| 摘要 |
A composite door 10 has a sub-frame 12 manufactured from lengths of extruded aluminium and side panels 14 mounted to either side of the frame to form the face details of the door. The door comprises means 48 (58, Figure 9) for reducing the thermal conductivity across the extruded aluminium components of the sub-frame from one side of sub-frame to the other. The components of the sub-frame may be hollow and the means for reducing the thermal conductivity across the components may include filling them with a material 48 having a lower thermal conductivity than aluminium. The material 48 may be expanded polyurethane foam. In addition or as an alternative, the sub-frame components may include regions (58, Figure 9) of a material having a lower thermal conductivity than aluminium which act as a thermal break. |
