JP2009000941A - Roll-like printing blanket, manufacturing method of printed body, and printed body manufactured thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll-like printing blanket which can precisely print an ink pattern on an uneven surface for printing with 5 to 16 mm in elevation difference, a manufacturing method of a printed body including the surface to be printed and the ink pattern precisely printed thereon, and the printed body manufactured by the manufacturing method. <P>SOLUTION: The roll-like printing blanket 1 including a shaft 2 and an elastic body layer 4 held on the outer circumferential surface thereof is used in order to print the ink pattern on the uneven surface for printing with 5 to 16 mm in elevation difference h. The thickness of the elastic body layer 4 in a radial direction x being 3 to 6 times of the elevation difference h, and the length of the elastic body layer 4 in an axial direction y being 1.5 to 4.5 times of the length of the surface for printing in an axial direction y in its nip position, the hardness of the elastic body layer 4 is 3 to 55 durometers in Type A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a roll-shaped printing blanket, a method for producing a printed body using the roll-shaped printing blanket, and a printed body produced by the method for producing the printed body.

  In offset printing, a printing blanket is usually used as a transfer body used for transferring ink. A printing blanket is generally a sheet-like member having an elastic layer having an ink receiving surface and a base material for supporting the elastic layer, and is used by being fixed to the outer peripheral surface of the blanket cylinder. . In addition, the elastic body layer of the printing blanket is usually set to a thickness of about 0.1 to 3 mm, and has another layer such as a compressible layer between the elastic body layer and the substrate. Even so, the thickness of the entire printing blanket is set to about 1 to 5 mm. Further, the hardness of the elastic layer is usually set to 35 to 70 in terms of durometer hardness (type A). In such a printing blanket, since the elastic layer is thin and hard, the elastic layer cannot follow the surface shape of the printed body including irregularities and curved surfaces. Printing is not possible.

In Patent Document 1, as a method of accurately printing on a printed material having a curved surface, a rubber-like elastic blanket formed in the same polarity direction is used for the convex curved surface or the concave curved surface of the printed material, and printing ink is used. There is a printing method in which the copied elastic blanket is brought into contact with the curved surface of the substrate.
Patent Document 2 describes a gravure offset type process printing apparatus using a resilient silicone rubber blanket having a thickness of 10 mm or more, which is integrally formed with a seamless outer periphery as a transfer blanket.
JP 2006-69175 A JP 2004-188918 A

However, the printing method described in Patent Document 1 is a so-called pad printing method in which an elastic blanket is used as a transfer pad. For this reason, the printing speed is slow and the area printed by one printing process is limited.
Further, Patent Document 2 describes that by using the above-mentioned silicon rubber blanket as a transfer blanket, it can be brought into close contact with an object to be printed on an uneven surface and accurate printing can be performed. However, in the gravure offset type process printing apparatus described in Patent Document 2, it is not possible to perform precise printing on a surface to be printed having unevenness with a height difference of 5 to 16 mm.

  The object of the present invention is to provide a printing blanket capable of precisely printing an ink pattern on a printing surface having unevenness with a height difference of 5 to 16 mm, and unevenness with a height difference of 5 to 16 mm. An object of the present invention is to provide a method for producing a printed body comprising a surface to be printed and an ink pattern precisely printed on the surface to be printed, and a printed body produced by the method for producing the printed body.

  In order to achieve the above object, a roll printing blanket according to the present invention includes a shaft and a cylindrical transfer member that includes an elastic layer having an ink receiving surface and is supported on the outer peripheral surface of the shaft. , For printing an ink pattern on the ink receiving surface on a printing surface having unevenness with a height difference of 5 to 16 mm, and the thickness of the elastic layer in the radial direction of the transfer body is the height 3 to 6 times the difference, and the length of the elastic layer in the axial direction of the transfer body is 1.5 to 4.5 times the length along the axial direction of the printing surface at the nip position. The hardness of the elastic layer is 3 to 55 in terms of durometer hardness (type A).

According to this roll-shaped printing blanket, even when the surface to be printed has unevenness with a height difference of 5 to 16 mm, the ink pattern is printed with high accuracy by offset printing. be able to.
In the roll printing blanket, it is preferable that the elastic layer has a thickness of 15 to 65 mm. By setting the thickness of the elastic body in the radial direction of the transfer body within the above range, the printing accuracy of the ink pattern formed on the printing surface can be further improved.

