JP2012012894A - Film body and multiple film structure using the film body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lengthen a lifetime of a film body and a multiple film structure using the film body even if an outer edge of a belt-like film material group belonging to the film body is folded back and heat-welded in order to improve the strength of the outer edge of the film body.SOLUTION: A film body 8 has a plurality of band-like film materials 12 that are placed in parallel along one-direction A. Opposed edge parts 13 and 13 of the band-like film materials 12 and 12 adjacent to each other are overlapped with each other and subjected to heat-welding W1. An outer edge part 17 of a band-like film material 12 group in a longitudinal direction B of each band-like film material 12 has a base part side 17a to which an end edge side 17b is folded back, and the base part side 17a and the end edge side 17b are subjected to heat-welding W2. An opening 26 is formed at an overlapped part of both the opposed edge parts 13 and 13 and the end edge side 17b in the base part side 17a.

Description

  The present invention relates to a film body formed by thermally welding a plurality of strip-shaped film materials arranged side by side, and a multilayer film structure using the film body.

  Conventionally, there is a multilayer film structure described in Patent Document 1 below. According to this publication, the multiple membrane structures are provided with outer membrane bodies that are stacked on top of each other. Among these, the outer edge portions of the outer membrane body are coupled to each other, and are coupled to the base side of the structure by a coupling tool. The inner and outer membrane bodies are inflated by enclosing air in the space between them, whereby tension is applied to the inner and outer membrane bodies. And by this tension | tensile_strength, the said outer membrane body is hold | maintained at a predetermined shape so that the roof and ceiling of the said structure may be comprised.

  On the other hand, the following has been proposed as the film body. That is, the film body has a strip-shaped film material arranged in parallel along one direction in the surface direction. The opposing edge portions of the two strip-shaped film materials adjacent to each other in the one direction are overlapped, and the opposing edge portions are thermally welded to each other. Moreover, the edge side is turned up with respect to the base side which comprises the outer edge part of these strip | belt-shaped film | membrane group in the longitudinal direction of each said strip | belt-shaped film | membrane material, These base part side and edge side are heat-welded mutually.

  The band-shaped film material is formed continuously in the longitudinal direction with a constant width by a molding machine, and then the film cut to a desired length is integrated by thermal welding to be used for forming the film body. The Moreover, as described above, the strength of the outer edge portion of the film body is improved by folding the end edge side to the base side of the outer edge portion of the band-shaped film material group and performing heat welding. As a result, the outer edge of the film body is firmly fixed to the substrate side of the structure.

Japanese Utility Model Publication No. 6-10561

  By the way, as described above, when the outer edge portion of the film-like film group is folded and heat-welded so as to firmly fix the outer edge portion of the film body to the substrate side of the structure, they are overlapped with each other on the base portion side. The film material on the edge side is further overlapped with the film materials on both the opposite edge portions, resulting in the formation of multiple welds.

  Then, firstly, in the transition part from the multiple weld part to the non-welded film material adjacent thereto, for example, the transition from the weld part of the double film material to one film material adjacent thereto Compared with the part, the change in the thickness dimension becomes large, and the strength tends to change suddenly in this transition part.

  Second, in the multiple welding portion, first, the film materials on the opposite edge portions are welded, and then the film material on the edge side is overlapped on the both film materials to form the film materials. Further, they are integrally heat-welded. For this reason, since both the film | membrane materials of the said opposing edge part are repeatedly heat-welded in the same location, there exists a possibility that a base material may be damaged and the intensity | strength of a part of said multiple welding part may fall.

  In the first and second cases, the external force applied from the substrate side to the film body fixed on the substrate side of the structure or the film body expanded as a multi-layer structure Due to the applied tension, stress concentration tends to occur in a part of the transition part and the multiple weld part. Therefore, these transition portions and multiple weld portions are easily damaged, and the life of the film body may be reduced.

