(1) different types of packaging printing needs to fight on a plate gravure printing when, if at the same or similar hue imposition products do not fight in the same longitudinal position may occur A product can reach proofs Standard, B product was close to standard proofs, C product with a slight color proofs, D product and color proofs larger phenomenon.
(2) the imposition of non-image areas are placed in packaging printing Diao mouth, and drag the tip of the discharge is not continuous tone images, the flat screen or in the field, then printing it is prone to "ghosting" Germany Ruba, seriously affecting the quality of products. This time should be put in the non-image portion of the tip of the drag, so as not to appear "ghosting."
(3) the imposition should also be careful not to save the film and the packaging printing product line is omitted, but on proofing and printing staff calculations gripper positions and finished, it will greatly affect the production efficiency, but also may be due to proofing and printing staff oversight figures, causing a major accident.
Pull the film generally free of regulatory marking line (4) output, but if its mouth and dragged the tip of the situation encountered are blank, give packaging printing positioning has caused great inconvenience. In this regard, it is necessary to make a pull gauge identification line on the film. Those who do not need mounted corrugated cardboard packaging printing, pull gauge identification line produced by the body on site; required mounted corrugated cardboard box printed flexible packaging, identification line pull gauge produced in outwardly site. Detection systems and instruments.
(5) To ensure correct registration between different film, it is because a film is generally twice the output, which overlay accuracy is easily affected by a number of objective factors. Film output quality problems occur, should be redone.
(6) To ensure compliance with the printing requirements of the film, after the film carefully check the graphics output on the film is consistent with the proofs.
(7) should be carefully compared with proofs metal packaging film, if the film density of the primary colors is too large, it should be added when the exposure time before proofing copy, print tone to avoid biased; if the density is too small, while reducing copy of exposure time, so as to avoid loss of impact dot color reproduction.