Printing template

Abstract

The utility model is applicable to the technical field of printing stencils, and provides a printing stencil, which comprises a silk screen, screen cloth and an intermediate layer, the intermediate layer is used for fixedly connecting the silk screen with the screen cloth, the intermediate layer is provided with N strengthening areas and M non-strengthening areas, the rigidity of the strengthening areas is greater than that of the non-strengthening areas, and the M is greater than or equal to 1. The strengthening area and the non-strengthening area are arranged to be used for reducing the stress peak value when the printing template is used, and therefore the technical problem that silk threads in an existing gauze breadth deform is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the screen printing technical field especially relates to a printing stencil. BACKGROUND

[0002] In prior art, photovoltaic screen printing screen plate generally adopts single TPU (thermoplastic polyurethane elastomer, thermoplastic polyurethane rubber) material or hot melt PI (Polyimide Film, polyimide) film to bond screen and screen cloth, and the blade pressure acts on the screen in the printing process to make the screen boundary area prone to creep, and the screen line in the screen plane deforms, and repeated printing will lead to deformation accumulation. SUMMARY

[0003] Therefore, the utility model embodiment provides a printing stencil to solve the technical problem of screen line deformation in the screen plane.

[0004] The first aspect of the utility model embodiment provides a printing stencil, and the printing stencil comprises:

[0005] a screen;

[0006] a screen cloth, which is arranged around the screen;

[0007] and an interlayer, which is used to fixedly connect the screen and the screen cloth, and is provided with N reinforced areas and M non-reinforced areas, the rigidity of the reinforced areas is greater than that of the non-reinforced areas, and the reinforced areas and the non-reinforced areas are arranged to reduce the stress peak value when the printing stencil is used, wherein N is greater than or equal to 1, and M is greater than or equal to 1.

[0008] In a possible implementation manner of the first aspect, the rigidity difference of the reinforced areas and the non-reinforced areas is realized by adjusting material properties and / or geometric parameters; the adjustment of the material properties is realized by changing at least one of the following factors: base material type, composite material system and composite material ratio.

[0009] In a possible implementation manner of the first aspect, the reinforced areas are composed of a base material and a composite material, the base material of the reinforced areas is thermoplastic polyurethane, and the composite material of the reinforced areas is carbon fiber, and the weight of the carbon fiber accounts for 10%-30% of the weight of the material of the reinforced areas.

[0010] In a possible implementation manner of the first aspect, the non-reinforced areas are composed of a base material and a composite material, the base material of the non-reinforced areas is polyethylene, the composite material of the non-reinforced areas is silicone rubber, and the weight of the silicone rubber accounts for 15%-40% of the weight of the non-reinforced areas.

[0011] In a possible implementation manner of the first aspect, the elastic modulus of the reinforced area is 5 GPa-20 GPa, and the elastic modulus of the non-reinforced area is 0.1 GPa-3 GPa.

[0012] Or, the difference between the elastic modulus of the reinforced area and the elastic modulus of the non-reinforced area is greater than or equal to 4 GPa.

[0013] Or, the value of the elastic modulus of the reinforced area is greater than or equal to 1.2 times the value of the elastic modulus of the non-reinforced area.

[0014] In a possible implementation manner of the first aspect, the interlayer further comprises a transition area, and the reinforced area and the non-reinforced area are connected through the transition area.

[0015] In a possible implementation manner of the first aspect, the total width of the transition area is 10%-20% of the width of the interlayer.

[0016] In a possible implementation manner of the first aspect, the outer periphery of the screen extends inward by 1-10 mm to form a first connecting area, the outer periphery of the screen extends inward by 1-5 mm to form a second connecting area, and the first connecting area or the second connecting area is fixedly connected with the screen cloth through the reinforced area; and the reinforced area is ring-shaped.

[0017] In a possible implementation manner of the first aspect, when the screen is polygonal, the interlayer is provided with a plurality of corners corresponding to the polygon, and each corner is a chamfered structure.

[0018] In a possible implementation manner of the first aspect, based on a printing plane, a printing advancing direction is a first direction, and a direction perpendicular to the printing advancing direction is a second direction, the stiffness of the reinforced area in the first direction is greater than the stiffness in the second direction.

