The paper used for the tobacco label "Honghe Boutique 88" is the new materials to be introduced below-OPP film transfer laser silver card, PET film transfer laser silver card (Before this, the Nanjing Lingshan Century Edge tobacco label has also been produced, but from technology, Quality and output are not very mature).
The transfer laser card produced by OPP film and PET film can be regarded as a new good product among the environmental protection materials of cigarette labels, which not only meets the laser anti-counterfeiting effect of composite laser paper produced in the current industry, but also in the development process of printing environmental protection materials A very important step was taken. Whether it is the production process of paper manufacturing or the production process of offset printing to make cigarette labels, there are many new improvements in technology and the integration of new elements.
Basic process
The basic process of transferring laser silver card is divided into four steps: image processing and plate making, electroforming and imposition, micro pressing, and laser processing.
(1) Image processing and plate making mainly take photos of the required light beam pattern through optical principle, apply 1.5 ~ 2μm photoresist on the photoresist glass plate (can be prepared in advance), and perform laser exposure according to the design pattern. Use a developer to clean the photoresist that has not been exposed to the laser, leaving a lithographic pattern.
(2) Electroforming is the process of spraying silver on the surface of the developed photoresist glass master to make it conductive, and then putting the electroformed silver plate into the electroforming bath to electroform into a wire master (thickness about 300 μm). Imposition refers to the process of assembling a small version into a large version using an imposition machine, and then repeating the procedure 5 to 7 times to make a large master.
(3) Micro-pressing is usually divided into hard pressing, soft pressing, UV curing and composite molding. The main feature of hard pressing is aluminum plating followed by embossing, the pressure roller has higher hardness and greater pressure; the main feature of soft pressing is embossing followed by aluminum plating, and the pressure roller has lower hardness; UV curing is to mold while pressing UV resin is cured to shape the texture; compound molding is to use any of the above four methods to share with each other, but usually the effect is not good, and it is rarely used in normal production.
(4) Laser processing is divided into coating, transfer and slitting. Coating is the special coating of the aluminum or film surface of the material; transfer means that the OPP film and PET film are coated with aluminum, silver, zinc sulfide, and selenium oxide on the film surface by a vacuum vapor deposition aluminum machine, and the plating is done The film surface and the transfer base paper are compounded and removed by transfer glue, so that the aluminum layer of the film surface is completely transferred to the paper surface; the slitting is mainly based on the width and length required by the customer.
Product advantages
Why are OPP film transfer laser silver cards and PET film transfer laser silver cards regarded as new masterpieces of paper environmental protection products in the printing industry? The main reason is that the transfer laser silver card is compounded and peeled off by the aluminum layer that has been vapor-deposited on the film surface and the transfer glue. The pattern of the aluminum coating on the film surface is completely transferred to the paper surface, forming a plain surface and a light column laser effect. The OPP film and PET film that are not easy to decompose naturally are peeled off, which is obviously different from the composite beam laser paper (the composite beam laser paper is composed of paper and OPP film and PET film through glue, and there is a plastic film that is not easy to decompose). The transferred laser silver cardboard can be completely decomposed into organic matter, which has no effect on our living environment.
Difficult breakthrough
Through the above-mentioned production process, one by one transfer laser silver cardboard is thus produced. Other different colors of cardboard are made by vapor deposition of different metal materials, and the production process is about the same as that of silver cards. However, due to the influence of the film platen roller in the production process, the finished laser paper will be restricted by the plate distance (at present, it is not possible to produce plate-free stitched plates). So, how do you make the stitches thinner? Sino-Toyota Optoelectronics, a subsidiary of Jinjia Group, has developed a cloth patterned light column OPP transfer film and a non-stitching line transfer laser jam. At the same time, OPP film and PET film are used to make transfer card paper. The transfer card made of OPP film has better cost performance. Generally, the price of OPP film paper is 400 to 500 yuan per ton lower than that of PET film paper, which is very important for the cost control of material procurement.
On this basis, Sino-Toyota Optoelectronics Technology has also developed a positioning special edition light column transfer laser silver card. The red panda pattern on the cigarette label "Sunshine" is an application positioning special edition light column transfer laser silver card.
Production points
The transfer paper should pay attention to several points in offset printing: transfer paper is easy to drop and draw ink during offset printing; transfer paper is prone to high or low paper brightness, which is difficult to control; transfer paper is difficult to match the general UV oil black , Prone to print color burst phenomenon; the color difference of the transfer paper is obvious, and it needs to be adjusted continuously during the printing process.
In summary, the successful development of a new type of material also requires continuous improvement and improvement of production technology, and at the same time, each production link should be controlled very carefully and meticulously. Since transfer paper has very strict production technical requirements, especially in the production of new version of transfer film, vapor deposition of aluminum layer, film pressure of light column pattern, selection of transfer glue and its slitting plate distance, these factors directly affect the printed matter The effect and quality of mass production are stable.
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