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US 11,633,886 B2Granted
Method for manufacturing a polymer article
AssigneeKeiryo Packaging SA
InventorJohan Robbrecht
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AssigneeKeiryo Packaging SA
InventorJohan Robbrecht
Estimating the term…
A method enabling the selection, modification and/or creation of polymer materials which can provide improved response to the application of local shear and/or extensional deformation inside the polymer melt in manufacturing technologies including injection molding, injection stretch blow molding, direct injection, extrusion blow molding, sheet extrusion, thermoforming, etc., is provided. A method for manufacturing a polymer article includes injecting or extruding molten polypropylene, polyethylene or polyester based polymer for converting it into semi-final shape while applying shear and/or extensional deformation on the polymer melt. Applying shear and/or extensional deformation on the polymer melt includes selectively modifying the flow path of the molten semi-crystallizable polymer as a function of local pressure profile over at least part of the flow path. Local pressure profile is a function of optimized response of the polymer melt to the applied local shear and/or extensional deformation over at least the part of the flow path.
A method for manufacturing a polymer article comprising injecting or extruding a molten semi-crystallizable polymer as a polymer melt in a flow path for converting it into a shape, said semi-crystallizable polymer having an applied Weissenberg number of at least 0.125 for extruding and at least 0.187 for injecting and a Deborah number of at least 0.25 for extruding and at least 0.375 for injecting, wherein the semi-crystallizable polymer has a MFR between at-least 0.08 and 100 g/10 min or a MW between 35000 and 143000 g/mol.
A method for manufacturing a polymer article comprising injecting or extruding a molten semi-crystallizable polymer selected from the group consisting of polypropylenes, polyethylenes and polyesters as a polymer melt in a flow path for converting it into a shape, said semi-crystallizable polymer having an applied Weissenberg number of at least 0.125 for extruding and at least 0.187 for injecting and a Deborah number of at least 0.25 for extruding and at least 0.375 for injecting, wherein the semi-crystallizable polymer has a MFR between at-least 0.08 and 100 g/10 min or a MW between 35000 and 143000 g/mol.
Dependencies are inferred from the claim text.