JP6381377B2 - Printing plate - Google Patents

Description

  The present invention relates to a printing plate used for printing a metal, especially an aluminum alloy beverage can.

  2. Description of the Related Art Conventionally, it is known that printing is performed on a metal can using a printing plate that is mounted on a cylinder of a printing apparatus and has an image pattern.

  In Patent Document 1, in order to determine the relative position in the circumferential direction and the relative position in the axial direction between the printing plate and the cylinder, an opening is formed toward the axial end of the cylinder formed by the sleeve body. There is disclosed a printing plate provided with a plurality of positioning notches that are engaged with a guide member provided on the sleeve body in the circumferential direction of the sleeve body.

JP 2012-254623 A

  However, in the configuration of the positioning notch described in Patent Document 1, the strength of the end of the positioning notch that comes into contact with the guide member is slightly insufficient, so that the positioning notch is engaged with the guide member. When they are combined, there has been a problem that plastic deformation occurs at the end of the positioning notch.

  In view of the above-described technical background, an object of the present invention is to provide a printing plate that is used for printing metal cans, particularly aluminum alloy beverage cans, with reduced risk of deformation during mounting.

  That is, this invention has the structure as described in following [1]-[8].

[1] A printing plate that is mounted on a cylindrical plate cylinder and formed into a cylindrical shape and used.
A plate body made of a metal plate,
A positioning cutout portion provided at an end of the plate main body and formed with a notch engageable with a positioning projection provided on the plate cylinder;
A reinforcing part that is integrally formed with the plate body and reinforces the positioning notch;
A printing plate characterized by comprising:

  [2] The printing plate according to item 1, wherein the reinforcing portion is formed along the periphery of the positioning notch.

  [3] The printing plate according to item 1 or 2, wherein the reinforcing portion is formed with a bead portion.

  [4] The reinforcing portion is provided at a predetermined interval from an end portion of the positioning notch, and a convex bead portion is formed on the outer peripheral surface of the plate body. 4. A printing plate according to any one of items 1 to 3.

  [5] The above-mentioned item 2, wherein the reinforcing portion is formed continuously from the periphery of the positioning notch along the end of the plate main body that is continuous with the positioning notch. Printable version.

  [6] The printing plate according to item 1, wherein the reinforcing portion is formed with a bent portion formed by bending an edge portion of the positioning notch.

  [7] The printing plate according to item 6, wherein the bent portion is formed by bending an edge of the positioning cutout portion outward.

  [8] The printing plate according to any one of items 1 to 7 above, wherein the printing plate is a plate for printing a can body, in which only one plate portion is provided on the outer peripheral surface of the plate body.

  According to the invention described in [1] above, a printing plate is used which is mounted on a cylindrical plate cylinder and formed into a cylindrical shape, and includes a plate main body made of a metal plate material, and an end of the plate main body. A positioning notch formed by forming a notch engageable with a positioning projection provided on the plate cylinder, a reinforcing portion that is integrally formed with the plate body and reinforces the positioning notch, Therefore, the strength of the positioning notch is increased by being reinforced by the reinforcing portion, and the possibility of deformation due to engagement with the positioning protrusion is reduced.

  Further, the reinforcing portion is not provided as a separate member from the plate main body, but is integrally formed with the plate main body, so that there is no possibility that the reinforcing portion falls off.

  According to the invention described in [2] above, since the reinforcing portion is formed along the periphery of the positioning notch, the strength around the positioning notch is improved and the positioning notch is provided. It is possible to prevent deformation such as bending of the portion on the other side along the axial direction.

  According to the invention described in [3] above, since the reinforcing portion is formed with the bead portion, the reinforcing portion can be easily formed.

  According to the invention described in [4] above, the reinforcing portion is provided at a predetermined interval from the end of the positioning notch, and the convex bead portion is formed on the outer peripheral surface of the plate body. Therefore, the portion between the positioning notch portion and the bead portion of the plate body is formed to bend in the opposite direction (radially inner side) to the convex direction (radially outer side) of the bead portion. When the positioning notch is engaged with the portion, there is no possibility that the positioning notch gets over the positioning protrusion.

  According to the invention described in [5] above, the reinforcing portion is formed continuously from the periphery of the positioning notch along the end of the plate body that is continuous with the positioning notch. By providing a notch for positioning on the printing plate, the end of the plate main body that is continuous with the inlet portion of the notch for positioning is reinforced by the reinforcing portion because the strength of the portion is insufficient and deformation is likely to occur. Therefore, it is possible to prevent deformation occurring at the end portion of the plate body and to follow the peripheral surface of the plate cylinder.

