JP2013102100A - Solar power generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of attaching a solar power generation device, in which attaching material does not degrade nor bonding force degrades, for easy attaching or detaching, even if exposed to sunlight for a long period or exposed to severe temperature conditions.SOLUTION: On the rear surface of a solar power generation module, a surface fastener made from tetrafluoroethylene-ethylene copolymer is attached. More specifically, the surface fastener is a fastener in which many male-type engagement elements are provided upright in a row on the surface of a surface fastener substrate, and the male-type engagement elements have a stem having a square cross section which rises from the substrate and have an engagement projection which protrudes on both sides from the stem but does not protrude in row direction. Meanwhile, the surface fastener is also attached to the surface of an object to be attached. By causing both surface fasteners to engage with each other, the solar power generation module is attached to the surface of an object to be attached.

Description

  The present invention relates to a solar power generation device, more specifically, a solar power generation module, a tent, a surface of a flexible mounting object such as a soundproof sheet for construction, an agricultural sheet, a waterproof sheet, or a roof of a building. Can be attached to curved surfaces, etc., especially on the exterior material surface, withstands long-term outdoor sunlight exposure, harsh temperature and humidity conditions, changes and rain and snow, and can be attached or removed when necessary The present invention relates to a photovoltaic power generation apparatus that can be easily repeated many times, and that the adhesion to the mounting surface hardly decreases even when the attachment and removal are repeated.

  At present, commercially available photovoltaic power generation is broadly divided into crystalline silicon type and amorphous silicon type, and among these, crystalline silicon type has glass on the surface to increase the strength of the photovoltaic power generation element. A plate in which a plate is stacked and a reinforcing plate is stacked on the back surface is widespread, and a stainless plate, a plated steel plate, a galvanium steel plate or the like is used as the reinforcing plate. Such a crystalline silicon solar power generation module is used by being permanently fixed on a roof or exterior material of a building by a metal fitting such as a bolt.

  However, such a crystalline silicon type photovoltaic power generation module is reinforced with a stainless steel plate or a plated steel plate, so it has high rigidity, and a flexible sheet such as a tent, a soundproof sheet for construction, an agricultural sheet, etc. It is not suitable for mounting on the surface. In addition, when attaching to the surface of a building exterior material or roof surface, if the exterior material or roof material has a curved surface, the rigid photovoltaic power generation module cannot be bent easily. Installation is impossible or difficult. In addition, even when it is required to be replaced in about 10 years, such as a tarpaulin of a building, in the case of a rigid solar module, it is semipermanently firmly attached, so that it can be removed and reused. There is a drawback that the installation work becomes extremely complicated.

  In the case of an amorphous silicon type photovoltaic power generation module in contrast to a crystalline silicon type photovoltaic power generation module having such rigidity, the front and back surfaces of the photovoltaic power generation cell having flexibility are flexible. It is protected by a sheet made of tetrafluoroethylene-ethylene copolymer, and such a flexible solar power generation module has flexibility because it does not have a reinforcing metal plate or glass plate. It can be easily attached to the surface of the attachment object or the surface of the attachment object having a curved surface, or the surface of the attachment object that is required to be periodically attached and detached.

  As a method of attaching such a flexible photovoltaic power generation module to the surface of an object to be attached, conventionally, a method of applying an adhesive to the back surface of the photovoltaic power generation module and attaching it to the surface of the attachment object with an adhesive Is generally used. However, the adhesive strength of the adhesive changes with temperature, and the adhesive strength gradually decreases with the passage of time, and the adhesive strength is lost. The photovoltaic power module is peeled off from the surface of the object to be attached and falls. Has the problem. Furthermore, the adhesive has a problem that the adhesive strength is reduced by repeating the adhesion and peeling.

  As a method of solving the problem of this pressure-sensitive adhesive, a surface fastener is attached to the back surface of the photovoltaic power generation module with an acrylic-modified silicone adhesive, and the other surface that can be engaged with the surface fastener is also attached to the surface of the object to be attached. A method of attaching a solar module to the surface of an object to be attached by attaching a hook-and-loop fastener and engaging a double-sided fastener has been proposed (for example, Patent Document 1). In the same patent document, Scotchimate (registered trademark) Hook & Loop Fastener and Dual Lock (registered trademark) Fastener manufactured by Sumitomo 3M Limited are listed as specific examples of surface fasteners that can be used.

