Device and a method for embossing a metal foil
OwnerKarl Boegliinventor
Life of this patent
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Abstract
For embossing a metal foil the same is passed between two similarly toothed rollers positioned so that the teeth of each roller engages the teeth of the other. A high-quality embossing is obtained which may be kept practically constant over long periods of operation. The rollers are mutually synchronized such that only one of these rollers need be coupled with a driving mechanism. The other roller is free and may easily be removed, replaced or adjusted in order to vary the force by which it is pressed against the foil and the driven roller respectively.
Claims11
A device for embossing a delicate metal foil packaging material comprising:
- a pair of opposing, embossing rollers, each having a hard, generally cylindrical surface and an array of pointed pyramid-shaped teeth means for embossing the delicate metal foil extending along said surface in both the axial and circumferential directions, the pitch between adjacent teeth being on the order of about 0.4 millimeters and the size of each tooth being on the order of about 0.25 to 0.3 millimeters;
- a drive means operatively connected to drive a first of said rollers;
- a second of said rollers being displaceably and adjustably mounted opposite said first roller and positioned so that the teeth of the first roller are staggered relative to the teeth of the second roller whereby the teeth of the first roller are operable, when engaged by the opposing teeth of the second roller, to synchronously drive the second roller.
The device according to claim 11, wherein the teeth of each roller have a height of on the order of 0.25 to 0.30 mm, and the opposing teeth of the rollers engage each other to a depth of about 0.15 to 0.20 mm.
A method of embossing delicate foil material by passing said foil between a pair of embossing rollers, comprising the steps of:
- providing a pair of embossing rollers, each having a similar surface tooth pattern comprising an axial and circumferential array of pointed, pyramid-shaped teeth,
- driving a first of said pair of rollers;
- inserting said metal foil between the rollers;
- and
- adjusting the pressure exerted by a second of said rollers against said first roller until the teeth of said tooth pattern of said rollers engage each other for properly embossing said foil and for synchronously driving said second roller by said first roller.
Dependencies are inferred from the claim text.