JPS587375A - Method of thermal transfer recording - Google Patents

Abstract

PURPOSE:To prevent the deterioration of printing quality due to the concentration of the wrinkles of an ink film by a very simple means by a method wherein a dummy picture is printed immediately before the printing of a necessary picture. CONSTITUTION:The dummy picture, having a straight line or a curved line gently sloping with respect to the feeding direction of a recording paper at least at a part thereof, is printed immediately before printing a main picture by the thermal transfer recording method. For an actual example, the dummy picture DG1, consisting of a rectangular triangle, and the dummy picture DG2, consisting of parallel lines with respect to a printing direction, are printed other than the main printing picture G1. By these printings, fine wrinkles on the ink film IF1 are concentrated into the direction of an arrow sign A1 along the oblique side of the dummy picture DG1 consisting of the rectangular triangle. The concentratins of the wrinkles are collected to an area E1 due to the dummy picture DG2 consisting of straight lines and the main picture G1 will never be influenced by the wrinkles even though any type of printing pattern is printed thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to preventing the deterioration of printed crystal quality due to wrinkles in the ink film that often occur in printing apparatuses employing the military recording method.

Conventionally, it is known that wrinkles in the interfilm in printing and marking devices that employ the natural transfer recording method are extremely harmful to obtaining good print quality. This change causes wrinkles on the surface of the ink.If these fine wrinkles concentrate in one place during printing, they become large wrinkles that significantly reduce the adhesion between the recording paper and the ink film and deteriorate the print quality.

Particularly when a wide ink film is used for recording with thermal transfer, concentration of the particles is likely to occur.

Figure 1 is an explanatory diagram of a conventional paper transfer recording device, showing an example of the phenomenon in which print quality deteriorates due to the concentration of wrinkles in the conventional paper transfer recording device.
, τHD1 is a twin-type S-I mill head 3P1 printer, xy1 is an image paper, and xyl is an ink film. The arrow indicates the direction in which 1 μl of recording paper is fed), and the interfilm 171 is also fed in the same direction at a constant speed. Nah! RPIK is transferred to In7 Moriki l1M paper on Interrail 5171. Figure 2 Expansion platen F1
The ink film 171Kti has fine wrinkles as shown in the explanatory diagram 'h' showing the state of the facing recording paper R11 and the interfilm Iv1 inserted between the recording paper R11 and the thermal head HD1. If the fine wrinkles are small enough, they can be crushed with pressure between the platen IFI and the ink film xr1 and the ink film xr1.
yl is in complete contact with ζζ as shown in Figure 3 (when a screen with two parallel straight lines Xsl and Xa2 is printed on the recording paper Ra1, the wrinkles on the interfilm x1pl immediately after printing are as shown in Figure 4) As shown in Figure 5, wrinkles remain between straight lines III and L2. Figure 5 shows an example of a printing screen that is prone to deterioration of print quality.
s * ” 4 vtl! This is the screen for printing on brass paper R A 1. The arrow indicates the direction in which the printing will proceed, and as the printing progresses, it will move back to the printing direction of straight line 13 and straight line -4. The distance gradually decreases and reaches 1 at the intersection of straight line -3 and straight line 14.
1K. This and mi+ls, which disappears at the start of turtle printing,
l [The fine wrinkles in the ink film 11 that existed between the distances L4 and D10 are gradually reduced due to the decrease in the distance perpendicular to the printing direction between the straight line L3 and the straight line -4. concentrate. Figure 6 is an explanatory diagram of the concentration of wrinkles that occurred on the interfilm 1711 near the intersection of the straight line -3 and the straight lines X and 4. It has significantly decreased to the 9th place. FIG. 7 shows the printing wWt shown in FIG. 5, which was actually printed in the same manner as the number of prints). Printing defects 81 were caused by concentration of wrinkles.

In order to prevent deterioration of print quality due to wrinkles in the interfilm, a method has been proposed in which the width of the Ishita film recording paper is sufficiently narrow and the paper is fed obliquely to the direction of feeding. However, this method has the disadvantage that since the paper feeding direction and the ink film feeding direction are different, two types of mechanisms with different feeding speeds are required, making the mechanism complicated.

In order to eliminate these drawbacks, the first
As shown in the figure ``Conventional (known) without changing the known Fung-Maru transfer recording device, just need/me screen''&
This paper proposes a method to prevent the deterioration of print quality due to the concentration of wrinkles in the ink film by an extremely simple method of making Km characters just before one screen.

FIG. 8 shows one advantageous embodiment of the present invention.6b
, In addition to the main printing screen G1, there is a right-angled triangle)/1 screen ne1 and the sum of the printing directions and parallel straight lines are lmy@Hne2>, +wr screen @l, dll-i
1m! 1) G 1, / on one screen! 1G31 Figure 1 -
When printing with a multi-transfer device, inter-imm x 1
A dummy 111 with fine wrinkles on top of the right triangle.
) Wrinkles are concentrated along the oblique side of Gl in the direction of arrow M1. *The concentration of wrinkles is a straight line) Dummy screen 1) G2
Gather in Area 11. This allows the main screen G
No matter what kind of printing pattern is printed on 1, there will be no effect of wrinkles, and therefore no deterioration of printing quality will occur.
That is, the present invention is intended to prevent deterioration of printing quality by forcibly concentrating bt on a dummy screen and isolating this from the main screen.

The shape of the dummy screen to be printed immediately before the required screen is not limited as long as it has a gentle slope in the printing direction. Although not necessarily necessary, it is extremely effective if it exists.

As described above, the present invention provides a dummy screen having a gentle gradient in the printing direction immediately before the main m-plane, without changing the structure of the conventionally well-known thermal transfer image recording device. By printing, the wrinkles of the ink film are concentrated in a different area from the area where the main picture is printed.
1. It is possible to prevent deterioration of print quality due to the concentration of wrinkles on the ink film.

[Brief explanation of the drawing]

Figure 1 is conventional) (known %/% Description of a single transfer recording device ■, 111 g411 Figure 6 A clear diagram of wrinkles that occur on the interfilm, Figure 3, Figure 6) Figure 6 is an example of a printed irises surface, Figure 1 is a printed sample with defective line printing, and Figure 8 is an example of a printed screen with a /1 screen according to the present invention.Te HD100. Paper x y 1, ... Ink film a10. Main screen pel, nel, ..., dummy screen → 00. Recording paper feeding direction → 00. Printing direction and above Applicant Daini Seikosha Co., Ltd. Agent Patent Attorney Mogami

Claims (1)

[Claims] Interfilm tIll is made by applying ink with a low melting point onto a thin sheet metal! Immediately before the main image tube is printed, in the case where a transfer record is obtained by overlapping the image paper with a thermal head and heating it, at least a part of the recording paper is straight with a gentle slope in the feeding direction of the record paper. or print a dummy screen with white lines.
#Nermal transfer recording method with characteristics.