundle in the lower layer, since unevenness is less likely to occur on the surface of the sheet material. In addition, conventional nonwoven yarns that use nonwoven fabric as a base material are easily deformed or plasticized by external forces when the base material is made only of fibers, so this prevents them from returning to their original shape. Therefore, resin was applied to the base material. but,
The nonwoven yarn of the present invention, which has a fiber structure in which ultrafine fibers and/or bundles thereof are densely intertwined, does not elongate abnormally even if no resin is added to the lower layer, and the yarn has good shape retention. Chiru. This is also a major feature of the nonwoven yarn of the present invention. Of course, the lower layer may contain a resin such as polyurethane elastomer.

The amount of resin applied varies depending on the intended use of the yarn. When used for clothing, 0 to 80 parts by weight of the fiber, miscellaneous rental,
In the case of materials, a coating amount of about 50 to 2D〇- is preferable. It may also be a grain layer formed of a composite consisting of a resin. Such a grain layer has a leather-like grain and is shaped like a grain (when it is rolled up, it becomes a grain layer made of integrated fibers and resin, and is similar to the conventional polyurethane film f: a grain layer of laminated artificial leather). In contrast, it is a leather-like non-woven yarn with a high quality appearance, good touch strength, and a surface that is resistant to deer and scratches, making it suitable for knitting and woven fabrics.

The sheet is extremely flexible and has a good touch. The resin used for the silver layer is, for example, polyamide.

Polyester, polyvinyl chloride, 7+Z IJ acrylic ester copolymer, polyurethane, neoplastic/.

Examples include styrene-butadiene copolymers, acrylonitrile-linked diene copolymers, polyamino acids, polyamino acid polyurethane copolymers, synthetic resins such as silicone resins, natural polymer resins, and mixtures of these.

Additionally, if necessary, plasticizers, fillers, and stabilizers.

Pigments, dyes, crosslinking agents, etc. may be added. , 4F IJ
Urethane resins or those obtained by adding other resins or additives to these resins are preferably used because they yield nonwoven yarns that have particularly soft texture and feel and good bending resistance. There are no particular restrictions on the adhesion structure of the resin on the grain layer, and it may vary depending on the purpose. However, in cases where flexibility or a soft feel is particularly required, such as for clothing, as it gets closer to the surface of the grain layer, Structures in which a large amount of resin is attached, structures in which the extremely thin outermost layer of the grain layer has a particularly large amount of 4iiJfn attached, and other structures have no resin attached at all or only a small amount if attached. It is preferable to have a structure in which the resin on one surface part is non-porous and the rest is porous. In addition, in cases where particularly high scratch resistance is required, such as for miscellaneous goods or material applications, it is preferable to have a structure in which the voids in the grain layer are filled with resin with almost no gaps.

As a method for manufacturing the nonwoven yarn of the present invention.

Ultra-fine fibers or ultra-fine fiber-forming fibers can be produced, for example, by a melt-blowing method or by a spinning device as disclosed in Japanese Patent Publication No. 18369/1985, stapled, and then passed through a random unit bar, card, or cross zipper to form a web. This is further needle punched to entangle the ultrafine fibers or ultrafine fiber-forming fibers to form a fiber sheet. Alternatively, the ultrafine fibers or ultrafine fiber-forming fibers are spun and subsequently stretched and placed randomly on a wire mesh, and the resulting web is needle punched in the same manner as described above to form a fiber sheet.

Next, the fiber sheet thus obtained is brought into contact with a high-speed fluid flow to cause the portion corresponding to the superentangled layer to be densely entangled or branched into ultrafine fibers and/or bundles thereof, and at the same time to be densely entangled. The fluid here refers to two liquids or gases, and in terms of percentage, it may contain extremely fine solids, but from the viewpoint of ease of handling, cost, and amount of collision energy as a fluid, Water is most preferably used. These fluids are pressurized and injected through small-diameter nozzles or narrowly spaced slits to form a high-speed columnar flow or curtain-like flow, which is brought into contact with the fiber sheet to branch and entangle the fibers. The pressure applied to the liquid varies depending on the form of the fibers in the fibers, and in the case of ultrafine fiber entangled bodies and ultra-fine fiber entangled bodies, the pressure to be applied to the liquid is 5 to 70 kg/C'' because they tend to become entangled or branched. Relatively low pressure is fine.