  According to the invention described in [6] above, since the reinforcing portion is formed with a bent portion formed by bending the edge portion of the positioning notch portion, the reinforcing portion is bent at the edge portion of the positioning notch portion of the plate body. The strength of the positioning notch can also be increased by processing.

  According to the invention described in [7] above, the bent portion is formed by bending the edge portion of the positioning cutout portion outward, so that the inner peripheral surface of the printing plate including the positioning cutout portion is formed. By being configured to be in contact with the outer peripheral surface of the plate cylinder, the positioning notch is formed by the thickness of the portion bent inward as in the case where the edge of the positioning notch is bent inward. The printing plate is smoothly mounted on the plate cylinder without causing the printing plate to be deformed near the notch for positioning, which should come into contact with the outer surface of the plate cylinder. be able to.

  According to the invention described in [8] above, since the plate for printing the can body is provided with only one plate portion on the outer peripheral surface of the plate body, the positioning notch portion is likely to be bent. Even in the case of a printing plate having a small diameter, the strength around the notch for positioning is improved by forming the reinforcing portion and can be reliably engaged with the positioning projection.

It is explanatory drawing for demonstrating the printing plate of this invention. It is explanatory drawing for demonstrating mounting | wearing to the plate_cylinder | printing_drum of the printing plate of this invention. It is explanatory drawing for demonstrating mounting | wearing to the plate_cylinder | printing_drum of the printing plate of this invention. It is the top view and AA sectional view of the reinforcement part provided in the printing plate of this invention. It is a top view of the notch part for positioning provided in the printing plate which concerns on another embodiment of this invention, and a reinforcement part. It is explanatory drawing of the reinforcement part provided in the printing plate which concerns on another embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory diagram for explaining the printing plate 1, FIGS. 2 and 3 are explanatory diagrams for explaining the mounting of the printing plate 1 to the plate cylinder 2, and FIG. FIG. 5 is a plan view of the reinforcing portion 15 provided and a cross-sectional view taken along the line AA. FIG. 5 is a plan view of the positioning notch 14 and the reinforcing portion 15 provided in the printing plate 1 according to another embodiment. It is explanatory drawing of the reinforcement part 35 provided in the printing plate 3 which concerns on another embodiment.

  First, with reference to FIGS. 1-4, the plate mounting apparatus provided with the cylindrical printing plate 1 with which the plate cylinder 2 was mounted | worn is demonstrated.

  In the following, the upper and lower sides of the plate cylinder 2 shown in FIG.

  The plate mounting apparatus is commonly provided in a printing machine that performs printing on a printing object and a engraving machine that engraves a printing pattern on a printing plate 1 used in the printing machine.

  As the printing plate 1 mounted on the plate cylinder 2, a printing plate 1 formed in a cylindrical shape, particularly a printing plate 1 having a small diameter is used.

  The substrate to be printed is a beverage metal can, and in particular, a bottomed cylindrical beverage metal can formed by drawing and ironing (DI) a flat plate made of aluminum or an aluminum alloy is suitably printed.

  The plate mounting device includes a plate drive shaft (not shown) provided so as to protrude forward from the machine frame of the printing press, and a plate that is fitted from the tip end side of the plate drive shaft and is fixed to the outer peripheral surface of the plate drive shaft. And a torso 2.

  The plate drive shaft is supported at its base end by a machine frame of a printing press and is rotated at a predetermined speed in a predetermined direction by a known driving means.

  The plate cylinder 2 is formed in a cylindrical shape, and an insertion hole through which the plate drive shaft is inserted is provided at the center thereof.

  A cylindrical plate mounting surface 22 concentric with the plate drive shaft is formed on the outer periphery of the plate cylinder 2, and a printing plate 1 described later is detachably provided on the plate mounting surface 22.

  The plate cylinder 2 has a hollow portion with the inside removed for weight reduction, and includes a cylindrical portion in which a plate mounting surface 22 is formed on the outer periphery, and a lid portion 26 that covers the front surface of the plate cylinder 2. Yes.

  The plate cylinder 2 is fixed to the plate drive shaft with the plate drive shaft fitted in the insertion hole, and rotates integrally with the plate drive shaft.

  The plate mounting surface 22 preferably maintains static friction with a surface roughness of about Ra 1 μm or less in order to secure a fixing force due to frictional resistance with the inner surface of the mounted printing plate 1.

  Further, considering that the surface roughness is kept small and the surface is hardly damaged, it is preferable that the plate mounting surface 22 be hard chrome coated (plated).

  The printing plate 1 includes a plate body 11 formed in a cylindrical shape with an elastic material, and a plate portion 12 formed on a part of the outer peripheral portion of the plate body 11.

