Plastic material net structure

• US 5,053,264 A
• Filed: 12/14/1989
• Issued: 10/01/1991
• Est. Priority Date: 12/20/1988
• Status: Expired due to Term

• Current Assignee: RDB Plastotecnica, S.p.A.
• Original Assignee: RDB Plastotecnica, S.p.A.
• Inventors: Beretta, Mario
• Primary Examiner(s): Robinson, Ellis P.
• Assistant Examiner(s): Watkins, III, William P.
• Application Number:
  US07/450,499
• Time in Patent Office: 656 Days
• Field of Search: 428/131, 428/134, 428/135, 428/255, 428/910, 428/136, 428/167, 428/156, 428/500, 264/DIG. 81
• US Class Current: 428/131
• CPC Class Codes: B29C 55/04 uniaxial, e.g. oblique
• CPC Class Codes: B29D 28/00 Producing nets or the like, e.g. meshes, latticesby knotting D04G
• CPC Class Codes: B29L 2028/00 Nets or the like
• CPC Class Codes: Y10S 264/81 Plastic net
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/24298 Noncircular aperture [e.g., slit, diamond, rectangular, etc.]
• CPC Class Codes: Y10T 428/24306 Diamond or hexagonal
• CPC Class Codes: Y10T 428/24314 Slit or elongated
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/2457 Parallel ribs and/or grooves
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 442/184 Nonwoven scrim

Abstract

The plastic material net structure, particularly useful for geotechnical applications, has a plurality of holes uniformly arranged in rows and columns. The sheet further comprises portions which are elongated in the stretch direction, are mutually separated by the holes and have a predominance of molecules orientated in the stretch direction. The elongated portions extend from node elements which have a plurality of non-orientated molecules. The node elements are mutually joined by non-oriented transverse portions which extend between said holes in a direction which is substantially perpendicular to the elongated portions. The node elements have a thickness which is greater than the thickness of the transverse portions and of the elongated portions.

Claims

1. Plastic material net structure, comprising a sheet made of plastic material having a plurality of holes defined by a generally rectangular grid pattern of elongated portions and transverse portions interconnected by node elements, said sheet defining a plane of lay, said elongated portions extending in a stretch direction and being substantially orientated, said transverse portions extending substantially perpendicular to the stretch direction and being substantially non-orientated, said transverse portions defining a transverse portion thickness perpendicular to said plane of lay and said node elements defining a node element thickness perpendicular to said plane of lay, said transverse portion thickness being less than said node element thickness.

2. Plastic material net structure, comprising a sheet made of plastic material having a plurality of holes defined by a generally rectangular grid pattern of elongated portions and transverse portions interconnected by node elements, said sheet defining a plane of lay, said elongated portions extending in a stretch direction and being substantially orientated, said transverse portions extending substantially perpendicular to the stretch direction and being substantially non-orientated, said transverse portions defining a transverse portion thickness perpendicular to said plane of lay and said node elements defining a node element thickness perpendicular to said plane of lay, said transverse portion thickness being less than said node element thickness, said transverse portions being pre-stretched transverse portions with a pre-stretch ratio comprised between 1:

1 and 2.5;

1.

3. Plastic material net structure, comprising a sheet made of plastic material having a plurality of holes defined by a generally rectangular grid pattern of elongated portions and transverse portions interconnected by node elements, said sheet defining a plane of lay, said elongated portions extending in a stretch direction and being substantially orientated, said transverse portions extending substantially perpendicular to the stretch direction and being substantially non-orientated, said transverse portions defining a transverse portion thickness perpendicular to said plane of lay and said node elements defining a node element thickness perpendicular to said plane of lay, said transverse portion thickness being less than said node element thickness, said node elements being substantially non-orientated.

4. Net structure according to claim 3, wherein said node elements have protrusions which protrude from a single face of said sheet.

5. Net structure according to claim 3, wherein said node elements have protrusions which protrude from both faces of said sheet.