JPH0231664B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the invention, in gravure printing or coating operations, etc., when the solvent evaporates from the printing or coating units, the solvent unnecessarily diffuses between the units, and furthermore, the operator and The present invention relates to a device for isolating and closing a printing or coating section and a work space to prevent diffusion of solvent gas and the like so as not to deteriorate the indoor environment.

Conventional gravure printing machines for flexible packaging, etc.
There is a certain open area before the printing material enters the printing dryer from the printing section, and is there any consideration given to preventing unnecessary diffusion of solvent from this area?
Even if an auxiliary drying device is provided, the actual situation is that the structural material is heavy and difficult to use, or that it is inconvenient to handle.

In gravure printing operations, a certain space is required in which the printing surface can be visually observed until the printing material enters the drying device from the printing section. In such a space, monitoring is performed at the start of printing, immediately after paper splicing, changes in the paper running state, or when registration is not achieved due to printing troubles, and the plate and ink are monitored. However, once these operations, monitoring and coordination return to normal, operations in this fixed space do not require entry. However, conventionally, no consideration has been given to this aspect. This causes diffusion of solvent gas from the space, which causes disturbances in the indoor working environment. The present invention isolates the atmosphere within the frame of the machine from the operating range of the operator so that such solvent gas does not spread unnecessarily, and further suctions the solvent gas using the suction duct of the drying device to make it as comfortable as possible. This will enable them to engage in various tasks.

In gravure printing or coating work, the present invention provides a blow drying device at the rear of the printing device, an air laminar flow device at the front of the printing device, and a cover 5 attached to the ink pan 3 of the printing device. The laminar air membrane prevents the solvent gas that unnecessarily remains in the unit from diffusing into the working environment, and the concentration of organic solvent gas in the air sucked by the air drying device in the printing or coating unit is reduced more than necessary. This is a solvent gas diffusion prevention device for gravure printing, etc., characterized in that the suction amount of solvent gas-containing air staying in the unit is controlled in order to prevent this.

An embodiment of the device of the present invention will be described with reference to the drawings.The air blowing nozzle, which has the width of a printing or coating roll 1 such as a gravure printing plate or the width of an ink pan 3, has an air blowing outlet 8 fixed or movable for heating and suction. It is installed at the bottom of the drying device 4, and a laminar flow plate 11 is provided at the tip of the air outlet 8 to blow out air in a laminar flow. Next, a suction port 9 is provided at a portion where the laminar air reaches the lower surface. At this time, the width of the upper blow-off port 8 and the slit width of the lower suction port 9 are determined by taking into account that if the laminar air expands slightly depending on the flow velocity,
They do not necessarily need to be of equal width. In addition, the width of the suction port 9 corresponds to the width of the upper blowout.
The air outlet 8 at the top should be set at a certain angle so that it is as low as the working room floor level so that there is no problem even if workers step on it. and the corresponding suction port 9
There is no problem in raising the suction duct of the suction port 9 to about the level of the pan 3 that stores the ink or coating agent to improve the suction efficiency.

Next, the air film sucked from the suction port 9 passes through an underground or above-ground duct connected to the suction port 9 as shown in Fig. 2, passes through a filter, passes through a push-in fan, and returns to the blowout port. 8, it is blown out in a laminar flow and sucked in again. 12 is a suction side and a blowout side duct, 13 is a suction fan, 14 is a filter, and 15 is a forced blower fan. In this case, depending on the balance between suction and blowing, a single fan may be used for both suction and pushing, or a plurality of pushing fans and a plurality of suction fans may be used.

Incidentally, in such printing or coating operations, it is generally undesirable for air turbulence or wind generation around the printing section or coating section to occur. To prevent quality problems caused by drying of the plate, we have taken measures such as installing a structure that can adjust the vertical width, using a material such as a light alloy, and installing a cover 5 for the ink pan 3 that is easy to open and close. is excluded. cover 5
The butterfly screw 16 has an appropriate curved surface along the plate, and the vertical width adjustment corresponds to the size of the plate diameter.
The upper cover 6 can be extended or contracted by loosening or tightening.

17 is a hinge for opening and closing the cover 5, and FIG. 2 shows a side view of the cover body. A flexible duct 10 is installed in a part of this suction and pushing system so that it can follow the opening and closing of the cover of the drying device 4.
Set it up.

FIG. 3 is a side view and a perspective view illustrating the structure of the cover body. The cover 5 and the upper cover 6, which are opened and closed via a hinge 17, have an appropriate curved surface to cover the plate cylinder 1. Each has long hole 1
8 with butterfly screws 16, 16' to fix it in an arc shape of an appropriate length. Although the method of the present invention is carried out using a structural device as shown in the above-mentioned embodiments, the structures of the air outlet 8, suction port 9, and covers 5 and 6 are limited to this. It's not a thing.

According to the apparatus of the present invention, during printing or coating work, the operator is protected from diluent solvent gas and the indoor environment is maintained, and the generated solvent gas is discharged outside by the suction operation of the drying device 4, and furthermore, the suction operation The system controls the suction amount of the solvent gas-containing air that remains in the printing/coating unit so that the suction operation is performed at the necessary and appropriate concentration of solvent gas, while suppressing suction operation that is more than necessary. This is achieved by adjusting the suction within a range where the drying action of the paper 7 does not stagnate. Exhaust gas discharged with an appropriate concentration of solvent gas is extremely effective in improving processing efficiency through recovery processing or combustion exhaust heat recovery.On the other hand, leakage of the above solvent gas into the working environment is prevented by suction from the outlet. It is prevented by air flowing in a laminar manner at the mouth, and can isolate and close the printing or coating area and the work space by laminar air flow, and is equipped with auxiliary equipment to prevent the diffusion of solvent gases made of heavy structural materials. It eliminates the hassle of handling during printing, allows for comfortable work, and has a remarkable effect on preventing pollution caused by contamination of the work environment and improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating an embodiment of the apparatus of the invention, FIG. 2 is a side view illustrating an embodiment of the apparatus of the invention, and FIG. 3 shows a cover structure of an ink pan used in the apparatus of the invention.

Claims (1)

[Scope of Claims] 1. Printing coating comprising a printing coating roll 1 such as a gravure printing plate, a pressure roll 2 opposing the printing coating roll 1, and an ink pan 3 for adhering and supplying ink and paint to the printing coating roll 1. A gravure printing or coating device comprising a unit, a heating suction drying device above the unit, and a web feeding path that passes between a printing coating roll 1 and a pressure roll 2 and is introduced into a heating suction drying device 4. Solvent gas diffusion for gravure printing, etc., characterized in that an air laminar flow device consisting of an air outlet 8 and an air suction port 9 is provided at the front of the printing coating unit, or at the front of the unit and the web feeding path. Prevention device. 2. In order to prevent the concentration of organic solvent gas in the air sucked by the heating suction drying device in the printing or coating unit from decreasing more than necessary, the heating suction drying device removes the solvent gas-containing air that remains around the unit. 2. The device according to claim 1, wherein the amount of suction is controlled.