(Window frame, sash) After welding and cleaning the corner, the door and window sealing strip should be pushed in the profile groove with a special roller in the correct direction, and the triangle cap of the strip should be pressed down into the profile groove. until. Because the rubber strip is an elastomer, it may shrink after being rolled. The correct method should be to retract the two ends of the rubber strip toward the middle when the door and window sealing strip is installed at the two-end interface, and leave 2— 3 cm of shrinkage margin, then cut and embed.