JP3454508B2 - Resin sheet printing method and resin sheet printing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for printing a resin sheet used for a food packaging material and a printing machine according to the method.

[0002]

2. Description of the Related Art Conventionally, a gravure printing method has been adopted as a method for printing a design, a product name, etc. on a resin sheet used as a container for food or the like. A printing machine according to a gravure printing method (hereinafter, referred to as a gravure printing machine) has a cylindrical plate cylinder provided with an intaglio serving as a printing mold on an outer peripheral surface,
A cylinder-shaped impression cylinder having an outer peripheral surface formed of rubber for generating a printing pressure on a resin sheet as an object to be printed, an ink pan for collecting ink, and the ink stored in the ink pan is contacted with the intaglio plate of the plate cylinder. It is provided with a cylindrical finisher roll to be applied while applying, and a scraper for removing excess ink applied to the plate cylinder by the finisher roll.

Usually, even when printing is performed on a resin sheet with one gravure printing machine having the above-mentioned structure, a thin ink film is formed on the resin sheet, resulting in a lighter color than the ink color. Therefore, when a dark color is required, it is necessary to adjust the color depth by applying the same color of ink repeatedly. In other words, the ink film is thickened to increase the color depth. To do this,
Usually, a plurality of gravure printing machines having the above-mentioned configuration in which the same color ink is put in an ink pan are arranged in series, and a resin sheet is continuously fed to the plurality of gravure printing machines, and one surface of the resin sheet is printed. ing.

When the design to be printed on the resin sheet is composed of a plurality of colors, different color inks are put in the respective ink pans of a plurality of gravure printing machines arranged in series and continuously for printing. In addition, when printed in multiple colors, a plurality of gravure printing machines for each color are arranged in series and continuously in order to perform color adjustment such as color density, and the gravure formed for each color The groups of printing machines are further arranged in series and continuously. When the resin sheet is printed by the gravure printing machine arranged in this way, the first gravure printing machine group prints so that the first ink is overlaid, and then the gravure printing machine group in the subsequent stage further separates. Printing is done continuously as if the inks were applied repeatedly. That is, the number of gravure printing presses corresponding to the number of colors is used for printing. At this time, the intaglio plate is supposed to have a part of the design corresponding to each color.

[0005]

However, the resin sheet, which is the object to be printed, is a sheet of heat-resistant polystyrene or the like produced by copolymerizing resins having different melting points, and when the resin is copolymerized, The resin does not completely dissolve in
Resin lumps (gels) may form. Due to this gel, minute convex portions are formed on the surface of the resin sheet, and a uniform surface cannot be formed.

When this resin sheet is printed by a gravure printing machine, since the intaglio plate of the gravure printing machine is formed by a plurality of minute concave portions, a plurality of minute convex portions forming the plurality of minute concave portions are formed by gel. The ink filled in the concave portion of the intaglio plate does not transfer to the resin sheet between the flat surface and the convex portion of the resin sheet by contact with the convex portion of the resin sheet formed by There was a case. The so-called fisheye phenomenon occurs.

The resin sheet to be printed is a strip having a length of several thousand meters, and the strip is wound around a core tube to form a roll set on a printing machine. To be done. Therefore, it has been difficult to put ink on the non-coated portion (the portion where the fisheye phenomenon has occurred) to repair it after all the resin sheets having a length of several thousand meters have been printed. Further, when the resin sheet is printed again for repairing the fisheye phenomenon after all the rolls of the resin sheet have been printed, the color density of the printing of the resin sheet changes. That is, the color printed on the resin sheet may be different from the expected color of the final product, and the printed resin sheet may be a defective product.

Therefore, according to the present invention, it is possible to perform printing while repairing the fisheye phenomenon that occurs when printing a resin sheet, and a method for printing a resin sheet that does not require color adjustment accompanying the repair, and the printing method. It is an object to provide a resin sheet printing machine according to the method.

[0009]

[Means for Solving the Problems] In order to solve the above problems,
The method for printing a resin sheet according to claim 1, wherein a first printing device 2 for transferring the first ink A applied to the first intaglio plate 1 to a resin sheet S, and a resin printed by the first printing device 2. On the first ink A of the sheet S, the second intaglio 3
A printing method for a resin sheet printing machine, comprising a second printing device 4 for indirectly transferring the second ink B applied to the first printing plate, which is a cylindrical first printing plate having an outer peripheral surface provided with a first intaglio plate 1. The first plate cylinder 5 is rotated to apply the first ink A to the first intaglio plate 1, and the long resin sheet S is continuously fed onto the first plate cylinder 5 coated with the first ink A. Along with the rotation of the first plate cylinder 5 through the resin sheet S, the resin sheet S is rotated by the cylindrical first impression cylinder 6 so as to generate a printing pressure on the fed resin sheet S. Press to press the first plate cylinder 5
Of the first ink A is transferred onto the resin sheet S, while the second cylinder 7 having a cylindrical shape with the second intaglio 3 provided on the outer peripheral surface is rotated to apply the second ink B to the second intaglio 3. Then, the second ink B is transferred onto the outer peripheral surface of a cylindrical transfer roll 8 that rotates in synchronization with the rotation of the second plate cylinder 7, and the first ink is transferred onto the transfer roll 8 onto which the second ink B has transferred. The resin sheet S to which the ink A has been transferred is continuously fed, and in synchronization with the rotation of the transfer roll 8 via the resin sheet S so that a printing pressure is generated on the fed resin sheet S. The rotating cylinder-shaped second impression cylinder 9 presses the resin sheet S to transfer the second ink B of the transfer roll 8 onto the first ink A of the resin sheet S.

