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Meltblown die and method

  • US 4,526,733 A
  • Filed: 11/17/1982
  • Issued: 07/02/1985
  • Est. Priority Date: 11/17/1982
  • Status: Expired due to Term
First Claim
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1. In a method of forming a nonwoven web comprising the steps of:

  • (a) providing a molten thermoplastic polymer,(b) spinning said molten polymer through one or more die tip orifices,(c) contacting said spun polymer while hot as it exits said die tip orifice or orifices with a fluid stream to form filaments and attenuate said filaments into microfibers having an average diameter in the range of up to about 10 microns,(d) collecting said drawn filaments, and(e) bonding said filaments to form an integrated web,the improvement wherein said fluid stream is provided at about the lowest temperature of available fluid without significant artificial cooling when contacting the polymer, said low temperature fluid stream is insulated from said molten polymer at the die tip, and the forming distance is about 8 inches or less.

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