Patent ID: 9683789
Date: 2017-06-20
CPC Classifications: F28D,F28F,Y10T

Claim:
1. Method of producing multiple channels for use in a device for exchange of solutes or heat between at least a first and a second fluid flow, wherein the device comprises at least a first and a second sheet, the method comprising: providing each of said first and second sheets with at least one profiled surface, joining said first and second sheets together with the at least one profiled surface facing each other, whereby channels having a constant height along their entire longitudinal extension are formed by the shape of the at least one profiled surface, wherein each of said first and second sheet has a first end portion and a second end portion, said first and second end portions having sloping intermediate surfaces between each channel, wherein the sloping intermediate surfaces are level with an outer top surface of the channels at a first end of the first end portion and a second end of the second end portion, wherein each sloping intermediate surface is inclined relative to the longitudinal extension of the channels until reaching a planar longitudinally extending portion between the first end portion and the second end portion, and wherein the sloping intermediate surfaces have a greatest lateral extent at the first and second ends and narrow to a lesser lateral extent at the planar longitudinally extending portion between the first and second end portions.