JP7110522B2 - Fiber sheet with water infiltration directivity - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fiber sheet having water immersion directivity.
In this specification, the term “water infiltration directivity” refers to a portion that has a good affinity with water and has a property that makes it easy for water to permeate (hereinafter, this property is referred to as “permeability”). It means that the fiber sheet has at least one specific shape of the fiber sheet, and the permeable part has a specific directionality (directionality when water permeates). Here, "water inundation directivity" does not matter whether it is caused by the material itself constituting the sheet or by the sheet structure (knitted structure, etc.).

Moreover, unlike the "penetrability", the property of facilitating the exudation of water that has once been taken in is referred to as the "bleedability". However, "penetrability" and "bleedability" are not necessarily limited to the case where they are opposite terms, but include the case where they have both properties, for example.
For example, in a part where "penetration" is important, the name "penetration function zone" is given, focusing on the fact that the expected action and effect can be obtained. In some cases, the "band" can provide "bleedability". However, it is assumed that the 'bleeding property' in the 'penetration functional band' is not remarkable beyond the 'penetration property'.

Similarly, the name "bleeding functional zone" is given, focusing on the fact that the expected action and effect can be obtained at the site where "bleeding property" is important, and this "bleeding functional zone" In some cases, "penetrability" can be obtained. Also in this case, it is assumed that the "penetrability" in the "bleeding functional band" is not more remarkable than the "bleeding property".

Methods for producing a nonwoven fabric include a dry method, a wet method, a direct-spinning method, and the like (as an example of other methods, a method tentatively referred to as a “direct-melting method” is exemplified below).
The dry method and wet method are methods in which short fibers are first formed into a thin shape and then deposited into a thin form to form a web (something like thinly stretched cotton). The direct-coupling method and the fusion-coupling method are methods in which a raw material chip that has been melted is first spun, or a web is formed directly without spinning. A spunbond method is known as a direct spinning method, and a melt blown method is known as a direct melting method.

Webs formed by these manufacturing methods may be bonded or laminated by using a binder method, a heat welding method, or a physical entanglement method.
By the way, conventionally, a wiping material formed of a nonwoven fabric has been proposed (see, for example, Patent Document 1, etc.). This wiping material is provided with a first entangled portion and a second entangled portion, which are formed by creating a height difference in fiber density. In the second entangled portion, which is made to have a high density, dust with a small particle size is taken in.

In addition, Patent Document 1 describes that liquid sucking property can be obtained by using the second entangled portions so as to cause capillary action. In this case, it is expected that the results would be obtained on the basis of the optimal embodiment of the configuration with random orientation of the short fibers.

JP 2011-117095 A

It can be said that the wiping material according to the conventional proposal is configured mainly to take in granular dust. Therefore, even if an exceptional action of being able to obtain water absorption is found, no attention is paid to the characteristic action of retaining the absorbed water or conducting it to another place. However, it did not have a configuration for realizing the technical idea.

Hypothetically, using the water absorbency of this wiping material, if it were laid in a planting area, planted on it, and irrigated, etc., frequent water supply would be required because the wiping material has no or poor water retention. is expected to be In addition, since the water after water supply does not easily move in the planar direction, it is expected that water supply must be performed many times over a large area and a large number of water supply points.
In short, this wiping material does not substantially have water retention or water conductivity, or even if it does, it is so small that it is not suitable for practical use. You can say you can't use it.

The present invention has been made in view of the above circumstances, and has a property (penetrability) that has good affinity with water and makes it easy for water to permeate, and has a specific direction for this permeability. By providing a structure having a property (inundation directivity), water retention and water conductivity can be expressed, and these water retention and water conductivity can be used for applications such as laying in the ground of planting sites. To provide a fiber sheet having water infiltration directivity which can also be used.

In order to achieve the above object, the present invention takes the following measures.
That is, the fiber sheet having water infiltration directivity according to the present invention has a main body layer made of a nonwoven fabric, and the main body layer has a plurality of infiltration functional zones having a relatively low fiber density and a plurality of dense infiltration functional zones. The exudation functional bands are parallel to each other in the band longitudinal direction and are alternately arranged in the band width direction. It is characterized by being unidirectionally aligned while being aligned longitudinally.

