Abstract: A crimp finished yarn wherein a mesh like structure consisting of a large number of thick filaments and a large number of thin filaments intersecting with the large number of thick filaments is formed by opening an elongated thermoplastic synthetic resin film by means of an opener, for example, by causing the film to pass between a pair of vertically disposed card clothing rollers and then this film is made to pass through a tooth-shaped roller forming a crimp applying device and a friction roller at room temperature whereby the molecular arrangement of the surface making slidable contact with the tooth-shaped roller is changed with the friction passing and compression process to form a different layer condition, and at the same time, crimps of saw-tooth condition are produced, whereby a mesh like crimped fiber structure formed by the large number of crimped thick filaments and crimped thin filaments is provided.