CN113561637A - Material-holding printing screen - Google Patents
Material-holding printing screen Download PDFInfo
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- CN113561637A CN113561637A CN202110998771.4A CN202110998771A CN113561637A CN 113561637 A CN113561637 A CN 113561637A CN 202110998771 A CN202110998771 A CN 202110998771A CN 113561637 A CN113561637 A CN 113561637A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/34—Screens, Frames; Holders therefor
- B41F15/36—Screens, Frames; Holders therefor flat
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- Photosensitive Polymer And Photoresist Processing (AREA)
Abstract
The invention discloses a material containing printing screen, which comprises a screen frame and a screen cloth, wherein the screen cloth is stretched on the screen frame through a tension screen, the screen cloth is formed by weaving a plurality of metal weft threads and metal warp threads in a mutually staggered manner, the printing side of the screen cloth is wrapped with a material containing layer, and a printing plate layer is adhered on the material containing layer; the printing plate layer is provided with a plurality of printing plate wire slots, the printing plate wire slots form printing patterns, the material containing layer is provided with a material containing wire cavity, and the material containing wire slots correspond to the printing plate wire slots; the width b of the cavity opening of the material containing line cavity is larger than the width a of the notch of the printing plate line groove. The material-containing printing screen can get rid of the restriction of screen cloth on printing precision, realize high-precision printing, and is particularly suitable for high-precision printing.
Description
Technical Field
The invention relates to a printing screen, in particular to a printing screen with a material (ink) containing cavity structure arranged on the pasting and printing side of screen cloth.
Background
With the continuous improvement of the photoelectric conversion efficiency of the solar cell, the circuit pattern design and the specification of the printed circuit board on the solar cell panel are more and more precise, so that the shielding loss and the ohmic loss of the cell circuit are reduced to the maximum extent. While the fine and precise cell printing lines largely depend on the printing screen used to print the circuit pattern of the solar cell.
The prior printing screen mainly comprises a plate base mesh cloth for providing printing resilience tension and supporting a printing film, and a printing plate layer coated on the mesh cloth and used for printing circuit patterns; the screen cloth of the printing screen is the screen cloth woven by metal wires, the printing plate layer mainly comprises a photosensitive emulsion layer which adopts photosensitive emulsion to form printing patterns, and a non-photosensitive printing plate layer which coats a high polymer material film on the screen cloth and etches the printing patterns on the high polymer material film by laser etching equipment. The photosensitive emulsion is used as a printing plate layer, the plate making process is complex, the requirements on the environment are relatively strict, the yield is not high, especially the printing precision is influenced by the exposure degree, the printing resisting times of the screen printing plate can be reduced due to insufficient exposure, and the definition of a printed pattern can be influenced due to excessive exposure; although the printing plate layer made of the non-photosensitive high polymer material can overcome the defects of photosensitive latex, the printing plate layer has the advantages of simple process, excellent wear resistance and long service life, but the printing precision and the ink penetration amount of the printing plate layer are still limited by the structure of the screen cloth, so that the performance is difficult to break through, the finer the line diameter of the screen cloth is, the better the ink penetration of the screen cloth is, the smaller the light shielding of a printed circuit is, the finer the line diameter of the screen cloth is, the more complicated the weaving process is, and the higher the strength requirement on the woven wire is, so that the cost price of the screen cloth is greatly increased without limit, especially the mesh number of the screen cloth in an actual screen plate product cannot be increased without limit, and the diameter of the woven wire cannot be reduced. Therefore, no matter the structure of the screen cloth and the photosensitive emulsion printing plate layer or the structure of the screen cloth and the high polymer material printing plate layer is adopted, the fineness and the precision of a printing line and the ink penetration rate are all limited by the mesh number and the mesh wire diameter of the screen mesh.
In order to increase the energy conversion efficiency of the solar cell, the printed electrode of the solar cell circuit is required to be thin and high, that is, the width of the printed electrode becomes thinner and thinner, and the larger the aspect ratio of the printed electrode, the higher the energy conversion efficiency. However, in the existing screen cloth + printing plate layer double-layer screen structure, the slurry (ink) for printing corresponding patterns is actually contained in the mesh or the mesh groove attached to the screen cloth, the screen cloth has the dual functions of supporting a printing film and containing the slurry, the cross joint part of the warp and the weft of the screen cloth is easy to block the permeation of the slurry (ink) to a printing substrate to form irregular printing electrodes, even broken lines can be caused, even if the non-joint screen cloth is adopted, the problem that the screen line blocks the permeation of the slurry (ink) still exists, and the phenomena of broken lines and virtual printing are difficult to avoid; this obviously limits the improvement of the fine accuracy of the printed circuit. And when the screen cloth rebounds, the paste adhesive force exists between the screen wire of the corresponding part of the screen cloth printing wire groove and the printing substrate, the printing electrode cannot completely duplicate the shape of the printing wire groove due to the rebounding drag of the random adhesive force to the printing paste, the boundary of the printing electrode is irregular, the line width and the line height of each section of the electrode cannot be accurately consistent, the shielding loss and the ohmic loss of the solar cell piece are increased, the solar energy conversion efficiency is reduced, and the adverse effect that the width of the printing electrode is thinner is more obvious. How to get rid of the restriction of the screen cloth on the precision of the printed circuit and make the photoelectric conversion efficiency break through becomes a technical problem which is eagerly solved in the industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a material-containing printing screen plate which can get rid of the restriction of screen cloth on printing precision and realize high-precision printing.