  The method for producing a printed body of the present invention comprises: transferring an ink pattern from a printing plate to the ink receiving surface of the roll printing blanket of the present invention; and rotating the roll printing blanket around the shaft as a rotation axis. However, the ink pattern is transferred to a printing surface having unevenness with a height difference of 5 to 16 mm, and a printed body including the printing surface and the ink pattern printed on the printing surface is manufactured. It is characterized by doing.

  According to this method for producing a printed material, an ink pattern can be accurately printed by offset printing even when the surface to be printed has irregularities with a height difference of 5 to 16 mm. be able to. Further, since the ink pattern is transferred to the printing surface while rotating the blank printing blanket, the printing speed can be increased as compared with pad printing, and the printing productivity can be increased.

The printed body of the present invention is manufactured by the method for manufacturing a printed body of the present invention.
According to this printed body, an ink pattern with excellent printing accuracy can be obtained because the ink pattern is printed on the surface to be printed by the method for producing the printed body.

According to the roll printing blanket of the present invention, even if the printed surface of the printing object has irregularities with a height difference of 5 to 16 mm, the ink pattern is applied to the printed surface. Can be printed precisely.
Moreover, according to the manufacturing method of the printing body of this invention, the printing body of this invention provided with the to-be-printed surface which has the unevenness | corrugation with a height difference of 5-16 mm, and the ink pattern printed on this to-be-printed surface precisely. Can be manufactured efficiently.

  Moreover, according to the printing body of this invention, a printing body provided with the to-be-printed surface which has the unevenness | corrugation with a height difference of 5-16 mm, and the ink pattern excellent in the printing precision formed in the to-be-printed surface is provided. be able to.

  FIG. 1 is a perspective view showing an embodiment of a roll printing blanket according to the present invention, and FIG. 2 is a view showing a printing object and a roll printing blanket when an ink pattern is printed on a printing surface. FIG. 3 is an explanatory diagram showing a positional relationship, FIG. 3 is a schematic diagram showing a state of a roll printing blanket at the time of printing, and FIG. 4 is an explanatory diagram showing an example of a method for producing a printed body of the present invention. . Hereinafter, with reference to FIGS. 1 to 4, the roll printing blanket of the present invention, the method for producing a printed body, and the printed body produced thereby will be described in detail.

With reference to FIG. 1, a roll-shaped printing blanket 1 includes a shaft 2 and a cylindrical transfer body 3 carried on the outer peripheral surface of the shaft 2.
The shaft 2 is a shaft member for rotatably supporting the transfer body 3 with the central axis as a rotation axis. The shaft 2 may be made of metal or plastic, but is preferably made of metal from the viewpoint of accuracy and strength. The diameter of the shaft 2 and the length in the axial direction y are not particularly limited, and can be appropriately set according to the size of the roll-shaped printing blanket 1.

  The transfer body 3 is formed of an elastic body layer 4 having an ink receiving surface 5. Examples of the elastic body forming the elastic body layer 4 include various rubbers used for the surface rubber layer of the printing blanket, particularly preferably oil-resistant rubber. In addition, from the viewpoint of printing with excellent printing accuracy, it is preferable that the ink release surface on the ink receiving surface 5 of the transfer body 3 is excellent. It is particularly preferable to use

  Although silicone rubber is not limited to this, For example, it is preferable that it is liquid silicone rubber from a viewpoint of forming the elastic body layer 4 by a simple method. Further, from the viewpoint of thickness accuracy of the elastic body layer 4, it is preferably an addition type silicone rubber that does not generate gas or the like at the time of curing. Further, from the viewpoint of simplifying the curing process, heating, ultraviolet rays, electron beam It is preferable that it is a room temperature curable silicone rubber that does not require treatment such as irradiation.

The liquid silicone rubber is preferably a solvent-free type, but may contain a trace amount of volatile components. For example, it may contain various compounds for adjusting the viscosity and physical properties of the liquid silicone rubber, specifically, silicone oil, a curing agent, a curing rate adjusting agent, a content and the like.
The forming material of the elastic body layer 4 may contain other components such as a filler, an antifoaming agent, a leveling agent, and a dispersing agent together with the elastic body. Among these, examples of the filler include dry silica (Aerosil), calcium carbonate (CaCO ₃ ), hard clay, magnesium carbonate and the like. These fillers may be used alone or in combination of two or more. And blended.

