Aromatic Polyester Magnetic Recording Medium Stability
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Solution Overview
Problem
Magnetic recording media with aromatic polyester supports experience stability issues when exposed to temperature changes from high to low temperatures under low humidity, leading to deterioration in running stability, especially in low temperature and low humidity environments.
Innovation Solution
A magnetic recording medium with an aromatic polyester support, a magnetic layer, and a back coating layer, where the spacing difference measured by optical interferometry after ethanol cleaning is between 0 nm and 15.0 nm, and the support has a moisture absorption of 0.3% or less, to stabilize the running of the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the magnetic recording medium is stored in a low temperature and low humidity environment, then power saving is achieved and environmental management costs are reduced, but running stability deteriorates
Solution Approach 1:
The patent changes the physical-chemical parameters of the aromatic polyester support by controlling its moisture absorption rate to 0.3% or less. This parameter modification enables the support to maintain dimensional stability and running characteristics even in low temperature and low humidity environments, thus resolving the contradiction between power saving and running stability.
Solution Approach 2:
The patent uses a composite structure consisting of an aromatic polyester support with controlled moisture absorption properties combined with a back coating layer. This composite material approach allows the medium to maintain running stability across different environmental conditions while enabling power saving in data centers.
2Ease of manufacture
If the spacing difference (Safter-Sbefore) is large, then ethanol cleaning effectiveness is high, but running stability deteriorates
Solution Approach 1:
The patent precisely controls the spacing difference parameter to be within 0 nm to 15.0 nm after ethanol cleaning. This parameter optimization balances the removal of surface contaminants during manufacturing with the preservation of running stability, resolving the contradiction between cleaning effectiveness and operational reliability.
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 solution effectively prevents deterioration in running stability of the magnetic recording medium even after temperature changes, ensuring stable performance in varying environmental conditions.
Implementation Method 1
a spacing difference (Safter-Sbefore) before and after ethanol cleaning measured by optical interferometry
Implementation Method 2
the non-magnetic support is an aromatic polyester support having a moisture absorption of 0.3% or less
Data Source
AI summary
The magnetic recording medium includes a non-magnetic support; a magnetic layer including a ferromagnetic powder on one surface of the non-magnetic support; and a back coating layer including a non-magnetic powder on the other surface of the non-magnetic support, in which a difference (Safter−Sbefore) between a spacing Safter measured by optical interferometry regarding a surface of the back coating layer after ethanol cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the back coating layer before ethanol cleaning is greater than 0 nm and equal to or smaller than 15.0 nm, and the non-magnetic support is an aromatic polyester support having a moisture absorption of 0.3% or less.