JP2016022713A - Photogravure offset printing apparatus and photogravure offset printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photogravure offset printing apparatus and a photogravure offset printing method, which enable a substrate to be printed efficiently with a smooth thick film.SOLUTION: A photogravure offset printing apparatus 1 includes: a supply part 11 to supply a printing paste P; a gravure roll 12 that is constituted of a smooth plate using a metal mirror surface as a surface 12a and receives a supply of the printing paste P from the supply part 11; a blanket roll 13 that receives the printing paste P from the gravure roll 12 and transfers the printing paste P onto a substrate; and a gap forming part 17 that forms a gap G between itself and the surface 12a of the gravure roll 12 and adjusts a thickness of the printing paste P on the surface 12a passing through the gap G.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gravure offset printing apparatus and a gravure offset printing method.

  As a decoration technique for imparting design properties to a product, for example, spray coating, water pressure transfer, thermal transfer, simultaneous molding decorative transfer system, simultaneous molding decorative insert system, and the like are known. In various industries, as the performance and functions of products increase, the demand for decoration technology as a means for differentiating increases. In recent years, not only application of design properties, but also decoration techniques have been developed for the purpose of providing surface functionality such as hard coating, fingerprint adhesion prevention, tactile performance, scratch repair, and electromagnetic wave shielding. The current mainstream film decoration has a problem in process efficiency because the film production process is indispensable and the amount of surplus film discarded cannot be overlooked. Therefore, the current situation is that spray coating, which is problematic in terms of environmental load, is still used.

  Further, for example, gravure offset printing is known as a decoration technique used for forming wiring patterns such as conductive circuits and electrodes used for various electronic components such as a touch panel. In general gravure offset printing, a gravure plate in which a concave portion corresponding to a desired printing pattern is formed, and a blanket cylinder whose surface is covered with silicone rubber or the like are used (for example, see Patent Document 1).

JP 2011-240570 A

  When a three-dimensional object having a three-dimensional shape is used as a decoration object, for example, pad printing is used. Pad printing is a method in which, for example, a printing paste is transferred from a flat plate on which a printing pattern is formed to a transfer body, and printing is performed on a substrate. Pad printing is suitable for partial printing such as logo-type printing, but has a problem that it is difficult to expand the printing area. In addition, decoration of a three-dimensional object by an ink jet method has been studied, but printing accuracy with respect to a printing speed and a shape having a height difference has been a problem.

  When the above-described gravure offset printing is studied as a decoration technique that can solve these problems, increasing the printing film thickness becomes a new problem. That is, in the conventional gravure offset printing apparatus, in order to increase the printing film thickness, it is necessary to form the concave portion of the gravure plate deeply or to repeat the printing a plurality of times, so that a smooth thick film is efficiently formed. It was difficult.

  SUMMARY An advantage of some aspects of the invention is that it provides a gravure offset printing apparatus and a gravure offset printing method capable of efficiently printing a smooth thick film on a printing material.

  In order to solve the above problems, a gravure offset printing apparatus according to one aspect of the present invention includes a supply unit that supplies a printing paste and a smooth plate having a metal mirror surface as a surface, and receives the supply of the printing paste from the supply unit. A gap is formed between the gravure plate, the blanket cylinder that receives the printing paste from the gravure plate and transfers it to the substrate, and the surface of the gravure plate, and the thickness of the printing paste on the surface passing through the gap is adjusted. A gap forming portion.

  In this gravure offset printing apparatus, the printing paste can be supplied to the surface of the gravure plate with an arbitrary thickness by the gap forming portion. Further, the gravure plate is constituted by a smooth plate having no recesses, and the surface of the gravure plate is a metal mirror surface. For this reason, even when the printing paste on the surface of the gravure plate is a thick film, the smoothness can be ensured satisfactorily, and a thick film with good smoothness can be printed on the substrate by one printing.

  Further, at least the surface of the blanket cylinder may be formed of rubber. In this case, by providing elasticity to at least the surface of the blanket cylinder, the smoothness of the thick film printed on the substrate can be enhanced.