In order to solve the technical problem, the invention provides a material containing printing screen, which comprises a screen frame and screen cloth, wherein the screen cloth is stretched on the screen frame through a tension screen, the screen cloth is formed by weaving a plurality of metal weft threads and metal warp threads in a mutually staggered manner, the printing side of the screen cloth is wrapped with a material containing layer, and a printing plate layer is adhered on the material containing layer; the printing plate layer is provided with a plurality of printing plate wire slots, the printing plate wire slots form printing patterns, the material containing layer is provided with a material containing line cavity, and the material containing line cavity corresponds to the printing plate wire slots; the width b of the cavity opening of the material containing line cavity is larger than the width a of the notch of the printing plate line groove.
Preferably, the scraping side of the screen cloth is wrapped with a scraping layer, and a scraping line groove is formed in the scraping layer and corresponds to the material accommodating line groove.
Preferably, the slot width c of the scratch slot is greater than the slot width a of the plate slot.
Preferably, the scraping layer is a polymer material layer or a photosensitive emulsion layer.
Preferably, the material containing layer is a polymer material layer, a photosensitive emulsion layer or a metal sheet layer.
Preferably, the printing plate layer is a polymer material layer or a photosensitive emulsion layer or a metal sheet layer.
Preferably, the material containing layer (3) is a polyimide composite material layer, and the composite material comprises the following components in parts by mass: 50-70 parts of polyimide, 5-8 parts of silane coupling agent and 30-40 parts of polysilazane-polysiloxane copolymer.
Preferably, the polyimide composite layer is prepared according to the following steps:
1) dissolving aromatic diamine in a polar organic solvent, adding aromatic dianhydride, and reacting for 5-7h to obtain polyamic acid resin dispersion liquid;
and 2) sequentially adding a silane coupling agent and a polysilazane-polysiloxane copolymer into the polyamic acid resin dispersion liquid obtained in the step 1), uniformly stirring and dispersing at a high speed, defoaming, casting to form a film, and performing biaxial tension and high-temperature imidization to obtain the film-shaped polyimide composite material.
Preferably, the aromatic diamine is 4, 4 '-diaminodiphenyl ether, 3, 4' -diaminodiphenyl ether, p-phenylenediamine, m-phenylenediamine or biphenyldiamine.
Preferably, the aromatic dianhydride is pyromellitic dianhydride, 3, 3 ', 4, 4' -biphenyltetracarboxylic dianhydride, 3, 3 ', 4, 4' -diphenylmethylether tetracarboxylic dianhydride or 3, 3 ', 4, 4' -benzophenonetetracarboxylic dianhydride.
After the technical scheme is adopted, the invention at least has the following beneficial effects:
(1) in the structure, because the three-layer structure including screen cloth, the material containing layer and the printing plate layer on the printing screen is added between the screen cloth and the printing plate layer, the material containing layer of the screen cloth is transferred to the material containing layer by the material containing function of the screen cloth, so that the screen cloth only plays the role of supporting and tensioning, and the printing precision and the material (ink) penetrating performance of the screen cloth are not interfered and restricted by the screen cloth structure any more.
(2) Furthermore, the material containing line cavity arranged on the material containing layer corresponds to the position of the printing plate wire slot on the printing plate layer, and the material containing line cavity directly provides uniform and continuous printing slurry for the printing plate wire slot, so that the problem of permeation blocking of the printing slurry is completely avoided, and virtual printing or printing wire breakage is not generated, so that the superfine printing of the printing line electrode can be realized, the shading area of the printing electrode can be reduced to the maximum extent, and the shading loss can be reduced; the material containing line cavity in the structure is directly connected with the printing plate line slot without barriers, so that the continuity of feeding in the printing process is ensured, the regularity of the electrode boundary of a printing line and the equal height of the electrode section are ensured, and the ohmic loss is favorably reduced; this structure has guaranteed the improvement of photoelectric conversion efficiency through guaranteeing the high precision of printed wiring.
