CN215882972U - Printing screen - Google Patents

Abstract

The application discloses printing half tone, include the screen frame and fix the screen cloth on the screen frame, the screen cloth is interweaved by warp and weft and forms, be formed with a plurality of net knots, the warp line footpath and the weft line footpath of net knot department refine respectively and diminish, warp and weft mutually not perpendicular, be equipped with at least one predetermined yarn pattern district that goes on the screen cloth, only include warp or weft in the predetermined yarn pattern district that goes, the screen cloth coats and is stamped macromolecular material layer, correspond on the macromolecular material layer and be equipped with at least one opening pattern in the region of predetermined yarn pattern district that goes, only include warp or weft in the predetermined yarn pattern district that goes in the opening pattern. The warp or weft in the opening pattern of the printing screen is in an inclined screen state, so that the resistance to printing ink is reduced, the accuracy of a printed pattern is improved, the fluctuation of the height is reduced, and the opening pattern with various shapes can be adapted by adjusting the rotating angle between the warp and weft; the screen cloth can adopt a combined type screen cloth of a Teddulon screen cloth and a metal screen cloth, which is more beneficial to printing finger-shaped electrodes and saves the manufacturing cost.

Description

Printing screen

Technical Field

The utility model relates to the technical field of printing screens, in particular to a printing screen capable of adjusting longitude and latitude angles in cooperation with a graph.

Background

In the prior art, a printing screen is usually used to print the electrode pattern of the solar cell, and the pattern required at present is increasingly finer. However, the screen nodes are easily blocked by the interlaced warp and weft of the printing screen. Therefore, in the prior art, a mesh-knot-free design is adopted, the pattern is opened in two parallel warps or wefts, the ink permeability is increased, but the printed line type has large height and low undulation, and the problems of line breakage or over high impedance are easily caused.

On the other hand, in a prior art printing screen structure schematically shown in fig. 1, the printing screen 2 includes a frame 21, a mesh 22 and a polymer material layer 23 formed on the mesh 22, and the opening pattern 231 is formed on the polymer material layer 23. In the prior art, the warp 221 in the opening pattern 231 is etched and removed by etching or laser process to avoid forming the network of the warp 221 and the weft 222 in the opening pattern 231. However, in the prior art printing screen structure, since the opening pattern 231 is the solar Finger electrode (Finger line) shown in fig. 1, the left straight line portion of the L-shaped pattern is perpendicular to the weft 222, which may cause the ink to be blocked by the weft during printing, which may result in large height and undulation of the printed pattern, and may cause the printed Finger electrode pattern to have too high impedance, resulting in low power generation efficiency. On the other hand, if the warp 221 in the opening pattern 231 is removed, only the weft 222 will remain in the L-shaped bottom of the opening pattern 231, which may cause the ink to be blocked by the weft 222 during printing, and also may cause the printed pattern to have too high impedance and low power generation efficiency.

As can be seen from the above-mentioned prior art, the current screen printing plate structure with no mesh knots and woven vertically by warps and wefts in the opening pattern can print out a pattern with a thinner line width, but cannot increase the efficiency of the solar finger electrode, and some patterns are not suitable for the screen printing plate structure with mutually vertical warps and wefts. Therefore, it is desirable to provide a printing screen capable of matching with the rotating warp and weft yarns of the pattern, so as to print the low-step lines while achieving no net knots in the opening pattern.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a printing screen, which is characterized in that the warps and the wefts at the net knots on a screen cloth are subjected to fine line processing, the warps or the wefts are favorably rotated, the warps and the wefts are rotated by a rotating angle and are not mutually perpendicular, so that the printing screen with an inclined net is produced, the warps or the wefts which are only included in opening patterns formed on the inclined net printing screen are in an inclined net state, namely, form a certain included angle with the printing direction of ink, the resistance to the ink is further reduced, the printed pattern precision is improved, the height fluctuation is reduced, and the rotating angle between the warps and the wefts can be adjusted to adapt to opening patterns of various shapes. Also provides a device for rotating warp or weft in the mesh.

