公开(公告)号：KR880000087B1

公开(公告)日：1988-02-23

申请号：KR820000204

申请日：1982-01-19

Applicant: NESTLE SA

Inventor： GRAHAM CLOUGH

IPC: B65B7/28 ,  B65B7/16 ,  B65B31/00 ,  B65B31/02 ,  B65D17/40

Abstract: A container is sealed by applying an intermediate membrane of gas- permeable microporous plastics, extracting headspace gas through the membrane and applying a final barrier membrane. The headspace is pref. filled with inert gss after extrn. to restore atmospheric pressure. The method enhances shelf life by removing headspace oxygen and eliminates the need for wasteful gas flushing. The intermediate membrane is pref. of polypropylene with 2-5 microns pore dia. and air porosity of 1000-2000 cc/min. Gas is pref. extracted from the headspace by mechanically deforming the membrane into the headspace and/or applying suction using the same for vacuum appln. and delivery of inert gas.