Vacuum seal indicator for food preservation bags

摘要

Sealable plastic bag with a vacuum indicator is comprised of first and second sheets, each formed of a thin flexible plastic membrane. At least one perforation is formed in the first sheet. An indicator is disposed on the first sheet over the at least one perforation. The indicator is comprised of a resilient material which forms a resilient convex protrusion on an external surface of the bag. The convex protrusion defines a chamber which is airtight except for the at least one perforation. A containment structure is associated with the perforation to inhibit migration of particles from the interior compartment into the chamber. The resilient material is responsive to an air pressure differential as between the interior compartment and an environment external of the interior compartment to collapse the convex protrusion under a predetermined pressure differential condition.

主权项

1. A sealable plastic bag, comprising:
first and second sheets, each formed of a thin flexible plastic membrane; each of the first and second sheets respectively having a substantially rectangular shape which defines four linear sheet edges; first, second and third seals respectively formed along the length of three of the four linear sheet edges which attach the first sheet directly to the second sheet to partially enclose an interior compartment of a bag and define an opening to the interior compartment between the first and second plastic sheets along the fourth linear sheet edge; at least one perforation formed in the first sheet spaced apart from the opening and each of the first, second and third seals; an indicator of vacuum pressure disposed on said first sheet over the perforation, the indicator comprised of a resilient material which forms a resilient airtight convex protrusion on an external surface of the bag to define a chamber; a containment structure associated with the perforation to inhibit migration of particles from the interior compartment into the chamber; and wherein said resilient material is responsive to an air pressure differential as between said interior compartment and an environment external of said interior compartment to collapse said convex protrusion under a predetermined pressure differential condition.