CN104309345B - A kind of method for printing screen - Google Patents

A kind of method for printing screen Download PDF

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Publication number
CN104309345B
CN104309345B CN201410540424.7A CN201410540424A CN104309345B CN 104309345 B CN104309345 B CN 104309345B CN 201410540424 A CN201410540424 A CN 201410540424A CN 104309345 B CN104309345 B CN 104309345B
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screen
printing
silk screen
ink
stock
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CN104309345A (en
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朱爱红
罗晋平
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SHISHI DECAI CHEMICAL TECHNOLOGY Co Ltd
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SHISHI DECAI CHEMICAL TECHNOLOGY Co Ltd
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Abstract

The present invention proposes a kind of method for printing screen, generally comprise preparation photoresists and preparation, be transferred to interim soft substrate, exposure, develop, prepare screen printing forme, turn net, the method step such as maintenance, examination printing and formal printing, and on the basis of the method step, carried out careful method improved.After adopting technique scheme, the method for printing screen of the present invention, owing to concrete grammar step has been carried out breakthrough improvement by it, compared with prior art, it occurs when can be prevented effectively from actual printing that photoresists are loosely, scumming, ink colorant is uneven, loosely, ink logo deformation, has bubble trace, wire mark, edge uneven, pin hole, the practical problems such as network blocking, printing quality significantly improves, practical.

Description

A kind of method for printing screen
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, a kind of tradition indigo printing fabric physical fine resist printing new technology as open in Chinese invention patent CN201210405827.1, described indigo printing fabric processing technology 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: binding chinlon silk screen with wooden frame print edition or square steel frame print edition, coat photoresists, carry out photosensitive in darkroom, then strong part after photosensitive is preserved, lightproof part clear water rinses out;Flower version dyeing-resisted layer thickeies: adopts and is coated with Resina Toxicodendri verniciflui or three times dried formation paint films of alkyd varnish paint, and flower version flower pattern thickness is thickeied;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%, and 14% and water 55% are starched by A nation;Dyeing-resisted layer scraped by stamp: the physical fine resist printing slurry print edition covering fabric surface of synthesis, scrape by slipping through the net on bafta, forms physics dyeing-resisted layer;Repeatedly dyeing: adopt the indigo-blue chemical conversion dye liquor in the solution of pH value 9 of Indigo Naturalis, then contaminate, aoxidize, need to adopt more than 12 times dyeing according to color and luster;Removal dyeing-resisted layer cleans Final finishing finished product: dries after dyeing and scrapes off dyeing-resisted layer with cutter, then in the clear water adding one thousandth hydrogen peroxide, cleans 20 minutes with industry washer rolling, and carries out three times changing water cleaning, then shines dry finishing.Traditional silk-screened technique is different because of the mode of photosensitive lithographic, generally comprises three kinds of techniques, and the first is direct method, and step substantially prepares screen printing forme, prepares photoresists, upper photoresists, exposure, development, maintenance, printing;The second is indirect method, and step substantially prepares photoresists and preparation, is transferred to interim soft substrate, exposure, and development is prepared screen printing forme, turned net, printing;The third be straight between method, step substantially prepares screen printing forme, prepares photoresists, photosensitive sensitization, and pad pasting is dry, exposure, development, printing.
In actual use, all can there are photoresists loosely in aforementioned various technique, scumming, and ink colorant is uneven, loosely, ink logo deformation, has bubble trace, wire mark, edge uneven, and pin hole, numerous thorny problems of operator are perplexed in network blocking etc. for a long time.
In consideration of it, the problems referred to above are furtherd investigate by inventor, this case is then had to produce.
Summary of the invention
It is an object of the invention to provide one and can be prevented effectively from photoresists loosely, scumming, ink colorant is uneven, loosely, ink logo deformation, has 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:
null(1) when joining photoresists,By bisphenol A epoxide resin,Polyvinyl alcohol,Melamine modified phenolic resin,Dimethyl phthalate,Acrylic glycidyl ether,Sodium carboxymethyl cellulose,N-(the chloro-4-aminomethyl phenyl of 3-)-N,Trimethylolethane,Polyoxyethylene sorbitan monolaurate,Dimethyl methyl phosphonate,Anhydrous acetic acid,Sodium acetate,Ethanol,Water,Ammonium bichromate. 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 it is stirred 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 it is another with joining in other dispensing after the first preparation respectively of the water of the 20-22 weight portion in Ammonium bichromate. and 240-280 weight portion,Aforementioned all water is the distilled water that temperature is less than 38 DEG C;
Then the photoresists prepared are placed 3-5 hour lower than 38 DEG C when, treat that bubble therein is overflowed, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then it is placed in 35-45 DEG C of dustfree environment and dries, the 6.5-9% that dried thickness is screen thickness of photosensitive layer, and the dried thickness of photosensitive layer is more than the roughness Rz value of silk screen;
Being close on photosensitive layer by the positive image egative film that photograph is made, expose through daylight lamp or dysprosium lamp, the distance between photosensitive layer and lamp is 50-60cm, time of exposure 6-8 minute;By water development 1-2 minute of exposed photosensitive layer 0-35 DEG C, after pattern all presents, rinse with clear water immediately and dry;
Choosing yellow plain weave polyester net, order number is 250-280 order, 2.5-5 times of the maximum ink particle diameter of Kong Changwei of grid;Use the phosphoric acid mixed liquor according to weight ratio 2:1:1 of phenol, cresol and mass fraction 35-45%, carry out processing 5-6 minute to the ink surface of silk screen, then rinsing out with clear water, such process and flushing process are repeatedly performed 2-3 time, totally and are dried by screen bath with clear water after process;Select concentrated cleaning, the two sides of silk screen is all smeared uniformly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, it is ensured that silk screen does not have residual foam, and avoids being touched by other object;Successively with caustic alkali and abluent, silk screen is carried out cleaning by degreasing again, then rinse with clear water, and be dried;Drying silk screen after cleaning in the environment of a free from dust, make air-flow flow uniformly through silk screen surface, and washed net the same day, the same day is coated with photoresists;
Aluminium alloy or steel screen frame, clean up the one side of screen frame with silk screen bonding, rub gently with fine sandpaper, make screen frame rough surface;Screen frame after cleaning before the net that stretches tight, first with the face precoating layer adhesive glue of mesh contacts drying;
Adopting craft or Stretching machine tiltedly to stretch tight net, 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 15-18N/cm, and the uniform tension in order of same set of half tone was drawn in the net once every 55-65 minute later, after 11-13 hour with tonometer measure half tone tension force, making tension force is 24-25N/cm, and each several part tension difference is less than or equal to 1N/cm;Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines;Making silk screen and screen frame be adjacent to after silk screen tension, and be coated adhesive glue in silk screen and screen frame contact portion, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applies pressure, makes more firm bonding with screen frame of silk screen;Glue to be bonded is dried, unclamps Stretching machine tensile force, cuts off the silk screen of surrounding outside screen frame, is then posted on, with one side adhesive sticker paper tape, the position that silk screen is bonding with screen frame;Silk screen is rinsed again, after silk screen dries, so that it may be coated with for photoresists with abluent and clear water;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of the silk screen that above-mentioned steps (1) is ultimately produced with photoresists aspect close and firm, are then dried, throw off soft substrate after drying.
