JP4848759B2 - Ink smear prevention method for rotary printing press - Google Patents

Description

  The present invention relates to a method for preventing ink smear of a rotary printing press that prevents ink (including varnish, adhesive, etc.) stains near an ink supply device such as a gravure rotary press, and in particular, a plate of a gravure rotary press. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chucking cone that supports a cylinder and an ink smear prevention method for a rotary printing press that prevents ink smear around its axis.

  Conventionally, for example, as shown in the side view of FIG. 4, during printing on a gravure rotary printing press, the ink (32) in the ink pan (30) is immersed in the ink (32) and rotated by the plate cylinder (20). 32) scatters around and adheres to the vicinity of the chucking cone (10) supporting the both ends of the plate cylinder (20) and its shaft portion (12). In the field of soft packaging materials (including adhesives) that use adhesives), it adheres firmly (sticks) and becomes dirty to the extent that it cannot be wiped off with a solvent. Cleaning work to remove the dirt with each replacement was a difficult task.

  In order to avoid the above-described difficult ink stain cleaning operation, for example, as shown in FIG. 4, after both ends of the plate cylinder (20) are fitted and supported by the chucking cone (10), the chuck that is exposed to the outside is displayed. A gum (adhesive) tape (not shown) was wound (applied) so as to cover the surface (10a) of the king corn (10) and the surface (12a) of the shaft portion (12), and the ink was soiled with ink during ink replacement. The gummed tape was peeled off.

  However, the above-mentioned method of sticking the gum tape increases the time and material cost required for sticking the tape, and when the tape is attached, foreign matter is mixed in the ink (32) in the ink pan (30), and the foreign matter becomes a printed matter. There is a concern that pinholes and the like may be adversely affected, and there is also a problem that it takes time (labor) to remove the gummed tape that is soiled with ink during ink replacement.

  On the other hand, as a method for preventing the ink stain, for example, as shown in a side sectional view of FIG. 5, a thermoplastic sheet is applied to a chucking cone (10) of a gravure rotary printing press by vacuum forming or pressure forming. Create a cover (14) with a suitable shape, fit the cover (14) over the entire surface of the chucking cone (10), and remove the cover (14) soiled with this ink when changing ink, There is a method of preventing ink smearing by discarding it (see, for example, Patent Document 1).

The above prior art documents are shown below.
JP-A-5-104697

However, in the technique of covering the conventional chucking cone (10) with a cover (14) formed by molding a thermoplastic sheet by vacuum molding or the like, the cover (14) itself is disposable, so that the cost increases. In addition, although only the chucking cone (10) can be prevented from being soiled, there remains a problem that the shaft (13) connected to the chucking cone (10) cannot be soiled. There is a problem that there is a concern that the plate cylinder (20) is eccentric due to the cover (14) between the cylinder (20) and the chucking cone (10).

  The present invention solves such problems of the prior art, and the problem is to prevent ink (including varnish, adhesive, etc.) stains in the vicinity of an ink supply device such as a gravure rotary printing press. In the method for preventing ink stains of rotary printing presses, the time and material costs for cleaning work do not increase as in the case of the gum tape application method, and there is no risk of contamination, etc. To provide a method for preventing ink stains of a rotary printing press that can prevent not only the chucking cone but also the shaft portion from being soiled and without concern about the eccentricity of the plate cylinder, etc. is there.

In order to achieve the above-mentioned object in the present invention, first, in the invention of claim 1, the chucking cone which is fitted into the fitting holes on both side surfaces of the plate cylinder of the rotary printing press and supports both ends thereof, and is connected thereto. An ink smear prevention method for a rotary printing press that prevents ink smearing of a shaft portion, wherein the outer shape of the chucking cone that is not fitted in the fitting hole of the plate copper is substantially frustoconical cylindrical Is fitted with an easily peelable resin collar having a taper angle matching the chucking cone, and the collar covers from the side surface portion of the copper plate to the shaft portion connected to the chucking cone. This is a method for preventing ink smearing in a rotary printing press.

