Manufacturing method of shutter curtain in sheet style shutter unit

Abstract

To make a sheet style shutter curtain 2, which opens and closes an opening of an entrance and the like of a building, efficiently have first and second thermal-insulation space parts X and Y joined forward-after and upper-lower alternately by using first, second and third sheet materials 7, 8 and 9 with heat fusion.SOLUTION: Upon a second thermal-insulation space part being formed by heat-fusing second and third sheet materials 8 and 9, and when a first thermal-insulation space part X is formed by heat-fusing a first sheet material 7 to the second sheet material 8 to which the third sheet material has been joined, a non-thermal-fusing material 15 is placed between the second and third material 8 and 9 so that the third sheet material 9 will not be heat-fused to the second sheet material 8.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to the technical field of a manufacturing method for a shutter curtain in a sheet-type shutter device that can be installed so as to be freely opened and closed at an opening such as an entrance or exit of a building. [Background technology]

[0002] Generally, among the shutter devices installed to open and close openings such as entrances and exits of buildings, there is known a type in which the shutter curtain is made of a sheet and wound around a winding body (winding drum, winding wheel) installed in the ceiling (above the opening) in order to speed up the opening and closing operation of the shutter curtain. In such sheet-type shutter devices, the shutter curtain is made of a single sheet material, which impairs the insulation (heat retention) properties and reduces the air conditioning effect. It has been proposed to create a shutter curtain by connecting a pair of front and back sheet materials together with a vertical gap using an appropriate connecting means such as gluing or sewing, so that multiple cylindrical insulating space sections are arranged in a vertical series via the connecting sections (see, for example, Patent Documents 1 and 2). However, in all of the above-mentioned conventional devices, the insulating space sections that are connected vertically are simply connected via connecting parts, so while the insulating space sections can exhibit insulating performance, there is a problem that the insulating performance is impaired in the connecting parts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 58-141090 [Patent Document 2] Utility Model Registration No. 2601831 Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, it is proposed to improve the poor insulation performance of the conventional connection part by forming a second insulation space between the upper and lower first insulation spaces (first insulation spaces) with a connection part sandwiched between them.In this case, it is proposed to adopt a connection means by thermal fusion to connect the sheet materials, rather than a connection means such as adhesion or sewing, so that the sheet materials can be strongly integrated, and the shutter curtain can be made highly reliable by exhibiting a stable connection function over the long term and being resistant to changes over time. However, in the procedure for forming a shutter curtain having first and second insulating spaces using this type of connecting means by heat fusion, for example, when a first and second sheet material are heat fused to form a first insulating space, and then a third sheet material is attached to the upper and lower second sheet materials and the second and third sheet materials are heat fused to form a second insulating space, problems arise in that the first sheet material, which must not be fused, is present in a layered manner at the fusion site, making the fusion work difficult and reducing workability, and these are the issues that the present invention aims to solve. [Means for solving the problem]