  However, these commercially available hook-and-loop fasteners are all made of polyolefins such as polypropylene and polyethylene, and resins such as nylons [The above Dual Lock (registered trademark) Fastener is made of polypropylene, and Scotchimate (registered) (Trademark) Hook & Loop Fastener is also made of polypropylene or nylon], and further, the hook-and-loop fastener is exposed to sunlight for a long period of time due to the shape of the engaging element of the hook-and-loop fastener. The hook-shaped engaging element, loop-shaped engaging element and hook-and-loop fastener base fabric deteriorate, the engaging element is pulled out from the base fabric, the hook head of the hook-shaped engaging element is detached, and the hook The engagement of the stem portion of the engagement element is lost Has the problem. Furthermore, there also occurs a phenomenon in which the adhesive force of the adhesive used to bond the hook-and-loop fastener to the back surface of the photovoltaic power generation module decreases with time.

JP 2010-263089 A

  In the present invention, such a conventional method of installing a photovoltaic power generation module is exposed to sunlight for a long time and exposed to severe temperature conditions, so that the hook-and-loop fastener deteriorates or the adhesive strength deteriorates. This eliminates the problem of lowering the engagement ability.

  That is, the present invention is a solar power generation device characterized in that a hook-and-loop fastener made of a tetrafluoroethylene-ethylene copolymer is attached to the back surface of the solar power generation module.

  Preferably, the hook-and-loop fastener has a plurality of male engaging elements arranged in a row on the surface of the substrate, and the male engaging elements are the same as the stem having a rectangular cross section rising from the substrate. From both sides, but does not protrude in the column direction, and both the substrate and the male engagement element are made of a tetrafluoroethylene-ethylene copolymer. Preferably, the rectangle is a parallelogram, and the photovoltaic module is of an amorphous silicon type.

Preferably, the photovoltaic module has a sheet made of a tetrafluoroethylene-ethylene copolymer on the front surface and the back surface, and the sheet made of the tetrafluoroethylene-ethylene copolymer on the back surface and the hook-and-loop fastener This is a case where the back surface is integrated by welding.
Furthermore, preferably, a loop surface fastener made of fluorine-based fiber is attached to the surface of the object to be attached, and the loop surface fastener and the surface fastener attached to the back surface of the photovoltaic power generation module are engaged with each other. This is a case where the power generation module is attached to the surface of the object to be attached, or a male surface fastener made of tetrafluoroethylene-ethylene copolymer is attached to the surface of the object to be attached. This is a case where the photovoltaic module is attached to the surface of the attachment object by engaging the hook-and-loop fastener attached to the back side of the photovoltaic module.

Further preferably, the male surface fastener attached to the surface of the object to be attached has a large number of male engaging elements arranged in a row on the surface of the substrate, and the male engaging elements are connected to the substrate. Having a rectangular cross-section stem rising from the same stem and engaging protrusions protruding from both sides but not in the column direction, and both the substrate and the male engagement element are tetrafluoroethylene-ethylene This is a case where it is formed from a copolymer.
Preferably, the attachment object is a flexible sheet made of a fabric or a resin film, and the attachment object is a film covering a tent or an agricultural greenhouse.

  Furthermore, the present invention is preferably used in such a photovoltaic power generation apparatus, and a large number of male engagement elements are erected in a row on the surface of the substrate, and the male engagement elements are separated from the substrate. The stem has a rectangular section that rises, and has an engaging protrusion that protrudes from both sides of the stem but does not protrude in the column direction. Both the substrate and the male engaging element are made of tetrafluoroethylene-ethylene. It is a hook-and-loop fastener formed from a polymer.

  According to the present invention, since the hook-and-loop fastener is made of a tetrafluoroethylene-ethylene copolymer, it can withstand long-term sunlight exposure, can withstand severe temperature conditions, and the hook-and-loop fastener is unlikely to deteriorate. . Further, preferably, as a hook-and-loop fastener, a large number of male engaging elements are erected in a row on the surface of the substrate, and the male engaging elements are formed from a stem having the rectangular cross section rising from the substrate and the same stem. What has a structure that has projections for engagement that protrude on both sides but do not protrude in the row direction is used. It can withstand long-term exposure to sunlight and harsh temperature and humidity conditions.

