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Printing faults and Solutions

From: 本站 Author: admin Posted: 2020-09-09 14:20:57 View: 8
Pull paper wool. The main reason is that the ink viscosity is too big or the paper strength is poor. The elimination method is to add appropriate amount of ink remover to reduce ink viscosity, and use paper with high surface strength to reduce the speed of printing machine.

(1) Pull the paper. The main reason is that the ink viscosity is too big or the paper strength is poor. The elimination method is to add appropriate amount of ink remover to reduce ink viscosity, and use paper with high surface strength to reduce the speed of printing machine.

 

(2) The color of the print becomes lighter. The main reason is that the thixotropy of the ink is too large and the viscosity is too small. The elimination method is to add new ink with high fluidity or add resin inking oil with high viscosity.

 

(3) The ink is powdered and discolored. The main reason is that the ink is insufficient, viscosity is too small, drying is too slow, water resistance is too poor. Paper ink absorption is too strong, fountain solution or paper acidity is too big. The elimination method is to speed up the drying speed of ink, add red dry oil to the ink appropriately, reduce the acidity of fountain solution and reduce water supply.

 

(4) Adhesion. The main reason is that the amount of powder is too small, the paper pile is too high, and the ink curing is too slow. Elimination method is to increase the amount of powder injection, reduce the thickness of finished product accumulation, select the amount of fast fixed oil, or add polyethylene wax in the ink.

 

(5) Drying is too slow. The main reason is that the drying agent in the ink is insufficient, and the acidity of paper or fountain solution is too strong. The elimination method is to add an appropriate amount of desiccant in the ink, adjust the pH value of fountain solution.

 

(6) Flying ink. The main reason is that the ink layer is too thick, the viscosity is too small or the ink roller installation is not reasonable. The elimination method is to use better thick ink, reduce the amount of ink, check whether the ink roller installation is reasonable, eliminate static electricity, and improve the indoor temperature.

 

(7) Paste. The main reason is that the proportion of ink is too large, the content of powder is too high, the particles are coarse, the viscosity is too small, the water resistance is poor, the ink layer of ink roller and plate is too thick, and the paper is powdered. The elimination method is to increase the viscosity of ink or add new thick ink to adjust or replace the paper.

 

(8) Pile rubber. The main reason is that the ink water resistance is too poor, the viscosity is small, the connection material is insufficient, the transfer is not good, or the paper powder. The elimination method is to adjust the specific gravity of the ink and add the ink with higher coloring power to improve the water resistance of the ink or replace the better paper.

 

(9) Ink roller. The main reason is that the water resistance of the ink is not good, the viscosity is too large, the water supply of fountain solution is too large. The elimination method is to add new ink, reduce the water supply of fountain solution or add isopropanol in fountain solution to improve wettability and increase volatility.

 

(10) Dirty oil. The main reason is that the ink water resistance is too poor, viscosity is not enough, oil is too strong. The elimination method is to improve the viscosity of the ink, add a small amount of extra oil, change to quick dry type bright ink, add a small amount of light magnesium carbonate in the ink to reduce the oil, or try not to use the lake pigment ink.

 

(11) Dirty version. The main reason is that the ink is too soft, viscosity is small, water resistance is too poor, run version solution acid and Arabic gum is insufficient, water glue is not clean. The elimination method is to replace the ink with good elasticity, add the appropriate amount of Arabic resin gum in the fountain solution, improve the acidity of the fountain solution, add the appropriate amount of isopropanol, and thoroughly clean the wet plate roller.

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