Pipes and tubular conduits – Flexible – Braided – interlaced – knitted or woven
Reexamination Certificate
2000-05-26
2001-10-16
Hook, James (Department: 3752)
Pipes and tubular conduits
Flexible
Braided, interlaced, knitted or woven
C138S137000, C138S141000, C138S153000, C138SDIG001
Reexamination Certificate
active
06302151
ABSTRACT:
The present invention relates to a flexible hose of multilayer plastics material for carrying fluids, e.g. for the purpose of being fitted in fixed or moving installations for distributing potable water.
BACKGROUND OF THE INVENTION
At present, elements for fitting in circuits for distributing potable water, e.g. pipes, faucets, or couplings, need to receive health standards approval at two levels. At a first level, the elements can be used only in applications where it comes into contact with the transported potable water for short durations only, possibly in repeated manner. In the second level, the element is suitable for use in any application concerned with transporting potable water, and in particular applications where water is continuously in contact with the element.
All pipes complying with second level are rigid in structure. Thus, such pipes are known that are made of special rigid polyethylene, polypropylene, or polyvinyl chloride that are inert both chemically and physically relative to the potable water being transported. Such pipes are easy to manufacture and of low cost, so they are in widespread use in distribution installations. Nevertheless, the rigidity of such plastic material pipes puts limits on installation thereof and maintenance thereof.
There thus exists a need that is not conveniently satisfied at present for a pipe that is easy to fit in permanent or temporary manner in an installation for distributing potable water.
OBJECTS AND SUMMARY OF THE INVENTION
To this end, the invention provides a flexible hose of multilayer plastics material, comprising from the inside towards the outside:
an inner layer of a polyolefin that is inert relative to water;
a bonding layer having adhesive properties relative to the polyolefin and to the flexible polyvinyl chloride;
a layer of flexible polyvinyl chloride; and
tubular reinforcement in contact with the polyvinyl chloride.
A hose made in this way presents a structure that makes it suitable for transporting potable water, has flexibility that makes the hose easy to fit, and possessing relatively good mechanical qualities, in particular concerning bursting strength, given the pressure that is usually to be found in the circuits for which the hose is intended, and strength against external forces.
Furthermore, it has been found that this hose presents good resistance to solvents, in particular at temperatures of less than about 40° C.
Furthermore, this hose also presents the property of withstanding strong acids and bases at temperatures of less than 40° C.
In a particular embodiment, the thicknesses of the layers lie in the following ranges:
0.1 mm to 1 mm approximately for the inner layer;
0.1 mm to 0.3 mm approximately for the bonding layer; and
0.5 mm to 4 mm approximately for the layer of polyvinyl chloride.
This structure represents a good compromise between flexibility and mechanical strength.
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Leray Fabrice
Maitay Frédéric
Hook James
Tricoflex SA
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