Further, as a means for attaching the hook-and-loop fastener to the back surface of the photovoltaic power generation module, when a method of fusing the surface fastener and the tetrafluoroethylene-ethylene copolymer constituting the back surface of the photovoltaic power generation module is used, as in the prior art Since it is not necessary to use a pressure-sensitive adhesive or an adhesive, it is possible to solve the problem caused by the pressure-sensitive adhesive or adhesive change or deterioration.
And in the solar power generation device of the present invention, when the object to be attached is a flexible sheet, and when the attachment and removal are repeated, the attachment / removal operation is easy, so that The features of the present invention can be exhibited.

It is a schematic diagram of the cross section of the solar power generation device of this invention. It is a perspective view of the hook_and_loop | surface fastener which comprises the solar power generation device of this invention. It is sectional drawing of an example of the extrusion nozzle used in manufacturing the surface fastener which comprises the solar power generation device of this invention.

Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of a suitable photovoltaic power generation apparatus targeted by the present invention. In the figure, 1 is a solar cell, 3 is a sheet for covering the light receiving surface of the solar cell and protecting the surface, 5 is a sheet for covering the anti-light receiving surface of the solar cell and protecting the back surface, The sheet 3 and the sheet 5 are usually formed of a tetrafluoroethylene-ethylene copolymer and are sheets having a thickness of 20 to 100 microns. As described above, the solar battery cell 1 is roughly divided into a crystalline silicon type and an amorphous silicon type, and the object of the present invention is preferably an amorphous silicon type. Usually, it is flexible in the form of a plate having a thickness of 10 microns or less. Of course, the present invention can also be applied to fixing a crystalline silicon type photovoltaic power generation module, but the amorphous silicon type can exhibit its features.

In the case of the amorphous silicon type, the front surface side adhesive layer 2 for integrating the surface protection sheet 3 on the light receiving surface of the solar battery cell 1, and the back surface protection sheet 5 integrated on the anti-light receiving surface of the solar battery cell. There is a back side adhesive layer 4 for this purpose. Usually, polyethylene, ethylene-vinyl acetate copolymer resin, or the like is used as the front-side adhesive layer 2 and the back-side adhesive layer 4, and the thickness is generally 100 to 1000 microns.
As described above, the photovoltaic module targeted by the present invention includes the solar battery cell 1, the protective sheets 3 and 5 for protecting the solar battery cell 1, and the adhesive layer for integrating the solar battery cell and the protective sheet. It is preferable that the photovoltaic module is formed of 2 and 4 and has flexibility.

  And the hook-and-loop fastener 8 is integrated in the back surface side of the photovoltaic power generation module of this invention as shown in FIG. The surface fastener 8 mainly includes a substrate 6 and a male engagement element 7 protruding from the substrate surface.

  FIG. 2 is a perspective view of the surface fastener 8. As is apparent from the figure, the hook-and-loop fastener has a large number of male engaging elements 7 arranged in a row on the surface of the substrate 6, and the male engaging elements 7 rise from the substrate 6. A cross-sectional stem and an engaging protrusion 9 that protrudes from both sides of the stem but does not protrude in the column direction, and the substrate 6 and the male engaging element 7 are both tetrafluoroethylene-ethylene It is formed from a copolymer. In the present invention, it is most preferable that such a surface fastener is integrated on the back surface of the photovoltaic power generation module.

  In such a hook-and-loop fastener, the engaging protrusion 9 is present at the upper part of the stem, but the stem above the base of the engaging protrusion may be collectively referred to as a head part. Therefore, it can be said that the male engagement element is composed of a stem portion having no engagement protrusion and a head portion existing above the stem portion.

  In the present invention, as the surface fastener, as shown in FIG. 2, a plurality of engaging elements 7 having engaging protrusions spread on both sides are arranged at regular intervals in the vertical direction (X direction shown in FIG. 2). Are arranged in a row, that is, arranged in a direction in which the engagement protrusions 9 do not exist, and a plurality of such rows exist in parallel in the horizontal direction (in FIG. 2, 2 Column).

