JP5105533B2 - Capping sheet for waste coating - Google Patents

Description

  The present invention relates to a capping sheet used in a waste disposal site or the like.

Conventionally, in landfills, after landfilling waste, in order to prevent rainwater from entering the landfill pit, the landfill area is capped with a capping sheet and the surface is covered with soil covering. ing. Since wastes are generally buried in uneven surfaces that are not flat, there is a problem that the capping sheet surface is undulated, and the cover soil slips and is displaced. For this reason, it is desirable for the capping sheet to have an anti-slip property such that the earth and sand covered on the surface does not slip. For example, Patent Document 1 discloses an auxiliary sheet for covering soil that has a slip-proof property of earth and sand by providing a linear body made of a thermoplastic resin on the surface thereof.
JP 2007-160185 A

  However, the technique disclosed in Patent Document 1 has a problem that a linear body made of a thermoplastic resin is peeled off from the surface of the fiber sheet, and as a result, the earth and sand slip and deviate. The present invention has been made in view of the above circumstances, and an object thereof is to provide a capping sheet for waste coating that is excellent in slip resistance.

The waste coating capping sheet of the present invention that achieves the above object is a waste coating capping sheet having a laminated structure of at least two layers comprising a first fiber sheet and a waterproof and moisture permeable sheet, on the surface of the first fiber sheet, slip prevention for fibrous material comprising a hot-melt adhesive is provided, the anti-slip for the fibrous material, the basis weight is ^{15g / m 2 ~100g / m 2} , a maximum fiber diameter 0. The minimum fiber diameter is 1 mm or more, and the minimum fiber diameter is 50% or less of the maximum fiber diameter. Since the anti-slip fibrous material provided on the surface of the first fiber sheet is made of a hot melt adhesive, it is excellent in adhesion to the first fiber sheet. Therefore, the fibrous material for anti-slip is prevented from peeling from the first fiber sheet, and the capping sheet for covering waste according to the present invention is excellent in anti-slip property.

  ADVANTAGE OF THE INVENTION According to this invention, the capping sheet for waste coating which is excellent in slip resistance can be provided.

The capping sheet for waste coating of the present invention is a capping sheet for waste coating having a laminated structure of at least two layers comprising a first fiber sheet and a waterproof and moisture-permeable sheet, and the surface of the first fiber sheet , the slip prevention for fibrous material comprising a hot-melt adhesive is provided, the anti-slip for the fibrous material, the basis weight is ^{15g / m 2 ~100g / m 2} , and the maximum fiber diameter is 0.1mm or more, The minimum fiber diameter is 50% or less of the maximum fiber diameter.

  First, an anti-slip fibrous material made of a hot melt adhesive provided on the surface of the first fiber sheet will be described.

  The hot melt adhesive used for the anti-slip fibrous material is not particularly limited, but it is preferable to use a polyolefin resin, a polyester resin, or a polyamide resin. Among these, polyolefin resins are particularly preferable because they are excellent in weather resistance and heat denaturation. These resins may be used alone or a mixed resin composed of two or more kinds of resins may be used. Moreover, in order to control the fluidity | liquidity and sliding property of resin, you may contain another component, for example, solid paraffin, an inorganic particle, etc.

  The melting point of the hot melt adhesive is 30 ° C. or more lower than the melting point of the fibers constituting the first fiber sheet (when the first fiber sheet has a core-sheath structure, the melting point of the core component is used as a reference). Is preferable, is preferably 50 ° C. or more, and more preferably 100 ° C. or more. If the melting point of the hot melt adhesive is 30 ° C. or more lower than the melting point of the fibers constituting the first fiber sheet, the hot melt adhesive is hot melted in the voids of the fibers of the first fiber sheet. The adhesive flows in and helps to improve the waterproofness of the capping sheet. The melting point of the hot melt adhesive is preferably 160 ° C. or less, and more preferably 120 ° C. or less. The melting point of the hot melt adhesive is preferably 50 ° C. or higher, and more preferably 80 ° C. or higher. If it is a hot-melt adhesive having a melting point of 50 ° C. or more, practically inconvenient softening does not occur by storing external heat from the sun or the like.

  The anti-slip fibrous material has a fibrous form made of the hot melt adhesive. The fibrous form is a form having an elongated shape like a fiber.

  The fiber material for anti-slip is preferably non-uniform in fiber diameter. The non-uniform fiber diameter means that the anti-slip fibrous material has different fiber diameters in one fibrous material.

