Patents by Inventor Wan-Gyu Hahm
Wan-Gyu Hahm has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20250084564Abstract: The present disclosure relates to a method of manufacturing a high-strength sheath-core type synthetic fiber and high-strength sheath-core type synthetic fiber manufactured thereby, the method including forming a fiber by melt-spinning a thermoplastic polymer of a sheath component and a core component through a spinning pack including a sheath-core type bicomponent spinning nozzle; performing a heat treatment by allowing a molten fiber to pass through a heating zone disposed directly below the spinning nozzle during the melt-spinning; cooling the heat-treated fiber; and drawing the cooled fiber, wherein the sheath component includes a resin including the sheath component having elongation viscosity and thermal conductivity lower and specific heat higher than those of a resin included in the core component, and an ultra-fine high-strength synthetic fiber satisfying predetermined strength or higher as compared to a fine diameter and intrinsic viscosity may be provided.Type: ApplicationFiled: November 22, 2024Publication date: March 13, 2025Inventors: Wan-Gyu HAHM, Jong-Hyuk BAE, Hyun-Ju OH, Kuk-Hyun JO
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Publication number: 20240295052Abstract: 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.Type: ApplicationFiled: May 13, 2024Publication date: September 5, 2024Inventors: Wan Gyu HAHM, Byeong Jin YEANG, Young Chan CHOI, Hyun Ju OH
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Patent number: 12018415Abstract: The present invention relates to a method for 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.Type: GrantFiled: December 2, 2019Date of Patent: June 25, 2024Assignee: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGYInventors: Wan Gyu Hahm, Byeong Jin Yeang, Young Chan Choi, Hyun Ju Oh
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Patent number: 11255025Abstract: 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.Type: GrantFiled: April 24, 2017Date of Patent: February 22, 2022Assignee: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGYInventors: Wan Gyu Hahm, In Woo Nam, Seung Jin Lee, Ki Sub Lim
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Publication number: 20220002922Abstract: 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.Type: ApplicationFiled: December 2, 2019Publication date: January 6, 2022Inventors: Wan Gyu HAHM, Byeong Jin YEANG, Young Chan CHOI, Hyun Ju OH
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Publication number: 20210238768Abstract: 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.Type: ApplicationFiled: April 24, 2017Publication date: August 5, 2021Inventors: Wan Gyu HAHM, In Woo NAM, Seung Jin LEE, Ki Sub LIM
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Patent number: 10584430Abstract: The present invention discloses a security yarn containing a multi-composite spinning fiber and security products using the same. The multi-composite spinning fiber, according to the present invention, contains, in at least one or more kinds of polymer materials, a first component selected from an IR reactive pigment or an IR absorption pigment, a second component selected from a visible pigment or an invisible UV-reactive fluorescent pigment, and a third component selected from X-ray absorption materials, so that the security yarn containing the multi-component spinning fiber can be identified by infrared and ultraviolet wavelength and easily identified when irradiated with X-rays, thus providing a multi-identification capability and being useful for preventing counterfeiting.Type: GrantFiled: October 15, 2013Date of Patent: March 10, 2020Assignee: Korea Institute of Industrial TechnologyInventors: Wan-Gyu Hahm, Sung Won Byun, Byeong Jin Yeang, In Woo Nam, Seung Jin Lee, Do Gun Kim, Ki Sub Lim
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Patent number: 10422052Abstract: 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.Type: GrantFiled: March 9, 2016Date of Patent: September 24, 2019Assignee: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGYInventors: 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
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Patent number: 10266967Abstract: A method and apparatus for fabricating a conjugate fiber. Resins having different properties, for example, resins of the same or different components including functional pigments or substances are continuously and alternatively discharged in an endless state by operating a spinning nozzle unit in a melting state, thereby fabricating the conjugate fiber having the different properties in the longitudinal direction of the fiber, and having various surface effects and patterns in the longitudinal direction of the fiber. A conjugate fiber fabricated by the above apparatus and method is also provided.Type: GrantFiled: September 11, 2013Date of Patent: April 23, 2019Assignee: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGYInventors: Wan-Gyu Hahm, Sung Won Byun, Byeong Jin Yeang, In Woo Nam, Seung Jin Lee, Do Gun Kim, Ki Sub Lim
