Length-wise closed semi-finished flat tube for segmentation in finished flat tube for heat exchanger of heating- or air conditioning system of motor vehicle, has impression-free section arranged at both tube ends

摘要

The tube (1) has impression-free sections (24, 27) alternately arranged in a tube longitudinal direction (22) that is parallel to a tube longitudinal axis (10), and molded sections (23) comprising impressions (15, 16) attached in a tube wall (2). One of the impression-free sections is arranged between the molded sections, and the other impression-free section is arranged at both tube ends. The molded sections have longitudinal extension of 25 to 100 mm in the tube longitudinal direction. Independent claims are also included for the following: (1) a method for producing finished flat tubes (2) a heat exchanger comprising finished flat tubes.