  The present invention has been made paying attention to the above-described circumstances, and the object of the present invention is to fold the outer edge portion of the band-shaped film material group included in the film body in order to improve the strength of the outer edge portion of the film body. Even when the film body is thermally welded, the life of the film body and the multilayer structure using the film body is to be improved.

The invention according to claim 1 includes a plurality of strip-shaped film members 12 arranged in parallel along one direction A, and both opposing edge portions 13 of the two strip-shaped film materials 12 and 12 adjacent to each other in the one direction A. , 13 are overlapped, and these opposing edge portions 13, 13 are heat welded W1 to each other, with respect to the base side 17a constituting the outer edge portion 17 of these strip-like film members 12 in the longitudinal direction B of the respective strip-like membrane materials 12. In the film body in which the edge side 17b is folded back and the base side 17a and the edge side 17b are thermally welded W2 to each other,
The film body is characterized in that an opening 26 is formed in a portion where the end edge side 17b overlaps the opposing edge portions 13 and 13 on the base side 17a.

  The invention according to claim 2 is provided with other film bodies 9, 10 overlaid on the film body 8 of claim 1, and the outer edge portion 20 of the film body 8 having the base side 17 a and the edge side 17 b and the other The outer peripheral portions 21 and 22 of the film bodies 9 and 10 are overlapped, and the outer peripheral portions 20, 21 and 22 are heat-welded W2 to each other.

  The invention according to claim 3 is characterized in that the other film body 10 has a strip-shaped film material 12 arranged in parallel along one other direction C in the surface direction, and in the other one direction C. The opposing edge portions 13 and 13 of the adjacent strip-like film materials 12 and 12 are overlapped and thermally welded W1, and gas is sealed in the space 24 between the film body 8 and the other film body 10. The multilayer structure according to claim 2, wherein:

The invention according to claim 4 is provided with a film body 8 and a plurality of other film bodies 9 and 10 that are stacked on each other, and the film body 8 is unidirectional in the surface direction, as particularly illustrated in FIG. A plurality of strip-shaped film materials 12, 12 arranged side by side along A, and both opposing edge portions 13, 13 of the two strip-shaped film materials 12, 12 adjacent to each other in the one direction A are overlapped. The two band-shaped film materials 12 and 12 are heat-welded W1 to each other, and the edge side 17b is folded back with respect to the base side 17a constituting the outer edge part 17 of the band-shaped film material 12 group in the longitudinal direction B of each band-shaped film material 12 and 12. The outer edge portion 20 of the film body 8 having the base side 17a and the edge side 17b is overlapped with the outer edge portions of the other film bodies, and the outer edge portions 20, 21, and 22 are heat-welded to each other. In the multilayer structure to be
A multi-layered film structure in which an opening 27 is formed in a portion where the outer edge portion 21 of the other film body 9 adjacent to the film body 8 overlaps the opposite edge portions 13 and 13 on the base side 17a. Is the body.

  The invention according to claim 5 is characterized in that the outer edge portions 21 and 22 of the other film bodies 9 and 10 are inserted between the base side 17a and the end edge side 17b of the outer edge portion 20 of the film body 8. A multilayer structure according to any one of claims 2 to 4.

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

  The invention according to claim 1 has a plurality of strip-shaped film materials arranged side by side along one direction, and both opposing edges of the two strip-shaped film materials adjacent to each other in the one direction are overlapped with each other. The edge portions are heat-welded to each other, the edge side is folded back with respect to the base side constituting the outer edge portion of the band-like film material group in the longitudinal direction of each of the band-like film materials, and the base side and the edge side are heat-welded to each other. ing.

  That is, the strength of the outer edge portion of the film body is improved by folding the end edge side to the base side constituting the outer edge portion of the band-shaped film material group included in the film body and performing thermal welding.

  And the opening is formed in the part which the said edge side overlaps with respect to the said both opposing edge part in the said base part side.

