JP6540197B2 - Laminated sheet and joining method of laminated sheet - Google Patents

Description

  The present invention relates to a laminated sheet having moisture permeability and waterproofness used in disposing of waste, and more particularly to a technique for bonding without impairing the moisture permeability and waterproofness.

  2. Description of the Related Art Conventionally, at a waste disposal site, at the time of landfill disposal of waste, capping is performed to cover the landfill area with a water shielding sheet (capping sheet) in order to prevent the infiltration of rain water and the like.

  In recent years, it is also possible to temporarily cover these wastes with capping sheets to prevent the infiltration of rainwater etc. when it is difficult to immediately transfer illegally dumped wastes to a well-equipped disposal site. It has been done. Since waste from illegal dumping sites must eventually be transported to a disposal site, when capping these wastes, the capping sheet surface is often not covered with soil. Therefore, the capping sheet is required to have weatherability superior to the conventional one.

  In general, the capping sheet is made of a non-breathable material such as synthetic rubber, polyvinyl chloride and polyethylene. However, when a non-air-permeable capping sheet is used, there is a problem that the capping sheet is easily broken because gas or water vapor generated from waste is confined in the space covered by the capping sheet.

Therefore, Patent Document 1 discloses a moisture-permeable and waterproof capping sheet that is waterproof and yet has breathability. In the moisture-permeable and waterproof capping sheet of Patent Document 1, a light-shielding fiber sheet is laminated on the surface side of a resin sheet (claim 1, paragraph 0009, etc.).
In addition, the capping sheet is formed by bonding a rectangular fabric in a factory or a field according to the size of the coated area.

JP 2005-81222 A

  The moisture-permeable and waterproof capping sheet is a laminate sheet having a moisture-permeable and waterproofing structure having a laminated structure of a resin sheet having moisture-permeable waterproofness and a light-shielding fiber sheet having light-shielding and not waterproofing. When such laminated sheets are simply stacked and joined or joined using a fiber tape as in Patent Document 1 (paragraph 0050, FIG. 1), the resin sheets do not directly contact each other, so the resin sheet There is a problem that a path where water leaks through the light-shielding fiber sheet sandwiched between them remains and the waterproofness is lowered, and the strength of the joint is low and the joint is easily peeled off.

  The present invention has been made in consideration of the above problems, and bonding can be performed without impairing the waterproofness, the strength of the bonding portion is high, and the bonding portion can be hardly peeled off, and An object of the present invention is to provide a waterproof laminated sheet and a method of joining the laminated sheet.

As a result of earnest research in order to solve the above-mentioned problems, the inventors finally accomplished the present invention. That is, the present invention is as follows.
(1) A sheet body in which a non-woven fabric made of polyethylene terephthalate fibers is laminated on both sides of a moisture-permeable waterproof sheet,
A laminated sheet comprising: a material constituting the moisture-permeable waterproof sheet; and a heat fusion film containing a low melting material having a melting point lower than that of the polyethylene terephthalate,
At least one side of the non-woven fabric made of polyethylene terephthalate fiber is a non-woven fabric subjected to mechanical entanglement treatment,
At least one side of the sheet body, at least one side of the moisture-permeable waterproof sheet has an exposed surface on which the non-woven fabric made of polyethylene terephthalate fibers does not exist, and the heat fusion film is present on the exposed surface of the moisture-permeable waterproof sheet.
The heat fusible film is present on at least one side of the non-woven fabric made of polyethylene terephthalate fiber at the one side of the sheet main body, and the heat fusible film or the moisture-permeable film is made on the side of the non-woven fabric made of polyethylene terephthalate fiber A laminated sheet characterized by the presence of a waterproof sheet.
(2) The thickness of at least one end of the laminated sheet in the short side direction from the end to the range of 5 cm is 4/5 or less of the thickness of the central part in the short side direction (1 The laminated sheet described in 2.).
(3) The laminated sheet according to (1) or (2), wherein the nonwoven fabric made of polyethylene terephthalate fiber is a nonwoven fabric on which at least one side is subjected to a binder treatment.
(4) The sheet body is rectangular,
The laminated sheet according to any one of (1) to (3), wherein the heat fusion film is present on both long sides of the sheet main body.
(5) The first heat fusion film laminated on the upper part of the sheet main body and the second heat fusion film laminated on the lower part of the sheet main body are directly bonded at the side part of the sheet main body The lamination sheet in any one of (1) to (4).
(6) The laminated sheet according to (5), in which the portion where the first heat fusion film and the second heat fusion film are directly bonded to each other is 3 mm or more.
(7) The heat fusion film is
The laminated sheet according to any one of (1) to (6), wherein one heat-fusion film is bent and attached to the upper, lower, and side portions of the sheet body.
(8) The low melting point substance is
The lamination sheet in any one of (1)-(7) whose melting | fusing point is 150 degrees C or less.
(9) The heat fusion film is
A low melting point material layer comprising the low melting point material;
The laminated sheet in any one of (1)-(8) which is a laminated structure with the high melting point substance layer which consists of a high melting point substance whose melting | fusing point is higher than the said low melting point substance.
(10) The high melting point substance is
The laminated sheet as described in (9) whose melting | fusing point is 160 degreeC or more.
(11) The heat fusion film is
The laminated sheet according to (9) or (10), wherein the low melting point material layer is laminated on both sides of the high melting point material layer.
(12) In any one of (1) to (11), the heat fusible film is present in the region of 50 to 500 mm from the side surface of the non-woven fabric composed of the polyethylene terephthalate fibers in the upper and lower portions of the sheet body. Description laminated sheet.
(13) The sheet body is
The lamination sheet in any one of (1)-(12) in which the nonwoven fabric which consists of said polyethylene terephthalate fiber is laminated | stacked on both surfaces of the said moisture-permeable waterproof sheet.
(14) Two or more laminated sheets according to any one of (1) to (13) are prepared, and the heat-fusion film of the first lamination sheet and the heat-fusion film of the second lamination sheet are superposed on each other Process,
A method of joining laminated sheets, comprising: a joining step of heating the first laminated sheet and the second laminated sheet by heat-welding the portions superposed in the joining step.
(15) A method for joining laminated sheets, which includes laminated sheets including a sheet body in which a moisture-permeable waterproof sheet and a non-woven fabric made of polyethylene terephthalate fibers are laminated,
One side of the first sheet body and one side of the second sheet body
A heat-fusion film comprising the moisture-permeable waterproof sheet and a low melting material having a melting point lower than that of the polyethylene terephthalate,
An exposed surface where the non-woven fabric made of the polyethylene terephthalate fiber is not present on at least one side of the moisture-permeable waterproof sheet, and at least one surface of the non-woven fabric made of the polyethylene terephthalate fiber,
As the heat fusible film or the moisture-permeable waterproof sheet is present on the side surface of the non-woven fabric made of the polyethylene terephthalate fiber,
An aligning step of overlapping one side of the first sheet body and one side of the second sheet body;
And a bonding step of heating the first sheet body and the second sheet body by heat-fusing the portions overlapped in the bonding step to thermally bond the first sheet body and the second sheet body.
(16) The heat fusion film is
A low melting point material layer comprising the low melting point material;
The method for bonding a laminated sheet according to (15), which is a laminated structure with a high melting point substance layer composed of a high melting point substance having a melting point higher than that of the low melting point substance.

