| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a gas sealing sheet which automatically opens an air valve. <P>SOLUTION: The gas sealing sheet automatically opening an air valve is made by coating a heat-resisting material to a predetermined zone between two internal films in advance, superposing and the two internal films between two external films and welding the films by a heat sealing means to form an air injection channel and a plurality of air columns, heat-sealing the site of the internal film coated with the heat-resisting material to form an air inlet, and welding a side area of the air inlet by the heat sealing means to form a plurality of heat-sealing zones. When air is filled up, the external film of the air injection channel is stretched toward the outside and opened in the longitudinal direction, the air injection channel is shrunk in a lateral direction at a difference based on formation of the heat-sealing zone, the plurality of heat-sealing zones push the internal film to pull and open outside in the longitudinal direction, the air inlet is opened, and after an air enters the air column, the internal film is pressed to block an air column. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
