Tubular cylinder

摘要

A tubular cylinder (2) is disclosed for handling plastic film webs in connection with production of thin plastic film, e.g. thin packing film. The cylinder (2) includes an outer tube (4) having radial apertures (6) that communicate with an inner tube (8) which is coaxial relative to the outer tube (4). Radial longitudinal partitionings (10) divide the space between the inner and outer tube into longitudinal curving ducts (12). The inner tube (8) is connected with a tubular duct (14) for the supply of air. The cylinder (2) includes bearings at opposite ends which rotatably support the cylinder (2) to rotate. The radial nozzle apertures (6) are disposed along two helical lines so that a helix at the first side of the center plane (20) is wound in a direction opposite a helix at the second side of the center plane (20). The radial nozzle apertures (6) are disposed at an outward angle outward relative to the radial center plane.

主权项

1. A tubular cylinder for handling plastic film webs comprising:
an outer tube including nozzles which point in a direction to direct air radially outward from the outer tube, an inner tube disposed coaxially relative to the outer tube, partitions connecting the inner and outer tube to provide air ducts, the inner tube being connected to a duct for supplying air to the air ducts, cylinder bearings disposed at opposite ends of the cylinder for rotatably supporting the cylinder rotate; and wherein the nozzles are disposed on the outer tube along helixes, a first helix being wound in a first direction on a first side of a center plane of the cylinder and a second helix being wound in a second direction opposite the first direction on a second side of the center plane, the nozzles pointing in the direction away from the radial center plane, the duct for supplying air to the air ducts extending into the inner tube to cause air to be injected into the inner tube and to be partially conducted backward along an outer side of the tubular duct to a first end of the inner tube and to partially conducted backward along the outer side of the tubular duct to a second end of the inner tube and to be introduced into the air ducts and radially directed onward through the nozzles, connections disposed between an inner side of the inner tube and the air ducts, and longitudinally displaceable air regulators for optimizing airflow out through the nozzles and means for longitudinally fixing the longitudinally displaceable air regulators.