JP2013184398A - Web offset printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a stain or the like from being generated in a printed matter caused by a folding machine of a web offset printing press.SOLUTION: In a web offset printing press, an applicator (8) for a surface smoothing treatment agent is arranged in a route where a web (6) goes out from a dryer to get to the folding machine, and an application roller (9) is provided contactably with the web (6) in an inside of the applicator. The application roller is divided into a plurality of parts along an axial direction of a rotary shaft (9a) thereof, and a divided portion of one or a plurality thereof is arranged to be opposed to a portion to be applied with the surface smoothing treatment agent in the web, as a convex portion (11).

Description

  The present invention relates to an offset rotary printing press provided with a folding machine.

  In printing by a rotary offset printing press, a web (generally paper) is printed through a printing unit of each printing color, and then sent to a drying device for drying ink, and the heated web is cooled by the drying device. Therefore, it is sent to the cooling device, finally goes to the folding machine, is folded by a triangular plate in the folding machine, and is then subjected to various processing such as cutting.

  However, when the web is paper, it is excessively dried by the above-mentioned drying device, and the moisture content tends to decrease and the flexibility tends to be lost. Therefore, when the web reaches the folding machine, the tip of the triangular plate or the inside of the folding machine The web is torn, rubbed and scratched easily.

  If you reduce the speed of the printing machine, it is possible to prevent such problems, but this will reduce productivity, so the triangular plate in the folding machine and other parts of the web that are liable to tear and rub A reduction in the speed of the printing press is avoided by sticking a friction reducing tape to the web to improve the slipping property of the web.

  In addition to using a friction-reducing tape, it is also attempted to increase the slipperiness of the web by applying silicon to the front and back of the web after the web passes through a drying device or the like and before going to the folding machine ( For example, see Patent Document 1). Since the web coated with silicon is reduced in friction when passing through a triangular plate or the like, tearing or the like hardly occurs.

JP 63-262244 A

  In order to prevent web tearing, the method of sticking friction reducing tape to a triangular plate, etc. is sufficient to prevent web tearing depending on the layout of printed pattern on the web, ink coating thickness, paper type, etc. You may not get it. According to the method of applying silicon to the web, there is no disadvantage like the method of sticking the friction reducing tape, but since silicon is applied to the entire front and back of the web by the silicon coater, the consumption of silicon is large. This increases the cost. In particular, in a printing factory having a large number of rotary presses, the consumption is extremely large.

  Accordingly, an object of the present invention is to provide an offset rotary printing press that can solve the above-described problems.

  In order to solve the above problems, the present invention employs the following configuration.

  In addition, although the code | symbol with a parenthesis is attached | subjected in order to make an understanding of this invention easy, this invention is not limited to this.

  That is, in the invention according to claim 1, the applicator (8) of the surface slipping treatment agent (13 a) is disposed in the path from which the web (6) exits the drying device (3) to the folding machine (5). In the offset rotary printing press in which the application roller (9) is provided in the applicator (8) so as to be able to contact the web (6), the application roller (9) is in the axial direction of the rotating shaft (9a). The offset is arranged in such a manner that one or a plurality of divided portions are arranged as a middle-high portion (11) so as to face the portion to which the surface smoothing agent (13a) is applied in the web (6). Adopt a rotary printing press.

  In the invention according to claim 2, the applicator (8) of the surface-smoothing agent (13a) is disposed in the path from which the web (6) exits the drying device (3) to the folding machine (5), In an offset rotary printing machine in which an application roller (9) is provided in the applicator (8) so as to be in contact with the web (6), an excess surface slipping agent (in contact with the application roller (9)). A doctor (12) for removing 13a) is detachably provided so that the doctor (12) faces a place other than the place where the surface smoothing agent (13a) in the web (6) should be applied. Adopt an offset rotary printing press.

  Further, as described in claim 3, in the rotary offset printing press according to claim 1 or 2, the middle-high portion (11) or the area of the pattern printed on the web (6) is used as a reference. The doctor (12) may be disposed.

