A venting device for a drum. The venting device includes a body having a pair of opposing sides and defining a plurality of vent passages. The vent passages extend through the body and each an opening at each of the pair of opposing sides. The vent passages are spaced apart and arranged around a center portion of the body. A membrane structure is positioned so as to cover the openings of the vent passages on one of the pair of opposing sides of the body. The membrane structure is sealingly affixed to the body portion in a sealing band surrounding the openings of the vent passages. A portion of the membrane structure is further affixed to the center portion of the body. A protective structure may be attached to the body and positioned over the membrane structure.
1. A venting device adapted to be sealingly received in an opening of a drum, the device comprising:
a body having a pair of opposing sides and defining a plurality of vent passages, each vent passage having an opening at each of the pair of opposing sides and extending through the body, the vent passages being spaced apart and arranged around a center portion of the body;
a membrane structure covering the openings of the vent passages on one of the pair of opposing sides of the body, the membrane structure being sealingly affixed to the body portion in a sealing band surrounding the openings of the vent passages, a portion of the membrane structure being further affixed to the center portion of the body at a spot, thereby defining a portion of the membrane structure between the sealing band and the spot, the membrane structure not being attached to the body in the portion defined between the sealing band and the spot; and
a protective structure attached to the body and positioned over the membrane structure.
2. The venting device of claim 1 , wherein the membrane structure includes a membrane layer and a backing layer.
3. The venting device of claim 2 , wherein the membrane layer comprises a fluoropolymer material.
4. The venting device of claim 3 , wherein the fluoropolymer material is PTFE.
5. The venting device of claim 2 , wherein the membrane layer has a thickness of about 0.002 inch.
6. The venting device of claim 1 , wherein the protective structure is spaced apart from the membrane structure by at least about 0.050 inch.
7. A drum for containing a liquid, comprising:
a bottom structure, a top structure, and a wall together defining an enclosure, the enclosure having at least one bunghole defined therein; and
a closure sealingly engaged in the at least one bunghole, the closure including a body portion having a pair of opposing sides and defining a plurality of vent passages, each vent passage having an opening at each of the pair of opposing sides and extending through the body, the vent passages being spaced apart and arranged around a center portion of the body, the closure further including a membrane structure covering the openings of the vent passages on one of the pair of opposing sides of the body, the membrane structure being sealingly affixed to the body portion in a sealing band surrounding the openings of the vent passages, a portion of the membrane structure being further affixed to the center portion of the body at a spot, thereby defining a portion of the membrane structure between the sealing band and the spot, the membrane structure not being attached to the body in the portion defined between the sealing band and the spot.
8. The drum of claim 7 , wherein the wall is generally cylindrical.
9. The drum of claim 7 , further comprising a protective structure attached to the body and positioned over the membrane structure.
10. The drum of claim 9 , wherein the protective structure is spaced apart from the membrane structure by at least about 0.050 inch.
11. The drum of claim 7 , wherein the membrane structure includes a membrane layer and a backing layer.
12. The drum of claim 11 , wherein the membrane layer comprises a fluoropolymer material.
13. The drum of claim 12 , wherein the fluoropolymer material is PTFE.
14. The drum of claim 10 , wherein the membrane layer has a thickness of about 0.002 inch.
15. A venting device adapted to be sealingly received in an opening of a drum, the: device comprising:
a body having a pair of opposing sides and defining a plurality of vent passages, each vent passage having an opening at each of the pair of opposing sides and extending through the body, the vent passages being spaced apart and arranged around a center portion of the body;
membrane means covering the openings of the vent passages on one of the pair of opposing sides of the body, the membrane means being sealingly affixed to the body portion in a sealing band surrounding the openings of the vent passages, a portion of the membrane structure being further affixed to the center portion of the body at a spot, thereby defining a portion of the membrane means between the sealing band and the spot, the membrane means not being attached to the body in the portion defined between the sealing band and the spot; and
protective means attached to the body and positioned over the membrane structure.
16. The venting device of claim 15 , wherein the membrane means comprises a membrane structure including a membrane layer and a backing layer.
17. The venting device of claim 16 , wherein the membrane layer comprises a fluoropolymer material.
18. The venting device of claim 17 , wherein the fluoropolymer material is PTFE.
19. The venting device of claim 16 , wherein the membrane layer has a thickness of about 0.002 inch.
20. The venting device of claim 15 , wherein the protective means is spaced apart from the membrane structure by at least about 0.050 inch.