KR101284928B1 - Coating device and coating method using the same - Google Patents

Abstract

The present invention relates to a coating booth comprising a coating booth, a vertical drying oven and a coating object transfer part, a coating method using a vertical drying oven, and a method of manufacturing a solar cell backsheet using the coating method. Since the coating object is dried through a drying oven, the entire surface of one or both surfaces of the coating object may be uniformly and quickly coated. Therefore, the thermal deformation of the coating object can be minimized, the coating process can be simplified, and the cost of the coating process can be reduced.

Coating equipment, coating oven, drying

Description

Coating device and coating method using the same {COATING DEVICE AND COATING METHOD USING THE SAME}

The present invention relates to a coating apparatus and a coating method using the same. More specifically, the present invention relates to a coating apparatus and a coating method using the same, which can minimize thermal deformation of a coating object, simplify the coating process, and reduce the cost of the coating process.

In general, the coating process uses a coating method such as roll coating, spray coating, slot die coating, flow coating, and dip coating to apply a coating liquid to the surface of the coating object, and to dry the coating liquid on the surface of the coating object. It proceeds by cooling.

The drying process in the coating process is a method of drying the coating liquid on the surface of the coating object while continuously moving the coating object in the horizontal direction in a dryer having a structure extending in the horizontal direction.

Therefore, in the case of coating on both sides of the coating object, the coating liquid is first applied to only one surface of the coating object, dried and cooled, and then the coating liquid is applied to the other surface where the coating liquid is not applied, and then dried and cooled again. Proceed.

In addition, the drying process of the conventional coating process is a heat treatment process, and a boiler is provided outside the dryer, and a heat exchanger is installed inside the dryer to circulate a heat medium such as steam or air supplied from the boiler to the heat exchanger. By operating, a method of drying the coating liquid on the surface of the coating object by the heat dissipated by the heat exchanger is used.

However, since this coating process is performed twice, the coating, cooling and drying process is low, the efficiency of the process is low, the enormous heat loss occurs in the process of supplying the heat medium generated from the boiler to the dryer, and the amount of fuel used is very large However, there is a problem that the cost of the coating process increases and causes environmental pollution.

As an example of applying a drying process by heat treatment, there is a back sheet manufacturing process of a solar cell.

Since the solar cell back sheet requires various properties such as weather resistance, durability, processability, and insulation, it is manufactured from a sheet having a multilayer structure having various performances. For example, the solar cell backsheet of a multilayer structure is manufactured by the method of forming the resin layer which has durability, weather resistance, etc. in at least one surface of a base material layer. At this time, the resin layer of the solar cell back sheet is formed by a method of preparing a fluorine-based resin in a resin coating solution and coating the base layer.

In the manufacturing process of such a solar cell back sheet, since various functional coating layers such as resin layers are formed on both sides of the base layer, when a general coating process and a heat treatment process are applied, the coating, cooling and drying processes are performed twice. There is a problem that increases the manufacturing cost of the battery back sheet, and may lower the productivity and quality of the solar cell back sheet.

Therefore, there is an urgent need for a coating apparatus and a coating method capable of increasing the efficiency of the coating process, reducing the manufacturing cost of the solar cell back sheet, and manufacturing the solar cell back sheet with excellent quality and productivity. .

An object of the present invention is to increase the efficiency of the coating process, to reduce the manufacturing cost of coating products such as solar cell back sheet, and to manufacture coating products such as solar cell back sheet or copper clad laminate with excellent quality and productivity. It is to provide a coating apparatus and a coating method using the same.

In order to solve the above problems, the present invention provides a coating apparatus for applying a coating liquid on the surface of the coating object, 1) a coating booth to impregnate the coating object in the coating liquid to perform coating on at least one surface of the coating object; 2) a vertical drying oven for drying the coating liquid on the surface of the coating object while moving the coating object passing through the coating booth in the vertical upper direction or the vertical lower direction; And 3) to provide a coating device comprising a coating object transporting portion for supporting or fixing the coating object to continuously pass through the coating booth and vertical drying oven.