[0019] The printing template of the present application forms an elastic modulus gradient structure by constructing the reinforced area and the non-reinforced area in the interlayer, and reduces the stress peak value of the screen through the synergistic effect of the reinforced area and the non-reinforced area. Thus, the technical problem of deformation of the screen lines in the screen width is solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1A structural schematic diagram of a printing stencil of the present application;

[0022] Figure 2 Another structural schematic diagram of a printing stencil of the present application;

[0023] Figure 3 A distribution schematic diagram of reinforced areas and non-reinforced areas of a printing stencil of the present application;

[0024] Figure 4 Another distribution schematic diagram of reinforced areas of a printing stencil of the present application;

[0025] Figure 5 A structural schematic diagram of reinforced areas, non-reinforced areas and transition areas of a printing stencil of the present application.

[0026] In the figure: 1 - mesh cloth; 2 - silk screen; 3 - intermediate layer; 12 - inner periphery of the mesh cloth; 11 - outer periphery of the mesh cloth; 13 - hollow area; 21 - outer periphery of the silk screen; 31 - outer periphery of the intermediate layer; 32 - inner periphery of the intermediate layer; 33 - inner periphery area of the intermediate layer; 34 - outer periphery area of the intermediate layer; 41 - reinforced area; 42 - transition area; 43 - non-reinforced area; 431 - non-reinforced area a; 432 - non-reinforced area b DETAILED DESCRIPTION

[0027] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be clearly described below in combination with the drawings 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. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0028] The terms "comprise", "comprising", "include", "including" and any variations thereof in the specification and in the claims of the present application and the above drawings are intended to cover non-exclusive inclusion. For example, a process, method or system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0029] The present application provides a printing stencil to solve the technical problem of deformation of silk threads in the existing silk screen surface.

[0030] As Figure 1 And Figure 3As shown, in an embodiment, the printing template comprises a silk screen 2, a mesh cloth 1 arranged around the silk screen 2, and an interlayer 3 for fixedly connecting the silk screen 2 and the mesh cloth 1, the interlayer 3 is provided with N reinforced areas 41 and M non-reinforced areas 43, the rigidity of the reinforced areas 41 is greater than that of the non-reinforced areas 43, wherein N is greater than or equal to 1, and M is greater than or equal to 1. The non-reinforced areas 43 are arranged corresponding to the reinforced areas, and the non-reinforced areas 43 are defined as the areas of the interlayer other than the reinforced areas. The reinforced areas or the softened areas can be arranged as a whole, or as several groups with different rigidity. Figure 4 As shown, the non-reinforced areas can be arranged as a whole as shown in Figure 3 As shown, the non-reinforced areas can be arranged as a whole as shown in Figure 3 The reinforced areas are arranged to have high rigidity modulus to inhibit deformation, and the non-reinforced areas 43 are arranged to have low rigidity to maintain overall flexibility. The interlayer can be arranged as a continuous ring or as several separate ones to achieve the effect of fixedly connecting the silk screen and the mesh cloth.

[0031] By arranging the reinforced areas 41 and the non-reinforced areas 43 in the interlayer 3, the interlayer 3 is fixedly connected with the silk screen 2 and the mesh cloth 1, a rigidity gradient structure, a strength gradient structure or an elastic modulus gradient structure is formed in the interlayer 3, and through the synergistic effect of the reinforced areas 41 and the non-reinforced areas 43, the stress peak value borne by the silk screen 2 during printing can be reduced, so that the stress does not reach the stress threshold borne by the silk thread of the silk screen 2, thereby reducing the probability of creep of the boundary area of the silk screen 2, avoiding the tearing of the adhesive layer of the silk screen 2 in the stress concentration area caused by repeated printing, improving the structural stability, and reducing the possibility of deformation of the silk thread of the silk screen 2, thereby solving the technical problem of silk thread deformation in the plane of the existing silk screen 2. In addition, the interlayer 3 is arranged to have high rigidity areas to inhibit edge deformation and low rigidity areas to maintain overall flexibility, which significantly improves the service life and printing accuracy of the printing template.

[0032] It should be noted that the N reinforced areas represent that in the actual application to the printing template, it can be arranged as one or more according to actual needs, wherein reference is made to Figure 3 and Figure 4 As shown, the reinforced areas can be arranged as a plurality of points or as a ring around the silk screen. Without being limited to Figure 3 , Figure 4 The reinforced areas can also be arranged as one point, a plurality of rings around the silk screen, a plurality of arcs, etc.