(3) adopting Re-exposing method that screen printing forme carries out cure process, the re-expose time is 1-3 times of above-mentioned steps (1) time of exposure of middle first time;Printed patterns edge is neatly cut;Then 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 one layer of varnish protection space of a whole page of painting in non-inking part;
(4) keeping workshop cleaning, temperature 24-26 DEG C of workshop, humidity is 21.8-24.4g/m3;Print station is cleared up and flattens;The upper and lower surface of stock is carried out chemical treatment, flame treatment or electron bombardment, then adopts alcohol rub to clear up the upper and lower surface of stock, and printed in 1-8 minute;
nullInk adopts UV ink,By polyester acrylate resin during configuration UV ink,Aldehyde ketone resin,Lauric acid modified epoxy acrylate resin,Trihydroxy methyl propane triacrylate,Isopropyl thioxanthone,Three (N-nitroso-group-N-Phenylhydroxylamine) aluminium salt,Ink emulsion resistance auxiliary agent,Fumed silica,Terminal carboxyl polyester,Modified polyethylene wax powder,Nano-calcium carbonate,Aqueous 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,Through being ground to particle size less than 5 microns,The fineness of ink is less than 10 microns;With appropriate more than 80 DEG C hot water, with aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, ink is carried out mix and blend 20-40 minute;The fluidity making ink is 30-50mm, and the viscosity of ink is 4000-12000 centipoise;Ink is before use by filter screen filtration at least one times;Described ink emulsion resistance auxiliary agent is that weight average molecular weight to be the phenolic resin of 50000-150000, weight average molecular weight the be phenolic resin of 1500-4000, Semen Lini oil, organo-aluminium gel, lauric fatty acid isobutyl ester are carried out mix and blend according to weight ratio 22-25:4-7:34-38:1.5-3.5:28-33 and made;
Scraper adopts polyurethane rubber or Viton material, and hardness is HS80-90, and cutting edge pressure is at 10-15N/cm2, the speed of travel of scraper is at 200-250mm/s, and scraper and silk screen angulation are 45-75 °, keeps scraper to contact with web lines in printing process, and web lines is perpendicular with the scraper direction of motion;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as examination printing stock, through several examination printings, remove the dust on screen printing forme and foreign body, it is to avoid pin-hole phenomena;
(6) formally print, abrasion along with scraper cutting edge, blade shape is circular arc, slurry is sharply increased towards the component in silk screen direction, and silk screen acts on the pressure of silk screen unit are and is obviously reduced, 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, easily there is seepage, simultaneously printing lines edge blurry, at this moment need to change scraper;
(7) ink wire mark is observed before dry ink, when wire mark is dried again through ultraviolet after disappearing;Time dry, adopting ultraviolet cold light lamp to carry out printing down under 35-45 DEG C of temperature environment, 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 ink adhesive force at stock printing surface.
Above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), oleum, concentrated nitric acid, the chromic acid solution of 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 ink adhesive force at stock printing surface.
In above-mentioned steps (4), the ethanol of cleaning stock adds antistatic agent.
The screen printing forme after being finished will be made to soak 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, the method for printing screen of the present invention, owing to concrete grammar step has been carried out breakthrough improvement by it, compared with prior art, it occurs when can be prevented effectively from actual printing that photoresists are loosely, scumming, ink colorant is uneven, loosely, ink logo deformation, has 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 technical scheme is explained further, it is described in detail below by specific embodiment.
