WO2019230473A1

WO2019230473A1 - Printing device

Info

Publication number: WO2019230473A1
Application number: PCT/JP2019/019869
Authority: WO
Inventors: 宏紀尾関; 幸司山田; 裕次岩切; 亨下村
Original assignee: 東洋製罐株式会社
Priority date: 2018-05-30
Filing date: 2019-05-20
Publication date: 2019-12-05

Abstract

Provided is a printing device that, without the need for advanced control, prevents incomplete printing by preventing ink that has been transferred onto target objects from coming back into contact with a transfer member, maintains printing quality even when processing is accelerated, and makes it possible to achieve high production efficiency. The present invention comprises: a transfer member (150) that has on the surface thereof an image region (151) at which an image is formed; a plurality of mandrels (120) that carry cylindrical target objects and are capable of turning; and a transport unit (130) that moves the mandrels (120) along a transport route. The transfer member (150) has a re-adhesion prevention region (152) that suppresses adhesion of an image that been transferred onto an outer circumferential surface of a body part of the target objects.

Description

Printing device

The present invention comprises a transfer member having an image area on which an ink image is formed on the surface, and a transport unit that moves a plurality of self-rotating mandrels carrying a cylindrical object to be processed along the transport path. The present invention relates to a printing apparatus having a transfer station that transfers an ink image formed in the image area to an outer peripheral surface of a body portion of a workpiece.

Conventionally, in curved surface printing on the body of cylindrical objects such as seamless cans made of metal such as aluminum and steel, plate-type printing using a printing plate and inkjet printing or electrophotographic printing without using a plate A method of using is known.
For plate printing, for example, each color inker plate cylinder is equipped with a resin relief plate, each color ink from the resin relief plate is transferred to a blanket, and then transferred to a mandrel processed object that can be rotated from the blanket to form an image. For example, printing.

Special table 2016-511175 gazette

For example, in a printing apparatus known in Patent Document 1, a blanket wheel or a blanket belt, which is a transfer member having an image area on the surface of which is formed, a mandrel capable of rotating, which carries a cylindrical workpiece, The mandrel wheel is a transport unit that moves the mandrel along the transport path.
In these known offset printing, the mandrel itself has no drive mechanism, and is configured such that the cylindrical object to be processed and the transfer member are brought into contact with each other with a predetermined pressing force and driven by frictional force to rotate the mandrel. The object to be processed rotates about once while passing through the transfer station, and is set so that the cylindrical object to be processed and the transfer member are pressure-bonded before and after the image area.

At this time, when printing is performed on the entire circumference of the cylindrical object to be processed, the ink transferred to the object to be processed is again pressure-bonded to the transfer member, which causes a problem that the quality of printing is deteriorated.
Also, when the transfer member is a transfer belt and does not use a convex blanket, and the image area is formed directly on the surface of the transfer belt, the transfer belt and the object to be processed are separated at the same time as the transfer is completed in order to avoid re-compression. There is a risk that the mechanism becomes complicated or difficult to control, the adjustment is out of alignment, re-bonding occurs when the mechanism is separated late, and printing is incomplete when the component is separated early.

The present invention solves these problems, and does not require a complicated mechanism or advanced control, and the ink transferred to the object to be processed is again pressure-bonded to the transfer member, resulting in incomplete printing. It is an object of the present invention to provide a printing apparatus capable of preventing printing, maintaining printing quality even when the processing speed is increased, and obtaining high production efficiency.

The printing apparatus according to the present invention includes a transfer member having an image area on which an ink image is formed, a rotatable mandrel carrying a cylindrical object to be processed, and a plurality of the mandrels moving along a conveyance path. And a transfer unit that transfers an ink image formed in the image area of the transfer member to the outer peripheral surface of the body of the object to be processed, the transfer member including the object to be processed This problem is solved by having a re-adhesion prevention region that suppresses the adhesion of the image transferred to the outer peripheral surface of the body portion.

According to the printing apparatus of the present invention, the transfer member has the re-adhesion prevention region that suppresses the adhesion of the image, so that the ink transferred to the object to be processed in the transfer station is again pressed against the transfer member. However, by providing a re-adhesion prevention area, the ink transferred to the object to be processed is prevented from adhering to the transfer member, and the processing speed can be increased without providing a complicated mechanism or performing advanced control. However, it is possible to maintain the printing quality and obtain high production efficiency.

