Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Mica flake
Patent
1994-03-29
1997-01-21
Ryan, Patrick
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Mica flake
428 341, 428 345, 428 346, 428 347, 428 3691, 428 3692, B31C 300, B31C 304, B29D 2322
Patent
active
055958001
DESCRIPTION:
BRIEF SUMMARY
This invention relates to improvements to reinforced ribbed structures, and in particular to reinforced or strengthened spirally wound pipes or tubes made from composite materials.
It is well known that plastic pipes can be made by spirally winding a plastic strip having a series of spaced apart upstanding ribs extending longitudinally of the strip, either at room temperature or at an elevated temperature where the plastic becomes more flexible. This form of helically wound tube is already well known in the industry and is described in Patents by the same inventor relating both to the form of the plastic strip and the form of the machine by means of which the pipes or tubes are produced from such strips.
For these pipes to perform in a high performance application, in order to attain the necessary degree of strength, the wall thickness of the plastic strip must be quite substantial, as well as that of the ribs, or the finished pipes or tubes can be reinforced with strengthening or reinforcing members. In this regard reference is made to the applicant's Australian Patent 607431 which discloses a method of producing a reinforced plastics tube utilising a reinforcing member placed between the ribs in such a manner that the deflection resistance of the finished pipe or tube is materially increased. The reinforcing member comprises a metal strip of U-shape cross-section, the free ends of the reinforcing member being designed to engage beneath opposed flange formations of a pair of adjacent ribs to thereby lock the metal strip in position between the ribs and in turn stiffen the ribs and the finished pipe. As explained in the aforesaid Patent specification, in applications where the reinforced tubes or pipes are buried in a trench or subjected to high earth loads, the strength of the pipe or tube is of extreme importance.
An object of the present invention is to provide certain improvements, beyond those disclosed in the aforesaid Patent Specification 607431, to reinforced spirally wound plastics tube or pipe, which are effective to stiffen the tube or pipe through the addition of reinforcing members formed of recycled low cost plastics material or of metal (or both) to thereby produce a composite plastics structure.
It is another object of the present invention to provide a spirally wound plastics pipe formed of two or more materials having different characteristics so that the resultant or finished pipe or tube has enhanced properties, and which can be produced at relatively low cost.
According to one embodiment of this invention, there is provided a helically or spirally wound composite tube or pipe produced by helically winding a strip of plastics material and interengaging the adjacent edges of adjacent convolutions of the strip, wherein the strip comprises an array of lengthwise extending ribs spaced apart across the width of the strip so as to form therebetween a series of open longitudinally extending side by side channels, each of at least some of said ribs having flange formations at or near its free end to strengthen such ribs, each of the flange formations being separated from the flange formation on any adjacent rib, characterised by at least one non-planar elongate helical reinforcing member located between a pair of said ribs within the array, the marginal edges of the reinforcing member interlocking with the flange formations of the ribs of said pair, said reinforcing member having a central body portion of inverted U- or V-shaped cross-section which has a radial height greater than the height of said ribs whereby the effective external diameter of the composite tube or pipe is substantially increased. With this arrangement, a composite plastic pipe of extremely high stiffness can be produced.
The reinforcing member can be applied during the winding of the tube, and can be fed continually or at required intervals so that a plurality of separate helical members are spaced along the length of the tube being wound. Alternatively the reinforcing member can be wound around the tube after it has been f
REFERENCES:
patent: 3996783 (1976-12-01), Meserole
Rib Loc Australia Pty Ltd.
Ryan Patrick
Weisberger Rich
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