  The rubber may have a hardness of 80 or less. In this case, the smoothness of the thick film printed on the substrate can be further enhanced.

Further, at the time of printing, the blanket cylinder may be pushed into the gravure plate with a pushing pressure at which the contact pressure becomes 0.5 N / cm ² or more. In this case, the smoothness of the printing paste delivered from the gravure plate to the blanket cylinder can be secured well. The contact pressure may be 1.0 N / cm ² or more, or 2.0 N / cm ² or more.

Further, at the time of printing, the substrate to be printed may be pushed into the blanket cylinder with a pushing pressure at which the contact pressure becomes 0.5 N / cm ² or more. Thereby, the smoothness of the printing paste transferred to the substrate can be ensured satisfactorily. The contact pressure may be 1.0 N / cm ² or more, or 2.0 N / cm ² or more.

  The printed material may be a three-dimensional object having a three-dimensional shape. Due to the above characteristics, a smooth thick film can be efficiently printed even when the object to be printed is a three-dimensional object.

  Further, the gravure offset printing method according to one aspect of the present invention uses a smooth plate having a metal mirror surface as a gravure plate that receives a supply of printing paste from a supply unit, and forms a gap between the surface of the gravure plate A gap is formed by the section, and after adjusting the thickness of the printing paste supplied from the supply section onto the surface of the gravure plate by passing the gap, the printing paste is transferred to the blanket cylinder and transferred to the printing material.

  In this gravure offset printing method, the printing paste can be supplied to the surface of the gravure plate with an arbitrary thickness by the gap forming portion. Further, the gravure plate is constituted by a smooth plate having no recesses, and the surface of the gravure plate is a metal mirror surface. For this reason, even when the printing paste on the surface of the gravure plate is a thick film, the smoothness can be ensured satisfactorily, and a thick film with good smoothness can be printed on the substrate by one printing.

  Further, at least the surface of the blanket cylinder may be formed of rubber. In this case, by providing elasticity to at least the surface of the blanket cylinder, the smoothness of the thick film printed on the substrate can be enhanced.

  Further, rubber having a hardness of 80 or less may be used as the rubber. In this case, the smoothness of the thick film printed on the substrate can be further enhanced.

Further, at the time of printing, the blanket cylinder may be pushed into the gravure plate with a pushing pressure that makes the contact pressure 0.5 N / cm ² or more. In this case, the smoothness of the printing paste delivered from the gravure plate to the blanket cylinder can be secured well. The contact pressure may be 1.0 N / cm ² or more, or 2.0 N / cm ² or more.

Further, at the time of printing, the substrate to be printed may be pushed into the blanket cylinder with an indentation pressure that provides a contact pressure of 0.5 N / cm ² or more. Thereby, the smoothness of the printing paste transferred to the substrate can be ensured satisfactorily. The contact pressure may be 1.0 N / cm ² or more, or 2.0 N / cm ² or more.

  The printed material may be a three-dimensional object having a three-dimensional shape. Due to the above characteristics, a smooth thick film can be efficiently printed even when the object to be printed is a three-dimensional object.

  According to the present invention, a smooth thick film can be efficiently printed on a substrate by gravure offset printing.

It is the schematic which shows the structure of the gravure offset printing apparatus which concerns on one Embodiment of this invention. It is the schematic which shows the process of the printing by the gravure offset printing apparatus shown in FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 3 is a diagram showing a step subsequent to FIG. 2. FIG. 5 is a diagram showing a step subsequent to FIG. 4. It is a figure which shows the result of the effect confirmation test of this invention.

Hereinafter, preferred embodiments of a gravure offset printing apparatus and a gravure offset printing method according to an aspect of the present invention will be described in detail with reference to the drawings.
[Configuration of gravure offset printing device]

  FIG. 1 is a schematic diagram showing a configuration of a gravure offset printing apparatus according to an embodiment of the present invention. As shown in the figure, a gravure offset printing apparatus 1 includes a printing unit 3 including, for example, a slide table 2 on which a printing material K is placed, a gravure roll (gravure plate) 12 and a blanket roll (blanket cylinder) 13 described later. And is configured.