The "penetration functional band" and "bleeding functional band" have already been defined.
The permeation functional zone of the main body layer is formed into a convex ridge with the longitudinal direction of the zone aligned with the fiber direction, and the exudation functional zone of the main body layer is concave with the longitudinal direction of the zone aligned with the fiber direction. It may be formed in a groove.
A backing layer is laminated on one side of the main body layer, and the backing layer and the main body layer are joined at a plurality of points along the fiber direction at positions overlapping the exuding functional bands of the main body layer. may be provided.

The fibers forming the nonwoven fabric of the main body layer can be continuous filaments.
Some of the fibers forming the backing layer are entangled in the main body layer, and some of the fibers forming the main body layer are entangled in the backing layer. It is preferable that a composite entangled structure is formed by
The backing layer can also be formed of a nonwoven fabric with random fiber orientation.

The backing layer may have higher water repellency than the main layer.

The fiber sheet having water infiltration directivity according to the present invention has a good affinity with water and has a characteristic (permeability) that makes it easy for water to permeate, and the permeability has a specific directionality. Since it has a configuration (inundation directivity), it can express water retention and water conductivity. can also be used.

BRIEF DESCRIPTION OF THE DRAWINGS The fiber sheet which concerns on this invention was shown, (a) is a top view, (b) is a side view. FIG. 2 is an enlarged view of part A in FIG. 1; 1 is a photograph showing the appearance of a fiber sheet according to the present invention. 1 is a photograph showing the composition of a fiber sheet according to the present invention; FIG. 4 is a schematic diagram explaining the operation when laid on a slope; 6 is an enlarged cross-sectional view taken along line BB of FIG. 5; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram explaining an example of the method of manufacturing the fiber sheet which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram explaining an example of the fiber used as the formation material of the fiber sheet which concerns on this invention. FIG. 3 is a schematic diagram explaining a test method for confirming the permeation performance of the fiber sheet according to the present invention. 4 is a graph showing the permeation performance when the fiber sheet according to the present invention is used as a single unit. It is a graph which showed the permeation|permeation performance when soil was covered with the fiber sheet which concerns on this invention, (a) is represented by the unit of minutes, and (b) is represented by the unit of time.

Embodiments of the present invention will be described below.
FIGS. 1 to 6 show a first embodiment of a fiber sheet having water infiltration directivity (hereinafter referred to as "the sheet of the present invention") 1 according to the present invention.
As is clear from FIG. 1, the sheet 1 of the present invention has a main body layer 2 as the nucleus of the structure. The body layer 2 is made of nonwoven fabric. In the illustrated embodiment, the backing layer 3 is laminated on one side of the body layer 2 .

In the main body layer 2, a plurality of permeation functional bands 5 formed in a belt shape and a plurality of permeation functional bands 6 similarly formed in a belt shape are arranged in the longitudinal direction of the band (horizontal direction in FIG. 1(a)). ) are parallel to each other, and the permeation functional bands 5 and the exuding functional bands 6 are arranged alternately in the band width direction (the vertical direction in FIGS. 1(a) and 1(b)). ing.
The size (area) of the main body layer 2, the number of permeation functional bands 5 and exuding functional bands 6 arranged, the band width (including the mutual ratio), the band length, the thickness, etc. are not limited at all. not a thing

The fibers forming the nonwoven fabric of the main body layer 2 are arranged in a single direction while matching the fiber direction with the longitudinal direction of the soaking functional band 5 and the exuding functional band 6 . Continuous filaments are preferably used as the fibers. More preferably, 80 wt % or more of the fibers forming the nonwoven fabric of the main body layer 2 are continuous filaments.
If it is less than 80 wt%, for example, when used as a base material in a planting area, there is a problem that the orientation of the penetration and exudation cannot be sufficiently exhibited (penetration dissipates not only in a specific direction but also in the surface direction. ) may occur.

Here, as shown in FIG. 8, for example, the continuous long fibers are made of polyester or the like, and are once twisted and heat-set (stage I), and then untwisted (second stage). step) (step III: also referred to as "false twisted yarn" or "woolly yarn").
By using such a yarn 10, suitable voids are likely to occur between adjacent fibers, and the water retention is enhanced, and the entanglement between the fibers is strengthened, thereby improving the shape retention and strength (especially in the width direction) as a nonwoven fabric. It is preferable in that it becomes stronger.