  Conventionally, various types of male hook-and-loop fasteners have been known. As a typical example, monofilaments that become male engagement elements are woven into a hook-and-loop base fabric made of woven fabric, and the monofilament is looped from the base cloth in some places. Generally, a loop shape is fixed by floating and heat-treating, and one side surface of the loop is cut to form a hook-like engagement element. In addition, the loop of the same monofilament is cut at the apex and the cut end is melted and expanded into a bulge shape to form a hook-and-loop engagement element, and a countless cylindrical hole of molten resin. After the sheet is cooled on the drum, the resin sheet is peeled off from the drum surface to produce a sheet having a large number of cylindrical protrusions on the surface, and the tip of the cylindrical protrusion is pressed against the heating plate to Also known is a mushroom-like engaging element that is melted and spread in a disk shape.

  However, according to the research results of the present inventors, it has been found that the male surface fastener as shown in FIG. 2 is most excellent in light resistance as compared with the above surface fastener. Although the cause is not necessarily clear, the engagement elements are thicker than other hook-and-loop fasteners, the engagement elements are closely arranged, and the protrusion direction of the engagement protrusion from the stem of the engagement element There are only two directions in the side direction, not the entire circumference of the stem like a normal mushroom-type engagement element, so the head of the engagement element will be disengaged even when engagement and separation are repeated. There are things that are difficult to tear off.

  Both the substrate 6 and the male engagement element 7 are made of a tetrafluoroethylene-ethylene copolymer. The tetrafluoroethylene-ethylene copolymer is a copolymer of ethylene and tetrafluoroethylene, and is generally called an ETFE resin and is commercially available. In the present invention, those having an ethylene copolymerization ratio of 30 to 70 mol% are preferred from the viewpoint of moldability, and a more perfect male-shaped engagement element can be molded. More preferably, the ethylene copolymerization ratio is 40 to 60. Mol%. Of course, as long as the amount is small, other copolymer components may be copolymerized, and a resin other than the tetrafluoroethylene-ethylene copolymer may be blended. Furthermore, various stabilizers such as ultraviolet absorbers, antioxidants and hydrolysis resistance, pigments and dyes are added to the tetrafluoroethylene-ethylene copolymer constituting the surface fastener. It may be applied to the surface. Furthermore, in order to improve the adhesiveness with the target object stuck on a back surface, the board | substrate back surface of a hook_and_loop | surface fastener may be made into the uneven | corrugated shape, or the protrusion for anchors may be provided.

  The hook-and-loop fastener used in the present invention is preferably a hook-and-loop fastener having a male engagement element as shown in FIG. 2, but in this case, as described above, the head fastener includes a stem portion and a head portion. As described above, the portion has the engaging protrusion 9 protruding in the side direction from the upper portion of the stem, and the engaging protrusion protrudes from the stem to both sides. The stem usually stands upright from the substrate 6. In order to increase the engaging force, the engaging protrusion 9 protrudes in a direction parallel to the substrate or in such a direction that the tip portion is lowered to the substrate side from the parallel.

Next, the size of the male surface fastener as shown in FIG. 2 which is a male surface fastener suitable for the present invention will be described.
First, in such a hook-and-loop fastener, the distance between the engagement protrusion of the male engagement element and the engagement protrusion of the male engagement element adjacent in the protrusion direction of the protrusion is in the range of 0.5 to 2.5 mm. When the width is smaller than 0.5 mm, it is difficult to insert the engaging element, and a sufficient engaging force cannot be obtained. On the other hand, when the width is larger than 2.5 mm, the engaging element density becomes low, and a sufficient engaging force cannot be obtained.

Further, the height of the male engagement element is preferably 1.2 to 3.0 mm. If the height is less than 1.2 mm, sufficient engagement force cannot be obtained, and 3.0 mm When the value exceeds the value, the engaging element easily falls. More preferably, it is the range of 1.5-2.5 mm, More preferably, it is the range of 1.6-2.4 mm.
Furthermore, it is preferable that the engagement protrusion protrudes from the stem by 0.2 to 0.8 mm. If the protrusion is shorter than 0.2 mm, sufficient engagement force cannot be obtained, and if the protrusion is longer than 0.8 mm, the engagement becomes too strong, and the mating engagement element is damaged during peeling. More preferably, it is 0.3-0.6 mm. The engaging protrusion is usually formed of the same resin as the stem, that is, a tetrafluoroethylene-ethylene copolymer, and is formed simultaneously with the formation of the stem.

