1: (1) Different kinds of cartons need to be assembled on a printing plate for gravure printing. If products with the same or similar colors are not assembled in the same longitudinal position during assembly, there may be a phenomenon that product a can meet the proofing standard, product B is basically close to the proofing standard, product C has a slight color difference with the proofing draft, and product D has a large color difference with the proofing draft For plate printing, warm tone, cold tone and intermediate tone products shall be put together in the same longitudinal position during plate making, so as to facilitate the printed products.
2: (2) when making up, if the non graphic part of the carton is placed at its mouth, and the trailing tip is not continuously adjusted image, but flat screen or field, it is easy to produce "ghost" drupa during printing, which seriously affects the product quality. At this time, the non graphic part should be placed at the trailing tip, so that there will be no "ghost".
3: (3) when making up, it should also be noted that the carton finished product line should not be omitted in order to save film, but rely on the printing and printing personnel to calculate the position of its mouth and finished product, which will greatly affect the efficiency, and may cause major accidents due to the negligence of printing and printing personnel.
4: (4) The output film usually does not contain the pull gauge identification line, but if the mouth and trailing tip are blank, it will bring great inconvenience to the printing and positioning of the carton. For this, it is necessary to make the pull gauge identification line on the film. For the packaging carton that does not need to be mounted with corrugated board, the pull gauge identification line shall be made at the body part; for the packaging carton that needs to be mounted with corrugated board, it shall be soft packaged, The pull gauge identification line is made at the outward part. Detection system and instrument
5: (5) ensure that the film meets the printing requirements. After the film is output, carefully check whether the pictures and texts on the film are consistent with the proofing draft (the carton knife plate line as the check benchmark must be standardized).
6: (6) ensure the correct registration between different films, because a set of films is generally output in two times, and its overprint accuracy is easily affected by some objective factors. Once the output film has quality problems, it should be made again.
7: (7) before printing, carefully compare the metal packaging of the film and the proofing draft. If the film density of the main color is too high, the exposure time during printing shall be added to avoid printing color bias; if the density is too low, the exposure time during printing shall be reduced to avoid dot loss affecting color reproduction.
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