Such continuous filaments have a tendency to twist (slowly crimped) like an extended spiral over the entire length of the yarn, and are in a fluffed state. Therefore, when the continuous filaments are bundled (tow), the tow itself can provide fluffy bulkiness and water absorbency.
Specifically, a polyester woolly yarn of 220 dtex/72 f was used with a width of about 400 mm with tows of about 1800 threads/bundle×11 bundles.

Besides polyester, nylon fibers can be used, or polyester fibers and nylon fibers can be mixed.
As shown in FIG. 2, the permeation functional zone 5 and the exuding functional zone 6 are different in composition from each other by creating a difference in fiber density of the nonwoven fabric forming the main body layer 2. is. Naturally, the permeation functional band 5 is a relatively "coarse" portion, and the oozing functional band 6 is a relatively "dense" portion.

1 and 2 are schematic diagrams for easy understanding of the structure of the sheet 1 of the present invention, and do not accurately embody the actual composition (fiber structure). That is, the actual appearance is as shown in FIG. FIG. 3 shows a state seen from the backing layer 3 side, and the right side of FIG. 3 is turned over so that the main body layer 2 appears.
Also, the actual composition of the main body layer 2 is as shown in FIG. FIG. 4 is an enlarged view of 100 times magnification centering on the end face corresponding to the exuding functional zone 6. In FIG. You can check how close they are. That is, this dense portion is the bleeding functional band 6 . It can be seen that the fiber density is rough on both the left and right sides of the bleeding functional zone 6 , and this rough portion is the soaking functional zone 5 .

In addition, in the first embodiment, the permeation functional zone 5 is thickly formed as a "convex ridge" in which the longitudinal direction of the zone coincides with the fiber direction, and the seepage functional zone 6 is formed in the longitudinal direction of the fiber. It is formed thin as a shape of a "groove" that matches the direction.
As described above, the infiltration functional zone 5 has a lower density than the exuding functional zone 6, and is fluffy and thick (bulky), so that the permeability of water in the thickness direction in the composition is high. I can say. Of course, the permeation functional band 5 has high water permeability not only in the thickness direction but also in the band width direction and the band longitudinal direction. From these facts, it can be said that the permeation functional zone 5 has a composition with high water retention.

Here, for example, as shown in FIG. 5, it is assumed that the belt is inclined so that there is a height difference at both ends in the longitudinal direction, and water is supplied from the upper end side of the inclination. In this case, the water quickly permeates the interior of the permeation functional zone 5 and naturally flows down along the longitudinal direction of the zone to the lower end of the slope as if it were guided by the water pipe (see arrow X). Water diffuses into the exuding functional zone 6, and the entire surface becomes wet.

Conversely, when water is supplied from the lower end of the slope, the permeation functional zone 5 with low density has a weak suction force due to capillary action, but the high density exuding functional zone 6 causes capillary action. While supplying water to the infiltration functional zones 5 on both sides to the limit, the water is slowly moved up (see arrow Y), so that the entire surface becomes wet. In this manner, the permeation functional zone 5 and the seepage functional zone 6 exert their respective water conducting effects in accordance with the water supply direction, thereby exhibiting excellent water conducting performance regardless of the inclination of the ground.

Furthermore, when a large amount of water is supplied from the upper end, since the seepage functional band 6 is concave, the lower end side of the slant along the longitudinal direction of the band is made to flow like a river on the groove. can be allowed to flow down to
In addition, as shown in FIG. 6, the permeation functional zone 5 is arranged next to the permeation functional zone 6, so that the situation in which water flows along the permeating functional zone 6 is maintained. In this case, a phenomenon occurs in which the water on the exuding functional zone 6 is likely to be absorbed by the adjacent permeating functional zone 5 (see arrow Z). That is, the bleeding functional zone 6 also plays a role of supplying water to the adjacent soaking functional zone 5 and a role of keeping the soaking functional zone 5 in a full water state.

By the way, as a forming method for separately forming the infiltration functional band 5 and the exuding functional band 6 in the main body layer 2, interlacing by needle punching is suitable. However, interlacing by needle punching is not limited. For example, hydroentanglement, air entanglement, or the like can be employed. In addition to entangling, it is also possible to adopt a method of increasing the fiber density by means of pressurizing rollers, press molding, or sewing in some cases.

