MANUFACTURING METHOD OF HIDDEN LINE HAVING COLORED LETTERS OR PATTERNS AND SECURITY PAPER HAVING THE LINE

摘要

PURPOSE: Provided are a manufacturing method of a hidden line having colored letters or a colored pattern which is characterized by preventing counterfeiting of coins effectively and increasing optical effect, and security paper having the line. CONSTITUTION: The hidden line is obtained by a process containing the steps of: depositing a metal deposited layer to plastic transparent film with printed colored letters or printed colored pattern with a sputtering method, followed by sticking the metal deposited layer on the film; or adhering at least two of film depositing the metal deposited layer to the plastic transparent film with printed colored letters or printed colored pattern to produce the hidden line having at least two of the metal deposited layer and 25-40micron of thickness.