JP2013209140A - Package for solar battery sealing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package for a solar battery sealing sheet capable of suppressing the wrinkling and waviness of a roll of the solar battery sealing sheet caused by a shake or the like of the roll during transportation, and facilitating the removal of the roll from a package container.SOLUTION: A package 20 for a solar battery sealing sheet includes a plurality of rolls 10 having hollow cores and solar battery sealing sheets wound on circumferential surfaces of the cores; a package container housing the plurality of rolls and composed of a pallet 22A, a bottom face cover 22B, a body 22C, and a top face cover 22D; and a support member 24 formed with a plurality of protrusions provided on the bottom face cover of the package container and supporting the cores. The protrusions of the support member are engaged in the cores, and a core inner diameter (ID) and a protrusion height (H) of the support member have a relationship of 0.2<[H/ID]<1.

Description

  The present invention relates to a package for a solar cell sealing sheet.

Films and sheet products are generally used for transportation and use by using a core and winding it into a roll. Therefore, a means for transporting the roll easily and stably is required.
In particular, the solar cell encapsulating sheet is a soft material, and is easily deformed by shaking during transportation, and has a risk of deteriorating the appearance and reducing the commercial value.
In Patent Document 1, a base made of a synthetic resin having engaging means for fitting a lower end of a roll body into a base on which a roll body receiving recess is formed, and an upper end of the roll body engages with a core end of the roll body. A roll body packing method using a plate has been proposed.
In Patent Document 2, a solar cell encapsulating sheet having specific dimensions and an embossed structure is wound with a width shorter than that of the core, and a roll body in which the core protrudes from the roll is provided inside the packaging container. By inserting the core of the roll body into the recess or the through hole of the support member having the recess or the through hole arranged on the bottom surface of the roll body and bringing the end in the width direction of the roll body into contact with the surface of the support member, A technique for suppressing the undulation of the solar cell encapsulating sheet due to “asynchronism between container vibration and roll body vibration” and a technique for improving the suppression by using a partition member have been proposed.

Japanese Patent Laid-Open No. 5-201485 JP 2011-230808 A

However, in Patent Document 1, it is necessary to manufacture a base in which a receiving recess according to a predetermined roll body outer diameter is formed. Therefore, when the number of roll bodies to be stored or the diameter of the roll body is changed, a new base is formed. This requires a period and cost for mold production. Further, since a synthetic resin top plate is used, it is heavy and expensive.
In patent document 2, it is supposed that the winding core of the overhanging roll body is fitted into a recess or a through-hole, and the wave structure of the solar cell encapsulating sheet is suppressed by adopting a support structure that integrates the packaging container and the roll body. However, it is clear that the effect of suppressing the undulation of the solar cell encapsulating sheet (roll body) cannot be exhibited unless the partition member is used. Therefore, the number of members required for packing increases, and the number of processes increases during packing and unpacking.

  In view of such circumstances, the present invention is a packing body in which a roll body is packed by a simpler and less costly packing method, and the roll body of a solar cell encapsulating sheet caused by shaking of the roll body during transportation or the like An object of the present invention is to provide a solar cell encapsulating sheet packaging body that can suppress undulations and that allows easy removal of the roll body from the packaging container.

  As a result of intensive studies, the inventors have arranged a support member on which a plurality of convex portions for supporting the hollow core are formed on the bottom cover of the packaging container, the inner diameter of the core and the height of the convex portion of the support member. By engaging the hollow core having a specific relationship with the convex portion of the support member, a support structure in which the packaging container and the roll body are well integrated is realized, and the roll body is shaken during transportation. The present invention was completed by discovering that a solar cell encapsulating sheet packaging body can be obtained that can suppress wrinkles and undulations of the resulting solar cell encapsulating sheet and that can be easily taken out of the roll body from the packaging container. .

That is, the present invention relates to the following [1] to [4].
[1] A plurality of roll bodies having a hollow core and a solar cell encapsulating sheet wound on the peripheral surface of the core, and a pallet, a bottom cover, and a body for storing the plurality of roll bodies And a support member formed on the bottom cover of the packing container and formed with a plurality of convex portions for supporting the core, and the support in the core For solar cells in which the convex portions of the member are engaged and the inner diameter (ID) of the core and the convex portion height (H) of the support member are in a relationship of 0.2 <[H / ID] <1 Package of sealing sheet.
[2] The package according to [1] above, wherein an amount of the core protruding from the end in the width direction of the solar cell sealing sheet is 0 mm to 15 mm.
[3] The package according to [1] or [2], wherein the support member is formed by fitting a convex support having a through hole and a flange portion formed in the plate-like member.
[4] The package according to any one of [1] to [3], further including a support member in which a plurality of convex portions that support the core is formed inside the top cover.

  According to the present invention, the packing container and the roll body are well integrated by engaging the hollow core having a specific relationship between the inner diameter of the core and the height of the convex portion and the convex portion of the bottom support member. Solar cell encapsulating sheet that realizes support structure, can suppress wrinkles and undulations of solar cell encapsulating sheet caused by swaying roll body during transportation, and can easily take out roll body from packing container Can be obtained.

It is a schematic diagram which shows an example of the roll body of the sealing sheet for solar cells. It is a disassembled perspective view which shows an example of the preparation methods of the package body of the sealing sheet for solar cells. It is a disassembled perspective view which shows an example of the package body of the sealing sheet for solar cells. It is a perspective view which shows an example of the package body of the sealing sheet for solar cells. It is the figure which looked at an example of the arrangement | positioning state of the roll body in a packaging container from the top. It is the figure which looked at an example of the arrangement | positioning state of the roll body in a packaging container from the top. It is sectional drawing which shows an example of the support state of a roll body. It is sectional drawing which shows an example of the support state of a roll body. It is a side view which shows an example of the relationship between the core inner diameter of a roll body, and a supporting member. It is a disassembled perspective view which shows an example of a supporting member. It is the figure which looked at an example of the arrangement | positioning state of the package in a container from the top. It is a side view of an example of the arrangement | positioning state of the package in a container.

The packaging body of the solar cell encapsulating sheet of the present invention includes a plurality of roll bodies having a hollow core and a solar cell encapsulating sheet wound on the peripheral surface of the core, and a plurality of roll bodies. A support member formed with a plurality of protrusions for supporting the core is provided on the bottom surface of the packing container, the protrusions of the support member are engaged in the core, and the inner diameter of the core (ID) and the convex part height (H) of a supporting member have the relationship of 0.2 <[H / ID] <1.
Hereinafter, the present invention will be described in detail.

