Postage stamp separation
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For postage stamps, separation is the means by which individual stamps are made easily detachable from each other.
Separation of imperforate stamps by scissors, knife or tearing often leads to uneven margins on the stamp as in this 1853 stamp of Van Diemen's Land.
Vertical pair of 1d red, from Plate 70, perforated with the Archer experimental roulette
Perforated and imperforate versions of the same Austrian stamp of 1920
Die cutting (web)
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Die cutting is the general process of using a die to shear webs of low-strength materials, such as rubber, fibre, foil, cloth, paper, corrugated fibreboard, chipboard, paperboard, plastics, pressure-sensitive adhesive tapes, foam, and sheet metal. In the metalworking and leather industries, the process is known as clicking and the machine may be referred to as a clicking machine. When a dinking die or dinking machine is used, the process is known as dinking. Commonly produced items using this process include gaskets, labels, tokens, corrugated boxes, and envelopes.
