Patent ID: 7077923

Claim:
A method of manufacturing an air permeable packaging bag, the method comprising the steps of: providing a first polymer film and a second polymer film, at least the first polymer film having a plurality of gaps extending through the first polymer film and being formed therein by virtue of an impression process, the gaps being configured to restrict air permeation through the first polymer film in a static state; overlapping the first and second polymer films; and performing a sealing process to seal the overlapping edges of the first and second polymer films to define an open interior and an opening for the air permeable packaging bag, wherein when the air pressure within the open interior of the packaging bag is greater than the air pressure outside of the open interior, the plurality of gaps gradually deform and open to permit the air within the open interior of the packaging bag to permeate through the first polymer film, the plurality of gaps being configured to return to the static state to restrict air permeation through the first polymer film when the air pressure outside of the packaging bag is substantially equal to or greater than the air pressure within the open interior such that the packaging bag can be reused to regulate another increase of pressure within the open interior of the packaging bag.