Since the coating apparatus of the present invention dries the coating object by using a vertical drying oven, after coating the coating liquid on one or both surfaces of the coating object, the coating process is performed through one drying process. Since the cooling process can be performed continuously, enormous heat loss occurs, which is a disadvantage of the coating apparatus using a general horizontal drying oven, and the amount of fuel used is very large, which increases the cost of the coating process and causes environmental pollution. I can solve it.

The present invention also comprises the steps of 1) preparing a coating object; 2) performing coating on both sides by impregnating the coating object into the coating liquid; 3) drying the coating object coated with the entire surface while moving in a vertical upper direction or a vertical lower direction using a vertical drying oven; And 4) provides a coating method comprising the step of cooling the coating object passed through the vertical drying oven.

The present invention also provides a method for manufacturing a solar cell backsheet including the coating method.

The present invention also provides a method for producing a copper clad laminate comprising the coating method.

According to the present invention, it is possible to maximize the efficiency of the coating process, to reduce the process cost, and to manufacture a coating product such as a solar cell back sheet having excellent productivity and quality.

Hereinafter, the present invention will be described in detail.

Coating apparatus according to the present invention is a coating apparatus for applying a coating liquid on the surface of the coating object, 1) a coating booth to impregnate the coating object in the coating liquid to perform coating on at least one surface of the coating object; 2) a vertical drying oven for drying the coating liquid on the surface of the coating object while moving the coating object passing through the coating booth in the vertical upper direction or the vertical lower direction; And 3) a coating object conveying part for supporting or fixing the coating object to continuously pass the coating booth and the vertical drying oven.

According to the method of the present invention, after coating the coating liquid on one or both sides of the coating object, the coating process is performed through one drying process, so that the same horizontal coating process, the drying process and the cooling process are performed twice each. Compared with the coating process using a drying oven, it is possible to increase the efficiency of the coating process, to reduce the process cost, and to manufacture a solar cell back sheet having excellent productivity and quality.

The coating object transfer part is not particularly limited as long as it has a configuration to smoothly introduce the coating object into the coating device to be discharged to the outside of the coating device.

For example, the coating object transfer unit is a roller device including an unwinder roll, a winder roll, and a guide roll, and includes an unwinder roll, a coating booth, a vertical drying oven, and a winder. The rolls are arranged sequentially and one or more guide rolls are selected from the group consisting of the position between the unwinder roll and the coating booth, the interior of the coating booth, the position between the coating booth and the vertical drying oven and the position between the vertical drying oven and the winder roll. It may be formed of a coating apparatus, characterized in that arranged in one or more positions.

The unwinder roll serves to release the wound coating object and introduce it into the coating apparatus while rotating the roller in a state in which a coating object having a long sheet and film shape is wound on the roller, and the winder roll is formed in the unwinder roll. By unwinding the coated object passed through the coating apparatus with a roller, the coating process can be carried out continuously.

When the unwinder roll, the coating booth, the vertical drying oven and the winder roll are sequentially arranged, specifically, the unwinder roll and the coating booth are arranged side by side in the horizontal direction, and the coating booth and the vertical drying oven are in the vertical direction. Side by side, the vertical drying oven and the winder roll may be arranged side by side in the horizontal direction.

The coating booth is not particularly limited as long as the coating booth includes a device or a facility for applying a coating solution to the surface of the coating object. The coating booth may be displayed outside the coating apparatus by measuring the viscosity of the coating solution in addition to the coating solution, or by measuring the viscosity of the coating solution. Coating liquid viscosity control device for performing a function such as controlling the viscosity of the coating layer, the coating layer thickness control device for performing a function such as measuring the thickness of the coating layer to the outside of the coating device or adjusting the thickness of the coating layer may be further included. have.

For example, the coating booth may include a resin bath as a coating liquid viscosity and coating layer thickness adjusting device and a metering roll as a thickness measuring device of the coating layer.

The resin impregnation tank is an impregnation tank that is provided with a function of temperature control, addition of a solvent or an additive, so as to adjust the viscosity of the coating liquid in the impregnating tank in which the resin coating liquid is loaded, and apply a coating liquid to one or both sides of the coating object, and a coating layer. It serves to adjust the thickness of the, the metering roll serves to measure the thickness of the coating layer, so as to adjust the thickness of the coating layer and the viscosity of the coating liquid.

