Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1999-07-13
2000-12-12
Chen, Vivian
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428217, 428323, 428338, 428480, 4289033, 428910, 427146, 427148, B32B 2706, B32B 2718, B32B 2720, B32B 2736
Patent
active
061595799
DESCRIPTION:
BRIEF SUMMARY
TEHCNICAL FIELD
The present invention relates to a biaxially oriented polyester film for a transfer material (heat-sensitive transfer ribbon) for heat-sensitive transfer printer, more particularly it relates to a biaxially oriented polyester film giving little abrading action on mechanical parts in a printer and having extremely excellent windability not only in the winding of a roll in film manufacture but also in the slitting of the produced ribbon after the application of an ink layer and a back-coating layer. Especially, the present invention relates to a biaxially oriented polyester film applicable not only for a heat-sensitive transfer ribbon to perform the heat-transfer by the contact of an ink layer with an image-receptor but also for a sublimation-type heat-sensitive transfer ribbon to perform the heat-transfer printing in a non-contacting state of the ink layer and the image receptor.
BACKGROUND ARTS
Various printing systems were developed according to the progress of office automation. Heat-sensitive transfer recording system is attracting interest among these systems owing to its low noise-generation in printing and simple operation. In this system, an image-receiving member (e.g. common paper and plastic sheet) is placed as a transfer object at the side of hot-melt ink layer of a heat-sensitive transfer ribbon produced by placing a hot-melt ink layer on a base film, a thermal head is brought into contact with the heat-sensitive transfer ribbon at the side opposite to the ribbon, a thermal pulse is applied to the thermal head corresponding to a recording signal to melt the hot-melt ink layer at a specific position and the molten ink is transferred to the surface of the image-receiving member to record a letter or drawing.
A polyester film industrially available as a thin film and having excellent mechanical strength has been used as the base film constituting the heat-sensitive transfer ribbon.
Disclosed polyester films for heat-sensitive transfer ribbon include a film specifying the density of protrusions on the film surface (40 to 200/0.01 mm.sup.2 for protrusions having a diameter of 1 .mu.m or larger and smaller than 5 .mu.m and 400 to 2,000/0.01 mm.sup.2 for protrusions having a diameter of 0.5 .mu.m or larger and smaller than 1 .mu.m) and a protrusion height (0.10 to 0.50 .mu.m) (JP-A 62-299389 (hereunder JP-A means "Japanese Unexamined Patent Publication")), a polyethylene naphthalate film having a Young's modulus of 600 kg/mm.sup.2 or above in machine direction (JP-B 6-30881 (hereunder JP-B means "Japanese Examined Patent Publication")) and a film having a thermal dimensional change of 5% or less in transversal direction (Japanese Patent 2581270). These films have improved film slipperiness and heat-resistance in the case of using as a heat-sensitive transfer ribbon.
However, it has been clarified that the following two problems are inherent to the heat-sensitive transfer ribbons produced from these films.
The first problem is the generation of abraded powder by the friction of the heat-sensitive transfer ribbon with a printer part contacting with the heat-sensitive transfer ribbon in high-speed printing to cause defective print.
The second problem is the defective winding caused by the breakage and creasing of a heat-sensitive transfer ribbon in the slitting and winding of a broad raw film roll to the width of the product ribbon (hereunder called as slitting operation) in the process for the production of a heat-sensitive transfer ribbon.
There was no actualization of these problems even by using the above conventional films since the printing speed of conventional printer was slow, the manufacturing quantity of heat-sensitive transfer ribbon was small to dispense with the high-speed slitting process and the windability was ensured to an extent by the improvement of the winding condition of a slitter and the back coating layer and the ink layer of the film.
However, the solution of the above two problems became impossible by the use of conventional heat-sensitive transfer ribbon be
REFERENCES:
patent: 3980611 (1976-09-01), Anderson et al.
patent: 5478632 (1995-12-01), Kurz et al.
patent: 5595819 (1997-01-01), Anderson et al.
Mizutani Kei
Tomita Hiroshi
Chen Vivian
Teijin Limited
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