Device for vacuum packaging, particularly of food products

Abstract

A packaging device (1a, 1b), particularly for manually or automatically packaging trays containing food products or technical materials which can be inserted, by means of a loading platform (13), between longitudinally folded parts of a single-folded film (7) and comprising means for thermal bonding or heat-sealing for sealing, and at least one nozzle for producing a vacuum and / or for introducing the gas or mixture, and a vacuum chamber (3). The single-folded film (7) is fixed and the vacuum chamber is movable and comprises at least one movable presser arranged above the single-folded film. The presser is forced on top of the tray and is provided with means adapted to convey the streams of air and / or gas. The return of air into the vacuum chamber (3) occurs by means of a series of holes provided between a transverse heat-sealing bar and the wall of the vacuum chamber (3) that is parallel thereto.

Description

technical field [0001] The present invention relates to packaging equipment, in particular to packaging equipment for packaging food and packaging industrial materials. Background technique [0002] Currently, vacuum packaging machines are known, which have a bell-shaped chamber and include a vacuum pump connected to this chamber, also called a vacuum chamber, in which preformed bags, usually open on three sides, are arranged in a vacuum Inside the chamber, the food is placed in the bag. [0003] In these known types of machines, the bag in which the food product has been placed is then placed into a vacuum chamber where a vacuum is then generated, after which heat sealing is performed at the free edges of the preformed bag. [0004] This known technique necessitates the use of pre-formed bags, which are therefore of a size comparable to the size of the food, and thus require considerable labor. [0005] Therefore, there are multiple operating steps, which take time to ach...

AI Technical Summary

Problems solved by technology

[0013] This solution is not without its drawbacks, as it has been found that during the step of heat sealing the film micro-wrinkles are formed which can cause problems during the sealing process and detract from the aesthetics of the package

[0014] In addition, the gas flow within the membrane is not good, thus reducing the efficiency of the device

[0015] Finally, when the operator tugs on the plastic sheet, the sheet may assume an incorrect alignment

[0016] Another problem to point out is that when a vacuum is provided within the bell chamber and thus forms within the bag, this vacuum must be partially compensated with gas; however, if overcompensated, the bell is opened during the heat sealing step. shaped chamber

[0021] As a result, the tray will arrive and find a space insufficient to accommodate it, causing the film to reorient towards the open side of the bag, stopping on the longitudinal heat seal bars, causing the machine to stop, and time wasted for cleaning

[0022] Finally, it should be noted that, for structural reasons, the return of air into the bell or vacuum chamber usually takes place in an area remote from the heat-sealed rod, or by means of the use of a three-way valve in conjunction with the vacuum port. Consistent, but this does not optimize the transport of the flow in the bell chamber

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