JP2012176618A - Can printing apparatus, printing method, and mandrel for holding cylindrical container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can printing apparatus, a printing method and a mandrel for holding a cylindrical container, by which printing pressure can be uniformized and by which printing quality can be improved, in printing or painting the outer circumference of a cylindrical container.SOLUTION: In the can printing apparatus which carries out printing the outer circumference of a cylindrical container 20, the can printing apparatus being equipped with a mandrel M for holding the cylindrical container 20, by making the cylindrical container 20 externally fitted to the mandrel M for holding the cylindrical container 20 contact to a blanket and rotate, the cylindrical container 20 has a barrel 23 with an opening side thick part 24 and a bottom side thin part 25, the mandrel M for holding the cylindrical container has a sleeve 1 to which the barrel 23 is externally fitted, the sleeve 1 has a small diameter part 3a formed on a base end side and a large diameter part 3b formed on a distal end side, and a boundary section between the small diameter part 3a and the large diameter part 3b is formed in a tapered diameter section 3c of which diameter expands toward the distal end side from the small diameter part 3a.

Description

  The present invention relates to a printing apparatus for a can that performs printing or coating on an outer peripheral surface of a cylindrical container to be processed into a beverage container or the like, a printing method, and a cylindrical container holding mandrel that holds the cylindrical container at the time of printing.

  As a beverage container formed from a cylindrical container having a bottomed cylindrical shape, a bottle can in which a cap is screwed to an opening end and a can in which a can lid is wound around the opening end are known. Since such a can is formed by subjecting a metal plate such as aluminum to DI (Drawing & Ironing) processing, the opening end side of the body of the can is generally thicker than the bottom side. It becomes. After this DI processing, printing is performed on the outer periphery of the cylindrical container.

  2. Description of the Related Art Conventionally, as a cylindrical container holding mandrel that holds such a cylindrical container at the time of printing, a type that includes a sleeve that is inserted inside the cylindrical container is known (see, for example, Patent Document 1). This sleeve has a straight cylindrical shape with a diameter that allows a cylindrical container to be tightly inserted and supported and can be freely inserted and removed.

A can printing apparatus 30 shown in FIG. 4 is known as a can printing apparatus provided with such a cylindrical container holding mandrel M (see Patent Document 2). The can printing apparatus 30 is a printing apparatus that performs multicolor printing on the cylindrical container 20, and includes an ink adhesion mechanism A and a can moving mechanism B. The ink adhering mechanism A contacts a plurality of inker units 31 that supply ink and the inker units 31 to copy the ink, and then contacts the cylindrical container 20 to print the ink on the outer peripheral surface of the cylindrical container 20. A blanket cylinder 32 is included.
The blanket cylinder 32 includes a blanket 35 to which ink is transferred from the plate of the plate cylinder 33 on the outer periphery thereof.

  On the other hand, the can moving mechanism B is arranged so as to be in contact with the outer periphery of the blanket cylinder 32 and has a cylindrical container having a cylindrical container holding mandrel M provided with a large number at a predetermined interval in its circumferential direction. A holding mandrel turret 34 is provided. The cylindrical container holding mandrel turret 34 is rotated (revolved) to sequentially feed the loaded cylindrical container 20 to a position in contact with the blanket cylinder 32 and discharge the printed cylindrical container 20.

  In this can printing apparatus, each inker unit 31 forms an image made of multicolor ink on the plate of the plate cylinder 33 and copies the image onto a blanket 35 on the outer periphery of the blanket cylinder 32. Then, this image is printed on the outer peripheral surface of the cylindrical container 20 by rotational contact between the blanket 35 and the cylindrical container 20 fitted on the cylindrical container holding mandrel M.

JP-A-11-227158 JP-A-9-267466

  By the way, since the outer periphery of the sleeve of the cylindrical container holding mandrel in the conventional can printing apparatus is formed in a straight shape, when the cylindrical container as described above is held, the opening end portion is made thick. Although the side is in close contact with the sleeve, the bottom side, which is thinner than the open end side, cannot be in close contact with the sleeve, resulting in a slight gap. Accordingly, when the blanket is slidably pressed against the surface of the cylindrical container in this state, there is a problem that a difference occurs in the printing pressure and the printing quality is deteriorated.