(3) And the width b of the cavity opening of the material containing cavity is greater than the width a of the notch of the printing plate slot, so that the slurry in the material containing cavity can be printed on a printing substrate through the printing plate slot with a certain printing extrusion force by the scraper during scraping, the slurry has strong adhesive force, the thickness of the slurry is convenient to control, the regularity and continuity of printed circuit electrodes are ensured, and the realization of high-precision printing is facilitated.
(4) Finally, this application has improved common polyimide macromolecular material to holding the bed of material, owing to add silane coupling agent, polysilazane-polysiloxane copolymer, has reduced the surface tension who holds material line chamber lateral wall, helps printing in-process silver thick liquid to get into the printing plate wire casing fast on the one hand, further improves the continuity of feed, and on the other hand, thereby it leads to the resilience of printing thick liquids to drag the negative effect to the printing electrode precision that produces to have reduced the adhesive force that stagnates of holding material line chamber. In addition, the silane coupling agent and the polysilazane in the application are beneficial to improving the adhesion of the material-containing film layer, the printing plate layer and the screen cloth, so that the service life of the screen printing plate is greatly prolonged.
Drawings
The material containing printing screen of the present invention will be further described with reference to the accompanying drawings and the following detailed description.
Fig. 1 is a schematic top view of a material-containing printing screen according to an embodiment of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;
FIG. 3 is an enlarged partial schematic view of a portion I of FIG. 2;
fig. 4 is a partially enlarged schematic view of another embodiment of section i in fig. 2.
In the figure, 1-screen frame, 2-screen cloth, 21-metal weft, 22-metal warp, 3-material containing layer, 4-printing plate layer, 5-stretching screen mesh, 6-material containing line cavity, 7-printing plate wire groove, 8-scraping layer, 9-scraping wire groove, G-scraping side and T-sticking side.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work, based on the embodiments of the present invention, belong to the scope of the present invention.
Example 1 solar screen
The material-containing printing screen shown in fig. 1 comprises a screen frame 1, wherein the screen frame 1 is made of aluminum alloy material, a window for stretching a screen cloth 2 is arranged at the center of the screen frame 1, and the screen cloth 2 is bonded on the bottom side surface stretched on the screen frame 1 through an adhesive.
As shown in fig. 2, the mesh cloth 2 positioned in the central window of the screen frame 1 is stretched and stretched on the bottom surface of the screen frame 1 through the stretching wire mesh 5 at the periphery thereof; the mesh cloth 2 is formed by interweaving metal weft threads 21 and metal warp threads 22, and the metal weft threads 21 and the metal warp threads 22 are stainless steel wires. The periphery of the screen cloth 2 is mutually lapped with the inner edge of the window of the tension screen net 5, and the tension screen net 5 is a polyester screen net shaped like a Chinese character 'hui'. The upper side of the mesh cloth 2 is a scraping side G, the lower side of the mesh cloth 2 is a sticking side T, a scraper is positioned in the space of the scraping side G during scraping, and printing base materials such as silicon wafers are positioned on the scraping side T.
As shown in fig. 3, a material containing layer 3 is coated on the surface of the screen cloth 2 on the printing side T (lower side), the material containing layer 3 is a polymer material layer, and the polymer material is one of PET, PE, PI, PU, PVC, PP, PA, ABS, PMMA and POM. A printing plate layer 4 is adhered on the material containing layer 3, and the printing plate layer 4 is a metal sheet. The printing plate layer 4 is provided with a plurality of printing plate wire slots 7, the printing plate wire slots 7 form printing patterns to be printed, the material containing layer 3 is provided with a plurality of material containing line cavities 6, the material containing line cavities 6 correspond to the printing plate wire slots 7, namely, the cross section symmetrical lines of the material containing line cavities 6 and the printing plate wire slots 7 are on the same straight line. The width b of the orifice of the stock receiving chamber 6 is greater than the width a of the slot opening of the plate chase 7. The sections of the material containing line cavity 6 and the printing plate line groove 7 can be rectangular through grooves or conical through grooves. The material containing layer 3 can also be a photosensitive emulsion layer, and the printing plate layer 4 is a high polymer material layer. Or the material containing layer 3 is a photosensitive emulsion layer, and the printing plate layer 4 is a metal sheet.
