Archival aperture card

• US 5,264,080 A
• Filed: 07/31/1992
• Issued: 11/23/1993
• Est. Priority Date: 04/12/1991
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Harris, James M., Shaw, Jeffry S., Kratzer, Al
• Primary Examiner(s): Chin, Peter
• Application Number:
  US07/923,142
• Time in Patent Office: 480 Days
• Field of Search: 162/135, 162/141, 162/149, 162/185, 162/175, 162/146, 162/158, 162/181.2
• US Class Current: 162/135
• CPC Class Codes: D21H 11/14 Secondary fibres working-up waste paper D21C5/02

Abstract

Archival quality aperture cards manufactured from stock formulation including:

1. between 40 and 60% southern softwood kraft pulp;

2. between 60 and 40% northern mixed hardwood pulp;

3. between 1.5 and 2.5% on total pulp, calcium carbonate for alkaline reserve;

4. between 0.05 and 1.0% on total pulp, alkyl ketene dimer as an internal sizing agent;

5. between 0.2 and 1.0% on total pulp, cationic potato starch for internal bonding improvements;

6. between 0.5 and 2.0% on total pulp, cationic potato starch as a surface sizing agent;

7. between 0.5 and 2.5% solids added to the surface sizing agent, alkyl ketene dimer as a slip agent; and

8. between 0.01 and 0.3% dyed rayon granitizing fibers.

Claims

1. Archival film mount stock manufactured from a formulation including:

between 40 and 60% softwood pulp;

between 60 and 40% hardwood pulp;

between 1.5 and 2.5% on total pulp, alkaline earth carbonate;

between 0.1 and 0.2% on total pulp, internal sizing agent;

between 0.2 and 0.5% on total pulp, cationic starch;

between 0.1 and 0.2% on total pulp, surface sizing agent; and

between 0.5 and 1.5% solids added to the surface sizing agent, of a slip agent.

2. The film mount stock of claim 1 wherein the formulation further includes between 0.1 and 0.3% on total pulp, granitizing fiber

3. The film mount stock of claim 1 wherein the softwood pulp in the formulation includes northern softwood kraft pulp.

4. The film mount stock of claim 3 wherein the softwood pulp in the formulation includes about 50% northern softwood kraft pulp.

5. The film mount stock of claim 1 wherein the hardwood pulp in the formulation includes northern mixed hardwood pulp.

6. The film mount stock of claim 5 wherein the hardwood pulp in the formulation includes 50% northern mixed hardwood pulp.

7. The film mount stock of claim 1 wherein the alkaline earth carbonate in the formulation include calcium carbonate.

8. The film mount stock of claim 7 wherein the alkaline earth carbonate in the formulation includes about 2.2% fine-ground calcium carbonate.

9. The film mount stock of claim 1 wherein the internal sizing agent in the formulation includes alkenyl succinic anhydride.

10. The film mount stock of claim 9 wherein the internal sizing agent in the .formulation includes about 0.15% alkenyl succinic anhydride.

11. The film mount stock of claim 1 wherein the cationic starch in the formulation includes cationic potato starch.

12. The film mount stock of claim 11 wherein the cationic starch in the formulation includes about 0.3% cationic potato starch.

13. The film mount stock of claim 1 wherein the surface sizing agent in the formulation includes cationic potato starch.

14. The film mount stock of claim 13 wherein the surface sizing agent in the formulation includes about 0.15% cationic potato starch.

15. The film mount stock of claim 1 wherein the slip agent in the formulation includes alkyl ketene dimer.

16. The film mount stock of claim 15 wherein the slip agent in the formulation includes about 1.0% solids level alkyl ketene dimer in the surface sizing agent.

22. The film mount stock of claim 2 wherein the softwood pulp in the formulation includes about 50% softwood kraft pulp.

17. Archival film mount stock manufactured from a formulation including:

between 40 and 60% northern softwood kraft pulp;

between 60 and 40% northern mixed hardwood pulp;

between 1.5 and 2.5% on total pulp, calcium carbonate;

between 0.1 and 0.2% total pulp, alkenyl succinic anhydride;

between 0.2 and 0.5% on total pulp, cationic potato starch;

between 0.1 and 0.2% on total pulp, cationic potato starch as a surface sizing agent; and

between 0.5 and 1.5% solids in the surface sizing agent, alkyl ketene dimer as a slip agent.

18. The film mount stock of claim 17 wherein the formulation further includes between 0.and .3% on total pulp, granitizing fiber.

19. Archival film mount stock manufactured from a formulation including:

a mixture of hardwood pulp and softwood pulp containing at east 10% softwood pulp;

an amount of alkalne earth carbonate which provides the stock with an alkaline reserve greater than a molar equivalent of about 2% calcium carbonate, and an ash content below bout 2%;

between about 0.05 and 1.00% on total pulp, internal sizing agent;

between about 0.1 and 1.5% on total pulp, cationic starch;

between about 0.05 and 2.00% on total pulp, surface sizing agent; and

between about 0.5 and 1.5% solids added to the surface sizing agent, of a slip agent.

20. The film mount stock of claim 19 wherein the formulation further includes between about 0.01 and 0.30% on total pulp, granitizing fibers.

21. The film mount stock of claim 19 wherein the softwood pulp includes softwood kraft pulp.

23. The film mount stock of claim 19 wherein the hardwood pulp in the formulation includes mixed hardwood pulp.

24. The film mount stock of claim 23 wherein the hardwood pulp in the formulation includes about 50% mixed hardwood pulp.

