General packaging decoration prints are colourful quality requirements. So, the influence factors of printed packaging bright colors are those? The analyses are made.
A, paper whiteness and absorption of the influence of the XianYanDu to printing color
The paper white degree is the foundation of bright color printing. The ideal paper to reflect all the colored light, and close to containing ash, black, slant green, slant red or other partial color paper will absorb part, cause the imprinting incident color hue, lightness and saturation will be affected, final expression for the difference of colour. This is equivalent to join the part of ink of other printing ink, performance is pure, ink and give a person a kind of hair, dark, turbidity and partial color feeling.
The main components of the paper for cellulose, glue material, packing, etc. And the ink flow part is the connection, the pigment ink feeding on the surface of the paper material in connection with dry and adhesion. The main components of the paper and ink are asymmetric type of molecules, when they are close to each other, rely on the second binding force make molecules in the paper to complete attached.
We now of packaging decoration prints mostly used coating of white paper, wood pulp manufacture of white paper, the common box paperboard, fine wood box paperboard, kraft paper and white cardboard. Due to the different production technology of difference of the paper mill, causing the surface of the paper white degree and smoothness of the significant difference. Therefore, printing machine in the moment of printed materials, printing ink connection liquidity in high low molecular part were forced into the paper larger pores, connection from the printing ink separation material began. If the ink pigment content high, in ink film will form massive in tiny capillaries, these large amounts of tiny capillary connection of ability, keep material surface than paper of fiber connection between material absorption ability. If pigment content low, can appear ink on the surface of the attached to the paper, the connection of the gap in the paper for the cause of the thing, printing ink film partial thin, pigment particles, which bare the colour does not bright-coloured.
Second, printing ink transfer and rolling process to printing color XianYanDu influence
If the color ink fountain in coating and ink roll when not clean, mixed with other color ink, certainly will cause partial color, also caused the bright color. Therefore, in the color change, be sure to put ink fountain, ink roll and water roller clean, especially in a dark light color should pay attention to clean. Is the usual practice in dark ink and wash clean, and then on to the use of shovel light color ink, beat well after period of time, the clean again.
For double color machine and many colors offset printing presses, especially the up and down to share a stamping roller equipment, must pay attention to the more mixed color it in the first place. Once mixed color will cause partial color, the color is not fresh.
3 ink excessive emulsification and add put additives to printing color XianYanDu influence the traditional offset printing, mainly still rely on the way to complete the printing ink painting balance process. According to the terms of the transfer process analysis, printing ink of emulsion is inevitable. But after the printing ink, excessive emulsification can cause printing color dodge, change the phenomenon such as old, the colour XianYanDu reduced.
According to the need to offset printing to various additives, such as diluent agent, dryer, etc. These additives to join too much, and sometimes also can affect XianYanDu color printing quality. Dilute agent have white ink, white oil, etc. Shortening is mainly composed of magnesium carbonate, stearic acid, printing ink oil and water mixture of emulsion liquid. This would make the ink emulsion liquid emulsion, cause color gloomy.
Dryer is the main metal, is also strong emulsifier of soap, and a small amount of dryer for ink can of emulsion have stability role, but addition amount, will cause too much of the ink serious emulsification.
Also, for graphic area less prints, in each cycle and ink roll to the reclamation and new ink and fewer number, so that the long-term stranded in ink roll of these ink will undergo several times the education version of the liquid mixing, extrusion and NianGa, cause the emulsion, cause serious ink colors bright-coloured.