In the case of an entangled body of microfiber-generating fibers having a binding component, it is necessary to split, branch, and intertwine the binding component, so a high pressure of 70 to 300 kg/cm' is required.

Thereafter, if necessary to make the ultrafine fiber-forming fibers used ultrafine, the obtained fiber sheet is treated with a detergent that decomposes some components of the ultrafine fiber-forming fibers. Dissolve and remove some components.

Here, in the case of ultrafine fiber-forming fibers having components to be dissolved, some of the components may be dissolved and removed before being treated with a high-speed fluid flow. In this case, the fiber sheet is This is a preferred method because the ultrafine fiber-forming fibers are modified into bundles of ultrafine fibers and can be easily and highly branched and entangled with low fluid pressure.

Furthermore, high-speed fluid flow treatment may be performed before and after the step of dissolving and removing the partial components.

By subjecting one or both sides of a fiber sheet to such high-speed fluid flow treatment and slitting the fiber sheet in the longitudinal direction with appropriate gaps, the nonwoven yarn of the present invention having a superentangled layer on one or both sides can be obtained. Furthermore, if the sides are aligned after slitting and the high-speed fluid flow treatment is performed again, a nonwoven yarn with superentangled layers on 6 or 4 sides can be obtained. Alternatively, if necessary, a resin-containing type of nonwoven yarn can be obtained by impregnating a solution or dispersion of a resin such as a polyurethane distomer at an appropriate point after high-speed fluid treatment and coagulating it wet or dry. It will be done. Such impregnation may be performed either before or after the binding component dissolution step, if any.

Any point before or after slitting to make yarn may be used.

When the superinterlaced terminal layer is to be made into a grain layer, high-speed fluid treatment is performed in the desired manner as described above to form a layer in which ultrafine fibers and/or bundles of the obtained fiber sheet or slit yarn are intertwined. The solution or dispersion of the resin for the silver layer described above is applied by reverse roll coating, gravure coating, knife coating, slit coating, spraying, etc., solidified wet or dry, and layered on the roll surface or smooth sheet surface. Combining pressure and heating as necessary to integrate the fibers and resin and at the same time smooth the surface.

Here, it is preferable to use a fiber sheet, an emboss roll with a textured pattern, or a textured sheet before applying the resin, since integration, smoothing, and textured patterning can be performed at the same time. Also in this case, impregnation with a resin liquid such as polyurethane can be carried out in an appropriate step after the high-speed fluid treatment, if necessary. If this process is adopted, even if the adhesive force of the resin for the silver surface is strong as described above, the resin will penetrate into the superentangled layer, so it may be smoothed and integrated as is. Components to be dissolved When ultrafine fiber-forming fibers containing .

The method of applying a silver surface resin, performing an embossing treatment, and then performing a treatment for dissolving the components to be dissolved is most preferable in order to obtain a soft grain.

Furthermore, in order to color the nonwoven yarn of the present invention, a dyeing process or a finishing process can be applied at an appropriate stage if necessary. Dyeing may be carried out in the form of a sheet or yarn. Since the portion forming the superentangled layer of the nonwoven yarn of the present invention is a densely entangled body of ultrafine fibers or an integrated body of fibers and resin, it is extremely easy to dye and obtains good appearance quality and color development. I can do it.

The thus obtained nonwoven yarn of the present invention can be used as a thong-like material by itself, but if it is further made into a sheet material by knitting or woven fabric, it can be used for clothing with a supple texture and smooth surface feel. It is preferably used as a material for shoe uppers, handbags, bags, belts, bags, and gloves in various other applications.

The following examples are provided to clarify the present invention more clearly, and the present invention is not limited thereto.

In the Examples, the average value of the 1 part and 2 part values was taken as the average value.

Example 1 20 parts of 2-ethylhexyl acrylate, 80 parts of styrene
Consisting of 60 parts of 5% polyethylene glycol (molecular weight 20,000) added to vinyl polymer C (hereinafter referred to as AS resin) copolymerized in the proportion of 1.5 parts as a bonding component, and 4 parts of nylon 6 as an ultrafine fiber component. A polymer having a cross-sectional form as shown in Fig. 1 (Y), which has 16 island component groups in one filament, and each island component group has a large number of ultrafine fiber components with an average of 0.001 denier. A web was formed through the carded chrome bars using a 4.0 tenier, 511 stabilizer with reciprocal array fibers.

