Claims
- 1. A water purification device comprising:
- (a) a closed container, wherein at least one functional surface of said container is a porous to water non-woven fabric wherein said fabric has a weight of about 150 to 650 grains/yd.sup.2, a porosity of at about 100 cfm/ft.sup.2 to about 800 cfm/ft.sup.2, a dry machine direction grab tensile strength of at least 3 pounds/linear inch, a dry cross direction grab tensile strength of at least 2 pounds/linear inch, a wet machine direction grab tensile strength of at least 1 pound/linear inch, and a wet cross direction grab tensile strength of at least 0.75 pounds/linear inch;
- (b) an amount, sufficient to treat said water of granular activated carbon contained in said container; and
- (c) an ingredient that will inhibit the migration of fine particles of said carbon through said fabric when said device is immersed in water, wherein said ingredient is compatible to the particle size distribution of said carbon and is dispersed therein, in an amount sufficient to inhibit the migration of fine particles of said carbon through said porous fabric when said device is immersed in water and wherein said ingredient will not normally adversely affect the palatability of said water
- wherein said ingredient is selected from the group consisting of:
- (a) a pregelatinized, pH modified epichlorohydrin cross-linked tapioca starch having a gross swelling power of about 16 measured after thirty minutes, a pH of about 6, and a predominant mesh size of about 20 to 100 mesh,
- (b) a pH modified, epichlorohydrin cross-linked corn starch having a gross swelling power of about 13 measured after forty-five minutes, a pH of about 6, and a predominant mesh size of about 12 to 100 mesh,
- (c) a substantially pure aluminum lanolate soap in the form of free-flowing particles having a predominant mesh size of about 40 mesh, and
- (d) combinations thereof.
- 2. A device according to claim 1 wherein said device is a bag wherein said bag has at least one compartment and is substantially constructed from said porous non-woven fabric.
- 3. A device according to claim 2 further comprising an appendage extending from said container to facilitate the suspension of said device in, and retrieval of said device from said water.
- 4. A device according to claim 1 wherein said device is in the form of a teabag wherein said bag contains a volume of about 0.5 to 1.5 cubic inches, wherein said fabric has
- (a) a weight of at least 500 grains/yd.sup.2,
- (b) a dry machine direction grab tensile strength of at least about 10 pounds/linear inch,
- (c) a dry cross direction grab tensile strength of at least about 6.5 pounds/linear inch,
- (d) a wet machine direction grab tensile strength of at least about 3 pounds/linear inch, and
- (e) a wet cross direction grab tensile strength of at least about 2 pounds/linear inch.
- 5. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 5 percent of said particles larger than about 4 mesh and no more than about 5 percent of said particles smaller than about 12 mesh,
- (b) said ingredient is a pH modified, epichlorohydrin cross-linked corn starch having a gross swelling power of about 13 measured after forty-five minutes, a pH of about 6, and a predominant mesh size of about 12 to 100 mesh and,
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least about 1:2 starch to carbon.
- 6. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 5 percent of said particles larger than about 8 mesh and no more than about 5 percent of said particles smaller than about 20 mesh,
- (b) said ingredient is a pH modified, epichlorohydrin cross-linked corn starch having a gross swelling power of about 13 measured after forty-five minutes, a pH of about 6, and a predominant mesh size of about 12 to 100 mesh, and
- (c) said ingredient is present in a mixture with said carbon is a weight ratio of at least about 1:2 starch to carbon.
- 7. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 10 percent of said particles larger than about 20 mesh and no more than about 3 percent of said particles smaller than about 50 mesh,
- (b) said ingredient is a pH modified, epichlorohydrin cross-linked corn starch having a gross swelling power of about 13 measured after forty-five minutes, a pH of about 6, and a predominant mesh size of about 12 to 100 mesh, and
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least about 1:2 starch to carbon.
- 8. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 10 percent of said particles larger than 20 mesh and no more than about 3 percent of said particles smaller than about 50 mesh,
- (b) said ingredient is a pregelatinizied, pH modified, epichlorohydrin cross-linked tapioca starch having a gross swelling power of about 16 measured after thirty minutes, a pH of about 6 and a predominant mesh size of about 20 to 100 mesh, and
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least 1:3 starch to carbon.
- 9. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 5 percent of said particles larger than 4 mesh and no more than 5 percent of said particles smaller than about 12 mesh,
- (b) said ingredient is a pregelatinized pH modified, epichlorohydrin cross-linked tapioca starch having a gross swelling of about 16 measured after thirty minutes, a pH of about 6 and a predominant mesh size of about 20 to 100 mesh, and
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least 1:2 starch to carbon.