As described above, the roll printing blanket 1 is a printing blanket for printing an ink pattern on the ink receiving surface 5 on a surface to be printed having unevenness with a height difference of 5 to 16 mm.
With reference to FIG. 2, the roll-shaped printing blanket 1 is suitable for printing on the printing object 6 having the above-described printing surface, and therefore the radial direction x of the transfer body 3 (elastic body layer 4). The thickness T of the elastic body layer 4 is 3 to 6 times, preferably 4 to 5 times, more preferably 4.5 to 5.0 times the height difference h of the unevenness on the printing surface. Set to If the thickness T of the elastic body layer 4 in the radial direction x is less than 3 times the height difference h, the deformation amount of the elastic body layer 4 decreases, so that it is impossible to print in a region where the height difference h of the unevenness is large. On the other hand, if the thickness T of the elastic body layer 4 in the radial direction x exceeds 6 times the height difference h, the amount of deformation of the elastic body layer 4 becomes too large. Although the ink pattern can be printed by bringing them into contact with each other, the force (printing pressure) by which the elastic layer 4 presses the surface to be printed becomes low, so that the dot pattern cannot be printed accurately.

  The absolute amount of the elastic layer 4 of the roll printing blanket 1 is not particularly limited. However, the roll printing blanket 1 is a printing blanket for printing an ink pattern on the ink receiving surface 5 on a printing surface having unevenness with a height difference of 5 to 16 mm, and elasticity in the radial direction x. Considering that the thickness T of the body layer 4 is 3 times or more (6 times or less) with respect to the height difference h of the unevenness on the printing surface, the thickness T of the elastic body layer 4 may be 15 mm or more. preferable. For example, considering that the shape of the elastic body layer 4 itself is maintained during non-printing (non-compression), the thickness T of the elastic body layer 4 is preferably 65 mm or less.

  Moreover, in order to make the roll-shaped printing blanket 1 suitable for printing on a printing object having the above-described printing surface, the elastic layer 4 in the axial direction y of the transfer body 3 (elastic body layer 4). The length L is 1.5 to 4.5 times the length along the axial direction y of the printing surface at the nip position (the width W of the printing object 6 in the axial direction y), preferably 2.5. It is set to be ˜3.5 times, more preferably 2.7 to 3.3 times. If the length L of the elastic layer 4 in the axial direction y is less than 1.5 times the width W of the print object 6, the size of the elastic layer 4 that can be deformed according to the unevenness of the printing surface is insufficient. Therefore, it becomes impossible to print in an area where the height difference h of the unevenness is large. On the other hand, when the length L of the elastic body layer 4 in the axial direction y exceeds 4.5 times the width W of the print object 6, the dimensions of the elastic body layer 4 that can be deformed in accordance with the unevenness of the printing surface are obtained. Therefore, although the ink pattern can be printed by bringing the elastic body layer 4 into contact with a region having a large uneven height difference h, the force (printing pressure) of the elastic body layer 4 pressing the printing surface is reduced. Therefore, the dot pattern cannot be printed with high accuracy.

  The hardness of the elastic layer 4 is durometer hardness (type A; JIS K 6253), which is 3 to 55, preferably 6 to 45, and more preferably 6 to 27. When the hardness of the elastic body layer 4 is below the above range, the elastic body layer 4 can sufficiently deform the region where the unevenness height difference h is large, but the elastic body layer 4 presses the printed surface. Since the force (printing pressure) is low, the dot pattern cannot be printed with high accuracy. On the other hand, if the hardness of the elastic body layer 4 exceeds the above range, the elastic body layer 4 becomes difficult to be deformed, so that printing cannot be performed in a region where the unevenness height difference h is large.

  In the above description, the transfer body 3 has been described as being formed of the elastic body layer 4 having the ink receiving surface 5, but the shape of the transfer body is not limited to this. For example, if the thickness of the elastic body layer in the radial direction of the transfer body is set within the above range, the transfer body includes a cylindrical core portion that covers the outer peripheral surface of the shaft and the outer peripheral surface of this core diagram. A laminated body including a cylindrical elastic body layer to be coated may be used.

