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1. WO2007138624 - INK JET CARTRIDGE HAVING AN INK CONTAINER COMPRISING TWO POROUS MATERIALS

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[ EN ]

CLAIMS

1. An ink jet cartridge (100) comprising an ink container (105) which comprises a bottom portion (110) and an upper portion (120), said bottom portion (110) being in communication with the printhead (135) through an ink supply port (130), and said upper portion (120) being in communication with a vent hole (140), wherein said bottom portion (110) comprises a first ink absorbing member (150), and said upper portion (120) comprises a second ink absorbing member (160), wherein said first ink absorbing member (150) is a compressible porous material and said second ink absorbing member (160) is an incompressible porous material, and wherein the capillarity of said first ink absorbing member (150) is higher than the capillarity of said second ink absorbing member (160).

2. The ink jet cartridge (100) according to claim 1 , wherein said compressible porous material is a solid foam material.

3. The ink jet cartridge (100) according to claim 1 , wherein said incompressible porous material is a fibrous material.

4. The ink jet cartridge (100) according to claim 2, wherein said solid foam material is selected from the group consisting of polyurethane, polyvinylalcohol, polyether, melamine resin, polystyrene, neoprene, polyolefine, polyester, and mixture thereof.

5. The ink jet cartridge (100) according to claim 3, wherein said fibrous material is selected from the group consisting of natural and synthetic fibers.

6. The ink jet cartridge (100) according to claim 5, wherein said natural fibers are selected from the group consisting of cotton, linen, jute, flax, ramie, sisal and hemp.

7. The ink jet cartridge (100) according to claim 5, wherein said synthetic fibers are selected from the group consisting of cellulose acetate, polyester, poyolefine, polyamide, polyacrylic, polyacrilate, polyacrilonitrile, and mixture thereof.

8. The ink jet cartridge (100) according to claim 5, wherein said synthetic fibers are selected from the group consisting of polyethylene, polypropylene, polyamide, polyester and mixture thereof.

9. The ink jet cartridge (100) according to claim 5, wherein said synthetic fibers are selected from the group consisting of synthetic fibers having a core and sheath structure.

10. The ink jet cartridge (100) according to claim 9, wherein said core is made of a material selected from the group of polyester and polyolefin.

11. The ink jet cartridge (100) according to claim 9, wherein said sheath is made of a material selected from the group of polyester, polyolefin and polyurethane.

12. The ink jet cartridge (100) according to claim 3, wherein the density of said fibrous material ranges from 0.040 to 0.400 g/cm3.

13. The ink jet cartridge (100) according to claim 3, wherein the density of said fibrous material ranges from 0.060 to 0.300 g/cm3.

14. The ink jet cartridge (100) according to claim 3, wherein the density of said fibrous material ranges from 0.080 to 0.200 g/cm3.

15. The ink jet cartridge (100) according to claim 3, wherein the fibers of said fibrous material are arranged substantially parallel to the side walls of said upper portion (120).

16. The ink jet cartridge (100) according to claim 3, wherein the fibers of said fibrous material are arranged substantially perpendicular to the contact plane (215) of said upper portion (120) with said bottom portion (110).

17. The ink jet cartridge (100) according to claim 1 , wherein the bottom surface of said second ink absorbing member (160) protrudes below the surface plane (210) of said first ink absorbing member (150).

18. The ink jet cartridge (100) according to claim 17, wherein the protrusion of said bottom surface of said second ink absorbing member (160) below said surface plane (210) of said first ink absorbing member (150) is equal to or lower than 2.5 mm.

19. The ink jet cartridge (100) according to claim 17, wherein the protrusion of said bottom surface of said second ink absorbing member (160) below said surface plane (210) of said first ink absorbing member (150) is equal to or lower than 2.0 mm.

20. The ink jet cartridge (100) according to claim 17, wherein the protrusion of said bottom surface of said second ink absorbing member (160) below said surface plane (210) of said first ink absorbing member (150) is equal to or lower than 1.5 mm.

21. The ink jet cartridge (100) according to claim 1 , wherein the capillarity of said first ink absorbing member (150) is higher than the capillarity of said second ink absorbing member (160).

22. The ink jet cartridge (100) according to claim 21 , wherein said capillarity of said first ink absorbing member (150) is at least 1 CmH2O higher than said capillarity of the second ink absorbing member (160).

23. The ink jet cartridge (100) according to claim 21 , wherein said capillarity of said first ink absorbing member (150) is at least 2 CmH2O higher than the capillarity of said second ink absorbing member (160).

24. The ink jet cartridge (100) according to claim 21 , wherein said capillarity of said first ink absorbing member (150) is at least 3 cmH2O higher than the capillarity of said second ink absorbing member (160).

25. The ink jet cartridge (100) according to claim 1 , wherein the capillarity of said first ink absorbing member (150) is higher than the pressure head of said ink jet cartridge (100).

