Device and method for longitudinally stretching a film web

摘要

An apparatus for the longitudinal stretching of a film web includes at least one heater in which the film web can be heated, at least one cooling device in which the film web can be cooled, and at least a stretching unit in which the film web is stretched in its longitudinal direction. The stretching unit has a first transport roller having a first peripheral speed in the stretching operation, followed by a second transport roller having a second peripheral speed along the transport path of the film web from the first transport roller, with the second peripheral speed being greater than the first transport roller speed. The apparatus includes a pressing device with which the film web is pressed against the first transport roller along a line which is in the area of the release line of the film web from the first transport roller.

主权项

1. An apparatus for the longitudinal stretching of a film web, comprising:
a heater in which the film web can be heated; a cooling device in which the heated film web is cooled; a stretching unit disposed between the heater and the cooling device in a transport path of the film web, in which the film web is stretchable in a longitudinal direction thereof, the stretching unit including a first transport roller which runs at a first peripheral speed during stretching, and, along the transport path of the film web from the first transport roller, a second transport roller having a second peripheral speed that is higher than the first peripheral speed; and at least one of a first pressing device with which the film web is pressed against the first transport roller along a line which is in an area of a release line of the film web from the first transport roller, and a second pressing device with which the film web is pressed against the second transport roller along a line which is in area of an input line of the film web to the second transport roller.