According to the constructions of claims 2 to 5, re-adhesion prevention comprising an image area having a high ink holding ability and an ink repellent area having a low ink holding ability can be easily achieved simply by forming a film on the surface of a conventional transfer member. Regions can be arranged.
According to the configuration of the sixth aspect, the ink image forming unit is provided on the upstream side of the transfer station, and the film application surface is provided on the upstream side of the ink image forming unit, so that the transfer member is subjected to coating or surface treatment in advance. There is no need, and it becomes possible to easily provide a re-adhesion prevention region comprising an ink repellent region at an arbitrary position of the transfer member.

According to the configuration of the seventh aspect, it is possible to cancel the pressure bonding between the transfer belt as the transfer member and the object to be processed even in the transfer station only by setting the arrangement of the non-pressure bonding area as the reattachment prevention area in advance. Since the timing of the transfer is regulated, it is possible to prevent the ink transferred to the object to be pressed against the transfer member again or imperfect printing without providing a complicated mechanism or advanced control. it can.
As a result, even when the processing speed is increased, the printing quality can be maintained and high production efficiency can be obtained.
According to the configuration according to the eighth and ninth aspects, the non-pressure-bonding region that is the anti-reattachment region can be arranged with a slight addition to the conventional printing apparatus having an endless transfer belt.
According to the configuration of the tenth aspect, even when printing is performed on the entire periphery of the object to be processed, the reattachment prevention area is adjacent to the upstream side of the image area, so that the ink transferred to the object to be processed can be obtained. Adhering to the transfer member is suppressed.

1 is a schematic explanatory diagram of a printing apparatus according to a first embodiment of the present invention. FIG. 2 is a partial explanatory view of the printing apparatus according to the first embodiment of the present invention. FIG. 6 is a partial explanatory diagram of a printing apparatus according to a modification of the first embodiment of the present invention. FIG. 9 is a partial explanatory view of a printing apparatus according to a second embodiment of the present invention. FIG. 10 is a partial explanatory diagram of a printing apparatus according to a modification of the second embodiment of the present invention.

The printing apparatus 100 according to the first embodiment of the present invention is a transfer member having an image area 151 on the surface of which an ink image is formed by an ink jet unit 113 that is an ink image forming unit, as schematically shown in FIG. An inkjet unit 113 includes a transfer belt 150, a mandrel 120 capable of rotating, which carries a can C that is a cylindrical workpiece, and a mandrel wheel 130 that is a transport unit that moves a plurality of mandrels 120 along a transport path. The transfer station 101 for transferring the ink image formed in the image area 151 of the transfer belt 150 to the outer peripheral surface of the body portion of the can C is provided.
The transfer belt 150 is wound around the wheel 110 at the transfer station 101.
In the present embodiment, on the downstream side of the transfer path of the can C of the transfer station 101, a coating wheel that coats a protective agent on the printing surface transferred to the outer peripheral surface of the body of the can C against the mandrel wheel 130. 140 is disposed, and a cleaning unit 115 for removing ink remaining on the surface of the transfer belt 150 is provided on the downstream side of the path of the transfer belt 150 of the transfer station 101.

A film coating station 160 is provided on the upstream side of the ink jet unit 113.
As shown in FIG. 2, the coating application station 160 applies a coating having a lower ink holding force than the surface of the transfer belt 150 to a place other than the image area 151 of the transfer belt 150 by the application roller 161A. The ink repellent area 152 is formed.
As shown in FIG. 3, the coating application station 160 applies a coating having a higher ink holding power than the surface of the transfer belt 150 to the image area 151 of the transfer belt 150 by the application roller 161 </ b> B. The ink-repellent region 152 may be configured.

Further, both the application roller 161A and the application roller 161B may be provided, and in this case, the degree of freedom of options of the transfer belt 150 is improved because it does not depend on the ink holding force on the surface of the transfer belt 150 itself. .
Further, the coating may be formed by stamping, spraying, ink jetting, or the like without depending on the roller, or a sheet-like solid may be applied.
These coatings are removed together with the remaining ink by the cleaning unit 115.
Further, when the position of the image region 151 on the transfer belt 150 is always constant, a film that is not removed by the cleaning unit 115 may be formed, and physical, chemical, and electrical treatment (on the surface of the transfer belt 150 ( For example, plasma, corona, flame treatment, etc.) may be applied, or the surface may be formed of a plurality of different materials.

