Patent ID: 11878541
Assignee: HP INDIGO B.V.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B  A | IPC A  B

Claim 9:
10. A system to cause production of a scratch-off structure at a printer, comprising:
a duplexer component to alter a substantially transparent substrate from a first side to a second side to allow a print engine to apply layers on the first side and the second side; and
a print engine to:
apply a primer layer on the first side of the substantially transparent substrate;
apply a security ink layer to generate security information on the primer layer such that the security information is viewable from the second side of the substantially transparent substrate;
apply a first opaque background layer on the security ink layer;
apply a release ink layer on the second side of the substantially transparent substrate; and
apply a second opaque background layer on the release ink layer

a corona discharge component to:
apply a corona treatment to the second side of the substantially transparent substrate prior to the print engine applying the release ink layer on the second side of the substantially transparent substrate.