Facemask seal
An improved sealing element for a facemask and facemasks which include the sealing element are provided. The sealing element may be formed of a flexible material having a durometer value of 60 or less on a Type 000 scale, and the sealing element may have at least three primary external faces including a) a facemask attachment face; b) a skin contact face; and c) a third face. When viewed in cross-section, the skin contact face is the longest of the three faces, and the sealing element is formed into a triangular or trapezoidal cross-sectional configuration during manufacturing. Also when viewed in cross section, the side corresponding to the third face may have a length which is less than 90% of the length of the skin contact face.
1. A facemask comprising:
a) a housing defining a facemask chamber, the housing comprising a continuous attachment flange configured to surround either:
a nose of a user;
a mouth and the nose of the user; or
the mouth, the nose, and eyes of the user; and
b) a sealing element attached to the housing, the sealing element configured to form a seal between the housing and a face of the user, the sealing element comprised of a formed flexible material having a durometer value of 60 or less on a Type 000 scale, the sealing element being substantially triangular in cross-section and having three primary faces comprising:
i) a facemask attachment face;
ii) a skin contact face; and
iii) a third face;
wherein the continuous attachment flange comprises an attachment surface, the facemask attachment face is in contact with the attachment surface, and the third face extends from a plane defined by the attachment surface;
wherein, when the sealing element is viewed in cross-section, the skin contact face is a longest of the three primary faces; and
wherein, when the sealing element is viewed in cross section, the third face has a length which is less than 90% of a length of the skin contact face, and wherein an entirety of the third face is configured to form a portion of the facemask chamber when the facemask is worn by the user.
2. The facemask of claim 1 , wherein the continuous attachment flange slopes inwardly along at least a majority of its length.
3. The facemask of claim 1 , wherein the formed flexible material comprises a sealed, flexible external membrane bladder containing a fluid or a gel.
4. The facemask of claim 3 , wherein the sealed, flexible external membrane bladder is formed from a thermopolymer and the gel is a silicone gel.
5. The facemask of claim 4 , wherein the sealed, flexible external membrane bladder is formed by bonding a first thermopolymer sheet portion and a second thermopolymer sheet portion.
6. The facemask of claim 5 , wherein the first thermopolymer sheet portion is drawn under heat and vacuum to form the skin contact face and the third face.
7. The facemask of claim 6 , wherein, when the sealed, flexible external membrane bladder is viewed in cross section, the third face has a length which is less than 70% of the length of the skin contact face.
8. The facemask of claim 1 , wherein the sealing element further comprises one or more local lobe domains having an extended skin contact face and an extended third face, relative to adjacent non-lobe domains, for sealing areas of substantial variation in the face of the user.
9. The facemask of claim 1 , wherein a majority of a surface of the continuous attachment flange slopes inwardly at least 5 degrees.
10. The facemask of claim 1 , wherein a majority of a surface of the continuous attachment flange slopes inwardly from about 15 degree to about 30 degrees.
11. The facemask of claim 1 , wherein an angle formed between the facemask attachment face and the third face is between 70 degrees and 90 degrees.
12. The facemask of claim 1 , wherein the sealing element is adhesively attached to the housing.