JPH08330610A - Solar cell module laminate film manufacturing apparatus and method - Google Patents

Abstract

PURPOSE: To reduce the raised edge and neck-in of a formed sheet by reducing the air gap between the top end of a slit nozzle of a T-die for extruding a molten sheet composed of a filler and the surface of a base film to a distance less than the thickness of the formed sheet. CONSTITUTION: An extruder 113 having a driver 100 the power of which is 2.2kW, L/D equal to 22 and screw diameter of 30mm is used and hanger type T-die 105 having a nozzle width of 300mm is used. With the rotation speed of a screw 102 set to 20rpm and filler's resin temp. set to 1000deg. C, a formed sheet is laminated on a base film 109. The relation of the air gap to the formed sheet's thickness is varied by changing the moving speed of the film 109. When the gap 112 is set to a value less than the thickness of the formed sheet, the raised edge and neck-in of the formed sheet can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for manufacturing a laminated film for solar cell module. More specifically, when forming a laminated film for a solar cell module, the thickness of the molded sheet is uniform, air entrainment is small, the melting temperature of the molded sheet can be lowered, and it is a kogation or lump of resin. The present invention relates to a manufacturing apparatus and a manufacturing method of a laminated film for a solar cell module having less slime.

[0002]

2. Description of the Related Art In recent years, there is a concern that global warming will occur due to the greenhouse effect caused by an increase in CO ₂ , and the demand for a clean energy source is increasing more and more.

Nuclear power generation is one of the clean energy sources that can meet such demands, but since a method for treating radioactive waste has not been established yet, it is desired to develop a more safe energy source. ing.

At present, solar cells are attracting attention as a clean and safe energy source. In particular, solar cells are lighter and more compact than other energy sources, and therefore have the characteristic of being easy to handle.

Among such solar cells, a thin film solar cell using amorphous silicon or copper indium selenide as a photoelectric conversion member can have a large area and can be manufactured at a low manufacturing cost. Therefore, they are enthusiastically researched in various fields.

As the substrate in this case, a metal substrate such as stainless steel which is lightweight, has high weather resistance and impact resistance, and is excellent in flexibility is often used.

Since such a metal substrate does not transmit sunlight, it is impossible to let light enter through the substrate as in the case of using a glass substrate. That is, it is necessary to allow sunlight to enter from the side of the photoelectric conversion member formed on the surface of the base. On the other hand, since the exposed photoelectric conversion member has a problem in terms of weather resistance and impact resistance, it is necessary to provide some kind of coating layer on at least the light incident side surface of the solar cell.

Conventionally, as the coating method, a pressure bonding method (method A) using a vacuum laminator is generally used even when a metal substrate is used, as in the case where a glass substrate is used. In this method A, a surface coating material, a solar cell element, and a back surface coating material are sequentially laminated on a metal plate having a heat source and sealed with an O-ring made of heat resistant rubber or the like and a sheet made of the heat resistant rubber or the like. After that, the inside of the solar cell element is vacuumed to coat the solar cell element with a desired material.

This method A is characterized in that the sheet is made of heat-resistant rubber and pressure-bonded at atmospheric pressure, so that pressure is applied relatively evenly to the irregularities of the solar cell element, and the irregularities have a substantially uniform thickness. It is a point that can be covered. However, in this method A, after cutting each of these coating materials into individual sheets, the solar cell module is superposed on the back surface coating material while aligning it, and a coating material composed of multiple layers is further placed thereon. The process of stacking is essential.

Therefore, in this method A, the following 3
There were two problems. (A) It takes time to cover the solar cell module. (B) Wrinkles, shifts, etc. occur in the covering material cut into single sheets. (C) Due to (b) above, in the coating material of the completed solar cell module, a portion where the coating material thickness is double and a portion where the desired coating material is absent are generated.

As a method for solving the above-mentioned three problems, for example, a method B in which a film in which each coating material layer is integrally laminated is supplied in a roll form and is thermocompression-bonded to a solar cell element is proposed.

