초록 ▼

A vapor-tight package has a deposit comprising nonmetallic, microwave-absorbing particles such as graphite dispersed in nonmetallic binder. When heated in a microwave oven, heat built up in the particles may soften and weaken the underlying packaging material, thus venting the package. When the depo

A vapor-tight package has a deposit comprising nonmetallic, microwave-absorbing particles such as graphite dispersed in nonmetallic binder. When heated in a microwave oven, heat built up in the particles may soften and weaken the underlying packaging material, thus venting the package. When the deposit itself is impervious to vapors, it can be positioned over an opening in the package, and the heat only needs to soften and weaken the deposit to vent the package.

대표청구항 ▼

A vapor-tight package including means for automatically venting through the package upon heating in a microwave oven, wherein the package comprises a sheet of thermoplastic film and a deposit of less extent than the film adhered to said sheet at the point where venting is desired to occur and compri

A vapor-tight package including means for automatically venting through the package upon heating in a microwave oven, wherein the package comprises a sheet of thermoplastic film and a deposit of less extent than the film adhered to said sheet at the point where venting is desired to occur and comprising nonmetallic, microwave-absorbing particles selected from the group consisting of graphite and carbon black dispersed in a nonmetallic binder, which deposit has a thickness within the range from 10 to 300 micrometers, said particles comprising at least 10% by weight of said deposit, the dimensions of the deposit and the concentration of the particles being sufficient to provide sufficient heating of the thermoplastic film when exposed to microwave energy to cause softening of the film sufficient to cause or allow rupture and venting of the package through the softened ruptured film without arcing.