JP4060284B2 - Artificial soil sheet for wall greening - Google Patents

Description

  The present invention is used as artificial soil for cultivating plants, and is particularly composed of a laminated body mainly composed of glass fiber, and installed on a wall surface composed of a vertical surface of a building or a structure or an inclined surface close to vertical. The present invention relates to an artificial soil sheet for wall greening that has excellent water retention.

Conventionally, instead of natural soil, artificial soil that is easy to handle and suitable for growing plants to be planted has been developed. In recent years, due to the effects of urban heat islands, the technology of greening the rooftops and outer walls of buildings has been attracting attention. When planting trees, artificial soils are installed on the rooftops of buildings and the like. A method of cultivating plants such as sedum having excellent dry resistance and cold resistance has been adopted. Artificial soil used for such greening of buildings must satisfy the standard value of the building load, and weight reduction is also desired from the viewpoint of workability for laying artificial soil.
As artificial soil for the purpose of weight reduction, cellulose fibers that have been dissociated from used newspapers are combined with a water-absorbent resin into a sheet form, and inorganic fibers such as glass fibers and rock wool fibers are added to the cellulose fibers. In addition, a sheet that has been combined with a water-absorbing resin to form a sheet has been proposed.

Furthermore, focusing on the outer wall space of buildings, wall greening technology for the purpose of greening the outer wall is being developed. Artificial soil for the purpose of wall greening is not easy to collapse in addition to the weight reduction required for artificial soil for rooftop greening, and it has a uniform water holding capacity throughout the artificial soil installed on the vertical wall. The required performance is required.
When a sheet composed of a fiber layer is used as artificial soil for wall greening, when the coarse fiber is used as the fiber constituting the fiber layer, the water retention is not good, and the plant wall is formed on the vertical wall surface for a long period of time. There is a problem that can not be nurtured. On the contrary, when fine fibers are used as the fibers constituting the fiber layer, there is a problem that water absorption, that is, moisture transfer / diffusion is deteriorated.
As artificial soil in consideration of wall greening, for example, a fine fiber web layer (2-120 dtex) and a coarse fiber web layer (100-5000 dtex) were formed using crimped fibers made of heat-adhesive conjugate fibers. A green molded structure in which a density gradient is formed from one side to the other side, and the coarse fiber fiber layer serving as a vegetation surface retains coconut shell compressed granules and a water-absorbing resin as a soil. Is disclosed (for example, Patent Document 1).
JP 2002-125453 A

However, the greening structure disclosed in Patent Document 1 uses crimped fibers of polyolefin resin or polyester resin, and the resin is water-repellent, so a fine fiber web layer is provided as a water retention layer. Even in this case, it is difficult to maintain the necessary water retention amount. For this reason, in order to maintain the amount of water retention necessary for plant growth from natural rainfall, etc., it is necessary to ensure the water retention by retaining the water absorbent resin in the coarse fiber fiber layer that becomes the vegetation surface. It was assumed that the water-soluble resin swells upon water absorption and breaks or relaxes the bond between fibers, so that it easily collapses and lacks weather resistance and durability.
In addition, it is not practical to irrigate the entire wall surface with a sprinkler or the like as in the case of irrigating the flat ground. Usually, the tube is disposed along the wall surface at regular intervals from the side of the artificial soil. To be irrigated. For this reason, artificial soil for wall greening has the ability to rapidly spread water supplied from the side of the artificial soil in the vertical direction along the wall surface and distribute the water uniformly throughout the artificial soil, and to the entire sheet surface. It is required to have uniform and excellent water retention.
Therefore, the present invention makes it possible to realize greening of the outer wall of the building, etc., so that it has weather resistance and durability, and water can be quickly and uniformly distributed over the entire seat surface. Another object of the present invention is to provide an artificial soil sheet for wall greening that has water retention.