  The plate body 11 is formed by forming a sheet made of an elastic material into a cylindrical shape and overlapping and joining both ends, and the plate portion 12 is formed at a predetermined position on the outer peripheral surface of the plate body 11 excluding the joint portion 13. Is provided.

  The elastic material sheet is made of a rectangular elastic material sheet such as an appropriate magnetic or nonmagnetic metal. For example, a commercially available tin plate (Fe) is adopted, and the thickness of the sheet can be formed in a cylindrical shape. In this example, the thickness is about 0.26 mm.

  The plate body 11 is formed with a resin layer to be the plate portion 12 on one side, and this resin layer can employ, for example, a resin such as polyvinyl alcohol, vinyl ester, or polyamide. For example, a hardness of about D20 to 80 after curing is suitable.

  For example, if a UV curable resin (ultraviolet curable resin) is used for normal offset printing, it does not require complicated cleaning work with other solvents such as curable resin or high-pressure steam. It can be performed.

  The resin layer only needs to have a thickness necessary for the printing plate portion 12. In this example, a layer having a thickness of 0.4 to 0.6 mm is bonded to one side of the elastic material sheet.

  The printing plate 1 formed in a cylindrical shape is mounted on the plate mounting surface 22 which is the outer peripheral surface of the plate cylinder 2 by being fitted from the front end side of the plate cylinder 2.

  The plate portion 12 of the printing plate 1 is formed on the outer surface portion of the plate body 11 that is in close contact with the plate mounting surface 22 when the printing plate 1 is mounted on the plate cylinder 2.

  The plate cylinder 2 is provided with a plate fixing member mounting surface 23 in which a part of the cylindrical portion is removed to form a flat surface (see FIG. 3), and the plate fixing member mounting on the outer periphery of the cylindrical portion is provided. A portion excluding the surface 23 is a plate mounting surface 22 on which the printing plate 1 is mounted.

  As will be described in detail later, the plate fixing member mounting surface 23 is provided with a plate fixing member 24 for fixing the printing plate 1 provided on the outer peripheral surface of the plate cylinder 2 so as to be movable inward and outward in the radial direction. Yes.

  The plate fixing member mounting surface 23 is located on the radially inner side of the cylindrical surface including the plate mounting surface 22.

  The outer diameter of the plate mounting surface 22 and the inner diameter of the printing plate 1 are set to have substantially the same dimensions.

  Since the plate cylinder 2 has the plate fixing member mounting surface 23, the total circumference of the plate mounting surface 22 and the plate fixing member mounting surface 23 is the circumference of the cylindrical surface formed by the plate mounting surface 22 of the plate cylinder 2. Shorter than the length.

  The peripheral length of the inner peripheral surface of the printing plate 1 is slightly larger than the total peripheral length of the plate mounting surface 22 and the plate fixing member mounting surface 23 of the plate cylinder 2, so that the plate mounting surface 22 of the plate cylinder 2 is formed. The dimension is set slightly smaller than the circumferential length of the cylindrical surface.

  This facilitates the insertion of the printing plate 1 into the plate cylinder 2 and avoids the situation where the portion pressed by the plate fixing member 24 protrudes radially outward from the other portions of the printing plate 1. Be able to.

  The plate fixing member mounting surface 23 is formed with a groove portion that is formed in a rectangular shape that is long in the axial direction over most of the axial length of the plate fixing member mounting surface 23.

  The groove has a square cross-sectional shape, and both side walls and the bottom wall are formed as flat surfaces.

  A plate fixing member 24 is fitted in the groove so as to be movable in the radial direction of the plate cylinder 2. The plate fixing member 24 is provided with a rotation shaft extending in the axial direction of the plate cylinder 2, for example. Yes.

  The rotation shaft is configured to be rotatable inside the plate fixing member 24. For example, the rotation shaft extends in the axial direction of the plate cylinder 2 so as to penetrate the front lid portion 26 from the rear surface side of the plate cylinder 2. Yes.

  The distal end portion of the rotation shaft is provided with an operation portion 27 that is penetrated through the lid portion 26 on the front surface of the plate cylinder 2 and is operated by being pinched when the rotation shaft is rotated.

  The plate fixing member 24 is configured to be movable in the radial direction of the plate cylinder 2 inside the plate cylinder 2 in accordance with the rotation of the rotation shaft when the operation unit 27 is operated.

  The plate fixing member 24 is formed in a rectangular shape that is long in the axial direction, and is fitted into a groove formed in the plate fixing member mounting surface 23 so as to be movable in the radial direction of the plate cylinder 2.

