| 摘要 |
<p>The present invention is an improved fire resistant door having timber frames and at least one leaf incorporating at least one composite panel. The frame comprises rails and stiles 24, 25, 36 made from hardwood. The inner edges of the rails and stiles have grooves to receive the outer edges of the panels. The composite panel comprises at least three layers. The exposed layer 26, 27, 30, 40 (facing the flame) and the unexposed layer 29 (facing away from the flame) comprise subpanels made from hardwood. Sandwiched between the exposed and unexposed layers is an intermediate layer 28 comprising either an insulation material or fire resistant material such as calcium silicate board. In the preferred embodiment of the present invention, a double doorset incorporating various three layer panels sustained fire integrity test for approximately an hour. <IMAGE></p> |
