Laminated member and method for manufacturing laminated member

Abstract

To provide: a laminate member with which a surface member can be suitably adhered to an adhesion target member at a desired adhesive strength; and a method for manufacturing the laminate member.SOLUTION: Laminate members 10, 110 respectively include tabular surface members 11, 111, and tabular adhesion auxiliary members 13, 113 disposed on rear surfaces of the surface members 11, 111 in order to assist adhesion of tabular adhesion target members (base members 12, 112) to rear surface sides of the surface members 11, 111.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a laminated member and a method for manufacturing a laminated member. [Background technology]

[0002] As a laminated member, Patent Document 1 discloses an artificial turf installation structure in which an artificial turf 11 (surface member) is adhered to a second foam sheet 6 (object to be adhered) via a third adhesive layer 7. In this laminated member, the surface member is adhered to the object to be adhered via the adhesive. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 57-12405 Summary of the Invention [Problem to be solved by the invention]

[0004] In the laminated member disclosed in the above-mentioned Patent Document 1, it is required that the surface member be properly bonded to the member to be bonded with a desired adhesive strength.

[0005] The present invention has been made to solve the above-mentioned problems, and aims to provide a laminated member and a method for manufacturing a laminated member that can properly adhere a surface member to a member to be adhered with a desired adhesive strength. [Means for solving the problem]

[0006] In order to solve the above problems, the laminated member of the present invention is characterized by comprising a plate-shaped surface member and a plate-shaped adhesion auxiliary member provided on the back surface of the surface member to assist in adhesion of a plate-shaped adhesion target member to the back surface side of the surface member.

[0007] According to the laminated member of the present invention, the adhesive auxiliary member can assist in adhering the member to be adhered to the back side of the surface member, making it possible to properly adhere the surface member to the member to be adhered with the desired adhesive strength.

[0008] In the laminated member according to the present invention, it is preferable that a ridge portion is formed on at least one of the back surface of the surface member and the front surface of the adhesive auxiliary member. This makes it possible to form a desired space between the surface member and the adhesive auxiliary member. This in turn makes it possible to flow a fluid (liquid or gas) through the space.

[0009] In addition, the laminated member according to the present invention is characterized by comprising a plate-shaped surface member, a plate-shaped base member, and a plate-shaped adhesion auxiliary member provided on the back surface of the surface member to assist in adhesion of the base member to the back surface side of the surface member.

[0010] According to the laminated member of this invention, the plate-shaped adhesive auxiliary member can assist in adhering the base member to the back side of the surface member, making it possible to properly adhere the surface member to the base member with the desired adhesive strength.

[0011] In the laminated member according to the present invention, the strain of the adhesion auxiliary member is preferably set to a value greater than the strain of the base member. This makes it possible to maintain high adhesion between the surface member and the base member, even when the contact between the surface member and the base member is poor (for example, when the back surface of the surface member is uneven and the front surface of the base member is flat), because the strain of the adhesion auxiliary member is greater than the strain of the base member.

[0012] In the laminated member according to the present invention, the adhesion auxiliary member is preferably adhered to the surface member via an adhesive that does not contain an organic solvent, which makes it possible to provide an environmentally friendly laminated member (one that imposes less burden on the environment).

[0013] In the laminated member according to the present invention, the adhesive is preferably a hot melt adhesive, which makes it possible to provide a laminated member that is more environmentally friendly.

[0014] In the laminated member according to the present invention, the surface member is preferably artificial turf. This makes it possible to properly bond the artificial turf to the bonded member with a desired adhesive strength in a laminated member using artificial turf as the surface member.

[0015] In addition, the laminated member according to the present invention is characterized in that it comprises a plate-shaped base member and a plate-shaped adhesive auxiliary member provided on the surface of the base member to assist in adhering a plate-shaped adhesive target member to the surface side of the base member.

[0016] According to the laminated member of the present invention, the adhesive auxiliary member can assist in adhering the member to be adhered to the surface side of the base member, making it possible to properly adhere the base member to the member to be adhered with the desired adhesive strength.

[0017] Furthermore, the method for manufacturing a laminated member according to the present invention is a method for manufacturing a laminated member comprising a plate-shaped surface member and a plate-shaped adhesion auxiliary member provided on the back surface of the surface member to assist in adhering a plate-shaped adhesion target member to the back surface side of the surface member, and is characterized by comprising an application step of applying adhesive to at least one of the back surface of the surface member and the surface of the adhesion auxiliary member, and a crimping step of crimping the surface member and the adhesion auxiliary member together after the application step.

