A method of manufacturing a security item comprises coextruding at least two polymer plastics materials (6, 7) with different characteristics so as to form a substrate, neither material being biaxially oriented; and providing security indicia (14) on the substrate.
申请公布号
WO9946133(A1)
申请公布日期
1999.09.16
申请号
WO1999GB00634
申请日期
1999.03.03
申请人
DE LA RUE INTERNATIONAL LIMITED;CHATWIN, CHARLES, EDWARD;FICE, CHRISTOPHER, JOHN
