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Web offset presses
The document discusses web offset printing. Web offset printing uses a continuous roll of paper fed through the printing press. There are two methods of drying - heat set uses forced air heating to dry ink rapidly, while cold set relies on natural evaporation and absorption to dry ink more slowly. The document focuses on web offset printing, describing characteristics like high printing speeds up to 900 meters per minute and applications including books, magazines, newspapers, and catalogs.
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Web offset presses
- 1. Welcome To Web offset Presses MDALI HOSSAIN Jr. Instructor(Tech) Graphic Arts Institute Mail: [email protected] 4/28/2015Presented by MD ALI HOSSAIN 1
- 2. Web offset: Weboffset is a form of offset printing in which a continuous roll of paper is fed through the printing press. 4/28/2015Presented by MD ALI HOSSAIN 2
- 3. There are twomethods of web offset printing, regarding drying system, known as heat set and cold set (or non-heat set). In the heat set process, the ink is dried rapidly by forced-air heating. In the non-heat set or cold set process, the ink dries more slowly by ordinary evaporation and absorption. 4/28/2015Presented by MD ALI HOSSAIN 3
- 4. Perfecting Press– Prints on both sides of the paper with one pass. 4/28/2015Presented by MD ALI HOSSAIN 4
- 5. Web FedPress: Printing press that prints from a roll of paper Sheet Fed Press: Printing Press that prints from cut sheets of paper Web Fed Sheet Fed 4/28/2015Presented by MD ALI HOSSAIN 5
- 6. Web offset printing Inthe web offset printing, difference is made between newspaper printing machines and commercial web offset machines. Characteristics of the web offset printing: High printing speed up to 900 m/min Grammages of 45 - 200 g/m² usual High runs 4/28/2015Presented by MD ALI HOSSAIN 6
- 7. Paper width: 11and 56 inches (approximately 28 and 142 centimeters). Paper speeds: ranging from 5 to 50 feet per second (approximately 1.5 to 15 meters per second). Applications:mass-market books, magazines, newspapers, catalogs and brochures. 4/28/2015Presented by MD ALI HOSSAIN 7
- 8. Web offset printing Dryingoven Hot air Inlet temperature > 200°C Web temperature approx. 120°C The length of the oven is very important 4/28/2015Presented by MD ALI HOSSAIN 8
- 9. Web offset printing Paperweb in one unit Plate cylinder Blanket cylinder Plate cylinder Blanket cylinder Paper web Colour absorption Water absorption Moisture resistance pH5 No deformation Resistant against cracking of the colour 4/28/2015Presented by MD ALI HOSSAIN 9
- 10. Web offset printing Centercut 4/28/2015Presented by MD ALI HOSSAIN 10
- 11. Web offset printing Paperon the turner bars 4/28/2015Presented by MD ALI HOSSAIN 11
- 12. Web offset printing Foldsoftening 4/28/2015Presented by MD ALI HOSSAIN 12
- 13. Web offset printing Paperon the former fold 4/28/2015Presented by MD ALI HOSSAIN 13
- 14. Web offset printing Stacker 4/28/2015Presentedby MD ALI HOSSAIN 14
- 15. Web offset printing Cylinderfolder 4/28/2015Presented by MD ALI HOSSAIN 15
- 16. CPC Control OffsetPress. Fig : Heidelberg SM 74-5 4/28/2015Presented by MD ALI HOSSAIN 16
- 17. Ink Control System…….. 4/28/2015Presentedby MD ALI HOSSAIN 17
- 18. Dampening Control System…….. 4/28/2015Presentedby MD ALI HOSSAIN 18
- 19. Resistration Control System…….. 4/28/2015Presentedby MD ALI HOSSAIN 19
- 20. Thank You 4/28/2015Presented byMD ALI HOSSAIN 20