FIELD: process engineering.
SUBSTANCE: this invention relates to developments in protective substrates. Protective substrate comprises fibrous bearing structure and fibrous strip incorporated therewith. Said fibrous strip has at least one orifice indiscernible on viewing protective substrate in reflected light but visible in passing light. Note that said fibrous strip is, in fact, visible on at least one substrate surface with fibers of bearing base. Said fibers fill at least one orifice and form fibrous layer on strip surface around orifice edges.
EFFECT: increased counterfeit protection, ease of manufacture.
48 cl, 29 dwg
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