Apparatus for calendering magnetic recording medium
AssigneeYamauchi Corporation
InventorsAtsuo Watanabe, Kenjiro Nakayama, Tatsuyuki Abe
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Abstract
In the resin roll 5 for calendering a magnetic recording medium, a surface portion 3a of a thermosetting resin outer layer 3 has high storage elastic modulus (E′) of 5×1010 to 5×1011 dyn/cm2 at a temperature of 50° to 150° C. at a frequency of 10 hertz (Hz). At the surface portion of the thermosetting resin outer layer, the expression representing the relation between storage elastic modulus (E′) and the Poisson's ratio (ν) is within the following range, under the same conditions: 2×10−12 cm2/dyn<(1−ν2)/E′<2×10−11 cm2/dyn.
Claims14
An apparatus for calendering a magnetic recording medium for performing surface processing of the magnetic recording medium by nip pressure between a metal roll and an elastic roll, wherein
- said elastic roll includes a metal roll core (1) and a thermosetting resin outer layer (3), a surface portion of the thermosetting resin outer layer having a storage elastic modulus (E′) of 5×1010 to 5×1011 dyn/cm2 at a temperature from 50 to 150° C. at a frequency of 10 Hz.
An apparatus for calendering a magnetic recording medium for performing surface processing of the magnetic recording medium by nip pressure between a metal roll and an elastic roll, wherein
- said elastic roll includes a metal roll core (1) and thermosetting resin outer layer (3), at a surface portion of which thermosetting resin outer layer, an expression (1−ν2)/E′ representing relation between storage elastic modulus (E′) and Poisson's ratio (ν) in relation to Hertz's equation representing nip width is within a range of
- 2×10−12 cm2/dyn<(1−ν2)/E′<2×10−11 cm2/dyn
- at a temperature from 50 to 150° C. at a frequency of 10 Hz.
Dependencies are inferred from the claim text.