JP2000157920A - Surface treatment of printing web - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a printing web smoothly glide and also to enable it to have an effective antistatic function by separately applying different functional solvents to the surface and back face of the printed web on the outlet side of a dryer or a cooler of an offset rotary press. SOLUTION: A web 12 is fed to a printing unit 10 though a paper feeder and an infield device, and a prescribed printing is applied to it in printing unit 10, and heat is absorbed from the printed web 12A by passing it though a dryer 14 and winding it on and passing it through a cooling roller 18 of a cooler 16. On the downstream side from the cooler 16, a web surface treating device 20 is arranged, and the printed web 12A is fed to a folding machine 26 through a vertical conveying route formed of guide rollers 22, 24. On both sides of the vertical conveying route, liquid trays 28, 30 are arranged to separately apply different functional solvents to the surface and back face of the printed web 12A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a solvent for adjusting the surface properties of a printed web of an offset rotary press.

[0002]

2. Description of the Related Art Generally, an offset printing apparatus supplies a web from a paper feeder to a printing unit, performs printing, and then performs printing.
It is introduced into a folding machine via a drying device and a cooling device, or cut into sheets by a theta and stacked. Since the printing web is dried by a drying device, a silicon applicator is provided on the outlet side of the cooling device. This is to apply a silicon solution diluted with water to the print web at the position where it exits the cooling device, give the print surface slipperiness, and generate stains and scratches on the print surface inside the guide roller, turn bar, former, and folding machine It is to try to prevent. The main purpose is to protect the ink film, but in order to have the effect of removing static electricity by the humidifying effect, in addition to the water diluent of silicon or a similar product (sliding agent), an antistatic agent is mixed and applied. Often do.

[0003] The application of silicon or the like to the printing web imparts a slippery surface texture to the web, and prevents the rollers, the triangular plate of the former and the turn bar from being stained with ink. In addition, water and an antistatic agent remove static electricity generated by drying and prevent troubles such as folding and sheet cutting.

[0004] In a conventional coating treatment apparatus, a mixture of silicon or a similar product (lubricating agent), water and an antistatic agent is prepared, and a single tank is used for the surface of the silicon applicator.
The structure is such that the roller liquid tray is branched to each of the roller liquid trays for the back surface, and the rollers of the roller liquid tray are rolled into contact with the printing web to transfer the mixed liquid.

[0005]

However, although a mixed solution of a lubricant and an antistatic agent is applied to the front and back surfaces of the web, conventionally, silicon (including similar products) and components of the antistatic agent are mixed depending on the components. Then, there were problems that the anode and the cathode of the ions were canceled or the ph value did not reach the optimum value, and the respective capabilities were reduced. For this reason, ink often adheres to the rollers and the like in the transport path and electrostatic adhesion to the impeller of the folding machine often occurs. There is a problem that it is impossible to secure an effective mounting place.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. A surface treatment of a print web which enables the print web to slide smoothly and has an effective antistatic function. The aim is to provide a method.

[0007]

In order to achieve the above object, a method for treating the surface of a printed web according to the present invention comprises the steps of drying and cooling a printing web at the outlet side of a drying or cooling device of an offset rotary press. , Different functional solvents were separately applied.

More specifically, a lubricant is applied to the front side or the back side of the printing web on the outlet side of the drying device or the cooling device of the offset rotary press, and an antistatic agent is applied to the opposite surface thereof to form the latter. It is characterized in that it is supplied to a web processing device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the method for treating the surface of a printed web according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic configuration diagram of an offset rotary press and a configuration example of a solvent coating device provided on an outlet side of a cooling device of the rotary press. The offset rotary press supplies the web 12 to the printing unit 10 via a paper feeding device and an infeed device. The web 12 is subjected to predetermined printing by the printing unit 10 so that the printing web 12
It is discharged as A, but immediately after printing, it is passed through a drying device 14 to protect the printing surface, and hot-air drying is performed. A cooling device 16 is disposed downstream of the drying device 14, and heats the print web 12A by being wound around and passed through a plurality of built-in cooling rollers 18.
Further, a web surface treatment device 20 according to the embodiment is disposed downstream of the cooling device 16, where the properties of the web surface are adjusted.

