JP2019181806A - Manufacturing method of sleeve plate for laser engraving - Google Patents

Abstract

To provide a manufacturing method of a sleeve plate for laser engraving capable of preventing deformation of a base sleeve by a laser beam even when using the base sleeve having no laser resistance, by replacing a surface material.SOLUTION: A manufacturing method of a sleeve plate for laser engraving formed by winding a rectangular sheet-like surface material on a cylindrical base sleeve, comprises a taper edge formation process of forming an inverse taper part of becoming gradually thin to the surface side from the reverse surface side on the other side edge, by forming a taper part of becoming gradually thin to the reverse surface side from the surface side on mutually opposed one side edges of the surface material and a winding process of winding the surface material on the base sleeve while forming a joint part by overlapping the inverse taper part with the taper part by sticking the taper part to a base sleeve surface by curving the surface material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of manufacturing a sleeve plate for laser engraving.

  Conventionally, in order to print on the surface of a can body such as a beverage can, as described in Patent Document 1, for example, a cylindrical resin printing plate (sleeve printing plate) having a plate engraved on the surface is rotated. However, an apparatus for printing on a cylindrical can body is used.

  A sleeve printing plate used in such a printing apparatus is used for flexographic printing, which is one of letterpress printing methods using liquid ink (water-based ink or UV ink).

  Recently, laser engraving is often employed for forming a plate on the surface of a sleeve printing plate, and a printing relief (printing pattern) can be engraved with high accuracy.

  In particular, the present inventor, who has continued intensive research in this technical field for many years, has focused on the problem of suppressing cracks and chipping during the laser processing of printing plates made of photosensitive resin in the past, and has provided predetermined heating / cooling. A method for producing a sleeve printing plate is provided in which further improvement in printing quality is realized by performing the treatment (see Patent Document 2).

  As described above, printing technology using a sleeve printing plate continues to evolve day by day, and demand is expected to increase further in the future.

JP 2010-162879 A JP, 2015-160370, A

  By the way, the sleeve printing plate described in Patent Document 1 described above cannot replace only the surface material on which the plate is engraved.

  Therefore, it is impossible to renew only the deteriorated surface material, or to divert the base part to other parts except for the surface material, and it is difficult to say that it is economical because the reduction of the manufacturing price is hindered.

  In that respect, the sleeve printing plate described in Patent Document 2 previously proposed by the present inventor is composed of a metal base sleeve and a surface material detachably attached to the base sleeve, and the plate is Since only the engraved surface material can be replaced, it is economically superior.

  Further, when the sleeve printing plate described in Patent Document 1 is composed of a base sleeve and a surface material like the sleeve printing plate described in Patent Document 2, the entire base sleeve is formed of resin such as FRP, and laser When the laser beam during engraving is applied to the base sleeve, the irradiated portion is deformed, for example, by disappearing, and the print quality is significantly affected. In the following description, the resistance of the base sleeve to laser light during laser engraving is simply referred to as laser resistance.

  In this respect, the base sleeve of the sleeve printing plate described in Patent Document 2 is made of metal and has laser resistance, so that burning by laser light can be avoided.

  However, metal base sleeves can often be reused if they are deformed by impact due to dropping, etc., and this is a factor that increases costs, and even base sleeves made of materials that are not laser-resistant prevent deformation. The technology to be done was demanded.

  The present invention has been made in view of such circumstances, and a sleeve for laser engraving capable of changing the surface material and preventing the deformation of the base sleeve by laser light even when a base sleeve having no laser resistance is used. A plate and a manufacturing method thereof are provided.

  In order to solve the above-mentioned conventional problems, in the method of manufacturing a sleeve plate for laser engraving according to the present invention, (1) a sleeve plate for laser engraving formed by winding a rectangular sheet-shaped surface material around a cylindrical base sleeve In the manufacturing method, a taper portion gradually thinning from the front surface side to the back surface side is formed on one edge of the surface material facing each other, and gradually thinning from the back surface side to the surface side on the other edge. A taper edge forming step for forming a reverse taper portion, and bending the surface material, sticking the taper portion to the surface of the base sleeve, and superimposing the reverse taper portion on the taper portion to form a seam portion And a winding step of winding the surface material around the base sleeve.