According to a second aspect of the invention, the collar made of the easily peelable resin is formed by extrusion molding or pressure molding baking method of Teflon (registered trademark) of a fluororesin. This is a method for preventing ink smear of a rotary printing press described in 1.

In the invention of claim 3, the average thickness of the color made of the easily peelable resin is 13 mm to 16 mm. It is.

In the invention of claim 4, the taper angle of the collar inner surface made of the easily peelable resin is 10 °, and the ink smear prevention method for a rotary printing press according to any one of claims 1 to 3. It is what.

The Teflon (registered trademark) referred to in claim 2 is a registered trademark of DuPont of polytetrafluoroethylene (-(CF2 CF2) n-) obtained by polymerization of fluorine-containing olefin, and particularly resistant to chemicals. A fluororesin that is extremely strong, has excellent electrical properties, and is stable at high temperatures.

  Since this invention is the above structure, there exist the following effects.

  That is, according to the first aspect of the invention, it is possible to prevent ink stains on the chucking cones that support both ends of the plate cylinders and the shafts connected thereto that are fitted into the fitting holes on both sides of the plate cylinder of the rotary printing press. In an ink smear prevention method for a rotary printing press, the outer shape is a collar made of an easily peelable resin having a substantially truncated cone shape, and the collar made of the easily peelable resin is fitted so as to cover the chucking cone. Thus, the ink splattering method of the rotary printing press can be used to block ink scattered from the ink supply device (ink pan or the like) with this easily peelable resin color and prevent ink smearing of the chucking cone.

Further, according to the second aspect of the present invention, the fitting of the easily peelable resin collar to the chucking cone is performed from the side end portion that fits into the fitting holes on both side surfaces of the plate cylinder. Even if ink from an ink supply device such as a rotary printing machine is scattered by covering the shaft part, not only the chucking cone but also the ink part of the shaft part connected to it with this easily peelable resin collar A method that does not require much time and materials for the cleaning work as in the conventional method of pasting a gum tape, there is no risk of contamination of foreign matter in the ink, and a conventional plastic molding cover is covered As described above, it is possible to provide a method for preventing ink smearing in a rotary printing press without material costs due to disposable use.

  In addition, when the chucking cone is fitted into the fitting hole of the plate cylinder every time the ink is changed, the fitting hole of the plate cylinder and the chucking cone are formed like a conventional molded cover. Since there is no color made of an easily peelable resin, the ink smear prevention method of a rotary printing press without fear of eccentricity of the plate cylinder can be obtained.

  According to the third aspect of the present invention, the inner surface of the collar made of a substantially frustoconical easily peelable resin has a taper angle suitable for the chucking cone, so that the chucking cone It is possible to provide a method for preventing ink smearing in a rotary printing press that can be easily attached to and detached from the printer and can be fitted so as to fit firmly.

  Furthermore, according to the invention according to claim 4, the easily peelable resin is made of Teflon (registered trademark) of a fluororesin, so that the ink (including an adhesive or the like) in which a molded color is deposited is used. Since the releasability is good, the ink deposited on the color extracted from the chucking cone at the time of ink replacement can be easily peeled off and removed, and it has excellent chemical resistance and solvent resistance, so it is firmly stuck Even when ink is present, the cleaning agent is not affected by the cleaning agent, and therefore, it can be a method for preventing ink smears in a rotary printing press that can be used many times (semi-permanently).

  The easy-release resin is Teflon (registered trademark), a fluororesin, and the number of times of printing is repeated, so even if the inner surface of the plate cylinder is worn or the chucking cone surface is worn, Even if there is a gap between the end face and the Teflon (registered trademark) collar, it will fit so that the gap will be filled by the elasticity, so there is a risk of ink smearing of the chucking cone where ink enters from the gap It is a method without.

  Therefore, the present invention exhibits an excellent practical effect as a method for preventing ink stains in a rotary printing press that prevents ink stains in the vicinity of an ink supply device such as a gravure rotary press.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  In the present invention, for example, a chucking cone (10) for supporting a plate cylinder (20) of a gravure rotary printing press or the like as shown in a side view of FIG. 4 and an ink pan (30) on the surface of its shaft portion (12) are provided. The present invention relates to an ink stain prevention method for preventing the ink (32) from splashing and becoming ink stains.

