The ink printed on the surface of the paper, under the action of the paper's accumulation of gravity or the frictional force between the papers, or relative movement with other objects in contact with it, produces a stain on the back of the topmost paper, mainly pressing the dirty, Dirty, dirty, dirty and other forms. Some of the adjacent two prints stick to each other during the drying process.
1, the reasons for dirty print
(1) The paper surface is smooth, smooth, and the ink cannot be dried quickly.
(2) Too much ink will cause the ink layer of the printed matter to be too thick and difficult to dry.
(3) The ink is too thin and the viscosity is too small.
(4) The ink itself is poor in drying.
(5) The operator did not properly control the ink balance, resulting in ink emulsification.
(6) Overprinted prints, gravity embossing works.
(7) The paper has not yet dried and moved to rub.
(8) The surface of the impression cylinder is stained and transferred to the back of the print.
(9) The transfer roller has dirty tracks.
(10) There is shredded paper inside the machine and the printed matter is printed.
(11) All parts of the oil are excessively greased during maintenance and are thrown out during printing.
(12) The semi-finished product is bound when it is printed or the finished product is not dried.
2, the dirt generated by the folding process
Because the web offset press needs to fold after printing, the folding machine part is also easy to produce dirty prints, the main reasons are as follows:
(1) The paper path is worn incorrectly, and the print is in contact with the printing machine components (non-paper rollers), causing friction.
(2) There is too much ink on the paper roller.
(3) The folding machine triangle surface has ink deposits.
(4) Folding machine One-fold and two-fold transfer roller parts have accumulated ink on the surface.
(5) There is excessive ink deposit on the platen roller and the paper guide roller.
(6) There are too many ink deposits on some parts inside the folder.
(7) There are too many ink deposits on some parts inside the folder. When the folder is folded, it encounters prints in operation.
(8) Folding machines with pass-through belts cause friction between belts and printed products due to the inflexible or jammed rotation of the bearings holding the transfer belts, and the failure to rotate the belt when it does not turn or when it rotates.
(9) When the printed matter is not completely dry, if the operator of the code page contacts the graphic of the printed matter, it is easy to produce fingerprints.
(10) The main cause of adhesion is the over-thickness of the printed matter and the long time it takes to dispose. The oxidized conjunctiva between the sheets of ink releases a large amount of heat, prompting thorough drying, and the final formation of the page will not open up to form a “cake†shape.
3, exclusion method
(1) Adding and placing paper holders, according to a certain number, use special wood boards to separate the prints layer by layer, increase the contact between prints and air, and promote drying.
(2) Use a quick-drying ink.
(3) The appropriate amount of powder is used to spray a layer of powdery substance on the surface of each printed matter without affecting the subsequent process to prevent stickiness.
(4) Control the balance of ink and water, and adhere to the dry and dry ink operation.
(5) If necessary, add an appropriate amount of desiccant to the ink to speed up drying.
(6) After the printed matter has been printed for a period of time, it should be shaken loose, let the air enter, and add the drying speed.
(7) According to the different jobs, choose different types of printing presses, such as printing a large amount of ink and more goods advertising should choose a printing machine with a drying device.
(8) Do not move unfinished products and semi-finished products. Author: Yu Jian Li Lin shadow
1, the reasons for dirty print
(1) The paper surface is smooth, smooth, and the ink cannot be dried quickly.
(2) Too much ink will cause the ink layer of the printed matter to be too thick and difficult to dry.
(3) The ink is too thin and the viscosity is too small.
(4) The ink itself is poor in drying.
(5) The operator did not properly control the ink balance, resulting in ink emulsification.
(6) Overprinted prints, gravity embossing works.
(7) The paper has not yet dried and moved to rub.
(8) The surface of the impression cylinder is stained and transferred to the back of the print.
(9) The transfer roller has dirty tracks.
(10) There is shredded paper inside the machine and the printed matter is printed.
(11) All parts of the oil are excessively greased during maintenance and are thrown out during printing.
(12) The semi-finished product is bound when it is printed or the finished product is not dried.
2, the dirt generated by the folding process
Because the web offset press needs to fold after printing, the folding machine part is also easy to produce dirty prints, the main reasons are as follows:
(1) The paper path is worn incorrectly, and the print is in contact with the printing machine components (non-paper rollers), causing friction.
(2) There is too much ink on the paper roller.
(3) The folding machine triangle surface has ink deposits.
(4) Folding machine One-fold and two-fold transfer roller parts have accumulated ink on the surface.
(5) There is excessive ink deposit on the platen roller and the paper guide roller.
(6) There are too many ink deposits on some parts inside the folder.
(7) There are too many ink deposits on some parts inside the folder. When the folder is folded, it encounters prints in operation.
(8) Folding machines with pass-through belts cause friction between belts and printed products due to the inflexible or jammed rotation of the bearings holding the transfer belts, and the failure to rotate the belt when it does not turn or when it rotates.
(9) When the printed matter is not completely dry, if the operator of the code page contacts the graphic of the printed matter, it is easy to produce fingerprints.
(10) The main cause of adhesion is the over-thickness of the printed matter and the long time it takes to dispose. The oxidized conjunctiva between the sheets of ink releases a large amount of heat, prompting thorough drying, and the final formation of the page will not open up to form a “cake†shape.
3, exclusion method
(1) Adding and placing paper holders, according to a certain number, use special wood boards to separate the prints layer by layer, increase the contact between prints and air, and promote drying.
(2) Use a quick-drying ink.
(3) The appropriate amount of powder is used to spray a layer of powdery substance on the surface of each printed matter without affecting the subsequent process to prevent stickiness.
(4) Control the balance of ink and water, and adhere to the dry and dry ink operation.
(5) If necessary, add an appropriate amount of desiccant to the ink to speed up drying.
(6) After the printed matter has been printed for a period of time, it should be shaken loose, let the air enter, and add the drying speed.
(7) According to the different jobs, choose different types of printing presses, such as printing a large amount of ink and more goods advertising should choose a printing machine with a drying device.
(8) Do not move unfinished products and semi-finished products. Author: Yu Jian Li Lin shadow
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