Technology News

Color factors

2016-07-11 15:13:51

The whiteness of paper is the foundation of the printing colors. Ideal paper reflects nearly all the colours, and ash, black, green, red or other color paper can absorb part of the incident light, lead to mark the hue, lightness and saturation are affected, the final show the color difference. This is equivalent to join some other ink in the ink, do well the ink is not pure, so as to give a person a kind of dark, cloudy and partial color feeling.

The main components of the paper for fiber, rubber, packing, etc. Part is the connection of material and ink flows, ink pigment by connection material on the surface of paper conjunctival dry and adhesion. The main components of the paper and ink are asymmetrical type, when they are close to each other, rely on two binding force make molecules on the paper attached. Now most of packaging and printing enterprise packaging decoration prints using coated white board paper, wood pulp, ordinary corrugated board paper, liner board paper pulp manufacture corrugated board paper, kraft paper and white cardboard. Due to the difference of different production process of paper mill, the surface of the paper whiteness and smoothness of significant differences. As a result, the printer at the instant of the embossing, high liquidity in the ink connection material is pressed into the low molecular part of the paper the larger pores, connection is expected to start from the ink. When the ink pigment content high, inside the ink film can be formed a large number of tiny capillaries, the large number of small capillary's ability to keep connection material, than on the surface of the paper fiber gap connection material absorption ability. Low when the content of pigment, can appear ink adhesion on the surface of the paper, the connection is most into the paper, the gap caused by the ink film on the substrates slants thin, pigment particles, the final color is not bright.

Ink color ink fountain in coating and ink roller is not clean, mixed with other color, is bound to cause partial color, also result in bright colors. Therefore, in the color change, be sure to put the ink fountain, ink roller and water roller clean, especially when dark in light more attention should be paid to clean. Typically, after washing clean, dark ink shovel on part of the light color of the ink to be used again, well after a period of time, cleaning again. For two-color machine and multi-color offset press, especially the upper and lower units share a embossing roller equipment, more attention should be paid to mixed color. Once mixed color will cause partial color, the color is not bright.


Traditional way of offset printing, mainly rely on ink balance to complete the printing process. According to the ink transfer process analysis, ink emulsification is inevitable. But after excessive emulsification of printing ink, can cause printing quality and color dodge, the phenomenon such as stale, the lower crisper. Offset printing according to the need to add various additives, such as thinner, drier, and so on. These additives to join too, and sometimes will affect printing quality crisper. Thinner with white ink, white oil, etc. White oil is mainly composed of magnesium carbonate, stearic acid, ink mixture of oil and water of emulsion. This kind of emulsion would lead to ink emulsification, colour and lustre is dim. Drier is mainly metal soap, is also a strong emulsifying agent, a small amount of drier can emulsification stability effect of ink, but add too much, can cause serious emulsification of printing ink. In addition, for the printing graphic area is less, in each period to the new ink and ink roller to add quantity is less, so long the ink in ink roller will undergo several education version fluid mixing, extruding and rolled, cause serious emulsification of ink, the color is not bright

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