| 摘要 |
An anvil for use in ultrasonic apparatus for welding two thermoplastic sheets where an ultrasonic vibration transmitter is provided having a working surface in contact with one side of one of the sheetlike materials and located in cooperative relation with opposed spaced anvil surfaces located on the opposite side of the sheetlike elements opposite the transmitter for producing welds in the material therebetween and where the anvils are elongate, hollow, and have a slit extending longitudinally thereof.
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