The meat packaging machine of the present invention is designed to vacuum pack meat products between two webs of heat sealable thermo-plastic material. One web of each package is formed with at least two pockets connected by and bounded by a sealing flange extending outwardly therefrom. The second web which closes the pockets also extends over the sealing flange and the entire interface between the two webs is heat sealed to prevent migration of meat juices. The machine includes a sealing head and a sealing die mounted one on either side of the sealing plane. Heated sealing members are located in the sealing head and in the sealing die which, when the head and die are in the closed position, are disposed to engage the first and second webs therebetween to effect a heat seal over the entire sealing interface of the webs.
A sealing device includes a top part forming a bell and a bottom part forming a vat, receiving a container to be sealed with a film in the chamber defined by the top and bottom parts. The top part includes on a side supplying the film, a slot for the passage of the film running through a wall of the top part, and a device, preferably an inflatable pipe, for obstructing the slot and blocking the film. The wall of the top part also includes a device for inserting and/or extracting fluid, opening inside the chamber between the slot and the wall lower edge, for extracting gas under vacuum, injecting gas and/or filling the container.
An improved sealing gasket for a vacuum-sealing station of a vacuum packaging machine which is made such that the outer perimetric portion thereof is made of a greater hardness than the rest of the sealing gasket, whereby the sealing heat-elements of a reciprocal heating element only substantially contacts against the softer material of the sealing gasket, allowing this softer material to conform to the uneven or non-level condition of the heating element. In the preferred embodiment, the outer-most perimeter of the sealing gasket is made of a greater hardness in the approximate durometer-hardness range of between 60-85 Shore A, while the remainder of sealing gasket is made of less hardness in the approximate durometer-hardness range of between 30-50 Shore A.
