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Because the ink is too sticky, too thick, or the ink is too long to have ink marks on the non-graphic part of the plate, it is transferred to the blank area of ​​the paper.
The solution is to use a dilute ink or high-boiling solvent and other inks. Some fillers are added to the ink and mixed with a three-roll mill. Magnesium carbonate may also be used as the filler.
31. Fouling When the pigment particles in the ink are relatively fine and the color is relatively strong, and the defects of the layout are larger than those of the pigment, a dull and dull color appears on the printed product.
The solution is: use different pigments and different fillers to mix the ink (not just a pigment or filler).
32. Adhesion or poor flexibility The ink film is brittle after drying, and the link material in the ink does not adhere to the surface of the substrate. The ink film can be scratched, wiped (or glued), or gently wiped to fall off. . Especially on non-absorbent substrates (such as polyolefin films), the finger strength and kneading strength are extremely high. When the tape is used for peeling test, it is easy to peel off, and sometimes the rubbed version of the award is peeled off. Degree of skill is poor. The reason is that the amount of binder (binder) in the ink is too small or the binder is unsuitable; the paper absorbs too much; or the quality of the plastic film of the substrate has a problem or is improperly handled; the solvent used in the ink is not suitable.
The solution is: plasticizers can be added to inks; inks with more binders should be used; papers with poor absorptivity should be replaced; polyolefin films that meet the requirements should be selected and modified; Good ink; change diluent solvent and other methods.
33. The color is too strong or too weak because the ink is too thick and sticky; the photogravure printing plate is corroded too deeply; the absorption of the paper is poor; and the color of the printed product is caused by too strong or insufficient color.
The solution is: add some binder or solvent to the ink to dilute it; use new paper; or use a new plate.
34. The phenomenon of sticky-edge web (or plastic, etc.) of printed materials sticking on the back side during winding and the phenomenon of sticking on the back side during winding is commonly referred to as stickiness. The reason is that the ink's dryness is too slow; the spiritual civilization's evaporation rate is too slow; the solvent contains high-boiling fractions; the resin used in the ink has poor solvent release; the inks have too little pigment and filler automaton; the ink is plasticized. Too much agent.
The solution is to: reduce the speed of the printing press; add more fillers in the ink; the small country with a narrower fraction of the solvent; use good solvent release resin; reduce the amount of plasticizers and so on.
35. Poor quality of printed materials Due to the precipitation of pigments in the ink, the color is insufficient, resulting in insufficient color of the printed product and a spotted appearance.
The solution is: to re-stir the ink; or add new ink; and make the ink tank sealed.
36. The crater-like spots, due to the sudden volatilization of the solvent between the thick ink layers, destroyed the surface of the ink film, leaving behind a colored ring.
The solution is: reduce the dryness of the ink; increase the flow properties of the ink. (Continued from the seventh edition) (Extracted from "Packaging")
30. Dirty (also known as dirty)