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US 5,814,254 AGranted
Injection molding method for soles having a treading surface with colored sections and produced with expansible and cross-linking "EVA"compounds
AssigneeFinproject-S.p.A.
InventorBruno Bisconti
Life of this patent
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Abstract
This invention concerns an injection molding process for soles having a colored treading surface produced with expansible and cross-linking "EVA" compounds involving the use of colored inserts molded with the same molding material used for sole, but of a different color, fed into cups on the bottom of the mold impression and shut by caps also molded in the same material used to mold the soles.
Claims16
A molding method, comprising the steps of:
- providing a mold with a cup portion defined at least in part by a rib;
- fitting an insert in said cup portion of said mold, said insert being formed of a first molding material;
- fitting a cap on said cup portion of said mold, said cap being formed of a second molding material;
- closing said mold;
- injecting into said mold a third molding material;
- causing the first molding material of the insert and the second molding material of the cap to reach a molten state;
- and
- opening the mold after a time that ensures crosslinking and decomposition of expanding fillers simultaneously in the injected third molding material, a molten mass of the insert and a molten mass of the cap.
5 more elements
Dependencies are inferred from the claim text.