  The slide table 2 is configured to be slidable in a substantially horizontal direction by driving means such as a ball screw 4. At the time of printing, for example, a pedestal 5 on which the substrate K is placed is arranged on the slide table 2. By driving the ball screw 4, the slide table 2 is conveyed at a predetermined speed from the front side of the printing unit 3 toward the back side. A pedestal receiving portion 6 is provided at the slide end position of the slide table 2. When the slide table 2 is driven to the slide end position, the pedestal receiving portion 6 picks up the pedestal 5 and the printing material K from the slide table 2.

  Further, the printing unit 3 is configured to be able to move up and down manually or automatically in a direction intersecting the driving direction of the slide table 2. A hood such as a curtain is installed around the printing unit 3 as necessary. Driving of the slide table 2 and driving of each roll in the printing unit 3 are controlled by a control unit (not shown).

  The to-be-printed object K may be a flat object such as a sheet or plate, or may be a three-dimensional object having a three-dimensional shape such as a three-dimensional curved surface. Examples of such a printing material K include various resin molded products such as interior / exterior parts for automobiles, parts for household electrical appliances, and parts for housing equipment.

  The printing paste P (see FIG. 2) used for printing on the printing material K is generated, for example, by stirring a mixture of resin, solvent, and the like with a three roll or the like. The resin is not particularly limited, and for example, acrylic resin, polyurethane resin, vinyl acetate resin, electron beam curable resin, aqueous acrylic emulsion resin, aqueous dispersion and the like are used. Examples of the solvent include toluene, xylene, ethyl acetate, normal butyl acetate, isobutyl acetate, normal propyl acetate, isopropyl acetate, ethylene glycol monobutyl acetate, propylene glycol monobutyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, Cyclohexanone, isophorone, isopropyl alcohol, normal butyl alcohol, isobutyl alcohol, ethylene glycol nomobutyl acetate, propylene glycol monoethyl ether and the like are used.

  Next, the above-described printing unit 3 will be described in more detail.

  As shown in FIG. 1, the printing unit 3 receives a supply unit 11 that supplies a printing paste P, a gravure roll 12 that receives the supply of the printing paste P from the supply unit 11, and a printing paste P that is received from the gravure roll 12. A blanket roll 13 that is transferred to the printing material K and a cleaning roll 14 that cleans the surface of the blanket roll 13 are provided.

  The supply part 11 has a storage part for the printing paste P formed by, for example, a foam material having a predetermined shape and a part of the surface 12 a of the gravure roll 12. By the rotation of the gravure roll 12, the printing paste P is supplied from the supply unit 11 to the surface 12 a of the gravure roll 12.

  The gravure roll 12 is constituted by, for example, a smooth roll (smooth plate) in which no recess is formed, and is rotatable in a predetermined direction (clockwise in FIG. 1). The surface 12a of the gravure roll 12 is not particularly limited, but is a mirror surface made of a metal such as a steel material subjected to hard chrome plating, stainless steel, anodized aluminum, or the like. Here, the mirror surface is, for example, a surface having a surface roughness Ra of 10 μm or less, preferably 1 μm or less. The printing paste P supplied to the gravure roll 12 is delivered to the blanket roll 13 at a position exceeding a half circumference from the supply position by the supply unit 11.

  With respect to the gravure roll 12, an upper doctor blade 15 and a lower doctor blade 16 are disposed so as to sandwich the supply position by the supply unit 11 up and down. The upper doctor blade 15 is a part that functions as a gap forming part 17 that forms a gap G with the surface 12 a of the gravure roll 12. For example, tape members (not shown) made of, for example, aluminum are provided at both ends of the upper doctor blade 15 in the width direction (the axial direction of the gravure roll 12), and the upper doctor blade 15 has a tape member on the surface of the gravure roll 12. It arrange | positions with respect to the gravure roll 12 so that 12a may be contact | connected. Thereby, a gap G based on the thickness of the tape member is formed between the tip of the upper doctor blade 15 and the surface 12a of the gravure roll 12. The size of the gap G can be adjusted by changing the thickness and number of tape members.

