Printing factory metal sign screen printing, for example

Printing factory is metal plate printing example of handwriting line width at 0. 2 mm, not too high dimension accuracy requirement raised ( The texture bumps) Corrosion sign, screen printing method and photographic method, compared with graphic transfer quickly, basic does not need to repair, etc,. . . - - - - - - > printing factory is metal plate printing example of handwriting line width at 0. 2 mm, not too high dimension accuracy requirement raised ( The texture bumps) Corrosion sign, screen printing method and photographic method, compared with graphic transfer quickly, basic does not need to repair, etc, and choose the appropriate printing material ( Such as alkali soluble printed material, thick paint material, etc. ) , can shorten the time of the dry and back cover, improve production efficiency. ( 1) Substrate surface treatment copper base and iron base materials in dilute sulphuric acid to remove surface oxide layer, irrigate with flowing water, printing after dry. Aluminum material generally in hot sodium carbonate solution recede oil, printing after washing to dry, remove the oil also can use organic solvent or detergent. Metal base plate if there is a serious ma pit, scratch, oxidation spot, usable mechanical polishing or brush light means of processing lines, then carries on the oil removal. ( 2) Printing ink used in corrosion sign printing graphic transfer printing ink generally adopt resist ink, it has good film-forming, easy to dry, optimum printing force, good resistance to corrosion, remove is convenient wait for a characteristic. Choose the corrosion resistance of metal printing ink, sold ( 3) Printing process will be in dealing with a good base material on the way of printing ink is manual printing and mechanical printing, printing, semi-automatic and fully automatic printing machinery. Printing process parameters as: silk screen mesh 220 - 230 mesh; Shaw hardness 50 - 60 degrees; Network distance ( Screen and face apart) 3 - 5mm; Wide size than grain 20 - 30mm。 Select polyurethane rubber scraper and silk screen print to 60. A 75 Angle of scrapping printing. Will fall one silk screen printing ink from one end of the plate on the other end, ink from the mesh plate leak to the workbench face trial on board ( Test the thickness of the board and printing materials needed for the same) , check the show the printing effect, found that the problem handled in time, if no problem, can locate. Due to the size of material is greater than the graphic size 100 mm or so commonly, so positioning way is very simple, usually in the workbench face distance by about 5 mm in two perpendicular lines, the two straight lines general picture on the left side and your side, when put on board as long as the two lines as the substrates of printing position, it can be normal operation. Printed substrate experience, after drying, corrosion. ( 4) Printing factory introduces corrosion of aluminum liquid formula for signs of corrosion: operation: first iron trichloride as 0. 80 - 0. 81 g/ml solution, copper sulfate, dilute to 0. 90 - 0. 97 g/ml aqueous solution, and then by volume than the latter than the former one is 3:7 mix, reoccupy water dilute to 0. 89 - 0. After the 90 g/ml, zui in sulfuric acid. Etched in the agitator etching machine in general. Etching depth according to the size and weight of grain line, with no deformation for the principle, general at 0. 05 - 0. About 8 mm. ( 5) Punching etched sign need to punch the screw hole, hole, blind hole, etc. , in order to avoid the process behind the damage the appearance of oxide film and quality. ( 6) Back in addition to the front of the protective film speak several kinds of screen printing anticorrosive ink can be in 3% naoh aqueous solution rid of heating at 70 ℃, organic solvent can also be used in addition to the back.