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FLEXO Magazine : December 2011
Conventional anilox cup geometry creates aeration and turbulence within the ink fluid at doctoring. Ink can “mist” or “spit” after doctoring Deep conventional anilox cells trap ink while cell wall surface mass reduces ink area, thus inhibiting reliable ink replenishment. GTT channels are 40-60% shallower and land mass is reduced by 66% for greater ink surface area. Since the channels are narrower than hexcells, greater dot support is delivered. GTT slalom channels reduce ink stress at the doctoring phase for a more controlled ink-to-plate transfer. iNk vESSEl GEOmETRY COmPARiSON BLADE DIRECTION CROSS-SECTiON OF ANilOX ANilOX SURFACE PRINTING PLATE iNk DOCTORiNG ChARACTERiSTiCS COmPARiSON CROSS-SECTiON OF GTT BLADE DIRECTION PRINTING PLATE GTT SURFACE iN k -TO-PlATE TRANSFER Ch ARACTERiSTiCS COmPARiSON GEOMETRYGTT SlA l O m iNk ChANNEl GEOm ETRY imPROvED hYDRAUliC FlOw SETS YOUR iNk FREE Smooth operator. In another first, Apex employs a new low-power, high-efficiency laser engraving process to eliminate the problems of rough, uneven ceramic recast caused by the unavoidable jackham- mer effect of conventional pulse lasers creating closed cells. Because our laser is always “on,” the walls and floor of the ink channels created by the laser ablation are consistently smoother and more uniform. Count on superior ink release. Competitor YAG pulse laser leaves uneven recast throughout the cell engraving. Inferior channel surfacing results from pulse laser engraving. Competitor pre- engraving porosity of conventional ceramic layer typically ranges from 2% to 15%. Constant Beam laser technology surgically removes the ceramic, revealing smooth and even channels time after time. Apex ultra-dense ReleasAll v1500 ceramic porosity is less than 1% before engraving. 80/20 molecular hybrid ceramic lowers surface energy for better ink release. REiNvENTi NG INK TRANSFER LASER ENGRAVING CERAMIC C ONSTANT BEAm l ASER ENGRAviNG ABlATiNG A CONSiSTENT, PRECiSE ChANNEl RElEASAll v1500TM hiGh-DENSiTY NON-wETTiNG CERAmiC SUPERh ARD hYBRi D CERAmiC TROUNCES POROSi TY CERAmiC POROSi TY COm PARi SON Real slick. Real hard. GTT’s “non-wetting” hybrid ceramic composition – ReleasAll v1500 – is for- mulated to provide the highest-density, hardest and most ink-repellent surface layer available. While con- ventional ceramic is 99% pure Chromium Oxide (CrO2), our GTT hybrid uses 80% pure CrO2 and adds 20% Titanium Dioxide particles to lower the ceramic’s surface energy. Structural pores and voids all but vanish to produce an ultrahard layer (1500 Vickers rating) that controls and releases ink like no one else. Count on easier cleaning, greater score-line and damage resistance, not to mention near-complete ink release. ENGRAviNG l ASER BEAm APPliCATi ON COm PARi SON INSIDE FOLDOUT COVER: FOLD INSIDE FOLDOUT COVER: FOLD SPINE/BINDINGEDGE Surface Geometry Ceramic Composition Laser Engraving 1 1 2 2 3 3 ThREE INNOvATIv E fEATURES DEfINE T h E GTT REv OLUTION IN INk mETERING: let it flow. The breakthrough idea behind the GTT revolution is our patented open slalom channel surface geometry which finally enables a precise hydraulic method for metering ink onto your plate. With GTT, because the ink now flows into a precisely-engineered curved channel and is no longer captured and trapped in a confining cell, less blade and plate pressure is required for the ink to release to the printing plate. Thus you gain more efficiency and control over your entire inking process, including subsequent plate-to-substrate transfer. iNk “STRESS REliEF” The elimination of closed hexcell cups means ink turbulence and aeration (known as “ink stress,” “pressurization,” or “foaming”) are relieved, resulting in a far more controlled and complete ink-to-plate transfer. Stressed ink is unpredictable ink. iNk REPlENiShmENT With GTT, pressurised ink no longer “explodes” out of the doctor blade chamber as it does with 60° hexcell anilox, no matter the depth or extended length of the hexcell. Nor is air trapped into hexcells as the roller surface re- enters the blade chamber to be re-inked. GTT slalom channels give ink and air an “escape route” that enables calmed ink to release and replenish more completely, giving you repeatable results over long press runs. TRANSFER TO PlATE Furthermore, GTT’s open-ended channel design removes 66% of the non-inked cell-wall “land” area of a conventional anilox design meaning still more ink surface area is evenly exposed to the plate, thus maximizing uniform plate inking. What’s more, GTT open channels are narrower in width than closed hexcells for greater dot support on finer screens. ShAllOw ChANNElS Since the GTT open channel is 40-60% shallower than a conventional hexcell cup, the ink achieves more complete release from the roll surface. Thus less ink volume and lower viscosities are required at the critical kiss- point of ink-to-plate transfer, meaning you may run thinner inks while achieving amazing density on solids and dots. Also minimized are mottling, pinholing and dot gain. Shallower GTT slalom channels enable ink to flow along the blade path, reducing stress. The ink itself encounters no blockages along the blade path and thus emerges from the chamber in a “calmer” state. Stressed ink and cell land areas create uneven plate inking in conventional geometry, forcing ink up between plate dots and remaining within the cell cups. GTT open geometry allows calm, consistent ink transfer. Less aeration, shallow and narrow wavy channels, and thinner land areas all serve to deliver ideal ink volume to plate. APEX Covers-Flaps 11-11.indd 2 12/2/11 2:08:01 PM