MANUFACTURING METHOD OF STRETCHED FILM AND MANUFACTURING APPARATUS OF THE SAME

PROBLEM TO BE SOLVED: To provide a manufacturing method of a stretched film capable of stretching the film while a homogeneous force is being impressed along the film transport direction within a film stretching zone and an apparatus for manufacturing the same.SOLUTION: Stretching discs 23A and 23B are arranged while mutually flaring along the width direction toward the transport direction and while a gap enabling mutual opposition is being secured, and cyclic groove portions 28A and 28B skirting along the respective outer circumferences of both are formed. Wires 24A and 24B are outfitted so as to nip, with the groove portions 28A and 28B, both side edge portions of the film and are mobilized along endless orbits so as to stretch the film along the width direction while the film is being transported along the transport direction. Transport rollers 25A through 27B are arranged along inner circumferences of the endless orbits of the wires 24A and 24B. The stretching discs 23A and 23B are arranged along inner circumferences of the endless orbits of the wires 24A and 24B. 【課題】フィルムの延伸区間においてフィルムの搬送方向に均一な力を加えながらフィルムを延伸可能な延伸フィルムの製造方法及びその製造装置を提供する。【解決手段】延伸ディスク２３Ａ，２３Ｂは搬送方向に向かって互いに幅方向に拡がりかつ互いに対向するように間隔をあけて配置され外周部に沿う環状の溝部２８Ａ，２８Ｂが形成される。ワイヤ２４Ａ，２４Ｂは溝部２８Ａ，２８Ｂにフィルムの両側端部を挟み込むように装着されフィルムを搬送方向に搬送しながら幅方向に延伸するように無限軌道に沿って移動する。搬送ローラ２５Ａ〜２７Ｂはワイヤ２４Ａ，２４Ｂの無限軌道の内周に沿って配置される。延伸ディスク２３Ａ，２３Ｂはワイヤ２４Ａ，２４Ｂの無限軌道の内周に沿って配置される。【選択図】図１