As shown in fig. 4, the mesh fabric 2 is formed by weaving the metal weft 21 and the metal warp 22 in a staggered manner, and the metal weft 21 and the metal warp 22 are both stainless steel wires. The scraping side G of the screen cloth 2 is coated with a scraping layer 8, and the scraping layer 8 is a photosensitive emulsion layer or a high polymer material layer. The scraping layer 8 is provided with a scraping line groove 9, the scraping line groove 9 corresponds to the material containing line cavity 6, and the width C of the notch of the scraping line groove 9 is larger than the width a of the notch of the printing plate line groove 7, so that the width C of the notch of the scraping line groove 9 is equal to or larger than the width b of the cavity opening of the material containing line cavity 6. The surface of the sticking side T (lower side) of the mesh cloth 2 is coated with a material containing layer 3, the material containing layer 3 is a high polymer material layer, and the high polymer material is one of PET, PE, PI, PU, PVC, PP, PA, ABS, PMMA or POM. A printing plate layer 4 is adhered on the material containing layer 3, and the printing plate layer 4 is a metal sheet. The printing plate layer 4 is provided with a plurality of printing plate wire slots 7, the printing plate wire slots 7 form printing patterns to be printed, the material containing layer 3 is provided with a plurality of material containing line cavities 6, the material containing line cavities 6 correspond to the printing plate wire slots 7, namely, the cross section symmetrical lines of the material containing line cavities 6 and the printing plate wire slots 7 are on the same straight line. The width b of the orifice of the stock receiving chamber 6 is greater than the width a of the slot opening of the plate chase 7. The sections of the material containing line cavity 6 and the printing plate line groove 7 can be rectangular through grooves or conical through grooves. Similarly, the material containing layer 3 can also be a photosensitive emulsion layer, and the printing plate layer 4 can be a polymer material layer. Or the material containing layer 3 is a photosensitive emulsion layer, and the printing plate layer 4 is a metal sheet.
EXAMPLE 2 preparation of polyimide composite Material for Material holding layer
The composite material comprises the following components in parts by mass: 60 parts of polyimide, 6 parts of a silane coupling agent and 35 parts of polysilazane-polysiloxane copolymer. The polyimide composite material layer is prepared according to the following steps: 1) Dissolving aromatic diamine in a polar organic solvent, adding aromatic dianhydride, and reacting for 5-7h to obtain polyamic acid resin dispersion liquid; and 2) sequentially adding a silane coupling agent and a polysilazane-polysiloxane copolymer into the polyamic acid resin dispersion liquid obtained in the step 1), uniformly stirring and dispersing at a high speed, defoaming, casting to form a film, and performing biaxial tension and high-temperature imidization to obtain the film-shaped polyimide composite material. Aromatic diamine p-phenylenediamine and aromatic dianhydride are pyromellitic dianhydride.
Third, preparation of halftone products A-C and proportional halftone product D
A screen product a prepared according to the screen structure of example 1, with the cross-sectional symmetry lines of the material-holding line cavity 6 and the plate line slot 7 being in the same straight line. The width b of the orifice of the stock receiving chamber 6 is greater than the width a of the slot opening of the plate chase 7. The sections of the material containing line cavity 6 and the printing plate line groove 7 are rectangular through grooves. The scraping line groove 9 corresponds to the material containing line cavity 6, the width C of the notch of the scraping line groove 9 is larger than the width a of the notch of the printing plate line groove 7, and the width C of the notch of the scraping line groove 9 is equal to or larger than the width b of the cavity opening of the material containing line cavity 6. The material containing layer 3 is a photosensitive emulsion layer, and the printing plate layer 4 is a polyimide layer.
And a screen product B prepared according to the screen structure of embodiment 1, wherein the cross-sectional symmetry lines of the material accommodating line cavity 6 and the plate line slot 7 are in the same straight line. The width b of the orifice of the stock receiving chamber 6 is greater than the width a of the slot opening of the plate chase 7. The sections of the material containing line cavity 6 and the printing plate line groove 7 are rectangular through grooves. The scraping line groove 9 corresponds to the material containing line cavity 6, the width C of the notch of the scraping line groove 9 is larger than the width a of the notch of the printing plate line groove 7, and the width C of the notch of the scraping line groove 9 is equal to or larger than the width b of the cavity opening of the material containing line cavity 6. The material accommodating layer 3 is a polyimide layer, and the printing plate layer 4 is a polyimide layer.
And a screen product C prepared according to the screen structure of embodiment 1, wherein the cross-sectional symmetry lines of the material accommodating line cavity 6 and the plate line slot 7 are in the same straight line. The width b of the orifice of the stock receiving chamber 6 is greater than the width a of the slot opening of the plate chase 7. The sections of the material containing line cavity 6 and the printing plate line groove 7 are rectangular through grooves. The scraping line groove 9 corresponds to the material containing line cavity 6, the width C of the notch of the scraping line groove 9 is larger than the width a of the notch of the printing plate line groove 7, and the width C of the notch of the scraping line groove 9 is equal to or larger than the width b of the cavity opening of the material containing line cavity 6. The material-holding layer 3 was the polyimide composite material prepared in example 2, and the printing plate layer 4 was a polyimide layer.
