Card Printing

Reason:
a. the ink is not dry enough and the anti-fusion of ink layer is bad
b. the ink layer can be dissolved by the coating solvent
c. the solvent is not dry enough with high amount of residue;
Solutions:
a. glaze the presswork when it is dry;
b. reduce the amount of solvent in coating, or change the solvent or coating if allowed;
c. lower the belt, increase the dry temperature and reduce solvent residue in coating;
The paper is easy to be creased (especially for thick paper)
Reasons:
a. the high temperature causes fiber’s moisture content reduced, thus, the fiber is crisp;
b. great pressure cause presswork bad extensibility and flexility;
c. bad performance in processing when glazed;
d. unsuitable after-process
Solutions:
a. reduce the calendering temperature and take measures to keep the moisture;
b. reduce the calendering pressure; for bad quality paper, it shall not calendered as soon as glazed;
c. choose glazing paints with better after-process;
d. adjust the after-process conditions;
It is hard to release to belt from the presswork during the calendering
Reasons:
a. the calentering temperature is higher;
b. the coating is not dry enough with too much residue;
c. the calendering coating is too thick and gets sticky when heated;
d. calendering pressure is great;
e. the calendering belt surface is dirty or there are products of resin on it;
Solutions:
a. reduce the temperature properly;
b. the coating shall be fully dry before calendering;
c. adjust the calendering pressure and reduce coating thickness;
d. reduce the calendering pressure
Polish the calendering belt when clean it;
There are streaks, orange skin, floating, etc in the film face
Reasons:
a. the buffing oil is sticky and the coating is thick;
b. bad performance of leveling of buffing oil and uneven coating;
c. the ink is not dry, and reject the buffing oil;
d. too much dust on the surface of presswork;
e. ink on the presswork surface is crystallized and the coating is floated;
f. the calendering temperature is low that can not soften the film;
g. the calendering pressure is small;
Solution:
a. reduce the oil viscosity and improving the leveling performance;
b. the ink must be dry before calendering;
c. when the ink is crystallized, it must be coated with a primer;
d. increase the calendering temperature and pressure;