JP2011230808A - Roll of solar cell sealing sheet, and package for solar cell sealing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package for a solar cell sealing sheet for suppressing corrugation of the solar cell sealing sheet and further facilitating taking a roll out of a package by decreasing vibrations applied to the roll.SOLUTION: The roll has a winding core, and the solar cell sealing sheet rolled around the winding core. The solar cell sealing sheet has a surface in which emboss grooves are formed. The width of the solar cell sealing sheet is 350-1,400 mm, the take-up diameter of roll is 200-600 mm, and the projection amount of the winding core from a width direction of the solar cell sealing sheet is 2-15 mm.

Description

  The present invention relates to a roll body of a solar cell encapsulating sheet and a package body of a solar cell encapsulating sheet.

  The solar cell module is formed by laminating a surface side transparent protective member, a solar cell encapsulating sheet, a solar cell, a solar cell encapsulating sheet, and a back surface side protecting member in this order; Manufactured by crosslinking and curing the sheet. In order to suppress such cracking of the solar battery cells and poor deaeration due to the heating and pressurization, various embossing processes are performed on the surface of the solar battery sealing sheet (see, for example, Patent Document 1).

  Such a solar cell encapsulating sheet is stored and transported in the form of a roll wound around a core as in the case of a normal long sheet (see Patent Documents 2 and 3, etc.).

JP 2000-183388 A Japanese Patent Laid-Open No. 5-201485 Japanese Patent No. 4196771

  However, between the solar cell encapsulating sheets formed with embossing, when a stress (impact) is applied to the roll body due to vibration during the transportation process, the roll body is deformed in a bowl shape, and the sheet is likely to be wavy. was there. Such sheet undulation is particularly likely to occur in a sheet having weak stiffness or a sheet having a high surface slipperiness that has been embossed. Furthermore, in a packaging container storing a plurality of roll bodies, stress due to vibration is easily applied to the roll bodies in a complicated manner. For this reason, in a conveyance process, it is calculated | required to reduce as much as possible the stress added to a roll body by a vibration.

  Moreover, it is also required to facilitate the removal of the roll body from the packaging container.

  The present invention has been made in view of such circumstances, and by suppressing the stress applied to the roll body by vibration, the undulation of the solar cell encapsulating sheet is suppressed, and further, the roll body from the packaging container It aims at providing the package of the solar cell sealing sheet which makes taking out easy.

  As shown in FIG. 8, “rolling” of the roll body tends to occur at the end in the width direction of the roll. The present inventors have found that the “waving” generated at the widthwise end of the roll occurs in the roll body accommodated on the inner surface side of the packaging container, among the plurality of roll bodies accommodated in the packaging container. Since it is easy, it has been found that it is mainly caused by “asynchronization of the vibration of the packing container and the vibration of the roll body”.

  In order to eliminate the “asynchronism between the vibration of the packaging container and the vibration of the roll body”, the inventors have 1) a support structure in which the packaging container and the roll body are integrated, specifically, In addition, by appropriately adjusting the amount of winding of the roll core in the roll body, the core and the sheet width direction end are supported in a balanced manner by the support member, and 2) the gap between the roll body and the packaging container is reduced. It was found that it is effective to do. The present invention has been made based on such knowledge.

The present invention relates to the following roll body of a solar cell encapsulating sheet and its package.
[1] A roll body having a winding core and a solar cell encapsulating sheet wound around a circumferential surface of the winding core, and an emboss is formed on the surface of the solar cell encapsulating sheet. The width of the solar cell encapsulating sheet is 350 to 1400 mm, the winding diameter of the roll body is 200 to 600 mm, and the core protrudes from the end in the width direction of the solar cell encapsulating sheet. The roll body of the solar cell sealing sheet whose quantity is 2-15 mm.
[2] The roll body according to [1], wherein the emboss depth is 5 to 90% with respect to the maximum thickness of the solar cell encapsulating sheet in the thickness direction of the solar cell encapsulating sheet.
[3] The roll body according to [1] or [2], wherein the core is a tube, the inner diameter of the core is 75 mm to 155 mm, and the wall thickness is 4 to 15 mm.
[4] The roll body according to any one of [1] to [3], wherein the material of the core is made of paper or resin.
[5] The solar cell encapsulating sheet is a resin selected from the group consisting of an ethylene copolymer, a modified polyethylene resin, and polyvinyl butyral, and has a melt flow rate (MFR) of 0.1 to 100 g / 10 min. The roll body in any one of [1]-[4] containing resin which is.
[6] The roll body according to [5], wherein the ethylene copolymer is an ethylene-vinyl acetate copolymer.