A kind of method for printing screen of the present invention, embodiment one, comprise the steps:
null(1) when joining photoresists,By bisphenol A epoxide resin,Polyvinyl alcohol,Melamine modified phenolic resin,Dimethyl phthalate,Acrylic glycidyl ether,Sodium carboxymethyl cellulose,N-(the chloro-4-aminomethyl phenyl of 3-)-N,Trimethylolethane,Polyoxyethylene sorbitan monolaurate,Dimethyl methyl phosphonate,Anhydrous acetic acid,Sodium acetate,Ethanol,Water,Ammonium bichromate. 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 it is stirred 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 it is another with joining in other dispensing after the first preparation respectively of the water of 20 weight portions in Ammonium bichromate. and 280 weight portions,Aforementioned all water is the distilled water that temperature is 38 DEG C,This photoresists are strong with the adhesion of silk screen,There are excellent chemical resistance and rub resistance,Press resistance rate is high;Mesh clearly, is not blocked in cylinder platemaking development, can improve printing cylinder tensile property in printing process, improves the service life of silk screen, shortens time of exposure, improve the binding strength of glue-line and silk screen, and resistance to flushing fastness is strong, and resolution is high;Non-volatility organic compound in preparation process, the pollution of environment is little, human injury is low;
Then the photoresists prepared are placed 3 hours when 36 DEG C, treat that bubble therein is overflowed, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then it is placed in 35 DEG C of dustfree environments and dries, dried thickness is screen thickness the 6.5% of photosensitive layer, and the dried thickness of photosensitive layer is more than the roughness Rz value of silk screen, in coating process, the thickness controlling photosensitive layer and whole screen printing forme is very important, time blocked up, shadow level is inseparable, and high high light can not print;Half tone is rough, can cause the improper increase in site, tone variations, crosses Bao Shiyou it cannot be guaranteed that intensity and print request;
Being close on photosensitive layer by the positive image egative film that photograph is made, expose through daylight lamp or dysprosium lamp, the distance between photosensitive layer and lamp is 50cm, time of exposure 6 minutes;By the exposed photosensitive layer water development 1 minute with 0 DEG C, after pattern all presents, rinse with clear water immediately and dry, pattern development quality can be improved;
Choosing yellow plain weave polyester net, order number is 250 orders, and 2.5 times of the maximum ink particle diameter of Kong Changwei of grid, yellow-coloured polyester silk screen can reduce the diffuse-reflectance of exposure light during printing down, and exposure accuracy is higher, and the precision of ink logo edge line is higher;Use the phosphoric acid mixed liquor according to weight ratio 2:1:1 of phenol, cresol and mass fraction 35%, carry out processing 5 minutes to the ink surface of silk screen, then rinse out with clear water, such process and flushing process are repeatedly performed 2 times, with clear water, screen bath totally and is dried after process, this method is Physical cleaning silk screen, and operation is simple and cleaning effect good;Select concentrated cleaning, the two sides of silk screen is all smeared uniformly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, it is ensured that not having residual foam on silk screen, and avoid being touched by other object, especially finger does not touch silk screen;Successively with caustic alkali and abluent, silk screen is carried out cleaning by degreasing again, then rinse with clear water, and be dried;After cleaning in the environment of a free from dust dry silk screen, make air-flow flow uniformly through silk screen surface, and washed net the same day, the same day is coated with photoresists, and before being so possible to prevent gluing, silk screen falls upper dust again;
Aluminium alloy or steel screen frame, clean up the one side of screen frame with silk screen bonding, rub gently with fine sandpaper, make screen frame rough surface, is so prone to the bonding force improving screen frame with silk screen;Screen frame after cleaning before the net that stretches tight, first with the face precoating layer adhesive glue of mesh contacts drying;
Adopting craft or Stretching machine tiltedly to stretch tight net, the longitude and latitude netting twine of silk screen becomes 20 ° of angles with screen frame, advantageously reduces site incompleteness, makes small characters, lines more perfect;Stretch tight net time, initial tensile force is 15N/cm, the uniform tension in order of same set of half tone, drawing in the net once every 55 minutes later, measure half tone tension force by tonometer after 11 hours, making tension force is 24N/cm, and each several part tension difference is less than or equal to 1N/cm, make silk screen tension force more uniform;Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines;Making silk screen and screen frame be adjacent to after silk screen tension, and be coated adhesive glue in silk screen and screen frame contact portion, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applies pressure, makes more firm bonding with screen frame of silk screen;Glue to be bonded is dried, unclamps Stretching machine tensile force, cuts off the silk screen of surrounding outside screen frame, is then posted on, with one side adhesive sticker paper tape, the position that silk screen is bonding with screen frame;Silk screen is rinsed again, after silk screen dries, so that it may be coated with for photoresists with abluent and clear water;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of the silk screen that above-mentioned steps (1) is ultimately produced with photoresists aspect close and firm, are then dried, throw off soft substrate after drying.
(3) adopting Re-exposing method that screen printing forme carries out cure process, the re-expose time is 1 times of above-mentioned steps (1) time of exposure of middle first time;Printed patterns edge is neatly cut;Then 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 one layer of varnish protection space of a whole page of painting in non-inking part, it is ensured that pattern development quality improves further;
(4) keeping workshop cleaning, workshop temperature 24 DEG C, humidity is 21.8g/m3, this temperature matches with humidity, and close to saturation, suitable ink is brought into normal play characteristic, makes ink not easily in use become viscous gradually and the problem such as network blocking or scumming occurs;Print station is cleared up and flattens;The upper and lower surface of stock is carried out chemical treatment, flame treatment or electron bombardment, chemical treatment is coupling agent pretreatment concretely, then alcohol rub is adopted to clear up the upper and lower surface of stock, and printed when 1 minute, ink anchor effect on the substrate can be improved, strengthen adhesion;
nullInk adopts UV ink,By polyester acrylate resin during configuration UV ink,Aldehyde ketone resin,Lauric acid modified epoxy acrylate resin,Trihydroxy methyl propane triacrylate,Isopropyl thioxanthone,Three (N-nitroso-group-N-Phenylhydroxylamine) aluminium salt,Ink emulsion resistance auxiliary agent,Fumed silica,Terminal carboxyl polyester,Modified polyethylene wax powder,Nano-calcium carbonate,Aqueous 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,Through being ground to particle size less than 5 microns,The fineness of ink is less than 10 microns;With the hot water of appropriate 80 DEG C, with aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, ink is carried out mix and blend 20 minutes;The fluidity making ink is 30mm, and the viscosity of ink is 4000 centipoises, and this ink has adaptation, and print Environmental, resistance to is strong, stability of characteristics is reliable, pattern is uniform, smooth, smooth and easy, UV curing rate is fast, effective, and adhesive force is big, difficult drop-off, the advantages such as printing effect is good;Ink before use by filter screen filtration once, can filter ink skin and other various impurity;Described ink emulsion resistance auxiliary agent is that phenolic resin that phenolic resin that weight average molecular weight is 50000, weight average molecular weight are 1500, Semen Lini oil, organo-aluminium gel, lauric fatty acid isobutyl ester are carried out mix and blend according to weight ratio 22:7:34:3.5:28 and made;
Scraper adopts polyurethane rubber or Viton material, and hardness is HS80, and cutting edge pressure is at 10N/cm2, the speed of travel of scraper is at 200mm/s, and scraper and silk screen angulation are 45 °, keeps scraper to contact with web lines in printing process, and web lines is perpendicular with the scraper direction of motion;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as examination printing stock, through several examination printings, the strong oil suction performance of ink of available newsprint, letterpress paper or writing paper made from bamboo, remove the dust on screen printing forme and foreign body, it is to avoid pin-hole phenomena;
(6) formally print, abrasion along with scraper cutting edge, blade shape is circular arc, slurry is sharply increased towards the component in silk screen direction, and silk screen acts on the pressure of silk screen unit are and is obviously reduced, 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, easily there is seepage, simultaneously printing lines edge blurry, at this moment need to change scraper;
(7) ink wire mark is observed before dry ink, when wire mark is dried again through ultraviolet after disappearing;Time dry, adopting ultraviolet cold light lamp to carry out printing down under 35 DEG C of temperature environments, copying time is 3 minutes, and the distance between fluorescent tube and glass is 7cm, wire mark so can be made fully to flow spread apart, be prevented effectively from and retain wire mark after drying, affect printing quality.
