A soundproofing material made of nonwoven materials containing thermoplastic fibers for the acoustic frequency range of 100 to 5000 Hz is characterized in that the nonwoven material is permanently compacted to a specific flow resistance of RS=800-1400 Ns/m.sup.3 in two stages by a mechanical compaction process and a subsequent pressure/heat treatment.
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Thanks to the improved water quality, Yangcheng Lake crabs breed well and grow plump. [Read more] |
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