[7] The plurality of roll bodies according to any one of [1] to [6], a packaging container that accommodates the plurality of roll bodies, and a core of the roll body that is disposed on a bottom surface in the packaging container And a support member having a plurality of recesses or through-holes into which the roll core is supported by the recesses or through-holes of the support member, and the widthwise end of the roll body is The package of the solar cell sealing sheet which is in contact with the surface of the support member.
[8] The package of the solar cell encapsulating sheet according to [7], wherein a depth of the concave portion or the through hole of the support member is larger than a protruding amount of the core of the roll body.
[9] The package of the solar cell encapsulating sheet according to [7] or [8], wherein a gap between an end surface of the support member and an inner surface of the packing container is 20 mm or less.
[10] The package of the solar cell sealing sheet according to any one of [7] to [9], further including a partition member that partitions the plurality of roll bodies.
[11] The solar cell sealing according to any one of [7] to [10], further including a bundling member that is wound so as to include the plurality of roll bodies and that bundles the plurality of roll bodies. Sheet packaging.

  According to the present invention, by reducing the stress applied to the roll body by vibration, it is possible to suppress the undulation of the solar cell encapsulating sheet and further facilitate the removal of the roll body from the packaging container.

It is a schematic diagram which shows an example of the roll body of a solar cell sealing sheet. It is a disassembled perspective view which shows an example of the package body of a solar cell sealing sheet. It is a side view which shows an example of the support state of a roll body. It is a disassembled perspective view which shows the other example of the package body of a solar cell sealing sheet. It is the figure which looked at the arrangement state of the roll body in a packing container from the top. It is a top view which shows the supporting member in an Example. It is a figure which shows the corrugation depth of a roll body. It is a figure which shows the wave of a roll body.

1. Solar cell encapsulating sheet The solar cell encapsulating sheet in the present invention contains, as a main component, a resin selected from the group consisting of an ethylene copolymer, a modified polyethylene resin, and polyvinyl butyral. An auxiliary agent, an adhesion-imparting agent, and the like may further be included.

  Examples of ethylene-based copolymers include ethylene-vinyl ester (eg, vinyl acetate, vinyl propionate, etc.) copolymers; ethylene- (meth) acrylate esters (eg, methyl acrylate, ethyl acrylate, isobutyl acrylate, N-butyl acrylate, methyl methacrylate, etc.) copolymer; ethylene- (meth) acrylic acid copolymer, ethylene-α olefin (for example, propylene, 1-butene, 1-hexene, 1-octene, 4-methyl- A copolymer such as 1-pentene is preferably used.

  The ethylene content in the ethylene copolymer is preferably 64 to 86% by weight. When the ethylene content is less than 64% by weight, the softening temperature of the copolymer is lowered, causing a problem of blocking between the solar cell sealing sheets, and the workability may be lowered. On the other hand, when the ethylene content exceeds 86% by weight, the solar cell sealing sheet becomes hard and the solar cell element may be cracked.

  Examples of modified polyethylene resins include modified polyethylene obtained by modifying polyethylene with an ethylenically unsaturated silane compound (for example, a graft copolymer of a polyethylene material and a vinyl silane compound), and a resin composition containing the same Things are included.

  The melt flow rate (MFR) measured at a temperature of 190 ° C. according to JIS K7210-1999 of a resin selected from the group consisting of the ethylene copolymer, modified polyethylene resin and polyvinyl butyral is 0.1 to 100 g / 10 min is preferable, and 4 to 50 g / 10 min is more preferable. If the melt flow rate is less than 0.1 g / 10 min, the resin fluidity is poor, so that the unevenness of the surface of the solar battery cell cannot be filled, and voids are easily formed. On the other hand, when the melt flow rate is larger than 100 g / 10 min, the fluidity of the resin itself is excellent, but the resin easily protrudes in the laminating process.

  The melt flow rate of the resin can be measured with a melt indexer at a temperature of 190 ° C. and a load of 2.16 kg.