As shown in FIG. 3, the roll printing blanket 1 can be deformed so that the elastic body layer 4 covers the surface to be printed of the printing object 6. Therefore, according to the above-described roll-shaped printing blanket 1, an ink pattern can be printed with high precision on a surface to be printed having irregularities of 5 to 16 mm as shown in FIG.
The method for producing a printed body of the present invention includes
An ink transfer process from a printing plate to a roll printing blanket for transferring an ink pattern to the ink receiving surface 5 of the roll printing blanket 1;
An ink transfer process to a printing surface, wherein the ink pattern is transferred to a printing surface having unevenness with a height difference of 5 to 16 mm while rotating the roll printing blanket 1 with the shaft 2 as a rotation axis. When,
Thus, it is possible to manufacture a printed body that includes the printed surface and an ink pattern printed on the printed surface.

The printing object 6 used in the method for producing a printed body is not particularly limited except that the printing surface has unevenness with a height difference of 5 to 16 mm. Specific examples of the printing object 6 for printing an ink pattern using the above-described roll-shaped printing blanket 1 include, for example, an electronic device exterior product.
The printing surface of the printing object 6 is arranged as shown in FIGS. 2 to 4 at the time of printing the ink pattern on the printing surface, for example. That is, the longitudinal direction of the printing object 6 is arranged along the direction z in which the roll-shaped printing blanket 1 advances while rotating during printing (see FIG. 4). Thereby, among the three printing surfaces 7, 8, 9 of the printing object 6, the printing surface (hereinafter sometimes referred to as “top surface”) 7 parallel to the bottom surface 10 of the printing object 6 is obtained. It is installed so as to be parallel to the work surface plate 11 of the printing press.

  In the method for producing a printed body, the top surface 7 and two printing surfaces (hereinafter sometimes referred to as “slopes”) 8 and 9 provided continuously on both sides of the top surface 7 in the axial direction y; Is set to 60 ° or less, preferably 30 to 45 °, and more preferably 35 to 40 °. When the complementary angle θ of the dihedral angle formed by the top surface 7 and the inclined surfaces 8 and 9 exceeds 60 °, the two inclined surfaces 8 and 8 are formed even when the roll-shaped printing blanket 1 is used for printing. 9 cannot be printed with high accuracy. Although the lower limit of the complementary angle θ is not particularly limited, for example, a print object having the complementary angle θ of less than 5 ° can be printed with high accuracy using a known printing blanket.

  The height difference h of the unevenness on the printing surface of the printing object 6 corresponds to the distance in the radial direction x between the top surface 7 side end and the bottom surface 10 side end of each of the slopes 8 and 9. . In this method for producing a printed body, the height difference h of the unevenness is set to be 5 to 16 mm. If the unevenness height difference h exceeds 16 mm, even if printing is performed using the above-described roll-shaped printing blanket 1, it becomes impossible to print on the two inclined surfaces 8 and 9 with high accuracy. The lower limit of the unevenness height difference h is not particularly limited. For example, a printing object having an unevenness height difference h of less than 5 mm can be accurately printed by a known printing blanket.

Referring to FIG. 4, the printing apparatus used in the method for producing a printed body includes a roll printing blanket 1, a carriage 12, a frame 13, a platen plate 14, an intaglio plate 15, a doctor 16, and an ink. A roller 17, a work surface plate 11, and a printing object 6 are provided.
The roll-shaped printing blanket 1 is supported by a carriage 12 so as to be rotatable by a shaft 2, and the ink receiving surface 5 of the roll-shaped printing blanket 1 is an intaglio 15 to be described later, or a printing object to be printed. It is supported so as to be separable from the surface (printed surface) of the article 6. The roll-shaped printing blanket 1 moves along the frame 13 while being supported by the carriage 12, and receives ink from the intaglio plate 15 on the platen plate 14 at the ink receiving surface 5. Further, the ink pattern further moved along the frame 13 and transferred to the ink receiving surface is transferred to the printing surface of the printing object 6 on the work surface plate 11.

  The platen plate 14 is fixed on the frame 13. An intaglio 15 as a printing plate is fixed to the platen plate 14. In addition, as a printing plate, it is not limited to the intaglio plate 15, For example, various plates, such as a flat plate, a waterless flat plate, a relief plate, are mentioned. However, the intaglio is preferably used in the present invention because it can form a highly reproducible pattern and a thick film pattern by using offset printing using a roll printing blanket.