[0018] According to the manufacturing method of the laminated member of the present invention, the adhesive can be applied to at least one of the back surface of the surface member and the front surface of the adhesion auxiliary member in the application step. Furthermore, the surface member and the adhesion auxiliary member can be pressure-bonded together after the application step in the pressure-bonding step. Therefore, it is possible to manufacture a laminated member in which the surface member is appropriately bonded to the adhesion target member with the desired adhesive strength. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide a laminated member and a method for manufacturing a laminated member that can properly bond a surface member to a bonding target member with a desired bonding strength. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view showing an embodiment of a laminated member 10 according to the present invention. [Figure 2] 1 is a cross-sectional view showing an embodiment of a method for manufacturing a laminated member 10 according to the present invention. [Figure 3] FIG. 3 is a cross-sectional view showing another embodiment of a laminated member 110 according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] An embodiment of a laminated member 10 and a method for manufacturing the same according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to this embodiment, and can be embodied in various forms with various modifications and improvements based on the knowledge of those skilled in the art.

[0022] (Laminated material) 1, the laminated member 10 includes a surface member 11, a base member 12, and an adhesion auxiliary member 13. The laminated member 10 is formed by laminating the surface member 11, the adhesion auxiliary member 13, and the base member 12 in this order. The surface member 11 is adhered to the adhesion auxiliary member 13 via a first adhesive layer 21, and the base member 12 is adhered to the adhesion auxiliary member 13 via a second adhesive layer 22.

[0023] The surface member 11 is a plate-shaped piece of artificial turf. The surface member 11 includes a turf portion 11a, a sheet portion 11b, and a ridge portion 11c. The turf portion 11a includes a large number of lanceolate linear members. The lanceolate linear members are flat, elongated, pointed at the tip, and slightly wider at the base, and are made of, for example, polyethylene or polypropylene.

[0024] The sheet portion 11b is a sheet-like member on which the turf portion 11a is planted, and is made of, for example, polypropylene. The bases of the lanceolate linear members of the turf portion 11a are planted in the sheet portion 11b. For example, the bases of the lanceolate linear members are sewn to the sheet portion 11b. The sewn portions protrude from the back surface of the sheet portion 11b, forming the convex rib portion 11c. In this manner, the convex rib portion 11c is provided on the back surface of the surface member 11, i.e., the back surface of the sheet portion 11b. The convex rib portion 11c is preferably formed from the same material as the sheet portion 11b or the same material as the turf portion 11a. The convex rib portion 11c is preferably a linear convex portion. Note that the convex rib portion 11c may be formed by providing multiple convex portions intermittently on a straight line.

[0025] The ridges 11c protrude from the back surface of the sheet 11b to allow the turf 11a to stand. For example, the base of the turf 11a may penetrate the sheet 11b, and the ridges 11c may be formed to fix the protruding portion. The protruding portion may directly form the ridges 11c, or the ridges 11c may be formed to cover the protruding portion.

[0026] The rear surface of the surface member 11 is preferably coated with, for example, a rubber material. Examples of the rubber material include natural rubber and synthetic rubber. Examples of the synthetic rubber include isoprene rubber, butadiene rubber, styrene butadiene rubber, acrylic rubber, urethane rubber, and silicone rubber.

[0027] The surface member 11 is not limited to artificial turf, and other materials such as outdoor flooring materials or indoor flooring materials that have a shock absorbing function may also be used.

[0028] The base member 12 is a member to which the surface member 11 is adhered. The base member 12 is adhered to the surface member 11 to maintain high strength of the surface member 11. The base member 12 is formed in a plate shape.

[0029] The base member 12 is preferably formed from natural rubber or synthetic rubber such as ethylene propylene diene rubber (EPDM), styrene butadiene rubber (SBR), nitrile rubber (NBR), butadiene rubber (BR), butyl rubber (isobutylene-isoprene rubber) (IIR), silicone rubber, or fluororubber. The base member 12 is formed from foamed rubber, rubber pellets formed by crushing rubber into granules of a predetermined shape such as spheres or cylinders and then solidifying them, or pellet agglomerates formed by agglomerating these pellets. The base member 12 may also be formed from a single piece.

[0030] The adhesion auxiliary member 13 is a member that assists in bonding the surface member 11 and the base member 12. In other words, the adhesion auxiliary member 13 can also be said to be a member that is provided on the back surface of the surface member 11 and that assists in bonding the base member 12 to the back surface side of the surface member 11. In this case, the base member 12 is the member to be bonded to the surface member 11. In addition, the adhesion auxiliary member 13 can also be said to be a member that is provided on the surface of the base member 12 and that assists in bonding the surface member 11 to the front surface side of the base member 12. In this case, the surface member 11 is the member to be bonded to the base member 12.

