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    Method for preparing microporous PVA fiber
    1.
    发明授权
    Method for preparing microporous PVA fiber 有权

    公开(公告)号：US11624131B2

    公开(公告)日：2023-04-11

    申请号：US17144103

    申请日：2021-01-07

    申请人： Zhejiang Hongyu Medical Commodity Co., Ltd.

    发明人： Juhong Zeng

    IPC分类号： D01D7/00 ,  D01F6/14 ,  D01D1/02 ,  D01D5/06 ,  D01D10/02 ,  D01D10/06 ,  D01F11/06 ,  D01D5/247 ,  D01F1/08

    摘要： The present application discloses a method for preparing microporous PVA fiber comprising the following steps: Step 1: preparing spinning solution, calcium hydroxide solution, and sodium sulfate solution; Step 2: cooling the spinning solution to 40-60° C., and adding a foaming agent thereto to provide the PVA spinning stock solution; Step 3: spinning into the sodium sulfate solution so that the fiber containing the reaction product of the foaming agent and the mirabilite is dehydrated to provide a primary PVA fiber; Step 4: reacting the fiber with the calcium hydroxide solution to provide a secondary fiber; Step 5: foaming and pore forming; and Step 6: cleaning and drying to provide the final product of microporous PVA fiber.

    SIDE-BY-SIDE SELF-CRIMPING ELASTIC FIBER AND PREPARATION METHOD THEREFOR
    2.
    发明申请
    SIDE-BY-SIDE SELF-CRIMPING ELASTIC FIBER AND PREPARATION METHOD THEREFOR 有权

    公开(公告)号：US20230026569A1

    公开(公告)日：2023-01-26

    申请号：US17788309

    申请日：2020-06-11

    申请人： JIANGSU HENGLI CHEMICAL FIBRE CO., LTD.

    发明人： Hongwei FAN ,  Lili WANG ,  Fangming TANG ,  Aiqi KANG ,  Shanshui WANG

    IPC分类号： D01D5/32 ,  D01D10/02 ,  D01D5/08 ,  D01F8/14 ,  D01F8/12 ,  D01D5/22

    摘要： A type of side-by-side self-crimping elastic fiber and preparation method thereof are disclosed. The preparation method includes distributing compatible or partially compatible first fiber-forming polymer melts and second fiber-forming polymer melts, then the fiber is extruded from first spinneret holes and second spinneret holes on the same spinneret. The first fiber-forming polymer melts and the second fiber-forming polymer melts flow into the first spinneret holes through first and second distribution holes, and flow into the second spinneret holes through third and fourth distribution holes, wherein the four distribution holes are cylindrical holes of equal height, the ratio of the diameter of the first distribution holes to the diameter of the second distribution holes is (1.10-1.20):1, and the ratio of the diameter of the third distribution holes to the diameter of the fourth distribution holes is 1:(1.10-1.20).

    PREPARATION METHOD OF SELF-CRIMPING ELASTIC COMBINED FILAMENT YARN FOR KNITTING
    3.
    发明申请
    PREPARATION METHOD OF SELF-CRIMPING ELASTIC COMBINED FILAMENT YARN FOR KNITTING 有权

    公开(公告)号：US20230026102A1

    公开(公告)日：2023-01-26

    申请号：US17787951

    申请日：2020-06-10

    申请人： JIANGSU HENGLI CHEMICAL FIBRE CO., LTD.

    发明人： Hongwei FAN ,  Fangming TANG ,  Shanshui WANG ,  Lixin YIN ,  Lili WANG

    IPC分类号： D01D5/32 ,  D01D5/08 ,  D01D5/22 ,  D01D10/02 ,  D01F8/12 ,  D01F8/14

    摘要： A preparation method of self-crimping elastic combined filament yarns for knitting is disclosed, wherein the combined filament yarns are extruded from the same spinneret; a first fiber-forming polymer melt is divided into two ways, one is directly extruded after distribution; and the other is extruded after distribution by side-by-side composite spinning together with a second fiber-forming polymer melt; the first fiber-forming polymer and the second fiber-forming polymer are compatible or partially compatible; on the same spinneret, a ratio of the number of spinneret holes m for direct extrusion to the number of spinneret holes n for extrusion after distribution by side-by-side composite spinning is 1:(5-10); the self-crimping elastic combined filament yarns for knitting are prepared according to specific spinning processes, wherein the combined filament yarn mainly comprises a first fiber-forming polymer monofilament and a first/second fiber-forming polymer side-by-side composite monofilament; wherein the monofilament crimping directions are randomly distributed.

    Method and device for stabilizing precursor fibers for the production of carbon fibers
    5.
    发明授权
    Method and device for stabilizing precursor fibers for the production of carbon fibers 有权

    公开(公告)号：US11486059B2

    公开(公告)日：2022-11-01

    申请号：US16970411

    申请日：2019-03-11

    申请人： CENTROTHERM INTERNATIONAL AG

    发明人： Andreas Keller ,  Gunter Fauth ,  Uwe Ziegler

    IPC分类号： B29C71/02 ,  F27B5/04 ,  F27B9/04 ,  F27B9/28 ,  F27D7/06 ,  D01F9/22 ,  D01D10/02 ,  D01F9/17 ,  D01F9/32 ,  B29C71/00 ,  D02J13/00 ,  F27B9/12

    摘要： The invention relates to a method and to a device for stabilizing precursor fibers for the production of carbon fibers. In the method, precursor fibers are first heated to a first temperature and held at the temperature for a predefined duration. Subsequently, the precursor fibers are heated to at least one second temperature, which is higher than the first temperature, and held at said temperature for a predefined duration. During each heating and between the heating steps, the precursor fibers are in a gas atmosphere having a negative pressure in the range between 12 mbar and 300 mbar and having an oxygen partial pressure of 2.5 to 63 mbar. The device has at least one evacuable, elongate vacuum chamber for feeding the precursor fibers through, at least two lock units and at least one heating unit. At least one lock unit is used for the sealed insertion of precursor fibers into the at least one vacuum chamber, while at least one other lock unit is used for the sealed removal of precursor fibers from the at least one vacuum chamber. The heating unit has at least two individually controllable heating elements, which are suitable for heating the at least one vacuum chamber to at least two different temperatures in heating zones which are adjacent in the longitudinal direction.