Magnetic Tape Cut Edge Roughness Control for Thin Substrates
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Solution Overview
Problem
Magnetic tapes with thin non-magnetic substrates face challenges in maintaining linear running performance and preventing flaking when used in high-speed linear serpentine type magnetic recording-reproducing systems due to frictional contact with guide rollers, which is exacerbated by poor cut edge smoothness and reduced flexural rigidity.
Innovation Solution
A magnetic tape with a non-magnetic substrate thickness of 4 μm or less, featuring a center line average height (Ra) of 0.08 to 0.25 μm on its cut edges, and optionally including a primer layer with an electron radiation curing resin, is produced using a cutting device with specific blade configurations to enhance cutting properties and reduce flaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the non-magnetic substrate is decreased to increase the length of magnetic tape per reel, then the storage capacity increases, but the flexural rigidity decreases and the tape becomes prone to deformation and flaking during high-speed feeding
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the non-magnetic substrate within the range of 2-4 μm and the center line average height of cut edges within 0.05-0.20 μm. This optimization of dimensional parameters allows the thin substrate to maintain sufficient flexural rigidity while maximizing storage capacity, resolving the contradiction between thinning the substrate and maintaining strength.
2Quantity of substance
If the thickness of the non-magnetic substrate is decreased to increase storage capacity, then more tape can be stored per reel, but the cut edge smoothness deteriorates and flaking occurs during frictional contact with guide rollers
Solution Approach 1:
The patent addresses cut edge smoothness by controlling the center line average height (Ra) to be 0.05-0.20 μm through optimized cutting parameters and blade configurations. This precise control of surface roughness parameter prevents flaking during frictional contact with guide rollers while maintaining the thin substrate thickness for high storage capacity.
Solution Approach 2:
The patent applies local quality by using different blade types (thin blades and thick blades) with specific surface roughness characteristics (Ra ≤ 0.05 μm) for cutting. The localized optimization of blade surface quality ensures smooth cut edges on the thin magnetic tape substrate, preventing flaking at the cut edges during high-speed feeding.
3Ease of manufacture
If conventional cutting methods are used on thin magnetic sheets, then the cutting process is simple, but the cut edges become rough and cause flaking during high-speed feeding
Solution Approach 1:
The patent maintains ease of manufacture by using conventional cutting device architectures but optimizes cutting parameters including blade intermeshing depth (0.05-0.1 mm), blade surface roughness (Ra ≤ 0.05 μm), and magnetic sheet tension control (fluctuation ≤ 100 μm). These parameter optimizations achieve smooth cut edges without complicating the overall cutting process.
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 achieves improved linear running performance and reduced flaking during high-speed feeding, maintaining smooth contact with guide rollers while minimizing stress concentration on cut edges.
Implementation Method 1
a primer layer with an electron radiation curing resin
Data Source
AI summary
A magnetic tape produced by cutting a magnetic sheet with a wide breadth into a tape having a predetermined width using a cutting device, in which the magnetic sheet has a magnetic layer containing magnetic powder and a hinder formed on one surface of a non-magnetic substrate having a thickness of 4 μm or less, and a center line average height (Ra) along a roughness curve of a cut edge of the magnetic tape is from 0.08 to 0.25 μm.