CN104553405A - UV (ultraviolet) coating process for tinplate food cans - Google Patents
UV (ultraviolet) coating process for tinplate food cans Download PDFInfo
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- CN104553405A CN104553405A CN201310504660.9A CN201310504660A CN104553405A CN 104553405 A CN104553405 A CN 104553405A CN 201310504660 A CN201310504660 A CN 201310504660A CN 104553405 A CN104553405 A CN 104553405A
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Abstract
The invention provides a UV (ultraviolet) coating process for tinplate food cans. The process includes 1, producing a pre-printing file; 2, directly making a plate offline; 3, performing inner coating; 4, performing outer coating; 5, performing six-color UV printing; 6, allowing solidifying; and 7, performing polishing. The process has the advantages that the quality defect, shedding of ink at weld edge, caused by printing pressure can be decreased, and product quality is further improved; by the use of dot percentage in place of solid printing, usage of the ink is greatly decreased, product manufacturing cost is reduced, and energy saving and environment protection are achieved.
Description
Technical field
The present invention relates to a kind of tin plate printing technology, for food pot typography, particularly, relate to a kind of UV for tin plate food pot and print painting technique.
Background technology
The UV typography of traditional tin plate food pot product, color is by Huang, skin, specially red, blue, specially red, black six colors composition, six look iron-printing machine one-step prints are adopted to complete, wherein, dominant hue (specially red) mainly by two groups specially red on the spot superpose printing form, because iron-printing product layer of ink is thicker, the color that should have the degree of depth just can be reached by superposing printing on the spot, but often in printing process, because squeegee pressure is difficult to control, thicker two on the spot ink layer mutually superpose printing, under the effect of squeegee pressure, ink can be sprawled to margin region, heap pressure, ink is caused to be piled up on edge weld, because weld edge does not have coating bottoming, UV ink adhesive force on plain sheet is poor, easily fall ink, have impact on the quality of product to a certain extent.
Traditional plate-making mode is mainly by the film or Ctcp plate-making flow process, and plate-making efficiency is low, can not test effectively and timely, and plate-making precision is not high, not high with UV press printing process matching degree at a high speed, have impact on the quality of product to a certain extent.
Gloss oil mainly utilizes the mode of roller coat to be applied to color printing iron surface by traditional glazing coating on coating machine, and (tank welding region processed) place of directly leaving a blank does not have gloss oil to cover, and all the other places have gloss oil to protect a kind of coating method.
Summary of the invention
The object of the present invention is to provide a kind of UV for tin plate food pot to print and be coated with technique, described technique can reduce mass defect-weld edge ink that the effect because of squeegee pressure causes and come off, optimize product quality further, simultaneously, dot percentage is adopted to substitute field printing, significantly can reduce the consumption of ink, reduce cost of goods manufactured, reach the object of energy-conserving and environment-protective.
For achieving the above object, the present invention mainly adopts following technical scheme:
UV print for tin plate food pot is coated with a technique, comprises the steps:
1) prepress file makes, plate-making software professional before selecting print, and to product documentation dominant hue part on the spot, select circular shaped lattice point, angle of halftone screen line is 45 degree, replaces by the dot percentage of 90% ~ 95%, forms bitmap file;
2) off line is directly made a plate, and is uploaded to by the bitmap file of formation on computer master making machine, temperature-sensitive sheet material carries out expose, printing down, copying time 2 ~ 3 minutes;
3) be coated with in, select the inside courtyard of epoxy amino or epoxy novolac to be coated with at tinplate inner surface, be coated with thickness amount 5g/m
2~ 6g/m
2, coating speed 80 ~ 90 ms/min, solidification temperature 195 DEG C ~ 205 DEG C, 10 ~ 15 minutes hardening times;
4) be coated with outward, select the rustproof lacquer of polyester type or acrylic resin type to be coated with at the outer surface of tinplate, film amount 10g/m
2~ 12g/m
2, coating speed 80 ~ 90 ms/min, solidification temperature 175 DEG C ~ 185 DEG C, 12 ~ 15 minutes hardening times;
5) six look UV print, the PS version that solarization makes is installed on each print couple of printing machine, process color sequence is yellow, the colour of skin, specially red, blue, special red, black, and specially red is the dominant hue of tin plate food pot, and multicolored sequence is specially red is 90% ~ 95% dot percentage; (described multicolored sequence specially red dot percentage identical with the dot percentage value in step 1))
6) solidify, select UV lamp group to solidify continuously, UV lamp power 160w/cm ~ 200w/cm, power 100% of turning on light, guarantees ink solidification;
7) glazing, selects the acrylic acid of digestion resistant or vinyl gloss oil anyhow to leave a blank glazing, simulates white face and is coated with, carry out oil polish, gloss oil coated film amount 6g/m in printing figure message region
2~ 7g/m
2, coating speed 80 ~ 90 ms/min, solidification temperature 185 DEG C ~ 195 DEG C, 12 ~ 15 minutes hardening times, the print completing described tin plate food pot is coated with.
