The bottle surface printing belongs to the container printing and can be completed with a curved screen printer. For bottles printed with non-polar pe and pp materials, such as shampoos, shower gels, cosmetics, and insecticides, the light curing ink is generally used. Therefore, the surface treatment of pe and pp must be performed before screen printing. In order to solve the adhesion of ink on it firmly. So, what are the best curing conditions for photo-curable inks? How to polarize the pe and pp bottles can achieve a good inking effect. This problem is described below.
First, prepress processing requirements and parameters for bottles (plastic pe, pp, pet, etc.)
At present, light-curing inks have not been directly used on untreated pe and pp bottles. Therefore, pe and pp bottles must be printed. Polarization must be performed on pe and pp before printing. Otherwise, uv ink cannot be firmly attached. So how to polarize?
There are many methods for polarization treatment. Most of the pe and pp plastics and their bottle industries use flame treatment. The result of this flame treatment is the use of flames containing free radicals such as o, n0, oh, and nh. The surface oxygen of high polymers such as pe, pp, etc. is extracted, followed by surface oxidation by free radical mechanism, and some polar oxygen-containing groups are introduced to undergo chain scission reaction, and polarization is changed for nonpolar pe and pp. The wettability of the surface ensures the fastness of the ink.
The water surface tension is 72.5 dyne/cm and the oil surface tension is 25-50 dyne/cm.
Flame treatment parameters: At present, most of the flame treatment units use gas as the combustion source and should control the air: gas = 7:1 to achieve the blue-violet flame, then the flame temperature can reach 1270. c, the length of the flame inner core is controlled at 6-19mm, the top of the flame core is at the surface of l0-15mm, the contact time is l-4 seconds (ldpe is 1-2 seconds, hdpe is 3-4 seconds), and the rotation speed is 100- 150 rpm, the surface depth can be treated in 40-90a, so that the pe, pp surface energy of 45 dynes / cm to meet the ink fastness requirements.
After the flame treatment of pe and pp plastic bottles, the polarization effect must be measured: when the pe and pp are treated by flame, the original surface tension must be >45 dyne to ensure that the uv ink adheres firmly. Therefore, the flame treatment effect is detected. It is very important that the method has Dyne test pen (using 35% ethylene glycol + 65% mixture of formamide) for detection and immersion test. It is generally used to detect by flooding, that is to say, the flame-treated pe and pp bottles are completely immersed in purified water, and then the bottle is taken out of the water for a short pause (about 10 seconds or so) to allow the excess water to flow out, and then the bottle is processed. Whether the surface of the part is covered with a uniform layer of water, if it is full of hydrophilicity and lasts for more than 15 seconds, it means that the flame treatment has reached the printable requirements. If the water film on the surface of the bottle is not continuous, it may even be like rain. After the lotus leaf is filled with water, it is necessary to adjust the flame treatment parameters to meet the requirements, such as the proportion of air and gas combustion, the time and distance of contact between the flame active ingredient and pe, pp, and so on.
Second, screen printing process parameters
1. The ink should be thoroughly stirred before printing, and the material splashed on the lid of the ink tank can be completely scraped into the ink and stirred evenly.
2. Screen and screen. Wire Mesh: Yellow, high strength, low stretch net with mesh number >355 mesh/inch. Screen: tension 18-25n/cm, with direct photosensitive or capillary film, film thickness 15-25 microns.
3. Squeegee: hardness 80 ° polyurethane tip scraping.
4. Screen cleaning with ordinary washing water.
5. Curing conditions: medium/high pressure mercury lamp, wavelength: 280-380nm, peak at 365nm. Power: 80-120w/cm or so. Over uv speed: The need to adjust the photocuring energy.
Third, the current plastic bottle printing better uv ink
1. United States Consolidation Ink
1ppc series: can be screen-printed on the pe, pp bottle, but also can be silk screened on the free-handling of the pet bottle, can get high adhesion effect, high gloss, waterproof ink layer, if silk screen amber and other colored pet bottles Hardeners are added to the ink to increase the adhesion of the ink.
2pci series: high gloss, screen printable pe, pp bottle ink, high adhesion strength, good water resistance.
2. Germany Di high light curing ink
1serit985uv has a high degree of gloss and good fluidity, such as the addition of curing agents more chemical resistance, suitable for processed pe, pp and pvc.
2serie988v has good viscosity, fluidity and chemical resistance on different materials and is suitable for processed pe, pp, pvc, ps and pet etc.
3. Japan's ten light-cured inks
Rcperg/rcpep-2(hv) has flexibility, chemical resistance, and good adhesion for use on processed pe and pp bottles.
4. French Dolby Light Curing Ink
Poiycolor/polyplus series, suitable for high-gloss uv inks on processed pe, pp, and pet bottles, with fine particles, high color density, good printability, and good pe, pp adhesion, and to enhance water resistance , Can add special hardener and solvent type two-component epoxy screen printing ink (8500 series), the ink is suitable for glass, metal, spray plate processing pe, pp and other substrates. Lucky Kai Huaguang Cup 2009 Top Ten Awards Print Awards Festival presents.