After that, needle punching was performed using a needle with a hook count of 1 to entangle the polymer mutually arranged fibers to create a nonwoven fabric (A).The thickness of the nonwoven fabric (A) was 2.0 mI.
II+, basis weight 4 [15g/m', apparent density 0.
20g/cm" ◇ Water was applied to the nonwoven fabric by applying a pressure of 100kg/cm2 from a nozzle in which holes with a pore diameter of 0.1 mm were lined up at a pitch of 0.6 cm between the centers of the holes, while swinging the nozzle. A nonwoven fabric (B) was obtained by spraying 6 times on one side of (A).The same high-speed water jet treatment was then applied to both sides of the nonwoven fabric (B) to obtain a nonwoven fabric (C).Next, the nonwoven fabric (C) was All the slits were slit so that the sides of the yarn obtained by slitting were facing up. At this time, each slit yarn was aligned perfectly so that the adjacent yarns were in contact with each other as much as possible. The resulting array of slit yarns was again subjected to the same high-speed water jet treatment as above to obtain a non-woven yarn φ).Next, a part of the non-woven yarn ψ) was turned over while being aligned and subjected to the same high-speed water treatment again. was carried out to obtain nonwoven yarn (6). Similarly to nonwoven fabrics (A), (B), and (C), medium 1
．． Slit to 5+nm.

Nonwoven fabrics (A), (B), and (C) were obtained.

These obtained nonwoven yarns (A), (B) # (
C), (D) After soaking in a 5-water emulsion of polyurethane and drying, the bonded components were dissolved in trichlorethylene, and AS
The resin was almost completely extracted and removed. Non-woven yarn (Shu) suffered from significant dimensional changes during this process and was easily stretched when stretched by hand, making it unusable for practical use. (E) had good shape retention and could be dissolved without any problems.These nonwoven yarns (B), (C), (D), (E)
Finished by dyeing with gold-containing dye.

Each non-woven yarn obtained is approximately 1.2x1.5mm
It has a rectangular cross section, (B) is a super entangled layer on the surface of the deerskin trunk that is supple and sticky, (C) is the front and back sides, (D ) has 6 sides.

＠) had four metal plates forming a super-entangled layer on the surface of the deerskin torso.

The polyurethane applied to these nonwoven yarns was extracted and removed with a solvent, and the distance between fiber entanglement points of the constituent fibers on the surface of the superentangled layer was measured. Non-woven yarn (B).

The average distance between fiber entanglement points in the superentangled layers of (C), (D), and (E) was 77μ to 95μ. In addition, according to the cross-sectional view of these nonwoven yarns, the ultrafine fibers that are densely intertwined in each superentangled layer are bundled inside to form ultrafine fiber bundles, (B), (C), (1st stage, (The fiber structure of Enoki is shown in Figures 4 (A), (B), and (C), respectively.
, the structure corresponded to (c).

Furthermore, knitted fabrics made by knitting these nonwoven yarns singly or in various combinations had excellent appearance quality, utilizing various combinations of smooth deerskin-like surfaces and non-superentangled layers.

Example 2 A mixture of 95 parts of polystyrene and 5 parts of polyethylene glycol was used as a bonding component, and 45 parts of polyethylene terephthalate was used as an ultrafine fiber component. Only about 700 ultrafine fibers were produced in one filament. !
-Go.

6, 8 of sea-island type mixed spun fibers containing i etc./7 a
Denier, 4"J' by random unit bar and needle punch using 511Il [D] 420 g
/m'.

A nonwoven fabric (F) having a density of 0.19 denier/cm'' was prepared.The ultrafine fiber component had a thickness ranging from 0.0005 to 0.01 denier, and the average thickness was 0.006 denier.

Separately, polyethylene terephthalate was spun using a melt-blowing method to form ultrafine fibers of 005 denier.

It was cut into 51 round pieces and subjected to a random uniform needle punching process to produce a nonwoven fabric (G) with a basis weight of 250 g/m' and a density of 0.23 g7 cm'.

Nonwoven Fabric (F) After being impregnated with a 5% aqueous solution of VC polyvinyl alcohol and dried to maintain its shape, all the bonded components were dissolved and removed with trichlorethylene, and then the polyvinyl alcohol was removed with warm water and dried. The basis weight of this sheet is 26
0 g/m', and the density was 0.2567 cm''.