[0005] The present invention has been made in view of the above-mentioned circumstances and with the objective of solving these problems. The invention of claim 1 relates to a sheet-type shutter curtain that is installed to open and close an opening such as an entrance to a building, in which a first cylindrical insulation space is formed continuously from top to bottom across the first connecting part by connecting first and second sheet materials together at an appropriate interval, and a third sheet material is connected to the second sheet materials at the top and bottom of the first insulation space portions across the first connecting part via the second connecting part, in a state in which the third sheet material straddles the first connecting part, so that a second cylindrical insulation space is formed continuously from top to bottom across the first connecting part, and the first, second and third sheet materials are heat-sealable, and the first and second connecting parts a first heat-sealing step of heat-sealing and connecting the second sheet material to either the first or third sheet material, and a second heat-sealing step of heat-sealing and connecting the second sheet material to the other of the first and third sheet materials, the second heat-sealing step being performed in a state in which a non-heat-sealing material made of a material that is not heat-sealable and has heat resistance is sandwiched between the second sheet material at a portion heat-sealed by the second heat-sealing step and the other sheet material that is not heat-sealed to the second sheet material, It is. The invention of claim 2 is a manufacturing method for a shutter curtain in a sheet-type shutter device described in claim 1, characterized in that the first heat sealing process is a process of heat sealing the second sheet material and the third sheet material to form a second insulating space portion, and the second heat sealing process is a process of heat sealing the second sheet material and the first sheet material to form a first insulating space portion. The invention of claim 3 is a manufacturing method for a shutter curtain in a sheet-type shutter device described in claim 2, characterized in that the second sheet material has an extended lower piece portion extended to form a bottom portion which is the lowest end of the shutter curtain, and a folded piece portion formed by folding back an extension from the extended lower piece portion, and the bottom portion is formed by connecting the tip of the folded piece portion to the extended lower piece portion by heat sealing, and a bottom portion sealing process for forming the bottom portion is performed either before or after the second heat sealing process. The invention of claim 4 is a method for manufacturing a shutter curtain in a sheet-type shutter device described in claim 2, characterized in that the first and second sheet materials are connected in a folded manner at the bottom portion which is the lowest end of the shutter curtain, and after a first heat sealing process is performed in which the second sheet material and the third sheet material are heat sealed together, a first sheet material folding process is performed in which the first sheet material connected to the second sheet material is folded back at the bottom portion to face the second sheet material, and then a second heat sealing process is performed in which the first sheet material and the second sheet material are heat sealed together. The invention of claim 5 is a method for manufacturing a shutter curtain in a sheet-type shutter device described in claim 2, characterized in that the non-thermal adhesive material is attached to a portion corresponding to the first connecting portion of the second or third sheet material at a stage before the first heat sealing process is performed, thereby clamping the non-thermal adhesive material. The invention of claim 6 is a manufacturing method for a shutter curtain in a sheet-type shutter device described in claim 1, characterized in that the first heat sealing process is a process of heat sealing a first sheet material and a second sheet material to form a first insulating space portion, and the second heat sealing process is a process of heat sealing a second sheet material and a third sheet material to form a second insulating space portion. The invention of claim 7 is a method for manufacturing a shutter curtain in a sheet-type shutter device described in claim 6, characterized in that the non-thermal adhesive material is attached to a portion corresponding to the second connecting portion of the first or second sheet material at a stage before the first thermal adhesive process is performed, thereby clamping the non-thermal adhesive material. The invention of claim 8 is a manufacturing method for a shutter curtain in a sheet-type shutter device according to claim 5 or 7, characterized in that the non-thermal adhesive material is removed after the second fusion step is carried out. Effect of the Invention

[0006] By making use of the invention of claim 1, a sheet-type shutter curtain can be made which comprises first, second and third sheet materials, which are heat-sealed by the first and second heat-sealing processes to form first and second connecting portions, thereby making it possible to make a highly insulating shutter curtain in which the first and second insulating spaces are connected up and down in a state in which they are alternately stacked front to back. However, in the second heat-sealing process, heat-sealing is performed in a state in which a non-heat-sealable material is sandwiched between the second sheet material and the other sheet material which is not heat-sealed. As a result, while the second heat-sealing process is performed in a state in which the first, second and third sheet materials are stacked, only the second sheet material and the other sheet material are heat-sealed, and the one sheet material which was heat-sealed earlier is not heat-sealed, and the insulating space formed in the first heat-sealing process is maintained as it is, thereby easily and reliably forming the same. According to the invention as defined in claim 2, the first and second heat fusion steps for forming the first and second heat insulating spaces can be carried out efficiently. By adopting the invention of claim 3, when the second sheet material constituting the sheet-type shutter curtain has its lower edge folded back and heat-sealed to form a bottom portion, the heat-sealing process for forming the bottom portion can be carried out either before or after the second heat-sealing process, so that the formation of the bottom portion can be carried out efficiently. By adopting the invention of claim 4, when the first and second sheet materials for constituting the shutter curtain are formed from a continuous long sheet material that is folded over at the bottom portion, after a first heat sealing step of heat sealing the second and third sheet materials is performed, the second sheet material is folded over to make the first sheet material face the second sheet material, and then a second heat sealing step of heat sealing the first and second sheet materials is performed, resulting in an efficient heat sealing step. By adopting the invention of claim 5, a non-thermal-sealable material can be sandwiched between the second sheet material and the third sheet material, which are not thermally sealed in the second heat sealing process, by attaching it to the second or third sheet material at a stage prior to the first heat sealing process, thereby improving workability. By adopting the invention of claim 6, the first heat sealing process is a process of heat sealing the first sheet material and the second sheet material to form a first insulating space portion, and the second heat sealing process is a process of heat sealing the second sheet material and the third sheet material to form a second insulating space portion, thereby ensuring efficient heat sealing. By adopting the invention of claim 7, the non-thermal-sealing material can be easily clamped by attaching it to a portion of the first or second sheet material corresponding to the second connecting portion at a stage before the first thermal sealing process is performed. According to the invention as defined in claim 8, the non-thermal adhesive material can be removed after the second fusion step is performed, making it possible to reuse the material, thereby promoting the effective use of the material. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2] FIG. 2 is a vertical sectional side view of the shutter device. [Diagram 3] FIG. [Figure 4] 13(A) and 13(B) are longitudinal cross-sectional views of the upper and lower ends of a shutter curtain. [Diagram 5] 1A and 1B are enlarged front views of the main parts of the left and right edge portions of the shutter curtain, and cross-sectional plan views of the guide rail portion. [Figure 6] 1A and 1B are a perspective view and a side view showing an outline of a thermal fusion device. [Figure 7] 1(A) and 1(B) are schematic side views showing the first and second fusion steps. [Figure 8] 1A, 1B, and 1C are front views of the essential parts of the shutter curtain with the insulating space sealed, front views of the essential parts with the end sheet material attached, and longitudinal plan views of the essential parts with the end sheet material attached. [Figure 9] 5(A) to 5(C) are schematic perspective views of the main part, illustrating a procedure for forming the bottom portion. [Figure 10]13A and 13B are schematic perspective views of essential parts showing a procedure for connecting an end sheet material to a bottom portion. [Figure 11] 13(A) and 13(B) are schematic perspective views of essential parts showing a procedure for connecting bottom sheet materials. [Figure 12] 1A, 1B, and 1C are a front view, a cross-sectional side view along line BB, and a cross-sectional side view along line CC of the window portion of the shutter curtain. [Figure 13] FIG. [Figure 14] 11 shows a second embodiment, in which (A) and (B) are schematic side views showing the first and second fusion steps. [Figure 15] 13 shows a third embodiment, in which (A), (B), and (C) are schematic side views showing a first fusion step, a folding step, and a second fusion step. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a sheet-type shutter device that is installed to separate an opening E, such as an entrance or exit of a building, such as a building or a factory, into front and rear (indoor and outdoor), and the shutter device 1 is of a general-purpose structure that is configured using various member devices, such as a sheet-type shutter curtain 2 (described later), guide rails 3 that are provided on the left and right sides of the opening E to guide the shutter curtain 2 in opening and closing up and down, a take-up body (take-up drum, take-up wheel) 5 that is disposed in a shutter case 4 provided above the opening E and on which the shutter curtain 2 is wound in a spiral shape, and an electric opening / closing device 6 that is provided to rotate the take-up body 5 forward and backward, all of which are conventional.

