75%cotton and 25% linen security paper with thread line
75%cotton and 25% linen security paper with thread line
In the papermaking process, a gold or plastic thread is placed in the middle of the paper. The earliest used was a special metal wire, and now it uses polyester plastic wire, mini-letter security wire, fluorescent security wire, magnetic wire, etc.
The shape of the safety line is straight, wavy, zigzag, etc. According to relevant information, the new version of US bills not only embed metal wires in the paper, but also reduce the text on the lines that can only be seen with a high-power magnifying glass.
In recent years, a thermal safety thread has been introduced, which is pink and opaque at room temperature. When the temperature reaches 37°C with a finger, the microprinted text will appear locally. There is also a kind of security thread, that is, the laser holographic security thread produces an image with color changes due to different viewing angles.
Put the security thread in the paper, the width of the thread can be as small as 1mm, the normal width is 2mm. If multiple security threads are put in at the same time, the spacing of the lines can be as small as 4mm.
The security line can be printed with patterns and texts that users need. According to the different difficulty requirements of anti-counterfeiting, the printed patterns and texts can be made into hollow or non-hollowed, and the micro-text security line can be printed.
The security thread has a certain degree of magnetism, which provides an anti-counterfeiting basis for the automatic detection of banknote instruments. Anti-counterfeiting threads are also mostly used in the anti-counterfeiting of banknotes in various countries. The safety thread in banknote printing is also the focus of research in various countries: for example, the United Kingdom adopts a window-type transmission safety thread, France develops a partial aluminum-plated safety thread, and Finland uses fluorescence. Security lines, etc.
