The “Fo Rong Wang†(soft blue) cigarette bag is elegant and deep in appearance. It is a high-end product in the “Furong King†series of cigarettes. In order to match its distinguished brand positioning, the cigarette pack adopts a thin-type plain laser gold paper with a basis weight of 97g/m2 as a printing material, and uses a light-changing anti-counterfeiting ink, supplemented by gorgeous screen printing color onion, holographic positioning hot stamping and embossing process. .
Original production process analysis
“Furong Wang†(soft blue) The original production process of cigarette packets includes six processes including offset printing , flat concave, and concave and convex. Due to complicated processing technology, long production process and many production operations, the final product qualification rate is very low. After analyzing the types of waste products, the main reason for the decline in the product qualification rate is that the thin paper has large deformation and deformation during multi-process processing, and the overprinting is not accurate, especially for the printing anti-counterfeiting effect and the embossing effect of the registration. It is the key to the problem.
Using a common web gravure printing machine, a new process, a thin reel laser paper gravure combination process, was creatively developed to convert the current multi-process production process into a gravure combination process. In this way, the registration problems, the consumption problems, the production efficiency problems, and the paper stretching and deformation problems existing in the original production process are effectively controlled.
Technical breakthrough in gravure combined process
In order to realize the thin roll laser gravure combination process, the technical breakthroughs are mainly made from the following three aspects.
1. No seam high gloss web laser technology
(1) The problem of seaming of reel laser paper. There are still obvious seams in the plain roll laser paper samples provided by the initial paper suppliers. However, through the use of seamless laser electrochemical aluminum technology and after many experiments, the company has developed a non-plate spiral paper.
(2) The problem of brightness of the roll laser paper. At the same time as the problem of colliding the laser paper seam of the reel, a new problem appeared - the brightness of the laser paper was significantly reduced. In response to this problem, the technicians have improved the laser molding plate, the transfer film, and reduced the number of working rolls of the transfer film after many experiments, and finally developed a high-gloss web laser that meets the quality requirements.
(3) Tensile strength of the roll laser paper. To ensure accurate overprinting during gravure printing, the paper must be run under constant tension throughout the printing process. This requires that the roll laser paper has a certain tensile strength and can not crack or the like, otherwise it will cause tearing of the roll laser paper during the printing process, especially the tensile strength of the thin roll laser paper is particularly important. .
(4) Gravure registration technology for non-stitched reel laser paper. Due to the high gloss of the 97g/m2 thin plain laser gold paper, the electric eye on the gravure printing machine cannot stably recognize the reflected light signal of the registration cursor printed thereon, thus causing the registration system to be unstable during the printing process. Through the cause analysis, we designed a special 97g/m2 thin plain laser gold paper that can meet the gravure registration requirements, and finally realized the stable work of the gravure register registration system.
2. The technology of reducing the offset printing and screen printing process by the web gravure printing process
(1) Breaking through the differences between the three types of printing inks. In addition to the large difference in hue, the three types of inks, such as web gravure ink, offset ink and screen printing ink, are environmentally friendly, dry, adhesive, abrasion resistant, high temperature resistant, and hot stamping. There are also some differences in performance and other aspects.
(2) Breaking through the differences between the three printing methods.
3. Thin paper gravure on-line pressing and concave-convex technology
(1) Complex pattern pressure balance technology. The pattern of the concave and convex embossing of the cigarette is relatively complicated, and it is applied to the thin paper, and the technique of pressing the concave and convex is extremely difficult. After many experiments, the technician finally determined the parameter values ​​of the pressure bumps of each unit of the pressure-concave roller, and realized the pressure balance of the 24 joint products.
(2) Anti-dislocation and limit technology of pressure bump roller. In the process of embossing, the uneven pressure on both sides of the embossing roller, the misalignment of the male and female plates, and the jumping between the two rollers can cause the paper to rupture. The technician has perfected the “toothed roller pillow†through repeated tests. ", to overcome the key technology of thin paper on-line pressing.
　　 The above content is selected from the 4th issue of 2011, Printing and Printing , Packaging and Decoration, and more journal content, please pay attention to the journal channel.
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