FIG. 3 is a schematic sectional view showing an example of an apparatus used to carry out the method B. In addition, FIG.
FIG. 3 is a schematic view when viewed from above in FIG.

As shown in FIGS. 3 and 4, a T die (105) is connected to the extruder (113), and the resin melted by the extruder (113) is T
It is extruded into a film through the slit nozzle (106) of the die (105).

The film made of the melted resin, that is, the molded sheet is pressed by a backup roll (107) and a nip roll (108) so as to be sandwiched between the base film (109) and the surface film (110), A laminated film of layers is formed.

Further, without using the surface film (110),
It may be a laminated film composed of two layers of a base film (109) and a molded sheet. Further, in the case of producing a multi-layer laminated film, the above-mentioned three-layer laminated film is used as the base film (109).

Here, before sandwiching the molded sheet, the surfaces of the base film (109) and the surface film (110) in contact with the molded sheet are often surface-treated by a corona discharge treatment machine (not shown).

The above-mentioned conventional method has the following problems. (1) When pressure is applied by the backup roll (107) and the nip roll (108), air may be trapped due to pulsation of the extruder and fluttering of the molten film due to vibration of the device. Such air entrapment causes peeling in the coating of the solar cell.

(2) Adjustment of the thickness in the width direction is performed by the T-die (1
It is difficult to adjust the lip of the slit nozzle (106) of (05) by closing it with a bolt, and the variation is large. (3) Since it is difficult to adjust the thickness in the flow direction as in the width direction and the amount of extrusion varies, a gear pump (114) may be conventionally installed between the T die and the extruder. Such variations in thickness impair the stability of the insulation and moistureproof performance of the solar cell.

(4) The molten film extruded from the T-die is necked in (1) between the air gaps (112) until it comes into contact with the backup roll or the base film.
15) As a result, the width of the molten film shrinks, and thus this shrinkage becomes the ear height. Conventionally, this edge-height portion is cut off immediately after sheet formation (before winding). However, when the edge is removed, the filler may be squeezed out and stain the roller when the lamination of the heating roller is used in the coating of the solar cell.

(5) When the sheets are laminated and vacuum lamination is performed, the filler may also overflow. Moreover, the material yield is reduced by cutting. further,
This edge height becomes a spool shape by winding, and the laminated film is wrinkled. Then, when the solar cell is roll-laminated, the roll is unevenly hit, and the lamination is not uniform.

(6) In order to form a molten film, the melt viscosity of the resin must be lowered, and especially when the air gap is long, the neck-in becomes large and it is difficult to form a film, so the resin must be melted at a high temperature. (7) In coating of hot melt, solvent, emulsion, etc. at a viscosity of 100 cps to 1000 cps, there is a die-coater in which a gear pump is incorporated in a T-die (FIG. 7).
With a resin having a high viscosity of cps or more, bubbles cannot be left in the resin and a high thickness of 300 μm or more cannot be handled.

[0022]

DISCLOSURE OF THE INVENTION The present invention solves the problem of bubbles due to air entrainment, variation in thickness in the width direction, adjustment of thickness in the flow direction, ear height, and increase in molding temperature, resulting in high quality. An object of the present invention is to provide an apparatus and a method for manufacturing a laminated film for a solar cell module, which can produce a laminated film with high productivity.

[0023]

The apparatus for producing a laminated film for a solar cell module of the present invention comprises a semiconductor layer as a photoelectric conversion member formed on the surface of a conductive substrate, and a transparent conductive film on the surface of the semiconductor layer. The front surface and the back surface of the solar cell module composed of the solar cell element in which the layer is formed,
When covered with a front surface coating material and a back surface coating material made of a laminated film, the laminated film is a structure in which a resin film forming a surface film and a base film and a molded sheet made of a filler are alternately laminated. In a device for manufacturing a laminated film for a module, a molten sheet of the filler forming the molded sheet is discharged T
The distance between the tip of the slit nozzle of the die and the surface of the resin film, that is, the air gap, is less than or equal to the thickness of the molded sheet. Further, the angle of incidence of the molten sheet on the backup roll is in the range of 60 degrees or more and 120 degrees or less with respect to the tangent line at the incidence point. Further, when the filler passes through a slit provided inside the T-die, a gear pump is arranged at a position where the slit width becomes maximum.