[0033] Optionally, the rigidity difference between the reinforced areas 41 and the non-reinforced areas 43 is realized by adjusting the material property difference and / or the geometric parameter difference; the adjustment of the material property difference is realized by changing at least one of the following factors: base material type, composite material system, and composite material ratio.

[0034] In the above embodiments, the stiffness difference is achieved by the combination of material property difference (elastic modulus, reinforcing phase ratio) and geometric parameter difference (shape, thickness, interface structure). In addition, the process technology is the technical path to regulate the above two types of parameters. Various different materials, different processes, different thicknesses and different shapes of various materials can be selected, as long as the hardness of the strengthened area of the selected material applied to the interlayer can suppress the edge deformation, and the non-strengthened area 43 can maintain the overall flexibility.

[0035] Optionally, the thickness of the strengthened area and the non-strengthened area 43 is consistent.

[0036] When consistent, the production error caused by the need to maintain inconsistency during the production of the printing template can be reduced, and the strength error caused by the thickness production error can be avoided.

[0037] Optionally, as shown in Figure 2 The mesh cloth 1 is provided with a mesh setting area, and the silk screen 2 is fixedly arranged on the mesh setting area of the mesh cloth. The outer periphery 21 of the silk screen 2 is fixedly arranged on the mesh cloth 1 through the strengthened area 41.

[0038] Among them, the mesh setting area is arranged on the mesh cloth 1, and the outer periphery of the silk screen 2 is fixed through the strengthened area 41, that is, the distribution area of the strengthened area 41 covers the high stress concentration area of the silk screen 2, and in addition, it can also form a block-block-block fixed connection, so as to avoid pulling a single silk screen 2, and to evenly distribute the stress of the silk thread of the entire silk screen 2.

[0039] In Figure 2 , the inner periphery 32 of the interlayer 3 and the outer periphery 31 of the interlayer 3 enclose the interlayer 3, and the inner periphery 12 of the mesh cloth 1 and the outer periphery 11 of the mesh cloth 1 enclose the mesh cloth.

[0040] It should be noted that the outer periphery at this time is not only a boundary, but also refers to Figure 1 and Figure 2 As shown, in the entire silk screen 2, the area where the outer periphery extends inward by a certain distance is the outer periphery area 34, and similarly, the inner periphery can also refer to the area where the inner periphery extends outward by a certain distance as the inner periphery area 33.

[0041] Optionally, the mesh cloth inner periphery covers the inner periphery 32 of the interlayer.

[0042] Referring to Figure 2 , the above arrangement makes the mesh cloth inner periphery exceed the inner periphery 32 of the interlayer, so that the interlayer can be completely fixed on the mesh cloth, thereby enhancing the firmness of the interlayer fixedly connected to the mesh cloth and avoiding industrial production errors.

[0043] Optionally, the non-strengthened area 43 and the strengthened area 41 are integrally arranged.

[0044] Optionally, the non-reinforced area 43 is fixed on the mesh cloth 1.

[0045] The integral arrangement can be an integral molding arrangement. The integral arrangement reduces the uneven tension that can exist in the interlayer 3, ensures that the outer periphery of each mesh 2 is fixed by equal tension, and further fixes the non-reinforced area 43 on the mesh cloth 1, which increases the contact area between the mesh cloth 1 and the interlayer 3, better forms the elastic modulus gradient structure, and thus ensures uniform stress of the mesh cloth 1.

[0046] In the first optional embodiment, the elastic modulus of the reinforced area 41 is 5 GPa-20 GPa, and the elastic modulus of the non-reinforced area 43 is 0.1 GPa-3 GPa.

[0047] In the second optional embodiment, the difference between the elastic modulus of the reinforced area 41 and the elastic modulus of the non-reinforced area 43 is greater than or equal to 4 GPa.

[0048] In the third optional embodiment, the value of the elastic modulus of the reinforced area 41 is greater than or equal to 1.2 times the value of the elastic modulus of the non-reinforced area 43.

[0049] In actual use, any one or more of the embodiments of the above-mentioned first to third embodiments of the elastic modulus value range can be comprehensively selected, and the effects achieved by the present application can be achieved.

