| 摘要 |
THE CONTAINER HAS A VARIED SIZED SUBSTANCE BODY CHAMBER WITH A CHANNEL AT AN EXIT END. THIS CHANNEL IS SEALED BY A BREAKAWAY TAB AT AN END DISTANT FORM THE CHAMBER. WITHIN THE CHANNEL IS A POSITIVE SEAL VALVE THAT CAN RESEAL THE CONTAINER AFTER IT HAS INITIALLY BEEN OPENED. THIS VALVE IS COMPRISED OF AN UPPER WALL OF THE CHANNEL BEING IN A CLOSE CONTACT WITH THE LOWER WALL .THE LOWER WALL USUALLY WILL HAVE A CONCAVE SHAPE, WITH THE UPPER WALL CONTACTING THE LOWER THE CHANNEL WITH A MATING CONVEX SHAPE. HOWEVER THIS IS NOT REQUIRED WITH THE CHANNEL HAVING MANY DIFFERING SHAPES AND DIMENSIONS. THIS VALVCAN BE SEPARATED FROM THE SUBSTANCE HOLDING BODY CHAMBER BY A PORTION OF THE CHANNEL, CAN BE AT THE JUNCTION OF THE STORING CHAMBER AND THE CHANNEL OR CAN BE AT THE JUNCTION OF THE EXIT OF THE CHANNEL. WHEN A COMPRESSIVE PRESSURE IS APPLIED TO THE SUBSTANCE HOLDING CHAMBER, THE SUBSTANCE FLOWS DOWN THE CHANNEL TO THE VALVE. WHEN THE LIQUID PRESSURE REACHES A GIVEN LEVEL, THE CONCAVE UPPER WALL OF THE VALVE MOVES OUT OF CONTACT WITH THE CONVEX LOWER WALL AND SOME OF THE SUBSTANCE IS DISPENSED. UPON THE CESSATION OF PRESSURE THE CONVEX AND CONCAVE PORTIONS COME BACK INTO CONTACT TO CUT OFF THE FLOW OF THE SUBSTANCE. THIS VALVE PRODUCES A POSITIVE SEAL WHICH PROVIDES A POSITIVE SEAL FOR THE THERMOFORMED CONTAINER.
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