JP2020083295A - Inflatable structure, production method of inflatable and double film body structure - Google Patents

Abstract

To provide an inflatable comprising a V-shaped cross sectional shape, the inflatable being formed of, as substrates, two airtightness film bodies which face each other and are coupled so as to regulate an interval by a plurality of strings, capable of being easily and inexpensively produced, suppressing peeling of adhesion, and when being used as SUP, allowing a rider to mount his/her feet thereon, and suppressing adhesion peeling due to on-water slide and being dragged on a bottom face, to provide a production method thereof and a double film body suitable for the production.SOLUTION: In a double film body which is a substrate of an inflatable, one of facing airtightness film bodies is cut and cut end parts thereof are laminated vertically and are adhered.SELECTED DRAWING: Figure 2

Description

The present invention relates to an inflatable structure used for a stand-up paddle board (hereinafter referred to as SUP) and the like, and a manufacturing method thereof.

Conventionally, as a substrate that constitutes a board-shaped inflatable in which a high-pressure pressurized gas such as SUP is enclosed, two airtight film bodies are made to face each other, and these facing surfaces have a large number of substantially constant lengths. A double-layered membrane is used, which is interconnected by a string (String), and the distance between the membranes is regulated by the string. Specifically, high-pressure gas is sealed by air-tightening the peripheral portions of the double film body, such as connecting the peripheral portions of the air-tight film bodies facing each other with another band-shaped air-tight film body. Inflatable possible.

When such an inflatable is filled with a pressurized gas, the two airtight film bodies forming the double film body are separated from each other by the internal pressure, while the two airtight film bodies are pulled to each other through the string to have a substantially constant thickness. To define a flat plate. In particular, in hydroplane inflatables such as SUP, high-pressure gas of about 12 to 15 PSI is filled in order to increase the resistance to deformation, but the action of the string does not make a rounded shape, but a plate shape suitable for a person to ride on. Maintained.

By the way, when not only a person rides but also the gliding performance (especially the gliding speed) is taken into consideration, the bottom of the SUP, which is the gliding surface, is not simply a flat shape, but a cross section orthogonal to the front-back direction (sliding direction). It is preferable that it projects so as to have a V-shape. In this regard, if the string length can be freely set by changing the string length for each part on the double film body, it is possible to provide the V-shaped protruding portion, but it is not easy in terms of technology and profitability. Therefore, as a means for forming an inflatable structure with a V-shape added by using a double film body in which airtight film bodies are connected by strings and kept at a constant interval, the following (1) to (3) are used. Various technologies have been proposed.

(1) As shown in FIG. 4( a ), by applying a force to the inflatable 100 defined in a flat shape by the double film body whose spacing is regulated by the string S, the inflatable 100 is bent into a V shape, As shown in FIG. 6B, the folded-back portion 100a on the valley side is brought into close contact with each other and fixed by adhesion to form a V-shape. Further, the reinforcing cloth 101 is attached so as to straddle the upper surfaces on both sides of the adhered and fixed contact portion (see, for example, Patent Document 1).

(2) In the inflatable 200 defined in a flat shape by the double membrane body whose spacing is regulated by a large number of strings S, as shown in FIG. 5A, along the center line extending in the sliding direction, the airtight membrane is formed. The upper sheet 200a and the lower sheet 200b, which are formed of a body, are sewn together to form a linear contact portion 200c. Then, as shown in FIG. 6B, another strip-shaped sheet 201, 202 made of an airtight film body is attached, and the close contact portion 200c is covered from the upper surface and the lower surface side to prevent gas leakage from the needle hole. To do. At this time, by pulling the top sheet 200a toward the center, when the gas is filled, the top sheets pull each other through the strip sheet 201 as shown in FIG. Is bent into a V shape (see, for example, Patent Document 2).

(3) As shown in FIG. 6, two inflatables 301 and 302, which are defined in a flat shape by a double film body whose spacing is regulated by a string S, are arranged so that their one end surfaces 301a and 302a are adjacent to each other. Then, the upper surface side 301b and 302b and the lower surface side 301c and 302c are hermetically connected by two airtight film bodies 303 and 304 (304 is longer than 303) having different lengths, respectively, to form an inflatable body. Form 300. In addition, the end faces 301a and 302a to be arranged adjacent to each other are formed in advance with a mesh. When the whole inflatable 300 is ventilated by being filled with a pressurized gas, a V-shaped angle is formed due to the difference in length of the airtight film bodies 303 and 304 connecting the upper surface side and the lower surface side (for example, Patent Document 1). See 3.).

JP 2001-82004 A JP, 2011-225008, A Japanese Patent Publication No. 8-1106

According to the inflatable structures of the above-mentioned related arts (1) to (3), it is possible to form an inflatable body having a V-shaped cross section by using as a base material a double film body that is regulated by a large number of strings so as to keep a constant interval. You can, but there are the following problems.

In the related art (1), the inflatable 100 is bent and the folded-back portion 100a on the valley side thereof is adhesively fixed. However, the airtight film body that encloses the high-pressure gas is lined with an airtight resin sheet or a cloth Since it is thick and has high rigidity such as coating with a resin, it is difficult to completely adhere the folded-back portion, and defective adhesion is likely to occur. Moreover, the internal pressure of the high-pressure gas acts to spread the folded-back portion 100a and peel off the adhesive portion. The reinforcing cloth 101 also has V-shaped angles on the attaching surfaces 101a and 101b, and is easily pulled by pulling in a direction in which they are peeled from each other. In particular, when a person rides on the SUP or the like and slides on the water, a load is repeatedly applied to the adhesive portion, and the adhesive portion is more easily peeled off. In addition, the V-shaped recess 101c on the upper surface has a problem that the occupant cannot place his/her feet stably.

In the prior art (2), the band-shaped sheets 201 and 202 have to be adhered on both sides across the adhesion part 200c, and the adhesion surface is elongated and there are four places, so that the burden of managing the attachment margin and the adhesion is large, There is concern about gas leakage due to poor work. In particular, since the airtight film body that encloses the high-pressure gas has high rigidity and cannot completely flatten the attracted top sheet 200a, it is considerably difficult to bond the strip-shaped sheet thereon. In addition, since the strip-shaped sheets 201 and 202 have no strings, the adhesive portion receives all the internal pressure of the high-pressure gas and is easily peeled off. Especially when it is used as a SUP or the like, it becomes easier to peel due to the repeated action of the load. Since the belt-like sheets 201 and 202 swell like ridges as shown in FIG. 5(c), when used for SUP or the like, the rider cannot stably place his/her feet on the upper surface side, and the lower end has the protruding end above the water. There is a problem that the adhesion is easily peeled off by sliding or being dragged on land.

