Injection mold with surface coating of the inner surface
AssigneeS.I.P.A. Societa' Industrializzazione Progettazione E Automazione S.P.A.
InventorsMatteo Zoppas, Laurent Sigler, Dino Enrico Zanette
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Abstract
A blow mold for PET bottles has the inner surface which contacts the hot PET during the blowing operation, coated with a layer of ceramic material having a nanometric thickness, of which at least one thickness layer is AI2O3 and/or TiO2 deposited by ALD technique. Due to this technique, the PET preforms are subject to less friction during the contact with the interior of the mold.
Claims4
A mold having steel walls for the production of preforms made of polyethylene terephthalate, PET, by injection molding, comprising a coating of ceramic material with a thickness between 90 and 120 nm which coats the walls of the mold, wherein the coating is made of either a layer of Al2O3 or a multilayer structure having a first layer made of Al2O3 and a second layer made of TiO2, the mold producing the preforms with L/t>50, when L>100 mm or preforms with L/t>45 when L<100 mm, where “L” and “t” are the total length of the preform and the wall thickness of the preform, respectively.
Dependencies are inferred from the claim text.