CN104309345A - Screen printing method - Google Patents
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- CN104309345A CN104309345A CN201410540424.7A CN201410540424A CN104309345A CN 104309345 A CN104309345 A CN 104309345A CN 201410540424 A CN201410540424 A CN 201410540424A CN 104309345 A CN104309345 A CN 104309345A
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Abstract
The invention provides a screen printing method. The screen printing method approximately comprises the following steps of proportioning, preparation, transferring of photo-sensitive adhesive to a temporary soft substrate, light exposure, development, preparation of a screen printing template, screen transferring, overhauling, trial printing, formal printing and the like, and the fine improvement is realized on the basis of the steps. By adopting the technical scheme, the screen printing method has the advantages that by adopting breakthrough improvement on the specific steps, compared with the prior art, the actual problems of unfastened photo-sensitive adhesive, filling-in, nonuniform and unfasten coloring of ink, deformation of ink patterns, bubble traces, screen traces, irregular edges, pinholes, screen blockage and the like in the actual printing process are effectively solved; the printing quality is obviously improved, and the practicality is high.
Description
Technical field
The present invention relates to print field, be specifically related to a kind of method for printing screen.
Background technology
Silk-screen printing technique has been known, as Chinese invention patent CN201210405827.1 discloses a kind of traditional indigo printing fabric physical fine resist printing new technology, described indigo printing fabric manufacture craft comprises the following steps: Ridge tracing: require to design grain pattern according to decalcomania; Grain pattern black and white original text makes: the grain pattern of design is processed into the anti-sheet of black and white original text; Mesh flower version makes: bind polyamide fibre silk screen with wooden frame print edition or square steel frame print edition, coat photoresists, carry out photosensitive in darkroom, and then part strong after photosensitive is preserved, lightproof part clear water rinses out; Flower version dyeing-resisted layer thickeies: adopt after being coated with raw lacquer or the three times dryings of alkyd varnish paint and form paint film, thickeies flower version flower pattern thickness; Physical fine resist printing slurry makes: physical fine resist printing slurry is synthesized by mass percentage by following material: activated bleaching earth 30%, Cornstarch 1%, A nation slurry 14% and water 55%; Dyeing-resisted layer scraped by stamp: the physical fine resist printing slurry print edition covering fabric of synthesis surface, scraping by slipping through the net on bafta, forming physics dyeing-resisted layer; Repeatedly dye: adopt that bluegrass is indigo-blue in the solution of PH value 9, change into dye liquor, then contaminate, be oxidized, need employing to dye for more than 12 times according to color and luster; Remove dyeing-resisted layer cleaning Final finishing finished product: dry after dyeing and scrape off dyeing-resisted layer with cutter, then in the clear water adding one thousandth hydrogen peroxide, with industry washer rolling cleaning 20 minutes, and carry out changing water cleaning for three times, then shine dry finishing.Traditional silk-screened technique is because of the mode difference of photosensitive lithographic, and generally comprise three kinds of techniques, the first is direct method, and step is roughly prepares screen printing forme, preparation photoresists, upper photoresists, exposure, development, and maintenance, prints; The second is indirect method, and step is roughly preparation photoresists and preparation, is transferred to interim soft substrate, exposure, and development, prepares screen printing forme, turn net, printing; The third be straight between method, step is roughly prepares screen printing forme, preparation photoresists, photosensitive sensitization, and pad pasting is dry, exposure, development, printing.
In actual use, all can there are photoresists loosely, scumming in aforementioned various technique, ink colorant is uneven, loosely, ink logo is out of shape, have bubble trace, wire mark, edge uneven, and pin hole, numerous thorny problems of operating personnel are perplexed in network blocking etc. for a long time.
Given this, inventor furthers investigate the problems referred to above, then has this case to produce.
Summary of the invention
The object of the present invention is to provide one effectively to avoid photoresists loosely, scumming, ink colorant is uneven, loosely, ink logo is out of shape, have bubble trace, wire mark, edge uneven, pin hole, the method for printing screen of the problems such as network blocking.
In order to achieve the above object, the present invention adopts such technical scheme:
A kind of method for printing screen, comprises the steps:
(1) when joining glue, by bisphenol-A epoxy resin, polyvinyl alcohol, melamine modified phenolic resin, repefral, acrylic glycidol ether, for sodium cellulose glycolate, N-(the chloro-4-aminomethyl phenyl of 3-)-N, trimethylolethane, Tween 20, dimethyl methyl phosphonate, anhydrous acetic acid, sodium acetate, ethanol, water, ammonium dichromate mixes according to weight ratio 85-93:24-26.5:9-12:19-22:21-26:4.5-5:3-6.5:7-8.5:4-5.5:0 .3-0.45:2.5-3.4:0.6-0.9:0.7-0.8:240-280:5-5.5, and carry out stirring 9-11 minute by non-metallic rods, should carry out with " ∞ " shape during stirring, stirring can not be pulled back and forth, wherein anhydrous acetic acid and sodium acetate, and the water of ammonium dichromate and 20-22 weight ratio respectively first preparation after together join again other batching in, aforementioned all water is the distilled water that temperature is less than 38 DEG C,
Then the photoresists prepared are placed 3-5 hour under lower than the condition of 38 DEG C, treat bubble effusion wherein, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then be placed in 35-45 DEG C of dustfree environment and dry, the dry thickness of photosensitive layer is the 6.5-9% of screen thickness, and the dry thickness of photosensitive layer is greater than the roughness Rz value of silk screen;
By taking a picture, the positive image egative film made is close on photosensitive layer, and through fluorescent lamp or dysprosium lamp exposure, lamp is apart from 50-60cm, time for exposure 6-8 minute; By the water development 1-2 minute of exposed photosensitive layer 0-35 DEG C, after pattern all presents, rinse with clear water immediately and dry;
Choose yellow plain weave polyester net, order number is 250-280 order, and the 2.5-5 of the maximum ink particle diameter of Kong Changwei of grid doubly; Use the phosphoric acid of phenol, cresols and mass fraction 35-45% according to the mixed liquor of weight ratio 2:1:1, process 5-6 minute is carried out to the ink surface of silk screen, then rinses out with clear water, repeatedly carry out 2-3 time, with clear water, screen bath is clean and dry after process; Select concentrated cleaning, the two sides of silk screen is all smeared evenly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, ensure that silk screen does not have residual foam, and avoid being touched by other objects; Successively with caustic alkali and cleaning agent, cleaning by degreasing is carried out to silk screen again, then rinse with clear water, and carry out drying; After cleaning in the environment of a free from dust dry silk screen, make uniform stream flow through silk screen surface, and the same day washes net, the same day is coated with photoresists;
Aluminium alloy or steel screen frame, clean up the one side that screen frame and silk screen bond, rub gently with fine sandpaper, make screen frame rough surface; Screen frame after cleaning before the net that stretches tight, first dries at the face precoating layer adhesive glue with mesh contacts;
Adopt craft or the net machine that stretches tight to carry out stretching tight net, tiltedly stretch tight net, and the longitude and latitude netting twine of silk screen becomes 20-35 ° of angle with screen frame; Stretch tight net time, initial tensile force is the uniform tension in order of 15-18N/cm, same set of half tone, draws in the net once every 55-65 minute later, measures half tone tension force, make tension force be 24-25N/cm, and each several part tension difference is less than or equal to 1N/cm after 11-13 hour with tensometer; Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines; After silk screen tension, silk screen and screen frame are adjacent to, and at silk screen and screen frame contact portion coat binding glue again, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applying pressure, makes more firm bonding with screen frame of silk screen; After glue drying to be bonded, unclamp the net machine tensile force that stretches tight, cut off the silk screen of surrounding outside screen frame, be then posted on the silk screen position bonding with screen frame with one side adhesive sticker paper tape; Rinse silk screen with cleaning agent and clear water again, after silk screen dries, just can be used for photoresists coating;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of above-mentioned silk screen with photoresists aspect close and firm, then carry out drying, after drying, throw off soft substrate.
