How do they put the security strips in the money?

Security strips in banknotes are typically integrated during the printing process. The strips, made from a polymer material, are embedded within the paper or printed directly onto the surface, using specialized machinery that aligns them precisely. This process ensures that the strips are securely attached and aligned with other security features, making them difficult to replicate. The strips often contain information or patterns that can be verified under ultraviolet light or with other detection methods.