  On the other hand, the lower doctor blade 16 is a portion that removes the printing paste P remaining on the gravure roll 12 without being transferred to the blanket roll 13 from the surface 12a. The tip of the lower doctor blade 16 is disposed so as to contact the surface of the gravure roll 12. Below the lower doctor blade 16, a tray 18 for receiving the printing paste P scraped off from the surface 12a of the gravure roll 12 by the lower doctor blade 16 is disposed.

  For example, at least the surface 13a of the blanket roll 13 is made of an elastic body such as rubber. The blanket roll 13 is, for example, arranged downstream of the gravure roll 12 in the conveyance direction of the printing material K, and is rotatable in the opposite direction to the gravure roll 12 (counterclockwise in FIG. 1). Examples of the rubber constituting the blanket roll 13 include silicone rubber, butyl rubber, urethane rubber, ethylene propylene rubber, and nitrile rubber. The hardness of the rubber is preferably 80 or less, and more preferably 30 or less.

The blanket roll 13 is driven between a contact position rotating in contact with the gravure roll 12 and a non-contact position spaced apart from the gravure roll 12. At the contact position, at least a part of the printing paste P is transferred from the gravure roll 12 to the blanket roll 13. In this contact position, it is preferable that the pressure (indentation pressure) of the contact portion between the blanket roll 13 and the gravure roll 12 is 0.5 N / cm ² or more. The indentation pressure is more preferably 1.0 N / cm ² or more, and further preferably 2.0 N / cm ² or more.

Further, the position directly below the blanket roll 13 at the contacted position is a transfer position at which the printing paste P is transferred to the printed material K. Even at this transfer position, it is preferable that the blanket roll 13 is pressed into the printing material K with a pressing pressure of a contact pressure (printing pressure) of 0.5 N / cm ² or more. The indentation pressure is more preferably 1.0 N / cm ² or more, and further preferably 2.0 N / cm ² or more. This indentation pressure can be adjusted by raising and lowering the printing unit 3 in a direction crossing the driving direction of the slide table 2.

  Moreover, in the contact position of the blanket roll 13 and the gravure roll 12, it is preferable that the blanket roll 13 is pushed into the gravure roll 12 with a pushing amount of 1.0 mm or more. That is, if the radius before pressing the gravure roll 12 is R1, the radius before pressing the blanket roll 13 is R2, and the distance between the central axis G1 of the gravure roll 12 and the central axis G2 of the blanket roll 13 after pressing is R3, The pushing amount N1 represented by (R1 + R2) −R3 is 1.0 mm or more (see FIG. 3).

  Also, at the transfer position where the printing paste P is transferred to the printing material K, it is preferable that the blanket roll 13 is pushed into the printing material K with a pushing amount of 1.0 mm or more. That is, assuming that the radius before pressing the blanket roll 13 is R2, and the distance from the central axis G2 of the blanket roll 13 after pressing to the surface of the substrate K is R4, the pressing amount N2 represented by R2-R4 is 1. It is 0 mm or more. (See FIG. 4). This pushing amount N2 can be adjusted by raising and lowering the printing unit 3 in a direction crossing the driving direction of the slide table 2.

  For example, the cleaning roll 14 is disposed downstream of the blanket roll 13 in the conveyance direction of the printing material K, and is rotatable in the opposite direction to the blanket roll 13 (clockwise in FIG. 1). The cleaning roll 14 is driven between a cleaning position rotating in contact with the blanket roll 13 positioned at the non-contact position and a non-cleaning position spaced apart from the blanket roll 13 positioned at the non-contact position. Yes. At the cleaning position, the printing paste P that is not transferred to the printing material K and remains on the surface 13a of the blanket roll 13 is delivered to the cleaning roll 14.