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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), oleum, concentrated nitric acid, the chromic acid solution of 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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the nitric acid of the sulphuric 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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), weight potassium plumbite, sulphuric 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 ink adhesive force at stock printing surface.
Preferably, after finishing printing, using demoulding powder that photoresists are carried out demoulding, after demoulding completes, the dissolving that demoulding powder carries out 4 times with clear water is rinsed and pours out operation, it may be achieved the thoroughly demoulding.
Preferably, when dissolving demoulding powder, after the sulphuric acid of mass fraction 30% and water are mixed according to weight ratio 1:100, carry out demoulding powder dissolving and rinse.
Preferably, the screen printing forme after being finished will be made to soak 40 seconds in the sodium hydrate aqueous solution of temperature 80 DEG C, print material self falling, can thoroughly remove the impurity such as print material, it is achieved 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, affect normal inking, produce network blocking fault, the situation having a strong impact on printing quality can be held etc. by silk screen in the moment of stock output and occur.In above-mentioned steps (4), the ethanol of cleaning stock adds 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 22 °.
Embodiment two, comprises the steps:
null(1) when joining glue,By bisphenol A epoxide resin,Polyvinyl alcohol,Melamine modified phenolic resin,Dimethyl phthalate,Acrylic glycidyl ether,Sodium carboxymethyl cellulose,N-(the chloro-4-aminomethyl phenyl of 3-)-N,Trimethylolethane,Polyoxyethylene sorbitan monolaurate,Dimethyl methyl phosphonate,Anhydrous acetic acid,Sodium acetate,Ethanol,Water,Ammonium bichromate. 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 it is stirred 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 it is another with joining in other dispensing after the first preparation respectively of the water of 21 weight portions in Ammonium bichromate. and 260 weight portions,Aforementioned all water is the distilled water that temperature is 20 DEG C,This photoresists are strong with the adhesion of silk screen,There are excellent chemical resistance and rub resistance,Press resistance rate is high;Mesh clearly, is not blocked in cylinder platemaking development, can improve printing cylinder tensile property in printing process, improves the service life of silk screen, shortens time of exposure, improve the binding strength of glue-line and silk screen, and resistance to flushing fastness is strong, and resolution is high;Non-volatility organic compound in preparation process, the pollution of environment is little, human injury is low;
Then the photoresists prepared are placed 4 hours when 25 DEG C, treat that bubble therein is overflowed, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then it is placed in 40 DEG C of dustfree environments and dries, dried thickness is screen thickness the 8% of photosensitive layer, and the dried thickness of photosensitive layer is more than the roughness Rz value of silk screen, in coating process, the thickness controlling photosensitive layer and whole screen printing forme is very important, time blocked up, shadow level is inseparable, and high high light can not print;Half tone is rough, can cause the improper increase in site, tone variations, crosses Bao Shiyou it cannot be guaranteed that intensity and print request;
Being close on the silk screen of coated photoresists by the positive image egative film that photograph is made, expose through daylight lamp or dysprosium lamp, the distance between photosensitive layer and lamp is 55cm, time of exposure 7 minutes;By the exposed screen printing forme water development 1.5 minutes with 20 DEG C, after pattern all presents, rinse with clear water immediately and dry, pattern development quality can be improved;
Choosing yellow plain weave polyester net, order number is 265 orders, and 3.75 times of the maximum ink particle diameter of Kong Changwei of grid, yellow-coloured polyester silk screen can reduce the diffuse-reflectance of exposure light during printing down, and exposure accuracy is higher, and the precision of ink logo edge line is higher;Use the phosphoric acid mixed liquor according to weight ratio 2:1:1 of phenol, cresol and mass fraction 40%, carry out processing 5.5 minutes to the ink surface of silk screen, then rinse out with clear water, such process and flushing process are repeatedly performed 2 times, with clear water, screen bath totally and is dried after process, this method is chemical method cleaning silk screen, and operation is simple and cleaning effect good;Select concentrated cleaning, the two sides of silk screen is all smeared uniformly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, it is ensured that not having residual foam on silk screen, and avoid being touched by other object, especially finger does not touch silk screen;Successively with caustic alkali and abluent, silk screen is carried out cleaning by degreasing again, then rinse with clear water, and be dried;After cleaning in the environment of a free from dust dry silk screen, make air-flow flow uniformly through silk screen surface, and washed net the same day, the same day is coated with photoresists, and before being so possible to prevent gluing, silk screen falls upper dust again;
Aluminium alloy or steel screen frame, clean up the one side of screen frame with silk screen bonding, rub gently with fine sandpaper, make screen frame rough surface, is so prone to the bonding force improving screen frame with silk screen;Screen frame after cleaning before the net that stretches tight, first with the face precoating layer adhesive glue of mesh contacts drying;
Adopting craft or Stretching machine tiltedly to stretch tight net, the longitude and latitude netting twine of silk screen becomes 27.5 ° of angles with screen frame, advantageously reduces site incompleteness, makes small characters, lines more perfect;Stretch tight net time, initial tensile force is 16.5N/cm, the uniform tension in order of same set of half tone, drawing in the net once every 60 minutes later, measure half tone tension force by tonometer after 12 hours, making tension force is 24.5N/cm, and each several part tension difference is less than or equal to 1N/cm, make silk screen tension force more uniform;Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines;Making silk screen and screen frame be adjacent to after silk screen tension, and be coated adhesive glue in silk screen and screen frame contact portion, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applies pressure, makes more firm bonding with screen frame of silk screen;Glue to be bonded is dried, unclamps Stretching machine tensile force, cuts off the silk screen of surrounding outside screen frame, is then posted on, with one side adhesive sticker paper tape, the position that silk screen is bonding with screen frame;Silk screen is rinsed again, after silk screen dries, so that it may be coated with for photoresists with abluent and clear water;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of the silk screen that above-mentioned steps (1) is ultimately produced with photoresists aspect close and firm, are then dried, throw off soft substrate after drying.
