| 摘要 |
A hopper (30) holds a metal and flux powder (24). A filler tube (28) conveys the powder from the hopper. Compressed gas (36) is injected into the powder to fluidize and convey the powder through the filler tube. The hopper may be vibrated (34) to prevent clumping. A gas permeable envelope (29) surrounds the filler tube and is filled with powder as it moves off the end of the filler tube. The gas escapes from the permeable envelope. Feed mechanisms (54, 56, 66, 74) may feed gas permeable sheets (55, 57) over opposite sides of the filler tube. A seaming device (58A-B, 78A-B) may seam the sheets along their edges to form the gas permeable envelope surrounding the filler tube. Closing (40) and cutting (42) machines close and cut the envelope, forming a packet (22) containing the powder. |