The method for manufacturing a sleeve plate for laser engraving according to the present invention is also characterized by the following points.
(2) The inclination angle of the reverse taper portion is formed smaller than the inclination angle of the taper portion.
(3) Filling a gap formed between the tapered surface of the tapered portion and the tapered surface of the reverse tapered portion.
(4) The tip of the reverse tapered portion that overlaps beyond the tapered portion is notched so as to be substantially flush with the curved surface of the wound surface material.
(5) The base sleeve is constituted by a sleeve body in which a thermoplastic resin film is curved in a cylindrical shape, and ends are welded to form a joint portion.
(6) The thermoplastic resin film is formed with a tapered portion that gradually becomes thinner from the front side to the back side on one side of the rectangular sheet-like thermoplastic resin film facing each other, and on the other side A reverse taper portion that gradually becomes thinner from the side to the surface side is formed, and the joint portion of the sleeve body is formed by joining the taper surface of the taper portion and the taper surface of the reverse taper portion. .
(7) The base sleeve is composed of a plurality of sleeve bodies that are coaxially stacked in the radial direction by winding another thermoplastic resin film around the surface of the sleeve body formed of one thermoplastic resin film. The joining portion of one sleeve body is formed so as to be laminated with a portion other than the joining portion of another adjacent sleeve body.

  In the laser engraving sleeve plate according to the present invention, (8) a cylindrical base sleeve and a rectangular sheet-like surface material wound around the surface of the base sleeve are substantially the same as the generatrix direction of the base sleeve. A sleeve plate for laser engraving having both ends of the surface material extending along a direction and a surface material layer provided with a seam portion butted without gaps, and the seam portion is one of the both sides The thickness of the surface material layer is a taper portion that is gradually thinned from the front surface side to the back surface side formed on the edge and a reverse taper portion that is gradually thinned from the back surface side to the surface side formed on the other edge. It was assumed that they were abutted by overlapping in the direction.

  According to the method for manufacturing a sleeve plate for laser engraving according to the present invention, a method for manufacturing a sleeve plate for laser engraving, in which a rectangular sheet-like surface material is wound around a cylindrical base sleeve, A taper edge forming step of forming a tapered portion that gradually decreases in thickness from one surface to the back side on one edge facing each other, and a reverse tapered portion that gradually decreases in thickness from the back surface to the surface side on the other edge; Winding the surface material around the base sleeve while curving the surface material, adhering the taper portion on the surface of the base sleeve, and forming the joint portion by superimposing the reverse taper portion on the taper portion Laser engraving that can replace the surface material and prevent deformation of the base sleeve due to laser light even when using a base sleeve that is not laser resistant. Manufacturing method of use sleeve version can be provided.

  The sleeve plate for laser engraving according to the present invention comprises a cylindrical base sleeve and a rectangular sheet-like surface material wound around the surface of the base sleeve, and substantially in the same direction as the generatrix direction of the base sleeve. A sleeve plate for laser engraving having a surface material layer provided with a seam portion where both end sides of the surface material extending along a gap are abutted with or without a gap, wherein the seam portion is one of the both end sides. The thickness direction of the surface material layer includes a taper portion gradually thinning from the front surface side to the back surface side formed on the edge and a reverse taper portion gradually thinning from the back surface side to the surface side formed on the other edge. It is possible to replace the surface material and prevent deformation of the base sleeve due to laser light even when using a base sleeve that is not laser resistant. It is possible to provide a a laser engraving sleeve version.

It is explanatory drawing which showed the structure of the sleeve plate for laser engravings. It is explanatory drawing which shows the state at the time of laser engraving. It is explanatory drawing which shows the state of the joint part of a surface material. It is explanatory drawing which shows the state of the junction part of a base sleeve. It is explanatory drawing which shows the state of the junction part of a base sleeve. It is explanatory drawing which shows the positional relationship of the junction part of a base sleeve, and the joint part of a surface material. It is explanatory drawing which shows the state of the sleeve plate for laser engravings with which the mandrel was mounted | worn. It is explanatory drawing which shows the structure of the conventional sleeve plate for laser engraving.

  The present invention relates to a method for manufacturing a sleeve plate for laser engraving in which a rectangular sheet-shaped surface material is wound around a cylindrical base sleeve, wherein the surface material can be replaced and a base sleeve having no laser resistance is used. Even in such a case, a method of manufacturing a sleeve plate for laser engraving capable of preventing the deformation of the base sleeve by laser light is provided.

  Conventionally, there has been a method of manufacturing a sleeve plate for laser engraving by winding a surface material around a base sleeve, but it is difficult to form a seam between the edges of the wound surface material without a gap. Therefore, as shown in FIG. 8A, the surface 110a of the base sleeve 110 constituting the sleeve plate for laser engraving 100 is exposed at the joint portion 101 through the gap 101a of the surface material 111. .

  Therefore, when laser engraving is performed on the sleeve plate 100 for laser engraving, as shown in FIG. 8B, the laser beam 102a emitted from the laser emitting portion 102 is irradiated to the gap 101a. Then, the surface of the base sleeve 110 is directly exposed, and a part of the base sleeve 110 having no laser resistance is lost and deformed.

