Double-sided coating type transparent back plate and coating device thereof

Abstract

The invention belongs to the technical field of solar cell backboards, and particularly relates to a double-sided coating type transparent backboard and a coating device thereof. The transparent backboard comprises a base material layer which is a transparent PET backboard film; the inner coating layer is formed on one side of the base material layer and comprises the following components: fluorine-containing resin, acrylic resin, a curing agent, matting powder, inorganic particles and an organic solvent; the outer coating layer is formed on the other side of the base material layer and comprises the following components: fluorine-containing resin, a curing agent, inorganic particles and an organic solvent; wherein the outer coating layer and the inner coating layer are formed on the two surfaces of the base material layer at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of solar cell back panels, and in particular relates to a double-sided coated transparent back panel and a coating device thereof. Background Art

[0002] The solar cell backplane is located at the outermost layer on the back of the module. It protects the solar cell module from water vapor erosion in outdoor environments, blocks oxygen to prevent oxidation, is resistant to high and low temperatures, reflects sunlight, and improves the conversion efficiency of the module. It also has a high infrared emissivity, which can reduce the temperature of the module. From a process point of view, solar cell backplanes are divided into two types: single-sided coating and double-sided coating. The backplane uses transparent PET as the base material, and the transparent backplane is obtained after double-sided coating. Since the outer layer of the double-sided coated transparent backplane does not need to be pasted with a fluorine film, the laminating process is reduced, so the cost of the double-sided coated backplane is lower than that of the backplane with one side coated and the other side pasted with a fluorine film.

[0003] However, the existing double-sided coated backplane has poor water and oxygen barrier performance, and the coating layers coated on both sides of the transparent backplane need to be coated and dried twice, which affects the production efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a double-sided coated transparent backplane with a simple structure and good water and oxygen barrier performance, and a coating device that is convenient for forming a coating layer in order to solve the above-mentioned technical problems.

[0005] In view of this, the present invention provides a double-sided coated transparent back sheet, comprising: The substrate layer is a transparent PET back sheet film; The inner coating layer is formed on one side of the substrate layer and includes the following components: fluorine-containing resin, acrylic resin, curing agent, matting powder, inorganic particles, and organic solvent; The outer coating layer is formed on the other side of the substrate layer and includes the following components: a fluorine-containing resin, a curing agent, inorganic particles, and an organic solvent; The outer coating layer and the inner coating layer are formed simultaneously on the two sides of the substrate layer.

[0006] In the above technical solution, further, the curing agent in the outer coating layer component is HDI trimer curing agent, the inorganic particles are silicon dioxide, and the organic solvent is one of butanone, toluene, butyl acetate, propylene glycol monomethyl ether acetate, acetylacetone, butyl butyrate or butyl acetate; The curing agent in the inner coating layer component is HDI trimer curing agent, the matting powder is silicon dioxide powder, and the organic solvent is one of butanone, toluene, butyl acetate, propylene glycol monomethyl ether acetate, acetylacetone, butyl butyrate or butyl acetate.

[0007] A coating device suitable for a double-sided coated transparent backplane, comprising: frame; An unwinding assembly is arranged at one end of the frame; A winding assembly is arranged at the other end of the frame; The coating assembly is arranged on the frame and is located between the unwinding assembly and the rewinding assembly and is located at one end close to the unwinding assembly; A drying component is arranged on the frame and is located between the coating component and the winding component; The coating components include: Two coating racks are symmetrically arranged and vertically mounted on the frame; The two coating components are respectively arranged on the two coating racks and are arranged opposite to each other.

[0008] In the above technical solution, further, the coating component includes: A coating driver is arranged on the coating frame; A coating support frame is arranged on the driving end of the coating driver and is driven by the coating driver; Two coating support mechanisms are symmetrically arranged on the coating support frame; A coating support plate, with two ends respectively connected to two coating support mechanisms; Two coating rollers are freely rotatably arranged on the coating support plate; The coating rollers in the two coating components are against each other.