[0031] The adhesion auxiliary member 13 is formed in a plate shape. The thickness of the adhesion auxiliary member 13 is preferably set to a value greater than the height of the ridge portion 11c. In this embodiment, since the height of the ridge portion 11c is approximately 3 mm, the thickness of the adhesion auxiliary member 13 is preferably set to a value greater than 5 mm. The adhesion auxiliary member 13 is formed of a soft material having a hardness less than a predetermined value. The hardness is preferably 80 (Shore A) or less, and more preferably 60 (Shore A) or less. Examples of soft materials include polyurethane, polystyrene, polyethylene (PE, including foam), polypropylene (PP, including foam), nonwoven fabric, ethylene vinyl acetate (EVA), and thermoplastic elastomer. Examples of thermoplastic elastomers include olefin-based thermoplastic elastomer (TPO), polyurethane-based thermoplastic elastomer (TPU), styrene-based thermoplastic elastomer (TPS), and soft polyvinyl chloride (PVC).

[0032] Nonwoven fabrics include staple fiber nonwoven fabrics and long fiber nonwoven fabrics. Examples of staple fiber nonwoven fabrics include spunlace nonwoven fabrics, which are produced by entangling fibers (especially short fibers) in a web using a high-pressure water stream without using a binder (adhesive); needle-punched nonwoven fabrics, which entangle fibers by reciprocating needles; and thermally bonded nonwoven fabrics using heat-sealed fibers. Examples of long fiber nonwoven fabrics include spunbond nonwoven fabrics, meltblown nonwoven fabrics, and flash-spun nonwoven fabrics. Spunbond nonwoven fabrics are nonwoven fabrics made by melting or dissolving a polymer and layering continuous fibers (filaments) spun from a nozzle onto a moving screen, using one or more bonding methods. Meltblown nonwoven fabrics are nonwoven fabrics made by spinning a polymer into a high-velocity hot gas stream to form fibers, cooling them, and then accumulating them on a moving screen, using one or more bonding methods. Flash-spun nonwoven fabrics are made by spinning a polymer solution through a nozzle under certain conditions, evaporating the solvent immediately after spinning, and then layering the fibers on a moving screen to form highly fibrillated filaments using one or more bonding methods. The polymers mentioned above are high-molecular organic compounds, such as polyamide, polyethylene, polypropylene, polyurethane, and other thermoplastic resins (synthetic resins).

[0033] Furthermore, the strain of the adhesion auxiliary member 13 is preferably set to a value greater than the strain of the base member 12. The adhesion auxiliary member 13 is a member whose strain is within a predetermined range. The predetermined range is preferably 25 to 75%, and more preferably 40 to 60%. The strain is the ratio of the deformation amount ΔL to the original (before deformation) length L (strain = ΔL / L).

[0034] The first adhesive layer 21 is a layer formed from a first adhesive. The first adhesive is preferably an adhesive that does not contain an organic solvent. For example, the first adhesive may be a hot melt adhesive. A hot melt adhesive is an adhesive that is melted by applying heat to bond, and is made of a thermoplastic synthetic resin such as ethylene vinyl acetate (EVA). In this embodiment, a moisture-curing hot melt adhesive is used as the hot melt adhesive. The second adhesive layer 22 is formed from a second adhesive that is the same as the first adhesive.

[0035] The moisture-curing hot melt adhesive is a urethane-based moisture-curing hot melt adhesive whose main component is a urethane prepolymer. The moisture-curing hot melt adhesive is obtained by the reaction of a polyester polyol with an isocyanate compound and has an isocyanate group (NCO) at the terminal. A terminal NCO group of 1 to 3% is particularly preferred. Examples of polyester polyols include polyester polyols obtained by polycondensation of aliphatic carboxylic acids such as malonic acid, succinic acid, and adipic acid, or aromatic carboxylic acids such as phthalic acid, with aliphatic glycols such as ethylene glycol, diethylene glycol, and propylene glycol. The polyester polyol is preferably made from a dicarboxylic acid having 6 or more carbon atoms (e.g., adipic acid, sebacic acid), and more preferably contains 80% or more by weight of a crystalline ester polyol with a melting point of 45°C or higher. The glycol constituting the polyester polyol may be an alcohol having 4 or more carbon atoms (e.g., 1,4-butanediol, 1,6-hexanediol). Furthermore, as the isocyanate compound, aromatic isocyanates are preferred, and diphenylmethane diisocyanate (MDI) is particularly preferred. Furthermore, the moisture-curing hot melt adhesive may contain additives such as tackifiers, waxes, crystal nucleating agents, and antioxidants as needed. Furthermore, the moisture-curing hot melt adhesive is not limited to urethane-based moisture-curing hot melt adhesives, and polyester-based or acrylic-based moisture-curing hot melt adhesives may also be used.