  On the other hand, in the manufacturing method of the sleeve plate for laser engraving according to the present embodiment, the edge of the surface material has a predetermined shape, and the joint portion has a unique structure that has not been obtained so far. To solve the problem.

  In the method of manufacturing a sleeve plate for laser engraving according to the present embodiment, the material of the base sleeve is not limited, but a material that is not laser-resistant, that is, a part of the material when irradiated with laser light during laser engraving. Effective when used as a material that may be lost and deformed.

  In particular, in the present application, since this base sleeve is also a characteristic part as a selective aspect of this manufacturing method, a detailed configuration of the base sleeve will be described later.

  The surface material attached to the base sleeve is not particularly limited as long as it is a material that can be laser processed and is suitable for printing. For example, the surface of the support made of PET film or fiber is photosensitive. What formed by overlapping elastic body layers, such as resin and an elastomer, can be used conveniently.

  And as a feature point of the manufacturing method of the sleeve plate for laser engraving according to the present embodiment, the sleeve plate for laser engraving is manufactured through a taper edge forming step and a winding step.

  In the taper edge forming step, a taper portion gradually thinning from the surface side to the back surface side is formed on one edge of the surface material facing each other, and a reverse taper is formed on the other edge gradually thinning from the back surface side to the surface side. It is the process of forming a part.

  FIG. 1 is an explanatory view showing a base sleeve 10 and a surface material 11 according to the method for manufacturing a laser engraving sleeve plate according to the present embodiment, and FIG. 1A shows a laser engraving sleeve plate A as a base sleeve 10. And a surface material 11 wound around the surface of the base sleeve 10.

  As shown in FIG. 1A, the base sleeve 10 is a cylindrical member having a length around the outer surface L1, and a sleeve plate A for laser engraving is wound by winding a surface material 11 in the circumferential direction. Is configured.

  The surface material 11 is a sheet body having a rectangular shape in front view including a front surface 11a engraved by a laser engraving machine and a back surface 11b wound around the surface of the base sleeve 10.

  Further, taper edges 12 are formed at both ends of the base sleeve 10 facing each other in the bending direction P, that is, at the edges of both ends of the surface material 11 extending along the same direction as the generatrix direction of the base sleeve. Yes. FIG. 1B is a sectional view in the thickness direction of the surface material 11 schematically showing the configuration of the tapered edge 12. In this embodiment, as shown in FIG. 1B, a resin layer 13a that is laser engraved from the front surface 11a to the back surface 11b, a support layer 13b that supports the resin layer 13a, and the surface material 11 are used as a base. Although the surface material 11 which has a multilayer structure with the adhesion layer 13c for making it stick on the surface of the sleeve 10 is shown as an example, it is not limited to this. For example, it is possible to use a double-sided tape separately as an alternative to the adhesive layer 13c when the surface material 11 composed of the resin layer 13a and the support layer 13b is used and wound around the base sleeve 10.

  As shown on the left side in FIG. 1B, the tapered edge 12 includes a tapered portion 12a formed so as to gradually become thinner from the front surface 11a side to the back surface 11b side at one edge, and FIG. ) And a reverse taper portion 12b formed so as to gradually become thinner from the back surface 11b side to the front surface 11a side at the other edge shown on the right side. In the present embodiment, the taper width indicated by reference numeral L4 is approximately 1.7 to 2.3 mm, and the reverse taper width indicated by reference numeral L5 is approximately 1.9 to 2.5 mm. In the following description, the length in the bending direction P of a portion where neither the tapered portion 12a nor the reverse tapered portion 12b is formed (hereinafter also referred to as a surface material body portion) is referred to as a surface material body portion length L3. The length of the front surface 11a in the bending direction P, that is, the length of the surface material main body portion length L3 and the reverse taper width L5 is referred to as the surface length L6, and the length of the back surface 11b in the bending direction P, that is, The length obtained by combining the surface material body length L3 and the taper width L4 is referred to as a back surface length L7.

  When the surface material 11 is cut out from the long surface material wound in a roll shape, these taper edges 12 are cut by being inclined with respect to the cutting target portion of the long surface material in a curved direction rather than the normal direction. It is also possible to form by cutting along the normal direction so that the end face is substantially perpendicular, and then cutting the corner indicated by the broken line in FIG. It is.

  Further, the inclination angle α of the taper portion 12a and the inclination angle β of the inverse taper portion 12b are not particularly limited as long as they are acute angles, but are preferably in the range of 10 degrees to 60 degrees, and more preferably 30 degrees ± 10 degrees.

  Further, the inclination angle α of the taper portion 12a and the inclination angle β of the inverse taper portion 12b may be formed at substantially the same angle, and the inclination angle β may be formed at an angle smaller than the inclination angle α.