  Among ethylene-based copolymers, ethylene-vinyl acetate copolymer (EVA) satisfies the required physical properties of solar cell sealing sheets such as moldability, transparency, flexibility, adhesion, and weather resistance. Are particularly preferred.

  The ethylene-vinyl acetate copolymer (EVA) can be a copolymer of ethylene and vinyl acetate, preferably a random copolymer. The content of the structural unit derived from vinyl acetate in the ethylene-vinyl acetate copolymer is preferably 20 to 38% by weight, more preferably 24 to 36% by weight, still more preferably 26 to 34% by weight. is there. However, the total of the content of structural units derived from ethylene and the content of structural units derived from vinyl acetate is 100% by weight.

  The crosslinking agent can improve the heat resistance and weather resistance of the solar cell encapsulating sheet by crosslinking the ethylene-vinyl acetate copolymer (EVA). As such a cross-linking agent, an organic peroxide that generates radicals at 100 ° C. or higher is generally preferred. In particular, considering the stability at the time of blending, an organic peroxide having a decomposition temperature of 10 hours half-life of 70 ° C. or higher. Oxides are more preferred.

  Examples of such organic peroxides include 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 3-di-t-butyl peroxide, t-dicumyl peroxide, 2 , 5-Dimethyl-2,5-di (t-butylperoxy) hexyne, dicumyl peroxide, α, α'-bis (t-butylperoxyisopropyl) benzene, n-butyl-4,4-bis ( t-butylperoxy) butane, 2,2-bis (t-butylperoxy) butane, 1,1-bis (t-butylperoxy) cyclohexane, 1,1-bis (t-butylperoxy) 3, 3,5-trimethylcyclohexane, t-butyl peroxybenzoate, benzoyl peroxide and the like are included.

  The content of the crosslinking agent is preferably 0.1 to 3.0 parts by weight and more preferably 0.2 to 2.0 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate copolymer. preferable.

  The adhesiveness imparting agent can improve the adhesiveness of the solar cell encapsulating sheet to the power generation element. The adhesiveness imparting agent is preferably a silane coupling agent. Examples of silane coupling agents include γ-chloropropyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, vinyl-tris- (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, β- ( 3,4-ethoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane and N-β- (aminoethyl) ) -Γ-aminopropyltrimethoxysilane and the like. The content of these silane coupling agents is usually preferably 0.1 to 3.0 parts by weight, and preferably 0.2 to 1.5 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate copolymer. It is more preferable that

  The crosslinking assistant can increase the crosslinking reactivity of the ethylene-vinyl acetate copolymer and improve the durability of the solar cell encapsulating sheet. Examples of the crosslinking aid include trifunctional crosslinking aids such as triallyl isocyanurate and triallyl isocyanate, and trimethylolpropane triacrylate.

  The solar cell encapsulating sheet may further contain other additives such as a colorant, an ultraviolet absorber, an anti-aging agent, a discoloration preventing agent, a heat stabilizer, an ultraviolet (weather resistance) stabilizer, and a light stabilizer as necessary. Good.

  Examples of colorants include inorganic pigments such as metal oxides and metal powders; organic pigments such as azo, phthalocyanine, azo, and acidic or basic dye lakes.

  Examples of ultraviolet absorbers include benzophenone series such as 2-hydroxy-4-octoxybenzophenone and 2-hydroxy-4-methoxy-5-sulfobenzophenone; 2- (2′-hydroxy-5-methylphenyl) benzo Benzotriazole systems such as triazole; hindered amine systems such as phenyl salicylate and pt-butylphenyl salicylate are included.

  Anti-aging agents include amines, phenols, bisphenyls and hindered amines, such as di-t-butyl-p-cresol and bis (2,2,6,6-tetramethyl-4- Piperazil) sebacate and the like. Examples of the ultraviolet light (weather resistance) stabilizer include dibutylhydroxytoluene. Further, hydroquinone, hydroquinone monomethyl ether, p-benzoquinone, methylhydroquinone, and the like may be included in improving the stability of the ethylene-vinyl acetate copolymer.

  The thickness of the solar cell encapsulating sheet is, for example, about 100 μm to 2000 μm, and preferably 200 μm to 1000 μm.

  Embossing is formed on the surface of the solar cell encapsulating sheet in the present invention in order to improve cushioning and deaeration in the heat curing step.

