초록 ▼

A composite sheet material for use as a planar drain and a protection board. The sheet material has a multi-layer construction formed into a composite by needling. The multi-layer construction preferably has a layer of a soft nonwoven fabric material sandwiched between outer layers of a stiffened fa

A composite sheet material for use as a planar drain and a protection board. The sheet material has a multi-layer construction formed into a composite by needling. The multi-layer construction preferably has a layer of a soft nonwoven fabric material sandwiched between outer layers of a stiffened fabric material. The composite material may be configured into relatively narrow longitudinal strips for use as a wicking drain. Such longitudinal strips may often have a width of approximately three (3) inches or less in exemplary constructions.

대표청구항 ▼

[ What is claimed is:] [1.] A composite material comprising:a first layer of a soft nonwoven fabric material having a thickness and a planar weight sufficient to facilitate flow of a fluid along a plane of said first layer:a second layer of a stiffened fabric material attached to a first planar side

[ What is claimed is:] [1.] A composite material comprising:a first layer of a soft nonwoven fabric material having a thickness and a planar weight sufficient to facilitate flow of a fluid along a plane of said first layer:a second layer of a stiffened fabric material attached to a first planar side of said first layer, said stiffened fabric material being rigid relative to said first layer;a third layer of said stiffened fabric material, rigid relative to said first layer, attached to a second planar side of said first layer opposite said first planar side; and,said layers being arranged such that said composite material has a structure defined by outer layers of said stiffened fabric material with said soft nonwoven fabric material sandwiched therebetween such that said composite material exhibits a degree of rigidity greater than said soft nonwoven fabric material and wherein fluid passing into said soft nonwoven fabric material can flow in said plane.