[0050] Optionally, referring to FIG. 1, Figure 5 The interlayer 3 further includes a transition area 42, and the reinforced area 41 and the non-reinforced area 43 are connected through the transition area 42.

[0051] The transition layer can reduce stress concentration. The transition area 42 can be formed by stacking and hot pressing the reinforced area 41 and the non-reinforced area 43, or a material between the reinforced area 41 and the non-reinforced area 43.

[0052] Optionally, the non-reinforced area 43 is integrally arranged with the reinforced area 41 and the transition area 42.

[0053] Optionally, the transition area 42 is provided with a gradient structure to smoothly transition the mechanical properties of the interlayer 3.

[0054] Optionally, the gradient structure can be a two-stage trapezoidal transition structure.

[0055] Optionally, the reinforced area 41 is composed of a base material and a composite material. The base material of the reinforced area 41 is thermoplastic polyurethane (TPU), and the composite material of the reinforced area 41 is carbon fiber. The weight of the carbon fiber accounts for 10%-30% of the weight of the material of the reinforced area 41.

[0056] The above-mentioned selected reinforced area can achieve a good reinforcement effect and reduce the deformation of the mesh.

[0057] Optionally, the non-reinforced area 43 is composed of a base material and a composite material, the base material of the non-reinforced area 43 is polyethylene (PE), and the composite material of the non-reinforced area 43 is silicone rubber, and the weight of the silicone rubber accounts for 15%-40% of the weight of the non-reinforced area 43.

[0058] The selected non-reinforced area 43 can achieve better reinforcement effect and reduce the deformation of the screen.

[0059] Optionally, the total width of the transition area 42 is 10%-20% of the width of the interlayer 3.

[0060] It should be noted that the above is the preferred material and material composition with better effect in the test. In actual implementation, the same process and different materials can be used to manufacture the reinforced area 41 and the non-reinforced area 43, or the same material but different processes can be used to manufacture the reinforced area 41 and the non-reinforced area 43, or different materials and different processes can be used to manufacture the reinforced area 41 and the non-reinforced area 43. The materials can be selected from the following types: silicone rubber (0.01 GPa-0.1 GPa), polyethylene (PE, about 0.1 GPa-0.5 GPa), polyacrylate (about 0.3 GPa-1.5 GPa), TPU (about 1 GPa-3 GPa), polypropylene (PP, about 1 GPa-2 GPa), ABS resin (about 2 GPa-3 GPa), etc. The process can be selected from the following types: coating, lamination, hot melting, chemical crosslinking, etc.

[0061] In an optional embodiment, the outer periphery 21 of the screen 2 extends inward by 1-10 mm to form a first connecting area, the outer periphery of the screen 2 extends inward by 1-5 mm to form a second connecting area, and the first connecting area or / and the second connecting area is fixedly connected with the mesh cloth 1 through the reinforced area 41; the reinforced area 41 is a ring shape.

[0062] The range of the connecting area can better ensure the fixed connection area of the interlayer 3 with the screen 2 and the mesh cloth 1, improve the structural stability, and ensure uniform stress.

[0063] In an optional embodiment, when the screen 2 is a polygon, the interlayer 3 is provided with a plurality of corners corresponding to the polygon, and each corner is a chamfered structure.

[0064] Since the corner is subjected to stress in two directions, the chamfered structure can strengthen the structure of each corner area, thereby improving the stress that each corner can withstand, avoiding the tearing of the adhesive layer, and improving the anti-deformation ability of the interlayer 3.

[0065] In an optional embodiment, based on the printing plane, the printing forward direction is a first direction, and the printing direction is a second direction, and the first direction is perpendicular to the second direction. Figure 5As shown, the direction indicated by the central arrow is the first direction, and the direction perpendicular to the printing direction is the second direction, and the stiffness of the reinforcing area 41 in the first direction is greater than the stiffness in the second direction.

[0066] In this embodiment, the stiffness at this time refers to the actual strength, and at this time, there are two cases: the strength of the same reinforcing area 41 in the first direction is greater than the strength in the second direction, and the strength of different reinforcing areas 41, that is, the strength of the reinforcing area 41 extending and distributed in the first direction is greater than the strength of the reinforcing area 41 extending and distributed in the second direction, wherein the extension and distribution in the first direction means distribution in the extension direction of the central arrow.