  Further, the length in the bending direction P when wound around the base sleeve 10, that is, the length indicated by the symbol L <b> 2 in FIG. 1A (hereinafter also referred to as the bending length L <b> 2) is the surface material 11. Depending on the thickness, when the surface material 11 is wound around the base sleeve 10, the length that the taper surface of the taper portion 12a and the taper surface of the reverse taper portion 12b contact each other without any gap is ideal.

  However, when the length of the curved length L2 is a length where both tapered surfaces are tightly abutted, the bonding cannot be performed well and peeling occurs. Therefore, the curved length L2 of the surface material 11 is set to the base sleeve 10. Is slightly shorter than the outer peripheral length L1 so that a slight gap (for example, about 0.1 to 0.3 mm) is formed between both tapered surfaces, or the back surface length L7 of the surface material 11 is slightly gapd. The length of the surface material 11 is set to the surface length L6 of the reverse taper portion 12b and the taper portion 12a is slightly less than the outer length L1 of the base sleeve 10 (for example, a length shorter than the outer peripheral length L1 of the base sleeve 10). It is good also as a length (for example, length exceeding the taper part 12a about 0.05-0.3 mm) superposed on a surface material main-body part. However, when the length is such that a gap is formed between both tapered surfaces, the surface of the base sleeve 10 corresponding to the gap portion where the surface material 11 is not adhered is thicker than the relief depth at the time of laser engraving. Should be covered with the surface material 11.

  In the winding process, the taper portion 12a is adhered to the surface of the base sleeve 10, and the surface material 11 is rounded along the curved surface of the base sleeve 10 while the reverse taper portion 12b is superimposed on the taper portion 12a. In this step, the surface material 11 is wound to form the surface material layer 14. Here, the term “overlapping” means that the taper portion 12a and the reverse taper portion 12b are overlapped in the stacking direction regardless of whether both tapered surfaces are in contact with each other or whether a gap is formed. Means state.

  The direction of the surface material 11 when the surface material 11 is wound around the base sleeve 10 is not particularly limited, but the taper portion 12a tapers along the rotation direction R of the base sleeve 10 during printing. It is desirable that the surface be inclined downward. In addition, it is desirable that the direction of the tip of the reverse tapered portion 12b is opposite to the rotation direction during printing.

  For example, when the winding step is performed while the inclination angle α and the inclination angle β are substantially the same angle, the surface material 11 is wound around the surface of the base sleeve 10 as shown in FIG. The joint portion 15 of the surface material layer 14 has a taper portion 12a and a reverse taper portion 12b that overlap each other in the thickness direction of the surface material layer 14 by appropriately adjusting the length of the curved length L2. The taper surfaces of the portions will abut against each other in contact.

  Therefore, the laser engraving sleeve plate A having such a seam structure is not formed with a gap in which the surface of the base sleeve 10 is exposed in the seam 15, and when laser engraving is performed, FIG. ), The base sleeve 10 is not directly irradiated with the laser beam 102a, and even the base sleeve 10 made of a material having no laser resistance can prevent deformation due to disappearance. Can do.

  Further, even if a slight gap 15a is formed in the joint portion 15 as shown in FIG. 3A, the tapered surfaces of the tapered portion 12a and the reverse tapered portion 12b are made to be in the direction of the optical axis of the laser beam 102a. Since it is formed in the transverse direction, the laser beam 102a is not directly applied to the surface of the base sleeve 10, and deformation due to disappearance is prevented.

  Further, as shown in FIG. 3B, such a gap may be filled with a filler 15b to form a filling portion 15c. As the filler 15b, for example, an unexposed material of a photosensitive resin plate can be used, and heat-softened or softened with a solvent may be pressed into the joint gap and then cured with ultraviolet light. Further, as the filler 15b, an adhesive such as rubber, silicon or cyanoacrylate can be used.

  After filling the gap 15b with the filler 15b, the hardened portion 15d of the filler 15b overflowing from the surface opening of the gap 15a is cut with, for example, a milling blade, and as shown in FIG. It is desirable to perform post-processing so as to be substantially flush with the curved surface or flattened.

  Further, assuming that a gap is formed in advance, the inclination angle β of the reverse taper portion 12b of the surface material 11 shown in FIG. 1B is formed at an angle smaller than the inclination angle α of the taper portion 12a, and the surface The front surface length L6 of the surface material 11 and the reverse taper width L5 are overlapped with the tip of the reverse taper portion 12b slightly beyond the taper portion 12a while the back surface length L7 of the material 11 is set to a length that allows a slight gap. It may be a length.

