| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate unsealing by tearing, by forming a notched part in the welded part in the bottom of the sheet of a bag-like body made of a flexible synthetic resin and forming a groove part for tearing by a laser from the part near to the middle body part or upper part of the bag-like body. SOLUTION: The blood bag 1 is formed by superposing two sheets of sheet- like polyvinyl chlorides and welding the outer peripheries thereof by a high-frequency welder. The notched part 7 is formed in the welded part 4 in the bottom of the bag-like body 2. The groove part 3 is formed up to the position upper than the middle body part of the bag-like body 2 with the notched part 7 as a start point (a) by irradiation with the laser by a laser marker. In such a case, the bag-like body 2 is irradiated with the laser in the contactless state from the blood bag 1 and, therefore, the groove part 3 is formable at a uniform depth without being affected by the undulations of the welded part 4 of the sheets. As a result, the easy unsealing by uniform tearing upward from the start point (a) of the notched part 7 is made possible.</p> |