  For this reason, as described above, even when the strength of the outer edge portion of the film body is improved, the film materials of the opposite edge portions overlapped with each other on the base side are further folded by the folding on the edge side. It is prevented by the formation of the opening described above that the film material which is a part on the edge side is overlapped. That is, even if the end edge side is folded, the formation of multiple welds is suppressed.

  Here, as described in the prior art, if the above-described multiple welded portion is formed, the strength at the transition portion from the multiple welded portion to the non-welded portion adjacent thereto is increased. It tends to change suddenly, and there is a possibility that the strength of a part of the multiple welded portion is lowered due to repeated thermal welding at the same location in the multiple welded portion. In this case, stress concentration is likely to occur in a part of the transition part and the multiple weld part, and there is a possibility that the part is likely to be damaged. However, according to the above invention, as described above, the formation of the multiple welds is suppressed, so that the damage based on the stress concentration is prevented in advance. Therefore, the lifetime improvement of this film body is achieved.

  According to a second aspect of the present invention, there is provided another film body overlaid on the film body of the first aspect, wherein an outer edge portion of the film body having the base side and an edge side and an outer edge portion of the other film body are provided. These outer edge portions are heat-welded to each other.

  Here, when forming the multi-layer structure, if the outer edge portions of the film body and other film bodies are overlapped with each other and these outer edge portions are thermally welded to each other, the above-described multi-weld portion can be formed. The sex becomes higher. However, according to the said invention, formation of the said multiple welding part is suppressed by forming opening. Therefore, the lifetime of each film body is improved, that is, the lifetime of the multilayer structure is improved.

  According to a third aspect of the present invention, the other film body includes a strip-shaped film material in which a plurality of the film bodies are juxtaposed along one other direction in the surface direction, and both the strips adjacent to each other in the other one direction. Both opposing edges of the film material are overlapped and thermally welded, and gas is sealed in the space between the film body and the other film body.

  Here, as described above, in the film body and the other film bodies, a gas is sealed in the space between them and expanded, whereby tension is applied to each of the film bodies. In this case, as described above, the other film bodies have substantially the same configuration as the above-described film bodies, and hence tension is applied to each film body in a balanced manner. Then, by applying such tension, the multi-membrane structure constituted by these film bodies can be held in a desired shape such as a roof, a ceiling, and a wall of the structure.

  The invention of claim 4 is provided with a film body that is stacked on top of each other and a plurality of other film bodies, and the film body includes a strip-shaped film material that is juxtaposed along one direction in the surface direction. Then, the opposing edge portions of the two band-shaped film materials adjacent to each other in the one direction are overlapped and the two band-shaped film materials are thermally welded to each other, and the band-shaped film material group in the longitudinal direction of each of the band-shaped film materials The edge side is folded back with respect to the base side constituting the outer edge portion, and the outer edge portion of the film body having the base side and the edge side is overlapped with the outer edge portion of each of the other film bodies, so that each outer edge portion is They are heat welded together.

  In other words, in a multi-layered film structure provided with a film body that is stacked on top of each other and a plurality of other film bodies, the edge side is folded back with respect to the base side that forms the outer edge of the band-shaped film material group that the film body has By heat-welding, the strength of the outer edge portion of the multilayer structure is improved.

  And the opening is formed in the part which the outer edge part of the other film body adjacent to the said film body overlaps with the said opposing edge part in the said base side.

  For this reason, as described above, even when the strength of the outer edge portion of the multilayer structure is improved, both the edge side and the other side of the film material on the opposite edge portions that are overlapped with each other on the base side are further provided. It is prevented by the formation of the opening described above that each film material is overlapped with the outer edge of the film body. That is, even if the outer edge portion of the other film body is overlapped in addition to the folding at the end edge side of the band-shaped film material group, the formation of multiple welds is suppressed.

