APPARATUS WITH FACING BELL MEMBERS, FOR MODIFIED ATMOSPHERE PACKAGING OF PRODUCTS PLACED IN TRAYS

摘要

Apparatus with facing bell members (1, 8), for modified-atmosphere packaging of products (M) placed in trays (V, V'), which comprises means for the cyclic positioning of an extended portion of barrier film (H) between the said two open bell members and over trays housed with gasket means (13) in the seats (110) of the bottom bell member, which comprises means (F1, F2) for moving the said bell members towards each other so as to close between them the said film (H) and to close under and at a suitable distance from this latter the edge of the tray (V, V'), apparatus of the type that when the bell members are closed, they form therein two volumes not directly communicating, one of which is formed by the internal chambers (2, 9) of the same bell members that communicate with each other via circuits (16, 3), for example peripheral, while the other volume is formed by the main chambers (P) of the trays (V, V') with the product (M), wherein the said chambers (P) are connected with a portion of their perimeter to holes (26) and to a dedicated circuit (27, 127, 227) for the controlled introduction of process gases and are connected with another portion of their same perimeter to discharge holes for implementation of the air extraction and washing steps,comprising internal valve means to enable the said discharge holes (24, 124) of the main chambers (P) of the trays to communicate, or not, with the said internal chambers (2, 9) to balance the differences in pressures between the said two volumes (2, 9 and P) during the exchange cycle of the gases required to produce packaging of the type known as MAP.