[0036] When bonding the surface member 11 and the adhesion auxiliary member 13, the moisture-curing hot melt adhesive is applied to the back surface (application target) of the surface member 11 by roll coating using a roll coater. The moisture-curing hot melt adhesive may be applied only to the front surface (application target) of the adhesion auxiliary member 13, not just to the back surface of the surface member 11, or may be applied to both the back surface of the surface member 11 and the front surface of the adhesion auxiliary member 13. When bonding the adhesion auxiliary member 13 and the base member 12, the moisture-curing hot melt adhesive may be applied to the back surface of the adhesion auxiliary member 13 and / or the front surface of the base member 12.

[0037] An example of a roll coater used in roll coating is the roll coater described in JP 2018-184000 A. This roll coater includes a feed roll, a supply roll, an applicator roll, and a hot melt adhesive reservoir. The molten moisture-curing hot melt adhesive stored in the hot melt adhesive reservoir is supplied from a discharge section between the supply roll and the applicator roll while the target is being fed in one direction by the feed roll. The molten moisture-curing hot melt adhesive supplied between the supply roll and the applicator roll is supplied to the upper surface (coating surface) of the target by the rotation of the supply roll and the applicator roll. The molten moisture-curing hot melt adhesive supplied to the upper surface of the target comes into contact with the lower end of the outer circumferential surface of the rotating applicator roll and is applied to the upper surface of the target.

[0038] To facilitate smooth roll coating, the moisture-curing hot melt adhesive is preferably solid at room temperature, molten at 100°C or higher, and has a melt viscosity at 140°C (JIS K 6862) of 5 to 15 Pa·s (Pascal seconds). "Solid at room temperature" means solid at 20°C. The temperature range for the molten state can be set appropriately within the range of 100 to 160°C. Furthermore, the moisture-curing hot melt adhesive is preferably a urethane prepolymer containing a crystalline ester polyol. Taking seasonal changes into consideration, the crystalline polyester polyol is preferably (1) solid at room temperature with a melting point of 45°C or higher, and (2) has a solidification time of 1 to 5 minutes at room temperature after melt application. That is, in order for the moisture-curing hot melt adhesive to be applied to a long sheet while being rewound and to dry and cure quickly at room temperature within a specified equipment length, it is preferable that the adhesive contains a crystalline ester polyol, the NCO content of the urethane prepolymer is 1 to 3%, and the number average molecular weight is 1000 to 4000, and more preferably 1500 to 2500.

[0039] The amount of moisture-curing hot melt adhesive applied is 30 to 200 g / m 2 It is preferable that the density is 50 to 150 g / m 2 It is more preferable that the coating method is not limited to roll coating, and spray coating may also be used.

[0040] A particularly preferred spray application method is the curtain spray method, in which a moisture-curable hot melt adhesive is discharged from a plurality of nozzles arranged in a row under heating and pressure, and is spun into threads while being sprayed onto the surface material for lamination. According to the curtain spray method, thread-like molten resin is spun and stretched by a high-temperature, high-velocity air stream, and then sprayed directly onto the surface material for lamination.

[0041] In spray coating, the hot melt adhesive is applied using a well-known spray coating device. One known example of such a spray coating device is disclosed in Japanese Patent Application Laid-Open No. 2017-136735. The spray coating device applies a molten moisture-curing hot melt adhesive supplied from a moisture-curing hot melt adhesive storage tank to the adhesive application surface.

[0042] (Laminated member manufacturing method (manufacturing process)) Next, a method (manufacturing steps) for producing the above-mentioned laminated member 10 will be described with reference to Fig. 2. The method for producing the laminated member 10 includes a first applying step S1, a first pressure-bonding step S3, a second applying step S5, a second pressure-bonding step S7, and a curing step S9.

[0043] (First coating process, first bonding process) In the first application step S1, the hot melt adhesive 22a is applied to at least one of the front surface of the base member 12 and the back surface of the adhesion auxiliary member 13. In this case, the hot melt adhesive 22a is preferably applied by roll coating (described above). In this embodiment, the hot melt adhesive 22a is applied to both the front surface of the base member 12 and the back surface of the adhesion auxiliary member 13. In the roll coating, the hot melt adhesive 22a is applied by a well-known roll coating device (roll coater). The application amount is 30 to 200 g / m 2 It is preferable that the density is 50 to 150 g / m 2 It is more preferable that the coating method is spray coating instead of roll coating.