The operation of the first embodiment configured as described above will be described.
The can C is carried on the mandrel 120 at a predetermined position upstream of the transfer station 101 of the mandrel wheel 130 and is conveyed to the transfer station 101 by the rotation of the mandrel wheel 130.
When the transfer station 101 is reached, the outer peripheral surface of the body of the can C comes into contact with the transfer belt 150.
The peripheral speed of the outer peripheral surface of the transfer belt 150 wound around the wheel 110 is set to be faster than the peripheral speed of the mandrel wheel 130, and the mandrel 120 and the carried can C are 1 while passing through the transfer station 101. While rotating more than the rotation, it moves in the center direction of the mandrel wheel 130 and is given a predetermined pressing force, and the ink image formed in the image area 151 of the transfer belt 150 is transferred to the outer peripheral surface of the body portion of the can C. .
An ink-repellent region 152 is adjacent to the upstream side of the image region 151 on the surface of the transfer belt 150, so that even if the transfer of the ink image is completed before the transfer from the transfer station 101, The outer peripheral surface of the body portion comes into contact with the ink repellent area 152 having a low ink holding force, and the ink on the printing surface is prevented from adhering to the surface of the transfer belt 150 again.

In the present embodiment, since the transfer belt 150 is simple on a uniform surface, an ink image can be created at an arbitrary position by the ink jet unit 113. Therefore, the position control of the image area 151 and the ink repellent area 152 is also electrically controlled. It can be done easily.
Further, when a film having a high ink holding power is provided on the image area 151 of the transfer belt 150, the ink image may be transferred to the can C together with the film.
Further, an adhesive layer may be further formed on the ink image formed on the image area 151 of the transfer belt 150. In this case, the adhesive strength between the ink image and the adhesive layer is higher than the adhesive strength between the ink image and the image area 151. Make you stronger.
The adhesive layer may be provided on the can side.
The adhesive layer may be formed by a roller, a stamp, a spray, an ink jet, or the like, as in the case of the above-mentioned film, or a sheet-like solid may be attached.

Next, a printing apparatus according to the second embodiment of the present invention will be described.
The overall configuration of the apparatus is the same as that of the first embodiment shown in FIG.
In the printing apparatus according to the second embodiment, as shown in FIG. 4, the wheel 110 is positioned between at least a cylindrical surface that abuts each of the image areas 151 of the transfer belt 150 and a plurality of image areas 151 of the transfer belt 150. And a recess 111 provided corresponding to the above.
Since the transfer belt 150 is hung in a straight line in contact with the wheel 110 only at both ends in the circumferential direction in the recess 111, a region having a smaller radius than that hung around the cylindrical surface is formed.
As a result, in a region other than the image region 151 of the transfer belt 150, a non-crimping region 152 that is a reattachment prevention region that is not crimped to the outer peripheral surface of the body portion of the can C is formed.

The operation of the second embodiment configured as described above will be described.
The can C is carried on the mandrel 120 at a predetermined position upstream of the transfer station 101 of the mandrel wheel 130 and is conveyed to the transfer station 101 by the rotation of the mandrel wheel 130.
When the transfer station 101 is reached, the outer peripheral surface of the body of the can C comes into contact with the transfer belt 150.

The peripheral speed of the outer peripheral surface of the transfer belt 150 wound around the wheel 110 is set to be faster than the peripheral speed of the mandrel wheel 130, and the mandrel 120 and the carried can C are 1 while passing through the transfer station 101. While rotating more than the rotation, it moves in the center direction of the mandrel wheel 130 and is given a predetermined pressing force, and the ink image formed in the image area 151 of the transfer belt 150 is pressure-bonded to the outer peripheral surface of the body portion of the can C. Transcribed.
The image area 151 on the surface of the transfer belt 150 is formed so that the upstream end face coincides with the downstream edge of the recess 111, and the image area 151 and the non-crimp area 152 are adjacent to each other. Even if the transfer of the ink image is completed before the ink is removed from the transfer station 101, the outer peripheral surface of the body portion of the can C faces the non-crimping region 152 of the transfer belt 150, and the pressing force to the surface is reduced. The surface does not press the surface of the transfer belt 150 again.