In the above-mentioned conventional technique (3), the inflatables 301 and 302 are connected by the two airtight film bodies 303 and 304, but the connecting portion is elongated and there are four places, and the manufacturing load is heavy. Moreover, since the airtight film bodies 303 and 304 to be connected do not have strings like the strip-shaped sheet of the above-mentioned conventional technique (2), the adhesion may be easily peeled off by the internal pressure of the high-pressure gas. Further, since the airtight film bodies 303 and 304 swell in a ridge shape with high-pressure air, when used for SUP or the like, the rider cannot stably place his/her feet on the upper surface side as in the above-mentioned conventional technique (2). On the lower surface side, there is a problem that the adhesion is likely to be peeled off when the tip is slid over the water or dragged on land. In addition, the cost burden for forming the end portions 301a and 302a with a mesh is considerably large.

In view of the above situation, the present invention can be easily and inexpensively manufactured by using two airtight film bodies that are opposed to each other and are connected so as to regulate the interval with a large number of strings, and can be bonded. Is less likely to cause peeling, and when used as a SUP or the like, a rider can easily put his/her foot on it, and there is no fear of peeling of the adhesive due to sliding on the water or dragging the bottom surface. The purpose is to provide.

The invention of claim 1 is an inflatable structure in which pressurized air is enclosed between double membranes, wherein the double membranes are connected so as to face each other and to regulate the spacing by a large number of strings. Provided is an inflatable structure characterized in that one of two airtight film bodies is separated into a plurality of airtight film body pieces, and cut ends thereof are overlapped and adhered.

According to a second aspect of the present invention, one of the two airtight film bodies that are opposed to each other and are connected so as to regulate the spacing by a large number of strings is separated into a plurality of airtight film body pieces, and the cut ends are cut off from each other. Provided is an inflatable structure, characterized in that a peripheral portion of a double-layered film formed by stacking and adhering is airtightly processed.

The invention according to claim 3 provides the inflatable structure according to claim 1 or 2, characterized in that the string connected to the cut ends to be overlapped and bonded is cut or removed.

An invention according to claim 4 provides the inflatable structure according to any one of claims 1 to 3, wherein an airtight film body covering the seam of the overlapping adhesive portion is attached.

According to a fifth aspect of the present invention, there is provided a method of manufacturing an inflatable body using two airtight film bodies which are opposed to each other and are connected to each other by a number of strings so as to regulate the distance, wherein one of the airtight film bodies is formed in plural. The airtight film body is cut off and the cut ends are overlapped and bonded together, and the bonded airtight film body and the peripheral part of the other airtight film body are airtightly connected and used. A method of manufacturing an inflatable structure is provided.

The invention of claim 6 provides a method of manufacturing an inflatable device according to claim 5, wherein the string connected to the cut end is cut or removed.

According to the invention of claim 7, in a double membrane structure for forming an inflatable structure having a V-shaped cross section capable of enclosing pressurized air, the distance is regulated by a plurality of strings facing each other. Provided is a double-layered membrane structure characterized in that one of the two hermetically-sealed membrane bodies thus connected is separated into a plurality of hermetically-sealed membrane body pieces, and the cut ends are superposed and adhered to each other. ..

According to the invention of claim 1, 2 or 5, the following excellent effects are exhibited. One of the two airtight film bodies that are opposed to each other and are connected by a number of strings so as to maintain a constant interval is cut over the entire length thereof to be cut into a plurality of airtight film body pieces and the cut ends thereof. When the compressed air is enclosed between the parts by pulling the parts together and adhering them on top of each other, the width dimension of the overlap adhesion part in one airtight film body and the airtight film body in the other The inflatable is bent according to the difference in the width dimension of the portion facing the cut end, and a V-shaped cross section can be formed over the entire length of the inflatable. The V-shaped angle can be easily set by appropriately adjusting the width dimension of the overlapping adhesive portion.

That is, it suffices to provide a cut portion on one side of the double-layered film body and overlap the cut-off end portions to bond them together. The inflatable having a V-shaped cross section can be easily and inexpensively manufactured without performing a troublesome work such as attaching another film on the flexible film. Further, even if a pressure of pressurized gas is applied to the superposed adhesive portion, it does not act in the direction of peeling the adhesive surface, and peeling of the adhesive is less likely to occur as compared with the above-mentioned prior art.

When the inflatable device according to the above invention is used for SUP or the like, the lapped adhesive part has a double structure to increase rigidity and is hard to be deformed, and a flat part continuous to the inclined parts on both sides defined by the string is formed. By doing so, the rider can rest their feet relatively stably. Since there is no adhesive portion serving as a joint in the opposing portion protruding in the V-shape, even if a load is caused by sliding on water or dragging on land, gas leakage due to adhesive peeling is unlikely to occur.

By combining the inflatable structure, not only a plate-like object such as SUP, but also a boat or the like in which, for example, the bottom portion and the side wall portions or the intersections of the side wall portions are formed in the V shape can be manufactured. In addition, the ridge of the roof of the inflatable structure, the corners connecting the roof and the side wall or the corners connecting the side walls, the intersection of the bottom and the side wall of the inflatable container are formed in the V shape, etc. Other articles and structures may be manufactured.

According to the invention of claim 3 or 6, in addition to the effect of the invention of claim 1, 2 or 5, the following excellent effects are exhibited. By cutting or removing the string connected to the cutting end, the string does not act on the facing part facing the cutting end, and the facing part has a ridge shape due to the internal pressure of the high-pressure gas enclosed. Project to. This further improves the water gliding performance when the inflatable structure is used for the SUP, the bottom of the boat, or the like. In addition, since the lapped adhesive portion has a double structure and increased rigidity, it does not easily project even when a high pressure is applied, and it does not hinder the rider from placing his/her feet.

According to the invention of claim 4, in addition to the effects of the inventions of claims 1 to 3, the following excellent effects are exhibited. At the overlapped adhesive part, there are left marks of the strings or the strings were fixed, and the inner surface of the inflatable is lined with a cloth to strengthen the film body, so it is a little from the seam. Although it is feared that gas leakage may occur, it can be completely sealed by covering the seam with another airtight membrane. Since the airtight film body is thick due to the string or the traces of adhesion of the string or the lined cloth, the step of the seam of the superposition adhesion part is large, and the foot of the rider is easily caught when used as SUP, etc., If it is originally covered with a thin airtight film body without a string or lining cloth, it is less likely to get caught and the appearance can be improved.

By using the double membrane structure according to the invention of claim 7, it is possible to easily and inexpensively form an inflatable having a V-shaped cross section capable of enclosing high-pressure pressurized gas.

The top view explaining the embodiment of the present invention. 1. XX sectional drawing of FIG. The top view explaining another embodiment of the present invention. Sectional drawing explaining prior art (1). Sectional drawing explaining prior art (2). Sectional drawing explaining prior art (3).

1 and 2 are diagrams for explaining an inflatable structure and a manufacturing method thereof according to the present invention, and more specifically, show a case of manufacturing an inflatable SUP using the inflatable structure according to the present invention. 2A to 2G correspond to XX cross sections of FIGS. 1A to 1G, respectively. 1 and 2, metal fittings for attaching accessory parts such as air supply/exhaust valves (air filling ports), fins, carrying handles, carrying webbings, leash cords, etc., and other accessory parts that are usually equipped in the SUP. Are omitted, and the description thereof will be omitted below.

