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Acoustic elements and their production

A technology of acoustic components and components, applied in the direction of building components, textiles, fabrics, etc., can solve the problems of reducing sound absorption performance, weak structure, increasing density, etc., and achieve the effect of good acoustic performance and high flatness

Inactive Publication Date: 2011-03-30
ROCKWOOL INT AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But carding results in a weaker structure, so the density must be high in order for the product to have sufficient structural integrity
Increased density and additional process steps increase the cost of the element and may reduce sound absorption performance

Method used

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  • Acoustic elements and their production
  • Acoustic elements and their production
  • Acoustic elements and their production

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] Using the process shown in FIG. 2, a primary net 11 having a weight per unit area of ​​340 g / m2 is formed on the collector 10 and cross-overlapped by the pendulum 8 to form a secondary net 15A having 5.6 layers thick and had a weight per unit area of ​​1.9 kg / m2 and a density of 15 kg / m3.

[0077] It was subjected to vertical compression using conveyor 16 to increase the density of web 15B to 32 kg / m3.

[0078] The conveyors 14, 16 and 17 all move at substantially the same speed so that the secondary web 15 moves through the conveyor 17 at a speed of 23 meters per minute.

[0079] The conveyor 18 moves at a speed of 7.8 meters per minute, providing a longitudinal compression of approximately 2.9:1. The fiber strand 15C at point F has a density of 88 kg / m3.

[0080] Conveyor 19 moves at a speed of 9.2 meters per minute, provides a decompression of 0.85:1, a total longitudinal compression of 2.5:1 and has a weight per unit area of ​​4.8 kg / m2 and a density of 89 kg / m3 a...

example 2

[0086] The process was performed essentially as described in Example 1, except that the relative speed of conveyor 18 with respect to 14, 16 and 17 provided a decompression of 0.9 instead of 0.85, and the total longitudinal compression was 2.0 instead of 2.5, at point H The thickness is 132 mm and vertical compression compresses it to 47 mm, increasing the density to 150 kg / m3. After cutting and grinding, each fiber strip had a thickness of approximately 21 millimeters, and wool was then bonded to each cut surface.

example 3

[0088]To demonstrate the importance of changing the length compression, and thus the Z-direction composition of the fibers extending from the front, for thinner products, the process was carried out essentially as in Example 1, so that the fiber strip 15D passed through the curing oven had a thickness of 40 mm , and the fiber strip 15C before vertical compression had a thickness of 60 mm and had respective amounts of longitudinal compression. It has been found that when the total longitudinal compression is 1.6:1, the flatness value is 2.05 (standard deviation 0.27). It's not as flat as desired. When the total longitudinal compression is 2:1, the flatness value is 1.59 (standard deviation of 0.2) and when the total longitudinal compression is 2.5:1, the flatness value is 1.55 (standard deviation of 0.15). This clearly demonstrates the advantage of a longitudinal compression greater than 1.6:1, preferably at least 2:1, thereby increasing the Z-direction component adjacent to t...

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PUM

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Abstract

Acoustic element (1) has a flat, sound-receiving, front face (2) which extends in the XY plane and has a good sound-absorption coefficient, and the element is formed of a bonded batt of air laid mineral fibres having a density of 70 to 200kg / m<3> wherein the fibres extend from the front face (2) and at least through the front half of the thickness of the batt have a Z direction component greater than the Z direction component of conventional air laid products, and the front face of the batt is a cut and abraded face. The element can be made by air laying mineral fibres and binder, reorientingthe fibres to provide an increased fibre orientation in the Z direction, curing the binder to form a cured batt and cutting the cured batt in the XY plane into two cut batts and smoothing each cut surface by abrasion to produce a flat face on each cut batt.

Description

technical field [0001] The present invention relates to acoustic elements made of airlaid mineral fibers. Background technique [0002] Acoustic elements (commonly referred to as baffles or sound-absorbing tiles) have front and rear faces extending along the XY plane and sides extending along the Z direction between the front and rear faces. The front is the side facing the room or other space and beneficial to the sound absorption performance, which should have a good sound absorption coefficient α w , usually at least 0.7 or greater. [0003] The appearance of a ceiling or wall formed by acoustic elements should improve as the front approaches a true plane. On a scale where 1 indicates the flattest surface available in known elements made of mineral fibers and 6 indicates the lowest grade that can be considered commercially suitable for low-grade products, grades 1 or 2 are the best and usually required for high-quality tiles, while class 3 or even 4 may be suitable for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/86D04H1/74E04B9/00D04H1/4218D04H1/4226E04B1/84E04B9/04E04B9/28
CPCE04B9/0435D04H1/4226E04B2001/8457E04B9/001E04B1/86E04B9/28D04H1/4218E04B2001/8245Y10T428/24777Y10T442/644
Inventor J·伯奇G·R·延森L·博尔伦
Owner ROCKWOOL INT AS