  The ink smear prevention method of the rotary printing press according to the first aspect of the present invention is, for example, as shown in the side sectional view of FIG. 1 in the fitting hole (22) on the side surface of the plate cylinder (20) of the rotary press. A method for preventing ink smearing in a rotary printing press for preventing ink smearing of a chucking cone (10) that supports both ends of the fitting and a shaft (12) connected thereto, for example, in the perspective view of FIG. As shown in the drawing, an ink smear prevention collar (1) made of an easily peelable resin having a substantially circular truncated conical shape is formed on the surface of the chucking cone (10) as shown in the side sectional view of FIG. 10a) is a method for preventing ink smearing in a rotary printing press that is fitted from a position corresponding to approximately half of the tapered portion.

  Further, the invention according to claim 1 is an ink stain prevention collar (1) made of an easily peelable resin having a substantially truncated cone shape as shown in FIG. When fitting to the chucking cone (10), from the position of the side end (20a) of the chucking cone (10) that fits into the fitting holes (22) on both sides of the plate cylinder (20). This is a method for preventing ink smearing in a rotary printing press that is long enough to cover the shaft (12) connected to the chucking cone (10).

  As shown in FIG. 1, the position corresponding to approximately half of the tapered portion of the chucking cone (10) is fitted into the fitting hole (22) formed on the side surface of the plate cylinder (20). 2 is a position of the side end (20a) of the plate cylinder (20) of the printing cylinder, and as shown in FIG. 2, the rotary printing for fitting the ink stain prevention collar (1) so as to cover from this position to the shaft (12). This is a method for preventing ink stains in the machine.

  Thus, when the chucking cone (10) is fitted into the fitting hole (22) of the plate cylinder (20), the position of the side end surface (20a) of the plate cylinder (20) (chucking cone (10)). By fitting an ink smear prevention collar (10) made of an easily peelable resin so as to cover from the surface (10a) of the taper portion (the position corresponding to approximately half of the taper portion) to the shaft portion (12), the plate cylinder ( 20) Even if ink from an ink supply device (ink pan or the like (not shown)) below the ink splatters, the ink smear prevention collar (1) cuts off the splattered ink and fits into the plate cylinder (20). Ink stain prevention of a rotary printing press that makes it possible to prevent not only the chucking cone (10) but also the shaft portion (12) connected to the chucking cone (10) and the surrounding ink stains. Is the method.

  In the invention according to claim 3, for example, as shown in the perspective view of FIG. 3, the inner surface of the ink stain prevention collar (1) made of an easily peelable resin having a substantially truncated cone shape is formed on the chucking cone. It has a suitable taper angle (α).

  Thus, since the inner surface of the ink smear prevention collar (10) made of an easily peelable resin has a taper angle (α) suitable for the chucking cone (10), as shown in FIG. A fitting that can be easily attached and detached from the tip (10b) of the king cone (10) toward the root and fits firmly (strongly) on the surface (10a) of the chucking corn (10). This is a method for preventing ink stains on a rotary printing press.

  Furthermore, in the present invention, the ink smear prevention collar (1) made of an easily peelable resin is used as a method for preventing ink smear of a rotary printing press made of Teflon (registered trademark) which is a fluorine-based resin.

  The Teflon (registered trademark) is a DuPont fluororesin and has a high heat resistance and chemical resistance (solvent resistance), and has a low friction coefficient and is difficult to adhere to. Therefore, it can be used as a release agent. By using the ink stain prevention collar (1) formed in a substantially truncated cone shape with Teflon (registered trademark) having this easy peelability, the ink stain prevention color extracted from the chucking cone (10) at the time of ink replacement. The ink scattered in (1) can be easily peeled off and removed. Unlike the conventional disposable method in which a cover formed with a thermoplastic plastic sheet is fitted to the chucking cone, it is re-chucked. Can be used by fitting to a king cone.

