JPH0530372Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the improvement of electrical circuit patterns formed by gravure printing, and in particular to the structure of the pattern portion arranged approximately parallel to the doctor blade edge line. relates to an improved electrical circuit pattern.

[Prior Art] FIG. 2 is a schematic cross-sectional view for explaining the gravure printing method that is the background of the present invention. usually,
In the gravure printing method, a plate cylinder 1 is used, on which characters, figures, and symbols to be printed are engraved as a plate pattern.
is rotated within a container 3 in which printing ink 2 is stored. As the plate cylinder 1 rotates in the direction of arrow A, printing ink 2 is deposited on the surface of the plate cylinder 1. Plate cylinder 1
, the printing substrate 4, which is the object to be printed, is pressed against the impression cylinder 5, and the rotation of the impression cylinder 5 and the plate cylinder 1 moves the printing substrate 4 in the direction of the arrow B shown in the figure. , a printing 6 is applied to the surface in contact with the plate cylinder 1.

By the way, since the printing ink 2 adhered to the surface of the plate cylinder 1 is an intaglio plate, before the reaction 1 contacts the printing substrate 4 as shown in the figure, the printing ink 2 attached to the surface of the printing cylinder 1 is transferred to the doctor blade attached to the doctor blade device 7. It is configured so that the excess printing ink is removed by scraping with a blade 8.

Conventionally, when an electric circuit pattern is formed by the above-mentioned gravure printing method, a doctor blade 7 is used, so a phenomenon called "weeping" or "print covering" has occurred. This "bleeding" is, for example, a shadow-like shadow of printing ink that appears on the opposite side of the printing substrate with respect to the traveling direction D, as shown by the arrow X in the printed figure "A" shown in FIG. It refers to dirt.
Moreover, "plate covering" refers to stains that occur in a halftone-like state on the side opposite to the traveling direction D of the printing substrate, as shown by the hatched portion Y in FIG.

When "weeping" and "plate covering" occur, the appearance of ordinary printed matter is significantly impaired. However, in electrical circuit patterns formed by gravure printing, this "weeping" and "print covering" cause more serious problems.

That is, in the electric circuit pattern 12 formed on one side of the planar heating element 11 shown in FIG.
If "weeping" or "plate covering" occurs, a short circuit or the like will occur. Normally, in the gravure printing method, a large number of electrical circuit patterns 12 are continuously formed on the printing substrate, so if such "weeping" or "plate covering" occurs, the electrical circuits produced in a series of processes will be damaged. All of the circuit patterns 12 become defective products. In particular, in a planar heating element as shown in FIG. 4, the electric circuit patterns 12 are usually arranged extremely densely as shown in the figure in order to utilize the area effectively. Therefore, there was an even stronger need to resolve the issue of ``crying'' or ``print reversal.''

By the way, as described above, "weakness" and "plate covering" occur in the pattern portion in the direction perpendicular to the direction of travel of the printing substrate, that is, in the electrical circuit pattern 12 shown in FIG. Easy to occur. This is thought to be due to the impact or vibration caused when the doctor blade is separated from the plate mold, causing "weeping" or "plate covering".

Therefore, as disclosed in Japanese Patent Publication No. 58-30785, by not providing a part parallel to the edge line of the doctor blade in the electric circuit pattern, "creeping" and "print covering" can be solved. It is proposed that.

[Problems to be solved by the invention] According to the method disclosed in Japanese Patent Publication No. 58-30785, it is certainly possible to eliminate "bleeding" or "print covering" to some extent. however,
In exchange, it had the drawback of being prone to problems called ``doctor muscle''.

FIG. 5 is a partially cutaway plan view for explaining this "doctor streak" phenomenon. The electric circuit pattern 13 shown in FIG. 5 is not formed in a direction perpendicular to the traveling direction D of the printed substrate, that is, in a direction parallel to the edge line of the doctor blade. Therefore, the above-mentioned phenomena of "crying" and "print printing" hardly occur. However, an apex 13a is formed at the portion where the doctor blade leaves the printing form last. Fifth
In the electric circuit pattern 13 shown in the figure, such a vertex 13a is formed because a portion parallel to the edge line of the doctor blade is not provided. Therefore, when the doctor blade comes into contact with the printing plate corresponding to the electric circuit pattern 13 shown in FIG. 5, the doctor blade finally leaves the printing plate at the apex 13a.

By the way, printing ink usually contains a considerable amount of solid fine particles such as dust. This type of fine particles may be gathered by the doctor blade as it passes through the electrical circuit pattern 13, and as a result may prevent the doctor blade from smoothly separating from the printing form at the apex 13a. This appears as a phenomenon in which the doctor blade vibrates at a portion corresponding to the apex 13a and momentarily lifts off the printing form. As a result, "doctor streaks" as shown at 14 in FIG. 5, which are parallel to the traveling direction of the printing substrate, are generated.

Since the "doctor streaks" 14 are caused by the above-mentioned phenomenon, their length is usually much longer than the conventional problems of "crying" or "print printing." Therefore, when "doctor streaks" occur, for example, in the electric circuit pattern 12 as shown in FIG. 4, short circuits and the like are more likely to occur. Therefore, although it is important to eliminate "bleeding" and "print printing," it can be said that preventing the occurrence of "doctor streaks" is an even more important problem.

Therefore, the purpose of this invention is to improve the electrical circuit pattern formed by gravure printing.
To provide an electric circuit pattern capable of reliably eliminating disadvantages caused by "bleeding", "print covering" and "doctor streaks".

