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UV curable Ink

UV curable Ink 2010-5-12

Printing is printing the surface of the container bottle with a curved screen printing machine can be completed. As for the use of non-polar nature of PE, PP materials are processed into the bottle, such as shampoo, shower gel, cosmetics, pesticides and other bottles of printing, generally light-cured inks are used, it must be on screen before the PE, PP surface Treatment can only solve the ink on it's attached to a solid. So, the best cure light-cured ink What are the conditions? PE, PP bottle how to handle polarization to achieve good results dwell on this issue, described below.
1, bottles (plastic PE, PP, PET, etc.) pre-press processing requirements and parameters

At present no direct light-cured inks for untreated PE, PP bottle, so to Indian PE, PP bottle, in the pre-press must be PE, PP for polarization treatment, or UV ink may not securely attached. So how to handle polarization?

There are many ways to deal with polarization, in PE, PP plastic bottle industry, most of the flame and its treatment methods, the results of this treatment is the use of flame flames with O, N0, OH and NH and other free radicals, which can the polymers such as PE, PP and surface oxygen extracted, then the mechanism of surface oxidation by free radicals, and introducing a number of polar functional groups containing chain scission reactions occur on Promise of PE, PP to change to achieve polarization wettability of the surface to ensure adhesion of ink fastness.

Water surface tension 72.5 dyne / cm, oil surface tension 25-50 dyne / cm.

Flame treatment parameters: flame treatment units currently use the gas for combustion sources the majority, should control the air: gas = 7:1 to achieve the blue-violet flame, then flame temperature up to 1270. C around the flame within the core length control in 6-19mm, the flame core to the surface of the top l0-15mm, exposure time of l-4 秒 (LDPE 1-2 seconds, HDPE 3-4 seconds), rotation speed of 100 - 150 r / min, can handle the surface depth of 40-90A, to PE, PP surface energy of 45 dyne / cm to meet the fastness of ink adhesion requirements.

On PE, PP plastic bottle effects of flame treatment, the detection of polarization: while PE, PP treated by the flame, must be> 45 dyne surface tension value of the original UV ink firmly to ensure adhesion, the treatment effect of the test flame is very important, its methods of dyne test pen (35% + with ethylene glycol 65% formamide mixture) detection and immersion testing.Now widely used to detect the flooding, about to flame treated PE, PP bottle full immersion in water, and then will pause for a moment removed from the water bottle (about 10 seconds or so) to allow excess water out, then watch the bottle is processedparts of the surface is covered with a layer of water film, if covered and the hydrophilic continuous l5 seconds, it indicates that the flame has reached the printable address the requirements of the surface water film if the bottle is not continuous, or even like the rain situation after the drops on a lotus leaf, then we must adjust the flame treatment parameters to meet requirements, such as the combustion air and gas ratio, flame active ingredient with PE, PP exposure time and distance and so on.

Second, screen printing process parameters

1. Ink thoroughly before mixing in the printing and ink spilled on Shing lid on all the scraped material into the ink evenly.

2. Wire Mesh and Screen. Mesh: mesh> 355 mesh / inch yellow, high strength, low extension network. Web version: Tension 18-25N/cm, or capillary plasma by direct photographic film, film thickness of 15-25 microns.

3. Squeegee: hardness of 80 ° polyurethane sharp blow.

4. Screen cleaning wash with ordinary tap water.

5. Curing conditions: medium / high pressure mercury lamp, wavelength :280-380nm, 365nm peak in the well. Power :80-120W / cm or so. Through UV speed: Adjust the light curing energy needs.

Third, the current plastic bottle of UV ink printing is better

1. The United States promise solid light-cured ink

① PPC Series: Screen Printing treated PE, PP bottle, screen printing at the same time can avoid dealing with the PET bottle, can have the effect of high adhesion, high gloss, water-resistant ink, so if the screen amber colored When PET bottles, Mexico and Canada in the hardening agent, make a higher ink adhesion.

② PCI Series: High gloss, can be screen processed PE, PP bottle ink, adhesive strength, good resistance to water.

2. German Di Gaoguang curing ink

① Serit985UV high gloss and good liquidity, such as adding more curing agent chemical resistance, suitable for processed PE, PP and PVC.

② Serie988V, there is good material in different viscosity, fluidity, chemical resistance, suitable for processed PE, PP, PVC, PS, and PET and so on.

3. Japan's 10 light-cured ink

RCPERG/RCPEP-2 (HV) with the flexibility, chemical resistance, good adhesion, has been treated for PE, PP bottle.

4. French Dolby light-cured ink

POIYCOLOR / POLYPLUS series, for processed PE, PP and PET bottles with high gloss UV inks, with fine grain, and color density, good printability and processing of PE, PP, good adhesion, to enhance the water resistance , you can add special two-part epoxy curing agents and solvent-based screen printing ink (8500 series), the ink applied to glass, metal, spray version of dealing with PE, PP and other substrates. Lucky Wah Kwong Cup 2009 Top Ten Award Presentation Ceremony wonderful print show

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