[Roll body]
FIG. 1 is a diagram showing an example of a roll body of the solar cell encapsulating sheet of the present invention. The roll body 10 of the solar cell encapsulating sheet is a roll body in which the solar cell encapsulating sheet 10a is wound around the winding core 10b, and a packaging material (for example, a polyethylene film, a polyester film, aluminum, or the like). It may be packaged with a vapor deposition film or the like.

  The solar cell sealing sheet 10a is obtained by forming a solar cell sealing material, which will be described later, into a film. 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. The thickness is preferably 30 μm to 1000 μm (1 mm). The width (L) is preferably 350 mm to 1400 mm, more preferably 600 mm to 1250 mm. Here, the width of the sealing sheet varies depending on the size of the solar cell module, etc., but the module has become larger with the increase in efficiency of the solar cell module. A width of about 1100 mm has been widely used. The length varies depending on the thickness, but is 50 m to 1000 m, preferably 100 m to 500 m. The winding diameter (D) of the roll body 10 is the workability at the time of transporting the roll body (the weight should be easy to handle by hand or using a jig) and the loading of the roll body on the packaging container (pallet) What is necessary is just to set suitably from viewpoints, such as a number (loading efficiency). The winding diameter (D) of the roll body 10 is 200 mm to 600 mm, preferably 250 mm to 550 mm. The winding diameter is the outer diameter of the roll body (including the core).

  The winding core 10b is a hollow cylindrical body (tubular body). The material is appropriately selected from the viewpoint of workability and ease of fixing the solar cell sealing material, but paper such as corrugated paper, resin such as polyethylene, polypropylene and polyvinyl chloride, and metal such as aluminum Is used. Paper is preferably used because of its industrial availability, but aluminum foil is laminated from the viewpoint of moisture resistance (so that moisture does not enter the solar cell encapsulant from the core). Paper is also preferably used. The end of the core 10b may be reinforced by fitting an iron pipe or the like as necessary. The inner diameter (ID) of the winding core 10b is 70 mm to 160 mm (3 to 6 inches). When the inner diameter of the core 10b is smaller than 70 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 160 mm, the conveyance efficiency of the roll body decreases.

  The wall thickness of the winding core 10b is preferably 4 to 20 mm, and particularly preferably 8 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 the same as the width of the solar cell encapsulating sheet 10a or longer than that. According to the present invention, since the convex portion of the bottom support member is engaged with the inside of the core, the amount of protrusion (CL1) of the core from the bottom side sealing sheet width direction end is 0 mm. There will be no shaking during transportation. Furthermore, if it is 2 mm or more, since a sealing sheet and a bottom part supporting member do not contact, it is hard to produce appearance defects, such as a roll body breaking, and it is preferable. Moreover, if it is 15 mm or less, since the height of a package becomes large too much and it does not reduce loading efficiency, it is preferable. The overhang amount (CL2) of the core on the top surface side of the packaging container may be set as appropriate in consideration of the workability when taking out from the inside of the packaging container, and is not necessarily limited to the core from the width direction end on the bottom surface side. The amount of overhang (CL1) may not be the same.

[Packaging body]
The package of the solar cell encapsulating sheet of the present invention will be described with reference to the drawings. 2 and 3 are exploded perspective views showing an example of manufacturing a package of solar cell encapsulating sheets, and FIG. 4 is a perspective view of the package. The packaging body 20 of the present invention includes a roll body 10 of a plurality of solar cell encapsulating sheets, a packaging container 22 that houses the plurality of roll bodies 10, and a support that supports the roll body 10 that is disposed on the bottom surface in the packaging container 22. Member 24.

  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 that the number is 9 (filled 9) or 2 × 2 (filled 4) as shown in FIG.

The packaging container 22 includes a pallet 22A, a bottom cover 22B, a body 22C, and a top cover 22D, and a support member 24 on which a plurality of convex portions that support the core is formed is disposed on the bottom cover 22B. The pallet 22A is a bottom receiving portion having a fork insertion hole 22a of the forklift. The bottom cover 22B is a lid that is disposed on the pallet 22A and holds the support member 24 so that it does not move. The body 22C is a frame that is disposed on the bottom cover 22B and surrounds the roll body 10. The top cover 22D is a lid disposed on the body 22C.
The bottom cover 22B and the top cover 22D may be formed in a lid shape in advance, or may be formed in a lid shape by folding a flat edged cover.
Further, the body 22C may be formed in a cylindrical shape in advance, or may be formed in a cylindrical shape by folding a flat surface of four surfaces, or a continuous surface of two surfaces. Two sheets may be combined to form a cylinder. From the viewpoint of workability, storage of members, and the like, it is preferable that the two or four surfaces are formed in a flat shape.

An example of a method for producing a package in the case of using a packaging container of a type that is formed into a lid by folding a flat edged mount will be described with reference to FIGS.
A flat edged bottom cover 22B is installed on the pallet 22A, and a support member 24 is installed thereon. The convex portion 24a of the support member 24 is engaged and fixed inside the winding core 10b of the roll body 10. Next, the body 22C formed in two pieces is placed on the bottom cover 22B and combined to form a cylinder. A flat top cover 22D with a flat edge is disposed on the body 22C, and the bottom cover 22B and the top cover 22D are folded to form a lid. Finally, the fork insertion hole 22a of the pallet 22A and the top cover 22D are bound by a binding band 26 made of polypropylene or the like and integrated.

  The material of the packaging container 22 is wood, resin, paper such as corrugated paper or compressed paper, and is preferably corrugated paper because it is lightweight, reusable or recyclable, and easy to process. The thickness of the corrugated cardboard may be appropriately selected depending on the weight of the contents, but is preferably 5 mm to 15 mm. Also, these may all be the same material, for example, different materials such as only the pallet 22A made of wood and the other made of corrugated paper may be used.

  The support member 24 may be disposed only on the bottom surface of the bottom cover 22A. However, the support member 24 may also be disposed on the inner side of the top cover 22D in terms of supporting the roll body 10 more stably.

  With such a configuration, as shown in FIGS. 7 and 8, the convex portion 24a of the support member 24 is engaged with the inside of the roll core 10b of the roll body. Thereby, the roll body 10 can be stably supported by the support member 24, and the vibration of the roll body 10 and the vibration of the packaging container 22 can be synchronized. 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 material 10a can be suppressed. In addition, the height of the package can be reduced without requiring the amount of overhang of the core 10b.