  The anti-slip fibrous material preferably has a maximum fiber diameter of 0.1 mm or more, more preferably 0.3 mm or more, preferably 3 mm or less, and more preferably 2 mm or less. The minimum fiber diameter is preferably 50% or less of the maximum fiber diameter, more preferably 25% or less, and even more preferably 10% or less. By setting the maximum fiber diameter and the minimum fiber diameter of the anti-slip fibrous material within the above ranges, the capping sheet for covering waste according to the present invention has good soil-stopping properties. Further, the waterproof and moisture-permeable sheet is less likely to be damaged by the heat of the hot melt adhesive melted when forming the slip-proof fibrous material. As a method for measuring the maximum fiber diameter and the minimum fiber diameter, a capping sheet sample having a width of 100 cm × a length of 50 cm is used, and a scanning microscope surface photograph at a magnification of 20 times in a 5 mm square visual field at a point where the width is equally divided into six. (10cm × 10cm) is taken, the diagonal line connecting the lower left and upper right of the obtained surface photograph is drawn, the fiber diameter of the fiber intersecting the diagonal (the length of the diagonal overlapping the fiber) is measured, and each of the five locations The minimum fiber diameter and the maximum fiber diameter in the field of view were examined. Further, the ratio of the minimum fiber diameter and the maximum fiber diameter is the ratio of the minimum fiber diameter and the maximum fiber diameter in each field of view according to the fiber diameter measurement method, and an average value of five positions is adopted. Is the value obtained by

  The average value of the maximum fiber diameters (average value of the maximum fiber diameters at 5 locations) is preferably 0.1 mm or more, more preferably the maximum fiber diameter at each of the 5 locations is any. Is also 0.1 mm or more.

  The anti-slip fibrous material is preferably provided at random in order to increase the frictional force. Randomly provided means that the anti-slip fibrous material is provided in an arbitrary shape.

The basis weight of the anti-slip fibrous material is preferably 15 g / m ² or more, more preferably 25 g / m ² or more, preferably 100 g / m ² or less, and 60 g / m ² or less. More preferably. By setting the basis weight of the anti-slip fibrous material within the above range, the capping sheet for covering waste according to the present invention can ensure moisture permeability and also has an anti-slip effect.

  The method for forming the anti-slip fibrous material on the surface of the first fiber sheet is not particularly limited, and examples thereof include a spray method and a spiral jet method. When using the spiral jet method, for example, a hot melt adhesive melted from a nozzle is discharged from a predetermined height on the first fiber sheet by a spiral jet hot melt adhesive applicator, and the hot melt discharged is discharged. By causing the swirling air flow to collide with the adhesive and moving the nozzle in both the width direction and the longitudinal direction of the first fiber sheet, an anti-slip fibrous material having a variation in fiber diameter almost uniformly over the entire surface is obtained. It forms on the upper surface of a 1st fiber sheet.

The conditions for forming the anti-slip fibrous material can be appropriately set according to the fiber diameter or basis weight of the anti-slip fibrous material. For example, the nozzle diameter of the adhesive applicator is 0.2 mm to 1.5 mm. It is recommended that the height of the nozzle of the adhesive applicator from the first fiber sheet is 3 cm to 30 cm, and the discharge rate of the hot melt adhesive is 1 g / min to 3 g / min. The actual pressure of the swirling air flow varies depending on the nozzle orifice diameter, the air discharge hole diameter, and the like, but it is recommended that the actual pressure be 0.1 kgf / cm ^{2 to} 2.0 kgf / cm ² .

  Next, the waterproof and moisture permeable sheet constituting the waste coating capping sheet of the present invention will be described. The waterproof and moisture-permeable sheet imparts moisture permeability and waterproofness to the waste coating capping sheet of the present invention.

  The waterproofness of the waterproof and moisture permeable sheet is preferably 30 cm or more, more preferably 200 cm or more, and more preferably 500 cm or more, as measured by the water resistance test A method of JIS L 1092. More preferably it is. By using such a waterproof and moisture-permeable sheet having a water resistance level, the waterproof property of the capping sheet for waste coating of the present invention can be ensured.

As the moisture permeability of the waterproof and moisture permeable sheet, the moisture permeability measured in accordance with the JIS L 1099 A-1 method is preferably 100 g / m ² · 24 hr or more, and 1000 g / m ² · 24 hr or more. Is more preferably 5000 g / m ² · 24 hr or more. By using such a waterproof and moisture-permeable sheet having moisture permeability, the moisture permeability of the capping sheet for covering waste according to the present invention can be ensured.

  The waterproof and moisture-permeable sheet is recommended to be porous from the viewpoint of ensuring moisture permeability. For example, a porous sheet in which fine voids are formed by mixing a resin with inorganic fine particles such as calcium carbonate to form a sheet and stretching the sheet is exemplified. In particular, it is preferable to use a porous sheet produced by an inflation method as the waterproof and moisture permeable sheet. From experience, a porous sheet manufactured by an inflation method has good adhesion between a first fiber sheet and a second fiber sheet, which will be described later, and thus the waterproofness of the produced capping sheet for covering waste is increased. It is.

  The waterproof and moisture-permeable sheet produced by the inflation method preferably has an average value of vertical and horizontal shrinkage at 80 ° C. of 5% or more, more preferably 10% or more, and 25% or less. Is preferable, and it is more preferable that it is 20% or less. When the average value of the vertical and horizontal shrinkage ratios at 80 ° C. is in the above range, the waterproof and moisture-permeable sheet has an appropriate elongation and is difficult to shrink over time, so that it is waterproof at the junction of the capping sheet for covering waste. Due to the shrinkage of the moisture-permeable sheet, it is possible to prevent a decrease in waterproofness with time.