  The laminate sheet according to the present invention joins the first laminate sheet and the second laminate sheet only by overlapping the heat fusion film of the first laminate sheet and the heat fusion film of the second laminate sheet and heating them. Work is simple and easy, and its workability is good. Furthermore, the laminated sheet has an exposed surface on which at least one side of the sheet body does not have a non-woven fabric made of polyethylene terephthalate fibers on at least one surface of the moisture-permeable waterproof sheet, and a heat fusion film is present on the exposed surface. A junction area between the moisture-permeable waterproof sheet and the heat-fusion film can be secured, as a result, there is no path of leakage of water between the moisture-permeable waterproof sheet and the heat-fusion film, and the waterproofness is impaired. The joint portion can be strengthened by arranging a non-woven fabric made of polyethylene terephthalate fibers on both sides and using a non-woven fabric in which at least one side of the non-woven fabric made of polyethylene terephthalate fibers is mechanically entangled.

It is an outline view of a lamination sheet concerning the present invention. It is the elements on larger scale of the cross section in dashed-dotted line S-S in FIG. FIGS. 3A and 3B are partially enlarged views of a cross section showing a modification of the sheet main body. Fig.4 (a)-(c) is the elements on larger scale of the cross section which shows the modification of a heat sealing | fusion film. It is a sectional view of a heat fusion film. FIGS. 6 (a) and 6 (b) are partially enlarged views of a cross section schematically showing a method of joining laminated sheets according to the present invention.

  As described above, the laminated sheet described in Patent Document 1 has a problem that the water leaks through the light-shielding fiber sheet between the resin sheets and the waterproofness is reduced. In order to solve such problems, the inventors of the present invention have a moisture-permeable waterproof property having a laminated structure of a resin sheet having moisture-permeable waterproofness and a light-shielding fiber sheet having light-shielding performance and no waterproofness. It is found that the heat fusible film is present on the upper surface, the lower surface, and the side of the sheet main body in the laminated sheet provided, so that the side of the polyester non-woven fabric is not exposed and the water leakage does not remain and the waterproofness is not impaired. And the laminated sheet has already been filed (Japanese Patent Application No. 2013-222701).

  However, since the moisture-permeable waterproof sheet is very thin, the side surface of the moisture-permeable waterproof sheet and the bonding area of the heat fusible film are extremely small, and by using the sheet, the side of the moisture-permeable waterproof sheet and the heat fusible film There was a gap in between, and water could leak from the gap.

  As a result of intensive studies to solve such problems, the present inventors have conducted an exposed surface on which at least one side of the laminated sheet main body has a non-woven fabric made of polyethylene terephthalate fiber on at least one side of the moisture-permeable waterproof sheet. By providing the heat fusible film on the exposed surface, it is possible to secure a bonding area between the moisture permeable waterproof sheet and the heat fusible film, and as a result, between the moisture permeable waterproof sheet and the heat fusible film It has been found that there is no path for water to leak, and there is no loss of waterproofness. Furthermore, it has been found that the nonwoven fabric made of polyethylene terephthalate fibers is disposed on both sides, and furthermore, by using a nonwoven fabric in which at least one side of the nonwoven fabric made of polyethylene terephthalate fibers is mechanically entangled, it becomes strong after bonding. .

  Hereinafter, the present invention will be described in detail.

  The laminated sheet according to the present invention comprises a sheet body in which a moisture-permeable waterproof sheet and a nonwoven fabric made of polyethylene terephthalate fibers on both sides are laminated, a material constituting the moisture-permeable waterproof sheet, and a low melting point material having a melting point lower than that of the polyethylene terephthalate. And at least one side of the non-woven fabric made of the polyethylene terephthalate fiber is a non-woven fabric subjected to mechanical entanglement, and the moisture-permeable waterproof sheet at least one side of the sheet main body. The heat-fusion film is present on the exposed surface of the moisture-permeable waterproof sheet, and the polyethylene terephthalate fiber is provided on the one side of the sheet body At least one piece of non-woven fabric The heat-fusible film is present and, on the side of the nonwoven fabric of the polyethylene terephthalate fiber the heat-fusible film or the moisture-permeable waterproof sheet is present.

  The laminate sheet according to the present invention joins the first laminate sheet and the second laminate sheet only by overlapping the heat fusion film of the first laminate sheet and the heat fusion film of the second laminate sheet and heating them. Work is simple and easy, and its workability is good.