Further, the thickness in the row direction of the male engagement element is preferably in the range of 0.2 to 2.0 mm. More preferably, it is the range of 0.25-0.8 mm from the point of engagement force. The thickness of the stem portion is 0 in terms of engagement force and further in terms of light resistance to sunlight, and the cross-sectional area on the plane parallel to the substrate (the plane parallel to the midpoint of the stem height) is 0. A range of .1 to 0.8 mm ² is preferred. Then, as the density of the male engaging elements, preferably in terms of engaging force and light resistance in the range of 20 to 60 pieces / cm ^2, more preferably in the range of 30 to 50 pieces / cm ^2.

  Furthermore, in the hook-and-loop fastener having a shape as shown in FIG. 2, which is preferably used in the present invention, the cross-sectional shape of the engaging element stem in a plane parallel to the substrate is inevitably due to the use of a manufacturing method as described later. However, it is preferable that the cross-sectional shape is a parallelogram since a high engaging force can be obtained by effectively utilizing the top of the engaging protrusion. That is, when the hook-and-loop fastener is viewed from above, it is preferable that the engaging projection has an acute apex in the range of 60 to 85 degrees.

  The male surface fastener suitably used in the present invention has a shape as shown in FIG. 2, but the male surface fastener having such a shape is an engagement element as compared with other male surface fasteners. It has a feature that the stem of the engaging element is thick for a high density, and this feature point is due to long-term sunlight exposure and harsh usage conditions when used as an engaging member of a solar power generation device. This is one of the major causes of resistance.

  Next, as a surface fastener suitable for the present invention, a large number of male engaging elements are erected in a row on the surface of the substrate, and the male engaging elements are formed in a rectangular section stem rising from the substrate; And a protrusion for engagement that protrudes from the stem on both sides but does not protrude in the column direction, and the substrate and the male engagement element are both formed of a tetrafluoroethylene-ethylene copolymer. A method for manufacturing the male surface fastener will be described.

  First, a tetrafluoroethylene-ethylene copolymer is melt-extruded into a tape shape from a nozzle 10 having a slit as shown in FIG. A tape-like material having a plurality of rows having continuous mushroom-like engaging element cross sections is molded. Reference numeral 11 shown in FIG. 3 denotes a linear slit that forms a substrate, and reference numeral 12 denotes an engaging element slit that forms a male engaging element. When the nozzle as shown in FIG. 3 is used, a tape-like object is obtained in which rows of male engaging elements standing upright on the substrate surface are present at equal intervals of 9 rows. The number of rows is preferably 5 to 15 rows per 1 cm of tape width after stretching. The tape width is preferably 20 to 50 mm.

  Next, the engagement element rows existing on the surface of the obtained tape-like material are cut from the tip of the row to the vicinity of the root at small intervals in a direction transverse to the length direction of the row. In this case, when the angle of the cut is perpendicular to the length direction of the tape-like object, the cross-sectional shape of the stem of the engaging element is a square or a rectangle, and when it is deviated from the right angle, a parallelogram is formed. As the shift angle increases, the parallelogram becomes sharper. The interval between the cuts is preferably in the range of 0.2 to 0.6 mm, particularly 0.3 to 0.5 mm.

  Next, the tape-like material with the cut is stretched in the length direction. As the draw ratio, such a degree that the length of the tape-like material after stretching is 1.3 to 3.5 times the length of the original tape-like material is employed. By this stretching, the cuts formed in the rows are expanded, and the rows become a row of a large number of male engaging elements that are independent. More preferably, the stretching is 1.6 to 2.5 times.

  Next, the back surface of such a hook-and-loop fastener is attached to the back surface of the photovoltaic power generation module. There are various attachment methods such as an attachment method using an adhesive, an attachment method using an adhesive, etc., but the sheet made of a tetrafluoroethylene-ethylene copolymer present on the back side of the module is another resin or an adhesive. It is difficult to obtain a high peel strength over a long period of time.

  In the present invention, the back surface of the photovoltaic power generation module is covered with a sheet of tetrafluoroethylene-ethylene copolymer, and the hook-and-loop fastener used in the present invention is also composed of a tetrafluoroethylene-ethylene copolymer. It is preferable to use a method of bonding the back surface of the hook-and-loop fastener and the back surface of the photovoltaic power generation module using a method of fusing both. As a method for bonding, a normal fusing device can be used.

