WO2019096866A1 - Use of an adhesive tape in edge sealing of glass solar panels - Google Patents

Use of an adhesive tape in edge sealing of glass solar panels Download PDF

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Publication number
WO2019096866A1
WO2019096866A1 PCT/EP2018/081268 EP2018081268W WO2019096866A1 WO 2019096866 A1 WO2019096866 A1 WO 2019096866A1 EP 2018081268 W EP2018081268 W EP 2018081268W WO 2019096866 A1 WO2019096866 A1 WO 2019096866A1
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WO
WIPO (PCT)
Prior art keywords
adhesive tape
psa
carrier
use according
adhesive layer
Prior art date
Application number
PCT/EP2018/081268
Other languages
French (fr)
Inventor
Andreas Stein
Haofeng YANG
Xin Zhang
Jun Meng
Kanghui SUN
Original Assignee
Tesa Se
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tesa Se filed Critical Tesa Se
Publication of WO2019096866A1 publication Critical patent/WO2019096866A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/0488—Double glass encapsulation, e.g. photovoltaic cells arranged between front and rear glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10293—Edge features, e.g. inserts or holes
    • B32B17/10302—Edge sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present disclosure relates to a field of an adhesive, especially to a certain use of an adhesive tape.
  • Solar panels also referred to as photovoltaic modules or solar modules
  • front-end process by mutual superposition of the various layers to form the solar panel and a subsequent lamination process.
  • a plastic material placed below and above the solar cells melts and crosslinks.
  • the lamination can proceed in one or more stages influenced e.g. by pressure, temperature and time. After having passed the lamination process the solar cells are embedded in the transparent plastic layer which protects them from corrosion.
  • edge sealing tape To keep the layers which form the solar panel in place during the lamination process, usually an edge sealing tape is used. Edge sealing tapes currently available in the market in most cases are based on perforated PET carriers having silicone based adhesive thereon. When being removed after the lamination process, in many cases the edge protection tape breaks or residue of it remains on the solar panel which needs to be removed separately. Furthermore, it has been observed that melted encapsulation material is released which contaminates the glass panels of the solar module and/or the laminating device.
  • an object of the present disclosure is to enable a manufacturing process of a solar panel wherein no melted encapsulation material is released but nevertheless gas penetration is allowed during the laminating process. Furthermore, it shall be possible to remove the edge protection tape from the solar module after having passed the lamination process without any residue remaining.
  • an adhesive tape is used in methods of manufacturing solar panels, the adhesive tape comprising a carrier being a woven fabric and an adhesive layer.
  • a method for manufacturing a glass solar panel comprising:
  • a carrier being a woven fabric
  • step b) exposing the sealed stack resulting from step b) to a temperature of more than
  • the encapsulation material is an ethylene/vinly acetate copolymer (EVA).
  • the adhesive layer is a pressure-sensitive adhesive (PSA) layer. This enables residue-free removing of the adhesive tape after the manufacturing process of the solar panel is finished.
  • the thickness of the adhesive layer is from 2 to 100 pm according to some embodiments of the invention.
  • the adhesive tape comprising a woven fabric carrier provides for improved bumper property.
  • Woven fabric carriers exhibit enlarged flexibility which is especially advantageous in this respect. Therefore, according to some embodiments of the present disclosure, the adhesive tape is used in methods of manufacturing solar glass panels. According to some further embodiments of the present disclosure, the adhesive tape is used in the lamination of double glass solar panels at temperatures of
  • the carrier of the adhesive tape is a woven fabric.
  • the carrier is a woven polyester, polyamide or viscose fabric and/or a woven blend fabric comprising the stated materials.
  • a release liner is formed on the adhesive layer which is commonly also referred to as release film.
  • the release film may be made of a material commonly used for a release film in this art, such as PE release film or PET release film, and will not be described in detail here.
  • Fig. 1 is a schematic view showing the order of layers usually used for manufacturing a solar module. Outer layers are formed by glass panels 1 and G, followed by the layers of encapsulation material 2 and 2’.
  • the central layer 3 is an arrangement of solar cells.
  • FIG. 2 is a schematic view showing a cross section through the stacked layers for manufacturing a solar module wrapped by a perforated adhesive tape 4 as used according to the state of the art.