  Here, as described in the prior art, if the above-described multiple welded portion is formed, the strength at the transition portion from the multiple welded portion to the non-welded portion adjacent thereto is increased. It tends to change suddenly, and there is a possibility that the strength of a part of the multiple welded portion is lowered due to repeated thermal welding at the same location in the multiple welded portion. In this case, stress concentration is likely to occur in a part of the transition part and the multiple weld part, and there is a possibility that the part is likely to be damaged. However, according to the above invention, as described above, the formation of the multiple welds is suppressed, so that the damage based on the stress concentration is prevented in advance. Therefore, the lifetime of each film body is improved, that is, the lifetime of the multilayer structure is improved.

  According to a fifth aspect of the present invention, the outer edge portion of the other film body is inserted between the base side and the end edge side of the outer edge portion of the film body.

  For this reason, since the outer edge part of the other film body is sandwiched between the base side and the end edge side of the outer edge part of the film body which is an integral object, the mutual bonding strength of the outer edge parts of the respective film bodies Will improve. Accordingly, the life of each film body is improved correspondingly, that is, the life of the multilayer structure is improved.

1 is a partial plan development view of a multilayer structure showing Example 1. FIG. FIG. 3 is a side view of a structure that shows Example 1 and uses a multilayer structure. FIG. 3 is a plan view of a structure that shows Example 1 and uses a multilayer structure. FIG. 4 shows Example 1 and is an enlarged cross-sectional view taken along line IV-IV in FIG. 3. FIG. 3 is a partial perspective development view of the multilayer structure showing the first embodiment. FIG. 5 is a partial development view of a multilayer structure in a diagram corresponding to FIG.

  In order to improve the strength of the outer edge portion of the film body, the outer edge portion of the band-shaped film material group included in the film body is folded and thermally welded to the film body of the present invention and the multilayer film structure using the film body. Even in this case, in order to achieve the purpose of achieving the improvement of the lifetime of this film body and the multilayer film structure using this film body, the form for carrying out the present invention is as follows. That's right.

  That is, the film body has a strip-shaped film material arranged in parallel along one direction in the surface direction. The opposing edge portions of the two band-shaped film materials adjacent to each other in the one direction are overlapped and these opposing edge portions are thermally welded to each other. The edge side is folded back with respect to the base side constituting the outer edge portion of the band-like film material group in the longitudinal direction of each band-like film material, and the base side and the edge side are heat-welded to each other. An opening is formed in a portion where the end edge side overlaps the opposite edge portions on the base side.

  In order to describe the present invention in more detail, the first embodiment will be described with reference to FIGS.

  In the figure, reference numeral 1 denotes a structure 1 installed on the ground. This structure 1 is installed on a plurality of (four) pillars 2 standing on the ground and the upper ends of these pillars 2 and is viewed in plan view. Then, a plurality of beams 3 framed in a rectangular shape, and horizontally extending within the frames of these beams 3, the outer edge portions of which are connected to the beams 3 on the base side of the structure 1 by a connector 4, and the roof and And a multilayer structure 5 constituting the ceiling.

  The multilayer film structure 5 includes a film body 8 that extends in the horizontal direction, and a plurality of (two) other film bodies 9 and 10 that are positioned below the film body 8 and overlap the film body 8. It has. Each of these film bodies 8, 9, and 10 has a rectangular shape that is substantially the same shape and the same size as a whole in a plan view.

  The film body 8 includes a plurality of strip-shaped film materials 12 arranged in parallel along one direction A in the surface direction (horizontal direction), and each of the strip-shaped film materials 12 is a direction orthogonal to the one direction A. It extends linearly. The opposing edge portions 13 and 13 of the two band-shaped film materials 12 and 12 adjacent to each other in the one direction A are overlapped so as to be in surface contact with each other. The mating surfaces of these opposing edge portions 13 and 13 are entirely heat-welded W1 to each other, and the heat-welded W1 portion linearly extends in a strip shape along the longitudinal direction B of each strip-shaped film material 12. .

