General packaging decoration prints are colourful quality requirements. So, the influence factors of colorful packaging prints are those? A brief analysis below.
A, paper whiteness and absorption of the influence of XianYanDu to printing color
Paper whiteness is printing colourful basis. The ideal paper can reflex all light, and the close with grey, black, slant green, slant red or other partial color paper can absorb part, resulting in the incident ray molecularly imprinted hue, lightness and saturation will be affected, final expression for colour difference. This is equivalent to a part of the ink joined other printing ink, excellent performance, thus not pure ink gives a person a kind of sends dark, turbidity and partial lubricious feeling.
The main components in paper cellulose, glue materials, packing, etc. But ink flow part is the connection, the pigment ink feeding on the surface of the connection materials in paper conjunctival dry and adhesion. Paper and ink main ingredients are the unsymmetrical molecules, when they close, rely on second adhesion molecules in the paper to finish attached.
We now of packaging decoration prints mostly used coating whitepaperboard, wood pulp manufacture whitepaperboard, common box paperboard, wood pulp manufacture box paperboard, kraft paper and white cardboard. Due to the different production technology of far, causing the differences of paper whiteness and smoothness surface of significantly different. Therefore, in the moment stamped printer ink connection expected liquidity high low molecular part were pushing paper larger pores, connect isolated from ink feeding began. If the ink pigment content high, in ink film can be formed within large amounts of tiny capillaries, these tiny capillary reserves of ability to connect material, the fiber surface than paper absorption connection between material ability. If pigment content low, can appear ink on the surface of the attached to the paper feeding, causing the most connected into paper printing, among that caused by void the ink film slants thin, pigment particles, which bare the colour not bright-coloured last.
Second, printing ink transfer and rolling process to printing color XianYanDu influence
If the color ink fountain and ink when in coating is not clean, mixed with a roll of other color, would cause partial color, also cause color not bright-coloured. Therefore, changing color, be sure to put ink fountain, ink roll and water roller clean, especially when dark change light color more should pay attention to clean. Typically, the dark ink and wash clean again after the shovel to be used in part, light color ink beat well after period of time, then cleaning.
For double-color machine and multicolor printing, especially fluctuation units share one stamping roller equipment, more should pay attention to mix a color happening. Once mixed color will certainly cause partial color, causes the color is not bright-coloured.
3 ink excessive emulsification and add put additive effects of XianYanDu to printing color of traditional offset printing mode, still basically rely on ink printing process to accomplish the balance. According to the ink transfer process analysis, ink emulsification is inevitable. But after the excessive emulsification, can cause printing ink color dodge, become obsolete etc. Phenomenon, causing XianYanDu reduce color.
Offset according to the need of additive to join, such as diluent agent, dryer, etc. These additives joins overmuch, sometimes also can affect print colour XianYanDu. Dilute agents have white ink, white oil, etc. Shortening is mainly composed of magnesium carbonate, stearic acid, printing ink oil and water mixture of emulsion. This kind of emulsion liquid emulsion, cause will prompt ink color gloomy.
Dryer mainly metal soap class, is also strong emulsifier, a small amount of dryer for ink can emulsified have stability function, but the addition amount of too much, can cause serious emulsification ink.
Also, for graphic area less prints, in each cycle to evenly ink roll the reclamation and new ink and fewer number, stranded in ink roll such long-term of these ink will undergo several embellish version of liquid mixing, squash and NianGa, causing serious emulsification, cause ink colors bright-coloured.