Regardless of the type of dryer chosen, special attention should be paid to its sealing performance. The durability of the door switch and the quality of the sealing rubber ring are closely related to the sealing performance of the door cover, while good sealing performance is beneficial for shortening the drying time; When choosing, attention should be paid to whether the door cover is tightly closed, whether the sealing ring is flat, whether it is too soft or too hard, whether there are any cracks or stickiness, and how its heat resistance is.