  In the hook-and-loop fastener constituting the present invention, there is used a method in which a base layer in a region where no engaging element exists is present along the engaging element row, and this region is melted and fused to the back sheet of the photovoltaic power generation module. be able to. And a hook-and-loop fastener may exist in the back surface whole surface of a photovoltaic power generation module, or you may make it exist mainly in a corner and a side part.

  As described above, the solar power generation device with a hook-and-loop fastener according to the present invention is a surface of a flexible sheet such as a tent, a soundproof sheet for construction, a curing sheet, an agricultural sheet, a waterproof sheet, Although it is suitable for attaching to a part having a curved surface, such as an outer wall or a roof, a surface that can be engaged with a hook-and-loop fastener attached to the back surface of the photovoltaic power generation module on the surface of such an attachment object The fastener is attached, and the photovoltaic module is fixed to the surface of the attachment object by engaging the surface fastener attached to the back surface of the photovoltaic module and the surface fastener attached to the surface of the attachment object. Become.

  As the surface fastener to be attached to the surface of the object to be attached, a normal surface fastener can be used, but preferably a surface fastener having resistance to sunlight exposure is preferable, for example, a loop surface fastener made of fluorine-based fibers or tetrafluoroethylene. -A surface fastener having a mushroom-type engagement element made of an ethylene copolymer is exemplified, and in particular, a large number of male engagement elements are arranged in a row on the surface of the substrate. The element has a rectangular cross-section stem rising from the substrate, an engaging protrusion that protrudes from the stem to both sides but does not protrude in the column direction, and both the substrate and the male engagement element are tetra A hook-and-loop fastener made of a fluoroethylene-ethylene copolymer is particularly preferable in terms of resistance to sunlight exposure and severe temperature and humidity conditions. Arbitrariness.

  In particular, the male surface fastener to be attached to the back surface of the photovoltaic module is attached with a male surface fastener having a different interval between the engaging element rows, or the row direction of the male surface fastener to be attached to the back surface of the photovoltaic module. It is preferable to attach to the surface of an attachment target object so that it may cross.

  As a method of attaching the hook-and-loop fastener to the surface of the attachment object, when the attachment object is a woven fabric or a non-woven fabric, it can be attached by sewing or an adhesive. Further, it can be attached to the outer wall of the building, roofing material or the like with an adhesive or metal fittings. Examples of the adhesive at this time include those that can withstand long-term exposure to sunlight, for example, fluorine-based adhesives. In addition, when the object to be attached is not required to endure exposure to sunlight as much as the photovoltaic power generation module, for example, in the case where the object to be replaced is replaced for a certain period, a normal adhesive or adhesive may be used.

  As described above, the photovoltaic power generation apparatus of the present invention has flexibility, extremely excellent sunlight exposure resistance and excellent resistance under severe temperature and humidity conditions, and is extremely easy to attach and detach. It is also suitable for the field of temporary mounting. For example, by attaching it to the surface of a tent used for an event, it can be used as a power source for lighting in the tent, light-emitting display materials and electrical equipment, or by attaching it to the outer surface of a sheet that will be the roof material of a dome stadium. As a power source for electricity, lighting and advertising neon signs, and by attaching to the surface of soundproof sheets and curing sheets that cover the construction site, it can be used as a power source for lighting and warning lighting devices and appliances in the construction site. By attaching it to the surface of an agricultural house, it can be used as a lighting for promoting or suppressing the growth of crops, or as a power source for insect repellent lamps or pumps. Furthermore, it can be used as a home power supply.

  Further, since it can be attached to a curved surface of a building or the like, it is possible to attach a solar power generation device to a place where it was impossible to attach the conventional crystalline silicon solar power generation module. Furthermore, since it is very easy to attach and detach, it is suitable for mounting on a waterproof sheet or the like that is required to be replaced in a certain period.