  • Fig. 3 is a schematic view showing a cross section through the stacked layers for manufacturing a solar module wrapped by an adhesive tape 5 according to the present disclosure.
  • Fig. 4 shows a glass solar panel after lamination wherein an adhesive tape according to embodiment 1 as set forth hereinafter was used for edge protection.
  • FIG. 5 shows the solar panel edge according to embodiment 1 as set forth hereinafter after removing of the adhesive tape.
  • Fig. 6 shows a glass solar panel after lamination wherein an adhesive tape according to embodiment 2 as set forth hereinafter was used for edge protection.
  • Fig. 7 shows the solar panel edge according to embodiment 2 as set forth hereinafter after removing of the adhesive tape.
  • Fig. 8 shows a glass solar panel after lamination wherein an adhesive tape according to embodiment 3 as set forth hereinafter was used for edge protection.
  • Fig. 9 shows the solar panel edge according to embodiment 3 as set forth hereinafter after removing of the adhesive tape.
  • the carrier of the adhesive tape which is used according to the present disclosure in manufacturing solar panels is a woven fabric.
  • Woven fabrics are composed of warp threads (longitudinal direction, machine direction, also corresponding to the longitudinal direction of the adhesive tape produced from them) and weft threads (transverse threads). The threads are woven typically in plain- weave construction.
  • the woven fabric carrier can be woven by any fiber which provides sufficient strength and temperature resistance for the manufacturing solar cells, more specifically a temperature resistance of up to 160 °C. According to some
  • the carrier is a woven polyester, polyamide or viscose fabric and/or a woven blend fabric comprising the stated materials.
  • the carrier is a woven polyester fabric, e.g. a woven polyethylene terephthalate (PET) fabric.
  • PET polyethylene terephthalate
  • the woven fabric has a mesh number of 50 - 150 / inch.
  • the mesh number is defined as the number of warp threads and weft threads per inch.
  • Woven fabric carriers with proper mesh number have turned out to be breathable carrier (sometimes also referred to as backing) materials which allow for blocking melted encapsulation material and for penetration of air.
  • the adhesive tape according to the present disclosure may completely prevent leaking of encapsulation material when it is melted and by this protect the laminating machine from pollution.
  • woven fabric carrier materials have turned out to allow for formation of suitable protective bumper properties for the solar module due to their flexibility.
  • the adhesive layer is a pressure-sensitive adhesive (PSA) layer.
  • PSA pressure-sensitive adhesive
  • the adhesive layer is selected from a solvent-based acrylic PSA, a UV-polymerized acrylic PSA, an extruded acrylic PSA, a rubber PSA, an electron beam-polymerized PSA and a silicone PSA.“Rubber PSA” comprises both natural and synthetic rubber PSA.
  • Further components of the PSA formulations mentioned hereinbefore may comprise tackifier resins, light stabilizers, plasticizing agents, fillers, antioxidants and/or flame retardants.
  • the pressure-sensitive adhesives may be prepared and processed from solution, from dispersion or from the melt, the latter including both batch and continuous methods.
  • the thickness of the adhesive layer is from 2 to 100 pm, optionally from 20 to 50 pm.
  • the adhesive layer is stable at temperatures of up to 160 °C for at least 10 minutes, optionally for at least 20 minutes up to 30 minutes.“Stable” means that the adhesive properties of the adhesive layer remain substantially unchanged after temperature treatment.
  • a release film may be formed on the adhesive layer. The release film functions to protect and isolate the adhesive tape and can improve the release performance.
  • the adhesive tape used according to the present disclosure is non-perforated, i.e. continuous.
  • the adhesive tape according to the present disclosure in methods of manufacturing solar panels it becomes possible to protect the laminating device from pollution resulting from leak of encapsulation material and to remove the adhesive tape in one piece without any residues after having finished the lamination of the solar panel. This results in faster production processes, reduction of rework and saving of time and waste. Furthermore, the optical appearance of the solar module edges will be improved. Furthermore, an evenly shaped protective bulk is formed around the solar panel edges which increases the level of protection from mechanical impact.