  The material constituting the waterproof and moisture-permeable sheet is not particularly limited, but for example, polyolefin resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer (EVA); fluorine-based materials such as polytetrafluoroethylene and polyvinylidene fluoride Resins are preferred, and low density polyethylene is particularly preferred. As such a waterproof and moisture-permeable sheet, for example, commercially available products such as Microtex (registered trademark) manufactured by Nitto Denko Corporation and Tetlatex (registered trademark) manufactured by Donaldson can be used. It is also possible to use an SMS nonwoven fabric using a nonwoven fabric or ultrafine fibers.

  In order to prevent the waterproof and moisture permeable sheet from being damaged due to external force during laying, the waterproof and moisture permeable sheet preferably has an appropriate elongation at break and tear strength.

  The waterproof and moisture-permeable sheet preferably has a breaking elongation measured according to JIS L 1906 of 250% or more, more preferably 300% or more, and further preferably 400% or more.

  The waterproof and moisture-permeable sheet preferably has a tear strength measured according to the JIS K 7128 1 method of 0.75 N or more, more preferably 1.0 N or more, and 2.0 N or more. Further preferred.

  When the breaking elongation rate or tear strength of the waterproof and moisture permeable sheet is equal to or higher than the lower limit, the waterproof and moisture permeable sheet is not easily damaged due to external force during laying, and thus the capping sheet for covering waste can maintain high waterproof properties. .

  Further, the thickness of the waterproof and moisture-permeable sheet is not particularly limited as long as the waterproofness and moisture permeability can be secured, but is preferably 50 μm or more, more preferably 80 μm or more, and preferably 200 μm or less. More preferably, it is 150 μm or less. It is recommended that the thickness of the waterproof and moisture-permeable sheet be in the above range from the viewpoint of balance of characteristics, cost, and workability.

The basis weight of the waterproof and moisture-permeable sheet is not particularly limited, but is preferably 50 g / m ² or more, more preferably 80 g / m ² or more, and preferably 200 g / m ² or less, 150 g / m ^2. More preferably, it is m ² or less. It is recommended that the weight per unit area of the waterproof and moisture permeable sheet is within the above range from the viewpoint of appropriate moisture permeability and durability over time.

  Next, the 1st fiber sheet which comprises the capping sheet for waste covering of this invention is demonstrated. The first fiber sheet is laminated on the surface side (covering side) of the waterproof and moisture-permeable sheet. By using a 1st fiber sheet, the weather resistance of the capping sheet for waste covering of this invention can be improved.

  The first fiber sheet preferably has a light shielding rate of 90% or more, more preferably 95% or more, measured according to the JIS L 1055 A method. If the light shielding rate of the first fiber sheet is equal to or greater than the lower limit, if the construction is performed with the first fiber sheet on the outside (opposite side of the waste), the waterproof / breathable sheet is highly prevented from being changed and weather resistance is improved. Can be improved.

  The first fiber sheet is a sheet composed of fibers and is not particularly limited as long as the light shielding rate can be satisfied. For example, a woven fabric, a nonwoven fabric, a knitted fabric composed of various known fibers, A split cloth can be used.

  The material of the fibers constituting the first fiber sheet is not particularly limited, and examples thereof include: polyesters such as polyethylene terephthalate and polybutylene terephthalate; aliphatic polyamides such as nylon 6, nylon 66, nylon 46, and nylon 12; aroma such as aramid Polyamides such as group polyamides; polyethylenes are common. Resins such as wholly aromatic polyesters, so-called ultrahigh molecular weight polyethylene, polyphenylene sulfide, polyether ketone, and the like can also be used as the material for the fibers. These materials may be used alone, or two or more of them may be mixed and used as long as the effects of the present invention are not impaired. Among these, in terms of cost, weather resistance, etc., fibers made from the polyesters illustrated above are preferable.

  The first fiber sheet is preferably colored in order to ensure the light shielding rate. As the dye to be used, those which are difficult to change during spinning are preferable. Specific examples include carbon black and inorganic pigments.

  Although there is no restriction | limiting in particular about a hue, Usually, since the 1st fiber sheet side colored with this pigment | dye becomes the outermost surface, the pigment | dye which becomes a suitable color according to the place where the capping sheet of this invention is applied. Just choose. Therefore, the coloring matter may be used alone, or a plurality of types may be mixed and used in order to adjust the hue.

  The first fiber sheet is preferably embossed in order to ensure mechanical strength, wear durability, and adhesion strength with the anti-slip fibrous material. Moreover, it is preferable that the area ratio of embossing is 3 to 23%.