[0009] In the above technical solution, further, the coating support mechanism includes: The supporting shell is a cylindrical structure with an opening at one end and a closed end at the other end, and a supporting plate is formed at the closed end; A support rod is coaxially arranged in the support shell and extends out of the support shell, and a plurality of evenly distributed positioning blocks are formed on the outer wall of one end facing the support shell, and a fixing hole is formed on the end away from the support shell; The outer cover is fixedly arranged on one end of the opening of the supporting shell and is formed with an extension hole for the supporting rod to extend out; The inner support member is arranged inside the support shell and cooperates with the support rod.

[0010] In the above technical solution, further, the inner support member includes: A lower support sleeve is sleeved on one end of the support rod with the positioning block and is located on one side of the positioning block; The lower positioning plug is sleeved on one end of the support rod with the positioning block and is located on the other side of the positioning block; An upper support member is arranged in the support shell and sleeved on the support rod, and one end of the upper support member abuts against the outer cover and the other end abuts against the lower support sleeve; The lower support assembly is arranged at the closed end of the support shell and cooperates with the lower positioning plug.

[0011] The beneficial effects of the present invention are: 1. The back sheet has good water and oxygen barrier properties by adding fluorine-containing resin to the inner coating layer and the outer coating layer; 2. The outer coating layer and the inner coating layer in the back sheet are formed simultaneously on both sides of the substrate layer, thereby improving the production efficiency of the back sheet; 3. The coating device achieves the effect and efficiency of simultaneous double-sided coating of the back panel through the setting of the coating components. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the transparent back plate in the present invention; Figure 2 It is a schematic structural diagram of the coating device in the present invention; Figure 3 It is a schematic structural diagram of the transparent back plate in the running track of the coating device in the present invention; Figure 4 It is a schematic diagram of the structure of the coating component in the present invention; Figure 5 It is a structural schematic diagram of the coating support mechanism in the present invention; Markings in the figure are: 100-substrate layer, 101-inner coating layer, 102-outer coating layer, 1-frame, 2-unwinding assembly, 3-winding assembly, 4-drying assembly, 5-coating frame, 6-coating support frame, 7-coating support plate, 8-coating roller, 9-support shell, 10-support rod, 10a-positioning block, 11-outer cover, 12-lower support sleeve, 12a-outer sleeve, 12b-inner positioning hole, 13-lower positioning plug, 13a-lower plug body, 13b-support edge, 13c-lower plug hole, 14-upper support member, 15-lower support block, 15a-floating hole, 16-lower guide rod, 16a-limiting edge, 16b-support hole, 17-outer support member. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0014] Embodiment 1: This embodiment provides a double-sided coated transparent backplane. The substrate layer 100 is a transparent PET back sheet film; The inner coating layer 101 is formed on one side of the substrate layer 100 and includes the following components: fluorine-containing resin, acrylic resin, curing agent, matting powder, inorganic particles, and organic solvent; The outer coating layer 102 is formed on the other side of the substrate layer 100 and includes the following components: fluorine-containing resin, curing agent, inorganic particles, and organic solvent; The outer coating layer 102 and the inner coating layer 101 are formed on two surfaces of the substrate layer 100 at the same time.

[0015] In this embodiment, fluorine-containing resin is added to the inner coating layer 101 and the outer coating layer 102 so that the backplane has good water and oxygen barrier properties; the outer coating layer 102 and the inner coating layer 101 are simultaneously formed on both sides of the substrate layer 100, thereby improving the production efficiency of the backplane.

[0016] Embodiment 2: This embodiment provides a double-sided coated transparent backplane, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0017] The curing agent in the components of the outer coating layer 102 is HDI trimer curing agent, the inorganic particles are silicon dioxide, and the organic solvent is one of butanone, toluene, butyl acetate, propylene glycol monomethyl ether acetate, acetylacetone, butyl butyrate or butyl acetate; The curing agent in the components of the inner coating layer 101 is HDI trimer curing agent, the matting powder is silicon dioxide powder, and the organic solvent is one of butanone, toluene, butyl acetate, propylene glycol monomethyl ether acetate, acetylacetone, butyl butyrate or butyl acetate.

[0018] In this embodiment, the outer coating layer 102 and the inner coating layer 101 use the above-mentioned components to make the backplane film have good water and oxygen barrier properties, high and low temperature resistance, good insulation and aging resistance, and corrosion resistance; the outer coating surface is the contact surface with the environment and has good resistance to environmental erosion.