In the entangling by needle punch, a method of applying entangling only to a specific portion of the nonwoven fabric forming the main body layer 2 (the planned formation of the exudation functional band 6), and a method of applying entangling only to a specific portion of the nonwoven fabric forming the main body layer 2 are applied to other portions. There is also a method of making the punch density finer (concentrating) than (where the infiltration functional band 5 is to be formed). In any case, the exudation functional band 6 formed in this manner has more fiber entanglement points and higher interlacing strength than the permeation functional band 5, so the exudation functional band 6 itself is high. It becomes strength and can be said to be suitable.

In addition, due to such manufacturing circumstances, in the first embodiment, the sheet 1 of the present invention is formed in the longitudinal direction (permeation It is most efficient to manufacture along the fiber direction of the functional band 5 and the bleeding functional band 6). Therefore, the longitudinal direction of the permeation functional band 5 and the exuding functional band 6 in the main body layer 2 is the same as the so-called "machine direction (manufacturing direction)". However, as described above, the adoption of interlacing by needle punching for forming the exuding functional band 6 is not limited, so the relationship between the longitudinal direction of the band and the machine direction is not limited. .

As described above, the entanglement by needle punching is performed at the portion of the oozing functional band 6 , and the entanglement at this portion is used to laminate and fix the main body layer 2 and the backing layer 3 . That is, since the bleeding functional band 6 also serves as an interlayer fixing portion for laminating and fixing the main body layer 2 and the backing layer 3, the bleeding functional band 6 is entangled by needle punching to achieve high strength. This leads to high strength of the main body layer 2 as a whole, and it can be said that this point is also suitable.

In FIG. 3 , the dark striped pattern portion on the backing layer 3 is an intertwined portion where a part of the fibers forming the main body layer 2 (the exuding functional band 6) penetrates the backing layer 3 and emerges. .
In other words, the exuding functional band 6 is provided with connecting points for laminating and fixing the main body layer 2 and the backing layer 3 at a plurality of locations along the longitudinal direction of the band. can say

However, formation of such bonding points by entangling is not limited. In other words, the interlacing for forming the exuding functional band 6 and the connecting point for laminating and fixing the main body layer 2 and the backing layer 3 can employ different techniques.
For example, other methods of forming the bonding points include bonding with an adhesive, heat bonding by heating and melting melted threads or binders contained in the forming materials of the main body layer 2 and the backing layer 3, and fastening with a stapler or binding material. , sewing, etc., can be employed.

Further, when the bonding points are formed by entangling, the above-mentioned hydroentanglement, air entanglement, or the like can be adopted. However, since hydroentanglement, air entanglement, etc. are generally unidirectional from the side on which water or air is sprayed, the entangled fibers penetrate from the main body layer 2 to the backing layer 3 (or vice versa). Just put it out.
On the other hand, when needle punching is used for interlacing, a characteristic interentangling structure is formed by interlacing in both directions, as schematically shown in FIG. will be obtained. That is, some of the fibers forming the backing layer 3 are entangled within the main body layer 2 and some of the fibers forming the main body layer 2 are entangled within the backing layer 3 .

Therefore, entangling by needle punching has the advantage that the interlayer between the main body layer 2 and the backing layer 3 is firmly fixed.
The backing layer 3 is not particularly limited in its forming material, layer structure, properties (action) against water, and the like.
For example, it can be formed from a non-woven fabric in which the direction of fiber orientation is randomized. By doing so, the strength in the width direction is increased.

Specifically, a randomly oriented nonwoven fabric such as a spunbond nonwoven fabric (for example, trade name: Écoure 3151A manufactured by Toyobo Co., Ltd.) or a meltblown nonwoven fabric is preferable.
Polypropylene (PP) and polyester non-woven fabrics are suitable because they are non-hydrophilic materials. Alternatively, the surface of a non-woven fabric (nylon or cellulose), which is originally hydrophilic, may be subjected to a hydrophobizing treatment (a silicone or fluorine-based water repellent agent is attached).

Further, the backing layer 3 may have higher water repellency than the main body layer 2 . By doing so, it is possible to positively prevent water that has permeated the permeation functional zone 5 from permeating to the back side of the backing layer 3 through the backing layer 3 side. Therefore, the permeation property, water retention, and water conductivity along the longitudinal direction of the permeation functional band 5 can be exhibited more efficiently. In addition, the exuding property of the exuding functional band 6 can be exhibited more efficiently.

