
A release liner is a paper or plastic based carrier web material, which is coated on one or two sides with a release agent, which provides a release effect against any type of a sticky material such as an adhesive or a mastic. Release liner are available in different colors, with or without printing under the low surface energy coating or on the b...
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http://en.wikipedia.org/wiki/Release_liner

Backing. Liner lining. The portion of the label that receives the release coating. Prior to application, it protects the adhesive and provides support for the facestock during the die cutting operation and allows the label to be transported to a label applicator or through a computer printer.
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http://www.encyclo.co.uk/local/20829
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