one would not have expected that under these conditions the friction between fibers and the sieve drum sheet former would have been intense enough to produce the static electricity this surprising and potentially fatal effect can be overcome or reduced by adding an antistatic agent to the fiber e g by spraying water in with the fiber by adding an antistatic chemical to the fiber or by an appropriate selection of binder after the insulation product is produced in a humid or less static environment excess water can be removed by heating e g when the binder is cured in embodiments the thickness of the fiber layer of the insulation product of the present invention is preferably in a range from 4 to 250 mm more preferably from 10 to 205 mm most preferably from 12 to 76 mm when the insulation product contains the mixed fiber layer the percentage of textile fiber in the product can be in a range of 1 to 99 preferably from 20 to 70 and more preferably from 25 to 50 the higher the percentage of textile fiber the stronger the product however higher percentages of textile fiber lead to a reduction in acoustic and thermal insulation performance with high cost insulation product produced by a state of the art air laid process especially on a doa machine exhibits a consistent surface appearance and smoothness a homogeneous color and more surprisingly a structure of inclined overlaid fiber layers in particular with 100 textile fiber this special oriented structure is beneficial for thickness recovery after long storage of the insulation under compression at thicknesses 25 of the nominal thickness or less fig1 illustrates various embodiments of the invention.