Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1979-05-18
1981-09-08
Michl, Paul R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
264554, B29C 1704
Patent
active
042884012
ABSTRACT:
Method and apparatus for stretch-forming a hollow article from a sheet of thermoplastic material at a temperature higher than 25.degree. C. below the melting point wherein a stretching tool having at least one tip at a temperature lower than 50.degree. C. below the melting point is pressed against the sheet, and the initially stretched sheet is then further stretched and simultaneously dilated. One form of tool comprises a number of blades arranged around a plunger which are moved forward and outwardly after initially stretching the sheet forwardly. The articles so produced can be further formed by blow moulding.
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patent: 3341893 (1967-09-01), Edwards
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patent: 4088718 (1978-05-01), Mulvany
patent: 4105736 (1978-08-01), Padovani
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patent: 4172875 (1979-10-01), Beijen
Flecknoe-Brown Anthony
Keith Donald G.
ICI Australia Limited
Michl Paul R.
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