High-grade thermal recording sheet and a method of making the same
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United States of America Patent
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Sep 24, 1991
Issued Date -
N/A
app pub date -
Oct 23, 1989
filing date -
Jun 12, 1986
priority date (Note) -
Expired
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Abstract
A thermal recording sheet having on a support a thermal recording layer adapted for developing color when heated has an outermost surface layer formed by bringing it into contact with the surface of a smooth body when it is in a wet state, drying it and separating it from the surface of the smooth body. The sheet has a surface which is so smooth that when a first straight line extending in parallel to the centerline of a roughness curve as obtained in accordance with the method of JIS B0601 crosses the roughness curve with a contact ratio of 10%, a second straight line extending in parallel to the centerline and between it and the first straight line and having a distance of 1.5 .mu.m from the first straight line crosses the roughness curve with a contact ratio of at least 80%. The sheet is, therefore, easy to bring into intimate contact with a thermal head and is of high image quality and sensitivity. If the smooth body has a glossy or dull surface, it is possible to produce a thermal recording sheet having a uniformly glossy or dull surface without lowering its image quality of sensitivity.
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