  Furthermore, the laminated sheet has an exposed surface on which at least one side of the sheet body does not have a non-woven fabric made of polyethylene terephthalate fibers on at least one surface of the moisture-permeable waterproof sheet, and a heat fusion film is present on the exposed surface. A junction area between the moisture-permeable waterproof sheet and the heat-fusion film can be secured, as a result, there is no path of leakage of water between the moisture-permeable waterproof sheet and the heat-fusion film, and the waterproofness is impaired. There is no

  FIG. 1 is an external view of a laminated sheet according to the present invention. The laminated sheet 1 shown in FIG. 1 is a long fabric with the X direction in FIG. 1 as the short side (for example 2 m) and the Y direction in FIG. 1 as the long side (for example 100 m). A heat-sealable film 12 is laminated and integrated in the Z direction in FIG. 1. At one side where the heat fusible film 12 is laminated, the moisture-permeable waterproof sheet 10 has an exposed surface 10d where no nonwoven fabric made of polyethylene terephthalate fibers is present, and the heat fusible film 12 is present on the exposed surface 10d. ing. Further, on one side, the heat fusible film 12 is present on both sides of the non-woven fabric 11 made of polyethylene terephthalate fiber, and the heat fusible film 12 is present on the side of the non-woven fabric 11 made of polyethylene terephthalate fiber.

  In the nonwoven fabric made of polyethylene terephthalate fibers disposed on both sides of the moisture-permeable waterproof sheet of the present invention, the nonwoven fabric on at least one side is subjected to mechanical entanglement treatment. Therefore, the mechanical strength required when using the laminated sheet of the present invention as a capping sheet for waste coating can be secured.

In the laminated sheet of the present invention, at least one end in the short side direction of the laminated sheet has a thickness ranging from 5 cm from the end to 4/5 or less the thickness of the central part in the short side direction It is. Therefore, the apparent density of the end portions in the short side direction is increased, and it is reinforced by being integrated at the time of bonding, and it is possible to secure mechanical strength necessary as a capping sheet for waste coating.
In addition, as a method of making the thickness within 5 cm from the end in the short side direction of the laminated sheet to 4/5 or less with respect to the thickness of the center in the short side direction, A method of reducing the thickness and a method of reducing the thickness by thermocompression bonding of the end portions of the laminated sheet may be used.
In addition, if at least one end in the short side direction of the laminated sheet has a thickness ranging from 5 cm to the end with respect to the thickness of the central part in the short side direction, the end is 4/5 or less. The thickness in the range exceeding 5 cm from the part may be 4/5 or less. Furthermore, not only the thickness may be reduced continuously from the end in the short side direction, but also the thickness may be intermittently reduced.

  The non-woven fabric made of polyethylene terephthalate fiber is preferably one having a binder treatment on at least one side. The non-woven fabric treated with the binder has a high apparent density, and is reinforced by being integrated at the time of bonding, and the mechanical strength necessary as a capping sheet for waste coating can be secured.

  In a factory or site, a plurality of rectangles are cut out from the laminated sheet 1 and the long sides of the rectangles are joined according to the method described later to obtain a size (for example, a rectangle of 10 m × 25 m) matching the size of the coated area A capping sheet can be formed. By laminating the non-woven fabric 11 made of polyethylene terephthalate fiber on the moisture-permeable waterproof sheet 10, the light shielding property is obtained, the weather resistance is good, the ultraviolet ray deterioration of the moisture-permeable waterproof sheet 10 is suppressed, and a capping sheet for covering wastes Necessary mechanical strength can be secured.

  Hereinafter, the part except the heat-fusion film 12 in which the moisture-permeable waterproof sheet 10 and the nonwoven fabric 11 made of polyethylene terephthalate fiber are laminated is referred to as a sheet main body 2. The sheet main body 2 may have a three-layer structure or more including at least one moisture-permeable waterproof sheet 10 and a non-woven fabric 11 made of polyethylene terephthalate fibers disposed on both sides thereof. For example, as shown in FIG. 1, it is preferable that it is a 3 layer structure by which the nonwoven fabric 11 which consists of a polyethylene terephthalate fiber is laminated | stacked one each on both surfaces of the moisture-permeable waterproof sheet 10 of 1 sheet. When the sheet body 2 has a three-layer structure or more, the non-woven fabric 11 a made of the first polyethylene terephthalate fiber is laminated on the surface side (the opposite side of waste) of the moisture-permeable waterproof sheet 10. The nonwoven fabric 11b which consists of a 2nd polyethylene terephthalate fiber shall be laminated | stacked on the side (waste side).

  FIG. 2 is a partially enlarged view of a cross section taken along dashed-dotted line S-S in FIG. On one side A of the sheet body 2, the heat fusible film 12 is the exposed surface 10d of the moisture-permeable waterproof sheet 10, the surface (opposite side of the waste) and the side of the nonwoven fabric 11a made of the first polyethylene terephthalate fiber, the second polyethylene terephthalate It exists in the back (waste side) and the side of nonwoven fabric 11b which consists of textiles. At one side A of the sheet body 2, exposed surfaces 10 d are provided on both sides of the moisture-permeable and waterproof sheet 10. It is sufficient that the exposed surface 10d be provided on at least one side of the moisture-permeable waterproof sheet 10, and it is preferable that the exposed surface 10d be provided on both sides.

  The heat sealing film 12 is present on the exposed surface 10 d of the moisture-permeable waterproof sheet 10. The presence of the heat-fusion film 12 on the exposed surface 10 d prevents water from leaking between the moisture-permeable waterproof sheet 10 and the heat-fusion film 12. The width in the horizontal direction of the exposed surface 10d may be any width that allows the moisture-permeable waterproof sheet 10 and the heat-sealing film 12 to be joined. When the width in the horizontal direction of the exposed surface 10d is 10 mm or more, the bonding area of the moisture-permeable waterproof sheet 10 and the heat-fusion film 12 can be sufficiently secured. When the horizontal width of the exposed surface 10d exceeds 100 mm, it is economically and practically disadvantageous. Therefore, the width in the horizontal direction of the exposed surface 10d is preferably 10 to 100 mm, more preferably 20 to 70 mm.

  At one side A of the sheet main body 2, the heat fusible film 12 is present on the side surface of the non-woven fabric 11 made of polyethylene terephthalate fiber. As described later, the moisture-permeable waterproof sheet 10 can also be present on the side surface of the non-woven fabric 11 made of polyethylene terephthalate fiber.