  The present invention has been made in view of such a problem, and when printing or coating is performed on the outer peripheral surface of the cylindrical container, the printing pressure can be made uniform, and the printing quality can be improved. It is an object of the present invention to provide a can printing apparatus, a printing method, and a cylindrical container holding mandrel.

In order to solve the above problems, the present invention proposes the following means.
That is, a printing apparatus for a can according to the present invention includes a rotatable blanket cylinder having a blanket to which ink is transferred on its outer periphery, and a cylindrical container holding mandrel arranged so as to be in contact with the outer periphery of the blanket cylinder. In the printing apparatus of the can which performs printing on the outer periphery of the cylindrical container by bringing the blanket into contact with the cylindrical container externally fitted to the cylindrical container holding mandrel and rotating the cylindrical container, the cylindrical container has an opening end side. The cylindrical container holding mandrel includes a sleeve that is externally fitted to the barrel portion, and the sleeve has a small diameter formed on the proximal end side. And a large-diameter portion formed on the distal end side, and a boundary between the small-diameter portion and the large-diameter portion is a tapered diameter portion that expands from the small-diameter portion toward the distal end side. Specially It is set to.

  In the printing apparatus for cans having such characteristics, the outer diameter of the sleeve follows the difference in inner diameter between the thick part and the thin part of the cylindrical container, and the outer diameter of the part corresponding to the thick part is thin. Since the outer diameter of the part corresponding to the part is set to be smaller than the outer diameter of the part corresponding to the part, the clearance disappears due to the printing pressure when the blanket is in sliding contact with the outer peripheral surface of the cylindrical container and the cylindrical container is pressed. In addition, both the thick and thin portions of the cylindrical container and the outer peripheral surface of the sleeve can be reliably adhered. Thereby, it becomes possible for the thick part and the thin part of the barrel part of the cylindrical container to obtain the same printing pressure.

  The can printing apparatus according to the present invention is characterized in that a radial difference between the small diameter portion and the large diameter portion is set to 0.04 mm or more and 0.1 mm or less.

  Further, the printing apparatus for a can according to the present invention is provided with a taper protrusion that protrudes toward the base end of the sleeve at a portion corresponding to the opening end of the trunk of the sleeve. It is characterized by that.

  In the forming process of the cylindrical container, the thin part is greatly heat-shrinked in comparison with the thick part at the time of the ironing process, so that the opening end on the thick part side may have a shape whose diameter is larger than that of the body part. When such a cylindrical container with an enlarged opening end is fitted onto the sleeve of the cylindrical container holding mandrel, and the blanket to which the ink has been transferred is pressed while sliding on the outer peripheral surface of the cylindrical container, the opening end is Since the outer diameter is large, even if the bottom side of the trunk portion makes a round, the opening end portion does not finish the round. That is, the open end is in a state where the length of one round is longer than that of the body. Further, since the opening end of the cylindrical container has an enlarged diameter, a relatively large clearance is generated between the opening end and the sleeve. When such a delay in rotation at the opening end and the occurrence of clearance with the sleeve occur at the same time, slipping may cause twisting of the cylindrical container and reduce the quality.

  Here, in the present invention, the clearance between the opening end of the cylindrical container and the sleeve is filled by providing a tapered protrusion at a portion of the sleeve of the cylindrical container holding mandrel corresponding to the opening end of the barrel of the cylindrical container. Therefore, twisting of the cylindrical container can be suppressed. Moreover, since this taper protrusion part protrudes so that it may expand toward the base end part of a sleeve, it does not become a hindrance when fitting a cylindrical container externally.

  Further, the cylindrical container holding mandrel of the present invention has a bottomed cylindrical shape, the opening end side is a thick part, and the sleeve part is inserted into the inside of the cylindrical container whose bottom part is a thin part, A cylindrical container holding mandrel for holding the cylindrical container, wherein the sleeve includes a small diameter portion formed on a proximal end side and a large diameter portion formed on a distal end side, the small diameter portion and the The boundary with the large diameter portion is a tapered diameter portion that expands from the small diameter portion toward the distal end side.