(Support member)
The support member 24 is a plate-like member disposed on the bottom cover 22B, and has a plurality of convex portions (hereinafter also referred to as “convex portions 24a”) that are engaged in the roll core 10b of the roll body. ) Is formed. As shown in FIG. 9, the outer diameter of the protrusion 24a is slightly smaller than the inner diameter (ID) of the roll core 10b, for example, about 1 mm to 5 mm smaller than the inner diameter (ID) of the core 10b. Good.
It is important that the height (H) of the convex portion 24a is in a relationship of 0.2 <[H / ID] <1 with respect to the core inner diameter (ID). If it is larger than 0.2, the convex portion can stably support the core, and therefore deformation of the roll body due to shaking during transportation can be suppressed, which is preferable. If it is smaller than 1.0, workability is not impaired, which is preferable.
The shape of the convex portion 24a is not limited to a cylindrical shape, and may be a triangular, square, or polygonal prismatic shape with a circle slightly smaller than the inner diameter of the core 10b as a circumscribed circle.

The formation method of the convex part 24a in the support member 24 is not particularly limited. The plate-like member 24 may be press-molded to integrally form the convex portion 24a, or after the through-hole 24b is formed in the plate-like member 24 as shown in FIG. 10, the “convex support tool 24c having a flange portion”. May be formed by fitting. From the point that it can be easily adjusted to various sizes, the method of fitting the convex support 24c having the flange portion after the through-hole 24b is formed in the plate-like member is preferable.
The material of the support member 24 is wood, resin, paper such as corrugated cardboard or compressed paper, and is preferably compressed paper because it is lightweight, reusable or recyclable, and easy to process. The preferred thickness may be appropriately selected depending on the weight of the contents, etc., but preferably 1 mm to 15 mm when wood or resin is used, and 5 mm to 15 mm when cardboard paper or compressed paper is used. These may all be made of the same material. For example, the convex support 24c may be made of plastic such as polyethylene or polypropylene, and the plate member 24 may be made of corrugated paper. Absent.

(Package size)
A plurality of packages are loaded in containers and transported via land (trucks, trains), sea, and air. Here, the loading efficiency to the container is important from an economic point of view.
Commonly used containers are a 20-foot container (inner diameter: 5926 mm, width 2349 mm, height 2382 mm), 40-foot container (inner diameter: height 12052 mm, width 2349 mm, height 2382 mm), 40-foot tall container (inner diameter : 12052 mm in length, 2349 mm in width, and 2689 m in height).
If the packing body can be efficiently loaded, the size of the packing body 20 is not particularly limited. However, from the viewpoint of workability and the like, the vertical and horizontal lengths are each preferably within 2000 mm, and a rectangular shape or a square shape is preferable. The height is preferably within 1800 mm. FIG. 11 shows an example of an arrangement state in a 40-foot container. 2 × 10 (20) packages having a size of 1140 mm in length and 1140 mm in width can be stacked in the plane direction. Moreover, an example of the arrangement | positioning state to a 40-foot tall container is shown in FIG. The package can normally be loaded to a height of about 2550 mm with respect to the height of the container of 2689 mm. Therefore, it is preferable that the height of the package is 1275 mm or less because another package can be stacked on top of one package.
According to the present invention, since the shaking can be suppressed without providing the overhang (CL1) in the end surface direction of the core, a package with good loading efficiency can be obtained.

Next, the solar cell sealing material which is the material of the solar cell sealing sheet 10a of the present invention will be described.
[Sealant for solar cell]
The material of the solar cell encapsulating sheet accommodated in the package of the present invention is not particularly limited, but from the viewpoint of industrial availability and flexibility described later, a polyolefin resin (modified polyolefin type) A sealing material made of a resin composition mainly containing a resin) is preferable.
Specific (modified) polyolefin-based resins are exemplified below, but these resins may be used alone or in combination of two or more. Further, the sealing material may be a single layer or a laminate of two or more layers.

<Polyolefin resin>
The type of the polyolefin resin is not particularly limited, but is preferably at least one resin selected from the group consisting of a polyethylene resin, a polypropylene resin, and a cyclic olefin resin.

(Polyethylene resin)
The type of the polyethylene-based resin is not particularly limited, and specifically, ultra-low density polyethylene, low density polyethylene, linear low density polyethylene (ethylene-α-olefin copolymer), medium density polyethylene, Examples thereof include high-density polyethylene and ultrahigh-density polyethylene. Among these, linear low density polyethylene (ethylene-α-olefin copolymer) has low crystallinity and excellent transparency and flexibility, so that it inhibits the power generation characteristics of the solar cell element and causes excessive stress to the solar cell element. In addition, it is preferable because it is difficult to cause problems such as damage.

  The ethylene-α-olefin copolymer may be a random copolymer or a block copolymer. Although it does not specifically limit as a kind of alpha olefin copolymerized with ethylene, Usually, a C3-C20 alpha olefin is used suitably. Examples of the α-olefin copolymerized with ethylene include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, and 3-methyl-butene. -1,4-methyl-pentene-1 and the like. In the present invention, propylene, 1-butene, 1-hexene, and 1-octene are preferably used as the α-olefin copolymerized with ethylene from the viewpoints of industrial availability, various characteristics, and economical efficiency. It is done. The α-olefin copolymerized with ethylene may be used alone or in combination of two or more.

  Further, the content of the α-olefin copolymerized with ethylene is not particularly limited, but is usually 2 mol% or more, preferably 3 mol% or more, more preferably 5 mol% or more, and usually It is 40 mol% or less, preferably 30 mol% or less, more preferably 25 mol% or less. Within this range, transparency is improved by reducing crystallinity due to the copolymerization component, and problems such as blocking of raw material pellets are less likely to occur. In addition, the kind and content of the α-olefin copolymerized with ethylene can be qualitatively and quantitatively analyzed by a well-known method, for example, a nuclear magnetic resonance (NMR) measuring apparatus or other instrumental analyzer.

