Photovoltaic adhesive film embossing roller

Abstract

The utility model discloses a photovoltaic adhesive film knurling roller which comprises a roller body, knurling grooves are formed in the outer circle face of the roller body, and openings of the knurling grooves are hexagonal. According to the photovoltaic adhesive film embossing roller, the roughness of an adhesive film can be improved, and the anti-skid effect of the photovoltaic adhesive film is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic film production equipment, and specifically relates to a photovoltaic film embossing roller. Background Art

[0002] Photovoltaic film is a commonly used encapsulation film in solar cell modules. It can not only play the role of encapsulation and bonding in the module, but also has various functions such as insulation, light transmission, light blocking, and protection. In one process, the film is laid flat on the photovoltaic glass.

[0003] In the photovoltaic film production process, the film is cast into a flat film through a T-die, and then the embossing roller and the rubber roller are pressed together to form a pattern on the surface of the flat film.

[0004] Currently, there are two main types of patterns on embossing rollers used in the production of photovoltaic films, namely orange peel patterns (also known as irregular patterns) and “#” patterns.

[0005] As N-type modules gain more market share, the weight and thickness of photovoltaic films decrease, reducing friction between the film and the glass. Furthermore, increasing production line speeds at photovoltaic module factories increase the inertia between the film and the glass. Consequently, the anti-slip effect of films produced with existing embossing rollers is relatively short-lived, leading to an increasing prevalence of film slipping on glass. Films produced with existing embossing rollers no longer meet module requirements, impacting product yield and production efficiency.

[0006] Chinese patent application number 202210481240.2 discloses a photovoltaic glass and a matching calendering roller, belonging to the field of photovoltaic glass production and processing. The photovoltaic glass body is a photovoltaic glass substrate, which is divided into an upper surface and a lower surface. The upper surface is the sunlight entrance surface, and the upper surface is concavely provided with multiple upper pattern structures. The upper pattern structures are evenly arranged, and the multiple upper pattern structures are arranged in a matrix pattern, and each upper pattern structure is a multi-faceted trapezoid. The present invention has the advantages of reasonable structural design, high light transmittance, basically no color difference after AR coating, and controllable diffuse reflection.

[0007] It is hoped to provide an improved photovoltaic film embossing roller, particularly with regard to improving the anti-slip effect of the photovoltaic film. Utility Model Content

[0008] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a photovoltaic film embossing roller, the purpose of which is to improve the anti-slip effect of the photovoltaic film.

[0009] In order to achieve the above purpose, the technical solution adopted by the present invention is: a photovoltaic film embossing roller includes a roller body, an outer circumferential surface of the roller body is provided with an embossing groove, and the opening of the embossing groove is hexagonal.

[0010] The cross-sectional area of ​​the embossing groove gradually decreases from the opening toward the interior of the roller body.

[0011] The embossing grooves extend along the radial direction of the roller body.

[0012] The length of the opening of the embossed groove is 0.86 mm, and the width of the opening of the embossed groove is 0.50 mm.

[0013] The embossing grooves are arranged in plurality, and the transverse spacing between two adjacent embossing grooves is 0.98 mm.

[0014] The longitudinal distance between two adjacent embossing grooves is 1.06 mm.

[0015] The photovoltaic film embossing roller of the utility model can increase the roughness of the film and improve the anti-slip effect of the photovoltaic film. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This manual includes the following drawings, which show the following contents:

[0017] Figure 1 This is a partial cross-sectional view of the photovoltaic film embossing roller of the utility model;

[0018] Figure 2 It is a structural diagram of the embossing groove;

[0019] Figure 3 It is a schematic diagram of the embossing roller texture;

[0020] Figure 4 It is a schematic diagram of the texture on the film surface;

[0021] Figure 5 It is a 3D scanned glass pattern;

[0022] Markings in the figure are: 1, roller body; 2, embossing groove; 3, first side; 4, second side; 5, third side; 6, fourth side; 7, fifth side; 8, sixth side. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation methods of the present invention by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and to facilitate its implementation.

[0024] It should be noted that, in the following embodiments, the "first", "second", "third", "fourth", "fifth" and "sixth" do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0025] like Figures 1 to 3 As shown, the utility model provides a photovoltaic film embossing roller, including a cylindrical roller body 1, a plurality of embossing grooves 2 are arranged on the outer circumferential surface of the roller body 1, and the openings formed by the embossing grooves 2 on the outer circumferential surface of the roller body 1 are in the shape of a hexagon. An embossing roller of this shape can form convex points on the pressed photovoltaic film, and the convex points can fit firmly with the concave points on the embossing pattern on the glass, thereby increasing the friction and tension between the photovoltaic film and the glass, and achieving an anti-slip effect.