[0044] In the first pressure-bonding step S3, the base member 12 and the adhesion auxiliary member 13 are pressure-bonded together after the first application step S1. In the first pressure-bonding step S3, the base member 12 and the adhesion auxiliary member 13 are first stacked together with their surfaces coated with adhesive 22a (adhesive-coated surfaces) facing each other (if adhesive is applied to only one side, the front surface of the base member 12 is aligned with the back surface of the adhesion auxiliary member 13). Thereafter, the stacked base member 12 and adhesion auxiliary member 13 are compressed by a predetermined compression amount using a press device. This forms a base member 31 with an auxiliary member, which is the base member 12 to which the adhesion auxiliary member 13 is adhered.

[0045] The predetermined compression amount is preferably 40 to 60% of the thickness of the object to be compressed, and in this embodiment, this ratio is set to 50%. The compression is carried out for a predetermined time (e.g., 40 seconds). The predetermined time is preferably set to 40 to 80 seconds.

[0046] (Second coating process, second pressure bonding process) In the second application step S5, the hot melt adhesive 21a is applied to at least one of the front surface of the adhesion auxiliary member 13 and the back surface of the surface member 11. In this case, the hot melt adhesive 21a is preferably applied by roll coating (described above). In this embodiment, the hot melt adhesive 21a is applied to both the front surface of the base member 12 and the back surface of the adhesion auxiliary member 13. The amount of application is 30 to 200 g / m 2 It is preferable that the density is 50 to 150 g / m 2 It is more preferable that the amount of adhesive to be applied is set to an amount that can exhibit the desired adhesive strength and that does not fill the gaps between the ridge portions 11c, i.e., the recesses of the surface member 11, with adhesive. Furthermore, the application method may be spray application instead of roll coating.

[0047] In the second pressure-bonding step S7, the base member 31 with auxiliary members and the surface member 11 are pressure-bonded together after the second application step S5. In the second pressure-bonding step S7, the base member 31 with auxiliary members and the surface member 11 are first stacked together with the surfaces coated with adhesive 21a (adhesive-coated surfaces) facing each other (if adhesive is applied to only one side, the front surface of the adhesive auxiliary member 13 is aligned with the back surface of the surface member 11). Thereafter, the stacked base member 31 with auxiliary members and the surface member 11 are compressed by a predetermined compression amount using a press device. As a result, the surface member 11 is bonded to the base member 31 with auxiliary members to form the laminated member 10. It is preferable that the predetermined compression amount and compression time be set similarly to those in the first pressure-bonding step S3 described above.

[0048] The curing step S9 hardens the adhesives 21a and 22a of the laminated member 10 laminated in the second pressure-bonding step S7, completing the laminated member 10. In the curing step S9, the laminated member 10 after the second pressure-bonding step S7 is stored at a predetermined temperature and humidity for a predetermined time, whereby the hot melt adhesive cools naturally and reacts with moisture (humidification) in the air to harden. The hardening time required for the hot melt adhesive to completely harden through moisture curing is, for example, several hours to several dozen hours. The predetermined time is preferably set to 24 to 72 hours, and in this embodiment, it is set to 24 hours. The predetermined temperature is preferably set to 5 to 40°C, and in this embodiment, it is set to 15 to 30°C (so-called room temperature). The predetermined humidity is preferably set to a relative humidity of 40 to 95%, and in this embodiment, it is set to 45 to 85°C (so-called room humidity). [Example]

[0049] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples and can be practiced in various forms with various modifications and improvements based on the knowledge of those skilled in the art.

[0050] [Table 1]

[0051] The surface members 11, base members 12, adhesion auxiliary members 13, and adhesives shown in Table 1 were used to produce the laminated members 10 of Comparative Examples 1 and 2 and Examples 1 and 2.

[0052] The laminated member of Comparative Example 1 includes a surface member 11 and a base member 12, but does not include an adhesive auxiliary member 13. The surface member 11 is artificial turf, and the base member 12 is foam rubber pellets (15 mm thick). The surface member 11 and the base member 12 are bonded together with a chloroprene rubber solvent-based adhesive containing an organic solvent. The laminated member of Comparative Example 2, like Comparative Example 1, includes a surface member 11 and a base member 12, but does not include an adhesive auxiliary member 13. The surface member 11 and the base member 12 are bonded together with a urethane hot melt adhesive that does not contain an organic solvent, rather than using an adhesive that contains an organic solvent. The urethane hot melt adhesive is applied by roll coating as described above. Note that no pressure bonding was performed in Comparative Example 1, whereas in Comparative Example 2, pressure bonding was performed once after the two members were bonded together with the urethane hot melt adhesive.

