Indian railways is the tinplate printing pattern on the (tin plate).Mainly using the physical properties of water and ink receptivity, with the aid of printing pressure, the rubber cloth plate by transfer to the tinplate, belongs to the principle of offset lithography.This process has special requirements for ink.
The printing principle:
Tinplate printing is also use the physical properties of water and ink receptivity, with the aid of printing pressure, the rubber cloth plate by transfer to the tinplate, belongs to the principle of offset lithography.Because the tinplate has special physical and chemical D and print processing performance again, the printing process is different from ordinary offset printing have larger.
Tinplate printing has special requirements for ink:
1, require ink has good adhesion and mechanical properties Because of the tinplate printing will ultimately made canned food, toys, metal photo frames and chemical products of barrels, cans, subject to cutting, bending and stretching process, and requirements of tinplate printing ink has good adhesion and the corresponding mechanical properties.In order to improve the printing ink adhesion, you first need to printing the white backing on tinplate.White is all picture gezer, has a high brightness.Can join other high-energy degrees of hue, lightness and improve various phase formation levels.
2, the special structure of printing equipment Because of the different substrates, tinplate printing auxiliary mechanism also is different from the offset printing paper.Tin does not dissolve in water, no solvent adsorption, so printing ink subject to high temperature baking to make solvent volatilization conjunctival curing.So printing device generally need to be equipped with the chamber.The tinplate printing automatic line generally is about more than 50 miles in length and has the characteristics of large precision.In addition, tinplate printing machine is the use of magnet say good bye and double control of tinplate material of high hardness also determines the printing process cannot adopt advanced continuous lose iron structure, the push, and stacking of structure are different from those of offset printing paper.
3, the requirement of colors Tinplate printing color ink, in addition to should have a certain degree of water resistance, still need to have their special requirements.Because tin surface impervious water and solvent, need after baking dry, so the ink shall be the heat type.Higher requirements of pigment tinting strength and durability.Printing ink, in addition to should have the basic properties of the general offset printing ink, heat resistance, according to the characteristics of the printing should have ink film adhesion, impact resistance, good hard, cooking and light resistance, etc.

4, printing ink drying process

In the production of tinplate printing, printing ink drying is a complex physical and chemical reaction process.To reasonably control the ink drying speed, to master the physical and chemical mechanism of ink drying, can effectively fast printing operations, to ensure product quality.Ink drying too fast will reduce the normal transfer ink performance, affect production;Cause imprinting breezing, inky hair light, plate, ink roller surface printing ink hard and make the transfer of the ink is blocked;Outward expansion of the plate by hard layer;Make desiccant dosage caused by ink adsorption increases, the phenomenon such as blank part is dirty.And ink drying too slow and can cause overprint difficulties, adhesion, adhesion, strong degree;Easy to cause scratches in the process of transfer, etc.So ink drying speed is appropriate, too fast too slow are unfavorable.

5, the requirements of the white ink
Tin plate surface is silvery white (or yellow), with metallic luster, before printing color graphic, need printing the surface coated white or white, restricted by ink coverage, monochrome machine often need to the two white, the white degree can reach 75%.Whiteness as an important indicator of tinplate printing products quality, for white ink has a good adhesion with the primer, through many high temperature baking is not yellow, resistance to high temperature steaming do not fade.Primer on tinplate can increase the adhesion with tin, white ink has a good adhesion strength of hard coating.Common primer is amino epoxy type, have color shallow, after many baking yellowing, aging characteristics and flexibility, impact resistance performance.

Professional main: dongguan, candy jar wholesale, wholesale mooncake cans, moon cake boxes, wholesale, wholesale cookie jar briefly such as tin tin box printing printing is printed on tinplate (tin plate).Mainly using the physical properties of water and ink receptivity, with the aid of printing pressure, the rubber cloth plate by transfer to the tinplate, belongs to the principle of offset lithography.This process has special requirements for ink.