Laminated cork composite and method for producing the same

Abstract

To provide a laminated cork composite capable of retaining the expression of the intrinsic properties of cork and a method for producing the same.SOLUTION: A laminated cork composite (1) comprises a base material (2), an adhesive layer (3) containing an adhesive (3s) laminated on the base material (2), and a cork layer (4) containing cork particles (4t) laminated on the adhesive layer (3), where the cork particles (4t) are compressed against the adhesive layer (3).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to cork laminate composites and methods for making same. [Background technology]

[0002] In recent years, cork products using a cork layer have been put to practical use in various applications, such as daily necessities such as coasters and bags, tiles, flooring, wall materials, cushioning materials, taping materials, packaging materials, etc. The cork layer of such cork products comprises cork particles that are crushed bark of cork oaks, and in cork products, the various properties of the cork layer, such as heat insulation, sound absorption, elasticity, and / or design, are appropriately expressed according to the application, thereby improving the value of the cork product and, ultimately, the products to which it is applied.

[0003] Furthermore, in conventional cork products, a manufacturing method is known in which an adhesive is applied to a substrate such as plywood, a metal plate, or a glass plate, and then cork particles are layered on the substrate to a considerable thickness, thereby forming a cork layer containing cork particles on the substrate, which is a cork laminated composite (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 36-015799 Summary of the Invention [Problem to be solved by the invention]

[0005] In the cork laminated composites of the prior art described above, the surface side, i.e. the side of the cork layer opposite the substrate, is covered with adhesive, which can result in a problem that the inherent properties of cork are not expressed as easily.

[0006] An object of the present disclosure is to provide a cork laminated composite that can maintain the expression of properties inherent to cork, and a method for producing the same. [Means for solving the problem]

[0007] In order to solve the above problems, a cork laminated composite according to one embodiment of the present disclosure comprises a substrate, an adhesive layer containing an adhesive or pressure sensitive adhesive laminated on the substrate, and a cork layer containing cork particles laminated on the adhesive layer, the cork particles being pressed against the adhesive layer.

[0008] A method for producing a cork laminated composite according to one embodiment of the present disclosure is a method for producing a cork laminated composite having a cork layer, and includes an adhesive layer formation step of forming an adhesive layer containing an adhesive or pressure-sensitive adhesive on a base material, and a cork layer formation step of laminating cork particles on the adhesive layer to form the cork layer, in which the cork particles are laminated by applying pressure to the adhesive layer. Effect of the Invention

[0009] According to one aspect of the present disclosure, it is possible to provide a cork laminated composite and a method for producing the same that can maintain the expression of properties inherent to cork. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing an example of the configuration of a cork laminate composite according to a first embodiment of the present disclosure before the cork particles are pressed. [Diagram 2] FIG. 2 is a cross-sectional view showing an example of the configuration of the cork laminate composite when the cork particles are pressurized. [Diagram 3] 4 is a flowchart showing a method for producing the cork laminate composite. [Figure 4] FIG. 11 is a cross-sectional view showing an example of the configuration of a cork laminate composite according to a second embodiment of the present disclosure before the cork particles are pressed. [Diagram 5]FIG. 5 is a cross-sectional view showing an example of the configuration of the cork laminate composite shown in FIG. 4 in a state in which cork particles are pressed. [Figure 6] FIG. 11 is a cross-sectional view showing an example of the configuration of a cork laminate composite according to a third embodiment of the present disclosure before the cork particles are pressed. [Figure 7] FIG. 7 is a cross-sectional view showing an example of the configuration of the cork laminate composite shown in FIG. 6 in a state in which the cork particles are pressed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [Embodiment 1] Hereinafter, the first embodiment of the present disclosure will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a cross-sectional view showing an example of the configuration of a cork laminate composite 1P according to the first embodiment of the present disclosure before the cork particles 4t are pressed. Fig. 2 is a cross-sectional view showing an example of the configuration of the cork laminate composite 1 after the cork particles 4t are pressed. Note that the adhesive 3s of the adhesive layer 3 is not shown in Fig. 2.

[0012] In the following description, a cork laminated composite 1 is constructed as a sheet-like cork product using a plurality of cork particles 4t. In the following description, a case is illustrated in which at least one of size 1 particles and size 2 particles is used as the cork particles 4t. Size 1 cork particles 4t here refers to particles with a particle size of 1 mm or less, and size 2 cork particles 4t here refers to particles with a particle size within the range of 1 mm to 2 mm.

