Bonded adsorbent structures and respirators incorporating same
First Claim
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1. A respirator comprising:
- a facepiece adapted for peripheral sealing contact with at least that portion of a human head which includes the nose and mouth;
associated fastening means for holding said respirator in position on the head; and
at least one porous filtering structure having a panel-like shape, mounted in the respirator across a path for air to be drawn or blown inwardly through the respirator, the filtering structure;
having two opposed large-area surfaces with dimensions larger than the structure'"'"'s thickness;
being a unified and impact-resistant structure;
said filtering structure comprising spaced individual adsorbent granules bonded to one another by uniformly distributed, adherent binder particles disposed between said granules wherein said binder particles were in a liquefied state during bonding of the structure, and at least 85 weight percent of the binder particles have diameters larger than 400 mesh.
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Abstract
Shaped porous filtering structures of substantially uniform thickness and density particularly suited for filtration of gases and vapors comprising spaced adsorbent granules unified into a solid, self-sustaining, unitary, impact-resistant body by adherent binder particles, respirators incorporating such structures as the gas and vapor filtration elements and methods for making the shaped porous filtering structures are disclosed.
83 Citations
19 Claims
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1. A respirator comprising:
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a facepiece adapted for peripheral sealing contact with at least that portion of a human head which includes the nose and mouth; associated fastening means for holding said respirator in position on the head; and at least one porous filtering structure having a panel-like shape, mounted in the respirator across a path for air to be drawn or blown inwardly through the respirator, the filtering structure; having two opposed large-area surfaces with dimensions larger than the structure'"'"'s thickness; being a unified and impact-resistant structure; said filtering structure comprising spaced individual adsorbent granules bonded to one another by uniformly distributed, adherent binder particles disposed between said granules wherein said binder particles were in a liquefied state during bonding of the structure, and at least 85 weight percent of the binder particles have diameters larger than 400 mesh. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18)
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16. A respirator of claim wherein the porous filtering structure has an adsorbent density of from 80 percent to 110 percent of an equivalent loose packed bed as determined by ASTM D-2854-70.
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19. In combination, a powered air-purifying respirator and at least one porous filtering structure having a panel-like shape adapted to be mounted across a path for air to enter the respirator, the filtering structure;
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having two opposed large-area surfaces with dimensions larger than the structure'"'"'s thickness; being a unified and impact resistant structure; said filtering structure comprising spaced individual adsorbent granules bonded to one another by uniformly distributed, adherent binder particles disposed between said granules wherein said binder particles were in a liquefied state during bonding of the structure, and at least 85 weight percent of the binder particles have diameters larger than 400 mesh.
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Specification