When the resin sheet S is printed by the above-described method, the first ink A of the first intaglio 1 cannot be completely transferred to the resin sheet S, and even if a fisheye phenomenon occurs, the outer circumference of the transfer roll 8 is increased. The second ink B is transferred to the portion where the surface is transferred and the second ink B causes the fish eye phenomenon, and the fish eye phenomenon can be eliminated.

More specifically, the first intaglio plate 1 for transferring the ink directly to the resin sheet S has a plurality of minute convex portions forming a plurality of minute concave portions. Therefore, as before,
Fisheye phenomenon occurs. On the other hand, the transfer roll 8 is
The second ink B of the second intaglio plate 3 has an outer peripheral surface without unevenness and is transferred to the outer peripheral surface of the transfer roll 8. Therefore, only the liquid second ink B rises and adheres to the outer peripheral surface of the transfer roll 8. When the resin sheet S having the fisheye phenomenon is fed onto the transfer roll 8 in such a state and the resin sheet S is printed by the second impression cylinder 9, the resin sheet S rises on the outer peripheral surface of the transfer roll 8. The adhered second ink B is crushed and the ink flows into the portion where the fisheye phenomenon occurs, and the fisheye phenomenon is eliminated.

Further, since the fisheye phenomenon is eliminated in the above process, color adjustment can be performed by printing (trial printing) only the first portion of the resin sheet S wound in a roll. That is, since the fisheye phenomenon is not repaired after all the rolls of the resin sheet S are printed, if the color density of the final product is adjusted in the above process,
There is no need for color adjustment after that. Then, when a dark color cannot be produced by only one step of the above steps (first printing apparatus 2 and second printing apparatus 4), the same steps as the above steps are continuously repeated to continuously form the resin sheet S. By printing, the resin sheet S can be given a darker color. Further, when printing a design composed of a plurality of colors, the same process as the above process in which inks of different colors are provided may be performed corresponding to the number of colors.

A method of printing a resin sheet is described in claim 2.
As described above, the first printing device 2 for transferring the ink of the first ink A applied to the first intaglio plate 1 to the resin sheet S, and the first ink A of the resin sheet S printed by the first printing device 2 The second ink B applied to the second intaglio 3 is indirectly transferred onto the first drying device 10 for forced drying and the first ink A of the resin sheet S dried by the first drying device 10. A printing method for a resin sheet printing machine, comprising: a second printing device 4; and a second drying device 11 for forcibly drying the second ink B of the resin sheet S printed by the second printing device 4. The cylindrical first plate cylinder 5 having the first intaglio 1 provided on its surface is rotated to apply the first ink A to the first intaglio 1, and the first ink cylinder 5 is coated with the first ink A. To continuously feed the long resin sheet S to the The resin sheet S is pressed by the cylindrical first impression cylinder 6 that rotates in synchronization with the rotation of the first plate cylinder 5 through the resin sheet S so that a printing pressure is generated on the resin sheet S. After transferring the ink of the first ink A of the plate cylinder 5 to the resin sheet S, the first ink A is forcibly dried, while the second cylinder 7 having a columnar shape with the second intaglio plate 3 on the outer peripheral surface is formed. The second ink B is applied to the second intaglio plate 3 by rotating, and the second ink B is transferred to the outer peripheral surface of a cylindrical transfer roll 8 that rotates in synchronism with the rotation of the second plate cylinder 7. The resin sheet S on which the first ink A has been dried by forced drying is continuously fed onto the transfer roll 8 to which the second ink B has been transferred, and a printing pressure is generated on the fed resin sheet S. As described above, the transfer roller is rotated by the cylindrical second impression cylinder 9 that rotates in synchronization with the rotation of the transfer roller 8. The second ink B may be forcibly dried after pressing the resin sheet S fed above and transferring the second ink B onto the dried first ink A of the resin sheet S. .

By adopting the above method, the second ink B on the transfer roll 8 is efficiently transferred by forcibly drying the first ink A transferred to the resin sheet S. Also,
By forcibly drying the second ink B, the printing time can be shortened. Therefore, not only the fisheye phenomenon is eliminated, but also high speed printing of the resin sheet S is possible.

Further, the resin sheet printing machine according to the above method is, as described in claim 3, a first printing device 2 for transferring the ink of the first ink A applied to the first intaglio 1 to the resin sheet S, and The second printing device 4 that indirectly transfers the ink of the second ink B applied to the second intaglio 3 onto the first ink A of the resin sheet S printed by the first printing device 2.
And a first plate cylinder 5 having both ends pivotally supported and a first plate cylinder 5 detachably provided on the outer peripheral surface of the first plate cylinder 5. First intaglio 1
And a cylindrical first impression cylinder 6 whose both ends are pivotally supported so that the first ink A of the first intaglio 1 transfers ink to the resin sheet S by generating a printing pressure on the resin sheet S. The second printing device 4 has a cylindrical second plate cylinder 7 with both ends pivotally supported.
And a second intaglio plate 3 detachably provided on the outer peripheral surface of the second plate cylinder 7, and both ends thereof are pivotally supported so that the second ink B applied to the second intaglio plate 3 is transferred to the outer peripheral surface. And a cylindrical transfer roller 8 and a cylindrical second impression cylinder whose both ends are pivotally supported so that the second ink B of the transfer roller 8 transfers ink to the resin sheet S by causing a printing pressure on the resin sheet S. And 9 are provided.