  The band-shaped film material 12 is a film made of ETFE, which is a fluororesin, but may be a film made of other fluororesin films such as PVDF, PFA, FEP, and other thermoplastic resins. Moreover, the base material may be a film material obtained by coating a woven fabric made of natural fibers, synthetic fibers, and inorganic fibers with a thermoplastic resin. In particular, when the film material is only a resin film having no base material, since it does not have a base material, it is easily affected by a decrease in strength due to the formation of multiple welds. Therefore, in this case, it is preferable to apply the present invention.

  The band-shaped film material 12 has a width dimension of about 1000 to 4000 mm. The thickness of the film material is about 0.1 to 1 mm, but it is preferable to apply the present invention when the thickness is preferably about 0.1 to 0.4 mm. The reason is that if the film material has a certain degree of thickness, even if multiple welds are formed, the strength decreases little due to the strength of the base material, but in the case of a thickness of about 0.1 to 0.4 mm, the base material This is because the strength of itself is limited, so that it is easily affected by a decrease in strength due to the formation of multiple welds. Moreover, the width dimension of both the opposing edge parts 13 and 13 piled up as mentioned above and heat-welded W1 is about 20-60 mm.

  The one direction A (and the longitudinal direction B) is inclined by approximately 45 ° with respect to the outer edge of the film body 8. The outer edge of the film body 8 and the one direction A (or the longitudinal direction B) are: They may be parallel to each other.

  Among the other film bodies 9 and 10, the lowermost film body 10 that forms the outer surface of the multilayer structure 5 is a band-shaped film having the same cross-sectional shape as each band-shaped film material 12 of the film body 8. A plurality of materials 12 are provided. The strip-shaped film members 12 of the other film bodies 10 are arranged side by side along one other direction C in the surface direction (horizontal direction) of the other film bodies 10 and are adjacent to each other in the other one direction C. The opposing edge portions 13 and 13 of the two band-shaped film materials 12 and 12 are overlapped and heat-welded W1. That is, the cross-sectional shapes of the group of film-like film members 12 of the film body 8 and the other film bodies 10 are the same shape and size.

  In the illustrated example, the one direction A and the other one direction C are the same direction, and in a plan view, each band-shaped film material 12 of the film body 8 and each band-shaped film material 12 of the other film body 10 Are located at the same place. The one direction A and the other direction C may be different from each other, for example, orthogonal to each other in plan view. The width dimensions of the band-shaped film material 12 of the film body 8 and the band-shaped film material 12 of the other film body 10 may be different from each other. Further, the other film body 9 positioned between the film body 8 and the other film body 10 has the same configuration and the same size as the other film body 10 although not shown in detail. The other film bodies 9 and 10 may be simple flat film bodies without the thermal welding W1.

  The edge side 17b is turned up with respect to the base side 17a which comprises the outer edge part 17 of these strip | belt-shaped film | membrane materials 12 in the longitudinal direction B of each said strip | belt-shaped film | membrane material 12, The base side 17a and the edge side 17b mutually heat-weld W2. Is done. In this case, a flexible rope 19 is inserted into the inside of the valley bent portion between the base side 17a and the edge side 17b.

  More specifically, the outer edge portion 20 of the film body 8 having the base side 17a and the edge side 17b, and the outer edge portions 21 and 22 of the other film bodies 9 and 10 corresponding to the outer edge portion 20 Are overlapped with each other in a surface contact manner, and the outer edge portions 20, 21, and 22 are heat-welded W2 to each other. In this case, the outer edge portions 21 and 22 of the film bodies 9 and 10 are respectively inserted between the base side 17a and the end edge side 17b of the outer edge portion 20 of the film body 8, and the outer edge portions 21 and 22 are inserted. Is sandwiched between the base side 17a and the edge side 17b.

  As described above, the outer edge portions 20, 21, and 22 of the film bodies 8, 9, and 10 are coupled to each other by the thermal welding W <b> 2 and sandwiched by the coupling tool 4, and are attached to the coupling tool 4. The rope 19 is locked via the outer edge 20 of the film body 8 and fixed to the beam 3 of the structure 1.

