The security thread is usually a 1-3 mm wide metallised strip that lies within the paper, as it is already introduced into the paper mass during substrate production. A variant is the window security thread, which lies open in sections by reducing the thickness of the paper as with a watermark. This is usually 3-6 mm wide and can also be provided with additional optical or invisible properties.
Nowadays, the flawless functionality of a product is taken for granted by customers. Our perception of quality is therefore primarily shaped by the visual appearance. Abrasion marks on the surface - produced by the human hand - are mainly responsible for the reduced quality perception of a product. The abrasion can cause lasting damage to the surface and thus leads to a reduction in value and a quality defect of a product. With the TRIBOTOUCH testing device, we simulate the abrasion of the human hand on the finished product. The qualified test statement thus prevents annoying quality defects.