Abstract: Device for applying a closing strip, comprising: a housing provided with a channel; a feed for closing strip tape emerging into said channel; a rotor mounted for rotation on said housing and provided with blades projecting into said channel; and cutting means located downstream from said rotor for cutting off the formed closing strip from the closing strip tape, characterized by a member located between said rotor and cutting means and extending into said channel for forming the closing strip during the guiding of the closing strip tape thereover.Preferably said member is an edge positioned transversely on said channel, and forms a part of the housing. If the device comprises further a feed for tape form material emerging into said channel and a magazine therefor, said feed for tape form material and its magazine are, preferably accommodated in a separate cassette.