Plaster tape is a double-sided adhesive tape, in the flexographic printing in the main play two roles: First, the plate will be fixed in the printing plate roller or its sleeve, to prevent the printing plate in the printing process of warping or displacement, to protect the normal printing process; Second, through the selection of the tape foam core density, to achieve a fine control of printing pressure, in order to match the graphic design of the printing plate, to enhance the effect of printing.
At present, the common domestic paste version of the tape has TESA (Tesa), 3M, Roman (lohmann), Si Kappa (SCAPA). Common thickness of 0.1mm/0.38mm/0.5mm/1.5mm, according to the printing requirements can choose neutral/soft/super soft and super hard several.
Personal experience: narrow vice machine (laminated machine / Donghang / Ouimet / Italian high hair / Og / McAnulty, etc.) is recommended to use the TESA, common models are TESA52015/52017 (0.38mm) TESA4963 (0.1mm) TESA agent in South China, Guangzhou Jiaqi. Advantages: good adhesive, not easy to warp the plate, strong reusability, good stability, affordable.
Disadvantages: not easy to tear the plate. Wide vice machine is easy to produce air bubbles when the lamination is not good.
3M Laminating Tape, common specifications are 3M1015/1115/1020/411DL, Pros: easy to tear the plate, good stability, another 3M-E1015H tape in the wide vice machine and the sleeve type of application is not easy to produce air bubbles, and effectively provide the printing quality.
Disadvantages: Easily warped, poor adhesion. Low reusability.
Roman tape is common in the market is 0.2mm, applicable to letterpress label printing (oblique back / rotary), paste the plate will not produce air bubbles, unloading the plate also has no residue with high temperature resistance, can avoid due to the high-speed operation of the rollers to avoid the heat of the plate after the plate shifting or warping of the plate problem
3 application notes
Foam type of laminating tape for the lamination effect Depends on each step in the process of paste plate, the correct use of paste plate tape can make the printing quality of flexographic printing has been significantly improved. Therefore, the varnish, in the use of foam class plate tape, should pay attention to the following points.
(1) temperature on the use of the plate tape has a greater impact, so all operations on the plate tape should be carried out at room temperature, to avoid because of temperature reasons and affect the adhesive force of the plate tape.
(2) The surface of the printing plate and plate cylinder (or plate sleeve) should be kept clean before applying the plate. This is because dust, rust, ink and other dirt will destroy the adhesive force of the paste plate tape, which will lead to poor adhesion of the printing plate, and the phenomenon of warping. It is advisable to use a high concentration of alcohol to clean the plates and sleeves, as other chemical solvents may cause corrosion of the plates and sleeves.
(3) paste the plate, paste the area of the tape should be larger than the area of the plate, that is, paste the edge of the tape should be larger than the edge of the plate Epson, which can greatly reduce the risk of warping.
(4) paste the plate, the interface of the printing plate should avoid the interface of the paste plate tape. If the interface of the printing plate is facing the interface of the pasteboard tape, it is easy to lead to the interface of the printing plate paste is not secure, there is a warped plate or even the phenomenon of the plate off.
(5) in the printing plate cylinder or paste plate sleeve surface paste paste plate tape, it is recommended to use the scraper instead of hand crushing paste plate tape printing suitability, this is because relative to the operation of the hand, the scraper can be on the paste plate tape to exert more pressure, so that the paste paste the tape to better fit in the printing plate cylinder or paste the surface of the plate sleeve, and at the same time, effectively avoid the generation of air bubbles; in the paste paste the surface of the tape paste printing plate, it is recommended to use a softer rubber tape, the rubber tape is recommended to use a softer rubber tape. It is recommended that a softer rubber roller be used instead of crushing the plate by hand in order to better fit the plate, drive away air bubbles and protect the fine dots on the plate surface.
(6) after the plate paste, in order to avoid printing and cleaning ink and solvent contact to the edge of the plate adhesive, thus affecting the adhesion of the paste plate tape, should be in the printing plate around the paste a circle of sealing tape, which can also avoid the printing plate to appear warping phenomenon of quality control, the thickness of the sealing tape in order to thin as appropriate.
(7) unloading the plate, it is recommended that the plate is unloaded slowly and smoothly at an angle of less than 90 ° (the tangent angle between the plate and the surface of the plate cylinder or the plate sleeve), so as to avoid the plate wrinkles or rupture. The slower the unloading speed, the weaker the peeling strength of the plate on the laminating tape; conversely, the faster the unloading speed of the plate slitting, the stronger the peeling strength of the plate on the laminating tape. When unloading the plate tape, the same method as unloading the plate.