Method and device for producing a mineral wool nonwoven fabric
AssigneePfleiderer Dämmstofftechnik International GmbH & Co.
InventorsWilfried Naber, Ludwig Schorr
Life of this patent
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Abstract
A device for producing a mineral wool nonwoven fabric, comprising a drop shaft and fibrillation devices in addition to a conveyor device for the conveyance of mineral wool nonwoven fabric. A device is also provided to separate the strip of insulating material into a first section and a second section in a longitudinal direction. A conveyor device directs the first section in such a way that it is placed on the second section. The device enables a mineral fiber product to be created with a density distribution that is such that the upper area and the lower area have a higher density than the area located inbetween.
Claims15
An apparatus for producing a mineral wool nonwoven fabric (52) including
- a shroud (10) comprising
- at least one fiberizing means (26a, 26b);
- and
- a conveyor means (16) for transporting the produced primary nonwoven (24), said conveyor means being capable of guiding a first blanket section (38) so that said first blanket section (38) is deposited on a second blanket section (40);
- the conveying distance of said first blanket section (38) being unequal to the conveying distance of said second blanket section 40),
- characterized in that
- said shroud (10) is double wide;
- a slitter (34) is provided for slitting said produced mineral wool nonwoven fabric into said first blanket section (38) and said second blanket section (40);
- and
- said conveyor means (46, 48, 58) comprises for inverting said first blanket section (38) an inverting pulley (46) about which said first blanket section (38) is guidable, said first blanket section (38) being inverted so that the underside of said first blanket section (38) is located upwards;
- and
- each of said at least one fiberizing means (26a, 26b) produces a mineral wool nonwoven fabric (24) forming two layers in said secondary nonwoven (52).
A method of producing mineral wool nonwoven fabric (52) comprising the steps:
- fiberizing the raw material in at least one fiberizing means (26a, 26b);
- depositing the fibers on a collection conveyor (16) of a shroud (10) for forming a primary nonwoven (24);
- slitting said primary nonwoven so that a first blanket section (38) and a second blanket section (40) materialize;
- transporting said first blanket section (38) and said second blanket section (40) such that the conveying distances between shroud and curing oven are longitudinally staggered;
- inverting said first blanket section (38) so that the underside of said first blanket section (38) is located upwards;
- depositing said first blanket section (38) on said second blanket section (40) to form a secondary nonwoven (52).
A mineral wool blanket or mineral wool mat of cross-linked mineral wool fibers including a density distribution across the thickness, the upper portion (24b) and the lower portion (24b) of said mineral wool blanket or mineral wool mat each exhibiting a density higher than that of the portion (56) located between said upper portion and said lower portion, characterized in that two layers in each case comprise identical properties as regards fiber quality and/or binder content;
- and said layers comprise identical density gradients.
A mineral wool blanket or mineral wool mat of cross-linked mineral wool fibers including a density distribution across the thickness, the upper portion (24b) and the lower portion (24b) of said mineral wool blanket or mineral wool mat each exhibiting a density higher than that of the portion (56) located between said upper portion and said lower portion, characterized in that the average density is in the range 4-11 kg/m3, preferably 4-9 kg/m3, most preferably 4-6 kg/m3.
Dependencies are inferred from the claim text.