Tubular-bag machine having a gas-adjusting device, and gas-adjusting device for such a tubular-bag machine

Abstract

The invention specifies an in particular horizontal tubular-bag machine (5) in which objects (2) which are provided for packaging are conveyed along a conveying direction (6) by means of a conveying apparatus (51). The tubular-bag machine (5) has an apparatus (50, 43) for producing from a packaging sheet material (12) a packaging tube (13) extending in the conveying direction (6), and also has a longitudinal-connection device (53, 54) and a transverse-connection device (44) for producing longitudinal and transverse connections in the packaging tube (13). Also provided is a gas-adjusting device (8) with an introduction head (80) for engaging in the packaging tube (13) in a direction transverse to the conveying direction, wherein the introduction head (80) has a first gas-passage opening (802, 804, 805, 807, 808) and at least one second gas-passage opening (802, 804, 805, 807, 808) by way of which a gas is fed into the packaging tube (13) or removed therefrom.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a tubular-bag machine having a gas-adjusting device. The gas-adjusting device is particularly used to remove air from a packaging tube formed by the tubular-bag machine and / or to feed gas into the packaging tube. The invention further relates to a gas-adjusting device and a method for adjusting the gas content of the packagings for such a tubular-bag machine.[0002]Tubular-bag machines are used in the packaging industry for packaging products in a packaging sheet material. It is thereby necessary to differentiate basically between horizontal and vertical tubular-bag machines.[0003]In the case of horizontal packaging machines, a packaging sheet material that is unwound from a reel and placed around products or product groups, which are supplied in a row, is formed to a tube which laterally encloses these products or product groups. The packaging tube and the products to be packaged are usually moved together and continu...

AI Technical Summary

Benefits of technology

[0047]During an interruption of the packaging production of short duration, the gas feed and / or gas evacuation is advantageously maintained (e.g. for a certain amount of time and / or until the operating state of the machine changes) in order to prevent the packaging tube from filling with air again by providing a kind of gas curtain. In order to save gas, a reduced amount of gas can thereby be fed and removed.

Problems solved by technology

The problem that exists with tubular-bag machines is that too much air is enclosed in the manufactured packagings, which can lead to bloated packagings.

The disadvantage of such systems, in which a lance protrudes into the packaging tube, is that the lance in the packaging tube requires a relatively large space and therefore increases the amount of packaging material for the packagings being produced.

When packaging small and elongated products, there is additionally the risk that the products will be displaced in the packaging tube if contact is made with the pipe.

In the event of a malfunction of the tubular-bag machine and a subsequent intervention by the operating personnel, the reinsertion of the lance into the packaging tube is furthermore relatively arduous; and there is additionally the risk of the lance being damaged in the process.

This construction comprising a plurality of flat nozzles and roller pairs disposed therebetween is relatively complex and requires much space.

Furthermore, the formation of leakage openings between the individual flat nozzles is unavoidable.

This adjustment has to be carried out and optimized in each case manually by the operating personal, which constitutes a relatively arduous and time intensive process.

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