[0026] Specifically, if Figure 1 and Figure 2 As shown, the cross-section of the embossing groove 2 is hexagonal, and the cross-sectional area of ​​the embossing groove 2 gradually decreases from the opening toward the inside of the roller body 1. The embossing groove 2 extends along the radial direction of the roller body 1. The cross-section of the embossing groove 2 is a cross-section perpendicular to the radial direction of the roller body 1, and the minimum cross-sectional area of ​​the embossing groove 2 is zero.

[0027] A plurality of embossed grooves 2 are provided on the outer circumferential surface of the roller body 1. All the embossed grooves 2 are densely distributed on the outer circumferential surface of the roller body 1. Preferably, the horizontal spacing (the horizontal direction is parallel to the axis of the roller body 1) between two adjacent embossed grooves 2 is 0.98 mm, and the longitudinal spacing (the longitudinal direction is perpendicular to the axis of the roller body 1) between two adjacent embossed grooves 2 is 1.06 mm. The length of the opening of the embossed groove 2 is 0.86 mm, the width of the opening of the embossed groove 2 is 0.50 mm, the length direction of the opening of the embossed groove 2 is perpendicular to the width direction, and the length direction of the opening of the embossed groove 2 is parallel to the above-mentioned longitudinal direction, the width direction of the opening of the embossed groove 2 is parallel to the above-mentioned transverse direction, the roughness at the embossed groove 2 is ≧35 μm, and the embossed grooves 2 are evenly distributed on the entire surface of the roller body 1.

[0028] Preferably, the depth of the embossed groove 2 is 0.20 to 0.23 mm, which can make the produced film thinner and allow more meters to be rolled up at the same packaging size, thereby reducing the cost of packaging materials and achieving cost reduction and profit.

[0029] like Figure 1 and Figure 2As shown, the opening formed by the embossing groove 2 on the outer circular surface of the roller body 1 is surrounded by the first side 3, the second side 4, the third side 5, the fourth side 6, the fifth side 7 and the sixth side 8, the two ends of the first side 3 are respectively connected to one end of the second side 4 and one end of the sixth side 8, the two ends of the second side 4 are respectively connected to one end of the first side 3 and one end of the third side 5, the two ends of the third side 5 are respectively connected to the other end of the second side 4 and one end of the fourth side 6, the two ends of the fourth side 6 are respectively connected to the other end of the third side 5 and one end of the fifth side 7, the two ends of the fifth side 7 are respectively connected to the other end of the fourth side 6 and the other end of the sixth side 8, and the two ends of the sixth side 8 are respectively connected to the other end of the fifth side 7 and the other end of the first side 3. The first side 3 and the fourth side 6 are parallel and have the same length, the second side 4 and the fifth side 7 are parallel and have the same length, the third side 5 and the sixth side 8 are parallel and have the same length, the first side 3 and the sixth side 8 are the same length, and the third side 5 and the fourth side 6 are the same length. The length of the opening of the embossed groove 2 refers to the maximum distance between the end of the first side 3 and the end of the third side 5, and the width of the opening of the embossed groove 2 refers to the distance between the second side 4 and the fifth side 7.

[0030] The embossing roller with this pattern creates a film surface that is not simply dotted. Instead, the dots become increasingly pointed as they ascend, further increasing friction with the glass and effectively preventing slippage. This reduces manual smoothing on the module side, improving production efficiency. Furthermore, eliminating the risk of missed inspections during manual smoothing can further reduce the defective rate of modules, significantly contributing to improved yield rates for module manufacturers.

[0031] The film produced by the embossing roller with the above-mentioned pattern was subjected to roughness and glass tensile tests. The roughness was ≥35um, which is a qualitative improvement compared to the roughness of orange peel pattern of more than ten and the roughness of # pattern of more than twenty. The tensile strength can be increased by 4N and 2N respectively compared to orange peel pattern and # pattern.

[0032] The above description of the present invention is provided as an example, in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any application of the above-described concepts and technical solutions of the present invention to other situations without modification, are all within the scope of protection of the present invention.

Claims

1. Photovoltaic film embossing roller, including a roller body, characterized by: An embossed groove is arranged on the outer circumferential surface of the roller body, and the opening of the embossed groove is hexagonal.

2. The photovoltaic film embossing roller according to claim 1, characterized in that: The cross-sectional area of ​​the embossing groove gradually decreases from the opening toward the interior of the roller body.

3. The photovoltaic film embossing roller according to claim 1, characterized in that: The embossing grooves extend along the radial direction of the roller body.

4. The photovoltaic film embossing roller according to any one of claims 1 to 3, characterized in that: The length of the opening of the embossed groove is 0.86 mm, and the width of the opening of the embossed groove is 0.50 mm.

5. The photovoltaic film embossing roller according to claim 4, characterized in that: The embossing grooves are arranged in plurality, and the transverse spacing between two adjacent embossing grooves is 0.98 mm.

6. The photovoltaic film embossing roller according to claim 5, characterized in that: The longitudinal distance between two adjacent embossing grooves is 1.06 mm.

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