The process of color printing flexible packaging version of roller

Current color printing flexible packaging industry largely use gravure printing process, gravure printing is a direct printing method, it will be contained in the pits of gravure printing ink embossed directly onto substrates, print the picture by shading level is determined by the size and depth of the pit. The version of the roll is the carrier of color printing flexible packaging gravure. In view of the production process version roller, below small make up for everyone to do a simple introduction. 1, version roller matrix production version of the roller matrix material for steel pipe commonly, the reason is that steel prices are low and sturdiness. Weight from 10 kg ( Packaging gravure) To hundreds of kilograms ( Publishing, the building materials gravure) , some of them according to the requirements of the printing quality can weigh up to 1 ton. Packaging gravure in recent years is the aluminum material version roller, especially recently adopted plastic version of roller. Steel tube wall thickness from 20 mm to 30 mm, large size version of roller is more thick. Version of the roller is divided into no shaft ( Mainly packaging gravure) And there are axial. 2, version of the roll copper plating in either version roller base material ( As long as can meet the requirements) Will be in his new processing version of roller surface plating copper on the bottom. The bottom copper layer is not used for carving or corrosion of the copper layer, but is used to implement version of accuracy of roll, for example, require version roller tolerance within 10 microns in diameter, the parallel degree of less than 10 microns. The thickness of copper layer to around 600 microns. Next on the copper layer covered a layer of corrosion and carving required copper layer, thickness varies between all kinds of plate version roller, generally at about 80 microns. Electric carving technology on occasion must hard copper plating. 3, the production of plate images on version of roller completely after copper plating processing, will be on the version of the roll to produce images, methods are: (1) using corrosion membrane method. Transfer printing or coating on copper layer corrosion film or use carbon paper, photosensitive resin production images; Using Gao Gan resin or black primer to laser formation image, and then through the corrosion film, the use of ferric chloride chemical corrosion. (2) the engraving method. Don't be carved on the copper layer directly. Although has the substitution of alloy layer, resin for copper plating, and to form the image, the method of laser but most of them still in the development process. Version of the roll of the depth of the mesh is formed on general from several microns to 60 microns. Mesh density in the range of 2500 - is normally used 10000 mesh/cm2, and use laser way to further improve the mesh density value. 4, chrome plated treatment after the mesh is formed on the copper layer, even if the finished version of the roll. But in the process of printing ink drops in the mesh on the surface of copper parts, copper surface easy to scraper scratches, so be on the copper plating on the surface of a layer of about 10 microns chrome. At this point, a gravure roller was made. Gravure plate-making technology in prepress digital environment has made real progress in high efficiency. In recent years the technical trend of is full of roll production automation. In the chemical process with laser can make the details better reproduce, if possible, hope to eliminate chemical etching method in the future.