Static micromixer

A static micromixer comprising a flow guide structure having a separate flow entrance areas for receiving fluids from different fluid supplies and a common outlet area for supplying said fluids to a mixing chamber, said flow guide structure consisting of a plurality of plate-like elements disposed on top of one another to form a stack, each having a series of adjacent grooves extending therethrough, said plate-like elements including two different types of plates arranged in said stack in alternate positions, one having grooves with entrance openings in one area of said plates and the other having grooves with entrance openings in another area of said plate so that the entrance openings of the different types of plates can be arranged in communication with different fluid admission chambers, and each of said plates having exit openings in the same areas of said plates so that the exit openings are all in communication with said mixing chamber, said flow guide structure having the following features:

• a) said plate-like elements consist of foils having a thickness of 30 to 1000 .mu.m and a lateral width in a mm range.
• b) said grooves have a depth of <1000 .mu.m, a width of 10 .mu.m to the mm, and the webs formed between the grooves and bottom walls of the grooves have a thickness of <1000 .mu.m,
• c) the series of adjacent grooves formed in the stack of foils are curved in an arc-like fashion and extend alternately between said mixing chamber and said two admission chambers in such a way that their ends adjacent the mixing chamber extend all parallel and normal to a surface of the flow guide structure including the exit openings.