초록 ▼

Molding of expanded plastic material such as dielectric material by microwave radiation is effected in a mold in which the part of the mold which contacts the material to be molded is of a material having high dielectric losses and capable of absorbing microwave radiation. Such mold portion preferab

Molding of expanded plastic material such as dielectric material by microwave radiation is effected in a mold in which the part of the mold which contacts the material to be molded is of a material having high dielectric losses and capable of absorbing microwave radiation. Such mold portion preferably comprises a resin containing a small amount of carbon black.

대표청구항 ▼

A device for molding particulate expansible plastic dielectric material by microwave radiation, which comprises: a mold body, in combination with a press and a resonant cavity having wall members wherein the mold body includes a first portion comprising wall surfaces which define the mold cavity and

A device for molding particulate expansible plastic dielectric material by microwave radiation, which comprises: a mold body, in combination with a press and a resonant cavity having wall members wherein the mold body includes a first portion comprising wall surfaces which define the mold cavity and which contact said plastic material to be molded said portion being formed of a resin containing microwave radiation-conducting carbon black which has high dielectric losses and which is microwave-absorbent and wherein the remaining portion of the mold body is made of a material which is essentially transparent to or transmissive of microwave radiation; and means for applying microwave radiation to said mold body.