Pearl paper composition is the same as the ordinary whiteboard paper, namely by the underlying fiber, filler and surface coating of three parts. Unlike ordinary whiteboard paper has formed in its surface coating pearl effect of particles. The particles by the titanium dioxide (or other metal oxide) and mica particles, mica particles becomes coated with titanium dioxide (or other metal oxide) and form, the structure, thin sheet.
The characteristics of the pearl paper:
(1) the low surface energy, the adsorption properties of the ink
(2) the surface of the pearl effect is easy to be damaged
Pearl paper printing often have problems
(1) ink adhesion and dry printing field, low density, small network loss, as a result of poor, dry slow, opposite easy sticky dirty, easy to scratch and so on.
(2) the pearl effect is easy to lose, easy to form the white dots, hair flower, the phenomenon such as crease.
Pearl of the offset printing paper to note:
1. Process design
(1) design plate making
Because the pearl paper mainly embodies the paper pearl luxuriant effect, if the printing ink has a very large area, a couldn't reflect the paper pearl effect, second paper pearl effect through the ink layer has been greatly weakened. So, we should be in the design process according to the characteristics of the pearl paper printing design to avoid a large area of the ground. General design pattern, a few simple lines, words, can highlight the focus of the package content, can show the paper again luxuriant effect.
(2) the production process
As a result of the pearl paper pearl particles easily broken, semi-finished products can't afford to turn repeated sequence, friction, so the production process route should be short, as far as possible to cancel some unnecessary process, especially those who participate in more links by hand. To be a printed without twice without screen printing offset printing, can not even light of offline glazing, certainly not glazing resolute don't polish, because glazing will greatly weaken the pearl paper pearl effect.
2. Printing
There are three kinds of printing ink can be used in the pearl paper, on the basis of their print effect is good or bad, in order: the UV printing ink, the printing ink and ordinary ink absorbent paper.
(Gold Printing Group) |