  The plate fixing member 24 fits in the circumferential direction and the axial direction with almost no gap to the axial end walls of the groove portion of the plate cylinder 2, and the diameter of the plate cylinder 2 is parallel to the surfaces of the circumferential side walls and the axial end walls. Move in the direction.

  An end surface 241 on the outer side in the radial direction of the plate fixing member 24 is formed of a cylindrical surface having the same curvature as the plate mounting surface 22 or a similar degree of curvature.

  The end surface 241 on the radially outer side of the plate fixing member 24 is preferably formed of a cylindrical surface having the same curvature as the plate mounting surface 22 or a similar degree of curvature, but is flat and parallel to the plate fixing member mounting surface 23. It may be formed by a surface.

  The plate fixing member 24 is a part of the printing plate 1 mounted on the plate cylinder 2 from the inside in the radial direction within the range of the inside of the cylindrical surface formed by the outer surface including the plate portion 12 of the printing plate 1. The diameter is increased by pushing outward in the direction.

  An end stopper 25 for determining the mounting position of the printing plate 1 in the axial direction is fixed to the outer peripheral portion of the rear end surface of the cylindrical portion of the plate cylinder 2.

  The end stopper 25 is formed in an annular shape that slightly protrudes radially outward from the plate mounting surface 22.

  The end stopper 25 is configured such that when the printing plate 1 is fitted from the front end side of the plate cylinder 2, the rear end side of the printing plate 1 abuts.

  By providing the end stopper 25, the rear end portion of the printing plate 1 can be accurately and easily attached to a predetermined position of the plate cylinder 2.

  On the lower side of the plate cylinder 2 and on the front side of the end stopper 25, at least a circumferential positioning projection 21 for positioning the printing plate 1 in the circumferential direction is provided.

  The circumferential positioning protrusion 21 protrudes slightly outward in the radial direction of the plate cylinder 2, for example, and a substantially semicircular step portion is formed in plan view.

  In the printing plate 1, a positioning notch 14 is formed at an end portion 111 on the rear end side when the printing plate 1 is mounted on the plate mounting surface 22 of the plate cylinder 2, and engages with the positioning protrusion 21 of the plate cylinder 2. It is like that.

  The positioning notch 14 is formed with a notch extending in the axial direction of the printing plate 1, and an arcuate part 141 having a curvature matching the outer peripheral shape of the circumferential positioning projection 21 is formed at the back end thereof. Has been.

  When the printing plate 1 is mounted to the rear end side of the plate cylinder 2, the arc portion 141 of the positioning notch 14 abuts on the stepped portion of the positioning projection 21, thereby causing the circumferential direction of the printing plate 1 and The plate cylinder 2 can be positioned in the axial direction.

  Referring to FIG. 4 in detail, the positioning notch portion 14 includes an arc portion 141 formed by notching the longitudinal end portion 111 of the printing plate 1 with a predetermined diameter dimension, and an arc portion of the arc portion 141. A straight line 142 formed so that a straight line in contact with the longitudinal end 111 of the printing plate 1 perpendicularly intersects, and a corner formed by the straight 142 and the longitudinal end 111 of the printing plate 1 is cut off. And an inclined portion 143 formed in this manner.

  For example, when the diameter dimension of the arc portion 141 is set to 6 mm, the interval between the positioning notches 14 (the distance between the left and right straight portions 142) is set to 6 mm, which is the same as the diameter dimension of the arc portion 141.

  The inclined portion 143 is formed at a predetermined inclination angle with respect to the symmetry axis of the positioning cutout portion 14 that passes through the center point of the arc portion 141.

  In this example, the corner portion formed by the straight portion 142 and the end portion 111 of the printing plate 1 has an inclination angle of about 30 ° with respect to the symmetry axis of the positioning notch portion 14 passing through the center point of the arc portion 141. And the inclined portion 143 is formed.

  The positioning notch 14 is provided with an inclined portion 143 in a continuous portion between the end 111 of the plate body 11 and the positioning notch 14, thereby engaging the positioning protrusion 21 with the positioning notch 14. When positioning, the positioning projection 21 can be smoothly guided to the arc portion 141 side, and the positioning projection 21 and the positioning notch 14 can be easily engaged.

  When the printing plate 1 is wound, a cutout portion such as the positioning cutout portion 14 provided in the plate main body 11 becomes a portion that is easily deformed such as bending due to insufficient strength than other portions. However, by forming the bead portion 15 in which the curved portion 151 and the straight portion 152 are continuous, it is possible to increase the strength of a portion where the strength is insufficient and deformation is likely to occur.