  The method for producing the polyethylene resin is not particularly limited, and a known polymerization method using a known olefin polymerization catalyst can be employed. For example, a slurry polymerization method, a solution polymerization method, a bulk polymerization method, a gas phase polymerization using a multi-site catalyst typified by a Ziegler-Natta type catalyst, or a single-site catalyst typified by a metallocene catalyst or a post-metallocene catalyst. Examples thereof include a bulk polymerization method using a radical initiator and the like. The ethylene-α-olefin copolymer used as the sealing material is preferably a relatively soft resin, and has a low molecular weight component from the standpoint of ease of granulation after polymerization and prevention of blocking of raw material pellets. A polymerization method using a single site catalyst capable of polymerizing a raw material having a small molecular weight distribution is suitable.

  Specific examples of the polyethylene resin used in the present invention include trade names “Hizex”, “Neozex”, “Ultzex”, and Nippon Polyethylene Co., Ltd. manufactured by Prime Polymer Co., Ltd. Product names “Kernel”, “Novatec HD”, “Novatech LD”, “Novatech LL”, product names “Engage”, “Affinity” manufactured by Dow Chemical Co., Ltd. ) ”“ Infuse ”, trade names“ TAFMER A ”,“ TAFMER P ”manufactured by Mitsui Chemicals, Inc., and the like.

(Polypropylene resin)
The type of the polypropylene resin is not particularly limited, and specific examples include a propylene homopolymer, a propylene copolymer, a reactor type polypropylene thermoplastic elastomer, and a mixture thereof. .
As a copolymer of propylene, a random copolymer of propylene and ethylene or other α-olefin (random polypropylene), a block copolymer (block polypropylene), a block copolymer or a graft copolymer containing a rubber component Etc. The other α-olefin copolymerizable with propylene is preferably one having 4 to 12 carbon atoms, such as 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 4 -Methyl-1-pentene, 1-decene, etc. are mentioned, The 1 type (s) or 2 or more types of mixture is used.

  Further, the content of the α-olefin copolymerized with propylene is not particularly limited, but is usually 2 mol% or more, preferably 3 mol% or more, more preferably 5 mol% or more, and usually It is 40 mol% or less, preferably 30 mol% or less, more preferably 25 mol% or less. Within this range, transparency is improved by reducing crystallinity due to the copolymerization component, and problems such as blocking of raw material pellets are less likely to occur. In addition, the kind and content of the α-olefin copolymerized with propylene can be qualitatively and quantitatively analyzed by a well-known method, for example, a nuclear magnetic resonance (NMR) measuring device or other instrumental analyzer.

  The method for producing the polypropylene resin is not particularly limited, and a known polymerization method using a known olefin polymerization catalyst can be employed. For example, a slurry polymerization method, a solution polymerization method, a bulk polymerization method, a gas phase polymerization using a multi-site catalyst typified by a Ziegler-Natta type catalyst, or a single-site catalyst typified by a metallocene catalyst or a post-metallocene catalyst. Examples thereof include a bulk polymerization method using a radical initiator and the like. The propylene-α-olefin copolymer used as the sealing material is preferably a relatively soft resin, and has a low molecular weight component from the viewpoint of ease of granulation after polymerization and prevention of blocking of raw material pellets. A polymerization method using a single site catalyst capable of polymerizing a raw material having a small molecular weight distribution is suitable.

  Specific examples of the polypropylene resin used in the present invention include trade names “NOVATEC-PP”, “WINTECH”, and product names of Prime Polymer Co., Ltd., manufactured by Nippon Polypro Co., Ltd. Examples thereof include “PRIME-POLYPRO”, “PRIME-TPO”, and trade name “NORBREN” manufactured by Sumitomo Chemical Co., Ltd.

(Cyclic olefin resin)
The type of the cyclic olefin-based resin is not particularly limited, and specifically, a cyclic olefin polymer obtained by ring-opening polymerization of one or more cyclic olefins, a hydride thereof, and a linear chain. Examples thereof include block copolymers of α-olefins and cyclic olefins, and random copolymers of linear α-olefins and cyclic olefins.

  The type of cyclic olefin constituting the cyclic olefin-based resin is not particularly limited, but bicyclohept-2-ene (2-norbornene) and derivatives thereof such as norbornene, 6-methylnorbornene, and 6-ethylnorbornene. 6-n-butylnorbornene, 5-propylnorbornene, 1-methylnorbornene, 7-methylnorbornene, 5,6-dimethylnorbornene, 5-phenylnorbornene, 5-benzylnorbornene, tetracyclo-3-dodecene and derivatives thereof For example, 8-methyltetracyclo-3-dodecene, 8-ethyltetracyclo-3-dodecene, 8-hexyltetracyclo-3-dodecene, 10-dimethyltetracyclo-3-dodecene, 5,10-dimethyltetra Cyclo-3-dodecene, etc. It is exemplified. In the present invention, norbornene, tetracyclododecene, and the like are preferably used from the viewpoints of industrial availability, various characteristics, economy, and the like.

  Although it does not specifically limit as a kind of linear alpha olefin copolymerized with the said cyclic olefin, Usually, a C2-C20 linear alpha olefin is used suitably. Examples of the linear α-olefin copolymerized with the cyclic olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene and 1-decene. Etc. are exemplified. In the present invention, ethylene is preferably used as the linear α-olefin copolymerized with the cyclic olefin from the viewpoints of industrial availability, various characteristics, economy, and the like. The linear α-olefin copolymerized with the cyclic olefin may be used alone or in combination of two or more.

  Further, the content of the cyclic olefin copolymerized with the linear α-olefin is not particularly limited, but is usually 5 mol% or more, preferably 10 mol% or more, more preferably 20 mol% or more. And, it is usually 70 mol% or less, preferably 60 mol% or less, more preferably 50 mol% or less. When the content of the cyclic olefin is increased, the heat resistance, the barrier property and the transparency can be improved, and when the content is decreased, the flexibility is improved, which is preferable. If the content of the cyclic olefin is within this range, it is preferable because the crystallinity is reduced by the copolymer component, transparency is exhibited, and problems such as blocking of raw material pellets are not likely to occur. In addition, the kind and content of the cyclic olefin copolymerized with the linear α-olefin can be qualitatively and quantitatively analyzed by a well-known method, for example, a nuclear magnetic resonance (NMR) measuring device or other instrumental analyzer.

  The cyclic olefin resins used in the present invention are, for example, JP-A-60-168708, JP-A-612012016, JP-A-61-115912, JP-A-61-115916, Manufactured according to known methods described in JP-A-61-271308, JP-A-61-272216, JP-A-62-252406, JP-A-62-2252407, etc. Can do.

