Distribution pattern of a plate heat exchanger

Plate heat exchanger for evaporation of a liquid, comprising a number of vertically oriented and against each other abutting thin heat transfer plates (4), provided with a pressed corrugation pattern in the form of ridges and grooves, and between the heat transfer plates (4) arranged gaskets (13, 14, 16, 25), defining a plurality of plate interspaces, each second plate interspace delimiting a flow space for said liquid and the plate interspaces adjacent each second plate interspace delimiting flow spaces for a heating fluid, in each of the flow spaces for the liquid there being several inlet openings (18) horizontally distributed across the width of the heat transfer plates for supply of said liquid, characterized in that adjacent heat transfer plates have opposite located horizontally extended portions (28), which show a corrugation pattern having essentially less pressing depth than the remaining part of the corrugation pattern of the heat transfer plates, that the ridges in said portions (28) of two adjacent heat transfer plates (4) are crosswise arranged and that the corrugation patterns are so designed that the heat transfer plates (4) in said portions (28), via the crosswise arranged ridges, abut against each other in the flow space for said liquid, but are essentially separated from each other in the flow space for the heating fluid.