Method for producing flat tubes, rolling mill and heat exchanger comprising such flat tubes

摘要

The method involves providing a strip with wall parts (a, b) and an inner part (c) that is formed with ripples on a roller line fitted with a pair of rollers, where the strip runs and is formed in a longitudinal direction by the rollers. The inner part is attached between the wall parts, and a closing of a flat pipe is executed. Rarefaction lines are arranged with a distance running in a longitudinal direction of the strip. A wave crest and a wave trough lying in the rarefaction lines are made. The rarefaction lines are formed in parallel lines. An independent claim is also included for a roller line for executing a method for manufacturing a flat pipe.