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Pad Printing PLET 370 Benton Lewis, Ben McElhaney, Luke Miller Objective • Ease of Pad Printing • Inform about process • Very useful in many markets Outline • • • • • • I. Background II. Equipment & Technologies III. Process IV. Advantages V. Disadvantages VI. Applications Pad Printing Background • Also known as ©Tampo Printing • Dates back over 200 years • Similar to other decorating techniques Equipment & Technologies • Transfer Pad – Generally made from silicon rubber – Tip should never contact graphic • Cliché – Made of steel or polymer – Artwork critical; photoengraved into cliché – Normal detail - .001” deep Equipment Cont’d • Ink – Extremely high pigmentation levels – Polyolefins and Thermosets need pretreated • Part Fixture – Steel or plastic – Parallel to cliché, held firmly • Doctor Blade – Wipes cliché, use minimum pressure Process • Ink Flooding -Cliché is flooded with ink • Pad Wetting -Pad pressed down into ink • Head Stroke -Pad is lifted Process Continued • Ink Deposition -Pad pressed onto the part • Pad Release -pad is lifted away Process Cont. • Degreasing molded parts -organic solvent cleaned • Surface treatment -corona discharge etc. • Ink curing process -thermal curing -UV curing Advantages • • • • Variety of geometries and surface finishes Works on most materials Wet on wet capabilities Very fine detail -widths to .003” • Permanent decoration • Multi-color process • Low pressures required Disadvantages • • • • Some materials difficult to decorate Cost of waste Large graphics difficult to print Cannot print in confined areas Applications • • • • Cell phones Alarm clocks Shower heads Anything with small lettering or graphics