CN212219601U

CN212219601U - High-precision printing screen

Info

Publication number: CN212219601U
Application number: CN202020264971.8U
Authority: CN
Inventors: 卫巍
Original assignee: Suzhou Oriental Jiali Precision Technology Co ltd
Current assignee: Suzhou Oriental Jiali Precision Technology Co ltd
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-12-25
Anticipated expiration: 2030-03-06

Abstract

The utility model discloses a high accuracy printing half tone relates to printing half tone technical field. The metal mesh cloth wrapping device comprises a mesh frame, metal mesh cloth and a wrapping layer wrapping the metal mesh cloth, wherein the wrapping layer is provided with a plurality of openings; when the opening is parallel to the metal warp or the metal weft, two adjacent warps or two adjacent wefts are removed at intervals to form a plurality of wireless areas, and an opening is arranged at the center of each wireless area; the metal mesh cloth is characterized by further comprising a sheet, wherein the sheet is arranged on one side of the printing face of the metal mesh cloth and is fixedly connected to the metal mesh cloth, and a sheet opening is formed in the position, right opposite to the opening, of the sheet. The utility model removes two adjacent warps or wefts at intervals, and no node where the warps and wefts intersect is formed at the opening, so that the ink can not be obstructed and is uniformly discharged; the laser welding device is provided with the sheet and the sheet opening, the sheet opening is formed by laser, the edge and the four walls are smooth and flat, the condition of hollow or protruding cannot occur, and the printed electrode wire has no flaws.

Description

High-precision printing screen

Technical Field

The invention relates to the technical field of printing screens, in particular to a high-precision printing screen.

Background

The screen printing technology is that a plurality of warps and a plurality of wefts are woven up and down in a staggered manner to form a mesh cloth, and then the mesh cloth is fixed on a screen frame. Then, a photosensitive resist or a polymer material layer is coated and formed on the mesh, and then a plurality of pattern openings are formed on the photosensitive resist layer or the polymer material layer by means of exposure, development or laser. Finally, the operator can utilize the scraper to press the mesh cloth to scrape and print the ink, so that the ink can print the graph on the printed object through the pattern openings.

With the development of technology, the screen printing technology is applied to the field of solar cells and is used for printing finger-shaped electrodes on silicon wafers. The finger electrodes are usually one hundred and rectangular in shape, arranged in parallel, and have a width of only tens of micrometers. During printing, because the width of the pattern opening is only dozens of micrometers, the longitude and latitude lines at the pattern opening are extremely large, ink discharging is affected, and particularly silver paste is difficult to leak at nodes where the longitude and latitude lines intersect, dead spots are formed, the electrode function is affected, and further the efficiency of the battery is affected.

In order to solve this problem, some people propose to remove the warp and/or weft at the pattern opening by laser fusing or etching, so as to effectively reduce the ink blocking and increase the ink amount.

Chinese utility model "composite material half tone" with publication number CN208469286U provides a composite material half tone, include: a screen frame; the screen cloth is stretched and fixed on the screen frame and comprises a plurality of metal warp threads and a plurality of metal weft threads which are staggered up and down; a macromolecular material layer, cladding screen cloth, and macromolecular material layer includes a plurality of opening patterns, wherein, does not have many metal warp or do not have many metal weft in a plurality of opening patterns, does not have many metal warp in a plurality of opening patterns when, has a first contained angle between a plurality of opening patterns and many metal weft, and does not have many metal weft in a plurality of opening patterns when, has a second contained angle between a plurality of opening patterns and many metal warp.

The utility model discloses remove the warp or the weft of opening pattern department with the mode of laser or etching, opening pattern department just does not have crisscross node like this, has increased the printing ink penetration rate. However, in practical production processes, the number of finger electrodes is as high as one hundred or more, which is very labor intensive, difficult to operate and costly.

If the opening pattern is arranged between two adjacent warps or wefts and is parallel to the warps or wefts, the opening pattern does not have staggered nodes of the warps and wefts, and the ink permeability can be improved.

Chinese invention with publication number CN108297533B, "screen structure for screen printing finger electrodes of solar cells and method for making the same" provides a screen structure for screen printing finger electrodes of solar cells, comprising: the mesh cloth is composed of a plurality of warps and a plurality of wefts, wherein each warp is parallel to each other, and each weft is connected with each warp; an emulsion layer coated and formed on the mesh cloth; and a plurality of finger-like electrode pattern openings formed on the emulsion layer, each of the finger-like electrode pattern openings being disposed in an interval formed by any two adjacent warps; each of the plurality of wefts is provided with a first end point and a second end point, each of the plurality of wefts is connected with at least two warps of the plurality of warps through the first end point and the second end point, and an included angle formed by each of the plurality of wefts and each of the plurality of warps is a non-right angle; furthermore, the invention also provides a manufacturing method of the screen printing plate structure for the finger-shaped electrode of the screen printing solar cell.

