Mold, molding machine and method for molding by extrusion blow molding
AssigneePlastic Omnium Advanced Innovation and Research
InventorJean-François Coing
Life of this patent
Estimating the term…
Abstract
A mold for manufacture by extrusion blow molding includes two parts. At least one of the parts includes at least one first section having a first molding surface including at least one primary contact region to form, by pressing, zones for fixing at least one internal component inside a parison, a second section having a second molding surface, the second section of the part of the mold being movable with respect to the associated at least one first section of the part of the mold, and at least one third section movable with respect to the associated at least one first section of the part of the mold, the at least one third section having a third molding surface including at least one secondary contact region to reduce, by pressing, a predetermined volume inside the parison.
Claims18
A mold for manufacturing by extrusion blow-molding a hollow tank body made of plastic material for a motor vehicle from a parison, the tank comprising at least one internal component fixed to an interior of the parison during the molding of the hollow body, the mold comprising two parts movable relative to one another delimiting internally, when they are closed against each other, a total molding surface intended to reproduce a predetermined shape of the hollow body to be manufactured, at least one of the parts of the mold comprises:
- at least one first section having a first molding surface of a first portion of the hollow body to be manufactured, said first molding surface comprises at least one primary contact region configured to form, by pressing, a fixing region for fixing said at least one internal component inside the parison,
- a second section having a second surface for molding a second portion of the hollow body to be manufactured, said second section of the part of the mold is movable relative to the associated at least one first section of the part of the mold at least between an intermediate closed position and a final closed position of the parts of the mold, and
- at least one third section having a third molding surface of a third portion of the hollow body to be manufactured, said third molding surface comprises at least one secondary contact region, said at least one third section of the part of the mold is movable relative to the associated at least one first section of the part of the mold at least between an intermediate position and a final position wherein the at least one secondary contact region is configured to reduce, by pressing, a predetermined volume within the parison.
A molding method for molding by extrusion blow-molding a hollow tank body made of plastic for a motor vehicle from a parison, the tank comprising at least one internal component fixed inside the parison during the molding of the hollow body, the method comprising the following steps:
- a) introducing said at least one internal component and the parison in a molten state into an open mold in two parts so that said at least one internal component is surrounded by the parison, at least one part of the mold comprising at least one first section, a second section and at least one third section internally delimiting a first molding surface, a second molding surface, and a third molding surface, respectively, of a total molding surface of the mold,
- b) moving the at least one first section of the part of the mold to bring the mold into an intermediate closed position wherein the at least one first section of the part of the mold presses the parison against said at least one internal component in order to fix said at least one internal component inside the parison, the first molding surface being configured to form, by pressing, multiple fixing regions for fixing said at least one internal component inside the parison,
- c) moving the second section of the part of the mold relative to the at least one first section of the part of the mold to bring the mold into a final closing position wherein the two parts of the mold are closed against each other and internally delimit the total molding surface intended to reproduce a predetermined shape of the hollow body to be manufactured,
- d) moving the at least one third section of the part of the mold relative to the at least one first section of the part of the mold to bring the at least one third section into a position wherein the third molding surface presses the parison in order to reduce a predetermined volume within the parison,
- e) performing a blowing of the parison by pressing said parison on the total molding surface of the mold using a pressurized gas,
- f) opening the mold to take out the manufactured hollow body.
Dependencies are inferred from the claim text.