Packaging bag with self-closing nozzle and its manufacturing method

Patent name Packaging bag with self-closing nozzle and its manufacturing method Patent applicant Toyo Can Co., Ltd. Principal applicant Address Inawasawa, Japan Inventor Kurosawa Kazuya; Matsuda Satoshi; Kunihiro Ichiro Application (patent) No. 02829938.8 Application Date 2002.11.22 Certification Date Approval Notice No. 1694834 Date of Publication of the Notice 2005.11.09 Specification CD-ROM D0545 Main Classification Number B65D33/36 Classification Number B65D33/36; B31B1/84; B31B25/26 Sub-file Original Application No. A packaging bag made by heat-sealing a plastic film and having a nozzle (3) formed of a heat-sealing portion (2) and a non-heat-sealing portion (6), and a method of manufacturing the same. The inner surface of the film on the non-heat-sealable portion (6) side of the boundary portion (Y) between the heat-sealed portion (2) and the non-heat-sealed portion (6) of the sprue channel (4) is in contact with each other and in the closed state There is no gap, thereby preventing the contents from leaking from the spout (3); the method includes the steps of conveying for forming in the packaging bag in accordance with the conveyance of the sheet-like body material (101, 102) forming the packaging bag. Rear limit filler The moving valve material (103) can be continuously manufactured by heat-melting the body materials (101, 102) onto the valve material (103) in a state where the seal preventing member (106) is disposed on the passing side of the filler material. A bag with a valve function such as a backflow prevention function. Sovereignty item 1. A packaging bag (1, 131a, 31b, P1 to P5) heat-sealed by heat-sealing a plastic film, characterized in that it comprises: a self-closing nozzle (3, 133, 141). 141), wherein the portion of the boundary area (Y) between the heat-sealed portion (2) and the non-heat-sealed portion (6) of the nozzle channel (4) on the side of the non-heat-sealed portion (6) is formed The inner surfaces of the film are in contact with each other in a closed state without gaps; and a dosing chamber (137, 148, 148) which communicates with the self-closeable nozzle (3, 133, 141, 141). International Application 2002-11-22 PCT/JP2002/012243 International Publications 2004-06-10 WO2004/048217 Date of Entry into the Country Patent Agencies Beijing King & Wood Law Office Location Agent Yi Yimei