The basic process for the transfer of laser silver cards is divided into four steps: image processing and plate making, electroforming and imposition, micro pressure, and laser processing.
(1) Image processing and plate making are mainly based on the optical principle to take pictures of the desired light column pattern quickly. A photoresist of 1.5 to 2 μm is coated on the glass plate of photoresist (prepared in advance), and laser exposure is performed according to the design pattern. The non-laser exposed photoresist is washed away with developer to leave photolithography lines.
(2) Electroforming is the process of spraying silver on the developed photoresist glass master surface to make it conductive, and then electroforming the electroformed silver plate into an electroforming bath to form a wire master (thickness is about 300 μm). Imposition is the use of the imposition machine to make the small version into a large version, and then repeat the process 5 to 7 times to make a big master.
(3) Micro-pressure is usually divided into hard pressure, soft pressure, UV curing, and composite molding. The main features of hard pressure are embossing after aluminum plating. The pressure roll has higher hardness and higher pressure. The main feature of soft pressure is aluminum plating after embossing. The hardness of the pressure roll is low; UV curing is at the same time of molding The UV resin is cured so as to set the texture; the composite molding is used by any of the above four methods, but generally has poor results and is rarely used in normal production.
(4) Laser processing includes coating, transfer, and slitting. Coating is special coating on the aluminum plating surface or film surface of the material; transfer means that the OPP film, PET film is coated with aluminum, silver, zinc sulfide, and selenium oxide on the film surface through a vacuum vapor deposition aluminum machine and will be plated. The film surface and the transfer bottom paper are compounded and then peeled by transferring the glue so that the aluminum layer on 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 OPP film transfer laser silver card, PET film transfer laser silver card is regarded as the printing industry paper environmental protection products, a new masterpiece? The main reason is that the transferred laser silver card is compounded and then stripped by the aluminum layer that has been deposited on the film surface and transferred glue. The pattern of the aluminized layer on the film surface is completely transferred to the surface of the paper, resulting in a plain surface and laser beam effect. The OPP film and PET film, which are not easily decomposed spontaneously, are peeled off, and there is a clear difference between the composite light-beam laser paper (the composite light-beam laser paper is composed of paper and OPP film, and the PET film is compounded with glue, and the plastic film is not easily decomposed). The transfer of laser silver card paper can be naturally decomposed into organic matter, which has no impact on our living environment.
Puzzle breakthrough
Through the above-mentioned production process, a piece of sheet-transferred laser silver cardboard is manufactured in this way. Other paper jams of different colors are made by vapor-depositing different metal materials, and the production process is probably the same as that of a silver card. However, in the production process, due to the impact of the film platen roller, the finished laser paper will be restricted by the plate distance (the current industry is still unable to produce a non-version plate). So, how to make the sewing thread more fine? Jinjia Group affiliated company, Toyota Optoelectronics Technology, has developed a cloth light column OPP transfer film, no spelling line transfer laser paper jam. At the same time, OPP film and PET film are used to make transfer cardboard. OPP film transfer cards have better cost performance. Usually, OPP film paper is 400 to 500 yuan less per ton than PET film paper price, which is very important for material procurement cost control.
On this basis, China Toyota Optoelectronics Technology has also developed a positioning special version of the laser beam transfer silver card, cigarette label "Sunshine Jiaozi" on the little panda design is the application of positioning special version of the beam transfer laser silver card.
Key points of production
Transfer paper in offset printing should pay attention to several points: transfer paper in offset printing is easy to drop points, pull ink; transfer paper is prone to paper brightness is high or low, more difficult to control; transfer paper is difficult to match with the general UV oil black , prone to print storm phenomenon; transfer paper color is obvious, need to be constantly adjusted during the printing process.