Both the doctor 16 and the ink roller 17 are supported by the carriage 12 so that they can be separated from and in contact with the intaglio plate 15, and move along the frame 13.
In the ink transfer process to the roll printing blanket described above, first, ink is filled into the concave portion of the intaglio 15 by the doctor 16 and the ink roller 17. Next, after the roll-shaped printing blanket 1 is moved to the intaglio 15 on the plate surface plate 14, the ink receiving surface 5 of the roll-shaped printing blanket 1 is brought into contact with the surface of the intaglio 15 so that the roll-shaped printing blanket 1 is removed. Advancing in the direction indicated by arrow z while rotating. As a result, the ink pattern is transferred from the intaglio 15 to the ink receiving surface 5 of the roll-shaped printing blanket 1.

In the printing apparatus, the work surface plate 11 is fixed on the frame 13. Further, the printing object 6 is fixed to the work surface plate 11.
In the above-described ink transfer process to the printing surface, the roll-shaped printing blanket 1 having the ink pattern transferred to the ink receiving surface 5 is moved to the printing object 6 on the work surface plate 11, and then the roll-shaped printing blanket. While rotating 1, advance in the direction indicated by arrow z. As a result, the ink pattern transferred to the ink receiving surface 5 of the roll printing blanket 1 is transferred to the three printing surfaces 7, 8, 9 of the printing object 6. Thereby, a printing body provided with the printing surface and an ink pattern printed on the printing surface is manufactured.

  The printing ink used for manufacture of a printing body is not specifically limited, It can select suitably from various inks. Although not limited to this, Preferably, UV curable ink is mentioned. Examples of the UV curable ink include Toyo Ink Co., Ltd. seal and label ink, trade name "FD-S-TK" series, T & K TOKA UV ink, trade name "UV 161" series. Etc. In addition, a medium (color density adjusting agent) and a reducer (viscosity adjusting agent) are appropriately blended with these UV curable inks. The blending amount of these regulators may be appropriately set according to the color density and viscosity required for the ink, and is not particularly limited. Usually, the blending amount of the medium is UV curable ink according to the color of the ink. It is set in the range of 10 to 300 parts by weight with respect to 100 parts by weight. Moreover, the compounding quantity of a reducer is set in the range of 5-50 weight part with respect to 100 weight part of UV curable ink according to the viscosity and viscoelastic property of ink.

  According to the method for producing a printed body, the printed body of the present invention comprising a printed surface having irregularities with a height difference of 5 to 16 mm and an ink pattern precisely printed on the printed surface is efficiently obtained. Can be manufactured. Specifically, the printed object having the printing surface includes an electronic device exterior product. Therefore, the printed body manufacturing method prints a precise ink pattern on the printing surface of the printing object. This is a suitable method.

Next, although an example and a comparative example are given and the present invention is explained, the present invention is not limited by the following example.
Example 1
<Manufacture of blanket for roll printing>
As a mold for forming the elastic layer 4 (transfer body 3) of the roll-shaped printing blanket 1 shown in FIG. 1, a cylindrical body having an inner diameter of 200 mm and a height (inner method) of 195 mm, and one side of the cylindrical body The one provided with a bottom plate that closes the end portion, and a columnar portion having a diameter of 110 mm installed from the bottom plate along the central axis of the cylindrical body inside the cylindrical body was used. Liquid A and liquid B of a two-liquid mixed type RTV silicone rubber (product number “KE-1613” manufactured by Shin-Etsu Chemical Co., Ltd.) are blended at a predetermined ratio, and the total amount of liquid A and liquid B is 100. 0.5 parts by weight of RTV thinner (diluent) and 1 part by weight of a retarder are stirred and mixed with respect to parts by weight. After removing bubbles from the resulting mixture, the mixture is placed in the mold. Filled. The mixture is allowed to stand at room temperature for 24 hours and then demolded. The surface is polished so that the surface roughness is 0.05 μm in terms of the center line surface roughness Ra, and the cylindrical elastic layer 4 (transfer body) 3) was obtained. Next, a (material) iron shaft 2 having a diameter of 60 mm and a length of 280 mm was inserted into the cavity of the elastic layer 4. Thus, a roll-shaped printing blanket 1 was obtained.

About the obtained roll-shaped printing blanket 1, the thickness T in the radial direction x of the elastic body layer 4 was 45 mm, and the length L in the axial direction y was 195 mm. The elastic layer 4 had a durometer hardness (type A) of 27.
<Manufacture of printed materials>
As the printing plate used for the production of the printed material, intaglio plates corresponding to the ink patterns of cyan, magenta, yellow and black described later were used. Each of these intaglio plates used a metal plate surface on which concave portions corresponding to dot patterns formed on the printing surface were formed. The size of the recess is appropriately set according to the dot pattern to be formed. The maximum diameter of the recess is 500 μm and the minimum is 20 μm, and the depth of the recess is a maximum of 18 μm and a minimum of 9 μm.

