Long-service-life thin-wire-diameter printing screen
By designing a coating system on the photovoltaic printing screen, the problem of reduced mesh strength after fine wire diameter etching is solved, the bonding strength and laser damage protection are enhanced, and the service life of the screen is extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-10
- Publication Date
- 2026-03-24
AI Technical Summary
Existing photovoltaic printing screens suffer from reduced strength after fine wire diameter etching, making them prone to microcracks and hydrogen embrittlement, which shortens their lifespan. Furthermore, the damage is exacerbated during laser cutting, affecting printing quality and screen lifespan.
A special coating system is designed on the surface of the mesh using coating technology, including transition coating and functional coating, to enhance the adhesion strength between the mesh and the polyimide film, and to improve the laser damage threshold, protecting the mesh from damage by high energy density lasers.
It effectively reduces mesh damage, improves the service life and bonding strength of the screen, avoids delamination and deformation, and extends the service life of the screen.
Smart Images
Figure CN224028613U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to printing screen technology field more specifically, it relates to a long life fine line diameter printing screen. BACKGROUND
[0002] At present, in the production process of photovoltaic cell, screen printing technology is mature, and can meet the demand of cell grid line precision, is widely used in the printing of solar cell front and back grid line, and the mold for printing is printing screen. The main body of photovoltaic printing screen is screen frame and composite screen, and the composite screen is generally composed of the first material screen fixed on the screen frame and the second material screen combined with the first material screen. The first material screen is usually polyester fiber screen cloth, and the second material screen can be a certain mesh number of woven metal screen, electroformed metal screen, etc. The second material screen has a functional film layer and a pattern area, and the commonly used functional film layer includes electroformed metal film, polyimide film, photosensitive emulsion, etc. The pattern area is in the functional film layer to realize the printing of different patterns.
[0003] In the photovoltaic industry, the combination of woven metal screen and polyimide film is the most widely used, and is mainly used for printing fine grid lines of cell. With the need of cost reduction and technological innovation, the printing line width of fine grid lines has a decreasing trend year by year. In order to ensure that the screen still has good printing performance and the grid line does not interrupt at the screen yarn (i.e. broken grid), the woven metal screen usually undergoes etching during the manufacturing process of the screen, i.e. the wire diameter reduction process reduces the wire diameter of the metal screen. In addition, the woven metal screen and the polyimide film are generally connected by a glue layer, and the film layer has a certain bonding strength. For the polyimide film, the pattern (i.e. fine grid line) in the pattern area is usually completed by a laser equipment.
[0004] The aforementioned metal screen yarn, due to the wire diameter reduction after etching, the wire diameter is reduced, and the strength is quickly decreased. In addition, the chemical etching solution can cause hidden cracks, hydrogen embrittlement, etc. in the metal screen yarn, which affects the service life of the screen. When the polyimide film is cut by laser, the laser spot has high energy density, which can directly irradiate the metal screen yarn after breaking through the polyimide film and the glue layer, further enlarging the damage at the position of hidden cracks, hydrogen embrittlement, etc. after etching, and the defects reach submicron or micron level, further reducing the strength and service life. The glue layer bonding strength between the bonded polyimide film and the woven metal screen is not enough, and after continuous printing, problems such as polyimide film glue separation and pattern deformation occur, which also reduces the service life of the screen. Accordingly, the utility model provides a long-life fine line diameter printing screen. UTILITY MODEL CONTENTS
[0005] The utility model discloses a long life fine line diameter printing screen which is provided by the utility model to overcome the defects of the prior art, and the printing screen is coated by a coating technology, and a special coating film system is designed to coat the surface of the screen gauze.
[0006] To solve the above technical problems, the utility model discloses a long life fine line diameter printing screen, which comprises a second material screen and a polyimide film adhesive layer, and a first transition coating layer connected with the second material screen and a second transition coating layer connected with the polyimide film adhesive layer are arranged between the polyimide film adhesive layer and the second material screen, and a functional coating layer is arranged between the second transition coating layer and the first transition coating layer.
[0007] The utility model further sets up: the functional coating layer includes first functional coating layer and second functional coating layer.
[0008] The utility model further sets up: the first transition coating layer, second transition coating layer and functional coating layer all use magnetron sputtering coating or evaporation coating to realize.
[0009] The utility model further sets up: the thickness of first transition coating layer, second transition coating layer and functional coating layer all is submicron level.
[0010] The utility model further sets up: the coating layer material of first transition coating layer and second transition coating layer is one or above two kinds of alloy in chromium, nickel, titanium, aluminium.