  The shape of the embossing may be a shape that can impart a uniform cushioning property to the solar cell encapsulating sheet, and examples thereof include a lattice shape, a turtle shell shape, a pyramid shape, a marimo shape, and a satin shape.

  The arrangement interval (pitch) of the convex portions forming the emboss is preferably 100 to 2000 μm, more preferably 200 to 1800 μm, and further preferably 300 to 1300 μm. Even if the pitch of the convex portions is too small or too large, the cushioning property of the solar cell encapsulating sheet is lowered, so that the solar cells are easily broken.

  The embossing depth is preferably 5 to 90%, more preferably 5 to 80%, with respect to the maximum thickness of the solar cell sealing film. Specifically, the depth of the emboss is the top of the convex part (the highest part of the convex part) and the bottom of the concave part (the lowest part of the concave part) in the thickness direction of the solar cell encapsulating sheet. The distance. The embossing depth is preferably 20 to 1000 μm, more preferably 30 to 500 μm. If the embossing depth is too small, the cushioning property may be insufficient. If the embossing depth is too large, the solar cell sealing sheet in the recesses becomes too thin, and a hole is opened in the heating and pressing process. It becomes easy.

  The embossing width is preferably 1 to 6 times the embossing depth, and more preferably 2 to 5 times. The width of the emboss refers to the maximum width of the convex portion that forms the emboss. If the width of the emboss is too small, the concavo-convex shape has a steep gradient and the deaeration tends to decrease.If the width of the emboss is too large, the cushioning property decreases and blocking between the solar cell encapsulating sheets occurs. It becomes easy to do.

  Such a solar cell encapsulating sheet is transported in the form of a roll wound around a core.

  As described above, since the stress due to the vibration in the transportation process is applied to the roll body of the solar cell encapsulating sheet, the surface of the roll body of the solar cell encapsulating sheet is easily waved. Such sheet undulation is more likely to occur on the material side as the material is weaker, and on the physical side, the surface is more likely to slip. For this reason, in terms of materials, the ethylene-vinyl acetate copolymer (EVA) is more likely to be wavy than the modified polyethylene resin; on the physical side, it is generally embossed (depending on the composition of the sheet). The sheet is more likely to be wavy than a sheet that has not been embossed.

  The roll body for suppressing the undulation of the solar cell encapsulating sheet and the package body thereof will be described below.

2. 1 is a diagram showing an example of a roll body of the solar cell sealing sheet of the present invention. As FIG. 1 shows, the roll body 10 of a solar cell sealing sheet is the roll body which wound up the solar cell sealing sheet 10a around the core 10b, Comprising: As needed, it is a packaging material (for example, And polyolefin resin such as polyethylene resin and ethylene-α olefin copolymer resin).

  The solar cell sealing sheet 10a is the above-described solar cell sealing sheet. The size of the solar cell encapsulating sheet 10a is appropriately set depending on the size of the solar cell module in which the solar cell encapsulating sheet is used, but the width is 350 mm to 1400 mm, preferably 600 mm to 1250 mm; the length is 60 m. It is -450m, Preferably it is 80m-400m. The roll body 10 has a winding diameter (D) of 1) workability during transport of the roll body (specifically, a weight that can be easily handled by manual work or using a jig), and 2) a packaging container. It may be set as appropriate from the viewpoint of the number of rolls loaded on (pallet) (loading efficiency). The winding diameter (D) of the roll body 10 is preferably 200 mm to 600 mm, and more preferably 250 mm to 550 mm. The winding diameter is the outer diameter of the roll body (including the core).

  The core 10b is a hollow made of paper such as corrugated paper, resin such as polyethylene, polypropylene, and polyvinyl chloride, metal such as aluminum, from the viewpoint of workability and ease of fixing the solar cell encapsulating sheet. A cylindrical body (tubular body), preferably a hollow cylindrical body (tubular body) made of paper or resin. The end of the core 10b may be reinforced by fitting an iron pipe or the like as necessary. The inner diameter of the winding core 10b is preferably 75 mm to 155 mm (3 to 6 inches). If the inner diameter of the core 10b is smaller than 75 mm, the strength of the core 10b is not sufficient and it is difficult to stably support the roll body. On the other hand, when the inner diameter of the winding core 10b exceeds 155 mm, the transport efficiency of the roll body decreases.

