Title:
METHOD AND DEVICE FOR PRODUCING HOLLOW ARTICLE FROM THERMOPLASTIC SYNTHETIC RESIN
Document Type and Number:
Japanese Patent JPS52115870
Kind Code:
A
Abstract:
A parison of thermoplastic material is extruded through a nozzle, preliminary to blowing, the parison being receivable in a closable blowmold. The portions of the parison which are clamped in the blowmold should have a uniform thickness and, to compensate for different degrees of stretch at various locations, the parison-producing nozzle head is formed with a plurality of flaps or rollers selectively displaceable into the thermoplastic stream to reduce the wall thickness of the emerging parison. According to the invention, the wall thickness of the parison is only partially reduced at predetermined locations about the periphery, during predetermined time intervals in the course of the parison-extrusion process.
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Inventors:
FURANTSU GARUBUIO
Application Number:
JP2613877A
Publication Date:
September 28, 1977
Filing Date:
March 11, 1977
Export Citation:
Assignee:
ELBATAINER KUNSTSTOFF
International Classes:
B29C49/00; B29B7/00; B29B11/10; B29C48/09; B29C48/30; B29C48/32; B29C48/325; B29C48/92; B29C49/04; B29C49/78; B29C65/00; (IPC1-7): B29D23/03; B29D23/04