Process to coat an injection mould
AssigneeS.I.P.A. Societa' Industrializzazione Progettazione E Automazione S.P.A.
InventorsMatteo Zoppas, Laurent Sigler, Marc Hoang
Life of this patent
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Abstract
A process to increase the diameter of a core rod (1) of an injection mould for preforms, wherein the core rod (1) has a moulding surface (2) divided in a neck finish portion (3) and a preform body portion (4), comprises the steps of: a) grinding or milling a layer from the surface of the preform body portion (4) of the core rod, b) depositing a metallic compound onto the ground portion to make a coating, c) removing the excess of coating material to bring the coated surface to a predetermined superficial roughness and to diametrical dimensions greater than the original surface profile (14) to reduce the thickness of the lateral wall of the moulded preform.
Claims16
A process to make a core rod for preforms, wherein there is provided
- a core rod having an external moulding surface being a shaping surface of an internal surface of a preform and comprising a neck shaping portion and a body shaping portion, the body shaping portion having first diametrical dimensions,
- a metallic compound,
- depositing means to deposit said metallic compound onto the core rod, and
- chip removal means,
- the process comprising the steps of:
- a) removing an outer layer of a predetermined first thickness from the body shaping portion by means of the chip removal means to obtain an intermediate surface;
- b) depositing a layer of said metallic compound of a second thickness greater than said first thickness onto the intermediate surface,
- c) performing a surface finishing operation to remove an excess of coating material and/or to bring the coated surface to a predetermined superficial roughness, whereby the body shaping portion is provided with a coating of said metallic compound so that the core rod has a final body shaping portion with second diametrical dimensions greater than said first diametrical dimensions.
Dependencies are inferred from the claim text.