In the method for producing a laminated film for a solar cell module of the present invention, the air gap is variably controlled below the thickness of the molded sheet by sequentially sensing the thickness of the molded sheet and the air gap. It is characterized by being done. Further, the angle of incidence of the molten sheet on the backup roll is variably controlled within the range of 60 degrees or more and 120 degrees or less with respect to the tangent line at the incidence point. Further, the delivery amount of the filler by the gear pump is variably controlled.

[0025]

According to the first aspect of the present invention, the distance between the tip of the slit nozzle of the T die for discharging the molten sheet of the filler and the surface of the base film, that is, the air gap, is less than or equal to the thickness of the molded sheet. Therefore, the ear height and neck-in of the formed sheet could be reduced. As a result, it was found that the variation in thickness in the width direction can be reduced.

According to the second aspect of the present invention, the angle of incidence of the molten sheet on the backup roll is in the range of 60 degrees to 120 degrees with respect to the tangent line at the incident point. Therefore, variation in thickness in the flow direction is reduced. As a result, it is possible to prevent the generation of bubbles due to the entrainment of air. It was also found that the melting temperature can be lowered because the high-viscosity material can be formed into a sheet.

According to the third aspect of the invention, when the filler passes through the slit provided inside the T-die, the gear pump is arranged at the position where the slit width becomes maximum, so that the molded sheet A uniform resin flow is formed in the entire width direction. As a result, variation in thickness in the width direction is reduced, and kogation of resin and slime as a lump can be reduced. Moreover, since the flow rate of the resin can be controlled, the thickness of the molded sheet can be easily regulated.

According to the invention of claim 4, the air gap is variably controlled below the thickness of the molding sheet by successively sensing the thickness of the molding sheet and the air gap. It is possible to cope with changes in temperature and humidity of the atmosphere in which the manufacturing device for a laminated film for a solar cell module is placed. As a result, it is possible to prevent the height of the formed sheet and the neck-in from occurring unattended even during continuous production.

According to the invention of claim 5, the angle of incidence of the molten sheet on the backup roll is variably controlled within the range of 60 to 120 degrees with respect to the tangent line at the incident point. It is possible to cope with changes in temperature and humidity of the atmosphere in which the laminated film manufacturing apparatus is placed. As a result, it is possible to prevent the generation of bubbles due to the entrainment of air even during continuous production. Further, the thickness in the flow direction can be stably obtained regardless of the temperature change of the melted resin.

According to the sixth aspect of the invention, the amount of the filler fed by the gear pump is variably controlled, whereby the ambient temperature and humidity fluctuate during the production of the molded sheet, and the surface condition of the base film changes. However, it is possible to prevent slime generation.

[0031]

[Example embodiment]

(Manufacturing Device for Laminated Film for Solar Cell Module) As a manufacturing device for a laminated film for a solar cell module according to the present invention, for example, the one shown in FIG. 1 can be mentioned. FIG. 2 is a schematic view of FIG. 1 when viewed from above in the drawing.

In FIG. 1, 100 is a drive motor,
101 is a hopper, 102 is a screw, 103 is a cylinder, 104 is a flexible hose, 105 is a T-die, 106 is a slit nozzle, 107 is a backup roll, 108 is a nip roll, 109 is a base film, 110 is a surface film, and 111 is an incident angle. , 112 are air gaps.

Hereinafter, each of the above constituent parts will be described. (Surface film) Surface film 110 in the present invention
Is a resin film or a laminated film composed of a resin film and a filler, and is supplied in a roll form.

The resin film is required to be a material that transmits light in order to allow light to enter the solar cell element. From this viewpoint, examples of the material of the resin film include ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), silicone resin, epoxy resin, acrylic resin, and fluororesin. Further, these resins include a cross-linking agent and a thermal antioxidant for increasing heat resistance, an ultraviolet absorber and a photo-oxidizing agent for improving light stability and weather resistance, and an adhesive for increasing adhesive strength. A silane coupling agent or a titanate coupling agent may be added in some cases.