  Specific examples of the cyclic olefin resin used in the present invention include trade name “APEL” manufactured by Mitsui Chemicals, Inc., trade name “TOPAS” manufactured by Topas Advanced Polymers, Japan, Examples include trade names “ZEONOR” and “ZEONEX” manufactured by ZEON Corporation.

<Modified polyolefin resin>
The type of the modified polyolefin resin is not particularly limited, but EVA (ethylene-vinyl acetate copolymer), EVOH (ethylene-vinyl alcohol copolymer), E-MMA (ethylene-methyl methacrylate copolymer). Coalescence), E-EAA (ethylene-ethyl acrylate copolymer), E-GMA (ethylene-glycidyl methacrylate copolymer), ionomer resin (ionic crosslinkable ethylene-methacrylic acid copolymer, ion crosslinkable ethylene-acrylic) An acid copolymer), a silane crosslinkable polyolefin, and a maleic anhydride graft copolymer are preferable.

  The content of various monomers that modify the modified polyolefin resin is not particularly limited, but is usually 0.5 mol% or more, preferably 1 mol% or more, more preferably 2 mol% or more. And, it is usually 40 mol% or less, preferably 30 mol% or less, more preferably 25 mol% or less. Within this range, transparency is improved by reducing crystallinity due to the copolymerization component, and problems such as blocking of raw material pellets are less likely to occur. The types and contents of various monomers that modify the modified polyolefin resin can be qualitatively and quantitatively analyzed by a known method, for example, a nuclear magnetic resonance (NMR) measuring device or other instrumental analyzer.

  The production method of the modified polyolefin resin used in the present invention is not particularly limited, and a known olefin polymerization catalyst is used except for the ionomer resin, silane crosslinkable polyolefin, and maleic anhydride graft copolymer shown below. Known polymerization methods such as slurry polymerization method, solution polymerization method, bulk polymerization method, gas phase polymerization method using multi-site catalyst typified by Ziegler-Natta type catalyst and single-site catalyst typified by metallocene catalyst, etc. Moreover, the block polymerization method using a radical initiator, etc. are mentioned.

  The ionomer resin contains at least a part of an unsaturated carboxylic acid component of a copolymer comprising ethylene, an unsaturated carboxylic acid, and other unsaturated compounds as optional components, at least one of a metal ion and an organic amine. It can be obtained by summing. The ionomer resin can also be obtained by saponifying at least a part of an unsaturated carboxylic acid ester component of a copolymer comprising ethylene, an unsaturated carboxylic acid ester, and other unsaturated compounds as optional components. .

  The silane crosslinkable polyolefin can be obtained by melt-mixing a polyolefin-based resin, a silane coupling agent described later, and a radical generator at a high temperature and graft polymerization.

  The maleic anhydride graft copolymer can be obtained by melt-mixing a polyolefin resin, maleic anhydride, and a radical generator at a high temperature and graft polymerization.

  Specific examples of the modified polyolefin resin used in the present invention include EVA (ethylene-vinyl acetate copolymer), trade name “Novatech EVA (NOVATECH-EVA)” manufactured by Nippon Polyethylene Co., Ltd., Mitsui DuPont. The product name “EVAFLEX” manufactured by Polychemical Co., Ltd., “NUC” series manufactured by Nihon Unicar Co., Ltd., and EVOH (ethylene-vinyl alcohol copolymer) products manufactured by Nippon Synthetic Chemical Co., Ltd. The name “SOARNOL”, the product name “EVAL” manufactured by Kuraray Co., Ltd., and E-MMA (ethylene-methyl methacrylate copolymer) are trade names “ACRIFT” manufactured by Sumitomo Chemical Co., Ltd. ACRYFT) ”and E-EAA (ethylene-ethyl acrylate copolymer) as Nippon Polyethylene Trade name “REX PEARL EEA” manufactured by Co., Ltd., E-GMA (ethylene-glycidyl methacrylate copolymer) as trade name “BONDAST” manufactured by Sumitomo Chemical Co., Ltd., and ionomer Is a product name “HIMILAN” manufactured by Mitsui DuPont Polychemical Co., Ltd., and as a silane crosslinkable polyolefin, a product name “LINKLON” manufactured by Mitsubishi Chemical Corporation, maleic anhydride graft copolymer. Examples thereof include “Admer” manufactured by Mitsui Chemicals, Inc.

  The melt flow rate (MFR) of the (modified) polyolefin resin is not particularly limited. For example, in the case of a polyethylene resin, MFR (JIS K7210, temperature: 190 ° C., load: 21.18 N) is Preferably it is 0.5 g / 10 min or more, more preferably 2 g / 10 min or more, further preferably 3 g / 10 min or more, and preferably 100 g / 10 min or less, more preferably 50 g / 10 min or less, still more preferably 30 g / 10 min. The following are used. Here, the MFR may be selected in consideration of molding processability at the time of molding the sheet, adhesiveness at the time of sealing the solar cell element (cell), wraparound condition, and the like. For example, when calendering a sheet, the MFR is preferably relatively low, specifically 0.5 g / 10 min or more and 5 g / 10 min or less from the handling property when the sheet is peeled off from the forming roll. In the case of extrusion molding using a T-die, the MFR is preferably 2 g / 10 min, more preferably 3 g / 10 min or more, and preferably 50 g / min from the viewpoint of reducing the extrusion load and improving the extrusion rate. What is used is 10 min or less, more preferably 30 g / 10 min or less. Furthermore, from the viewpoint of adhesion and ease of wraparound when sealing a solar cell element (cell), the MFR is preferably 2 g / 10 min, more preferably 3 g / 10 min or more, and preferably 50 g / What is used is 10 min or less, more preferably 30 g / 10 min or less.

  The purpose of the sealing material used in the present invention is to further improve physical properties (flexibility, heat resistance, transparency, adhesiveness, etc.), molding processability, economic efficiency, etc. without departing from the gist of the present invention. Resins other than those described above can be mixed. Examples of the resin include various elastomers (olefin-based, styrene-based, etc.), resins modified with polar groups such as carboxyl groups, amino groups, imide groups, hydroxyl groups, epoxy groups, oxazoline groups, thiol groups, silanol groups, and the like. Examples include tackifying resins.

