Claims
- 1. A method for producing a magnetic recording medium, comprising:
applying a non-magnetic back coat to a substrate; applying a magnetic front coat to the substrate; in-line calendering the coated substrate using opposed rolls, at least one of the rolls being a generally compliant roll; and off-line calendering the coated substrate using opposed, generally non-compliant rolls.
- 2. The method of claim 1, wherein the magnetic front coat is a dual-layer front coat.
- 3. The method of claim 1, wherein the method comprises only one off-line calendering pass.
- 4. The method of claim 1, wherein the method comprises only one in-line calendering pass.
- 5. The method of claim 1, wherein the method comprises only one off-line calendering pass, the off-line calendering pass occurring after the in-line calendering pass.
- 6. The method of claim 1, wherein the in-line calendering comprises applying the generally compliant roll to a side of the substrate having the back coat; further wherein the in-line calendering comprises applying an additional generally non-compliant roll to a side of the substrate having the front coat.
- 7. The method of claim 1, wherein the off-line calendering occurs at a nip pressure of at least about 2200 pli and a temperature of at least about 195° F.
- 8. A magnetic recording medium produced by a method comprising:
applying a non-magnetic back coat to a substrate; applying a magnetic front coat to the substrate; in-line calendering the coated substrate using opposed rolls, at least one of the rolls being a generally compliant roll; and off-line calendering the substrate using opposed, generally non-compliant rolls.
- 9. The magnetic recording medium of claim 8, wherein the magnetic front coat comprises a non-magnetic lower layer and a magnetic upper layer.
- 10. The magnetic recording medium of claim 8, wherein the magnetic recording medium is in linear magnetic tape format.
- 11. A method for producing a magnetic recording medium, comprising:
applying a non-magnetic back coat to a substrate; applying a magnetic front coat to the substrate; and calendering the coated substrate using at least one nip, wherein the calendering includes calendering the coated substrate through a final nip comprising generally non-compliant rolls.
- 12. The method of claim 11, wherein the calendering comprises in-line calendering using in-line generally compliant rolls followed by in-line generally non-compliant rolls.
- 13. The method of claim 11, wherein the calendering comprises off-line calendering using off-line generally compliant rolls followed by off-line generally non-compliant rolls.
- 14. The method of claim 11, wherein the calendering comprises in-line calendering using in-line generally non-compliant rolls followed by off-line calendering using off-line generally non-compliant rolls.
- 15. The method of claim 11, wherein the calendering comprises in-line calendering using in-line generally compliant rolls followed by off-line calendering using off-line generally non-compliant rolls.
- 16. The method of claim 11, wherein the magnetic front coat has a thickness of less than about 2.5 microns.
- 17. The method of claim 11, wherein the final nip defines a nip pressure of at least about 700 pli and a roll temperature of at least about 100° F.
- 18. A magnetic recording medium produced by a method comprising:
applying a non-magnetic back coat to a substrate; applying a magnetic front coat to the substrate; and calendering the coated substrate using at least one nip, wherein the calendering includes calendering the coated substrate through a final nip comprising generally non-compliant rolls.
- 19. The magnetic recording medium of claim 18, wherein the magnetic recording medium defines a roughness average (Ra) of no more than about 6.3 nm.
- 20. The magnetic recording medium of claim 17, wherein the magnetic recording medium comprises Digital Linear Tape.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The subject matter of this application is related to the subject matter of U.S. Provisional Patent Application No. 60/415,354, filed Oct. 1, 2002, priority to which is claimed under 35 U.S.C. §119(e) and which is incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60415354 |
Oct 2002 |
US |