The vertical drying oven may further include a cooling unit for cooling the coating object, the coating booth, the vertical drying oven and the cooling unit may be made of a structure that is sequentially disposed.

Specifically, the cooling unit may be connected to one end of the vertical drying oven not adjacent to the coating booth in a vertically continuous structure, or may be formed in a horizontally connected structure.

The cooling unit may be, for example, in the form of a cooling booth that can control the cooling temperature, time and state. That is, the cooling unit is not particularly limited in the cooling temperature and cooling rate, but the configuration to adjust the cooling conditions such that the deformation of the coating film such as wrinkles due to the rapid shrinkage of the film when the high temperature coating film is wound on a low temperature roll Can be formed.

The vertical drying oven is a structure extending vertically, if the oven can be dried while moving the coating object in the vertical upper direction or vertical lower direction is not particularly limited. However, in order to facilitate the adjustment of the drying temperature, it is preferable to use a vertical drying oven having a structure in which at least two or more drying sections are formed in the vertical direction and have different drying temperatures.

The preferred drying temperature in the vertical drying oven is 100 to 250 ℃, drying time is 1 to 10 minutes, the moving speed of the coating object may be made of 5m / min to 50m / min.

The vertical drying oven may be formed in a structure in which another vertical drying oven is added to the cooling unit in consideration of the efficiency of the coating process and the quality of the coating object.

For example, the vertical drying oven may be formed in a structure in which at least two vertical drying ovens are arranged in parallel to each other.

Since the length or height of the vertical drying oven can be freely adjusted by the configuration in which the vertical drying ovens are arranged in parallel, the overall space utilization in the coating apparatus can be increased. That is, when the vertical drying oven of 40m length is required in the coating apparatus, by placing two 20m vertical drying oven in parallel, it is possible to increase the overall space utilization of the vertical drying oven. However, in this case, the end of each vertical drying oven, that is, the portion where the coating object is bent takes a lot of tension of the roll (roll) and the problem that the high temperature film passing through the vertical drying oven may adhere to the roll, In order to prevent the coating object is bent portion it is preferable that the cooling unit is further formed.

In detail, when the vertical drying oven is a vertically upward drying oven, a vertically downward drying oven is further connected to the cooling unit, and the coating object is the vertically upwardly drying oven, a cooling unit and a vertically downwardly drying oven. It can be formed in a structure that passes sequentially.

In addition, when the vertical drying oven is a vertical bottom drying oven, a vertical upper drying oven is further connected to the cooling unit, and the coating object is the vertical lower vertical drying oven, a cooling unit and a vertical upper drying oven. It can be formed in a structure that passes sequentially.

The coating apparatus may further include a pretreatment unit for pretreatment before coating the coating liquid on the surface of the coating object and a post treatment unit after coating and drying the coating liquid in addition to the coating object transfer unit, the introduction unit and the coating booth.

For example, the coating apparatus may further include a pretreatment unit and a post-treatment unit, and the pretreatment unit, the coating booth, the vertical drying oven, and the post-treatment unit may be sequentially disposed.

In this case, the pretreatment unit and the post-treatment unit may perform a variety of pre-treatment and post-treatment according to the quality, use and performance of the coating product, for example, plasma on the surface of the coating object and the surface of the coated coating object, respectively. Plasma treatment, corona treatment and primer treatment may be performed.

In one preferred example, the coating object coated by the coating apparatus is a base layer film of the solar cell back sheet, the coating liquid may be a resin composition containing a fluorine-based resin.

The solar cell back sheet is a sheet used for the packaging of solar cells, and is coated with a fluorine-based resin having excellent processability, durability, and weather resistance on the base layer film to provide functionality such as durability and weather resistance. Are manufactured.

