Saturday 8 October 2011

'At the printers' seminar.

- Commercial print processes are practical, technical and economical. 
- Repographics - people check over work before it's sent to print.
- Rotary printing - lithography, gravure, flexo.
- Digital printing.
- Screen printing. 
- Pad printing. 
- Offset lithography - transfer ink to an offset rubber blanket roller and then to the print surface. Sheet fed or web fed. Leaflets, mail shots and posters.
Web offset machine uses 'rolls' of material as apposed to sheet fed. 
- Rotogravure - copper plates (with mirror image) transfer ink directly to the print surface usually on rolls. 
Plates are more durable. Newspapers and high run magazines. More expensive process. 
- Flexography - a positive, mirror image rubber polymer plate, on a cylinder, transfers 'sticky' ink directly to a print surface. Usually roll fed. Crisp packets, bottle labels, chocolate bars. Offset from underneath. The image is raised. 
- Relief.
- Intaglio. 
- Planographic.
Digital; 
- RIP - raster image processor. 
- Mechanical screen print process. 
- Rotary screen printing for printing on cylinders. 
- Durable inks benefit the screen print process. 
- Pad printing - can transfer a 2D image onto a 3D object. Calculators, golf balls, memory sticks. 
- Lithography - CMYK - 4 color process. 
- Linen tester; used to check print quality. 
Colour processes; 
- Subtractive - the more colour... darker. 
- Additive colour - less colour... lighter. 
- Duotone. 
- Spot colour.
- Monochrome.
- CMYK.
- RGB. 
- Greyscale. 

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