  As described in claim 4, in the offset rotary printing press according to claim 1 or 2, the middle-high portion (11) according to the processing content of the web (6) in the folding machine (5). Or the said doctor (12) shall be arrange | positioned.

  As described in claim 5, in the rotary offset printing press according to any one of claims 1 to 4, the application roller (9) is driven to slip with respect to the web (6). Can be.

  According to the present invention, there is no drawback as in the method of sticking the friction reducing tape, and the surface slipping agent (13a) does not need to be applied to the entire front and back surfaces of the web (6). )), It is sufficient to apply only to places where printing stains are likely to occur, so the consumption of the surface smoothing agent (13a) is reduced, especially in a printing factory having many rotary presses. The reduction effect is great.

1 is a schematic front view of an offset rotary printing press according to the present invention. It is a front view which shows one Embodiment of the applicator of a surface smoothening processing agent. It is a right view of the part shown in FIG. It is a front view which shows other embodiment of the applicator of a surface smoothening processing agent. It is a right view of the part shown in FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<Embodiment 1>
As shown in FIG. 1, in this rotary offset printing press, a paper feed unit 1, a printing unit 2 of various printing colors, a drying device 3, a cooling device 4, and a folding machine 5 are flow directions of the web 6. Are arranged in a line along.

  The paper feeding unit 1 is loaded with a winding roll 6 a for the web 6, and the web 6 such as paper fed from the winding roll 6 a is printed with a desired pattern by, for example, four printing units 2. The printed web 6 is heated to the drying device 3 so that the ink on the surface is dried, and then the cooling device 4 is cooled to remove the heat applied by the drying device 3. The web 6 cooled by the drying device 3 is directed to the folding machine 5, folded on a line parallel to the traveling direction by the triangular plate 7, and then folded at right angles to the traveling direction by various mechanisms (not shown) in the folding machine 5. Or cut into a signature and discharged out of the folding machine 5.

  Further, as shown in FIG. 1, an applicator 8 for a surface slipping treatment agent is disposed in a travel route where the web 6 exits the cooling device 4 and reaches the folding machine 5. The applicators 8 are disposed so as to face the front and back surfaces of the web 6. When printing is performed only on one side of the web 6, it can be provided only on the corresponding side.

  As the surface lubricity treatment agent, for example, a silicon liquid can be used.

  As shown in FIG.2 and FIG.3, in each applicator 8, the application | coating roller 9 and the container 10 which stores the surface smoothening processing agent 13a are provided. The application roller 9 is arranged so that the rotation shaft 9 a extends in a direction crossing the web 6.

  A portion of the application roller 9 that can contact the web 6 is divided into a plurality of portions in the axial direction of the rotation shaft 9a, and one or a plurality of divided portions are applied to a portion of the web 6 where the surface lubrication agent is to be applied. It arrange | positions so that it may oppose. As shown in FIGS. 2 and 3, in the first embodiment, one divided portion becomes the middle-high portion 11 and is provided so as to face the center line c extending in the running direction of the web 6. The center line c of the web 6 corresponds to a portion that contacts the downward apex portion of the triangular plate 7.

  Each application roller 9 is driven such that the middle-high portion 11, which is a divided portion thereof, slips at the same speed as or against the web 6. By adjusting the driving speed in this way, it is possible to adjust the application amount of the surface slipping treatment agent to the web 6.

  The container 10 extends in a bowl shape below the application roller 9. A liquid surface slipping treatment agent 13 a is stored in the container 10, and the lower side of the middle and high portions 11 of the application roller 9 is submerged in the surface slipping treatment agent 13 a in the container 10. As a result, the surface slipping agent 13a in the container 10 is taken out by the middle and high portions 11 of the rotating application roller 9 and is transferred onto the front and back surfaces of the web 6, respectively. In FIG. 3, the code | symbol 13 shows the coating film of the surface smoothening processing agent transcribe | transferred to the web 6. FIG.

  Next, the operation of the offset rotary printing press will be described.

