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Acoustically absorbent ceiling tile having barrier facing with diffuse reflectance

Inactive Publication Date: 2009-07-09
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014](b) positioning the ceiling tile within the environment to cause ambient sound to be absorbed and light to be reflected by the ceiling tile.

Problems solved by technology

Facings which are acoustically reflective undesirably contribute to the ambient noise.
These known facing materials have the disadvantage that they are open to the penetration of water, dust, mold and microorganisms, thus limiting their application in critical environments.

Method used

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  • Acoustically absorbent ceiling tile having barrier facing with diffuse reflectance
  • Acoustically absorbent ceiling tile having barrier facing with diffuse reflectance
  • Acoustically absorbent ceiling tile having barrier facing with diffuse reflectance

Examples

Experimental program
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examples

Test Methods

[0048]Basis Weight was measured by the method of ASTM D 3776, modified for specimen size, and reported in units of g / m2.

[0049]Tensile Strength was measured according to ASTM D5035 and reported in units of N / 25.4 cm.

[0050]Gurley Hill Porosity was measured according to TAPPI T460 and reported in seconds.

[0051]Frazier Air Permeability was measured according to ASTM D737-75 in CFM / ft2 at 125 Pa differential pressure.

[0052]Hydrostatic Head was measured according to AATCC TM 127, DIN EN 20811 with a test rate of 60 cm of H2O per minute.

[0053]Parker Surface Smoothness was measured according to TAPPI 555 at a clamping pressure of 1.0 MPa and is reported in micrometers.

[0054]Specific Airflow Resistance is equivalent to the air pressure difference across a sample divided by the linear velocity of airflow measured outside the sample and is reported in Ns / m3. The values reported herein were determined as follows. The volumetric air flow Q was calculated by dividing the air permeabil...

examples 1-2

[0063]Samples of acoustically absorbing material according to the invention were formed using a layer of open cell melamine foam (from Illbruck Acoustic Inc., Minneapolis, Minn.) having a thickness of 13 mm, a basis weight of 9.4 kg m3 and a specific airflow resistance of 120 rayls. A 0.1 mm thick, 17 g / m2 basis weight nylon 6, 6 spunbond scrim was laid on both sides of the foam and the scrims and foam were quilted together using a pattern of approximately 11 cm×11 cm diamonds. The acoustically absorbing samples were made by the lamination process described below. A vinyl acetate water based glue (WA 2173 available from efi Polymers, Denver, Colo.) was applied by a roller onto one surface of the quilted foam layer at a rate of approximately 0.3 kg / m2. A melt blown polyester nonwoven layer having a thickness of 20 mm, a basis weight of 0.33 kg / m2, and a specific airflow resistance of 130 rayls was laminated to the quilted foam layer to form the absorber core. A flash spun nonwoven fa...

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Abstract

An acoustically absorbent ceiling tile includes a core of acoustically absorbing material having two major surfaces, and a facing for covering the core on at least one major surface. The facing comprises a porous flash spun plexifilamentary film-fibril sheet having a coherent surface and comprising a plurality of pores having a pore diameter between about 100 nm and about 20,000 nm and a mean pore diameter of less than about 20,000 nm. The facing has highly diffuse reflectance of light, and a reflectance of greater than about 86%. The use of the facing improves the acoustic absorption of ambient sound at frequencies below about 1200 Hz. The facing provides a barrier to moisture and particles including microorganisms so that the ceiling tile is suitable for use in environments in which cleanliness is critical.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to ceiling tiles for use in a building interior.[0003]2. Description of the Related Art[0004]Acoustically absorbent ceiling tiles are known in the art for use reducing the amount of noise and / or reverberation within a given area, such as a building interior. In such ceiling tiles, a core of acoustically absorbing materials, i.e., materials having a high absorption coefficient, reduces noise by absorbing acoustic energy as sound waves strike and enter the acoustically absorbing material. Many known acoustically absorbing materials are formed of unconsolidated or partially unconsolidated, lofty fibrous materials including compressed fibers, recycled fiber or shoddy materials, fiberglass or mineral fiber batts and felts and require a facing to contain the core of fibrous materials. Other known acoustically absorbing core materials including foam, materials having a honeycomb structure, microperforated...

Claims

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Application Information

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IPC IPC(8): E04B1/84
CPCE04B2103/04E04B9/04
Inventor LEVIT, NATALIA V.TEATHER, ERIC W.
Owner EI DU PONT DE NEMOURS & CO
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