According to the invention, the pattern opening is arranged between two adjacent warps, so that the ink penetration rate is improved. However, in the actual production process, since the pattern opening, the warp and the distance between the two warps are in the micron order, it is difficult to make the pattern opening completely parallel to the two warps, the pattern opening may intersect with the warp by a slight deviation, and at this time, the warp at the pattern opening still causes the ink penetration rate to decrease, the printing effect becomes poor, and further the electrode conversion efficiency is reduced.

Except that above-mentioned two patents are difficult for realizing, in actual production process, the printed electrode still can appear penetrating black volume inhomogeneous, deckle edge scheduling problem. The reason is that the pattern opening is usually obtained by exposure and development or laser, and on the micron-sized dimension, the lower edge and the side wall of the pattern opening can have some hollow or convex places, so that the edge of the printed electrode is uneven, burrs occur, the shape is not beautiful, and the performance is also influenced. And although some warps or wefts are reduced at the openings of the patterns, some warps or wefts are still kept to ensure the strength of the screen printing plate, and the still existing warps or wefts prevent some ink from being discharged when the screen printing plate is printed regardless of the angle, so that grooves are formed on the upper surface of the electrode, and the performance of the electrode is influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a high accuracy printing half tone that can superfine lines of high accuracy printing.

In order to solve the above problem, the technical scheme of the utility model is that:

the utility model provides a high accuracy printing half tone, includes screen frame and metal screen cloth, metal screen cloth is tensile through a predetermined tension and is fixed in on the screen frame, metal screen cloth includes many metal warp and many metal weft of staggered arrangement from top to bottom, metal screen cloth includes that one scrapes knife face and a seal face, still includes the parcel layer, the cladding of parcel layer metal screen cloth, the parcel layer includes the opening that a plurality of is parallel to each other, the opening is the rectangular bodily form of rectangular shape, open-ended width is less than two adjacent metal warp width of triple or two adjacent metal weft width of triple.

The openings are arranged in parallel to the metal warp threads or the metal weft threads;

when the opening is parallel to the metal warp threads, two adjacent metal warp threads are removed at intervals to form a plurality of wireless areas, and the center of each wireless area is provided with one opening;

when the opening is parallel to the metal weft, two adjacent metal wefts are removed at intervals to form a plurality of wireless areas, and the center of each wireless area is provided with one opening;

the metal mesh cloth is characterized by further comprising a sheet, the shape of the sheet is consistent with that of the metal mesh cloth, the area of the sheet is equal to or slightly smaller than that of the metal mesh cloth, the sheet is arranged on one side of the printing surface of the metal mesh cloth and fixedly connected to the metal mesh cloth, a sheet opening with the cross section being consistent with that of the opening in shape and size is arranged at the position, right opposite to the opening, of the sheet, and the sheet opening is rectangular.

Further, still include the adhesive linkage, the adhesive linkage set up in between thin slice and the metal mesh cloth, the adhesive linkage is just being provided with the adhesive linkage opening in the position of opening.

Further, the bonding layer opening is in a rectangular parallelepiped shape or a trapezoidal shape, when the bonding layer opening is in a rectangular parallelepiped shape, the size of the cross section of the bonding layer opening is the same as the size of the cross section of the opening, when the bonding layer opening is in a trapezoidal shape, the size of the lower surface of the bonding layer opening is the same as the size of the cross section of the opening, the size of the upper surface of the bonding layer opening is larger than the size of the cross section of the opening, and the upper surface of the bonding layer opening covers the lower surface of the opening.

Further, the length of the removed metal warp or weft is slightly greater than the length of the opening.

Further, the sheet is a metal sheet or a plastic sheet.

Further, the plastic sheet is a transparent plastic sheet.

Furthermore, the thickness of the thin slice is 1-200 μm, and the number of the openings is 1-200.

Further, the wrapping layer is a high polymer material layer or a photosensitive adhesive layer.

Further, the material of the polymer material layer is one of or a composite material of PET, PE, PI, PU, PVC, PP, PTFE, PMMA, PS, PA, PC, PF, PAI, PAN, ABS, Epoxy, and Silicone.

