B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1201, 18/655
B29C 33/38 (2006.01) B29C 35/08 (2006.01)
Patent
CA 1179470
ABSTRACT OF THE DISCLOSURE Novel molds are provided herein which are suitable for the manufacture of expanded, non-polar plastic articles by means of UHF radiation. The molds comprise at least two juxtaposed porous materials which together define a mold cavity, the first of at least two juxtaposed porous materials forming one or more zones A fronting on the surface of the mold cavity, the zones A having capillary forces which allow vapor developed in the interior of the cavity to escape from it into the mold, and the second of at least two juxtaposed porous materials forming one or more zones B fronting on the surface of the mold cavity, the zones B having capillary forces which bring liquid from the interior of the mold to the mold cavity, thereby creating a harmonious liquid-vapor circulation. The molds also comprise an impervious layer on the opposite side of at least two juxtaposed porous materials from the mold cavity, the imper- vious layer serving to prevent or to retard loss of liquid from the mold and which thereby cooperates with at least two juxtaposed porous materials to create the harmonious liquid-vapor circulation. These novel molds are useful for the manufacture of expanded plastics articles.
385541
Borden Ladner Gervais Llp
Isobox S.a.
LandOfFree
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