Rockwool International A/s

Lars Bollund

Lars Elmekilde Hansen

Lars Kresten Hansen

Peter Farkas Binderup Hansen

Per Steenbjerg

Haosheng Zhou

Jorgen Birch

Jeroen Petrus Wilhelmus Sap

Gorm Rosenberg Jensen

Peter Farkas Hansen

Leif Moller Jensen

Leif Møller Jensen

Peter Binderup Hansen

The present invention relates to an apparatus and a method of making a mineral melt, the method comprising the steps of providing a circulating combustion chamber (); injecting fuel, preheated mineral material and combustion gas into the circulating combustion chamber (); combusting the fuel in the circulating combustion chamber () thereby melting the mineral material to form a mineral melt and generating exhaust gases; separating the exhaust gases from the mineral melt, collecting the mineral melt () and passing the exhaust gases () to a heat exchange system, the method being characterised in that the mineral material comprises a first mineral material and a second mineral material wherein the first mineral material has a higher sintering temperature than the second mineral material and the first and second mineral materials are provided separately to the heat exchange system, wherein the first mineral material is preheated through contact with the exhaust gases and subsequently the second mineral material is preheated through contact with the exhaust gases and the preheated first mineral material.

Process and apparatus for making a mineral melt

Acoustic element () has a flat, sound-receiving, front face () which extends in the XY plane and has a good sound-absorption coefficient, and the element is formed of a bonded batt of air laid mineral fibres having a density of 70 to 200 kg/mwherein the fibres extend from the front face () and at least through the front half of the thickness of the batt have a Z direction component greater than the Z direction component of conventional air laid products, and the front face of the batt is a cut and abraded face. The element can be made by air laying mineral fibres and binder, reorienting the fibres to provide an increased fibre orientation in the Z direction, curing the binder to form a cured batt and cutting the cured batt in the XY plane into two cut batts and smoothing each cut surface by abrasion to produce a flat face on each cut batt.

Acoustic elements and their production

Growing community of inventors

Slangerup, Denmark

Lars Bollund