  If the dimension of the positioning notch 14 is too large, it may overlap the printed part. If the dimension is too small, the positioning notch 14 may be difficult to engage with the positioning projection 21. It is preferable that the clearance of the positioning cutout portion 14 with respect to the portion 21 is a dimension that is set to 0 μm to 100 μm.

  The positioning notch portion 14 is provided with a reinforcing portion 15 that reinforces the positioning notch portion 14 in order to prevent deformation of the shape due to contact with the positioning projection 21.

  The reinforcing portion 15 is not formed by joining or fitting another member to the plate main body 11, but is formed by processing the plate main body 11 itself, that is, integrally formed with the plate main body 11. Is.

  Here, the reinforcement part 15 which consists of a convex or concave bead part is demonstrated as an example.

  As shown in FIG. 4A, the bead portion 15 is provided around the positioning notch portion 14 so as to surround the positioning notch portion 14 at a predetermined interval from the end portion 14a of the positioning notch portion 14. It is formed along (curved part 151).

  Since the reinforcing portion 15 is formed along the periphery of the positioning notch portion 14, the strength of the periphery of the positioning notch portion 14 is improved, and the portion on the side where the positioning notch portion 14 is provided extends in the axial direction. It is possible to prevent deformation such as bending along.

  The bead portion 15 has a curved portion 151 concentrically formed with the positioning cutout portion 14, and the end portion of the curved portion 151 extends along the end portion 111 of the printing plate 1, for example, from the end portion of the curved portion 151. It is provided extending in a length of about 1.9 mm (straight line portion 152).

  In this example, the curved portion 151 and the straight portions 152 provided on both sides thereof are provided as the bead portions 15 formed continuously.

  If the shape of the bead part 15 is explained in full detail based on AA sectional drawing of FIG.4 (b), the bead part 15 will be formed in convex shape with respect to the outer peripheral surface of the plate main body 11. FIG.

  The bead portion 15 is spaced from the end portion 14a of the positioning cutout portion 14 at a predetermined interval, for example, a male mold formed in a convex shape is pressed against the plate body 11, and protrudes from the outer peripheral surface of the plate body 11. A shaped bead portion 15 is formed.

  When the male mold is pressed against the plate body 11, the edge 16 of the positioning notch 14 from the end 14a of the positioning notch 14 to the bead 15 is in the direction in which the male mold is pushed as shown in the figure. It is deformed so as to be pulled, and is deformed so as to slightly protrude toward the inside of the plate body 11.

  If the interval between the edge portions 16 of the positioning cutout portion 14 is too wide, the amount of deformation protruding inward of the plate body 11 is reduced, and if it is too narrow, the edge portion 16 protrudes in the convex direction of the bead portion 15 (radially outward). ) Is not preferable.

  Therefore, the interval between the edge portions 16 is set in a range of 0.5% to 3.0% of the width dimension of the positioning cutout portion 14 in the longitudinal direction of the plate body 11, and preferably 1.0% to 2.5%. More preferably, it is set in the range of 1.5% to 2.0%.

  If the width dimension of the bead portion 15 is too wide with respect to the distance from the end portion 111 of the plate body 11 to the plate portion 12, the distance between the bead portion 15 and the plate portion 12 of the plate body 11 is reduced. If the distance from the end portion 111 of the plate body 11 to the plate portion 12 is too narrow, the edge 16 is unlikely to be deformed so as to slightly protrude toward the inside of the plate body 11. It is not preferable.

  Therefore, the width dimension of the bead portion 15 is set in a range of 0.5% to 3.0% of the width dimension of the positioning notch portion 14 in the longitudinal direction of the plate body 11, and preferably 1.0% to 2.5%. %, More preferably in the range of 1.5% to 2.0%.

  Since the reinforcement part 15 is formed with a bead part, the reinforcement part 15 can be easily formed.

  Further, the reinforcing portion 15 is provided with a predetermined interval from the end portion 14 a of the positioning cutout portion 14, and the convex bead portion 15 is formed on the outer peripheral surface of the plate main body 11. Since the portion between the positioning notch portion 14 and the bead portion 15 of the plate body 11 is formed so as to bend in the direction (radially inner side) opposite to the convex direction (radially outer side) of the bead portion 15, positioning is performed. When the positioning notch portion 14 is engaged with the positioning projection 21, there is no possibility that the positioning notch portion 14 gets over the positioning projection 21.

  Further, if the reinforcing portion 15 is configured to be continuously formed from the periphery of the positioning notch 14 along the end 111 of the plate body 11 that is continuous with the positioning notch 14, it is for cylindrical printing. The end portion 111 of the plate body 11 that is continuous with the inlet portion of the positioning notch portion 14 and is easily deformed due to the lack of the strength of the portion due to the positioning notch portion 14 provided in the plate 1 is formed by the reinforcing portion 15. By being reinforced, it is possible to prevent deformation at the end 111 of the plate body 11 and to follow the peripheral surface of the plate cylinder 2.

