Film stretching apparatus
View Patent ↗In a tenter dryer, while a film is dried, the stretch or the relaxation of the film are made. 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 previously controlled.
1. A film stretching apparatus comprising:
a drying chamber for drying a film containing a solvent or a water;
a cutting device for cutting said film to sheet films during the drying; and
a stretching device for stretching said sheet film in a predetermined direction in said drying chamber,
wherein said cutting device cuts said film widthwise to form rectangular sheet films having a predetermined size in a lengthwise direction.
2. A film stretching apparatus comprising:
plural drying chambers for drying a film containing a solvent or a water;
a cutting device for cutting said film to the sheet films before or during the drying; and
a stretching device for stretching said sheet film in a predetermined direction in said drying chambers,
wherein said stretching device includes a first stretcher for stretching said film in a first direction and a second stretcher for stretching said film in a second direction perpendicular to said first direction,
at least one of said first and second stretchers has a holder for holding edges of said sheet film and a shifting mechanism for shifting said holder, and
said cutting device cuts said film widthwise to form rectangular sheet films having a predetermined size in a lengthwise direction and said stretching device performs the stretching of said sheet films during the drying in said plural drying chambers.