Process for heat sealing packages
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United States of America Patent
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May 14, 1991
Grant Date -
N/A
app pub date -
Nov 9, 1989
filing date -
Nov 9, 1989
priority date (Note) -
Expired
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Abstract
A sealing process for producing clean, contamination-free seals. The process includes the step of incorporating a small amount of polar liquid within the material to be sealed between heat-sealable layers. An alternating electromagnetic energy field, such as that produced by a dielectric heating device, is applied to the seal area. The energy vaporizes the polar liquid, thereby cleaning the seal area. Subsequently, the energy causes the resinous layers to seal together, sealing the material within the package. A preferred composition for sealing within the resinous package is also disclosed. The material includes a polar liquid, a surfactant, wax, oil and microbeads. The material is especially suited for producing padding devices.
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