JP2008162234A - Wiping roller for intaglio printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiping roller for an intaglio printing machine which improves the printing performance in comparison with a conventional wiping roller for an intaglio printing machine, has the life prolonged, and enables the indirect check of the condition of contact of an intaglio surface with a roller easily visually. <P>SOLUTION: The wiping roller for an intaglio printing machine the axial core of which is covered with at least one or more rubber layers and/or resin layers is characterized by containing a temperature indicating pigment in at least a part of the surface of the wiping roller. Especially, the temperature indicating pigment uses a reversibility temperature indicating pigment. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a wiping roller used in an intaglio printing machine, and more particularly to a wiping roller that contributes to stable product quality and is excellent in long-term use.

As a wiping roller for an intaglio printing press, a rubber roller in which a nitrile rubber (NBR) is coated on an upper layer of a metal core that is a shaft body, or a resin roller in which soft polyvinyl chloride (PVC) is coated is used. These rollers are excellent in moldability, oil resistance, and viscoelasticity, but are in pressure contact with the intaglio surface mounted on the intaglio cylinder, and the surface is generated by frictional heat generated when wiping off excess ink on the intaglio surface. Hardness decreases and wears out. This wear is affected by the shape of the image line on the intaglio surface and occurs non-uniformly, so that it becomes impossible to wipe off the excess ink stably over time, resulting in a printing failure. In general, the wiping roller is suspended in a wiping tank in which the cleaning liquid stays, and is operated to operate a handle having a screw mechanism on both sides (left and right) of the roller, thereby adjusting and supporting contact with the intaglio plate surface.

In order to improve the wear of the wiping roller for intaglio printing presses, on the material side, a wiping roller in which metal oxide is added to PVC paste resin as an alternative material is used, and the ink scraping property that could not be obtained with the conventional wiping roller, Some improve durability. In this case, the printing characteristics are slightly improved by the metal oxide contained, but since the roller base material is a polyvinyl chloride resin material, wear occurs as in the case of a conventional wiping roller, and time elapses. At the same time, the ink on the wiping roller cannot be completely wiped off, and the remaining ink adheres to the printed matter. Cause a print failure.

On the other hand, as a measure for suppressing the wear of the wiping roller, it is one of the important factors to uniformly contact the opposing intaglio surface as well as to improve the material used for producing the roller. If the wiping roller is in non-uniform contact with the intaglio surface, the surface of the wiping roller becomes uneven, which causes a printing failure. In order to suppress this printing failure in advance, the operator has been forced to sufficiently monitor the surface of the printed product and the wiping roller. In order to achieve uniform contact with the intaglio surface of the wiping roller, the operator sometimes uses a non-contact type thermometer (for example, made by Keyence Co., Ltd., IT2-80) on the roller surface, Measurement is performed and the measurement temperature is relatively higher than the other locations, and the contact of the location that seems to be in excessive contact is released, and the operator must constantly monitor the roller as the wiping roller pressure adjustment work. Therefore, it is in a state that must be frequently adjusted, and is extremely inefficient.

Further, as time passes, the wiping roller wears mainly at the portions that come into contact with the area on which the pattern of the intaglio surface is applied, and thus wears unevenly. In order to suppress uneven wear, the wiping roller generally reciprocates in the axial direction. However, it is difficult to completely suppress uneven wear. Also, heat is prominent in the vicinity of the drive unit that mainly drives the rotation of the roller, and the roller is likely to thermally expand, so that uniform contact of the roller with the intaglio surface becomes increasingly difficult. In this case, the operator temporarily confirms the contact state between the desired intaglio surface and the roller by interrupting printing, applying ink to the entire intaglio surface, and wiping off. In addition, when an abnormality due to unevenness on the roller surface is confirmed during printing, the printing machine is stopped, the roller surface is polished and smoothed, and then reused. As a wiping roller for an intaglio printing press that solves these problems, abnormalities that occur in the wiping roller are visually displayed, and by using this, printing abnormalities that occur can be confirmed instantaneously, and the intaglio surface and the roller There has been a demand for a wiping roller that achieves proper pressing and, as a result, can be used for life extension.