The present inventors have conducted extensive studies results, in the case of using a sheet made of a fiber layer as an artificial soil sheets for wall greening, as the fibrous layer, and the water retention good fine fiber layer, the absorbent clogging water By combining a coarse fiber layer with good mobility and diffusivity, a fiber layer with good water retention and water absorption can be formed even on the wall surface, and by using glass fiber as the fiber constituting the fiber layer, It has been found that, together with the hydrophilicity of glass fibers, ultrafine fibers of 0.2 to 1 μm can be used as the fibers of the fine fiber layer, and a water retention layer with excellent water retention capability can be formed.
Based on such knowledge, the artificial soil sheet for wall surface greening of the present invention is an artificial soil sheet for wall surface greening comprising a laminate mainly composed of glass fibers, and the laminate is at least A fine fiber layer mainly composed of glass fibers having an average fiber diameter of 0.2 to 2 μm and enhancing water retention in the vertical direction; and an average fiber diameter of 1.2 times or more and 7 μm or less of the glass fibers constituting the fine fiber layer A coarse fiber layer mainly composed of glass fiber that enhances water absorption in the vertical direction, that is, water movement / diffusion, is unevenly distributed in the thickness direction, and the vertical liquid absorption time is 8 minutes / 10 cm or less. The length (after 24 hours) is 60 cm or more .
The artificial soil sheet for wall surface greening according to claim 2 is characterized in that, in the artificial soil sheet for wall surface greening according to claim 1 , the total thickness of the coarse fiber layer is thicker than the total thickness of the fine fiber layer. And
Moreover, the artificial soil sheet for wall surface greening according to claim 3 is the artificial soil sheet for wall surface greening according to claim 1 or 2 , wherein the laminate has the fine fiber layer and the coarse fiber layer alternately alternately. It is characterized by being unevenly distributed .
The sheet wall greening artificial soil sheet according to claim 4, wherein, in the green wall artificial soil sheet according to any one of claims 1 to 3, the fiber layer forming the laminate by a wet paper making It is formed.

The artificial soil sheet for wall surface greening of the present invention comprises a laminate mainly composed of glass fibers, and as the laminate, at least a fine fiber layer mainly composed of glass fibers having a small average fiber diameter and a large average fiber diameter. A laminate in which coarse fiber layers mainly composed of glass fibers are unevenly distributed in the thickness direction is used.
The artificial soil sheet for wall surface greening of the present invention, for example, is a case where water is irrigated only from the side surface of the sheet, and among the laminates of two or more layers, first, a coarse fiber layer having a large average fiber diameter is quickly absorbed. The fine fiber layer integrated with the coarse fiber layer has a small average fiber diameter and absorbs the water absorbed by the coarse fiber layer by capillary action. Therefore, water quickly spreads over the entire sheet surface, and water is uniformly retained throughout the sheet. For this reason, the artificial soil sheet for wall surface greening is suitable as artificial soil for wall greening which is laid vertically or substantially perpendicular to the ground and difficult to uniformly irrigate the entire laying surface.
In addition, the artificial soil sheet for wall greening of the present invention is composed of a laminated body mainly composed of glass fibers, and thus has a small density and light weight, is easy to handle, and has good workability when laid on a wall surface. There is an advantage that there is little risk of exceeding the reference value of the load capacity.
Furthermore, the artificial soil sheet for wall greening is composed of a laminate mainly composed of glass fibers, and as the laminate, at least a fine fiber layer mainly composed of glass fibers having a small average fiber diameter and a large average fiber diameter. Because the coarse fiber layer mainly composed of glass fibers used a laminated body that is unevenly distributed in the thickness direction, compared to the case where the laminated body is composed of only the fine fiber layer in consideration of water retention, by wet papermaking When the artificial soil sheet for wall greening is formed, the dehydration time, drying time, etc. can be shortened, so that productivity is improved, and the cost of material can be reduced because expensive fine fibers and cheap coarse fibers can be used in combination. .
Moreover, since the artificial soil sheet for wall greening is composed mainly of glass fiber, there is little risk of discharging harmful substances when discarded, and the constituent is nonflammable. In the unlikely event that it burns compared to the conventional artificial soil used, no toxic gas or the like is generated, and it is suitable as artificial soil for wall greening.
In the artificial soil sheet for wall greening, when the average fiber diameter of the glass fibers constituting the fine fiber layer is 0.2 to 2 μm, it is easy to intercept the water of the coarse fiber layer, so that the entire fine fiber layer is uniform. Water can be spread and excellent water retention is obtained.
Furthermore, when the coarse fiber layer is thicker than the fine fiber layer among the two or more layers constituting the artificial soil sheet for wall greening, the water diffusion rate becomes faster and the planted plant In addition to being able to supply water and nutrients quickly, it is possible to drain quickly from the coarse fiber layer during heavy rain, and it has the advantage that root rot of the planted plant is less likely to occur.

