FLEXIBLE HOSE FOR CHIMNEY LINING.

Abstract

Ce tuyau flexible est du type constitué en un feuillard en alliage d'aluminium, dont au moins la face destinée à former la paroi intérieure du tuyau est revêtue d'une couche de matière insensible aux fumées, telle qu'un époxy-phénol. Chaque couche protectrice en matière insensible à l'humidité et aux fumées, est recouverte d'une seconde couche, beaucoup plus souple, et présentant de bonnes qualités d'accrochage à la première couche.

Description

1 - "FLEXIBLE HOSE FOR CHIMNEY LINING" The present invention relates to an improvement to the flexible pipes for chimney linings described and claimed in the main patent, which are generally made of aluminum alloy strip. or stainless steel. The main patent aims to improve the lifespan of chimney liners to reduce the frequency of replacements and, consequently, lower the maintenance costs of chimneys equipped with such liners, even when used for highly corrosive fumes such as those emitted by condensing appliances. To this end, at least the face intended to form the inner wall of the pipe is coated with a layer of fume-resistant material, such as an epoxy-phenol. In such a liner, the aluminum alloy strip acts as a mechanical support inserted into the chimney, and the layer of fume-resistant material protects the strip against corrosion. eliminating all contact between him and the fumes. However, in practice, the brittle nature of the protective coating material, particularly when made of epoxy-phenol resin, proved to cause damage either during the installation of the casing or other handling operations, or subsequently, as a result of, in particular, thermal shocks, cracks negating the desired protective effect. To remedy this, according to the present invention, each protective layer made of a material insensitive to moisture and fumes is covered with a second layer, much more plastic, and exhibiting good adhesion qualities of the first coat. The presence of this second layer, thanks to its flexibility, allows for a balance between corrosion resistance and mechanical protection. of the metal strip, through a self-healing effect. In the case where the first layer is made of an epoxyphenol resin, the second layer is advantageously made of a polyamide varnish, such as a polyurethane. Advantageously, this double protection, through two superimposed layers of a fume-resistant coating, such as an epoxy-phenol resin, and a more flexible coating, such as a polyamide like polyurethane, is applied to both the inner and outer faces of the pipe. flexible.

Claims

DEMANDS 1 flexible pipe for chimney lining, according to one of the claims of the main patent, characterized in that Each protective layer, made of a material insensitive to moisture and fumes, is covered with a second, much more flexible layer with good adhesion qualities. the first layer. 2 Flexible hose, according to claim 1 or claim 1- cation 2, characterized in that, when the first layer is made of an epoxy-phenol resin, the second layer is made up of a polyamide varnish, such as a polyurethane. 3 Flexible hose, according to claim 1 or claim 1- cation 2, characterized in that the double protection, by two superimposed layers, of a coating insensitive to fumes such as an epoxy-phenol resin and a more durable coating ple, such as a polyamide, a polyurethane, is applied on both sides, internal and external, of the flexible hose.