Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Producing or treating porous product
Reexamination Certificate
2011-03-15
2011-03-15
Wyrozebski, Kat (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Producing or treating porous product
C264S545000, C264S553000, C264S248000, C264S250000, C425S463000, C425S466000
Reexamination Certificate
active
07906062
ABSTRACT:
The invention concerns a process for the production of hollow bodies of thermoplastic material by extrusion blow molding. In the process according to the invention continuous extrusion of at least two preforms in web form of plasticized material is effected by means of a plurality of extrusion devices. The preforms are jointly shaped to form a hollow body in the still plastic condition, that is to say in the first heat, within a multi-part tool forming a mold cavity. In that case a wall thickness profile is imparted to at least one preform during the extrusion operation independently of the respective other preform by continuous nozzle gap adjustment during the extrusion operation.
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Borchert Matthias
Eckhardt Joachim
Eulitz Dirk
Froitzheim Thomas
Kramer Timo
Dodds Scott W
Grossman Tucker Perreault & Pfleger PLLC
Kautex Textron GmbH & Co. KG
Wyrozebski Kat
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