Sound absorption characteristics of rock wool felt

Sound absorption characteristics of rock wool felt

The basic sound absorption characteristics of rock wool felt, the data of the condition of close contact with the rigid wall (no air layer behind), according to the weight of 120 kg / m 3 below and above, it has the sound absorption characteristics of typical porous materials, even It is a similar thickness. If the volume is large, there will be a trend of increasing the sound absorption coefficient in the low frequency range. For the sound absorption coefficient in the low frequency range, the thickness is the key factor of Zui.

There is a great distinction between the arrangement of fibers and the state of manufacture, but it can be inferred that the damage of this type of distinction to the characteristics of sound absorption is very small. I want to study this damage, and to absorb some of the different rock wool products with a thickness of 25 mm. The average of the acoustic traits is very high, and there is no difference in the average between the different products.

It is only when the sound waves are perpendicularly incident on the material step, and the manufacturing state sometimes has a relationship with the sound absorbing characteristics, so this is understood by using conditions.

In fact, glass wool felt is a kind of coil suitable for large-area laying. If you want to know the appearance of the product, then the picture can be searched. The product is widely used in life, and has outstanding effects in the field of construction, transportation, and electrical furniture. As mentioned above, this is a kind of coil, which is mainly used for laying, so the effect of reducing noise and reducing vibration is very prominent. Of course, due to advances in technology, there are aluminum foil veneered glass wool felts on the market. Because of their strong heat and radiation resistance, the use as a lining material is still very good. Similarly, this type of coil product is used in many fields.

I believe that everyone knows what kind of material is glass wool felt. If you want to know more about this type of coil, you can consult the detailed staff.

Dehydrated White Radish Shreds

When I was a child, my family was short of supplies. When the radishes came down, my grandmother would make salted shredded radishes and store them for winter consumption. When making seasoned dehydrated shredded white radish, you can also use a household heater to separate it if there is not enough sunlight outside. When needed, the processed radishes can be placed on a clean bamboo curtain, close to the heater, and the heat released by the heater can dry the radishes. Dehydrated shredded white radish should be turned frequently during the drying process. After about four or five days, he can be dehydrated and air-dried. At this time, he can continue to bask for two days. It is then collected and placed in an airtight container. Homemade dehydrated shredded radish can be stored in a dry environment.

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