Importance

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Abstract

A filament reinforced perforate composite sheet is manufactured by forming a filament assembly which includes reinforcing filament structures and passage forming filament structures and in which the passage forming filament structures extend from the front face to the rear face of the assembly, applying a matrix material to the assembly to form a composite sheet in which the passage forming filament structures extend from the front face to the rear face of the sheet and removing the passage forming filament structures or a part or parts thereof to produce a multiplicity of passages extending through the composite sheet. The passage forming filament structures may be continuous monofilaments which may be hollow, an assembly of continuous filaments in the form of a tow or twisted together or a yarn spun from short fibers and the material from which they are made is so selected that they can be melted or dissolved out of the sheet or withdrawn in their original state or parts of the hollow monofilaments removed to form the passages through the sheet.

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First Claim