[0019] Embodiment 3: This embodiment provides a coating device suitable for a double-sided coated transparent backplane, comprising: Rack 1; An unwinding assembly 2 is arranged at one end of the frame 1; The winding assembly 3 is arranged at the other end of the frame 1; The coating assembly is arranged on the frame 1 and is located between the unwinding assembly 2 and the rewinding assembly 3 and is located at one end close to the unwinding assembly 2; A drying assembly 4 is arranged on the frame 1 and between the coating assembly and the winding assembly 3; The coating components include: Two coating racks 5 are symmetrically arranged and vertically mounted on the frame 1; The two coating components are respectively arranged on the two coating racks 5 and are arranged opposite to each other.

[0020] In this embodiment, the unwinding assembly 2 includes an unwinding roller for placing the transparent backplane film roll to be coated, and the unwinding roller is driven to rotate by an external unwinding motor; the winding assembly 3 includes a winding roller for winding the transparent backplane film roll after coating, and the winding roller is driven to rotate by an external winding motor, wherein the winding roller and the unwinding roller are synchronously operated; the coating assembly performs double-sided synchronous coating on the transparent backplane; and the drying assembly 4 dries the transparent backplane coated by the coating assembly, thereby preventing the inner coating layer 101 and the outer coating layer 102 from peeling off. In order to facilitate the transparent backplane to enter the coating assembly, a receiving roller can be set on the frame 1 at the lower side of the coating assembly and located in the middle of the two coating racks 5. The coating assembly can facilitate the installation and fixation of the coating components. The transparent backplane to be coated passes between the two coating components, and the two coating components coat the two sides of the transparent backplane respectively.

[0021] Embodiment 4: This embodiment provides a coating device suitable for a double-sided coated transparent backplane, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0022] Coated parts include: A coating driver is arranged on the coating frame 5; The coating support frame 6 is arranged on the driving end of the coating driver and driven by the coating driver; Two coating support mechanisms are symmetrically arranged on the coating support frame 6; The coating support plate 7 has two ends connected to the two coating support mechanisms respectively; Two coating rollers 8 are freely rotatably arranged on the coating support plate 7; The coating rollers 8 in the two coating components are against each other.

[0023] In this embodiment, the coating driver is used to drive the coating roller 8 on the coating support frame 6 to move toward the transparent back plate, and the coating rollers 8 in the two coating components are respectively pressed against the two sides of the transparent back plate for coating; thereby achieving the effect of synchronous coating. The coating support frame 6 is provided with a coating support mechanism, which is used to support the coating support plate 7 and the coating roller 8 arranged on the coating support plate 7; the coating roller 8 coats the transparent back plate; wherein the two coating rollers 8 in the same coating component are displaced up and down, that is, the coating roller 8 on the upper side is located obliquely above the coating roller 8 on the lower side of the displacement; the two coating rollers 8 on the upper side of the two coating components are respectively against each other and are displaced up and down, so that the distribution of the two groups of coating rollers can ensure the uniform coating of the coating layer on both sides of the transparent back plate. The coating driver can be a servo telescopic rod.

[0024] Embodiment 5: This embodiment provides a coating device suitable for a double-sided coated transparent backplane, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0025] The coating support mechanism includes: The support shell 9 is a cylindrical structure with an opening at one end and a closed end, and a support plate is formed at the closed end; A support rod 10 is coaxially disposed in the support shell 9 and extends out of the support shell 9, and a plurality of evenly distributed positioning blocks 10a are formed on the outer wall of one end facing the support shell 9, and a fixing hole is formed on the end away from the support shell 9; The outer cover 11 is fixedly arranged on one end of the opening of the support shell 9 and is formed with an extension hole for the support rod 10 to extend out; The inner support member is arranged inside the support shell 9 and cooperates with the support rod 10 .