(3) adopting Re-exposing method that screen printing forme carries out cure process, the re-expose time is 2 times of above-mentioned steps (1) time of exposure of middle first time;Printed patterns edge is neatly cut;Then 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 one layer of varnish protection space of a whole page of painting in non-inking part, it is ensured that pattern development quality improves further;
(4) keeping workshop cleaning, workshop temperature 25 DEG C, humidity is 23g/m3, this temperature matches with humidity, and close to saturation, suitable ink is brought into normal play characteristic, makes ink not easily in use become viscous gradually and the problem such as network blocking or scumming occurs;Print station is cleared up and flattens;The upper and lower surface of stock is carried out chemical treatment, flame treatment or electron bombardment, chemical treatment is coupling agent pretreatment concretely, then alcohol rub is adopted to clear up the upper and lower surface of stock, and printed when 5 minutes, ink anchor effect on the substrate can be improved, strengthen adhesion;
nullInk adopts UV ink,By polyester acrylate resin during configuration UV ink,Aldehyde ketone resin,Lauric acid modified epoxy acrylate resin,Trihydroxy methyl propane triacrylate,Isopropyl thioxanthone,Three (N-nitroso-group-N-Phenylhydroxylamine) aluminium salt,Ink emulsion resistance auxiliary agent,Fumed silica,Terminal carboxyl polyester,Modified polyethylene wax powder,Nano-calcium carbonate,Aqueous 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,Through being ground to particle size less than 5 microns,The fineness of ink is less than 10 microns;With the hot water of appropriate 85 DEG C, with aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, ink is carried out mix and blend 30 minutes;The fluidity making ink is 40mm, and the viscosity of ink is 10000 centipoises, and this ink has adaptation, and print Environmental, resistance to is strong, stability of characteristics is reliable, pattern is uniform, smooth, smooth and easy, UV curing rate is fast, effective, and adhesive force is big, difficult drop-off, the advantages such as printing effect is good;Ink uses filter screen filtration twice before use, can filter ink skin and other various impurity;Described ink emulsion resistance auxiliary agent is that phenolic resin that phenolic resin that weight average molecular weight is 100000, weight average molecular weight are 2500, Semen Lini oil, organo-aluminium gel, lauric fatty acid isobutyl ester are carried out mix and blend according to weight ratio 23:5:36:2.5:30 and made;
Scraper adopts polyurethane rubber or Viton material, and hardness is HS85, and cutting edge pressure is at 12N/cm2, the speed of travel of scraper is at 220mm/s, and scraper and silk screen angulation are 60 °, keeps scraper to contact with web lines in printing process, and web lines is perpendicular with the scraper direction of motion;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as examination printing stock, through several examination printings, the strong oil suction performance of ink of available newsprint, letterpress paper or writing paper made from bamboo, remove the dust on screen printing forme and foreign body, it is to avoid pin-hole phenomena;
(6) formally print, abrasion along with scraper cutting edge, blade shape is circular arc, slurry is sharply increased towards the component in silk screen direction, and silk screen acts on the pressure of silk screen unit are and is obviously reduced, 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, easily there is seepage, simultaneously printing lines edge blurry, at this moment need to change scraper;
(7) ink wire mark is observed before dry ink, when wire mark is dried again through ultraviolet after disappearing;Time dry, adopting ultraviolet cold light lamp to carry out printing down under 40 DEG C of temperature environments, copying time is 4.5 minutes, and the distance between fluorescent tube and glass is 8cm, wire mark so can be made fully to flow spread apart, be prevented effectively from and retain wire mark after drying, affect printing quality.
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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), oleum, concentrated nitric acid, the chromic acid solution of 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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the nitric acid of the sulphuric 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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), weight potassium plumbite, sulphuric 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 ink adhesive force at stock printing surface.
Preferably, after finishing printing, using demoulding powder that photoresists are carried out demoulding, after demoulding completes, the dissolving that demoulding powder carries out 6 times with clear water is rinsed and pours out operation, it may be achieved the thoroughly demoulding.
Preferably, when dissolving demoulding powder, after the sulphuric acid of mass fraction 35% and water are mixed according to weight ratio 3:100, carry out demoulding powder dissolving and rinse.