In the inflatable structure and the manufacturing method thereof according to the present invention, the two airtight membranes facing each other are connected to each other by a large number of strings and the strings have a substantially constant length. The film body is used as a base material. This double membrane body constitutes an inflatable body in which the peripheral portions of the airtight membrane bodies which face each other are airtightly connected by a band-shaped airtight membrane body and the inside is sealed, and pressurized air is enclosed. Therefore, it is generally used to define a plate-shaped body having a substantially constant thickness according to the string length.

The airtight film forming the double film has high strength by covering the surface of the cloth with an airtight material such as resin or rubber or by bonding the cloth to an airtight sheet such as resin or rubber. It is configured so that it hardly expands or contracts. The backing cloth is used to reinforce the tensile load of the string. The string is also made of a material such as nylon or polyester so as to have high strength and hardly expands and contracts, and both ends thereof are adhesively fixed to the airtight membranes facing each other. As a result, the flat shape is maintained even if high-pressure pressurized air is enclosed, and an inflatable with high deformation resistance is constructed. Note that, in FIG. 2, the strings S are drawn in various lengths for convenience of drawing, but in practice, they are set to a substantially constant length as shown in FIG.

Now, in the case of manufacturing an inflatable SUP having a V-shaped cross section when pressurized air is enclosed using the inflatable structure of the present invention, as shown in FIG. 1(a) and FIG. 2(a). Then, a double film body 10 that is cut out to be long and thin (for example, a total length of about 3.2 m and a width of about 0.8 m) is prepared according to the plan view shape of the SUP to be manufactured. The double film body 10 is composed of two air-tight film bodies 11 and 12 which are bilaterally symmetric and have the same shape and size, and a large number of strings S which connect the opposing surfaces thereof and define the film body spacing. There is. The airtight film bodies 11 and 12 have an airtight resin sheet lined with a reinforcing cloth.

First, as shown in FIGS. 1(b) and 2(b), one of the airtightnesses on the upper side along the centerline CL extending in the longitudinal direction of the double membrane body 10, that is, the front-back (sliding) direction of the SUP. Only the flexible film body 11 is linearly cut with a blade or the like over its entire length. As a result, the airtight film body 11 remains connected to the other airtight film body 12 on the lower side by a large number of strings S, and the left and right airtight film bodies are separated by the straight cut portion C1. It is separated into pieces 11R and 11L.

Next, as shown in FIGS. 1C and 2C, in each of the airtight membrane body pieces 11R and 11L, cut end portions 11a and 11b having a predetermined width W extending along the cut portion C1 (see FIG. 1C). The string S that is connected to the strip-shaped portion indicated by hatching in (c) is cut with a blade or the like. As a result, the strip-shaped cut ends 11a and 11b (total width dimension 2W) at the center of the airtight film body 11 and the strip-shaped facing portion 1b (at the center of the airtight film body 12 facing each other) ( The connection by the string S having a width dimension of 2 W is eliminated.

The string S may be simply cut, but if the cut end of the string remains at the cut end, the bonding surface does not adhere to the next bonding step, and it becomes difficult to secure airtightness. Therefore, it is preferable that at least one of the cut ends 11b where the surface to which the strings are connected is the adhesive surface is removed by cutting or peeling off the string S at the root. The portions other than the cut end portion 1a (the cut end portion 1b, the facing portion 1b) may be removed because the remaining cut edges may be caught in the bonding surface and interfere with the bonding work.

In the bonding step, as shown in FIG. 1D and FIG. 2D, the left and right airtight film body pieces 11R and 11L are drawn to each other, and the cut ends 11a and 11b having the width dimension W are vertically stacked. It is integrated again by adhering in a hermetically sealed manner. As a result, in the central portion in the lateral width direction, the airtight film body 11' in which the strip-shaped overlapping adhesive portion 1a having the width dimension W (hatched portion in FIG. 2D) extends over the entire length is formed. As a result, the airtight film body 11' is packed from the original airtight film body 11 such that the width dimension of the central portion in the lateral width direction is from 2W (cut end portions 11a, 11b) to W (lapped adhesive portion 1a). On the other hand, in the airtight film body 12, the width dimension of the central portion (opposing portion 1b) in the lateral width direction does not change at 2 W, and except the central portion, the upper airtight film body 11' and the lower airtight film body are formed. A double film structure in which 12 are connected by the string S is formed.

Then, as shown in FIGS. 1(e) and 2(e), the width is larger than that of the overlapping adhesive portion 1a so as to cover the overlapping adhesive portion 1a over the entire length of the airtight film body 11'. A wide band-shaped airtight film body 2 is attached. Since the airtight film body 2 does not have a string, a backing cloth material such as the airtight film bodies 11 and 12 is not used, and although the thickness is small by that amount, it is made of PVC or the like and has high strength and is difficult to stretch. It is an airtight resin sheet. The first purpose of adhering the airtight film body 2 is to seal the gas leaking from the superposition adhesive section 1a through the linear joint t appearing on the outer side thereof. The fibers of the backing cloth material appear on the inner surface (back surface) of the airtight film bodies 11 and 12, and even if they are completely adhered and airtightly adhered, gas slightly leaks out from the fiber portions. This is because there are times when they come. In addition, by covering the seam t with the airtight film body 2, it is possible to prevent the seam t from being caught by the step and curling of the adhesive part starting from the seam t, and to suppress the protrusion due to the swelling of the superposition adhesive part 1a due to internal pressure. Be done.

Finally, as shown in FIG. 1(f) and FIG. 2(f), the peripheral portions of both the upper airtight film body 11' and the lower airtight film body 12 are interconnected. The strip-shaped airtight film body 3 is airtightly adhered so as to be. The airtight film body 3 is a high-strength, non-stretchable airtight resin sheet made of PVC or the like similar to the airtight film body 2, has no strings and lining cloth material, and does not leak gas from an adhesive surface or the like. .. As a result, the peripheral portion of the double membrane body 10 is airtightly processed, and the inside is sealed to complete the SUP inflatable 1 capable of enclosing pressurized air. The band-shaped airtight membrane body 3 has a vertical width dimension defined by the string S as a bonding margin dimension for the airtight membrane bodies 11 ′ and 12 so as not to hinder the expansion of the SUP inflatable 1 when the pressurized air is enclosed. It is set longer than the dimension including the thickness dimension.

When pressurized air is introduced into the SUP inflatable 1 from a supply/exhaust valve (not shown), the internal pressure causes the double membrane 10 to expand as shown in FIGS. The two airtight film bodies 11 ′ and 12 constituting each other are separated from each other, but in the portions other than the overlapping adhesion portion 1 a and the facing portion 1 b located in the central portions thereof, the airtightness of the same shape and size is the same in the vertical direction. The film body portions pull each other through a large number of strings S to define a flat plate-like body having a substantially constant thickness.