  The thickness of the first fiber sheet is preferably 0.3 mm or more, more preferably 0.4 mm or more, preferably 1.0 mm or less, and more preferably 0.8 mm or less. . When the thickness of the first fiber sheet is within the above range, water permeation at the joint is minimized when joining a plurality of capping sheets for covering waste.

The basis weight of the first fiber sheet is not particularly limited, but is preferably 70 g / m ² or more, more preferably 100 g / m ² or more, and preferably 300 g / m ² or less, 200 g / m ^2. More preferably, it is m ² or less. By setting the basis weight of the first fiber sheet within the above range, it is possible to ensure workability, flexibility, and a sufficient reinforcing effect. When the basis weight of the first fiber sheet is less than the above range, the effect of improving the strength of the capping sheet may be insufficient. On the other hand, if the basis weight of the first fiber sheet exceeds the above range, it is economically disadvantageous, and the capping sheet becomes hard and the workability tends to be lowered.

  The surface of the first fiber sheet may be surface-treated with a low melting point acrylic, a polyester elastomer, or a polyolefin elastomer rubber material. Dipping or coating may be performed.

  It is preferable that the waste coating capping sheet further includes a second fiber sheet laminated on the waterproof and moisture permeable sheet. The second fiber sheet is laminated on the waste side of the waterproof and moisture permeable sheet (opposite side of the first fiber sheet). Even when applying to illegal dumping places where there is a concern that water resistance may be impaired due to holes or tears in the capping sheet caused by injection needles etc. contained in the waste by using the second fiber sheet, capping for waste covering The waterproofness of the sheet can be effectively maintained.

  The second fiber sheet preferably has a penetration resistance measured in accordance with ASTM D 4833 of 200 N or more, and more preferably 300 N or more. By adopting the configuration including the second fiber sheet having a penetration resistance of 200 N or more, the waterproofness of the capping sheet for covering the waste can be effectively maintained when the sheet is laid.

  Further, the second fiber sheet is not particularly limited as long as it has the penetration resistance and can secure the later-described moisture permeability of the capping sheet for covering waste according to the present invention. Examples include non-woven fabrics and woven and knitted fabrics. The second fiber sheet may be the same as the first fiber sheet, but since the fiber sheet side is on the inside (waste side), the light shielding function is not necessary.

  The thickness of the second fiber sheet is not particularly limited, but is preferably 0.2 mm or more, more preferably 0.6 mm or more, and preferably 10.0 mm or less, and 5.0 mm or less. More preferably. By setting the thickness of the second fiber sheet within the above range, the waterproof property at the joint portion of the capping sheet for waste coating of the present invention can be maintained, and the appropriate flexibility and handling property of the capping sheet are also good. It can be.

The basis weight of the second fiber sheet is not particularly limited, but is preferably 50 g / m ² or more, more preferably 150 g / m ² or more, and preferably 1000 g / m ² or less, 500 g / m ^2. More preferably, it is m ² or less. By making the basis weight of the second fiber sheet within the above range, it is easy to maintain the waterproof property of the capping sheet for covering waste according to the present invention and it is not expensive.

  The capping sheet for covering waste according to the present invention is preferably obtained, for example, by laminating and integrating the first fiber sheet, the second fiber sheet, and the waterproof and moisture permeable sheet. As a method for integration, for example, a method using an adhesive may be mentioned. In the above-mentioned method, it is necessary to consider so as not to impair moisture permeability. For example, it is recommended to partially thermally bond using hot melt powder, hot melt fiber type adhesive, or the like.

  The procedure for integrating the laminate is not particularly limited, for example, a method of stacking and integrating the waterproof and moisture-permeable sheet and the second fiber sheet after providing a slip-proof fibrous material on the surface of the first fiber sheet, After the first fiber sheet is laminated and integrated with the waterproof and moisture permeable sheet and the second fiber sheet, a method for providing a slip-proof fibrous material on the surface of the first fiber sheet, and the first fiber sheet and the waterproof and moisture permeable sheet are laminated. For example, the order of stacking and integrating with the second fiber sheet after providing the anti-slip fibrous material on the surface of the first fiber sheet.

  The capping sheet for covering waste according to the present invention preferably has a water resistance level measured in accordance with the provisions of the water resistance test A method of JIS L 1092 of 50 cm or more, from the viewpoint of ensuring waterproofness, and is 100 cm or more. It is more preferable that it is 2000 cm or more. If it is a capping sheet for waste covering that has a water resistance level equal to or higher than the lower limit, it can sufficiently prevent rainwater from penetrating into the waste even if it is used for capping waste. Contamination of the underlying soil can be suppressed.

The capping sheet for waste coating according to the present invention preferably has a moisture permeability of 100 g / m ² · 24 hr or more measured in accordance with the JIS L 1099 A-1 method from the viewpoint of ensuring moisture permeability. It is more preferably 1000 g / m ² · 24 hr or more, and further preferably 3000 g / m ² · 24 hr or more. If the capping sheet for waste coating has a moisture permeability equal to or higher than the lower limit value, it suppresses bulging due to pressure increase in the capping space due to generation of gas or water vapor from the waste, and the capping sheet for waste coating Breaking can be prevented.