The artificial soil sheet for wall greening of the present invention comprises a laminate mainly composed of hydrophilic glass fibers, and as the laminate, at least a fine fiber layer mainly composed of glass fibers having a small average fiber diameter, and an average fiber A laminated body in which coarse fiber layers mainly composed of glass fibers having a large diameter are unevenly distributed in the thickness direction is used.
Thereby, it is possible to obtain an artificial soil sheet having good water retention by the fine fiber layer and good water absorption, that is, moisture transfer / diffusion by the coarse fiber layer, and having both good water retention and water absorption.
Since the laminate is mainly composed of glass fibers, a gap is formed between the fibers by the entanglement of the glass fibers, it is easy to absorb moisture, and has high water retention.
As the glass fiber, for example, a short glass fiber obtained by melting and spinning acid-resistant C glass and applying energy with a burner flame and blowing it, or a glass fiber spun as a long fiber after melting is used. it can.
As the hydrophilic glass fiber, E glass, A glass, silica glass and the like can be used.

  When the composition ratio of the glass fiber of the laminate is increased to 90% by mass or more, the density of the laminate can be reduced and the weight can be reduced, and the entanglement of the glass fibers becomes dense. Even when the artificial soil sheet is installed on the outdoor wall surface of a building or structure, the strength can be maintained without the risk of glass fiber scattering or spilling due to wind and rain. High weather resistance can be secured by UV resistance.

  It is preferable that the average fiber diameter of the glass fiber which comprises the said fine fiber layer is 0.2-2 micrometers. When the average fiber diameter of the glass fibers of the fine fiber layer is less than 0.2 μm, the voids in the laminate are too small, and the movement / diffusion of water in the fine fiber layer is deteriorated. Further, in order to maintain a high water holding capacity in the vertical direction, the average fiber diameter of the glass fibers of the fine fiber layer is preferably 2 μm or less, and more preferably 1 μm or less.

  In the artificial soil sheet for wall surface greening, the average fiber diameter of the glass fibers constituting the coarse fiber layer is 1.2 times or more and 7 μm or less of the average fiber diameter of the glass fibers constituting the fine fiber layer. It is preferable. When the average fiber diameter of the glass fibers constituting the coarse fiber layer is less than 1.2 times the average fiber diameter of the glass fibers constituting the fine fiber layer, the glass fibers constituting each laminate in which two layers are combined There is no difference in the average fiber diameter, so there is no difference from a laminate composed of a single layer mainly composed of glass fibers having a single average fiber diameter. This is not preferable because it is not different from a laminate composed of one layer. Moreover, when the average fiber diameter of the glass fiber which comprises the said coarse fiber layer exceeds 7 micrometers, a glass fiber loses a softness | flexibility, a fiber entanglement decreases and the intensity | strength of a coarse fiber layer cannot be ensured. This is not preferable because a low-density laminate cannot be formed.

When the coarse fiber layer is thicker than the fine fiber layer, the water diffusion rate is faster, the water deployment rate in the vertical direction is faster, and water and nutrients are quickly supplied to the plant planted on the sheet surface In addition, it is possible to drain water from the coarse fiber layer quickly during heavy rain.
Since the glass fiber constituting the coarse fiber layer has a large average fiber diameter, it is predicted that the strength as artificial soil is insufficient only by the entanglement of the glass fiber. For this reason, an organic binder, an inorganic binder, an organic fiber, an inorganic fiber, a microcapsule, etc. may be added as a strength reinforcing material to constitute a laminate. Further, in order to reinforce the strength without damaging the high water absorption of the coarse fiber layer as much as possible, an inorganic powder or organic powder having water absorption is arbitrarily added and adsorbed to form a laminate. Also good.