[0011] The utility model further sets up: the coating layer thickness of first transition coating layer and second transition coating layer is 10 to 100nm.
[0012] The utility model further sets up: the functional coating layer is high laser damage threshold coating layer, the material of functional coating layer is one of silicon dioxide, hafnium dioxide, zirconium dioxide, diatomic aluminium fluoride, aluminium fluoride, and the thickness of functional coating layer is 20 to 100nm.
[0013] The utility model further sets up: the functional coating layer is high reflectivity coating layer, the material of functional coating layer is one of aluminium, copper, nickel, and the thickness of functional coating layer is 20 to 100nm.
[0014] In summary, the utility model has the following beneficial effects:
[0015] 1. The second material net (woven metal net) after etching has certain hydrogen embrittlement and hidden cracks. When a laser polyimide film is used to make a printing pattern area, the surface of the net yarn will inevitably be irradiated by high-energy density laser. The above defects will be enlarged, thereby affecting the service life of the screen and increasing the plating film system designed in the application. When laser irradiation is used, the defects are reduced, and the net yarn can be protected as much as possible from being damaged.
[0016] 2. The plating layer designed in the application has good adhesion with the second material net and the polyimide film adhesive layer, thereby increasing the bonding strength of the polyimide film and the second material net of the screen as a whole, and preventing the screen from being glued and deformed during long-time printing.
[0017] 3. The above two directions jointly promote the improvement of the service life of the screen. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION
[0019] In order to enable those skilled in the art to better understand the technical scheme of the utility model, the preferred embodiments of the utility model will be described below in combination with specific embodiments, but it should be understood that these descriptions are only for further illustrating the features and advantages of the utility model, and are not a limitation on the patent claims of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0020] The effect of the plating film system design application of the application will be illustrated by the following embodiments. The film system design of the application has various combination modes, and the plating film technology has various modes as described above, which is not limited to the following embodiments.
[0021] Comparative example: the screen etching treatment of the woven metal net yarn is not followed by plating.
[0022] The screen of the following embodiments is the same as that of the comparative example, and each plating layer is prepared by evaporation plating.
[0023] Example 1
[0024] Referring to Figure 1As shown, the long-life fine-diameter printing screen involved in this embodiment includes a second material screen 201 and a polyimide film adhesive layer 202. A first transition coating layer 101 connected to the second material screen and a second transition coating layer 103 connected to the polyimide film adhesive layer are provided between the polyimide film adhesive layer 202 and the second material screen 201. A functional coating layer is provided between the second transition coating layer 103 and the first transition coating layer 101. The functional coating layer includes a first functional coating layer 1021 and a second functional coating layer 1022.
[0025] The first transition plating layer 101 is a chromium-nickel alloy Ni. 80 Cr 20 The thickness is 25nm, and the second transition plating layer 103 is a chromium-nickel alloy Ni. 80 Cr 20 Thickness 25nm.
[0026] Example 2
[0027] See Figure 1 As shown, the long-life fine-diameter printing screen involved in this embodiment includes a second material screen 201 and a polyimide film adhesive layer 202. A first transition coating layer 101 connected to the second material screen and a second transition coating layer 103 connected to the polyimide film adhesive layer are provided between the polyimide film adhesive layer 202 and the second material screen 201. A functional coating layer is provided between the second transition coating layer 103 and the first transition coating layer 101. The functional coating layer includes a first functional coating layer 1021 and a second functional coating layer 1022.
[0028] The first transition plating layer 101 is a chromium-nickel alloy Ni. 80 Cr 20 The thickness is 25nm. The first functional plating layer 1021 is nickel with a thickness of 90nm, and the second transition plating layer 103 is a chromium-nickel alloy Ni. 80 Cr 20 Thickness 25nm.
[0029] Example 3
[0030] See Figure 1 As shown, the long-life fine-diameter printing screen involved in this embodiment includes a second material screen 201 and a polyimide film adhesive layer 202. A first transition coating layer 101 connected to the second material screen and a second transition coating layer 103 connected to the polyimide film adhesive layer are provided between the polyimide film adhesive layer 202 and the second material screen 201. A functional coating layer is provided between the second transition coating layer 103 and the first transition coating layer 101. The functional coating layer includes a first functional coating layer 1021 and a second functional coating layer 1022.
[0031] The first transition plating layer 101 is a chromium-nickel alloy Ni. 80 Cr20 The thickness is 25nm. The first functional coating 1021 is magnesium fluoride with a thickness of 63nm, and the second transition coating 103 is a chromium-nickel alloy Ni. 80 Cr 20 Thickness 25nm.
