| 摘要 |
<p>A grid composite for protecting men and longwall mining equipment (68) during longwall shield recovery includes a regular polymer geogrid structure (40) formed by biaxially drawing a continuous sheet of select polypropylene material which is heat bonded to a polyester fabric (46). The grid composite is secured over caving shields (66) of longwall mining equipment (68) during a longwall mining operation.</p> |