The resin film layer located on the outermost surface of the surface film has a surface contact angle of water of 70 degrees or more in order to prevent the solar cell module from being contaminated by rain or the like and its output being lowered. It is preferably a resin. That is, it is preferably transparent, has excellent weather resistance, and has a certain degree of mechanical strength. Examples of the resin film having such characteristics include a fluorine resin film. Examples of the material forming the fluororesin film include tetrafluoroethylene-ethylene copolymer (ETFE) and trifluoroethylene chloride (PCTF).
E), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), vinylidene fluoride resin (PVDF), vinyl fluoride resin (PVF) Etc.

(Base Film) The base film 109 in the present invention is a resin film, or a laminated film composed of a resin film and a filler, like the above-mentioned surface film 110, and is supplied in a roll form. .

The resin film in the base film 109 does not need to transmit light and may be opaque. Therefore, as the filler in the base film 109, a filler different from that in the surface film may be used.

However, when the difference in the coefficient of thermal expansion between the surface film and the base film is large, the solar cell module may be warped. Therefore, the resin films constituting the surface film and the base film are the same resin. Is preferably used. Further, it is preferable to use the same filler as the filler constituting the surface film and the base film for the same reason.

However, when the solar cell element formed on the conductive substrate is covered, an insulating film is used as the resin film forming the base film because it is necessary to perform more complete insulation. Examples of the material of this insulating film include nylon, polyethylene, polyester, polystyrene and the like. The insulating film may be opaque.

(Filler) The filler of the present invention is required to have at least an adhesive force for favorably adhering the resin film and the solar cell element. Further, it is preferable that the filler is easily filled in the uneven shape on the surface of the solar cell element. Furthermore, when an intermediate hard film, a glass woven nonwoven fabric, or the like is sandwiched between the solar cell element and the surface film 110 and laminated, the adhesive force between the intermediate hard film and the glass woven nonwoven fabric is also required. Also, thermoplasticity, scratch resistance, nonflammability, shock absorption, heat resistance,
It is desirable that it is also excellent in moisture resistance and weather resistance.

(Layered film for solar cell module covered by a surface film and a base film via a molded sheet made of filler) As shown in FIG. 1, the laminated film for solar cell module is a filler. In the case of a three-layer structure or more in which a surface film and a base film are sandwiched via a molded sheet consisting of, the filler may be first laminated on the base film 109, or on the surface film 110. It may be laminated on.

On the other hand, when the laminated film for a solar cell module has a two-layer structure composed of a molded sheet made of a filler and a surface film, the filler is first laminated directly on the backup roll 107 and then the surface film. 110
May be laminated, or may be laminated on the surface film 110 from the beginning.

(Flexible hose) T in the present invention
Flexible hose 1 that connects the die and extruder
04 is necessary to freely set the incident angle 111. In particular, it is preferable to have a heat retaining or heating mechanism in order to keep the temperature of the filler passing through.

(Extruder) The extruder 113 in the present invention may be a commercially available device. The diameter of the cylinder 103 and the L / D of the screw 102 depend on the temperature, viscosity, and discharge amount of the filler used, the presence or absence of additives, and the kneading property.
The value, the capacity of the drive 100, the number of axes, etc. are appropriately determined.

[0045]

EXAMPLES The present invention will be described in detail below based on examples. The present invention is not limited to these examples.

Example 1 In this example, the surface coating material and the back surface coating material were formed by changing the magnitude relationship between the air gap and the thickness of the molded sheet. The surface coating material has a four-layer structure and the back surface coating material has a two-layer structure.

At this time, the apparatus shown in FIGS. 3 and 4 was used. The incident angle, that is, the angle at which the molten sheet of the filler forming the molded sheet is incident on the backup roll was fixed at 30 degrees. The position x where the gear pump is installed is
The inside of the flexible hose near the T-die (position D, width d of the space in which the filler flows) was set. That is, the relationship of d = 0.9a is set with respect to the position A (width a of the space in which the filler flows) where the maximum slit width is obtained in the T die.

