The control of product quality is the core of enterprise management, and cigarette package printing enterprises are no exception. Process design is the forefront of quality control of cigarette packages, and excellent cigarette package design can better support the stability of product quality. Below, the author talks about the quality control of cigarette packages from the perspective of process design.
Image-based process design points
In theory, the richer the image hierarchy, the higher the image resolution, and the better the image rendering. However, in the actual printing process, the reproduction of the image effect is closely related to the color gamut of the printing ink, the smoothness and whiteness of the printing paper, and the dot reduction of the printing device . Therefore, in the process design of the cigarette pack, we must consider these factors in order to make a relatively good cigarette package design. Below, the author will talk about the image design process points from the following three aspects.
(1) The color rendering of printing is actually based on the principle of color reduction. The more colors are overprinted, the darker the color. Therefore, in the design of the cigarette package process, try to use the spot color ink for color reproduction, so that the color of the image presented is more beautiful, avoiding the use of multi-color ink coloring or multi-color superposition process to reproduce the dark tone of the image, if the image is indeed Need to reproduce the dark color, you can use the background color removal process to make the dark tone part, so that the image effect is not too dark, the color saturation will be much better.
(2) Image layer reproduction and image resolution are closely related. The richer the image hierarchy, the higher the image resolution requirements. The reproduction of the image hierarchy is inseparable from the smoothness and whiteness of the printed paper. When the image is rich in layers, 3% to 5% of the dots are not lost, 80% to 90% of the dots are not pasted, the dots are flat, there is no white point inside, and the dots are round and neat. If the smoothness of the printed paper does not reach the required index for dot reduction, the 3% to 5% dot in the highlight layer of the image layer cannot be transferred to the surface of the printing paper, so that the high-definition portion of the image is missing.
In this case, the gradation curve of the image must be adjusted according to the condition of the printed paper, and a plurality of screen line number schemes are proofed to determine which screen line number should be used on the current printing paper. Taking offset printing as an example, in the case of using amplitude-modulated circular dots, the number of screen lines for ordinary printing is 100 to 150 lpi, and the number of screen lines for fine printing is 150 to 200 lpi, and the number of screen lines for cigarette-printed offset images is generally 150 to 150. 175lpi. This is mainly because the design of the cigarette packs is mostly an abstract design, and the real-life images are rarely used. Therefore, the image layer requirements are relatively low, and the cigarette pack printing usually has less than 200 lpi of printed products.
(3) The choice of printing method is directly related to the quality of the image level. At present, the printing methods commonly used by cigarette printing enterprises include offset printing, gravure printing and screen printing. These printing methods have their own advantages and disadvantages. The offset printing process reproduces the image layer better, but the hue stability of large-area solid printing is weak, and almost no special effect printing is supported; the screen printing process can reproduce a variety of special printing effects, but the reproduction effect on the image level is poor; The gravure printing process supports the hue stability of large-area solid printing, and has certain support for image layer and special effect printing. Therefore, in the process design of the cigarette pack, it is necessary to develop strengths and avoid weaknesses, and give full play to the advantages of the above three printing methods. When the design draft requires higher image level, the offset printing process can be used; when the design draft has higher requirements for solid printing, the gravure printing process can be used; when the design draft needs special effects, the screen printing process can be adopted. In fact, in order to reflect the brand value of high-end cigarette packets, cigarette package printing companies often need to use a variety of printing methods to achieve the desired artistic effect.
Process design points based on mass production
The process design of proofing products and the process design of mass production products are different. The former is for bidding, and there are samples. The latter's focus is on ensuring the quality of batch products. Therefore, the process design of the two is certain. The difference. Below, the author briefly talks about the process design points of mass production of cigarette packages.
1. Setting of multi-color overprinting process parameters
Multi-color overprinting is very common in cigarette package printing. For example, seams between color patches or between patches and images. If the overprint parameter setting is large or small, it will affect the overall effect of the cigarette pack. When setting the cigarette printing overprint parameters, the following two aspects are mainly considered.
(1) Differences in printing methods
Offset printing, gravure printing and screen printing are the three mainstream printing methods for cigarette package printing. The registration accuracy is quite different. The setting of the overprinting parameters must be carried out according to the situation.
The manual manual adjustment accuracy of the imported offset printing machine is ±0.01mm, but the registration accuracy in the actual printing is ±0.05mm or more. Among the three printing methods, the registration accuracy is the highest. When setting the offset printing parameters of offset cigarettes, it should be set between 0.05 and 0.15mm according to the requirements of the design draft.
The manual manual adjustment accuracy of the imported gravure printing machine is ±0.02mm, but the registration accuracy is ±0.10mm in actual printing. When setting the overprinting cigarette pack overprinting parameters, it should be set between 0.10 and 0.25mm according to the requirements of the design draft.
The actual registration accuracy of screen printing is relatively low, usually ±0.15mm.
It should be noted that in the actual setting, the larger the overprinting parameter, the better the design effect should be followed. Especially in the design proofing, the relationship must be clarified and the initiative should be mastered. It is more passive when producing cigarette packets.
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