[Means for solving the problem] This invention was made to solve the above-mentioned problem, and its gist is that it is an electric circuit pattern formed by the gravure printing method. This electrical circuit pattern is characterized in that a pattern portion extending in a direction intersecting at least one doctor blade edge line is formed in a pattern portion arranged substantially parallel to a doctor blade in printing. This pattern part is arranged "substantially parallel", so
It is sufficient that the pattern portion as a whole is arranged parallel to the doctor blade, and since the missing part extends in a direction intersecting the doctor blade edge line, the pattern around the missing part should be arranged so as to intersect with the doctor blade edge line. ing.

[Function] In this invention, since a pattern missing part is provided that extends in a direction that intersects the edge line of the doctor blade, the area around the missing part, especially the front and back (front and back is based on the traveling direction of the printing substrate), is provided. Two or more pattern portions are provided in the direction of the pattern.
Therefore, the doctor blade passes over the plate cylinder while straddling both the pattern parts before and after the pattern missing part, and as a result, the pattern part that exists in front of the pattern missing part "bleeds". , "plate overprint" and "doctor's streaks" are not observed.

[Explanation of Examples] Examples of this invention will be described below.

FIG. 1 is a partially cutaway plan view showing an electric circuit pattern of a first embodiment of this invention. In this electric circuit pattern 21, parallel pattern parts 21a and 21b are formed in a direction parallel to the printing substrate, and a pattern is arranged substantially parallel to a doctor blade that connects the parallel pattern parts 21a and 21b. A portion 22 is provided. A pattern missing portion 23 is formed in the pattern portion 22 and extends in a direction intersecting the edge line of the doctor blade. Since the missing portion 23 is formed as described above, there is a front pattern portion 24 in front of the missing portion 23 (the front refers to the direction in which the printing substrate travels).
and a rear pattern section 25 are provided.

In the embodiment shown in FIG. 1, as described above, the cutout portion 23 is formed in the pattern portion 22 that is arranged approximately parallel to the doctor blade, so that the plate mold corresponding to the electric circuit pattern 21 is formed. Even if the edge line of the doctor blade reaches the terminal end 24a of the front pattern portion 24 when the doctor blade comes into contact with the ink and scrapes the ink,
As shown by the one-dot chain line E, the edge line of the doctor blade also extends over the rear pattern portion 25. Therefore, the edge line of the doctor blade is at the final end 2, as shown by the dashed line E.
It is supported not only at the points 4a but also at the points where the rear pattern portion 25 intersects with the dashed line E (there are two points). Therefore, even if fine particles contained in the printing ink are caught by the doctor blade at the end 24a,
The repelling of the doctor blade caused by the fine particles is
Since it is absorbed at the point of contact with the rear pattern portion 25, "doctor streaks" do not occur at the final end 24a, and "bleeding" and "print covering" are less likely to occur.

Therefore, according to the embodiment shown in FIG.
It is possible to reliably prevent the occurrence of "doctor streaks" and also eliminate the negative effects of "bleeding" and "print covering".

Note that this invention is not limited to the embodiment shown in FIG. 1, but can be realized as electrical circuit patterns of various shapes as shown in FIGS. 6 to 10.

That is, in the embodiment shown in FIG. 6, two pattern missing parts 23a and 23b are provided, and in the embodiment shown in FIG. ,21
b is wider than the distance between the respective outsides of b.

In addition, in the embodiment shown in FIG. 8, the width becomes wider as it approaches the final end 225a of the rear pattern portion 225, so that the printing ink is pushed to both sides as it approaches the final end 225a. The possibility of "weeping" and "print printing" occurring is further reduced.

In the embodiment shown in FIG. 9, two pattern missing portions 123a and 123b are provided side by side in the printing substrate traveling direction, so that two rear pattern portions 25a and 25a are located behind the front pattern portion 24. 25b
is formed.

The embodiment shown in FIG. 10 is a modification of the embodiment shown in FIG. 9, and here four pattern missing parts 123c, 123d, 123e, and 123f are provided.

[Effects of the invention] As described above, according to this invention, in the electrical circuit pattern formed by the gravure printing method, at least one doctor blade is placed in the pattern portion that is arranged approximately parallel to the edge line of the doctor blade. Since a pattern missing part is formed that extends in the direction that intersects the edge line of the blade, it is possible to reliably prevent the occurrence of so-called "doctor streaks", and also to prevent the occurrence of so-called "doctor streaks", which are also called "bleeding" and "print covering". It becomes possible to effectively eliminate the disadvantages caused by the printing defect phenomenon.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing an embodiment of this invention. FIG. 2 is a schematic partial sectional view for explaining the gravure printing method. FIG. 3 is a plan view showing "bleeding" and "print covering" in printing. FIG. 4 is a plan view showing an example of an electric circuit pattern to which this invention is advantageously applied.
FIG. 5 is a partially cutaway plan view showing an example of a conventional electric circuit pattern. FIG. 6 is a partially cutaway plan view showing the electric circuit pattern of the second embodiment of this invention. FIG. 7 is a partially cutaway plan view showing a third embodiment of this invention. Figure 8 shows
FIG. 7 is a partially cutaway plan view showing a fourth embodiment of this invention. FIG. 9 is a partially cutaway plan view showing a fifth embodiment of this invention. FIG. 10 is a partially cutaway plan view showing a sixth embodiment of this invention. In the figure, reference numeral 21 indicates an electric circuit pattern, 22 indicates a pattern portion disposed approximately parallel to the doctor blade, and 23 indicates a missing portion of the pattern.

Claims (1)

[Claims for Utility Model Registration] An electric circuit pattern formed by a gravure printing method, which includes at least one doctor blade in a pattern portion that is arranged substantially parallel to the edge line of a doctor blade used in gravure printing. An electrical circuit pattern characterized by forming a pattern missing portion extending in a direction intersecting an edge line.