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FLEXO Magazine : November 2010
Technologies & Techniques eliminate them is the solution. For unsupported film, it is imperative to have a closed loop tension system for your lamination to control curl. 4. Ink type not a laminating ink. It is crucial that the ink is a laminating ink, and, not have any wax or silicones in it for proper adhesion of the lamination to the ink and substrate. 5. Testing and monitoring the film and lamination is not a requirement, but is a very good way to diagnose an issue. If dyne level of the film is below 36, then the date of substrate and dyne levels should be checked, docu- mented, and analyzed. 6. Green bond strength. A peel tester can test the prod- uct’s green bond strength, right off the press, and then after post-cure. This is done by giving it a numerical value to document and gauge the product’s green bond strength. Typically, a minimum of 75 to 100 grams is required directly off the press. This usually increases 50 to 100 points after a 24-hour post-cure. Anything more than 200 grams is where the lamination begins to become destructible, meaning that the lamination bond, while not peel-off, tears or destroys the films. It is bet- ter to wait to slit the film until after it has post-cured 24 hours. Slitting it any earlier, could tear and delam part of the bond, if the green bond strength registers 100 and less on the peel tester. Most companies do not have the budget to purchase a peel tester. Manually checking the product during setup and after each roll can help. 7. Delaminating. This is where the lamination delaminates itself from the substrate after time. This has multiple issues and varies by the type of substrate lamination, adhesive, ink etc. Testing and proper documentation and getting suppliers involved is how you overcome this. Coated and Uncoated Stock. How is the surface tension of the coating? Is the surface tension of the coating correct for the type ink you are printing with? How does it react and transfer when you print? What about at higher press speeds? Take, for example, an uncoated stock like vinyls. If you tried to print on it without a primer, you would not get proper adhe- sion and the printability of the substrate is horrific. You can send the ink company a small roll so that it can modify the ink formula for better adhesion and flow characterization, but it is a special ink that will cost you more and should only be run on that particular stock. A coating can achieve the same thing, but you need to make sure that the type ink will work on that coating. Corona Treater. Is it working properly and is it properly cleaned and maintained on a regular schedule? Is the printer trained properly on the operation of the unit? When trying to diagnose an issue, the dyne levels should be tested on film before and after corona treatment, and then on the lamination, to establish if it is a film or lamination issue that is occurring. Typical film comes in at 36 to 38 dynes, and corona A good housekeeping system can help ensure maximum press speeds. 92 FLeXO november 2010 www.flexography.org 600m/min HIGH SPEED FLEXO PRINTING ©EN03/10HP-RANGE Leading edge innovation in flexographic printing • P2P®: dynamic adjustment system controls printing pressures • PCT®: Press Control during Transition • PTC®: Predictable Torque Control • SprintWash®: new automatic washup system • FlexoSmartPackHP®: Uteco engineering platform for improved performance and profitability in flexographic printing • ShopWare® Production Management, Control & Monitoring: easy machine-operator interface to manage productivity • LogiPack®: automatic handling of reels and cores • Print configurations: 8 or 10 color • Maximum print speed: 600 m/min • Printing widths: 1000 to 1700 mm • Print repeat range: 350 to 1250 mm • High productivity machine • Reduced job changeover times • Innovative and dynamic machine design • Consistent return on investment firstname.lastname@example.org • www.uteco.com UTECO CONVERTING SPA • I 37030 COLOGNOLA AI COLLI (VR) • PH.: +39 045 6174555 • FAX: +39 045 6150855 And a new innovation is coming... GENETIC INNOVATION Uteco North AmericA • 3400 t owN PoiN t Drive, SU ite 160 • KeNNe SAw, GA 30144 • Ph : 770 427 4100 F: 770 427 4872 email@example.com • www.uteco.com FLX_May10_sec1.indd 33 4/17/10 11:06 PM Keep your Calendar Open the Week of November 16–18 , 2010 The Diamond HP 808 will be available for printing demonstrations at the Uteco North America Open House, to be held in 3400 Town Point Drive Suite 160, Kennesaw, Georgia, 30144 Uteco_OHad_mech.indd 1 7/15/10 9:36 AM FLX_Nov10_mech.indd 92 11/1/10 2:27 PM
Sustainable Fall 2010