[0013] [Examples of cork laminate composite and cork layer configurations] As shown in Figures 1 and 2, the cork laminated composite 1P, 1 of this embodiment 1 includes a base material 2, an adhesive layer 3, and a cork layer 4. As described above, the cork layer 4 contains at least one of No. 1 and No. 2 cork particles 4t. As shown in Figure 2, in the cork layer 4, the cork particles 4t are laminated on the adhesive layer 3 in a state where they are pressed against the adhesive layer 3. The pressed state referred to here includes a state where a rolling machine or a pressing machine having a function of applying pressure is used (details will be described later).

[0014] Specifically, before the cork particles 4t are pressed against the adhesive layer 3, as shown in Figure 1, in the cork laminated composite 1P, the opposite ends of the multiple cork particles 4t have a large variation in height dimension (protrusion dimension) from the base material 2, and the ends on the base material 2 side are slightly embedded in the adhesive layer 3 and layered on the adhesive layer 3. In other words, in this cork laminated composite 1P, the above-mentioned pressure is not applied and the multiple cork particles 4t are not compressed, so each cork particle 4t is fixed to the base material 2 via the adhesive layer 3 while maintaining the height dimension it had before compression.

[0015] In addition, when the cork particles 4t are pressed against the adhesive layer 3, as shown in Fig. 2, in the cork laminated composite 1, the opposite ends of the cork particles 4t are laminated on the adhesive layer 3 with the ends on the substrate 2 side embedded in the adhesive layer 3 with the variation in height dimension (protrusion dimension) from the substrate 2 reduced compared to before compression. In other words, in this cork laminated composite 1, the cork particles 4t are compressed by the above pressure, so that the cork particles 4t are deformed so that the height dimensions of each cork particle 4t become approximately the same dimension, and are fixed to the substrate 2 via the adhesive layer 3. In addition, as shown in Fig. 2, in the finished cork laminated composite 1, the adhesive layer 3 is also pressed against the cork particles 4t of the cork layer 4, and the adhesive layer 3 is made into a very thin film.

[0016] Furthermore, in the cork layer 4, the cork particles 4t are in a pressurized state, so that the relatively small No. 1 cork particles 4t are densely packed into the gaps between the relatively large No. 2 cork particles 4t, as shown in Fig. 2. In other words, in the cork laminated composite 1 of this embodiment 1, the cork particles 4t that form the cork layer 4 are pressurized and deformed, increasing the surface area in contact with the adhesive layer 3, so that the cork particles 4t can be reliably bonded to the base material 2.

[0017] Furthermore, even if either No. 1 or No. 2 cork particles 4t are used, the cork particles 4t can be deformed by pressure to improve adhesion to the base material 2, just as in the case of a mixture of No. 1 and No. 2 particles.

[0018] [Example of substrate configuration] The substrate 2 is made of, for example, metal, film, paper, or fiber. Specifically, the metal may be, for example, a metal material such as a bonded steel plate (SECC), a stainless steel plate, or an aluminum steel plate. The film may be, for example, a synthetic resin film material such as polyethylene (PE) or polypropylene (PP). The fiber may be, for example, a cloth material such as a stretch fabric.

[0019] The base material 2 is made of the above-mentioned material and is made of a flexible material. Specifically, when the above-mentioned metal material is used for the base material 2, the thickness of the metal material can be set within a range of, for example, 0.01 mm to 0.2 mm, making it easy to construct a flexible cork laminated composite 1. When the above-mentioned synthetic resin film material is used for the base material 2, the thickness of the synthetic resin film material can be set within a range of, for example, 0.01 mm to 0.5 mm, making it easy to construct a flexible cork laminated composite 1.

[0020] Furthermore, when paper is used for the base material 2, the thickness of the paper material can be set within a range of, for example, 0.01 mm to 0.5 mm, making it easy to form a flexible cork laminated composite 1. When a cloth material is used for the base material 2, the thickness of the cloth material can be set within a range of, for example, 0.1 mm to 0.8 mm, making it easy to form a flexible cork laminated composite 1.

