Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1978-12-14
1980-01-15
Simmons, David A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
156209, 156220, 156226, 156292, 224178, 428315, B31F 100, A45C 1110
Patent
active
041839862
ABSTRACT:
Disclosed is a method for making a laminated thermoplastic sheet from which can be cut one or more embossed straps having a loop at least at one end for receiving the cross-pin of a watch, buckle or the like. In a preferred method, a sandwich of an expanded thermoplastic layer and an unexpanded thermoplastic layer, for example, expanded polyvinyl chloride and unexpanded polyurethane, is subjected (a) to a flow molding step to not only bond the layers together but also to emboss the free surface of the expanded layer and form an elongated groove in at least the unexpanded layer, (b) to a folding step about the longitudinal axis of the groove to form a U-shaped second sandwich with the unexpanded layer pressed onto itself and with a loop at one end formed by the folded-over groove portion, (c) to a bonding step to bond the unexpanded layer to itself without closing the loop or distorting the embossed free surface of the expanded layer and (d) to a cutting step for producing the desired strap shape from the bonded second sandwich with the strap having the loop at one end in the as-cut position. Both the tongue and buckle portion of a watch strap can be thereby mass produced with appearance and feel closely resembling that of a natural leather strap.
REFERENCES:
patent: 3362595 (1968-01-01), Herzog
patent: 3447993 (1969-06-01), Herzog
patent: 3469749 (1969-09-01), Tabata
patent: 3543975 (1970-12-01), Bauer
patent: 3962013 (1976-06-01), Mashida
patent: 4110139 (1978-08-01), Mashida
Simmons David A.
Timex Corporation
Timmer Edward J.
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