[0009] The shutter curtain 2 has its upper edge connected to a roll-up body 5 so as to separate the opening E into front and rear (indoors and outdoors) when in a closed (fully closed) position, and is composed of a first sheet material 7 which is long in the vertical direction, a second sheet material 8 which is long in the vertical direction and arranged opposite the first sheet material 7, a third sheet material 9 which is arranged opposite the second sheet material 8, and end sheet materials 10 which are connected to both the left and right end edges of these sheet materials 7, 8, 9 and are inserted into the guide rails 3 to be guided for opening and closing, and furthermore, a bottom portion (seat portion) 11 is formed at the lower edge of the shutter curtain 2 into which a weight 11a is enclosed to assist the closing operation of the shutter curtain 2.

[0010] Incidentally, in this embodiment, a brief explanation will be given of the structure in which the end sheet material 10 provided on both the left and right end edges of the shutter curtain 2 is guided for opening and closing by the guide rail 3, but this configuration already employs publicly known technology. First, the guide rail 3 is formed in a C-shaped guide groove and is made of a flexible material. The guide rail 3 thus formed is provided on a rail body 3a provided on the body side member Z so as to be movable in the left-right direction while being biased outward in the left-right direction via a resilient device 3b. The left-right outer piece of the end sheet material 10 is inserted into the guide rail 3, and a guide protrusion 10b is provided at the insertion portion of the end sheet material 10, and the guide protrusion 10b fits into the guide rail 3 having a guide groove shape, thereby preventing the end sheet material 10 from easily slipping out. In this state, if a person or luggage hits the shutter curtain 2 in the closed position, the contact load will cause the guide rail 3 to move in the direction of coming out of the rail main body 3a (inward in the left-right direction) against the biasing force of the elastic mechanism 3b, thereby reducing the contact load.However, if the contact load is large, the guide rail 3 that has come out of the rail main body 3a against the biasing force of the elastic mechanism 3b will expand, and the guide protrusion 10b will come out of the guide rail 3, causing the shutter curtain 2 to come out of the guide rail 3, thereby preventing damage to the shutter curtain 2 and the abutting object. Incidentally, the guide projections 10b are attached to reinforcing portions 10c which are formed by folding back the left and right edge portions of the end sheet material 10 to form a double layer and then further reinforcing the double layer by heat sealing.