  In this case, as shown in FIG. 4A, a protruding tip portion 12c is formed in which the tip of the reverse tapered portion 12b slightly protrudes from the surface of the surface material layer 14 onto the surface material main body portion beyond the tapered portion 12a. However, this projecting portion is cut out to be substantially flush with the curved surface of the surface material layer 14 to form a cutout portion 12d as shown by a broken line, so that the laser beam 102a directly applied to the surface of the base sleeve 10 can be obtained. Irradiation can be more reliably suppressed.

  As described above, the method for manufacturing the base sleeve for laser engraving according to the present embodiment manufactures a sleeve plate for laser engraving that can prevent the deformation of the base sleeve due to laser light and that can replace the surface material. Can do. In addition, it is a user's appropriate to make further changes to the sleeve plate for laser engraving manufactured by this manufacturing method to make it impossible to replace the surface material. Needless to say, it is also included in the present invention. However, it does not preclude the applicant from limiting these specifications when the rights of the present application are granted.

  That is, both end sides of the surface material, which is formed of a cylindrical base sleeve and a surface material in the form of a rectangular sheet wound around the surface of the base sleeve, are extended along substantially the same direction as the generatrix direction of the base sleeve. (Including a case where a gap is formed) and a surface material layer having a seam portion, wherein the seam portion is a surface side formed on one edge of the both end sides Laser engraving in which a taper portion gradually thinning from the back surface to the back surface and a reverse taper portion gradually thinning from the back surface to the front surface formed on the other edge are overlapped in the thickness direction of the surface material layer A sleeve plate and a manufacturing method thereof can be provided.

  Further, as described above, the method for manufacturing the base sleeve for laser engraving according to the present embodiment can be applied regardless of whether the base sleeve 10 has laser resistance or not. It is also an idea to process and form the material.

  That is, the base sleeve 10 may be configured by a sleeve body in which a thermoplastic resin film is curved in a cylindrical shape and the ends are welded to form a joint portion.

  In the past, the present inventor has also proposed a technique for reusing a sleeve by replacing the surface material by adopting a metal base sleeve, but this is exclusively applied to the seam portion in the conventional surface material pasting method. This is because the gap is formed and the base sleeve is exposed from the gap, and therefore the laser engraving sleeve plate A is required not to be destroyed by the laser.

  However, the metal base sleeve is deformed by an impact caused by dropping or the like and often cannot be reused, resulting in an increase in cost. On the other hand, the base sleeve made of plastic film is less likely to be damaged when dropped, and is lightweight and inexpensive.

  Among the existing sleeve plates for laser engraving, for sleeve plates manufactured by winding a liquid photosensitive resin around an FRP sleeve, exposing it to ultraviolet light, solidifying it, and cylindrical grinding, the entire surface of the base sleeve Because it is covered with resin, laser engraving is possible without damaging the base sleeve, but when manufacturing the base sleeve, there are many man-hours for manufacturing with FRP, and it is necessary to mold thickly when winding liquid resin The photosensitive resin was expensive due to poor yield and time and labor for cylindrical grinding.

  Therefore, in the method of manufacturing a sleeve plate for laser engraving according to the present embodiment, an inexpensive thermoplastic resin film is rolled into a cylindrical shape to form a sleeve body, and a base sleeve is constructed from this sleeve body.

  As the thermoplastic resin film used for forming the sleeve body, a thermoplastic resin having high strength, for example, a polyester film or a polycarbonate film can be used.

  For example, when a polyester film is selected, a biaxially stretched film is preferable in terms of strength, and a highly crystalline film should be selected. A film in which short fibers such as glass fiber, Kevlar fiber, and carbon fiber are kneaded as a filler may be used. In the case of a biaxially stretched film, a direction with a high elongation at break should be selected in the circumferential direction of the sleeve, and it is generally desirable to use the MD direction of stretching.

  Moreover, joining of the bending direction edge sides of a thermoplastic resin film can be performed by ultrasonic welding, for example.

  By providing such a configuration, the base sleeve portion can be manufactured inexpensively and easily, and can be easily disposed of by incineration as a flammable material when it is no longer needed. Is done.

  The length of the thermoplastic resin film used in the construction of the sleeve body (base sleeve) in the bending direction is such that the inner circumference of the base sleeve that is finally constructed is longer than the outer circumference of the mandrel used for printing and engraving. The length is preferably as short as 0.1% to 0.3%. With such a configuration, the mandrel is always fastened with a constant strong contraction force, and the laser engraving sleeve plate can be prevented from floating or slipping from the mandrel surface due to centrifugal force even during high-speed rotation.

  Further, in the production of the sleeve body (base sleeve), a tapered portion that gradually becomes thinner from the front surface side to the back surface side is formed on one side edge of the rectangular sheet-like thermoplastic resin film, and the other side edge is formed. And forming a reverse taper portion that gradually becomes thinner from the back surface side to the front surface side, and joining the taper surface of the taper portion 22a of the sleeve body 20 and the taper surface of the reverse taper portion 22b as shown in FIG. 25 may be formed.

