Joint mats

Abstract

The present invention provides a joint mat that is easy to dispose of, ensures a certain level of strength, and suppresses the generation of odors from solvents, etc. [Solution] The joint mat 1 comprises a first corrugated cardboard sheet 10 and a second corrugated cardboard sheet 20, and a laminated mat 30 is formed by laminating the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20. The laminated mat 30 has connecting parts 40 on each side of its outer circumference that can be connected to other laminated mats 30, and the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 are formed with different thicknesses, and the first core 14 of the first corrugated cardboard sheet 10 and the second core 24 of the second corrugated cardboard sheet 20 are arranged in the same formation direction, and the laminated mats 30 can be connected to each other such that the first core 14 and the second core 24 of the multiple laminated mats 30 are arranged in a direction intersecting the formation direction.

Description

Technical Field

[0001] The present invention relates to a joint mat for laying on floors, ground, etc.

Background Art

[0002] Conventionally, in floors in homes, facilities, etc., a connectable joint mat has been used for protecting the floor surface from damage and dirt, for cushioning purposes, etc. Conventional joint mats are formed using a resin such as urethane. However, resin joint mats have problems such as sick house problems caused by solvents, etc. and problems with difficult disposal. Also, in homes with pets such as dogs and cats, it is necessary to frequently clean the laid joint mat due to pet excrement, etc. Therefore, a joint mat that can be easily replaced and has a certain strength is desired. Also, in kitchens, food trucks, etc., from the viewpoints of preventing dirt from oil on the floor surface and slips, a joint mat that can be easily replaced, is easy to dispose of, and has a certain strength is desired. Similarly, in campsites, etc., a joint mat that is easy to dispose of and has a certain strength is desired. Therefore, a cardboard joint part (equivalent to a joint mat) made of cardboard for use in facilities during disasters has been disclosed (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the joint cardboard parts described in Patent Document 1, while easy to dispose of, were insufficient in terms of strength. Furthermore, the joint cardboard parts described in Patent Document 1 had the problem that the engagement strength of the protrusions and indentations at the connection part could not be ensured, resulting in damage or deformation of the connection part. In addition, the joint cardboard parts described in Patent Document 1 had the problem that the engagement of the joint cardboard parts could not be ensured, causing them to detach and fall off.

[0005] Therefore, the present invention aims to provide a joint mat that is easy to dispose of, ensures a certain level of strength, and suppresses the generation of odors from solvents, etc. [Means for solving the problem]

[0006] (1) The joint mat of the present invention, provided to solve the above-mentioned problems, comprises a first corrugated cardboard sheet having a rectangular shape and a second corrugated cardboard sheet formed to be substantially the same shape as the first corrugated cardboard sheet, wherein a laminated mat is formed by directly or indirectly laminating the first corrugated cardboard sheet and the second corrugated cardboard sheet, and the laminated mat is provided with connecting parts on each side of its outer circumference that can be connected to other laminated mats.

[0007] The joint mats of the present invention are made of cardboard material, which suppresses the generation of odors from solvents, etc., and also reduces the environmental burden of disposal. Furthermore, because the joint mats of the present invention are made of cardboard material, they can absorb oil, etc., even if they adhere to them when used in places such as kitchens or food trucks, and can be easily replaced and disposed of. In addition, when used in places such as campsites, the joint mats of the present invention can be easily disposed of by incineration, etc., which reduces the burden of luggage.

[0008] Furthermore, by configuring the joint mat of the present invention as described in (1) above, it can be formed as a two-layer laminated mat consisting of a first corrugated cardboard sheet and a second corrugated cardboard sheet. This allows the joint mat of the present invention to be formed with an appropriate thickness, and the load received from the upper corrugated cardboard sheet (e.g., the first corrugated cardboard sheet) to be distributed to the lower corrugated cardboard sheet (e.g., the second corrugated cardboard sheet). Therefore, the joint mat of the present invention can be made stronger and more durable. In addition, by configuring the joint mat of the present invention as described in (1) above, connections at the joint can be made secure, and the thickness of the joint can be ensured, thereby improving the strength of the joint. Here, it is preferable that the laminated mat be made with a thickness of, for example, 8 mm. This ensures the strength of the joint, so that the joint mat of the present invention can be made stronger while ensuring connectivity.

[0009] (2) The joint mat of the present invention described above is preferably characterized in that the first corrugated cardboard sheet and the second corrugated cardboard sheet are formed with different thicknesses.

[0010] The joint mat of the present invention, when configured as described in (2) above, can be made lighter and its strength can be expected to be further improved. Furthermore, the joint mat of the present invention, when configured as described in (2) above, can have enhanced cushioning properties. Here, it is preferable that one of the first corrugated cardboard sheet and the second corrugated cardboard sheet be made of 3 mm and the other of 5 mm. Also, it is preferable that the laminated mat be laid so that the thinner corrugated cardboard sheet (for example, the first corrugated cardboard sheet) is located on the upper layer side and the thicker corrugated cardboard sheet (for example, the second corrugated cardboard sheet) is located on the lower layer side.

[0011] (3) In the joint mat of the present invention described above, the laminated mat is characterized in that the first core pitch of the first core in the first corrugated sheet and the second core pitch of the second core in the second corrugated sheet are formed at different pitches, and the first core and the second core are arranged in the same formation direction.

[0012] The joint mat of the present invention, by being configured as described in (3) above, allows the formation direction of the first core in the first corrugated sheet and the second core in the second corrugated sheet to be aligned. As a result, the joint mat of the present invention can increase the strength of the laminated mat. Here, if the upper layer of the laminated mat is the first corrugated sheet and the lower layer is the second corrugated sheet, it is preferable that the pitch of the second core is larger than the pitch of the first core. As a result, when a load is applied from above the laminated mat, the joint mat of the present invention can distribute and propagate the load received by the first core on the upper layer to the second core on the lower layer. Therefore, the joint mat of the present invention can improve the strength of the laminated mat.

[0013] (4) In the joint mat of the present invention described above, the laminated mat is characterized in that the first core in the first corrugated sheet and the second core in the second corrugated sheet are arranged in the same formation direction, and the laminated mats can be connected to each other such that the first core and the second core in a plurality of laminated mats are arranged in a direction intersecting the formation direction.

[0014] The joint mat of the present invention, when configured as described in (4) above, distributes the load on each connected corrugated cardboard sheet. As a result, the joint mat of the present invention can improve the strength and durability of a joint mat laid by combining multiple corrugated cardboard sheets. Furthermore, because the load on the corrugated cardboard sheets is distributed, deformation and damage to the corrugated cardboard sheets can be suppressed. In addition, when the joint mat of the present invention is configured as described in (4) above, the formation direction of the core at the connection point of each corrugated cardboard sheet is different, which increases the stability of the connection point and improves the strength of the connection point.