[0053] Unlike Comparative Examples 1 and 2, the laminated members 10 of Examples 1 and 2 include not only a surface member 11 and a base member 12 but also an adhesive auxiliary member 13. The adhesive auxiliary member 13 is formed of foamed polyethylene and has a thickness of 5 mm. The laminated members 10 of Examples 1 and 2 use the same surface member 11 and base member 12 as those of Comparative Examples 1 and 2. The laminated members 10 of Examples 1 and 2 do not use an adhesive containing an organic solvent, but are bonded with a urethane-based hot melt adhesive that does not contain an organic solvent. The urethane-based hot melt adhesive is applied by roll coating as described above. In Example 1, the laminated members were bonded together using the urethane-based hot melt adhesive, followed by one press-bonding operation. In Example 2, the laminated members were bonded together using the urethane-based hot melt adhesive, followed by two press-bonding operations.

[0054] The adhesive strength of the laminated members 10 of each example and each comparative example was measured to evaluate the adhesiveness. Specifically, a 50 mm wide and 150 mm long cut was made in the skin of the laminated members 10 of Examples 1 and 2 and the laminated members of Comparative Examples 1 and 2, and the laminated members were used as test samples in accordance with JIS K6854-1:1999 "Adhesives - Test method for peel adhesion strength - Part 1: 90 degree peel", and measurements were made with a push-pull gauge (force gauge).

[0055] The adhesive strengths in Table 1 are average values ​​for three samples. Note that "material failure" in Table 1 indicates that in the peel test, the surface member 11 did not peel off at the interface with the adhesive auxiliary member 13, but the adhesive auxiliary member 13 broke (material failure), indicating good adhesion between the surface member 11 and the adhesive auxiliary member 13, and therefore good adhesion between the surface member 11 and the base member 12. Note that "interface peeling" in Table 1 indicates that in the peel test, the surface member 11 peeled off at the interface with the adhesive auxiliary member 13 (simple peeling), indicating poor adhesion between the surface member 11 and the adhesive auxiliary member 13, and therefore poor adhesion between the surface member 11 and the base member 12.

[0056] As is clear from Table 1, the laminated member of Comparative Example 1 has the surface member 11 and the base member 12 bonded together with an adhesive containing an organic solvent, and is evaluated as having good adhesion. However, because the adhesive contains an organic solvent, the laminated member of Comparative Example 1 is not environmentally friendly.

[0057] Therefore, from the viewpoint of environmental protection, there is a demand for the use of environmentally friendly adhesives, and in order to meet this demand, the use of adhesives that do not contain organic solvents has been considered. Specifically, in the laminated member of Comparative Example 2, a urethane-based hot melt adhesive was used as a substitute for adhesive to bond the surface member 11 and the base member 12. In Comparative Example 2, the surface member 11 and the base member 12 peel at the interface with a relatively small force (adhesion strength), and therefore the adhesion is evaluated as not good (poor).

[0058] Based on these results, the inventors discovered that the surface member 11 and the base member 12 can be bonded via an adhesive auxiliary member 13 that assists in bonding the surface member 11 and the base member 12. Specifically, in the laminate members 10 of Examples 1 and 2, the surface member 11 and the base member 12 are bonded via the adhesive auxiliary member 13. As is clear from Table 1, in the laminate members 10 of Examples 1 and 2, the surface member 11 and the base member 12 are bonded relatively more strongly than in Comparative Example 1 by the adhesive auxiliary member 13 that is bonded to the surface member 11 and the base member 12, respectively, with a urethane-based hot melt adhesive. Furthermore, the adhesion of Examples 1 and 2 is evaluated as good because both are material failures. Thus, the laminate members 10 of Examples 1 and 2 can be evaluated as having higher adhesion because of their high adhesive strength.

[0059] In the above-described embodiment, the convex ridges 11c are formed on the back surface of the surface member 11 and the surface of the adhesion auxiliary member 13 is formed flat. However, the convex ridges 113c may be formed on the surface of the adhesion auxiliary member 13 and the back surface of the surface member 111 may be formed flat. In this case, as shown in Fig. 3, the laminated member 110 includes a surface member 111, a base member 112, and an adhesion auxiliary member 113, similar to the above-described laminated member 10. The surface member 111 is adhered to the adhesion auxiliary member 113 via a first adhesive layer 21, and the base member 112 is adhered to the adhesion auxiliary member 113 via a second adhesive layer 22.

