Detachable foil comprises two cover layers and a core layer which are not stretched or oriented in any particular direction, with the thickness of the core layer equaling several times the thickness of the cover layer

摘要

The cover (1.1, 1.3) and core (1.2) layers of the detachable foil are not stretched or oriented in any particular direction. The thickness of the core layer is equal to 5-20 times the thickness of one cover layer.