[0015] (5) The joint mat of the present invention described above is made of a rectangular corrugated cardboard sheet, the corrugated cardboard sheet has connecting parts on each side of its outer circumference that can be connected to other corrugated cardboard sheets, the connecting parts have a plurality of protrusions and recesses that can engage with each other with the other corrugated cardboard sheets, and the plurality of protrusions and recesses are formed with the same pitch in the width direction.

[0016] The joint mat of the present invention, when configured as described in (5) above, allows for easy formation of a laminated mat (joint mat). Furthermore, the joint mat of the present invention, when configured as described in (5) above, allows for even distribution of the load on the uneven parts when connected. As a result, the joint mat of the present invention has improved strength at the connection points.

[0017] (6) The joint mat of the present invention, provided to solve the above-mentioned problems, comprises a first corrugated cardboard sheet having a rectangular shape and a second corrugated cardboard sheet formed to be substantially the same shape as the first corrugated cardboard sheet, wherein a laminated mat is formed by directly or indirectly laminating the first corrugated cardboard sheet and the second corrugated cardboard sheet, the laminated mat has connecting parts on each side of its outer circumference that can be connected to other laminated mats, the first corrugated cardboard sheet and the second corrugated cardboard sheet are formed to be different thicknesses from each other, the first core of the first corrugated cardboard sheet and the second core of the second corrugated cardboard sheet are arranged in the same formation direction from each other, and the laminated mats can be connected to each other such that the first core and the second core of a plurality of laminated mats are arranged in a direction intersecting the formation direction.

[0018] The joint mat of the present invention, when configured as described in (6) above, can be made lighter and its strength can be expected to be further improved. Furthermore, the joint mat of the present invention, when configured as described in (6) above, can have enhanced cushioning properties. Here, the laminated mat is preferably formed with a thickness of, for example, 8 mm. This ensures the strength of the connection part of the joint mat of the present invention, thus ensuring connectivity while also ensuring the strength of the laminated mat. Furthermore, it is preferable that one of the first corrugated cardboard sheet and the second corrugated cardboard sheet is formed with a thickness of 3 mm and the other with a thickness of 5 mm. In addition, the laminated mat is preferably laid so that the thinner corrugated cardboard sheet (for example, the first corrugated cardboard sheet) is located on the upper layer side and the thicker corrugated cardboard sheet (for example, the second corrugated cardboard sheet) is located on the lower layer side.

[0019] Furthermore, by configuring the joint mat of the present invention as shown in (6), the load on each connected corrugated cardboard sheet is distributed. As a result, the joint mat of the present invention can improve the strength and durability of a joint mat laid by combining multiple corrugated cardboard sheets. In addition, by distributing the load on the corrugated cardboard sheets, the joint mat of the present invention can suppress deformation and damage to the corrugated cardboard sheets. Furthermore, by configuring the joint mat of the present invention as shown in (6) above, the formation direction of the core at the connection part of each corrugated cardboard sheet is different, which increases the stability of the connection part and improves the strength of the connection part.

[0020] (7) The joint mat of the present invention, provided to solve the above-mentioned problems, is made of a rectangular corrugated cardboard sheet, the corrugated cardboard sheet is provided with connecting parts on each side of the outer circumference that can be connected to other corrugated cardboard sheets, the connecting parts have a plurality of protrusions and recesses that can engage with each other with the other corrugated cardboard sheets, the plurality of protrusions and recesses have at least one large-pitch protrusion and recess with a large pitch in the width direction and at least one small-pitch protrusion and recess with a pitch in the width direction smaller than that of the large-pitch protrusion and recess.

[0021] The joint mat of the present invention, by being configured as described in (5) above, allows for the arrangement of a mixture of small-pitch and large-pitch uneven sections. This enables stable connection of the joint mat of the present invention. Furthermore, because the joint mat of the present invention allows for the arrangement of a mixture of small-pitch and large-pitch uneven sections, the connection positions can be easily aligned based on the large-pitch uneven sections. This improves the connectability of the joint mat of the present invention. In addition, by being configured as described in (5) above, the uneven sections in the corrugated cardboard sheet can be easily formed by punching with a die-cutting blade, for example.

[0022] (8) The joint mat of the present invention described above is characterized in that the small-pitch concavo-convex portions are arranged inside the large-pitch concavo-convex portions along the side direction of the cardboard sheet.

[0023] By configuring the joint mat of the present invention as described in (8) above, the small-pitch concavo-convex portions can be arranged inside the large-pitch concavo-convex portions, so that the connection position can be easily positioned. As a result, the joint mat of the present invention can improve the connectivity. Further, by configuring the joint mat of the present invention as described in (8) above, the small-pitch concavo-convex portions and the large-pitch concavo-convex portions can be arranged in a mixed manner. Thereby, the joint mat of the present invention can be stably connected.

[0024] (9) The joint mat of the present invention described above has corner concavo-convex portions that constitute at least a part of the connection portion formed at each of the four corners of the cardboard sheet. When four adjacent cardboard sheets are connected in a rectangular shape via the corner concavo-convex portions, the respective corners are abutted and the corresponding corner concavo-convex portions are connected to each other, so that each side of the corner concavo-convex portions at the intersection of the corners intersects in an X shape. It is good to be characterized by this.

[0025] By configuring the joint mat of the present invention as described in (9) above, each side of each cardboard sheet can be connected so as to be aligned linearly with respect to the adjacent cardboard sheet. As a result, the joint mat of the present invention can, for example, combine and connect four cardboard sheets in a square shape when the four cardboard sheets are each formed in a square shape. Therefore, the joint mat of the present invention can be used in a large area while expanding four cardboard sheets in a square shape. Further, by configuring the joint mat of the present invention as described in (9) above, even when changing the pitch of the concavo-convex portions, the corner concavo-convex portions having the same unified shape can be used, so that the pitch change of the concavo-convex portions can be easily performed.

[0026] (10) The joint mat of the present invention described above is characterized in that the cardboard sheets can be connected to each other such that the core forming directions in the plurality of cardboard sheets intersect with the core forming directions of other adjacent cardboard sheets.

[0027] By configuring the joint mat of the present invention as described in (10) above, the load applied to each cardboard sheet is dispersed. As a result, the joint mat of the present invention can improve the strength and durability of the joint mat laid by combining a plurality of cardboard sheets. Further, the joint mat of the present invention can suppress deformation and breakage of the cardboard sheet because the load applied to the cardboard sheet is dispersed. Further, by configuring the joint mat of the present invention as described in (10) above, since the core forming directions of the connection (joint) portions of the cardboard sheets with each other are different, the stability of the connection portion is enhanced and the strength of the connection portion is improved.

[0028] (11) The joint mat of the present invention described above is composed of the cardboard sheet and has an outer edge member that can be connected to the cardboard sheet via the connection portion. In a state where a plurality of the cardboard sheets are connected to each other, at least one of the outer edge members can be connected to the outer periphery of the cardboard sheet via the connection portion, which is characterized as being good.

