In the plate printing process, a pattern is often used to print the background color once, such as securities, trademarks, decorative prints, etc. The specifications of these products are different, and the number of prints is also very different, but the shading plate can often be used universally. Therefore, save the old printing plate for reuse and give full play to its maximum effectiveness, which is of positive significance for improving economic efficiency and enhancing the vitality of relief printing.
Due to the limitation of the number and specifications of some products, it is often necessary to use small-size paper for printing and re-make a shading plate of a corresponding printing size, which is completely unnecessary, because there are old versions that can be used. Some printing houses often cut 8-back plates into 9- or 12-open, or even smaller format for printing. Although this is more cost-effective for a while, it saves you the trouble of creating a new version. However, you ca n’t print a large layout on the old saved small layout, so you have to make a new large layout. Therefore, the use of "cutting method" to achieve large-format printing small format will inevitably increase production costs and cause unnecessary economic waste.
In view of this situation, through in-depth exploration and practice, we changed the traditional production method and innovated and improved the printing process technology of "big version and small printing", which not only kept the old shading version specifications unchanged And effectively save money. When transferring a format that is smaller than the original specification, the necessary "strain" measures can be used to prevent the excess layout from being stained with ink or touching the packaging lining, ensuring normal printing and receiving good printing results.
According to the theoretical concept and practical results of printing "three flats", printing plate flatness is the basic requirement for accepting uniform inking and meeting uniform printing pressure. Then, as for the thin solid resin plate with soft texture, as long as the "conventional" is broken in the pad link in the sticky plate, the extra edge of the plate can be sunk, and the ink roller can not get the ink, nor the impression marks , No damage to the packaging lining. As for the layout that needs to be printed, as long as the layout is properly padded, uniform inking can be achieved and the normal embossing conditions can be met. It can be seen that from the principle of printing "three flats", the assumption of breaking the condition of printing plate flat in printing "three flats" can be extended, thus providing theory and practice for the implementation of the process of abnormal printing "large plate small printing" in accordance with. Based on the above concept, the idea of ​​implementing the new technology of "big version and small printing" without cutting the board was produced. Through bold practice, the initial results were achieved in production.
For example, the product of 26cm × 18cm is to be printed on the printing plate (shading plate) with the size of 39cm × 27cm, 8-open (format). In order to keep the original format completely, you should first cut a piece of white paper with a size of 26cm × 18cm of 35Og / m, and stick it with the corresponding area of ​​double-sided tape on the back of the 8-open shading version (two vertical and horizontal) Just align the edges), then use a double-sided adhesive tape of 39cm × 27cm format to directly bond the back of the whole printing plate (including the part of the whiteboard) to the plate holder, and then press it firmly. In this way, the layout area of ​​26cm × 18cm width is obviously higher than that of the non-printing layout area due to the additional pad of white paper and a layer of tape, so it can ensure that the printing layout is normally inked and embossed. The unpadded layout is slightly lower, so it is not inked, and there is a certain gap with the surface of the liner, and it does not damage the outer liner. It can meet the printing conditions and requirements of "large version and small printing". Due to the soft and flexible texture of the thin resin plate, through the difference of pads, the purpose of adjusting the height of the plate surface is achieved, and the conditions required for printing are achieved. In this way, it is possible to use the "large format" of the old storage plate to print various small-sized products, to achieve a multi-purpose version, flexible and convenient, and greatly improve the utilization rate of the printing plate.
For many years, the printing method of non-cutting "large version and small printing" has been used to print general-purpose shading plates of various specifications, saving plate-making time, shortening the production cycle, and significantly increasing production efficiency and economic benefits. Because the process is simple, the operation is fast, and the printing effect is good, the customer is satisfied.
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