  The heat fusible film 12 is a side surface of the non-woven fabric 11 made of polyethylene terephthalate fiber on the surface of the non-woven fabric 11a made of the first polyethylene terephthalate fiber and the back surface of the non-woven fabric 11b made of the second polyethylene terephthalate fiber. 1) It exists in a 50 to 500 mm region from the nonwoven fabric 11a made of polyethylene terephthalate fiber or the side surface of the nonwoven fabric 11b made of second polyethylene terephthalate fiber. When the heat fusible film 12 is present in a region of 50 mm or more from the side surface of the non-woven fabric 11 made of the polyethylene terephthalate fiber, sufficient waterproofness can be maintained. Moreover, if it exists in the area | region over 500 mm, it will be economically and practically disadvantageous, and the area | region of moisture permeability will become narrow. The exposed surface 10 d of the moisture-permeable waterproof sheet 10 and the heat sealing film 12 may be present on at least one side of the sheet main body 2. In addition, the sheet main body 2 is made rectangular so that the laminated sheet 1 can be joined to a plurality of sheets, and the exposed surface 10 d of the moisture-permeable waterproof sheet 10 and the heat fusible film 12 exist on both long sides of the sheet main body 2 Is preferred.

  In addition, as shown in FIG. 2, a first heat-fusion film 12a laminated on the surface of the nonwoven fabric 11a made of the first polyethylene terephthalate fiber and a second heat laminated on the back surface of the nonwoven fabric 11b made of the second polyethylene terephthalate fiber. The fusion film 12 b is directly laminated on the side portion B of the sheet main body 2 to form a laminated portion 12 c. Here, the mating portion 12c may be protruded in the horizontal direction from the sheet main body 2, but 1 mm or more is preferable, and 3 mm or more is more preferable. If the mating portion 12c is not 1 mm or more, bonding may be weak and waterproof may be impaired, and if it is 3 mm or more, sufficient bonding can be performed. Moreover, it is preferable that the mating part 12c does not exceed 10 mm so as not to be in the way at the time of operation or the like.

  FIGS. 3A and 3B are partially enlarged views of a cross section showing a modification of the sheet main body 2.

  In FIG. 3A, on one side A of the sheet main body 2, the exposed surface 10d is present only on the surface side of the moisture-permeable waterproof sheet 10. The heat fusible film 12 is composed of an exposed surface 10d of the moisture-permeable waterproof sheet 10, a surface and a side surface of a non-woven fabric 11a made of a first polyethylene terephthalate fiber, and a non-woven fabric 11b made of a second polyethylene terephthalate fiber. Exist on the back and sides. As described above, if the exposed surface 10d is provided on at least one side of the moisture-permeable waterproof sheet 10, and the heat fusible film 12 exists on the exposed surface 10d, water can flow from between the moisture-permeable waterproof sheet 10 and the heat fusible film 12 Waterproofness can be maintained without leaking.

  In FIG. 3B, the moisture-permeable waterproof sheet 10 is bent at one side A of the sheet main body 2, and the moisture-permeable waterproof sheet 10 is present at the side portion B and the upper portion C of the sheet main body 2. The exposed surface 10 d of the moisture-permeable waterproof sheet 10 is also present on the side portion B and the upper portion C of the sheet body 2. A moisture permeable waterproof sheet 10 is present on the side surface of the non-woven fabric 11 a made of polyethylene terephthalate fiber. As described above, even if the heat fusible film 12 is not present on the side surface of the nonwoven fabric 11a made of polyethylene terephthalate fiber, the heat fusible film 12 is present on the exposed surface 10d. Waterproofness can be maintained without leakage of water from between the films 12.

  Fig.4 (a)-(c) is the elements on larger scale of the cross section which shows the modification of a heat sealing | fusion film. As shown in FIGS. 4A to 4C, one heat fusion film 12 is bent and attached to the side portion B of the sheet main body 2, the upper portion C of the sheet main body 2, and the lower portion D of the sheet main body 2. It may be attached.

The moisture permeable waterproof sheet 10 is a resin sheet having both moisture permeability and waterproofness. From the viewpoint of securing waterproofness (water permeation), the moisture permeability waterproof sheet 10 preferably has a water level of 1000 mm or more, more preferably 2000 mm or more, measured according to the water resistance test A method of JIS_L_1092. And 5000 mm or more. Further, the moisture permeable waterproof sheet 10 preferably has a moisture permeability of 1000 g / m ² · 24 hr or more, preferably 5000 g / m ² · 24 hr or more, as measured in accordance with the JIS_L_1099_A-1 method, from the viewpoint of securing moisture permeability. It is further preferred that

  It is recommended that the moisture-permeable waterproof sheet 10 be a porous sheet from the viewpoint of securing moisture permeability. The porous sheet is manufactured, for example, by an inflation method in which fine particles are formed by mixing a resin such as polyethylene with inorganic fine particles such as calcium carbonate to form a sheet, and stretching the sheet.

  In particular, it is preferable to use a porous sheet manufactured by the inflation method as the moisture-permeable waterproof sheet 10. Empirically, since the porous sheet produced by the inflation method has good adhesion with the non-woven fabric 11 made of polyethylene terephthalate fiber, the waterproofness of the sheet body 2 is improved.

  The material of the moisture-permeable waterproof sheet 10 is not particularly limited, but preferred examples thereof include polyolefin resins such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer (EVA), and fluorine resins such as polytetrafluoroethylene and polyvinylidene fluoride. Particularly preferred is low density polyethylene.

  Examples of the porous sheet made of the low density polyethylene material as described above and manufactured by the inflation method include, for example, “Microtex” manufactured by Nitto Denko Corporation, “Tetratex” manufactured by Donaldson Corporation, etc. The following commercial products can be used, and it is also possible to use a flash spun nonwoven fabric or an SMS nonwoven fabric using ultrafine fibers.

  The moisture-permeable waterproof sheet 10 preferably has an appropriate elongation at break and tear strength in order to prevent breakage from occurring due to an external force during laying and to prevent breakage from occurring in the joint portion.

  The moisture-permeable waterproof sheet 10 preferably has a breaking elongation of 250% or more, more preferably 300% or more, and still more preferably 400% or more, which is measured according to the definition of JIS_L_1906.