The constituent members of the laminated film for a solar cell module of this example will be described below with reference to FIGS. 3 and 4. (A) As the resin film in the surface film 110, ETFE (manufactured by Asahi Glass, which is a fluorine-based resin film,
The product name Aflex, thickness 50 μm) was used. FIG.
The surface film 110 shown in (1) was subjected to a corona discharge treatment (not shown) on one surface to which the filler was pasted, before being wound around the nip roll 108 from the upper left of the drawing.

(B) As a resin film in the base film 109, a polycarbonate film (trade name: Iupilon thickness 100 μm, manufactured by Mitsubishi Gas Chemical Co., Inc.), which is a hard film, was used. The base film 109 shown in FIG. 1 was subjected to corona discharge treatment (not shown) on one surface on which the filler was laminated before being wound around the backup roll 107 from the lower left of the drawing. (C) As the filler, EVA (manufactured by Mitsui DuPont Polychemical, trade name EVAflex EV150P) was used.

The method for producing the surface coating material which is the laminated film for solar cell module of this example will be described below. (1) As the extruder 113, the capacity of the driving unit 100 is 2.2 kw, the L / D is 22, and the screw diameter is 30 mm.
I used the one. However, as the T die 105, as shown in FIG.
A hanger type having a nozzle width of 0, which is 300 mm, was used.

(2) The rotation speed of the screw 102 is 20 r
pm, and the resin temperature of the filler was 100 ° C. (melt viscosity 50000 poise), and a molded sheet of the filler was laminated on the base film 109. The magnitude relationship between the air gap 112 and the thickness of the formed sheet was changed by changing the moving speed of the base film 109.
For example, when the thickness of the molded sheet is 300 μm,
The moving speed of the base film 109 was 1 m / min.

(3) The nip roll 1 is placed on the molded sheet made of the filler provided on the base film 109.
08 was used to laminate the surface film 110 to form a laminated film having a three-layer structure. (4) A laminated film having the above three-layer structure was used instead of the base film 109, and a molded sheet made of the fourth layer filler was produced on the base film 109 that forms the laminated film. At this time, no surface film was used. Through the above steps, a surface coating material having a four-layer structure was obtained.

Further, a method for producing the back coating material, which is the laminated film for solar cell module of this example, will be described below. (5) Nylon (made by DuPont, product name Dartec Thickness 75, which serves as a back insulating film, as a base film
μm) was used to perform a single-sided corona discharge treatment, and then a filler was laminated on the corona-discharge treated surface. Various setting conditions at that time were the same as those in the case of forming the surface coating material.
As a result, a back coating material having a two-layer structure was obtained.

FIG. 6 is a schematic view showing the cross-sectional structure of each of the front surface coating material and the back surface coating material produced by the above steps. It was confirmed that bubbles 119 were generated in the vicinity of the ear height in the surface covering material.

FIG. 9 is a graph summarizing the variations in the thickness of the molding sheet made of each filler in the surface coating material and the back surface coating material produced by the above process. The horizontal axis is a value obtained by subtracting the value of the molded sheet thickness from the value of the air gap. The vertical axis shows variations in the thickness of the molded sheet (α-β)
Is. However, α and β are numerical values defined as follows.

Α: Thickness of the molded sheet at a position 20 mm from the end of the surface coating material and the back surface coating material in the center direction β: Thickness of the molded sheet at the center position in the width direction of the surface coating material and the back surface coating material From FIG. 11, when the air gap was set to be equal to or less than the thickness of the formed sheet, a formed sheet having no ear height as shown in FIG. 5 was obtained. As a result, it was possible to reduce variations in the thickness of the formed sheet in the width direction. At the same time, it was also confirmed that the occurrence of neck-in disappeared.

Example 2 This example is different from Example 1 in that the incident angle was changed in the range of 20 degrees to 160 degrees. At this time, the air gap was fixed to the thickness of the molded sheet or less. The other points were the same as in Example 1.

