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US 6,176,819 B1Granted
Device and method for embossing a foil
AssigneeBoegli-Gravures S.A.
InventorsCharles Boegli, Bernard Wist
Life of this patent
Estimating the term…
Abstract
The embossing process is effected between a pair of embossing rollers provided with toothings of the same kind which comprise rows of pyramidal teeth extending in the axial and the circumferential directions. Compared to the theoretical pyramid shape, the heads of the teeth are flattened while the edges of the pyramids are cut. The rollers, which are mutually displaceable in the axial direction, are thus able to catch in a stable mutual position of maximum penetration and to remain in this position in operation. This allows a safe mutual synchronization of the rollers and an optimal embossing of any kind of materials, especially of paper foils.
Claims20
A device for embossing a foil comprising:
- a pair of rollers each having a surface provided with a set of teeth;
- each of the pair of rollers being moveable relative to the other so as to press against each other, whereby the set of teeth of each roller are configured to mutually engage each other via a film to be embossed that is disposed between the rollers;
- one of said rollers being fixedly supported and driven, the other of said rollers being freely rotatable and capable of being driven by engagement with the fixedly supported roller;
- wherein the freely rotatable roller is moveable both radially and circumferentially relative to the fixedly supported roller so that upon engagement of the rollers, the rollers self-adjust to a stable mutual position in which teeth of one of the rollers are each symmetrically enclosed between four teeth of the other roller.
1 more element
A method of embossing films, comprising:
- providing a device for embossing a foil comprised of:
- a pair of rollers each having a surface provided with a set of teeth;
- each of the pair of rollers being movable relative to the other so as to press against each other, whereby the set of teeth of each roller are configured to mutually engage each other via a film to be embossed that is disposed between the rollers;
- one of said rollers being fixedly supported and driven, the other of said rollers being freely rotatable and capable of being driven by engagement with the fixedly supported roller;
- wherein the freely rotatable roller is movable both radially and circumferentially relative to the fixedly supported roller so that upon engagement of the rollers, the rollers self-adjust to a stable mutual position in which teeth of one of the rollers are each symmetrically enclosed between four teeth of the other roller;
- disposing a film substantially comprised of paper between the pair of rollers;
- pressing the rollers against each o ther with the film therebetween;
- and driving the fixedly supported roller.
5 more elements
A device for embossing a foil comprising:
- a pair of rollers each having a surface provided with a set of teeth, which teeth are shaped as pyramids with a point that is flattened by at least 2%;
- each of the pair of rollers being moveable relative to the other so as to press against each other, whereby the set of teeth of each roller are configured to mutually engage each other via a film to be embossed that is disposed between the rollers;
- one of said rollers being fixedly supported and driven, the other of said rollers being freely rotatable and capable of being driven by engagement with the fixedly supported roller;
- wherein the freely rotatable roller is moveable both radially and circumferentially relative to the fixedly supported roller so that upon engagement of the rollers, the rollers self-adjust to a stable mutual position in which teeth of one of the rollers are each symmetrically enclosed between four teeth of the other roller.
1 more element
A method of embossing films, comprising:
- providing a device for embossing a foil comprised of:
- a pair of rollers each having a surface provided with a set of teeth, which teeth are shaped as pyramids with a point that is flattened by at least 2%;
- each of the pair of rollers being movable relative to the other so as to press against each other, whereby the set of teeth of each roller are configured to mutually engage each other via a film to be embossed that is disposed between the rollers;
- one of said rollers being fixedly supported and driven, the other of said rollers being freely rotatable and capable of being driven by engagement with the fixedly supported roller;
- wherein the freely rotatable roller is movable both radially and circumferentially relative to the fixedly supported roller so that upon engagement of the rollers, the rollers self-adjust to a stable mutual position in which teeth of one of the rollers are each symmetrically enclosed between four teeth of the other roller;
- disposing a film substantially comprised of paper between the pair of rollers;
- pressing the rollers against each other with the film there between;
- and
- driving the fixedly supported roller.
6 more elements
Dependencies are inferred from the claim text.