  The moisture-permeable waterproof sheet 10 preferably has a tear strength of 0.75 N or more, more preferably 1.0 N or more, and still more preferably 2.0 N or more, which is measured according to the definition of the JIS_K_7128_1 method.

  The elongation at break of the moisture-permeable waterproof sheet 10 is preferably 250% or more, more preferably 300% or more, and still more preferably 400% or more. Alternatively, the tear strength is preferably 0.75 N or more, more preferably 1.0 N or more, and still more preferably 2.0 N or more. Since the breaking elongation rate or the tearing strength is less likely to be damaged by an external force during laying and is less likely to be broken at the joint portion, high waterproofness can be maintained.

  The thickness of the moisture-permeable waterproof sheet 10 is not particularly limited, but is preferably 50 μm or more, more preferably 80 μm or more, and 200 μm or less, in consideration of, for example, the balance of characteristics, cost, and workability. Is preferably 150 μm or less.

Although the fabric weight of the moisture-permeable waterproof sheet 10 is not particularly limited, for example, in consideration of appropriate moisture permeability and time-lapse durability, etc., it is preferably 50 g / m ² or more, and more preferably 80 g / m ² or more It is preferably 200 g / m ² or less, more preferably 150 g / m ² or less.

  The non-woven fabric 11a made of the first polyethylene terephthalate fiber is a light-shielding sheet having weather resistance and strength, moisture permeability, and a light shielding function to cut ultraviolet light, and has a light shielding rate measured according to the JIS_L_1055_A method. It is preferably 90% or more, preferably 95% or more. If the light shielding rate of ultraviolet light is 90% or more, the moisture permeable waterproof sheet 10 is exposed to ultraviolet light by applying the non-woven fabric 11a made of the first polyethylene terephthalate fiber to the front surface side (the opposite side of waste). Can be prevented, and the deterioration of the moisture-permeable and waterproof sheet 10 can be suppressed. In addition, in order to improve wear durability, the nonwoven fabric 11a made of the first polyethylene terephthalate fiber is a heat-bonded nonwoven fabric subjected to embossing, a nonwoven fabric subjected to mechanical entanglement processing, and a hair-baked processing on the surface of the nonwoven fabric after mechanical interlocking processing. Non-woven fabrics applied, non-woven fabrics subjected to binder treatment after mechanical entanglement, etc. can be preferably used.

  The non-woven fabric 11a made of the first polyethylene terephthalate fiber is not particularly limited as long as it can satisfy the above-mentioned light blocking ratio. The non-woven fabric 11 a made of the first polyethylene terephthalate fiber preferably has higher moisture permeability than the moisture-permeable waterproof sheet 10 so that the moisture-permeable performance of the moisture-permeable waterproof sheet 10 is not impaired.

  In addition, you may mix and use 2 or more types of materials of the nonwoven fabric 11a which consists of a 1st polyethylene terephthalate fiber in the range which does not impair the effect of this invention. The non-woven fabric 11a made of the first polyethylene terephthalate fiber is preferably colored in order to increase the light shielding rate. The pigment used for coloring here is preferably carbon black or an inorganic pigment which is not easily deteriorated during spinning.

  The color of the non-woven fabric 11a made of the first polyethylene terephthalate fiber is not particularly limited, but usually, the side colored with the dye as described above is the outermost surface, so that the dye has a suitable color depending on the place of use. Choose. Thus, the dyes may be used alone or in combination of two or more to adjust the color tone.

  The thickness of the nonwoven fabric 11a made of the first polyethylene terephthalate fiber is not particularly limited, but is preferably 0.3 mm or more, more preferably 0.4 mm or more, and preferably 1.0 mm or less. More preferably, it is 0.8 mm or less. When the thickness of the non-woven fabric 11a made of the first polyethylene terephthalate fiber is 0.3 mm or more, mechanical strength required as a capping sheet for covering wastes can be sufficiently secured. When the thickness of the nonwoven fabric 11a made of the first polyethylene terephthalate fiber is 1.0 mm or less, the sheet main body 2 is hard to be hard.

The basis weight of the non-woven fabric 11a made of the first polyethylene terephthalate fiber is not particularly limited, but is preferably 70 g / m ² or more, more preferably 100 g / m ² or more, and 300 g / m ² or less Is preferable, and 200 g / m ² or less is more preferable. With such a basis weight, it is possible to ensure sufficient flexibility and sufficient reinforcing effect to achieve good construction. By setting the fabric weight of the non-woven fabric 11a made of the first polyethylene terephthalate fiber to 70 g / m ² or more, the effect of improving the strength of the sheet main body 2 can be sufficiently expected. Further, by setting the fabric weight of the non-woven fabric 11a made of the first polyethylene terephthalate fiber to 300 g / m ² or less, the sheet main body 2 does not become hard and the workability does not decrease, which is economically advantageous.

  It is preferable to form a non-slip layer (not shown) by partially bonding a fiber having a diameter of 10 times or more that of the fibers constituting the sheet to the non-woven fabric 11a made of the first polyethylene terephthalate fiber. When the anti-slip layer is present, when forming the soil layer on the surface side, the soil is less likely to be slipped off even if there is a slope.

  The nonwoven fabric 11b made of the second polyethylene terephthalate fiber is a weather resistant sheet having weatherability and strength and moisture permeability, and preferably has a penetration resistance of 200 N or more, preferably 300 N or more, measured in accordance with ASTM_D — 4833. It is more preferable that If the penetration resistance is 200 N or more, the non-woven fabric 11b made of the second polyethylene terephthalate fiber is used as the back side (waste side) to dispose waste having a sharp shape like an injection needle to the illegally dumped waste Even when a thing is included, it can prevent that a hole or a tear arises and waterproofness is impaired.

  The non-woven fabric 11b made of the second polyethylene terephthalate fiber is not particularly limited as long as the above-mentioned penetration resistance can be satisfied, but it is preferable to use a non-woven fabric subjected to mechanical entanglement treatment. In addition, non-woven fabrics in which the surface of the non-woven fabric is subjected to hair-burning after mechanical entanglement, non-woven fabrics subjected to binder treatment after mechanical entanglement, and the like can be preferably used.

