Positive temperature coefficient heating elements and their manufacturing

摘要

A method of manufacturing semi-manufactured PTC heating elements (10) comprises the steps of providing an electrically insulating support foil (11), providing an electrically conductive foil (12) from which at least two electrically conductive patterns separated from one another are to be formed, and laminating a PTC compound (13) between the electrically insulating support foil and the electrically conductive foil, wherein the PTC compound has adhesive properties for bonding the laminate together. Preferably, the electrically insulating support foil, the electrically conductive foil, and the semi-manufactured PTC heating elements are provided on rolls. PTC heating elements are manufactured by means of cutting the semi-manufactured PTC heating elements into suitable pieces, patterning and etching the electrically conductive patterns, and attaching electrically conductive terminals to the electrically conductive patterns.

主权项

1. A method of manufacturing semi-manufactured PTC heating elements (10) comprising a three-layer only laminate of an electrically insulating support foil (11), an electrically conductive foil (12), and a layer of a PTC compound (13) sandwiched between and directly contacting the electrically insulating support foil and the electrically conductive foil, the method comprising the steps of:
providing the electrically insulating support foil (11) which is a polymer foil; providing the electrically conductive foil (12) from which at least two electrically conductive patterns separated from one another are to be formed; and laminating the PTC compound (13) between the electrically insulating support foil and the electrically conductive foil, wherein the PTC compound has adhesive properties for bonding the laminate together; wherein the step of laminating is performed by means of feeding the electrically insulating support foil and the electrically conductive foil between rolls (14) while the PTC compound is supplied between the electrically insulating support foil and the electrically conductive foil; and wherein the PTC compound is formed to an evenly thick layer with a selected thickness (t) by means of controlling the distance (d) between the rolls.