Main features:
The physical performance of random cutting is stable, and the sound absorption performance is introduced in detail. The main characteristics of internal structure are briefly introduced, and the physical properties of random cutting are stable. The sound absorption performance is introduced in detail.
Introduction:
Glass wool felt Glass wool is an elastic felt made of glass fibers with a diameter of only a few microns. It is made of centrifugal glass wool felt. It is made by using the centrifugal technology patented by Owens Corning Company (OC for short) to fibrillate molten glass and adding thermosetting resin as the main environmental protection formula binder. Different moisture-proof veneers can be selected for on-line compounding according to the use requirements. It has a large number of tiny pores, which make it play the role of heat preservation, sound absorption and noise reduction and safety protection. It is the best material for thermal insulation, sound absorption and noise reduction of steel structure buildings.
Glass wool belongs to a category of glass fiber and is an artificial inorganic fiber. Natural minerals such as quartz sand, limestone and dolomite are used as the main raw materials, supplemented by some chemical raw materials such as soda ash and borax. In the molten state, it is spun into flocculent fine fibers by means of external blowing system, and the fibers are intertwined with each other in a three-dimensional way, showing many fine gaps. This gap can be regarded as a pore. Therefore, glass wool can be regarded as a porous material with good heat insulation and sound absorption properties.
The internal structure of this section has been edited. The fibers in centrifugal glass wool are fluffy and staggered, with a large number of tiny pores. It is a typical porous sound absorption material with good sound absorption characteristics. Centrifugal glass wool can be made into wallboard, ceiling and space sound absorber. , can absorb a lot of indoor acoustic energy, reduce reverberation time and indoor noise.
The sound absorption characteristics of centrifugal glass wool, the main feature of this section, are related to the covering material, structure and other factors besides the thickness and packing density. In the application of architecture, it is necessary to take into account many problems such as cost, beauty, fire prevention, moisture prevention, dust prevention and aging resistance.
Cut at will to prevent bacteria, mold, aging and corrosion, and ensure a healthy environment.
Can be cut and shaped at will.
The physical properties are stable. It has passed ANZ AS/NSZ4859. 1, SGS certification, MSDS certification, EU CE certification, CE fire rating certification and national standard GB/T 13350-2000. The scope of application is suitable for thermal insulation, sound absorption and noise reduction of industrial workshops, warehouses, public facilities, exhibition centers, shopping malls, and various indoor playgrounds, sports venues and other buildings.
Edit this paragraph to introduce in detail that the glass wool tube centrifugal glass wool is a porous sound-absorbing material with good sound-absorbing performance. Centrifugal glass wool can absorb sound, not because its surface is rough, but because it has a large number of tiny pores and holes which are communicated with the inside and outside. When sound waves are incident on the centrifugal glass wool, they can enter the interior of the material along the pores, causing the vibration of air molecules in the pores. Due to the viscous resistance of air and the friction between air molecules and the hole wall, acoustic energy is converted into heat energy and lost.
Sound absorption centrifugal glass wool has good sound absorption performance for middle and high frequencies. The main factors affecting the sound absorption performance of centrifugal glass wool are thickness, density and airflow resistance. Density is the weight of material per cubic meter. The airflow resistance is the ratio of air pressure and air velocity on both sides of the material per unit thickness. The airflow resistance is the most important factor affecting the sound absorption performance of centrifugal glass wool. The flow resistance is too small, indicating that the material is sparse, air vibration is easy to pass, and the sound absorption performance is reduced; Excessive flow resistance indicates that the material is dense, it is difficult to introduce air vibration, and the sound absorption performance is also reduced. For centrifugal glass wool, the sound absorption performance has the best flow resistance.
In practical engineering, airflow resistance is difficult to measure, but it can be roughly estimated and controlled by thickness and volume density.
1, with the increase of thickness, the sound absorption coefficient of middle and low frequencies increases significantly, but the high frequency changes little (the high frequency absorption is always large).
2. When the thickness is constant, the volume density increases, and the sound absorption coefficient of middle and low frequencies also increases; However, when the bulk density increases to a certain extent, the material becomes dense, the flow resistance is greater than the optimal flow resistance, and the sound absorption coefficient decreases. For centrifugal glass wool with a bulk density of 16Kg/m3 and a thickness of more than 5cm, 125Hz is about 0.2 at low frequency, and >: 500Hz is close to 1. When the thickness increases from 5cm, the sound absorption coefficient of low frequency increases gradually, and when the thickness is greater than 1m, the sound absorption coefficient of low frequency 125Hz will also approach 1. When the thickness is constant and the bulk density increases, the low-frequency sound absorption coefficient of centrifugal glass wool will also increase. When the bulk density is close to 1 10kg/m3, the sound absorption performance reaches the maximum, which is close to 0.6-0.7 at the thickness of 50mm and the frequency of 125Hz. When the bulk density exceeds 1.20kg/m3, the sound absorption performance decreases, because the material becomes dense, which greatly affects the sound absorption performance at middle and high frequencies. When the bulk density exceeds 300kg/m3, the sound absorption performance decreases a lot. The thickness of sound-absorbing glass wool commonly used in architectural acoustics is 2.5cm, 5cm and 10cm, and the bulk density is 16, 24, 32, 48, 80, 96, 1 12kg/m3. Centrifugal glass wool with a thickness of 5cm is usually used, 12-48kg/m3.