  Further, the printing method of the can according to the present invention transfers ink to a blanket provided on the outer periphery of a rotatable blanket cylinder, forms a bottomed cylindrical shape, the opening end side is a thick part, and the bottom part is a thin part. In the can printing method of printing a can on the outer periphery of the cylindrical container by externally fitting a cylindrical container having a body portion to a mandrel for holding the cylindrical container, and rotating the blanket in contact with the cylindrical container. The holding mandrel includes a sleeve to which the body portion is fitted, and the sleeve includes a small diameter portion formed on a proximal end side and a large diameter portion formed on a distal end side, and the small diameter portion The boundary with the large-diameter portion is a tapered diameter portion that expands from the small-diameter portion toward the distal end side, the small-diameter portion corresponds to the thick portion of the trunk portion, and the large-diameter portion is the The circle to correspond to the thin part of the trunk The container is characterized in that fitted on the cylindrical container holding mandrel.

  According to the printing apparatus, printing method, and cylindrical container holding mandrel of the present invention, when printing or coating is performed on the outer peripheral surface of the cylindrical container, the printing pressure can be made uniform, and the printing quality is improved. It becomes possible to make it.

It is the side view which showed the upper half of the cylindrical container holding mandrel in the printing apparatus of the can which concerns on one Embodiment of this invention in the cross section. It is a figure for demonstrating the structure of the internal diameter of a cylindrical container, and the outer diameter of a sleeve in the state which externally fitted the cylindrical container on the mandrel for cylindrical container holding | maintenance. It is a figure for demonstrating the structure of the internal diameter of a cylindrical container, and the outer diameter of a sleeve in the state which pressed the surface of the cylindrical container with the blanket. It is a schematic block diagram of the printing apparatus of a can.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The can printing apparatus according to the present embodiment has the same configuration as that shown in FIG. 4 and is characterized by its cylindrical container holding mandrel M. Accordingly, the can printing apparatus 30 according to this embodiment having the configuration shown in FIG. 4 will be described in detail, and the cylindrical container holding mandrel M, which is a characteristic part thereof, will be described in detail. FIG. 1 is a side view showing the upper half of a cylindrical container holding mandrel of a printing apparatus for a can according to an embodiment of the present invention in cross section.

  The cylindrical container holding mandrel M in the printing apparatus 30 for cans of this embodiment is for holding the cylindrical container 20 from the inside when printing on the outer peripheral surface of the cylindrical container 20, and is made of a resin such as PET100, PET200, Alternatively, a cylindrical sleeve 1 made of a steel body having a surface treated to add slipperiness such as DLC coating on the surface is provided. The sleeve 1 is formed with a hollow portion 1a that is hollowed out along the axis O and opens to the distal end side, and the rear end side of the sleeve 1 in the longitudinal direction is the proximal end portion 2. The distal end side is a sleeve main portion 3 having a diameter smaller than that of the base end portion 2.

  A bottomed cylindrical cylindrical container 20 made of aluminum or the like is vacuum-sucked through the cavity 1 a on the outer periphery of the sleeve main portion 3 of the sleeve 1, and the inner surface of the bottom portion 22 is the sleeve main portion 3 of the sleeve 1. It fits out so that it may contact the front-end | tip part.

  The cylindrical container 20 is subjected to DI processing on the opening end portion 23a side of the body portion 23 and molded into a bottle can. Specifically, as shown in FIG. 2, the opening end portion 23a of the body portion 23 is formed. The side is a thick portion 24 having a thickness that can withstand the forming process, and the bottom portion side of the body portion 23 is a thin portion 25 that is thinner than the thick portion 24.

  Further, the thick part 24 and the thin part 25 of the body part 23 are formed so that the outer diameters are straight, and the inner part has a smaller inner diameter than the thin part 25 according to the respective thicknesses. Has been. Further, a boundary formed between the thick portion 24 and the thin portion 25 in the body portion 23 so that the inner diameter of the thick portion 24 increases toward the bottom of the can and continues to the inner diameter of the thin portion 25. A portion 26 is formed. In such a cylindrical container 20 for forming a bottle can, the radius difference between the inner diameters of the thick part 24 and the thin part 25 is 0.04 to 0.1 mm.