[0011] Next, the structure of the shutter curtain 2 will be specifically described. In the shutter curtain 2, the first and second sheet materials 7, 8 are connected vertically at an appropriate interval to each other, so that a first insulating space X having a cylindrical shape with both left and right ends open is formed continuously from top to bottom with a first connecting portion 21 sandwiched therebetween. A third sheet material 9 is attached to the second sheet materials 8 at the upper and lower first insulating space X parts sandwiching the first connecting portion 21 and connected to form a second connecting portion 22, so that a second insulating space Y having a cylindrical shape with both left and right ends open is formed continuously from top to bottom with a state of straddling the first connecting portion 21. Then, the first and second insulating materials 12, 13 are inserted and assembled in the first and second insulating spaces X, Y in a loose fit state. When the shutter curtain 2, in which the first and second insulating materials 12, 13 are incorporated in the first and second insulating space portions X, Y, is in a tensed closed (hanging) position under the weight of the bottom portion 11, the second insulating material 13 is arranged so that it overlaps (stacks) from the front to the back at the first connecting portion 21. In this state, the upper and lower edge portions of the first and second insulating materials 12, 13 overlap from the front to the back, and the shutter curtain 2 is configured so that the first and second insulating materials 12, 13 are arranged alternately from the front to the back, but are continuous with no gaps above and below, thereby allowing the shutter curtain 2 to exhibit high insulating performance. In this case, the shutter curtain 2 is configured such that the upper edge of the second sheet material 8, which is sandwiched between the first and third sheet materials 7 and 9, is connected to the roll-up body 5, and a bottom portion 11 is formed in a folded-over shape at the lower end, i.e., the second sheet material 8 is configured as a core material that serves as the curtain core of the shutter curtain 2.

[0012] The procedure for manufacturing such a shutter curtain 2 will be described below. In this case, the first, second and third sheet materials 7, 8, 9, the end sheet material 10 and the bottom sheet material 16 described later all have heat fusion properties, and all of these are connected by heat fusion, which is easier to work with than when sewing or bonding is used as the connecting means. Specifically, these sheet materials 7, 8, 9, 10, and 16 are all made of a heat-resistant resin material, for example a sheet material (woven fabric, nonwoven fabric) formed by braiding polyester resin fibers as a core material, and a flexible cloth material (drawing cloth) formed by bonding (integrating) a resin material having heat fusion properties, for example a polyvinyl chloride resin material, to the surface of the core material in a molten state.

[0013] For example, a well-known high-frequency dielectric type heat-sealing device 14 is used for heat-sealing such sheet materials 7, 8, 9, 10, 16. The heat-sealing device 14 will be briefly described with reference to FIG. 6. For example, in the case of a device in which the first and second sheet materials 7, 8 are heat-sealed first as in a second embodiment described later, the device is provided with a flat electrode substrate 14a serving as a negative pole and a rod-shaped electrode body 14b serving as a positive pole. With the first and second sheet materials 7, 8 overlapped, the second sheet material 8 is set on the substrate 14a so that it abuts against the electrode substrate 14a. At the same time, with the electrode body 14b set so as to be pressed against the first sheet material 7, a high-frequency current is applied between the two electrodes, causing the first and second sheet materials 7, 8 to heat up and melt (dissolve) at the portions thereof that are in contact with the electrode body 14b, thereby bonding (connecting) them together; this fusion (welding) forms a first connecting portion 21, and the first and second sheet materials 7, 8 are connected together as an integrated unit; the heat fusion process described below is carried out using such a heat fusion device 14.

[0014] The shutter curtain 2 is manufactured by first appropriately heat-sealing the first, second and third sheet materials 7, 8 and 9 to form the first and second connecting portions 21 and 22, thereby forming the first and second insulating space portions X and Y. The manufacturing method thereof will now be described. In this case, in this embodiment, as shown in Figure 7, the first heat sealing process is performed in which the second and third sheet materials 8, 9 are heat sealed to form a second connecting portion 22 to form a second insulating space portion Y, and then the second heat sealing process is performed in which the first and second sheet materials 7, 8 are heat sealed to form a first connecting portion 21 to form a first insulating space portion X.

