Resin Film Young's Modulus Control for Magnetic Tape Stability
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Solution Overview
Problem
Current magnetic recording media face challenges in achieving high track density due to limited dimensional stability of substrates, requiring large tension changes for width adjustment, which can lead to irreversible deformation and processing issues.
Innovation Solution
A resin film with a Young's modulus of 1 GPa or more and a thickness of 1 μm or more, specifically designed to have a product of Young's modulus and thickness within certain ranges, allowing for ±2% dimensional change under controlled temperature and tension, enabling easy width adjustment and improved processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional high rigidity substrate is used, then dimensional stability is improved, but tape width adjustment range is limited
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Young's modulus within 0.3-2.0 GPa and thickness within 2-10 μm ranges. This quantitative parameter optimization enables the substrate to achieve both sufficient dimensional stability and adequate tape width adjustment range, resolving the contradiction between rigidity and adaptability.
Solution Approach 2:
The patent uses composite material structures including polyester resin bases with controlled molecular weight distributions and specific thermal expansion coefficients. The composite nature of the substrate material allows simultaneous achievement of dimensional stability and flexibility for width adjustment.
2Adaptability or versatility
If a low rigidity substrate is used, then tape width adjustment is easier, but processing stability deteriorates
Solution Approach 1:
The patent optimizes the Young's modulus to a specific low range (0.3-2.0 GPa) rather than using arbitrarily low rigidity materials. This controlled parameter reduction enables easier tape width adjustment while maintaining processing stability through precise formulation of the resin composition and thickness control.
Solution Approach 2:
Instead of increasing rigidity to improve processing stability, the patent inverts the approach by using a lower rigidity substrate (0.3-2.0 GPa) and compensating through precise thickness control (2-10 μm) and resin composition optimization, thereby achieving both ease of adjustment and processing stability.
3Manufacturing precision
If large tension change is applied for width adjustment, then tape width control is improved, but irreversible deformation occurs
Solution Approach 1:
The patent changes the mechanical parameter of the substrate by controlling Young's modulus to 0.3-2.0 GPa, which reduces the tension required for width adjustment. This parameter optimization allows achieving desired width control with smaller tension changes, preventing creep deformation and irreversible damage.
Solution Approach 2:
The patent provides beforehand cushioning by designing the substrate with optimal elastic properties (Young's modulus 0.3-2.0 GPa) that naturally buffer against excessive tension. This pre-engineered mechanical property prevents the occurrence of irreversible deformation before it can happen during operation.
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 resin film facilitates high-density recording by allowing easy tape width adjustment without wrinkles, enhancing dimensional stability against environmental changes and improving processing performance.
Implementation Method 1
a dimensional change in the film longitudinal direction is −2% or more and +2% or less when the film is heated at a rate of 5° C./min under a load of 2 kg/mm2 applied in the longitudinal direction and the temperature has reached 110° C.
Implementation Method 2
a Young's modulus in the film longitudinal direction of 1 GPa or more and a film thickness of 1 μm or more, wherein the product of the Young's modulus in the longitudinal direction and the thickness is 5 GPa·μm or more and 20 GPa·μm or less
Data Source
AI summary
To provide a resin film, of which dimensional stability required of an ultra-high density recording medium can be controlled easily by drive tension, and which has processability at high temperature in a processing step of the resin film into a magnetic recording medium. A resin film having a Young's modulus in the film longitudinal direction of 1 GPa or more and a film thickness of 1 μm or more, wherein the product of the Young's modulus in the longitudinal direction and the thickness is 5 GPa·μm or more and 20 GPa·μm or less and wherein a dimensional change in the film longitudinal direction is −2% or more and +2% or less when the film is heated at a rate of 5° C./min under a load of 2 kg/mm2 applied in the longitudinal direction and the temperature has reached 110° C., the resin film satisfying at least either of the following (1) or (2): (1) the Young's modulus in the film longitudinal direction is 6 GPa or less and the film thickness is 4.5 μm or less; and (2) the Young's modulus in the film longitudinal direction is 4 GPa or less and the film thickness is 6 μm or less.