  That is, when the base sleeve 10 formed of the sleeve body 20 is formed by rounding a thermoplastic resin film into a cylindrical shape and joining the edges, the structure of the joint portion 25 is the structure of the joint portion 15 of the surface material 11 described above. And may be formed in substantially the same manner. By adopting such a configuration, even if a mandrel slightly thicker than the sleeve diameter used for laser engraving or printing is inserted or removed, it does not break.

  Moreover, it is preferable that the taper surface of the taper part 22a of the sleeve body 20 or the reverse taper part 22b has one or both of the surface roughnesses of about Ra10-50. By setting it as such a structure, the joining at the time of welding can be strengthened further.

  The overlapping width of the tapered portion 22a and the reverse tapered portion 22b in the joint portion 25 is preferably in the range of approximately 1 mm to 6 mm, although it depends on the thickness of the thermoplastic resin film to be used.

  When the sleeve plate A for laser engraving is constructed, the joint portion 15 of the surface material 11 wound around the base sleeve 10 is positioned on the circumference and the position of the joint portion 25 of the sleeve body as shown in FIG. It is desirable to add a phase difference. By adopting such a configuration, the surface material body portion of the surface material 11, that is, the portion other than the joint portion 15 is affixed to the joint portion 25 of the base sleeve 10 (sleeve body 20). Since the seam portion 15 is affixed to the main body portion of the thermoplastic resin film constituting the base sleeve 10 (sleeve body 20), that is, the portion other than the joining portion 25, the sleeve plate A for laser engraving has a stronger structure. It can be.

  The base sleeve 10 is constituted by a plurality of sleeve bodies 20 stacked in the radial direction by winding another thermoplastic resin film around the surface of the sleeve body 20 formed of one thermoplastic resin film. Also good.

  By setting it as such a structure, it can be set as the base sleeve 10 with higher intensity | strength.

  When constructing the base sleeve 10 in which a plurality of sleeve bodies 20 are laminated, these can be bonded with a double-sided tape or an adhesive. For example, when the thermoplastic resin film to be used has a black grade, the interface between the films can be surface-welded with a YAG laser or the like.

  Moreover, it is preferable that the joint portion 25 of one sleeve body 20 is laminated with a portion other than the joint portion 25 of another adjacent sleeve body 20.

  The joint portion 25 of each sleeve body 20 is a fragile portion that may be broken by a tension in the circumferential direction generated by rotation when mounted on a mandrel as a sleeve printing plate. The possibility of breakage can be reduced by making the phases of the joining portions 25 of the adjacent sleeve bodies 20 different in the circumferential direction. This is because the joint portion 25 of the one sleeve body 20 can be reinforced by joining the joint portion 25 of the one sleeve body 20 to a portion other than the joint portion 25 of the other sleeve body 20.

  The sleeve plate A for laser engraving is formed with a notch that engages a register pin formed on the mandrel, and a notch reinforcing plate that reinforces the periphery of the notch between the base sleeve 10 and the surface material 11. You may make it interpose.

  That is, as shown in FIG. 7A, a convex register pin 31 is formed on the peripheral surface of the mandrel 30, and the notch 32 formed on the sleeve plate is formed on the register pin 31 when performing laser engraving or printing. By engaging, the pattern on the surface of the sleeve plate and the phase in the circumferential direction of the mandrel 30 are matched, but in this embodiment, in order to reinforce the periphery of the notch 32, the base sleeve 10 and the surface material 11, a notch reinforcing plate 33 is interposed.

  As shown in FIG. 7B, the notch reinforcing plate 33 is a substantially semicircular metal plate, and a register pin engaging portion 33a in which a substantially central portion of a side corresponding to a string is cut out in the shape of a notch 32 is provided. Is formed.

  In addition, the corner from the side corresponding to the chord to the register pin engaging portion 33a and the corner from the side corresponding to the chord to the side corresponding to the arc are cut out or formed into an R shape, respectively. Further, the laser engraving sleeve plate A is prevented from being broken due to the notch reinforcing plate 33.

  In addition, as an example of the attachment mode of the notch reinforcing plate 33, for example, when the thickness of the base sleeve 10 is 0.3 mm and the thickness of the surface material 11 is 1 mm including the double-sided tape, the support layer 13b of the surface material 11 is used. This can be realized by setting a 0.1 mm deep countersink on the back surface of the polyester film and fitting a notch reinforcing plate 33 made of stainless steel having a thickness of 0.1 mm. As another example, when the thickness of the base sleeve 10 is 0.5 mm, the thickness of the double-sided tape is 0.5 mm, and the thickness of the surface material 11 is 1.7 mm, the double-sided tape at the location of the notch 32 is notched and thin for pasting. You may implement | achieve by inserting the notch reinforcement board 33 which becomes 0.5 mm thickness including a double-sided tape.