On the other hand, in the central portion, the overlapping adhesive portion 1a (width dimension W) and the facing portion 1b (width dimension 2W) have different width dimension lengths, so that as shown in FIG. A flat plate-shaped body that is bent toward the short overlapping adhesive portion 1a side (upper side) and is continuous from the central portion to both the left and right sides thereof has a substantially constant thickness, and the SUP inflatable 1 as a whole has a V-shaped cross section. Will be formed. By using the lower airtight film body 12 protruding in a V-shape as the bottom surface of the SUP, superior water gliding performance can be obtained as compared with a mere flat inflatable.

In the present embodiment, since the string S is removed from the superposition adhesive portion 1a and the facing portion 1b, and there is no action of restricting the film body interval between them, the string S is sealed when high-pressure pressurized gas is enclosed. As compared with the other portion whose interval is defined by, it is easier to swell in the thickness direction.

However, since the upper overlapping adhesive portion 1a has a double structure in which the cut end portions 11a and 11b are vertically overlapped and adhered, the rigidity is increased and the width dimension is shortened (2W→W). It is hard to be deformed and is covered with the airtight film body 2, so that the bulge is suppressed to a very small extent. As a result, it is maintained in a substantially flat shape and continues relatively smoothly to the inclined constant thickness portions on both sides, so that the person riding the SUP can place his/her feet relatively stably. Further, since the airtight film body 2 is covered, catching due to the step of the seam t is also prevented, and at that point, the rider can easily put his/her feet. Since the internal pressure does not directly act on the lapped adhesive portion 1a in the direction of peeling the adhesive surface, peeling of the adhesive hardly occurs.

On the other hand, the lower facing portion 1b is formed of only one sheet of the airtight film body 12 and has a long lateral width, which easily swells by the action of the pressurized gas, and thus is shown in FIG. 2(g). In this way, a protruding portion that extends in a ridge shape in the sliding direction of the SUP is formed. This protrusion can further improve the water gliding performance of the SUP like a keel on the bottom of a boat. Although the facing portion 1b forms a projecting portion, since it is a single piece and has no seam, there is no fear that the bonded portion will be curled up due to water gliding or dragging on land. In order to prevent damage to the film body itself, a protective film body may be attached to cover the entire airtight film body 12 or only a part such as the facing portion 1a.

As described above, according to the present invention, one side of the film body 11 of the double-layered film body 10 is linearly cut, and the cut end portions 11a and 11b are simply overlapped and bonded to each other. The character-shaped SUP inflatable 1 can be manufactured easily and inexpensively. Since the angle of the V-shape is determined based on the difference in width between the overlapping adhesive portion 1a and the facing portion 1b, the bending angle can be adjusted by adjusting the width dimension W of the cut end portions 11a and 11b to be adhesively laminated. Can be set appropriately. By partially cutting the airtight film body from the cut end portions 11a and 11b, the width dimension of the superposition adhesive portion 1a can be further reduced, so that the airtight film body 12 on the lower side is opposed. It is also possible to adjust the bending angle appropriately by adjusting the difference between the width and the length of the portion.

(Other embodiments)
In the above-described embodiment, the upper airtight film body 11 is separated into two sheets, but as shown in FIG. 3A, the airtight film body 11 is not separated, and only a part of the entire length direction is linear. 3C, the string of the cut end portions 11c and 11d on both sides of the cut portion C2 is removed to form the cut portion C2, as shown in FIG. 3C. Alternatively, the cut end portions 11c and 11d may be drawn together, and the cut end portions 11c and 11d may be vertically overlapped and bonded so as to form a fan shape in a plan view. As a result, an inflatable body having a V-shaped cross section formed in the front portion of the double film body 10 that is superposed and bonded and a flat cross section formed in the other rear portion is manufactured. You can It should be noted that cuts are provided on both sides of the airtight film body 11 with the center part in the front-rear direction sandwiched therebetween, and cut ends of the cuts are overlapped and adhered to each other to form a V-shaped cross-section on both front and rear sides. It is also possible to manufacture an inflatable in which a flat cross section is formed in the central portion.

In the above-described embodiment, the cut portion C1 is provided only at one place along the center line CL of the airtight film body 11, but it is not necessarily required to be provided along the center line CL, and the cut portions are provided at a plurality of places. As a result, a cross section formed by combining a plurality of V-shaped cross sections may be formed, for example, a U-shaped cross section or a W-shaped cross section. Further, in the above embodiment, the cut ends 1a and 1b are overlapped and adhered so that the cut lines thereof are parallel, but the cut lines are obliquely overlapped and adhered so that the cut lines can be mutually angled, You may form the superposition|adhesion adhesive part which a width|variety changes along a full length direction. Thereby, the bending angle of the inflatable can be changed along the entire length direction. Further, in the above embodiment, all the strings S of the cut end portions 11a and 11b to be the overlapping adhesive portion 1a are cut or removed, but the cut end portion having the surface to which the strings S are connected as the adhesive surface is used. It is also possible to cut or remove only 11b. In the above-mentioned embodiment, the airtight film bodies 2 and 3 are made of resin sheets without a backing cloth, but those using cloth may be adopted. For example, a resin sheet may be attached to the surfaces to be bonded. The resin may be covered to ensure the airtightness of the adhesive portion.

Although the SUP inflatable 1 has been described in the above embodiment, the SUP is limited to the SUP by using the inflatable structure and the manufacturing method thereof according to the present invention or the double membrane structure for forming the inflatable structure. Instead, various inflatable water slides can be formed. For example, the present invention may be applied to a floor mat that forms the bottom of an inflatable boat. Further, the present invention is applied not only to inflatables for water slides but also to inflatable structures such as agricultural houses, warehouses, and tents to connect ridges of roofs, corners connecting roofs and side walls, or side walls. The intersections such as the corners may be formed by the V-shaped cross section of the present invention. Further, the present invention may be applied to an inflatable container body such as a storage case, a bucket, a pool, etc., and the intersecting portion of the bottom portion and the side wall portion may be formed with the V-shaped cross section of the present invention. Besides, the present invention can be variously modified within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 SUP inflatable 1a Lap adhesion part 1b Opposing part 10 Double film body 11 Airtight film body 11' Airtight film body 11a Cut end 11b Cut end 12 Airtight film body 2 Airtight film body (resin sheet)
3 Airtight membrane (resin sheet)

The present invention relates to an inflatable structure used for a stand-up paddle board (hereinafter referred to as SUP) and the like, an inflatable manufacturing method, and a double film structure .

Conventionally, as a substrate that constitutes a board-shaped inflatable in which a high-pressure pressurized gas such as SUP is enclosed, two airtight film bodies are made to face each other, and these facing surfaces have a large number of substantially constant lengths. A double-layered membrane is used, which is interconnected by a string (String), and the distance between the membranes is regulated by the string. Specifically, high-pressure gas is sealed by air-tightening the peripheral portions of the double film body, such as connecting the peripheral portions of the air-tight film bodies facing each other with another band-shaped air-tight film body. Inflatable possible.

