In the printing process of handbag pattern, quality problems often occur due to inadequate plate making, ranging from waste of materials and man hours to scrapping of products, resulting in serious economic losses. To eliminate the above problems, we should pay attention to the following aspects.
1、 When different kinds of paper bags need to be assembled on a printing plate for printing, if the 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, and product D has a large color difference with the proofing. Therefore, the warm tone, cold tone and intermediate tone products should be put together in the same vertical position during the composition, so as to print excellent products.
2、 When making up the paper bag pattern, if the non graphic part of the carton is placed at its mouth, and the trailing tip is not a continuously adjustable image, but a flat screen or field, it is easy to produce "ghost" during the printing of the paper bag pattern, 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、 When making up paper bag patterns, 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 products, which will greatly affect the production efficiency and may cause major accidents due to the negligence of the printing and printing personnel.
4、 The film of paper bag pattern output usually does not contain pull gauge identification line, but if the mouth and trailing tip are blank, it will bring great inconvenience to the printing and positioning of carton. For this reason, it is necessary to make drawing gauge identification lines on the film. For packaging cartons that do 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, the pull gauge identification line is made at the outward part.
5、 The paper bag pattern ensures 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、 The paper bag pattern ensures the correct registration between different films, because a set of films is generally output twice, and its overprint accuracy is easily affected by some objective factors. Once the output film has quality problems, it shall be made again.
7、 Before printing, the paper bag shall carefully compare the film with the proofing draft. If the film density of the main color is too large, the exposure time during printing shall be added to avoid printing color bias; If the density is too small, reduce the exposure time during printing to avoid dot loss affecting color reproduction.
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