In order to realize the purpose of the utility model, the utility model provides a printing screen, which comprises a screen frame and screen cloth fixed on the screen frame, wherein the screen cloth comprises a plurality of parallel warps and a plurality of parallel wefts, the warps and the wefts are interwoven to form a plurality of net knots, the diameters of the warps are thinned and reduced, the diameters of the wefts are thinned and reduced, the warps and the wefts are not perpendicular to each other, at least one preset yarn removing pattern area is arranged on the screen cloth, only the warps or the wefts are included in the preset yarn removing pattern area, one side of the screen cloth is provided with a high polymer material layer, at least one opening pattern is arranged in an area corresponding to the preset yarn removing pattern area on the high polymer material layer, and the opening pattern only includes the warps or the wefts in the preset yarn removing pattern area.

Further, at the net knot, the diameter of the warp is thinned to 51% -99% of the original diameter, and the diameter of the weft is thinned to 51% -99% of the original diameter.

Further, the original line diameter of the warp is d1, the thinning line diameter of the warp at the corresponding mesh node is d1 ', the original line diameter of the weft is d2, the thinning line diameter of the weft at the corresponding mesh node is d 2', and the included angle theta between the warp and the weft is 90+ arctan { ((d1-d1 '+ d2-d 2')/2)/d 1 '} degree or 90-arctan { ((d1-d 1' + d2-d2 ')/2)/d 1' } degree.

Furthermore, the screen cloth comprises a Teflon screen cloth and a metal screen cloth, the Teflon screen cloth is fixedly connected with the screen frame, an opening is formed in the Teflon screen cloth, the metal screen cloth is fixedly connected with the Teflon screen cloth, the metal screen cloth covers the opening in the Teflon screen cloth, and the high polymer material layer and the preset yarn removing pattern area are arranged on the metal screen cloth.

Further, the area of the predetermined deglaze pattern area is 2 to 20 times the area of the opening pattern.

Further, the area of the predetermined yarn removing pattern area is 2 to 4 times of the area of the opening pattern.

Further, the diameters of the warp threads and the weft threads are respectively 9-16 μm; the included angle theta between the warp and the weft is 100 degrees to 130 degrees.

Compared with the prior art, the application has at least one or more of the following advantages:

according to the printing screen plate, the warps and the wefts at the net knots on the screen cloth are subjected to fine line processing, the warps or the wefts are more favorably rotated, the warps and the wefts are rotated by a rotation angle and are not mutually vertical, so that the printing screen plate with the inclined net is produced, the warps or the wefts formed in the opening patterns on the inclined net printing screen plate are in an inclined net state, even if the warps or the wefts only stored in the opening patterns have a certain included angle with the printing direction of ink, the resistance to the ink is further reduced, the printed pattern precision is improved, the height fluctuation is reduced, and the rotation angle between the warps and the wefts can be adjusted to adapt to the opening patterns in various shapes; when the diameter of the thinned warp or weft is not less than 50% of the original diameter, the structural strength of the warp and weft can be maintained; when the diameter of the thinned warp or weft is lower than 50% of the original diameter, the number of the warps and the wefts in the unit area of the screen cloth can be increased, and the tension and the structural strength of the screen cloth are kept; the screen cloth can adopt a combined type screen cloth of a Teddulon screen cloth and a metal screen cloth, is more beneficial to printing finger-shaped electrodes, and can further save the manufacturing cost of the screen printing plate.

Drawings

FIG. 1 is a schematic diagram of a prior art printing screen;

fig. 2 is a schematic structural diagram of a printing screen according to an embodiment of the present application;

FIG. 3 is an enlarged schematic view of an original mesh knot according to an embodiment of the present disclosure;

FIG. 4 is an enlarged schematic structural diagram of a mesh junction after etching and thinning according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a printing screen provided in the second embodiment of the present application;

fig. 6 is a schematic structural diagram of a printing screen provided in the third embodiment of the present application;

fig. 7 is a flowchart of a method for manufacturing a printing screen according to a fourth embodiment of the present application;

fig. 8 is a schematic view of a structure of a printing screen according to a fourth embodiment of the present application.

