Weather resistant panels

E - Fixed Constructions – 06 – B

Patent

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Details

E06B 3/70 (2006.01) B32B 5/20 (2006.01)

Patent

CA 2318510

The use is described of rigid foam cores in panels, especially doors, of the kind comprising a foam core (22) between two moulded skins (8, 10). The weather-resistance, especially the resistance to thermally-induced bowing, of such panels is improved by forming the panel of at least one vacuum-formed thermoplastics skin (8, 10) adhesively bonded to a substantially open-cell, rigid foam core (22). If the foam has frangible cell walls, it can be conformed to accommodate the depressed zones of a moulded overlying door skin (8, 10) by crumbling under compression, with fracture of the cell walls to accommodate the zones. A preferred open-cell rigid foam is a phenolic foam reinforced with finely divided particulate filler.

L'invention concerne l'utilisation d'âmes en mousse rigide dans des panneaux, notamment des portes, du genre comprenant une âme cellulaire (22) prise entre deux peaux moulées (8, 10). La résistance aux intempéries, notamment la résistance au gauchissement d'origine thermique, de ces panneaux est améliorée grâce au fait que ceux-ci sont constitués d'au moins une peau (8, 10) thermoplastique formée sous vide et adhérisée à une âme (22) en mousse rigide à alvéoles sensiblement ouvertes. Si la mousse présente des parois d'alvéole frangibles, elle peut être conformée pour compenser les zones affaissées d'une peau moulée (8, 10) supérieure de porte, par effritement sous compression, assorti d'une rupture des parois d'alvéole pour compenser ces zones. Une mousse rigide cellulaire préférée est une mousse phénolique renforcée avec des charges particulaires finement divisées.

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