A doctor blade 19 is disposed for the cleaning roll 14. The tip of the doctor blade 19 is disposed so as to contact the surface of the cleaning roll 14 located at the non-cleaning position. Under the doctor blade 19, a tray 20 is disposed that receives the printing paste P scraped off from the surface of the cleaning roll 14 by the doctor blade 19.
[Printing process by gravure offset printing device]

  A printing process by the above-described gravure offset printing apparatus 1 will be described.

  At the start of printing, in the gravure offset printing apparatus 1, the blanket roll 13 is positioned at the non-contact position and the cleaning roll 14 is positioned at the non-cleaning position. In this state, first, as shown in FIG. 2, the rotation of the gravure roll 12 is started and the supply of the printing paste P by the supply unit 11 is started.

  The printing paste P supplied from the supply unit 11 to the surface 12a of the gravure roll 12 passes through a gap G formed between the upper doctor blade 15 and the surface 12a, and the gravure roll 12 has a thickness based on the gap G. A film is formed on the surface 12a. At this time, since the surface 12a of the gravure roll 12 is a metal mirror surface, the printing paste P formed on the surface 12a of the gravure roll 12 becomes a smooth film without a printing pattern. In the idling state (before contact with the blanket roll 13), the printing paste P formed on the surface 12 a of the gravure roll 12 is written down by the lower doctor blade 16 and collected by the tray 18.

  Next, as shown in FIG. 3, the blanket roll 13 is rotated and positioned at the contact position, and the blanket roll 13 is brought into contact with the gravure roll 12 with a predetermined pushing amount. Thereby, a part of the printing paste P formed on the surface 12 a of the gravure roll 12 is delivered to the surface 13 a of the blanket roll 13. The remaining printing paste P that has not been transferred to the surface of the blanket roll 13 is written off by the lower doctor blade 16 and collected by the tray 18. When the printing paste P on the surface 13a of the blanket roll 13 goes around once, the blanket roll 13 is returned to the non-contact position.

  After the printing paste P is delivered to the blanket roll 13, for example, the substrate K is placed so that the point where the blanket roll 13 and the gravure roll 12 first contact each other coincides with the printing start position. The slide table 2 is conveyed toward the printing unit 3 side. Then, as shown in FIG. 4, the printing material K is conveyed to the transfer position, and the printing paste P on the surface of the blanket roll 13 is transferred to the printing material K.

After the transfer of the printing paste P, as shown in FIG. 5, the cleaning roll 14 is positioned at the cleaning position, and the cleaning roll 14 is brought into contact with the surface 13a of the blanket roll 13 on which the transfer of the printing paste P has been completed. Thereby, the remaining printing paste P that has not been transferred to the surface of the printing material K is removed from the blanket roll 13 and collected in the tray 20. Thereafter, the pedestal 5 and the printed material K are picked up from the slide table 2 by the pedestal receiving unit 6, and the printing paste P transferred to the printed material K in a separate process is dried with hot air, thereby printing on the printed material K. Is completed.
[Function and effect]

  As described above, in the gravure offset printing apparatus 1, the printing paste P can be supplied to the surface 12 a of the gravure roll 12 with an arbitrary thickness by the gap forming unit 17 configured by the upper doctor blade 15. Moreover, while the gravure roll 12 is comprised by the smooth roll without a recessed part, the surface 12a of the gravure roll 12 is a metal mirror surface. Therefore, even when the printing paste P on the surface 12a of the gravure roll 12 formed by the gap forming portion 17 is a thick film, smoothness can be ensured satisfactorily, and a thick film with good smoothness can be obtained by one printing. K can be printed.