Wherein, the rustproof lacquer of polyester type or acrylic resin type is the good rustproof lacquer of digestion resistant, processing characteristics.
Further, in described step 5), printing multicolored sequence special red time, UV lamp power is 160w/cm ~ 200w/cm, power 75% ~ 100% of turning on light, when printing other color look sequences, close UV lamp, the color density value (ink film thickness) of two groups of special red sequences after double exposure is 2.10 ~ 2.20g/m
2.
In step 6), the UV lamp quantity in described UV lamp group is 4.
Compared with prior art, beneficial effect of the present invention is:
1) in existing tin graphed sheet process, often the layer of ink of product is comparatively abundant, the field printing that quantity of ink is larger, often occurs the printing issues that water great Mo is large, and ink emulsification is serious, unstable product quality, and ink waste is severe.And UV print provided by the present invention is coated with technique, except can ensureing the attractive in appearance of tin plate food pot product external packaging and serviceability, by in product dominant hue on the spot part dot percentage substitute, printing, utilize the principle of dot gain in lithographic printing, dot percentage is printed as effect on the spot, the site of 90% ~ 95% is under the effect of squeegee pressure, can 100% be increased to after printing, dominant hue (namely multicolored sequence is specially red) in tin plate food pot product is printed as on the spot the effect of (namely dot percentage is 100%) by 90% ~ 95% dot percentage, thus mass defect-weld edge ink that the effect because of squeegee pressure causes can be reduced come off, optimize product quality further, simultaneously, dot percentage is adopted to substitute field printing, under the prerequisite ensureing product appearance and serviceability, significantly reduce the consumption of ink, to reach minimizing cost of goods manufactured, reach the object of energy-conserving and environment-protective.
2) selected in the alternative Process of site circular shaped lattice point, compare the site of other shapes, circular shaped lattice point flare factor is less, under normal circumstances, circular shaped lattice point becomes circular arc to be connected in 78% area occupation ratio place surrounding, after circular shaped lattice point is connected with circular shaped lattice point (mutually overlapping), its flare factor will become very high, thus site, shadow region quantity of ink is excessive and pile up to periphery when causing printing, image shadow part is finally made to lose due level, and tin plate food pot provided by the present invention is just by circular shaped lattice point weak point in paper printing, the principle utilizing circular shaped lattice point mutually to overlap in site, shadow region to cause density to be jumped iron-printing product on the spot in application, under the effect of squeegee pressure, unnecessary ink can be sprawled to site white space, increase layer of ink levelability and glossiness, reach the surface effect of field printing, also avoid excess ink to the expansion of weld edge, optimize product quality, simultaneously, also the consumption of ink is significantly reduced, cost-saving.
3) advanced person is printed front CTP(and off line is directly made a plate by the present invention) system and high-fidelity UV print and organically combine, directly PS version is used to printing from image, text and data file, the whole plate-making time is only 2 ~ 3 minutes, eliminate out the complicated procedures (the former plate-making time is 30 minutes) of the film and Ctcp printing down, simplify operational sequence, increase work efficiency, decrease the dot loss in traditional printing down process, dot reproduction ability is enhanced.File flexibility is strong, is convenient to revise real-time.More to fit UV printing performance fast.
4) in upper photoreduction process of the present invention; glazing rubber roll has the rubber roll of anyhow leaving a blank to be coated with through laser engraving; gloss oil only covers on each mould of iron sheet; protection color printing face is not damaged; traverse furrow and straight flute place do not have gloss oil to cover; thus save the consumption of anyhow leave a blank place's gloss oil and combustion gas, save production cost, reach the object of energy-saving and emission-reduction.