Comparative example screen product D
Compared with the screen product A, the comparative screen product D has no material containing layer, and the other structures are the same.
Evaluation of Performance
And (4) counting the yield, wherein the non-good products refer to the phenomena of obvious line breakage, false printing, irregular electrode boundary and the like of the printed finished products.
Specifically, it is shown in Table 1
| Screen printing plate A | Screen B | Screen printing plate C | Screen printing plate D | |
| Yield of good products | 97.5% | 97.8% | 98.9% | 94.5% |
Therefore, the yield of the solar screen printing plate with the added material containing capacity is greatly improved compared with the prior art.
Claims (10)
1. The utility model provides a hold material printing half tone, includes screen frame (1) and screen cloth (2), screen cloth (2) are strutted through stretch-draw silk screen (5) and are located on screen frame (1), and this screen cloth (2) are woven by a plurality of metal weft (21) and metal warp (22) each other crisscross and are formed its characterized in that: the sticking side (T) of the screen cloth (2) is coated with a material containing layer (3), and a printing plate layer (4) is stuck on the material containing layer (3); a plurality of printing plate wire grooves (7) are formed in the printing plate layer (4), the printing plate wire grooves (7) form printing patterns, a material containing wire cavity (6) is formed in the material containing layer (3), and the material containing wire cavity (6) corresponds to the printing plate wire grooves (7); the width b of the cavity opening of the material containing line cavity (6) is larger than the width a of the notch of the printing plate line groove (7).
2. The material-holding printing screen according to claim 1, wherein: the scraping side (G) of the screen cloth (2) is coated with a scraping layer (8), a scraping line groove (9) is arranged on the scraping layer (8), and the scraping line groove (9) corresponds to the material accommodating line cavity (6).
3. The material-holding printing screen according to claim 2, wherein: the width c of the groove opening of the scraping line groove (9) is larger than the width a of the groove opening of the printing plate line groove (7).
4. The material-holding printing screen according to claim 2, wherein: the scraping and printing layer (8) is a high polymer material layer or a photosensitive emulsion layer.
5. The material-holding printing screen according to any one of claims 1 to 4, wherein: the material containing layer (3) is a high polymer material layer or a photosensitive emulsion layer or a metal sheet layer.
6. The material-holding printing screen according to any one of claims 1 to 4, wherein: the printing plate layer (4) is a high polymer material layer or a photosensitive emulsion layer or a metal sheet layer.
7. The material-holding printing screen according to any one of claims 1 to 4, wherein: the material containing layer (3) is a polyimide composite material layer, and the composite material comprises the following components in parts by mass: 50-70 parts of polyimide, 5-8 parts of silane coupling agent and 30-40 parts of polysilazane-polysiloxane copolymer.
8. The material-holding printing screen of claim 7, wherein: the polyimide composite material layer is prepared according to the following steps:
1) dissolving aromatic diamine in a polar organic solvent, adding aromatic dianhydride, and reacting for 5-7h to obtain polyamic acid resin dispersion liquid;
and 2) sequentially adding a silane coupling agent and a polysilazane-polysiloxane copolymer into the polyamic acid resin dispersion liquid obtained in the step 1), uniformly stirring and dispersing at a high speed, defoaming, casting to form a film, and performing biaxial tension and high-temperature imidization to obtain the film-shaped polyimide composite material.
9. The material-holding printing screen of claim 8, wherein: the aromatic diamine is 4, 4 '-diaminodiphenyl ether, 3, 4' -diaminodiphenyl ether, p-phenylenediamine, m-phenylenediamine or biphenyldiamine.
10. The material-holding printing screen of claim 8, wherein: the aromatic dianhydride is pyromellitic dianhydride, 3, 3 ', 4, 4' -biphenyl tetracarboxylic dianhydride, 3, 3 ', 4, 4' -diphenyl methyl ether tetracarboxylic dianhydride or 3, 3 ', 4, 4' -benzophenone tetracarboxylic dianhydride.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021100596645 | 2021-01-18 | ||
| CN202110059664 | 2021-01-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113561637A true CN113561637A (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110998771.4A Pending CN113561637A (en) | 2021-01-18 | 2021-08-28 | Material-holding printing screen |
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| CN (1) | CN113561637A (en) |
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Application publication date: 20211029 |