PROCESS FOR FORMING A BONDED NONWOVEN FABRIC

• US 3,617,417 A
• Filed: 04/25/1969
• Issued: 11/02/1971
• Est. Priority Date: 04/25/1969
• Status: Expired due to Term

• Current Assignee: M & J Fiber Technology Company Limited
• Original Assignee: Arthur R. Olson
• Inventors: Olson, Arthur R.
• Primary Examiner(s): Quarforth, Carl D.
• Assistant Examiner(s): Hellman, S. R.
• Application Number:
  US04/839,116
• Time in Patent Office: 921 Days
• Field of Search: 156/306,181,296,72 19/161P
• US Class Current: 156/181
• CPC Class Codes: B29C 65/10 using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
• CPC Class Codes: B29C 66/21 said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
• CPC Class Codes: B29C 66/45 Joining of substantially the whole surface of the articles methods or apparatus for laminating B32B37/00
• CPC Class Codes: B29C 66/69 General aspects of joining filaments bundling articles B65B13/00; interconnecting successive lengths of material B65H69/00
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/7294 Non woven mats, e.g. felt
• CPC Class Codes: B29C 66/73774 the to-be-joined areas of both parts to be joined being semi-crystalline
• CPC Class Codes: B29C 66/73921 characterised by the materials of both parts being thermoplastics
• CPC Class Codes: B29C 66/81241 being porous or sintered
• CPC Class Codes: B29C 66/83433 the contact angle between said rollers, cylinders or drums and said bands or belts being a non-zero angle
• CPC Class Codes: B29C 66/83435 said rollers, cylinders or drums being hollow
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: B29K 2067/003 PET, i.e. poylethylene terephthalate
• CPC Class Codes: B29K 2105/0854 in the form of a non-woven mat
• CPC Class Codes: D04H 1/542 Adhesive fibres

Abstract

A spot-bonded nonwoven fabric is made by supporting a web of textile-length fibers composed at least in part of thermoretractile fibers on a porous surface such as a screen. On the other surface of the web there is applied a screening member bearing a pattern of apertures, and a stream of heated gas is directed through the screening member and the web, to produce a spot-bonded nonwoven fabric wherein the fibers lying underneath the apertures are bonded to each other and are in a tensioned rectilinear configuration.

Claims

2. The process according to claim 1 wherein the apertures in the screening member constitute less than one-third of the total area of said screening member which comes in contact with said fibrous web.