Color deviation: the reasons may include
poor quality of the original manuscript, inaccurate plate making, inconsistent
control of book printing conditions,
good control of ink color, improper light source of the sample table, etc.
The color is pale, not bright: Reason may
be that the poor quality of the manuscript design, color separation, plate burning,
false impression too shallow, printing pressure and printing machine aging,
smooth white version of the excess liquid, paper rough, through the low.
Text flooding: the reasons may include low
density of positive images, high film foggy, too light printing ink,
insufficient printing pressure, aging printing press, excessive fountain
solution, insufficient ink volume, etc.
Paste version: due to the printing plate
image and text part overflow ink, resulting in the book printing on the substrate is not clear, it is a fault of
offset printing products.
Dirty plate: due to the printing plate
wetting part bag, resulting in the blank part of ink.
Off the plate: flat printing version of the
picture and text subtle tone lightened, dot and line area reduced, even lost ink
Dot gain: the dot area on the substrate is
larger than that on the corresponding part of the printing plate.
Ink stacking: ink or other substance
deposited on rollers or rubber sheets, forming embossed deposits that affect
ink and ink transfer.
Deinking: the phenomenon that metal ink
rollers oxidize and repel ink when corroded by moisture.
Ink emulsifying: the phenomenon of ink
absorbing wetting fluid during printing or the printing failure caused by
excessive absorption of wetting fluid in ink.
Pulping: when printing, the paper fibers,
or coatings fall off or are pulled off the paper due to the ink being too
sticky or the strength of the papa surface is different.
Printing malfunction: a general term for a
phenomenon that affects the normal operation of production or causes quality
defects in printed matter during printing.
Overprint error: the error of overprinting
Double image: a double outline of the same
color dot, line, or text that appears on a print.
Backside adhesion: the printing ink printed
on the substrate, stuck on the back of another sheet, resulting in a smear.
pictures and text printed on paper are visible on the back.