Abstract: A mesh structure comprises intersecting elongate members with each node at which they intersect being on the boundaries of four apertures in the mesh structure. One of said members has a locus which first defines the boundary between a first of said apertures and a second of said apertures, then transits said node and defines the boundary between a third of said apertures and the fourth of said apertures. The other of said members has a locus which first defines the boundary between said second and said third apertures, then transits said node and defines the boundary between said fourth and said first apertures. Said loci or said one member and said other member while transiting said node have such configurations that said members are knotted together.

Abstract: Mesh structure comprises an array of interconnected members of which some are pre-formed. At least some of the pre-formed members comprise or contain single elongate components of synthetic plastics material of which the molecular structure has been orientated in a direction corresponding to the longitudinal axis of said members.