Noise affects our work efficiency, sleep, hearing and health all the time. To stay away from noise, all we can do is sound insulation and silence. So what materials have sound insulation and sound absorption properties? The "noise killer" you don't know, this edition will introduce some new types of sound insulation and sound absorption materials to everyone, let's understand together.
" Noise killer" material mechanism
Acoustic materials can be divided into sound absorbing materials and sound insulation materials according to their different functions. The sound absorption is mainly to solve the noisy feeling caused by the reflection of the sound. The sound absorption material can attenuate the reflected energy of the incident sound source, so as to achieve the fidelity effect on the original sound source. Sound insulation mainly solves the transmission of sound and makes the main body feel noisy in the space. The sound insulation cotton material can attenuate the transmission energy of the incident sound source, so as to achieve the quiet state of the main body space.
The sound absorption characteristics of ordinary porous sound-absorbing materials are that the sound absorption coefficient gradually increases with increasing frequency, which means that low-frequency absorption is not as good as high-frequency absorption. The necessary condition for the sound absorption of porous materials is: the material has a large number of voids, the voids are interconnected, and the pores penetrate into the material. One of the misconceptions is that materials with rough surfaces have sound-absorbing properties, but they are not. For example, roughened cement and stones with uneven surfaces basically have no sound-absorbing ability. The second misconception is that materials with a large number of holes in the material, such as polyphenylene, polyethylene, closed-cell polyurethane, etc., have good sound absorption performance. In fact, these materials have no connectivity, and the sound waves cannot penetrate deep. Vibration and friction inside the material, so the sound absorption coefficient is very small.
Gradient sound absorbing cotton
Gradient sound absorbing cotton originated from the United States, is a new product developed to replace harmful sound absorbing materials such as glass fiber, rock wool, sponge, etc., is made of 100% polyester fiber, and is made of cocoon cotton after hot pressing .Using the public heat treatment method to achieve density diversification, making it an excellent product among sound absorbing materials, decorative materials, and sound insulation materials.
It contains no glue, so there are almost no volatiles. It consists of two polyester fibers with different melting points. Its environmental protection performance is its biggest advantage. The test data has reached the national E1 level. The evaluation is that it can directly contact the human body. It is the most efficient natural sound absorption and sound insulation material that is closest to nature and harmless to the environment. Its fire resistance is B1 grade, which is a flame-retardant product. Its sound absorption performance has been recognized by the majority of acoustic experts. Environmentally friendly sound-absorbing cotton is used in Europe and the United States. It is used in public places such as piano rooms, machine rooms, conference rooms, gymnasiums, concert halls, recording studios, and highway soundproof walls. It completely replaces harmful sound-absorbing materials such as glass fiber and rock wool sponge.
Product characteristics of gradient sound absorbing cotton
1. The sound absorption efficiency is high. The gradient sound absorption cotton is a porous material with laminated step density, which can absorb noise of various frequencies at the same time. It is tested at the Institute of Acoustics of Tongji University. The test result of the 5cm thick product is NRC (comprehensive noise reduction) Coefficient): 0.90, if the density and thickness are increased, there is still much room for improving its performance;
2. Good sound insulation performance, usually 5cm thick sound insulation cotton can meet the sound insulation requirements of ordinary occasions;
3.Flame retardancy: Panhoo gradient sound insulation cotton is tested in the National Fire Equipment Quality Inspection Center to reach the building material combustion performance level B1.
4. It has excellent environmental protection performance. It has been tested at the National Building Materials Testing Center and reached E1 level. The evaluation is directly in contact with human skin.
5. The structure is compact and the form is stable;
6. Light unit weight, safe and convenient construction;
7. The product does not contain formaldehyde and is harmless to the human body. It does not add any glue during the molding process. It is molded using fibers with different melting points. After experiments and practice, it has no allergy to human skin, no pollution to the environment, and no smell ;
8. Good waterproof performance, strong drainage after water immersion, sound absorption performance does not decline, the shape remains unchanged.
9. Can be used twice, easy to destroy, no secondary pollution to the environment.
Use effect of gradient sound-absorbing cotton
1. Ordinary lightweight soundproof wall
2. Strengthen lightweight soundproof wall
3. Ground sound insulation treatment
High resistance sound insulation felt
The high-barrier sound felt is from South Korea and is an ideal sound insulation material. It is compounded by polymer materials, metal powder and various additives. The sound insulation felt material is light, ultra-thin, soft, and has high tensile strength. The white fleece finish has good sound insulation performance. It should not be broken and softened under the conditions of high temperature and low temperature. The performance of the sound insulation felt can always maintain the same sound insulation performance. The use of sound insulation felt alone is better than traditional sound insulation materials, especially for noises of different frequencies. The sound insulation performance of sound insulation felts combined with other sound absorbing materials will be more excellent, especially with single boards that are prone to vibration (such as Gypsum board, metal veneer, joinery board) can be used in combination to effectively increase the sound insulation of the veneer. In the field of acoustic engineering, it is widely used and has been affirmed and praised by many well-known acoustic experts, and is well received by acoustic designers from various circles The trust and selection have become the material of choice for construction acoustics, industrial noise reduction, product noise reduction and other projects in most cities. The products are widely used for sound insulation in public places such as concert halls, theaters, recording studios, studios, listening rooms, conference rooms, gymnasiums, exhibition halls, dance halls, KTV rooms, machine rooms, equipment noise reduction, and noise barriers.