[0029] By configuring the joint mat of the present invention as described in (11) above, when a plurality of cardboard sheets are connected, it is possible to suppress the cardboard sheet located at the outer edge from lifting. Further, by forming the outer peripheral edge of the outer edge member linearly, the outer peripheral edge of the outer edge member can be arranged in close contact with a wall surface of a room or the like. As a result, it is possible to expect an improvement in the fitting feeling of the joint mat of the present invention to a room or the like.

[0030] (12) The joint mat of the present invention described above is preferably characterized in that the direction of formation of the core of the outer edge member connected to the corrugated cardboard sheet intersects with the direction of formation of the core of the corrugated cardboard sheet.

[0031] By configuring the joint mat of the present invention as described in (12) above, the formation direction of the core of the corrugated cardboard sheet and the formation direction of the core of the outer edge member intersect with each other, thereby suppressing the peeling of the backing paper in the corrugated cardboard sheet.

[0032] (13) The joint mat of the present invention described above is made of a rectangular corrugated cardboard sheet, the corrugated cardboard sheet has connecting parts on each side of the outer circumference that can be connected to other corrugated cardboard sheets, the connecting parts have a plurality of protrusions and recesses that can engage with each other with the other corrugated cardboard sheets, at least one of the protrusions and recesses has a return part, the return part is characterized in that the protruding end side of the protrusion in the protrusion is expanded in the width direction, the base end side of the protrusion is reduced in the width direction, the opening end side of the recess in the protrusion is reduced, and the bottom side of the recess is expanded.

[0033] The joint mat of the present invention, when configured as described in (13) above, can prevent the interlocking of the protrusions and recesses from disengaging and the corrugated cardboard sheets from falling off when multiple corrugated cardboard sheets are connected. Here, the return allowance of the return portion can be adjusted by adjusting the amount of expansion in the width direction of the protruding end of the convex portion and the amount of reduction of the opening end of the concave portion (the amount of expansion in the width direction of the bottom of the concave portion). This makes it possible to adjust the degree of interlocking between the protrusions and recesses at the return portion. [Effects of the Invention]

[0034] According to the present invention, it is possible to provide a joint mat that is easy to dispose of, ensures a certain level of strength, and suppresses the generation of odors from solvents, etc. [Brief explanation of the drawing]

[0035] [Figure 1] This is a plan view of a joint mat according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view taken in the direction of arrow AA in Figure 1. [Figure 3] This is a plan view showing a state in which multiple joint mats according to one embodiment of the present invention are connected together. [Figure 4] Figure 3 is an enlarged plan view of the main part. [Figure 5] This is a plan view showing the connection state using the outer edge member of the joint mat according to the first modified example of the present invention. [Figure 6] This is a plan view of a joint mat according to a second modified example of the present invention. [Figure 7] This is a plan view showing the connection state of the joint mat according to a second modified example of the present invention. [Figure 8] This is a cross-sectional view of another embodiment of a corrugated sheet that can be used in the joint mat of the present invention. [Modes for carrying out the invention]

[0036] The following describes in detail a joint mat 1 according to one embodiment of the present invention, with reference to the drawings. Please note that the figures are schematic representations for ease of understanding and may differ from the actual dimensions. Also, in each figure, if there are multiple similar components, some reference numerals may be omitted.

[0037] As shown in Figure 1, the joint mat 1 is formed in a rectangular shape (square shape in this embodiment) in a plan view. The joint mat 1 is made from corrugated cardboard. As shown in Figure 2, the joint mat 1 comprises a laminated mat 30 formed by laminating an upper first corrugated cardboard sheet 10 and a lower second corrugated cardboard sheet 20 in a cross section in the AA direction. The joint mat 1 also has connecting parts 40 (see Figure 1) on each side of the outer circumference of the laminated mat 30.

[0038] The first corrugated cardboard sheet 10 comprises a first backing sheet 12 (also referred to as the first liner 12) on the surface side (top side) and a first core 14. The first corrugated cardboard sheet 10 is formed in a rectangular shape (square in this embodiment) when viewed from above (see Figure 1). The first corrugated cardboard sheet 10 has a structure in which the first core 14 is sandwiched between the first backing sheet 12 and a third backing sheet 32 ​​(also referred to as the third liner 32) which is placed between the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20. In this embodiment, the first corrugated cardboard sheet 10 is formed to have a thickness d1 of approximately 3 mm.

[0039] The first core 14 is formed by curving the backing paper so that it is wavy in the vertical direction, as shown in the cross-sectional view in direction AA in Figure 2. The wave pitch in the width direction of the first core 14 (also referred to as the first core pitch P1) and the wave pitch of the second core 24 (also referred to as the second core pitch P2), which will be described later, are formed to be different from each other. In other words, the first core 14 and the second core 24 are formed with different numbers of layers. In this embodiment, the wave pitch in the width direction of the first core 14 is formed to be smaller than that of the second core 24, which will be described later. The height of the first core 14 is formed to be, for example, 2.38 mm. The wavy upper end portion of the first core 14 is glued to the back side of the first backing paper 12, and the wavy lower end portion is glued to the third backing paper 32. Here, the first core 14 is glued to the first backing paper 12 and the third backing paper 32 with an adhesive (for example, starch glue).

[0040] The second corrugated cardboard sheet 20 comprises a second backing sheet 22 (also referred to as the second liner 22) on the back side (bottom side) and a second core 24. The second corrugated cardboard sheet 20 is formed in a rectangular shape (square shape in this embodiment) that is approximately the same shape as the first corrugated cardboard sheet 10. The second corrugated cardboard sheet 20 has a structure in which the second core 24 is sandwiched between the second backing sheet 22 and the third backing sheet 32. That is, in this embodiment, the third backing sheet 32 ​​is shared as a liner for both the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20. In this embodiment, the thickness d2 of the second corrugated cardboard sheet 20 is formed to be approximately 5 mm. That is, in this embodiment, the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 are formed with different thicknesses.

[0041] The second core 24 is formed by curving the backing paper so that it is wavy in the vertical direction when viewed in a cross-sectional view in the AA direction. The second core 24 is formed such that the pitch of the waves in the horizontal direction is larger than that of the first core 14. The second core 24 is formed so that its height is, for example, 4.76 mm. The wavy upper end of the second core 24 is bonded to the back side of the third backing paper 32, and the wavy lower end is bonded to the second backing paper 22. Here, the second core 24 is bonded to the third backing paper 32 and the second backing paper 22 with an adhesive (for example, starch paste). As a result, the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 are indirectly bonded together via the third backing paper 32 to form the laminated mat 30. In this way, the joint mat 1 is made of corrugated cardboard material and the bonding is done with starch paste, so the environmental impact can be reduced. In addition, while various adhesives other than starch paste can be used to bond the backing paper and core of the joint mat 1, it is desirable to use an adhesive that does not use organic solvents, etc., from the perspective of reducing environmental impact.

