Process for preparing a mineral fibre element comprising a surface coating
AssigneeRockwool International A/S
InventorsMartin Vendelbo Gundberg, Claus Bugge Garn
Life of this patent
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Abstract
A method of producing a mineral fibre element comprising a mineral fibre base layer having a surface coating in the form of a fibrous netting formed of a thermoplastic polymer material wherein such a surface coating is provided on at least a part of the surface of the base layer, wherein the surface coating is formed directly on the surface of the base layer and wherein the surface coating is formed by heating a thermoplastic polymer material so as to melt it and distributing the polymer melt obtained in the form of fibres and/or filaments on the surface of the base layer and cooling it to form a solid layer.
Claims16
A method of providing a fibrous thermoplastic netting layer adhered around all surfaces of a mineral fibre base layer and thereby producing a mineral fibre element for use as insulation, said method comprising the steps of
- (a) providing the mineral fibre base layer consisting essentially of mineral fibres wherein the layer has surfaces consisting of an upper side, a lower side and side edges,
- (b) providing a melt of thermoplastic polymeric material,
- (c) discharging the melt of thermoplastic material through nozzles towards said surfaces of the mineral fibre base layer,
- (d) collecting and cooling the thermoplastic material on each of said surfaces in the form of filaments or fibres or both and thereby forming the fibrous netting layer adhering to each of surfaces of the mineral fibre base layer,
- wherein the weight of the fibrous netting layer is from 2 to 50 g/m2 and the adherence of the netting to the mineral fibre base layer consists essentially only of the adhesion of thermoplastic of the netting layer to the mineral fibres of the mineral fibre base layer.
A method of providing fibrous thermoplastic netting layer adhered to a surface of a mineral fibre base layer and thereby producing a mineral fibre element for use as insulation, said method comprising the steps of
- (a) providing the mineral fibre base layer consisting essentially of mineral fibres wherein the layer has surfaces consisting of an upper side, a lower side and side edges,
- (b) providing a melt of thermoplastic polymeric materials,
- (c) discharging the melt of thermoplastic material through nozzles towards at least the upper side surface of the mineral fibre base layer,
- (d) collecting and cooling the thermoplastic material on said surface in the form of filaments or fibres or both and thereby forming the fibrous netting layer adhering to said surface of the mineral fibre base layer,
- wherein the weight of the fibrous netting layer is 2 to 50 g/m2 and the adherence of the netting to the mineral fibre base layer consists essentially only of the adhesion of thermoplastic of the netting layer to the mineral fibres of the mineral fibre base layer, and
- wherein either (a) the melt is extruded through the said nozzles towards the said surfaces and extruded melt is elongated by high pressure gas streams which are directed close to the nozzles or (b) the melt is mixed with gas and discharged from the nozzles as a spray to form a netting of partially foamed strings.
Dependencies are inferred from the claim text.