  The thickness of the non-woven fabric 11b made of the second polyethylene terephthalate fiber 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. More preferably, it is 5.0 mm or less. When the thickness of the nonwoven fabric 11b made of the second polyethylene terephthalate fiber is 0.2 mm or more, it is easy to make the penetration resistance 200 N or more, and when it is 10.0 mm or less, the sheet main body 2 is hard to be hard.

The basis weight of the non-woven fabric 11b made of the second polyethylene terephthalate fiber is not particularly limited, but is preferably 50 g / m ² or more, more preferably 150 g / m ² or more, and 1000 g / m ² or less Is preferable, and 500 g / m ² or less is more preferable. By setting the fabric weight of the nonwoven fabric 11b made of the second polyethylene terephthalate fiber to 50 g / m ² or more, the effect of improving the strength of the sheet main body 2 can be sufficiently expected. Further, by setting the fabric weight of the non-woven fabric 11b made of the second polyethylene terephthalate fiber to 1000 g / m ² or less, the sheet main body 2 does not become hard and the workability does not decrease, which is economically advantageous.

  The sheet body 2 has a moisture-permeable waterproof sheet 10 having a breaking elongation of 250% or more and a tear strength of 0.75 N or more, a non-woven fabric 11a of 0.3 to 1.0 mm in thickness made of the first polyethylene terephthalate fiber, and a thickness It is preferable that it is a laminated structure of at least 3 layers laminated | stacked integrally with the nonwoven fabric 11b which consists of a 0.2-10.0 mm 2nd polyethylene terephthalate fiber.

  From the viewpoint of securing waterproofness, the sheet body 2 preferably has a water resistance level of 1000 mm or more, more preferably 2000 mm or more, more preferably 5000 mm or more, measured in accordance with the water resistance test A method of JIS_L_1092. It is further preferred that If the water resistance level of the sheet body 2 is 1000 mm or more, rainwater and the like can be sufficiently prevented from infiltrating to the waste side, and contamination of the soil under the waste can be suppressed.

From the viewpoint of securing moisture permeability, the sheet body 2 preferably has a moisture permeability of 100 g / m ² · 24 hr or more, preferably 1000 g / m ² · 24 hr or more, measured in accordance with the JIS_L_1099_A-1 method. More preferably, it is more preferably 3000 g / m ² · 24 hr or more. Translucent humidity is higher moisture permeability is large is good, practical upper limit is 10000g ^/ m 2 · 24hr, and more preferably 8000g ^/ m 2 · 24hr. If the moisture permeability of the sheet main body 2 is 100 g / m ² · 24 hr or more, it is possible to prevent the gas and the water vapor generated from the waste from being trapped in the space covered by the capping sheet and to prevent the tearing. it can.

  There is no particular limitation on the bonding method of the moisture-permeable waterproof sheet 10 and the non-woven fabric 11 made of polyethylene terephthalate fiber, and a known method such as a heat fusion laminating method or a method using an adhesive can be adopted. In the case of using an adhesive, care must be taken so as not to impair the moisture permeability, for example, heat fusion or thermal adhesion using a hot melt powder, an adhesive of a hot melt fiber type, etc. It is good to do.

  The heat fusion temperature or heat adhesion temperature is preferably 60 ° C. or more, more preferably 100 ° C. or more, and preferably 200 ° C. or less, more preferably 130 ° C. or less. When the heat sealing temperature or the heat bonding temperature is 200 ° C. or less, the laminate sheet 1 is unlikely to be damaged due to the high temperature.

The heat fusion film 12 contains a low melting point material having a melting point lower than that of the moisture-permeable waterproof sheet 10 and the nonwoven fabric 11 made of polyethylene terephthalate fiber. The heat fusion film 12 may be at least one layer comprising a low melting point material, preferably a low melting point layer comprising a low melting point material and a high melting point layer comprising a high melting point material having a melting point higher than the low melting point material. It is preferable that it is a laminated structure of two or more layers, and more preferably three or more layers.
FIG. 5 is a cross-sectional view of the heat fusion film. As shown in FIG. 5, it is preferable that the heat fusion film 12 has a three-layer structure in which the low melting point substance layers 13 are laminated one by one on both surfaces of one high melting point substance layer 14.

  The melting point of the low melting point substance is preferably 150 ° C. or less, more preferably 130 ° C. or less. If the melting point of the low melting point substance is 150 ° C. or less, heat fusion at a relatively low temperature is easy.

  The melting point of the high melting point substance is preferably 160 ° C. or more, and more preferably 170 ° C. or more. When the melting point of the high melting point material is 160 ° C. or higher, breakage of the high melting point material layer 14 hardly occurs at the time of heat fusion, and the waterproofness is not impaired.

  20-500 micrometers is preferable, and, as for the thickness of the whole heat sealing film 12, more preferably, it is 30-300 micrometers. When the total thickness of the fusion film 12 is 20 μm or more, breakage of the film hardly occurs. If the total thickness of the fusion film 12 is 500 μm or less, the flexibility is not lost, and the followability to the unevenness of the installation site is not lost.

  In order to improve the weather resistance, a weathering agent and a primary adhesion can be applied to the heat fusion film 12. Further, the method of laminating the low melting point substance layer 13 and the high melting point substance layer 14 in the heat fusion film 12 is not particularly limited, and lamination by heat fusion is preferable.

  FIGS. 6 (a) and 6 (b) are partially enlarged views of a cross section schematically showing a method of joining laminated sheets according to the present invention.

  (1) In the step of combining, as shown in FIG. 6A, two or more laminated sheets 1 are prepared, and the heat fusible film of the first laminated sheet 1a and the heat fusible film of the second laminated sheet 1b Overlap. Although the width (width of the bonding portion) of the portion where the laminated sheets are stacked is not particularly limited, practically, it is preferable to be 50 mm or more and 150 mm or less.

