Screen printing ink mixing decided to silk screen printing precision
Screen printing has been the introduction of the traditional industry, one of them is the lacquer industry, bowl, drawer, box and other representative lacquer products can also be adapted to the modern way of life, has now developed to adapt to a variety of purposes of lacquer wares, through the implementation of a variety of printing method, improve the value of the product.Is in these decoration method, is widely applied on the lacquer screen printing gold and silver powder.
1.Silk screen printing and lacquer ware also technology.Lacquer is illuminated technology in wood, plastic on the bottom, red paint black painting first, again with lacquer painting the pattern on the surface, and then on the paint dry before hardening method of gold, silver.Its classification is high also, and also painted painting, grinding paint also draw.
Also technology has manual and automatic two kinds, general is given priority to with manual.Is also the first step of the design made the patterns of the contour plate, this procedure belongs to plate making in screen printing, so the shortage.The following order.
2.Printing equipment.For basin, drawer, box print equipment.Put version at the stage first, and then put on the stage and locate lacquer, locating fixed after the lacquer ware in addition.When a large number of printing, positioning and fixing device (for example, the substrates can be inserted into the convex type wooden table), the layout and printing the gap is 1 ~ 2 mm.Pot, bowl of substrates surface printing, centered on circular screen version, scraper, down substrates upward run, when the scraper, silk screen and substrates contact, silk screen version of the rotating blade pressure rotating the substrates, for printing.
3.Modulation of the printing paint.Here, we give a simple introduction of paint mixing method only.Paint do not in themselves as printing ink, paint viscosity is low, easy to mixed with bubbles and make the printing surface bubbles, could not reach the requirements of precise printing.Therefore, to attain good state of ink, paint needs to be modulated.Compared with other coating, paint drying conditions are completely different, is dried by oxidation, therefore, the need to control temperature and humidity.Printing paint viscosity adjustment: the ferric oxide, titanium oxide, such as protein, anhydrous silicic acid and paint mixing, to make fully, seal 4 ~ 5, viscosity can be adjusted to about 500 piece, can be use in printing ink.
4.Paint dry (ink) and also the time.Paint drying are greatly influenced by the temperature and humidity, the best drying conditions of temperature is 30 ~ 35 ℃, humidity 75% ~ 75% also time is proportional to the drying time, the greater the viscosity of paint (ink) drying the faster also.
5.The accuracy of the printing.Adjust the paint (ink) fluid in 65% above or below 40%, as a condition of print is not very ideal.The liquid paint, to take off the bad, leave traces of paint.Especially in the surface of substrates, along the direction of the printing can be clearly seen.In addition, the liquid paint, paint illiquid, surface printing design is not stable, leave traces of cables, especially when printing gold, silver, the network is very obvious.Plate with silk screen the general purpose of 250 ~ 300, nylon net, its precision is good.Due to the paint need special drying conditions, so it is not easy to screen blocking phenomenon, printing good maneuverability.
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