Coating processes – Magnetic base or coating – Magnetic coating
Patent
1977-07-25
1978-12-05
Pianalto, Bernard D.
Coating processes
Magnetic base or coating
Magnetic coating
427128, H01F 1002
Patent
active
041286731
ABSTRACT:
In a method for super calendering a magnetic recording element comprising a non-magnetic flexible support having provided thereon a magnetic layer mainly composed of ferromagnetic powders and a binder using a super calendering roll assembly having a metal roll in contact with the magnetic layer side and an elastic roll in contact with the support side opposite the metal roll, which comprises pressing the surface of the magnetic layer to thereby super calender the same, at least the surface area of the elastic roll comprises a polyamide resin having a Shore hardness D of at least about 70 and having a linear expansion coefficient of at least about 8 .times. 10.sup.-5 /.degree. C.
An improved super calendering roll assembly for magnetic tape which comprises a metal roll axis having provided therearound an elastic roll and further having provided endplates around the metal roll axis at two positions which are longer than the length of the elastic roll in the direction of the axis thereof and are at a length corresponding to the thermal expansion point of the elastic roll, at least the surface area of the elastic roll thus provided comprising a polyamide resin as defined above.
Magnetic tapes having excellent surface properties can thus be obtained, which are suitable for use as video tapes, memory tapes and audio tapes requiring decreased chromanoise and high sensitivity.
REFERENCES:
patent: 2688567 (1954-09-01), Franck
patent: 3216846 (1965-11-01), Hendricx et al.
patent: 3398011 (1968-08-01), Neirotti et al.
patent: 3473960 (1969-10-01), Jacobson et al.
Fujiyama Masaaki
Watanabe Kenzi
Fuji Photo Film Co. , Ltd.
Pianalto Bernard D.
LandOfFree
Method for super calendering magnetic recording elements does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for super calendering magnetic recording elements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for super calendering magnetic recording elements will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-287462