[0042] As shown in Figure 1, the laminated mat 30 is provided with connecting parts 40 on each side of its outer periphery that can be connected to other laminated mats 30. As described above, the laminated mat 30 is formed with a first core pitch P1 of the first core 14 in the first corrugated cardboard sheet 10 and a second core pitch P2 of the second core 24 in the second corrugated cardboard sheet 20 that are different from each other. In addition, the first core 14 and the second core 24 of the laminated mat 30 are arranged side by side in the same direction Y (also referred to as the first forming direction Y).

[0043] The connecting portion 40 is formed on each side of the outer circumference of each laminated mat 30 in order to connect (link) one laminated mat 30 (joint mat 1) to another laminated mat 30 (joint mat 1). The connecting portion 40 has a plurality of protrusions and recesses 42 that can engage with each other with the other laminated mat 30. As shown in Figure 3, the protrusions and recesses 42 on one laminated mat 30 can be engaged with the protrusions and recesses 42 on the other laminated mat 30 to connect one laminated mat 30 to the other laminated mat 30.

[0044] In this embodiment, the uneven surface 42 of a single laminated mat 30 includes at least one large-pitch uneven surface 42L with a large pitch in the width direction and at least one small-pitch uneven surface 42S with a pitch in the width direction smaller than that of the large-pitch uneven surface 42L. Furthermore, in this embodiment, the small-pitch uneven surface 42S is positioned inward along the edge direction of the laminated mat 30 compared to the large-pitch uneven surface 42L.

[0045] Furthermore, each of the uneven portions 42 (large-pitch uneven portion 42L and small-pitch uneven portion 42S) has a return portion 43 formed thereon. The return portion 43 is formed by widening the protruding end side of the convex portion in the uneven portion 42 in the width direction, and narrowing the base end side of the convex portion in the width direction. The return portion 43 is also formed by narrowing the opening end side of the concave portion in the width direction, and widening the bottom side of the concave portion in the width direction. In other words, the return portion 43 is formed to be inclined at an acute angle with respect to the engagement direction of the uneven portion 42, thereby suppressing movement of the uneven portion 42 in the engagement direction. Therefore, the return portion 43 can suppress the disengagement of the uneven portions 42 that are engaged with each other.

[0046] As shown in Figure 3, when connecting multiple laminated mats 30, the first core 14 and the second core 24 can be arranged in a direction intersecting the first forming direction Y (also referred to as the second forming direction X) to connect the laminated mats 30 to each other. In this embodiment, the first forming direction Y and the second forming direction X are set to be perpendicular to each other.

[0047] As shown in Figures 1 and 4, corner protrusions 44 are formed at each of the four corners 2 of the laminated mat 30 (first corrugated cardboard sheet 10 and second corrugated cardboard sheet 20), forming at least a part of the connecting portion 40. When four adjacent laminated mats 30 are connected in a rectangular shape (square shape in this embodiment) via the corner protrusions 44, the respective corners 2 are brought together and the corresponding corner protrusions 44 are connected, so that the sides of each corner protrusion 44 at the intersection of the corners 2 intersect in an X shape. Therefore, as shown in Figure 1, by engaging the corner protrusions 44 of the four laminated mats 30, the four laminated mats 30 are connected (linked) so that they form a rectangular shape (square shape in this embodiment) as a whole. Note that each corner protrusion 44 has a return portion 43 formed thereon, similar to the protrusions 42 described above.

[0048] The above describes the configuration of the joint mat 1 according to one embodiment of the present invention, and the effects of the joint mat 1 of the present invention will be described below. The joint mat 1 embodying the present invention, as illustrated in the above embodiment, has the characteristic configuration shown in (A) to (D), (F) to (J), and (M) below, thereby achieving the effects unique to the present invention.

[0049] (A) The joint mat 1 according to the above embodiment comprises a rectangular first corrugated cardboard sheet 10 and a second corrugated cardboard sheet 20 formed to be substantially the same shape as the first corrugated cardboard sheet 10, and a laminated mat 30 is formed by directly or indirectly laminating the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20, and the laminated mat 30 is characterized in that each side of the outer circumference is provided with a connecting portion 40 that can be connected to other laminated mats 30.

[0050] The joint mat 1 of the present invention is made of cardboard material, which suppresses the generation of odors from solvents, etc., and also reduces the environmental burden of disposal. Furthermore, because the joint mat 1 of the present invention is made of cardboard material, it can absorb oil, etc., even if it adheres to it when used in a kitchen or food truck, for example, and can be easily replaced and disposed of. In addition, the joint mat 1 of the present invention can be easily disposed of by incineration, etc., when used in a campsite, for example, which reduces the burden of carrying luggage.

[0051] Furthermore, by configuring the joint mat 1 of the present invention as described in (A) above, it can be formed as a two-layer laminated mat 30 consisting of a first corrugated cardboard sheet 10 and a second corrugated cardboard sheet 20. This allows the joint mat 1 of the present invention to be formed with an appropriate thickness and to distribute the load received from the upper corrugated cardboard sheet (e.g., the first corrugated cardboard sheet 10) to the lower corrugated cardboard sheet (e.g., the second corrugated cardboard sheet 20). Therefore, the joint mat 1 of the present invention can be made stronger and more durable. Also, by configuring the joint mat 1 of the present invention as described in (A) above, the connection at the joint portion 40 can be made secure and the thickness of the joint portion 40 can be ensured, thereby improving the strength of the joint portion 40. Here, it is preferable that the laminated mat 30 be formed with a thickness of, for example, 8 mm. This ensures the strength of the joint mat 1 of the present invention at the joint portion 40, thus ensuring connectivity while also ensuring the strength of the laminated mat 30.

[0052] (B) The joint mat 1 according to the above embodiment is characterized in that the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 are formed with different thicknesses.

[0053] The joint mat 1 of the present invention, when configured as described in (B) above, can be made lighter and its strength can be expected to be further improved. Furthermore, the joint mat 1 of the present invention, when configured as described in (B) above, can have enhanced cushioning properties. Here, it is preferable that one of the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 is made of 3 mm and the other of 5 mm. Also, as in the embodiment described above, it is preferable to lay the laminated mat 30 so that the corrugated cardboard sheet with the thinner side (for example, the first corrugated cardboard sheet 10) is located on the upper layer side and the corrugated cardboard sheet with the thicker side (for example, the second corrugated cardboard sheet 20) is located on the lower layer side.

[0054] (C) In the joint mat 1 according to the above embodiment, the laminated mat 30 is characterized in that the first core pitch P1 of the first core 14 in the first corrugated sheet 10 and the second core pitch P2 of the second core 24 in the second corrugated sheet 20 are formed at different pitches, and the first core 14 and the second core 24 are arranged side by side in the first forming direction.

[0055] The joint mat 1 of the present invention, when configured as shown in (C) above, allows the formation direction of the first core 14 in the first corrugated sheet 10 and the second core 24 in the second corrugated sheet 20 to be aligned. As a result, the joint mat 1 of the present invention can increase the strength of the laminated mat 30. Here, if the upper layer of the laminated mat 30 is the first corrugated sheet 10 and the lower layer is the second corrugated sheet 20, it is preferable that the second core pitch P2 is formed at a larger pitch than the first core pitch P1. As a result, when a load is applied from above to the laminated mat 30, the joint mat 1 of the present invention can distribute and propagate the load received by the first core 14 on the upper layer to the second core 24 on the lower layer. Therefore, the joint mat 1 of the present invention can improve the strength of the laminated mat 30.