FIG. 10 is a graph summarizing the number of bubbles generated in the surface coating material and the back surface coating material due to the entrainment of air. The horizontal axis represents the incident angle, and the vertical axis represents the number of bubbles generated, which is a value normalized by the number of bubbles generated when the incident angle is 90 degrees.

From FIG. 12, it was found that when the incident angle was 60 degrees or more and 120 degrees or less, the number of bubbles generated had a minimum value. Also, because high clay materials can be made into sheets,
It was also separately confirmed that the melting temperature could be lowered.

(Embodiment 3) This embodiment is different from Embodiment 1 in that the position x where the gear pump is installed is changed by using the apparatus shown in FIGS. Position where gear pump is installed x
As the above, four types of positions A to D shown below were examined. In the apparatus shown in FIGS. 1 and 2, the air gap was fixed to the thickness of the molded sheet or less and the incident angle was fixed to 90 degrees.

Position A: Position where the maximum slit width is obtained in the T die (a: Width of space in which filler flows at position A) Position B: b = 0.9a (b: filler at position B is Width of flowing space) Position C: c = 0.5a (c: Width of space where filling material flows at position C) Position D: d = 0.1a (d: Width of space where filling material flows at position D)

FIG. 7 is an enlarged view of the vicinity of the gear pump in FIG. FIG. 8 is a sectional view of a portion yy 'in FIG. The position D is a position where the width of the space in which the filler flows is the smallest. On the contrary, the position A indicates the position where the width of the space in which the filler flows is the maximum. The other points were the same as in Example 1.

FIG. 11 is a graph summarizing the number of slimes contained in the molded sheet made of each filler in the surface coating material and the back surface coating material produced by the above process. The horizontal axis is the position x where the gear pump is installed. The slime number on the vertical axis is a value normalized by the average value of the slime numbers observed when the gear pump is installed at the position D, and the average value of 100 sets of the surface coating material and the back surface coating material at each position. , Maximum and minimum values are shown.

From FIG. 11, it was found that when the position x where the gear pump is installed is set to the position A, that is, the position where the maximum slit width is obtained in the T die, the number of slimes is minimized.

FIG. 5 is a schematic view showing the cross-sectional structure of each of the surface coating material and the back surface coating material produced at the position A. From FIG. 5, it was confirmed that the ear-height portion was not generated in the front surface coating material and the back surface coating material, and almost no bubbles were generated.

(Embodiment 4) In this embodiment, the thickness and air gap of the molded sheet are sequentially sensed,
It differs from the first embodiment in that an automatic control mechanism is provided so that the air gap is equal to or less than the thickness of the molded sheet. The other points were the same as in Example 1.

As a result, it was found that during continuous production, even when the temperature and humidity changed, the occurrence of ear height could be prevented, and the variation in thickness in the width direction of the formed sheet could be reduced. At the same time, it was also confirmed that the occurrence of neck-in disappeared.

(Embodiment 5) In this embodiment, an automatic control mechanism is provided which can maintain the angle of incidence of the molten sheet on the backup roll within the range of 60 to 120 degrees with respect to the tangent line at the incident point. Different from Example 1. Other points are
Same as Example 1.

As a result, it was found that the number of bubbles generated by the entrainment of air can be reduced even when the temperature and humidity change during continuous production. Further, it was possible to reduce the variation in the thickness in the flow direction of the molded sheet made of the filler.

(Embodiment 6) This embodiment is different from Embodiment 1 in that an automatic control mechanism capable of varying the amount of the filler to be fed by the gear pump is provided. The other points were the same as in Example 1.

As a result, it was found that slime does not occur even if the ambient temperature and humidity fluctuate during the production of the molded sheet and the surface condition of the base film changes.

[0072]

As described above, according to the first aspect of the present invention, it is possible to prevent the occurrence of ear height, reduce the variation in the thickness in the width direction of the formed sheet, and cause the neck-in. An apparatus for producing a laminated film for a solar cell module that can be avoided is obtained.