[0026] In this embodiment, the support shell 9 is fixedly connected to the coating rack 5 through the support plate, and one end of the support rod 10 with a fixing hole is fixedly connected to the coating support plate 7; the outer cover 11 can be threadedly connected to the support shell 9, and the outer cover 11 can prevent the support rod 10 from being separated from the support shell 9 through the cooperation of the positioning block 10a on the support rod 10; and the inner support can ensure that the support rod 10 is well arranged in the support shell 9, so as to ensure that the coating roller 8 on the coating support plate 7 arranged at the end of the support rod 10 is better fitted with the transparent back plate to be coated, thereby ensuring the coating effect. The extension hole on the outer cover 11 is in clearance fit with the support rod 10.

[0027] Embodiment 6: This embodiment provides a coating device suitable for a double-sided coated transparent backplane, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0028] The inner support includes: The lower support sleeve 12 is sleeved on one end of the support rod 10 with the positioning block 10a and is located on one side of the positioning block 10a; The lower positioning plug 13 is sleeved on one end of the support rod 10 with the positioning block 10a and is located on the other side of the positioning block 10a; The upper support member 14 is disposed in the support housing 9 and sleeved on the support rod 10, and one end of the upper support member 14 abuts against the outer cover 11 and the other end of the upper support member 14 abuts against the lower support sleeve 12; The lower support assembly is arranged at a closed end of the support shell 9 and cooperates with the lower positioning plug 13.

[0029] In this embodiment, the cooperation between the upper support sleeve and the lower positioning plug 13 can provide good support and positioning effects for the positioning block 10a and the support rod 10, thereby ensuring the overall stability of the support rod 10, and the upper support member 14 can be an elastic mechanical part such as a spring or a disc spring. The upper support member 14 and the lower support assembly are arranged so that the end of the support rod 10 can be well elastically supported in the support shell 9, that is, when the two coating components drive and the coating rollers 8 on both sides are pressed against each other, so that the support rod 10 forms a tendency to move toward the bottom of the support shell 9, the arrangement of the lower support assembly can ensure that the coating rollers 8 on both sides are in elastic contact, thereby ensuring the fit between the coating rollers 8 and the transparent back plate to be coated; and when the two coating components separate the coating rollers 8 on both sides, the upper support member 14 can ensure the stable reset of the support rod 10. When the coating rollers 8 on both sides are not in contact, the lower support is in a certain compression state under the support of the lower support assembly.

[0030] Embodiment 7: This embodiment provides a coating device suitable for a double-sided coated transparent backplane, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0031] The lower support sleeve 12 comprises: The outer sleeve 12a is sleeved on the support rod 10; The inner positioning hole 12b is coaxially formed in the outer sleeve 12a, and includes a limiting portion, a placement portion and a through hole portion which are connected in sequence and have decreasing diameters from one closed end of the support shell 9 to the other end; The support rod 10 passes through the through hole, and the positioning block 10a is located in the placement portion and can abut against the end surface of the placement portion.

[0032] In this embodiment, one end of the outer sleeve 12a is used to contact the upper support member 14, and the upper support member 14 is abutted against the outer sleeve 12a, and then the positioning block 10a on the support rod 10 is limited by the outer sleeve 12a, thereby ensuring that the upper support member 14 can provide good elastic support for the upper part of the support rod 10; and the setting of the inner positioning hole 12b can not only facilitate the passage of the support rod 10, but also better limit the positioning block 10a.

[0033] Embodiment 8: This embodiment provides a coating device suitable for a double-sided coated transparent backplane, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0034] The lower positioning plug 13 comprises: The lower plug body 13a is arranged on the limiting portion and partially extends out of the limiting portion; The support edge 13b is integrally formed on the closed end of the lower plug body 13a close to the support shell 9; A lower plug hole 13c extending from the support edge 13b to the lower plug body 13a; The outer anti-deflection block is integrally formed on the outer wall of the lower plug body 13a, and a limiting groove cooperating therewith is formed on the limiting portion; The support rod 10 passes through the lower plug hole 13c, and the positioning block 10a abuts against the end surface of the lower plug body 13a.

[0035] In this embodiment, the lower support assembly is abutted against the support edge 13b, and the lower plug body 13a is supported by the lower support assembly, and then the positioning block 10a is limited by the lower plug hole 13c, thereby ensuring that the lower support assembly can provide good elastic support to the support rod 10 on the lower side; and the setting of the external anti-deflection block can improve the stability of the contact between the lower support sleeve 12 and the lower positioning plug 13.