[0056] (D) In ​​the joint mat 1 according to the above embodiment, the laminated mat 30 is characterized in that the first core 14 in the first corrugated sheet 10 and the second core 24 in the second corrugated sheet 20 are arranged in the same formation direction, and the laminated mats 30 can be connected to each other such that the first core 14 and the second core 24 in the multiple laminated mats 30 are arranged in a direction intersecting the formation direction.

[0057] The joint mat 1 of the present invention, when configured as described in (D) above, distributes the load on each connected corrugated cardboard sheet. As a result, the joint mat 1 of the present invention can improve the strength and durability of the joint mat 1 laid by combining multiple corrugated cardboard sheets. Furthermore, because the load on the corrugated cardboard sheets is distributed, deformation and damage to the corrugated cardboard sheets can be suppressed. In addition, the joint mat 1 of the present invention, when configured as described in (D) above, has different formation directions for the core of the connecting portion 40 of each corrugated cardboard sheet, which increases the stability of the connecting portion 40 and improves the strength of the connecting portion 40.

[0058] (F) The joint mat 1 according to the above embodiment comprises a rectangular first corrugated cardboard sheet 10 and a second corrugated cardboard sheet 20 formed in substantially the same shape as the first corrugated cardboard sheet 10, wherein a laminated mat 30 is formed by directly or indirectly laminating the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20, the laminated mat 30 is provided with connecting parts 40 on each side of its outer circumference that can be connected to other laminated mats 30, the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 are formed with different thicknesses, the first core 14 in the first corrugated cardboard sheet 10 and the second core 24 in the second corrugated cardboard sheet 20 are arranged in the same formation direction, and the laminated mats 30 can be connected to each other such that the first core 14 and the second core 24 in a plurality of laminated mats 30 are arranged in a direction intersecting the formation direction.

[0059] The joint mat 1 of the present invention, when configured as described in (F) above, can be made lighter and its strength can be expected to be further improved. Furthermore, the joint mat 1 of the present invention, when configured as described in (F) above, can have enhanced cushioning properties. Here, the laminated mat 30 is preferably formed with a thickness of, for example, 8 mm. This ensures the strength of the connecting portion 40 of the joint mat 1 of the present invention, thus ensuring connectivity while also ensuring the strength of the laminated mat 30. Furthermore, the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 are preferably formed with one being 3 mm thick and the other being 5 mm thick. In addition, the laminated mat 30 is preferably laid so that the thinner corrugated cardboard sheet (for example, the first corrugated cardboard sheet 10) is located on the upper layer side and the thicker corrugated cardboard sheet (for example, the second corrugated cardboard sheet 20) is located on the lower layer side.

[0060] Furthermore, by configuring the joint mat 1 of the present invention as shown in (F), the load on each connected corrugated cardboard sheet is distributed. As a result, the joint mat 1 of the present invention can improve the strength and durability of the joint mat 1 laid by combining multiple corrugated cardboard sheets. In addition, by distributing the load on the corrugated cardboard sheets, the joint mat 1 of the present invention can suppress deformation and damage to the corrugated cardboard sheets. Furthermore, by configuring the joint mat 1 of the present invention as shown in (F) above, the formation direction of the core of the connection portion 40 of each corrugated cardboard sheet is different, which increases the stability of the connection portion 40 and improves the strength of the connection portion 40.

[0061] (G) The joint mat 1 according to the above embodiment is made of a rectangular corrugated cardboard sheet 50, and the corrugated cardboard sheet 50 is provided with connecting parts 40 on each side of its outer circumference that can be connected to other corrugated cardboard sheets 50, and the connecting parts 40 have a plurality of protrusions and recesses 42 that can engage with each other with other corrugated cardboard sheets 50, and the plurality of protrusions and recesses 42 are characterized in that they have at least one large-pitch protrusions and recesses 42L with a large pitch in the width direction and at least one small-pitch protrusions and recesses 42S with a pitch in the width direction smaller than that of the large-pitch protrusions and recesses 42L.

[0062] The joint mat 1 of the present invention, when configured as described in (E) above, allows for the arrangement of small-pitch uneven sections 42S and large-pitch uneven sections 42L in a mixed manner. This enables stable connection of the joint mat 1 of the present invention. Furthermore, since the joint mat 1 of the present invention allows for the arrangement of small-pitch uneven sections 42S and large-pitch uneven sections 42L in a mixed manner, the connection position can be easily aligned based on the large-pitch uneven sections 42L. This improves the connectability of the joint mat 1 of the present invention. In addition, when the joint mat 1 of the present invention is configured as described in (E) above, the uneven sections 42 in the corrugated cardboard sheet 50 can be easily formed by punching with a die-cutting blade, for example.

[0063] (H) The joint mat 1 according to the above embodiment is characterized in that the small-pitch uneven portion 42S is arranged inward along the edge direction of the corrugated cardboard sheet 50, compared to the large-pitch uneven portion 42L.

[0064] By configuring the joint mat 1 of the present invention as described in (H) above, the small-pitch uneven portion 42S can be positioned inward of the large-pitch uneven portion 42L, making it easy to position the connection point. This improves the connectability of the joint mat 1 of the present invention. Furthermore, by configuring the joint mat 1 of the present invention as described in (H) above, the small-pitch uneven portion 42S and the large-pitch uneven portion 42L can be arranged in a mixed manner. This allows the joint mat 1 of the present invention to be connected stably.

[0065] (I) The joint mat 1 according to the above embodiment is characterized in that, when four adjacent corrugated cardboard sheets 50 are connected in a rectangular shape via the corner protrusions 44, the respective corners 2 are brought together and the corresponding corner protrusions 44 are connected to each other, so that the sides of the respective corner protrusions 44 at the intersection of the corners 2 intersect in an X shape.

[0066] The joint mat 1 of the present invention, when configured as described in (I) above, can be connected such that each side of each corrugated cardboard sheet 50 is aligned linearly with the adjacent corrugated cardboard sheet 50. As a result, the joint mat 1 of the present invention can be used to connect four corrugated cardboard sheets 50 in a square shape, for example, when four corrugated cardboard sheets 50 are each formed in a square shape. Therefore, the joint mat 1 of the present invention can be used to expand the area by using four corrugated cardboard sheets 50 in a square shape. Furthermore, when the joint mat 1 of the present invention is configured as described in (I) above, even when the pitch of the uneven parts 42 is changed, the same shaped corner uneven parts 44 can be used, making it easy to change the pitch of the uneven parts 42.

[0067] (J) The joint mat 1 according to the above embodiment is characterized in that the corrugated cardboard sheets 50 can be connected to each other such that the direction of formation of the core in each of the corrugated cardboard sheets 50 intersects with the direction of formation of the core in adjacent corrugated cardboard sheets 50.