When a resin sheet is printed by the resin sheet printer having the above structure, the leading end portion of the resin sheet S wound in a roll shape is pulled out, and the leading end portion of the resin sheet S has the first intaglio 1 and the first pressure plate. It is set so as to be sandwiched by the body 6. Then, the cylindrical first intaglio 1 having both ends pivotally supported is rotated. At this time, the first impression cylinder 6 has the resin sheet S
Since the printing pressure is applied to the first plate cylinder 5, the first plate cylinder 5 rotates in synchronization with the rotation of the first plate cylinder 5.

The first plate cylinder 5 is coated with the first ink A on the first intaglio plate 1 of the first plate cylinder 5 while rotating. Since the first intaglio plate 1 forms a plate with a plurality of minute recesses, the first ink A is applied so that the recesses are filled with the first ink A. Therefore, the first ink A is transferred onto one surface of the resin sheet S while the resin sheet S is being fed by the rotation of the first plate cylinder 5 and the first impression cylinder 6. The resin sheet S printed in this way is
It is fed onto the transfer roll 8.

The transfer roll 8 is rotated in synchronization with the rotation of the second plate cylinder 7. Since the second intaglio plate 3 of the second plate cylinder 7 and the outer peripheral surface of the transfer roll 8 are substantially in contact with each other, the second ink B applied to the second plate cylinder 7 is transferred to the outer peripheral surface of the transfer roll 8. It In other words, the second ink B adheres to the outer peripheral surface of the transfer roll 8 in a form corresponding to the second intaglio plate 3. At this time, the second impression cylinder 9 is in a state in which the printing pressure is applied to the resin sheet S fed onto the transfer roll 8, so that the second impression cylinder 9 rotates in synchronization with the rotation of the transfer roll 8. Since the second ink B attached to the transfer roll 8 is attached to the outer peripheral surface of the transfer roll 8 in a raised state, the resin sheet S fed while applying the printing pressure by the second impression cylinder 9. The second ink B raised on the outer peripheral surface of the transfer roll 8 is transferred to one surface of the sheet so as to be crushed. Therefore, even if the fish-eye phenomenon occurs on the resin sheet S that has been ink-transferred by the first intaglio plate 1, the second ink B flows into the fish-eye phenomenon portion and the fish-eye phenomenon is eliminated.

Further, since the fisheye phenomenon can be eliminated by the first printing device 2 and the second printing device 4, it is possible to adjust the printing color by observing the printing state of the second printing device 4. Therefore, it is not necessary to print all the resin sheets S, and it is only necessary to test-print a minimum amount of the resin sheets S to perform color matching.

Further, as described in claim 4, at least the outer peripheral surfaces of the first impression cylinder 6 and the transfer roll 8 are elastic bodies 12.
If so, the ink transfer to the resin sheet S can be efficiently performed.

Further, as described in claim 5, at least one of the first ink A transferred to the resin sheet S by the first printing device 2 and the second ink B transferred to the resin sheet S by the second printing device 4. The printing time can be shortened by further adding drying devices 10 and 11 for forcedly drying one of them. Then, if the first ink A transferred by the first printing device 2 is forcibly dried, the second ink B is printed at the time of printing by the second printing device 4 arranged in the subsequent stage of the first printing device 2.
Are easily transferred. Further, it is possible to prevent the first ink A on the resin sheet S from flowing. Further, if the second ink B is forcibly dried, the winding of the resin sheet S becomes easy. Further, even if another printing machine is arranged downstream of the second printing apparatus 4 and the resin sheet S is continuously printed, since the second ink B is dried, the ink transfer by the other printing machine does not occur. It will be good.

If the drying devices 10 and 11 are hot air drying devices as described in claim 6, the surfaces of the first ink A and the second ink B dry quickly.

Further, when the ink is a substance whose curing is accelerated by infrared rays, the drying devices 10 and 11 may be infrared drying devices. When an infrared ray drying device is adopted and the ink is irradiated with infrared rays or far infrared rays having a predetermined wavelength, the molecules in the ink vibrate and the internal temperature of the ink rises, so that the drying and curing of the ink can be accelerated.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a resin sheet printing machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a resin sheet printing machine according to this embodiment. Such a resin sheet printing machine is
A roll mounting device 14 on which a roll 13 of a resin sheet S that is a material to be printed is disposed, and a first printing device that prints the resin sheet S drawn from the roll 13 disposed on the roll mounting device 14 with the first ink A. 2 and the first printing device 2
A first drying device 10 for drying the print applied by
A second printing device 4 for further printing the printing surface dried by the first drying device 10 with the second ink B, and a second drying device 1 for drying the printing performed by the second printing device 4.
1 and a winding portion (not shown) for winding the resin sheet S (printed resin sheet) whose printing is dried by the second drying device 11 into a roll shape. Here, the roll 13 of the resin sheet S refers to a roll in which an unprinted resin sheet S is wound around the outer circumference of a paper tube (hereinafter referred to as a core) having openings at both ends. Further, the first ink A refers to the ink used in the first printing device 2, and the second ink B refers to the ink used in the second printing device 4. And
The first ink A and the second ink B are inks of the same color.

First, the roll mounting device 14 will be described. The roll mounting device 14 is attached to each of the openings of both ends of the roll 13 so that the core of the roll 13 of the resin sheet S becomes horizontal. A pair of pivotally supporting portions that rotatably and rotatably support the shaft are arranged at intervals corresponding to the length of the roll.

