Gas permeable molds

Details Gas permeable molds Gas permeable molds

B - Operations, Transporting

29

C

B29C 33/10 (2006.01) B29C 44/34 (2006.01) B29C 45/34 (2006.01) B29C 51/36 (2006.01)

Patent

CA 2572270

Gas permeable molds and mold segments having open porosity (60) are disclosed. Blind vents (56) in the mold wall's (54) outside surface (52) allow for an uninterrupted molding surface (62) while enhancing the gas permeability provided by the open porosity (60). Methods of making such gas permeable molds include forming them from sintered material. Methods also include the use of solid free-form fabrication followed by sintering. Also disclosed are unitary structures (150), for use in EPS bead molding, having a steam chest portion (152) with gas impermeable walls (156) and a mold section (154) having a gas permeable mold wall (172) having open porosity (176), and, optionally, open and/or blind vents (180, 178). Methods for making such unitary structures (150) include the use of solid free-form fabrication.

L~invention concerne des moules et des segments de moules perméables aux gaz dotés d~une porosité ouverte (60). Des évents borgnes (56) dans la surface extérieure (52) de la paroi (54) d~un moule permettent de former une surface de moulage ininterrompue (62) tout en améliorant la perméabilité aux gaz assurée par la porosité ouverte (60). Ces moules perméables aux gaz peuvent être fabriqués à partir d~un matériau fritté. D~autres procédés consistent également à utiliser une fabrication SFF suivie d~un frittage. L~invention concerne également des structures unitaires (150) destinées à être utilisées dans le moulage aux perles d~EPS et comportant une portion de boîte à vapeur (152) dotée de parois imperméables aux gaz (156) et une section de moule (154) dotée d~une paroi de moule perméable aux gaz (172) et d~une porosité ouverte (176), et, éventuellement, des évents ouverts et/ou borgnes (180, 178). Ces structures unitaires (150) peuvent être fabriqués à l~aide d~un procédé SFF.

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