The wiping roller for an intaglio printing machine is a wiping roller for an intaglio printing press in which at least one rubber layer or a resin layer is coated on the shaft core, and the entire surface layer or a part of the wiping roller is made of titanium oxide. There is a wiping roller made of blended rubber and / or resin (for example, see Patent Document 1).

JP 2006-231750 A

According to the invention of Patent Document 1 described above, the cleaning liquid appearing on the roller surface can be easily distinguished by coloring the wiping roller (for example, white), and the above-described printing troubles such as “wiping residue” and “solvent stain” are effective. Therefore, it is possible to improve the printing performance as compared with the conventional intaglio printing wiping roller and to extend the life. However, even if an abnormality on the surface of the wiping roller can be confirmed instantaneously, it is not possible to regulate uneven contact or excessive contact of the wiping roller with respect to the intaglio surface, and a certain effect can be obtained in suppressing paper loss. However, the life extension of the roller cannot be realized by continuously obtaining a high-quality printed product and realizing proper contact of the wiping roller with the intaglio surface.

In addition, the wiping roller does not deteriorate with the passage of time, and eventually the roller surface becomes uneven and a defect occurs. In order to suppress this, the wiping roller is pressed more strongly against the intaglio surface, which promotes partial wear, resulting in the product quality obtained and life extension of the roller used. I can't be satisfied. At this time, the degree of pressing of the wiping roller against the intaglio surface often depends on the skill of the operator, and there is variation due to the ability of learning. Sometimes the pressure is not appropriate and the residual ink or dirty cleaning liquid that appears on the roller surface from the recesses that appear on the roller may adhere to the printed matter and generate a large amount of waste paper, in order to suppress these abnormalities in advance, It was essential to replace the rollers at an early stage.

Patent Document 1 described above is excellent in detecting abnormalities appearing on the surface of the wiping roller, but cannot exert its effect in adjusting the pressure on the intaglio plate surface during printing. Therefore, it is not necessarily widely used as a wiping roller for an intaglio printing press. There is a current situation that is not generally used. Considering the various problems described above, there has been a considerable room for development of the wiping roller for intaglio printing presses.

In order to solve the above problems, the present invention improves printing performance and extends the life of conventional wiping rollers for printing presses, and easily and indirectly confirms the contact state between the intaglio surface and the rollers. The present invention provides a wiping roller for a printing press that contributes to the stability of product quality and is excellent in long-term use.

In order to solve the above-mentioned problems, a wiping roller for an intaglio printing press according to the present invention is a wiping roller for an intaglio printing press in which at least one rubber layer and / or resin layer is coated on the shaft core. A temperature pigment is contained in at least a part of the surface layer.

Further, the wiping roller for an intaglio printing press according to the present invention is a wiping roller for an intaglio printing press in which at least one rubber layer and / or a resin layer is coated on the shaft core, and the discoloration occurs on at least a part of the surface layer of the wiping roller. It contains a plurality of temperature indicating pigments having different color tones depending on the temperature range.

The wiping roller of the present invention contains 10 to 40% by weight of the temperature indicating pigment.

Further, the temperature pigment contained in the wiping roller of the present invention is a reversible temperature pigment.

Further, the wiping roller of the present invention has a roller surface layer containing a temperature indicating pigment at a portion that comes into contact with an image area, which is an area on which an opposing intaglio surface pattern is applied.

The wiping roller for an intaglio printing press according to the present invention can easily check the contact state of the wiping roller with respect to the intaglio surface by observing the roller surface. Produces the effect that it can be produced.

In addition, the wiping roller of the present invention can suppress wear and tear due to the uneven contact of the roller, so that it can be used for a longer life than the conventional wiping roller, and the cost of the wiping roller can be reduced. .

In addition, by using the wiping roller of the present invention, it is possible to reduce the contact pressure (pressing) adjustment between the fine intaglio surface and the wiping roller, and to extend the life of the roller. Since the frequency of replacing the wiping roller, which has been frequently carried out in the past, can be greatly reduced, there is an effect that the downtime caused by the roller replacement can be shortened and the labor for the operation can be simplified.

Furthermore, the wiping roller of the present invention eliminates the disadvantages that occur in conventional wiping rollers for intaglio printing presses, can realize stable roller pressing against the intaglio surface, has sufficient durability in use of the roller, and print quality. There is an effect that does not decrease.