[0060] The surface member 111 is a shock absorbing member formed in a plate shape. The surface member 111 is a member having at least a flat back surface, and is formed from, for example, polyethylene or polypropylene. The base member 112 is formed in the same manner as the base member 12 described above. The adhesion assisting member 113 includes a sheet portion 113b formed in a sheet shape and a ridge portion 113c protruding from the surface of the sheet portion 113b. The ridge portion 113c is formed in the same manner as the ridge portion 11c described above. The adhesion assisting member 113 is formed from the same material as the adhesion assisting member 13 described above.

[0061] Next, a description will be given of a manufacturing method (manufacturing steps) for the laminated member 110. Similar to the manufacturing method for the laminated member 10 described above, the manufacturing method for the laminated member 110 includes a first application step S1, a first pressure-bonding step S3, a second application step S5, a second pressure-bonding step S7, and a curing step S9.

[0062] In the first application step S1, a hot melt adhesive is applied to at least one of the front surface of the base member 112 and the back surface of the adhesion auxiliary member 113. In the first pressure-bonding step S3, after the first application step S1, the base member 112 and the adhesion auxiliary member 113 are pressure-bonded together. This forms a base member 112 with the adhesion auxiliary member 113 bonded thereto, that is, an auxiliary-member-attached base member 131.

[0063] In the second application step S5, hot melt adhesive is applied to at least one of the front surface of the adhesive auxiliary member 113 and the back surface of the surface member 111. In the second pressure-bonding step S7, after the second application step S5, the base member 131 with auxiliary members and the surface member 111 are pressure-bonded together. As a result, the surface member 111 is bonded to the base member 131 with auxiliary members, and the laminated member 110 is formed. In the curing step S9, the adhesive of the laminated members 110 laminated in the second pressure-bonding step S7 is cured, and the laminated member 110 is completed.

[0064] (Actions and Effects of the Embodiments) The laminated members 10, 110 according to the above-described embodiments comprise a plate-shaped surface member 11, 111 and a plate-shaped adhesion assisting member 13, 113 provided on the back surface of the surface member 11, 111 to assist in adhesion of a plate-shaped adhesion target member (base member 12, 112) to the back surface side of the surface member 11, 111.

[0065] According to this laminated member 10, 110, the adhesive auxiliary member 13, 113 can assist in adhering the adhesive target member (base member 12, 112) to the back side of the surface member 11, 111, so that the surface member 11, 111 can be properly adhered to the adhesive target member (base member 12, 112) with the desired adhesive strength.

[0066] Furthermore, in the above-described laminated members 10, 110, it is preferable that the convex ridges 11c, 113c are formed on at least one of the rear surface of the surface member 11, 111 and the surface of the adhesion auxiliary member 13, 113. This makes it possible to form a desired space between the surface member 11, 111 and the adhesion auxiliary member 13, 113. This in turn makes it possible to flow a fluid (liquid or gas) through that space.

[0067] Furthermore, the above-mentioned laminated members 10, 110 include plate-shaped surface members 11, 111, plate-shaped base members 12, 112, and plate-shaped adhesion assisting members 13, 113 provided on the back surfaces of the surface members 11, 111 to assist in adhesion of the base members 12, 112 to the back surfaces of the surface members 11, 111.

[0068] According to this laminated member 10, 110, the plate-shaped adhesive auxiliary member 13, 113 can assist in adhering the base member 12, 112 to the back side of the surface member 11, 111, making it possible to properly adhere the surface member 11, 111 to the base member 12, 112 with the desired adhesive strength.

[0069] Furthermore, in the above-described laminated members 10, 110, it is preferable that the strain of the adhesion auxiliary members 13, 113 is set to a value larger than the strain of the base members 12, 112. With this, even if the contact between the surface members 11, 111 and the base members 12, 112 is poor (for example, when the back surface of the surface members 11, 111 is uneven and the surface of the base members 12, 112 is flat), it is possible to maintain high adhesion between the surface members 11, 111 and the base members 12, 112 because the strain of the adhesion auxiliary members 13, 113 is larger than the strain of the base members 12, 112.

[0070] In the above-described laminated members 10, 110, it is preferable that the adhesion auxiliary members 13, 113 are adhered to the surface members 11, 111 via an adhesive that does not contain an organic solvent. This makes it possible to provide environmentally friendly laminated members 10, 110 (which impose less burden on the environment).