In the gravure offset printing apparatus 1, at least the surface 13a of the blanket roll 13 is formed of rubber having a hardness of 80 or less. Thereby, the smoothness of the thick film printed on the to-be-printed material K can fully be improved by giving sufficient elasticity to at least the surface 13a of the blanket roll 13. FIG. In this way, the blanket roll 13 is pushed from the gravure roll 12 to the blanket roll 13 by pressing the blanket roll 13 with a pressing amount of 10 mm or less with respect to the gravure roll 12 at the time of printing with the surface 13a of the blanket roll 13 having elasticity. The smoothness of the transferred printing paste P can be secured well. Further, in the gravure offset printing apparatus, the blanket roll 13 is pushed into the printing material K with a pushing amount of 10 mm or less during printing. Thereby, the smoothness of the printing paste P transferred to the substrate K can be ensured satisfactorily.
[Modification]

The present invention is not limited to the above embodiment. For example, in the above embodiment, in the gap forming portion 17, the gap G is formed by the tape members provided at both ends in the width direction of the upper doctor blade 15, but the position of the tip of the upper doctor blade 15 is the position of the gravure roll 12. A driving means for driving the surface 12a may be provided so that the size of the gap G is adjustable. Moreover, in the said embodiment, although the gravure roll 12 was illustrated as a gravure plate, you may use a flat gravure plate.
[Effectiveness confirmation test]

  Then, the effect confirmation test of this invention is demonstrated. In this test, a smooth plate having a metal mirror surface is used as a gravure plate (Example), and a plurality of types of plates having different plate depths and numbers of lines (Comparative Example) are used. Each of the formed printed films is evaluated.

The composition of the printing paste used for the evaluation was an acrylic polyol resin (molecular weight 50000, glass transition temperature 80 ° C.) 33.3% by mass, a polyisocyanate resin (monomer: hexamethylene diisocyanate) 10.0% by mass, and butyl acetate. 33.3 mass% and cyclohexanone were 23.4 mass%. The printed material was a flat molded product made of ABS (acrylonitrile butadiene styrene) resin.
(Example)

In this example, after preparing a printing paste, the surface of the surface was polished with a P200 polishing material, and the surface was polished with a hard chrome plating. Then, the printing paste was 75 μm thick using an applicator. A film was formed. Next, the printing paste on the smooth plate was transferred to a blanket roll made of silicone rubber (rubber hardness 10), and the printing paste was transferred from the blanket roll to the substrate. The blanket roll indentation pressure to the smooth plate during delivery of the printing paste from the smooth plate to the blanket roll and the blanket roll indentation pressure to the substrate during transfer of the printing paste to the substrate are both 1.0 N / It was cm ^2. Thereafter, the substrate to which the printing paste was transferred was dried with hot air at 80 ° C. for 10 minutes.
(Comparative example)

In the comparative example, instead of a smooth plate, a dot plate having a plate depth of 45 μm and # 150 lines (Comparative Example 1), a plate plate having a plate depth of 45 μm and # 100 lines (Comparative Example 2), and a plate depth of 80 μm and # 75 lines A lattice plate (Comparative Example 3) and a lattice plate (Comparative Example 4) having a plate depth of 80 μm and # 50 lines were prepared. Next, after applying the printing paste to each plate, the printing paste on the surface was removed with a doctor blade, and the printing paste was filled only in the recesses. Thereafter, the printing paste was transferred to the blanket roll, transferred to the printed material, and dried with hot air under the same conditions as in the example.
(Evaluation)

  About the Example and Comparative Examples 1-4, the film thickness of the printing film after drying formed in the to-be-printed material, the gloss value, and the external appearance (smoothness, plate | grain) were evaluated. About glossiness, the specular reflectance of 60 degrees-60 degrees was measured using the micro trigloss (made by Big Chemie Japan Co., Ltd.). In addition, the smoothness and the printing pattern were evaluated by visually confirming the reflection of the background (fluorescent lamp, etc.) in the printed film. The degree of smoothness is A (good: smoothness such that the image of the fluorescent lamp is slightly distorted when the fluorescent lamp is reflected on the substrate), B (possible: fluorescent when the fluorescent lamp is reflected on the substrate) The image of the lamp looks distorted, but it is smooth enough to be recognized as a fluorescent lamp, and C (defect: the surface is so rough that it cannot be recognized as a fluorescent lamp when the fluorescent lamp is reflected on the printed material). The grade is graded, and the degree of the plate is visually determined by Lv. 0 (no plate) to Lv. The evaluation was carried out as a 6-level evaluation of 5 (strong version).