  The wall thickness of the winding core 10b is preferably 4 to 15 mm. When the thickness of the core 10b is less than 4 mm, when the solar cell sealing sheet 10a is wound up and left for a long period of time, the core 10b is easily bent due to the weight of the solar cell sealing sheet 10a. Wrinkles may occur in the sheet 10a. On the other hand, when the thickness of the winding core 10b is too thick, workability is deteriorated.

  The length of the core 10b is formed longer than the width of the solar cell encapsulating sheet 10a. The amount of protrusion (l) of the core 10b from at least one end in the sheet width direction is preferably about 2 mm to 15 mm, and more preferably 2 mm to 10 mm.

  That is, the roll body 10 of the solar cell encapsulating sheet is supported in a vertically placed state by a support member (having a recess) disposed on the bottom surface in the packaging container, as will be described later. For this reason, when the amount of protrusion of the core 10b is less than 2 mm, it is difficult to fix the core 10b with the support member. If the overhang amount of the core 10b exceeds 15 mm, not only the sheet width direction end of the roll body 10 is likely to be lifted (not in contact) from the surface of the support member, but also the roll body 10 is difficult to take out from the packaging container. The amount of protrusion of the other core 10b may be set as appropriate in consideration of workability at the time of taking out from the packing container, and may not necessarily be the same as the amount of protrusion of the one core 10b.

3. Packing body of solar cell sealing sheet The packing body of the solar cell sealing sheet of this invention is demonstrated referring a figure. FIG. 2 is an exploded perspective view showing an example of a package of solar cell encapsulating sheets. As shown in FIG. 2, the packaging body 20 of the present invention is arranged on a plurality of solar cell encapsulating sheet roll bodies 10, a packaging container 22 that houses the plurality of roll bodies 10, and a bottom surface in the packaging container 22. And a support member 24 that supports the roll body 10.

  The roll body 10 of the solar cell encapsulating sheet is the roll body 10 of the solar cell encapsulating sheet described above. The number of filling and the filling method of the roll body 10 are not particularly limited, and for example, 5 × 5 (25 filling), 4 from the viewpoint of stability against vibration and loading efficiency on the packing container 22 (pallet 22A). X 4 (16 filled), 3 x 3 (9 filled), 2 x 2 (4 filled), etc., preferably 3 x 3 as shown in FIG. It is preferable to use a single piece (9 filled).

  The packaging container 22 includes a pallet 22A, a body 22B, and a cover 22C. The pallet 22A is a bottom receiving portion having a fork insertion hole 22a of the forklift. The body 22B is a frame that is disposed on the pallet 22A and surrounds the periphery of the roll body 10, and the cover 22C is a lid that is disposed on the body 22B. The size of the pallet 22A is usually about 110 cm square.

  The material of the packaging container 22 is paper such as resin or cardboard, and is preferably cardboard because it is lightweight and can be reused or recycled.

  The support member 24 is a plate-like member arranged in the pallet 22A, and a plurality of recesses or through-holes (hereinafter also referred to as “recesses 24a etc.”) into which the roll core 10b is fitted are provided on the surface thereof. Is formed. The inner diameter of the concave portion 24a and the like is slightly larger than the outer diameter of the roll core 10b, for example, about 5 mm to 20 mm larger than the outer diameter of the core 10b (5 to 25 of the outer diameter of the roll core 10b). % Increase). The depths of the recesses 24a and the like may be any depth that can accommodate the entire overhanging portion of the core 10b of the roll body 10. The shape of the recess 24a is not limited to a circle, and may be a rectangle having an inscribed circle that is slightly larger than the outer diameter of the core 10b.

  The material of the support member 24 is paper such as cardboard paper; or resin such as foamed polystyrene or foamed polypropylene, and is preferably double cardboard paper from the viewpoint of mechanical strength and workability. The thickness of the support member 24 should just be larger than the depth of the recessed part 24a, Preferably it is 10 mm-20 mm, More preferably, it is 10-15 mm.

  FIG. 3 is a side view showing an example of the support structure of the roll body 10. As shown in FIG. 3, the roll body 10 has the core 10 b fitted in the recess 24 a of the support member 24, and the end in the width direction of the solar cell encapsulating sheet 10 a is the surface of the support member 24. It touches.