  • the layers for forming the solar panel are stacked in the order illustrated by figure 1 , wherein 1 and 1’ represent the outermost first and second glass panel, 2 and 2’ represent the first and second encapsulation material and 3 represents the solar cells.
  • the encapsulation material is selected from an ethylene/vinyl acetate copolymer (EVA) and a polyolefin elastomer (POE).
  • the encapsulation material is an ethylene/vinyl acetate copolymer (EVA).
  • FIG. 2 illustrates an edge of a stack of layers of a solar panel wrapped by an adhesive tape according to the state of the art, wherein 1, G, 2, 2’ and 3 have the same denotation as in figure 1 and 4 represents a perforated adhesive tape as used according to the state of the art.
  • Figure 3 illustrates an edge of a stack of layers of a solar panel wrapped by an adhesive tape according to the present disclosure, wherein 1, 1’, 2, 2’ and 3 have the same denotation as in figure 1 and 5 represents a continuous adhesive tape as used according to the present disclosure.
  • the sealed stack resulting from the aforementioned step of the method according to the present disclosure will be exposed to a temperature of more than 100 °C for at least 10 minutes.
  • the temperature in this step is 100 - 180 °C.
  • the temperature in this step is at least 140 °C.
  • the sealed stack resulting from step b) is exposed to temperatures of 140 - 160 °C for up to 30 minutes, optionally for up to 40 minutes. Under these conditions, the encapsulating material will melt. Upon solidification of the encapsulating material, the solar cells will be encapsulated and thus protected from environmental influence.
  • the method further comprises a step d) wherein the adhesive tape is removed from the solar glass panel thus manufactured.
  • an adhesive tape consisting of a PET fabric woven backing (mesh number 62, WTFE) and an acrylic pressure-sensitive adhesive (BDF505 VIGteQnos Co., Ltd.) was used.
  • an adhesive tape consisting of a PET fabric woven backing (mesh number 62, WTFE), an acrylic pressure-sensitive adhesive (BDF505, VIGteQnos Co.; Ltd.) and a release liner (TP153, Loparex) which is arranged on the pressure-sensitive adhesive layer was used.
  • Embodiment 3 (comparative example)
  • an adhesive tape consisting of a PET film backing (PET 50, tesa SE) and a silicone pressure-sensitive adhesive (7388, Dow coming was used.
  • the adhesive tapes of embodiments 1 - 3 were applied to seal all four edges of a double glass solar panels.
  • the stacked panels with the tapes applied were sent to an oven that was heated to 160 °C. After being stored in the oven for 30 minutes and cooling down to room temperature the tapes were removed.
  • the edges were sealed very well and no leakage of EVA from the solar panel edge was observed. Also, no adhesive tape residue on the surface of the solar panel was observed.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The present disclosure provides the use of an adhesive tape, the adhesive tape comprising: a carrier being a woven fabric;and an adhesive layer in methods of manufacturing solar panels. Using such adhesive tape in manufacturing methods of solar panels enables improved sealing against leakage of melted encapsulating material, improved resistance against mechanical impact and improved removability of the adhesive tape after lamination of the solar panel. Furthermore, a method of manufacturing a glass solar panel using the adhesive tape is disclosed.

Description

USE OF AN ADHESIVE TAPE IN EDGE SEALING OF GLASS SOLAR
PANELS
TECHNICAL FIELD
[0001] The present disclosure relates to a field of an adhesive, especially to a certain use of an adhesive tape.
BACKGROUND
[0002] Solar panels (also referred to as photovoltaic modules or solar modules) usually are produced in the so-called front-end process by mutual superposition of the various layers to form the solar panel and a subsequent lamination process. In the latter, a plastic material placed below and above the solar cells melts and crosslinks. The lamination can proceed in one or more stages influenced e.g. by pressure, temperature and time. After having passed the lamination process the solar cells are embedded in the transparent plastic layer which protects them from corrosion.
[0003] To keep the layers which form the solar panel in place during the lamination process, usually an edge sealing tape is used. Edge sealing tapes currently available in the market in most cases are based on perforated PET carriers having silicone based adhesive thereon. When being removed after the lamination process, in many cases the edge protection tape breaks or residue of it remains on the solar panel which needs to be removed separately. Furthermore, it has been observed that melted encapsulation material is released which contaminates the glass panels of the solar module and/or the laminating device.