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of a wiping roller according to the present invention. FIG. 2 is a schematic view when viewed from another direction, and FIGS. 3 and 4 are schematic views of another embodiment of the wiping roller according to the present invention. FIG. 5 shows an example of a general wiping roller, and FIG. 6 shows an example of a general intaglio printing machine.

As shown in FIG. 5, a general wiping roller (6) has a bakelite (4) as an intermediate layer wrapped around a metal shaft core (2), and a rubber layer and / or an upper layer having an effective diameter suitable for wiping. Alternatively, it is formed by winding a resin layer (5) (for example, PVC) and polishing the surface. Here, PVC is exemplified as the surface layer material, but it is possible to change to rubbers such as ebonite, vinyl chloride, nitrile rubber, or other resins (thermoplastic resin, thermosetting resin), or to use them in multiple layers. In some cases. Furthermore, a urethane resin or a metal oxide may be included.

In the wiping roller (1) of the present invention shown in FIGS. 1 and 2, a bakelite (4) as an intermediate layer is wound around a metal shaft core (2), and a temperature indicating pigment is contained in at least a part of the surface layer. The rubber layer and / or the resin layer (3) are wound until an effective diameter suitable for printing (for example, Φ325.0 mm), repeated firing, and finally subjected to surface polishing to form a wiping roller for an intaglio printing press. ing.

Further, as shown in FIG. 3, the wiping roller (1) of the present invention comprises a rubber layer containing a temperature pigment and / or a resin layer (3) in each region and a rubber layer not containing the temperature pigment. And / or it may be set as the form which has at least 2 area | region of the area | region which provided the resin layer (5). In addition, as shown in FIG. 4, the intermediate layer (4) is not provided on the shaft core (2), and a rubber layer and / or a resin layer (3) containing a temperature indicating pigment may be directly wound. is there.

An example of implementation of the wiping roller for an intaglio printing press according to the present invention will be described with reference to FIGS. 1 to 4 and FIG. As shown in FIGS. 1 and 2, the wiping roller (1) according to the present invention covers the shaft core (2) with the bakelite (4) as an intermediate layer, and the upper layer is coated with the temperature indicating pigment on at least a part thereof. It is the specification which coat | covered the contained rubber layer and / or resin layer (3). The wiping roller (1) is suspended in a wiping tank (9) in which the cleaning liquid (8) shown in FIG. 6 is retained, and is brought into contact with the opposing intaglio surface (7), thereby wiping off excess ink on the intaglio surface (wiping). Work).

The wiping roller (1) of the present invention is repeatedly applied and fired by a wiping roller molding application mechanism (Japanese Patent No. 3215833), which is a paste containing thermochromic, which is a thermochromic pigment, in PVC paste or NBR paste. Can be produced. Thermochromic has a particle size of about 0.5 μm and can be easily mixed with PVC paste or NBR paste. Further, even when the roller is formed, thermochromic particles do not rise on the surface.

In this example, the content of thermochromic in the PVC paste or NBR paste is 20% by weight. Here, when the content of the thermochromic is small (for example, 10% by weight), when the wiping roller is in contact with the intaglio surface, the appearance of the visual effect on the surface color change is not clear, whereas the thermochromic If the content of A is large (for example, 40% by weight), not only the oil resistance properties of PVC or NBR are deteriorated, but also the tensile strength is lowered, and further viscoelastic properties may be impaired. It's not a good idea.

Since thermochromic is generally an expensive material, when it is used as a wiping roller, the roller may be multi-layered and used only for the uppermost layer. If a thermochromic type (for example, blue colored thermochromic pigment; blue thermochromic) is used, it is easy to distinguish it from the cleaning liquid (8) and residual ink, and the intaglio surface (7) contacts the wiping roller. At the same time as the confirmation of the state, there may be a specification that can presume printing troubles such as the cleaning liquid (8) rising on the roller surface and adhesion of residual ink.

In addition, as shown in FIG. 3, the wiping roller (1) of the present invention has a temperature-indicating pigment in the portion that comes into contact with the plate surface area (non-image area) where no pattern is applied. In some cases, the rubber layer and / or the resin layer (3) are not used. Further, the wiping roller (1) of the present invention may contain a plurality of temperature indicating pigments having different color tones from the discoloration temperature region.