  In addition, even if there is a strongly sticking ink, it is excellent in chemical resistance (solvent resistance), so it will not be attacked by a cleaning agent that is suitable for cleaning this ink, and thus it will be many times (semi-permanent) ) Can be used repeatedly so that it can be an ink stain preventing color (1).

  Furthermore, for example, as shown in FIG. 1, the ink smear prevention collar (1) fitted to the chucking cone (10) is made of elastic Teflon (registered trademark), so that the number of printings is repeated. Occasionally, the side end surface (20a) of the plate cylinder (20) and the ink stains due to the wear of the inner surface of the fitting hole (22) of the plate cylinder (20) and the surface (10a) of the chucking cone (10). Even if a gap (24) occurs between the prevention collar (1), the gap (24) is fitted so that the gap (24) is filled. This is a method for preventing ink smearing in a rotary printing machine without fear of smearing the surface (10a) of 10).

  Further, the average thickness (D) of the ink stain prevention collar (1) formed in a substantially truncated cone shape shown in FIG. 3 is not particularly limited, but if it is about 13 mm to 16 mm, it prevents ink stains. This is preferable from the standpoint of the strength of the collar (1) itself and the ease of attachment to and removal from the chucking cone (10).

  Further, the taper angle of the chucking cone (10) is generally around 10 °. Therefore, the taper angle (α) of the inner surface of the ink smear prevention collar (1) fitted to the chucking cone (10). Is shaped to conform to this angle.

  In order to obtain a substantially frustoconical cylindrical ink stain preventing collar (1) using the above-mentioned Teflon (registered trademark), it can be molded by an extrusion molding method or a pressure molding baking method. The extrusion molding method and the pressure molding baking method are methods used for molding a thermoplastic plastic, with one exception being a method that can be applied to polytetrafluoroethylene that does not exhibit thermoplasticity.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view illustrating an embodiment of a method for preventing ink stains of a rotary printing press according to the present invention, in which a chucking cone fitted with an ink stain prevention collar is fitted to a plate cylinder. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view illustrating an ink stain prevention method for a rotary printing press according to the present invention, in which an ink stain prevention collar is fitted to a chucking cone. It is a perspective view which shows an example of the ink stain prevention color used for the ink stain prevention method of the rotary printing machine of this invention. It is a side view explaining the printing unit and ink supply apparatus vicinity of a general gravure rotary printing press. It is explanatory drawing which represented the example of the ink stain | pollution | contamination prevention method of the conventional rotary printing machine with the side cross section.

Explanation of symbols

1 ... Ink smear prevention collar 10 ... Chucking cone 10a ... Chucking cone surface 10a ... Chucking cone tip 12 ... Shaft part 12a ... Shaft surface 13 ... Shaft 14 ... Cover 15 ... Frame 20 ... Plate cylinder 20a ... Side edge of plate cylinder 22 ... Fitting hole of plate cylinder 24 ... Gap between side edge of plate cylinder and ink stain prevention collar 30 ... Ink pan 32 ... ... Ink D ... Ink smear prevention collar thickness α ... Ink smudge prevention collar taper angle

Claims (4)

An ink smudge prevention method for a rotary printing press that fits into the fitting holes on both sides of the plate cylinder of the rotary press and prevents ink smearing of the chucking cone that supports both ends and the shaft portion connected to the chucking cone,
The part of the chucking cone that is not fitted in the fitting hole of the plate copper is made of an easily peelable resin having an outer shape of a substantially truncated cone and an inner surface having a taper angle that fits the chucking cone. A method for preventing ink smearing in a rotary printing press , wherein a collar is fitted, and the collar covers from a side surface portion of the printing copper to a shaft portion connected to the chucking cone . 2. The ink stain of a rotary printing press according to claim 1, wherein the collar made of the easily peelable resin is formed by extrusion molding or pressure molding baking method of a fluororesin Teflon (registered trademark). Prevention method. The average thickness of the color made of the easily peelable resin is 13 mm to 16 mm, and the ink smear prevention method for a rotary printing press according to claim 1 or 2 . 4. A method for preventing ink stains in a rotary printing press according to claim 1, wherein the taper angle of the inner surface of the easily peelable resin collar is 10 [deg .].

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