Mold, mouding machine and method for molding by extrusion blow-molding
AssigneePlastic Omnium Advanced Innovation and Research
InventorsJean-François Coing, Antoine Chaussinand
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Abstract
A mold for manufacturing, by extrusion blow-molding, containing two parts having at least a first section having a first molding surface having a plurality of contact regions configured to simultaneously form, by pressing, regions for fixing at least one internal component to the inside of a parison, and a second section having a second molding surface. The second section of the part of the mold is movable with respect to the at least one first section associated with the part of the mold.
Claims18
A method for molding by extrusion blow-molding a plastic hollow tank body 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 tank body, the method comprising:
- a) introducing at least one internal component and a molten parison into an open mold in two parts so that said at least one internal component is surrounded by the parison, at least one of the two parts of the mold comprising at least one first section and a second section internally delimiting a first molding surface and a second molding surface, respectively, of a total molding surface of the mold;
- b) moving the at least one first section of the at least one of two parts of the mold to bring the mold into an intermediate closing, wherein the at least one first section of the at least one of two parts 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 at the same time, by pressing, a plurality of regions for fixing said at least one internal component inside the parison;
- c) moving the second section of the at least one of two parts of the mold relative to the at least one first section of the at least one of two parts of the mold to bring the mold into a final closing position, wherein the two parts of the mold are closed against each other by internally delimiting the total molding surface for reproducing a predetermined shape of the hollow tank body to be manufactured;
- d) performing a blowing of the parison by placing said parison on the total molding surface of the mold by introducing a pressurized gas;
- and
- e) opening the mold to take out a manufactured hollow body,
- wherein a pressurized gas is introduced inside the parison to pre-blow said parison between the introducing and the moving.
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 tank body, the mold comprising:
- two parts movable relative to one another delimiting internally, when they are closed against each other in a final closing position, a total molding surface intended to reproduce a predetermined shape of the hollow tank body to be manufactured, at least one of the two parts of the mold comprising:
- at least one first section having a first molding surface of a first portion of the hollow tank body to be manufactured, said first molding surface comprising at least one contact region configured to form, by pressing obtained by moving the at least one first section towards an intermediate closing position of the two parts, a region for fixing said at least one internal component inside the parison, and
- a second section having a second surface for molding a second portion of the hollow tank body to be manufactured,
- wherein the second section of the at least one of the two parts of the mold is movable relative to the at least one first section of the at least one of the two parts of the mold at least between the intermediate closing position and the final closing position of the parts of the mold, and
- wherein the first molding surface of the at least one of the two parts of the mold comprises a plurality of contact regions and is configured so that the contact regions form at the same time, by pressing obtained by moving the at least one first section towards the intermediate closing position of the two parts, a plurality of regions for fixing said at least one internal component inside the parison, and
- wherein the at least one internal component is attached to the parison by pressure between the first section of the first part and the second part.
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 tank body, the mold comprising:
- two parts movable relative to one another delimiting internally, when they are closed against each other in a final closing position, a total molding surface intended to reproduce a predetermined shape of the hollow tank body to be manufactured, at least one of the two parts of the mold comprising:
- at least one first section having a first molding surface of a first portion of the hollow tank body to be manufactured, said first molding surface comprising at least one contact region configured to form, by pressing obtained by moving the at least one first section towards an intermediate closing position of the two parts, a region for fixing said at least one internal component inside the parison, and
- a second section having a second surface for molding a second portion of the hollow tank body to be manufactured,
- wherein the second section of the at least one of the two parts of the mold is movable relative to the at least one first section of the at least one of the two parts of the mold at least between the intermediate closing position and the final closing position of the parts of the mold, and
- wherein the first molding surface of the at least one of the two parts of the mold comprises a plurality of contact regions and is configured so that the contact regions form at the same time, by pressing obtained by moving the at least one first section towards the intermediate closing position of the two parts, a plurality of regions for fixing said at least one internal component inside the parison, and
- wherein the at least one first section and/or the second section of the at least one of the two parts of the mold comprises a cooling device to cool a portion of the hollow tank body.
Dependencies are inferred from the claim text.