Further, the polyester screen cloth comprises a polyester screen cloth and a hot melt adhesive layer, wherein the center of the polyester screen cloth is hollow, the polyester screen cloth is coated by the hot melt adhesive layer, the polyester screen cloth is stretched and fixed on the net frame through a preset tension, and the metal screen cloth is fixed at the center of the polyester screen cloth through the hot melt adhesive layer.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses two adjacent warp or weft are got rid of to the spaced, set up the opening in wireless regional center department. Nodes with crossed warps and wefts cannot be formed at the opening, so that ink discharging cannot be hindered, ink discharging is uniform, and the printed electrode wire cannot have flaws;

2. the utility model discloses be provided with the thin slice, the thin slice sets up in paste seal face one side, the thin slice is provided with the thin slice opening, the thin slice is sheetmetal or plastic sheet, the thickness of thin slice is 1 mu m-200 mu m, the thin slice opening is radium-shine by laser usually, edge and four walls are smooth and level, the condition of pit hole depression or protrusion can not appear, silver thick liquid from the opening infiltration back, form perfect cuboid bodily form at the thin slice opening, also be the shape of electrode line, the height of thin slice opening is adjusted according to the height of electrode line, the electrode line that finally prints does not have the flaw;

3. the plastic sheet of the utility model is a transparent plastic sheet, so that the shape, size and position of the opening or the bonding layer opening can be clearly seen when laser is performed, the laser is convenient, and no error occurs;

4. the utility model is provided with the adhesive layer which is used for bonding the thin slice, and the adhesive layer can use water glue or solvent glue, thereby being convenient for manufacturing and reducing the cost;

5. the bonding layer of the utility model is provided with a trapezoidal bonding layer opening, the upper surface of the bonding layer opening is larger than the lower surface of the opening, which is helpful for the silver paste to fall down and increases the ink discharge amount;

6. the utility model is provided with 1-200 openings, namely 2-400 metal warps or metal wefts are removed, the strength of the metal screen cloth is not influenced on the whole, and the problem of plate explosion is prevented;

7. the utility model is provided with the terylene mesh cloth which is wrapped with the hot melt adhesive layer and arranged on the outer ring of the metal mesh cloth, the terylene mesh cloth has elasticity, and the hot melt adhesive layer prevents the silver paste from falling, thereby being more beneficial to printing;

8. the utility model discloses the length of the metal warp or the metal weft who gets rid of slightly is greater than open-ended length, also does not get rid of the line of whole root promptly, and two parts of the surplus of the line of whole root still remain on the metal screen cloth, play about the support, increase the intensity of metal screen cloth.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic plan view of a screen printing plate according to the present invention;

FIG. 2 is a schematic plan view of the screen plate of the present invention, in which the length of the removed warp threads is slightly greater than the length of the opening;

FIG. 3 is a schematic plan view of the screen plate with a larger opening width according to the present invention;

FIG. 4 is a schematic longitudinal cross-sectional view of the metal mesh of the present invention without forming openings;

FIG. 5 is a schematic longitudinal cross-sectional view of the metal mesh and sheet of the present invention;

FIG. 6 is a schematic longitudinal cross-sectional view of the metal mesh, adhesive layer and sheet of the present invention;

FIG. 7 is a schematic longitudinal sectional view of a metal mesh, an adhesive layer and a thin sheet with trapezoidal openings in the adhesive layer according to the present invention;

wherein, 1 is a screen frame; 2 is metal mesh cloth; 3, terylene mesh cloth; 4 is a hot melt adhesive layer; 5 is a wrapping layer; 6 is a scraper face; 7 is a seal surface; 8 is metal warp; 9 is a metal weft; 10 is an opening; 11 is a wireless area; 12 is a thin sheet; 13 is a slice opening; 14 is an adhesive layer; and 15 is an adhesive layer opening.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, the present invention is further explained by combining the following specific drawings.

Example (b):

as shown in fig. 1-7, a high-precision printing screen comprises a screen frame 1, a polyester mesh fabric 3 and a metal mesh fabric 2.

On dacron screen cloth 3 is tensile and is fixed in the frame 1 through a predetermined tension, dacron screen cloth 3 center is hollow, and dacron screen cloth 3 is by the cladding of hot melt adhesive layer 4, and metal screen cloth 2 is fixed in the center department of dacron screen cloth 3, and metal screen cloth 2 is fixed in the inward flange of dacron screen cloth 3 through hot melt adhesive layer 4 all around. Dacron screen cloth 3 has elasticity, can bounce in the printing, more helps the printing, and hot melt adhesive layer 4 guarantees can not the silver thick liquid whereabouts.

The metal mesh 2 is stretched and fixed on the mesh frame 1 or the terylene mesh 3 by a preset tension. The metal mesh cloth 2 comprises a plurality of metal warp threads 8 and a plurality of metal weft threads 9 which are staggered up and down to form an upper scraper face 6 and a lower sticking printing face 7.