The artificial soil sheet for wall greening of the present invention can be produced using a dry nonwoven fabric production machine or a wet paper machine. Here, an artificial soil sheet for wall greening manufactured using a wet paper machine will be described.
(1) As a first raw material, for example, a predetermined amount of fine glass fiber having an average fiber diameter of 1 μm is weighed and uniformly dispersed and mixed in water by a separator such as a mixer or a pulper, and then transported to a first storage tank. , Store.
(2) As the second raw material, for example, 95% by mass of glass fiber having an average fiber diameter of 2 to 4 μm is mixed with 5% by mass of acrylic synthetic fiber for reinforcement, and dispersed uniformly in water by a separator such as a mixer or a pulper. After mixing, transport to second storage tank and store.
(3) Using the two types of raw materials stored in the first and second storage tanks as a papermaking type, using a circular net paper machine, a long net paper machine, or a slanting paper machine capable of two-layer papermaking, After the raw material is made into a sheet form as a first layer (fine fiber layer), the second raw material is made into a sheet form as a second layer (coarse fiber layer) on the first layer and superposed on it. The laminated body in a state of combining two layers in a paper state is passed through a pressure roll to be integrated.
(4) Then, through a drying process for drying moisture, a fine fiber layer mainly composed of glass fibers having a small average fiber diameter and a coarse fiber layer mainly composed of glass fibers having a large average fiber diameter are unevenly distributed in the thickness direction. An artificial soil sheet for wall greening is obtained.
If strong peel strength is required, after making the first layer into a sheet, for example, an acrylic emulsion binder is applied to the first layer of the sheet, and the second layer is formed into a sheet from above. It is good to dry after making paper, superimposing, passing through a pressure roll and integrating.
Moreover, not only the above-mentioned manufacturing method but also after making the laminate constituting the first layer and the laminate constituting the second layer separately, the two layers or a plurality of layers are integrated using an adhesive or the like offline. May be used.
Further, after obtaining a laminated body in which two layers are integrated by the paper making method, a plurality of laminated bodies may be further laminated and bonded with an adhesive or the like to form a laminated body of three layers or four layers or more.
In addition, for example, after obtaining a laminated body in which two layers are integrated by any one of the methods described above, the laminated body is bent, and the contact surfaces are bonded and bonded together with an adhesive or the like to form a three-layer laminated body. Also good.
Thus, since the thickness of the artificial soil sheet for wall greening increases, the laminated body which consists of a multilayer is suitable when planting a plant with deep roots.

  The artificial soil sheet for wall greening manufactured in this way is cold-resistant, requires less watering, and vegetation such as hedera (ivy) and the like that grows along the wall. It should be noted that the plant is not limited to the above-mentioned hedera (ivy) or the like, but may be any plant that is suitable for wall greening. The plant is preferably planted in a fine fiber layer having a higher water retention capacity than the coarse fiber layer because water and nutrients can be continuously supplied to the plant. In this way, by planting plants or accommodating the artificial soil sheet for wall greening before plant vegetation in a frame or the like and unitizing it, laying this unit on the wall of a building or structure, Wall greening with severe environmental conditions can be realized.

Next, although the Example of this invention is described in detail with a comparative example and a prior art example, this invention is not limited to this example.
Example 1
100% by mass of glass fiber having an average fiber diameter of 1.0 μm was dispersed and mixed in water, and then stored in the first storage tank as a raw material for the first layer. Next, 95% by mass of glass fiber having an average fiber diameter of 1.2 μm and 5% by mass of fibrillated acrylic synthetic fiber (manufactured by Mitsubishi Rayon: C300) as a strength reinforcing material are dispersed and mixed in water, and then placed in the second storage tank. Stored as two layers of raw material.
Using two types of raw materials stored in the first and second storage tanks as the papermaking type, a second paper having a thickness of 3.0 mm is formed on the first layer having a thickness of 1.0 mm by a paper machine capable of two-layer papermaking. The layers were combined and the two-layer laminates were combined and integrated, and dried through a hot air dryer at 220 ° C. to obtain an artificial soil sheet for wall greening.

(Example 2)
100% by mass of glass fiber having an average fiber diameter of 1.0 μm was dispersed and mixed in water, and then stored in the first storage tank as a raw material for the first layer. Next, 95% by mass of glass fiber having an average fiber diameter of 4.0 μm and 5% by mass of fibrillated acrylic synthetic fiber (manufactured by Mitsubishi Rayon: C300) as a strength reinforcing material are dispersed and mixed in water. Stored as two layers of raw material.
An artificial soil sheet for wall greening was obtained in the same manner as in Example 1 using the two types of raw materials stored in the first and second storage tanks as the papermaking type.

(Example 3)
100% by mass of glass fiber having an average fiber diameter of 1.0 μm was dispersed and mixed in water, and then stored in the first storage tank as a raw material for the first layer. Next, 95% by mass of glass fiber having an average fiber diameter of 6.0 μm and 5% by mass of fibrillated acrylic synthetic fiber (manufactured by Mitsubishi Rayon: C300) as a strength reinforcing material are dispersed and mixed in water. Stored as two layers of raw material.
An artificial soil sheet for wall greening was obtained in the same manner as in Example 1 using the two types of raw materials stored in the first and second storage tanks as the papermaking type.

