Humidity control insert for cigarette packs

1. A humidity control insert for a package, comprising a porous nonwoven fibrous substrate and a hygroscopic powder material dispersed within the porous nonwoven fibrous substrate,

wherein the humidity control insert is obtained by dispersing the hygroscopic powder material into the porous nonwoven fibrous substrate by a dry powder impregnation process; heating and compacting the porous nonwoven fibrous substrate to immobilize the hygroscopic powder material; and retaining moisture into the porous nonwoven fibrous substrate dispersed with the hygroscopic powder material, and

wherein the hygroscopic powder material accounts for 1-50. wt. % of the dry weight of humidity control insert.

2. The humidity control insert of claim 1 , wherein the hygroscopic powder material is dispersed into the porous nonwoven fibrous substrate by a dry powder impregnation process using an alternating electric field.

3. The humidity control insert of claim 1 , wherein the porous nonwoven fibrous substrate comprises at least one polymer selected from the group consisting of polyethylene, polystyrene, polyvinylchloride, cellophane, polycarbonate, polyester, polyamides, polyurethane, ethylcellulose, cellulose acetate, polybutylene, polypropylene, polyethylene terephthalate, polyvinylidene chloride, polyvinyl fluoride, polyvinyl alcohol, polyvinylidene fluoride and copolymers thereof.

4. The humidity control insert of claim 1 , wherein the porous nonwoven fibrous substrate comprises at least one polymer selected from the group consisting of high density polyethylene, oriented polystyrene, microporous polyethylene, microfiberous polyethylene and polyvinylchloride.

5. The humidity control insert of claim 1 , wherein the hygroscopic powder material comprises at least one salt, sugar, sugar alcohol, and/or polybasic acid, which is adapted to create a desired relative humidity in an air space adjacent to the humidity control insert.

6. The humidity control insert of claim 1 , wherein the porous nonwoven fibrous substrate comprises at least one polymer selected from the group consisting of polyglycolic acid, polylactic acid, polyhydroxypropionate, polyhydroxyvalerate, polyhydroxybutyrate, polyhydroxyhexanoate, polyhydroxyoctanoate, polycaprolactone, polybutylene succinate, polybutylene succinate adipate, and copolymers thereof).

7. The humidity control insert of claim 1 , wherein the hygroscopic powder material comprises at least one salt selected from the group consisting of sodium salts, potassium salts, magnesium salts, calcium salts, ammonium salts, and lithium salts.

8. The humidity control insert of claim 1 , wherein the hygroscopic powder material comprises at least one salt selected from the group consisting of sodium nitrite, sodium nitrate, sodium chloride, sodium bromide, sodium iodide, potassium nitrite, potassium nitrate, potassium chloride, potassium bromide, potassium iodide, potassium citrate, potassium sulfate, potassium carbonate, potassium hydroxide, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium carbonate, and calcium chloride.

9. The humidity control insert of claim 1 , wherein the hygroscopic powder material at least one sugar, sugar alcohol, and/or polybasic acid selected from the group consisting of sucrose, fructose, glucose, galactose, sorbitol, xylitol, mannitol, citric acid or salts thereof, maleic acid or salts thereof, malic acid or salts thereof, and succinic acid or salts thereof.

10. The humidity control insert of claim 1 , wherein the porous nonwoven fibrous substrate accounts for 50-99 wt. % of the dry weight of the humidity control insert.

11. The humidity control insert of claim 1 , wherein at least one side of the humidity control insert is laminated with a paper or film comprising printed information.

12. A package, comprising

a package body; and

the humidity control insert of claim 1 , the humidity control insert adapted to release

moisture retained therein into an internal air space of the package.

13. The package of claim 12 , wherein the humidity control insert provides a relative humidity of 10-90% in the internal air space of the package.

14. The package of claim 12 , wherein the package body defines the internal air space, and wherein the humidity control insert is separate from the package body.

15. The package of claim 12 , wherein the package body defines the internal air space, and wherein the humidity control insert is formed as part of the package body.

16. The package of claim 12 , wherein the package body is a cigarette package body.

17. The package of claim 16 , wherein the humidity control insert is bonded to a foil located within the cigarette package body.

18. The package of claim 12 , wherein the humidity control insert is integrated into the package body.

19. The humidity control insert of claim 1 , wherein both sides of the humidity control insert are laminated with a water vapor permeable film that is resistant to liquid moisture permeation.

20. A package for a moisture laden article, comprising a package body and the humidity control insert of claim 1 , the humidity control insert adapted to release moisture retained therein into an internal air space defined by the package body.

21. The package of claim 20 , wherein the moisture laden article is selected from the group consisting of snuff, snus, cigars, dissolvable tobacco products, and nicotine replacement therapy (NRT) products.

22. The package of claim 20 , wherein the moisture laden article is selected from the group consisting of food products and herbs.

23. The humidity control insert of claim 1 , wherein the hygroscopic powder material accounts for 5-40 wt. % of the dry weight of humidity control insert.

24. The humidity control insert of claim 1 , wherein the hygroscopic powder material accounts for 10-30 wt. % of the dry weight of humidity control insert.

25. The humidity control insert of claim 1 , wherein the hygroscopic powder material is homogeneously dispersed inside the porous nonwoven fibrous substrate.