SEEN TO PROMOTE VERMEXLAR.

摘要

A method of making a heat exchanger consisting of a conduit having a plurality of passes joined by integral return bends which comprises I. STACKING AT LEAST THREE PAIRS OF STRIPS OF MATERIAL TOGETHER SO THAT EACH PAIR OF STRIPS IS DISPLACED LATERALLY WITH RESPECT TO AN ADJACENT PAIR OF STRIPS, II. BONDING THE STRIPS TOGETHER TO FORM A FLAT, SERPENTINE CONDUIT, AND III. INFLATING THE CONDUIT BY APPLYING INTERNALLY A FLUID UNDER PRESSURE.