Mask with translucent flap

A mask with a translucent flap, comprising:

• a mask body for covering a mouth and a nose of a user, the mask body having an opening portion;
• an elastic band being connected to the cover body;
• and
• an air valve being connected to the opening portion, so that the opening portion forms a closed state, the air valve comprising:
• a valve seat includes a surrounding wall portion forming a target profile, an inner window portion, and a fixing portion. The inner window portion and the fixing portion are connected at an inner side of the surrounding wall portion;
• a translucent flap being assembled on the fixing portion to cover the inner window portion, and the translucent flap having a target shape matching the target profile;
• and
• a valve cover detachably connected to the valve seat, and an accommodating space is formed between the valve seat and the valve cover, the valve cover has a shielding portion for overlapping an upper half region of the inner window portion and an outer window portion for overlapping a lower half region of the inner window portion, and the shielding portion extends a pressing member towards the translucent flap;
• wherein a pressed end of the translucent flap being clamped by the pressing member and the fixing portion, and a free end of the translucent flap is capable of being pushed by a breathing airflow to change the closed state of the opening portion to an open state;
• wherein the translucent flap comprises a first thermoplastic plastic layer and a second thermoplastic plastic layer in contact with the inner window portion, the first thermoplastic plastic layer has a first surface roughness and a first elasticity, the second thermoplastic plastic layer has a second surface roughness greater than the first surface roughness and a second elasticity greater than the first elasticity;
• and the first thermoplastic plastic is polyethylene terephthalate, and the second thermoplastic plastic is thermoplastic polyurethane.