(3) adopt Re-exposing method to carry out cure process to screen printing forme, the re-expose time be the 1-3 of time for exposure first time in above-mentioned steps (1) doubly; Printed patterns edge is neatly cut; Then the other defect of screen printing forme is studied for a second time courses one has flunked with hole-blocking agent; Screen printing forme, after repairing, adds in non-inking part and is coated with one deck varnish protection space of a whole page;
(4) keep workshop to clean, workshop temperature 24-26 DEG C, humidity is 21.8-24.4g/m
3; Print station is cleared up and flattens; Chemical treatment, flame treatment, electron bombardment or coupling agent pretreatment are carried out to the upper and lower surface of stock, then adopts alcohol rub to clear up to the upper and lower surface of stock, and printed in 1-8 minute;
Ink adopts uv ink, by polyester acrylate resin, aldehyde ketone resin, laurate modified epoxy acrylate resin, trihydroxy methyl propane triacrylate, isopropyl thioxanthone, three (N-nitroso-N-Phenylhydroxylamine) aluminium salt, ink emulsion resistance auxiliary agent, fumed silica, terminal carboxyl polyester, modified polyethylene wax powder, nano-calcium carbonate, water-based magnesium carbonate, tri (propylene glycol) diacrylate and trihydroxy methyl propane triacrylate carry out mix and blend according to weight ratio 43-44.5:4-5:5.5-7:18-20:4.6-4.75:0.36-0.39:0.19-0.22:1.1-1.3:0.85-0.88:0.73-0.75:3.6-3.9:4.1-4.3:0.56-0.59:2.4-2.6, and the colorant of appropriate corresponding color is added according to color demand, aforementioned various ink formulations is all in solid-state, 5 microns are less than through being ground to particle size, the fineness of ink is less than 10 microns, with appropriate more than 80 DEG C hot water and aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, mix and blend 20-40 minute is carried out to ink, make the fluidity of ink be 30-50mm, the viscosity of ink is 4000-12000 centipoise, ink before use with filter screen filtration at least one times, the phenolic resins that described ink emulsion resistance auxiliary agent is is the phenolic resins of 50000-150000 by weight average molecular weight, weight average molecular weight is 1500-4000, linseed oil, organo-aluminium gel, lauric fatty acid isobutyl ester carry out mix and blend according to weight ratio 22-25:4-7:34-38:1.5-3.5:28-33 and make,
Scraper adopts polyurethane rubber or Viton material, and hardness is HS80-90, and cutting edge pressure is at 10-15N/cm
2, the speed of travel of scraper is at 200-250mm/s, and scraper and silk screen angulation are 45-75 °, keep scraper to contact with web lines in printing process, this line and the scraper direction of motion perpendicular;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as stock, through several examination printings, the dust on removing screen printing forme and foreign matter, avoid pin-hole phenomena;
(6) formally print, along with the wearing and tearing of scraper cutting edge, blade shape is circular arc, sharply increase the component of slurry towards silk screen direction, the pressure that silk screen acts on silk screen unit are obviously reduces, and the actual angle of scraper cutting edge place and silk screen is much smaller than 45 °, after printing, silk screen surface has leftover slurry, easy generation seepage, prints lines edge blurry simultaneously, at this moment needs to change scraper;
(7) observe ink wire mark before dry ink, after wire mark disappears, carry out drying by ultraviolet again; Time dry, under 35-45 DEG C of temperature environment, adopt ultraviolet cold light lamp to carry out printing down, copying time is 3-6 minute, and the distance between fluorescent tube and glass is 7-10cm.
Above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), toluene and pentyl acetate are mixed according to weight ratio 1-2:1-2, after being heated to 70-75 DEG C, the printing surface of polyethylene plastic film is soaked, make printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the chromic acid solution of oleum, red fuming nitric acid (RFNA), mass fraction 20-25% and the sulfuric acid solution of mass fraction 30-35% are mixed according to weight ratio 3-4:1-2:0.5-1:0.5-1, at 24-26 DEG C of temperature, the printing surface of polyethylene plastic film is soaked, make printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
In above-mentioned steps (4), in the alcohol of cleaning stock, add antistatic agent.
Screen printing forme after using is soaked 40-60 second in the sodium hydrate aqueous solution of temperature 80-85 DEG C, print material self falling; Then screen mesh printing plate clear water is rinsed, be placed on free from dust place after drying and preserve.
The longitude and latitude netting twine of above-mentioned silk screen and the angle of screen frame are 22-25 °.
After adopting technique scheme, method for printing screen of the present invention, because it has carried out breakthrough improvement to concrete grammar step, compared with prior art, it can effectively avoid occurring that photoresists loosely during actual printing, scumming, ink colorant is uneven, loosely, ink logo is out of shape, have bubble trace, wire mark, edge uneven, pin hole, the practical problems such as network blocking, printing quality significantly improves, practical.
Detailed description of the invention
In order to explain technical scheme of the present invention further, be described in detail below by specific embodiment.