5) the mental package milk tank product of present invention process UV printing is adopted, field printing is substituted by using dot percentage (being preferably 95% dot percentage), the UV ink usage of 3% ~ 5% can be saved, decrease the pollution to airborne release waste gas, in addition, by adopting advanced glazing process of anyhow leaving a blank, the consumption of gloss oil has greatly been saved, reduce the cost such as combustion gas, electric power, fully meet national energy-saving, environmental protection, resource-effective policy.
Accompanying drawing explanation
Fig. 1 is the structural representation of 95% dot percentage in the present invention.
Detailed description of the invention
Below by specific embodiment, the present invention is described further, should be clear and definite, and embodiment only for the description to preferred embodiment of the present invention, does not limit the scope of the invention.
The special red color of the multicolored sequence of Product Process of the present invention is printed by (i.e. 100% dot percentage) on the spot of the prior art and changes 90% ~ 95%(preferably 95% into) site ratio UV prints, utilize offset lithography dot gain principle, under squeegee pressure effect, 90% ~ 95% dot area is printed as the region on the spot of 100% site, reach the object of saving ink and improving the quality of products, wherein, 90% ~ 95% described dot percentage, as shown in Figure 1, 1 is circular shaped lattice point region, angle of halftone screen line is 45 degree, 2(and white round dot region) be blank parts, in offset lithography process, the areas inking of dot area, blank parts not inking, the immiscible principle of profit is utilized to complete printing.
Be described further below by specific embodiment:
To adopt a kind of UV for tin plate food pot of the present invention to print the milk tank being coated with explained hereafter food cans 145ml, tinplate hardness is T4, and tin coating weight is 1.1/1.1g/m
2, namely the tin coating weight of tinplate positive and negative is 1.1g/m
2, tinplate specification is 0.19mm*824mm*997mm, and it comprises the steps:
Embodiment 1
1) prepress file makes, plate-making software professional before selecting print, and to product documentation dominant hue part on the spot, select a kind of UV to print more stable circular shaped lattice point, angle of halftone screen line is 45 degree, replaces according to the dot percentage of 95%, forms bitmap file;
2) CTP directly makes a plate, and is uploaded to by the bitmap file of formation on computer master making machine, the Thermal sensitive plate that CTP is special carries out expose, printing down, copying time 3 minutes;
3) be coated with in, select the inside courtyard of epoxy amino to be coated with at tinplate inner surface, film amount 5.5g/m
2, coating speed 85 ms/min, solidification temperature 200 DEG C, 12 minutes hardening times;
4) be coated with outward, select the rustproof lacquer of the good polyester type of digestion resistant, processing characteristics to be coated with at the outer surface of tinplate, white face is coated with area size and will controls proper, too large, when printing, leakiness white edge, too little, easily causes the bad problem that comes off of ink adhesion when printing.Film amount 11g/m
2, coating speed 85 ms/min, solidification temperature 180 DEG C, 12 minutes hardening times;
5) six look UV print, the PS version that solarization makes is installed on each print couple of printing machine, process color sequence is yellow, the colour of skin, specially red, blue, special red, black, wherein, specially red is the dominant hue of tin plate food pot product, multicolored sequence specially red be 95% dot percentage substitute print on the spot, wherein, print multicolored sequence special red time, UV lamp power 160w/cm ~ 200w/cm, power of turning on light is 75%, when printing other colors, UV lamp close, two groups specially red color density value after double exposure be 2.10g/m
2;
6) follow-up UV lamp group is solidified (UV lamp group is 4 lamps) continuously, UV lamp power 160w/cm ~ 200w/cm, and power 100% of turning on light, guarantees that ink solidifies completely;
7) glazing, selects the acrylic acid gloss oil of digestion resistant anyhow to leave a blank glazing, simulates white face and is coated with, carry out oil polish in printing figure message region, cut at traverse furrow and straight flute etc., welding region not oil polish, thus save gloss oil consumption, reduce production cost, gloss oil coated film amount 6.5g/m
2, coating speed 80 ms/min, solidification temperature 188 DEG C, 10 minutes hardening times, the print completing described tin plate food pot is coated with.