  Examples of the tackifying resin include petroleum resins, terpene resins, coumarone-indene resins, rosin resins, and hydrogenated derivatives thereof. Specifically, the petroleum resin includes cyclopentadiene or an alicyclic petroleum resin derived from a dimer thereof and an aromatic petroleum resin derived from a C9 component, and the terpene resin includes a terpene resin derived from β-pinene and a terpene resin. Examples of the phenol resin include coumarone-indene resin and coumarone-indene copolymer, and coumarone-indene-styrene copolymer, and examples of rosin resins include rosin resins such as gum rosin and wood rosin, glycerin, An esterified rosin resin modified with pentaerythritol or the like can be exemplified. The tackifying resin can be obtained with various softening temperatures mainly depending on the molecular weight, but the compatibility, bleed over time and color tone when mixed with the polyolefin resin and modified polyolefin resin component described above. In view of heat stability, the softening temperature is preferably 100 or higher, more preferably 120 ° C. or higher, and preferably 150 ° C. or lower, more preferably 140 ° C. or lower. preferable. In the case of mixing a resin other than the polyolefin-based resin described above, the content is preferably 20% by mass or less and more preferably 10% by mass or less with respect to 100% by mass of the resin composition constituting the sealing material layer in the present invention.

  Moreover, various additives can be added to the sealing material used in the present invention as necessary. Examples of the additive include a silane coupling agent, an antioxidant, an ultraviolet absorber, a weathering stabilizer, a light diffusing agent, a nucleating agent, a pigment (for example, a white pigment), a flame retardant, and a discoloration preventing agent. . In the present invention, it is preferable that at least one additive selected from a silane coupling agent, an antioxidant, an ultraviolet absorber, and a weathering stabilizer is added for reasons described later.

[Silane coupling agent]
Silane coupling agents are useful for improving adhesion to protective materials for sealing materials (glass, resin front sheets, back sheets, etc.) and solar cell elements. Examples include vinyl groups, Examples thereof include compounds having a hydrolyzable group such as an alkoxy group in addition to an unsaturated group such as an acryloxy group and a methacryloxy group, an amino group, and an epoxy group. Specific examples of the silane coupling agent include N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, and γ-aminopropyltriethoxy. Examples include silane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and the like. In the present invention, γ-glycidoxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane are preferably used because of good adhesiveness and little discoloration such as yellowing. The addition amount of the silane coupling agent is to suppress an increase in resin pressure at the time of extrusion molding and the generation of foreign matters such as gels and fish eyes, and also to suppress problems such as bleed out from molded products. The amount is preferably 5% by mass or less and more preferably 3% by mass or less with respect to 100% by mass of the resin composition constituting the sealing material layer in the present invention. Moreover, in order to express adhesiveness, it is preferable that it is 0.1 mass% or more, and it is more preferable that it is 0.2 mass% or more.
In addition, similar to the silane coupling agent, a coupling agent such as an organic titanate compound can be effectively used.

[Antioxidant]
As the antioxidant, various commercially available products can be applied, and various types such as phenol, sulfur, phosphite and the like such as monophenol, bisphenol and polymer phenol can be exemplified.

Examples of the monophenol antioxidant include 2,6-di-tert-butyl-p-cresol, butylated hydroxyanisole, 2,6-di-tert-butyl-4-ethylphenol, and octadecyl-3- And (3,5-di-tert-butyl-4-hydroxyphenyl) propionate.
Examples of the bisphenol antioxidant include 2,2′-methylene-bis- (4-methyl-6-tert-butylphenol), 2,2′-methylene-bis- (4-ethyl-6-tert-butylphenol), 4,4′-thiobis- (3-methyl-6-tert-butylphenol), 4,4′-butylidene-bis- (3-methyl-6-tert-butylphenol), 3,9-bis [{1,1 -Dimethyl-2- {β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} ethyl} 2,4,9,10-tetraoxaspiro] 5,5-undecane, etc. Can do.

  Polymeric phenolic antioxidants include 1,1,3-tris- (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3,5-trimethyl-2,4,6 -Tris (3,5-di-tert-butyl-4-bidoxybenzyl) benzene, tetrakis- {methylene-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate} Methane, bis {(3,3′-bis-4′-hydroxy-3′-tert-butylphenyl) butyric acid} glycol ester, 1,3,5-tris (3 ′, 5′-di-tert -Butyl-4'-hydroxybenzyl) -s-triazine-2,4,6- (1H, 3H, 5H) trione, tocopherol (vitamin E) and the like.

  Examples of the sulfur-based antioxidant include dilauryl thiodipropionate, dimyristyl thiodipropionate, and distearyl thiopropionate.

  Phosphite antioxidants include triphenyl phosphite, diphenylisodecyl phosphite, phenyl diisodecyl phosphite, 4,4′-butylidene-bis (3-methyl-6-tert-butylphenyl-di-tridecyl) phos Phyto, cyclic neopentanetetrayl bis (octadecyl phosphite), tris (mono and / or dinonylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, diisodecyl pentaerythritol diphosphite 9,10-dihydro-9-oxa-10-phosphaphenalene-10-oxide, 10- (3,5-di-tert-butyl-4-hydroxybenzyl) -9,10-dihydro-9-oxa -10-phosphaphenanthrene-10 Oxide, 10-decyloxy-9,10-dihydro-9-oxa-10-phosphaphenanthrene, cyclic neopentanetetraylbis (2,4-di-tert-butylphenyl) phosphite, cyclic neopentane Examples thereof include tetrayl bis (2,6-di-tert-butylphenyl) phosphite, 2,2-methylene bis (4,6-tert-butylphenyl) octyl phosphite, and the like.

In the present invention, phenol-based and phosphite-based antioxidants are preferably used in view of the effects of antioxidants, thermal stability, economy, etc., and using both in combination as an antioxidant with respect to the added amount It is more preferable because the effect can be enhanced.
The addition amount of the antioxidant is usually 0.1% by mass or more, preferably 0.2% by mass or more, and 1% by mass with respect to 100% by mass of the resin composition constituting the sealing material layer in the present invention. % Or less, preferably 0.5% by mass or less.

[Ultraviolet absorber]
As the ultraviolet absorber, various commercially available products can be applied, and various types such as benzophenone, benzotriazole, triazine, and salicylic acid ester can be exemplified.

  Examples of the benzophenone-based UV absorber include 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2′-carboxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-n. -Dodecyloxybenzophenone, 2-hydroxy-4-n-octadecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 2-hydroxy-5-chlorobenzophenone, 2 , 4-dihydroxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, etc. It is possible.