Next, the first printing device 2 will be described. The first printing device 2 has a printing design in which the first ink A is applied and the first ink A is transferred to the resin sheet S. A first plate cylinder 5 having the first intaglio 1 attached thereto, a finisher roll 15 for applying the first ink A onto the first intaglio 1, a first ink pan 16 for accumulating the first ink A, and a first First scraper 1 for removing excess first ink A adhering to first intaglio plate 1 of plate cylinder 5
7, a first impression cylinder 6 that applies a printing pressure to the resin sheet S when the resin sheet S is positioned on the first plate cylinder 5, and the first impression cylinder 6
So as to generate a printing pressure on the resin sheet S, the first impression cylinder 6
And a backup roll 18 for pressing.

The first plate cylinder 5 has a cylindrical shape,
At both ends of the first plate cylinder 5, an axis having the same axis as the axis of the first plate cylinder 5 is provided so as to project from both end surfaces of the first plate cylinder 5. Further, a motor (not shown) is connected to one of the shafts via a decelerator so as to rotate the first plate cylinder 5 corresponding to the feeding direction of the resin sheet S. Further, the first intaglio plate 1 is detachably attached to the entire outer peripheral surface of the first plate cylinder 5. Here, the first intaglio 1 is an intaglio in which the same shape as the design for printing on the resin sheet S by a plurality of minute recesses is provided on one surface of a foldable plate material. The first plate cylinder 5 thus configured is attached to the frame (not shown) of the first printing device 2 in a state where the shafts at both ends are pivotally supported so that the shaft center is horizontal.

The furnisher roll 15 has a cylindrical shape, and has a length substantially equal to that of the first plate cylinder 5, and a diameter smaller than that of the first plate cylinder 5. ing. Also, at both ends of the finisher roll 15,
A shaft projecting from both end surfaces of the finisher roll 15 is provided so as to be coaxial with the finisher roll 15. Further, in the finisher roll 15 having the above structure, the axis of the finisher roll 15 and the axis of the first plate cylinder 5 are parallel to each other, and the outer peripheral surface of the finisher roll 15 and the first plate It is arranged below the first plate cylinder 5 so as to come into contact with the first intaglio plate 1 of the cylinder 5, and the first ink A is appropriately adhered to the outer peripheral surface of the finisher roll 15 in the axial direction. A part of the outer peripheral surface is immersed in the first ink A of the one ink pan 16 and is attached to the frame (not shown) of the first printing device 2 with the shafts at both ends rotatably supported. .

The first ink pan 16 has a depth greater than the length of the finisher roll 15. Moreover, the outer diameter of the finisher roll 15 is accommodated, and there is a width that can receive the excess ink of the first intaglio plate 1 cut off by the first scraper 17. Then, the first ink A having a predetermined liquid amount in consideration of the depth and the width.
It has a depth that can store water.

The first scraper 17 has a substantially rectangular shape in a plan view, and in order to drop off excess ink adhering to the first intaglio plate 1, its long side is approximately equal to the length of the first plate cylinder 5. It is said that. A sharp edge is formed on one of the long sides. And the first scraper 1
7, the axis of the first plate cylinder 5 is parallel to the edge,
Further, it is fixed to the frame (not shown) of the first printing device 2 so that the edge contacts the outer peripheral surface of the first plate cylinder 5 coated with the first ink A.

The first impression cylinder 6 has a cylindrical shape,
The outer peripheral surface is formed of rubber 12, which is an elastic body. The first impression cylinder 6 has a length substantially equal to that of the first plate cylinder 5, and has a diameter smaller than that of the first plate cylinder 5.
It is made larger than the finisher roll 15. Further, shafts projecting from both end surfaces of the first impression cylinder 6 are provided at both ends of the first impression cylinder 6 so as to have the same axis center as the first impression cylinder 6. In the first impression cylinder 6, the axis of the first impression cylinder 6 and the axis of the first plate cylinder 5 are parallel to each other, and the outer peripheral surface of the first impression cylinder 6 and the first plate cylinder 5 are In a state in which the first intaglio 1 is positioned above the first plate cylinder 5 so as to be substantially in contact with the first intaglio plate 1, a shaft (not shown) of the first printing device 2 is pivoted so that the shafts at both ends can be vertically displaced. It is supported.

The backup roll 18 has a columnar shape and has a length substantially equal to that of the first plate cylinder 5, a diameter smaller than that of the first plate cylinder 5, and a first impression cylinder 6 Has been made larger than. In addition, the backup roll 18
A shaft projecting from both end faces of the backup roll 18 is provided at both ends of the backup roll 18 so as to have the same axis center as the first backup roll 18. In the backup roll 18 having the above-described configuration, the axis of the backup roll 18 and the axis of the first impression cylinder 6 are parallel to each other, and the outer peripheral surface of the backup roll 18 and the outer peripheral surface of the first impression cylinder 6 are Are arranged on the first impression cylinder 6 so that they are always in contact with each other, and shafts at both ends are pivotally supported by a frame (not shown) of the first printing device 2. Specifically, the backup roll 18 is movably attached so as to correspond to the vertical displacement of the first impression cylinder 6, and is pressed so that the first impression cylinder 6 produces a printing pressure on the resin sheet S. It is pressed by means (not shown). In other words, the pressing force generated by the pressing means is transmitted to the first impression cylinder 6 via the backup roll 18 to become the printing pressure.

Next, the first drying device 10 will be described. The first drying device 10 includes a heater 23 as a heat source and a blower 24 for blowing the air warmed by the heater 23.
And a drying chamber 25 for drying the printing of the resin sheet S with the hot air blown by the blower 24.

The heater 23 is an electrothermal heater that generates Joule heat by energizing a heating wire having a high electric resistance. A turbo fan is adopted for the blower 24, and the blower port of the blower 24 and the heater 23 are connected by piping.

