公开(公告)号：US20180051392A1

公开(公告)日：2018-02-22

申请号：US15556859

申请日：2016-03-09

Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

Inventor： Wan Gyu HAHM ,  In Woo NAM ,  Seung Jin LEE ,  Do Kun KIM ,  Ki Sub LIM ,  Joo Hyung LEE ,  Gyu Dong LEE ,  Yeong Og CHOI ,  Byeong Jin YEANG

IPC: D01D5/084 ,  D01D5/088 ,  D01D5/098 ,  D01D5/30 ,  D01D5/32 ,  D01F6/62 ,  D01F8/14 ,  D01F6/60 ,  D01F8/12 ,  D01F6/06 ,  D01F8/06

Abstract: Provided is a method of manufacturing high strength synthetic fibers, and high strength synthetic fibers manufactured using the same. More particularly, the method involves a localized heating process by raising the temperature of a molten spinning fiber to a temperature higher than that of a pack body during a short period of time with no degradation through a heating zone located in the immediate vicinity of capillary in the spinning nozzle, so as to effectively control the molecular entanglement structure in the molten polymer without reducing the molecular weight and thus to enhance the drawability of the as-spun fibers, thereby improving the mechanical properties of the as-spun fibers, such as strength, elongation, etc., using the existing processes of melt spinning and drawing and thus enabling a mass production of a high-performance fiber at low cost.

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.

公开(公告)号：US20210238768A1

公开(公告)日：2021-08-05

申请号：US16098442

申请日：2017-04-24

Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

Inventor： Wan Gyu HAHM ,  In Woo NAM ,  Seung Jin LEE ,  Ki Sub LIM

IPC: D01D4/02 ,  D01D5/084 ,  D01D10/02

Abstract: The present invention relates to a spinning nozzle apparatus for manufacturing a high-strength fiber.
The spinning nozzle apparatus for manufacturing a high-strength fiber according to the present invention is designed to optimize a heating method for the spinning region of a spinning nozzle in the melt spinning process. The heat transfer method is optimized by disposing the spinning nozzle holes of spinning nozzle commercially available on the outside of, directly under the pack body and heating the spinning nozzle holes with a heating body. In addition, an instantaneous heat treatment at high temperature is adopted to control the molecular entanglement structure in the melted polymer, which enhances the drawability of the thermoplastic resin and hence improves the mechanical properties such as strength and elongation.