  (2) In the bonding step, as shown in FIG. 6 (b), the portion stacked in the bonding step is heated by, for example, a self-propelled heating fuser to form the first laminated sheet 1a and the second laminated sheet 1b. Heat weld with The width of the heat-welded portion (the width of the welded portion) is not particularly limited, but in practice, it is preferably 10 mm or more and 75 mm or less.

  The heating temperature in the bonding step is not particularly limited as long as the high melting point substance layer 14 in the heat fusion film 12 is not damaged, but is preferably 400 ° C. or less, and 300 ° C. or less Is more preferable, and 150.degree. C. or more is more preferable. The processing speed is preferably 0.5 m / min or more, more preferably 1.0 m / min or more, and still more preferably 5.0 m / min or less.

  In addition, although the joining method demonstrated above is a method of joining the long side of the lamination sheet 1, it can also join the short side of the lamination sheet 1 by the same method. However, since the heat fusible film is not laminated on the short side of the laminated sheet 1 and the exposed surface 10 d does not exist, when the short sides of the laminated sheet 1 are joined, the first sheet When overlapping the short side of the second sheet body with the short side of the second sheet main body, the exposed surface 10d of the moisture-permeable waterproof sheet 10 is provided on the short side of the first laminated sheet 1a. The exposed surface 10d of the moisture-permeable waterproof sheet 10 of the laminated sheet 1a, at least one surface of the nonwoven fabric 11 made of polyethylene terephthalate fiber, and, if necessary, the side of the nonwoven fabric 11 made of polyethylene terephthalate fiber The exposed surface 10d of the moisture-permeable waterproof sheet 10 is provided on the side, and the single heat-fusion film 12 is used as the exposed surface 10d of the moisture-permeable waterproof sheet 10 of the second laminated sheet 1b. At least one surface of the nonwoven fabric 11 made of Chi terephthalate fibers, and optionally should be present on the side surface of the nonwoven fabric 11 made of polyethylene terephthalate fibers. Moreover, the joining method at the time of joining such a short side can be used also when joining a long side, or when joining a short side and a long side.

  Alternatively, similarly to the long side, the exposed surface 10 d of the moisture-permeable waterproof sheet 10 can be provided on the short side of the laminated sheet 1, and the heat fusible film 12 can be laminated. However, since the short side of the laminated sheet 1 is often cut in accordance with the size of the covering region, the bonding method for bonding the short sides as described above is also used in bonding the cut portions. It is necessary to use

  It is preferable that the water resistance water level measured according to the prescription | regulation of water resistance test A method of JIS_L_1092 is 1000 mm or more, and, as for the junctional part of laminated sheets, it is more preferable that it is 2000 mm or more. When the water resistance level of the joint portion is 1000 mm or more (more preferably 2000 mm or more), the permeation of water through the joint interface is suppressed, so that sufficient waterproofness can be maintained at the joint portion.

  The bonding strength between the laminated sheets is preferably 300 N / 5 cm or more, and more preferably 500 N / 5 cm or more, as measured in accordance with JIS_L_1906. When the bonding strength of the bonding portion is 300 N / 5 cm or more, the bonding portion is not broken by an external force that is usually assumed.

  In the sheet main body 2, it is preferable to further laminate a non-woven fabric (not shown) made of a third polyethylene terephthalate fiber on the surface side of the non-woven fabric 11a made of the first polyethylene terephthalate fiber. The non-woven fabric made of the third polyethylene terephthalate fiber is a weather-resistant sheet having the same moisture resistance as the non-woven fabric 11b made of the second polyethylene terephthalate fiber, which has weatherability and strength, and which is measured according to ASTM D 4833 It is recommended that the resistance be 200 N or more, more preferably 250 N or more, and even more preferably 300 N or more. If the penetration resistance of the non-woven fabric made of the third polyethylene terephthalate fiber is 200 N or more, the water resistance is unlikely to decrease with time, and when it is assumed that the worker walks on the laminated sheet 1, holes and tears occur to waterproof the product. It is possible to prevent the loss of the property and reduce the damage when heavy equipment can overturn the earth and sand.

  The non-woven fabric made of the third polyethylene terephthalate fiber is not particularly limited as long as the above-mentioned penetration resistance can be satisfied, but the same non-woven fabric 11a made of the first polyethylene terephthalate fiber can be used. Since the nonwoven fabric made of the third polyethylene terephthalate fiber may be on the surface side, it is preferable to have a light shielding function, for example, to increase the light shielding rate as in the case of the nonwoven fabric 11 a made of the first polyethylene terephthalate fiber Is preferred.

  The thickness of the non-woven fabric made of the third polyethylene terephthalate fiber is not particularly limited, but is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 3.0 mm or less. More preferably, it is not more than 0. 0 mm. When the thickness of the nonwoven fabric made of the third polyethylene terephthalate fiber is 0.5 mm or more, it is easy to make the penetration resistance 200 N or more, and when it is 3.0 mm or less, the sheet main body 2 is hard to be hard.

The basis weight of the non-woven fabric comprising the third polyethylene terephthalate fiber is not particularly limited, but is preferably 50 g / m ² or more, more preferably 100 g / m ² or more, and 3000 g / m ² or less Preferably, it is 2000 g / m ² or less. Appropriate mechanical strength and durability can be maintained by setting the basis weight of the non-woven fabric composed of the third polyethylene terephthalate fiber to 50 g / m ² or more and 3000 g / m ² or less.

  In addition, for example, by using a waterproof sheet such as a vinyl chloride sheet or a polyethylene sheet having waterproofness and no moisture permeability as a part of the sheet main body 2, the bonding cost can be reduced or the construction time can be shortened. There is a possibility. Moreover, the laminated sheet 1 according to the present invention is suitably used not only for temporarily covering illegally dumped waste but also for waste in a waste disposal site which is semipermanently landfilled.