SUMMARY [0004] In view of the above, an object of the present disclosure is to enable a manufacturing process of a solar panel wherein no melted encapsulation material is released but nevertheless gas penetration is allowed during the laminating process. Furthermore, it shall be possible to remove the edge protection tape from the solar module after having passed the lamination process without any residue remaining.
[0005] According to one aspect of the present disclosure, an adhesive tape is used in methods of manufacturing solar panels, the adhesive tape comprising a carrier being a woven fabric and an adhesive layer.
[0006] According to another aspect of the present disclosure, a method for manufacturing a glass solar panel is provided, the method comprising:
a) Stacking in the following order
a first glass panel,
a first encapsulation material,
an arrangement of solar cells,
a second encapsulation material, and
a second glass panel;
b) sealing at least one edge of the stack resulting from step a) by an adhesive tape, wherein the adhesive tape comprises:
a carrier being a woven fabric, and
an adhesive layer;
c) exposing the sealed stack resulting from step b) to a temperature of more than
100 °C for at least 10 minutes. [0007] The use of an adhesive tape comprising a woven fabric carrier allows for the penetration of gas during the lamination process but blocks the melted encapsulation material. Thus, if all edges of the stacked layers of the solar module are wrapped by the adhesive tape it will be possible to completely avoid leaking of melted encapsulation material. According to some embodiments of the present disclosure, the encapsulation material is an ethylene/vinly acetate copolymer (EVA).
[000S] Furthermore, usually perforated tapes according to the state of the art need edge trimming which does not allow for a clean formation of a protective bumper around the sensitive edge of a solar module. It has been found that by using the adhesive tape according to the invention formation of a cleanly shaped protective bumper from residual encapsulation material is formed having a smooth surface.
[0009] According to some embodiments of the present disclosure, the adhesive layer is a pressure-sensitive adhesive (PSA) layer. This enables residue-free removing of the adhesive tape after the manufacturing process of the solar panel is finished. The thickness of the adhesive layer is from 2 to 100 pm according to some embodiments of the invention.
[0010] In the case where a solar panel includes glass panels the use of the adhesive tape comprising a woven fabric carrier provides for improved bumper property. Woven fabric carriers exhibit enlarged flexibility which is especially advantageous in this respect. Therefore, according to some embodiments of the present disclosure, the adhesive tape is used in methods of manufacturing solar glass panels. According to some further embodiments of the present disclosure, the adhesive tape is used in the lamination of double glass solar panels at temperatures of
100 - 180 °C.
[0011] According to the present disclosure, the carrier of the adhesive tape is a woven fabric. According to some embodiments of the present disclosure, the carrier is a woven polyester, polyamide or viscose fabric and/or a woven blend fabric comprising the stated materials.
[0012] According to some embodiments of the present disclosure, a release liner is formed on the adhesive layer which is commonly also referred to as release film. The release film may be made of a material commonly used for a release film in this art, such as PE release film or PET release film, and will not be described in detail here.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Fig. 1 is a schematic view showing the order of layers usually used for manufacturing a solar module. Outer layers are formed by glass panels 1 and G, followed by the layers of encapsulation material 2 and 2’. The central layer 3 is an arrangement of solar cells.
[0014] Fig. 2 is a schematic view showing a cross section through the stacked layers for manufacturing a solar module wrapped by a perforated adhesive tape 4 as used according to the state of the art.
[0015] Fig. 3 is a schematic view showing a cross section through the stacked layers for manufacturing a solar module wrapped by an adhesive tape 5 according to the present disclosure. [0016] Fig. 4 shows a glass solar panel after lamination wherein an adhesive tape according to embodiment 1 as set forth hereinafter was used for edge protection.
[0017] Fig. 5 shows the solar panel edge according to embodiment 1 as set forth hereinafter after removing of the adhesive tape.
[0018] Fig. 6 shows a glass solar panel after lamination wherein an adhesive tape according to embodiment 2 as set forth hereinafter was used for edge protection.
[0019] Fig. 7 shows the solar panel edge according to embodiment 2 as set forth hereinafter after removing of the adhesive tape.
