Packages made with both high-frequency/radio-frequency seals and conventional heat/pressure seals using combinations of polar and non-polar polymers
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United States of America Patent
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Jun 23, 1998
Grant Date -
N/A
app pub date -
Aug 13, 1996
filing date -
Aug 13, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A package having multiple seals in close proximity is set forth. At least one of the seals is accomplished through the use of a polar polymer that bonds to an opposing panel in the package when exposed to an alternative electromagnetic field. The strength of the sealing can be controlled by the type and the amount of the polar polymer that is present as well as the field strength of the electromagnetic radiation, and its duration. The region to be sealed by the electromagnetic radiation can also be precisely controlled.
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