A kind of method for printing screen of the present invention, embodiment one, comprises the steps:
(1) when joining glue, by bisphenol-A epoxy resin, polyvinyl alcohol, melamine modified phenolic resin, repefral, acrylic glycidol ether, for sodium cellulose glycolate, N-(the chloro-4-aminomethyl phenyl of 3-)-N, trimethylolethane, Tween 20, dimethyl methyl phosphonate, anhydrous acetic acid, sodium acetate, ethanol, water, ammonium dichromate mixes according to weight ratio 85:26.5:9:22:21:5:3:8.5:4:0.45:2.5:0.9:0.7:280:5, and carry out stirring 9 minutes by non-metallic rods, should carry out with " ∞ " shape during stirring, stirring can not be pulled back and forth, wherein anhydrous acetic acid and sodium acetate, and the water of ammonium dichromate and 20 weight ratios respectively first preparation after together join again other batching in, aforementioned all water is the distilled water that temperature is 38 DEG C, the adhesion of this photoresists and silk screen is strong, there are excellent chemical resistance and rub resistance, press resistance rate is high, cylinder platemaking development is clear, do not block mesh, and can improve the tensile property of printing cylinder in printing process, improve service life of silk screen, shorten the time for exposure, improve the binding strength of glue-line and silk screen, by force, resolution ratio is high for resistance to flushing fastness, non-volatility organic compound in preparation process, little to the pollution of environment, low to human injury,
Then the photoresists prepared are placed 3 hours under the condition of 36 DEG C, treat bubble effusion wherein, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then be placed in 35 DEG C of dustfree environments and dry, the dry thickness of photosensitive layer is 6.5% of screen thickness, and the dry thickness of photosensitive layer is greater than the roughness Rz value of silk screen, in coating process, the thickness controlling photosensitive layer and whole screen printing forme is very important, and time blocked up, shadow level is inseparable, and high high light can not print; The coarse injustice of half tone, can cause the improper increase in site, tone variations, again can not proof strength and print request when crossing thin;
By taking a picture, the positive image egative film made is close on photosensitive layer, through fluorescent lamp or dysprosium lamp exposure, and lamp distance 50cm, 6 minutes time for exposure; By the water development 1 minute of exposed photosensitive layer with 0 DEG C, after pattern all presents, rinse with clear water immediately and dry, pattern development quality can be improved;
Choose yellow plain weave polyester net, order number is 250 orders, 2.5 times of the maximum ink particle diameter of Kong Changwei of grid, the diffuse reflection of exposure light when yellow-coloured polyester silk screen can reduce printing down, and exposure accuracy is higher, and the precision of ink logo edge line is higher; Use the mixed liquor of phosphoric acid according to weight ratio 2:1:1 of phenol, cresols and mass fraction 35%, process is carried out 5 minutes to the ink surface of silk screen, then rinse out with clear water, repeatedly carry out 2 times, with clear water, screen bath is clean and dry after process, this method is Physical cleaning silk screen, and operation is simple and cleaning effect is good; Select concentrated cleaning, the two sides of silk screen is all smeared evenly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, ensure that silk screen does not have residual foam, and avoid being touched by other objects, especially point and do not touch silk screen; Successively with caustic alkali and cleaning agent, cleaning by degreasing is carried out to silk screen again, then rinse with clear water, and carry out drying; After cleaning in the environment of a free from dust dry silk screen, make uniform stream flow through silk screen surface, and the same day washes net, the same day is coated with photoresists, and before can preventing gluing like this, silk screen falls upper dust again;
Aluminium alloy or steel screen frame, clean up the one side that screen frame and silk screen bond, rub gently with fine sandpaper, make screen frame rough surface, is easy to the bonding force improving screen frame and silk screen like this; Screen frame after cleaning before the net that stretches tight, first dries at the face precoating layer adhesive glue with mesh contacts;
Adopt craft or the net machine that stretches tight to carry out stretching tight net, tiltedly stretch tight net, and the longitude and latitude netting twine of silk screen becomes 20 ° of angles with screen frame, is conducive to reducing site incompleteness, makes small characters, lines more perfect; Stretch tight net time, initial tensile force is the uniform tension in order of 15N/cm, same set of half tone, drew in the net once every 55 minutes later, measure half tone tension force with tensometer after 11 hours, make tension force be 24N/cm, and each several part tension difference is less than or equal to 1N/cm, make silk screen tension force more even; Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines; After silk screen tension, silk screen and screen frame are adjacent to, and at silk screen and screen frame contact portion coat binding glue again, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applying pressure, makes more firm bonding with screen frame of silk screen; After glue drying to be bonded, unclamp the net machine tensile force that stretches tight, cut off the silk screen of surrounding outside screen frame, be then posted on the silk screen position bonding with screen frame with one side adhesive sticker paper tape; Rinse silk screen with cleaning agent and clear water again, after silk screen dries, just can be used for photoresists coating;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of above-mentioned silk screen with photoresists aspect close and firm, then carry out drying, after drying, throw off soft substrate.
(3) adopt Re-exposing method to carry out cure process to screen printing forme, the re-expose time is 1 times of time for exposure first time in above-mentioned steps (1); Printed patterns edge is neatly cut; Then the other defect of screen printing forme is studied for a second time courses one has flunked with hole-blocking agent; Screen printing forme, after repairing, adds in non-inking part and is coated with one deck varnish protection space of a whole page, guarantee that pattern development quality improves further;
(4) keep workshop to clean, workshop temperature 24 DEG C, humidity is 21.8g/m
3, this temperature matches with humidity, and close to saturation state, suitable ink is brought into normal play characteristic, makes ink not easily in use become sticky thick gradually and the problem such as network blocking or scumming occurs; Print station is cleared up and flattens; Chemical treatment, flame treatment, electron bombardment or coupling agent pretreatment are carried out to the upper and lower surface of stock, then alcohol rub is adopted to clear up to the upper and lower surface of stock, and printed 1 minute time, ink anchor effect on the substrate can be improved, strengthen adhesion;
Ink adopts uv ink, by polyester acrylate resin, aldehyde ketone resin, laurate modified epoxy acrylate resin, trihydroxy methyl propane triacrylate, isopropyl thioxanthone, three (N-nitroso-N-Phenylhydroxylamine) aluminium salt, ink emulsion resistance auxiliary agent, fumed silica, terminal carboxyl polyester, modified polyethylene wax powder, nano-calcium carbonate, water-based magnesium carbonate, tri (propylene glycol) diacrylate and trihydroxy methyl propane triacrylate carry out mix and blend according to weight ratio 43:5:5.5:20:4.6:0.39:0.19:1.3:0.85:0.75:3.6:4.3:0.56:2.6, and the colorant of appropriate corresponding color is added according to color demand, aforementioned various ink formulations is all in solid-state, 5 microns are less than through being ground to particle size, the fineness of ink is less than 10 microns, with the hot water of appropriate 80 DEG C and aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, mix and blend is carried out 20 minutes to ink, make the fluidity of ink be 30mm, the viscosity of ink is 4000 centipoises, and this ink has conforming property, resistance to print is strong, stability of characteristics is reliable, pattern is even, level and smooth, smooth and easy, uv curing rate is fast, effective, and adhesive force is large, difficult drop-off, the advantages such as printing effect is good, ink before use with filter screen filtration once, can filtering ink skin and other various impurity, described ink emulsion resistance auxiliary agent be by weight average molecular weight be 50000 phenolic resins, weight average molecular weight be 1500 phenolic resins, linseed oil, organo-aluminium gel, lauric fatty acid isobutyl ester carry out mix and blend according to weight ratio 22:7:34:3.5:28 and make,
Scraper adopts polyurethane rubber or Viton material, and hardness is HS80, and cutting edge pressure is at 10N/cm
2, the speed of travel of scraper is at 200mm/s, and scraper and silk screen angulation are 45 °, keep scraper to contact with web lines in printing process, this line and the scraper direction of motion perpendicular;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as stock, through several examination printings, the strong oil suction performance of ink of newsprint, letterpress paper or writing paper made from bamboo can be utilized, dust on removing screen printing forme and foreign matter, avoid pin-hole phenomena;
(6) formally print, along with the wearing and tearing of scraper cutting edge, blade shape is circular arc, sharply increase the component of slurry towards silk screen direction, the pressure that silk screen acts on silk screen unit are obviously reduces, and the actual angle of scraper cutting edge place and silk screen is much smaller than 45 °, after printing, silk screen surface has leftover slurry, easy generation seepage, prints lines edge blurry simultaneously, at this moment needs to change scraper;
(7) observe ink wire mark before dry ink, after wire mark disappears, carry out drying by ultraviolet again; Time dry, under 35 DEG C of temperature environments, adopt ultraviolet cold light lamp to carry out printing down, copying time is 3 minutes, and the distance between fluorescent tube and glass is 7cm, wire mark can be made so fully to flow spread apart, retain wire mark, affect printing quality after effectively avoiding drying.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), toluene and pentyl acetate are mixed according to weight ratio 1:2, after being heated to 70 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the chromic acid solution of oleum, red fuming nitric acid (RFNA), mass fraction 20% and the sulfuric acid solution of mass fraction 35% are mixed according to weight ratio 3:2:0.5:1, at 24 DEG C of temperature, the printing surface of polyethylene plastic film is soaked, make printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the nitric acid of the sulfuric acid of mass fraction 55% and mass fraction 50% is mixed according to weight ratio 1:1, after being heated to 90 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), heavy potassium plumbite, sulfuric acid and distilled water are mixed according to weight ratio 3:7:20, after being heated to 70 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, after finishing printing, use demoulding powder to carry out demoulding to photoresists, after demoulding completes, with clear water, the dissolving that demoulding powder carries out 4 times is rinsed and poured out operation, the thorough demoulding can be realized.