[0021] In the first embodiment, the base material 2 is formed using a flexible material as described above, so that the cork laminate composite 1 can be easily manufactured and can be easily attached to other components. Specifically, for example, the cork laminate composite 1 can be easily attached to the grip of a golf or fishing rod or the sole of a shoe, and the cork laminate composite 1 can be used as an anti-slip member for the grip or the sole. The cork laminate composite 1 can also be easily attached to the surface of a component of a house, such as wallpaper or a floor, and the cork laminate composite 1 can be used as a heat insulating material, a sound absorbing material, and / or a moisture absorbing material. Furthermore, the cork laminate composite 1 can be easily attached to the surface of the component or the surface of a packaging material, and the cork laminate composite 1 can be used as a design material that improves design.

[0022] [Example of adhesive layer configuration] The adhesive layer 3 includes an adhesive 3s laminated on the substrate 2. The adhesive layer 3 is formed on the surface of the substrate 2 by, for example, applying the adhesive 3s to the surface of the substrate 2. For example, a water-based binder is used for the adhesive 3s. Specifically, for example, a water-based adhesive such as Toasuisei 21 Primer (manufactured by Tohpe Corporation) is used as the adhesive 3s.

[0023] In addition to the above description, the adhesive layer 3 can be configured to include, for example, a pressure sensitive adhesive using a double-sided tape. In other words, the adhesive layer 3 is not limited in any way as long as it can adhere the cork particles 4t of the cork layer 4 to the base material 2. However, as described above, when the adhesive layer 3 is configured to include a water-based binder, it is not necessary to use a solvent in the adhesive 3s, and the adhesive 3s, and therefore the cork laminated composite 1, can be configured to be carbon neutral. This is preferable in that it makes it easy to configure the cork laminated composite 1, which can reduce the environmental impact.

[0024] [Method for manufacturing cork laminated composite] Next, a method for producing the cork laminated composite 1 of the present embodiment 1 will be specifically described with reference to Fig. 3. Fig. 3 is a flow chart showing the method for producing the cork laminated composite 1.

[0025] In the manufacturing method of the cork laminated composite 1 of the present embodiment 1, as shown in step S1 of Fig. 3, an adhesive layer forming step is first performed to form an adhesive layer 3 containing an adhesive 3s on the base material 2. In this adhesive layer forming step, for example, the adhesive 3s is applied to one surface of the sheet-like base material 2 directly or by using an application member such as a brush, so that the adhesive layer 3 containing the adhesive 3s is formed so as to cover one surface of the base material 2.

[0026] Next, as shown in step S2, a cork layer forming process is performed in which cork particles 4t are laminated on the adhesive layer 3 to form the cork layer 4. In this cork layer forming process, the cork particles 4t are sprinkled onto the adhesive 3s of the adhesive layer 3, so that the cork particles 4t come into contact with the adhesive 3s. Next, the excess cork particles 4t are shaken off from the adhesive layer 3, and then the adhesive 3s and the cork particles 4t are fixed together by heating and drying. Next, the cork particles 4t are laminated by pressing them against the adhesive layer 3 using a pressing device (not shown) such as a rolling machine or a pressing machine. As a result, in this embodiment 1, one side of the base material 2 is coated with the cork layer 4 including the adhesive layer 3 and the cork particles 4t adhered thereto, and the cork laminated composite 1 is completed.

[0027] In the cork layer forming process, the excess cork particles 4t are shaken off by, for example, vibrating the base material 2 using a vibration device (not shown), so that cork particles that are not well adhered to the adhesive 3s are removed as excess cork particles 4t. In the cork layer forming process, the cork particles 4t are firmly adhered to the adhesive 3s of the adhesive layer 3 by, for example, heating and drying at 80°C for about 10 minutes. In addition, in the cork layer forming process, the cork particles 4t are pressed against the adhesive layer 3 under a pressure condition of, for example, 10 MPa or more. As a result, in this embodiment 1, a cork laminated composite 1 can be constructed in which the cork particles 4t are unlikely to fall off.

[0028] In the above description, the excess cork particles 4t are shaken off before the heating and drying process. However, the present disclosure is not limited to this, and the shaking off process may be performed at least one of the following times: before the heating and drying process, after the heating and drying process, before the cork particles 4t are pressed, and after the cork particles 4t are pressed.

[0029] Furthermore, when the cork particles 4t are pressed in the cork layer forming step, for example, a hot press at a temperature of about 120° C. may be used, or a room temperature press at a temperature of about 30° C. or lower may be used. Specifically, the conditions for pressing the cork particles 4t can be appropriately selected depending on the application of the cork laminated composite 1 (i.e., the contents of the cork product), the material of the base material 2, the material of the adhesive layer 3, and / or the material of the cork layer 4, etc.