[0020] Fig. 8 shows a glass solar panel after lamination wherein an adhesive tape according to embodiment 3 as set forth hereinafter was used for edge protection.
[0021] Fig. 9 shows the solar panel edge according to embodiment 3 as set forth hereinafter after removing of the adhesive tape.
DETAILED DESCRIPTION
[0022] In order to make the object, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described in a clear and complete manner in conjunction with the accompanying drawings thereof. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. The other embodiments obtained by a person skilled in the art based on these described embodiments will also fall within the scope of the present disclosure.
[0023] The carrier of the adhesive tape which is used according to the present disclosure in manufacturing solar panels is a woven fabric. The woven carrier fabrics are characterized by the thread material (polyester yam, for example), the thread weight of the threads (weight per unit length, unit: dtex; 1 dtex = 1 g/lO 000 m of thread), and the thread density or number of threads (number of threads per cm). Woven fabrics are composed of warp threads (longitudinal direction, machine direction, also corresponding to the longitudinal direction of the adhesive tape produced from them) and weft threads (transverse threads). The threads are woven typically in plain- weave construction.
[0024] The woven fabric carrier can be woven by any fiber which provides sufficient strength and temperature resistance for the manufacturing solar cells, more specifically a temperature resistance of up to 160 °C. According to some
embodiments of the present disclosure, the carrier is a woven polyester, polyamide or viscose fabric and/or a woven blend fabric comprising the stated materials.
Optionally, the carrier is a woven polyester fabric, e.g. a woven polyethylene terephthalate (PET) fabric.
[0025] According to some embodiments of the present disclosure, the woven fabric has a mesh number of 50 - 150 / inch. The mesh number is defined as the number of warp threads and weft threads per inch. Woven fabric carriers with proper mesh number have turned out to be breathable carrier (sometimes also referred to as backing) materials which allow for blocking melted encapsulation material and for penetration of air. Thus, the adhesive tape according to the present disclosure may completely prevent leaking of encapsulation material when it is melted and by this protect the laminating machine from pollution. Furthermore, woven fabric carrier materials have turned out to allow for formation of suitable protective bumper properties for the solar module due to their flexibility.
[0026] To further improve the adhesive property of the adhesive tape, according to some embodiments of the present disclosure the adhesive layer is a pressure-sensitive adhesive (PSA) layer. Pressure-sensitive adhesives are
characterized in that they are viscoelastic compositions which at room temperature in dry state remain permanently tacky and adhesive. Bonding takes place through gentle applied pressure immediately to virtually all substrates. Optionally the adhesive layer is selected from a solvent-based acrylic PSA, a UV-polymerized acrylic PSA, an extruded acrylic PSA, a rubber PSA, an electron beam-polymerized PSA and a silicone PSA.“Rubber PSA” comprises both natural and synthetic rubber PSA.
[0027] Further components of the PSA formulations mentioned hereinbefore may comprise tackifier resins, light stabilizers, plasticizing agents, fillers, antioxidants and/or flame retardants. The pressure-sensitive adhesives may be prepared and processed from solution, from dispersion or from the melt, the latter including both batch and continuous methods.
[0028] According to some embodiments of the present disclosure, the thickness of the adhesive layer is from 2 to 100 pm, optionally from 20 to 50 pm. According to further embodiments of the present disclosure, the adhesive layer is stable at temperatures of up to 160 °C for at least 10 minutes, optionally for at least 20 minutes up to 30 minutes.“Stable” means that the adhesive properties of the adhesive layer remain substantially unchanged after temperature treatment. [0029] Furthermore, in some embodiments of the present disclosure, a release film may be formed on the adhesive layer. The release film functions to protect and isolate the adhesive tape and can improve the release performance.
[0030] Apparently, the adhesive tape used according to the present disclosure is non-perforated, i.e. continuous.
[0031] By using the adhesive tape according to the present disclosure in methods of manufacturing solar panels it becomes possible to protect the laminating device from pollution resulting from leak of encapsulation material and to remove the adhesive tape in one piece without any residues after having finished the lamination of the solar panel. This results in faster production processes, reduction of rework and saving of time and waste. Furthermore, the optical appearance of the solar module edges will be improved. Furthermore, an evenly shaped protective bulk is formed around the solar panel edges which increases the level of protection from mechanical impact.