Conventionally, when forming a fluorine-based resin layer in order to manufacture a solar cell back sheet of a multi-layer structure, by applying a resin layer coating liquid to one surface of the substrate layer, and drying and cooling, the resin layer coating liquid is applied to the other surface of the substrate layer to dry and Since cooling, by repeating the same process twice, there is a problem that the efficiency of the process is lowered and the manufacturing cost of the solar cell back sheet is increased. In addition, the thermal deformation of the substrate layer may be induced during two drying processes, thereby degrading the quality of the solar cell backsheet.

However, in the present invention, by using the coating apparatus, by forming a fluorine-based resin layer of the solar cell back sheet, the non-uniformity of the thickness of the resin layer due to the flow of the resin coating liquid and the like during the resin layer formation process on both sides of the base layer and the solar cell The degradation of the backsheet can be prevented.

When the fluorine-based resin layer of the solar cell backsheet is formed using the coating apparatus, the fluorine-based resin is preferably a resin containing a polyvinylidene fluoride (PVDF) copolymer, and as a comonomer, hexafluoropropylene ( HFP) or a resin containing a polyvinylidene fluoride (PVDF) -based copolymer containing 5 to 50% by weight of chlorotrifluoroethylene (CTFE).

Resin and comonomer comprising the polyvinylidene fluoride (PVDF) -based copolymer, polyvinylidene fluoride (PVDF) containing 5 to 50% by weight of hexafluoropropylene (HFP) or chlorotrifluoroethylene (CTFE) The resin containing the) -based copolymer is excellent in solubility in solvents and can be dried even at a low temperature of 200 ° C. or less, thereby minimizing thermal deformation of the solar cell backsheet base layer and reducing the manufacturing cost of the solar cell backsheet. There is an advantage to reduce.

The comonomer is tetrafluoroethylene (TFE), trifluoroethylene, hexafluoroisobutylene, perfluorobutyl ethylene, perfluoro in addition to hexafluoropropylene (HFP) or chlorotrifluoroethylene (CTFE) Propyl vinyl ether (PPVE), perfluoro ethyl vinyl ether (PEVE), perfluoro methyl vinyl ether (PMVE), perfluoro-2,2-dimethyl-1,3-diosol (PDD) and perfluoro 2-methylene-4-methyl-1,3-dioxolane (PMD) and the like can also be used.

Specifically, the coating liquid of the resin composition containing the fluorine-based resin is a polyvinylidene fluoride (PVDF) -based copolymer containing hexafluoropropylene (HFP) or chlorotrifluoroethylene CTFE as a comonomer, titanium oxide (TiO ₂ ), Silica, alumina, calcium carbonate, fillers such as barium sulfate, acetone, methyl ethyl ketone (MEK), dimethylformamide (DMF) and dimethylacetamide (DMAC) Alternatively, by preparing a coating solution containing two or more kinds of mixed solvents, various properties such as durability, weather resistance, adhesiveness, and processability required for the resin layer of the solar cell back sheet can be imparted to the resin layer.

In addition, the resin layer may further include at least one of methyl methacrylate (MMA) and glycidyl methacrylate (GMA) as an additive so as to improve the adhesion to the substrate layer and mechanical properties. . In addition, polymers comprising at least one of methyl methacrylate (MMA), glycidyl methacrylate (GMA) and cyclohexylmaleimide (CHMI), such as polymethyl methacrylate (PMMA), methyl methacrylate And a copolymer of glycidyl methacrylate (MMA-GMA), a copolymer of methyl methacrylate and cyclohexylmaleimide (MMA-CHMI) may be further included.

Drying of the resin layer can determine the appropriate temperature and time to those skilled in the art at a temperature of 200 ℃ or less. In this invention, it is more preferable that drying temperature is 100 degreeC or more and 180 degrees C or less, 1 minute-30 minutes are preferable, and 3 minutes-10 minutes are more preferable.

When the drying temperature of the resin layer exceeds 200 ℃, since the high temperature drying equipment of more than 200 ℃ must be used, the manufacturing cost is increased, thermal deformation of the base layer to be described later is induced to increase the productivity and quality of the solar cell back sheet There is a problem that is significantly reduced.

In this case, it is preferable to use a polyester-based resin layer as the base layer, specifically, it can be formed from polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), etc. Preferably, it may be formed using polyethylene terephthalate (PET).