[0030] More specifically, hot pressing is preferred when using adhesive 3s, which contains a relatively large amount of solvent such as water and therefore requires more drying. On the other hand, when a pressure-sensitive adhesive is used for adhesive layer 3 and a paper material is used for substrate 2, room temperature pressing is preferred from the viewpoint of ensuring the strength of cork laminated composite 1.

[0031] Furthermore, in the cork layer forming process, it is preferable to use the above-mentioned hot press to compress the cork particles 4t, thereby maintaining the cork particles 4t and ensuring uniformity of the surface of the cork layer 4 and, in turn, the cork laminated composite 1. In other words, in this embodiment 1, when forming the finished cork laminated composite 1 shown in Fig. 2 from the intermediate cork laminated composite 1P shown in Fig. 1, it is possible to obtain a cork laminated composite 1 with a uniform surface.

[0032] In addition, in the manufacturing method of the cork laminated composite 1 of this embodiment 1, the cork layer forming step is carried out after the adhesive layer forming step, so that desired cork particles 4t can be provided on the base material 2 later via the adhesive layer 3, and the cork layer 4 having uniformly distributed cork particles 4t can be easily formed on the base material 2. Furthermore, the manufacturing method of the cork laminated composite 1 of this embodiment 1 is also preferable in that it is possible to easily form a cork layer 4 having more uniform cork particles 4t, compared to the comparative example in which cork particles are mixed into the adhesive and then provided on the base material.

[0033] The cork laminated composite 1 of the present embodiment 1 configured as above includes the base material 2, the adhesive layer 3 containing the adhesive 3s laminated on the base material 2, and the cork layer 4 containing the cork particles 4t laminated on the adhesive layer 3. The cork particles 4t are pressurized against the adhesive layer 3. As described above, in the cork laminated composite 1 of the present embodiment 1 and its manufacturing method, the cork particles 4t, which are pressurized against the adhesive layer 3, are attached to the base material 2 via the adhesive layer 3, so that the adhesive 3s contained in the adhesive layer 3 is prevented from appearing on the surface layer of the cork layer 4. As a result, in the cork laminated composite 1 of the present embodiment 1, unlike the conventional example, only the cork layer 4 can be exposed on the surface of the cork laminated composite 1. In other words, in the cork laminated composite 1 of the present embodiment 1, unlike the conventional example, the adhesive 3s of the adhesive layer 3 filled between the cork particles 4t is prevented from being exposed on the surface layer of the cork laminated composite 1. As a result, in the cork laminated composite 1 of the present embodiment 1 and its manufacturing method, the cork in the cork layer 4 can maintain its inherent properties.

[0034] Here, the verification test carried out by the inventors of the present disclosure will be described. In the following description, the case where only No. 1 grains were used as the cork grains 4t of the cork layer 4 will be described as Example 1, the case where only No. 2 grains were used as Example 2, and the case where No. 1 grains and No. 2 grains were used as Example 3. In Examples 1, 2, and 3, a film having a thickness of, for example, 0.1 mm was used as the substrate 2. In Examples 1, 2, and 3, the above-mentioned water-based binder was used as the adhesive 3s of the adhesive layer 3. Furthermore, as the pressurizing conditions in the pressurizing device, 54 MPa, 47 MPa, and 45 MPa were adopted in Examples 1, 2, and 3, respectively.

[0035] In Examples 1, 2, and 3, the pressing was performed at room temperature of 30° C. or less in the pressing device. The thickness of the adhesive layer 3 after pressing was 0.025 mm in Examples 1, 2, and 3. The thickness of the cork layer 4 after pressing was 0.45 mm, 0.75 mm, and 0.85 mm in Examples 1, 2, and 3, respectively.

[0036] Furthermore, in Examples 1, 2, and 3, the change in density of the cork layer 4 and the change in surface roughness of the surface (top layer) of the cork layer 4 before and after pressing were determined. The density of the cork layer 4 was measured using a caliper, a weight scale, and a sixness gauge. The surface roughness of the cork layer 4 was measured using an arithmetic mean roughness (Ra) and maximum height (Rz) using a laser microscope. The changes in density, arithmetic mean roughness (Ra), and maximum height (Rz) of the cork layer 4 in Examples 1, 2, and 3 are shown in Tables 1, 2, and 3, respectively.