  The outer diameter of the sleeve main portion 3 to which the body portion 23 of the cylindrical container 20 is attached has different sizes on the distal end side and the proximal end side so as to follow the inner diameter of the cylindrical container 20. ing. That is, the outer diameter of the sleeve main portion 3 is smaller than the outer diameter of the portion on the proximal end portion 2 side corresponding to the thick portion 24 of the barrel portion 23 of the cylindrical container 20 and corresponding to the thin portion 25. In this way, the base end 2 side is a small diameter portion 3a and the tip end side is a large diameter portion 3b. The radius difference between the outer diameters of the small diameter portion 3a and the large diameter portion 3b is set to 0.04 to 0.1 mm corresponding to the radius difference between the thick portion 24 and the thin portion 25 of the cylindrical container 20. ing. The boundary between the small diameter portion 3a and the large diameter portion 3b is a tapered diameter portion 3c formed so as to expand from the small diameter portion 3a toward the distal end side and continue to the small diameter portion 3a.

  The cylindrical container 20 is mounted on the sleeve main part 3 between the outer diameter of the sleeve main part 3 having the small diameter part 3a, the large diameter part 3b and the tapered diameter part 3c and the inner diameter of the cylindrical container 20. The outer diameter of the sleeve 1 is set so that a slight clearance is provided.

  Further, the clearance l between the small diameter portion 3 a and the thick portion 24 and the clearance m between the large diameter portion 3 b and the thin portion 25 are the same, and the gap between the tapered diameter portion 3 c and the boundary portion 26 is the same. The outer diameter of the sleeve main portion 3 is set so that the clearance n is smaller than the clearance l and the clearance m, preferably in the range of 0.01 to 0.05 mm.

  Further, the outer diameter of the small diameter portion 3a of the sleeve main portion 3 is increased in diameter toward the base end portion at a portion corresponding to the open end portion 23a of the cylindrical container 20 of the sleeve main portion 3. A protruding taper protrusion 3d is formed. The projecting amount of the taper projection 3d from the small diameter portion 3a toward the outside in the radial direction is set to be larger than the thickness difference between the thick portion 24 and the thin portion 25, for example, the thick portion 24 and the thin portion. 2 to 3 times the wall thickness difference from 25. Further, the range of about 3 to 10 mm from the open end 23a toward the bottom 22 in the cylindrical container 20 is a non-printing portion P where the blanket 35 provided on the outer periphery of the blanket cylinder 32 does not come into contact, and the taper protrusion The length of 3d in the direction of the axis O corresponds to the non-printing portion P and is set to have a dimension of about 3 to 10 mm from the open end 23a of the cylindrical container 20 toward the bottom 22 of the cylindrical container. .

  The cylindrical container holding mandrel M configured as described above is externally fitted by vacuum suction of the hollow part 1a, and the inserted cylindrical container 20 is evacuated. Firmly held.

  The cylindrical container 20 held by the cylindrical container holding mandrel M is rotated by a rotation of the cylindrical container holding mandrel turret 34 to a position facing the blanket 35 disposed on the outer periphery of the blanket cylinder 32 of the can printing apparatus 30. The blanket 35 is pressed and rotated to perform predetermined printing on the outer peripheral surface of the cylindrical container 20. After the printing on the cylindrical container 20 is completed, the cylindrical container holding mandrel turret 34 is rotated at a predetermined angle, and the cylindrical container 20 is removed from the cylindrical container holding mandrel M.