[0067] When specifically setting, the strength of the reinforcing area 41 in the first direction can be greater than the strength in the second direction by setting the width of the reinforcing area in the first direction to be wider than the width in the second direction, setting the distribution density of the reinforcing area in the first direction to be higher than the distribution density of the reinforcing area in the second direction, setting the reinforcing area in the first direction to be closer to the screen area, setting the reinforcing area in the first direction to be longer, setting the material of the reinforcing area distributed in the first direction to be stronger, and setting the manufacturing process of the reinforcing area distributed in the first direction to be stronger.

[0068] The above setting can greatly improve the tensile strength of the reinforcing area 41 in the first direction to meet the needs of the printing process.

[0069] In an embodiment, the screen is a metal screen, which can be composed of Ni material, and the mesh of the screen is micro-nano level. The metal screen is fixedly connected to the PI screen cloth through an intermediate layer, and the stress peak value of the printing template during use is reduced by setting the reinforcing area and the non-reinforcing area 43 in the intermediate layer, the deformation of the metal screen during printing is relieved, and the service life of the printing template is prolonged. In other embodiments, the metal screen can also be formed of Ni-Co alloy material, or composed of one or more of Cu, Ni, Ni-P, Ni-Fe, Ni-Co-Cu, Ni-Cr, Cr, and Cr-Cu.

[0070] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A printing template, characterized in that, The printing template includes: silk screen; A mesh fabric, wherein the mesh fabric is arranged around the wire mesh; In addition, an intermediary layer is provided for fixing the screen to the mesh fabric. The intermediary layer is provided with N reinforced zones and M unreinforced zones. The stiffness of the reinforced zones is greater than that of the unreinforced zones. The reinforced zones and the unreinforced zones are configured to reduce the stress peak when the printing template is used, wherein N is greater than or equal to 1 and M is greater than or equal to 1.

2. The printing template as described in claim 1, characterized in that, The difference in material stiffness between the reinforced region and the unreinforced region is achieved by adjusting the material properties and / or geometric parameters; the adjustment of the material properties is achieved by changing at least one of the following factors: substrate type, composite material system, and composite material ratio.

3. The printing template as described in claim 2, characterized in that, The reinforced region is composed of a substrate and a composite material. The substrate of the reinforced region is thermoplastic polyurethane, and the composite material of the reinforced region is carbon fiber. The weight of the carbon fiber accounts for 10%-30% of the weight of the material in the reinforced region.

4. The printing template as described in claim 2, characterized in that, The unreinforced region is composed of a substrate and a composite material. The substrate of the unreinforced region is polyethylene, and the composite material of the unreinforced region is silicone rubber. The weight of the silicone rubber accounts for 15%-40% of the weight of the unreinforced region.

5. The printing template as described in claim 2, characterized in that, The elastic modulus of the reinforced region is 5 GPa-20 GPa, and the elastic modulus of the unreinforced region is 0.1 GPa-3 GPa. Alternatively, the difference between the elastic modulus of the reinforced region and the elastic modulus of the unreinforced region is greater than or equal to 4 GPa; Alternatively, the elastic modulus of the reinforced region is greater than or equal to 1.2 times the elastic modulus of the unreinforced region.

6. The printing template as described in claim 1, characterized in that, The intermediary layer also includes a transition region, through which the reinforced region and the non-reinforced region are connected.

7. The printing template as described in claim 6, characterized in that, The total width of the transition zone is 10%-20% of the width of the intermediate layer.

8. The printing template as described in any one of claims 1-7, characterized in that, The outer periphery of the wire mesh extends inward by 1-10mm to form a first connecting area, and the outer periphery of the wire mesh extends inward by 1-5mm to form a second connecting area. The first connecting area and / or the second connecting area are fixedly connected to the mesh fabric through the reinforcing area; the reinforcing area is roughly annular.

9. The printing template as described in any one of claims 1-7, characterized in that, When the mesh is polygonal, the intermediary layer has multiple corners corresponding to the polygon, and each corner is a chamfered structure.

10. The printing template according to any one of claims 1-7, characterized in that, Based on the printing plane, the printing forward direction is the first direction, and the direction perpendicular to the printing forward direction is the second direction. The stiffness of the reinforced area in the first direction is greater than the stiffness in the second direction.

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