초록 ▼

A method and apparatus for making gas flushed packages in a vacuum chamber machine which includes a bag mouth clamp spaced apart form seal bars disposed to transversely seal the bag neck. A vertically moveable piercing blade and nozzle penetrate the upper wall of the bag neck as the chamber pressure

A method and apparatus for making gas flushed packages in a vacuum chamber machine which includes a bag mouth clamp spaced apart form seal bars disposed to transversely seal the bag neck. A vertically moveable piercing blade and nozzle penetrate the upper wall of the bag neck as the chamber pressure is lowered and the bag “balloons”thereby causing the upper and lower neck walls to separate. Once the bag is pierced and the residual air escapes, a predetermined amount of gas is injected and then the bag is sealed. If desired, sufficient gas can be injected to make a pillow pack.

대표청구항 ▼

A method for making gas flushed packages in a vacuum chamber comprising: (a) placing a loaded gas impervious bag in a vacuum chamber; (b) clamping the bag neck to close and hold the bag; (c) closing and partially evacuating the chamber thus causing the bag to balloon and the bag walls in the neck ar

A method for making gas flushed packages in a vacuum chamber comprising: (a) placing a loaded gas impervious bag in a vacuum chamber; (b) clamping the bag neck to close and hold the bag; (c) closing and partially evacuating the chamber thus causing the bag to balloon and the bag walls in the neck area to separate; (d) piercing the upper, separated bag wall with sharpened nozzle means to allow trapped air inside the ballooned bag to escape into the chamber; (e) continuing the evacuation of the chamber and consequently evacuating the pierced, ballooned bag; (f) stopping the chamber evacuation but maintaining the lowered pressure within the chamber and injecting gas through the nozzle into the bag; and (g) heat sealing the bag between the point at which the bag is pierced and the product loaded in the bag thereby providing a gas flushed package.