When such an inflatable is filled with a pressurized gas, the two airtight film bodies forming the double film body are separated from each other by the internal pressure, while the two airtight film bodies are pulled to each other through the string to have a substantially constant thickness. To define a flat plate. In particular, in hydroplane inflatables such as SUP, high-pressure gas of about 12 to 15 PSI is filled in order to increase the resistance to deformation, but the action of the string does not make a rounded shape, but a plate shape suitable for a person to ride on. Maintained.

By the way, when not only a person rides but also the gliding performance (especially the gliding speed) is taken into consideration, the bottom of the SUP, which is the gliding surface, is not simply a flat shape, but a cross section orthogonal to the front-back direction (sliding direction). It is preferable that it projects so as to have a V-shape. In this regard, if the string length can be freely set by changing the string length for each part on the double film body, it is possible to provide the V-shaped protruding portion, but it is not easy in terms of technology and profitability. Therefore, as a means for forming an inflatable structure with a V-shape added by using a double film body in which airtight film bodies are connected by strings and kept at a constant interval, the following (1) to (3) are used. Various technologies have been proposed.

(1) As shown in FIG. 4( a ), by applying a force to the inflatable 100 defined in a flat shape by the double film body whose spacing is regulated by the string S, the inflatable 100 is bent into a V shape, As shown in FIG. 6B, the folded-back portion 100a on the valley side is brought into close contact with each other and fixed by adhesion to form a V-shape. Further, the reinforcing cloth 101 is attached so as to straddle the upper surfaces on both sides of the adhered and fixed contact portion (see, for example, Patent Document 1).

(2) In the inflatable 200 defined in a flat shape by the double membrane body whose spacing is regulated by a large number of strings S, as shown in FIG. 5A, along the center line extending in the sliding direction, the airtight membrane is formed. The upper sheet 200a and the lower sheet 200b, which are formed of a body, are sewn together to form a linear contact portion 200c. Then, as shown in FIG. 6B, another strip-shaped sheet 201, 202 made of an airtight film body is attached, and the close contact portion 200c is covered from the upper surface and the lower surface side to prevent gas leakage from the needle hole. To do. At this time, by pulling the top sheet 200a toward the center, when the gas is filled, the top sheets pull each other through the strip sheet 201 as shown in FIG. Is bent into a V shape (see, for example, Patent Document 2).

(3) As shown in FIG. 6, two inflatables 301 and 302, which are defined in a flat shape by a double film body whose spacing is regulated by a string S, are arranged so that their one end surfaces 301a and 302a are adjacent to each other. Then, the upper surface side 301b and 302b and the lower surface side 301c and 302c are hermetically connected by two airtight film bodies 303 and 304 (304 is longer than 303) having different lengths, respectively, to form an inflatable body. Form 300. In addition, the end faces 301a and 302a to be arranged adjacent to each other are formed in advance with a mesh. When the whole inflatable 300 is ventilated by being filled with a pressurized gas, a V-shaped angle is formed due to the difference in length of the airtight film bodies 303 and 304 connecting the upper surface side and the lower surface side (for example, Patent Document 1). See 3.).

JP 2001-82004 A JP, 2011-225008, A Japanese Patent Publication No. 8-1106

According to the inflatable structures of the above-mentioned related arts (1) to (3), it is possible to form an inflatable body having a V-shaped cross section by using as a base material a double film body that is regulated by a large number of strings so as to keep a constant interval. You can, but there are the following problems.

In the related art (1), the inflatable 100 is bent and the folded-back portion 100a on the valley side thereof is adhesively fixed. However, the airtight film body that encloses the high-pressure gas is lined with an airtight resin sheet or a cloth Since it is thick and has high rigidity such as coating with a resin, it is difficult to completely adhere the folded-back portion, and defective adhesion is likely to occur. Moreover, the internal pressure of the high-pressure gas acts to spread the folded-back portion 100a and peel off the adhesive portion. The reinforcing cloth 101 also has V-shaped angles on the attaching surfaces 101a and 101b, and is easily pulled by pulling in a direction in which they are peeled from each other. In particular, when a person rides on the SUP or the like and slides on the water, a load is repeatedly applied to the adhesive portion, and the adhesive portion is more easily peeled off. In addition, the V-shaped recess 101c on the upper surface has a problem that the occupant cannot place his/her feet stably.

In the prior art (2), the band-shaped sheets 201 and 202 have to be adhered on both sides across the adhesion part 200c, and the adhesion surface is elongated and there are four places, so that the burden of managing the attachment margin and the adhesion is large, There is concern about gas leakage due to poor work. In particular, since the airtight film body that encloses the high-pressure gas has high rigidity and cannot completely flatten the attracted top sheet 200a, it is considerably difficult to bond the strip-shaped sheet thereon. In addition, since the strip-shaped sheets 201 and 202 have no strings, the adhesive portion receives all the internal pressure of the high-pressure gas and is easily peeled off. Especially when it is used as a SUP or the like, it becomes easier to peel due to the repeated action of the load. Since the belt-like sheets 201 and 202 swell like ridges as shown in FIG. 5(c), when used for SUP or the like, the rider cannot stably place his/her feet on the upper surface side, and the lower end has the protruding end above the water. There is a problem that the adhesion is easily peeled off by sliding or being dragged on land.

In the above-mentioned conventional technique (3), the inflatables 301 and 302 are connected by the two airtight film bodies 303 and 304, but the connecting portion is elongated and there are four places, and the manufacturing load is heavy. Moreover, since the airtight film bodies 303 and 304 to be connected do not have strings like the strip-shaped sheet of the above-mentioned conventional technique (2), the adhesion may be easily peeled off by the internal pressure of the high-pressure gas. Further, since the airtight film bodies 303 and 304 swell in a ridge shape with high-pressure air, when used for SUP or the like, the rider cannot stably place his/her feet on the upper surface side as in the above-mentioned conventional technique (2). On the lower surface side, there is a problem that the adhesion is likely to be peeled off when the tip is slid over the water or dragged on land. In addition, the cost burden for forming the end portions 301a and 302a with a mesh is considerably large.

In view of the above situation, the present invention can be easily and inexpensively manufactured by using two airtight film bodies that are opposed to each other and are connected so as to regulate the interval with a large number of strings, and can be bonded. unlikely to occur in the peeling, when used as SUP, etc., easily place the riders feet, there is no fear of peeling adhesion by be dragged a hydroplane and bottom, inflatable structure comprising a V-shaped cross-section, inflatable manufacture of It is an object to provide a method and a bilayer structure .

The invention of claim 1 is an inflatable structure in which pressurized air is enclosed between double membranes, wherein the double membranes are connected so as to face each other and to regulate the spacing by a large number of strings. One in which one of the two airtight film bodies is linearly cut into a plurality of airtight film body pieces, the string connected to the cut ends is cut or removed, and the cut end parts are overlapped and bonded. And an inflatable structure characterized by having a V-shaped cross section .