  As described above, according to the laminate sheet 1 according to the present invention, the first lamination can be performed only by overlapping the heat fusion film of the first lamination sheet 1 a and the heat fusion film of the second lamination sheet 1 b. Since the sheet 1a and the second laminated sheet 1b can be joined, the operation is simple and easy, and the workability is good. Furthermore, the laminated sheet 1 is made of the exposed surface 10d of the moisture-permeable waterproof sheet 10, the at least one surface of the non-woven fabric 11 made of polyethylene terephthalate fibers, and optionally polyethylene terephthalate fibers on at least one side of the sheet body. Between the moisture-permeable waterproof sheet 10 and the heat-fusion film 12 when the heat-fusion film of the first laminate sheet 1 a and the heat-fusion film of the second laminate sheet 1 b are joined to each other. There is no path for water to leak, and there is no loss of waterproofness.

  Since the heat fusion film 12 has a laminated structure of the low melting point material layer 13 and the high melting point material layer 14, the high melting point material layer 14 is damaged by heat when the laminated sheet 1 according to the present invention is heat fused. It is difficult to do.

  Since waste from illegal dumping sites must eventually be transported to a disposal site, when capping these wastes, the capping sheet surface is often not covered with soil. Therefore, the capping sheet is required to have weatherability superior to that of the prior art, but the laminate sheet 1 according to the present invention is a light shielding sheet having weatherability and a light shielding function on the surface side (the opposite side to waste). Since the nonwoven fabric 11a which consists of a certain 1st polyethylene terephthalate fiber is laminated | stacked, waterproofness can be hold | maintained over a long period of time.

DESCRIPTION OF SYMBOLS 1, 1a, 1b Laminated sheet 10 Moisture-permeable waterproof sheet 10d Exposed surface 11, 11a, 11b Non-woven fabric composed of polyethylene terephthalate fibers 12, 12a, 12b Heat fusion film 13 Low melting point material layer 14 High melting point material layer

Claims (14)

A sheet body in which a non-woven fabric made of polyethylene terephthalate fibers is laminated on both sides of a moisture-permeable waterproof sheet,
A laminated sheet comprising: a material constituting the moisture-permeable waterproof sheet; and a heat fusion film containing a low melting material having a melting point lower than that of the polyethylene terephthalate,
At least one side of the non-woven fabric made of polyethylene terephthalate fiber is a non-woven fabric subjected to mechanical entanglement treatment,
The heat fusion film has a laminated structure of a low melting point substance layer comprising the low melting point substance and a high melting point substance layer comprising a high melting point substance having a melting point higher than the low melting point substance,
At least one side of the sheet body, at least one side of the moisture-permeable waterproof sheet has an exposed surface on which the non-woven fabric made of polyethylene terephthalate fibers does not exist, and the heat fusion film is present on the exposed surface of the moisture-permeable waterproof sheet.
The heat fusible film is present on at least one side of the non-woven fabric made of polyethylene terephthalate fiber at the one side of the sheet main body, and the heat fusible film or the moisture-permeable film is made on the side of the non-woven fabric made of polyethylene terephthalate fiber A laminated sheet characterized by the presence of a waterproof sheet.   The thickness from the end to the range of 5 cm from at least one end in the short side direction of the laminated sheet is 4/5 or less of the thickness with respect to the thickness of the center in the short side direction. Laminated sheet.   The laminated sheet according to claim 1 or 2, wherein the non-woven fabric made of polyethylene terephthalate fiber is a non-woven fabric on which at least one side is treated with a binder. The sheet body is rectangular,
The laminated sheet according to any one of claims 1 to 3, wherein the heat fusion film is present on both long sides of the sheet main body.   The first heat fusion film laminated on the upper part of the sheet main body and the second heat fusion film laminated on the lower part of the sheet main body are directly bonded at the side part of the sheet main body. The lamination sheet as described in any one of 4.   The laminated sheet according to claim 5, wherein a portion where the first heat fusion film and the second heat fusion film are directly bonded to each other is 3 mm or more. The heat fusion film is
The laminated sheet according to any one of claims 1 to 6, wherein one heat fusion film is bent and attached to the upper part, the lower part, and the side part of the sheet main body. The low melting point substance is
Melting | fusing point is 150 degrees C or less, The lamination sheet in any one of Claims 1-7. The high melting point substance is
Melting | fusing point is 160 degreeC or more, The lamination sheet in any one of Claims 1-8 . The heat fusion film is
The laminated sheet according to any one of claims 1 to 9 , wherein the low melting point substance layer is laminated on both sides of the high melting point substance layer. The laminated sheet according to any one of claims 1 to 10 , wherein the heat fusible film is present in an area of 50 to 500 mm from the side surface of the non-woven fabric made of polyethylene terephthalate fibers in the upper and lower portions of the sheet body. The sheet body is
Laminated sheet according to any one of claims 1 to 11, nonwoven fabric of the polyethylene terephthalate fiber to both surfaces of the moisture permeable waterproof sheet is laminated. A combination step of preparing two or more laminated sheets according to any one of claims 1 to 12 , and laminating the heat-fusion film of the first laminated sheet and the heat-fusion film of the second laminated sheet on each other;
A method of joining laminated sheets, comprising: a joining step of heating the first laminated sheet and the second laminated sheet by heat-welding the portions superposed in the joining step. It is a joining method of a lamination sheet which joins lamination sheets containing a sheet main part on which a moisture-permeable waterproof sheet and a nonwoven fabric which consists of polyethylene terephthalate fibers were laminated,
One side of the first sheet body and one side of the second sheet body
Thermal fusion having a laminated structure of the moisture-permeable waterproof sheet, a low melting point substance layer comprising a low melting point substance having a melting point lower than the polyethylene terephthalate, and a high melting point substance layer comprising a high melting point substance having a melting point higher than the low melting point substance Film,
An exposed surface where the non-woven fabric made of the polyethylene terephthalate fiber is not present on at least one side of the moisture-permeable waterproof sheet, and at least one surface of the non-woven fabric made of the polyethylene terephthalate fiber,
As the heat fusible film or the moisture-permeable waterproof sheet is present on the side surface of the non-woven fabric made of the polyethylene terephthalate fiber,
An aligning step of overlapping one side of the first sheet body and one side of the second sheet body;
And a bonding step of heating the first sheet body and the second sheet body by heat-fusing the portions overlapped in the bonding step to thermally bond the first sheet body and the second sheet body.