  A method for manufacturing the printing plate 1 will be described.

  A sheet made of an elastic material having a resin layer to be a plate 12 formed on one side is cut into a rectangular shape having a predetermined size, and a positioning notch is formed at a substantially central portion of one longitudinal end portion 111 of the unfolded elastic material sheet. 14 is formed.

  For example, the positioning notch 14 is notched by a cutter having a circular arc having a diameter of 6 mm to form the arc 141, and then a straight line in contact with the arc of the arc 141 is the end 111 of the printing plate 1. The straight portions 142 are formed by the cutters so as to intersect perpendicularly with each other.

  Subsequently, the corner portion formed by the straight portion 142 and the end portion 111 of the printing plate 1 is cut off at a predetermined inclination angle with respect to the symmetry axis of the positioning cutout portion 14 passing through the center point of the arc portion 141. An inclined portion 143 is formed.

  Here, the arc portion 141, the straight portion 142, and the inclined portion 143 have been described as being formed in order. However, the positioning notch portion is formed by using a punching die simulating the shape of the desired positioning notch portion 14 in advance. 14 may be formed.

  Next, the bead portion 15 includes a curved portion 151 that surrounds the positioning cutout portion 14, and a linear portion 152 whose end portion extends along the end portion 111 of the plate body 11. On the other hand, it is formed to be convex.

  For example, by using a male mold capable of forming the bead section 15 in which the curved section 151 and the straight section 152 are continuous, the male mold is pressed against the inner surface of the plate body 11 and press-molded. A convex bead portion 15 is obtained with respect to the outer peripheral surface of the plate body 11.

  Of the resin layer formed on one side of the sheet made of an elastic material, the portion to be the plate portion 12 is irradiated with ultraviolet rays to be cured by ultraviolet rays, and the uncured portion that becomes the non-plate portion that does not become the plate portion 12 is washed away with water and removed. To do.

  After the resin layer is dried, ultraviolet rays are post-irradiated so that no uncured portion remains on the plate portion 12.

  In this example, one plate portion 12 is formed in a portion of the outer peripheral surface of the plate body 11 excluding a predetermined width from the joint portion 13 and the longitudinal end portion 111.

  Irradiation of ultraviolet rays to the plate part 12 is performed only on the printing part of the printing part 12 where the printing pattern is formed, and when the printing part 12 includes a non-printing part where the printing pattern is not formed, It is desirable to remove the resin layer together with the non-printing part without irradiating the non-printing part with ultraviolet rays.

  Next, the plate body 11 is wound around a plate winding machine with the surface on which the resin layer is not formed on the inside, and is rolled into a cylindrical shape.

  The printing plate 1 formed into a cylindrical shape is obtained by joining both ends of the plate main body 11 wound in a cylindrical shape by the plate winding machine.

  As a method for joining both ends of the elastic material sheet, welding is most preferred, but there is no particular limitation as long as an adhesion method that does not easily peel off is employed.

  As described above, a configuration in which the reinforcing portion 15 is provided so as to surround the positioning notch portion 14 and along the longitudinal end portion 111 of the plate body 11 continuous with the positioning notch portion 14 is preferable. The configuration is not limited.

  For example, as shown in FIG. 5 (a), the reinforcing plate 15 is not provided with the straight portion 152 along the longitudinal end 111 of the plate body 11, and only the positioning notch portion 14 is continuously surrounded. A reinforcing portion (bead portion) 17 composed only of a convex curve portion 171 with respect to the outer peripheral surface of the main body 11 may be formed.

  In addition to the bead portion 15 including the curved portion 151 and the straight portion 152 and the bead portion 17 including only the curved portion 171 described above, the outer peripheral surface of the plate main body 11 is surrounded by the positioning notch portion 14. Further, a bead portion formed by dividing the convex shape may be provided, or a bead portion formed by dividing the convex shape with respect to the outer peripheral surface of the plate body 11 may be provided over the curved portion 151 and the straight portion 152. The bead portion may be provided only on the straight portion 152, or the bead portion may be provided locally on the curved portion 151 or the straight portion 152. At least the positioning notch portion 14 or the positioning notch portion 14 What is necessary is just to be provided along the edge part of the continuous plate main body 11, and to be able to reinforce the notch part 14 for positioning.