[0071] Furthermore, in the above-described laminated members 10, 110, the adhesive is preferably a hot melt adhesive, which makes it possible to provide laminated members 10, 110 that are more environmentally friendly.

[0072] Furthermore, in the above-described laminated members 10, 110, it is preferable that the surface members 11, 111 are artificial turf. This makes it possible for the laminated members 10, 110, which use artificial turf as the surface members 11, 111, to properly bond the artificial turf to the bonded members (base members 12, 112) with the desired adhesive strength.

[0073] In addition, the above-mentioned laminated members 10, 110 include a plate-shaped base member 12, 112 and a plate-shaped adhesion assisting member 13, 113 provided on the surface of the base member 12, 112 to assist in adhesion of the plate-shaped adhesion target member (surface member 11, 111) to the surface side of the base member 12, 112.

[0074] According to this laminated member 10, 110, the adhesive auxiliary member 13, 113 can assist in adhering the adhesive target member (surface member 11, 111) to the surface side of the base member 12, 112, making it possible to properly adhere the base member 12, 112 to the adhesive target member (surface member 11, 111) with the desired adhesive strength.

[0075] Furthermore, the manufacturing method of the above-mentioned laminated member 10, 110 is a manufacturing method of the laminated member 10, 110 which comprises a plate-shaped surface member 11, 111 and a plate-shaped adhesion auxiliary member 13, 113 which is provided on the back surface of the surface member 11, 111 and assists in adhering a plate-shaped adhesion target member (base member 12, 112) to the back surface side of the surface member 11, 111, and comprises an application process (second application process S5) of applying adhesive to at least one of the back surface of the surface member 11, 111 and the surface of the adhesion auxiliary member 13, 113, and a crimping process (second crimping process S7) of crimping the surface member 11, 111 and the adhesion auxiliary member 13, 113 together after the application process (second application process S5).

[0076] According to this manufacturing method of the laminated members 10, 110, in the application step (second application step S5), it is possible to apply adhesive to at least one of the back surface of the surface member 11, 111 and the surface of the adhesion auxiliary member 13, 113. Furthermore, in the pressure-bonding step (second pressure-bonding step S7), it is possible to pressure-bond the surface member 11, 111 and the adhesion auxiliary member 13, 113 after the application step (second application step S5). Therefore, it is possible to manufacture the laminated members 10, 110 in which the surface member 11, 111 is appropriately bonded to the member to be bonded (base member 12, 112) with the desired adhesive strength. [Explanation of symbols]

[0077] 10,110...Laminated member, 11,111...Surface member, 11c,113c...Convex rib portion, 12,112...Base member, 13,113...Adhesive auxiliary member, 21a,22a...Adhesive (hot melt adhesive).

Claims

1. a plate-shaped surface member; a plate-shaped adhesion assisting member provided on the back surface of the surface member to assist in adhesion of a plate-shaped adhesion target member to the back surface side of the surface member; Equipped with The thickness of the adhesion auxiliary member is 5 mm or more, The surface member is an artificial turf.

2. a plate-shaped surface member; a plate-shaped adhesion assisting member provided on the back surface of the surface member to assist in adhesion of a plate-shaped adhesion target member to the back surface side of the surface member; Equipped with the surface member is artificial turf; The surface member includes a grass portion, a sheet portion on which the grass portion is planted, and a protruding strip portion protruding from the back surface of the sheet portion. A laminated member characterized in that the convex strip portion is made of the same material as the sheet portion or the grass portion.

3. a plate-shaped surface member; a plate-shaped adhesion assisting member provided on the back surface of the surface member to assist in adhesion of a plate-shaped adhesion target member to the back surface side of the surface member; Equipped with the surface member is artificial turf; The surface member includes a grass portion, a sheet portion on which the grass portion is planted, and a protruding strip portion protruding from the back surface of the sheet portion. The laminated member is characterized in that the convex strip portion is a sewn portion of the grass portion.

4. 4. The laminated member according to claim 1, wherein the adhesive auxiliary member is adhered to the surface member via a moisture-curable hot-melt adhesive that is solid at 20°C.

5. A method for manufacturing a laminated member according to any one of claims 1 to 3, an application step of applying an adhesive to at least one of the back surface of the surface member and the front surface of the adhesion assistant member; a pressure-bonding step of pressure-bonding the surface member and the adhesion-assisting member after the application step; A method for manufacturing a laminated member, comprising:

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