, the middle intermediate layer is polyurethane foam hear insulation materal , stick with the structural glue of high strength among every plate, mix with the aluminium alloy type materal and rivet into the whole. Installs the anti-low temperature heat insulation packing in the compartment and gate body between, the door lock organization uses the international theater box type vehicle stainless steel standard tool , the theater box board does not have the joint, the semblance brightly and cleanly, easy to clean, the anti-impact anti-corrosive. May according to the user demand specialized design random side gate, the different thickness theater box board, clamp does not separate the isothermia area, the different material quality and the color inside and outside compartment outer covering and so on