Skin package obtd. from a buried base and a covering foil - by placing an article to be packaged between foil and base, evacuating and sealing

摘要

An article to be skin wrapped is placed between a burled base and a covering foil. The foil is then placed against the base; the air between foil and base is evacuated through channels formed between the burled base and the covering foil; and foil and base are finally sealed together. The base specif. comprises a laminated foil enclosing air bubbles between two component foils. These air bubbles protrude in direction towards the covering foil and are caused to burst when the covering foil is pressed against the base. The channels do not get "blocked" when vacuum is applied, so satisfactory evacuation of air is always ensured. Since the individual spaces formed by the air bubbles are rel. small, the covering foil will always closely hug the base when being sealed to it.