Method for fabricating synthetic-material molded parts through blow molding
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United States of America Patent
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Dec 31, 2002
Issued Date -
N/A
app pub date -
Aug 23, 1999
filing date -
Feb 21, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for fabricating synthetic-material molded parts through extrusion blow molding, produces sharp-edged, strong contours and/or undercuts in the region of break-throughs. A synthetic-material tube introduced into the blow-molding die is initially widened by pneumatic pressure, shaped and held on smooth or slightly contoured surfaces of the blow-molding die. However, strong, sharp-edged contours are shaped by mechanical pressure exercised on an outer surface of the synthetic-material tube by a shaping tool. A device for carrying out the process has a blow-molding die with a wall in which shaping slides are guided in one or more parts that can be guided in the interior of the blow-molding die and have sliding parts which can be driven independently of each other or in synchronism.
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