Abstract: An air-displacement roller bears against a film roll and extends to the ends of the film roll. A film web is fed to a winding core via a contact cylinder and is wound to form the film roll. The air layers carried along by the roll and the film web are included between the particular uppermost roll plies and for the most part are pressed out of the film roll via the end faces of the latter by the air-displacement roller. Each of the two roller ends is movable via a pressure mechanism articulated on a roller holder, the air-displacement roller being pressed against the film roll with a linear force lower than 10 N/cm to higher than 0.2 N/cm.

Abstract: An end wall having a front side which forms a flat surface while the rear side is reinforced by radial ribs and annular ribs. The radial ribs are reinforced by webs which are disposed within the ribs. A central push-in peg and locking bosses are located on the front side of the end wall. Corner surfaces of the end wall are rounded and are adjoined with the cylindrical locking bosses which have the same radius as the rounded corner surfaces. Three side walls of the end wall are equipped with stacking bosses limiting stacking pockets which have a shape complementary to that of the stacking bosses. At least the fourth side wall of the end wall has a grooving and, when a winding roll is packaged by use of the end walls, rests on a pallet.

Abstract: An end wall for a wound roll, made from a moldable material and including a rectangular plate having rounded-off corners and a front side that faces in the direction of the wound roll, the front side having a smooth, flat surface; the rectangular plate further including a backside that faces outwardly away from the wound roll; radial webs and annular webs formed on the backside for reinforcing the rectangular plate; locking bosses formed on the front side of the rectangular plate; a central insertion peg for insertion in the wound roll located on the front side of the rectangular plate, stacking bosses and stacking pockets provided on at least two side walls of the rectangular plate, the stacking bosses being delimited by the stacking pockets of complementary design relative to the stacking bosses; and at least one side wall of the rectangular plate having a plane surface, wherein when wound rolls with the end walls attached are stacked side-by-side or vertically, the stacking bosses and stacking pockets of e

Abstract: In an interstice 6 between a film reel 8 and a contact roll 3, two air displacement rollers 5a, 5b are arranged parallel to the film reel 8 and the contact roll 3. In comparison with the contact roll and the winding core 2, these two air displacement rollers have a smaller diameter of about 7.5 to 50 mm. The rollers squeeze out the air boundary layers 4 at the film web layers 1 moving into the interstice 6. The contact roll 3 and one of the air displacement rollers 5a have a smooth hard surface layer with an average peak-to-valley height Ra of less than 0.4 microns and a Brinell hardness HB of greater than 10 HB 2.5/62.5. The distance between the two air displacement rollers and the contact point of film reel with the contact roll is chosen so small that new air boundary layers on the film web sections within the interstice can form only to a slight extent.

Abstract: In a gusset-shaped space 6 between a film roll 8 and a contact roller 3, two air displacement rollers 5a,5b, are arranged parallel to the axes of the film roll and the contact roller. These rollers have in contrast to the contact roller and the winding core 2, and the film roll, respectively, small diameters of 7.5 to 50 mm. These rollers displace the air layers 4 adjacent to the film web 1 which are moving into the gusset. The selected distance for the displacement of the air layers between the point of contact of the film roll and the contact roller is so small, that new air layers on the film webs within the gusset can only be formed in the smallest amounts.