The drying chamber 25 is formed of a box, and an opening is formed in each of a pair of facing surfaces of the box so that the printed resin sheet S can pass through the box. . Further, a plurality of hot air outlets 26 are provided on the surface perpendicular to the surface on which the opening is formed so that the hot air is blown from four directions on the resin sheet S passing through the box body. Each of the plurality of hot air outlets 26 is connected to a blower pipe from the heater 23.

Therefore, the first drying device 10 having the above structure
Through the heater 23, the air generated by the blower 24 is turned into hot air and discharged into the drying chamber 25.

Next, the second printing device 4 will be described.
The second printing device 4 includes a second plate cylinder 7 to which a second intaglio 3 having a printing design in which the second ink B is applied is attached.
A transfer roll 8 for transferring the second ink B applied to the second intaglio plate 3 to the resin sheet S, a second ink pan 19 for accumulating the second ink B, and an extra second ink adhering to the second intaglio plate 3. A second scraper 20 for removing ink B,
The second impression cylinder 9 applies an appropriate printing pressure to the resin sheet S when the resin sheet S is positioned on the transfer roll 8.

The second plate cylinder 7 has a cylindrical shape,
The length and outer diameter are substantially the same as those of the first plate cylinder 5.
At both ends of the second plate cylinder 7, an axis having the same axis as the axis of the second plate cylinder 7 is provided so as to project from both end surfaces of the second plate cylinder 7. In addition, a motor is provided on one of the shafts via a reduction gear so that the second plate cylinder 7 is rotated in the opposite direction to the rotation direction of the first plate cylinder 5 at substantially the same speed as the first plate cylinder 5. (Not shown) are connected. Further, the second intaglio plate 3 is detachably attached to the entire outer peripheral surface of the second plate cylinder 7. Here, the second intaglio plate 3 is an intaglio plate in which the design for printing on the resin sheet S is reversed by a plurality of minute recesses on one surface of the foldable plate material. And
The second plate cylinder 7 uses a part of the second intaglio plate 3 on the second ink B of the second ink pan 19 so that the second ink B is appropriately attached to the second intaglio plate 3 of the second plate cylinder 7 in the axial direction. In the dipped state, it is horizontally attached to a frame (not shown) of the second printing device 4 in a state where shafts at both ends are rotatably supported.

The transfer roll 8 has a cylindrical shape, and its length and outer diameter are substantially the same as those of the second plate cylinder 7 on which the second intaglio plate 3 is mounted. The outer peripheral surface of the transfer roll 8 is formed by the rubber 12 which is an elastic body.
Further, shafts projecting from both end surfaces of the transfer roll 8 are provided at both ends of the transfer roll 8 so as to be coaxial with the transfer roll 8. The transfer roll 8 has a shaft center of the second plate cylinder 7 and a shaft of the first plate cylinder 5 so that the second ink B attached to the second intaglio plate 3 is transferred to the outer peripheral surface of the transfer roll 8. The frame of the second printing device 4 (shown in the drawing) is placed in a state in which it is positioned above the second plate cylinder 7 so that the center is parallel and the outer peripheral surface of the transfer roll 8 contacts the second intaglio plate 3. The shafts at both ends are pivotally supported.

The second ink pan 19 has a depth greater than the length of the second plate cylinder 7. Further, the outer diameter of the second plate cylinder 7 is accommodated, and it has a width capable of receiving the excess second ink B of the second intaglio plate 3 cut off by the second scraper 20. The depth is such that a predetermined amount of the second ink B can be stored in consideration of the depth and width.

Like the first scraper 17, the second scraper 20 has a substantially rectangular shape in a plan view, and has a long side in order to remove excess ink adhering to the second plate cylinder 7. It is almost equal to the length of the second plate cylinder 7. A sharp edge is formed on one of the long sides. In the second scraper 20, the axis of the second plate cylinder 7 is parallel to the edge, and the second intaglio plate 3 is formed.
It is fixed to the frame (not shown) of the second printing device 4 so that the edge of the second printing device 4 contacts.

The second impression cylinder 9 has a cylindrical shape,
The length is substantially the same as the transfer roll 8 and the diameter is smaller than that of the transfer roll 8. Further, shafts projecting from both end surfaces of the second impression cylinder 9 are provided at both ends of the second impression cylinder 9 so as to have the same axis center as the second impression cylinder 9. In the second impression cylinder 9, the axis of the second impression cylinder 9 and the axis of the transfer roll 8 are parallel to each other, and the outer peripheral surface of the second impression cylinder 9 and the outer peripheral surface of the transfer roll 8 are The shafts at both ends are pivotally supported by a frame (not shown) of the second printing device 4 in a state of being positioned above the transfer roll 8 so as to be substantially in contact with each other.

The second drying device 11 is the same as the first drying device 10.

Next, the winding device pivotally supports the shafts attached to the openings at both ends of the paper tube prepared for winding the printed resin sheet S, and corresponds to the winding direction of the resin sheet S. The paper tube is then rotated.

The resin sheet S is fed between the roll mounting device 14, the first printing device 2, the first drying device 10, the second printing device 4, the second drying device 11, and the winding unit. In order to prevent troubles from occurring in each device due to feeding,
A plurality of guide rollers 21 for tensioning the resin sheet S and adjusting the feeding direction are provided. Then, between the first printing device 2 and the second printing device 4, a tensioner 22 that causes the resin sheet S to be pulled so that the printing processing capacities of the first printing device 2 and the second printing device 4 correspond to each other. Is provided. That is, the tensioner 22 allows the second ink B transferred to the transfer roll 8 of the second printing device 4 to be transferred to the location where the ink has been transferred by the first intaglio 1 of the first printing device 2 without shifting. In addition, it is provided for adjusting the feeding of the resin sheet S.

