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Fibrous material having densified surface for improved air flow resistance and method of making

a technology of densified surface and fibrous material, which is applied in the field of fibrous blanket materials, can solve the problems of difficult to meet such stringent tolerances, and achieve the effect of improving airflow resistance and airflow resistan

Inactive Publication Date: 2006-11-16
OCV INTELLECTUAL CAPITAL LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides fibrous materials with improved airflow resistance that can be customized for different applications by adding or removing densified portions. These materials can be used alone or in combination with other sound control materials. The invention also includes a method for manufacturing the materials by applying heat or pressure to specific areas. The technical effect of the invention is improved airflow resistance, which can help control the flow of air and reduce noise in various situations.

Problems solved by technology

Meeting such stringent tolerances is difficult when a blanket of randomly distributed fibers is heated to a controlled temperature, pressure and time to control the density and airflow resistance required to “tune” a fibrous blanket to attenuate noise at selected frequencies.

Method used

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  • Fibrous material having densified surface for improved air flow resistance and method of making
  • Fibrous material having densified surface for improved air flow resistance and method of making
  • Fibrous material having densified surface for improved air flow resistance and method of making

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examples

[0037] Acoustical veils were fabricated according to the present invention by pressing a patterned foraminous plate heated to 375° F. between top and bottom plates on a 30-ton press. The wet process veil used is a 100 gram per square meter, 1.5 denier PET and 1.5-denier PET / PET bicomponent fiber blend. The temperature and pressure cause the veil to densify to between 75% to 100% of the density of the material of the unprocessed veil. The resulting acoustical veils had densified areas of about 40%, 58% and 90% and were determined to have acoustical impedances of 500, 1300 and 3500 Rayls. The pattern and properties of the veils are shown in Table 1. The Log of the acoustical impedance (Rayls) and the Log of the percentage of compressed area are shown in Table 2.

TABLE 1Ex. 1Ex. 2Ex. 3Individual Circle Area(mm)31.677.921.94Undensified Area(mm2)2216.841615.13185.85Total Area(mm2)3658.273844.551800.87Densified Area(mm2)1441.432229.421615.02% Compressed39.4057.9989.68% Raised60.6042.0110...

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Abstract

The present invention provides a fibrous veil having a plurality of densified portions formed thereon for improved airflow resistance. The airflow resistance may be tuned to meet the needs of a particular application by selecting the size, density and location of the densified portions. The veil may be used independently or in combination with other sound control materials. The present invention also provides a fibrous blanket having a plurality of densified portions formed on one or both major surfaces thereof for improved airflow resistance. The airflow resistance may be tuned to meet the needs of a particular application by selecting the size and density of the densified portions. A method of manufacturing the materials of the present invention by applying heat and / or pressure to portions of the material is also presented.

Description

TECHNICAL FIELD AND INDUSTRIAL APPLICABILITY OF THE INVENTION [0001] The present invention relates generally to acoustical products, and more particularly, to fibrous blanket materials having a plurality of densified portions formed on a surface thereof for improved airflow resistance. The airflow resistance may be tuned to meet the needs of a particular application by selecting the size and density of the densified portions. BACKGROUND OF THE INVENTION [0002] Sound insulation materials are used in a variety of settings where it is desired to dampen noise from an external source. For example, insulation materials have been used in applications such as in appliances to reduce the sound emitted into the surrounding areas of a home, in automobiles to reduce mechanical sounds of the motor and road noise, and in office buildings to attenuate sound generated from the workplace. Acoustical insulation typically relies upon both sound absorption (that is, the ability to absorb incident sound...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04B1/82E04B2/02
CPCG10K11/162E04B1/84
Inventor LOFTUS, JAMES E.BLOCK, THOMAS T.TILTON, JEFFREY A.
Owner OCV INTELLECTUAL CAPITAL LLC