  Thus, even if the shape of the bead portion is different from the shape of the bead portions 15 and 17 described above, the portion between the positioning notch portion 14 and the bead portions 15 and 17 of the plate body 11 is the bead portion. 15 and 17 is formed in a convex direction opposite to the convex direction, and when the positioning cutout 14 is engaged with the positioning projection 21, the positioning cutout 14 gets over the positioning projection 21. There is no fear.

  The positioning notch 14 described above is provided with an inclined portion 143 set at a predetermined inclination angle in a continuous portion between the end 111 of the plate body 11 and the arc portion 141 of the positioning notch 14. However, the present invention is not limited to this.

  For example, as shown in FIG. 5B, a continuous portion between the end portion 111 of the plate body 11 and the circular arc portion 141 of the positioning notch portion 14 is rounded in place of the inclined portion 143. Alternatively, the curved portion 144 may be formed.

  Since the positioning notch 14 has the curved portion 144 as described above, when the positioning projection 21 is engaged with the positioning notch 14, the positioning projection 21 is guided more smoothly to the arc portion 141 side. Therefore, the engagement between the positioning protrusion 21 and the positioning notch 14 becomes easier.

  Further, since the shape of the positioning projection 21 is preferably rounded because it leads to a reduction in the possibility of deformation of the printing plate 1, the rounded arc portion 141 is also formed in the positioning notch portion 14. However, it may be formed by forming a rectangular cutout.

  In the above description, the bead portions are formed as the reinforcing portions 15 and 17 of the printing plate 1, but the bent portions 351, 352, and 353 are formed as the reinforcing portions 35 of the printing plate 3. Also good.

  For example, as shown in FIG. 6, the reinforcing portion 35 is formed by bending each edge portion 36 of the positioning cutout portion 34 formed by cutting out into a rectangular shape and folding it on the outer surface side of the plate body 31.

  Specifically, the bent portion 35 is formed as follows. Here, only the parts different from the previous embodiment will be described.

  First, a rectangular notch is formed at a substantially central portion of one longitudinal end portion 311 of the expanded elastic material sheet cut out in a rectangular shape.

  A cut portion 371 is formed by making a cut in each right angle portion 37 of the rectangular cutout so that the edge 36 of the rectangular cutout becomes a free end.

  The cut portion 371 provided in the right angle portion 37 is preferably set so that the position at which the right angle portion 37 is equally divided, that is, the corner portion of the free end after cutting is 135 °.

  Thereafter, the male member 6 made of a substantially square bar-like member is pushed into the rectangular cutout so that the edge 36 of the rectangular cutout is pushed upward from the back surface (inner surface) side of the plate body 31.

  The male member 6 is formed in a quadrangular shape in plan view, and a convex portion 61 having a size substantially equal to the size of each bending position 361 of the rectangular notch is provided at the tip, and the convex portion 61 is rectangular. It is pushed into the notch.

  When the male member 6 is gradually pushed into the rectangular cutout, the edge 36 of the rectangular cutout, which is the free end, is pushed upward and bent at each folding position 361 so that the plate body It spreads in the surface (outer surface) side direction of 31.

  Subsequently, the female member 7 is covered from above with the male member 6 pushed in and protruded from the printing plate 3.

  The female member 7 is a square bar-like member that is slightly larger than the male member 6. The female member 7 has, for example, a concave portion 71 that can be fitted to the convex portion 61 of the male member 6. have.

  The concave portion 71 provided at the tip of the female member 7 is fitted into the convex portion 61 of the male member 6, whereby the edge 36 of the rectangular notch is brought into close contact with the plate body 31 by the male member 6 and the female member 7. By being pressed in this manner, the positioning notch 34 having the bent portions 351, 352, 353 as the reinforcing portion 35 can be obtained.

  As described above, the reinforcing portion 35 is formed with the bent portion 35 formed by bending the edge portion 36 of the positioning cutout portion 34, so that the edge portion 36 of the positioning cutout portion 34 of the plate body 31 is bent. The strength of the positioning notch 34 can be increased.

  Even when the reinforcing portion 35 is a bent portion, the reinforcing portion 35 is not provided as a separate member from the plate main body 31 but is integrally formed with the plate main body 31, so that there is no possibility of the reinforcing portion 35 dropping off. .

  Further, if the bent portion 35 is formed by bending the edge 36 of the positioning notch 34 outward, the inner peripheral surface of the printing plate 3 including the positioning notch 34 is the plate cylinder 2. By being configured to be in contact with the outer peripheral surface, only the positioning notch 34 is changed depending on the thickness of the bent portion as in the case where the edge 36 of the positioning notch 34 is bent inward. Therefore, the printing plate 3 can be smoothly mounted on the plate cylinder 2 without causing the deformation of the printing plate 3 by lifting from the outer peripheral surface of the printing plate 2.

