Honeycomb composite plate of plastic foam

A composite plate comprising:

• a plastic foam support core having a honeycomb structure with honeycomb cells, the plastic foam support core comprising a support plate and walls extending from the support plate defining the honeycomb cells, the support plate and the walls of the honeycomb cells being made by a single step mould pressing and foaming to form a single-piece, unitary structure;
• a plastic surface sheet covering an upper side of the plastic foam support core, the plastic surface sheet fastened to the plastic foam support core;
• and
• a plastic base sheet supporting a lower side of the plastic foam support core, wherein
• the honeycomb cells of the support core are blind slots,
• the plastic surface sheet extends downwards at an edge of the plastic foam support core,
• the plastic base sheet extends upwards at the edge of the plastic foam support core, and
• the plastic surface sheet and the plastic base sheet overlap to form an edge of the composite plate.