  In the cylindrical container holding mandrel M in the printing apparatus 30 of such a can, clearances l, m, and n are provided between the outer diameter of the sleeve main portion 3 of the sleeve 1 and the inner diameter of the body portion 23 of the cylindrical container 20. Therefore, the sleeve 1 can be easily inserted into the cylindrical container. Further, since the outer diameter of the sleeve main portion 3 is a small diameter portion 3a, a large diameter portion 3b, and a tapered diameter portion 3c that follow the difference in inner diameter between the thick portion 24 and the thin portion 25 of the cylindrical container 20, When the blanket 35 is brought into sliding contact with the outer peripheral surface of the cylindrical container 20 during printing and the cylindrical container 20 is pressed, the clearances l, m, and n disappear due to the printing pressure as shown in FIG. The inner diameters of the thick part 24, the thin part 25, and the boundary part 26 and the outer diameter of the sleeve main part 3 can be reliably adhered. Thereby, the thick portion 24 and the thin portion 25 of the body portion 23 of the cylindrical container 20 can obtain the same printing pressure.

  In addition, the boundary portion 26 located between the thick portion 24 and the thin portion 25 is more likely to disperse the printing pressure as compared with other portions, but the clearance n of this boundary portion 26 is the clearances l and m of other portions. Is preferably smaller than 0.01 to 0.05 mm. Therefore, when the blanket 35 is slidably pressed against the outer peripheral surface of the cylindrical container 20, the clearance n disappears quickly and this boundary The portion 26 is in close contact with the tapered diameter portion 3c of the sleeve main portion 3, and the printing pressure can be obtained more effectively than the other portions. Accordingly, since the printing pressure can be reliably obtained also at the boundary portion 26, it is possible to effectively obtain a uniform printing pressure from the blanket 35 on the entire outer peripheral surface of the cylindrical container 20. If the clearance n is larger than the clearances l and m by 0.05 mm or more, the printing pressure is excessively applied and the ink is crushed and deeply expressed in the printing of the taper diameter portion 3c. Since it is set in the above range, printing can be performed well even at the tapered diameter portion 3c.

  Further, since the clearances l and m of the thick portion 24 and the thin portion 25 are the same, both the thick portion 24 and the thin portion 25 of the cylindrical container 20 and the outer periphery of the sleeve main portion 3 are used. The surface can be more uniformly adhered, and the same printing pressure can be obtained.

  In the forming process of the cylindrical container 20, the thinned portion 25 is greatly heat-shrinked compared to the thickened portion 24 during the ironing process, so that the opening end 23 a on the thickened portion 24 side has a larger diameter than the barrel portion 23. The shape may become. When the cylindrical container 20 having such an enlarged opening end 23a is externally fitted to the sleeve main portion 3 of the sleeve 1 and the blanket 35 to which the ink has been transferred is pressed while sliding on the outer peripheral surface of the cylindrical container 20, Since the opening end portion 23a has a large outer diameter, even if the bottom portion 22 side of the body portion 23 makes a round, the opening end portion 23a does not end once. That is, the open end 23 a is in a state where the length of one round is longer than that of the body 23. Furthermore, since the diameter of the open end 23 a of the cylindrical container 20 is increased, a relatively large clearance is generated between the open end 23 a and the sleeve main portion 3. When such a long peripheral length at the open end 23a and the occurrence of clearance with the sleeve 1 occur at the same time, the cylindrical container 20 may be twisted by slipping and the quality may be deteriorated.

  In the present embodiment, since the tapered protrusion 3d is provided in a portion corresponding to the opening end 23a of the body 23 of the cylindrical container 20 of the sleeve main portion 3, the opening end 23a of the cylindrical container 20 and the sleeve Since the clearance with the main part 3 can be filled, the twist of the cylindrical container 20 can be suppressed. Further, since the taper protrusion 3d protrudes toward the base end portion 2 of the sleeve 1 so as to increase in diameter, it does not hinder the external fitting of the cylindrical container 20. Furthermore, since the protruding amount of the taper protrusion 3d is set to be larger than the radius difference between the inner diameters of the thick portion 24 and the thin portion 25, the cylindrical container 20 is externally fitted regardless of whether or not the blanket 35 is pressed. At this stage, the clearance between the open end 23a of the cylindrical container 20 and the sleeve 1 is filled, and the occurrence of twisting of the cylindrical container can be further prevented.