First, prepress processing requirements and parameters for bottles (plastic pe, pp, pet, etc.)
At present, light-curing inks have not been directly used on untreated pe and pp bottles. Therefore, pe and pp bottles must be printed. Polarization must be performed on pe and pp before printing. Otherwise, uv ink cannot be firmly attached. So how to polarize?
There are many methods for polarization treatment. Most of the pe and pp plastics and their bottle industries use flame treatment. The result of this flame treatment is the use of flames containing free radicals such as o, n0, oh, and nh. The surface oxygen of high polymers such as pe, pp, etc. is extracted, followed by surface oxidation by free radical mechanism, and some polar oxygen-containing groups are introduced to undergo chain scission reaction, and polarization is changed for nonpolar pe and pp. The wettability of the surface ensures the fastness of the ink.
The water surface tension is 72.5 dyne/cm and the oil surface tension is 25-50 dyne/cm.
Flame treatment parameters: At present, most of the flame treatment units use gas as the combustion source and should control the air: gas = 7:1 to achieve the blue-violet flame, then the flame temperature can reach 1270. c, the length of the flame inner core is controlled at 6-19mm, the top of the flame core is at the surface of l0-15mm, the contact time is l-4 seconds (ldpe is 1-2 seconds, hdpe is 3-4 seconds), and the rotation speed is 100- 150 rpm, the surface depth can be treated in 40-90a, so that the pe, pp surface energy of 45 dynes / cm to meet the ink fastness requirements.
After the flame treatment of pe and pp plastic bottles, the polarization effect must be measured: when the pe and pp are treated by flame, the original surface tension must be >45 dyne to ensure that the uv ink adheres firmly. Therefore, the flame treatment effect is detected. It is very important that the method has Dyne test pen (using 35% ethylene glycol + 65% mixture of formamide) for detection and immersion test. It is generally used to detect by flooding, that is to say, the flame-treated pe and pp bottles are completely immersed in purified water, and then the bottle is taken out of the water for a short pause (about 10 seconds or so) to allow the excess water to flow out, and then the bottle is processed. Whether the surface of the part is covered with a uniform layer of water, if it is full of hydrophilicity and lasts for more than 15 seconds, it means that the flame treatment has reached the printable requirements. If the water film on the surface of the bottle is not continuous, it may even be like rain. After the lotus leaf is filled with water, it is necessary to adjust the flame treatment parameters to meet the requirements, such as the proportion of air and gas combustion, the time and distance of contact between the flame active ingredient and pe, pp, and so on.
Second, screen printing process parameters
1. The ink should be thoroughly stirred before printing, and the material splashed on the lid of the ink tank can be completely scraped into the ink and stirred evenly.
2. Screen and screen. Wire Mesh: Yellow, high strength, low stretch net with mesh number >355 mesh/inch. Screen: tension 18-25n/cm, with direct photosensitive or capillary film, film thickness 15-25 microns.
3. Squeegee: hardness 80 ° polyurethane tip scraping.
4. Screen cleaning with ordinary washing water.
5. Curing conditions: medium/high pressure mercury lamp, wavelength: 280-380nm, peak at 365nm. Power: 80-120w/cm or so. Over uv speed: The need to adjust the photocuring energy.
Third, the current plastic bottle printing better uv ink
1. United States Consolidation Ink
1ppc series: can be screen-printed on the pe, pp bottle, but also can be silk screened on the free-handling of the pet bottle, can get high adhesion effect, high gloss, waterproof ink layer, if silk screen amber and other colored pet bottles Hardeners are added to the ink to increase the adhesion of the ink.
2pci series: high gloss, screen printable pe, pp bottle ink, high adhesion strength, good water resistance.
2. Germany Di high light curing ink
1serit985uv has a high degree of gloss and good fluidity, such as the addition of curing agents more chemical resistance, suitable for processed pe, pp and pvc.
2serie988v has good viscosity, fluidity and chemical resistance on different materials and is suitable for processed pe, pp, pvc, ps and pet etc.
3. Japan's ten light-cured inks
Rcperg/rcpep-2(hv) has flexibility, chemical resistance, and good adhesion for use on processed pe and pp bottles.
4. French Dolby Light Curing Ink
Poiycolor/polyplus series, suitable for high-gloss uv inks on processed pe, pp, and pet bottles, with fine particles, high color density, good printability, and good pe, pp adhesion, and to enhance water resistance , Can add special hardener and solvent type two-component epoxy screen printing ink (8500 series), the ink is suitable for glass, metal, spray plate processing pe, pp and other substrates. Lucky Kai Huaguang Cup 2009 Top Ten Awards Print Awards Festival presents.
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