[0068] The joint mat 1 of the present invention, when configured as described in (J) above, distributes the load on each corrugated cardboard sheet 50. As a result, the joint mat 1 of the present invention can improve the strength and durability of the joint mat 1 when multiple corrugated cardboard sheets 50 are laid together. Furthermore, because the load on the corrugated cardboard sheets 50 is distributed, deformation and damage to the corrugated cardboard sheets 50 can be suppressed. In addition, the joint mat 1 of the present invention, when configured as described in (J) above, has different core formation directions at the connection (joining) parts of the corrugated cardboard sheets 50, which increases the stability of the connection and improves the strength of the connection.

[0069] The joint mat 1 of the present invention can be modified as appropriate without departing from the spirit of the invention, and is not limited to those exemplified in the above embodiment or those relating to (A) above, but may also have configurations like the following modified examples. The joint mat 1 according to the first modified example and the second modified example will be described below. In the description of the modified examples, components similar to those of the joint mat 1 according to the above embodiment will be denoted by the same reference numerals, and detailed descriptions will be omitted. Also, please note that some effects similar to those of the joint mat 1 according to the above embodiment may be omitted.

[0070] (M) The joint mat 1 according to the above embodiment is made of a rectangular corrugated cardboard sheet 50, the corrugated cardboard sheet 50 has connecting parts on each side of its outer circumference that can be connected to other corrugated cardboard sheets 50, the connecting part 40 has a plurality of protrusions and recesses 42 that can engage with other corrugated cardboard sheets, at least one of the protrusions and recesses 42 has a return part 43, the return part 43 is characterized in that the protruding end side of the protrusion in the protrusion 42 is expanded in the width direction, the base end side of the protrusion is reduced in the width direction, the opening end side of the recess in the protrusion 42 is reduced, and the bottom side of the recess is expanded.

[0071] The joint mat 1 of the present invention, when configured as described in (13) above, can prevent the corrugated cardboard sheets 50 from falling off due to the engagement of the protrusions and recesses 42 when multiple corrugated cardboard sheets 50 are connected. Here, the return allowance of the return portion can be adjusted by adjusting the amount of expansion in the width direction of the protruding end of the convex portion and the amount of reduction of the opening end of the concave portion (the amount of expansion in the width direction of the bottom of the concave portion). This makes it possible to adjust the degree of engagement between the protrusions and recesses in the return portion 43.

[0072] ≪First form of torture≫ As shown in Figure 5, in the joint mat 1 according to the first modified example of the present invention, in addition to the joint mat 1 according to the above embodiment, an outer edge member 110 is provided on the outer circumference of the multiple joint mats 1 to be connected. In the joint mat 1 according to the first modified example, the configuration is the same as in the above embodiment except for the provision of the outer edge member 110, so the description of the similar parts will be omitted.

[0073] In the first modified example, the joint mat 1, when multiple laminated mats 30 are connected to each other, allows at least one outer edge member 110 to be connected to the outer circumference of the connected multiple laminated mats 30 via a connecting portion 40.

[0074] The outer edge member 110 can be connected so as to surround the outer periphery of a plurality of connected laminated mats 30. The outer edge member 110 is formed, for example, in a horizontally elongated rectangular shape, and can protect the outer edge of the laminated mat 30. The outer edge member 110 is formed in the same way as the laminated mat 30 and has a first core 114 and a second core 124. The outer edge member 110 has protrusions 142 (connecting portion 140) that correspond to the protrusions 42 of the laminated mat 30 so as to be able to engage with the protrusions 42 of the laminated mat 30 to be connected. In the joint mat 1 according to the first modified example, the outer edge member 110 corresponding to the corner 2 on the outer periphery of the laminated mat 30 has an extension portion 102 so as to surround at least a part of the corner 2. The outer periphery of the extension portion 102 is cut out in an arc shape, which can suppress scratching or damage to other articles when the extension portion 102 comes into contact with other articles.

[0075] Furthermore, in the joint mat 1 according to the first modified example, the formation direction (first formation direction Y) of the core (first core 14 and second core 24) of the laminated mat 30 (first corrugated cardboard sheet 10 and second corrugated cardboard sheet 20) can be connected such that the formation direction (second formation direction X) of the core (first core 114 and second core 124) of the outer edge member 110 connected to the laminated mat 30 intersects with each other (orthogonal in this embodiment). In the joint mat 1 according to the first modified example, a laminated mat 30 made by laminating the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 is exemplified, but the joint mat 1 according to the first modified example may not only use a laminated mat 30, but may also use a single layer corrugated cardboard sheet 50 (see Figure 8), or a laminated mat 30 made by laminating two or more layers of corrugated cardboard sheets. The single layer corrugated cardboard sheet 50 is said to have a first backing 52a, a core 54, and a second backing 52b, etc. Furthermore, when using a single-layer corrugated cardboard sheet 50, if an outer edge member 110 is used, it is preferable that the outer edge member 110 also be made of a single-layer corrugated cardboard sheet 50.

[0076] The above describes the configuration of the joint mat 1 according to the first modified example of the present invention, and the effects of the joint mat 1 according to the first modified example will be described below. The joint mat 1 embodying the invention according to the first modified example, as illustrated in the above-described embodiment, has the characteristic configuration shown in (K) and (L) below, thereby achieving the effects unique to the present invention.

[0077] (K) The joint mat 1 according to the first modified example described above is made of corrugated cardboard sheets 50 (including laminated mat 30), has outer edge members 110 that can be connected to the corrugated cardboard sheets 50 via connecting parts 40, and is characterized in that when a plurality of corrugated cardboard sheets 50 are connected to each other, at least one outer edge member 110 can be connected to the outer circumference of the corrugated cardboard sheets 50 via connecting parts 40.

[0078] By configuring the joint mat 1 of the present invention as described in (K) above, when multiple corrugated cardboard sheets 50 are connected, the corrugated cardboard sheets 50 located at the outer edge can be prevented from lifting up. Furthermore, by forming the outer edge of the outer edge member 110 of the joint mat 1 of the present invention in a straight line, the outer edge of the outer edge member 110 can be positioned in close contact with the wall surface of a room, etc. As a result, the joint mat 1 of the present invention is expected to have an improved fit to the room, etc.

[0079] (L) The joint mat 1 according to the first modified example described above is characterized in that the formation direction of the core of the outer edge member 110 connected to the corrugated cardboard sheet 50 (including the laminated mat 30) intersects with the formation direction of the core of the corrugated cardboard sheet 50 (including the laminated mat 30).

[0080] By configuring the joint mat 1 of the present invention as described in (L) above, the formation direction of the core of the corrugated cardboard sheet 50 (including the laminated mat 30) and the formation direction of the core of the outer edge member intersect with each other, thereby suppressing the peeling of the backing paper (first backing paper 52a, second backing paper 52b) in the corrugated cardboard sheet 50.

