Magnetic Recording Burnishing Tape Vacuum Treatment for Surface Defects
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Solution Overview
Problem
The productivity of magnetic recording media is hindered by defects such as scratches and dirt on the surface caused by loose abrasive grains generated during the burnishing process due to pressure from winding tension in the roll form of abrasive tapes.
Innovation Solution
Subjecting the abrasive tape in roll form to vacuum treatment before use to reduce loose abrasive grains, followed by rewinding to further minimize defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If abrasive tape is wound in roll form for burnishing, then productivity is improved through continuous processing, but loose abrasive grains are generated due to winding tension causing scratches and dirt
Solution Approach 1:
The abrasive tape is subjected to vacuum treatment before the burnishing process to remove loose abrasive grains in advance. This preliminary action prevents the generation of defects during the actual burnishing operation while maintaining the benefits of roll-form continuous processing.
Solution Approach 2:
Vacuum treatment creates an inert environment that removes loose abrasive grains from the abrasive tape before use. This prevents the harmful effect of loose grains causing scratches and dirt on the magnetic recording medium surface.
2Manufacturing precision
If abrasive tape is pressed against the surface for burnishing, then surface smoothness is improved, but scratches and dirt are caused by loose abrasive grains
Solution Approach 1:
Vacuum treatment is performed before burnishing to remove loose abrasive grains that would cause scratches and dirt. This preliminary cleaning action ensures that only firmly bonded abrasive grains remain to perform the burnishing function.
Solution Approach 2:
Loose abrasive grains are extracted from the abrasive tape through vacuum treatment before the burnishing process. This separation removes the harmful elements while retaining the useful burnishing function of the firmly bonded grains.
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
Reduces the occurrence of defects, enhancing the productivity and quality of magnetic recording media by minimizing scratches and dirt, thereby improving reliability and maintaining high recording density.
Implementation Method 1
The abrasive tape in the state of being wound in the roll form is subjected to vacuum treatment in advance such that loose abrasive grains are reduced
Data Source
AI summary
A method of manufacturing a magnetic recording medium includes burnishing, with an abrasive material, a surface of a stack including a magnetic recording layer and a protective layer stacked on a substrate in order of the magnetic recording layer and the protective layer. The burnishing of the surface of the stack includes using a long abrasive tape including abrasive grains as the abrasive material fixed onto a support in a state of being wound in roll form, and pressing the abrasive tape, supplied from the state of being wound in the roll form, against the surface of the stack so as to rub the surface of the stack. The abrasive tape in the state of being wound in the roll form is subjected to vacuum treatment in advance such that loose abrasive grains are reduced.