Preferably, the screen printing forme after being finished will be made to soak 50 seconds in the sodium hydrate aqueous solution of temperature 82 DEG C, print material self falling, can thoroughly remove the impurity such as print material, it is achieved 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, affect normal inking, produce network blocking fault, the situation having a strong impact on printing quality can be held etc. by silk screen in the moment of stock output and occur.In above-mentioned steps (4), the ethanol of cleaning stock adds 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 23.5 °.
Embodiment three, comprises the steps:
null(1) when joining glue,By bisphenol A epoxide resin,Polyvinyl alcohol,Melamine modified phenolic resin,Dimethyl phthalate,Acrylic glycidyl ether,Sodium carboxymethyl cellulose,N-(the chloro-4-aminomethyl phenyl of 3-)-N,Trimethylolethane,Polyoxyethylene sorbitan monolaurate,Dimethyl methyl phosphonate,Anhydrous acetic acid,Sodium acetate,Ethanol,Water,Ammonium bichromate. 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 it is stirred 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 it is another with joining in other dispensing after the first preparation respectively of the water of 22 weight portions in Ammonium bichromate. and 240 weight portions,Aforementioned all water is the distilled water that temperature is 10 DEG C,This photoresists are strong with the adhesion of silk screen,There are excellent chemical resistance and rub resistance,Press resistance rate is high;Mesh clearly, is not blocked in cylinder platemaking development, can improve printing cylinder tensile property in printing process, improves the service life of silk screen, shortens time of exposure, improve the binding strength of glue-line and silk screen, and resistance to flushing fastness is strong, and resolution is high;Non-volatility organic compound in preparation process, the pollution of environment is little, human injury is low;
Then the photoresists prepared are placed 5 hours when 15 DEG C, treat that bubble therein is overflowed, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then it is placed in 45 DEG C of dustfree environments and dries, dried thickness is screen thickness the 9% of photosensitive layer, and the dried thickness of photosensitive layer is more than the roughness Rz value of silk screen, in coating process, the thickness controlling photosensitive layer and whole screen printing forme is very important, time blocked up, shadow level is inseparable, and high high light can not print;Half tone is rough, can cause the improper increase in site, tone variations, crosses Bao Shiyou it cannot be guaranteed that intensity and print request;
Being close on the silk screen of coated photoresists by the positive image egative film that photograph is made, expose through daylight lamp or dysprosium lamp, the distance between photosensitive layer and lamp is 60cm, time of exposure 8 minutes;By the exposed screen printing forme water development 2 minutes with 35 DEG C, after pattern all presents, rinse with clear water immediately and dry, pattern development quality can be improved;
Choosing yellow plain weave polyester net, order number is 280 orders, and 5 times of the maximum ink particle diameter of Kong Changwei of grid, yellow-coloured polyester silk screen can reduce the diffuse-reflectance of exposure light during printing down, and exposure accuracy is higher, and the precision of ink logo edge line is higher;Use the phosphoric acid mixed liquor according to weight ratio 2:1:1 of phenol, cresol and mass fraction 45%, carry out processing 6 minutes to the ink surface of silk screen, then rinse out with clear water, such process and flushing process are repeatedly performed 3 times, with clear water, screen bath totally and is dried after process, this method is chemical method cleaning silk screen, and operation is simple and cleaning effect good;Select concentrated cleaning, the two sides of silk screen is all smeared uniformly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, it is ensured that not having residual foam on silk screen, and avoid being touched by other object, especially finger does not touch silk screen;Successively with caustic alkali and abluent, silk screen is carried out cleaning by degreasing again, then rinse with clear water, and be dried;After cleaning in the environment of a free from dust dry silk screen, make air-flow flow uniformly through silk screen surface, and washed net the same day, the same day is coated with photoresists, and before being so possible to prevent gluing, silk screen falls upper dust again;
Aluminium alloy or steel screen frame, clean up the one side of screen frame with silk screen bonding, rub gently with fine sandpaper, make screen frame rough surface, is so prone to the bonding force improving screen frame with silk screen;Screen frame after cleaning before the net that stretches tight, first with the face precoating layer adhesive glue of mesh contacts drying;
Adopting craft or Stretching machine tiltedly to stretch tight net, the longitude and latitude netting twine of silk screen becomes 35 ° of angles with screen frame, advantageously reduces site incompleteness, makes small characters, lines more perfect;Stretch tight net time, initial tensile force is 18N/cm, the uniform tension in order of same set of half tone, drawing in the net once every 65 minutes later, measure half tone tension force by tonometer after 13 hours, making tension force is 25N/cm, and each several part tension difference is less than or equal to 1N/cm, make silk screen tension force more uniform;Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines;Making silk screen and screen frame be adjacent to after silk screen tension, and be coated adhesive glue in silk screen and screen frame contact portion, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applies pressure, makes more firm bonding with screen frame of silk screen;Glue to be bonded is dried, unclamps Stretching machine tensile force, cuts off the silk screen of surrounding outside screen frame, is then posted on, with one side adhesive sticker paper tape, the position that silk screen is bonding with screen frame;Silk screen is rinsed again, after silk screen dries, so that it may be coated with for photoresists with abluent and clear water;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of the silk screen that above-mentioned steps (1) is ultimately produced with photoresists aspect close and firm, are then dried, throw off soft substrate after drying.