25. The film mount stock of claim 19 wherein the alkaline earth carbonate in the formulation includes calcium carbonate.

26. The film mount stock of claim 25 wherein the alkaline earth carbonate in the formulation includes about 2%, on total pulp, fine-ground calcium carbonate.

27. The film mount stock of claim 19 wherein the internal sizing agent includes alkenyl succinic anhydride.

28. The film mount stock of claim 27 wherein the internal sizing agent in the formulation includes about 0.15% alkenyl succinic anhydride.

29. The film mount stock of claim 19 wherein the cationic starch in the formulation includes cationic potato starch.

30. The film mount stock of claim 29 wherein the cationic starch in the formulation includes about 0.7% cationic potato starch.

31. The film mount stock of claim 19 wherein the surface sizing agent in the formulation includes cationic potato starch.

32. The film mount stock of claim 31 wherein the surface sizing agent in the formulation includes about 1.0% cationic potato starch.

33. The film mount stock of claim 19 wherein the slip agent in the formulation includes alkyl ketene dimer.

34. The film mount stock of claim 33 wherein the slip agent in the formulation includes about 1.0% solids level alkyl ketene dimer in the surface sizing agent.

35. The film mount stock of claim 19 where in the alkaline earth carbonate in the formulation includes between about 1.0 and 2.5% alkaline earth carbonate on total pulp.

36. Archival film mount stock manufactured from a formulation including:

a mixture of hardwood pulp and softwood pulp containing at least 10% softwood pulp;

between about 1.5 and 2.5% on total pulp, calcium carbonate;

between about 0.05 and 0.20% on total pulp, alkenyl succinc anhydride;

between about 0.2 and 1.0% on total pulp, cationic potato starch;

between about 0.1 and 1.0% on total pulp, cationic potato starch as a surface sizing agent; and

between about 0.5 and 1.5% solids in the surface sizing agent, alkyl ketene dimer as a slip agent.

37. The film mount stock of claim 36 wherein the formulation further includes between about 0.01 and 0.3% on total pulp, granitizing fibers.

38. Archival film mount stock manufactured from a formulation including:

a mixture of hardwood pulp and softwood pulp containing at least 10% softwood pulp;

an amount of alkalne earth carbonate which provides the stock with an alkaline reserve greater than a molar equivalent of about 2% calcium carbonate, and an ash content below about 2%;

between about 0.05 and 1.0% on total pulp, internal sizing agent;

between about 0.2 and 1.0% on total pulp, cationic starch;

between about 0.5 and 2.0% on total pulp, surface sizing agent; and

between about 0.5 and 2.5% solids added to the surface sizing agent, of a slip agent.

39. The film mount stock of claim 38 wherein the formulation further includes between about 0.0and 0.30% on total pulp, granitizing fibers.

40. The film mount stock of claim 38 wherein the softwood pulp includes softwood kraft pulp.

41. The film mount stock of claim 40 wherein the softwood pulp in the formulation includes about 50% southern softwood kraft pulp.

42. The film mount stock of claim 38 wherein the hardwood pulp in the formulation includes mixed hardwood pulp.

43. The film mount stock of claim 42 wherein the hardwood pulp in the formulation includes about 50% mixed hardwood pulp.

44. The film mount stock of claim 38 wherein the alkaline earth carbonate in the formulation includes calcium carbonate.

45. The film mount stock of claim 44 wherein the alkaline earth carbonate in the formulation includes about 2%, on total pulp, fine-ground calcium carbonate.

46. The film mount stock of claim 38 wherein the internal sizing agent include alkyl ketene dimer.

47. The film mount stock of claim 46 wherein the internal sizing agent in the formulation includes about 0.1% alkyl ketene dimer.

48. The film mount stock of claim 38 wherein the cationic starch in the formulation includes cationic potato starch.

49. The film mount stock of claim 48 wherein the cationic starch in the formulation includes about 0.8% cationic potato starch.

50. The film mount stock of claim 38 wherein the surface sizing agent in the formulation includes cationic potato starch.

51. The film mount stock of claim 50 wherein the surface sizing agent in the formulation includes about cationic potato starch.

52. The film mount stock of claim 38 wherein the slip agent in the formulation includes alkyl ketene dimer.

53. The film mount stock of claim 52 wherein the slip agent in the formulation includes about 1.7% solids level alkyl ketene dimer in the surface sizing agent.

54. The film mount stock of claim 38 where in the alkaline earth carbonate in the formulation includes between about 1.0 and 2.5% alkaline earth carbonate on total pulp.

55. Archival film mount stock manufactured from a formulation including:

a mixture of hardwood pulp and softwood pulp containing at least 10% softwood pulp;

between about 1.5 and 2.5% on total pulp, calcium carbonate;

between about 0.05 and 1.0% on total pulp, alkyl ketene dimer;

between 0.2 and 1.0% on total pulp, cationic potato starch;

between about 0.5 and 2.0% on total pulp, cationic potato starch as a surface sizing agent; and

between about 0.5 and 2.5% solids in the surface sizing agent, alkyl ketene dimer as a slip agent.

56. The film mount stock of claim 55 wherein the formulation further includes between about 0.01 and 0.3% on total pulp, granitizing fibers.