26. The ink jet cartridge (100) according to claim 1 , wherein the capillarity of said second ink absorbing member (160) is higher than said pressure head of said ink jet cartridge (100).

27. The ink jet cartridge (100) according to claims 25 and 26, wherein said capillarity of said first and second ink absorbing member (160)s has a value of at least

1 CmH2O higher than the pressure head of said ink jet cartridge (100).

28. The ink jet cartridge (100) according to claims 25 and 26, wherein said capillarity of said first and second ink absorbing member (160)s has a value of at least

2 CmH2O higher than the pressure head of said ink jet cartridge (100).

29. The ink jet cartridge (100) according to claims 25 and 26, wherein said capillarity of said first and second ink absorbing member (160)s has a value of at least

3 CmH2O higher than the pressure head of said ink jet cartridge (100).

30. The ink jet cartridge (100) according to claim 1 , wherein the bottom surface of said second ink absorbing member (160) protrudes below the contact plane

(215) of said upper portion (120) with said bottom portion (110).

31. The ink jet cartridge (100) according to claim 30, wherein the protrusion of said bottom surface of said second ink absorbing member (160) below said contact plane (215) of said upper portion (120) with said bottom portion (110) is equal to or lower than 5 mm.

32. The ink jet cartridge (100) according to claim 30, wherein the protrusion of said bottom surface of said second ink absorbing member (160) below said contact plane (215) of said upper portion (120) with said bottom portion (110) is equal to or lower than 4 mm.

33. The ink jet cartridge (100) according to claim 30, wherein the protrusion of said bottom surface of said second ink absorbing member (160) below said contact plane (215) of said upper portion (120) with said bottom portion (110) is equal to or lower than 3 mm.

34. A process for manufacturing an ink jet cartridge (100) comprising an ink container (105) which comprises the following steps: to provide an upper portion (120) of said ink container (105) being in communication with a vent hole (140) and able to contain a second ink absorbing member (160),
to provide a bottom portion (110) of said ink container (105) being in communication with the printhead (135) through an ink supply port (130) and able to contain a first ink absorbing member (150) having a capillarity higher than the capillarity of said second ink absorbing member (160) and higher than the pressure head of said ink jet cartridge (100),
to insert in said bottom portion (110) said first ink absorbing member (150) comprised of a compressible porous material allowing the upper surface (170) of said first ink absorbing member (150) to have a convex shape protruding over the surface plane (210) of said first ink absorbing member (150),
to insert in said upper portion (120) said second ink absorbing member (160) comprised of an incompressible porous material allowing the bottom surface (230) of said second ink absorbing member (160) to protrude from the contact plane (215) of said upper portion (120) with said bottom portion (110), and
to join together said bottom and upper portions (110,120) so as to allow the bottom surface (230) of said second ink absorbing member (160) to contact the upper surface (170) of said first ink absorbing member (150) and to protrude below the surface plane (210) of said first ink absorbing member (150).

35. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height (Hi) of said convex portion protruding above said surface plane (210) is lower than 3 mm.

36. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height (H1) of said convex portion protruding above said surface plane (210) is lower than 2 mm.

37. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height (H1) of said convex portion protruding above said surface plane (210) is lower than 1 mm.

38. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the distance of said surface plane (210) from said contact plane (215) is equal to or lower than 3 mm.

39. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the distance of said surface plane (210) from said contact plane (215) is equal to or lower than 2 mm.

40. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the distance of said surface plane (210) from said contact plane

(215) is equal to or lower than 1 mm.

41. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height (H2) of the protrusion of said bottom surface below said contact plane (215) is equal to or lower than 5 mm.

42. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height (H2) of the protrusion of said bottom surface below said contact plane (215) is equal to or lower than 4 mm.

43. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height (H2) of the protrusion of said bottom surface below said contact plane (215) is equal to or lower than 3 mm.

44. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height of the protrusion of said bottom surface below said surface plane (210) is equal to or lower than 2.5 mm.

45. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height of the protrusion of said bottom surface below said surface plane (210) is equal to or lower than 2 mm.

46. The process for manufacturing of an ink jet cartridge (100) according to claim 34, wherein the height of the protrusion of said bottom surface below said surface plane (210) is equal to or lower than 1.5 mm.

47. An ink container (105) which comprises a bottom portion (110) and an upper portion (120), wherein said bottom portion (110) comprises a first ink absorbing member (150), and said upper portion (120) comprises a second ink absorbing member (160), wherein said first ink absorbing member (150) is a compressible porous material and said second ink absorbing member (160) is an incompressible porous material, and wherein the capillarity of said first ink absorbing member (150) is higher than the capillarity of said second ink absorbing member (160).

48. The ink container (105) according to claim 47, wherein said bottom portion

(110) is provided with an ink supply port (130).

49. The ink container (105) according to claim 47, wherein said upper portion (120) is provided with a vent hole (140).