When the resin sheet S is set in the resin sheet printing apparatus having the above structure, the tip of the resin sheet S is pulled out from the roll 13 set in the roll mounting apparatus 14, and the tip of the resin sheet S is guided to the plurality of guide rollers 21. Through the first intaglio 1 and the first impression cylinder 6. Further, after the resin sheet S is inserted into the opening of the drying chamber 25, it is fed between the transfer roll 8 and the second impression cylinder 9 via the plurality of guide rollers 21 and the tensioner 22. Then, as in the case of the first drying device 10, the resin sheet S is inserted into the opening of the drying chamber 25 and wound around the paper tube set in the winding section via the guide roller 21.

When printing the resin sheet S set in this way, first, a trial printing is performed. At this time, the hue and depth of the ink transferred to the resin sheet S are adjusted. Therefore, it is confirmed at the winding end portion of the roll 13 of the resin sheet S printed by passing through the first printing device 2 and the second printing device 4.

When the color tone and density of printing are adjusted, continuous printing is performed next. When printing is started, each of the first plate cylinder 5 and the second plate cylinder 7 starts rotation by a motor via a reduction gear. Further, the winding section also rotates the paper tube to start winding.

The roll 13 set on the roll mounting device 14 is pulled out as the first plate cylinder 5 rotates, and sequentially passes over the first plate cylinder 5. At this time, the rotation of the first intaglio plate 1 copper also rotates the finisher roll 15 partly dipped in the first ink A of the first ink pan 16, and the first ink is applied to the outer peripheral surface of the finisher roll 15. A adheres. Then, the first ink A is transferred onto the first intaglio plate 1 attached to the first plate cylinder 5 in which the outer peripheral surface is brought into contact with and rotating the finisher roll 15. Then, the excess first ink A, which cannot be completely accommodated in the concave portion of the first intaglio plate 1 which is an intaglio plate, is in contact with the first intaglio plate plate 1.
Dropped by 7. That is, the concave portion of the first intaglio plate 1 is in a state in which only the necessary minimum amount of the first ink A is filled. And backup roll 1
Since 8 is pressing the first impression cylinder 6, a printing pressure is applied to the resin sheet S located on the first plate cylinder 5. The first ink A filled in the concave portion of the first intaglio plate 1 is transferred to the resin sheet S to which the printing pressure is applied. In this way, the above steps are continuously performed, and one surface of the resin sheet S is continuously printed.

Then, when the portion printed by the first printing device 2 passes through the first drying device 10, the first ink A is dried by the hot air.

The resin sheet S that has passed through the first drying device 10 is guided by the guide roller 21 and the tensioner 22.
It is fed to the second printing device 4 via. At this time, the second plate cylinder 7 immersed in the second ink B of the second ink pan 19 rotates, and the second ink B is placed on the second intaglio plate 3 of the second plate cylinder 7.
Directly adheres. Then, the second scraper 20 in contact with the second intaglio plate 3 cuts off the excess second ink B adhering to the second intaglio plate 3, and the second ink B is deposited only in the recesses of the second intaglio plate 3. Put it in a filled state. And
The second ink B filled in the concave portion of the second intaglio plate 3 is transferred to the outer peripheral surface of the transfer roll 8 in contact with the second intaglio plate 3. That is, the second ink B adheres to the outer peripheral surface of the transfer roll 8 in a raised state. Then, the second impression cylinder 9 causes printing on the resin sheet S fed onto the transfer roll 8 to transfer the second ink B attached to the outer peripheral surface of the transfer roll 8 to the resin sheet S. .

The resin sheet S thus printed is further dried by the second dryer 11 to dry the second ink B transferred to the resin sheet S, and then the guide roller 21.
The sheet is fed to the winding section via the paper, and is wound around the outer circumference of the paper tube set in the winding section to complete printing.

When the resin sheet S has a lumpy gel, in the first printing device 2, the gel G is sandwiched near the contact portion between the first plate cylinder 5 and the first impression cylinder 6 as shown in FIG. State,
The first ink A filled in the concave portion of the first intaglio plate 1 of the first plate cylinder 5 at the boundary portion between the flat portion of the resin sheet S and the gel G.
Are not in contact with each other. That is, the fish eye phenomenon occurs.

However, in the second printing device 4 arranged in the latter stage of the first printing device 2, when the portion in which the fisheye phenomenon occurs passes over the transfer roll 8, as shown in FIG.
As shown in (a), the second ink B adhered as if it were raised on the transfer roll 8 is crushed by the printing pressure by the second impression cylinder 9, and the second ink B is applied to the portion where the fisheye phenomenon occurs. The ink B flows in. Also, when the gel passes between the axial centers of the transfer roll 8 and the second impression cylinder 9, the second ink B adhered to the transfer roll 8 as if it were raised as shown in FIG. The ink is transferred to the resin sheet S so as to be crushed by the printing pressure of the impression cylinder 9.

Therefore, when the printing of all the rolls is completed, the color tone and the density of the printing of the resin sheet S are adjusted, and the fish eye phenomenon is eliminated.