  The capping sheet for waste coating of the present invention has an intermediate value (median) of a friction angle on the surface measured in accordance with the JIS P 8147 method of 37.5 ° or more from the viewpoint of ensuring the slip resistance. Preferably, it is 38 ° or more, and more preferably 39 ° or more. If the capping sheet for waste coating has an intermediate value (median) of the friction angle on the surface equal to or higher than the lower limit value, it is excellent in slip resistance and can secure the soil retaining property of the earth and sand covered on the surface.

  The waste coating capping sheet of the present invention includes one obtained by joining a plurality of the waste coating capping sheets. Examples of the joining method include a sewing method and a heat fusion method. In the case of joining by the heat fusion method, a part of the anti-slip fibrous material made of the hot melt adhesive provided on the surface of the first fiber sheet melts faster than the first fiber sheet, and serves as a sealant. Therefore, a capping sheet for waste coating having good water resistance and bonding strength at the bonded portion can be obtained. In the heat fusion method, it is preferable that a plurality of the capping sheets for covering the waste are joined together in a state where both the anti-slip fibrous material and the second fiber sheet are melted simultaneously by heat. Further, the first fiber sheet may be melted at the same time.

In addition, it is also suitable to use the adhesive tape which forms an adhesive layer in the single side | surface of a fiber sheet for the junction part formed by joining. The material and forming method of the sheet constituting the adhesive tape are not particularly limited, and for example, the material and forming method exemplified for the first fiber sheet can be adopted. The sheet constituting the adhesive tape preferably has a basis weight of 100 g / m ² or more. If it is a sheet | seat of such a fabric weight, since it has a weather resistance, the abnormal change of an adhesive layer can be suppressed. From this point of view, it is recommended that the adhesive tape sheet is also colored in the same manner as the first fiber sheet. The details of coloring are as described above for the first fiber sheet. Furthermore, it is preferable that the sheet | seat of an adhesive tape is the same raw material and the same color as a 1st fiber sheet. The pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer is not particularly limited, and for example, a butyl rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a pressure-sensitive adhesive applied to a known cloth tape, or the like can be used.

  The joint portion preferably has a water resistance level measured in accordance with the provisions of JIS L 1092, water resistance test A method, of 30 cm or more, and more preferably 50 cm or more. When the water resistance level of the joint is 30 cm or more, the capping sheet for covering waste can suppress water permeation through the joint interface, so that sufficient waterproofness can be maintained even at the joint.

  The bonding portion preferably has a bonding strength of 350 N / 5 cm or more, more preferably 500 N / 5 cm or more, measured in accordance with JIS L 1906. When the joint strength of the joint is 350 N / 5 cm or more, the capping sheet for covering wastes can minimize the damage of the joint due to external force.

  The capping sheet for covering waste according to the present invention is coated in accordance with the area of the waste dumping site with the non-slip fibrous surface facing outside, and is fixed by a known method (pinning or the like).

  The capping sheet for covering waste according to the present invention can secure the earth retaining property of the earth and sand covered on the surface, has high weather resistance, and can maintain waterproofness for a long period of time.

  Hereinafter, the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments shown in the drawings.

  FIG. 1 is a cross-sectional explanatory view illustrating a waste coating capping sheet of the present invention. The waste coating capping sheet 10 of the present invention includes a first fiber sheet 1, a second fiber sheet 3, and a waterproof and moisture-permeable sheet 2 laminated between the first fiber sheet 1 and the second fiber sheet 3. And an anti-slip fibrous material 4 made of a hot melt adhesive is provided on the surface of the first fiber sheet 1.

  FIG. 2 is a photograph of the anti-slip fibrous material provided on the surface of the first fiber sheet. FIG. 3 is a scanning microscope (SEM) surface photograph (20 ×) of the anti-slip fibrous material provided on the surface of the first fiber sheet. 2 and 3, an anti-slip fibrous material 4 made of a hot melt adhesive is provided on the surface of the first fiber sheet 1. The fibrous material for anti-slip is provided randomly and with a nonuniform fiber diameter.

  Hereinafter, the present invention will be described in detail based on examples. However, the following examples are not intended to limit the present invention, and all modifications made without departing from the spirit of the preceding and following descriptions are included in the technical scope of the present invention. The measurement method used in the present invention is as follows.

<Fiber diameter>
Using a capping sheet sample of width 100 cm x length 50 cm, taking a scanning microscope surface photograph (10 cm x 10 cm) at a magnification of 20 times in a 5 mm square field of view of dividing the width into 6 equal parts, The diagonal line connecting the lower left and upper right was drawn to measure the fiber diameter of the fiber intersecting the diagonal (the length of the diagonal line overlapping the fiber), and the minimum fiber diameter and the maximum fiber diameter in each of the five fields of view were examined. . When a plurality of fibers are overlapped to form a thick fiber, the fiber diameter of the thickest fiber is adopted. When the boundary is not clear, it is assumed that all the fibers are combined.