Preferably, when dissolving demoulding powder, after the sulfuric acid of mass fraction 30% and water being mixed according to weight ratio 1:100, dissolving being carried out to demoulding powder and rinses.
Preferably, the screen printing forme after using was soaked for 40 seconds in the sodium hydrate aqueous solution of temperature 80 DEG C, print material self falling, thoroughly can remove print material and wait impurity, realize reusing of screen printing forme; Then screen mesh printing plate clear water is rinsed, be placed on free from dust place after drying and preserve.
Preferably, in order to avoid producing electrostatic in printing process, affecting normal inking, producing network blocking fault, the situation having a strong impact on printing quality such as to be held by silk screen in the moment that stock exports and occur.In above-mentioned steps (4), in the alcohol of cleaning stock, add antistatic agent.
Preferably, in order to improve printing quality further, the longitude and latitude netting twine of above-mentioned silk screen and the angle of screen frame are for being 22 °.
Embodiment two, comprises the steps:
(1) when joining glue, by bisphenol-A epoxy resin, polyvinyl alcohol, melamine modified phenolic resin, repefral, acrylic glycidol ether, for sodium cellulose glycolate, N-(the chloro-4-aminomethyl phenyl of 3-)-N, trimethylolethane, Tween 20, dimethyl methyl phosphonate, anhydrous acetic acid, sodium acetate, ethanol, water, ammonium dichromate mixes according to weight ratio 90:25:11:20:23.5:4.6:5:8:5:0.35:3:0.8:0.75:260:5.3, and carry out stirring 10 minutes by non-metallic rods, should carry out with " ∞ " shape during stirring, stirring can not be pulled back and forth, wherein anhydrous acetic acid and sodium acetate, and the water of ammonium dichromate and 21 weight ratios respectively first preparation after together join again other batching in, aforementioned all water is the distilled water that temperature is 20 DEG C, the adhesion of this photoresists and silk screen is strong, there are excellent chemical resistance and rub resistance, press resistance rate is high, cylinder platemaking development is clear, do not block mesh, and can improve the tensile property of printing cylinder in printing process, improve service life of silk screen, shorten the time for exposure, improve the binding strength of glue-line and silk screen, by force, resolution ratio is high for resistance to flushing fastness, non-volatility organic compound in preparation process, little to the pollution of environment, low to human injury,
Then the photoresists prepared are placed 4 hours under the condition of 25 DEG C, treat bubble effusion wherein, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then be placed in 40 DEG C of dustfree environments and dry, the dry thickness of photosensitive layer is 8% of screen thickness, and the dry thickness of photosensitive layer is greater than the roughness Rz value of silk screen, in coating process, the thickness controlling photosensitive layer and whole screen printing forme is very important, and time blocked up, shadow level is inseparable, and high high light can not print; The coarse injustice of half tone, can cause the improper increase in site, tone variations, again can not proof strength and print request when crossing thin;
By taking a picture, the positive image egative film made is close on the silk screen of coated photoresists, through fluorescent lamp or dysprosium lamp exposure, and lamp distance 55cm, 7 minutes time for exposure; By the water development 1.5 minute of exposed screen printing forme with 20 DEG C, after pattern all presents, rinse with clear water immediately and dry, pattern development quality can be improved;
Choose yellow plain weave polyester net, order number is 265 orders, 3.75 times of the maximum ink particle diameter of Kong Changwei of grid, the diffuse reflection of exposure light when yellow-coloured polyester silk screen can reduce printing down, and exposure accuracy is higher, and the precision of ink logo edge line is higher; Use the mixed liquor of phosphoric acid according to weight ratio 2:1:1 of phenol, cresols and mass fraction 40%, process is carried out 5.5 minutes to the ink surface of silk screen, then rinse out with clear water, repeatedly carry out 2 times, with clear water, screen bath is clean and dry after process, this method is chemical method cleaning silk screen, and operation is simple and cleaning effect is good; Select concentrated cleaning, the two sides of silk screen is all smeared evenly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, ensure that silk screen does not have residual foam, and avoid being touched by other objects, especially point and do not touch silk screen; Successively with caustic alkali and cleaning agent, cleaning by degreasing is carried out to silk screen again, then rinse with clear water, and carry out drying; After cleaning in the environment of a free from dust dry silk screen, make uniform stream flow through silk screen surface, and the same day washes net, the same day is coated with photoresists, and before can preventing gluing like this, silk screen falls upper dust again;
Aluminium alloy or steel screen frame, clean up the one side that screen frame and silk screen bond, rub gently with fine sandpaper, make screen frame rough surface, is easy to the bonding force improving screen frame and silk screen like this; Screen frame after cleaning before the net that stretches tight, first dries at the face precoating layer adhesive glue with mesh contacts;
Adopt craft or the net machine that stretches tight to carry out stretching tight net, tiltedly stretch tight net, and the longitude and latitude netting twine of silk screen becomes 27.5 ° of angles with screen frame, is conducive to reducing site incompleteness, makes small characters, lines more perfect; Stretch tight net time, initial tensile force is the uniform tension in order of 16.5N/cm, same set of half tone, drew in the net once every 60 minutes later, measure half tone tension force with tensometer after 12 hours, make tension force be 24.5N/cm, and each several part tension difference is less than or equal to 1N/cm, make silk screen tension force more even; Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines; After silk screen tension, silk screen and screen frame are adjacent to, and at silk screen and screen frame contact portion coat binding glue again, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applying pressure, makes more firm bonding with screen frame of silk screen; After glue drying to be bonded, unclamp the net machine tensile force that stretches tight, cut off the silk screen of surrounding outside screen frame, be then posted on the silk screen position bonding with screen frame with one side adhesive sticker paper tape; Rinse silk screen with cleaning agent and clear water again, after silk screen dries, just can be used for photoresists coating;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of above-mentioned silk screen with photoresists aspect close and firm, then carry out drying, after drying, throw off soft substrate;
(3) adopt Re-exposing method to carry out cure process to screen printing forme, the re-expose time is 2 times of time for exposure first time in above-mentioned steps (1); Printed patterns edge is neatly cut; Then the other defect of screen printing forme is studied for a second time courses one has flunked with hole-blocking agent; Screen printing forme, after repairing, adds in non-inking part and is coated with one deck varnish protection space of a whole page, guarantee that pattern development quality improves further;
(4) keep workshop to clean, workshop temperature 25 DEG C, humidity is 23g/m
3, this temperature matches with humidity, and close to saturation state, suitable ink is brought into normal play characteristic, makes ink not easily in use become sticky thick gradually and the problem such as network blocking or scumming occurs; Print station is cleared up and flattens; Chemical treatment, flame treatment, electron bombardment or coupling agent pretreatment are carried out to the upper and lower surface of stock, then alcohol rub is adopted to clear up to the upper and lower surface of stock, and printed 5 minutes time, ink anchor effect on the substrate can be improved, strengthen adhesion;
Ink adopts uv ink, by polyester acrylate resin, aldehyde ketone resin, laurate modified epoxy acrylate resin, trihydroxy methyl propane triacrylate, isopropyl thioxanthone, three (N-nitroso-N-Phenylhydroxylamine) aluminium salt, ink emulsion resistance auxiliary agent, fumed silica, terminal carboxyl polyester, modified polyethylene wax powder, nano-calcium carbonate, water-based magnesium carbonate, tri (propylene glycol) diacrylate and trihydroxy methyl propane triacrylate carry out mix and blend according to weight ratio 44:4.5:6:19:4.7:0.38:0.20:1.2:0.87:0.74:3.7:4.2:0.57:2.5, and the colorant of appropriate corresponding color is added according to color demand, aforementioned various ink formulations is all in solid-state, 5 microns are less than through being ground to particle size, the fineness of ink is less than 10 microns, with the hot water of appropriate 85 DEG C and aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, mix and blend is carried out 30 minutes to ink, make the fluidity of ink be 40mm, the viscosity of ink is 10000 centipoises, and this ink has conforming property, resistance to print is strong, stability of characteristics is reliable, pattern is even, level and smooth, smooth and easy, uv curing rate is fast, effective, and adhesive force is large, difficult drop-off, the advantages such as printing effect is good, filter screen filtration twice used before use by ink, can filtering ink skin and other various impurity, described ink emulsion resistance auxiliary agent be by weight average molecular weight be 100000 phenolic resins, weight average molecular weight be 2500 phenolic resins, linseed oil, organo-aluminium gel, lauric fatty acid isobutyl ester carry out mix and blend according to weight ratio 23:5:36:2.5:30 and make,