  The space 24 between the film bodies 8, 9, 10 is substantially sealed by the thermal welding W <b> 2 of the outer edge portions 20, 21, 22 of the film bodies 8, 9, 10. Gas is sealed in the space 24 and the space 24 and the film bodies 8, 9, 10 are expanded, whereby tension is applied to the film bodies 8, 9, 10. Then, by applying this tension, the film bodies 8, 9, and 10 are held in a desired shape so as to form the roof and ceiling of the structure 1. The desired gas is encapsulated in accordance with applications such as air, nitrogen, and helium.

  In addition, as the multi-layered film structure 5, it is not necessary to provide another film body 9 located in the middle of the film bodies 8, 9, and 10, and each film body 8, 9, Another film body may be added to 10. Further, among the film bodies 8, 9, and 10, the other film bodies 9 and 10 may not be provided. In this case, the film body 8 is used alone as, for example, a greenhouse for a farm or a tent. Used for walls, roofs, and ceilings.

  As long as the space 24 is prevented from communicating with the outside, an opening 26 which is a notch is formed in a portion where the end edge side 17b overlaps the opposing edge portions 13 and 13 on the base side 17a. . The opening 26 may be a circular, long hole, or rectangular through hole. Further, another opening 27 which is a notch is formed in a portion where the outer edge portion 21 of the other film body 9 adjacent to the film body 8 overlaps the opposite edge portions 13 and 13 on the base side 17a. Yes. A part of the other opening 27 communicates the two divided spaces of the space 24 divided by the other film body 9 with each other. The other opening 27 may be a circular through-hole, but the other opening 27 may not be provided.

  According to the said structure, it has the strip | belt-shaped film | membrane material 12 arranged in parallel along the one direction A, and both the opposing edge parts 13 of the both strip | belt-shaped film | membrane materials 12 and 12 adjacent to each other in the said one direction A, 13 are overlapped and these opposite edge portions 13 and 13 are heat-welded W1 to each other, and end with respect to the base side 17a constituting the outer edge portion 17 of the band-like film material 12 group in the longitudinal direction B of each band-like film material 12 The edge side 17b is folded back, and the base side 17a and the edge side 17b are heat-welded W2 to each other.

  That is, the strength of the outer edge portion 20 of the film body 8 is obtained by folding the end edge side 17b with respect to the base side 17a constituting the outer edge portion 17 of the band-like film material 12 group included in the film body 8 and performing thermal welding W2. Has been improved.

  And the opening 26 is formed in the part which the said edge side 17b overlaps with the said opposing edge parts 13 and 13 in the said base side 17a.

  For this reason, as described above, even when the strength of the outer edge portion 20 of the film body 8 is improved, the end portions are opposed to the film materials of the opposite edge portions 13 and 13 that are overlapped with each other on the base side 17a. It is prevented by the formation of the opening 26 described above that the film material which is a part of the edge side 17b is further overlapped by the folding of the edge side 17b. That is, even if the end edge 17b is folded back, the formation of multiple welds is suppressed.

  Here, as described in the prior art, if the above-described multiple welded portion is formed, the strength at the transition portion from the multiple welded portion to the non-welded portion adjacent thereto is increased. It tends to change suddenly, and there is a possibility that the strength of a part of the multiple welded portion is lowered due to repeated thermal welding at the same location in the multiple welded portion. In this case, stress concentration is likely to occur in a part of the transition part and the multiple weld part, and there is a possibility that the part is likely to be damaged. However, according to the above configuration, the formation of multiple welds is suppressed as described above, and therefore damage based on the stress concentration is prevented in advance. Therefore, the lifetime of the film body 8 is improved.

