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It has been suggested that this article or section be merged into Coating. (Discuss) |
Coating and printing processes involve the application of a thin film of functional material to a substrate, such as paper, fabric, film, foil or sheet stock. This article discusses what is frequently termed 'roll-to-roll' or 'web-based' coating. A roll of substrate, when wound through the coating machine, is typically called a web. An article on printing is available that discusses, in particular, the reproduction of text.
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Common and specialty coating functions
- Printing (text or decoration) such as on paper, fabric, and flexible packaging
- Self-adhesive properties such as for tape, labels and packaging
- Melt-adhesive properties such as for vacuum seal and heat seal applications
- "Release" coatings such as the liner of a double-sided tape or vinyl stickers
- Low surface energy coatings to act as a non-stick surface
- Optical properties such as tint, color, anti-reflection, and holographics
- Photo-sensitivity such as for photographic film and paper
- Electronic properties such as passivity or conduction as with flexible circuits
- Magnetic properties such as for magnetic media like cassette tapes and floppy disks
- Water-resistant or water-proof coatings, such as for fabrics or paper
- Scent properties such as scratch and sniff stickers and labels
Processes
Common roll-to-roll coating processes include:
- Air knife coating
- Anilox coater
- Curtain Coating
- Flexo coater
- Gap Coating
- Gravure coating
- Hot Melt coating
- Immersion (dip) coating
- Knife-over-roll coating
- Metering rod (Meyer bar) coating
- Reverse Roll coating
- Roller coater
- Rotary screen
- Silk Screen coater
- Slot Die (Extrusion) coating
Specialty roll-to-roll coating processes include:
The main coating and varnishes for the printing industry include:
- Overprint varnish
- Water based coating
- Acrylic based
- Solvent based
- Aqueous coating
- UV Coating - curing (chemistry)
See also
External links
- Coating and Laminating Machines — Kroenert GmbH & Co KG
- Water Based Coatings — Russell-Webb Ltd
- Learn about printing — International Paper
- Glossary of printing terms — International Paper
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