Scraper adopts polyurethane rubber or Viton material, and hardness is HS85, and cutting edge pressure is at 12N/cm
2, the speed of travel of scraper is at 220mm/s, and scraper and silk screen angulation are 60 °, keep scraper to contact with web lines in printing process, this line and the scraper direction of motion perpendicular;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as stock, through several examination printings, the strong oil suction performance of ink of newsprint, letterpress paper or writing paper made from bamboo can be utilized, dust on removing screen printing forme and foreign matter, avoid pin-hole phenomena;
(6) formally print, along with the wearing and tearing of scraper cutting edge, blade shape is circular arc, sharply increase the component of slurry towards silk screen direction, the pressure that silk screen acts on silk screen unit are obviously reduces, and the actual angle of scraper cutting edge place and silk screen is much smaller than 45 °, after printing, silk screen surface has leftover slurry, easy generation seepage, prints lines edge blurry simultaneously, at this moment needs to change scraper;
(7) observe ink wire mark before dry ink, after wire mark disappears, carry out drying by ultraviolet again; Time dry, under 40 DEG C of temperature environments, adopt ultraviolet cold light lamp to carry out printing down, copying time is 4.5 minutes, and the distance between fluorescent tube and glass is 8cm, wire mark can be made so fully to flow spread apart, retain wire mark, affect printing quality after effectively avoiding drying.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), toluene and pentyl acetate are mixed according to weight ratio 1:1, after being heated to 73 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the chromic acid solution of oleum, red fuming nitric acid (RFNA), mass fraction 22% and the sulfuric acid solution of mass fraction 33% are mixed according to weight ratio 3.5:1.5:0.7:0.8, at 25 DEG C of temperature, the printing surface of polyethylene plastic film is soaked, make printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the nitric acid of the sulfuric acid of mass fraction 57% and mass fraction 47% is mixed according to weight ratio 2.5:1.5, after being heated to 95 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), heavy potassium plumbite, sulfuric acid and distilled water are mixed according to weight ratio 3:7:20, after being heated to 72 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, after finishing printing, use demoulding powder to carry out demoulding to photoresists, after demoulding completes, with clear water, the dissolving that demoulding powder carries out 6 times is rinsed and poured out operation, the thorough demoulding can be realized.
Preferably, when dissolving demoulding powder, after the sulfuric acid of mass fraction 35% and water being mixed according to weight ratio 3:100, dissolving being carried out to demoulding powder and rinses.
Preferably, the screen printing forme after using was soaked for 50 seconds in the sodium hydrate aqueous solution of temperature 82 DEG C, print material self falling, thoroughly can remove print material and wait impurity, realize reusing of screen printing forme; Then screen mesh printing plate clear water is rinsed, be placed on free from dust place after drying and preserve.
Preferably, in order to avoid producing electrostatic in printing process, affecting normal inking, producing network blocking fault, the situation having a strong impact on printing quality such as to be held by silk screen in the moment that stock exports and occur.In above-mentioned steps (4), in the alcohol of cleaning stock, add antistatic agent.
Preferably, in order to improve printing quality further, the longitude and latitude netting twine of above-mentioned silk screen and the angle of screen frame are for being 23.5 °.
Embodiment three, comprises the steps:
(1) when joining glue, by bisphenol-A epoxy resin, polyvinyl alcohol, melamine modified phenolic resin, repefral, acrylic glycidol ether, for sodium cellulose glycolate, N-(the chloro-4-aminomethyl phenyl of 3-)-N, trimethylolethane, Tween 20, dimethyl methyl phosphonate, anhydrous acetic acid, sodium acetate, ethanol, water, ammonium dichromate mixes according to weight ratio 93:24:12:19:26:4.5:6.5:7:5.5:0.3:3.4:0.6:0.8:240:5.5, and carry out stirring 11 minutes by non-metallic rods, should carry out with " ∞ " shape during stirring, stirring can not be pulled back and forth, wherein anhydrous acetic acid and sodium acetate, and the water of ammonium dichromate and 22 weight ratios respectively first preparation after together join again other batching in, aforementioned all water is the distilled water that temperature is 10 DEG C, the adhesion of this photoresists and silk screen is strong, there are excellent chemical resistance and rub resistance, press resistance rate is high, cylinder platemaking development is clear, do not block mesh, and can improve the tensile property of printing cylinder in printing process, improve service life of silk screen, shorten the time for exposure, improve the binding strength of glue-line and silk screen, by force, resolution ratio is high for resistance to flushing fastness, non-volatility organic compound in preparation process, little to the pollution of environment, low to human injury,
Then the photoresists prepared are placed 5 hours under the condition of 15 DEG C, treat bubble effusion wherein, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then be placed in 45 DEG C of dustfree environments and dry, the dry thickness of photosensitive layer is 9% of screen thickness, and the dry thickness of photosensitive layer is greater than the roughness Rz value of silk screen, in coating process, the thickness controlling photosensitive layer and whole screen printing forme is very important, and time blocked up, shadow level is inseparable, and high high light can not print; The coarse injustice of half tone, can cause the improper increase in site, tone variations, again can not proof strength and print request when crossing thin;
By taking a picture, the positive image egative film made is close on the silk screen of coated photoresists, through fluorescent lamp or dysprosium lamp exposure, and lamp distance 60cm, 8 minutes time for exposure; By the water development 2 minute of exposed screen printing forme with 35 DEG C, after pattern all presents, rinse with clear water immediately and dry, pattern development quality can be improved;
Choose yellow plain weave polyester net, order number is 280 orders, 5 times of the maximum ink particle diameter of Kong Changwei of grid, the diffuse reflection of exposure light when yellow-coloured polyester silk screen can reduce printing down, and exposure accuracy is higher, and the precision of ink logo edge line is higher; Use the mixed liquor of phosphoric acid according to weight ratio 2:1:1 of phenol, cresols and mass fraction 45%, process is carried out 6 minutes to the ink surface of silk screen, then rinse out with clear water, repeatedly carry out 3 times, with clear water, screen bath is clean and dry after process, this method is chemical method cleaning silk screen, and operation is simple and cleaning effect is good; Select concentrated cleaning, the two sides of silk screen is all smeared evenly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, ensure that silk screen does not have residual foam, and avoid being touched by other objects, especially point and do not touch silk screen; Successively with caustic alkali and cleaning agent, cleaning by degreasing is carried out to silk screen again, then rinse with clear water, and carry out drying; After cleaning in the environment of a free from dust dry silk screen, make uniform stream flow through silk screen surface, and the same day washes net, the same day is coated with photoresists, and before can preventing gluing like this, silk screen falls upper dust again;
Aluminium alloy or steel screen frame, clean up the one side that screen frame and silk screen bond, rub gently with fine sandpaper, make screen frame rough surface, is easy to the bonding force improving screen frame and silk screen like this; Screen frame after cleaning before the net that stretches tight, first dries at the face precoating layer adhesive glue with mesh contacts;
Adopt craft or the net machine that stretches tight to carry out stretching tight net, tiltedly stretch tight net, and the longitude and latitude netting twine of silk screen becomes 35 ° of angles with screen frame, is conducive to reducing site incompleteness, makes small characters, lines more perfect; Stretch tight net time, initial tensile force is the uniform tension in order of 18N/cm, same set of half tone, drew in the net once every 65 minutes later, measure half tone tension force with tensometer after 13 hours, make tension force be 25N/cm, and each several part tension difference is less than or equal to 1N/cm, make silk screen tension force more even; Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines; After silk screen tension, silk screen and screen frame are adjacent to, and at silk screen and screen frame contact portion coat binding glue again, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applying pressure, makes more firm bonding with screen frame of silk screen; After glue drying to be bonded, unclamp the net machine tensile force that stretches tight, cut off the silk screen of surrounding outside screen frame, be then posted on the silk screen position bonding with screen frame with one side adhesive sticker paper tape; Rinse silk screen with cleaning agent and clear water again, after silk screen dries, just can be used for photoresists coating;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of above-mentioned silk screen with photoresists aspect close and firm, then carry out drying, after drying, throw off soft substrate.