[0015] In this case, the second sheet material 8 is configured as a single piece with its upper end connected to the roll 5 and its lower end set to a length that folds back to form the bottom portion 11, whereas the first sheet material 7 is configured as a single piece set to a length that forms the space between the upper and lowermost first connecting portions 21, but the third sheet material 9 is configured as a plurality of single pieces set to a length (vertical width) between the upper and lower second connecting portions 22 to form each second insulation space portion Y. For this reason, the connection of the third sheet material 9 to the second sheet material 8 by thermal fusion results in the third sheet material 9 being connected above and below the second sheet material 8 in one first insulation space portion X portion, resulting in a connection structure in which the second connecting portions 22 are formed in two places, above and below. Incidentally, the third sheet material 9 can also be configured as a single piece set to a length that forms the space between the second connecting portions 22 at the upper and lower ends, similar to the first sheet material 7. In this case, the third sheet material 9 can be connected to the second sheet material 8 at one first insulation space portion X with a single connecting structure.

[0016] In this case, a first heat sealing step is performed in which a third sheet material 9 is applied to a portion of the second sheet material 8 corresponding to the second insulating space Y, and the second and third sheet materials 8, 9 are heat-sealed together to form a second connecting portion 22, thereby forming a cylindrical second insulating space Y that is open on both sides. Next, a second heat sealing step is performed in which a first sheet material 7 is applied to the surface of the second sheet material 8 opposite to the surface to which the third sheet material 9 is connected, and the first and second sheet materials 7, 8 are heat-sealed together to form a first connecting portion 21, thereby forming a cylindrical first insulating space X that is open on both sides.

[0017] In this case, in the second heat-sealing step, if the first, second and third sheet materials 7, 8 and 9 are laminated and heat-sealed in this state, not only will the first and second sheet materials 7 and 8 to be heat-sealed be heat-sealed, but the third sheet material 9 will also be heat-sealed to the second sheet material. To avoid this, a sheet-like non-heat-sealing material 15 is attached in advance to the surface of the third sheet material 9 facing the second sheet material 8, corresponding to the location of the first connecting portion 21, via a fastening material such as a double-sided adhesive sheet, at a stage before the first heat-sealing step is performed, and the third sheet material 9 with the non-heat-sealing material 15 provided is used. The non-thermal adhesive material 15 is made of a material having excellent heat resistance, such as silicone resin or fluororesin, to which the thermal adhesive resin used in each of the sheet materials 7, 8, and 9 will not thermally fuse.

[0018] Then, after the first heat-sealing step is performed using the third sheet material 9 provided with the non-thermal adhesive material 15 in this manner, a second heat-sealing step is performed in which the second sheet material 8 and the first sheet material 7 are heat-sealed to form the first connecting portion 21. When this second heat-sealing step is performed, the first, second and third sheet materials 7, 8 and 9 are laminated at the first connecting portion 21 by the heat-sealing device 14, and a high-frequency current is applied to perform heat fusion, but as described above, the non-thermal adhesive material 15 is fixed to the third sheet material 9. As a result, the non-thermal adhesive material 15 is sandwiched between the second and third sheet materials 8 and 9, and in the second heat-sealing step, the first and second sheet materials 7 and 8 are heat-sealed to each other to form the first connecting portion 21, while the third sheet material 9 and the second sheet material 8 are not heat-sealed to each other, and the cavity of the second insulating space portion Y is maintained.

[0019] After the second heat sealing process is carried out, the non-heat-sealing material 15 can be peeled off and removed from the third sheet material 9, thereby making the second insulating space Y free of the non-heat-sealing material 15. However, if the non-heat-sealing material 15 is thin and will not cause any problems if it remains when the shutter curtain 2 is made, it is not necessarily necessary to remove it. Incidentally, in this case, the non-thermal adhesive material 15 is provided on the third sheet material 9 because the third sheet material 9 and the second sheet material 8 are not thermally fused in the second heat sealing process, but it is of course also possible to implement the process in which the non-thermal adhesive material 15 is provided on the second sheet material 8 side rather than the third sheet material 9.

[0020] Furthermore, as described above, a bottom portion 11 is formed at the lowest end of the shutter curtain 2. As shown in FIG. 9, the bottom portion 11 comprises an extended lower piece 8a extending downward from the first insulation space portion X at the lowest end of the second sheet material 8, and a folded piece 8b extending further from the extended lower piece 8a and folded back toward the first sheet 7. A fourth connecting portion 24 is formed by heat-sealing the tip (upper end) of the folded piece 8b to the upper end of the extended lower piece 8a, so that the upper end of the folded piece 8b is formed into a tubular shape connected by the fourth connecting portion 24. Since the fourth connecting portion 24 is formed on the first sheet material 7 side, it is preferable from the standpoint of workability to perform the formation of this bottom portion 11 either before or after the second heat-sealing process in which the first and second sheet materials 7, 8 are heat-sealed.