  The support member 24 is preferably integrated with the pallet 22A. The method for integrating the support member 24 with the pallet 22A is not particularly limited, but any engagement means may be provided between the support member 24 and the pallet 22A, and the support member 24 may be provided in the pallet 22A without a gap. May be laid down. For example, the gap (g) between the end surface of the support member 24 and the inner surface of the pallet 22A is preferably 20 mm or less, more preferably 10 mm or less, and particularly preferably zero.

  In order to reduce the gap (g) between the support member 24 and the pallet 22A as described above, the size of the support member 24 is preferably increased in accordance with the size of the pallet 22A. Thereby, not only the support member 24 and the pallet 22A can be integrated, but also the outer peripheral portion of the roll body 10 does not protrude beyond the outer peripheral portion of the support member 24; the entire lower end surface of the roll body 10 is supported by the support member. 24 surfaces can be contacted.

  The support member 24 may be disposed only on the bottom surface of the pallet 22A, but may be disposed further inside the cover 22C in terms of supporting the roll body 10 more stably.

  With such a configuration, the roll core 10 b is supported by the recess 24 a of the support member 24, and the end in the width direction of the solar cell sealing sheet 10 a is placed on the surface of the support member 24. Is done. Thereby, even if there is little protrusion amount (l) of the core 10b from the width direction edge part of the solar cell sealing sheet 10a, it can support stably with the support member 24. FIG. Thereby, the vibration of the roll body 10 and the vibration of the packaging container 22 can be synchronized via the support member 24 integrated with the packaging container 22. Thereby, the stress by the collision with the packing container 22 of the roll body 10 in a conveyance process can be decreased, and the wavy of the solar cell sealing sheet 10a can be suppressed. Further, since the amount of overhang of the core 10b is small, it can be easily taken out from the support member 24.

  Further, the support member 24 and the packaging container 22 can be more integrated by spreading the support member 24 in the pallet 22A without any gap. For this reason, even if vibration is applied to the packaging container 22, the vibration of the roll body 10 can be integrated (synchronized) with the vibration of the packaging container 22 via the support member 24. Further, in order to eliminate the gap (g) between the support member 24 and the pallet 22A, the gap (g) between the end surface of the support member 24 and the inner surface of the pallet 22A is set to 20 mm or less. For this reason, the outer peripheral part of the roll body 10 does not protrude outside the outer peripheral part of the support member 24. For this reason, since the whole lower end surface of the roll body 10 is in contact with the surface of the support member 24, the roll body 10 can be stably fixed, and the shaking of the roll body 10 can be reduced. Thereby, the stress by the collision with the packing container 22 of the roll body 10 in a conveyance process can be decreased, and the wavy of the roll body 10 can be suppressed effectively.

  In the present invention, in order to eliminate “asynchronism between the packing container and the roll body”, the support structure of the roll body is not only the above-described structure, but also 2) the gap between the roll body and the packing container. It is also effective to reduce.

  Means for reducing the gap between the roll body and the packaging container include: filling the roll body into the packaging container with high density; providing a partition member for partitioning between the plurality of roll bodies, The contact area may be increased.

  FIG. 4 is an exploded perspective view showing another example of the packing body of the present invention. As shown in FIG. 4, the packaging body 20 ′ has substantially the same configuration as FIG. 1 except that the packaging body 20 ′ further includes a partition member 26 that partitions the plurality of roll bodies 10 and a binding member 28 that bundles the plurality of roll bodies 10. Has been.

  The material of the partition member 26 is not particularly limited, but is the same as that of the support member 24 described above, for example, paper such as corrugated paper or resin such as foamed polystyrene or foamed polypropylene, and preferably corrugated paper. The thickness of the partition member 26 should just be a grade which can maintain a shape, even if the roll body 10 contacts, for example, is 10 mm-20 mm, More preferably, it is 10-15 mm. The height (h) of the partition member 26 is preferably equal to or greater than the width of the solar cell encapsulating sheet 10 a of the roll body 10.