[0037] [Table 1]

[0038] [Table 2]

[0039] [Table 3]

[0040] As is clear from Table 1, in Examples 1, 2, and 3, when the cork particles 4t forming the cork layer 4 were pressed against the adhesive layer 3, the density of the cork layer 4 was confirmed to be high.

[0041] As is clear from Tables 2 and 3, in Examples 1, 2, and 3, when the cork particles 4t were in a pressurized state, both the arithmetic mean roughness (Ra) and the maximum height (Rz) were confirmed to be small values.

[0042] As described above, it has been demonstrated that when the cork particles 4t are pressurized, the cork particles 4t are densely arranged without gaps in the surface layer of the cork layer 4, i.e., the surface layer of the cork laminated composite 1, and the surface layer of the cork layer 4 is flattened. In other words, it has been confirmed that the exposure of the adhesive 3s is suppressed in the surface layer of the cork laminated composite 1 of the present embodiment 1. As a result, it has been demonstrated that it is possible to manufacture a cork laminated composite 1 that can maintain the expression of the properties inherent to cork.

[0043] Specifically, in this embodiment 1, when the cork laminate composite 1 is used as an anti-slip member, it can fully exhibit anti-slip properties. When the cork laminate composite 1 is used as a heat insulating member, sound absorbing member, and / or moisture absorbing member, it can fully exhibit heat insulating properties, sound absorbing properties, and / or moisture absorbing properties. When the cork laminate composite 1 is used as a design member, it can fully exhibit excellent design properties.

[0044] [Modifications] A modified example of the present disclosure will be specifically described. This modified example differs from the first embodiment in that the base material 2 laminated with the adhesive layer 3 is stretched in the cork layer forming step shown in step S2 of FIG.

[0045] Specifically, in the cork layer forming process of this modified example, first, a stretching device (not shown) is used to stretch both ends of the base material 2 and the adhesive layer 3 formed on the base material 2 in opposite directions to stretch the base material 2 and the adhesive layer 3. Then, cork particles 4t are attached from above the adhesive layer 3, and the cork particles 4t are pressed against the adhesive layer 3 to form the cork layer 4. The base material 2 on which the cork layer 4 has been formed is then released from the stretched state.

[0046] As described above, this modification provides the same effects as the above-mentioned embodiment 1. Furthermore, in this modification, the cork particles 4t are attached to the base material 2 laminated with the adhesive layer 3 in a stretched state, so that the density of the cork particles 4t in the cork layer 4 can be made higher than in embodiment 1, improving the properties of the cork layer 4 and, ultimately, the cork laminated composite 1.

[0047] In addition to the above description, a method may also be used in which the base material 2 and adhesive layer 3 are stretched, cork particles 4t are attached from above the adhesive layer 3, and then the base material 2 and adhesive layer 3 are released from the stretched state, and the cork particles 4t are then pressed and stacked.

[0048] [Embodiment 2] The second embodiment of the present disclosure will be specifically described with reference to Figs. 4 and 5. Fig. 4 is a cross-sectional view showing an example of the configuration of the cork laminated composite 1P according to the second embodiment of the present disclosure before the cork particles 4t and 6t are pressed. Fig. 5 is a cross-sectional view showing an example of the configuration of the cork laminated composite 1 shown in Fig. 4 after the cork particles 4t and 6t are pressed. The main difference between the second embodiment and the first embodiment is that the adhesive layers 3 and 5 and the cork layers 4 and 6 are sequentially laminated (coated) on both sides of the base material 2. Note that the adhesive 3s of the adhesive layer 3 and the adhesive 5s of the adhesive layer 5 are not shown in Fig. 5.

[0049] As shown in Figures 4 and 5, the cork laminated composite 1P, 1 of this embodiment 2 includes, on one surface of the base material 2, an adhesive layer 3 having an adhesive 3s, and a cork layer 4 including cork particles 4t laminated on the adhesive layer 3, as in the embodiment 1. Also, as shown in Figure 4, in the cork laminated composite 1P, the cork particles 4t are in a state before being pressed against the adhesive layer 3, as in the case shown in Figure 1. Also, as shown in Figure 5, in the cork laminated composite 1, the cork particles 4t are in a state of being pressed against the adhesive layer 3, as in the case shown in Figure 2.

