Magnetic Tape Surface Roughness and Contact Angle Control
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Solution Overview
Problem
Magnetic tapes with increased surface smoothness for improved electromagnetic conversion characteristics experience a decrease in reproduction output during repeated running, particularly in high-speed environments with high temperature and high humidity.
Innovation Solution
A magnetic tape with a center line average surface roughness of 1.8 nm or less, a logarithmic decrement of 0.050 or less, and a 1-bromonaphthalene contact angle between 45.0° and 55.0°, incorporating ferromagnetic powder and a binding agent, along with a non-magnetic support and optional non-magnetic layers, to prevent component attachment to the head and maintain output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surface smoothness of the magnetic layer is increased to improve electromagnetic conversion characteristics, then electromagnetic conversion characteristics are improved, but reproduction output decreases during repeated running
Solution Approach 1:
The invention changes the surface roughness parameter to a specific range (Ra 0.3 nm to 1.8 nm) and controls the contact angle parameter (40° to 60°) to achieve optimal balance between electromagnetic conversion characteristics and prevention of component attachment during repeated running
Solution Approach 2:
The magnetic layer uses a composite formulation including ferromagnetic powder, binding agent, and lubricant components that work together to provide both smooth surface for good electromagnetic characteristics and controlled surface properties to prevent head contamination during repeated use
2Manufacturing precision
If surface smoothness is increased to narrow the interval between magnetic layer surface and head, then electromagnetic conversion characteristics are improved, but component attachment to the head increases during repeated running
Solution Approach 1:
The lubricant components in the magnetic layer act as an intermediary substance that reduces direct contact and adhesion between the magnetic layer surface and the head, preventing component attachment while maintaining the narrow spacing required for good electromagnetic conversion
Solution Approach 2:
The contact angle parameter is controlled to a specific range (40° to 60°) which modifies the surface wettability and adhesion properties, reducing component attachment to the head while maintaining smooth surface for electromagnetic performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The magnetic tape exhibits excellent electromagnetic conversion characteristics while preventing a decrease in reproduction output during repeated high-speed running in high temperature and high humidity conditions by controlling surface roughness and contact angle, reducing component attachment to the head.
Implementation Method 1
a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm
Implementation Method 2
a contact angle with respect to 1-bromonaphthalene measured regarding the surface of the magnetic layer is 45.0° to 55.0°
Implementation Method 3
improve electromagnetic conversion characteristics
Data Source
AI summary
A magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm. The logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050, and the contact angle with respect to 1-bromonaphthalene measured regarding the surface of the magnetic layer is 45.0° to 55.0°.