According to a second aspect of the present invention, one of the two airtight film bodies that are opposed to each other and are connected by a number of strings so as to regulate the distance is linearly cut into a plurality of airtight film body pieces, and the cut end thereof is cut. It is formed by cutting or removing a string connected to a portion and air-tightly processing a peripheral edge portion of a double film body formed by laminating and adhering the cut end portions , and having a V-shaped cross section. To provide an inflatable structure.

The invention of claim 3 is an inflatable structure for hydroplane, wherein the width of the overlapped adhesive is formed so as to change along the sliding direction, so that the bending angle changes along the sliding direction. The inflatable structure according to claim 1 or 2, wherein the inflatable structure has a V-shaped cross section .

According to a fourth aspect of the present invention, there is provided an inflatable structure for hydroplane sliding, wherein the V-shaped cross section is formed by adhering the cutting ends so that the cutting lines are angled with respect to each other. 3. The inflatable structure according to claim 1, wherein the bending angle changes along the sliding direction .

The invention of claim 5 provides the inflatable structure according to any one of claims 1 to 4 , wherein an airtight film body covering the seam of the lapped adhesive portion is attached.

According to a sixth aspect of the present invention, there is provided an inflatable manufacturing method using two airtight film bodies which face each other and are connected to each other by a large number of strings so as to regulate the intervals, wherein one of the airtight film bodies is provided in plural. Of the airtight film body of the above, and the string connected to the cut end is cut or removed, and the cut ends are overlapped and adhered to each other, and the adhered airtight film and the other airtight film the periphery of the sex film body using airtightly coupled, to provide a method of manufacturing an inflator b le, characterized in that shall have a cross section of the V-shape.

According to the invention of claim 7, in a double membrane structure for forming an inflatable structure having a V-shaped cross section capable of enclosing pressurized air, the distance is regulated by a plurality of strings facing each other. One of the two airtight film bodies connected as described above is linearly cut into a plurality of airtight film body pieces to cut or remove the string connected to the cut end and overlap the cut end parts. Provided is a double film structure characterized by being bonded together.

According to the present invention, the following excellent effects are exhibited. One of the two airtight film bodies that are opposed to each other and are connected by a number of strings so as to keep a constant interval is cut over the entire length thereof, and cut into a plurality of airtight film body pieces, and the cut end thereof is cut. By cutting or removing the string connected to the part and pulling the cut ends together, and adhering them by stacking them on top of each other, when pressurized air is enclosed between them, the stacking of one airtight film body The inflatable bends in accordance with the difference in width between the bonded portion and the length in the width of the other airtight membrane that was opposite to the cut end, and the V-shaped inflatable extends over the entire length of the inflatable. A cross section can be formed. The V-shaped angle can be easily set by appropriately adjusting the width dimension of the overlapping adhesive portion.

That is, it suffices to provide a cut portion on one side of the double-layered film body and overlap the cut-off end portions to bond them together. The inflatable having a V-shaped cross section can be easily and inexpensively manufactured without performing a troublesome work such as attaching another film on the flexible film. Further, even if a pressure of pressurized gas is applied to the superposed adhesive portion, it does not act in the direction of peeling the adhesive surface, and peeling of the adhesive is less likely to occur as compared with the above-mentioned prior art.

When the inflatable device according to the above invention is used for SUP or the like, the lapped adhesive part has a double structure to increase rigidity and is hard to be deformed, and a flat part continuous to the inclined parts on both sides defined by the string is formed. By doing so, the rider can rest their feet relatively stably. Since there is no adhesive portion serving as a joint in the opposing portion protruding in the V-shape, even if a load is caused by sliding on water or dragging on land, gas leakage due to adhesive peeling is unlikely to occur.

By combining the inflatable structure, not only a plate-like object such as SUP, but also a boat or the like in which, for example, the bottom portion and the side wall portions or the intersections of the side wall portions are formed in the V shape can be manufactured. In addition, the ridge of the roof of the inflatable structure, the corners connecting the roof and the side wall or the corners connecting the side walls, the intersection of the bottom and the side wall of the inflatable container are formed in the V shape, etc. Other articles and structures may be manufactured.

By cutting or removing a string which is connected to the disconnected end, pulling by string no longer acts on the facing portion which faces the cutting edge, the counter section ridges inside pressure of the high-pressure gas sealed Protruding in a shape. This further improves the water gliding performance when the inflatable structure is used for the SUP, the bottom of the boat, or the like. In addition, since the lapped adhesive portion has a double structure and increased rigidity, it does not easily project even when a high pressure is applied, and it does not hinder the rider from placing his/her feet.

To guess the weight together adhesive portion, or marks have is left of a piece or of a string has been fixed, because the inner surface of the inflatable is or has been lined with a cloth for strength up the film body, just from the seam Although it is feared that various gas leaks will occur, it can be completely sealed by covering the joint with another airtight membrane. Since the airtight film body is thick due to the string or the traces of adhesion of the string or the lined cloth, the step of the seam of the superposition adhesion part is large, and the foot of the rider is easily caught when used as SUP, etc., If it is originally covered with a thin airtight film body without a string or lining cloth, it is less likely to get caught and the appearance can be improved.

By using the double membrane structure according to the invention of claim 7, it is possible to easily and inexpensively form an inflatable having a V-shaped cross section capable of enclosing high-pressure pressurized gas.

The top view explaining the embodiment of the present invention. 1. XX sectional drawing of FIG. The top view explaining another embodiment of the present invention. Sectional drawing explaining prior art (1). Sectional drawing explaining prior art (2). Sectional drawing explaining prior art (3).

1 and 2 are diagrams for explaining an inflatable structure and a manufacturing method thereof according to the present invention, and more specifically, show a case of manufacturing an inflatable SUP using the inflatable structure according to the present invention. 2A to 2G correspond to XX cross sections of FIGS. 1A to 1G, respectively. 1 and 2, metal fittings for attaching accessory parts such as air supply/exhaust valves (air filling ports), fins, carrying handles, carrying webbings, leash cords, etc., and other accessory parts that are usually equipped in the SUP. Are omitted, and the description thereof will be omitted below.

In the inflatable structure and the manufacturing method thereof according to the present invention, the two airtight membranes facing each other are connected to each other by a large number of strings and the strings have a substantially constant length. The film body is used as a base material. This double membrane body constitutes an inflatable body in which the peripheral portions of the airtight membrane bodies which face each other are airtightly connected by a band-shaped airtight membrane body and the inside is sealed, and pressurized air is enclosed. Therefore, it is generally used to define a plate-shaped body having a substantially constant thickness according to the string length.

The airtight film forming the double film has high strength by covering the surface of the cloth with an airtight material such as resin or rubber or by bonding the cloth to an airtight sheet such as resin or rubber. It is configured so that it hardly expands or contracts. The backing cloth is used to reinforce the tensile load of the string. The string is also made of a material such as nylon or polyester so as to have high strength and hardly expands and contracts, and both ends thereof are adhesively fixed to the airtight membranes facing each other. As a result, the flat shape is maintained even if high-pressure pressurized air is enclosed, and an inflatable with high deformation resistance is constructed. Note that, in FIG. 2, the strings S are drawn in various lengths for convenience of drawing, but in practice, they are set to a substantially constant length as shown in FIG.

