Hermetic packages with laser scored vent systems
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United States of America Patent
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Apr 1, 2014
Grant Date -
Jul 7, 2011
app pub date -
May 20, 2009
filing date -
Jun 10, 2008
priority date (Note) -
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Abstract
A hermetically sealed package, for example a freezable, microwavable package containing a food product, having a sealing film that includes a vent system that is scored by a laser into the package. The vent system includes at least one linear or non-linear vent pattern scored into a portion of the outer surface of the sealing film so as to form at least one weakened wall pattern. According to certain embodiments, the vent pattern may be scored by a laser to a depth that does not perforate the sealing film. The inner surface of the sealing film that is adjacent to the weakened wall pattern is directly exposed to pressure that is generated in the inner region of the package during heating. According to some embodiments, the vent pattern may have a vent pattern span that is approximately 1% to 50% of the size of the inner region span.
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