| 摘要 |
An explosive or stemming package is provided which is self-retaining in vertical or inclined up-holes in stable rock. The package containing a flowable material, for example, slurry explosives, consists of a thin-walled cylindrical bag having at least one longitudinal, external pleat held closed by means of an adhered overcovering or tape. With the package held in position in the up-hole by a push rod, the tape is severed by means of a rip cord allowing the pleat to open. The slumping contents press the package closely against the borehole wall for secure retention without additional support. Improved coupling of the explosive charge to the rock is also provided giving enhanced blasting efficiency.
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