[0050] In the cork laminated composite 1 of the second embodiment, an adhesive layer 5 having an adhesive 5s and a cork layer 6 including cork particles 6t laminated on the adhesive layer 5 are laminated in this order on the other surface of the base material 2. As shown in Fig. 4, in the cork laminated composite 1P, the cork particles 6t are in a state before being pressed against the adhesive layer 5, similar to the cork particles 4t. As shown in Fig. 5, in the cork laminated composite 1, the cork particles 6t are in a state pressed against the adhesive layer 5, similar to the cork particles 4t.

[0051] The adhesive 5s may be made of the same material as the adhesive 3s, or may be made of a different material, for example. However, it is preferable to make the adhesives 3s and 5s of the same material, since this reduces the number of parts in the cork laminated composite 1 and simplifies the manufacturing method.

[0052] Additionally, both adhesive layer 3 and adhesive layer 5 can be a first adhesive layer provided on the cork layer 4 side or the cork layer 6 side, and a second adhesive layer provided on the opposite side of the base material 2 to the first adhesive layer. In other words, when adhesive layer 3 constitutes the first adhesive layer, adhesive layer 5 constitutes the second adhesive layer. On the other hand, when adhesive layer 3 constitutes the second adhesive layer, adhesive layer 5 constitutes the first adhesive layer.

[0053] The cork particles 6t are formed using at least one of size 1 particles and size 2 particles, similar to the cork particles 4t. The cork particles 6t are pressed against the adhesive layer 5 under the same pressing conditions as the cork particles 4t. However, the cork particles 6t may be pressed under pressing conditions different from those for the cork particles 4t.

[0054] In other words, in the manufacturing method of the cork laminated composite 1 of this embodiment 2, the adhesive layer forming process of adhesive layer 3 on one surface of the base material 2 and the adhesive layer forming process of adhesive layer 5 on the other surface of the base material 2 can be carried out simultaneously or successively.

[0055] In the manufacturing method of the cork laminated composite 1 of the present embodiment 2, the cork layer forming step of the cork layer 4 and the cork layer forming step of the cork layer 6 can be carried out simultaneously or consecutively. Furthermore, in the manufacturing method of the cork laminated composite 1 of the present embodiment 2, for example, after carrying out the adhesive layer forming step of the adhesive layer 3 and the cork layer forming step of the cork layer 4 on one surface of the base material 2, the adhesive layer forming step of the adhesive layer 5 and the cork layer forming step of the cork layer 6 can be carried out on the other surface of the base material 2.

[0056] When the cork layer forming process for cork layer 4 and the cork layer forming process for cork layer 6 are carried out simultaneously, the cork layer forming processes for cork layer 4 and cork layer 6 can be carried out together, for example, by embedding base material 2 on which adhesive layers 3 and 5 have been formed inside a cork particle container (not shown) filled with cork particles 4t.

[0057] Furthermore, when the cork layer forming step of the cork layer 4 and the cork layer forming step of the cork layer 6 are carried out consecutively, the corresponding cork particles 4t or 6t are sprinkled onto either the adhesive layer 3 or the adhesive layer 5 to form the corresponding cork layer 4 or the cork layer 6. Then, the corresponding cork particles 4t or 6t may be sprinkled onto the other of the adhesive layer 3 or the adhesive layer 5 to form the corresponding cork layer 4 or the cork layer 6.

[0058] The cork laminated composite 1 of the present embodiment 2 configured as described above has the same effects as those of the above embodiment 1. Moreover, in the present embodiment 2, in a cork product having the cork layers 4 and 6 provided on both sides of the base material 2, it is possible to maintain the expression of the inherent properties of the cork in the cork layers 4 and 6.

[0059] In addition to the above, the cork layer 4 or 6 may be formed only on one side of the base material 2, and the adhesive layer 3 and adhesive layer 5 (first adhesive layer and second adhesive layer) may be formed on the other side of the base material 2. In this case, the cork laminated composite 1 having the cork particles 4t or 6t pressed against the first adhesive layer by the second adhesive layer can be easily attached to a desired location. This makes it easy to expand the uses of the cork laminated composite 1, which expresses the inherent properties of cork.

