公开(公告)号：JPH04213542A

公开(公告)日：1992-08-04

申请号：JP3345591

申请日：1991-02-04

Applicant: BASF MAGNETICS GMBH

Inventor： YOHAN BAARUFUYUSAA ,  ROTAARU RANGAA ,  FURANKU MANABERUKU ,  RAINHORUTO NENTOBITSUHI

IPC: B65H20/10 ,  B65H23/24 ,  G03G15/00

Abstract: PURPOSE: To generate a difference in pressure between an upper side and a lower side of a web made of a web material, for example, a photographic film or paper or magnetic tape in a region of a pair of rollers of a hollow suction means. CONSTITUTION: Respective wedges for air-tightness are arranged in a free space 10 between rollers 2 and 3 on both sides on the outside from outer fringes of the rollers so that they pass below a fringe of a part 5 in which a web floats, and a shape of a cross section of the wedge for air-tightness copies an indicated surface of the roller and is at a short distance from a support face of the roller. In a preferable embodiment, the wedge for air-tightness is hollowed like a tank and is extended by leaving and lowering in the direction of the center of the web and crossing the direction of travel.