Process for making a perforated rigid sheet material for sound a

Details Process for making a perforated rigid sheet material for sound a Process for making a perforated rigid sheet material for sound a

1981-01-21

1983-06-28

Woo, Jay H.

Stock material or miscellaneous articles

Structurally defined web or sheet

Honeycomb-like

264 456, 264103, 264257, 428245, 428247, B32B 312

Patent

active

043905846

ABSTRACT:
A composite structure for absorbing sound energy, comprising an outer porous layer covering a cellular layer, wherein said porous layer is made by forming a supple loose fabric from slivers each constituted by a plurality of relatively free mineral or synthetic fibres, substantially parallel to one another and shaping said supple fabric to its final form and rendering it rigid by means of a hardenable resin, while being subjected to pressure so as to become a thin, rigid lattice, with wide crossed lines, virtually uniformly smooth on at least its face opposite said cellular layer.

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