[0021] After the first and second insulating materials 12, 13 are inserted and assembled into the hollow first and second insulating spaces X, Y constructed in this manner, the left and right end edges of the first and second insulating spaces X, Y are sealed via the third connecting portions 23 formed by the third heat sealing process, thereby making the first and second insulating spaces X, Y sealed and airtight with the first and second insulating materials 12, 13 inserted, thereby improving the insulation properties (see Figure 8). In this case, both left and right edge portions of the bottom portion 11 have cutout portions 8c formed by cutting out both left and right edge portions of the folded-over piece portion 8b, so that the third connecting portion 23 formed by the third heat fusion process is not formed in the bottom portion 11 (see Figure 9).As a result, both left and right edge portions of the bottom portion 11 remain open, and the weight 11a can be inserted and assembled as desired.

[0022] In this way, with the third connecting portion 23 formed for sealing both left and right edge portions of the first and second insulating space portions X, Y, as shown in Figures 8 and 10, the left and right inner portion of the end sheet material 10 is further laminated on the surface of the second sheet material 8 side of the third connecting portion 23 to form a fifth connecting portion 25 by thermal fusion, thereby connecting the end sheet material 10 to both left and right ends of the shutter curtain 2. In this case, the end sheet material 10 is long and has an end extension 10a formed that reaches the bottom portion 11, and the end extension 10a is heat-sealed to both left and right edge portions of the extended lower piece 8a that constitutes the bottom portion 11 as the fifth connecting portion 25. In this connected state, the bottom portion 11 has a cutout portion 8c formed in the folded piece 8b, so that even when connected by the fifth connecting portion 25, both left and right edge portions are not sealed and remain open. In this embodiment, the heat fusion process of the third connecting portion 23 for sealing both the left and right end edges of the first and second insulating space portions X and Y and the fifth connecting portion 25 for heat-sealing the end sheet material 10 to the third connecting portion 23 is described as being performed as separate processes, but since the heat fusion is performed at the same location, the heat fusion processes for forming the third connecting portion 23 and the fifth connecting portion 25 can also be performed simultaneously depending on the settings.

[0023] The bottom portion 11 constructed in this manner is further covered around its outer periphery by a loosely fitted bottom sheet material 16 as shown in Figure 11. The bottom end of the bottom sheet material 16 is folded back into a bag shape, and the upper edge portions 16a of the front and rear sheet pieces are laminated to the fourth connecting portion 24 and are further connected by a sixth connecting portion 26 formed by heat fusion. In this case, since the sixth connecting portion 26 is also formed in a state where it is laminated to the fourth connecting portion 24, it goes without saying that the heat fusion process for forming the fourth connecting portion 24 and the sixth connecting portion 26 may be carried out simultaneously.

[0024] Furthermore, the shutter curtain 2 of this embodiment is provided with a window portion W, allowing one to see inside and outside, and this window portion W is made by attaching a window sheet material 17 by thermal fusion, as will be described in detail below. The window sheet material 17 is made of a transparent, heat-sealable resin material, such as a sheet material made of polyvinyl chloride, and at the portion of the shutter curtain 2 where the window sheet material 17 is attached, as shown in Figure 12, the first sheet material 7 is cut at the first connecting portion 21, but the second sheet material 8 is cut in a state where a window extension piece portion 8d is present, extending vertically inward (towards the window portion W) beyond the first connecting portion 21. The seventh connecting portion 27 is formed by heat-sealing both the upper and lower end edges of the window sheet material 17 to the window extension piece 8d of the second sheet material 8. In this case, cut-out portions 17a are formed in the upper, lower, left and right corner portions of the window sheet material 17. As a result, the seventh connecting portion 27 is made into a single piece in which only the second sheet material 8 is present in the area corresponding to the cut-out portion 17a, and there is no window sheet material 17.

[0025] The shutter curtain 2 is thus formed by connecting the window sheet material 17 to the vertical middle portion. In this case, the fifth connecting portion 25 is formed at both left and right end edge portions of the window sheet material 17 by welding the end sheet material 10 to the surface of the window sheet material 17 on the second sheet material 8 side, but the fusion for forming the fifth connecting portion 25 at the window portion W portion is performed by forming a notch portion 17a at the corner portion of the window sheet material 17, so that at the outer corner portion, two sheets of the second sheet material 8 and the end sheet material 10 are fused together, and the thicknesses of the left and right fifth connecting portions 25 and the upper and lower seventh connecting portions 27, which form the four-sided frame of the window portion W, are unified to two sheets, improving the appearance of the portion that is likely to be noticed as the window portion W.

