How to prevent anti-set off printing
How to prevent anti-set off printing
The ink on the paper must be dry before it comes into contact with the next sheet, so choosing the right ink is very important of book printing. The following factors should be taken into account to control reverse printing:
1. Type of printing ink used; 2. Printing speed; 3. The distance between the printing press and the stack; 4. The extrusion produced when the printed paper is piled up; 5. Absorbability of paper; 6. Spray type used.
Paper ink absorption on the back of a great impact. Choosing the right paper will reduce the disadvantages of back printing and ink sticking. Because the paper surface absorption variation is very large, so printing ink also want to make a good choice. It is best to send the printing paper to the ink supplier to help select the most suitable curing ink. If the number of trials is small, the results are not very accurate. Experienced printing houses will have an advantage in choosing paper and ink.
Back printing ink shortcomings can be found in the early printing, once found should be dealt with in time. If the sheet has been printed more than once, a very small amount of powder can be sprayed on the paper before printing properly to prevent back printing. Otherwise, the powder will be transferred to the rubber cylinder and affect the book printing quality. The static electricity generated by paper printing will also increase the appearance of back printing. Static electricity causes the sheets of paper in the collection pile to accumulate and causes the separate air cushion maintained between the sheets to be quickly extruded. Static problems occur when the relative humidity of the printing room is below 35%R.H. Humidification and electrostatic neutralization can reduce the static problems of the printing press. The use of higher printing concentration of ink, with less moisture can improve the surface smoothness of the ink layer, so as to reduce the occurrence of back printing.
