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Acoustic Nonwovens

  
Overview

    Tongsheng acoustic nonwoven is a new type of super thin light sound-absorbing material,be made of various functional fibers. Sound absorption is a sound dissipation and can be achieved by means of very thin absorbers presenting an appropriate sound impedance. For sound absorption, the propagation of sounds is absorbed by converting sound energy into thermal energy. Materials with sound-absorbing properties are called sound-absorbing materials. Tongsheng acoustic nonwoven is a porous sound-absorbing material, there is many connected micro-holes inside the material. On porous sound-absorbing materials, sound energy is mainly converted into thermal energy by viscous friction between the oscillating particles of the sound-propagating medium (air) and the structure of the porous material.
       Tongsheng acoustic nonwoven is the new material specially designed for absorbing sounds. In practice, perforated ceiling tiles made of metal, wood, plastic or gypsum and provided with Tongsheng acoustic nonwovens(glued) on the back are used for absorption of air-borne noises.
Property 、Technical data & Application

        Tongsheng acoustic nonwovens are available for the thickness of 0.2mm and 0.35mm, in black and white, with or without hot melt glue on the back. Except the sound absorption values, main technical data is given in the table.

Technical Property Unit Technical Data Test Instrument
Nonwoven weight
(with glue)		 g/㎡ 63±5(0.2mm) TG328B Analyzed Balance
80±5(0.35mm)
Nonwoven thickness
(without glue)		 mm 0.22±0.05 ZH-4 Thickness Meter
0.35±0.05
Nonwoven thickness
(with glue)		 mm 0.27±0.05 ZH-4 Thickness Meter
0.40±0.05
Tensile strength N/50mm 30 ASC-J Tensile Strength Tester
Hot melt temperature range ℃ 115-125 Hot Melt Temperature Tester
Max. roll width mm 850
Storage conditions &
storage duration		 Storage under cool, dry and light-protected conditions is recommended (storge temperature max. 40℃, avoidance of high relative air humidity, formation of condensed water and solar radiation). Be sure to place them upright and don't exert pressure. Storge duration until processing should not exceed 8 months.
Color
 
 
Besides black and white, almost all RAL colors in common use can be provided.

All numbers represent average values which are subjected to normal production tolerances.

Technical data
Download (PDF File, 82KB)

 

Tongsheng sound-absorbing nonwovens provided with a hot-melt finish. Various techniques can be used:

1.Infrared-radiation
    Activate the hot-melt finish with an infrared radiator and press by using a brush roll
2.Hot air-fan
    Activate the hot-melt finish with a hot air-fan and bond by using a feed roll
3.Flat-iron
    Lay the hot-melt side onto the ceiling system and laminate it by using a flat-iron within a temperature range of 115 -125°C

Test of Sound Absorption Coefficient

        Tongsheng acoustic nonwovens were tested by Acoustics Institute of Tongji University, the result is given in the table.

 

Acoustics Institute of Tongji University

Test report of measuring the sound absorption coefficient in the Reverberation Chamber

 

testreport1-2

Basis ：The national standard GBJ 47-83
             Reverberation chamber measurement of absorption
             coefficient norms

Reverberation chamber ：Cubage ：268 ㎡ . Area ：54 ㎡.

Instrument ：Danish BK4417 Architectural Acoustics Analyzer
 　　　　　　　　　BK4166 Sensor
　　　　　　　　　 American KNG Power Amplifier
 　　　　　　　　　Special speaker for testing

Area ：3.0 m×3.6 m =10.8 ㎡

Frequency Range ：1/3 octave center frequency (Hz)
　　　　　　　　　　　　　100 、 125 、 160 、 200 、 250 、 315 、 400 、
　　　　　　　　　　　　　500 、 630 、 800 、 1000 、 1250 、 1600 、
　　　　　　　　　　　　　2000 、 2500 、 3150 、 4000 、 5000

 
images Download (PDF File, 455KB)

Test Project of Tongsheng acoustic nonwovens:

  Size Area Installation condition Noise reduction coefficient
(NRC)
1 perforated aluminium plate: 600mm×600mm. hole diameter: Φ2.4mm. hole area proportion :16％. thickness: 0.2mm. unit weight: 66g/㎡ 3.0m×3.6m=10.8㎡ cavity 100mm 0.75
2 as above as above cavity 200mm 0.8
3 as above as above cavity 400mm 0.55

 
Test of Flame Retardant

    　　Tongsheng acoustic nonwovens were tested by China National Center for Quality Supervision, Inspection and Fire, the result is given in the table. The tests were passed and the result was non-flammable to GB 8624-1997. It can be classified in Class B1.

 

China National Center for Quality Supervision, Inspection and Fire

Test report of Tongsheng acoustic nonwovens Flame Retardant
 

testreport2-2

Basis ：The national standard GB/T 5455-1997
             Textile Vertical combustion test method

Project ：Vertical combustion test method

Number of samples ： 10

 
images Download (PDF File, 421KB)
Test Project of Tongsheng acoustic nonwovens:
Test Status Project Result
warp-wise across warp
average time for continued burning (s) 0 0
average time for smoldering (s) 0 0
length of the average damage (mm) 72 78
Combustion characteristics: carbonization.
 
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