The decorative printing of hollow plastic bottles in the form of blow molding is mainly based on screen printing and flexographic label printing. Screen printing is a direct printing. Self-adhesive label printing is an indirect printing that prints graphics on a self-adhesive label printing machine and then transfers it to a plastic bottle. Although both have advantages and complement each other, they do not. Trademark printing. More independent than screen printing, it is mostly the direction of investment for small and medium-sized enterprises.
Because the investment of unit type flexographic printing press is too large, it is difficult for small and medium-sized self-adhesive printing enterprises to bear. Therefore, most of the flat-press flat or round flat-type self-adhesive label printing machines with relatively compact structure and low price are adopted. Most of these printing presses are modified by a letterpress printing machine. The ink supply mechanism and the printing embossing mechanism are more complicated than the unit type flexographic printing machine, and the operation is also troublesome. To ensure high quality, the skill level of the operator is crucial. Now I will make a rough analysis and discussion of common problems and solutions in the printing process for peer reference.
First, the pressure problem Printing pressure has a great impact on the quality of printing. Maintaining a uniform and constant printing pressure in the effective printing area not only makes the ink color uniform, but also has a small chromatic aberration, and can also stabilize the size of the print. The flat-press type press can obtain a large printing pressure of zui. However, due to its existence, the problem of the flatness of the manufacturing precision plate, and the thickness of the self-adhesive substrate cannot be completely uniform, resulting in uneven pressure, which affects the printing quality. One measure to solve the pressure unevenness is to make a gasket. Where the pressure is small, the lower part of the workbench is padded; one is to appropriately reduce the hardness of the flexographic plate. However, reducing the hardness of the flexographic plate is limited. If the flexural hardness is too low, the geometrical dimensions of the graphic will be expanded outward, making the small font easy to blur. When printing large-area, the problem of printing pressure is not easy to solve. For this reason, we borrow the method used in bronzing, that is, a silicone rubber plate with a 175-line netting and a hardness of 90° on the workbench. This can solve the problem of insufficient exhaust and partial pressure.
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Second, paste fine text such as the number below the eighth font because the fine line spacing is too small, often the phenomenon of ink drying on the top, resulting in the image between the adhesion can not be distinguished, this is mainly because the ink drying too fast. Our company now uses the resin offset ink produced by Shenzhen Ink Co., Ltd., which has higher viscosity, higher temperature, faster ink drying, and printed products are very fine self-adhesive printed matter. . In this case, you should first look for problems from the flexible resin version. Generally, the resin version has a smooth feel on the bottom of the font, and should not be sticky. However, due to insufficient exposure, the bottom of the font is in a soft state, and it is easy to stick to the ink, and the ink accumulates more and dry in the thin line. If it is not used, it will waste the plate. At this time, the resin plate post-treatment liquid can be used, and the post-treatment liquid contains sodium hypochlorite and hydrochloric acid, which can harden the bottom of the word and eliminate the problem of stickiness. Zui's fundamental approach is to find out the exact exposure time and produce a standard resin version. The font is particularly fine. It is recommended to use the copper-zinc plate. The copper-zinc version of the font is not easy to dry, and the font is hard, it is easier to print clear strokes. In terms of the operating environment, care should be taken to reduce the air flow rate. If it does not work, add a suitable slow drying agent to the ink to reduce the drying speed. A relatively appropriate increase in printing speed can prevent excessive drying of the ink.
Because the investment of unit type flexographic printing press is too large, it is difficult for small and medium-sized self-adhesive printing enterprises to bear. Therefore, most of the flat-press flat or round flat-type self-adhesive label printing machines with relatively compact structure and low price are adopted. Most of these printing presses are modified by a letterpress printing machine. The ink supply mechanism and the printing embossing mechanism are more complicated than the unit type flexographic printing machine, and the operation is also troublesome. To ensure high quality, the skill level of the operator is crucial. Now I will make a rough analysis and discussion of common problems and solutions in the printing process for peer reference.
First, the pressure problem Printing pressure has a great impact on the quality of printing. Maintaining a uniform and constant printing pressure in the effective printing area not only makes the ink color uniform, but also has a small chromatic aberration, and can also stabilize the size of the print. The flat-press type press can obtain a large printing pressure of zui. However, due to its existence, the problem of the flatness of the manufacturing precision plate, and the thickness of the self-adhesive substrate cannot be completely uniform, resulting in uneven pressure, which affects the printing quality. One measure to solve the pressure unevenness is to make a gasket. Where the pressure is small, the lower part of the workbench is padded; one is to appropriately reduce the hardness of the flexographic plate. However, reducing the hardness of the flexographic plate is limited. If the flexural hardness is too low, the geometrical dimensions of the graphic will be expanded outward, making the small font easy to blur. When printing large-area, the problem of printing pressure is not easy to solve. For this reason, we borrow the method used in bronzing, that is, a silicone rubber plate with a 175-line netting and a hardness of 90° on the workbench. This can solve the problem of insufficient exhaust and partial pressure.

Second, paste fine text such as the number below the eighth font because the fine line spacing is too small, often the phenomenon of ink drying on the top, resulting in the image between the adhesion can not be distinguished, this is mainly because the ink drying too fast. Our company now uses the resin offset ink produced by Shenzhen Ink Co., Ltd., which has higher viscosity, higher temperature, faster ink drying, and printed products are very fine self-adhesive printed matter. . In this case, you should first look for problems from the flexible resin version. Generally, the resin version has a smooth feel on the bottom of the font, and should not be sticky. However, due to insufficient exposure, the bottom of the font is in a soft state, and it is easy to stick to the ink, and the ink accumulates more and dry in the thin line. If it is not used, it will waste the plate. At this time, the resin plate post-treatment liquid can be used, and the post-treatment liquid contains sodium hypochlorite and hydrochloric acid, which can harden the bottom of the word and eliminate the problem of stickiness. Zui's fundamental approach is to find out the exact exposure time and produce a standard resin version. The font is particularly fine. It is recommended to use the copper-zinc plate. The copper-zinc version of the font is not easy to dry, and the font is hard, it is easier to print clear strokes. In terms of the operating environment, care should be taken to reduce the air flow rate. If it does not work, add a suitable slow drying agent to the ink to reduce the drying speed. A relatively appropriate increase in printing speed can prevent excessive drying of the ink.
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