[0036] Embodiment 9: This embodiment provides a coating device suitable for a double-sided coated transparent backplane, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0037] The lower support assembly includes: A lower support block 15, disposed in the support housing 9 and in contact with the closed end of the support housing 9; A lower guide rod 16, one end of which is limitedly engaged with the lower support block 15, and the other end of which extends toward the lower positioning plug 13; The outer support member 17 is sleeved outside the lower guide rod 16 and has one end abutting against the lower positioning plug 13 and the other end abutting against the lower support block 15 .

[0038] In this embodiment, the lower support block 15 is used to limit and support the lower guide rod 16, and the outer support member 17 can be an elastic part such as a spring or a disc spring. The setting of the outer support member 17 can provide good elastic support for the lower positioning plug 13, that is, it can provide elastic support to the lower end of the support rod 10.

[0039] Embodiment 10: This embodiment provides a coating device suitable for a double-sided coated transparent backplane, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0040] The lower support block 15 is provided with a floating hole 15a, and the floating hole 15a is located at an end away from the support shell 9 and is formed with a closing portion, and the lower guide rod 16 is inserted into the floating hole 15a and is formed with a limiting edge 16a that cooperates with the closing portion; The closing portion is in a two-section arc-shaped structure, and an arc-shaped surface that is in sliding contact with the closing portion is formed on the limiting edge 16a; A support hole 16 b is formed at one end of the lower guide rod 16 facing the lower positioning plug 13 , into which the support rod 10 extends and slides.

[0041] In this embodiment, the floating hole 15a formed on the lower support block 15 allows the lower guide rod 16 to swing relative to the lower support block 15, that is, the support rod 10, one end of which is slidably matched with the lower guide rod 16, can also swing relative to the support shell 9, so that the position of the coating roller 8 can be better adjusted when the coating rollers 8 on both sides are pressed tightly, thereby ensuring smooth passage of the coated transparent back plate. The limit edge 16a is formed with an arc surface that is in sliding contact with the closing part, so as to reduce the friction between the limit edge 16a and the closing part, thereby ensuring the service life of the entire coating support mechanism.

[0042] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A double-sided coated transparent back sheet, characterized in that: The substrate layer (100) is a transparent PET backplane film; The inner coating layer (101) is formed on one side of the substrate layer (100) and comprises the following components: fluorine-containing resin, acrylic resin, curing agent, matting powder, inorganic particles, and organic solvent; The outer coating layer (102) is formed on the other side of the substrate layer (100) and comprises the following components: a fluorine-containing resin, a curing agent, inorganic particles, and an organic solvent; The outer coating layer (102) and the inner coating layer (101) are simultaneously formed on two surfaces of the substrate layer (100).

2. A double-sided coated transparent back sheet according to claim 1, characterized in that: The curing agent in the components of the outer coating layer (102) is an HDI trimer curing agent, the inorganic particles are silicon dioxide, and the organic solvent is one of butanone, toluene, butyl acetate, propylene glycol monomethyl ether acetate, acetylacetone, butyl butyrate or butyl acetate; The curing agent in the inner coating layer (101) is an HDI trimer curing agent, the matting powder is silicon dioxide powder, and the organic solvent is one of butanone, toluene, butyl acetate, propylene glycol monomethyl ether acetate, acetylacetone, butyl butyrate or butyl acetate.

3. A coating device suitable for producing the double-sided coated transparent back sheet according to any one of claims 1 to 2, characterized in that: include: Rack(1); An unwinding assembly (2) is arranged at one end of the frame (1); A winding assembly (3) is arranged at the other end of the frame (1); A coating assembly is arranged on the frame (1) and is located between the unwinding assembly (2) and the rewinding assembly (3) and is located at one end close to the unwinding assembly (2); A drying component (4) is arranged on the frame (1) and is located between the coating component and the winding component (3); The coating assembly includes: Two coating racks (5) are symmetrically arranged and vertically mounted on the frame (1); The two coating components are respectively arranged on the two coating racks (5) and are arranged opposite to each other.

