Owens-corning Fiberglas Corporation

Owens Corning Fiberglas Technology, Inc.

Fred S Coffey

David V Stotler

Vijay K Varadan

Vasundara V Varadan

John L Olinger

Ray M Fulmer

Grant F Carruth

James E Wille

Kenneth B Carney

Thomas W Allen

Xiao-Qi Bao

A method for reducing noise generated by the operation of a noise-producing machine includes sensing the noise of the machine with a piezoelectric sensor, sending an activation signal, responsive to the sensed noise of the machine, to activate a piezoelectric actuator to reduce the noise of the machine, where the piezoelectric actuator is independent of a wave guide. Further, a parameter of the machine indicative of the speed of the machine is sensed with a second sensor, and the activation signal is corrected, responsive to the sensed parameter of the machine, to optimize the noise reduction of the piezoelectric material.

Active noise control using piezoelectric sensors and actuators

According to this invention there is provided a method for producing glass mat using glass having a relatively high alkali content which comprises chopping the glass fibers while wet and thereafter freezing the wet fiber glass in order to prevent leaching of the alkali constituents. The frozen glass fiber can then be crushed and used to prepare a glass fiber mat in a wet process.

Method for producing glass mat using glass having a relatively high

A method and apparatus for producing a mat of highly dispersed continuous glass filaments at increased throughput while maintaining desirable tensile strength characteristics by means of an oscillatable, fluidic distribution system.

Method and apparatus for producing a continuous glass filament mat

A method and apparatus for producing a mat of highly dispersed continuous glass filaments at increased throughput while maintaining desirable tensile strength characteristics is provided by means of an oscillatable, fluidic distribution system.

A method and apparatus for producing a mat of continuous glass filaments at increased throughput while maintaining desirable tensile strength characteristics by means of an oscillatable, fluidic distribution system.

A squirrel cage type long strand eliminator is provided intermediate the chopper and the collection region to eliminate undesirably long sections of strand from free falling discrete segments of strand as they are being formed from a continuous strand.

Apparatus for chopping strands

Two horizontally spaced parallel shafts (27,28) are rotatably mounted on a base plate (24) having an aperture (27a) therethrough. Each shaft has a plurality of rows of radially extending fingers (36). A casing (38,40) around the fingered portions of the shafts has an inlet throat (44) for receiving shopped strands (16). The shafts are operatively connected by a pair of gears (32,34), and a motor (30) connected to one of the shafts drives the shafts to move the fingers upwardly between the shafts for breaking up clumps of strands and carrying strands of a desired chopped length around the outer sides of the shafts for exit through the aperture. Excessively long strands become wrapped around one or the other of the shafts.

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Newark, OH, United States of America

Fred S Coffey