Embodiment 2
Be described further below by specific embodiment:
1) prepress file makes, plate-making software professional before selecting print, and to product documentation dominant hue part on the spot, select a kind of UV to print more stable circular shaped lattice point, angle of halftone screen line is 45 degree, replaces according to the dot percentage of 90%, forms bitmap file;
2) CTP directly makes a plate, and is uploaded to by the bitmap file of formation on computer master making machine, the Thermal sensitive plate that CTP is special carries out expose, printing down, copying time 2 minutes;
3) be coated with in, select the inside courtyard of epoxy novolac to be coated with at tinplate inner surface, film amount 6g/m
2, coating speed 90 ms/min, solidification temperature 205 DEG C, 15 minutes hardening times;
4) be coated with outward, the rustproof lacquer of the acrylic resin type selecting digestion resistant, processing characteristics good is coated with at the outer surface of tinplate, white face is coated with area size and will controls proper, too large, the leakiness white edge when printing, too little, easily cause the bad problem that comes off of ink adhesion when printing.Film amount 12g/m
2, coating speed 80 ms/min, solidification temperature 175 DEG C, 15 minutes hardening times;
5) six look UV print, the PS version that solarization makes is installed on each print couple of printing machine, process color sequence is yellow, the colour of skin, specially red, blue, special red, black, wherein, specially red is the dominant hue of tin plate food pot product, multicolored sequence specially red be 90% dot percentage substitute print on the spot, wherein, print multicolored sequence special red time, UV lamp power 160w/cm ~ 200w/cm, power of turning on light is 75%, when printing other colors, UV lamp close, two groups specially red color density value after double exposure be 2.20g/m
2;
6) follow-up UV lamp group is solidified (UV lamp group is 4 lamps) continuously, UV lamp power 160w/cm ~ 200w/cm, and power 100% of turning on light, guarantees that ink solidifies completely;
7) glazing, selects the acrylic acid gloss oil of digestion resistant anyhow to leave a blank glazing, simulates white face and is coated with, carry out oil polish in printing figure message region, cut at traverse furrow and straight flute etc., welding region not oil polish, thus save gloss oil consumption, reduce production cost, gloss oil coated film amount 6g/m
2, coating speed 90 ms/min, solidification temperature 195 DEG C, 12 minutes hardening times, the print completing described tin plate food pot is coated with.
In sum, tin plate food pot UV of the present invention prints and is coated with technique, except ensureing the attractive in appearance and serviceability of tin plate food pot product external packaging, by in product dominant hue on the spot part dot percentage substitute, printing, utilize the principle of dot gain in lithographic printing, dot percentage in dominant hue in food cans is printed as effect on the spot, thus mass defect-weld edge ink that the effect because of squeegee pressure causes can be reduced come off, optimize product quality further, simultaneously, dot percentage is adopted to substitute field printing, significantly can reduce the consumption of ink, reduce cost of goods manufactured, reach the object of energy-conserving and environment-protective.
Be noted that above embodiment only in order to technical scheme of the present invention to be described and unrestricted.Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not depart from the scope of technical solution of the present invention, it all should be encompassed in right of the present invention.
Claims (3)
1. the UV print for tin plate food pot is coated with a technique, it is characterized in that, comprises the steps:
1) prepress file makes, plate-making software professional before selecting print, and to product documentation dominant hue part on the spot, select circular shaped lattice point, angle of halftone screen line is 45 degree, replaces by the dot percentage of 90% ~ 95%, forms bitmap file;
2) off line is directly made a plate, and is uploaded to by the bitmap file of formation on computer master making machine, temperature-sensitive sheet material carries out expose, printing down, copying time 2 ~ 3 minutes;
3) be coated with in, select the inside courtyard of epoxy amino or epoxy novolac to be coated with at tinplate inner surface, be coated with thickness amount 5g/m
2~ 6g/m
2, coating speed 80 ~ 90 ms/min, solidification temperature 195 DEG C ~ 205 DEG C, 10 ~ 15 minutes hardening times;
4) be coated with outward, select the rustproof lacquer of polyester type or acrylic resin type to be coated with at the outer surface of tinplate, film amount 10g/m
2~ 12g/m
2, coating speed 80 ~ 90 ms/min, solidification temperature 175 DEG C ~ 185 DEG C, 12 ~ 15 minutes hardening times;
5) six look UV print, the PS version that solarization makes is installed on each print couple of printing machine, process color sequence is yellow, the colour of skin, specially red, blue, special red, black, and specially red is the dominant hue of tin plate food pot, and multicolored sequence is specially red is 90% ~ 95% dot percentage;
6) solidify, select UV lamp group to solidify continuously, UV lamp power 160w/cm ~ 200w/cm, power 100% of turning on light, guarantees ink solidification;
7) glazing, selects the acrylic acid of digestion resistant or vinyl gloss oil anyhow to leave a blank glazing, and simulation is outer to be coated with, and carries out oil polish, gloss oil coated film amount 6g/m in printing figure message region
2~ 7g/m
2, coating speed 80 ~ 90 ms/min, solidification temperature 185 DEG C ~ 195 DEG C, 12 ~ 15 minutes hardening times, the print completing described tin plate food pot is coated with.