(3) adopting Re-exposing method that screen printing forme carries out cure process, the re-expose time is 3 times of above-mentioned steps (1) time of exposure of middle first time;Printed patterns edge is neatly cut;Then 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 one layer of varnish protection space of a whole page of painting in non-inking part, it is ensured that pattern development quality improves further;
(4) keeping workshop cleaning, workshop temperature 26 DEG C, humidity is 24.4g/m3, this temperature matches with humidity, and close to saturation, suitable ink is brought into normal play characteristic, makes ink not easily in use become viscous gradually and the problem such as network blocking or scumming occurs;Print station is cleared up and flattens;The upper and lower surface of stock is carried out chemical treatment, flame treatment or electron bombardment, chemical treatment is coupling agent pretreatment concretely, then alcohol rub is adopted to clear up the upper and lower surface of stock, and printed when 8 minutes, ink anchor effect on the substrate can be improved, strengthen adhesion;
nullInk adopts UV ink,By polyester acrylate resin during configuration UV ink,Aldehyde ketone resin,Lauric acid modified epoxy acrylate resin,Trihydroxy methyl propane triacrylate,Isopropyl thioxanthone,Three (N-nitroso-group-N-Phenylhydroxylamine) aluminium salt,Ink emulsion resistance auxiliary agent,Fumed silica,Terminal carboxyl polyester,Modified polyethylene wax powder,Nano-calcium carbonate,Aqueous 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,Through being ground to particle size less than 5 microns,The fineness of ink is less than 10 microns;With the hot water of appropriate 90 DEG C, with aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, ink is carried out mix and blend 40 minutes;The fluidity making ink is 50mm, and the viscosity of ink is 12000 centipoises, and this ink has adaptation, and print Environmental, resistance to is strong, stability of characteristics is reliable, pattern is uniform, smooth, smooth and easy, UV curing rate is fast, effective, and adhesive force is big, difficult drop-off, the advantages such as printing effect is good;Ink uses filter screen filtration three times before use, can filter ink skin and other various impurity;Described ink emulsion resistance auxiliary agent is that phenolic resin that phenolic resin that weight average molecular weight is 150000, weight average molecular weight are 4000, Semen Lini oil, organo-aluminium gel, lauric fatty acid isobutyl ester are carried out mix and blend according to weight ratio 25:4:38:1.5:33 and made;
Scraper adopts polyurethane rubber or Viton material, and hardness is HS90, and cutting edge pressure is at 15N/cm2, the speed of travel of scraper is at 250mm/s, and scraper and silk screen angulation are 75 °, keeps scraper to contact with web lines in printing process, and web lines is perpendicular with the scraper direction of motion;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as examination printing stock, through several examination printings, the strong oil suction performance of ink of available newsprint, letterpress paper or writing paper made from bamboo, remove the dust on screen printing forme and foreign body, it is to avoid pin-hole phenomena;
(6) formally print, abrasion along with scraper cutting edge, blade shape is circular arc, slurry is sharply increased towards the component in silk screen direction, and silk screen acts on the pressure of silk screen unit are and is obviously reduced, 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, easily there is seepage, simultaneously printing lines edge blurry, at this moment need to change scraper;
(7) ink wire mark is observed before dry ink, when wire mark is dried again through ultraviolet after disappearing;Time dry, adopting ultraviolet cold light lamp to carry out printing down under 45 DEG C of temperature environments, copying time is 6 minutes, and the distance between fluorescent tube and glass is 10cm, wire mark so can be made fully to flow spread apart, be prevented effectively from and retain wire mark after drying, affect printing quality.
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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), oleum, concentrated nitric acid, the chromic acid solution of 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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), the nitric acid of the sulphuric 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 ink adhesive force at stock printing surface.
Preferably, above-mentioned stock is polyethylene plastic film, in above-mentioned steps (4), weight potassium plumbite, sulphuric 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 ink adhesive force at stock printing surface.
Preferably, after finishing printing, using demoulding powder that photoresists are carried out demoulding, after demoulding completes, the dissolving that demoulding powder carries out 5 times with clear water is rinsed and pours out operation, it may be achieved the thoroughly demoulding.
Preferably, when dissolving demoulding powder, after the sulphuric acid of mass fraction 40% and water are mixed according to weight ratio 5:100, carry out demoulding powder dissolving and rinse.
Preferably, the screen printing forme after being finished will be made to soak 50 seconds in the sodium hydrate aqueous solution of temperature 85 DEG C, print material self falling, can thoroughly remove the impurity such as print material, it is achieved 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, affect normal inking, produce network blocking fault, the situation having a strong impact on printing quality can be held etc. by silk screen in the moment of stock output and occur.In above-mentioned steps (4), the ethanol of cleaning stock adds 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 25 °.
The silk-screen printing technique of the present invention, wherein each composition parameter and concrete technology mode of operation all can be adjusted according to actual requirement and design.
The process form of the present invention is not limited to this case embodiment, and it is carried out the suitably change of similar thinking or modifies by anyone, all should be regarded as the patent category without departing from the present invention.

