| 摘要 |
1,258,929. Seaming non-metallic sheet material. DART INDUSTRIES Inc. 13 Dec., 1968 [20 Dec., 1967], No. 19096/71. Divided out of 1,258,928. Heading B5K. A closure 13 of injection moulded thermoplastic material having a peripheral protuberance 27 thereon is joined by ultrasonic welding to a hollow body 10 of injection moulded thermoplastic material having an undercut annular groove 33 on an inside wall of an outwardly flared peripheral edge portion 31 thereof, the protuberance 27 being of such shape and dimension so as, upon ultrasonic heating thereof, to flow into the groove 33. Preferably, the groove 33 is shaped as shown in Fig. 7. The closure 13 may form the bottom of a dispenser for condiments or particulate materials.
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