Envelope for transparency having increased flexibility

Details Envelope for transparency having increased flexibility Envelope for transparency having increased flexibility

C - Chemistry, Metallurgy

09

J

C09J 7/02 (2006.01) B65D 27/04 (2006.01) B65D 27/12 (2006.01) C09J 167/02 (2006.01) G03B 21/132 (2006.01) G03B 21/64 (2006.01)

Patent

CA 2121793

2121793 9310480 PCTABS00022 An improved envelope for transparencies for overhead projectors comprising a substantially rectangular pocket made of a transparent sheet material, the pocket having two longitudinal side edges connected by shorter side edges, and being open at least along one side edge for insertion of a transparency, at least one opaque flap attached in a foldable manner along one of the side edges by means of a flexible adhesive tape, the tape comprising a flexible polyester backing having a thickness of from 5 to 15 micrometers, and coated on one surface of the backing is an adhesive layer, wherein the tape has a flexibility measurement of 1.8 grams, and the flap is capable of remaining in the unfolded position on an overhead projector stage with minimal adhesive transfer at the operating temperature of the overhead projector.

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