FIELD: packaging equipment, particularly disposable valves for packages to be heated in microwave oven.
SUBSTANCE: valve may be opened under the action of excessive pressure generated inside package during heating thereof. Valve comprises package orifice and adhesive layer located over the orifice. The valve may emit sound signal as above excessive pressure is applied thereto.
EFFECT: possibility to determine heating time necessary for product cooking inside the package.
8 cl, 4 dwg
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