In addition, the base layer of the solar cell backsheet may use a variety of materials according to the physical properties required for the solar cell backsheet, for example, polyethylene terephthalate deposited with a metal such as copper, aluminum or silica Inorganic vapor deposition polymer films such as (PET) can also be used as the substrate.

In another preferred example, the coating object is a metal-clad laminate (copper-clad laminate), the coating device may be used for the manufacture of a metal foil laminate used for the back sheet of the thin-film solar cell.

For example, after the adhesive is applied to one surface of the substrate layer film and a metal foil having a thickness of 5 to 40 μm is adhered, the both surfaces are coated with a fluorine-based resin and then dried at a temperature of approximately 100 to 200 ° C. in a vertical drying oven. Resin-coated metal laminate can be prepared.

Specifically, the coating apparatus is to produce a multi-layer aluminum laminate plate coated with fluorocarbon resin on both sides using a flexible aluminum laminate produced by forming an adhesive layer and aluminum foil on a base layer film such as polyimide or polyester. Can be. Such a metal laminate may be used as a back sheet of a thin film solar cell because the metal foil has excellent moisture / oxygen barrier property.

The drying temperature of the vertical drying oven can be set to a variety of temperature range depending on the type and application of the coating object, more preferably less than 500 ℃, more preferably between 100 to 200 ℃ Can be set to a range.

If the drying temperature is 500 ℃ or more, the coating object formed of the polymer resin may be thermally deformed. If the drying temperature is less than 100 ℃, the coating liquid is incompletely dried, thereby degrading the quality of the coated object. Can be.

In another preferred example, the coating object is a metal-clad laminate comprising a metal layer, an adhesive layer and a base layer or a laminate comprising an inorganic deposited film layer, an adhesive layer and a base layer, the coating apparatus is It can be used for the production of the laminate.

Such a laminate is a laminate used as a back sheet of a thin film solar cell, and has a very low moisture transmittance and has a very excellent performance as a solar cell back sheet.

For example, the laminated plate is formed by applying an adhesive to one surface of a polyethylene terephthalate (PET) base film to form an adhesive layer and bonding an inorganic vapor deposition film having a thickness of 5 to 40 ㎛, and then coated both sides using a fluorine-based resin Thereafter, by drying at a temperature of approximately 100 to 200 ℃ in a vertical drying oven it can be produced in a laminated plate coated with a fluororesin.

The present invention also comprises the steps of 1) preparing a coating object; 2) performing coating on at least one surface by impregnating the coating object into the coating liquid; 3) drying the coating object coated with the entire surface while moving in a vertical upper direction or a vertical lower direction using a vertical drying oven; And 4) provides a coating method comprising the step of cooling the coating object passed through the vertical drying oven.

Since the coating method according to the present invention uses a vertical drying oven, it is possible to dry the coating liquid on the surface of the coating object uniformly and quickly through one drying process, increase the efficiency of the coating process, and reduce the process cost. There is an advantage.

In the coating method according to the present invention, as the pre-treatment and post-treatment process of the coating object, the details of the plasma treatment or corona treatment or primer treatment and drying temperature are the same as described above. Detailed description thereof will be omitted.

The present invention also provides a method for manufacturing a solar cell back sheet or a copper clad laminate using the coating method.

The solar cell backsheet or copper-clad laminate prepared by the coating method of the present invention uses a coating method using a vertical drying oven when the resin layer is formed on the substrate layer, thereby minimizing thermal deformation, and improving productivity and quality. It has excellent features.

Solar cell back sheet and a method of manufacturing the same according to the present invention can be used in the art, except for using the above-described coating method according to the present invention.

For example, the method of manufacturing a solar cell backsheet according to the present invention may include forming a fluorine-based resin layer on at least one surface of the substrate layer by using the coating method according to the present invention. And further forming a layer. The insulating layer may be formed of EVA or the like.

Hereinafter, the content of the present invention will be described with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

1 is a schematic diagram of a coating apparatus and a coating process according to an embodiment of the present invention.

Referring to FIG. 1, the coating apparatus includes an unwinder roll 1, a pretreatment unit 2, a coating booth 3, a vertical coating oven 4, a cooling unit 5, and a post-treatment unit 6. And an unwinder roll 7.

