Flexible PTC heating element and method of manufacturing the heating element

A flexible PTC heating element comprising:

• a flexible fibrous material having a surface;
• first and second conductive materials disposed on at least a part of the surface of the fibrous material in a pattern in which the first and second conductive materials at least partially overlap each other, wherein one of the first and second conductive materials has a PTC property, and at least one of the first and second conductive materials contains a flexible binder which enables the at least one conductive material to flex with the fibrous material;
• and
• a control material provided on at least a part of the surface of the fibrous material to control impregnation of the first and second conductive materials into the fibrous material;
• wherein the first and second conductive materials are configured to receive electric current to heat the conductive material which has the PTC property.