(3) adopt Re-exposing method to carry out cure process to screen printing forme, the re-expose time is 3 times of time for exposure first time in above-mentioned steps (1); Printed patterns edge is neatly cut; Then the other defect of screen printing forme is studied for a second time courses one has flunked with hole-blocking agent; Screen printing forme, after repairing, adds in non-inking part and is coated with one deck varnish protection space of a whole page, guarantee that pattern development quality improves further;
(4) keep workshop to clean, workshop temperature 26 DEG C, humidity is 24.4g/m
3, this temperature matches with humidity, and close to saturation state, suitable ink is brought into normal play characteristic, makes ink not easily in use become sticky thick gradually and the problem such as network blocking or scumming occurs; Print station is cleared up and flattens; Chemical treatment, flame treatment, electron bombardment or coupling agent pretreatment are carried out to the upper and lower surface of stock, then alcohol rub is adopted to clear up to the upper and lower surface of stock, and printed 8 minutes time, ink anchor effect on the substrate can be improved, strengthen adhesion;
Ink adopts uv ink, by polyester acrylate resin, aldehyde ketone resin, laurate modified epoxy acrylate resin, trihydroxy methyl propane triacrylate, isopropyl thioxanthone, three (N-nitroso-N-Phenylhydroxylamine) aluminium salt, ink emulsion resistance auxiliary agent, fumed silica, terminal carboxyl polyester, modified polyethylene wax powder, nano-calcium carbonate, water-based magnesium carbonate, tri (propylene glycol) diacrylate and trihydroxy methyl propane triacrylate carry out mix and blend according to weight ratio 44.5:4:7:18:4.75:0.36:0.22:1.1:0.88:0.73:3.9:4.1:0.59:2. 4, and the colorant of appropriate corresponding color is added according to color demand, aforementioned various ink formulations is all in solid-state, 5 microns are less than through being ground to particle size, the fineness of ink is less than 10 microns, with the hot water of appropriate 90 DEG C and aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, mix and blend is carried out 40 minutes to ink, make the fluidity of ink be 50mm, the viscosity of ink is 12000 centipoises, and this ink has conforming property, resistance to print is strong, stability of characteristics is reliable, pattern is even, level and smooth, smooth and easy, uv curing rate is fast, effective, and adhesive force is large, difficult drop-off, the advantages such as printing effect is good, ink uses filter screen filtration three times before use, can filtering ink skin and other various impurity, described ink emulsion resistance auxiliary agent be by weight average molecular weight be 150000 phenolic resins, weight average molecular weight be 4000 phenolic resins, linseed oil, organo-aluminium gel, lauric fatty acid isobutyl ester carry out mix and blend according to weight ratio 25:4:38:1.5:33 and make,
Scraper adopts polyurethane rubber or Viton material, and hardness is HS90, and cutting edge pressure is at 15N/cm
2, the speed of travel of scraper is at 250mm/s, and scraper and silk screen angulation are 75 °, keep scraper to contact with web lines in printing process, this line and the scraper direction of motion perpendicular;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as stock, through several examination printings, the strong oil suction performance of ink of newsprint, letterpress paper or writing paper made from bamboo can be utilized, dust on removing screen printing forme and foreign matter, avoid pin-hole phenomena;
(6) formally print, along with the wearing and tearing of scraper cutting edge, blade shape is circular arc, sharply increase the component of slurry towards silk screen direction, the pressure that silk screen acts on silk screen unit are obviously reduces, and the actual angle of scraper cutting edge place and silk screen is much smaller than 45 °, after printing, silk screen surface has leftover slurry, easy generation seepage, prints lines edge blurry simultaneously, at this moment needs to change scraper;
(7) observe ink wire mark before dry ink, after wire mark disappears, carry out drying by ultraviolet again; Time dry, under 45 DEG C of temperature environments, adopt ultraviolet cold light lamp to carry out printing down, copying time is 6 minutes, and the distance between fluorescent tube and glass is 10cm, wire mark can be made so fully to flow spread apart, retain wire mark, affect printing quality after effectively avoiding drying.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), toluene and pentyl acetate are mixed according to weight ratio 2:1, after being heated to 75 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the chromic acid solution of oleum, red fuming nitric acid (RFNA), mass fraction 25% and the sulfuric acid solution of mass fraction 30% are mixed according to weight ratio 4:1:1:0.5, at 26 DEG C of temperature, the printing surface of polyethylene plastic film is soaked, make printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the nitric acid of the sulfuric acid of mass fraction 60% and mass fraction 45% is mixed according to weight ratio 3:1, after being heated to 100 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), heavy potassium plumbite, sulfuric acid and distilled water are mixed according to weight ratio 3:7:20, after being heated to 75 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
Preferably, after finishing printing, use demoulding powder to carry out demoulding to photoresists, after demoulding completes, with clear water, the dissolving that demoulding powder carries out 5 times is rinsed and poured out operation, the thorough demoulding can be realized.
Preferably, when dissolving demoulding powder, after the sulfuric acid of mass fraction 40% and water being mixed according to weight ratio 5:100, dissolving being carried out to demoulding powder and rinses.
Preferably, the screen printing forme after using was soaked for 50 seconds in the sodium hydrate aqueous solution of temperature 85 DEG C, print material self falling, thoroughly can remove print material and wait impurity, realize reusing of screen printing forme; Then screen mesh printing plate clear water is rinsed, be placed on free from dust place after drying and preserve.
Preferably, in order to avoid producing electrostatic in printing process, affecting normal inking, producing network blocking fault, the situation having a strong impact on printing quality such as to be held by silk screen in the moment that stock exports and occur.In above-mentioned steps (4), in the alcohol of cleaning stock, add antistatic agent.