The screen printing method comprises the following steps of 1-printing screen, 11-screen frame, 12-screen cloth, 121-warp, 122-weft, 123-screen knot, 124-Teddulon screen cloth, 125-metal screen cloth, 126-composite edge, 13-high polymer material layer, 131-opening pattern, 14-emulsion layer, A-preset yarn removing pattern area, d 1-original line diameter of warp, d1 '-refined line diameter of warp, d 2-original line diameter of weft, d 2' -refined line diameter of weft, theta-rotation angle, 2-printing screen, 21-screen frame, 22-screen cloth, 221-warp, 222-weft, 23-high polymer material layer and 231-opening pattern.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the utility model, the following detailed description is given to the specific embodiments, structures, features and effects of the present invention in conjunction with the accompanying drawings and preferred embodiments.

Example one

As shown in fig. 2, the present embodiment provides a printing screen 1, which includes a screen frame 11 and a screen cloth 12 fixed on the screen frame 11. The mesh cloth 12 is obtained by interweaving a plurality of parallel warps 121 and a plurality of parallel wefts 122. The interweaving position of any warp 121 and all weft 122 forms a net knot 123, and then a plurality of net knots 123 are formed on the mesh cloth 12. One side surface of the mesh cloth 12 serves as a scraper surface, and the other side surface of the mesh cloth 12 serves as a pasting and printing surface. The original diameter of the warp 121 is defined as d1, and the original diameter of the weft 122 is defined as d2, as shown in fig. 3. The mesh 123 is etched by an etching process, so that the diameter of the warp thread 121 at the mesh 123 is reduced, the reduced diameter of the warp thread 121 is defined as d1 ', the diameter of the weft thread 122 is reduced, and the reduced diameter of the weft thread 122 is defined as d 2', as shown in fig. 4. It should be noted that the position relationship of the warp threads 121 and the weft threads 122 after the mesh knots 123 are thinned in fig. 4 is only illustrated for convenience, and the warp threads 121 and the weft threads 122 can be tightly locked together after being relatively rotated as described below.

The screen printing plate 1 of the present application can be applied to a fine-diameter screen printing plate, that is, the diameter of the warp 121 and the weft 122 can be 9 μm to 16 μm, so as to match with finer pattern production.

In this embodiment, the thinned diameter of the warp 121 and the weft 122 is preferably not less than 50% of the original diameter to maintain the structural strength of the warp 121 or the weft 122, for example, the thinned diameter d1 'of the warp 121 is 51-99% of the original diameter d1 of the warp 121, and the thinned diameter d 2' of the weft 122 is 51-99% of the original diameter d2 of the weft 122. It should be noted that, the above is only a preferred solution, and if the refined diameter of the warp 121 and the weft 122 is less than 50% of the original diameter, the number of the warp 121 and the weft 122 per unit area of the mesh cloth 12 can also be changed, for example, increased to 360-.

The warp 121 and the weft 122 are not perpendicular to each other, that is, the warp 121 and the weft 122 which are perpendicular to each other after weaving are relatively rotated by a set angle θ 1, so that an included angle θ is formed between the warp 121 and the weft 122, as shown in fig. 2. The included angle theta is determined by the line diameters d1 and d1 'of the warp threads 121 and the line diameters d2 and d 2' of the weft threads 122, and is 90+ arctan { ((d1-d1 '+ d2-d 2')/2)/d 1 '} degrees or 90-arctan { ((d1-d 1' + d2-d2 ')/2)/d 1' } degrees. The included angles between the warp and the weft are two, one is an acute angle, and the other is an obtuse angle, so that the purpose of adopting +/-signs in the formula is to represent any one of the two included angles between the warp and the weft.