As a method for making the backing layer 3 more water repellent than the main layer 2, only the forming fibers of the main body layer 2 are subjected to hydrophilization treatment (hydrophilic agent treatment, surface modification, etc.), or the backing layer 3 side is There are a method of applying a water-repellent treatment (treatment with a water-repellent agent, etc.), a method of performing both of these methods, and a method of using different yarn types for the backing layer 3 and the main body layer 2 .
7 and 8 show an example of a method for manufacturing the sheet 1 of the present invention.

In order to manufacture the sheet 1 of the present invention, the continuous long fibers 10 (see FIG. 8) are wound from a bobbin 11, and the continuous long fibers 10 are once wound onto the reel 13 of the winder 12 to form a tow 14. After that, the tow 14 is unwound onto the belt conveyor 15.例文帳に追加
At this time, it is preferable to insert the tow 14 into the pipe 16 between the reel 13 and the belt conveyor 15 to regulate the threading position in the width direction. As a result, the belt conveyor 15 is prevented from having variations in weight in the width direction.

In addition, when transferring onto the belt conveyor 15, it is preferable to create a nipping state by the guide rollers 17 so that the basis weight in the feeding direction on the belt conveyor 15 is made uniform.
When the backing layer 3 as described in the first embodiment is provided, the forming material 22 unwound from the backing layer supply device 21 is sent directly to the needle punch device 20 (at the carry-in end of the belt conveyor 15). (not excluded), and may be superimposed on one side of the tow 14 .

The tow 14 stabilized in the width direction and the feed direction on the belt conveyor 15 is then entangled by the needle punch device 20 . In the entangling treatment, the main entangling position is the position where the exuding functional band 6 of the main body layer 2 is formed. However, even at the position where the permeation functional band 5 of the main body layer 2 is formed, entanglement is performed in several places (to the extent that bonding points for laminating and fixing the interlayer between the main body layer 2 and the backing layer 3 are sparsely generated). may

When forming the sheet 1 of the present invention in a wide width, a wide belt conveyor 15 is installed on the primary side of the needle punching device 20, and a plurality of tows 14 are supplied to this belt conveyor 15 at the same time. Good (not shown).
9 to 11 show tests for confirming the permeation performance of the sheet 1 of the present invention.

In the test, as shown in FIG. 9, an example or a comparative example of the sheet 1 of the present invention is placed on an inclined table 30, water is supplied from a position above the inclination on the inclined table 30, and the lower side of the inclination. It was done by investigating the relationship between permeation rate and time at the location.
The gradient of the inclination attached to the inclined table 30 was set to 2%. FIG. 10 shows the results of a test in which both Example and Comparative Example of the sheet 1 of the present invention were performed alone (assuming that the sheet is laid in a planting area with the upper surface of the sheet exposed), and FIG. This is the result of a test conducted by covering both Example and Comparative Example of Invention Sheet 1 with 3 cm thick soil (assuming that the sheet is buried in the soil at a planting site or the like).

In an embodiment of the sheet 1 of the present invention, continuous filaments of polyester fibers are used as a forming material, and the permeation functional zone 5 and the exuding functional zone 6 are separately produced in the main body layer 2 by entangling with a needle punch, and The body layer 2 and the backing layer 3 are laminated and fixed. The basis weight was 250 g/m ² .
On the other hand, in the comparative example, a fabric knitted by tricot knitting using polyester fiber variant yarn as a forming material was used.

The sample size was 10 cm in width and 110 cm in length (longitudinal dimension of the slope). However, the measurement distance was 100 cm.
As is clear from FIGS. 10 and 11(a), the test results show that in the comparative example, the amount of water permeation tends to decrease significantly over time as the amount of water on the water supply side decreases after water supply. It was clarified that in the example of the sheet 1 of the present invention, the decrease in water permeability over time tends to be well suppressed over a predetermined period of time exceeding 30 minutes. In addition, it can be understood that the sheet 1 of the present invention maintains a large amount of water even after 40 minutes.

In consideration of these examples and comparative examples, there was no difference between whether they were carried out without covering with soil (Fig. 10) or with soil (Fig. 11(a)).
More specifically, when considered from the viewpoint of the amount of water carried (water diffusion rate), the short-term test results (Fig. 10) without covering with soil showed that the Example of the sheet 1 of the present invention was the comparative example. The results are more than twice as good as those of the comparative example. 3 times at the initial stage (water level 3 cm) and about 5 times after 180 minutes (water level 1 cm).