An unwinder roll 1 is an unwinder roll on which a base layer sheet of a solar cell back sheet (hereinafter referred to as a “base layer sheet”) is wound to transfer the base layer sheet to the pretreatment unit 2. The base layer sheet is primed in the pretreatment unit 2 and then transferred to the coating booth 3.

The coating booth 3 includes a resin impregnation tank 31 having a viscosity control function and a metering roll 32 for measuring the thickness of the coating layer. The base layer sheet passed through the pretreatment unit 2 is uniformly coated on both sides by the resin impregnation tank 31, and the thickness of the coating layer is measured by the metering roll 32, and then the vertical coating oven 4 Is transferred to).

The base layer sheet passing through the coating booth 3 is uniformly dried on both sides in the vertically upward vertical coating oven 4 and passes through the cooling unit 5 to complete the formation of the coating layer.

The substrate layer sheet having passed through the cooling unit 5 is plasma treated in the post-treatment unit 6 and wound up through an unwinder roll 7 to finish the fluorine-based resin coating.

2 is a schematic diagram of a coating apparatus and a coating process according to another embodiment of the present invention.

Referring to FIG. 2, the coating apparatus is an unwinder roll 1, a pretreatment unit 2, a coating booth 3, an upper vertical coating oven 41, and a lower vertical coating oven 42. It consists of a section 5, a post-processing section 6 and an unwinder roll 7.

Since the coating apparatus has a structure in which the upper vertical coating oven 41 and the lower vertical coating oven 42 are connected to the cooling unit 5, depending on the type of coating object, quality or process conditions, the coating liquid There is an advantage that can freely control the drying temperature and time.

3 is a cross-sectional view of a solar cell backsheet manufactured by the coating apparatus of FIG. 1, and FIG. 4 is a plan view of another solar cell backsheet manufactured by the coating apparatus of FIG. 1.

3 and 4, since the solar cell back sheet is dried using the vertical coating oven according to the present invention, the thickness of the fluorine-based polymer resin layer on both sides of the PET substrate layer is uniformly formed when viewed from the cross-section, the plane It can be seen from the above that the overall thickness distribution is uniform.

FIG. 5 is a cross-sectional view of another solar cell backsheet manufactured by the coating apparatus of FIG. 1.

Referring to FIG. 5, the solar cell back sheet has an adhesive layer formed on one surface of the PET base layer, and a metal foil or inorganic vapor deposition film is attached to the adhesive layer, and the other surface of the PET base layer and the metal foil or inorganic vapor deposition film attached to the adhesive layer. It consists of the structure in which the fluororesin layer was formed in the surface.

The solar cell backsheet including the metal foil or the inorganic vapor deposition film has a very excellent moisture barrier property, and by forming a fluorine resin layer on both sides, there is an advantage that can also secure weather resistance and durability.

In addition, the solar cell backsheet including the metal foil or the inorganic vapor deposition film may be manufactured with high productivity and excellent quality by coating the fluorine resin layer on both sides by a coating apparatus including a vertical coating oven of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the following Examples are only for illustrating the present invention, and the protection scope of the present invention is not limited to the following Examples.

Example 1

As a fluorine-based copolymer resin, PVDF-HFP copolymer and PMMA were dissolved in a copolymer of DMF: MEK 3: 1 at a weight ratio of 4: 1 to prepare a coating solution, and the coating solution was prepared using PET using the coating apparatus of FIG. Table 1 shows the thickness, drying temperature, coating viscosity and peel strength of the solar cell backsheet manufactured by double-coating the surface of the substrate layer.

[Table 1]

Comparative Example 1

As a fluorine-based copolymer resin, a PVDF-HFP copolymer and PMMA are dissolved in a copolymer of DMF: MEK 3: 1 at a weight ratio of 4: 1 to prepare a coating liquid, and a coating apparatus using a horizontal drying oven is used. Table 2 shows the thickness, drying temperature, coating liquid viscosity, and peel strength of the solar cell backsheet manufactured by coating on one surface of the PET base material layer, drying, and then coating the opposite side again. It was.

