Nonwoven fiberous sheet of continuous strand material and the method of making same

• US 3,169,899 A
• Filed: 03/22/1961
• Issued: 02/16/1965
• Est. Priority Date: 11/08/1960
• Status: Expired due to Term

• Current Assignee: Walter Steuber
• Original Assignee: Walter Steuber
• Inventors: Steuber, Walter
• Application Number:
  US04/097,496
• Time in Patent Office: 1,427 Days
• US Class Current: 428/198
• CPC Class Codes: B63H 9/067 Sails characterised by their construction or manufacturing process
• CPC Class Codes: B63H 9/0678 Laminated sails
• CPC Class Codes: C04B 40/04 Preventing evaporation of the mixing water permanent coverings C04B41/00
• CPC Class Codes: D01D 10/02 Heat treatment heating for finishing D02J13/00
• CPC Class Codes: D01D 10/0445 using rollers with mutually inclined axes
• CPC Class Codes: D01D 5/11 Flash-spinning
• CPC Class Codes: D04H 13/00 Other non-woven fabrics
• CPC Class Codes: D04H 3/16 with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
• CPC Class Codes: D06N 3/045 with polyolefin or polystyrene (co-)polymers
• CPC Class Codes: Y10S 264/08 Fibrillating cellular materials
• CPC Class Codes: Y10S 264/47 Processes of splitting film, webs or sheets
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24826 Spot bonds connect components
• CPC Class Codes: Y10T 428/31681 Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
• CPC Class Codes: Y10T 428/31909 Next to second addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 442/2008 Fabric composed of a fiber or strand which is of specific structural definition
• CPC Class Codes: Y10T 442/608 Including strand or fiber material which is of specific structural definition
• CPC Class Codes: Y10T 442/637 Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material

Claims

1. A COHERENT, FLEXIBLE, NONWOVEN FIBROUS SHEET FROM WHICH THERE CAN BE REMOVED CONTINOUS LENGTHS OF PLEXIFILAMENTARY STRAND MATERIAL, SAID STRAND MATERIAL BEING DISPOSED IN MULTIDIRECTIONAL OVERLAPPING AND INTERSECTING ARRANGEMENT THROUGHOUT SAID SHEET, LYING GENERALLY PARALLEL TO THE MAJOR PLATE OF SAID SHEET, AND BEING SELF-BONDED TO PROVIDE A SHEET DENSITY GREATER THAN 7 LBS./FT.3 AND A TENSILE STRENGTH ABOVE 0.3 LB./IN//OZ./YD.2;

SAID STRAND MATERIAL FURTHER BEING COMPOSED OF NETWORKS HAVING A SURFACE AREA GREATER THAN 2M.2/G., COMPRISING A THREEDIMENSIONAL INTEGRAL PLEXUS OF SYNTHETIC ORGANIC, CRYSTALLINE POLYMERIC, FIBROUS ELEMENTS, SAID ELEMENTS BEING COEXTENSIVELY ALIGNED WITH THE NETWORK AXIS AND HAVING THE STRUCTURAL CONFIGURATION OF ORIENTED FILM-FIBRILS, AN AVERAGE FILM THICKNESS OF LESS THAN 4 MICRONS AND AN AVERAGE ELECTRON DIFRACTION ORIENTATION ANGLE OF LESS THAN 90*.