(Conventional example)
After dispersing and mixing 100% by mass of core-sheath composite fiber consisting of a polyethylene resin having an average fiber diameter of 25 dtex and a fiber component having a melting point of 135 ° C. and a core component of polypropylene resin having a melting point of 162 ° C., the first storage tank And stored as a raw material for the first layer. Next, 100% by mass of a core-sheath composite fiber composed of a polyethylene resin having an average fiber diameter of 150 dtex and a fiber component having a fiber length of 5 mm and a melting point of 135 ° C. and a core component of a polypropylene resin having a melting point of 162 ° C. is dispersed and mixed in water. Stored in two storage tanks as raw material for the second layer.
Using two types of raw materials stored in the first and second storage tanks as the papermaking type, a second paper having a thickness of 3.0 mm is formed on the first layer having a thickness of 1.0 mm by a paper machine capable of two-layer papermaking. The layers were combined and the two-layer laminate was combined, and the sheath component was melted through a hot air dryer at 150 ° C. and firmly bonded to obtain an artificial soil sheet for wall greening.

(Comparative Example 1)
100% by mass of glass fiber having an average fiber diameter of 1.0 μm was dispersed and mixed in water, and then stored in the first storage tank as a raw material for the first layer. Next, 95% by mass of glass fiber having an average fiber diameter of 1.1 μm and 5% by mass of fibrillated acrylic synthetic fiber (manufactured by Mitsubishi Rayon: C300) as a strength reinforcing material are dispersed and mixed in water. Stored as two layers of raw material.
An artificial soil sheet for wall greening was obtained in the same manner as in Example 1 using the two types of raw materials stored in the first and second storage tanks as the papermaking type.

(Comparative Example 2)
100% by mass of glass fiber having an average fiber diameter of 1.0 μm was dispersed and mixed in water, and then stored in the first storage tank as a raw material for the first layer. Next, 95% by mass of glass fiber having an average fiber diameter of 8.0 μm and 5% by mass of fibrillated acrylic synthetic fiber (manufactured by Mitsubishi Rayon: C300) as a strength reinforcing material are dispersed and mixed in water. Stored as two layers of raw material.
First, as a paper species two types of raw material stored in the second storage tank, a thickness of 3.0mm on the first layer thickness 1.0mm by a two So抄 granulated possible paper machine No. I tried to make two layers, but because the average fiber diameter of the glass fiber of the second layer is too large and the wet paper strength is weak, it is possible to obtain an artificial soil sheet for wall greening that integrates the laminate of the two layers could not.

Next, with respect to the artificial soil sheet for wall greening obtained in Examples 1 to 3, the conventional example, and Comparative Example 1, the basis weight, density, vertical liquid absorption time, liquid retention amount by vertical height, ignition loss, heat resistance Was measured. The results are shown in Table 1. The test method was as follows.
[Basis weight]
An artificial soil sheet for wall greening is cut into a 10 cm square to prepare a sample. This sample is dried at 105 ± 5 ° C. for about 30 minutes, placed in a desiccator, allowed to cool, and then weighed. The data obtained by 10 times, and the basis weight (1 m ² per weight).
[density]
The sample whose basis weight was measured was measured at five places with a dial gauge thickness meter (19.6 kPa pressure), the average was taken as the thickness, and the basis weight was divided by the thickness to obtain the density (g / cm ³ ) To do.
[Vertical liquid absorption time]
An artificial soil sheet for wall greening is cut out to 5 cm × 108 cm as a sample, this sample is dried at 105 ± 5 ° C. for about 30 minutes, placed in a desiccator, allowed to cool, weight W ₁ (kg), average thickness t (mm) ) And mark the scale every 5 cm in the length direction. This sample is hung vertically at room temperature, and the lower end 5 cm of the sample is immersed in pure water, and the time taken to absorb each mark is measured. The time for sucking up to the position of 10 cm from the pure water level is defined as the vertical suction time.
[Voltage retention by vertical height]
The sample for which the vertical liquid absorption time was measured was left as it was for 24 hours, and then cut from the lower end with a 5 cm line from the lower end, and then cut every 20 cm, and the weight W ₂ of the five samples cut every 20 cm ( kg) is measured, and the amount of liquid retained by vertical height is determined according to the following formula. The specific gravity of pure water was calculated as 1.0, and the influence of temperature was ignored.
Vertical height Betsuho liquid amount _{^{(L / m 2 / mm)}} = (W 2 -W 1/108 × 20) / t × 100
[Loss of burning]
An artificial soil sheet for wall greening is cut into a 10 cm square to make a sample, this sample is dried at 105 ± 5 ° C. for about 30 minutes, placed in a desiccator, allowed to cool, and the weight (w ₁ ) is measured. Next, the sample is put in a crucible, a sample whitened after 2 hours in a 500 ° C. heating furnace is taken out, placed in a desiccator, allowed to cool, the weight (w ₂ ) is measured, and the loss on ignition is obtained according to the following formula. .
Loss on ignition (mass%) = (w ₁ −w ₂ ) / w ₁ × 100
[Heat-resistant]
The sample is heated in a heating furnace from room temperature to 300 ° C., and the state is observed.

