Patents Assigned to HOKUETSU KISHU PAPER CO., LTD.
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Publication number: 20180200655Abstract: A method for manufacturing a filter medium for an air filter having improved particle collection performance using cellulose nanofibers. The method for manufacturing a filter medium for an air filter comprises: causing a mixed solution containing cellulose nanofibers and a dispersion medium to adhere to an air-permeable support; and subsequently freeze-drying the resulting product, in which a number average fiber diameter of the cellulose nanofibers is 1 to 50 nm, the dispersion medium is a mixed dispersion medium of water and a water-soluble organic solvent, and a solid content concentration of the cellulose nanofibers in the mixed solution is 0.001 to 0.150% by mass.Type: ApplicationFiled: August 3, 2015Publication date: July 19, 2018Applicants: Hokuetsu Kishu Paper Co., Ltd., The University of TokyoInventors: Junji NEMOTO, Akira ISOGAI, Tsuguyuki SAITO
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Patent number: 9889411Abstract: Provided is a nonwoven fabric for semipermeable membrane support, in which adhesiveness of a semipermeable membrane to a support is satisfactory, the thickness uniformity of the semipermeable membrane is satisfactory, and permeation-through of a coating liquid does not occur.Type: GrantFiled: January 11, 2013Date of Patent: February 13, 2018Assignee: HOKUETSU KISHU PAPER CO., LTD.Inventors: Toshihiko Soyama, Junji Nemoto, Hisashi Hamabe
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Patent number: 9656196Abstract: A filter media for an air filter having a PF value higher than ever, and an air filter provided with the same. The filter media for an air filter is composed of wet-laid nonwoven fabric containing a glass fiber having an average fiber diameter of less than 1 and a binder fiber, and wherein the wet-laid nonwoven fabric contains a fluorine resin and a surfactant, and does not contain a resin binder or contains a binder resin in an amount of 50% by mass or less based on the fluorine resin.Type: GrantFiled: January 30, 2014Date of Patent: May 23, 2017Assignee: HOKUETSU KISHU PAPER CO., LTD.Inventors: Masashi Sato, Hiroyuki Yamamoto, Eiko Meguro, Junji Nemoto, Toshihiko Soyama
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Patent number: 9328211Abstract: A porous body that contains cellulose nanofibers having very thin fiber diameters and high hydrophilicity, and has a large specific surface area, and to provide a method of producing the porous body simply with low cost. A method of producing a porous cellulose comprises a process of lyophilizing a mixed liquid containing cellulose nanofibers and a dispersion medium, wherein the dispersion medium is a mixed dispersion medium of water and an organic solvent dissolving in water, a concentration of the organic solvent in the mixed dispersion medium is 2 to 40 mass %, and a solid content concentration of the cellulose nanofibers in the mixed liquid is 0.001 to 5 mass %.Type: GrantFiled: May 15, 2013Date of Patent: May 3, 2016Assignees: HOKUETSU KISHU PAPER CO., LTD., THE UNIVERSITY OF TOKYOInventors: Junji Nemoto, Toshihiko Soyama, Akira Isogai, Tsuguyuki Saito
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Publication number: 20150093560Abstract: A porous body that contains cellulose nanofibers having very thin fiber diameters and high hydrophilicity, and has a large specific surface area, and to provide a method of producing the porous body simply with low cost. A method of producing a porous cellulose comprises a process of lyophilizing a mixed liquid containing cellulose nanofibers and a dispersion medium, wherein the dispersion medium is a mixed dispersion medium of water and an organic solvent dissolving in water, a concentration of the organic solvent in the mixed dispersion medium is 2 to 40 mass %, and a solid content concentration of the cellulose nanofibers in the mixed liquid is 0.001 to 5 mass %.Type: ApplicationFiled: May 15, 2013Publication date: April 2, 2015Applicants: THE UNIVERSITY OF TOKYO, HOKUETSU KISHU PAPER CO., LTD.Inventors: Junji Nemoto, Toshihiko Soyama, Akira Isogai, Tsuguyuki Saito
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Patent number: 8951324Abstract: The objective of the present invention is to provide an air filter medium having a lower pressure drop and higher efficiency as compared to an air filter medium currently in use. This objective is achieved by providing an air filter medium characterized by comprising glass short fibers as its main fibers in which the constituent fibers are dispersed uniformly and, when the constituting fibers at a diluted concentration of 0.04% by mass are allowed to stand for 12 hours, the sedimentation volume is 450 cm3/g or greater.Type: GrantFiled: May 6, 2011Date of Patent: February 10, 2015Assignee: Hokuetsu Kishu Paper Co. Ltd.Inventors: Toshihiko Soyama, Hiroshi Kuwano
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Publication number: 20150004865Abstract: The present invention addresses the problem of providing a nonwoven fabric for semipermeable membrane supporting body, which gives fine MD curl when a semipermeable membrane coating liquid is coated on the supporting body (nonwoven fabric) and cured, and a method for producing the nonwoven fabric.Type: ApplicationFiled: February 15, 2013Publication date: January 1, 2015Applicant: Hokuetsu Kishu Paper Co., Ltd.Inventors: Toshihiko Soyama, Junji Nemoto, Hisashi Hamabe
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Patent number: 8845091Abstract: A printing medium including at least base paper and a coating layer, wherein the coating layer is directly formed on the base paper by a cast coating method using a coating liquid, which contains kaolin and amorphous silica and contains the amorphous silica in an amount of 3% by mass to 20% by mass.Type: GrantFiled: March 17, 2010Date of Patent: September 30, 2014Assignees: Ricoh Company, Ltd., Hokuetsu Kishu Paper Co., Ltd.Inventors: Tohru Ohshima, Michihiko Namba, Kiyofumi Nagai, Atsushi Hasegawa, Shuichi Oguma, Hisanori Sakatsume
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Publication number: 20120031063Abstract: An object of the present invention is to improve a problem of the decrease in the internal tearing strength and water repellency in accordance with the decrease in the basis weight of a filter medium for air filters, and to provide a filter medium for air filters that can also address a demand for flame retardancy. The low-basis-weight filter medium for air filters according to the present invention is characterized by glass short fibers (A) and short fibers of hydrophobic chemical synthetic fibers each having a fiber diameter of 5 ?m or less (B), as raw material fibers of the filter medium, by a mass ratio (A/B) in the range of from 70/30 to 95/5; a hydrophobic synthetic resin-based binder is added to the filter medium by 3 to 10 parts by mass of with respect to 100 parts by mass of the raw material fibers; and the filter medium has a basis weight of from 25 g/m2 or more to 50 g/m2 or less.Type: ApplicationFiled: April 20, 2010Publication date: February 9, 2012Applicant: HOKUETSU KISHU PAPER CO., LTD.Inventors: Toshihiko Soyama, Masachi Sato
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Publication number: 20110283671Abstract: The objective of the present invention is to provide an air filter medium having a lower pressure drop and higher efficiency as compared to an air filter medium currently in use. This objective is achieved by providing an air filter medium characterized by comprising glass short fibers as its main fibers in which the constituent fibers are dispersed uniformly and, when the constituting fibers at a diluted concentration of 0.04% by mass are allowed to stand for 12 hours, the sedimentation volume is 450 cm3/g or greater.Type: ApplicationFiled: May 6, 2011Publication date: November 24, 2011Applicant: HOKUETSU KISHU PAPER CO., LTD.Inventors: Toshihiko SOYAMA, Hiroshi KUWANO