| 摘要 |
PURPOSE:To improve the injection moldability of frame members markedly and to prevent the failure in melt sticking and the slackening of filter members by molding the frames of the same material as that of filters into separate bodies, and forming the same into one body by ultrasonic welding. CONSTITUTION:A filter member 5 which is molded of a PP resin or the like into the form of yarn and is woven to a corrugating shape and a frame member 6 which consists of the same material as that of the filter member and has a mol.wt. lower than the mol. weight of the filter member are molded into separate bodies. The member 6 is set to a horn receiver 8 in such a way that the opposite surface of the member 6 provided with ribs 6a contacts the receiver 8. After the member 5 is pinned 6a tentatively thereto, ultrasonic waves are applied to the members by means of a horn 7 for melt sticking, then the ribs 6b of the member 6 having a lower mol.wt. melt first by the friction of the joined surfaces then the member 5 melts to be joined in one body to the member 6. |
