Multilayer dissolvable solid article with apertures or holes

1. A dissolvable solid article comprising two or more flexible and dissolvable sheets, wherein each of said two or more sheets comprises a water-soluble polymer; wherein said dissolvable solid article has a thickness of no less than 2 mm; wherein said article has opposing first and second surfaces; wherein said article comprises one or more apertures or holes that extend from said first surface through said second surface; wherein each of said one or more apertures or holes is characterized by a width or diameter ranging from 0.2 mm to 0.8 mm and the sum of the volume of said one or more apertures or holes is from 0.5% to 15% by total volume of said article.

2. The dissolvable solid article of claim 1 , wherein the width or diameter of each of said one or more apertures or holes ranges from 0.3 mm to 0.6 mm.

3. The dissolvable solid article according to claim 1 , comprising from 4 to 100 of said holes, wherein said holes are spaced apart by equal distances.

4. The dissolvable solid article according to claim 1 , comprising from 1 to 10 of said apertures, wherein each of said apertures has a length ranging from 1 cm to 20 cm.

5. The dissolvable solid article according to claim 1 , wherein each of said two or more flexible and dissolvable layers is characterized by a thickness ranging from 0.1 mm to 10 mm.

6. The dissolvable solid article according to claim 1 , wherein said article comprises from 4 to 50, of said flexible and dissolvable sheets.

7. The dissolvable solid article according to claim 1 , wherein the thickness of said article is from 3 mm to 20 cm.

8. The dissolvable solid article according to claim 1 , wherein at least one of said two or more flexible and dissolvable sheets comprises from 15% to 40% of said water-soluble polymer by total weight of said sheet.

9. The dissolvable solid article according to claim 8 , wherein said at least one sheet further comprises from 30% to 80% of a surfactant by total weight of said sheet.

10. The dissolvable solid article according to claim 1 , which is characterized by a maximum dimension D along a direction that is perpendicular to its thickness z, wherein the ratio of D/z ranges from 2 to 7.

11. The dissolvable solid article according to claim 1 , wherein said article is characterized by a density ranging from 0.1 g/cm 3 to 0.4 g/cm 3 .

12. The dissolvable solid article according to claim 1 , wherein said article is characterized by a final moisture content of by weight of said article.

13. The dissolvable solid article of claim 1 , wherein the Volume Percentage of said one or more apertures or holes is from 1% to 10%, by total volume of said article.

14. The dissolvable solid article of claim 1 , wherein the Volume Percentage of said one or more apertures or holes is from 2% to 5%, by total volume of said article.

15. The dissolvable solid article of claim 1 , wherein the width or diameter of each of said one or more apertures or holes ranges from 0.4 mm to 0.5 mm.

16. The dissolvable solid article according to claim 1 , comprising from 1 to 10 of said apertures, wherein each of said apertures has a length ranging from 1.5 cm to 10 cm.

17. The dissolvable solid article according to claim 1 , comprising from 1 to 10 of said apertures, wherein each of said apertures has a length ranging from 2 cm to 5 cm.

18. The dissolvable solid article according to claim 1 , wherein the thickness of said article is from 4 mm to 10 cm.

19. The dissolvable solid article according to claim 1 , wherein the thickness of said article is from 5 mm to 30 mm.

20. The dissolvable solid article according to claim 1 , wherein each of said one or more apertures or holes is characterized by a width or diameter ranging of about 0.4 mm and the sum of the volume of said one or more apertures or holes is from about 1% to about 10% by total volume of said article.