  As yet another example, after the members are stacked and bonded together, a notch shape may be added by a punch and a die that cut through the notch shape.

  In this way, the base sleeve 10 is formed of a thermoplastic resin film having a joint portion which is curved in a cylindrical shape and whose opposite ends are welded to each other, or the joint portion is formed on one edge of the both end sides. A taper portion that is gradually thinned from the front surface side to the back surface side and a reverse taper portion that is gradually thinned from the back surface side to the surface side formed on the other edge are superimposed in the thickness direction of the surface material layer. And a method for manufacturing the sleeve plate for laser engraving which are brought into contact with each other.

  Hereinafter, the manufacturing method of the sleeve plate for laser engraving according to the present embodiment will be further described with reference to an actual manufacturing example.

[1. Formation of base sleeve)
In order to form the base sleeve, a 200 mm wide and 712.7 mm long rectangle was cut out using a Lumirror (polyester film) manufactured by Toray Industries, Inc. and a 300 micron thick film of H10 grade as a thermoplastic resin film. The length in the bending direction was 712.7 mm, and the direction was the MD direction of the film.

  The taper part and the reverse taper part with a surface roughness of about Ra10 to 50 are polished by polishing with a belt sander using an aluminum plate with a tip section angle of 6 ° cut as a guide at both ends in the bending direction. Formed. As an indication of the polishing width, the film was colored with magic at both ends of the film at a width of 3 mm.

  Polishing was completed based on the degree to which the colored portion could not be visually confirmed by polishing.

  This is wound around an iron mandrel with an outer diameter of 225.86 mm, and a sheet magnet is wound around and fixed to the outer periphery other than the joint, and then the overlapping part of the end of the film is placed on an ultrasonic welding machine manufactured by Seidensha Electronics Industry And welded. The welder was a 3 mm wide and 200 mm long tip with a flat shape.

  The overlapped part was welded almost well, but the broken part was seen at the tip of the film during polishing, so the broken part was filled with cyanoacrylate adhesive and flattened with sandpaper after solidification Polishing was performed to form a base sleeve made of a single-layer sleeve body.

[2. Formation of surface material layer
Printed J-printed J-grade 0.95mm thick product made of Toyobo Co., Ltd. was UV-cured on the created polyester film base sleeve and subjected to water washing heat treatment, etc., with double-coated tape 0.06mm thick product made by Nitto Denko Corporation Pasted and wound. The circumferential phase of the joint portion of the base sleeve and the joint portion of the surface material was shifted by 180 °. In addition, the water washing heat treatment includes a step of cooling with water after exposure to ultraviolet light, a step of cooling with water, a step of performing heat treatment with hot air in an oven at a temperature of 135 ° C. to 170 ° C., and a step after the heat treatment. You may make it perform through the process of naturally cooling the said printing plate. Further, the heat treatment and the heat radiation treatment may be performed while being held in a cylindrical shape with substantially the same diameter as that wound around the base sleeve.

  The taper shape at both ends of the surface material is such that the upper taper (reverse taper portion) on the top of the stack is more acute and the length is adjusted so that the tip slightly protrudes from the taper portion. The notch was formed by grinding.

[3. Notch formation)
This sleeve plate was mounted on a mandrel having an outer diameter of φ226.17 mm, and the length in the surface length direction was cut to 188 mm with a laser engraving machine manufactured by ESCOGRAPHY, and a notch-shaped engraving was also performed. The phase difference between the circumferential position of the notch and the position of the surface material joint was 10 °.

[4. (Sculpture)
The laser engraving sleeve plate thus prepared was engraved with 1 set of 8 images by laser engraving.

  After engraving, the engraving debris was washed with 0.5% lactic acid water and dried to obtain a printing sleeve plate.

[5. printing〕
Using this printing sleeve plate, printing was performed with a Concorde decorator manufactured by Stole Machinery. The mandrel diameter of the printing press was φ226.2mm.

  The printing results were generally good, and no printing misalignment could be confirmed even at a maximum printing speed of 2000 cpm.

  In the FRP sleeve plate, printing deviation was confirmed when it exceeded 1500 cpm, and it was proved that the sleeve plate according to the present invention has higher position holding performance even at high rotation.

[6. Drop test)
After the printing test, a drop test of the sleeve plate was performed. It was dropped onto a concrete floor from a height of 1.5 m and dropped 20 times per plate. A drop test was performed on all 8 plates, but no sleeve was found to be damaged. Under the same conditions, most nickel sleeves were distorted.