In other words, in the present embodiment, the warp threads 121 and the weft threads 122 at the mesh junction 123 are etched and thinned, so that the warp threads 121 and the weft threads 122 become looser at the mesh junction 123, which facilitates the relative rotation between the subsequent warp threads 121 and the weft threads 122, and further the warp threads 121 and the weft threads 122 are not arranged vertically, and the rotation angle θ 1 between the warp threads 121 and the weft threads 122 is determined according to the thread diameter difference between the original thread diameter and the thinned thread diameter of the warp threads 121 and the weft threads 122, where the thread diameter difference is d1-d1 ', d2-d2 ', and the calculation formula of the rotation angle is arctan { ((d1-d1 ' + d2-d2 ')/2)/d 1 ' }. The rotation angle values corresponding to several groups of line diameter differences between 2 μm and 9 μm are listed in the form of a table below, and are specifically shown in the following table 1:

difference of wire diameter	Angle of rotation theta 1
		2μm	10.3 degree
3μm	12.99 degree
		4μm	23.96 degree
5μm	24.44 degree
		7μm	37.87 degrees
9μm	39.29 degree

TABLE 1

As can be seen from table 1, the rotation angle θ 1 may be any angle in the range of 10 degrees to 40 degrees. Therefore, the rotation angle θ 1 of the warp 121 and the weft 122 is preferably 10 degrees to 40 degrees, i.e., the included angle θ between the warp 121 and the weft 122 is preferably in the range of 100 degrees to 130 degrees.

The mesh cloth 12 is provided with at least one predetermined yarn removing pattern area a, and the predetermined yarn removing pattern area a only has warp threads 121 or weft threads 122. The mesh cloth 12 is covered with a polymer material layer 13. At least one opening pattern 131 is arranged in the area of the high polymer material layer 13 corresponding to the preset yarn removing pattern area A. It should be noted that the opening pattern 131 may be located at any position in the area corresponding to the predetermined doffing pattern area a, such as the center of the area, or other positions other than the center. Since the predetermined deglaze pattern area a has only warp threads 121 or weft threads 122, the corresponding pattern of openings 131 also has only warp threads 121 or weft threads 122, as shown in fig. 2, which only schematically illustrates a structure of the printing screen 1 including only weft threads 122. Preferably, the area of the predetermined deglaze pattern area a is 2 to 20 times, more preferably 2 to 4 times, the area of the opening pattern 131 to facilitate the formation of the opening pattern 131. In this embodiment, the warp 121 or the weft 122 may be made of a metal material, such as stainless steel or tungsten steel. It should be noted that the L-shaped opening pattern 131 shown in fig. 2 is only for convenience of illustration and the setting position is adjusted, and in the specific implementation, the opening pattern 131 may be located at a position corresponding to the center of the predetermined yarn removing pattern area a or other positions.

Therefore, although in the present embodiment, the opening pattern 131 also includes only the warp 121 or the weft 122, because the warp 121 or the weft 122 in the opening pattern 131 is in an oblique net state and forms a certain angle with the printing direction of the ink, the warp 121 or the weft 122 has a small resistance to the ink during printing, and the printed pattern is precise and has small height and undulation, and particularly, the technical solution of the present embodiment is applicable to opening patterns 131 with various shapes.

Example two

As shown in fig. 5, the warp threads 121 in this embodiment are woven parallel to the Y-axis in space, while the weft threads 122 are woven in an inclined manner. As in the first embodiment, the mesh cloth 12 is formed by interweaving the warp threads 121 and the weft threads 122 at the mesh knots 123, and each of the warp threads 121 and each of the weft threads 122 are also thinned, and the warp threads 121 and the weft threads 122 have an included angle theta. The opening pattern 131 shown in fig. 5 has a plurality of strip rectangles arranged at intervals, and the length direction of the opening pattern 131 is consistent with the direction of the warp threads 121, so that the weft threads 122 in the opening pattern 131 are inclined, which is more beneficial for printing the finger electrodes.

EXAMPLE III

Unlike the other two first and second embodiments, the web 12 is a composite web. As shown in fig. 6, the mesh cloth 12 includes a teflon mesh cloth 124 and a metal mesh cloth 125, and the teflon mesh cloth 124 is fixedly connected to the frame 11. The teflon mesh cloth 124 is provided with an opening, the metal mesh cloth 125 is fixedly connected with the teflon mesh cloth 124, and the metal mesh cloth 125 covers the opening of the teflon mesh cloth 124, so that a composite edge 126 is formed between the teflon mesh cloth 124 and the metal mesh cloth 125. The polymer material layer 13 and the predetermined yarn removing pattern area a are disposed on the metal mesh cloth 125. The structure of the metal mesh cloth 125 is the same as the mesh cloth 12 in the second embodiment, and the composite mesh cloth and the opening pattern 131 are adopted, so that the manufacturing cost of the printing screen 1 can be further saved while the finger-shaped electrodes are printed.

