Abstract: Acoustic element (1) has a flat, sound-receiving, front face (2) 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/m3 wherein the fibres extend from the front face (2) 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.

Abstract: Acoustic element (1) has a flat, sound-receiving, front face (2) 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/m3 wherein the fibres extend from the front face (2) 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.

Abstract: A multispectral three-dimensional camouflage mat has a base or substrate layer into which are woven strands of yarn of varying length and color to simulate terrain or landscape, or alternatively to serve as a decoy by simulating a target. Desired reflection and absorption of visible light as well as infrared, ultraviolet, and microwave frequencies is provided by materials integrally contained within the yarn strands, and by supplemental materials on the base layer. An alternative embodiment is a light-penetrable camouflage screen which also uses the concept of integral incorporation of reflecting and absorbing additives for nonvisual wavelengths in plastic material forming the body of the screen.

Abstract: A multispectral three-dimensional camouflage mat has a base or substrate layer into which are woven strands of yarn of varying length and color to simulate terrain or landscape, or alternatively to serve as a decoy by simulating a target. Desired reflection and absorption of visible light as well as infrared, ultraviolet, and microwave frequencies is provided by materials integrally contained within the yarn strands, and by supplemental materials on the base layer.