Apparatus for molding particulate expandable thermoplastic resin material using microwave heating
AssigneeIsobox-Barbier
InventorJoel Soulier
Life of this patent
Estimating the term…
Abstract
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.
Claims18
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.
A mold assembly 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 the 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 mold body is made of a material which is essentially transparent to or transmissive of microwave radiation;
- means for applying microwave radiation to said mold body;
- and
- means disposed within and connected to said resonant cavity wall members for circulation of heat-exchange fluid, in operative association with the mold body.
An apparatus for molding particulate expansible plastic dielectric material by microwave radiation, the apparatus comprising:
- a press;
- a resonant cavity, having wall members, formed within the press,
- at least one mold body within the resonant cavity, 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 resin containing microwave radiation-conducting carbon black which has a high dielectric loss and which is microwave-absorbent and wherein the remaining portion of the mold body is made of material which is essentially transparent to or transmissive of microwave radiation;
- and
- means for applying microwave radiation to said mold body.
Dependencies are inferred from the claim text.