Table 1 shows the following.
(1) The vertical liquid absorption time of the artificial soil sheet for wall greening in Examples 1 to 3 is compared with the artificial soil sheet for wall greening in Comparative Example 1 in which there is almost no difference in the average fiber diameter between the coarse fiber layer and the fine fiber layer. Thus, it was confirmed that the coarse fiber layer rapidly absorbed water when it was irrigated. On the other hand, the artificial soil sheet for wall surface greening having a two-layer structure composed of 25 dtex core-sheath fiber and 150 dtex core-sheath fiber could absorb water only up to a height of 7 cm, and the vertical liquid absorption time could not be measured.
(2) The liquid retention amount according to the vertical height of the artificial soil sheet for wall greening in Examples 1 to 3 was 7 times or more compared to the sheet of the conventional example, and it was confirmed that the water retention was very high. . Moreover, the artificial soil sheet for wall surface greening of Examples 1-3 compared with the artificial soil sheet for wall greening of the comparative example 1 was a little inferior in the water retention in the part away from the irrigated position.
(3) Since the artificial soil sheets for wall surface greening of Examples 1 to 3 have a large amount of liquid retained by vertical height, the range in which water can be retained is large, and can be unitized in large units every 60 to 100 cm square. It could be confirmed. For this reason, it is possible to greatly reduce the total number of units laid on the entire construction surface such as the outer wall for wall greening, and to significantly reduce the construction time and construction cost. In contrast, the conventional artificial soil sheet for greening has a low amount of liquid retained by vertical height and rises only up to 7 cm, so it must be divided into units of about 10 cm square and unitized. Compared to the artificial soil sheet for greening, it was estimated that the construction work took time and the construction cost increased.
(4) Since the artificial soil sheets for wall greening in Examples 1 to 3 are composed of a laminate mainly composed of glass fibers, they have high heat resistance, are hardly deformed even at 300 ° C., and the loss on ignition is as small as 5% by mass. . For this reason, even when laid in harsh environments that are exposed to direct sunlight in the summer, the sheet shape can be maintained, and the water retention is high, so it is excellent as an artificial soil sheet for wall greening that is installed near the rooftop where the environmental conditions are severe. It was confirmed that On the other hand, since the artificial soil sheet for greening of a conventional example has already deformed at 110 ° C. and is ignited and incinerated at 210 ° C. or higher, it has been found that it is not suitable for places with severe environmental conditions.

Claims (4)

An artificial soil sheet for wall surface greening composed of a laminate mainly composed of glass fibers, wherein the laminate is mainly a glass fiber having an average fiber diameter of 0.2 to 2 μm mainly to increase the water retention in the vertical direction. A fiber layer and a coarse fiber layer mainly composed of glass fiber having an average fiber diameter of 1.2 times or more and 7 μm or less of the glass fiber constituting the fine fiber layer and improving water absorption in the vertical direction, that is, water movement / diffusion. An artificial soil sheet for wall greening, characterized by being unevenly distributed in the thickness direction, having a vertical liquid absorption time of 8 minutes / 10 cm or less and a vertical liquid absorption height (after 24 hours) of 60 cm or more . The total thickness of the rough fiber layer, according to claim 1 Symbol mounting wall greening artificial soil sheet and wherein the thicker than the sum of the fine fiber layer. The laminate according to claim 1 or 2 Symbol mounting wall greening artificial soil sheet, characterized in that said fine fiber layer and the rough fiber layer is unevenly distributed alternately in succession. The fiber layer to form a laminate, wall greening artificial soil sheet according to any one of claims 1乃optimum 3, characterized in that at those sheet formed by a wet papermaking.