| 摘要 |
The apparatus forms fiberboard hollow ducts from fiberboard and comprises means for collapsing or partially collapsing the fiberboard into a flat collapsed fiberboard or partially collapsed fiberboard for advancing the collapsed or partially collapsed fiberboard through a preheating and heating stage while heat sensitive tape is applied to the linear seam of the advancing fiberboard. After tape is applied, means for applying pressure and cooling operate to permanently set the tape.
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