Product characteristics of high resistance sound insulation felt
1. The material is light, ultra-thin, soft, and has high tensile strength; convenient construction and low cost; flame retardant, moisture-proof, and moth-proof; the most important characteristics are environmental protection of the material, large internal damping, strong sound insulation performance, and Vibration effect is a kind of damping sound insulation material.
2. Impact sound isolation: PANHOO high-barrier acoustic felt is not easy to generate vibration due to its large surface density, and can also prevent its attachments from generating vibration, which can effectively prevent and maximize the isolation of object impact, mechanical equipment vibration, Noise generated by sanitary equipment and pipeline walls.
3. Improve indoor comfort, because the high-barrier sound felt has a good sound insulation effect, preventing external sound from entering the room, thereby changing the indoor living environment.
4. The product is moisture-proof, waterproof and mildew-proof, and is suitable for various humid environments.
5. The construction is simple, easy to install, easy to cut, and can be cut into various sizes according to needs, no special tools are needed during installation. It can be cut with a utility knife and pasted on the surface of steel plate, gypsum board, wood board and other materials.
Sound-absorbing panels
The sound-absorbing decorative art board originated from South Korea and is an ideal sound-absorbing decorative material. The raw material is 100% polyester fiber, which has the characteristics of environmental protection, flame retardant, thermal insulation, moisture proof, mildew proof, easy to remove dust, easy to cut, can be mosaic, simple construction, excellent cost performance, etc. There are a variety of patterns and colors to choose from, It can meet the decoration requirements of different styles and levels. The thickness of the sound-absorbing board is 9mm, and the density is 2.25kg / m2. In the field of decorative materials and acoustic engineering, it is widely used and has been recognized and praised by many famous acoustic experts. It has been trusted and selected by interior designers and acoustic designers from all walks of life. It has become the architectural acoustics and industrial noise reduction of most cities. , Product noise reduction and other engineering materials are preferred. The products are widely used in the grounds, walls and ceilings of public places such as concert halls, movie theaters, recording studios, studios, monitoring rooms, conference rooms, gymnasiums, exhibition halls, dance halls, KTV private rooms and so on. It can well absorb noise and prevent the strong reflection of indoor sound to affect the indoor environment. Allows you to get good sound quality when meeting, listening to reports or listening to music. The sound-absorbing decorative art board developed and produced by modern technology provides an effective way to improve the indoor sound quality.
Sound absorption board product characteristics
1. Sound absorption: 100% polyester fiber is hot pressed at high temperature and made in the shape of cocoon cotton. It adopts high-tech heat treatment to achieve material porosity, becoming an excellent product in sound-absorbing materials, with the highest noise in the 125-4000Hz noise range The sound absorption coefficient reaches more than 0.9, shorten and adjust the reverberation time according to different needs, remove sound impurities, improve the sound effect, and improve the clarity of language. Not only suitable for highly specialized performing arts, audio-visual equipment test rooms, but also widely used in theaters, conference rooms, indoor gymnasiums, concert halls, classrooms, KTV, hotels, offices, home music rooms and other places with high acoustic requirements .
2. Decoration: traditional soft-pack-like suppleness, rich natural material texture experience, a variety of modern colors to choose from, and a simple combination of decorative shapes to achieve modern sound-absorbing decorative art, which can create comfort, tranquility, modernity, Warm yet elegant indoor environment.
3. Environmental protection: the material is non-toxic, no harmful substances are generated and volatilized, and no harm to the human body. Tested by the National Building Materials Testing Center, the product complies with the E1 level specified in the national mandatory standard GB18580-2001. Both belong to the decorative materials that can be used indoors, see the qualification certificate for details. The product can be recycled for the second time, without causing waste pollution to the environment.
4. Ease of processing: The width of the board is large, and it should be cut and cut. This product has good machinability, and can be easily reflected by ordinary utility knives for random cutting, diverse color matching, simple splicing, simple processing of corners, perfect artistic drawings and different styles. It can be directly pasted and fixed with a nail gun. It can be firmly attached to the wall or the cavity is attached to the keel after design. The construction and installation are simple and fast.
5. Stability: Will not expand or shrink due to changes in temperature and humidity. Let the perfect decoration effect leave no trace of repair from beginning to end.
6. Impact resistance: supple, natural texture, high elasticity, and will never break under the impact of huge external force, can withstand any impact in the stadium and various sports venues. It is safe and reliable to use, even if the damage is only partial, it will not produce debris and will hurt people or objects. It is more suitable for sound-absorbing decoration in public places and public buildings.
7. Maintenance simplicity: It is easy to remove dust and easy to maintain. Dust and impurities can be flicked with a vacuum cleaner and a duster. Dirty areas can also be wiped with towels and water and detergent.
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