In order to meet the demand for high-quality, long-term and large-volume packaging of Yunnan cigarette trademarks, many printing companies in Yunnan in the early 90s have invested in gravure printing equipment to print cigarette trademarks, forming a craze in the history of printing in Yunnan. In the past few years, we have experienced a process from unknowing to familiarity with the process of gravure printing and quality control. Here we only take some of the company's process improvement projects and quality control procedures as examples for the quality of cigarette gravure printing. Talk about control. (-) Reasonable process design and technical improvement are prerequisites for quality control. Pulling ink and flying ink are the most common quality problems during initial gravure printing, resulting in a high scrap rate. After analysis, the main reason for the ink pulling phenomenon is the material problem of the ink knife itself; the flat state of the printing plate surface; the impure objects in the ink such as coarse particles, foreign objects, etc., lift the cutter partially upward, aiming at the most common third For some reasons, we have added a filter screen to the ink circulation system to achieve filtering before applying ink and filtering during circulation, effectively controlling the phenomenon of ink pulling. Solve the problem of flying ink from the pre-press. First of all, the layout design should not be overfilled, and the best effect is about 75-85% a of the maximum printing width. The second is to improve the chamfering processing accuracy of both ends of the plate roller, reduce the concentricity deviation, and also reduce the phenomenon of flying ink. ; The third printing plate is equipped with hard ink film at both ends to prevent ink splashing. The Honghe cigarette label printed by our company has strict requirements on the hue, and the depth of the printing plate directly affects the hue index. In order to ensure that the hue index is qualified, the printing plate is required to have a certain depth. The smoothness of the deeper printing plate is poor. Although the number of screen threads and the angle of the engraving needle have been adjusted many times, there has been no substantial breakthrough in the smoothness of the printed product. Last year, our company put into use a high-shear emulsifying machine, the ink insists on emulsifying first and then on the machine. During the emulsification process, the ink particles are fully ground, and the ground ink is fine, uniform, and smooth. The flatness is significantly improved after the machine is used, and the ink pulling phenomenon is also significantly reduced. The ink needs to add different colors during the hue adjustment process. Due to inadequate mixing, the phenomenon of uneven ink transfer is easy to occur during printing. Commonly known as white stripe, high shear emulsifier makes the problem of color ink preparation process solved. (2) The establishment of acceptance criteria for key accessories is one of the keys to quality control. Paper surface scratches, moisture level, dustiness; viscosity of original ink, range of hue L, a, b value, printing suitability; water content of solvent, dryness, residual odor; printing plate samples, etc. are listed as me The company's most basic auxiliary materials inspection project. (3) Strengthening process supervision and perfecting statistical records are the intermediate links of quality control. For example, if the reference printing resistance index specified by the printing plate is 1 million revolutions, the printing plate that exceeds the specified number and is still printed will be monitored by the process control department for preventive measures. This will not only control the potential quality factors but also save production. cost. The company has also implemented a system for regularly assessing the capabilities of suppliers through statistical data supervised by the quality control department, and combined with the periodical statistical pass rate of auxiliary materials to select suppliers. (4) Quality awareness is the foundation of quality control. Our company has a leadership team that attaches great importance to quality, and has formulated a quality policy of "people-oriented, advanced technology-led, and advanced management methods as control methods to ensure quality first". A series of documents such as "Gravure Process System Documents", "Process Discipline Documents", "Process Quality Control System Documents", and "Quality Awards and Penalties Regulations" were formulated and implemented, which made the company employees tighten the quality string from top to bottom. Quality workers must be "legal." All in all, the quality awareness, skill quality, reasonable printing process design, equipment performance and auxiliary material performance of employees are all related to the quality of gravure printing. With the development of the gravure trademark printing industry, gravure quality control will still be a long-term issue. We still need to do a lot. Only through continuous exploration and summation can we better grasp the quality of gravure printing and make quality truly a competitive enterprise. Strong guarantee. Has the biggest cooking area, is a ideal size for the large family cooking in the courtyard.
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