JPH0447943A - Varnish coating device for printed matter - Google Patents

Abstract

PURPOSE:To adjust and stick a predetermined quantity of varnish all the time without making a varnish on a source roller zero by abutting a rider roller against a destination roller arranged between the source roller and a coater cylinder and providing a varnish removing device in which a tip of a blade is abutted against the rider roller. CONSTITUTION:Rollers 2, 3, 6, 7, 8, and 21 are abutted on each other and a pump 15 is started. When a printed paper 9 is moved, a varnish 4 in a varnish vessel 5 stirred by a stirrer 25 being heated by a heater 20 is pulled up by a rotating source roller 6 so as to become a varnish membrane. the membrane sticks to tht surface of the roller 6 and is transferred to a quantity adjusting roller 7 so as to be adjusted. This varnish membrane is transferred to a destination roller 8, and thereafter, transferred to a coater cylinder 3 so as to be coated on a printing surface of the paper 9 which passes between the coater cylinder 3 and an impression cylinder 2. In such a varnish coating operation, the varnish on the destination roller 8 is transferred to a rider roller 21 circumscribed thereto and scraped by a blade 23 and discharged to a container 22. Thus, an adjustment of the quantity of the varnish will be comparatively easy and varnish coating on a printed matter willbe done uniformly, improving the quality of the printed matter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a varnish coating device for printed matter that applies varnish to a paper surface after printing.

[Conventional technology]

Varnish coating, which applies water-based varnish to the paper surface after printing to prevent staining of the printed surface during stacking of discharged paper and to add gloss to the paper surface, is used for applications that require beauty, such as book covers, catalogs, and pamphlets. This is mainly carried out on printed matter.

Traditionally, varnish coating equipment that performs this type of varnishing is
It is installed between the printing unit and the paper discharge device of a sheet-fed rotary printing press, or it is installed independently, and among these, the structure of the varnish coating device installed inside the printing press is, for example, The one disclosed in No.-272455 is known. This device consists of a source roller that rotates in a varnish boat that stores varnish, a coater cylinder that has a blanket wrapped around its circumferential surface, and a peripheral surface that is arranged between the source roller and the coater cylinder so that their circumferential surfaces are in contact with each other. The blanket surface of the coater cylinder is in contact with the peripheral surface of the impression cylinder. Further, a varnishing roller is located above the varnishing boat and is in contact with the original roller. A varnish scraping blade is placed in contact with the circumferential surface of the roller over the entire length of the roller, and this blade is provided with a scraping boat that opens above the varnish boat. Further, a varnish tank immersed in hot water in a tank and a varnish circulation pump are connected to the varnish boat by piping.

With this configuration, when each roller rotates, the varnish that is pulled up from inside the varnishing boat by the original roller and adhered to the peripheral surface of the original roller is leveled by the varnish cutting roller, and then transferred to the coater cylinder by the deposition roller. The varnish is applied to the printing surface of the paper that is held in the claws of the impression cylinder and is conveyed by passing between the coater cylinder and the impression cylinder as the impression cylinder rotates. When applying varnish, the varnish that remains on the coating roller as a result of being transferred from the coating roller to the coater barrel is scraped off by a blade, returned to the varnishing boat via the scraping boat, and heated with hot water in the tank. The varnish and the varnish returned to the varnish boat are circulated between the varnish boat and the tank by a pump. The paper coated with varnish is held in the claws of the paper delivery chain, and while it is transported, the varnished surface is dried in a drying device, and at the end of the transport, it is released from the grip of the claws and placed on the paper stacking table. They are dropped and stacked.When stacking, the printed surface is coated with varnish and dried, so the printed surface will not be stained.

[Problem to be solved by the invention]

However, in such conventional varnish coating equipment, as mentioned above, the varnish remaining on the deposition roller as a result of being transferred to the coater cylinder is all scraped off by the blade and becomes zero, so the amount of varnish decreases. The problem is that adjustment is extremely difficult.

[Means for Solving the Problems] In order to solve such problems, in the present invention, a rider roller is brought into contact with a landing roller disposed between the original roller and the coater cylinder, and the tip of the blade is attached to the rider roller. A varnish removal device was attached with two facing each other.

[For production]

As each roller rotates, the varnish that has been transferred from the original roller side to the coating roller is transferred from the coating roller to the coater cylinder.
It is applied to the printed surface of the printed material as it passes between the coater cylinder and the impression cylinder. In this case, the varnish on the deposition roller is transferred not only to the coater cylinder but also to the rider roller and scraped off by the blade, so that the varnish on the deposition roller never becomes zero, and a predetermined amount of varnish always adheres.