  FIG. 6 shows the evaluation results. As shown in the figure, in the example, a thick film having a thickness of about 10 μm can be formed on the substrate by one printing, the gloss value is 90, the smoothness is A, and the plate is Lv. The result was 0. On the other hand, in Comparative Example 1, the degree of the plate is Lv. Although it was good at 0, the film thickness that could be formed by one printing was about 4 μm, the gloss value was 41 to 45, and the degree of smoothness was C.

  In Comparative Example 2, the film thickness that can be formed by one printing is about 4 μm, the gloss value is 13 to 15, the degree of smoothness is C, and the degree of plate is Lv. The result was 4. In Comparative Example 3, the film thickness that can be formed by one printing is about 6 μm, the gloss value is 31 to 35, the degree of smoothness is C, and the degree of plate is Lv. The result was 4. In Comparative Example 4, the film thickness that can be formed by one printing is about 6 μm, the gloss value is 30 to 37, the degree of smoothness is C, and the degree of plate is Lv. The result was 5.

  From the above results, it is possible to form a smooth thick film on a printing material by one printing by supplying a printing paste to a smooth plate having a metal mirror surface as a surface and transferring it to the printing material through a blanket cylinder. confirmed.

  DESCRIPTION OF SYMBOLS 1 ... Gravure offset printing apparatus, 11 ... Supply part, 12 ... Gravure roll (gravure plate), 12a ... Surface, 13 ... Blanket roll (blanket cylinder), 13a ... Surface, 17 ... Gap formation part, G ... Gap, K ... Substrate, P ... printing paste.

Claims (12)

A supply unit for supplying printing paste;
It is composed of a smooth plate having a metal mirror surface as a surface, and a gravure plate that receives supply of the printing paste from the supply unit;
A blanket cylinder for receiving the printing paste from the gravure plate and transferring it to a substrate;
A gravure offset printing apparatus comprising: a gap forming portion that forms a gap with the surface of the gravure plate and adjusts a thickness of the printing paste on the surface passing through the gap.   The gravure offset printing apparatus according to claim 1, wherein at least a surface of the blanket cylinder is formed of rubber.   The gravure offset printing apparatus according to claim 2, wherein the rubber has a hardness of 80 or less. The gravure offset printing apparatus according to any one of claims 1 to 3, wherein the blanket cylinder is pressed into the gravure plate with a pressing pressure at a contact pressure of 0.5 N / cm ² or more during printing. The gravure offset printing apparatus according to any one of claims 1 to 4, wherein the printing object is pushed into the blanket cylinder with a pushing pressure at a contact pressure of 0.5 N / cm ² or more during printing.   The gravure offset printing apparatus according to claim 1, wherein the printing object is a three-dimensional object having a three-dimensional shape. As a gravure plate that receives the supply of printing paste from the supply unit, using a smooth plate with a metal mirror surface as the surface,
Between the surface of the gravure plate, forming a gap by a gap forming portion,
A gravure offset printing method for adjusting the thickness of the printing paste supplied from the supply unit onto the surface of the gravure plate by passing the gap, and then transferring the printing paste to a blanket cylinder and transferring it to a printing material .   The gravure offset printing method according to claim 7, wherein at least a surface of the blanket cylinder is formed of rubber.   The gravure offset printing method according to claim 8, wherein a rubber having a hardness of 80 or less is used as the rubber. The gravure offset printing method according to any one of claims 7 to 9, wherein, during printing, the blanket cylinder is pushed into the gravure plate with an indentation pressure at a contact pressure of 0.5 N / cm ² or more. The gravure offset printing method according to any one of claims 7 to 10, wherein, during printing, the substrate is pushed into the blanket cylinder with an indentation pressure that provides a contact pressure of 0.5 N / cm ² or more.   The gravure offset printing method according to any one of claims 7 to 11, wherein the substrate is a three-dimensional object having a three-dimensional shape.

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