Using the same nozzle as in Example 1, one side of the obtained nonwoven fabric (F) in which ultrafine fiber bundles are entangled and the nonwoven fabric in which ultrafine fibers are entangled (<0) is injected with 70k once at 50kg/am''.
Two high-speed water jet treatments were carried out at q/cm' while rocking the nozzle. In the obtained nonwoven fabric (F), the ultrafine fibers branched from the ultrafine fiber bundles in the lower layer and their bundles are densely intertwined with each other to form a superentangled layer with a distance between fiber entanglement points of 85 microns, as shown in Figure 6. It corresponded to (a). On the other hand, in the nonwoven fabric (G), the entanglement of the ultrafine fibers a in the surface layer was more dense than the entanglement of the ultrafine fibers in the lower layer, forming a super entangled layer, but the degree of entanglement was lower than that of the nonwoven fabric (F). The fiber entanglement point pressure #1 was 185 microns. The fiber structure of this product corresponded to that shown in Figure 6 (b).

Next, a solution prepared by adding a pigment to a 10% polyurethane solution was applied to the supercross-layered surface of these nonwoven fabrics using a gravure coater, dried, and then pressed through a heated embossing roll to emboss a leather-like grain pattern.

Further, it was dyed using a dispersion tooth $1'c and finished by the usual method.

These sheets were then slit into widths shown in the following table to obtain non-woven yarn (I) and non-woven yarn (G).

One side of both non-woven yarns is silver.

It looked very similar to a leather thong made of slit natural leather.

The properties of these non-woven yarns are compared with commercially available Ginki artificial leather without super-entanglement as shown in the table below.

This example had excellent strength. In this example, the nonwoven yarn (F) in which ultrafine fiber bundles are branched to form a superentangled layer is 91 stronger and has better appearance quality than the nonwoven yarn (G) made of entangled ultrafine fibers. It was excellent in that respect. In addition, the appearance and texture of the fabric woven with the grain layer facing up is also excellent in this example.

It was best to use non-woven yarn.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a typical example of ultrafine fiber generation type fibers. FIG. 2 is an enlarged schematic view of the constituent fibers in the grain layer when observed from the surface side. Figure 6 is an example of a cross-sectional view of the nonwoven fabric in the present invention.
In the figure, A indicates the inner layer part in which ultrafine fiber bundles (A) or ultrafine fibers (B) are intertwined. 1 In the figure, B is a superentanglement mainly consisting of ultrafine fibers branched from the inner layer ultrafine fiber bundles and/or their bundles. It shows layer (a) or super entangled layer (b) in which continuous ultrafine fibers are intertwined from the ultrafine fibers of the inner layer. FIG. 4 is an explanatory diagram showing a typical aspect of the formation of the inner layer portion (A) and the superentangled layer (B) in cross section in the slit yarn of the present invention. Patent applicant Toshi Co., Ltd.

Claims (6)

[Claims] (1) A nonwoven yarn having a square cross section, characterized in that at least one side thereof is made of ultrafine fibers and/''!, a fiber structure in which the distance between the fiber entanglement points of the bundle of bamboo shoots is 200 microns or less Non-woven yarn with super entangled layer. (2) The superentangled layer is made of ultrafine fibers and/or fibers in which the distance between fiber entanglement points of a bundle thereof is 200 microns or less.
．． A nonwoven having a superentangled layer according to claim (1), which is a grain layer formed of a composite mainly consisting of a structure and a resin present in the voids thereof. Yarn. (3) The lower layer of the superentangled layer is mainly composed of ultrafine fiber bundles, and the superentangled layer is mainly composed of ultrafine fibers branched from the lower layer of ultrafine fiber bundles and/or their bundles. Nonwoven yarn 78 having a superentangled layer according to claim 1 or 2, wherein the fibers in the lower layer and the superentangled layer are substantially continuous. (4) The lower layer of the superentangled layer is formed by ultrafine fibers intertwined relatively loosely with the superentangled layer, and the superentangled layer is formed by continuous ultrafine fibers from the lower layer. Nonwoven yarn 0 having a superentangled layer according to claim 1 or 2, characterized in that (5) Claims (1) to (4) characterized in that the superentangled layer exists on two opposing sides of the nonwoven yarn.
) A nonwoven yarn having a superentangled layer according to any one of paragraphs 1 and 2. (6) Claims (1) to (4) characterized in that the superentangled layer is present on all sides of the nonwoven yarn.
A nonwoven yarn having a superentangled layer according to any one of paragraphs.