Method for making overhead projection transparency

Details Method for making overhead projection transparency Method for making overhead projection transparency

G - Physics

03

B

93/76

G03B 21/64 (2006.01)

Patent

CA 1215260

Abstract The present invention provides a method for making overhead projection transparencies. According to the invention there is arranged a first web of a thin transparent plastic film on a second web of paper, said first web being attached along one longitudinal edge thereof to the second web by means of a line of adhesive. The upper face of the first web has a writable surface and the lower face thereof has a non-writable surface. In the longitudinal direction of the webs, on a first of two sections of said writable surface of the first web, information may be written, e.g. in the form of diagrams, text etc. to be shown by overhead projection, while leaving a second section blank. Thereafter the second web or parts thereof are removed from the first web, whereafter the assembly of the first web, and the possible remainder of the second web, is folded such that the writable surfaces of the said two sections face each other, said writable surfaces being heat sealing to each other. Thereafter the said assembly is fed through a heat sealing means to weld the said two sections together to produce the overhead trans- parency. The first and second webs may be provided as a continuous form, the second web having marginal edges with feeding holes for engagement with a feeding mechanism of a data printer or data drawing machine, suitably provid- . ing multi-color information on the said writable surface.

455517

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