Production of containers with recycling by twin-screw extruder
AssigneeSidel Participations
InventorYves-Alban DUCLOS
Life of this patent
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Abstract
The invention relates to the manufacture of hollow objects made of plastics material by way of an extruder. In order to improve the quality of the manufactured objects and the regularity of manufacture, the extruder that is fed at least with the initial metered quantity and to which at least a part of the molded blanks and/or of the molded and heated blanks used for manufacturing said objects and/or of the finally manufactured objects will be recycled is a twin-screw extruder.
Claims11
A method for manufacturing hollow objects made of plastics material by way of an extruder, the method comprising steps in which:
- respective quantities of virgin plastics material and additives are metered in order to obtain a metered mixture,
- the extruder (1) is fed at least with the metered mixture in order to obtain an extruded mixture,
- the extruded mixture is molded in order to obtain molded blanks (73),
- the molded blanks are heated so that they can be blow-molded,
- the heated blanks are blow-molded in order to convert them into hollow objects,
- between at least some of the successive steps of molding, heating and blow-molding, the quality of the molded blanks and/or of the heated blanks (73) and/or of the blow-molded hollow objects (115) is checked,
- if a predefined quality threshold has been reached, the method passes to the next step, and if not, at least a part of the molded blanks and/or of the heated blanks and/or of the blow-molded hollow objects is recycled to the extruder (1), after they have been ground, wherein the extruder (1) that is fed at least with the metered mixture and to which at least a part of the molded blanks (73) and/or of the heated blanks and/or of the blow-molded hollow objects (115) is recycled is a twin-screw extruder.
A method for producing and conditioning containers made of plastics material by way of an extruder, the method comprising steps in which:
- respective quantities of virgin plastics material and additives are metered in order to obtain a metered mixture,
- the extruder (1) is fed at least with the metered mixture in order to obtain an extruded mixture,
- the extruded mixture is molded in order to obtain molded blanks,
- the molded blanks are heated so that they can be blow-molded,
- the heated blanks are blow-molded in order to convert them into containers,
- the containers are collected and at least one of the following operations is carried out therewith or thereon:
- filling, capping, labeling, bundling,
- between at least some of the successive steps of molding, heating and blow-molding, the quality of the molded blanks and/or of the heated blanks and/or of the blow-molded containers (115) is checked,
- if a predefined quality threshold has been reached, the method passes to the next step, and if not, at least a part of the molded blanks and/or of the heated blanks and/or of the blow-molded containers is recycled to the extnider, after they have been ground, wherein the extruder (1) that is fed at least with the metered mixture and to which at least a part of the molded blanks and/or of the heated blanks and/or of the blow-molded containers is recycled is a twin-screw extruder.
Dependencies are inferred from the claim text.