  As the printing object 6, an ABS member was used. This printing object 6 was arranged so as to have a cross-sectional shape as shown in FIG. 2 with respect to the roll-shaped printing blanket 1 during printing. That is, the width W in the axial direction x of the roll-shaped printing blanket 1 is 65 mm, and of the three printing surfaces 7, 8, 9 of the printing object 6, the printing surface parallel to the bottom surface 10 of the printing object 6. (Top) 7 was installed so as to be parallel to the work surface plate 11 of the printing press.

  The top surface 7 and the two print surfaces (slopes) 8 and 9 provided continuously on both sides in the axial direction y of the top surface 7 are both the top surface 7 and the slopes 8 and 9. The complementary angle θ of the dihedral angle formed by is set to 40 °. The height difference h of the unevenness on the printing surface of the printing object 6 corresponds to the distance in the radial direction x between the top surface 7 side end and the bottom surface 10 side end of each inclined surface 8, 9. Thus, in this printing object 6, the height difference h of the unevenness was 10 mm.

The ink used was a total of four colors of cyan, magenta, yellow, and black of UV curable ink (Toyo Ink Co., Ltd. seal label ink, trade name “FD-S-TK” series).
Using the intaglio, the printing object 6, the ink, and the roll printing blanket 1, the four color inks were sequentially printed on the printing surface of the printing object 6. At the time of ink transfer from the intaglio to the roll printing blanket 1, the transfer speed between the intaglio and the roll printing blanket 1 is set to 150 mm / s, and the transfer speed between the roll printing blanket 1 to the printing object 6 is set to 150 mm. / S.

As a result of this printing, the dot pattern could be printed on the top surface 7 of the three printing surfaces of the print object 6 with high accuracy over the entire top surface 7. Further, on each of the slopes 8 and 9, the dot pattern can be printed with high accuracy in a region from the top surface 7 side end portion to the portion where the distance h in the radial direction x from the bottom surface 10 side end portion is 9 mm. did it.
Comparative Example 1
As the mold for forming the elastic layer 4, the same mold as that used in Example 1 was used except that the inner diameter of the cylindrical body was 150 mm. Moreover, the blanket 1 for roll printing was obtained like Example 1 except having used this metal mold | die. About the obtained roll-shaped printing blanket 1, the thickness T in the radial direction x of the elastic body layer 4 was 25 mm, and the length L in the axial direction y was 195 mm. The elastic layer 4 had a durometer hardness (type A) of 27.

The four color inks were sequentially printed on the printing surface of the printing object 6 in the same manner as in Example 1 except that the roll printing blanket 1 thus obtained was used.
As a result of this printing, the dot pattern could be printed on the top surface 7 of the three printing surfaces of the print object 6 with high accuracy over the entire top surface 7. However, on each of the slopes 8 and 9, the region where the dot pattern can be printed accurately is the region from the top surface 7 side end to the region where the distance h in the radial direction x from the bottom surface 10 side end is 4 mm. Due to the limitation, printing on each of the slopes 8 and 9 was insufficient.

Comparative Example 2
As the mold for forming the elastic body layer 4, the same mold as that used in Example 1 was used except that the inner diameter of the cylindrical body was 70 mm. Moreover, the blanket 1 for roll printing was obtained like Example 1 except having used this metal mold | die. About the obtained roll-shaped printing blanket 1, the thickness T in the radial direction x of the elastic body layer 4 was 65 mm, and the length L in the axial direction y was 195 mm. The elastic layer 4 had a durometer hardness (type A) of 27.

The four color inks were sequentially printed on the printing surface of the printing object 6 in the same manner as in Example 1 except that the roll printing blanket 1 thus obtained was used.
As a result of this printing, the dot pattern could be printed on the top surface 7 of the three printing surfaces of the print object 6 with high accuracy over the entire top surface 7. However, on each of the slopes 8 and 9, the region where the dot pattern can be printed is limited to the region from the top surface 7 side end portion to the portion where the distance h in the radial direction x from the bottom surface 10 side end portion is 6 mm. Therefore, printing on each of the slopes 8 and 9 was insufficient. Further, on each of the slopes 8 and 9, the force (printing pressure) for pressing the slopes 8 and 9 on which the elastic layer 4 is the printing surface is low, and the dot pattern cannot be printed with high accuracy.