  FIG. 5 is a view of the arrangement of the roll bodies in the packaging container 22 as viewed from above. In the figure, description of other members is omitted. As shown in FIG. 5, the total of the winding diameters (D) of the three roll bodies 10 arranged along any one inner surface of the pallet 22A is the same as the length of the inner surface. However, it may be slightly shorter than that. However, it adjusts suitably so that the roll bodies 10 may be pressed against each other and damaged. In this way, by reducing the gap between the inner surface of the packaging container 22 and the roll body 10, the packaging container 22 and the roll body 10 can be easily synchronized.

  The binding member 28 is a packaging film such as a linear low density polyethylene (LLDPE) additive-free stretch film or a binding band, and is preferably a packaging film. A stretch film containing an additive such as a slip agent, a stretch film made of vinyl chloride, and the like are not preferable from the viewpoint of maintaining the quality of the solar cell encapsulating sheet. The binding member 28 encloses the plurality of roll bodies 10 and is wound around the plurality of roll bodies 10 so as to form one bundle.

  In this way, by further providing the partition member 26 between the plurality of roll bodies 10, when the packaging container 22 is vibrated, the roll body 10 is integrated with the packaging container 22 instead of the other roll bodies. The separated partition member 26 can be brought into contact. For this reason, the vibration of the roll body 10 can be integrated (synchronized) with the vibration of the packaging container 22 via the partition member 26, and the stress due to the collision of the roll body 10 with the packaging container 22 can be reduced. Can do.

  Furthermore, the roll bodies can be integrated by bundling the plurality of roll bodies 10 with the binding member 28. For this reason, the stress by the collision of roll bodies can be decreased and the waviness of the roll body 10 can be suppressed effectively.

  In the following, the present invention will be described in more detail with reference to examples. The scope of the invention should not be construed as limited by these examples.

Example 1
Preparation of roll body A solar cell encapsulating sheet (SOLAR EVA ^™ RC02B-45T, sheet thickness 640 μm, embossed depth of about 0.3 mm) having a width of 986 mm and a length of 140 m is wound around a winding core, and the winding diameter is 35 A roll body of 5 cm was prepared. The core is made of paper with an outer diameter of 85 mmφ and an inner diameter of 75 mmφ, and the amount of the lower core (from the sheet width direction end) is set to 2 to 3 mm, and the upper core (sheet width direction end) The overhang amount (from the part) was set to 15 to 20 mm. Nine of these rolls were prepared by packaging them in plastic bags.

Preparation of Package A pallet made of double corrugated paper having a length of 1110 mm, a width of 1110 mm, and a height of 250 mm (leg portion: 100 mm) was prepared. In the pallet, as shown in FIG. 6, a supporting member made of double-layer corrugated paper having a length of 1090 mm, a width of 1090 mm, and a thickness of 15 mm was laid. The inner diameter of the recess of the support member was 95 mmφ, the depth of the recess was 10 mm, and the gap between the recess and the recess was 260 mm (in FIG. 6, the outer diameter of the roll body 10 is indicated by a dotted line). The gap (g) between the end surface of the support member and the inner surface of the pallet was about 5 mm. Next, the roll body was fixed by fitting the roll core into the recess on the surface of the support member. Then, as shown in FIG. 1, the body made of double corrugated paper (vertical 1090 mm × horizontal 1090 mm × height 103 mm) and cover (vertical 1130 mm × horizontal 1130 mm) are placed on a pallet on which nine roll bodies are fixed. X 160 mm in height) and then fixed with a string to obtain a package.

(Example 2)
Preparation of roll body A solar cell encapsulating sheet (SOLA EVA ^™ SC52B-40T, sheet thickness 560 μm, emboss depth of about 0.3 mm) having a width of 1000 mm and a length of 160 m is wound around a winding core, and the winding diameter is 35 A roll body of 5 mm was prepared.

Production of packing body Except that the support member (cardboard) is laid in the pallet so that the gap (g) between the end surface of the support member and the inner surface of the pallet is 0 mm, and a partition member for partitioning the roll bodies is arranged. A package was obtained in the same manner as in Example 1. As the partition member, as shown in FIG. 4, cardboard paper having a length of 1070 mm × height (h) 1000 mm × thickness 10 mm intersected in a grid pattern two by two was used.

(Comparative Example 1)
A solar cell encapsulating sheet (SOLAR EVA ^™ SC52B-40T) having a width of 981 mm and a length of 160 m is wound around a winding core to form a roll body with a winding diameter of 35.5 cm, and the amount of protrusion of the lower winding core is zero. And the roll body was prepared like Example 1 except the clearance gap (g) of the end surface of a supporting member and the inner surface of a pallet having been about 25 mm, respectively. A package was obtained in the same manner as in Example 1 except that these rolls were placed on a flat plate member having no recess.

