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FLEXO Magazine : June 2012
SPINE/BINDINGEDGE 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. Let it flow. The breakthrough idea behind the GTT revolution is our patented Open Slalom ink Channel surface geometry which finally enables a precise hydraulic method for metering ink onto your plate. With GTT – because 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 ink to release to the printing plate. Thus you gain more efficiency and control over your entire inking process. INK STRESS RELIEF The elimination of closed hexcell cups means ink turbulence and aeration (also known as “ink stress,” “pressurisation,” or “foaming”) are relieved, resulting in a far more controlled and complete ink-to-plate transfer. Stressed ink is unpredictable ink. GTT reduces over- inking of printing plates due to the excessive plate pressure required in conventional anilox to draw the more viscous ink from the hexcells. TRANSFER TO pLATE GTT’s open-ended channel design removes more than 60% of the non-inked cell-wall “land” area of a conventional anilox design which means 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. SHALLOW CHANNELS Since the GTT open channel is up to 30% shallower than a conventional hexcell cup, the ink achieves more complete and consistent release from the roll surface. Typically, less ink volume and lower viscosities are necessary at the critical kiss-point of ink-to-plate transfer.Thus thinner inks can often be employed while achieving amazing density on solids and dots – even at high speeds on long runs. Also minimized are mottling, pinholing and dot gain. INK REpLENISHMENT With GTT, pressurised ink no longer “explodes” out of the doctor blade chamber as it does with 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 more predictable results. FEATu RES REINVENTING ink Transfer Geometry GTT Open Slalom Ink Channel Geometry Improved Hydraulic Control Sets Your Ink Free INK VESSEL GEOMETRY COMpARISON Deep conventional anilox cells trap ink while cell wall surface mass reduces ink area, thus inhibiting reliable ink replenishment. GTT channels are up to 30% shallower and land mass is reduced by more than 60% for greater ink transfer surface area and replenishment. GTT slalom channels reduce ink stress at the doctoring phase for a more controlled ink-to-plate transfer. BLAdE diRECTiOn INK DOCTORING CHARACTERISTICS COMpARISON At doctoring, conventional anilox cup geometry creates aeration and turbulence within the ink fluid at the cell’s end wall. Ink can “mist” or “spit” after doctoring, especially at high speeds. GTT enables ink to flow within the shallower slalom channels along the blade path, reducing stress. The ink encounters no blockages along the blade path and emerges from the chamber in a “calm” state. CROSS SECTiOn OF AniLOX BLAdE diRECTiOn GTT SURFACE BLAdE diRECTiOn INK-TO-pLATE TRANSFER CHARACTERISTICS COMpARISON Stressed ink and cell-wall land areas create uneven plate inking in conventional geometry, forcing pressurised ink up between plate dots and remaining within the cell cups. GTT open geometry allows calm, consistent ink transfer. Shallow, narrow, wavy channels and thinner land areas all serve to deliver an ideal and calmed ink volume to plate. pRINTING pL AT E CROSS SECTiOn OF AniLOX pRINTING pL AT E GTT SURFACE Revolution Revolution TRANSFERRED INK TRANSFERRED INK Learn how these three key innovations define the GTT revolution in ink metering: Surface Geometry Ceramic Composition laser Engraving 1 2 3 Ceramic High-Density Non-Wetting Ceramic Superhard Hybrid Ceramic Trounces Porosity Real slick. Real hard. GTT’s “non-wetting” hybrid ceramic composition is formulated to provide the highest-density, hardest and most ink-repellent surface layer available. While conventional ceramic is nearly 100% 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 – at 1500 Vickers rating – that better controls and releases ink. Count on easier cleaning; greater score-line and damage resistance; not to mention virtually- complete ink release. Pre-engraving porosity of conventional ceramic layer available in the market may vary from 2% to 5%. Apex ultra- dense ceramic porosity is less than 1% before engraving. 80/20 molecular hybrid ceramic lowers surface energy for better ink release. CERAMIC p OROSITY COMpARISON Laser 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 “jackhammer” 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. “Constant Beam” Laser Engraving Ablating A Consistent, Precise Channel Constant Beam laser technology surgically removes the ceramic, revealing smooth and even channels time after time. ENGRAVING LASER BEAM AppLICATION COMpARISON Standard pulse lasers leave uneven recast throughout the hexcell engraving. Inferior channel surfacing results from pulse laser, rendering it impossible to engrave smooth channels. INSIDE FOLDOUT COVER: INSIDE FOLDOUT COVER: FOLD APEX Covers-Flaps 6-12.indd 2 6/5/12 4:38:41 PM