| 摘要 |
<p>This invention relates to centrefire sporting ammunition, for example a shotgun cartridge, comprising a cap shell [1] containing a quantity of impactsensitive priming material [2], an anvil [4] and a cap chamber [3] having one or more flash holes [6] therein, the or each flash hole [6] being closed by a layer [7] of material that is removable upon, and as a result of impact ignition of the priming material [2]. The or each layer [7] preferably comprises a particulate material, such as China clay, in a polymeric binder and the provision thereof renders the percussion caps less mass-explosible.
<??>Since the [or each] layer [7] is vapour-permeable, a charging process using water-wet priming material, upon which the assembled percussion cap can be subsequently dried, can be applied. </p> |