Preferably, in order to improve printing quality further, the longitude and latitude netting twine of above-mentioned silk screen and the angle of screen frame are for being 25 °.
Silk-screen printing technique of the present invention, wherein each composition parameter and concrete technology mode of operation all can carry out adjusting and designing according to actual requirement.
Process form of the present invention is not limited to this case embodiment, and anyone carries out suitable change or the modification of similar thinking to it, all should be considered as not departing from patent category of the present invention.
Claims (6)
1. a method for printing screen, is characterized in that, comprises the steps:
(1) when joining glue, by bisphenol-A epoxy resin, polyvinyl alcohol, melamine modified phenolic resin, repefral, acrylic glycidol ether, for sodium cellulose glycolate, N-(the chloro-4-aminomethyl phenyl of 3-)-N, trimethylolethane, Tween 20, dimethyl methyl phosphonate, anhydrous acetic acid, sodium acetate, ethanol, water, ammonium dichromate mixes according to weight ratio 85-93:24-26.5:9-12:19-22:21-26:4.5-5:3-6.5:7-8.5:4-5.5:0 .3-0.45:2.5-3.4:0.6-0.9:0.7-0.8:240-280:5-5.5, and carry out stirring 9-11 minute by non-metallic rods, should carry out with " ∞ " shape during stirring, stirring can not be pulled back and forth, wherein anhydrous acetic acid and sodium acetate, and the water of ammonium dichromate and 20-22 weight ratio respectively first preparation after together join again other batching in, aforementioned all water is the distilled water that temperature is less than 38 DEG C,
Then the photoresists prepared are placed 3-5 hour under lower than the condition of 38 DEG C, treat bubble effusion wherein, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then be placed in 35-45 DEG C of dustfree environment and dry, the dry thickness of photosensitive layer is the 6.5-9% of screen thickness, and the dry thickness of photosensitive layer is greater than the roughness Rz value of silk screen;
By taking a picture, the positive image egative film made is close on photosensitive layer, and through fluorescent lamp or dysprosium lamp exposure, lamp is apart from 50-60cm, time for exposure 6-8 minute; By the water development 1-2 minute of exposed photosensitive layer 0-35 DEG C, after pattern all presents, rinse with clear water immediately and dry;
Choose yellow plain weave polyester net, order number is 250-280 order, and the 2.5-5 of the maximum ink particle diameter of Kong Changwei of grid doubly; Use the phosphoric acid of phenol, cresols and mass fraction 35-45% according to the mixed liquor of weight ratio 2:1:1, process 5-6 minute is carried out to the ink surface of silk screen, then rinses out with clear water, repeatedly carry out 2-3 time, with clear water, screen bath is clean and dry after process; Select concentrated cleaning, the two sides of silk screen is all smeared evenly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, ensure that silk screen does not have residual foam, and avoid being touched by other objects; Successively with caustic alkali and cleaning agent, cleaning by degreasing is carried out to silk screen again, then rinse with clear water, and carry out drying; After cleaning in the environment of a free from dust dry silk screen, make uniform stream flow through silk screen surface, and the same day washes net, the same day is coated with photoresists;
Aluminium alloy or steel screen frame, clean up the one side that screen frame and silk screen bond, rub gently with fine sandpaper, make screen frame rough surface; Screen frame after cleaning before the net that stretches tight, first dries at the face precoating layer adhesive glue with mesh contacts;
Adopt craft or the net machine that stretches tight to carry out stretching tight net, tiltedly stretch tight net, and the longitude and latitude netting twine of silk screen becomes 20-35 ° of angle with screen frame; Stretch tight net time, initial tensile force is the uniform tension in order of 15-18N/cm, same set of half tone, draws in the net once every 55-65 minute later, measures half tone tension force, make tension force be 24-25N/cm, and each several part tension difference is less than or equal to 1N/cm after 11-13 hour with tensometer; Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines; After silk screen tension, silk screen and screen frame are adjacent to, and at silk screen and screen frame contact portion coat binding glue again, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applying pressure, makes more firm bonding with screen frame of silk screen; After glue drying to be bonded, unclamp the net machine tensile force that stretches tight, cut off the silk screen of surrounding outside screen frame, be then posted on the silk screen position bonding with screen frame with one side adhesive sticker paper tape; Rinse silk screen with cleaning agent and clear water again, after silk screen dries, just can be used for photoresists coating;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of above-mentioned silk screen with photoresists aspect close and firm, then carry out drying, after drying, throw off soft substrate;
(3) adopt Re-exposing method to carry out cure process to screen printing forme, the re-expose time be the 1-3 of time for exposure first time in above-mentioned steps (1) doubly; Printed patterns edge is neatly cut; Then the other defect of screen printing forme is studied for a second time courses one has flunked with hole-blocking agent; Screen printing forme, after repairing, adds in non-inking part and is coated with one deck varnish protection space of a whole page;
(4) keep workshop to clean, workshop temperature 24-26 DEG C, humidity is 21.8-24.4g/m
3; Print station is cleared up and flattens; Chemical treatment, flame treatment, electron bombardment or coupling agent pretreatment are carried out to the upper and lower surface of stock, then adopts alcohol rub to clear up to the upper and lower surface of stock, and printed in 1-8 minute;
Ink adopts uv ink, by polyester acrylate resin, aldehyde ketone resin, laurate modified epoxy acrylate resin, trihydroxy methyl propane triacrylate, isopropyl thioxanthone, three (N-nitroso-N-Phenylhydroxylamine) aluminium salt, ink emulsion resistance auxiliary agent, fumed silica, terminal carboxyl polyester, modified polyethylene wax powder, nano-calcium carbonate, water-based magnesium carbonate, tri (propylene glycol) diacrylate and trihydroxy methyl propane triacrylate carry out mix and blend according to weight ratio 43-44.5:4-5:5.5-7:18-20:4.6-4.75:0.36-0.39:0.19-0.22:1.1-1.3:0.85-0.88:0.73-0.75:3.6-3.9:4.1-4.3:0.56-0.59:2.4-2.6, and the colorant of appropriate corresponding color is added according to color demand, aforementioned various ink formulations is all in solid-state, 5 microns are less than through being ground to particle size, the fineness of ink is less than 10 microns, with appropriate more than 80 DEG C hot water and aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, mix and blend 20-40 minute is carried out to ink, make the fluidity of ink be 30-50mm, the viscosity of ink is 4000-12000 centipoise, ink before use with filter screen filtration at least one times, the phenolic resins that described ink emulsion resistance auxiliary agent is is the phenolic resins of 50000-150000 by weight average molecular weight, weight average molecular weight is 1500-4000, linseed oil, organo-aluminium gel, lauric fatty acid isobutyl ester carry out mix and blend according to weight ratio 22-25:4-7:34-38:1.5-3.5:28-33 and make,
Scraper adopts polyurethane rubber or Viton material, and hardness is HS80-90, and cutting edge pressure is at 10-15N/cm
2, the speed of travel of scraper is at 200-250mm/s, and scraper and silk screen angulation are 45-75 °, keep scraper to contact with web lines in printing process, this line and the scraper direction of motion perpendicular;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as stock, through several examination printings, the dust on removing screen printing forme and foreign matter, avoid pin-hole phenomena;
(6) formally print, along with the wearing and tearing of scraper cutting edge, blade shape is circular arc, sharply increase the component of slurry towards silk screen direction, the pressure that silk screen acts on silk screen unit are obviously reduces, and the actual angle of scraper cutting edge place and silk screen is much smaller than 45 °, after printing, silk screen surface has leftover slurry, easy generation seepage, prints lines edge blurry simultaneously, at this moment needs to change scraper;
(7) observe ink wire mark before dry ink, after wire mark disappears, carry out drying by ultraviolet again; Time dry, under 35-45 DEG C of temperature environment, adopt ultraviolet cold light lamp to carry out printing down, copying time is 3-6 minute, and the distance between fluorescent tube and glass is 7-10cm.
