High-cleanliness tinplate plate printing process
A flat printing, high cleanliness technology, applied in the printing process, printing, printing of special varieties of printed matter, etc., can solve the problems of low qualified product rate, poor quality of printed iron, low production efficiency, etc., to achieve clear fonts and patterns, Good surface gloss and high rate of qualified products
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Embodiment 1
[0029] A high cleanliness tinplate lithography process, comprising the following steps:
[0030] (1) Pre-treatment: surface treatment of tinplate, and then internal and external coating;
[0031] (2) Plate making: color-separate the original manuscript to be printed, make a sample image of the color-separated pattern on the PS board, and then expose the PS board through a continuous drying machine to form a printing plate;
[0032] (3) Printing: using an offset printing machine and a printing plate to transfer the ink to the outer coating surface of the tinplate;
[0033] (4) Drying: Put the tinplate into the drying box and then pass through the heating zone, constant temperature zone and cooling zone for drying.
[0034] In the step (1), the inner coating step is as follows: coating the reverse side of the tinplate with transparent oil or gold oil, and curing in an oven at a temperature of 180° C. for 15 minutes. Clear oil or gold oil is phenolic resin coating or epoxy-phen...
Embodiment 2
[0044] The difference between this embodiment and the above-mentioned embodiment 1 is:
[0045] In the step (1), the internal coating step is as follows: coating the reverse side of the tinplate with transparent oil or gold oil, and curing in an oven at a temperature of 182° C. for 12 minutes. Clear oil or gold oil are acrylic paints or epoxy amino paints.
[0046] In the step (1), the external coating step is as follows: coating the front surface of the tinplate with primer or white magnetic oil, and curing in an oven at a temperature of 152° C. for 12 minutes. The base oil is modified vinyl resin base oil; the white magnetic oil is acrylic resin white magnetic oil.
[0047] In the step (2), the non-graphic part of the PS board is coated with a fountain solution, and the pH value of the fountain solution is 5.2.
[0048] In the step (4), the temperature in the heating zone is gradually increased from 22°C to 72°C, the temperature in the temperature zone is constant at 72°C,...
Embodiment 3
[0052] The difference between this embodiment and the above-mentioned embodiment 1 is:
[0053] In the step (1), the internal coating step is as follows: coating the reverse side of the tinplate with transparent oil or gold oil, and curing in an oven at a temperature of 185° C. for 10 minutes. Transparent oil or gold oil is a polyester resin coating with a solid content of 33%-37% and a viscosity of 60-80s.
[0054] In the step (1), the external coating step is as follows: coating the front surface of the tinplate with primer or white magnetic oil, and curing in an oven at a temperature of 155° C. for 10 minutes. The base oil is a polyester resin base oil with a solid content of 23%-27% and a viscosity of 40-50s; the white magnetic oil is a polyester resin white magnetic oil with a solid content of 57%-63% and a viscosity of 160-200s.
[0055] In the step (2), the non-graphic part of the PS board is coated with fountain solution, and the pH value of the fountain solution is 5...
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