According to the second aspect of the present invention, there is provided an apparatus for manufacturing a laminated film for a solar cell module, which can reduce the number of bubbles generated due to the entrainment of air.

According to the third aspect of the invention, there is provided an apparatus for producing a laminated film for a solar cell module in which slime is not generated.

According to the invention of claim 4, it is possible to prevent the occurrence of ear height, reduce the variation in thickness in the width direction of the molded sheet, and avoid the occurrence of neck-in. A method for producing a laminated film for use is obtained.

According to the invention of claim 5, there is provided a method of manufacturing a laminated film for a solar cell module, in which the number of bubbles generated due to air entrainment can be reduced.

According to the invention of claim 6, there is provided a method for producing a laminated film for a solar cell module in which slime is not generated.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a manufacturing apparatus according to the present invention.

2 is a schematic cross-sectional view of the manufacturing apparatus of FIG. 1 viewed from above.

FIG. 3 is a schematic sectional view of a manufacturing apparatus according to a conventional example.

4 is a schematic cross-sectional view of the manufacturing apparatus of FIG. 3 viewed from above.

FIG. 5 is a schematic cross-sectional view of a four-layer surface coating material and a two-layer back surface coating material according to the present invention.

FIG. 6 is a schematic cross-sectional view of a four-layer surface coating material and a two-layer back surface coating material according to a conventional example.

FIG. 7 is a schematic cross-sectional view of the vicinity of the gear pump in FIG.

8 is a cross-sectional view of a portion yy 'in FIG.

FIG. 9 is a graph summarizing the variation in thickness of the molded sheet according to Example 1 of the present invention.

FIG. 10 is a graph summarizing the number of bubbles generated according to the second embodiment of the present invention.

FIG. 11 is a graph summarizing the slime numbers according to the first embodiment of the present invention.

[Explanation of symbols]

 100 drive machine, 101 hopper, 102 screw, 103 cylinder, 104 flexible hose, 105 T die, 106 slit nozzle, 107 backup roll, 108 nip roll, 109 base film, 110 surface film, 111 incident angle, 112 air gap, 113 extrusion Machine, 114 gear pump, 115 neck-in, 116 filler, 117 insulating film, 118 ear height, 119 bubbles.

Claims (6)

[Claims] 1. A surface of a solar cell module comprising a solar cell element in which a semiconductor layer as a photoelectric conversion member is formed on the surface of a conductive substrate, and a transparent conductive layer is formed on the surface of the semiconductor layer. When the back surface is covered with a surface covering material and a back surface covering material made of a laminated film, the laminated film is a structure in which a resin film forming a surface film and a base film and a molding sheet made of a filler are alternately laminated. In a manufacturing apparatus for a laminated film for a solar cell module, the distance between the tip of the slit nozzle of the T die that discharges the molten sheet of the filler forming the molding sheet and the surface of the resin film, that is, the air gap is An apparatus for producing a laminated film for a solar cell module, which has a sheet thickness or less. 2. The angle of incidence of the molten sheet on the backup roll is in the range of 60 degrees or more and 120 degrees or less with respect to the tangent line at the incidence point.
An apparatus for manufacturing a laminated film for a solar cell module according to. 3. A slit provided inside the T-die,
The apparatus for manufacturing a laminated film for a solar cell module according to claim 1 or 2, wherein a gear pump is arranged at a position where the slit width is maximum when the filler passes through. 4. When the apparatus for manufacturing a laminated film for a solar cell module according to any one of claims 1 to 3 is used, by successively sensing the thickness of the molded sheet and the air gap, The method for producing a laminated film for a solar cell module, wherein the air gap is variably controlled within a thickness of the molded sheet. 5. The solar cell module according to claim 4, wherein the incident angle of the molten sheet on the backup roll is variably controlled within a range of 60 degrees to 120 degrees with respect to a tangent line at the incident point. For manufacturing laminated film for automobile. 6. The method for manufacturing a laminated film for a solar cell module according to claim 4, wherein the amount of the filler delivered by the gear pump is variably controlled.