Method for making a preform consisting of at least three layers of thermoplastic material
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United States of America Patent
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Jan 12, 1988
Grant Date -
N/A
app pub date -
May 13, 1986
filing date -
May 22, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for making blow-moulded bottle from a preform consisting of at least three layers. For making the preform a tube section heated at one end is shaped by pushing into a closed bottom mould to form a bottom and pressure is exerted in the axial direction on the center bottom region to close the still present gaps in an outer layer as soon as an inner layer has flowed together.
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