公开(公告)号：US20240295052A1

公开(公告)日：2024-09-05

申请号：US18661723

申请日：2024-05-13

Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

Inventor： Wan Gyu HAHM ,  Byeong Jin YEANG ,  Young Chan CHOI ,  Hyun Ju OH

IPC: D04H1/4291 ,  D01D5/08

CPC classification number: D04H1/4291 ,  D01D5/08 ,  D10B2321/022 ,  D10B2331/04

Abstract: A method for manufacturing a melt-spun nonwoven fabric, in which fibers obtained by melt-spinning a thermoplastic polymer through a spinning nozzle having at least one or more nozzle holes are collected by high-speed air stream according to a spunbond method, includes: the steps of: allowing the melt-spun fibers to pass through local nozzle heaters of a nozzle heating mantle located just on the underside of the spinning nozzle during the spinning; and allowing the melt-spun fibers to be subjected to momentary local heating with a temperature difference of 0.1 to 1,000° C. from a temperature of a pack body. Polypropylene (PP) having a melt flow index (MFI) of 3 to 900 or polyethylene terephthalate (PET) having intrinsic viscosity (I.V.) of 0.5 to 3.0 is subjected to momentary local heating to a high temperature during the spinning to thus perform fiber fineness.

公开(公告)号：US20220002922A1

公开(公告)日：2022-01-06

申请号：US17292718

申请日：2019-12-02

Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

Inventor： Wan Gyu HAHM ,  Byeong Jin YEANG ,  Young Chan CHOI ,  Hyun Ju OH

IPC: D04H1/4291

Abstract: The present invention relates to a method manufacturing a melt-spun nonwoven fabric and a microfiber nonwoven web manufactured therefrom The present invention relates to a method for manufacturing a melt-spun nonwoven fabric, in which fibers obtained by melt-spinning a thermoplastic polymer through a spinning nozzle including at least one nozzle hole are collected by high-speed air stream, wherein the melt-spun fibers are subjected to momentary local heating at a high temperature higher than a spinning temperature while same are caused to pass through a nozzle local heating provided directly under the spinning nozzle during spinning, so that the method can lower the melt flow index and spinline elongation viscosity of a thermoplastic resin discharged from the nozzle hole without reducing a molecular weight, thereby providing a microfiber nonwoven web formed by finely thin fibers, compared to the conventional spun-bond nonwoven fabric.