Company production airtight insulation door open MiBiMen using flat, and its structure for steel structure of oppression. Frame, the industry of cold bending skeleton on an empty stomach meet and become. With industry GB228-87 standard requirement, panel of 0.6 mm choi, inside the board for galvanized sheet or color plate, the special molding pressure trough panel, inner chamber filling polystyrene from extinguish foam board. Framework, filling materials, panel after composite, compression, pull riveting to shape. Article seal ring set in skeleton around, with layering pull rivets fixed. Divided into "J" type strip and "b" type two kinds, "b" type rubber strip doors 60 * choose 60 Angle steel, and the material of the accord with GB9789-88 standard, "J" type rubber strip choose reefer containers special sealing strip, flexibility, high strength and durability strong, glue accord with GB7526-87 standard requirement, sealing ring set in skeleton article around, with layering pull rivets fixed. Heat preservation doors lock made a pole, "J" strip door, hand in closing wind through the handle, the side that seal to the article in doorcase surface, the other side plug unparalleled in between, the special, under the locking device and locks fixed, lock for special steel casting. I company production airtight insulation door, has reliable sealing heat preservation sex and open flexible characteristics.