Example four

The present embodiment provides a method for manufacturing a printing screen, as shown in fig. 7, the method includes the following steps:

step S1: interweaving a plurality of warp threads 121 arranged in parallel and a plurality of weft threads 122 arranged in parallel in an up-down staggered manner to form the mesh cloth 12, wherein the diameter of the warp threads 121 is d1, namely the original diameter d1 of the warp threads 121, and the diameter of the weft threads 122 is d2, namely the original diameter d2 of the weft threads 122;

step S2: pressing the mesh cloth 12 to enable the warp threads 121 and the weft threads 122 to be mutually clamped, and forming mesh knots 123 between the warp threads 121 and the weft threads 122;

step S3: etching the net knots 123 by an etching process, so that the line diameter of the warp threads 121 corresponding to the positions of the net knots 123 is thinned to be d1 ', and the line diameter of the weft threads 122 corresponding to the positions of the net knots 123 is thinned to be d 2';

step S4: rotating the warp 121 or the weft 122 by using a rotating device, namely keeping the direction of the warp 121 stationary, moving both ends of the mesh cloth 12 in the direction of the weft 122 in a staggered manner in the direction of the warp 121, or keeping the direction of the weft 122 stationary, moving both ends of the mesh cloth 12 in the direction of the warp 121 in a staggered manner in the direction of the weft 122, so that an included angle θ is formed between the warp 121 and the weft 122. The included angle theta is 90+ arctan { ((d1-d1 '+ d2-d 2')/2)/d 1 '} degree or 90-arctan { ((d1-d 1' + d2-d2 ')/2)/d 1' } degree. Namely, the rotation angle θ 1 between the warp 121 and the weft 122 is arctan { ((d1-d1 ' + d2-d2 ')/2)/d 1 ' } degree.

Step S5: stretching and fixing the mesh cloth 12 formed in the step S4 on a mesh frame 11 to form a semi-finished printing screen;

step S6: coating emulsion on the mesh cloth 12 of the semi-finished screen printing plate to form an emulsion layer 14, arranging at least one preset yarn removing pattern area A on the mesh cloth 12, and carrying out exposure and development processing on the mesh cloth 12 in the preset yarn removing pattern area A;

step S7: removing the warp 121 or weft 122 of the mesh fabric 12 in the predetermined doffing pattern area a by an etching process, wherein the removed structure is shown in fig. 8;

step S8: removing the emulsion layer 14 from the web 12;

step S9: coating a high polymer material on the mesh cloth 12 to form a high polymer material layer 13;

step S10: forming at least one opening pattern 131 in the area of the polymer material layer 13 corresponding to the predetermined yarn-removing pattern area a by an etching process to form a finished printing screen.

Preferably, in step S1, the original wire diameters d1 and d2 of the warp 121 and weft 122 may be any values in the range of 9 μm to 16 μm. In step S3, at the mesh node, the diameter of the warp becomes smaller to 51% -99% of the original diameter, and the diameter of the weft becomes smaller to 51% -99% of the original diameter. In step S4, the included angle θ between the warp threads 121 and the weft threads 122 is 100 degrees to 130 degrees, that is, the rotation angle θ 1 between the warp threads 121 and the weft threads 122 is 10 degrees to 40 degrees. In step S10, the area of the predetermined yarn removal pattern region a is 2 to 20 times, more preferably 2 to 4 times, the area of the opening pattern 131. The etching process in steps S7 and S10 may be dry etching such as laser etching or wet etching such as acid-base etching.