  Further, as described above, the other film bodies 9 and 10 are provided to overlap the film body 8, and the outer edge portion 20 of the film body 8 having the base side 17a and the edge side 17b and the other film body 9 are provided. , 10 are overlapped with each other, and the respective outer edge portions 20, 21, 22 are heat-welded W2 to each other.

  Here, when forming the multilayer structure 5, the outer edges 20, 21, and 22 of the film body 8 and the other film bodies 9 and 10 are overlapped with each other, and the outer edges 20, 21, and 22 are heated with each other. In the case of welding W2, the possibility of forming the multiple welded portion becomes higher. However, according to the above configuration, the formation of the multiple welds is suppressed by forming the openings 26 and 27. Therefore, the lifetime of each of the film bodies 8, 9, 10 is improved, that is, the lifetime of the multilayer structure 5 is improved.

  Moreover, as described above, the other film body 10 has the strip-shaped film material 12 arranged in parallel along the other one direction C in the surface direction, and is adjacent to each other in the other one direction C. The opposing edge portions 13 and 13 of the matching band-shaped film materials 12 and 12 are overlapped and heat-welded W1, and a gas is sealed in a space 24 between the film body 8 and the other film body 10. .

  Here, as described above, the film body 8 and the other film bodies 10 are inflated by enclosing the gas 24 in the space 24 between these 8 and 10 and expanding them. Is granted. In this case, since the other film body 10 has substantially the same configuration as the film body 8 as described above, tension is applied to the film bodies 8 and 10 in a balanced manner. Then, by applying such tension, the multi-layer structure 5 composed of these film bodies 8 and 10 can be held in a desired shape such as the roof, ceiling, and wall of the structure 1.

  As described above, the outer edge portions 21 and 22 of the other film bodies 9 and 10 are inserted between the base side 17a and the end edge side 17b of the outer edge portion 20 of the film body 8.

  For this reason, the outer edge portions 21 and 22 of the other film bodies 9 and 10 are sandwiched between the base side 17a and the end edge side 17b of the outer edge portion 20 of the film body 8 which is an integral body. The mutual bonding strength of the outer edge portions 20, 21, 22 of the bodies 8, 9, 10 is improved. Accordingly, the life of each film body 8, 9, 10 is improved correspondingly, that is, the life of the multilayer structure 5 is improved.

  In addition, although the above is based on the example of illustration, by extending each film body 8,9,10 of the multilayer film structure 5 in the vertical direction or the inclined direction, the multilayer film structure 5 has the roof, ceiling, and You may make it comprise a wall.

  FIG. 6 below shows the second embodiment. The second embodiment is common in many respects to the configuration and operational effects of the first embodiment. Therefore, regarding these common items, common reference numerals are attached to the drawings, and redundant description thereof is omitted, and different points are mainly described. In addition, the configuration of each part in these embodiments may be variously combined in light of the object and operational effects of the present invention.

  In order to describe the present invention in more detail, Example 2 will be described with reference to FIG.

  In FIG. 6, the opening 26 is not formed on the edge side 17b. On the other hand, an opening 27 is formed in a portion where the outer edge portion 21 of the other film body 9 adjacent to the lower side of the film body 8 overlaps the heat welding W1 portion of the opposing edge portions 13 and 13 on the base side 17a. Has been. In addition, as shown with the dashed-dotted line in FIG. 6, another opening is carried out in the part which the outer edge part 22 of the said other film body 10 overlaps with the heat welding W1 part of the said opposing edge parts 13 and 13 in the said base part side 17a. 28 may be formed.

  According to the above configuration, in the multi-layer structure 5 provided with the film body 8 and a plurality of other film bodies 9 and 10 that are stacked on each other, the outer edge portion 17 of the group of strip-shaped film materials 12 included in the film body 8 is provided. The strength of the outer edge portions 20, 21, and 22 of the multilayer structure 5 is improved by folding the end edge side 17 b with respect to the base portion 17 a to be formed and performing heat welding W <b> 2.

