Pipes and tubular conduits – Flexible – Braided – interlaced – knitted or woven
Reexamination Certificate
1998-06-15
2001-01-09
Hook, James (Department: 3752)
Pipes and tubular conduits
Flexible
Braided, interlaced, knitted or woven
C138S033000, C138S130000, C138S133000, C138S153000, C138S174000
Reexamination Certificate
active
06170533
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to a steel-plastic composite pipe component, and specifically to a wire-mesh reinforcement-plastic composite pipe component and method for making the same.
BACKGROUND OF THE INVENTION
Plastic pipes have been widely used in many fields due to good corrosion resistance, light weight and convenience of installation. However, applications in the industrial field are limited because of lower mechanical strength, lower rigidity and decreased heat-resistance over standard metal pipes. There are numerous configurations of pipe and methods of manufacturing same found in the prior art that have been designed to provide increased mechanical strength, increased rigidity, and greater heat-resistance over plastic pipes.
One example is described in U.S. Pat. No. 3,242,691 to Robinson et al., which describes a method of producing a pipe that includes a flexible shaft assembly including a flexible rotatable metal core, an inner plastic tubing sized to receive the metal core, a plurality of metallic wires helically wound in one direction, and a second plurality of metallic wires helically wound in the opposite direction.
Another example is described in U.S. Pat. No. 3,460,578 to Schmid, which describes a composite flexible shaft casing including an inner plastic liner, a wire braid having wires helically wound to form interstices between the wires, an outer covering extruded over the wire braid and passing through the interstices to engage the liner, and a plurality of axially extending ribs or projections.
U.S. Pat. No. 3,526,692 to Onaka describes a mechanism for continuously coiling wire into a helix and feeding the helix axially through a plastic extruding die where a plastic pipe body is extruded so that the wire helix is embedded in but projects from the outer surface of the pipe body. The pipe body is then passed through a second plastic extruding die in which a tubular plastic layer is bonded to the outer surface of the pipe body.
U.S. Pat. No. 4,258,755 to Higbee describes a flexible reinforced cured resin hose including a combination of helically wound cable wires and body wires embedded therein. Two plies of wires are wrapped in opposite directions around the periphery of a liner tube supported on a mandrel, the plies being supported in a resin filler layer applied over the liner to hold the wires spaced apart.
Yet another example is found in U.S. Pat. No. 4,657,049 to Fourty et al., which describes a reinforced composite tubular body including a metallic reinforcement of helical convolutions completely embedded in a tubular body of thermosetting polymer which has a coefficient of elongation at rupture less than 15%.
Another example of a steel skeleton-plastic composite pipe is described in China Patent 94104509. The pipe described in China Patent 94104509 has distinct advantages over plastic pipes and over other steel-plastic composite pipes known to those skilled in the art, including increased mechanical strength, increased rigidity, and a greater heat resistance. The steel skeleton according to that patent is constructed by both longitudinal and traverse reinforcing wires, and the amount of both longitudinal reinforcing wires and traverse reinforcing wires in the steel skeleton are 50% respectively. To increase the strength of the pipe, the diameter of the transverse reinforcing wire is increased. This results in increasing the wall thickness of the composite pipe.
The devices and methods described in the prior art achieve a certain degree of success in increasing mechanical strength, increasing rigidity, and providing greater heat tolerance in pipe. However, it would be desirable to increase the mechanical strength of a component pipe without significantly increasing the wall thickness. It would also be desirable to provide a method of manufacture of not only composite straight pipe, but also composite pipe components, wherein the method of manufacture offers significant savings in the cost of manufacture.
SUMMARY OF THE INVENTION
It is therefore one object of the invention to provide a composite pipe and components having improved pressure resistance.
It is another object of the invention to provide a composite pipe and components that have improved mechanical strength while maintaining a smaller wall thickness.
Another object of the invention is to provide a composite pipe that has a low hydraulic loss.
Yet another object of the invention is to provide a highly efficient and low cost method for making a composite pipe.
These and other objects are attained by a wiremesh reinforcement-plastic composite pipe and components. The pipe has a wiremesh reinforcement-plastic composite construction that includes a first and second spiral reinforcing wire layer. The first spiral reinforcing layer has grooves formed at selected intervals, and the second spiral reinforcing wire layer is pressed into the grooves. The first and second spiral reinforcing wire layers are deformed and joined together by pressure to form a wiremesh reinforcement. The two spiral reinforcing wire layers have a left and right spiral angle &agr;
1
and &agr;
2
respectively relative to the central line, the left and right spiral angles &agr;
1
and &agr;
2
can change in the range of 0° to 90°. Thermoplastic penetrates the wiremesh reinforcement and fills both sides of the wiremesh reinforcement to form the composite pipe or component.
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Hook James
Starway Pipelines Technology Inc.
Wall Marjama & Bilinski
LandOfFree
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