  As described above, according to the method for manufacturing a laser engraving sleeve plate according to this embodiment, a method for manufacturing a laser engraving sleeve plate in which a rectangular sheet-shaped surface material is wound around a cylindrical base sleeve. A taper portion gradually thinning from the front surface side to the back surface side is formed on one edge of the surface material facing each other, and a reverse taper portion gradually thinning from the back surface side to the surface side is formed on the other edge. Forming a taper edge; curving the surface material; adhering the taper portion to the surface of the base sleeve; and superimposing the reverse taper portion on the taper portion to form a seam portion; A winding process for winding the material, so that the surface material can be replaced, and even when a base sleeve that does not have laser resistance is used, the base sleeve can be changed by laser light. Method for producing a laser engraving sleeve plate capable of preventing the can be provided.

  Also, if the base sleeve is composed of a sleeve body in which a thermoplastic resin film is bent into a cylindrical shape and the edges are welded to form a joint, it is lightweight and inexpensive, has high drop resistance, and is easily discarded. It is possible to provide a method for manufacturing a sleeve plate for laser engraving that can be performed.

  Finally, the description of each embodiment described above is an example of the present invention, and the present invention is not limited to the above-described embodiment. For this reason, it is a matter of course that various modifications can be made in accordance with the design and the like as long as they do not depart from the technical idea according to the present invention other than the embodiments described above.

DESCRIPTION OF SYMBOLS 10 Base sleeve 11 Surface material 11a Surface 11b Back surface 12 Tapered edge 12a Tapered part 12b Reverse taper part 12c Projection front-end | tip part 12d Notch part 14 Surface material layer 15 Seam part 15a Gap 15b Filler 20 Sleeve body 22a Taper part 22b Reverse taper part 25 Joint α Inclination angle β Inclination angle A Sleeve plate for laser engraving P Curve direction

Claims (8)

A method of manufacturing a sleeve plate for laser engraving, in which a rectangular sheet-shaped surface material is wound around a cylindrical base sleeve,
A taper that forms a taper portion that gradually decreases from the front surface side to the back surface side on one edge of the surface material facing each other, and that forms an inverse taper portion that gradually decreases from the back surface side to the surface side on the other edge. An edge forming process;
A winding step in which the surface material is curved, the taper portion is attached to the surface of the base sleeve, and the surface material is wound around the base sleeve while forming the joint portion by superimposing the reverse taper portion on the taper portion. When,
A method for producing a sleeve plate for laser engraving, comprising:   2. The method for manufacturing a sleeve plate for laser engraving according to claim 1, wherein an inclination angle of the reverse taper portion is smaller than an inclination angle of the taper portion.   3. The sleeve plate for laser engraving according to claim 1, wherein a filler is filled in a gap formed between a tapered surface of the tapered portion and a tapered surface of the reverse tapered portion. Manufacturing method.   The laser engraving according to any one of claims 1 to 3, wherein a tip of the reverse tapered portion that overlaps beyond the tapered portion is cut out substantially flush with a curved surface of the wound surface material. Of manufacturing a sleeve plate.   The laser according to any one of claims 1 to 4, wherein the base sleeve is constituted by a sleeve body in which a thermoplastic resin film is curved in a cylindrical shape and the edges are welded to form a joint portion. A method for producing a sleeve plate for engraving. The thermoplastic resin film has a taper portion that gradually becomes thinner from one surface to the other side of the rectangular sheet-like thermoplastic resin film facing each other, and the other edge is a surface from the back side. A reverse taper part that gradually becomes thinner to the side is formed.
6. The method of manufacturing a sleeve plate for laser engraving according to claim 5, wherein the joining portion of the sleeve body is formed by joining a tapered surface of the tapered portion and a tapered surface of the reverse tapered portion. The base sleeve is composed of a plurality of sleeve bodies that are coaxially laminated in the radial direction by winding another thermoplastic resin film around the surface of the sleeve body formed of one thermoplastic resin film,
7. The method for manufacturing a sleeve plate for laser engraving according to claim 5, wherein the joining portion of one sleeve body is formed so as to be laminated with a portion other than the joining portion of another adjacent sleeve body. . A cylindrical base sleeve and a rectangular sheet-like surface material wound around the surface of the base sleeve and extending along substantially the same direction as the generatrix direction of the base sleeve have no gaps or gaps. In a sleeve plate for laser engraving having a surface material layer having a seam portion abutted through,
The seam portion is a tapered portion formed on one edge of the both end sides and gradually thinned from the surface side to the back surface side, and a reverse portion formed on the other edge and gradually thinned from the back surface side to the surface side. A sleeve plate for laser engraving, wherein a taper portion is abutted so as to overlap in the thickness direction of the surface material layer.

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