| 摘要 |
Heat-insulating door leaf, in particular for exterior doors, having cover plates which are externally arranged on both sides, are connected round the borders to form a casing and between which there is fixedly accommodated a heat-insulating filling which, in order to achieve better resistance to buckling with fully sufficient heat insulation and warp resistance, is configured such that the heat filling comprises a layered panel having interconnected layers whose two outer layers, in each case resting internally on one of the cover plates, are formed from honeycombed paperboard, or similar filling material which is suitable for interior doors, between which layers there is introduced at least one layer which protects against the cold, consisting of a material which can effect heat insulation to a high degree, for connecting the adjacent honeycombed-paperboard layers to form a sufficiently firm structure.
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