This preview shows page 1. Sign up to view the full content.
Unformatted text preview: PACKAGING GRAPHICS / PRINTING Printing Processes:
• • • • • Letterpress Screen Printing Offset Lithography Roto Gravure Flexography Comparison of the Major Printing Processes Major
Process Letterpress Screen Process Offset Lithography Rotogravure Flexography Substrate Paper, newsprint Plastic, Paper, board linen Paperboard Film, foil, paper, paperboard Film, foil, paper, corrugated board Ink Oil based paste inks Liquid hydrocarbon High viscosity oil based paste Low viscosity organic solvents Low viscosity water or organic solvents Plate Raised relief plate Woven stencil Flat Engraved cylinder Relief printing plate Printing Process
• Line images • Halftone images • Process images Line, Halftones and Process Halftones
Line Images - Consisting of solids and lines as in high Line strength background colors, renderings of sketched images, cartoons, etc. images, Example: Line Colors Line, Halftones and Process Halftones
Halftone Images - Formed by a pattern of discrete dot Halftone sizes. Dots vary in area but have uniform density. Creates illusion of continuous tone from distance. Creates Example: Line, Halftones and Process Halftones
Process Images - Halftone color printing created by the Process color separation process whereby an image is broken down into the primary colors - cyan, magenta, yellow, black. yellow, Example: Conventional Dots Offset Lithography Method:
Image Transfer Process • photographically image plate • nonimage areas accept water based solution, imaged area accept oil based ink • ink transferred from plate to rubber blanket then to the paper Major Markets • publishing • newspaper • books • folding cartons • packaging Offset Lithography Offset Offset - Planographic Offset Lithography
Strengths • high quality • mature technology • high speed • optimum for paper and board Weaknesses • equipment capital cost • cycle time • labor intensive • slow drying oil based inks • fixed repeat length Roto Gravure Method:
Image Transfer Process • Engraved cylinder • Ink transferred from wells directly onto substrate Major Markets • Publishing • Packaging Gravure Gravure Roto Gravure:
Strengths: • high quality • long run length • high speed Weaknesses • cycle time • cylinder costs • environmental issues • registration issues • material structures Flexo Printing Method:
Image Transfer Process • molded rubber plates • photographically imaged relief plates • plates are mounted with adhesive tapes • Ink metering (anilox) roll system • ink transferred from palte Major Markets • Packaging
– flexible • frozen foods • snack food • bread bags – folding carton – corrugated tag & label – envelopes Flexo Flexo Flexography:
Strengths • cycle time • variable repeat length • wide variety of substrates • high speed • environmentally friendly • lower total delivered cost Weaknesses • quality preception • lack of experience in Asia Flexo Press Flexo Printing Outlook Flexo Flexo will continue to be the fastest Flexo growing print process growing New installations of high-performance New 8-color flexo presses will exceed 4 and 6-color 6-color Flexo printing will offer the most Flexo environmentally friendly printing process environmentally Outlook Flexo Printing Outlook Flexo will continue to be the fastest Flexo growing print process growing New installations of high-performance New 8-color flexo presses will exceed 4 and 6-color 6-color Flexo printing will offer the most Flexo environmentally friendly printing process environmentally ...
View Full Document
This note was uploaded on 02/09/2009 for the course PKG 101 taught by Professor Haroldhughes during the Spring '08 term at Michigan State University.
- Spring '08