FIG. 1B shows a specific configuration of the web surface treatment apparatus 20. The print web 12A supplied from the upstream cooling device 16 follows a vertical transport path formed by a pair of guide rollers 22 and 24 arranged vertically and is fed to the next folding machine 26. I have. Roller liquid trays 28 and 30 are disposed on both sides of the vertical transport path, respectively, so that different functional solvents are separately applied to the front and back surfaces of the print web 12A. Specifically, a lubricant is applied to the front surface of the print web 12A, and an antistatic agent is applied to the rear surface, and the applied antistatic agent is supplied to a folding machine 26 as a subsequent web processing device.

Each of the roller liquid trays 28 and 30 has the same configuration, and is formed so that the roller 34 partially immersed in the liquid layer stored in the liquid tray 32 is rolled and brought into contact with the printing web 12A. The rotation speed of the roller 34 is made variable by a variable speed motor (not shown) so that the application amount can be adjusted. The liquid applied to the front side of the web 12A is a lubricant obtained by diluting silicon with water.
A circulation path is formed between the roller 6 and the surface roller liquid tray 28, and the lubricant is applied to the surface of the printing web 12A by rolling of the roller 34. On the other hand, the liquid applied to the back side of the web 12A is an antistatic agent mainly composed of a surfactant, and forms a circulation path between the antistatic agent tank 38 and the roller liquid tray 30 for the back side. And the antistatic agent is applied to the printing web 12A by the rolling contact of the roller 34.
Is applied to the back surface of

A lubricant and an antistatic agent are separately applied to the front and back surfaces of the printing web 12A by the above-mentioned lubricant liquid tray 28 for the lubricant and the roller dish 30 for the antistatic agent, respectively. The front and back surfaces are subjected to surface treatments having different functions. This printing web 12A is used in the next folding machine 2
Although not shown in detail here, it is folded vertically by a triangular plate, guided to a folding cylinder and parallel folded, and the signature discharged from the folding cylinder is further vertically folded by a chopper device (chopper folding is performed). (There may be no such cases), partly dropped between the blades of the impeller, aligned and flow on the conveyor, and accumulated in the stacker 40.

In such an embodiment, a lubricant is applied to the front surface of the printing web 12A and an antistatic agent is applied to the back surface before the folding machine 26, so that the front surface woven by the folding machine 26 is used. The sliding function between the signatures is ensured, and the signature is effectively prevented from being electrostatically attracted to the blades when the back surface of the web, which is the outer surface of the signature, is loaded into the impeller.

In the above embodiment, the printing web 12 is provided on the output side of the drying device or cooling device of the offset rotary press.
Although the example in which the lubricant is applied to the front surface of A and the antistatic agent is applied to the back surface and supplied to the folding machine 26 as a subsequent web processing apparatus has been described, depending on the folding method of the folding machine 26 or the like, You may comprise so that an antistatic agent may be apply | coated to a front surface and a gliding agent may be apply | coated to a back surface. As the application means, besides using the roller liquid trays 28 and 30, appropriate means such as application using a brush, application using a combination of a roller and a Molton roller, application using a non-woven fabric, nozzle injection, and splashing type using a brush may be used. It goes without saying that you can do it. The solvent contains a humidifier with water.

[0015]

As described above, according to the present invention, different functional solvents such as a lubricating agent and an antistatic agent are separately applied to the front and back surfaces of the printing web at the output side of the drying device or the cooling device of the offset rotary press. , The printed web can be smoothly slid, and an excellent effect of having an effective antistatic function can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a main configuration of an offset rotary press according to an embodiment and a configuration of a solvent coating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Printing unit 12 Web 12A Printing web 14 Drying device 16 Cooling device 18 Cooling roller 20 Web surface treatment device 22, 24 Guide roller 26 Folding machine 28 Roller liquid tray for lubricant 30 Roller liquid tray for antistatic agent 32 Liquid tray 34 Roller 36 lubricant agent tank 38 antistatic agent tank 40 stacker

Claims (2)

[Claims] 1. A method for treating the surface of a printed web, wherein different functional solvents are separately applied to the front and back surfaces of the printed web at the outlet of a drying device or a cooling device of an offset rotary press. 2. Applying a lubricant to the front or back surface of the printing web on the output side of a drying device or a cooling device of an offset rotary press, and applying an antistatic agent to the opposite surface to a web processing device at a subsequent stage. A method for treating the surface of a printed web, comprising supplying the printed web.