Claims (6)

1. a method for printing screen, it is characterised in that comprise the steps:
null(1) when joining photoresists,By bisphenol A epoxide resin,Polyvinyl alcohol,Melamine modified phenolic resin,Dimethyl phthalate,Acrylic glycidyl ether,Sodium carboxymethyl cellulose,N-(the chloro-4-aminomethyl phenyl of 3-)-N,Trimethylolethane,Polyoxyethylene sorbitan monolaurate,Dimethyl methyl phosphonate,Anhydrous acetic acid,Sodium acetate,Ethanol,Water,Ammonium bichromate. 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 it is stirred 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 it is another with joining in other dispensing after the first preparation respectively of the water of the 20-22 weight portion in Ammonium bichromate. and 240-280 weight portion,Aforementioned all water is the distilled water that temperature is less than 38 DEG C;
Then the photoresists prepared are placed 3-5 hour lower than 38 DEG C when, treat that bubble therein is overflowed, then photoresists are coated on repeatedly on soft substrate and form photosensitive layer, then it is placed in 35-45 DEG C of dustfree environment and dries, the 6.5-9% that dried thickness is screen thickness of photosensitive layer, and the dried thickness of photosensitive layer is more than the roughness Rz value of silk screen;
Being close on photosensitive layer by the positive image egative film that photograph is made, expose through daylight lamp or dysprosium lamp, the distance between photosensitive layer and lamp is 50-60cm, time of exposure 6-8 minute;By water development 1-2 minute of exposed photosensitive layer 0-35 DEG C, after pattern all presents, rinse with clear water immediately and dry;
Choosing yellow plain weave polyester net, order number is 250-280 order, 2.5-5 times of the maximum ink particle diameter of Kong Changwei of grid;Use the phosphoric acid mixed liquor according to weight ratio 2:1:1 of phenol, cresol and mass fraction 35-45%, carry out processing 5-6 minute to the ink surface of silk screen, then rinsing out with clear water, such process and flushing process are repeatedly performed 2-3 time, totally and are dried by screen bath with clear water after process;Select concentrated cleaning, the two sides of silk screen is all smeared uniformly, and with sponge wiping repeatedly, then with water, silk screen is rinsed well, it is ensured that silk screen does not have residual foam, and avoids being touched by other object;Successively with caustic alkali and abluent, silk screen is carried out cleaning by degreasing again, then rinse with clear water, and be dried;Drying silk screen after cleaning in the environment of a free from dust, make air-flow flow uniformly through silk screen surface, and washed net the same day, the same day is coated with photoresists;
Aluminium alloy or steel screen frame, clean up the one side of screen frame with silk screen bonding, rub gently with fine sandpaper, make screen frame rough surface;Screen frame after cleaning before the net that stretches tight, first with the face precoating layer adhesive glue of mesh contacts drying;
Adopting craft or Stretching machine tiltedly to stretch tight net, 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 15-18N/cm, and the uniform tension in order of same set of half tone was drawn in the net once every 55-65 minute later, after 11-13 hour with tonometer measure half tone tension force, making tension force is 24-25N/cm, and each several part tension difference is less than or equal to 1N/cm;Ensure that screen printing forme surfacing is smooth, the neat in edge of screen printing forme lines;Making silk screen and screen frame be adjacent to after silk screen tension, and be coated adhesive glue in silk screen and screen frame contact portion, then dry up, when drying up, with rubber slab or soft cloth, limit wiping bonding portion, limit applies pressure, makes more firm bonding with screen frame of silk screen;Glue to be bonded is dried, unclamps Stretching machine tensile force, cuts off the silk screen of surrounding outside screen frame, is then posted on, with one side adhesive sticker paper tape, the position that silk screen is bonding with screen frame;Silk screen is rinsed again, after silk screen dries, so that it may be coated with for photoresists with abluent and clear water;
(2) above-mentioned soft substrate and photosensitive layer are fitted in the ink surface of the silk screen that above-mentioned steps (1) is ultimately produced with photoresists aspect close and firm, are then dried, throw off soft substrate after drying;
(3) adopting Re-exposing method that screen printing forme carries out cure process, the re-expose time is 1-3 times of above-mentioned steps (1) time of exposure of middle first time;Printed patterns edge is neatly cut;Then 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 one layer of varnish protection space of a whole page of painting in non-inking part;
(4) keeping workshop cleaning, temperature 24-26 DEG C of workshop, humidity is 21.8-24.4g/m3;Print station is cleared up and flattens;The upper and lower surface of stock is carried out chemical treatment, flame treatment or electron bombardment, then adopts alcohol rub to clear up the upper and lower surface of stock, and printed in 1-8 minute;
nullInk adopts UV ink,By polyester acrylate resin during configuration UV ink,Aldehyde ketone resin,Lauric acid modified epoxy acrylate resin,Trihydroxy methyl propane triacrylate,Isopropyl thioxanthone,Three (N-nitroso-group-N-Phenylhydroxylamine) aluminium salt,Ink emulsion resistance auxiliary agent,Fumed silica,Terminal carboxyl polyester,Modified polyethylene wax powder,Nano-calcium carbonate,Aqueous 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,Through being ground to particle size less than 5 microns,The fineness of ink is less than 10 microns;With appropriate more than 80 DEG C hot water, with aromatic hydrocarbons, ketenes, ester, ethanol or glycol ether, ink is carried out mix and blend 20-40 minute;The fluidity making ink is 30-50mm, and the viscosity of ink is 4000-12000 centipoise;Ink is before use by filter screen filtration at least one times;Described ink emulsion resistance auxiliary agent is that weight average molecular weight to be the phenolic resin of 50000-150000, weight average molecular weight the be phenolic resin of 1500-4000, Semen Lini oil, organo-aluminium gel, lauric fatty acid isobutyl ester are carried out mix and blend according to weight ratio 22-25:4-7:34-38:1.5-3.5:28-33 and made;
Scraper adopts polyurethane rubber or Viton material, and hardness is HS80-90, and cutting edge pressure is at 10-15N/cm2, the speed of travel of scraper is at 200-250mm/s, and scraper and silk screen angulation are 45-75 °, keeps scraper to contact with web lines in printing process, and web lines is perpendicular with the scraper direction of motion;
(5) before formal printing, adopt newsprint, letterpress paper or writing paper made from bamboo as examination printing stock, through several examination printings, remove the dust on screen printing forme and foreign body, it is to avoid pin-hole phenomena;
(6) formally print, abrasion along with scraper cutting edge, blade shape is circular arc, slurry is sharply increased towards the component in silk screen direction, and silk screen acts on the pressure of silk screen unit are and is obviously reduced, 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, easily there is seepage, simultaneously printing lines edge blurry, at this moment need to change scraper;
(7) ink wire mark is observed before dry ink, when wire mark is dried again through ultraviolet after disappearing;Time dry, adopting ultraviolet cold light lamp to carry out printing down under 35-45 DEG C of temperature environment, 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 ink adhesive force 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), oleum, concentrated nitric acid, the chromic acid solution of 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 ink adhesive force at stock printing surface.
4. a kind of method for printing screen according to claim 1, it is characterised in that: in above-mentioned steps (4), the ethanol of cleaning stock adds antistatic agent.
5. a kind of method for printing screen according to claim 1, it is characterised in that: the screen printing forme after being finished will be made to soak 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, it is characterised 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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