〔Example〕

The figure is a schematic front view of the varnish coating apparatus according to the present invention. In figure 0, the varnish coating apparatus 1 includes an impression cylinder 2
A coater cylinder 3 whose peripheral surface is wrapped with a blanket is disposed above the impression cylinder 2 so that its peripheral surfaces are in contact with each other. On the other hand, a varnishing boat 5 in which varnish 4 is stored is arranged above the coater barrel 3, and inside this varnishing boat 5,
A former roller 6 that is rotationally driven from the driving side is provided immersed in varnish 4. Furthermore, between the original roller 6 and the coater cylinder 3, a metering roller 7 whose circumferential surface is in contact with the original roller 6 is provided.
A deposition roller 8 whose peripheral surface is in contact with the metering roller 7 and the coater cylinder 3 are arranged so as to be rotated in the same direction as shown by arrows in the figure. A claw is provided in the notch on the outer periphery of the impression cylinder 2, which grips and conveys the paper 9 by rotation thereof.

On the other hand, on the side of the machine, a base tank 11 storing varnish 10 and a cleaning liquid tank 13 storing cleaning liquid 12 are arranged side by side, and between the varnish tank 1 and the varnish boat 5, A varnish supply pipe 14 and a varnish discharge pipe 16 equipped with a pump 15 are connected. Also, a pump 18 is connected between the cleaning liquid tank 13 and the nozzle 17 above both rollers 7°8.
They are connected by a pipe 19 equipped with. 20 is both tanks 1
1.13 is a heater that heats the varnish 10 and the cleaning liquid 12.

In this device, a rider roller 21 supported by a bearing so as to be movable up and down is disposed with its circumferential surface facing the formation roller 8, and furthermore, a long gutter-shaped container is provided on the side of the rider roller 21. 22 and a long plate-shaped blade 23 supported at its front end. 25 is a stirrer for stirring the varnish 10 in the varnish tank 11.

Reference numeral 26 denotes a machine cleaner formed of a long gutter-shaped container 27 and a doctor knife 28 supported by the container and whose tip is in contact with the circumferential surface of the forming roller 8. 27.

The varnish coating operation by the varnish coating apparatus configured as above will be explained. Each roller 2, 3, 6.
7 and 8. After placing 21 in opposition and starting the pump 15,
When the printed paper 9 is run, the varnish 4 in the varnish boat 5 heated by the heater 20 and stirred by the stirrer 25 is pulled up by the rotating nine rollers 6 and adheres to its surface as a varnish film. Then, it is transferred to the metering roller rough and metered. This varnish film is transferred to the deposition roller 8 and then to the coater cylinder 3, where it is applied to the printing surface of the paper 9 passing between the coater cylinder 3 and the impression cylinder 2.

In such a varnish coating operation, the application roller 8
The upper varnish is transferred to the rider roller 21 that is in contact with it, scraped off by the blade 23, and discharged into the container 22. Therefore, the amount of varnish on the application roller 8 never becomes zero, and a predetermined amount of varnish is always attached.

When cleaning the rollers and the inside of the varnishing boat 5 after the varnish coating work is completed, when the pump 18 is started without rotating each roller facing each other, the cleaning liquid 12 in the cleaning liquid tank 13 passes through the pipe 19 to the nozzle. The cleaning liquid and the varnish removed by the cleaning are scraped off by the doctor knife 28 of the machine cleaner 26 and discharged into the container 27.

〔Effect of the invention〕

As is clear from the above description, in the varnish coating apparatus for printed matter according to the present invention, a rider roller is brought into contact with a landing roller disposed between a source roller and a coater cylinder, and the tip of a blade is attached to this rider roller. By installing a varnish removal device in contact with the varnish removal device, during varnish coating work, the varnish transferred to the formation roller is transferred to the rider roller that rotates in opposition to the formation roller, and is discharged into the container by the blade of the varnish removal device. Since a predetermined amount of varnish is always attached to the formation roller, it is relatively easy to adjust the amount of β-stain, and the varnish coating on the printed matter is uniformly applied, improving the quality of the printed matter. .

[Brief explanation of drawings]

The figure is a schematic front view showing an embodiment of a varnish coating apparatus for printed matter according to the present invention. 1... Varnish coating device, 3... Coater cylinder, 6... Original roller, 8... Closing roller, 21...
- Rider roller, 22... container, 23... blade, 24... varnish removal device. Patent applicant Komori Printing Machinery Co., Ltd.

Claims (1)

[Claims] A varnish coating device for printed matter, characterized in that a varnish removal device is provided in which a rider roller is placed in contact with a landing roller disposed between a source roller and a coater cylinder, and a tip of a blade is placed in contact with the rider roller. .