4. The coating device for a double-sided coated transparent back sheet according to claim 3, characterized in that: The coating component comprises: A coating driver, arranged on the coating frame (5); A coating support frame (6) is arranged on a driving end of the coating drive and is driven by the coating drive; Two coating support mechanisms are symmetrically arranged on the coating support frame (6); A coating support plate (7), both ends of which are respectively connected to two coating support mechanisms; Two coating rollers (8) are freely rotatably arranged on the coating support plate (7); The coating rollers (8) in the two coating components are against each other.

5. The coating device for a double-sided coated transparent back sheet according to claim 4, characterized in that: The coating support mechanism comprises: The support shell (9) is a cylindrical structure with an opening at one end and a closed end at the other end, and a support plate is formed at the closed end; A support rod (10) is coaxially arranged in the support shell (9) and extends out of the support shell (9), and an outer wall of one end facing the support shell (9) is formed with a plurality of evenly distributed positioning blocks (10a), and an end away from the support shell (9) is formed with a fixing hole; An outer cover (11) is fixedly mounted on one end of the opening of the support shell (9) and is formed with an extension hole for the support rod (10) to extend out; An inner support member is arranged inside the support shell (9) and cooperates with the support rod (10).

6. The coating device for a double-sided coated transparent back sheet according to claim 5, characterized in that: The inner support member comprises: A lower support sleeve (12) is sleeved on one end of the support rod (10) with the positioning block (10a) and is located on one side of the positioning block (10a); A lower positioning plug (13) is sleeved on one end of the support rod (10) with the positioning block (10a) and is located on the other side of the positioning block (10a); An upper support member (14) is disposed in the support housing (9) and sleeved on the support rod (10), with one end abutting against the outer cover (11) and the other end abutting against the lower support sleeve (12); The lower support assembly is arranged at the closed end of the support shell (9) and cooperates with the lower positioning plug (13).

7. The coating device for a double-sided coated transparent back sheet according to claim 6, characterized in that: The lower support sleeve (12) comprises: An outer sleeve (12a) sleeved on the support rod (10); An inner positioning hole (12b) is coaxially formed in the outer sleeve (12a), and comprises a limiting portion, a placement portion and a through hole portion which are sequentially connected and have decreasing diameters from one closed end of the supporting outer shell (9) to the other end; The support rod (10) passes through the through hole portion, and the positioning block (10a) is located in the placement portion and can abut against the end surface of the placement portion.

8. The coating device for a double-sided coated transparent back sheet according to claim 7, characterized in that: The lower positioning plug (13) comprises: A lower plug body (13a) is arranged on the limiting portion and partially extends out of the limiting portion; A support edge (13b) is integrally formed on a closed end of the lower plug body (13a) adjacent to the support shell (9); A lower plug hole (13c) extending from the support edge (13b) to the lower plug body (13a); An external anti-deflection block (13d) is integrally formed on the outer wall of the lower plug body (13a), and a limiting groove cooperating with the limiting block is formed on the limiting portion; The support rod (10) passes through the lower plug hole (13c), and the positioning block (10a) abuts against the end surface of the lower plug body (13a).

9. The coating device for a double-sided coated transparent back sheet according to claim 6, characterized in that: The lower support assembly comprises: A lower support block (15) is disposed in the support shell (9) and is in contact with the closed end of the support shell (9); A lower guide rod (16), one end of which is limitedly engaged with the lower support block (15) and the other end of which extends toward the lower positioning plug (13); The outer support member (17) is sleeved outside the lower guide rod (16) and has one end abutting against the lower positioning plug (13) and the other end abutting against the lower support block (15).

10. The coating device for a double-sided coated transparent back sheet according to claim 9, characterized in that: The lower support block (15) is provided with a floating hole (15a), and the floating hole (15a) is located at an end away from the support shell (9) and is closed to form a closing portion, and the lower guide rod (16) is inserted into the floating hole (15a) and is formed with a limiting edge (16a) that cooperates with the closing portion to limit the position; The closing portion is in the form of two arc-shaped structures, and an arc-shaped surface that is in sliding contact with the closing portion is formed on the limiting edge (16a); A support hole (16b) is formed at one end of the lower guide rod (16) facing the lower positioning plug (13) for the support rod (10) to extend into and slide into.

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