| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simplified filtration device configured to achieve safe and quick brewing by preventing, in pouring hot water into the opening of a bag body which comprises a filter, the opening from sagging downward due to the weight of the previously placed material to be brewed, or due to the pressure or the weight of the hot water being poured. <P>SOLUTION: A bag body 2 comprises a water permeable filter forming an opening 7 between the upper edges by making front and rear two face sections 2a, 2b face. The filter is formed in a two-layer structure in which the inner surface side thereof has strong adhesion properties and the outer surface side thereof has weak adhesion properties. The upper edges which face the opening 7 are each folded inward, and the inner surfaces having the strong adhesion properties are firmly fusion bonded and joined together to form front and rear, reinforced edges 6, 6 to thereby secure the rigidity of the opening. Also, the outer surfaces of the front and rear, reinforced edges 6, 6 are adhered to each other in an easily peelable manner using the weak adhesion properties. The configuration makes it possible that, in opening the opening 7, the opening 7 can be easily unsealed utilizing the joint in the easily peelable state, and that the opening 7 can stand by itself because of the rigidity of the reinforced edges 6, 6 and can be maintained in the open state by preventing the sagging. <P>COPYRIGHT: (C)2012,JPO&INPIT |
