US 12,391,059 B2
Forgery prevention apparatus to prevent delamination and forgery authentication method using the same
In Sook Lee, Gyeonggi-do (KR); and Ju Young Lee, Gyeonggi-do (KR)
Assigned to NBST CO., LTD., Gyeonggi-Do (KR)
Filed by NBST CO., LTD., Gyeonggi-do (KR)
Filed on Jun. 29, 2023, as Appl. No. 18/215,923.
Claims priority of application No. 10-2022-0081296 (KR), filed on Jul. 1, 2022.
Prior Publication US 2024/0001704 A1, Jan. 4, 2024
Int. Cl. B42D 25/47 (2014.01)
CPC B42D 25/47 (2014.10) 11 Claims
OG exemplary drawing
 
1. An anti-counterfeiting apparatus comprising:
a first layer formed of a flexible material and including a high-corrugation region and a low-corrugation region;
a second layer adhered to the first layer, formed in a pattern on an upper portion of the high-corrugation region and formed of a material having a Young's modulus greater than that of the first layer;
a third layer adhered to the first layer to cover the low-corrugation region and the second layer, and formed of a material having a Young's modulus greater than that of the first layer and a Young's modulus smaller than that of the second layer; and
an adhesive layer configured to adhere the first layer, the second layer and the third layer,
wherein each of the first layer, the second layer, the third layer and the adhesive layer satisfies Equation 2:

OG Complex Work Unit Math
wherein Xi is a distance between an outer surface of the first layer and a center plane of each corresponding layer,
dn is a distance between the outer surface of the first layer and a neutral plane,
εYi is a yield strain of each corresponding layer, and
r is a radius of curvature of the anti-counterfeiting apparatus, and
wherein the center plane bisects the thickness of each corresponding layer and the neutral plane has an average stiffness of all layers of the anti-counterfeiting apparatus.