The sound absorption performance of centrifugal glass wool is also closely related to the installation conditions. When there is an air layer behind glass wool board, the sound absorption effect is similar to that of glass wool board with the same thickness and no air layer. In particular, the sound absorption performance of middle and low frequencies will be greatly improved than that of materials stuck on hard bottom surface, and the sound absorption coefficient will increase with the increase of air layer thickness, but the effect is not obvious after increasing to a certain value.
Glass wool felt is formed by stacking glass wool with different bulk densities, forming a form of increasing bulk density, which can obtain greater sound absorption effect. For example, a layer of 2.5cm thick cotton board with 24kg/m3 and a layer of 2.5cm thick cotton board with 32kg/m3 will have better sound absorption effect than a layer of 5cm thick cotton board with 32kg/m3. The glass wool board of 24kg/m3 is made into a wedge with a triangular cross section of 1m, and the surface density of the material gradually increases, and the average sound absorption coefficient can approach 1. Glass wool is a product made of molten glass fiber with thermosetting resin as the main binder. It is an elastic glass fiber product made of glass fiber with a diameter of only a few microns, which can be combined with moisture-proof veneer online according to different requirements of customers. Because of its large number of tiny air gaps, it plays the role of heat insulation, sound absorption, noise reduction and safety protection. It is the best material for building heat insulation, sound absorption and mania reduction. Unique advantages and unique technology, the rebound rate after compression packaging is 99.2%. The soft and slender glass fiber minimizes the flying flocs produced in the construction process.
Editing this architectural application centrifugal glass wool is often attached with certain sound-transmitting decorative surfaces, such as plastic film, metal mesh, window screen, fireproof cloth, glass fiber cloth, etc. The original sound absorption characteristics can be basically maintained.
Aluminum foil glass wool centrifugal glass wool has excellent characteristics such as fire prevention, heat preservation and easy cutting, and is one of the most commonly used materials for building sound absorption. However, because the surface of centrifugal glass wool is not decorative, there will be fibers scattered, so it is necessary to make various sound-absorbing parts for hidden use. The most commonly used and lowest cost structure is a ceiling with perforated gypsum board or a perforated wall filled with centrifugal glass wool. When the perforation rate is more than 20%, the sound absorption performance of centrifugal glass wool can be fully exerted. In order to prevent the glass cotton fiber from overflowing, it is necessary to stick a layer of sound-transmitting fabric such as non-woven fabric and mulberry paper on the back of the perforated plate, or wrap the glass cotton with glass cloth and plastic film. Similar to perforated gypsum board, there are perforated metal plate (such as aluminum plate), perforated wood plate, perforated fiber cement plate, perforated mineral wool plate and so on.
Glass wool board can be made into sound-absorbing ceiling or sound-absorbing wallboard after treatment. Generally, a fire-proof and sound-permeable fabric is wrapped around the glass wool board with 80- 120kg/m3, which is cured by glue to form a sound-absorbing wallboard with beautiful appearance and convenient installation. The common sizes are 1.2m× 1.2m, 1.2m×0.6m, 0.6m×0.6m, and the thickness is 2.5cm or 5cm .. And 1 10Kg/m3 glass wool is directly sprayed with sound-transmitting decorative materials. Both glass wool sound-absorbing wallboard and sound-absorbing ceiling board need to use glass wool with high volume density and undergo certain strengthening treatment to prevent the board from being deformed or too soft. This building material not only has good decoration, but also retains the good sound absorption characteristics of centrifugal glass wool, and the noise reduction coefficient NRC can generally reach above 0.85.
In large spaces such as gymnasiums and workshops, centrifugal glass wool is often used as the main sound-absorbing material for sound absorption and noise reduction. The sound absorber can be made into plate, column, cone or other special-shaped bodies as required. The interior of the absorber is filled with centrifugal glass wool, and the surface is covered with a sound-transmitting surface layer. Because the sound absorber has multiple surfaces to absorb sound, the sound absorption efficiency is high.
In the road noise barrier, in order to prevent noise reflection, it is necessary to take sound absorption measures at the side facing the vehicle. Usually, centrifugal glass wool is used as the barrier plate and perforated metal plate is used as the filling material. In order to prevent glass wool from absorbing moisture outdoors, it is sometimes wrapped in PVC or plastic film.