2. a kind of method for printing screen according to claim 1, it is characterized in that: above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), toluene and pentyl acetate are mixed according to weight ratio 1-2:1-2, after being heated to 70-75 DEG C, the printing surface of polyethylene plastic film is soaked, makes printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
3. a kind of method for printing screen according to claim 1, it is characterized in that: above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the chromic acid solution of oleum, red fuming nitric acid (RFNA), mass fraction 20-25% and the sulfuric acid solution of mass fraction 30-35% are mixed according to weight ratio 3-4:1-2:0.5-1:0.5-1, at 24-26 DEG C of temperature, the printing surface of polyethylene plastic film is soaked, make printing surface swelling, destroy partially crystallizable and improve the adhesive force of ink at stock printing surface.
4. a kind of method for printing screen according to claim 1, is characterized in that: in above-mentioned steps (4), in the alcohol of cleaning stock, add antistatic agent.
5. a kind of method for printing screen according to claim 1, is characterized in that: the screen printing forme after using is soaked 40-60 second in the sodium hydrate aqueous solution of temperature 80-85 DEG C, print material self falling; Then screen mesh printing plate clear water is rinsed, be placed on free from dust place after drying and preserve.
6. a kind of method for printing screen according to claim 1, is characterized in that: the longitude and latitude netting twine of above-mentioned silk screen and the angle of screen frame are 22-25 °.
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| CN104802552A (en) * | 2015-03-31 | 2015-07-29 | 安徽省嘉信包装印务有限公司 | Screen printing process |
| CN104802554A (en) * | 2015-03-31 | 2015-07-29 | 安徽省嘉信包装印务有限公司 | Screen printing process |
| CN104924737A (en) * | 2015-04-29 | 2015-09-23 | 安徽欧耐橡塑工业有限公司 | Silk-screen printing template manufacturing process |
| CN105059004A (en) * | 2015-08-21 | 2015-11-18 | 宁波奥克斯高科技有限公司 | Screen printing technology |
| CN106226999A (en) * | 2016-09-20 | 2016-12-14 | 村上精密制版（昆山）有限公司 | A kind of method at the rapidly coating photoresists in half tone surface |
| CN107901642A (en) * | 2017-11-09 | 2018-04-13 | 建业科技电子（惠州）有限公司 | One kind solves the not lower oily printing process of silk-screen |
| CN108987009A (en) * | 2018-08-30 | 2018-12-11 | 中国振华集团云科电子有限公司 | A kind of method for printing screen and resistor |
| CN109693464A (en) * | 2018-11-26 | 2019-04-30 | 安徽同和包装制品有限公司 | A kind of environmentally friendly specialty printing technique for reducing waste water and generating |
| CN110054926A (en) * | 2019-04-23 | 2019-07-26 | 耿海宁 | A kind of soft version and the anti-paste of relief printing plate fill in net spray preparation method |
| CN110154621A (en) * | 2019-04-26 | 2019-08-23 | 河北浩艺文化发展有限公司 | The manufacture craft of picture is hung in transparent acrylic silk-screen printing |
| CN110228307A (en) * | 2019-05-27 | 2019-09-13 | 上海秀卡工业产品设计有限公司 | Model interior trim screen silk-screen printing technique |
| CN110757972A (en) * | 2019-10-11 | 2020-02-07 | 扬州虹扬科技发展有限公司 | Retreatment process for electronic device with unqualified printed characters |
| CN110757941A (en) * | 2019-10-25 | 2020-02-07 | 杭州友成电子有限公司 | Lean screen printing plate manufacturing process |
| CN113619303A (en) * | 2021-08-09 | 2021-11-09 | 大连华瑞泰服饰有限公司 | Silica gel material for protective clothing, preparation method thereof and protective sports equipment |
| CN113635685A (en) * | 2021-08-12 | 2021-11-12 | 东莞市微科光电科技有限公司 | Screen printing method |
| CN116179125A (en) * | 2022-12-02 | 2023-05-30 | 广东工业大学 | Transparent epoxy silk-screen printing adhesive and silk-screen printing bonding process |
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| CN104802552A (en) * | 2015-03-31 | 2015-07-29 | 安徽省嘉信包装印务有限公司 | Screen printing process |
| CN104802554A (en) * | 2015-03-31 | 2015-07-29 | 安徽省嘉信包装印务有限公司 | Screen printing process |
| CN104924737A (en) * | 2015-04-29 | 2015-09-23 | 安徽欧耐橡塑工业有限公司 | Silk-screen printing template manufacturing process |
| CN105059004A (en) * | 2015-08-21 | 2015-11-18 | 宁波奥克斯高科技有限公司 | Screen printing technology |
| CN106226999A (en) * | 2016-09-20 | 2016-12-14 | 村上精密制版（昆山）有限公司 | A kind of method at the rapidly coating photoresists in half tone surface |
| CN107901642A (en) * | 2017-11-09 | 2018-04-13 | 建业科技电子（惠州）有限公司 | One kind solves the not lower oily printing process of silk-screen |
| CN108987009A (en) * | 2018-08-30 | 2018-12-11 | 中国振华集团云科电子有限公司 | A kind of method for printing screen and resistor |
| CN109693464A (en) * | 2018-11-26 | 2019-04-30 | 安徽同和包装制品有限公司 | A kind of environmentally friendly specialty printing technique for reducing waste water and generating |
| CN110054926A (en) * | 2019-04-23 | 2019-07-26 | 耿海宁 | A kind of soft version and the anti-paste of relief printing plate fill in net spray preparation method |
| CN110154621A (en) * | 2019-04-26 | 2019-08-23 | 河北浩艺文化发展有限公司 | The manufacture craft of picture is hung in transparent acrylic silk-screen printing |
| CN110228307A (en) * | 2019-05-27 | 2019-09-13 | 上海秀卡工业产品设计有限公司 | Model interior trim screen silk-screen printing technique |
| CN110757972A (en) * | 2019-10-11 | 2020-02-07 | 扬州虹扬科技发展有限公司 | Retreatment process for electronic device with unqualified printed characters |
| CN110757972B (en) * | 2019-10-11 | 2021-07-20 | 扬州虹扬科技发展有限公司 | Retreatment process for electronic device with unqualified printed characters |
| CN110757941A (en) * | 2019-10-25 | 2020-02-07 | 杭州友成电子有限公司 | Lean screen printing plate manufacturing process |
| CN113619303A (en) * | 2021-08-09 | 2021-11-09 | 大连华瑞泰服饰有限公司 | Silica gel material for protective clothing, preparation method thereof and protective sports equipment |
| CN113635685A (en) * | 2021-08-12 | 2021-11-12 | 东莞市微科光电科技有限公司 | Screen printing method |
| CN116179125A (en) * | 2022-12-02 | 2023-05-30 | 广东工业大学 | Transparent epoxy silk-screen printing adhesive and silk-screen printing bonding process |
| CN116179125B (en) * | 2022-12-02 | 2023-09-08 | 广东工业大学 | Transparent epoxy silk-screen printing adhesive and silk-screen printing bonding process |
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