Comparative Example 3
As the mold for forming the elastic body layer 4, the same mold as that used in Example 1 was used except that the height (inner method) of the cylindrical body was 78 mm. Moreover, the blanket 1 for roll printing was obtained like Example 1 except having used this metal mold | die. About the obtained roll-shaped printing blanket 1, the thickness T in the radial direction x of the elastic body layer 4 was 45 mm, and the length L in the axial direction y was 78 mm. The elastic layer 4 had a durometer hardness (type A) of 27.

The four color inks were sequentially printed on the printing surface of the printing object 6 in the same manner as in Example 1 except that the roll printing blanket 1 thus obtained was used.
As a result of this printing, the dot pattern could be printed on the top surface 7 of the three printing surfaces of the print object 6 with high accuracy over the entire top surface 7. However, on the slopes 8 and 9, the area where the dot pattern can be printed with high precision is limited to the area from the top 7 side end to the part where the distance h in the radial direction x from the bottom 10 side end is 2 mm. Therefore, printing on each of the slopes 8 and 9 was insufficient.

Comparative Example 4
As the mold for forming the elastic layer 4, the same mold as used in Example 1 was used except that the height (inner method) of the cylindrical body was 325 mm. Moreover, the blanket 1 for roll printing was obtained like Example 1 except having used this metal mold | die. About the obtained roll-shaped printing blanket 1, the thickness T in the radial direction x of the elastic body layer 4 was 45 mm, and the length L in the axial direction y was 325 mm. The elastic layer 4 had a durometer hardness (type A) of 27.

The four color inks were sequentially printed on the printing surface of the printing object 6 in the same manner as in Example 1 except that the roll printing blanket 1 thus obtained was used.
As a result of this printing, the dot pattern could be printed on the top surface 7 of the three printing surfaces of the print object 6 with high accuracy over the entire top surface 7. However, on each of the slopes 8 and 9, the region where the dot pattern can be printed is limited to the region from the top surface 7 side end portion to the portion where the distance h in the radial direction x from the bottom surface 10 side end portion is 4 mm. Therefore, printing on each of the slopes 8 and 9 was insufficient. Further, on each of the slopes 8 and 9, the force (printing pressure) for pressing the slopes 8 and 9 on which the elastic layer 4 is the printing surface is low, and the dot pattern cannot be printed with high accuracy.

Comparative Example 5
As a mixture containing RTV silicone rubber for forming the elastic body layer 4 of the roll-shaped printing blanket 1, the blending amount of the filler is changed, and the hardness of the elastic body layer 4 is durometer hardness (type A). Except that it adjusted so that it might become 2, it carried out similarly to Example 1, and obtained the blanket 1 for roll-shaped printing. About the obtained roll-shaped printing blanket 1, the thickness T in the radial direction x of the elastic body layer 4 was 45 mm, and the length L in the axial direction y was 195 mm. The elastic layer 4 had a durometer hardness (type A) of 2.

The four color inks were sequentially printed on the printing surface of the printing object 6 in the same manner as in Example 1 except that the roll printing blanket 1 thus obtained was used.
As a result of this printing, the dot pattern could be printed on the top surface 7 of the three printing surfaces of the print object 6 with high accuracy over the entire top surface 7. On the other hand, in each of the slopes 8 and 9, although the area where the dot pattern could be printed reached the part where the distance h in the radial direction x from the top surface 7 side end portion to the bottom surface 10 side end portion was 9 mm, On each of the slopes 8 and 9, the force (printing pressure) for pressing the slopes 8 and 9 on which the elastic layer 4 is the printing surface is low, and the dot pattern cannot be printed with high accuracy.

Comparative Example 6
As a mixture containing RTV silicone rubber for forming the elastic body layer 4 of the roll-shaped printing blanket 1, the blending amount of the filler is changed, and the hardness of the elastic body layer 4 is durometer hardness (type A). Except having adjusted so that it might become 38, it carried out similarly to Example 1, and obtained the blanket 1 for roll-shaped printing. About the obtained roll-shaped printing blanket 1, the thickness T in the radial direction x of the elastic body layer 4 was 45 mm, and the length L in the axial direction y was 195 mm. The elastic layer 4 had a durometer hardness (type A) of 2.

