Digital Glossing, Its Applications and Performance Evaluation
Abstract:In Graphic Arts industry, the surface treatment of glossing provides two major functions to the printed sheets. The first is to accentuate the piece giving it more emphasis and the second is to serve as a protecting layer against damage to the information underneath. The common practice of glossing involves both in-line and off-line processes of aqueous, varnish, Ultra Violet (UV) and lamination. Aqueous and varnish could be applied in-line using one of the inking units of an offset press. UV could be applied through a build-in device that's part of the offset press or an offline UV applicator. Aqueous and UV could be done real-time but varnish has to be applied after the printed ink is dry completely, usually overnight. Lamination is an off-line process adhering a layer of glossy thin film material on top of the entire printed sheet to deliver high gloss if so desired and this is gloss lamination. When a layer of matte film is applied to the printed sheet it will give a matte appearance instead of glossy and it's known as matte lamination. Both solid and liquid films are available for lamination processes. The gloss lamination could achieve a gloss level of 80 (G20) or higher.
Several attempts were made by the digital printing industry to increase the overall gloss level of electro-photographic prints. They include both in-line and off-line processes. The results were mixed. Gloss lamination and UV coating remain as the two major methods to provide high gloss for electro-photographic prints.1 A novel method to deliver high gloss on these prints is being reported in this article.2 This approach utilizes a belt in fusing a layer of Clear DryInk overcoat on top of a printed sheet to achieve a high level of gloss. It also makes use of barcodes and barcode-scanner to communicate the machine parameters between the digital press and the glossing unit hence an optimized system level near-line solution. Several substrates were tested using this method in comparison to aqueous, varnish, UV and lamination. The achieved gloss level and protection performance were reported in this study.
Document Type: Research Article
Publication date: 2005-01-01
For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.
Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.
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