In another embodiment, the web 12 may also be a composite web as shown in fig. 6, and correspondingly, the step S1 further includes the following steps:

step S11: interweaving a plurality of parallel Teddosaur warp threads and a plurality of parallel Teddosaur weft threads to form a Teddosaur mesh cloth 124, and interweaving a plurality of parallel metal warp threads and a plurality of parallel metal weft threads to form a metal mesh cloth 125;

step S12: opening an opening on the teflon mesh cloth 124, covering the metal mesh cloth 125 at the opening, and pressing the metal mesh cloth 125 and the teflon mesh cloth 124 to form a composite mesh cloth. In the subsequent process steps, the predetermined yarn-removing pattern area a, the emulsion layer 14 and the polymer material layer 13 are all disposed on the metal mesh cloth 125.

According to the utility model, the warp and weft at the net knot position on the mesh cloth are etched and refined, so that the relative rotation between the warp and the weft is facilitated, the rotation angle is generated, and the printing screen plate with the inclined screen is generated. The opening pattern can also be formed on the printing screen of the inclined screen, and the rotation angle can be adjusted according to the actual requirement. According to the printing screen plate, only the warps or the wefts are included in the opening patterns, and the warps or the wefts in the opening patterns are in the state of the inclined screen, so that the resistance to printing ink is small in the printing process, the printed patterns are accurate, the height fluctuation is small, the impedance is low, the power generation efficiency is high, and the printing screen plate can be suitable for opening patterns of various shapes by adjusting the rotation angle between the warps and the wefts. Furthermore, the printing screen of the present application can be applied to a fine line diameter screen, for example, a line diameter of 9-16 μm, to match finer pattern production. Therefore, the technical scheme of the application is suitable for the industry of the printing screen.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. The printing screen is characterized by comprising a screen frame (11) and screen cloth (12) fixed on the screen frame (11), wherein the screen cloth (12) comprises a plurality of parallel warps (121) and a plurality of parallel wefts (122), the warps (121) and the wefts (122) are interwoven to form a plurality of network knots (123), the network knots (123) are formed in a way that the diameters of the warps (121) are thinned and reduced, the diameters of the wefts (122) are thinned and reduced, the warps (121) and the wefts (122) are not perpendicular to each other, at least one preset yarn removing pattern area is arranged on the screen cloth (12), the preset yarn removing pattern area only comprises the warps (121) or the wefts (122), a high polymer material layer (13) covers the screen cloth (12), at least one opening pattern (131) is arranged in an area, corresponding to the preset yarn removing pattern area, on the high polymer material layer (13), the opening pattern (131) includes only warp threads (121) or weft threads (122) in a predetermined cut pattern region.

2. The printing screen according to claim 1, wherein at the network node, the diameter of the warp threads (121) is reduced to 51% -99% of the original diameter, and the diameter of the weft threads (122) is reduced to 51% -99% of the original diameter.

3. The printing screen according to claim 1, wherein the original diameter of the warp threads (121) is d1, the diameter of the thinned warp threads (121) at the corresponding grid junctions (123) is d1 ', the original diameter of the weft threads (122) is d2, the diameter of the thinned weft threads (122) at the corresponding grid junctions (123) is d 2', and the included angle θ between the warp threads (121) and the weft threads (122) is 90+ arctan { ((d1-d1 '+ d2-d 2')/2)/d 1 '} degree or 90-arctan { ((d1-d 1' + d2-d2 ')/2)/d 1' }.

4. The printing screen according to claim 1, wherein the mesh (12) comprises a Teflon mesh (124) and a metal mesh (125), the Teflon mesh (124) is fixedly connected with the screen frame (11), an opening is formed in the Teflon mesh (124), the metal mesh (125) is fixedly connected with the Teflon mesh (124), the metal mesh (125) covers the opening in the Teflon mesh (124), and the polymer material layer (13) and the predetermined yarn removing pattern area are both disposed on the metal mesh (125).

5. A printing screen according to claim 1, wherein the predetermined de-screening pattern area has an area 2 to 20 times the area of the pattern of openings (131).

6. A printing screen according to claim 1, wherein the predetermined de-screening pattern area has an area 2-4 times the area of the pattern of openings (131).

7. The printing screen according to claim 1, wherein the diameter of the warp threads (121) and the diameter of the weft threads (122) are respectively 9 μm to 16 μm;

the included angle theta between the warp (121) and the weft (122) is 100-130 degrees.

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