  Further, when the taper protrusion 3d is smaller than twice the thickness difference between the thick portion 24 and the thin portion 25, the slip is likely to occur, and the twist of the cylindrical container 20 is likely to occur. On the other hand, if the taper protrusion 3d is larger than three times the thickness, the taper protrusion 3d causes the opening end 23a of the cylindrical container 20 to bend in the outer diameter direction, adversely affecting subsequent processes such as necking. Effect. In the present embodiment, since the taper protrusion 3d is set to 2 to 3 times the thickness difference, printing can be performed smoothly without the above-described problems.

  In addition, this taper protrusion part 3d is formed in the range of about 3-10 mm toward the bottom part 22 of the cylindrical container from the opening end part 23a of the cylindrical container 20 corresponding to the non-printing part P which the blanket 35 does not contact. Therefore, it does not affect printing.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the present invention. In the above example, the cylindrical container 20 is used for forming a bottle can having a radius difference between the inner diameter of the thick portion 24 and the thin portion 25 of about 0.04 to 0.1 mm, but is not limited thereto. Alternatively, by setting the outer diameter of the sleeve 1 so as to follow the inner diameter of the cylindrical container, it can be used for a cylindrical container for forming a normal can having a radius difference of about 0.04 to 0.06 mm, for example. is there.

DESCRIPTION OF SYMBOLS 1 Sleeve 3 Sleeve main part 3a Small diameter part 3b Large diameter part 3c Tapered diameter part 3d Tapered protrusion part 20 Cylindrical container 23 Trunk part 24 Thick part 25 Thin part 26 Boundary part 30 Can printing device 32 Blanket cylinder 35 Blanket M Cylindrical container Holding mandrel

Claims (5)

A rotatable blanket cylinder having a blanket to which ink is transferred on the outer periphery, and a cylindrical container holding mandrel arranged so as to be in contact with the outer periphery of the blanket cylinder, the blanket having the cylindrical container holding mandrel In a printing apparatus for a can that performs printing on the outer periphery of a cylindrical container by contacting and rotating the externally fitted cylindrical container,
The cylindrical container has a trunk portion whose opening end side is a thick portion and whose bottom portion is a thin portion,
The cylindrical container holding mandrel includes a sleeve to which the body portion is fitted, and the sleeve includes a small diameter portion formed on a proximal end side and a large diameter portion formed on a distal end side, A printing apparatus for a can characterized in that a boundary between the small diameter portion and the large diameter portion is a tapered diameter portion that expands from the small diameter portion toward the tip side.   The can printing apparatus according to claim 1, wherein a radius difference between the small diameter portion and the large diameter portion is set to 0.04 mm or more and 0.1 mm or less.   The taper protrusion part which protrudes so that a diameter may be expanded toward the base end part of the said sleeve is provided in the part corresponding to the opening edge part of the said trunk | drum of the said sleeve. The printing apparatus for cans as described. A cylindrical container holding mandrel that holds a cylindrical container by inserting a sleeve inside the barrel of the cylindrical container that has a bottomed cylindrical shape, the open end is a thick part, and the bottom is a thin part. There,
The sleeve includes a small diameter portion formed on the proximal end side and a large diameter portion formed on the distal end side, and a boundary between the small diameter portion and the large diameter portion extends from the small diameter portion to the distal end side. A mandrel for holding a cylindrical container, wherein the mandrel has a tapered diameter portion that expands in diameter. Ink is transferred to a blanket provided on the outer periphery of a rotatable blanket cylinder, and a cylindrical container having a cylindrical portion having a bottomed cylindrical shape with a thickened portion at the open end side and a thinned portion at the bottom side In a printing method for a can that is fitted on a holding mandrel and printed on the outer periphery of the cylindrical container by rotating the blanket in contact with the cylindrical container,
The cylindrical container holding mandrel includes a sleeve to which the body portion is fitted, and the sleeve includes a small diameter portion formed on a proximal end side and a large diameter portion formed on a distal end side, The boundary between the small diameter portion and the large diameter portion is a tapered diameter portion that expands from the small diameter portion toward the tip side,
The cylindrical container is externally fitted to the cylindrical container holding mandrel so that the small diameter portion corresponds to a thick portion of the trunk portion and the large diameter portion corresponds to a thin portion of the trunk portion. How to print cans.

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