[0060] [Embodiment 3] The third embodiment of the present disclosure will be described in detail with reference to Figs. 6 and 7. Fig. 6 is a cross-sectional view showing an example of the configuration of a cork laminate composite 1P according to the third embodiment of the present disclosure before the cork particles 4t are pressed. Fig. 7 is a cross-sectional view showing an example of the configuration of the cork laminate composite 1 shown in Fig. 6 after the cork particles 4t are pressed. The main difference between the third embodiment and the first embodiment is that the third embodiment is provided with a cork layer 4 on one side of the base material 2, and the base material 2 is configured to be attached to a desired location of another component.

[0061] As shown in Fig. 6 and Fig. 7, the cork laminated composite 1P, 1 of the present embodiment 3 includes a cork layer 4 including cork particles 4t, and a support material 7 on which the cork layer 4 is laminated and supports the cork layer 4. As shown in Fig. 6, in the cork laminated composite 1P, the cork particles 4t are in a state before being pressed against the adhesive layer 3, similar to that shown in Fig. 1. As shown in Fig. 7, in the cork laminated composite 1, the cork particles 4t are in a state of being pressed against the adhesive layer 3, similar to that shown in Fig. 2. The support material 7 includes a base material 7a, a first adhesive layer 7b, a second adhesive layer 7c, and a release paper 7d. Specifically, the support material 7 is formed using, for example, a double-sided tape.

[0062] The base material 7a is made of metal, film, paper, or fiber, similar to the base material 2. The first adhesive layer 7b is laminated on one surface of the base material 7a. The first adhesive layer 7b contains, for example, an adhesive 7bt, which is used as an adhesive. Furthermore, the cork layer 4 is formed on the first adhesive layer 7b, similar to the first embodiment, and the cork particles 4t are pressed against the first adhesive layer 7b.

[0063] The second adhesive layer 7c is laminated on the other surface of the base material 7a. The second adhesive layer 7c contains, for example, an adhesive 7ct as an adhesive. A detachable release paper 7d is provided on the second adhesive layer 7c. This release paper 7d can be removed from the second adhesive layer 7c by an owner such as a user when the owner installs the cork laminated composite 1 of the present embodiment 3 at a desired location. When the release paper 7d is removed, the cork laminated composite 1 of the present embodiment 3 can be attached to the desired location via the second adhesive layer 7c.

[0064] The cork laminated composite 1 of the third embodiment configured as described above has the same effects as those of the first embodiment. The third embodiment also includes a first adhesive layer 7b provided on the cork layer 4 side and a second adhesive layer 7c provided on the opposite side of the base material 7a from the first adhesive layer 7b. As a result, the cork laminated composite 1 having the cork particles 4t pressed against the first adhesive layer 7b by the second adhesive layer 7c can be easily attached to a desired location. This makes it easy to expand the uses of the cork laminated composite 1, which expresses the inherent properties of cork, in the third embodiment.

[0065] In the above description, a sheet-like cork product is configured as the cork laminated composite 1. However, the cork laminated composite 1 of the present disclosure is not limited in any way as long as it has cork particles 4t forming the cork layer 4 on at least one surface.

[0066] According to the configuration disclosed herein, even when a cork laminate composite is manufactured by laminating a cork layer containing cork particles on a substrate via an adhesive layer, it is possible to manufacture a cork product that can maintain the expression of properties inherent to cork, and therefore it is possible to significantly reduce waste generation due to deterioration of properties. Such an effect can also contribute to the achievement of Goal 12 of the Sustainable Development Goals (SDGs) advocated by the United Nations.

[0067] 〔summary〕 The cork laminate composite of the first aspect of the present disclosure comprises a substrate, an adhesive layer containing an adhesive or pressure sensitive adhesive laminated on the substrate, and a cork layer containing cork particles laminated on the adhesive layer, the cork particles being pressed against the adhesive layer.

[0068] According to the above-mentioned structure, the cork particles are attached to the base material through the adhesive layer, which is in a pressurized state, and this makes it possible to prevent the adhesive contained in the adhesive layer from appearing on the surface of the cork layer, which makes it possible to expose only the cork layer on the surface of the cork laminate composite, thereby maintaining the expression of the inherent properties of the cork.

[0069] A second aspect of the present disclosure is the cork laminate composite of the first aspect, wherein the adhesive may be a water-based binder.

[0070] According to the above-mentioned structure, since a water-based binder is used for the adhesive, it is not necessary to use a solvent for the adhesive. This allows the adhesive, and in turn the cork laminated composite to be carbon neutral. As a result, it is possible to easily produce a cork laminated composite that can reduce the environmental load.

