Method for producing hollow bodies made of plastics
AssigneeKautex Textron GmbH & Co. KG
InventorsThomas Mayer, Jochen Hild, Verena Thimm
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Abstract
A method for producing hollow bodies made of plastics by blow molding or deep drawing using a deep-drawing tool or a blow-molding tool, comprising the extrusion of preforms from thermoplastics, the method comprising a wall thickness control of the preforms, wherein a measurement of the wall thickness of the preforms takes place within the tool on the mold cavity side on at least one reference point of a preform, the measured value obtained is compared as an actual value with a predetermined target value and the wall thickness control is triggered to change the wall thickness of the preform during extrusion or between extrusion cycles depending on the deviation between the actual value and the target value.
Claims19
A method to produce hollow bodies made of plastics by blow molding, comprising:
- extruding preforms from thermoplastics from a plurality of extrusion cycles,
- providing a wall thickness control of the preforms,
- placing the preforms as plasticized preforms in an open blow-molding tool,
- forming the preforms into intermediate products within a mold cavity of the blow-molding tool using heat of plasticization from the extrusion,
- measuring a wall thickness of at least one of the intermediate products within the blow-molding tool, from a mold cavity side of the blow-molding tool, using at least one reference point of at least one of the intermediate products, to obtain a measured value which is compared as an actual value to a predetermined target value, and which triggers the wall thickness control to change a wall thickness of at least one of the preforms between the extrusion cycles depending on a deviation between the actual value and the target value.
Dependencies are inferred from the claim text.