Method for manufacturing a heat exchanger

A method for manufacturing a heat exchanger from a plastic material, said method comprising the steps of:

• feeding at least two sheet elements made from said plastic material,
• by means of shaping means, shaping of said sheet elements to form a number of heat exchanger plates, whereby said shaping means are adapted to also undertake joining the sheet elements partly along edges so that a fluid inlet and a fluid outlet are created, whereby the sheet elements are pressed together, and
• two or more heat exchanger plates are stacked on top of one another, characterized by that the stacked heat exchanger plates are joined in order to assemble them into a heat exchanger, whereby the stack of heat exchanger plates is welded so that the fluid inlets and fluid outlets of the respective heat exchanger plates are combined to form a common fluid inlet and a common fluid outlet, and whereby the sides of the heat exchanger plates are welded together, so that a fully functional heat exchanger is manufactured with plastic sheets as the only raw material.