METHOD FOR MANUFACTURING DOOR FOR CHANGING OVER VENTILATION PASSAGE

摘要

PROBLEM TO BE SOLVED: To suppress the deformation of a seal material caused by internal contraction force in a door for changing over a venting passage wherein a thin flat plate-shaped seal material comprising an elastomer is fixed to the outer peripheral edge part of a door main body part. SOLUTION: In a method for manufacturing a door for changing over a ventilation passage wherein the seal part length of a seal material 102 extending along the outer peripheral edge part of a door main body part 100 is 100 mm or more on the single side in the diameter direction of a rotary shaft 10 and the thickness of the seal material 102 is 2.0 mm or less, a plurality of injection gates 32 are set to inject a molten material of an elastomer constituting the seal material 102 in the mold space of a mold to mold the same and the flow length of the molten material is set to 40 mm or less.