[0081] The above describes the configuration of the joint mat 1 according to the first modified example. Next, the configuration of the joint mat 200 according to the second modified example, in which the pitch of the multiple protrusions and recesses 42 in the connecting portion 40 is made the same, will be described.

[0082] ≪Second Variation≫ The joint mat 200 according to the second modified example of the present invention has the same pitch for the uneven portions 42 as in the joint mat 1 according to the above embodiment, and the other configurations are the same as those of the joint mat 1 according to the above embodiment and the first modified example. Therefore, the following description omits the explanation of the configurations of the same parts. Also, please note that the same reference numerals are used for parts and the like as in the above embodiment.

[0083] As shown in Figure 6, the joint mat 200 according to the second modified example of the present invention has multiple protrusions 42 on each side of the outer circumference of the laminated mat 30, with the same pitch in the width direction. As shown in Figure 7, multiple joint mats 200 can be connected in the same way as in the embodiment described above, by engaging (connecting) each protrusion 42 on one laminated mat 30 with the corresponding protrusion 42 on another adjacent laminated mat 30. This allows the laminated mats 30 to be combined to expand the laying area.

[0084] The above describes the configuration of the joint mat 200 according to the second modified example, and the effects of the joint mat 200 according to the second modified example will be explained below. The joint mat 200 embodying the present invention, as illustrated in the second modified example described above, has the characteristic configuration shown in (E) below, which enables it to produce effects unique to the present invention.

[0085] (E) In the joint mat 1 according to the second modified example described above, the laminated mat 30 is provided with connecting portions 40 on each side of its outer circumference that can be connected to other laminated mats 30, and the connecting portion 40 has a plurality of protrusions and recesses 42 that can engage with each other with other laminated mats 30, and the plurality of protrusions and recesses 42 are formed with the same pitch in the width direction.

[0086] The joint mat 1 of the present invention can be configured as described in (E) above, allowing for easy formation of a laminated mat 30 (joint mat 1). Furthermore, the joint mat 1 of the present invention, configured as described in (E) above, allows for even distribution of the load on the uneven portion 42 in the connected state. As a result, the joint mat 1 of the present invention has improved strength at the connection portion 40.

[0087] The above describes the structure and effects of the joint mat 200 according to the second modified example. However, the above-described embodiments and modified joint mats 1 and 200 are merely examples of the joint mat 1 of the present invention and can be modified as appropriate without departing from the spirit of the present invention.

[0088] <<Other variations>> In this embodiment, the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 are formed with different thicknesses, but the joint mat 1 of the present invention is not limited to this. For example, in the joint mat 1 of the present invention, the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 may both have the same thickness. Also, in this embodiment, the thickness d1 of the first corrugated cardboard sheet 10 is formed to be smaller than the thickness d2 of the second corrugated cardboard sheet 20, but the thickness d1 of the first corrugated cardboard sheet 10 may be formed to be larger than the thickness d2 of the second corrugated cardboard sheet 20. Furthermore, the thickness d1 of the first corrugated cardboard sheet 10 and the thickness d2 of the second corrugated cardboard sheet 20 can be formed to various thicknesses, not just those of the embodiment described above, and the total thickness of the laminated mat 30 can also be formed to various thicknesses.

[0089] Furthermore, in this embodiment, the laminated mat 30 is formed by laminating two layers of corrugated cardboard sheets, a first corrugated cardboard sheet 10 and a second corrugated cardboard sheet 20, but the laminated mat 30 may be formed by laminating three or more layers of corrugated cardboard sheets. Also, the joint mat 1 of the present invention may be formed by a single layer of corrugated cardboard sheet 50 instead of the laminated mat 30. Furthermore, in this embodiment, the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 are indirectly bonded together via a third backing sheet 32, but for example, instead of a shared third backing sheet 32, the first corrugated cardboard sheet 10 and the second corrugated cardboard sheet 20 may be directly or indirectly bonded together via backing sheets (liners) that each of them has individually provided.

[0090] In this embodiment, the first core pitch P1 of the first core 14 and the second core pitch P2 of the second core 24 in the laminated mat 30 are formed at different pitches. However, the first core pitch P1 and the second core pitch P2 can be appropriately changed depending on the thickness of the corrugated cardboard sheet used. For example, the first core pitch P1 and the second core pitch P2 may be formed at the same pitch. Also, in this embodiment, the first core 14 and the second core 24 are arranged side by side in the first formation direction Y. However, the formation directions of the first core 14 and the second core 24 may be arranged in directions that intersect each other (for example, orthogonal directions). Furthermore, the formation directions of the first core 14 and the second core 24 can be formed in various directions, from parallel to each other along the first formation direction Y to slightly intersecting directions.

[0091] In this embodiment, when connecting multiple laminated mats 30, the formation directions of the first core 14 and second core 24 in one laminated mat 30 are shown to be different (orthogonal) from those of the other laminated mats 30. However, the formation directions of the first core 14 and second core 24 in one laminated mat 30 during connection are not limited to those that are orthogonal to each other, but can also be intersected at various angles. Furthermore, the formation directions of the first core 14 and second core 24 in one laminated mat 30 can be arranged so that they are aligned in the same direction as the formation directions of the first core 14 and second core 24 in the other laminated mats 30 that are connected.

[0092] In this embodiment, the small-pitch unevenness portion 42S is shown as being positioned inward along the edge direction of the corrugated cardboard sheet 50, beyond the large-pitch unevenness portion 42L. However, the embodiment is not limited to this, and the small-pitch unevenness portion 42S and the large-pitch unevenness portion 42L can be positioned at any desired location.

[0093] Furthermore, in the second modified example, the pitch in the width direction of the multiple uneven portions 42 is formed with the same pitch, but each pitch can be formed with various pitches that are the same in the width direction.

[0094] In this embodiment, when four adjacent corrugated cardboard sheets 50 are connected in a rectangular shape via corner protrusions 44, an example is shown in which each side of the corner protrusions 44 intersects in an X shape at the intersection of the corners 2. However, the joint mat 1 of the present invention is not limited to this, and various connection configurations can be adopted. In such cases, it is desirable that the intersection points of the corners 2 of the multiple joint mats 1 coincide when the corner protrusions 44 are engaged.

[0095] In this embodiment, an example is shown in which multiple corrugated cardboard sheets 50 (including the laminated mat 30) are connected to each other such that the direction of core formation in each sheet is perpendicular to the direction of core formation in adjacent corrugated cardboard sheets 50. However, the joint mat 1 of the present invention is not limited to this. For example, the direction of core formation in one corrugated cardboard sheet 50 and the direction of core formation in an adjacent corrugated cardboard sheet 50 may intersect at an angle other than 90 degrees (perpendicular).

[0096] Furthermore, the shape of the protrusions and recesses 42 in the connecting portion 40 is not limited to those described above, and various shapes and sizes can be used. Also, the return portion 43 in the protrusions and recesses 42 may be provided as needed, and a configuration without the return portion 43 is also possible. Furthermore, it is preferable that the return portion 43 is formed in a direction that is difficult to disengage from the protrusions and recesses 42, for example, in a direction intersecting the engagement direction. Also, various shapes of return portions 43 can be used.

