Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1976-06-01
1983-01-25
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
264560, 264566, 264573, 264150, 264167, 2642094, 425532, 4253261, 425378R, 425379R, 425393, B29F 302, B29C 1707
Patent
active
RE0311332
ABSTRACT:
An improved extrusion method is provided to produce plastic tubes having at least one end thereof an increased wall thickness. The method includes the steps of continuously advancing plastic material through an extruder to form a cylinder, cooling the extruded cylinder as it passes from the extruder, periodically increasing the speed at which the plastic material is fed to the extruder relative to the speed at which the cylinder is drawn from the extruder to produce a section having an increased wall thickness and dividing the cylinder thus formed.
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S.P.E. Technical Papers, vol. IV, Paper 49, Croley et al., Jan. 4, 1958, pp. 512-522.
Niessner Rudolf
Sonnleitner Max
Thurlow Jeffery R.
Thyssen Plastik Anger KG
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