Further, as shown in FIG. 4, the wiping roller (1) of the present invention may have a form in which a rubber layer and / or a resin layer (3) containing a temperature indicating pigment is directly wound around the shaft core (2). is there. In this case, it becomes a single-roll roller specification, and it can be repeatedly used for printing by polishing the worn portion and correcting it to a flat state. Further, although an irreversible temperature indicating pigment may be used as the temperature indicating pigment, it is advantageous to use a reversible temperature indicating pigment in order to confirm the surface temperature of the wiping roller in real time during printing.

As a result of using the wiping roller (1) of the present invention in an intaglio printing press, the degree of heat generation could be sufficiently estimated by the surface color appearing on the wiping roller in contact with the intaglio surface (7). It was confirmed that the surface temperature of the wiping roller in this example was around 60 ° C. The quality of the printed matter at the time of printing was good and stable. When a general wiping roller (6) is used, unevenness appears remarkably on the surface after printing of 100,000 sheets of paper, whereas it was difficult to print judging from the quality aspect, The wiping roller (1) of the present invention hardly deteriorates the print quality even when printing about 400,000 sheets of paper.

Further, since the wiping roller (1) of the present invention can estimate the heat generation state, it is possible to suppress the uneven contact of the wiping roller to the intaglio surface (7) and to significantly suppress the uneven wear of the wiping roller, thereby extending the life. Use was realized. In addition, by observing the color development state on the roller surface, it is possible to maintain the proper contact state of the wiping roller with respect to the intaglio surface (7) even if an operator who does not have the ability to perform wiping works. Therefore, it was possible to suppress the occurrence of damaged paper (defective paper). Furthermore, the frequency of adjustment and replacement of the wiping roller has been reduced, and workability has been greatly improved.

As mentioned above, although this invention was demonstrated, this invention is not limited to an Example, It cannot be overemphasized that all the embodiments exist in the range described in the claim. For example, it is only necessary that the temperature indicating pigment is contained in the surface layer of the wiping roller (1), and the case where the intermediate layer has various rubber layers and / or resin layers is also included in the claimed scope.

It can also be easily assumed that the surface color of the wiping roller of the present invention is detected by an optical measuring device, and the pressing management of the roller against the intaglio surface (7) is realized based on the obtained data.

It is the schematic which shows the wiping roller which concerns on this invention. It is the schematic when it sees from another direction of the wiping roller which concerns on this invention. It is the schematic which shows the wiping roller of another form which concerns on this invention. It is the schematic which shows the wiping roller of another form which concerns on this invention. It is the schematic which shows an example of a general wiping roller. It is the schematic which shows an example of a general intaglio printing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wiping roller of this invention 2 Axle core 3 Rubber layer and / or resin layer 4 containing temperature indicating pigment 4 Intermediate layer (for example, bakelite)
5 Rubber layer and / or resin layer (for example, PVC)
6 General wiping roller 7 Intaglio cylinder (intaglio surface)
8 Cleaning liquid 9 Wiping tank

Claims (5)

A wiping roller for an intaglio printing press in which at least one rubber layer and / or resin layer is coated on a shaft core, wherein the intaglio plate contains a temperature indicating pigment in at least a part of a surface layer of the wiping roller. Wiping roller for printing press. In the wiping roller for an intaglio printing press in which at least one rubber layer and / or resin layer is coated on the shaft core, at least a part of the surface layer of the wiping roller has a plurality of temperature indications having different color tones according to the color change temperature region. A wiping roller for an intaglio printing press characterized by containing a pigment. The wiping roller for an intaglio printing press according to claim 1 or 2, wherein the wiping roller contains 10 to 40 wt% of the temperature indicating pigment. 4. The wiping roller for an intaglio printing press according to claim 1, wherein the temperature indicating pigment contained in the wiping roller is a reversible temperature indicating pigment. 5. The intaglio according to claim 1, wherein the wiping roller has a roller surface layer containing the temperature pigment at a location in contact with an image area which is an area on which an intaglio surface is provided. Wiping roller for printing machine.

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