Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1994-09-13
1996-12-03
Thurlow, Jeffery R.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156187, 156203, 15624414, 15624417, 156466, 228 11, 264469, 264 83, 26417114, 26417127, 425113, 4251331, B29C 4702, B29C 4726
Patent
active
055804055
ABSTRACT:
An extrusion assembly for extrusion of a triple walled (plastic/metal/plastic) pipe includes
a first extrusion apparatus, for extruding an inner plastics layer of the pipe, having an extruder with a coaxial outer extrusion sleeve and inner extrusion die,
a shaping sleeve surrounding and substantially coaxial with the extruder, which shaping sleeve is capable of shaping a U-section form metallic layer passing through it into a tubular configuration and a welder for welding the metallic layer of tubular configuration to provide a metal tube,
a conduit for supplying a pressurized gas internally of the pipe whereby extruded plastics material emerging from the first extrusion apparatus is forced against an internal surface of the metal tube, and
a second extrusion apparatus, for extruding an outer plastics layer of the pipe, having a body part and a supply channel within the body part for supplying plastics material,
which extrusion assembly has at least one of,
(a) an essentially annular section recess in the body part of the second extrusion apparatus capable of receiving an end of the shaping sleeve, thus allowing accurate positioning of the shaping sleeve relative to the first and second extrusion apparatuses, and
(b) a universal joint to which the extruder of the first extrusion apparatus is operatively connected, which connection is adjustable to allow accurate positioning of the exit orifice of the first extrusion apparatus relative to the exit orifice of the second extrusion apparatus.
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Avondale Property (Holdings) Limited
Thurlow Jeffery R.
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