[0097] In the first modified example of the joint mat 1, an example was given in which an outer edge member 110 is provided on the outer periphery of the connected joint mats 1. However, the outer edge member 110 can be provided only if necessary, and a configuration without an outer edge member 110 is also possible.

[0098] In the first modified example of the joint mat 1, the formation direction of the core of the outer edge member 110 connected to the corrugated cardboard sheet 50 (including the laminated mat 30) is exemplified as being perpendicular to the formation direction of the core of the corrugated cardboard sheet 50 (including the laminated mat 30), but the joint mat 1 of the present invention is not limited to this. For example, the formation direction of the core of the outer edge member 110 connected to the corrugated cardboard sheet 50 may not be perpendicular to the formation direction of the core 54 of the corrugated cardboard sheet 50, but may intersect at other angles.

[0099] The present invention is not limited to the configuration described in the embodiments above, and can be modified as appropriate without departing from the scope of the technical idea of ​​the present invention. The components of each embodiment and modification described above can be arbitrarily selected and combined. Furthermore, any component of each embodiment and modification can be arbitrarily combined with any component described in the means for solving the problem, the form for carrying out the invention, etc., or a component that embodies any component described in the means for solving the problem, the form for carrying out the invention, etc. The present application or a divisional application based thereon also intends to obtain rights for these as well. [Industrial applicability]

[0100] The joint mat of the present invention can be suitably used by laying it on various surfaces such as the floors of various buildings including evacuation facilities and houses, the floors of food trucks and kitchens, and the ground at campsites, etc. [Explanation of symbols]

[0101] 1: Joint mat 2: Corner 10: First Cardboard Sheet 12: First mounting board (first liner) 14:First core 20: Second cardboard sheet 22: Second mounting board (second liner) 24:Second core 30: Laminated mat 40: Connection part 42: Uneven part 42L: Large pitch uneven area 42S: Small pitch uneven surface 43: Return section 44: Corner unevenness 50: Cardboard sheet 110: Outer edge member P1: First core pitch P2: Second core pitch X: Second forming direction Y: First forming direction

Claims

1. The first cardboard sheet is rectangular in shape, A second corrugated sheet formed in substantially the same shape as the first corrugated sheet, Equipped with, The first corrugated cardboard sheet and the second corrugated cardboard sheet are directly or indirectly laminated to form a laminated mat. The aforementioned laminated mat is a joint mat characterized in that each side of its outer perimeter is provided with a connecting portion that can be connected to other laminated mats.

2. The joint mat according to claim 1, characterized in that the first corrugated cardboard sheet and the second corrugated cardboard sheet are formed with different thicknesses.

3. The aforementioned laminated mat is The first core pitch of the first core in the first corrugated cardboard sheet and the second core pitch of the second core in the second corrugated cardboard sheet are formed with different pitches from each other. The joint mat according to claim 1 or 2, characterized in that the first core and the second core are arranged side by side in the same forming direction.

4. The aforementioned laminated mat is The first core in the first corrugated cardboard sheet and the second core in the second corrugated cardboard sheet are arranged side by side in the same forming direction. The joint mat according to claim 1 or 2, characterized in that the first core and the second core in a plurality of laminated mats can be connected to each other such that they are arranged in a direction intersecting the formation direction.

5. The aforementioned laminated mat has connecting parts on each side of its outer circumference that can be connected to other laminated mats. The connecting portion has a plurality of protrusions and indentations that can engage with each other with the other laminated mats, The joint mat according to claim 1 or 2, characterized in that the plurality of uneven portions are formed with the same pitch in the width direction.

6. The first cardboard sheet is rectangular in shape, A second corrugated sheet formed in substantially the same shape as the first corrugated sheet, Equipped with, The first corrugated cardboard sheet and the second corrugated cardboard sheet are directly or indirectly laminated to form a laminated mat. The aforementioned laminated mat has connecting parts on each side of its outer circumference that can be connected to other laminated mats. The first corrugated cardboard sheet and the second corrugated cardboard sheet are formed with different thicknesses. The aforementioned laminated mat is The first core in the first corrugated cardboard sheet and the second core in the second corrugated cardboard sheet are arranged side by side in the same forming direction. A joint mat characterized in that the first core and the second core of a plurality of laminated mats can be connected to each other such that they are arranged in a direction intersecting the formation direction.

7. It is made of rectangular cardboard sheets, The aforementioned corrugated cardboard sheet has connecting parts on each side of its outer perimeter that can be connected to other corrugated cardboard sheets. The connecting portion has a plurality of protrusions and indentations that can engage with each other with the other cardboard sheets. The joint mat is characterized in that the plurality of uneven surfaces have at least one large-pitch uneven surface with a large pitch in the width direction, and at least one small-pitch uneven surface with a pitch in the width direction smaller than that of the large-pitch uneven surface.

8. The joint mat according to claim 7, characterized in that the small-pitch uneven portion is arranged inward along the edge direction of the corrugated cardboard sheet compared to the large-pitch uneven portion.

9. Corner protrusions are formed at each of the four corners of the corrugated cardboard sheet, constituting at least a part of the connecting portion. When connecting four adjacent cardboard sheets in a rectangular shape via the corner protrusions, The joint mat according to claim 7 or 8, characterized in that each of the aforementioned corners is butted together and the corresponding corner protrusions are connected to each other, so that each side of the respective corner protrusions at the intersection of the corners intersects in an X shape.

10. The joint mat according to claim 7 or 8, characterized in that the corrugated cardboard sheets can be connected to each other such that the direction of formation of the core in each of the multiple corrugated cardboard sheets intersects with the direction of formation of the core in each adjacent corrugated cardboard sheet.

11. It is made of the aforementioned corrugated cardboard sheet and has an outer edge member that can be connected to the corrugated cardboard sheet via the connecting portion, In a state in which multiple cardboard sheets are connected to each other, The joint mat according to claim 7 or 8, characterized in that at least one of the outer edge members can be connected to the outer periphery of the cardboard sheet via the connecting portion.

12. The joint mat according to claim 11, characterized in that the direction of formation of the core of the outer edge member connected to the corrugated cardboard sheet intersects with the direction of formation of the core of the corrugated cardboard sheet.

13. It is made of rectangular cardboard sheets, The aforementioned corrugated cardboard sheet has connecting parts on each side of its outer perimeter that can be connected to other corrugated cardboard sheets. The connecting portion has a plurality of protrusions and indentations that can engage with each other with the other cardboard sheets. At least one of the aforementioned uneven portions has a return portion, The joint mat according to claim 7 or 8, characterized in that the return portion has the protruding end side of the convex portion in the uneven portion expanded in the width direction, the base end side of the convex portion reduced in the width direction, the opening end side of the concave portion in the uneven portion reduced, and the bottom side of the concave portion expanded.

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