In addition, limited to the case of covering with soil, as shown in minutes in FIG. was confirmed to appear as In addition, as shown in time units in FIG. 11(b), it was confirmed that in the example of the sheet 1 of the present invention, good results were maintained for a long time after water supply in comparison with the comparative example.

Using the same test equipment, we observed how water is absorbed by the soil (water diffusion performance to the soil) from the lower side of the slope to the upper side of the slope under a setting covered with soil. The suction height after 180 minutes at a point of 95 cm from the bottom of the slope (measured value of the thickness of the soil layer wet with reference to the upper surface of the sheet 1 of the present invention) was as high as 26 mm in the example. (That is, wetness could be confirmed at a position dug down 4 mm from the surface of the soil layer), whereas the comparative example remained at only 17 mm (digged down amount was 13 mm).

Furthermore, using the same test equipment, under the setting of covering with soil, holes were made in the soil at intervals of 10 cm along the slope direction, and water was absorbed into the soil from the lower side of the slope to the upper side of the slope. The appearance (water diffusion performance to the soil) was visually observed.
Thirty minutes after the start of the test, sufficient wetting was confirmed up to 30 cm from the bottom of the slope in the example, whereas wetting was confirmed only up to 10 cm in the comparative example. Similarly, at 70 minutes, the Example was 70 cm and the Comparative Example was 30 cm, and at 90 minutes, the Example was 80 cm and the Comparative Example was 40 cm.

In addition, when the water diffusion state of the soil surface layer was observed after being left for 20 hours, it was found that the wetness diffused up to a point of 40 cm in the example, while the wetness spread only up to a point of 15 cm in the comparative example. confirmed.
By the way, the present invention is not limited to the above-described embodiment, and can be changed as appropriate according to the embodiment.

For example, it is not limited to forming the permeation functional band 5 in the shape of a convex bank or forming the seepage function band 6 in the shape of a concave groove. Therefore, the soaking functional band 5 and the bleeding functional band 6 may have the same thickness so that the body layer 2 has a constant thickness (flatness).
As a method for producing a difference in fiber density between the infiltration functional zone 5 and the exuding functional zone 6, a method for producing a difference in the filling amount of the fibers alone or a combination with a method for producing a difference in the degree of compression. It is also possible to adopt

It is not excluded to use short fibers for the fibers forming the nonwoven fabric of the main body layer 2, and it is also possible to mix short fibers with long fibers or to use only short fibers. is.

1 Fiber sheet having water infiltration directivity (sheet of the present invention)
2 body layer 3 backing layer 5 soaking functional zone 6 exuding functional zone 10 continuous filament 11 bobbin 12 winder 13 reel 14 tow 15 belt conveyor 16 pipe 17 guide roller 20 needle punch device 21 layer feeding device 22 formation Material 30 Tilting table

Claims (4)

having a body layer made of nonwoven fabric,
In the main layer, a plurality of permeation functional zones having a relatively coarse fiber density and a plurality of exuding functional zones having a relatively dense fiber density are arranged alternately in the band width direction while the longitudinal direction of the band is parallel to each other. ,
The nonwoven fabric forming the main body layer is aligned in a single direction while the fiber direction is aligned with the longitudinal direction of the soaking functional band and the exuding functional band,
A backing layer is laminated on one side of the main body layer,
The backing layer and the main body layer are provided with a plurality of connecting points along the fiber direction at positions overlapping with the exuding functional bands of the main body layer ,
The permeation functional band of the main body layer is formed into a convex ridge with the longitudinal direction of the band aligned with the fiber direction,
The exuding functional band of the main body layer is formed in a concave groove with the longitudinal direction of the band aligned with the fiber direction,
A fiber sheet having water infiltration directivity , wherein the fibers forming the nonwoven fabric of the main layer include continuous filaments . The attachment point is
Some of the fibers forming the backing layer are entangled in the body layer, and
2. The fiber sheet having water infiltration directivity according to claim 1, wherein some of the fibers forming the main body layer are entangled in the backing layer to form a composite entangled structure. 3. The fiber sheet having directivity of water infiltration according to claim 1, wherein the backing layer is formed of a non-woven fabric whose fiber orientation direction is random. The fiber sheet having water infiltration directivity according to any one of claims 1 to 3 , wherein the backing layer has higher water repellency than the main layer.

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