| 摘要 |
Methods, devices and apparatus are disclosed for forming one or more wells in a sheet of deformable material. The device comprises an element comprising a tip adapted for reducing forces on an extruding material and/or preventing resistance to stretch and an outer surface that is at least partially textured and a maximum outside diameter that is less than the diameter of the wells to be formed by at least the thickness of the sheet. In one aspect, the tip is radiused and/or polished. In another aspect, the at least partially textured outer surface is at least adjacent to the radiused tip. The element may be wholly or partially hollow. Apparatus include one or more of the aforementioned devices and a moving mechanism for moving the devices in position for forming one or more wells in a sheet of deformable material.
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