[0026] In the embodiment of the present invention configured as described above, the sheet-type shutter curtain 2 is configured such that the first and second sheet materials 7, 8 are connected together to form a first heat insulating space portion X continuously from top to bottom with the first connecting portion 21 sandwiched therebetween, and the second and third sheet materials 8, 9 are connected together to form a second heat insulating space portion Y between the upper and lower second connecting portions 22 with the first connecting portion 21 sandwiched therebetween. In this case, the first and second connecting portions 21, 22 are connected by heat fusion to facilitate and simplify the connecting work. In this case, as the heat fusion process, the first heat fusion process is performed to heat fusion the second and third sheet materials 8, 9 to form the second heat insulating space portion Y, and then the first and second sheets are connected to each other. A second heat sealing process is then carried out to form a first insulating space X in which the sheet materials 7, 8 are heat-sealed. In the second heat sealing process, heat sealing is performed with the non-heat-sealable material 15 sandwiched between the second sheet material 8 and the third sheet material 9 which is not heat-sealed. As a result, while the second heat sealing process is carried out with the first, second and third sheet materials 7, 8 and 9 stacked, only the second sheet material 8 and the first sheet material 7 are heat-sealed. The third sheet material 9 which has previously been heat-sealed to the second sheet material 8 is not further heat-sealed to the second sheet material 8. This allows the insulating space formed in the first heat sealing process to be easily and reliably maintained, thereby enabling efficient heat sealing work to be performed.

[0027] Moreover, in this case, the bottom portion 11, which is the lowest end of the shutter curtain 2, is formed in the second sheet material 8, which functions as the core material of the shutter curtain 2.The bottom portion 11 is formed by folding back the folded piece 8b, which is further extended from the extended lower piece 8a, onto the extended lower piece 8a, which is extended and formed on the lower end of the second sheet material 8 to form the bottom portion 11, and then heat-fusing the tip (upper end) of the folded piece 8b to the upper end of the extended lower piece 8a, thereby connecting them via the fourth connecting portion 24.As a result, whether the bottom portion fusion process for forming the bottom portion 11 is performed before or after the second heat-fusing process, the first connecting portion 21 and the fourth connecting portion 24 can be connected in a continuous state by a similar series of fusion operations, thereby improving workability.

[0028] Furthermore, in this device, the non-thermal-sealing material 15 required in the second heat-sealing process is attached to a portion of the third sheet material 9 corresponding to the first connecting portion 21 at a stage before the first heat-sealing process is carried out, so that the non-thermal-sealing material 15 can be easily sandwiched and arranged between the second sheet material 8 and the third sheet material 9, which will not be heat-sealed in the second heat-sealing process, thereby improving workability. After the second heat-sealing operation is completed, the non-thermal adhesive material 15 can be removed and reused, but it is not essential to remove it.

[0029] Of course, the present invention is not limited to the above-mentioned embodiment, and as in the second embodiment shown in Figure 14, the first and second heat sealing steps can be reversed, and the first heat sealing step can be a step of heat sealing the first sheet material 7 and the second sheet material 8 to form a first insulating space portion X, and the second heat sealing step can be a step of heat sealing the second sheet material 8 and the third sheet material 9 to form a second insulating space portion Y. In this case, the non-heat-sealable material 15 will be attached to any of the portions corresponding to the second connecting portion 22 of the first or second sheet material 7, 8 at a stage before the first heat sealing step is performed.

[0030] Furthermore, the present invention can also be implemented as a third embodiment shown in FIG. This device employs first and second sheet materials 7, 8 that are connected in a folded manner at a bottom portion 11 to form a continuous long sheet material. In this case, after the first heat sealing step in which the second sheet material 8 and the third sheet material 9 are heat sealed is performed, a folding back step is performed in which the first sheet material 7 is folded back at the bottom portion 11 to face the second sheet material 8 before the second heat sealing step is performed in which the first sheet material 7 is heat sealed to the second sheet material 8. In this case, the non-heat-sealable material 15 is attached to the third sheet material 9 or the second sheet material 8 in a portion corresponding to the first connecting portion 21 before the first heat sealing step is performed. With this configuration, an efficient shutter curtain 2 can be formed with a reduced number of parts. In this case, the bottom portion 11 and the first sheet material 7 are continuous with each other. If this continuous portion is unnecessary, the unnecessary portion may be removed. [Industrial Applicability]

