One-way valve for food packages

A food package for at least one of cooking, storing and heating of ready-to-eat food, the food package comprising a food container and a plastic film for sealing the food package from ambient air, the plastic film including an aperture,

• wherein said food package further comprises a one-way valve covering said aperture, said one-way valve comprising:
• a first membrane having a top surface and a bottom surface, the first membrane having a first surface area;
• a second membrane having a proximal surface and a distal surface, the second membrane having a second surface area smaller than the first surface area, wherein the distal surface is coated with an adhesive and the proximal surface is fixed to the bottom surface of the first membrane such that a peripheral edge of the second membrane aligns with or extends past a peripheral edge of the first membrane;
• and
• wherein the one-way valve is arranged on said plastic film so that the second membrane covers the aperture whereby a canal is formed between the food package and the second membrane when a gas pressure inside the food package exceeds a threshold value, said canal extending from said aperture to the peripheral edge of the first membrane along said second membrane.

A method for manufacturing a one-way valve for mounting over an aperture formed on a food package for at least one of cooking, storing and heating of ready-to-eat food, said method comprising:

• providing a first membrane having a top surface and a bottom surface, the first membrane having a first surface area;
• providing a second membrane having a proximal surface and a distal surface, the second membrane having a second surface area smaller than the first surface area;
• coating the distal surface of the second membrane with a first adhesive;
• coating the bottom surface of the first membrane with a second adhesive, the first adhesive having lower adhesion than the second adhesive;
• fixing the proximal surface second membrane to the bottom surface of the first membrane, such that a peripheral edge of the second membrane aligns with or extends past a peripheral edge of the first membrane.