The four color inks were sequentially printed on the printing surface of the printing object 6 in the same manner as in Example 1 except that the roll printing blanket 1 thus obtained was used.
As a result of this printing, the dot pattern could be printed on the top surface 7 of the three printing surfaces of the print object 6 with high accuracy over the entire top surface 7. However, on each of the slopes 8 and 9, the region where the dot pattern can be printed accurately is the region from the top surface 7 side end portion to the portion where the distance h in the radial direction x from the bottom surface 10 side end portion is 3 mm. Due to the limitation, printing on each of the slopes 8 and 9 was insufficient.

  Table 1 below shows the thickness T (mm) of the elastic body layer 4 in the radial direction x and the thickness of the elastic body layer 4 with respect to the height difference h (= 10 mm) of the unevenness on the printing surface. The ratio T / h of T (mm), the length L (mm) of the elastic layer 4 in the axial direction y, and the ratio L / mm of the length L (mm) of the elastic layer 4 to the width W of the printing surface W and the durometer hardness (type A) of the elastic body layer 4 are shown. Also, in Table 1 below, it is shown how many mm the distance h in the radial direction x from the top surface 7 of the bottom surface 10 side end portion of the area where the dot pattern can be printed on each of the slopes 8 and 9 is “ It is shown as “printable height difference” (mm). This value is required to be 7 mm or more, preferably 8 mm or more, and more preferably 9 mm or more. Table 1 below shows the evaluation of the transfer state of the ink pattern on each of the slopes 8 and 9. The evaluation when the dot pattern was printed on each of the slopes 8 and 9 with high accuracy was evaluated as ◯, and the evaluation when the printing accuracy of the dot pattern was determined to be low due to low printing pressure was evaluated as x.

  As is apparent from Table 1, in Example 1, the printable height difference reached 9 mm, and the printing accuracy was excellent. In contrast, Comparative Example 1 in which the thickness of the elastic layer 4 is small, Comparative Example 3 in which the length L of the elastic layer 4 is short, and Comparative Example 6 in which the hardness of the elastic layer 4 is large can be printed. There was a problem that the height difference was short. Further, in Comparative Example 2 in which the thickness of the elastic body 4 is large, Comparative Example 4 in which the length L of the elastic body layer 4 is long, and Comparative Example 5 in which the hardness of the elastic body layer 4 is small, the slopes 8 and 9 are all. The transfer state of the ink pattern was not good.

  The present invention is not limited to the above description, and various design changes can be made within the scope of the matters described in the claims.

FIG. 1 is a perspective view showing an embodiment of the roll printing blanket of the present invention. FIG. 2 is an explanatory diagram showing a positional relationship between a printing object and a roll-shaped printing blanket when an ink pattern is printed on a printing surface. FIG. 3 is a schematic diagram showing the state of a roll-shaped printing blanket during printing. FIG. 4 is an explanatory view showing an example of a method for producing a printed body of the present invention.

Explanation of symbols

  1: Blank printing blanket, 2: Shaft, 3: Transfer body, 4: Elastic layer, 5: Ink receiving surface, 6: Print object, 7: Printed surface (top surface), 8: Printed surface (Slope), 9: Printed surface (Slope), T: Thickness of elastic body layer 4, W :, x: radial direction, y: axial direction.

Claims (4)

Including a shaft and an elastic layer having an ink receiving surface, and a cylindrical transfer member carried on the outer peripheral surface of the shaft,
For printing an ink pattern on the ink receiving surface on a surface to be printed having unevenness with a height difference of 5 to 16 mm,
The thickness of the elastic layer in the radial direction of the transfer body is 3 to 6 times the height difference,
The length of the elastic layer in the axial direction of the transfer body is 1.5 to 4.5 times the length along the axial direction of the printing surface at the nip position,
A roll-like printing blanket, wherein the elastic layer has a durometer hardness (type A) of 3 to 55.   The roll-shaped printing blanket according to claim 1, wherein the elastic layer has a thickness of 15 to 65 mm.   The ink pattern is transferred from the printing plate to the ink receiving surface of the blank printing blanket according to claim 1 or 2 while rotating the roll printing blanket about the shaft as a rotation axis. Is transferred to a printing surface having unevenness with a height difference of 5 to 16 mm, and a printed body comprising the printing surface and an ink pattern printed on the printing surface is manufactured. A method for producing a printed body.   A printed body produced by the method for producing a printed body according to claim 3.

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