[0032] Example 4
[0033] See Figure 1 As shown, the long-life fine-diameter printing screen involved in this embodiment includes a second material screen 201 and a polyimide film adhesive layer 202. A first transition coating layer 101 connected to the second material screen and a second transition coating layer 103 connected to the polyimide film adhesive layer are provided between the polyimide film adhesive layer 202 and the second material screen 201. A functional coating layer is provided between the second transition coating layer 103 and the first transition coating layer 101. The functional coating layer includes a first functional coating layer 1021 and a second functional coating layer 1022.
[0034] The first transition plating layer 101 is a chromium-nickel alloy Ni. 80 Cr 20 The first functional coating 1021 is magnesium fluoride with a thickness of 25 nm, the second functional coating 1022 is nickel with a thickness of 90 nm, and the second transition coating 103 is a chromium-nickel alloy Ni. 80 Cr 20 Thickness 25nm.
[0035] The woven metal mesh of the screen printing plates of the above embodiments and comparative examples was observed using a scanning electron microscope. The surface morphology of the mesh at the laser scanning location was observed, and the improvement effect of the embodiments was evaluated by the proportion of surface micro-nano-level defects. The printing life of the screen printing plates was compared with those of the previous examples for further evidence, as shown in the table below. The effects of different embodiments on improving the adhesion strength between the polyimide film adhesive layer and the second material mesh (woven metal mesh) are also listed in the table below, where the average load in the peeling interval reflects the adhesion strength.
[0036] Screen Defect area ratio Print average life Peeling interval average load Example 1 About 50% 250,000 times 11.37N Example 2 Less than 10% 280,000 times 10.04N Example 3 Less than 10% 270,000 times 9.98N Example 4 Less than 5% 300,000 times 8.98N Comparative Example More than 90% 200,000 times 6.92N
[0037] Unless otherwise defined, all terms used in the disclosure, such as "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, are to be interpreted, unless otherwise indicated, in the case in which they are used in the present disclosure, based on the actual shown orientation or position relationship, only for the convenience of describing the present disclosure and simplifying the description, and therefore the orientation or position relationship described in the present disclosure is only used for exemplary description, and cannot be understood as a limitation on the present patent. The orientation or position relationship described in the present disclosure is only used for exemplary description, and cannot be understood as a limitation on the present patent. For those skilled in the art, the specific meaning of the above terms can be understood in combination with the embodiments and according to the specific circumstances.
[0038] Unless otherwise specified and limited, in the present disclosure, the terms "provided", "connected" and "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.
[0039] The above describes the preferred embodiments of the present disclosure in detail. It should be understood that those skilled in the art can make many modifications and changes to the present disclosure without creative labor. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the present disclosure shall be within the scope of protection determined by the claims.
Claims
1. A long-life fine-line, line-printing screen comprising a second material screen and a polyimide film gum layer, characterized in that, The polyimide film glue layer and the second material net are provided with a first transition plating layer connected with the second material net and a second transition plating layer connected with the polyimide film glue layer, and a functional plating layer is arranged between the second transition plating layer and the first transition plating layer.
2. The long-life fine-line line-coated printing form according to claim 1, characterized in that The functional plating layer comprises a first functional plating layer and a second functional plating layer.
3. The long-life fine-line line-coated printing form according to claim 1 or 2, characterized in that The first transition plating layer, the second transition plating layer and the functional plating layer are realized by using magnetron sputtering plating film or evaporation plating film.
4. The long-life fine-line line-coated printing form according to claim 3, characterized in that The thickness of the first transition plating layer, the second transition plating layer and the functional plating layer is submicron level.
5. The long-life fine-line line-coated printing form according to claim 1, wherein The plating layer material of the first transition plating layer and the second transition plating layer is one or more than two alloys of chromium, nickel, titanium and aluminum.
6. The long-life fine-line line-coated printing form according to claim 5, characterized in that The plating layer thickness of the first transition plating layer and the second transition plating layer is 10-100 nm.
7. The long-life fine-line line-coated printing form according to claim 1, characterized in that The functional plating layer is a high laser damage threshold plating layer; the material of the functional plating layer is one of silicon dioxide, hafnium dioxide, zirconium dioxide, aluminum oxide, magnesium fluoride and aluminum fluoride.
8. The long-life fine-line line-coated printing form according to claim 7, characterized in that The thickness of the functional plating layer is 20-100 nm.
9. The long-life fine-line line-coated printing form according to claim 1, wherein The functional plating layer is a high reflectivity plating layer; the material of the functional plating layer is one of aluminum, copper and nickel.
10. The long-life fine-line line-coated printing form according to claim 9, characterized in that The thickness of the functional plating layer is 20-100 nm.