[Table 2]

Referring to Table 1, Figures 3 and 4, the solar cell back sheet manufactured using the coating apparatus of the present invention is a uniform thickness overall compared to the solar cell back sheet manufactured using a coating apparatus including a horizontal drying oven. It can be seen that the deviation and good adhesion. In particular, the plan view of the solar cell backsheet of Figure 4 prepared using the coating apparatus of the present invention can be seen that the overall thickness distribution is uniform as 125 to 127㎛ overall.

In addition, referring to Table 1 and Table 2, even when coating both sides using vertical drying oven which is economical and easy to process, it can show the same physical properties as when coating twice using existing horizontal drying oven. Able to know.

1 is a schematic diagram of a coating apparatus and a coating process according to an embodiment of the present invention;

2 is a schematic diagram of a coating apparatus and a coating process according to another embodiment of the present invention;

3 is a cross-sectional view of a solar cell backsheet manufactured by the coating apparatus of FIG. 1;

4 is a plan view of another solar cell backsheet manufactured by the coating apparatus of FIG. 1;

5 is a cross-sectional view of another solar cell back sheet manufactured by the coating apparatus of FIG.

Claims (15)

A coating apparatus for applying a coating liquid to the surface of the coating object, 1) a coating booth for impregnating the coating object with a coating liquid to perform coating on at least one surface of the coating object; 2) a vertical drying oven for drying the coating liquid on the surface of the coating object while moving the coating object passing through the coating booth in the vertical upper direction or the vertical lower direction; And 3) a coating object transporting part for supporting or fixing the coating object to continuously pass the coating booth and the vertical drying oven; Including, The vertical drying oven further includes a cooling unit for cooling the coating object, and the coating booth, the vertical drying oven and the cooling unit are sequentially disposed, The coating apparatus further includes a pretreatment unit and a post-treatment unit, the pretreatment unit, the coating booth, vertical drying oven and the post-treatment unit are sequentially disposed, And the pretreatment unit and the post-treatment unit perform plasma treatment, corona treatment, or primer treatment on both surfaces of the coating object or both surfaces of the coated object. The method of claim 1, wherein the coating object transfer unit is a roller device including an unwinder roll (winder roll), a winder roll (guideer roll) and a guide roll (guide roll), unwinder roll, coating booth, vertical drying oven and wine The rolls are arranged sequentially, one or more guide rolls in the group consisting of the position between the unwinder roll and the coating booth, the interior of the coating booth, the position between the coating booth and the vertical drying oven and the position between the vertical drying oven and the winder roll Coating device, characterized in that arranged in one or more positions selected. The coating apparatus according to claim 1, wherein the coating booth comprises a resin bath having a viscosity control function of the coating liquid and a metering roll measuring the thickness of the coating layer. delete The coating apparatus according to claim 1, wherein the vertical drying oven is formed in at least two drying sections which are continuous in a vertical direction and have different drying temperatures. The coating apparatus according to claim 1, wherein at least two vertical drying ovens are disposed in parallel with each other. delete delete The coating apparatus according to claim 1, wherein the coating object is a base layer film of a solar cell back sheet, and the coating liquid is a resin composition containing a fluorine resin. The coating apparatus according to claim 1, wherein the coating object is a metal-clad laminate including a metal layer, an adhesive layer, and a base layer, or a laminated film including an inorganic deposition film layer, an adhesive layer, and a base layer. . 1) preparing a coating object; 2) performing coating on both sides by impregnating the coating object into the coating liquid; 3) drying the coating object coated with the entire surface while moving in a vertical upper direction or a vertical lower direction using a vertical drying oven; And 4) cooling the coating object passed through the vertical drying oven; Including, Plasma treatment, corona treatment or primer treatment is further included on the surface of the object to be coated before performing the coating of step 2). After the cooling of the step 4), the coating surface of the coating object further comprising the step of plasma (Plasma) treatment, corona treatment (corona) or primer (primer) treatment. delete delete The method of manufacturing a solar cell backsheet according to claim 11. The manufacturing method of the copper clad laminated board containing the coating method of Claim 11.

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