JPH0143230Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printing paper crease removal device that can be applied to commercial rotary presses.

In order to evaporate the ink solvent on printing paper (web) after printing with a printing machine, it is necessary to heat the web to over 100°C. During this drying process, the water on the web also tries to evaporate, but the amount of water evaporated differs between areas with and without an ink film, and the difference in shrinkage causes wrinkles in the running direction of the web.

FIG. 1 shows the roll arrangement of a conventional cooling device installed downstream of the drying device. In the figure, 1 is the web, 2 is the No. 1 cooling roll, 3 is the No. 2 cooling roll, and 4 is the No. 3 cooling roll.
Although FIG. 1 shows a case where there are three rolls, two to four rolls are normally used, and the number is not limited.

Now, in FIG. 1, the ink film that has been heated in a drying device to evaporate the solvent in the ink is cooled by contacting the cooling rolls 2, 3, and 4, and the ink film is fixed (set) on the web 1.
At this time, the wrinkles in the web 1 that had occurred due to the above-mentioned reasons were also fixed together with the ink film, and remained as so-called fire wrinkles.

The present invention was proposed to solve the above-mentioned conventional drawbacks, and consists of multiple layers of arc-shaped plates arranged downstream of the printing paper drying and cooling section, the printing paper being reversed between each plate, and It is an object of the present invention to provide a printing paper wrinkle removal device that can remove wrinkles in a cooling section by providing a pressing guide roll.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 2 shows a state in which a wrinkle removing device according to an embodiment of the present invention is installed downstream of a conventional cooling section. In Figure 2, 1 is the web, 2 is the No. 1 cooling roll, 3 is the No. 2 cooling roll, and 4 is the web.
No. 3 is a cooling roll, 5 is a shell plate, and 6 is a guide roll.

The shell plates 5 are arranged concentrically in multiple layers, and are designed to have a large surface area with a small installation area. The cooling rolls 2, 3, and 4 constitute a conventional cooling section, and the shell plate 5 and guide roll 6 constitute a crease removing device according to the present invention. Note that the shell plate 5 is designed to reduce friction with the web 1.
The web running surface is coated with Teflon, for example, or air is blown out to form an air film between the web 1 and the shell plate 5.

Next, to explain the operation, web 1 is No. 1 to No. 3.
After passing through a cooling section consisting of cooling rolls 2 to 4, the shell plate 5 passes through a guide roll 6 and comes to rest.
, it runs with one side pressed against it, is reversed by the next guide rolls 6a and 6b, runs while the opposite side is pressed against the next stationary shell plate 5a, and in the same way, alternately reversing the pressed surface. I'm going to run.

The wrinkles on the web that occur in the drying equipment are
Once the temperature reaches room temperature, if the following conditions are satisfied, the wrinkles will disappear or the size of the wrinkles will become smaller.
That is, it is pressed against a smooth surface for several seconds while applying tension. Also, if the above-mentioned operation is performed on both sides rather than only one side, wrinkles are more likely to be reduced.

Therefore, if the web travels while being pressed against a shell plate having a long contact length by alternately inverting the pressing surface, the wrinkles will disappear or the size of the wrinkles will be reduced.

In addition, in order to have the same effect, it is possible to install a large-diameter drive roll or a large number of small-diameter drive rolls, but this increases the installation area and increases the cost. As in the embodiment of the present invention, it is preferable to use a concentric multi-layer stationary shell plate and a guide roll.
Further, even if the shell plate is stationary, the printing ink on the web is fixed (set), so that the printing surface is not smudged.

[Brief explanation of drawings]

Fig. 1 is a side view showing the arrangement of rolls in a conventional printing paper cooling device, and Fig. 2 is a side view showing a printing paper crease removal device according to an embodiment of the present invention installed downstream of the cooling device. It is a diagram. Explanation of the main parts of the diagram, 1...web, 2, 3,
4...No.1 to No.3 cooling rolls, 5, 5a...
...Shell plate (arc-shaped plate), 6, 6a, 6b...
guide roll.

Claims (1)

[Scope of utility model registration request] A multi-layer arc-shaped board is arranged downstream of the printing paper drying and cooling section, and the printing paper is inverted between each board.
A device for removing creases from printing paper, characterized in that it is equipped with a guide roll that presses against the board material.