The benzotriazole-based ultraviolet absorber is a hydroxyphenyl-substituted benzotriazole compound, for example, 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-butylphenyl) Benzotriazole, 2- (2-hydroxy-3,5-dimethylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) -2H-benzotriazole, 2- (2-methyl-4-hydroxy Phenyl) benzotriazole, 2- (2-hydroxy-3-methyl-5-tert-butylphenyl) benzotriazole, 2- (2-hydroxy-3,5-di-t-amylphenyl) benzotriazole, 2- ( 2-hydroxy-3,5-di-tert-butylpheny ) Benzotriazole and the like.
Examples of the triazine ultraviolet absorber include 2- [4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol, 2- (4 , 6-diphenyl-1,3,5-triazin-2-yl) -5- (hexyloxy) phenol and the like.
Examples of salicylic acid esters include phenyl salicylate and p-octylphenyl salicylate.

  The addition amount of the ultraviolet absorber is usually 0.01% by mass or more, preferably 0.05% by mass or more with respect to 100% by mass of the resin composition constituting the sealing material layer in the present invention, and 2. It is preferable to add in the range of 0% by mass or less, preferably 0.5% by mass or less.

[Weatherproof stabilizer]
A hindered amine light stabilizer is suitably used as a weather stabilizer that imparts weather resistance in addition to the above ultraviolet absorber. A hindered amine light stabilizer does not absorb ultraviolet rays like an ultraviolet absorber, but exhibits a remarkable synergistic effect when used together with an ultraviolet absorber. In addition to hindered amines, there are those that function as light stabilizers, but they are often colored and are not preferred for the encapsulant layer in the present invention.

Examples of hindered amine light stabilizers include dimethyl succinate-1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate, poly [{6- (1,1 , 3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl} {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethylene {{2, 2,6,6-tetramethyl-4-piperidyl} imino}], N, N′-bis (3-aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2, 6,6-pentamethyl-4-piperidyl) amino] -6-chloro-1,3,5-triazine condensate, bis (2,2,6,6-tetramethyl-4-piperidyl) separate, 2- (3 , 5-Di-tert-4-H And droxybenzyl) -2-n-butylmalonate bis (1,2,2,6,6-pentamethyl-4-piperidyl).
The addition amount of the hindered amine light stabilizer is usually 0.01% by mass or more, preferably 0.05% by mass or more, with respect to 100% by mass of the resin composition constituting the sealing material layer in the present invention. 0.5% by mass or less, preferably 0.3% by mass or less.

  The above-mentioned antioxidants, ultraviolet absorbers, and weathering stabilizers generally tend to cause yellowing as the addition amount increases. Therefore, it is preferable that only the minimum necessary amount is added, and no addition is also preferable. It is.

[Flexibility]
The flexibility of the sealing material used in the present invention may be appropriately adjusted in consideration of the shape, thickness, installation location, etc. of the applied solar cell. For example, the vibration frequency in dynamic viscoelasticity measurement is 10 Hz, the temperature The storage elastic modulus (E ′) at 20 ° C. is preferably 1 to 2000 MPa. From the viewpoint of protection of the solar cell element, the storage elastic modulus (E ′) is preferably lower, but handling properties when the above-described sealing material is collected in a sheet shape or the like, and blocking of sheet surfaces from each other are prevented. In consideration, it is more preferably 3 to 1000 MPa, further preferably 5 to 500 MPa, and particularly preferably 10 to 100 MPa. The storage elastic modulus (E ′) is obtained by measuring at a predetermined temperature at a vibration frequency of 10 Hz using a viscoelasticity measuring device and obtaining a value at a temperature of 20 ° C.

[Method of forming a sealing material]
Next, a method for forming a sealing material will be described. The thickness of the sealing sheet is not particularly limited, but is usually 30 μm or more, preferably 50 μm or more, more preferably 100 μm or more, and about 1000 μm (1 mm) or less, preferably 700 μm or less, more preferably 500 μm. The following is sufficient.
As a film forming method, a known method, for example, a single-screw extruder, a multi-screw extruder, a Banbury mixer, a kneader or the like may be used, and an extrusion casting method using a T die or a calendar method may be employed. Although not particularly limited, in the present invention, an extrusion casting method using a T die is preferably used from the viewpoints of handleability and productivity. The molding temperature in the extrusion casting method using a T die is appropriately adjusted depending on the flow characteristics and film forming properties of the resin composition to be used, but is generally 80 ° C. or higher, preferably 100 ° C. or higher, more preferably 120 ° C. or higher, More preferably, it is 140 ° C. or higher, and is generally 300 ° C. or lower, preferably 250 ° C. or lower, more preferably 200 ° C. or lower, more preferably 180 ° C. or lower. When a silane coupling agent or the like is added, a crosslinking reaction It is preferable to lower the molding temperature in order to suppress an increase in resin pressure and an increase in fish eyes accompanying the above. Various additives such as silane coupling agents, antioxidants, UV absorbers and weathering stabilizers may be dry blended with the resin in advance and then supplied to the hopper. It may be supplied after producing or a master batch in which only the additive is previously concentrated in the resin may be produced and supplied. In addition, if necessary, embossing and various irregularities for the purpose of preventing sheet blocking when the sheet is used as a scroll and improving the ease of air removal and handling in the sealing process of solar cell elements. Processing may be performed (conical, pyramidal, hemispherical, etc.). Furthermore, when a sheet is formed, another base film (such as an expanded polyester film (OPET) or an expanded polypropylene film (OPP)) and an extrusion laminate are used for the purpose of improving the handleability when forming the sheet. Lamination may be performed by a method such as a sand lamination method.

  The embossed shape is not limited, and examples thereof include fine patterns such as stripes, textures, pearskins, crests, diamond lattices, synthetic leather-like grain patterns, polygonal pyramids, cones, and planar star shapes. In particular, in a shape with periodicity, an embossed shape without periodicity is preferable because it becomes more difficult to slip when a convex portion and a concave portion overlap each other. Further, the embossing depth is preferably 10 to 40 μm in view of ease of sheet processability.

  The method for winding the solar cell encapsulating sheet around the core is not limited. For example, there is a method in which the winding tension is 5 kgf or less, preferably 3 kgf or less, more preferably 2 kgf or less with respect to the entire width of the sheet. Further, in order to prevent winding deviation when transported as a roll body, the winding tension is preferably 0.5 kgf or more, more preferably 1 kgf or more with respect to the entire sheet width.