Random vibrations based on ASTM D 4169-05 using the i250 / SA5M manufactured by IMV Co., Ltd., assuming the land transportation by truck for the packages obtained in Examples 1-2 and Comparative Example 1. A test was conducted. Vibration was applied from the bottom side of the package. Table 1 shows conditions such as vibration intensity added.

Then, the total number of undulations of the roll body after applying the vibration was counted. As shown in FIG. 7, the roll body was measured by measuring the laminated thickness (wave depth: d) of the sheet in which the roll body was wavy, and evaluating it according to the following criteria.
Wave depth d is 5 mm or more: Wave is found Wave depth d is less than 5 mm: No wave

Furthermore, for Example 1 and Comparative Example 1, the average value of the undulation depth d of the three roll bodies after application of vibration (three roll bodies arranged along one arbitrary inner surface of the packaging container) is calculated. Asked. These results are shown in Table 2.

  In the package of Example 1, it can be seen that the number of undulations caused by vibration is smaller than that of the package of Comparative Example 1. In the package of Example 2, although some slack occurred, no waviness occurred. It can also be seen that the roll body of Example 1 has a smaller undulation depth than the roll body of Comparative Example 1.

  According to the present invention, by reducing the stress applied to the roll body by vibration, it is possible to suppress the undulation of the solar cell encapsulating sheet and further facilitate the removal of the roll body from the packaging container.

DESCRIPTION OF SYMBOLS 10 Roll body 10a Solar cell sealing sheet 10b Core 20, 20 'Packing body 22 Packing container 22A Pallet 22B Body 22C Cover 22a Forklift insertion hole 24 Support member 24a Recessed part 26 Partition member 28 Binding member

Claims (11)

A roll body having a winding core and a solar cell encapsulating sheet wound around the circumferential surface of the winding core,
An emboss is formed on the surface of the solar cell encapsulating sheet,
The solar cell encapsulating sheet has a width of 350 to 1400 mm,
The roll body of the solar cell encapsulating sheet, wherein the roll body has a winding diameter of 200 to 600 mm, and the amount of protrusion of the core from the end in the width direction of the solar cell encapsulating sheet is 2 mm to 15 mm. . In the thickness direction of the solar cell encapsulating sheet,
The roll body of Claim 1 whose depth of the said embossing is 5-90% with respect to the maximum thickness of the said solar cell sealing sheet. The core is a tube,
The roll body according to claim 1 or 2, wherein the core has an inner diameter of 75 mm to 155 mm and a wall thickness of 4 to 15 mm.   The roll body according to any one of claims 1 to 3, wherein a material of the winding core is paper or resin. The solar cell encapsulating sheet is
A resin selected from the group consisting of an ethylene copolymer, a modified polyethylene resin, and polyvinyl butyral,
The roll body as described in any one of Claims 1-4 containing resin whose melt flow rate (MFR) is 0.1-100 g / 10min.   The roll body according to claim 5, wherein the ethylene copolymer is an ethylene-vinyl acetate copolymer. A plurality of roll bodies according to any one of claims 1 to 6;
A packaging container containing the plurality of roll bodies;
A support member that is disposed on the bottom surface in the packing container and has a plurality of recesses or through-holes into which the roll core is fitted;
A package for a solar cell encapsulating sheet, wherein a roll core of the roll body is supported by a recess or a through hole of the support member, and an end in a width direction of the roll body is in contact with the surface of the support member.   The package body of the solar cell sealing sheet according to claim 7, wherein a depth of the concave portion or the through hole of the support member is larger than a protruding amount of the core of the roll body.   The package of the solar cell sealing sheet of Claim 7 or 8 whose clearance gap between the end surface of the said supporting member and the inner surface of the said packaging container is 20 mm or less.   The packaging body of the solar cell sealing sheet as described in any one of Claims 7-9 which further has a partition member which partitions off between these several roll bodies. The packaging of the solar cell sealing sheet as described in any one of Claims 7-10 which has further a binding member wound so that the said several roll body may be included, and makes the said several roll body into one bundle. body.

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