Apparatus and method for formation of sealed packages

Abstract

An apparatus and method for evacuating and sealing a bag ( ) made of a sealable material and containing a charge ( ) of a comminuted or other flowable product, such as roasted and ground coffee. The bag ( ) is positioned with its open upper end around a sleeve ( ) through which a hollow probe ( ) can be extended. A pair of upper jaw members (UJ) close to form an outer temporary seal about an upper region of the bag above an intermediate region of the bag which is also above the level of the surface of the charge ( ) in the bag ( ) where a permanent seal is to be formed. A pair of lower jaws members (LJ) close to form an inner temporary seal about a lower region of the bag below the upper and intermediate regions and above the surface of the charge ( ) in the bag ( ). With the probe ( ) extended through the sleeve ( ) into the bag ( ), the bag ( ) is evacuated through the probe ( ). After evacuation is completed and after withdrawal of the hollow probe ( ), a pair of sealing members (HJ) close against the intermediate region of the bag ( ) in order to form a permanent seal for the bag ( ). Provision may be made for bleed back into the bag ( ), after evacuation thereof, of a small amount of a desirable material such as an aroma fraction or an inert gas such as CO or N .