Method of making a coated tape,and particularly smooth surface magnetic recording tape
Abstract
Abstract TO IMPROVE THE SMOOTHENESS OF THE SURFACE OF COATED TAPE, PARTICULARLY COATED MAGNETIC RECORDING TAPE, A THIN FILM (E.G., 0.02 MM. THICK) OF POLYETHYLENE IS APPLIED ON TOP OF THE WET COATING OF MAGNETIC PARTICLES (E.G., IRON OXIDE PARTICLES), IN A BINDER, AND SOLVENT, THE SOLVENT EVAPORATING THROUGH THE POLYETHYLENE FILM. WHEN THE SOLVENT HAS EVAPORATED, OR ALMOST SO, THE POLYETHYLENE FILM IS STRIPPED OFF THE COATING, LEAVING A SMOOTH GLOSSY SURFACE HAVING IMPROVED ABRASION RESISTANCE AND REPRODUCTION CHARACTERISTICS. TYPICAL DRYING CONDITIONS ARE ABOUT 21*C., AND 45 MINUTES; THE COATING MAY BE BRIEFLY PREDRIED BUT ONLY FOR SO LONG THAT THE POLYETHYLENE FILM CAN STILL MOLD THE SURFACE OF THE COATING TO BE FLAT DURING THE DRYING PROCESS.
Inventors
- 👤 G Hungerford
Bibliographic Details
Claims Analysis
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