2. a kind of UV for tin plate food pot according to claim 1 prints and is coated with technique, it is characterized in that, in described step 5), print multicolored sequence special red time, UV lamp power is 160w/cm ~ 200w/cm, power 75% ~ 100% of turning on light, when printing other color look sequences, close UV lamp, the color density value of two groups of special red sequences after double exposure is 2.10g/m
2~ 2.20g/m
2.
3. a kind of UV for tin plate food pot according to claim 1 prints and is coated with technique, and it is characterized in that, in step 6), the UV lamp quantity in described UV lamp group is 4.
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Cited By (8)
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| CN105691018A (en) * | 2015-09-30 | 2016-06-22 | 安徽中盛罐业有限公司 | Printing process for tin can |
| CN106739592A (en) * | 2016-11-21 | 2017-05-31 | 武汉宝钢印铁有限公司 | A kind of metal UV color printing product color separation prints coating method |
| CN107838318A (en) * | 2016-09-21 | 2018-03-27 | 东莞市大满包装实业有限公司 | A kind of metal can bottom and its manufacture method |
| CN109094230A (en) * | 2018-07-25 | 2018-12-28 | 广州美祺智能印刷有限公司 | A kind of color printing method not fallen the effect of ink |
| CN110217007A (en) * | 2019-05-30 | 2019-09-10 | 苏州工业园区彩迪包装印刷有限公司 | A kind of traditional silk-screen glazing process of local UV offset printing substitution |
| CN111558513A (en) * | 2020-05-30 | 2020-08-21 | 中粮包装(哈尔滨)有限公司 | Process for coating milk powder tin printing plate |
| CN111604245A (en) * | 2020-04-24 | 2020-09-01 | 漳州市闽达印铁有限公司 | Novel environment-friendly flexible metal decorating process |
| CN113442621A (en) * | 2021-08-03 | 2021-09-28 | 云南侨通包装印刷有限公司 | Printing method combining photoetching technology and digital jet printing |
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| CN105691018A (en) * | 2015-09-30 | 2016-06-22 | 安徽中盛罐业有限公司 | Printing process for tin can |
| CN107838318A (en) * | 2016-09-21 | 2018-03-27 | 东莞市大满包装实业有限公司 | A kind of metal can bottom and its manufacture method |
| CN106739592A (en) * | 2016-11-21 | 2017-05-31 | 武汉宝钢印铁有限公司 | A kind of metal UV color printing product color separation prints coating method |
| CN109094230A (en) * | 2018-07-25 | 2018-12-28 | 广州美祺智能印刷有限公司 | A kind of color printing method not fallen the effect of ink |
| CN110217007A (en) * | 2019-05-30 | 2019-09-10 | 苏州工业园区彩迪包装印刷有限公司 | A kind of traditional silk-screen glazing process of local UV offset printing substitution |
| CN111604245A (en) * | 2020-04-24 | 2020-09-01 | 漳州市闽达印铁有限公司 | Novel environment-friendly flexible metal decorating process |
| CN111558513A (en) * | 2020-05-30 | 2020-08-21 | 中粮包装(哈尔滨)有限公司 | Process for coating milk powder tin printing plate |
| CN113442621A (en) * | 2021-08-03 | 2021-09-28 | 云南侨通包装印刷有限公司 | Printing method combining photoetching technology and digital jet printing |
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Application publication date: 20150429 |