[0032] In order to manufacture a solar panel according to the present disclosure, the layers for forming the solar panel are stacked in the order illustrated by figure 1 , wherein 1 and 1’ represent the outermost first and second glass panel, 2 and 2’ represent the first and second encapsulation material and 3 represents the solar cells. According to some embodiments of the present disclosure, the encapsulation material is selected from an ethylene/vinyl acetate copolymer (EVA) and a polyolefin elastomer (POE). Optionally, the encapsulation material is an ethylene/vinyl acetate copolymer (EVA). [0033] At least one edge of the stack resulting from step a) of the method according to the present disclosure will be sealed by the adhesive tape described hereinbefore. Figure 2 illustrates an edge of a stack of layers of a solar panel wrapped by an adhesive tape according to the state of the art, wherein 1, G, 2, 2’ and 3 have the same denotation as in figure 1 and 4 represents a perforated adhesive tape as used according to the state of the art. Figure 3 illustrates an edge of a stack of layers of a solar panel wrapped by an adhesive tape according to the present disclosure, wherein 1, 1’, 2, 2’ and 3 have the same denotation as in figure 1 and 5 represents a continuous adhesive tape as used according to the present disclosure.
[0034] The sealed stack resulting from the aforementioned step of the method according to the present disclosure will be exposed to a temperature of more than 100 °C for at least 10 minutes. According to some embodiments of the present disclosure, the temperature in this step is 100 - 180 °C. Optionally, the temperature in this step is at least 140 °C. More specifically, the sealed stack resulting from step b) is exposed to temperatures of 140 - 160 °C for up to 30 minutes, optionally for up to 40 minutes. Under these conditions, the encapsulating material will melt. Upon solidification of the encapsulating material, the solar cells will be encapsulated and thus protected from environmental influence.
[0035] According to some embodiments of the present disclosure, the method further comprises a step d) wherein the adhesive tape is removed from the solar glass panel thus manufactured. By using the adhesive tape according to the present disclosure it becomes possible to remove the adhesive tape in one piece without leaving any residues of adhesive tape material on the glass solar panel.
[0036] Below, the adhesive tape according to the present disclosure will be explained by means of specific embodiments. It shall be understood that the present disclosure is not limited to these specific embodiments.
[0037] Embodiment 1
[0038] According to this embodiment, an adhesive tape consisting of a PET fabric woven backing (mesh number 62, WTFE) and an acrylic pressure-sensitive adhesive (BDF505 VIGteQnos Co., Ltd.) was used.
[0039] Embodiment 2
[0040] According to this embodiment, an adhesive tape consisting of a PET fabric woven backing (mesh number 62, WTFE), an acrylic pressure-sensitive adhesive (BDF505, VIGteQnos Co.; Ltd.) and a release liner (TP153, Loparex) which is arranged on the pressure-sensitive adhesive layer was used.
[0041] Embodiment 3 (comparative example)
[0042] According to this embodiment, an adhesive tape consisting of a PET film backing (PET 50, tesa SE) and a silicone pressure-sensitive adhesive (7388, Dow coming was used.
[0043] The adhesive tapes of embodiments 1 - 3 were applied to seal all four edges of a double glass solar panels. The stacked panels with the tapes applied were sent to an oven that was heated to 160 °C. After being stored in the oven for 30 minutes and cooling down to room temperature the tapes were removed. As can be seen from figures 5 and 7, in embodiments 1 and 2 the edges were sealed very well and no leakage of EVA from the solar panel edge was observed. Also, no adhesive tape residue on the surface of the solar panel was observed.
In contrast, as can be seen in figure 9 in embodiment 3 serious adhesive leakage through the perforations of the adhesive tape was observed. Also, residues of the adhesive tape remained on the surface of the solar panel.

Claims

What is claimed is:
1. Use of an adhesive tape, the adhesive tape comprising:
a carrier being a woven fabric; and
an adhesive layer
in methods of manufacturing solar panels.
2. The use according to claim 1, wherein the carrier is a woven polyester, polyamide or viscose fabric and/or a woven blend fabric comprising the stated materials.