Now, in the case of manufacturing an inflatable SUP having a V-shaped cross section when pressurized air is enclosed using the inflatable structure of the present invention, as shown in FIG. 1(a) and FIG. 2(a). Then, a double film body 10 that is cut out to be long and thin (for example, a total length of about 3.2 m and a width of about 0.8 m) is prepared according to the plan view shape of the SUP to be manufactured. The double film body 10 is composed of two air-tight film bodies 11 and 12 which are bilaterally symmetric and have the same shape and size, and a large number of strings S which connect the opposing surfaces thereof and define the film body spacing. There is. The airtight film bodies 11 and 12 have an airtight resin sheet lined with a reinforcing cloth.

First, as shown in FIGS. 1(b) and 2(b), one of the airtightnesses on the upper side along the centerline CL extending in the longitudinal direction of the double membrane body 10, that is, the front-back (sliding) direction of the SUP. Only the flexible film body 11 is linearly cut with a blade or the like over its entire length. As a result, the airtight film body 11 remains connected to the other airtight film body 12 on the lower side by a large number of strings S, and the left and right airtight film bodies are separated by the straight cut portion C1. It is separated into pieces 11R and 11L.

Next, as shown in FIGS. 1C and 2C, in each of the airtight membrane body pieces 11R and 11L, cut end portions 11a and 11b having a predetermined width W extending along the cut portion C1 (see FIG. 1C). The string S that is connected to the strip-shaped portion indicated by hatching in (c) is cut with a blade or the like. As a result, the strip-shaped cut ends 11a and 11b (total width dimension 2W) at the center of the airtight film body 11 and the strip-shaped facing portion 1b (at the center of the airtight film body 12 facing each other) ( The connection by the string S having a width dimension of 2 W is eliminated.

The string S may be simply cut, but if the cut end of the string remains at the cut end, the bonding surface does not adhere to the next bonding step, and it becomes difficult to secure airtightness. Therefore, it is preferable that at least one of the cut ends 11b where the surface to which the strings are connected is the adhesive surface is removed by cutting or peeling off the string S at the root. The portions other than the cut end portion 1a (the cut end portion 1b, the facing portion 1b) may be removed because the remaining cut edges may be caught in the bonding surface and interfere with the bonding work.

In the bonding step, as shown in FIG. 1D and FIG. 2D, the left and right airtight film body pieces 11R and 11L are drawn to each other, and the cut ends 11a and 11b having the width dimension W are vertically stacked. It is integrated again by adhering in a hermetically sealed manner. As a result, in the central portion in the lateral width direction, the airtight film body 11' in which the strip-shaped overlapping adhesive portion 1a having the width dimension W (hatched portion in FIG. 2D) extends over the entire length is formed. As a result, the airtight film body 11' is packed from the original airtight film body 11 such that the width dimension of the central portion in the lateral width direction is from 2W (cut end portions 11a, 11b) to W (lapped adhesive portion 1a). On the other hand, in the airtight film body 12, the width dimension of the central portion (opposing portion 1b) in the lateral width direction does not change at 2 W, and except the central portion, the upper airtight film body 11' and the lower airtight film body are formed. A double film structure in which 12 are connected by the string S is formed.

Then, as shown in FIGS. 1(e) and 2(e), the width is larger than that of the overlapping adhesive portion 1a so as to cover the overlapping adhesive portion 1a over the entire length of the airtight film body 11'. A wide band-shaped airtight film body 2 is attached. Since the airtight film body 2 does not have a string, a backing cloth material such as the airtight film bodies 11 and 12 is not used, and although the thickness is small by that amount, it is made of PVC or the like and has high strength and is difficult to stretch. It is an airtight resin sheet. The first purpose of adhering the airtight film body 2 is to seal the gas leaking from the superposition adhesive section 1a through the linear joint t appearing on the outer side thereof. The fibers of the backing cloth material appear on the inner surface (back surface) of the airtight film bodies 11 and 12, and even if they are completely adhered and airtightly adhered, gas slightly leaks out from the fiber portions. This is because there are times when they come. In addition, by covering the seam t with the airtight film body 2, it is possible to prevent the seam t from being caught by the step and curling of the adhesive part starting from the seam t, and to suppress the protrusion due to the swelling of the superposition adhesive part 1a due to internal pressure. Be done.

Finally, as shown in FIG. 1(f) and FIG. 2(f), the peripheral portions of both the upper airtight film body 11' and the lower airtight film body 12 are interconnected. The strip-shaped airtight film body 3 is airtightly adhered so as to be. The airtight film body 3 is a high-strength, non-stretchable airtight resin sheet made of PVC or the like similar to the airtight film body 2, has no strings and lining cloth material, and does not leak gas from an adhesive surface or the like. .. As a result, the peripheral portion of the double membrane body 10 is airtightly processed, and the inside is sealed to complete the SUP inflatable 1 capable of enclosing pressurized air. The band-shaped airtight membrane body 3 has a vertical width dimension defined by the string S as a bonding margin dimension for the airtight membrane bodies 11 ′ and 12 so as not to hinder the expansion of the SUP inflatable 1 when the pressurized air is enclosed. It is set longer than the dimension including the thickness dimension.

When pressurized air is introduced into the SUP inflatable 1 from a supply/exhaust valve (not shown), the internal pressure causes the double membrane 10 to expand as shown in FIGS. The two airtight film bodies 11 ′ and 12 constituting each other are separated from each other, but in the portions other than the overlapping adhesion portion 1 a and the facing portion 1 b located in the central portions thereof, the airtightness of the same shape and size is the same in the vertical direction. The film body portions pull each other through a large number of strings S to define a flat plate-like body having a substantially constant thickness.

On the other hand, in the central portion, the overlapping adhesive portion 1a (width dimension W) and the facing portion 1b (width dimension 2W) have different width dimension lengths, so that as shown in FIG. A flat plate-shaped body that is bent toward the short overlapping adhesive portion 1a side (upper side) and is continuous from the central portion to both the left and right sides thereof has a substantially constant thickness, and the SUP inflatable 1 as a whole has a V-shaped cross section. Will be formed. By using the lower airtight film body 12 protruding in a V-shape as the bottom surface of the SUP, superior water gliding performance can be obtained as compared with a mere flat inflatable.

In the present embodiment, since the string S is removed from the superposition adhesive portion 1a and the facing portion 1b, and there is no action of restricting the film body interval between them, the string S is sealed when high-pressure pressurized gas is enclosed. As compared with the other portion whose interval is defined by, it is easier to swell in the thickness direction.