As described above, since the resin sheet S is continuously printed by the first printing device 2 and the second printing device 4, it is possible to adjust the printing color by repairing the fisheye phenomenon which has been difficult until now. The color tone and color density of printing can be adjusted by performing the trial printing of the minimum necessary resin sheet S at the start of printing, which is not necessary, and the fisheye phenomenon can be eliminated. That is, high-quality printing is possible, and since repair and color adjustment associated with the fisheye phenomenon are not required, the manufacturing process can be shortened and the printing cost can be reduced.

The resin sheet printing machine according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the present embodiment, the printing process using only the first printing device 2 and the second printing device 4 has been described, but when the printing color is darkened or when printing is performed with a plurality of colors. Alternatively, a plurality of resin sheet printing machines including the first printing device 2 and the second printing device 4 may be provided in series for printing. That is, a plurality of first printing devices 2 and second printing devices 4 may be alternately arranged such that the first printing device 2 is located at the frontmost stage and the second printing device 4 is located at the last stage. Of.

Further, in the present embodiment, the resin sheet printing machine constituted by the pair of the first printing device 2 and the second printing device 4 has been described, but the pair of the first printing device 2 and the second printing device 4 is described. However, the present invention is not limited to the configuration including, for example, two or more first printing devices 2 are arranged,
One second printing device 4 may be provided in the subsequent stage. Specifically, two or more first printing devices are provided as long as the fisheye phenomenon can be repaired by the coating film of the second ink B formed by printing of one second printing device 4. Good. In addition, one first printing device 2
When the fisheye phenomenon caused by the printing of 1 cannot be repaired by the printing of one second printing device 4, two or more second printing devices 4 may be provided. That is, if the fisheye phenomenon can be repaired in one continuous process of the first printing device 2 and the second printing device 4 and the color adjustment is possible, the first printing device 2 or the second printing device 4 One of them may be one and the other may be two or more.

When ink is applied to the first intaglio plate 1 and the second intaglio plate 3, a method of directly immersing the first intaglio plate 1 and the second intaglio plate 3 in an ink pan, a finisher roll 15
Any of the methods of applying via.

The first drying device 10 and the second drying device 11 are not limited to those using the heat wire heater, but may be those using a boiler. That is, it is only necessary to generate hot air and dry the ink.

The first drying device 10 and the second drying device 11 are not limited to the hot air drying device, and may be infrared drying devices. The dryer system may be changed according to the properties of the ink used for printing.

The plurality of guide rollers 21 and tensioners 22 provided between the respective devices are made of the resin sheet S.
It may be arranged appropriately according to the feeding speed of the above.

Further, in this embodiment, the outer peripheral surfaces of the first impression cylinder 6 and the transfer roll 8 are formed of the rubber 12 which is an elastic body, but they may be formed of a soft resin. That is, the first intaglio 1 and the second intaglio 3 are the first ink A and the second ink B.
In order for the resin sheet S to be smoothly transferred, an elastic body that can be appropriately deformed without damaging the resin sheet S may be used.

In the present embodiment, the first plate cylinder 5 of the first printing device 2 and the second plate cylinder 7 of the second printing device 4 are provided with independent speed reducers and motors. The first plate cylinder 5 and the second plate cylinder 7 may be driven by one motor by providing a speed reducer having the above, or via a belt.

[0067]

As described above, as an effect of the present invention, a first printing device for directly transferring the first ink applied to the first intaglio plate to the resin sheet is provided, and subsequently applied to the second intaglio plate in the subsequent stage. A second printing device that indirectly transfers the second ink to the resin sheet via the transfer roll is provided, so even if the fisheye phenomenon occurs in the first printing device, the fisheye phenomenon is repaired in a series of printing steps. I was able to do it.

By continuously printing the resin sheet by the first printing device and the second printing device, the fisheye phenomenon is eliminated, so that even when the color adjustment of printing is performed, the minimum required resin is used. It is now possible to check by simply making a test print of the sheet (the end of winding the resin sheet). As a result, it is not necessary to perform print color matching again after printing is completed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a resin sheet printing machine according to an embodiment of the present invention.

FIG. 2 is an enlarged situation diagram when ink is transferred to a resin sheet forming a gel in the first printing device of the resin sheet printing machine according to the embodiment.

FIG. 3 is an enlarged state diagram when ink is transferred to a resin sheet that forms a gel in the second printing device of the resin sheet printing machine according to the same embodiment (a: the transfer roll and the axial center of the second impression cylinder are located between (Situation diagram in which ink was transferred to the resin sheet before the gel passed, b: Situation diagram in which ink was transferred to the resin sheet after the gel passed between the transfer roll and the axis of the second impression cylinder).

[Explanation of symbols]

1 ... 1st intaglio, 2 ... 1st printing device, 3 ... 2nd intaglio, 4 ...
2nd printing device, 5 ... 1st plate cylinder, 6 ... 1st impression cylinder, 7 ... 2nd plate cylinder, 8 ... Transfer roll, 9 ... 2nd impression cylinder 10,11 ... Drying device (10 ... 1st drying) Device, 11 ... second drying device),
12 ... Elastic body (rubber), 13 ... Roll, 14 ... Roll mounting part, 15 ... Finisher roll, 16 ... First ink pan, 17 ... First scraper, 18 ... Backup roll, 19 ... Second ink pan, 20 ... 2nd scraper, 21 ... Guide roller, 22 ... Tensioner, 23
... heater, 24 ... blower, 25 ... drying chamber, 26 ... hot air outlet

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41F 9/00-9/02 B41F 11/00 B05C 1/02 B05C 1/08

Claims (7)