  The bead portions 15 and 17 described above are described as an example having a convex shape with respect to the outer peripheral surface of the plate main body 11, and the plate main body 11 is not affected when the printing plate 1 is mounted on the plate cylinder 2. The outer peripheral surface of the plate body is preferably formed in a convex shape, but a concave bead portion may be provided on the outer peripheral surface of the plate body 11.

  In the above description, when the printing plates 1 and 3 are mounted on the plate cylinder 2, the positioning notches 14 and 34 are described so as to be engaged with the positioning protrusion 21 on the lower side. The arrangement position of the notches 14 and 34 for use is not limited to this.

  The positioning notches 14 and 34 are most preferably provided at positions that are easy to see, for example, on the upper side when inserted into the plate cylinder 2, but at positions other than the joints 13 and 33 of the printing plates 1 and 3. What is necessary is just to be provided.

  In the above description, the printing plates 1 and 3 are described as being formed into a cylindrical shape only by processing using a plate winding machine. However, when the printing plates 1 and 3 are not easily formed into a cylindrical shape, Alternatively, after curling a little in advance, it may be formed into a cylindrical shape by a plate winding machine.

  The positioning notches 14 and 34 described above are described as being capable of positioning in the circumferential direction of the printing plate 1 and in the axial direction of the plate cylinder 2, but are not limited to this, and the end of the plate cylinder 2 is not limited to this. In the case where the stopper 25 is provided, it is sufficient if it is configured so that at least the circumferential positioning of the printing plate 1 can be performed.

  According to the printing plates 1 and 3 as described above, the printing plates 1 and 3 are mounted on the cylindrical plate cylinder 2 and used in a cylindrical shape, and the plate body 11 is made of a metal plate material. , 31 and positioning notches 14, 34 formed at the ends 111, 311 of the plate bodies 11, 31 and formed with notches that can be engaged with the positioning protrusions 21 provided on the plate cylinder 2. And reinforcing portions 15, 17, and 35 that are integrally formed with the plate bodies 11 and 31 and reinforce the positioning notches 14 and 34, and are reinforced by the reinforcing portions 15, 17, and 35 for positioning. The strength of the notches 14 and 34 is increased, and the risk of deformation due to engagement with the positioning projection 21 is reduced.

  Further, the reinforcing portions 15, 17, and 35 are not provided as separate members from the plate main bodies 11, 31, but are integrally formed with the plate main bodies 11, 31, so that the reinforcing portions 15, 17, 35 are dropped off. There is no fear.

  Further, if the above-described reinforcing portions 15, 17, and 35 are applied to a plate for printing a can body in which only one plate portion 12, 32 is provided on the outer peripheral surfaces of the plate bodies 11, 31, positioning is possible. Even if the printing plates 1 and 3 have a small diameter and are easily bent, the strength around the positioning notches 14 and 34 is improved by forming the reinforcing portions 15, 17 and 35. Thus, the positioning projection 21 can be reliably engaged.

  The embodiment described above is merely an example of the present invention, and it is needless to say that the specific configuration and the like can be appropriately changed and designed within the scope of the effects of the present invention.

  The present invention is used as a printing plate for printing a metal can body.

DESCRIPTION OF SYMBOLS 1, 3 ... Printing plate 2 ... Plate cylinder 11, 31 ... Plate main body 12, 32 ... Plate part 14, 34 ... Positioning notch part 14a ... End part (of positioning notch part) 15 ... Reinforcement part (bead part)
16, 36 ... Edge 17 ... Reinforcement part (bead part)
21 ... Positioning projection 35 ... Reinforcing part (bent part)
36 ... Edge 111 ... End of plate body

Claims (3)

A printing plate that is mounted on a cylindrical plate cylinder and used in a cylindrical shape,
A plate body made of a metal plate,
A positioning cutout portion provided at an end of the plate main body and formed with a notch engageable with a positioning projection provided on the plate cylinder;
A reinforcing part that is integrally formed with the plate body and reinforces the positioning notch;
Equipped with a,
The reinforcing part is provided along the periphery of the positioning notch part at a predetermined interval from the end of the positioning notch part, and a convex bead part is formed with respect to the outer peripheral surface of the plate body, and position the printing plate edge from the end of the notch for Me-decided until the bead portion is characterized by comprising projecting inwardly of the plate body. 2. The printing according to claim 1 , wherein the reinforcing portion is formed continuously from the periphery of the positioning notch along an end portion of the plate main body that is continuous with the positioning notch. Edition. 3. The printing plate according to claim 1 , wherein the printing plate is a plate for printing a can body, in which only one plate portion is provided on the outer peripheral surface of the plate body. 4.

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