FR2560343A3 - Flexible pipe tube made from synthetic material - Google Patents

Abstract

The tube according to the invention comprises an inner tube 11 made from polybutylene, a jacket 12 made from aluminium sheet composed of aluminium strips and gripped tightly between two polyethylene layers 13. A braid 14 of intersecting polyester-fibre tapes is stretched around the jacket and joined to the latter by means of the outer layer 13; the tapes 14 form a openwork (mesh) structure including intestices 15. Finally, the tube is covered with an outer jacket 16 made from polypropylene. Application to pipework for under-floor heating and for hot and cold water.

Description

 The invention relates to a plastic pipe for use which can be used both for underfloor heating and for cold and hot water pipes.

 There are already known flexible plastic pipe tubes intended for the uses mentioned above and comprising an inner tube of polypropylene or else of braided polyethylene and an outer envelope of polypropylene. These types of tubes have the drawback of not being able to be installed or even bent easily and for this purpose having to be heated most of the time. In addition, these tubes do not have sufficient stability to aging and are not sufficiently tight against the diffusion of oxygen. On the other hand, their resistance to pressure is limited.

 The object of the present invention is to create, for future uses, a flexible plastic pipe which can be easily installed cold and in particular that it can be bent to a small radius of curvature, which is impermeable to the diffusion of oxygen, which can withstand greater pressures and which, in the end is very stable to aging and thus guaranteed against damage.

To carry out this task, it is proposed according to the invention, to produce a pipe tube which has the following structure 1 - an inner polybutylene tube of internal diameter
laughing ranging from about 10 mm to about 18 mm and a
thickness ranging from about 2 mm to about 3 mm; 2 - an envelope surrounding and adhering to the inner tube
rant strongly, composed of strips of aluminum foil
minium garnished on both sides with a layer of
polyethylene -and whose edges overlap and are
welded to each other; 3 - a mesh of openwork polyester fiber ribbons,
with interstices, strongly stretched over
the aluminum foil envelope and adhering to it
strongly; 4 - an outer polypropylene envelope, of a
thickness ranging from approximately 0.5 mm to approximately 1 mm,
covering the mesh with ribbons of fibers and pumice
the aluminum foil casing and
closely related to them.

In the drawing is shown a section of the pipe tube according to the present invention, which is produced as follows
The inner tube 11 is made of polybutylene. Its thickness is from about 2 mm to about 3 mm, depending on the inside diameter, which, as a rule, is from about 10 mm to about 18 mm and more.

 The inner tube is covered with an envelope of aluminum foil 12, which is composed of strips of aluminum foil and is sandwiched between two layers of polyethylene 13. The edges of these strips of sheet overlap and are welded together. to others.

The aluminum foil envelope adheres to the inner tube # 11 by means of the polyethylene layer and is therefore tightly and tightly bonded therewith.

 A lattice of intertwined polyester fiber ribbons 14 is tightly stretched around the aluminum foil wrap mentioned above, and is tightly bonded with it by means of the outer polyethylene layer 13 of said foil wrap aluminum. The fiber ribbons 14 form an openwork structure comprising interstices 15.

 Finally, the pipe tube thus produced is covered with an outer casing 1.6 of polypropylene whose thickness varies from approximately 0.5 mm to approximately 1 mm and possibly a little more. This outer envelope 16 is closely linked with the lattice of fiber ribbons 14 and occasionally with the outer layer of polyethylene 13.

 A pipe tube produced in this way has all the qualities required to ensure long-term security and easy installation.

Claims (1)

CLAIMS and of a thickness ranging from approximately 2 mm to an interior approximately ranging from approximately 10 mm to approximately 18 mm Piping tube made of synthetic material for underfloor heating as well as for piping cold water and hot water, characterized by the following structure 1 - an inner tube (11) of polybutylene with a diameter ranging from approximately 0.5 mm to approximately and strongly adhering thereto; 4 - an outer polypropylene envelope (16), stretched over the envelope (12) of perforated aluminum sheet, having interstices (15) strongly overlap and are welded to each other; 3 - a lattice (14) of polyester fiber ribbons polyethylene layer (13) and the edges of which are aluminum foil lined on both sides by one and strongly adhering thereto, composed of 3 mm strips; 2 - an envelope (12) surrounding the inner tube (11)  1 mm, covering the mesh with fiber ribbons (14)  and punctually the aluminum foil envelope  and closely related to them.