(57) [Claims] 1. A first printing device (2) for transferring the first ink (A) applied to the first intaglio plate (1) to a resin sheet (S), and printing by the first printing device (2). A second printing device (4) for indirectly transferring the second ink (B) applied to the second intaglio plate (3) onto the first ink (A) of the resin sheet (S) formed. In a printing method for a resin sheet printing machine, a cylindrical first plate cylinder (5) having a first intaglio (1) on an outer peripheral surface is rotated to rotate the first ink (1) on the first intaglio (1). A) is applied, the long resin sheet (S) is continuously fed onto the first plate cylinder (5) coated with the first ink (A), and the fed resin sheet is A cylindrical first impression cylinder (which rotates in synchronization with the rotation of the first plate cylinder (5) through the resin sheet (S) so that a printing pressure is generated in (S) ( 6) the resin sheet (S) is pressed to transfer the first ink (A) of the first plate cylinder (5) onto the resin sheet (S), while the second intaglio plate (3) is formed on the outer peripheral surface. The cylindrical second plate cylinder (7) provided is rotated to apply the second ink (B) to the second intaglio plate (3), and the second ink (B) is applied to the second plate cylinder (7). Transferred onto the outer peripheral surface of a cylindrical transfer roll (8) rotating in synchronism with rotation, and transferred the first ink (A) onto the transfer roll (8) onto which the second ink (B) had transferred. The resin sheet (S) is continuously fed, and the rotation of the transfer roll (8) is synchronized with the resin sheet (S) so that a printing pressure is generated on the fed resin sheet (S). The resin sheet (S) is pressed by the cylindrical second impression cylinder (9) that rotates, and the transfer roll is transferred onto the first ink (A) of the resin sheet (S). Resin sheet printing method, characterized in that to ink transfer second ink (B) is Le (8). 2. A first printing device (2) for transferring the first ink (A) applied to the first intaglio plate (1) to a resin sheet (S), and printing by the first printing device (2). A first drying device (10) for forcibly drying the first ink (A) of the resin sheet (S) thus dried, and the first ink (A) of the resin sheet (S) dried by the first drying device (10). )
A second printing device (4) for indirectly transferring the second ink (B) applied to the second intaglio plate (3), and a resin sheet (2) printed by the second printing device (4). S)
Second drying device (1) for forcedly drying the second ink (B) of
1) A printing method of a resin sheet printing machine comprising:
The first ink (A) is applied to the first intaglio (1) by rotating a cylindrical first plate cylinder (5) provided with the first intaglio (1) on the outer peripheral surface.
And the continuous resin sheet (S) is continuously fed onto the first plate cylinder (5) coated with the first ink (A), and the fed resin sheet (S) ) Is applied to the resin sheet (S) with a cylindrical first impression cylinder (6) that rotates in synchronization with the rotation of the first plate cylinder (5) through the resin sheet (S). After pressing to transfer the first ink (A) of the first plate cylinder (5) to the resin sheet (S), the first ink (A) is forcibly dried while the second intaglio plate is formed on the outer peripheral surface. The cylindrical second plate cylinder (7) provided with (3) is rotated to apply the second ink (B) to the second intaglio plate (3), and the second ink (B) is applied to the second plate. Transfer to the outer peripheral surface of a cylindrical transfer roll (8) that rotates in synchronism with the rotation of the cylinder (7), and force dry onto the transfer roll (8) to which the second ink (B) has transferred. The resin sheet (S) in which the first ink (A) has been dried is continuously fed, and the transfer roll (8) is rotated so that a printing pressure is generated on the fed resin sheet (S). The resin sheet (S) fed onto the transfer roll (8) is pressed by the second cylindrical impression cylinder (9) which rotates in synchronization with the resin sheet (S).
2. The method for printing a resin sheet, comprising transferring the second ink (B) onto the dried first ink (A) and then forcibly drying the second ink (B). 3. A first printing device (2) for transferring the first ink (A) applied to the first intaglio plate (1) to a resin sheet (S), and printing by the first printing device (2). A second printing device (4) for indirectly transferring the second ink (B) applied to the second intaglio plate (3) onto the first ink (A) of the resin sheet (S) formed. A resin sheet printer, wherein the first printing device (2) comprises a cylindrical first plate cylinder (5) having both ends pivotally supported, and the first plate cylinder (5).
The first ink (A) of the first intaglio (1) is applied to the resin sheet (S) by applying a printing pressure to the first intaglio (1) detachably provided on the outer peripheral surface of the resin sheet and the resin sheet (S). The second printing device (4) is provided with a cylindrical second plate cylinder (both ends of which is pivotally supported so as to transfer ink). 7), a second intaglio (3) detachably provided on the outer peripheral surface of the second plate cylinder (7), and a second ink (B) applied to the second intaglio (3) on the outer peripheral surface. Cylindrical transfer roll (8) with both ends pivoted to transfer to
And a cylindrical second pressure having both ends pivotally supported so that a printing pressure is generated on the resin sheet (S) and the second ink (B) of the transfer roll (8) is transferred to the resin sheet (S). A resin sheet printing machine comprising a body (9). 4. The resin sheet printing machine according to claim 3, wherein outer peripheral surfaces of the first impression cylinder (6) and the transfer roll (8) are elastic bodies (12). 5. The first ink (A) transferred to the resin sheet (S) by the first printing device (2) or the second ink (transferred to the resin sheet (S) by the second printing device (4). The resin sheet printing machine according to claim 3 or 4, further comprising a drying device (10, 11) for forcedly drying at least one of B). 6. The resin sheet printing machine according to claim 5, wherein the drying device (10, 11) is a hot air drying device. 7. The resin sheet printing machine according to claim 5, wherein the drying device (10, 11) is an infrared drying device.