The metal mesh cloth 2 is wrapped by the wrapping layer 5, the wrapping layer 5 is a high polymer material layer or a photosensitive adhesive layer, or other common materials of which the printing screen plates wrap the metal mesh cloth 2, and the high polymer material layer is made of one of PET, PE, PI, PU, PVC, PP, PTFE, PMMA, PS, PA, PC, PF, PAI, PAN, ABS, Epoxy and Silicone or composite materials thereof. The function of the wrapping 5 is to prevent the silver paste from falling and forming the opening 10.

The wrapping layer 5 is provided with a plurality of parallel openings 10, the openings 10 are rectangular, and the width of the openings 10 is less than three times that of two adjacent metal warp threads 8 or three times that of two adjacent metal weft threads 9. Less than three times the width of the wireless area 11 formed as a result of the two wires being cut off is a three times distance. The distance between the warp or weft is typically 40 microns or less, so the width of the opening 10 is typically within 120 microns, and the silicon wafer is sized for the solar electrode lines. The finer the number the more and the higher the efficiency, and therefore the 120 micron width of the opening 10 is adapted to the majority of the solar electrode lines.

The opening 10 is a rectangular parallelepiped having a long shape. The electrode line is a line having a thickness and having a rectangular parallelepiped shape at a microscopic level, and the shape of the opening 10 is identical to the shape of the electrode line.

The openings 10 are arranged parallel to the metal warp threads 8 or the metal weft threads 9, which has two advantages, firstly, it is ensured that there are no intersecting nodes of two threads by only removing a few metal warp threads 8 or weft threads, and if inclined, it is ensured that there are no intersecting nodes by removing a very large number of warp threads or weft threads. After the second removal of the warp or weft, the remaining weft or warp at the opening 10 is perpendicular to the long side of the opening 10, is shorter than the length of the field side inclined to the opening 10, and has less influence on the amount of ink.

When the openings 10 are parallel to the metal warp threads 8, two adjacent metal warp threads 8 are removed at intervals to form a plurality of wireless areas 11, and one opening 10 is arranged at the center of each wireless area 11.

When the openings 10 are parallel to the metal wefts 9, two adjacent metal wefts 9 are removed at intervals to form a plurality of wireless areas 11, and one opening 10 is arranged at the center of each wireless area 11.

The intervals may be regular intervals or irregular intervals, depending on the arrangement of the electrode wires.

Two adjacent warps or wefts are removed and an opening 10 is provided at the center of the wireless area 11. The crossing node of longitude and latitude lines can not be formed at the opening 10, so that the ink discharge can not be hindered, the ink discharge is uniform, and the printed electrode wire can not have flaws

The length of the removed metal warp threads 8 or the metal weft threads 9 is slightly larger than that of the opening 10, that is, the whole thread is not removed, and the remaining two parts of the whole thread still remain on the metal mesh cloth 2 to play a role in supporting left and right, so that the strength of the metal mesh cloth 2 is increased.

The number of the electrode wires is 1-200 usually, so the number of the openings 10 is 1-200, that is, 2-400 metal warp threads 8 or metal weft threads 9 are removed, the strength of the metal mesh cloth 2 is not influenced on the whole, and the problem of board explosion is prevented.

The screen printing plate is manufactured by removing warp or weft and then forming a wrapping layer 5.

The metal mesh cloth comprises a metal mesh cloth 2 and is characterized by further comprising a sheet 12, wherein the shape of the sheet 12 is consistent with that of the metal mesh cloth 2, the area of the sheet 12 is equal to or slightly smaller than that of the metal mesh cloth 2, the sheet 12 is arranged on one side of the printing surface 7 of the metal mesh cloth 2 and fixedly connected to the metal mesh cloth 2, a sheet opening 13 with the cross section being consistent with that of the opening 10 is formed in the position, right opposite to the opening 10, of the sheet 12, and the sheet opening 13 is in a.

The foil 12, being slightly smaller than the area of the wire mesh 2, also covers all the openings 10. The reason for this is to reduce cost or process limitations.

The sheet 12 is fixedly connected with a plurality of nodes intersected by the longitude and latitude lines of the metal mesh cloth 2 in a butt-welding or electroplating mode.

The sheet 12 is a metal sheet or a plastic sheet. The plastic sheet may be a transparent plastic sheet. The plastic sheet is made of one of PET, PE, PI, PU, PVC, PP, PTFE, PMMA, PS, PA, PC, PF, PAI, PAN, ABS, Epoxy and Silicone or a composite material thereof.