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Publication number: 20180051392Abstract: 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.Type: ApplicationFiled: March 9, 2016Publication date: February 22, 2018Inventors: 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
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Patent number: 9333721Abstract: A multiple fiber spinning apparatus and a method of controlling the same. The apparatus includes an extruding unit, a spin block unit and a spinning nozzle unit. The extruding unit includes extruders that melt, extrude and transfer polymer materials. The spin block unit includes a gear pump unit which has gear pumps connected to each of the extruders. The gear pumps receive the polymer materials from the corresponding extruders and discharge the polymer materials. The spin block unit further includes a flow passage unit which has flow passages connected to the respective gear pumps. The spinning nozzle unit includes spinning nozzles, each of which is connected to one of the gear pumps of each extruder by the corresponding flow passage, so that each spinning nozzle receives the molten polymer materials and spins the polymer materials into a fiber.Type: GrantFiled: November 16, 2011Date of Patent: May 10, 2016Assignee: Korea Institute of Industrial TechnologyInventors: Wan-Gyu Hahm, Sung Won Byun, Dae Young Lim, Min Sun Kim, Byeong Jin Yeang
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Publication number: 20150329996Abstract: The present invention discloses a security yarn containing a multi-composite spinning fiber and security products using the same. The multi-composite spinning fiber, according to the present invention, contains, in at least one or more kinds of polymer materials, a first component selected from an IR reactive pigment or an IR absorption pigment, a second component selected from a visible pigment or an invisible UV-reactive fluorescent pigment, and a third component selected from X-ray absorption materials, so that the security yarn containing the multi-component spinning fiber can be identified by infrared and ultraviolet wavelength and easily identified when irradiated with X-rays, thus providing a multi-identification capability and being useful for preventing counterfeiting.Type: ApplicationFiled: October 15, 2013Publication date: November 19, 2015Inventors: Wan-Gyu Hahm, Sung Won Byun, Byeong Jin Yeang, In Woo Nam, Seung Jin Lee, Do Gun Kim, Ki Sub Lim
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Publication number: 20150240385Abstract: A method and apparatus for fabricating a conjugate fiber. Resins having different properties, for example, resins of the same or different components including functional pigments or substances are continuously and alternatively discharged in an endless state by operating a spinning nozzle unit in a melting state, thereby fabricating the conjugate fiber having the different properties in the longitudinal direction of the fiber, and having various surface effects and patterns in the longitudinal direction of the fiber. A conjugate fiber fabricated by the above apparatus and method is also provided.Type: ApplicationFiled: September 11, 2013Publication date: August 27, 2015Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGYInventors: Wan-Gyu Hahm, Sung Won Byun, Byeong Jin Yeang, In Woo Nam, Seung Jin Lee, Do Gun Kim, Ki Sub Lim
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Publication number: 20130200544Abstract: A multiple fiber spinning apparatus and a method of controlling the same. The apparatus includes an extruding unit, a spin block unit and a spinning nozzle unit. The extruding unit includes extruders that melt, extrude and transfer polymer materials. The spin block unit includes a gear pump unit which has gear pumps connected to each of the extruders. The gear pumps receive the polymer materials from the corresponding extruders and discharge the polymer materials. The spin block unit further includes a flow passage unit which has flow passages connected to the respective gear pumps. The spinning nozzle unit includes spinning nozzles, each of which is connected to one of the gear pumps of each extruder by the corresponding flow passage, so that each spinning nozzle receives the molten polymer materials and spins the polymer materials into a fiber.Type: ApplicationFiled: November 16, 2011Publication date: August 8, 2013Applicant: Korea Institute of Industrial TechnologyInventors: Wan-Gyu Hahm, Sung Won Byun, Dae Young Lim, Min Sun Kim, Byeong Jin Yeang