JPH0318185Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a drying hood in a printing press.

A printing press, for example a gravure printing press, has a number of printing units, each printing unit having a printing section and a drying device for drying the ink on the paper after printing. This drying device has a nozzle that blows hot air onto the running paper, and a drying hood that collects the blown hot air.Furthermore, the outside of the drying hood is coated with insulation to prevent heat loss and burns. There is. However, the heat insulating material increases the volume of the drying device, and in particular, the heat insulating material applied to the back of the drying hood has the disadvantage that it reduces the working space with the adjacent printing unit.

The present invention aims to eliminate the drawbacks of the prior art, and aims to provide a drying hood that prevents the outer wall of the hood at a desired location from becoming hot due to hot air and does not require insulation. do.

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 indicates paper immediately after printing, and a drying device 2 is disposed on the travel path of the paper 1. As shown in FIG. Drying device 2 has hot air supply port 3
It has a hot air chamber 4 communicating with the hot air chamber 4, a nozzle 5 for blowing hot air in the hot air chamber onto the paper 1, a guide roller 6 for the paper 1, a drying hood 7 surrounding the running paper 1, the hot air chamber 4, etc. The drying hood 7 communicates with an exhaust port 8 and is suctioned by an external blower (not shown). The inside of the drying hood 7 is maintained at a slightly negative pressure state so that the evaporated solvent does not come out. Therefore, outside air is sucked in through the paper inlet 9 and paper outlet 10 provided in the drying hood 7. There is.

Inside the drying hood 7, an inner wall 7B is provided adjacent to the hood outer wall 7A. One end of the inner wall 7B is located near the paper inlet 9 or paper outlet 10, and the other end extends near the exhaust port 8. Thus, due to suction from the exhaust port 8, a portion of the cold air sucked in from the paper inlet 9 and the paper outlet 10 flows through the passage 7C between the outer wall 7A and the inner wall 7B.
Therefore, the outer wall 7A is protected from the hot air in the space 7D further inside the inner wall 7B, the temperature of the outer wall does not rise much, and there is no need to attach a heat insulating material to the outer surface of the outer wall 7A. On the other hand, the cold air flowing through the passage 7C absorbs heat from the hot air inside through the inner wall 7B on the way, but after being sucked outside from the exhaust port 8 together with the hot air inside the hood, it is heated by a heating device (not shown). Since it is reheated and sent to the hot air supply port 3 for effective use, thermal energy is effectively used and heat loss is reduced.

In the above embodiment, the inner wall 7B was provided on almost the entire surface of the outer hood wall above and behind the hot air chamber 4, but the inner wall 7B does not necessarily have to be installed on the entire surface of the hood outer wall, but only on a part of the hood outer wall. If you want to protect from the hot air inside, you only need to install it in that area.

As described above, in the present invention, an inner wall is provided close to the outer wall of the hood, and the cold air sucked in from the paper inlet or outlet is passed through the passage between the outer wall and the inner wall, so that the outer wall of that part is There is no high temperature due to the hot air inside, so there is no need to provide heat insulation, the installation space can be reduced, equipment costs are reduced, and thermal efficiency is also improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the - arrow in FIG. 1... Paper, 2... Drying device, 4... Hot air chamber, 5... Nozzle, 7... Drying hood, 7A...
Outer wall, 7B...inner wall, 7C...passage, 8...exhaust port, 9...paper entrance, 10...paper exit.

Claims (1)

[Scope of utility model registration request] In a drying hood that is provided to surround a running paper, an inner wall is provided close to the outer wall of the hood, one end of the inner wall is located near the inlet or outlet of the paper, and the hood is connected to the paper from the inlet or outlet of the paper. A drying hood for a printing press, characterized in that the drying hood for a printing press is configured so that a part of the air sucked into the hood flows between the inner wall and the outer wall.