3. The use according to claim 1, wherein the carrier is a woven polyester fabric.
4. The use according to claim 1, wherein the carrier is a woven PET fabric.
5. The use according to claim 1, wherein the woven fabric has a mesh number of 50 -150 / inch.
6. The use according to claim 1, wherein the adhesive layer is a pressure- sensitive adhesive layer.
7. The use according to claim 1, wherein the adhesive layer is selected from a solvent-based acrylic PSA, a UV-polymerized acrylic PSA, an extruded acrylic PSA, a rubber PSA, an elctron beam-polymerized PSA and a silicone PSA.
8. The use according to claim 1, wherein the thickness of the adhesive layer is from 2 to 100 pm.
9. The use according to claim 1, wherein the adhesive tape is used in methods of manufacturing glass solar panels.
10. The use according to claim 1, wherein the adhesive tape is used in the lamination of double glass solar panels at temperatures of 100 - 180 °C.
11. A method for manufacturing a glass solar panel, the method comprising: a) stacking in the following order
- a first glass panel,
- a first encapsulation material,
- an arrangement of solar cells,
- a second encapsulation material, and
- a second glass panel;
b) sealing at least one edge of the stack resulting from step a) by an adhesive tape, the adhesive tape comprising: - a carrier being a woven fabric, and
- an adhesive layer;
c) exposing the sealed stack resulting from step b) to a temperature of more than 100 °C for at least 10 minutes.
12. The method according to claim 11, wherein the carrier of the adhesive tape is a PET woven fabric.
13. The method according to claim 11, wherein the adhesive layer of the adhesive tape is selected from a solvent-based acrylic PSA, a UV-polymerized acrylic PSA, an extruded acrylic PSA, a rubber PSA, an electron beam-polymerized PSA and a silicone PSA.
14. The method according to claim 11, wherein the first and second encapsulation material is an ethylene/ vinyl acetate copolymer (EVA).
15. The method according to claim 11, wherein the temperature in step c) is
100 - 180 °C.
16. The method according to claim 11, wherein the method further comprises d) removing the adhesive tape from the glass solar panel thus manufactured.
PCT/EP2018/081268 2017-11-15 2018-11-14 Use of an adhesive tape in edge sealing of glass solar panels WO2019096866A1 (en)

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CN201711132643.1 2017-11-15
CN201711132643.1A CN109810641A (en) 2017-11-15 2017-11-15 Purposes of the splicing tape in the edge seal of glass solar solar panel

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Citations (2)

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US20100163099A1 (en) * 2008-12-31 2010-07-01 E. I. Du Pont De Nemours And Company Solar cell modules comprising encapsulant sheets with low haze and high moisture resistance
CN106653905A (en) * 2017-01-03 2017-05-10 张家港协鑫集成科技有限公司 Laminate and preparation method thereof, double glass photovoltaic modulies and preparation method thereof

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DE10039982A1 (en) * 2000-08-16 2002-03-07 Tesa Ag Adhesive tapes with a textile backing for wrapping elongated goods, such as, in particular, cable sets
JP5010240B2 (en) * 2006-11-02 2012-08-29 積水フイルム株式会社 Adhesive sheet for solar cell
DE102009011163A1 (en) * 2008-12-16 2010-07-08 Tesa Se Adhesive tape, in particular for bonding photovoltaic modules
KR20140132885A (en) * 2013-05-08 2014-11-19 엘지전자 주식회사 Solar cell module and edge tape used for the same
CN105838278A (en) * 2016-03-31 2016-08-10 太仓海润太阳能有限公司 Novel adhesive tape applicable to edge sealing of double-glass solar assembly
CN105957911B (en) * 2016-06-16 2018-01-09 常州天合光能有限公司 Solar components adhesive tape edge sealing laminating technology and its adhesive tape edge sealing instrument

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US20100163099A1 (en) * 2008-12-31 2010-07-01 E. I. Du Pont De Nemours And Company Solar cell modules comprising encapsulant sheets with low haze and high moisture resistance
CN106653905A (en) * 2017-01-03 2017-05-10 张家港协鑫集成科技有限公司 Laminate and preparation method thereof, double glass photovoltaic modulies and preparation method thereof

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