  The web 6 continuously drawn out from the winding roll 6a is printed with a desired pattern by passing through, for example, four printing units 2. Subsequently, the web 6 enters the drying device 3, is subjected to a drying process for ink of the printed pattern, and is further cooled by the cooling device 4. Subsequently, the surface smoothening treatment agent is applied to the center line c on the front and back of the web 6 by the middle and high portions 11 of the application roller 9 of the applicator 8. Further, the web 6 goes to the folding machine 5 and first enters the folding machine 5 while being folded on the center line c by the triangular plate 7.

  A coating film 13 of the surface smoothing agent is formed on the printed pattern on the surface of the web 6, and the portion covered with the coating film 13 comes into contact with the apex portion of the triangular plate 7. Then, it is introduced into the folding machine 5 without causing printing stains.

  Inside the folder 5, the web 6 is further folded into a predetermined size according to specifications, cut into a signature, and then discharged out of the folder 5.

  The middle and high portions 11 of the application roller 9 can be arranged based on the area ratio of the pattern printed on the web 6. The pattern area ratio can be measured for each column when the front and back surfaces of the web 6 are divided into a plurality of columns in the width direction of the web 6, but the pattern area ratio corresponds to a particularly high width portion of the area ratio found as a result of the measurement. The middle / high portion 11 can be disposed on the application roller 9. Thereby, it is possible to prevent rubbing of printing ink and the like by intensively applying the surface slipping treatment agent to the width portion of the web 6 having a high pattern area ratio.

  Further, it is possible to arrange the middle and high portions 11 according to the processing content of the web 6 in the folding machine 5. In this case, it is possible to prevent rubbing of the printing ink by disposing the middle and high portions 11 at locations corresponding to various folds of the web 6.

<Embodiment 2>
As shown in FIGS. 4 and 5, in the second embodiment, the middle and high portions 11 such as the application roller 9 used in the first embodiment are omitted.

  That is, the application roller 9 in the second embodiment is formed so as to have a uniform diameter over the entire length, and the surface thereof is a straight cylindrical surface. And doctor 12 is provided so that parts other than middle high part 11 of application roller 9 in Embodiment 1 may be touched, and this doctor 12 counters a part other than a part which should apply a surface smoothing processing agent in web 6. To be arranged.

  As a result, the surplus portion of the coating film of the surface lubricity treatment agent adhering to the surface of the application roller 9 is scraped off by the doctor 12, and only a necessary portion is transferred to the web 6. In FIG. 5, the code | symbol 13 shows the coating film of the surface smoothening processing agent transcribe | transferred to the web 6. FIG.

  The doctor 12 is detachably attached to the application roller 9 or the container 10 and can be changed in position according to the change in the application position and application width of the surface smoothing agent, exchanged with other doctors, and added. is there.

  In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In addition, this invention is not limited to the said embodiment, A various change is possible.

DESCRIPTION OF SYMBOLS 3 ... Drying device 5 ... Folding machine 6 ... Web 8 ... Applicator 9 ... Application roller 9a ... Rotating shaft 11 ... Middle high part 12 ... Doctor 13a ... Surface smoothening agent

Claims (5)

  In an offset rotary printing press in which an applicator for a surface-smoothing agent is disposed in a path from the web to the folding machine and the application roller is provided in the applicator so as to come into contact with the web. The coating roller is divided into a plurality of portions in the axial direction of the rotation shaft, and one or a plurality of divided portions are arranged as medium and high portions so as to face the portion where the surface slipping agent on the web is to be applied. An offset rotary printing press characterized by that.   In an offset rotary printing press in which an applicator for a surface-smoothing agent is disposed in a path from the web to the folding machine and the application roller is provided in the applicator so as to come into contact with the web. A doctor that removes excess surface slipping treatment agent in contact with the coating roller is detachably provided so that the doctor faces a portion of the web other than the portion to be coated with the surface slipping treatment agent. An offset rotary printing press characterized by being arranged.   The rotary offset printing press according to claim 1 or 2, wherein the middle-high portion or the doctor is arranged based on an area ratio of a pattern printed on a web.   The offset rotary printing press according to claim 1 or 2, wherein the middle-high portion or the doctor is arranged according to a web processing content in the folding machine.   The offset rotary printing press according to any one of claims 1 to 4, wherein the coating roller is driven to slip with respect to the web.

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