<Ratio of minimum fiber diameter and maximum fiber diameter>
The ratio of the minimum fiber diameter and the maximum fiber diameter in each field of view according to the fiber diameter measurement method is obtained, and an average value of five locations is adopted.
<Sheet weight>
Measured according to JIS L 1906.

<Weight of anti-slip fibrous material>
The difference in the mass of the capping sheet before and after forming the anti-slip fibrous material is taken as the mass of the formed anti-slip fibrous material, and is measured in accordance with the provisions of JIS L 1906.

<Heat shrinkage>
Measured according to JIS L 1906. A 15 cm square sample is cut out, placed in an oven at 80 ° C. for 10 minutes, and the rate of change in length of the vertical and horizontal sides is measured, and the average value is adopted.

<Elongation at break>
Measured according to JIS L 1906.
<Tear strength>
Measured in accordance with JIS K 7128 1 method.
<Shading rate>
Measured according to JIS L 1055 A method.
<Penetration resistance>
Measured according to ASTM D-4833.
<Moisture permeability>
Measured according to JIS L 1099 A-1 method.

<Water resistance level>
Measured in accordance with JIS L 1092 water resistance test A method. Cut the sample into a circle that is slightly larger than the fixed holder, attach the end to molten paraffin, seal the end of the sheet, apply a silicone sealant where there is a gap, solidify, then set it in the holder, Measure the water head when water droplets are lifted up visually. n = 5 points are measured, and the lowest value is adopted.

<Friction angle>
Measured by the tilt method in accordance with the provisions of the JSP P 8147 method. Yamatomi Manufacturing Co., Ltd. soil is put into a mold, tightened with a hammer and hardened so that the packing density is about 1.8 g / cm ³ . On top of that, a sample cut out to 7.5 cm × 14.0 cm from the capping sheet for covering waste is pasted to the lower surface of the metal plate so that a load of 5.25 kg is applied to a load of 50 g / cm ^2. Scented. One side is lifted so that the inclination angle gradually increases in the longitudinal direction of the sample, and the angle from the horizontal plane when the metal plate with the sheet attached starts to move is measured. The measurement is performed five times, and the intermediate value (median) among the three points from which the Max and Mix values are removed is defined as the friction angle.

<Slip resistance evaluation>
A 1m square capping sheet for waste covering of the present invention is attached to a panel board inclined at 37.5 ° with double-sided tape so that the anti-slip fibrous material side becomes the upper surface, and the soil for building is placed on the surface. Mount with a scoop and evaluate the slip resistance of the capping sheet for waste coating. The evaluation criteria are as follows.
○: Soil was hardly slipped and a 30 cm thick soil layer could be formed.
Δ: Sediment was slightly slipped, but was hardly slipped, and a 30 cm thick soil layer could be formed.
X: The earth and sand slipped until it accumulated on the bottom, and it was difficult to form a soil layer.

<Damage due to heat when applying hot melt adhesive>
The damage by the heat | fever at the time of apply | coating a hot-melt-adhesive to the waterproof moisture-permeable sheet | seat which comprises the capping sheet for waste covering of this invention was examined. Also, the heat resistance of the capping sheet for waste coating has not changed due to the heat, or water pressure of about 5 cm under water is applied from above the capping sheet for waste coating of the present invention, and water penetration from the pinhole The presence or absence was checked. The evaluation criteria are as follows.
○: The waterproof and moisture-permeable sheet was not particularly damaged, and the waterproof property of the capping sheet for covering waste was not changed.
X: The waterproof and moisture-permeable sheet was partially transparentized due to damage.

<Joint strength>
Measured according to JIS L 1906. Set the joint so that it is in the middle of the upper and lower fixed chucks. n = 5 points are measured, and the lowest value is adopted.

Example 1
As the first fiber sheet, a polyester partially heat-bonded long-fiber nonwoven fabric colored in black (heat embossing treatment 3A31AD manufactured by Toyobo Co., Ltd .: basis weight 130 g / m ² , thickness 0.5 mm, light shielding rate 99.8% Above). On the lower surface of the first fiber sheet, a waterproof and moisture permeable film made of polyethylene by an inflation method as a waterproof and moisture permeable sheet ("Porum (registered trademark)" high weather resistance and high elongation type manufactured by Tokuyama Corporation: basis weight 100g / m ² , thickness 100 μm, elongation at break 530%, tear strength 2.1N, average value of longitudinal and transverse heat shrinkage at 80 ° C. 16%). The first fiber sheet and the waterproof and moisture-permeable sheet were laminated and integrated with an acrylic pressure-sensitive adhesive (Sydenol (registered trademark) TC-K3 resin manufactured by Saiden Chemical Co., Ltd.). From a height of about 8 cm from the first fiber sheet, an ethylene copolymer hot melt adhesive (about a solid paraffin component is melted from a nozzle having a diameter of 0.4 mm by a spiral jet type adhesive applicator manufactured by Nordson Corporation. 30 wt%) (the peak temperature of the differential calorimeter DSC is about 70 ° C.) is discharged at 2 g / min. The nozzle is moved in both the width direction and the longitudinal direction of the first fiber sheet while colliding a swirling air flow of about 0.2 kgf / cm ² sprayed from a hole of Φ1 mm with the discharged hot melt adhesive. Thus, a non-slip fibrous material having a variation in fiber diameter was formed on the upper surface of the first fiber sheet almost uniformly over the entire surface, and a capping sheet 1 for covering waste was produced. For the anti-slip fibrous material, the maximum fiber diameter, the minimum fiber diameter, the ratio between the minimum fiber diameter and the maximum fiber diameter, and the basis weight were measured, and the results are shown in Table 1. About the capping sheet 1 for waste covering, the friction angle on the surface is measured, and the damage of the waterproof and moisture-permeable sheet due to heat when applying the soil-resisting property and the hot melt adhesive is evaluated, and the results are shown in Table 1. .

