Tentering
Tenter cliptype stretching machine for thermoplastic films consists tenter clips along a processing section at either side thereof which (tenter clips) are provided with a gap to retain a section of the film marginal edge. Clip type stretching machines function as transverse and simultaneous biaxial stretching units. The thermoplastic films to be processed are heated to temperatures immediately below the fusion range inside the processing section. [Kampf, US Patent 3,916,491 (11/4/1975)]
Recent US Patents
3/1/2011
7,896,634
Film stretching apparatus
Suzuki et al of FUJIFILM, Japan, have developed a tenter dryer so that while a film is dried, the stretch or the relaxation of the film is possible. The tenter dryer includes first-third drying chambers for independently controlling the drying conditions and a shiftable stretch/relaxation device for making the stretch and the relaxation of the film with holding the film. When the stretch/relaxation device holds four edges, cutter blades provided in a drying nozzle cut the film to sheet films. Then while holding the film, the stretch/relaxation device moves between the first-third drying chambers in which drying conditions are controlled. (RDC 9/9/2011)