- 10. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 5 percent of said particles larger than 12 mesh and no more than 5 percent of said particles smaller than about 20 mesh,
- (b) said ingredient is a pregelatinized, pH modified, epichlorohydrin cross-linked tapioca starch having a gross swelling power of about 16 measured after thirty minutes, a pH of about 6 and a predominant mesh size of about 20 to 100 mesh, and
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least 1:2 starch to carbon.
- 11. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 5 percent of said particles larger than 12 mesh and no more than 5 percent of said particles smaller than about 40 mesh,
- (b) said ingredient is a pregelatinized pH modified, epichlorohydrin cross-linked tapioca starch having a gross swelling of about 16 measured after thirty minutes, a pH of about 6 and a predominant mesh size of about 20 to 100 mesh, and
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least 1:2 starch to carbon.
- 12. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 10 percent of said particles larger than 14 mesh and no more than 10 percent of said particles smaller than about 60 mesh,
- (b) said ingredient is a pregelatinized pH modified, epichlorohydrin cross-linked tapioca starch having a gross swelling of about 16 measured after thirty minutes, a pH of about 6 and a predominant mesh size of about 20 to 100 mesh, and
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least 1:1 starch to carbon.
- 13. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle size distribution having no more than about 5 percent of said particles larger than 20 mesh and no more than 5 percent of said particles smaller than about 40 mesh,
- (b) said ingredient is a pregelatinzied pH modified, epichlorohydrin cross-linked tapioca starch having a gross swelling of about 16 measured after thirty minutes, a pH of about 6 and a predominant mesh size of about 20 to 100 mesh, and
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least 1:2 starch to carbon.
- 14. A device according to claim 4 wherein,
- (a) said granular activated carbon has a particle
- size distribution having: i) no more than about 10 percent of said particles larger than 8 mesh and no more than 10 percent of said particles smaller than 20 mesh,
- (b) said ingredient is wood flour, and
- (c) said ingredient is present in a mixture with said carbon in a weight ratio of at least 1:3 wood flour to carbon.
- 15. A method of treating drinking water to remove impurities therefrom comprising immersing the device of claim 1 in said water for a period of time sufficient to remove said impurities.
- 16. A method of treating drinking water to remove impurities therefrom comprising immersing the device of claim 2 in said water for a period of time sufficient to remove said impurities.
- 17. A method of treating drinking water to remove impurities therefrom comprising immersing the device of claim 7 in said water for a period of time sufficient to remove said impurities.
- 18. A device for removing certain impurities from water comprising:
- (a) a closed container, wherein at least one functional surface of said container is a porous to water non-woven fabric wherein said fabric has a weight of about 500 grains/yd.sup.2 a porosity of at about 100 cfm/ft.sup.2 to about 800 cfm/ft.sup.2 a dry machine direction grab tensile strength of about 10.6 pounds/linear inch, a dry cross direction grab tensile strength of at least 2 pounds/linear inch, a wet machine direction grab tensile strength of about 3.5 pounds/linear inch, and a wet cross direction grab tensile strength of at least 0.75 pounds/linear inch;
- (b) an amount, sufficient to treat said water of an activated carbon contained in said container, wherein said carbon is characterized by a screen size range of about
- ______________________________________ on 20 mesh 10 percentthrough 20 mesh on 30 mesh 25 to 65 percentthrough 30 mesh on 40 mesh 20 to 40 percentthrough 40 mesh on 50 mesh 5 to 20 percentthrough 50 mesh 3 percent maximum______________________________________
- a Phenol Number of about 135 mg/g dry carbon, an Iodine Number of about 900 mg/g carbon, and an apparent density of about 0.50 to 0.55 grams per ml; and
- (c) a pregelatinized pH modified epichlorohydrin cross-linked tapioca starch having a gross swelling power of about 16 (measured after 30 minutes), a pH of about 6 and a predominant mesh size of about 20 to 100 mesh dispersed therein, in an amount sufficient to inhibit the migration of fine particles of said agent through said porous paper when said device is immersed in water.
- 19. A method of treating drinking water to remove impurities therefrom comprising immersing the device of claim 17 in said water for a period of time sufficient to remove said impurities.
Parent Case Info
This application is a Continuation-In-Part application of copending application Ser. No. 728,375, filed Sept. 30, 1976 Ser. No. 728,375 has issued as U.S. Pat. No. 4,039,444 on Aug. 2, 1977.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2362860 |
Jun 1975 |
DEX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
728375 |
Sep 1976 |
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