US 5,851,477 AGranted

Reinforced tubing manufacture by a plastic processing screw machine

OwnerDonald N. Halgren, Desider G. Csongorinventors

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Abstract

The invention comprises a plasticating machine for the working and forcing of plastic material into a mold, said machine including an elongated housing having a first or proximal end and a second or distal end and an elongated screw shaft with a screw flight therearound, the screw shaft being rotatably supported in the elongated housing, for the working of plastic between the screw shaft and the elongated housing. At least one pair of coaxial spaced apart delivery conduits are generally longitudinally arranged through the screw shaft, from a proximal end to a distal tip end thereof. A tubular mesh generating apparatus is arranged at the distal end of the coaxially conduits to generate/weave and feed a tubular reinforcement mesh along the length of the annular delivery channel to a plastic melt at its distalmost end. A movable forming tool is supported adjacent the distal end of the innermost conduit of the coaxial conduits. The mesh is arranged to be movable with respect to the screw shaft and over the forming tool, to engage any thermoplastic material being driven from between the screw shaft and the barrel housing to form a reinforced tubular product such as a pipe or tube, as it is driven through a die at the distal end of the machine.

Claims7

Dependent claims

A method of manufacturing a reinforced thermoplastic tubular product by a plasticating screw machine, comprising the steps of:

providing an elongated rotatable screw shaft within an elongated barrel housing, and a mold or die adjacent a distal end of said housing;
arranging a longitudinally directed bore through said elongated screw shaft from a proximal end to a distal end thereof;
fitting at least one pair of spaced apart, non-rotating coaxial conduits through said bore, said conduits comprising an inner conduit and an outer conduit having proximal and distal ends, an annular delivery channel being defined between said inner and outer conduits;
arranging a mesh web generating apparatus at a proximal end of said annular delivery channel to permit a mesh web to be driven through said annular delivery channel;
generating a mesh web and driving said web through said annular channel between said spaced apart coaxial conduits;
and
feeding thermoplastic material into said barrel and rotating said screw shaft so as to plasticate said thermoplastic material and permit said material to be directed from said screw shaft and into said mesh at a distal end of said screw shaft prior to said thermoplastic material being delivered to said mold or die adjacent said distal end of said housing to form said reinforced thermoplastic tubular product.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/778,947Filed 6 Jan 1997 · continuation in part
Priority: 23 Feb 1995
Granted: 22 Dec 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification33 codes

A61M 25/0009
Catheters; Hollow probes: making of catheters or other medical or surgical tubes
A61M 25/0014
Making of catheters or other medical or surgical tubes: connecting a tube to a hub
B29C 45/1732
Introducing an auxiliary fluid into the mould: control circuits therefor
B29C 45/1734
Introducing an auxiliary fluid into the mould: nozzles therefor

Family

Serial393,200Parent of this continuation-in-part · filed 23 Feb 1995
Serial511,055Parent of this continuation-in-part · filed 3 Aug 1995
Serial773,875Parent of this continuation-in-part · filed 30 Dec 1996
US 5,744,092 AParent of this continuation-in-part
US 5,670,112 AParent of this continuation-in-part
US 5,851,477 AThis patent

From the US filing history. Foreign family members aren’t listed.