[0031] The present invention can be used as a manufacturing method for a shutter curtain in a sheet-type shutter device that can be installed in an opening such as an entrance or exit of a building so as to be freely opened and closed. [Explanation of symbols]

[0032] 1 Shutter device 2. Shutter Curtain 3 Guide rail 5 Winding body 7 First sheet material 8 Second sheet material 8a Extension lower piece 8b Folded piece 8c Cutout 9. Third sheet material 10 End sheet material 10a End extension 11 Bottom section 12 Primary insulation material 13 Secondary insulation material 15 Non-thermal adhesive material 16 Bottom sheet material 16a Top edge 21 First connection part 22 Second connection part

Claims

1. A sheet-type shutter curtain that is installed to open and close openings such as entrances and exits of buildings. By connecting the first and second sheet materials with an appropriate gap between them, a cylindrical first insulation space is formed continuously from top to bottom across the first connecting portion, A third sheet material is connected to the second sheet material of the upper and lower first insulation space portions sandwiching the first connection portion via the second connection portion in a state in which the third sheet material straddles the first connection portion, so that a cylindrical second insulation space portion is formed continuously from top to bottom in a state in which the cylindrical second insulation space portion straddles the first connection portion, the first, second and third sheet materials have thermal adhesive properties, and the first and second connecting portions are formed by thermal adhesive bonding; the first and second connecting portions are formed by sequentially carrying out a first heat sealing process of heat sealing and connecting the second sheet material to either the first or third sheet material, and a second heat sealing process of heat sealing and connecting the second sheet material to the other of the first and third sheet materials, A manufacturing method for a shutter curtain in a sheet-type shutter device, characterized in that the second heat sealing process is carried out in a state in which a non-heat-sealable material made of a heat-resistant material that is not heat-sealable is sandwiched between the second sheet material in the portion to be heat-sealed by the second heat sealing process and one sheet material that is not heat-sealed to the second sheet material.

2. The first heat fusion step is a step of heat fusion bonding the second sheet material and the third sheet material to form a second insulating space portion, A method for manufacturing a shutter curtain in a sheet-type shutter device as described in claim 1, characterized in that the second heat sealing process is a process of heat sealing the second sheet material and the first sheet material to form a first insulating space portion.

3. The second sheet material includes an extended lower piece portion that is extended to form a bottom portion that is the lowest end of the shutter curtain, and a folded piece portion that is further extended from the extended lower piece portion and folded back, and the bottom portion is formed by connecting the tip of the folded piece portion to the extended lower piece portion by heat fusion, A method for manufacturing a shutter curtain in a sheet-type shutter device as described in claim 2, characterized in that a bottom portion fusion process for forming the bottom portion is performed either before or after the second heat fusion process.

4. The first and second sheet materials are continuous and connected in a folded manner at the bottom portion which is the lowest end of the shutter curtain, A manufacturing method for a shutter curtain in a sheet-type shutter device as described in claim 2, characterized in that after a first heat sealing process is performed in which the second sheet material and the third sheet material are heat sealed, a first sheet material folding process is performed in which the first sheet material connected to the second sheet material is folded back at the bottom portion to face the second sheet material, and then a second heat sealing process is performed in which the first sheet material and the second sheet material are heat sealed.

5. A method for manufacturing a shutter curtain in a sheet-type shutter device as described in claim 2, characterized in that the non-thermal adhesive material is attached to a portion of the second or third sheet material corresponding to the first connecting portion at a stage before the first thermal adhesive process is performed, thereby clamping the non-thermal adhesive material.

6. The first heat-sealing step is a step of heat-sealing the first sheet material and the second sheet material to form a first heat-insulating space portion, A method for manufacturing a shutter curtain in a sheet-type shutter device as described in claim 1, characterized in that the second heat sealing process is a process of heat sealing the second sheet material and the third sheet material to form a second insulating space portion.

7. A method for manufacturing a shutter curtain in a sheet-type shutter device as described in claim 6, characterized in that the non-thermal adhesive material is attached to a portion corresponding to the second connecting portion of the first or second sheet material at a stage before the first thermal adhesive process is performed, thereby clamping the non-thermal adhesive material.

8. 8. The method for manufacturing a shutter curtain in a sheet-type shutter device according to claim 5 or 7, wherein the non-thermal adhesive material is removed after the second fusion step is performed.

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