US 12,403,643 B2
Coextrusion of periodically modulated structures
Josef Riedl, Attenkirchen (DE)
Assigned to GIESECKE+DEVRIENT EPAYMENTS GMBH, Munich (DE)
Filed by GIESECKE+DEVRIENT MOBILE SECURITY GMBH, Munich (DE)
Filed on Oct. 6, 2021, as Appl. No. 17/495,092.
Application 17/495,092 is a division of application No. 16/461,570, granted, now 11,370,157, previously published as PCT/EP2017/001339, filed on Nov. 15, 2017.
Claims priority of application No. 102016013776.2 (DE), filed on Nov. 18, 2016.
Prior Publication US 2022/0072751 A1, Mar. 10, 2022
Int. Cl. B29C 48/31 (2019.01); B29C 48/00 (2019.01); B29C 48/07 (2019.01); B29C 48/08 (2019.01); B29C 48/17 (2019.01); B29C 48/19 (2019.01); B29C 48/20 (2019.01); B29C 48/305 (2019.01); B29C 48/315 (2019.01); B29C 48/49 (2019.01); B29C 48/495 (2019.01); B29C 48/92 (2019.01); B29L 7/00 (2006.01)
CPC B29C 48/92 (2019.02) [B29C 48/0011 (2019.02); B29C 48/07 (2019.02); B29C 48/08 (2019.02); B29C 48/17 (2019.02); B29C 48/175 (2019.02); B29C 48/19 (2019.02); B29C 48/20 (2019.02); B29C 48/307 (2019.02); B29C 48/31 (2019.02); B29C 48/315 (2019.02); B29C 48/49 (2019.02); B29C 48/495 (2019.02); B29L 2007/008 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for manufacturing a foil having a variable strip geometry for employment in a data carrier, the method comprising:
extruding at least one first surface and at least one second surface;
varying at least one of the surfaces with respect to geometry of the at least one of the surfaces by;
transverse movement of at least one roller of an extruder;
movement of a position-variable distributor rail of the extruder; and
an adaptation of a melt flow within the extruder, wherein the adaptation of the melt flow is a structural adaptation configured to vary a path of the melt flow within the extruder;
changing material properties of at least one of the surfaces in a flow direction along a length of said at least one of the surfaces; and
forming the surfaces of the foil in a sequence that alternates orthogonally to an extrusion direction, the extrusion direction being defined as a direction in which molten material of the surfaces is guided through and out of the extruder;
wherein the variable strip geometry is defined as adapting individual strips of the at least one first surface and the at least one second surface with respect to width and in extension along a length of the individual strips;
wherein the adapting of individual strips results in the at least one first surface being narrower than the at least one second surface;
wherein the step of changing material properties of at least one of the surfaces includes splitting at least one of the surfaces into subdivided, partial surfaces having alternating materials with respect to the extrusion direction.