Example 2
A non-slip fibrous material is formed in the same manner as in Example 1 except that the pressure of the swirling air flow colliding with the discharged hot melt adhesive is set to about 0.3 kgf / cm ² , and capping for waste coating is performed. Sheet 2 was produced. The anti-slip fibrous material and waste capping sheet 2 were measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

Example 3
Using the waste coating capping sheet 1 produced in Example 1, a polyester needle punched nonwoven fabric (500 g weight per unit area) is used as a second fiber sheet on the lower surface (opposite side of the first fiber sheet) of the waterproof and moisture permeable sheet. / M ² , thickness 5 mm) is laminated and integrated with an acrylic pressure-sensitive adhesive (Sydenol (registered trademark) TC-K3 resin manufactured by Seiden Chemical Co., Ltd.). Two obtained laminates were used and joined by a ryster (processing air temperature 280 ° C., processing speed about 2.2 m / min) while providing an overlapping portion (width 10 cm), and a capping sheet 3 for covering waste was prepared. Produced. With respect to the capping sheet 3 for covering waste, the minimum water resistance level and the minimum bonding strength of the bonded portion were measured. The results are shown in Table 1.

Comparative Example 1
A capping sheet 4 for covering waste was prepared in the same manner as in Example 1 except that the anti-slip fibrous material was not formed on the upper surface of the first fiber sheet. The capping sheet 4 for covering waste was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 2
The anti-slip fibrous material was formed in the same manner as in Example 1 except that the swirling air flow was not collided with the discharged hot melt adhesive and the anti-slip fibrous material was formed by gravity drop. A capping sheet 5 was produced. The anti-slip fibrous material and waste capping sheet 5 were measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 3
Similar to Example 1 except that the pressure of the swirling air flow colliding with the discharged hot melt adhesive was set to about 0.3 kgf / cm ² and the basis weight of the anti-slip fibrous material was set to 10 g / m ^2. An anti-slip fibrous material was formed, and a capping sheet 6 for covering waste was produced. The anti-slip fibrous material and the waste coating capping sheet 6 were measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 4
Using the capping sheet 4 for covering waste produced in Comparative Example 1, a needle punched nonwoven fabric made of polyester (500 g basis weight) is used as the second fiber sheet on the lower surface (opposite side of the first fiber sheet) of the waterproof and moisture-permeable sheet. / M ² , thickness 5 mm) is laminated and integrated with an acrylic pressure-sensitive adhesive (Sydenol (registered trademark) TC-K3 resin manufactured by Seiden Chemical Co., Ltd.). Two obtained laminates were used and joined by a ryster (processing air temperature 290 ° C., processing speed about 1.0 m / min) while providing an overlapping portion (width 10 cm), and a capping sheet 7 for covering waste was attached. Produced. With respect to the capping sheet 7 for covering waste, the minimum water resistance level and the minimum bonding strength of the joint were measured in the same manner as in Example 3. The results are shown in Table 1.

Comparative Example 5
Using the capping sheet 4 for covering waste produced in Comparative Example 1, a needle punched nonwoven fabric made of polyester (500 g basis weight) is used as the second fiber sheet on the lower surface (opposite side of the first fiber sheet) of the waterproof and moisture-permeable sheet. / M ² , thickness 5 mm) was laminated and integrated with an acrylic pressure-sensitive adhesive (Sydenol (registered trademark) TC-K3 resin manufactured by Seiden Chemical Co., Ltd.). Two obtained laminates were used and joined by a ryster (processing air temperature: 275 ° C., processing speed: about 2.5 m / min) while providing an overlapping portion (width 10 cm), and a capping sheet 8 for covering waste was attached. Produced. With respect to the capping sheet 8 for covering waste, the minimum water resistance level and the minimum bonding strength of the joint were measured in the same manner as in Example 3. The results are shown in Table 1.

  It was found that the capping sheets for covering wastes of Examples 1 to 3 have a large friction angle and excellent anti-slip properties.

