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Glass wool carpets constant thickness,
bulk density increased, the low frequency sound absorption coefficient
has
increased; but when the density increased to a certain extent, the
material becomes dense, the flow resistance is greater
than the optimum flow resistance, sound absorption coefficient
decreased. For thicker than 5cm in bulk density centrifugal
glass wool 16Kg / m3, the low frequency 125Hz is about 0.2, the
high-frequency (> 500Hz) of the absorption coefficient is
close to 1. When the thickness continues to increase by the 5cm, the
low-frequency sound absorption coefficient gradually
increased, when the thickness is greater than 1m or more, 125Hz low
frequency sound absorption coefficient will also be
close to 1. When the same thickness, bulk density increases, the low
frequency sound absorption coefficient centrifugal
glass wool will continue to increase, when the bulk density approaching
110kg / m3 when maximum sound absorption
performance, 50mm thick, the frequency of 125Hz at close to 0.6-0.7.
When the bulk density exceeds 120kg / m3, the sound
absorption performance declines and because the material becomes dense,
high-frequency sound absorption performance is
greatly affected when the bulk density of more than 300kg / m3, the
sound absorption performance decreases a lot. Commonly
used in architectural acoustics acoustic glass wool thickness are 2.5cm,
5cm, 10cm, bulk density have
16,24,32,48,80,96,112kg / m3. Usually 5cm thick centrifugal glass wool
12-48kg / m3 of.
Centrifugal glass wool felt sound absorption performance and
installation conditions also have a close relationship. When
behind glass wool board air layer, similar to the same thickness of the
air layer without glass wool sound absorption
effect. Especially in the low-frequency sound absorption performance
than the real material posted on the hard ground
surface is significantly increased, the absorption coefficient increases
with increasing thickness of the air layer, but
to a certain value of the effect is not obvious.
Glass wool felt
Glass wool carpets using different density glass wool and laminated
together to form the bulk density increases in the
form of greater absorption effect can be obtained. For example, a layer
of 2.5cm thick 24kg / m3 board with a layer of
cotton 2.5cm thick 32kg / m3 cotton board sound absorption stacked
together and better than 5cm thick layer of 32kg / m3
cotton board. The 24kg / m3 glass wool plate made 1m long section of
triangular wedge, the material surface density
increases, the average absorption coefficient close to 1. Centrifugal
glass wool is a unique technique, the molten glass
to be fibrillated and a thermosetting resin-based binder formulation
environmentally friendly processing of the article,
is a only a few microns in diameter made from glass fibers are formed
flexible glass fiber products, and can choose
according to different requirements of composite veneer moisture online.
because of its large number of tiny air gap,
making it play a thermal insulation, sound absorption and safety
protection and so on, is building thermal insulation,
sound absorption of the best materials. Unique technology unique
advantages, after compression packing rebound rate was
99.2%. Soft elongated fiberglass minimization of catkins construction.
Wool carpets
Rock wool board is suitable for all kinds of pipe insulation and heat
insulation, especially convenient for small mouth
straight pipeline construction rapidly. Rock wool board with special
features moisture, exhaust temperature, hydrophobic.
In the humid environment, moisture absorption rate of 5%, 98% or more
hydrophobic. Rock wool board having a high
temperature corrosion effect, rock wool strip contains fire board is the
use of siliceous material or calcareous materials
as the main raw material, lightweight aggregate, adhesives and additives
are mixed with a certain proportion of chemical
fiber materials, autoclave technology made decorative plates. Rock wool
board is a new material is currently used in more
and more, not only because of its use of fire safety factors.
Construction of rock wool board for pasting glue is
relatively high, the price of good quality fire board should be more
expensive than the decorative panels. Rock wool board
thickness is generally 30mm, 40mm and 50mm 60mm-120mm.
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