In the present embodiment, an ink image can be created at an arbitrary position by the inkjet unit 113 by assuming that the transfer belt 150 has a simple uniform surface, and the control of the position of the image region 151 and the recess 111 of the wheel 110 is also electrically performed. Can be done easily.
As long as the positional relationship between the image area 151 and the recess 111 of the wheel 110 is kept constant, the image area 151 may be a specific position on the transfer belt 150, and the ink image may be formed by means other than inkjet.

In the modified example of the second embodiment of the present invention, as schematically shown in FIG. 3, the transfer belt 250 is a plurality of image areas 251 and a thin non-crimp which is arranged between the image areas 251 respectively. And is hung around a cylindrical wheel 210.
The operation of this modification is the same as that of the second embodiment described above.
In this modification, the transfer belt 250 is hung around the wheel 210 at the transfer station, but it may be hung so as to slide on a non-rotating fixing member, in which case the fixing member has a constant radius of curvature. It does not have to be.
The ink image may be formed by means other than inkjet, and the transfer belt 250 may be a belt having a thickness of the non-crimping area 252 and a convex portion that forms the image area 251 may be laminated.

In the first embodiment, the second embodiment, and the modified examples of the present invention described above, the can C is configured to rotate by the

transfer belts

150 and 250. However, the surface of the can C is transferred to the transfer station. As long as it can be driven so as to have the same moving speed as the

transfer belts

150 and 250, a separate driving unit may be provided.
Further, the transport unit that transports the mandrels 120 and 220 may be configured by other means such as a conveyor instead of the

mandrel wheels

130 and 230.
In addition, as long as the positional relationship between the image area 151 and the ink repellent area 152 is kept constant, the ink image may be formed by means other than inkjet.
Further, although the endless transfer belt 150 is used as the transfer member, it may be a cylindrical transfer wheel, and may have both an ink repellent area and a non-pressure-bonded area as a reattachment prevention area.

DESCRIPTION OF SYMBOLS 100 ... Printing apparatus 101 ...

Transfer station

110, 210 ... Wheel 111 ... Concave 113 ... Inkjet part (ink image formation part)
115 ... Cleaning unit 120 ...

Mandrel

130, 230 ... Mandrel wheel (conveyance unit)
140 ...

Coating wheel

150, 250 ... Transfer belt (transfer member)
151, 251...

Image area

152, 252... Anti-reattachment area (ink repellent area, non-crimp area)
160 ・・・ Film coating station 161 ・・・ Coating roller C ・・・ Can (processed object)

Claims

A transfer member having an image area where an ink image is formed on the surface; a self-rotating mandrel supporting a cylindrical object to be processed; and a transport unit that moves the plurality of mandrels along a transport path.
A printing apparatus having a transfer station for transferring an ink image formed in an image area of the transfer member to an outer peripheral surface of a body portion of an object to be processed,
The printing apparatus according to claim 1, wherein the transfer member has a re-adhesion prevention region that suppresses adhesion of an image transferred to the outer peripheral surface of the body portion of the object to be processed.
The printing apparatus according to claim 1, wherein the reattachment prevention area is provided on an upstream side of the image area, and is configured by an ink repellent area having a lower ink holding power than the image area.
3. The printing apparatus according to claim 2, wherein the image area of the transfer member has a film having a higher ink holding power than the surface of the transfer member.
The printing apparatus according to claim 2 or 3, wherein the re-adhesion prevention region of the transfer member has a film having a lower ink retention than the surface of the transfer member.
A film is formed in the image area and the reattachment prevention area of the transfer member,
5. The printing apparatus according to claim 2, wherein the film in the reattachment prevention region has a lower ink holding force than the film in the image region.
The printing apparatus has an ink image forming unit upstream of the transfer station,
The printing apparatus according to claim 2, further comprising a film coating station on an upstream side of the ink image forming unit.
The transfer member is composed of an endless transfer belt wound around a cylindrical wheel that rotates in a range including at least the transfer station,
The reattachment prevention region of the transfer member is constituted by a non-crimping region that is not crimped to the outer peripheral surface of the body portion of the object to be processed in a portion hung around the wheel. 7. The printing apparatus according to any one of 6.
The printing apparatus according to claim 7, wherein the non-crimping region of the transfer member is configured by a recess provided on an outer periphery of the wheel.
The printing apparatus according to claim 7 or 8, wherein the non-crimping region of the transfer member is configured by portions having different thicknesses of the transfer belt.
10. The printing apparatus according to claim 1, wherein the reattachment prevention area is adjacent to an upstream side of the image area.