The thickness of the sheet 12 is 1 μm to 200. mu.m.

The sheet opening 13 is usually formed by laser, the edge and the four walls are smooth and flat, the condition of pothole or depression cannot occur, after silver paste permeates from the opening 10, the sheet opening 13 is in a perfect cuboid shape, namely the shape of an electrode wire, the height of the sheet opening 13 is adjusted according to the thickness of the electrode wire, and finally the printed electrode wire has no flaws.

When the sheet 12 is a transparent plastic sheet, the shape, size and position of the opening 10 or the adhesive layer opening 15 can be clearly seen during laser irradiation, so that laser irradiation is facilitated, and errors are avoided.

Further comprising an adhesive layer 14, the adhesive layer 14 being arranged between the foil 12 and the metal mesh 2, the adhesive layer 14 being provided with adhesive layer openings 15 in positions facing the openings 10.

The adhesive layer opening 15 has a rectangular parallelepiped shape or a trapezoidal shape, and when the adhesive layer opening 15 has a rectangular parallelepiped shape, the size of the cross section of the adhesive layer opening 15 is the same as the size of the cross section of the opening 10, and when the adhesive layer opening 15 has a trapezoidal shape, the size of the lower surface of the adhesive layer opening 15 is the same as the size of the cross section of the opening 10, the size of the upper surface of the adhesive layer opening 15 is larger than the size of the cross section of the opening 10, and the upper surface of the adhesive layer opening 15 covers the lower surface of the opening 10.

The adhesive layer 14 is used for adhering the sheet 12, and the adhesive layer 14 can use water glue or solvent-based glue, so that the manufacturing is convenient and the cost is reduced.

The adhesive linkage opening 15 of trapezium shape, adhesive linkage opening 15 upper surface are greater than the lower surface of opening 10, help the silver thick liquid whereabouts, increase the ink volume down.

It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a high accuracy printing half tone, includes screen frame and metal screen cloth, metal screen cloth is tensile through a predetermined tension and is fixed in on the screen frame, metal screen cloth includes many metal warp and many metal weft of staggered arrangement from top to bottom, metal screen cloth includes that one scrapes knife face and a seal face, still includes the parcel layer, the parcel layer cladding metal screen cloth, the parcel layer includes the opening that a plurality of is parallel to each other, the opening is the rectangular bodily form of rectangular shape, open-ended width is less than two adjacent metal warp width of triple or two adjacent metal weft width of triple, its characterized in that:

2. A high precision printing screen according to claim 1, characterised in that: still include the adhesive linkage, the adhesive linkage set up in the thin slice with between the metal screen cloth, the adhesive linkage just in to the open-ended position is provided with the adhesive linkage opening.

3. A high precision printing screen according to claim 2, characterised in that: the opening of the bonding layer is in a cuboid shape or a trapezoid shape, when the opening of the bonding layer is in a cuboid shape, the shape and the size of the cross section of the opening of the bonding layer are the same as those of the cross section of the opening, when the opening of the bonding layer is in a trapezoid shape, the size of the lower surface of the opening of the bonding layer is the same as that of the cross section of the opening, the size of the upper surface of the opening of the bonding layer is larger than that of the cross section of the opening, and the lower surface of the opening of the bonding layer is covered by the upper surface of the opening of the bonding layer.

4. A high precision printing screen according to claim 1, characterised in that: the length of the removed metal warp or weft is slightly longer than the length of the opening.

5. A high precision printing screen according to claim 1, characterised in that: the sheet is a metal sheet or a plastic sheet.

6. A high accuracy printing half tone of claim 5, wherein: the plastic sheet is a transparent plastic sheet.

7. A high precision printing screen according to claim 1, characterised in that: the thickness of the thin slice is 1-200 μm, and the number of the openings is 1-200.

8. A high precision printing screen according to claim 1, characterised in that: the wrapping layer is a high polymer material layer or a photosensitive adhesive layer.

9. A high precision printing screen according to claim 8, characterised in that: the material of the high polymer material layer is one of PET, PE, PI, PU, PVC, PP, PTFE, PMMA, PS, PA, PC, PF, PAI, PAN, ABS, Epoxy and Silicone or a composite material thereof.

10. A high precision printing screen according to claim 1, characterised in that: the thermal melting type polyester screen cloth is characterized by further comprising a polyester screen cloth and a thermal melting adhesive layer, wherein the center of the polyester screen cloth is hollow, the thermal melting adhesive layer coats the polyester screen cloth, the polyester screen cloth is stretched and fixed on the screen frame through a preset tension, and the metal screen cloth is fixed at the center of the polyester screen cloth through the thermal melting adhesive layer.