During the processing and installation of wooden fire doors, there may be gaps between the frame material of the door leaf, between the frame material and the filling material, between the frame material and the wrapping strip, and between the door leaf and the door frame. When the fire door is tested, the furnace chamber is under positive pressure. If there is a gap from the fire-facing surface to the fire-back surface in the wooden fire door, high-temperature gas or flame will be rapidly transmitted along the gap, the wood around the gap will be charred and burned, and the gap will expand, which will eventually lead to flames or flames on the fire-back surface of the fire door. The cotton pad is ignited, or the single-point temperature on the back side reaches 180°C plus room temperature. Therefore, the protective treatment of the gap has an important influence on the fire resistance of the fire door.
High-temperature glue must be applied between the frame material of the wooden fire door leaf, between the frame material and the filling material, and between the frame material and the wrapping strip, and between the door leaf and the door frame, inflatable fireproof sealing strips must be used. Domestic companies usually apply high-temperature glue between the frame materials of the door leaf, between the frame material and the filling material, between the frame material and the wrapping strip, and apply the fire-resistant coating or use intumescent fire-resistant paint between the door leaf and the door frame during product type certification. sealing strip. However, because the application of high-temperature glue or the use of intumescent fireproof sealing strips has a greater impact on production efficiency and increases production costs, some companies omit this process in actual production.
