Tire mold and process for making the mold
AssigneeCompagnie Generale Des Etablissements Michelin - Micheline & Cie
InventorPaul Vandenberghe
Life of this patent
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Abstract
The tire mold having a surface 5 of open porosity which covers at least in art certain of the molding surfaces 10 and 20 in order to assure the venting of the mold.
Claims15
A tire mold comprising several elements, each having a molding surface, which elements, in closed mold position, define a cavity corresponding to the tire to be molded, and vent paths connecting the said cavity to a volume outside the mold, at least one of these elements having a molding surface constituted of a nonporous solid material, the molding surface of which has at least in part a surface film of porous structure of slight thickness with open porosity, the pores of which on the surface of the mold are of a size less than 0.05 mm, said porous structure being connected with at least one of the vent paths, the value R.sub.a of the roughness of the surface film being less than 6 .mu.m and the value R.sub.t being less than 40 .mu.m.
A method of producing a tire mold element in which liquid aluminum is poured or injected on a mold for producing the tire mold element and in which, before the pouring or injecting of the aluminum, the mold is covered with a porous film of slight thickness and open porosity, whereupon the aluminum is injected or poured and, after it has solidified, the tire mold element is removed, the tire mold element retaining the film of slight thickness and open porosity, the value R.sub.a of the roughness of the film being less than 6 .mu.m and the value R.sub.t being less than 40.mu.m.
A tire mold comprising molding surfaces enclosing a mold cavity, vent paths establishing communication between the mold cavity and an ambient atmosphere, and a surface film of porous structure defining pores on the molding surfaces which establish gas passages between the molding surfaces and the vent paths to remove gases from the mold cavity to the ambient atmosphere, the value R.sub.a of the roughness of the surface film being less than 6 .mu.m and the value Rt being less than 40 .mu.m.
Dependencies are inferred from the claim text.