  Moreover, since the hook-and-loop fastener used in the present invention has extremely excellent resistance to exposure to sunlight, it is suitable not only for fixing a photovoltaic power generation module but also for application fields that are exposed to sunlight indoors and outdoors. Can be used. For example, fixing of exterior wall materials to walls, fixing materials for curtains to curtain rails, fixing of roofing materials, fixing of curing sheets used at construction sites, sheets for tents and agricultural tunnel houses, sheets for agriculture and horticulture, etc. It is preferably used for fixing fishery nets, fishing nets, ropes, etc., fixing members used in parts exposed to sunlight on vehicles such as automobiles and ships, and fixing road signs and signs.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1
A tetrafluoroethylene-ethylene copolymer (C-88AXP manufactured by Asahi Glass Co., Ltd., ethylene copolymerization ratio 50 mol%) is used as the resin, and the nozzle shown in FIG. 3 (however, a slit that will form a mushroom-type engagement element) 10)), a melt of the same resin is extruded at 320 ° C. and immediately poured into cold water to prepare a tape-like product having 10 rows of engaging element rows on the surface. A line is cut at intervals of 0.32 mm from the top to the root of the row of engaging elements in the row in a direction inclined 20 degrees perpendicular to the tape length direction, and it is 2.5 times at 220 ° C. in the tape length direction. In this state, the film was stretched and heat fixed at 220 ° C. for 1 minute to obtain a male surface fastener.

In the obtained male surface fastener, mushroom-type engaging elements are arranged in a row on the surface of the substrate, and each mushroom-type engaging element has a stem portion having a parallelogram cross section and an upper portion thereof only in the side direction. And the tip of the protrusion is slightly lowered. And it has ten engaging element rows, the thickness of the substrate is 0.25 mm, the engaging element height is 1.2 mm, and the interval between the engaging elements adjacent in the engaging element row direction is 0.33 mm. The engagement element row direction stem width is 0.32 mm, the stem width in the direction orthogonal to the engagement element row direction is 0.37 mm, the stem interval between adjacent engagement element rows is 1.9 mm, and the engagement element is engaged. The protrusion length of the protrusion was 0.45 mm, and the engaging element density was 35 / cm ² .

  The substrate back surface of the male surface fastener is overlaid on the end of a small back sheet (tetrafluoroethylene-ethylene copolymer) of a commercially available amorphous silicon solar photovoltaic module (Fuji Electric Co., Ltd.), 320 The heating body heated to 0 ° C. was pressed against the end portion, and the portion where the engagement element at the end of the hook-and-loop fastener was not present was heat-sealed to the back sheet and integrated.

On the other hand, the same surface fastener as the above male surface fastener is integrated by heat fusion on the surface of the agricultural vinyl chloride film, and the male surface fastener on the back surface of the photovoltaic power generation module is superimposed on the surface, The engaging elements were engaged with each other. However, it was made to engage so that the protrusion direction of the protrusion of an engagement element may intersect.
Engagement can be easily done by superimposing the hook-and-loop fastener affixed to the surface of the agricultural film and the hook-and-loop fastener affixed to the back surface of the photovoltaic power generation module and pressing lightly from above. In addition, the separation of the engagement can be easily performed by lifting the photovoltaic power generation module from the agricultural film surface, and the engagement and separation can be repeated very easily and without any effort. did it.

The obtained agricultural sheet with a solar power generation module was subjected to a sunshine weatherometer test. The conditions of the sunshine weatherometer test are as follows.
[test conditions]
Using a sunshine weatherometer Black panel temperature and time: 2000 hours at 83 ° C

  After the test, the engagement and release of the double-sided fastener was repeated 500 times, but no difference was found in the damage to the engaging element of the surface fastener compared to the case where the test was not performed. In addition, no deterioration was observed with respect to the engaging force of the hook-and-loop fastener before and after the test.

Comparative Example 1
In the said Example, the male surface fastener was produced like the said Example except having replaced the resin which comprises a male surface fastener with a commercially available polypropylene resin (Japan Polypro EA7A). And this surface fastener was heat-sealed to the small piece of a photovoltaic power generation module similarly to the said Example. Similarly, it was fused to the agricultural film. Similarly, the two were overlapped to engage the engaging elements, and a sunshine weatherometer test was performed. As a result, the engaging force of the hook-and-loop fastener was reduced to 30% before and after the test, and there were many cases where the engaging element was broken in some places and the head part was broken after the test.