Examples 1-3 and Comparative Examples 1-3
(Sealing sheet roll)
Ethylene-octene random copolymer (manufactured by Dow Chemical Co., Ltd., trade name: engage 8200, octene content: 10.1 mol% (31 mass%), MFR: 5, Tm: 65 ° C., ΔHm: 53 J / g) 95 parts by mass and ethylene-octene block copolymer (manufactured by Dow Chemical Co., Ltd., trade name: Infuse 9100, octene content: 12.8 mol% (37 mass%), MFR: 1, Tm 119 ° C., ΔHm: 38 J / g) mixed at a ratio of 5 parts by mass, a rubber roll embossed and melt-kneaded at a set temperature of 200 ° C. using a 40 mmφ single-screw extruder equipped with a T die. And a 20 ° C. cast roll to obtain a solar cell encapsulating sheet having a thickness of 500 μm and an emboss depth of 30 μm. This was wound around a paper core having an inner diameter (ID) of 76 mm, a thickness of 10 mm, and a length of 1100 mm so as to have a width (L) of 1100 mm and a length of 100 m to obtain a sealing sheet roll body. The outer diameter (D) at this time was 270 mm.

(Support member on which a plurality of convex portions are formed)
A support member in which a plurality of convex portions having the convex portion height described in Table 1 was formed was used.
The support member is 10 mm thick, 1100 mm long, and 1100 mm long square cardboard paper. A plate-shaped member having 9 holes (3 × 3) of 74 mm diameter circular holes is provided with a thickness of 2 mm and convex portions ( (Cylindrical shape) was formed by fitting with a polypropylene convex support having an outer diameter of 74 mm and an outer diameter of the flange portion of 95 mm.

(Production of packaging)
A flat shape formed on a pallet made of wood having a length of 1140 mm, a width of 1140 mm, and a height of 120 mm, using a corrugated cardboard having a thickness of 10 mm and having the same dimensions after folding. The bottom cover was installed, and the support member was installed thereon. Subsequently, the convex part of the supporting member was engaged and fixed inside the core of the roll body. Next, the cardboard paper having a thickness of 10 mm is used, adjusted to have the same height as the length of the core, and the body formed in two pieces is placed on the bottom cover and combined into a cylindrical shape Formed. The two joints were fixed with tape. On the body, a cardboard paper having a thickness of 10 mm was used, and a top cover that was adjusted to the same dimensions as the bottom cover and formed in a flat shape was disposed. The bottom cover and the top cover were folded to form a lid. Finally, the fork insertion hole of the pallet and the point cover were bound by a polypropylene binding band and integrated.

(Evaluation)
(Swing suppression)
The package was loaded on a truck, and the appearance of the encapsulating sheet roll body after transporting back and forth between Shiga Prefecture and Nagoya Port was evaluated according to the following criteria.
(◎) Wrinkles and undulations do not occur on the roll body.
(◯) Mild wrinkles and undulations occur on the roll body.
(×) Large wrinkles and undulations are generated in the roll body.

(Workability)
The workability when the roll body was stored in the packaging container to form the packaging body and when the roll body was taken out of the packaging body was evaluated according to the following criteria.
(A) The roll body can be easily stored and taken out by one person alone in the packing container.
(◯) The roll body can be easily stored in a packing container by two persons and taken out.
(X) Unless the two people work carefully, the roll body cannot be stored in the packing container and cannot be taken out.

  Tables 1 to 3 show the results of evaluation of shaking suppression and workability for Examples 1 to 3 and Comparative Examples 1 to 3.

As shown in Table 1, the packaging bodies of Examples 1 to 3 having H / ID within the scope of the present invention obtained good results.
From Comparative Examples 1 and 2, even if it does not have a convex portion, or if it has H / ID below (small) the range of the present invention, the roll body could not be suppressed.
From Comparative Example 3, when the H / ID exceeded (large) the range of the present invention, a result inferior in workability was obtained.

Examples 4 and 5 and Comparative Example 4
The package was stored in two layers in a 40-foot tall container, and the loading efficiency was evaluated according to the following criteria in addition to the above-described shaking suppression and workability.
The packaging body of Example 4 is the same as that of Example 1, and the packaging body of Example 5 is changed to the length of the core in Example 2 to 1110 mm (the core extends from the both ends of the roll by 5 mm). Thus, the package of Comparative Example 4 is obtained by changing the length of the core in Comparative Example 1 to 1160 mm (the core extends 30 mm from both ends of the roll).

(Loading efficiency)
The loading efficiency when the package was stored in a 40-foot tall container was evaluated according to the following criteria.
(◎) The height when the packaging body is two-tiered is 2500 mm or less (○) The height when the packaging body is two-tiered is greater than 2500 mm and not more than 2550 mm (x) The packaging body is two-tiered The height is larger than 2550mm

  As shown in Table 2, the loading efficiency was good when the amount of overhang of the core was 15 mm or less, and the loading efficiency was poor when the amount exceeded (large) 15 mm.

DESCRIPTION OF SYMBOLS 10 Roll body 10a Solar cell sealing sheet 10b Core 20 Packing body 22A Palette 22B Bottom surface cover 22C Body 22D Top surface cover 24 Support member 24a Convex part 24b Through-hole 24c Convex support tool having a flange part 26 Binding band 30 Container

Claims (4)

A plurality of roll bodies having a hollow core and a solar cell encapsulating sheet wound on the peripheral surface of the core, and a pallet, a bottom cover, a body, and a top surface for storing the plurality of roll bodies A packaging container composed of a cover, and a support member provided on a bottom cover of the packaging container and formed with a plurality of convex portions for supporting the core,
The convex portion of the support member is engaged in the winding core,
And the core inner diameter (ID) and the height (H) of the convex portion of the support member have a relationship of 0.2 <[H / ID] <1.
Package of solar cell sealing sheet.   The package of Claim 1 whose amount of protrusions of the core from the edge part of the width direction of the sealing sheet for solar cells is 0 mm-15 mm.   The package according to claim 1 or 2, wherein the support member is formed by fitting a convex support having a through hole and a flange portion formed in a plate-like member.   The package according to any one of claims 1 to 3, further comprising a support member formed with a plurality of convex portions for supporting the winding core inside the top cover.