Soudronic Ag

Elpatronic Ag

Soundronic Ag

Marcel Oberholzer

Peter Gysi

Peter Schreiber

Peter Taiana

Markus Weber

Hermann Schuppisser

Urs Gehrig

Peter Baessler

Urs Maurer

Alan Marriott

A method for manufacturing a tear-off lid (). A lid blank () is punched with a punching tool () having a die () and a cutting punch () to form a lid ring () with a central removal opening () surrounded by a sealing flange (). The edge of the removal opening () is then formed by drawing to a collar () projecting from the sealing flange () on the intended inside of the lid (underside), the collar () is rolled up at its free end and a tear-off foil () is sealed or glued onto the sealing flange () on the intended outside of the lid (upper side). In accordance with the invention, the die () is arranged on the inner side (bottom) of the lid and the cutting punch () is moved into the die () from the outer side (top) of the lid while punching out a punched pad () and the punched pad () is conveyed by compressed air through the die () to a conveyor () by means of which it is removed from the tool area. It has been shown that by this measure the known and established processes and devices for the production of tear-off lids can be modified with very little effort in such a way that during the punching of the lid blank () the punching or cutting pad is produced on the intended inner side (underside) of the produced lid ring (), which is desirable when producing lids with 're-verse curl'.

Method and device for producing tear-open lids

To manufacture a metal can having a tear-open lid and having a storage space for an object above the tear-open lid, the following procedure is used: first, a top edge of the can which has a smaller diameter than the inside diameter of the can body is formed, wherein a transition region () is formed. After the tear-open lid has been attached, this transition region is deep drawn so that the tear-open lid () is displaced towards the bottom () of the can. This produces the storage space. This procedure allows previously formed tear-open lids to be used, which safely guarantees the imperviousness of the seal of the tear-open lid.

Method and device for the manufacture of a can with a tear-open lid and can with a tear-open lid

A container () is provided with a tear-off lid () having a take out opening covered by a tear-off foil (). The cut edge () of the take out opening is bent back into the chuck wall () area. By this the bare cut edge is protected by the connection of lid and container body. This connection can be provided by a seaming connection.

Container with a tear-off lid and method for its production

In the area of manufacturing peel-off lids () out of lid rings with a peel-off foil () sealed on it, a part of the sealing surface () is bent up in the direction of the lid edge in order to tension the sealing surface with the peel-off foil. A clamping tool () is provided in order to clamp the sealing surface with the peel-off foil and a pressing tool () in order to bend up the unclamped sealing surface section (').

Method and device for manufacturing peel-off lids

The invention relates to a processing device for covers (), wherein processing stations are embodied as individual processing stations () provided with, respectively, one tool for one cover. Several of said stations work in parallel for the simultaneous processing of several covers. If need be, stations can also be used wherein several tools form groups which are functionally separate from each other. As a result, the processing precision and production speed of the objects can be increased.

Processing device and use thereof for the production of covers with a film which can be torn off

In a linear transport device () for tear-off lids (), the latter are tested for the impermeability of the seal and the foil in a test device () that is integrated into the linear transport device. The lid is fixed between a pressure chamber () and a measuring chamber () in an airtight manner and a test pressure is applied to the lid from the underside. An air-permeable support () in the measuring chamber exerts pressure on the upper face of the lid and any increase in air pressure in the measuring chamber caused by a degree of permeability is detected and evaluated by a sensor (). A burst test can be carried out in the same test device.

Method and device for testing the sealing tightness of tear-off lids

In a guide and calibrating tool for guiding container bodies for welding, at least one of the guide rollers is driven. The drive is pneumatic, by compressed air blown by a nozzle onto recesses in the roller. The roller is driven only initially upon restart of the welding machine or in the event of a break in the passage of a series of bodies, in order that no braking is caused by the arrival at the guide tool of the first (and possibly second) body. This enables the gaps between the bodies to be kept more constant even at the start of a series of bodies to be welded, and the first bodies to be welded do not suffer increased slip between the bodies and the welding electrodes.

Method and apparatus for welding container bodies

Sheet metal edges to be welded are preheated prior to welding. At a given welding speed, this results in a smaller temperature gradient in the material to be welded. Consequently the welding speed can be increased, or material which would otherwise provide poor weld quality can be welded at a high temperature gradient. The preheating is carried out for example by high-frequency excitation of the material to be welded.

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Kindhausen, Switzerland

Marcel Oberholzer