WEB STRETCHING METHOD AND METHOD FOR PRODUCING RETARDATION FILM

摘要

Provided are a web stretching method and a method for producing a retardation film, by which a length in the film moving direction can be shortened in a heating chamber, and variability of the film tension in the width direction as well as scratches, etc., can be prevented. When a web (8) is transferred into a heating chamber (2) and is stretched, by pinch rolls arranged at an entrance side and an exit side of a heating chamber (2), at least one transfer guide (1) is arranged in a heating space (21). Further, heated fluid is discharged from a plurality of fluid discharge holes (9) formed on a surface of the transfer guide (1) to form a fluid layer (11), and the web (8) can be moved without being in contact with the transfer guide (1) using the fluid layer (11) as a transfer surface. Thereby, a film can be uniformly stretched while suppressing the production cost.