  An opening 27 is formed at a portion where the outer edge portion 21 of the other film body 9 adjacent to the film body 8 overlaps the opposing edge portions 13 and 13 on the base side 17a.

  Therefore, as described above, even when the strength of the outer edge portions 20, 21, and 22 of the multilayer structure 5 is improved, both films of the opposing edge portions 13 and 13 that are overlapped with each other on the base side 17a. It is prevented by the formation of the opening 27 described above that the film materials of the end edge side 17b and the outer edge portions 21 and 22 of the other film bodies 9 and 10 are further overlapped on the material. That is, even if the outer edge portions 21 and 22 of the other film bodies 9 and 10 are overlapped in addition to the folding of the edge side 17b of the group 12 of film-like film materials, the formation of multiple welds is suppressed.

  Here, as described in the prior art, if the above-described multiple welded portion is formed, the strength at the transition portion from the multiple welded portion to the non-welded portion adjacent thereto is increased. It tends to change suddenly, and there is a possibility that the strength of a part of the multiple welded portion is lowered due to repeated thermal welding at the same location in the multiple welded portion. In this case, stress concentration is likely to occur in a part of the transition part and the multiple weld part, and there is a possibility that the part is likely to be damaged. However, according to the above configuration, the formation of multiple welds is suppressed as described above, and therefore damage based on the stress concentration is prevented in advance. Therefore, the lifetime of each of the film bodies 8, 9, 10 is improved, that is, the lifetime of the multilayer structure 5 is improved.

DESCRIPTION OF SYMBOLS 5 Multi-layer structure 8 Film body 9 Film body 10 Film body 12 Strip | belt-shaped film | membrane material 13 Opposing edge part 17 Outer edge part 17a Base part side 17b End edge side 20 Outer edge part 21 Outer edge part 22 Outer edge part 24 Space 26 Opening 27 Opening 28 Opening A One Direction B Longitudinal direction C Other direction W1 Thermal welding W2 Thermal welding

Claims (5)

A plurality of strip-shaped film materials arranged side by side along one direction, and the opposing edge portions of the two strip-shaped film materials adjacent to each other in the one direction are overlapped, and these opposing edge portions are thermally welded to each other. In the film body in which the edge side is folded back with respect to the base side constituting the outer edge part of the band-shaped film material group in the longitudinal direction of each of the band-shaped film materials, and the base side and the edge side are thermally welded to each other,
A film body, wherein an opening is formed in a portion where the end edge side overlaps the opposite edge portions on the base side.   The film body of claim 1 is provided with another film body, and the outer edge portion of the film body having the base side and the edge side is overlapped with the outer edge portion of the other film body, and each of these outer edge portions is overlapped. Is a multilayer film structure characterized by being thermally welded to each other.   The other film body has a strip-shaped film material arranged in parallel along one other direction in the surface direction, and the two film-shaped film materials adjacent to each other in the other one direction are opposed to each other. The multi-membrane structure according to claim 2, wherein the edges are overlapped and thermally welded, and gas is sealed in a space between the film body and another film body. A film body and a plurality of other film bodies that are stacked on each other are provided, and the film body includes a strip-shaped film material that is juxtaposed along one direction in the surface direction, and is mutually in the one direction. The base side which forms the outer edge part of these strip | belt-shaped film material groups in the longitudinal direction of each said strip | belt-shaped film | membrane material in which both the mutually opposing edge parts of adjacent strip | belt-shaped film | membrane materials are piled up, and both these strip | belt-shaped film | membrane materials are heat-welded mutually. The outer peripheral side of the film body having the base side and the end side is overlapped with the outer edge part of each of the other film bodies, and the outer peripheral parts are heat-welded to each other. In the structure,
An opening is formed in a portion where an outer edge portion of another film body adjacent to the film body overlaps with the opposite edge portions on the base side.   5. The multiplex according to claim 2, wherein the outer edge portion of the other film body is inserted between the base side and the edge side of the outer edge portion of the film body. Membrane structure.

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