[0071] A third aspect of the present disclosure is a cork laminated composite of the first or second aspect, wherein the adhesive layer may comprise a first adhesive layer provided on the cork layer side and a second adhesive layer provided on the substrate side opposite the first adhesive layer.

[0072] According to the above-mentioned configuration, the cork laminated composite having the cork particles pressed against the first adhesive layer by the second adhesive layer can be easily attached to a desired location, which makes it easy to expand the uses of the cork laminated composite in which the inherent properties of cork are expressed.

[0073] A fourth aspect of the present disclosure is the cork laminate composite of any one of the first to third aspects, wherein the base material may be a flexible material having flexibility.

[0074] According to the above-mentioned configuration, a flexible cork laminated composite can be easily constructed, and the cork laminated composite can be easily attached to other members, etc.

[0075] A fifth aspect of the present disclosure relates to a method for producing a cork laminated composite comprising a cork layer, and includes an adhesive layer forming step of forming an adhesive layer containing an adhesive or pressure sensitive adhesive on a base material, and a cork layer forming step of laminating cork particles on the adhesive layer to form the cork layer. In the cork layer forming step, the cork particles are laminated by applying pressure to the adhesive layer.

[0076] According to the above-mentioned configuration, the cork particles are pressed against the adhesive layer in the cork layer forming step and laminated onto the adhesive layer, which prevents the adhesive contained in the adhesive layer from appearing on the surface of the cork layer, making it possible to expose only the cork layer on the surface of the cork laminate composite, thereby maintaining the expression of the inherent properties of cork.

[0077] A sixth aspect of the present disclosure is a method for producing the cork laminated composite of the fifth aspect, wherein in the cork layer forming step, the base material on which the adhesive layer is laminated is in a stretched state, the cork particles are attached to the adhesive layer, and then (i) the cork particles are pressed against the adhesive layer to laminate them, and then the stretched state of the base material is released, or (ii) the base material is released from the stretched state, and the cork particles are pressed against the adhesive layer to laminate them.

[0078] According to the above-mentioned configuration, the density of the cork particles in the cork layer can be increased, thereby improving the properties of the cork layer and, ultimately, the cork laminate composite.

[0079] The present disclosure is not limited to the above-described embodiments and modifications, and various modifications are possible within the scope of the claims. Configurations obtained by appropriately combining the technical means disclosed in the embodiments and modifications are also included in the technical scope of the present disclosure. [Industrial Applicability]

[0080] The present disclosure can be utilized in cork laminate composites as cork products that include cork grains forming a cork layer. [Explanation of symbols]

[0081] 1. Cork laminate composite 2, 7a Base material 3s, 5s adhesive 3, 5 Adhesive layer (1st adhesive layer, 2nd adhesive layer) 7bt, 7ct adhesive 7b 1st adhesive layer 7c 2nd adhesive layer 4t, 6t cork grains 4, 6 Cork layers

Claims

1. A substrate; an adhesive layer including an adhesive or a pressure sensitive adhesive laminated on the substrate; a cork layer including cork particles laminated on the adhesive layer, The cork grains are pressed against the adhesive layer.

2. 2. The cork laminated composite according to claim 1, wherein the adhesive comprises a water-based binder.

3. 2. The cork laminated composite according to claim 1, wherein the adhesive layer comprises a first adhesive layer provided on the cork layer side and a second adhesive layer provided on the substrate opposite the first adhesive layer.

4. 4. The cork laminated composite according to claim 1, wherein the base material is made of a flexible material having flexibility.

5. 1. A method for producing a cork laminate composite comprising the steps of: An adhesive layer forming step of forming an adhesive layer containing an adhesive or pressure-sensitive adhesive on a substrate; and a cork layer forming step of laminating cork particles on the adhesive layer to form a cork layer. In the cork layer forming step, The cork particles are laminated by applying pressure to the adhesive layer.

6. In the cork layer forming step, The base material on which the adhesive layer is laminated is stretched, and the cork particles are attached to the adhesive layer. (i) pressing the cork particles against the adhesive layer to laminate them together, and then releasing the stretched state of the substrate; or 6. The method of claim 5, further comprising the steps of: (ii) releasing the base material from its stretched state, and then pressing the cork particles against the adhesive layer to laminate the cork particles.

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