  In the capping sheets for covering wastes of Comparative Examples 1, 4 and 5, since the anti-slip fibrous material was not provided on the surface of the first fiber sheet, the friction angle was small and the anti-slip property was low.

  In the capping sheet for covering waste of Comparative Example 2, the minimum fiber diameter of the anti-slip fibrous material provided on the surface of the first fiber sheet is more than 50% of the maximum fiber diameter, so the friction angle is small, Anti-slip property was low.

In the capping sheet for waste covering of Comparative Example 3, the basis weight of the anti-slip fibrous material provided on the surface of the first fiber sheet was less than 15 g / m ² , so the friction angle was small and the anti-slip property was low. I understood that.

  In addition, the capping sheet for waste covering of Example 3 is formed by laminating and integrating the second fiber sheet with the capping sheet for waste covering of Example 1 using a lyister. . The capping sheet for waste coating of Example 3 is used as a sealant because the fibrous material provided on the surface of the first fiber sheet melts faster than the first fiber sheet by thermal fusion bonding. Even if the processing conditions of the leister fluctuated due to temperature and wind, the water resistance and the bonding strength were good at the joint.

  The capping sheets for covering wastes of Comparative Examples 4 and 5 are formed by laminating and integrating the second fiber sheet using the capping sheet for covering wastes of Comparative Example 1 with a lyster. . Since the capping sheet for covering wastes of Comparative Examples 4 and 5 is not provided with a non-slip fibrous material on the surface of the first fiber sheet, a high heat-sealing temperature is required if the bonding strength is ensured. Therefore, the water resistance of the joint becomes weak (Comparative Example 4), or if the water resistance of the joint is secured, the joint strength is poor (Comparative Example 5). In addition, a material satisfying the joint strength was not obtained.

It is sectional explanatory drawing of the capping sheet for waste covering of this invention. It is a photograph of the fibrous material for slip prevention provided in the surface of the capping sheet for waste covering of this invention. It is a SEM surface photograph of the fibrous material for slip prevention provided in the surface of the capping sheet for waste covering of this invention.

Explanation of symbols

  1: first fiber sheet, 2: waterproof and moisture-permeable sheet, 3: second fiber sheet, 4: anti-slip fibrous material, 10: capping sheet for waste coating

Claims (10)

A waste coating capping sheet having a laminated structure of at least two layers comprising a first fiber sheet and a waterproof and moisture permeable sheet,
On the surface of the first fiber sheet, an anti-slip fibrous material comprising a hot melt adhesive is provided,
Characterized in that said anti-slip for the fibrous material is basis weight is the ^{15g / m 2 ~100g / m 2} , and the maximum fiber diameter is 0.1mm or more, the minimum fiber diameter is less than 50% of the maximum fiber diameter Capping sheet for waste coating.   The capping sheet for covering waste further includes a second fiber sheet laminated on the waterproof and moisture-permeable sheet, and the second fiber sheet is disposed on the opposite side of the first fiber sheet. 2. A capping sheet for covering wastes according to 1.   The capping sheet for waste covering according to claim 1 or 2, wherein the anti-slip fibrous material is provided randomly and with a non-uniform fiber diameter.   The said hot-melt-adhesive consists of at least 1 sort (s) of resin selected from the group which consists of polyolefin resin, polyester-type resin, and polyamide resin, The object for waste coating | cover as described in any one of Claims 1-3 Capping sheet.   The said hot-melt-adhesive is a capping sheet for waste covering as described in any one of Claims 1-4 whose melting | fusing point is 30 degreeC or more lower than the fiber which comprises the said 1st fiber sheet. The first fiber sheet is a light blocking ratio of 90% or more, capping sheet for waste coating according to any one of claims 1 to 5 basis weight is ^{70g / m 2 ~300g / m 2} . The thickness of the second fiber sheet is 0.2 mm to 10.0 mm, the basis weight is 50 g / m ^{2 to} 1000 g / m ² , and the penetration resistance is 200 N or more. Capping sheet for waste coating. The capping sheet for waste coating according to any one of claims 1 to 7, wherein the anti-slip fibrous material has a maximum fiber diameter of 3 mm or less. A method for producing a capping sheet for waste covering according to any one of claims 1-8,
While discharging a hot melt adhesive melted from a nozzle from a predetermined height on the first fiber sheet with a spiral jet type hot melt adhesive applicator, a swirling air flow is collided with the discharged hot melt adhesive , Including the step of forming the anti-slip fibrous material on the surface of the first fiber sheet by moving the nozzle in both the width direction and the longitudinal direction of the first fiber sheet. Capping sheet manufacturing method. The height of the nozzle from the first fiber sheet is 3 to 30 cm, the nozzle diameter is 0.2 to 1.5 mm, the hot melt adhesive discharge speed is 1 to 3 g / min, and the swirling air flow pressure is 0. .1kgf / cm ² ~ 2.0kgf / cm ² The manufacturing method according to claim 9.