Comparative Example 2
In the above embodiment, as a male surface fastener to be attached to the back surface of the photovoltaic power generation module, it is replaced with a commercially available nylon fiber woven hook surface fastener [A03800-00 made by Kuraray Fastening Co., Ltd.] and attached to an agricultural film. As a hook-and-loop fastener, a commercially available nylon fiber woven loop hook-and-loop fastener [Kuraray Fastening Co., Ltd. B10000-00] was used in the same manner as in the above example, except that a commercially available acrylic pressure-sensitive adhesive was used. The woven hook hook-and-loop fastener was attached to the back side of the small piece of the photovoltaic module, and the woven loop hook-and-loop fastener was attached to the surface of the agricultural film.

In the same manner as in the above embodiment, the two were overlapped to engage the engaging elements of the double-sided fastener, and a sunshine weatherometer test was performed.
As a result, whether the adhesive has deteriorated or peeled off at the adhesive site, the engaging force of the hook-and-loop fastener is reduced to 50% before and after the test, and the engaging element is further cut or engaged from the hook-and-loop fastener base fabric. Many of the fibers for the composite element were pulled out.

DESCRIPTION OF SYMBOLS 1 ... Solar cell 2, 4 ... Adhesive layer 3, 5 ... Protective sheet 6 ... Surface fastener board | substrate 7 ... Engagement element 8 ... Surface fastener 9 ... Engagement protrusion 10 ... Extrusion nozzle 11 ... Slit for substrate 12 ... Slit for engagement element

Claims (11)

  A photovoltaic power generation apparatus, wherein a hook-and-loop fastener made of a tetrafluoroethylene-ethylene copolymer is attached to the back surface of the photovoltaic power generation module.   A hook-and-loop fastener is provided with a large number of male engaging elements arranged in a row on the surface of the board, and the male engaging elements protrude from the same stem to the both sides of a rectangular section stem rising from the board. 2. The sun according to claim 1, further comprising engaging protrusions that do not protrude in the column direction, and wherein the substrate and the male engaging element are both formed of a tetrafluoroethylene-ethylene copolymer. Photovoltaic generator.   The solar power generation device according to claim 2, wherein the rectangle is a parallelogram.   The photovoltaic power generation apparatus according to any one of claims 1 to 3, wherein the photovoltaic power generation module is of an amorphous silicon type.   The photovoltaic power generation module has a sheet made of tetrafluoroethylene-ethylene copolymer on the front and back surfaces, and the sheet made of tetrafluoroethylene-ethylene copolymer on the back surface and the back surface of the hook-and-loop fastener are integrated by welding. The photovoltaic power generator according to any one of claims 1 to 4.   A loop hook-and-loop fastener made of fluorine-based fibers is attached to the surface of the object to be attached, and the solar photovoltaic module is attached to the object by engaging the loop fastener and the hook-and-loop fastener attached to the back of the photovoltaic module. The solar power generation device in any one of Claims 1-5 attached to the surface of.   A male surface fastener made of tetrafluoroethylene-ethylene copolymer is attached to the surface of the object to be attached, and this male surface fastener and the surface fastener attached to the back side of the photovoltaic power generation module are engaged. The solar power generation device according to any one of claims 1 to 5, wherein the solar power generation module is attached to the surface of the object to be attached.   A male surface fastener attached to the surface of an object to be attached has a large number of male engaging elements arranged in a row on the surface of the board, and the male engaging elements have a rectangular cross section rising from the board. A stem and an engaging protrusion that protrudes from both sides of the stem but does not protrude in the row direction, and the substrate and the male engaging element are both formed of a tetrafluoroethylene-ethylene copolymer. The solar power generation device according to claim 7.   The photovoltaic power generator according to any one of claims 1 to 8, wherein the attachment object is a flexible sheet made of a fabric or a resin film.   The photovoltaic power generation apparatus according to claim 9, wherein the flexible sheet made of a fabric or a resin film is a film that covers a tent or an agricultural greenhouse.   A large number of male engaging elements stand in a row on the surface of the substrate, and the male engaging elements protrude from the stem on both sides from the same stem as a rectangular section stem rising from the substrate. The hook-and-loop fastener has a protrusion for engagement that does not protrude, and the substrate and the male engagement element are both formed of a tetrafluoroethylene-ethylene copolymer.

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