However, since the upper overlapping adhesive portion 1a has a double structure in which the cut end portions 11a and 11b are vertically overlapped and adhered, the rigidity is increased and the width dimension is shortened (2W→W). It is hard to be deformed and is covered with the airtight film body 2, so that the bulge is suppressed to a very small extent. As a result, it is maintained in a substantially flat shape and continues relatively smoothly to the inclined constant thickness portions on both sides, so that the person riding the SUP can place his/her feet relatively stably. Further, since the airtight film body 2 is covered, catching due to the step of the seam t is also prevented, and at that point, the rider can easily put his/her feet. Since the internal pressure does not directly act on the lapped adhesive portion 1a in the direction of peeling the adhesive surface, peeling of the adhesive hardly occurs.

On the other hand, the lower facing portion 1b is formed of only one sheet of the airtight film body 12 and has a long lateral width, which easily swells by the action of the pressurized gas, and thus is shown in FIG. 2(g). In this way, a protruding portion that extends in a ridge shape in the sliding direction of the SUP is formed. This protrusion can further improve the water gliding performance of the SUP like a keel on the bottom of a boat. Although the facing portion 1b forms a projecting portion, since it is a single piece and has no seam, there is no fear that the bonded portion will be curled up due to water gliding or dragging on land. In order to prevent damage to the film body itself, a protective film body may be attached to cover the entire airtight film body 12 or only a part such as the facing portion 1a.

As described above, according to the present invention, one side of the film body 11 of the double-layered film body 10 is linearly cut, and the cut end portions 11a and 11b are simply overlapped and bonded to each other. The character-shaped SUP inflatable 1 can be manufactured easily and inexpensively. Since the angle of the V-shape is determined based on the difference in width between the overlapping adhesive portion 1a and the facing portion 1b, the bending angle can be adjusted by adjusting the width dimension W of the cut end portions 11a and 11b to be adhesively laminated. Can be set appropriately. By partially cutting the airtight film body from the cut end portions 11a and 11b, the width dimension of the superposition adhesive portion 1a can be further reduced, so that the airtight film body 12 on the lower side is opposed. It is also possible to adjust the bending angle appropriately by adjusting the difference between the width and the length of the portion.

(Other embodiments)
In the above-described embodiment, the upper airtight film body 11 is separated into two sheets, but as shown in FIG. 3A, the airtight film body 11 is not separated, and only a part of the entire length direction is linear. 3C, the string of the cut end portions 11c and 11d on both sides of the cut portion C2 is removed to form the cut portion C2, as shown in FIG. 3C. Alternatively, the cut end portions 11c and 11d may be drawn together, and the cut end portions 11c and 11d may be vertically overlapped and bonded so as to form a fan shape in a plan view. As a result, an inflatable body having a V-shaped cross section formed in the front portion of the double film body 10 that is superposed and bonded and a flat cross section formed in the other rear portion is manufactured. You can It should be noted that cuts are provided on both sides of the airtight film body 11 with the center part in the front-rear direction sandwiched therebetween, and cut ends of the cuts are overlapped and adhered to each other to form a V-shaped cross-section on both front and rear sides. It is also possible to manufacture an inflatable in which a flat cross section is formed in the central portion.

In the above-described embodiment, the cut portion C1 is provided only at one place along the center line CL of the airtight film body 11, but it is not necessarily required to be provided along the center line CL, and the cut portions are provided at a plurality of places. As a result, a cross section formed by combining a plurality of V-shaped cross sections may be formed, for example, a U-shaped cross section or a W-shaped cross section. Further, in the above embodiment, the cut ends 1a and 1b are overlapped and adhered so that the cut lines thereof are parallel, but the cut lines are obliquely overlapped and adhered so that the cut lines can be mutually angled, You may form the superposition|adhesion adhesive part which a width|variety changes along a full length direction. Thereby, the bending angle of the inflatable can be changed along the entire length direction. Further, in the above embodiment, all the strings S of the cut end portions 11a and 11b to be the overlapping adhesive portion 1a are cut or removed, but the cut end portion having the surface to which the strings S are connected as the adhesive surface is used. It is also possible to cut or remove only 11b. In the above-mentioned embodiment, the airtight film bodies 2 and 3 are made of resin sheets without a backing cloth, but those using cloth may be adopted. For example, a resin sheet may be attached to the surfaces to be bonded. The resin may be covered to ensure the airtightness of the adhesive portion.

Although the SUP inflatable 1 has been described in the above embodiment, the SUP is limited to the SUP by using the inflatable structure and the manufacturing method thereof according to the present invention or the double membrane structure for forming the inflatable structure. Instead, various inflatable water slides can be formed. For example, the present invention may be applied to a floor mat that forms the bottom of an inflatable boat. Further, the present invention is applied not only to inflatables for water slides but also to inflatable structures such as agricultural houses, warehouses, and tents to connect ridges of roofs, corners connecting roofs and side walls, or side walls. The intersections such as the corners may be formed by the V-shaped cross section of the present invention. Further, the present invention may be applied to an inflatable container body such as a storage case, a bucket, a pool, etc., and the intersecting portion of the bottom portion and the side wall portion may be formed with the V-shaped cross section of the present invention. Besides, the present invention can be variously modified within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 SUP inflatable 1a Lap adhesion part 1b Opposing part 10 Double film body 11 Airtight film body 11' Airtight film body 11a Cut end 11b Cut end 12 Airtight film body 2 Airtight film body (resin sheet)
3 Airtight membrane (resin sheet)

Claims (7)

An inflatable structure in which pressurized air is enclosed between double membranes, wherein the double membranes are two airtight membranes that face each other and are connected by a number of strings so as to regulate the distance. An inflatable structure, characterized in that one side is separated into a plurality of airtight film body pieces, and the cut ends are overlapped and bonded. One of two airtight film bodies which are opposed to each other and are connected so as to regulate the spacing by a large number of strings is separated into a plurality of airtight film body pieces, and cut ends thereof are overlapped and bonded together. An inflatable structure characterized in that the periphery of the membrane is airtightly processed. The inflatable structure according to claim 1 or 2, wherein the strings connected to the cut ends to be overlapped and bonded are cut or removed. The inflatable structure according to any one of claims 1 to 3, wherein an airtight film body covering the seam of the lapped adhesive portion is attached. A method of manufacturing an inflatable device, which comprises two airtight film bodies which are opposed to each other and are connected to each other so as to regulate a distance with a large number of strings,
One of the airtight film bodies is separated into a plurality of airtight film body pieces, and the cut ends are overlapped and adhered to each other, and the peripheral portions of the adhered airtight film body and the other airtight film body are airtight. A method for manufacturing an inflatable structure, which is used by connecting to an inflatable structure. The method according to claim 5, wherein the string connected to the cut end is cut or removed. A double membrane structure for forming an inflatable structure having a V-shaped cross section capable of enclosing pressurized air,
One of the two airtight membranes, which are opposed to each other and are connected so as to regulate the spacing by a large number of strings, is separated into a plurality of airtight membrane pieces, and the cut ends are overlapped and bonded. A double film structure characterized by.

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