Method for producing an insulating web

A method for manufacturing an insulating bar made from a thermoplastic plastics material, wherein the insulating bar has a strip-like base body and, integrally formed on the opposite longitudinal edges thereof, connection strips having a geometry, and wherein the base body is constructed alternately with raised portions and recesses, as seen in a longitudinal direction of the insulating bar, the method comprising:

• shaping the insulating bar as a blank having a substantially planar structure of the base body without raised portions and recesses but with the connection strips;
• cooling the insulating bar blank to a temperature corresponding to a maximum long-term service temperature of the thermoplastic plastics material or lower;
• heating the base body of the insulating bar blank to a forming temperature which temperature, if the thermoplastic plastics material is a crystalline plastics material having a crystalline melting point, is approximately 30° C. below the crystallite melting point or higher, and if the thermoplastic plastics material is an amorphous plastics material having a softening point, is approximately 30° C. above the softening point or higher;
• forming the base body by a tool to produce the alternating raised portions and recesses, wherein the geometry of the connection strips is retained;
• and
• cooling the insulating bar to a temperature corresponding to the maximum long-term service temperature or lower.