Self-adhesive label is a kind of material which is widely used in many aspects such as life, work and so on. There are many kinds of non-adhesive stamping processes. Next, I will briefly introduce them.
The bronzing method is divided into sheet paper bronzing and roll paper bronzing according to the processing method of the sticker label. Single sheet paper gilding process is the same as traditional gilding process, which is processed on special gilding machine. Roll paper stamping is accomplished on label linkage and is a widely used processing method. At present, there are several ways of bronzing drum materials:
(1) Flat-pressing and gilding relief label printing machine on label machine, whether flat-pressing or round-pressing equipment, because of the intermittent feeding of web paper, the flat-pressing and square-pressing method is used for all gilding. Generally, the stamping station is an independent unit, and some models share a unit for stamping and die cutting, which is used separately.
(2) Multi-station flat stamping has two-station stamping units in some models, such as SMHC-45-MWL label machine in Shiki, Japan. One unit is close to the plate to complete horizontal stamping, and the other unit is independent unit to complete vertical stamping. The machine can be used for two-color bronzing at the same time.
(3) The flat pressing and stamping machine on the processing machine is specially designed for the processing of printed drum labels and labels that do not need to be printed. Hot stamping is a function of the processing machine. Flat pressing and square pressing are commonly used in the stamping device on the processing machine. Its working principle is the same as that of the label machine mentioned above.
(4) The gold plate used for round pressing and gilding on the rotary machine is in the shape of a cylinder. When gilding, it contacts with the impression cylinder to realize gilding. Round stamping is suitable for continuous paper feeding wheel transformation label machine, but it has certain requirements for paper feeding speed, that is to say, it has an impact on printing speed. But compared with flat stamping, it greatly improves the efficiency. Because of the high manufacturing cost of round pressing and gilding roll, it is only suitable for long-plate live gilding.
_Cold stamping on the rotary machine is a new technology of stamping. It no longer uses the heated metal plate, but uses the method of printing binder to transfer the metal foil and realize stamping. 工艺流程是：在印品需要烫金的位置先印上UV压敏型粘合剂，经UV干燥装置使粘合剂干燥，而后使用特种金属箔同压敏胶复合，再剥离金属箔，于是金属箔上需要转印的部分就转印到了印刷品表面，实现冷烫金。 Cold stamping process has the advantages of low cost, energy saving and high production efficiency. It can make use of existing equipment and components without adding additional devices. It is a new process with great development prospects.