JPS5889368A - Method of preventing diffusion of solvent gas for gravure printing and the like - Google Patents

Abstract

PURPOSE:To prevent diffusion of solvent gas into a working environment, by a method wherein a blowing and drying device is mounted to the rear of a printer, an air laminar flow device is installed to the front of the printer, and a cover is set to the ink pan of the printer. CONSTITUTION:A nozzle 8 for air blowing having a width of a printing or a painting plate 1 or an ink pan 3 is located to a lower part of a drier 4, and a laminar flow plate 11 is mounted to the forward end of the nozzle 8 so that air is blowed in a laminar manner. A suction port 9 is formed in a part where a laminar flow air reaches an under surface. Air, sucked through the suction port, is blowed out again through the nozzle 8 by a blower fan 15 after its passage through a duct 12, a suction fan 13, and a filter 14. Additionally, a freely openable cover 5 is installed to the ink pan 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a solution to the problem that, in gravure printing or coating work, etc., when solvent evaporates from printing or coating units, the solvent unnecessarily diffuses between units, and furthermore, workers and The present invention relates to a method 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.

In the 11 conventional gravure printing machines for flexible packaging, etc., there is a certain open area before the printing material enters the printing drying device from the printing section, and consideration has been given to preventing unnecessary diffusion of solvent from this area. However, even if an auxiliary drying device is installed, 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 carried out at the start of printing, during changes in paper running conditions directly related to paper splicing, or during times when registration is not achieved due to printing troubles, and monitoring of plates and ink is carried out. 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 printing 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 an ink pan (3) and a cover (5) of the printing device. The organic solvent gas in the air sucked by the blow drying device in the printing or coating unit is prevented by a laminar air film from spreading into the working environment of the solvent gas that accumulates unnecessarily in the printing or coating unit. This is a method for preventing diffusion of solvent gas in gravure printing, etc., characterized in that the suction amount of the solvent gas-containing air accumulated in the unit is controlled in order to prevent the concentration from decreasing more than necessary.

An embodiment of the method of the present invention will be described with reference to the drawings.
] Or, an air blowing nozzle (8) having the width of the coating plate (1) or the width of the ink pan (3) is installed at the bottom of the fixed or mobile heating suction drying device (4), and the nozzle (8) The tip is a laminar flow root blade that blows out air in a laminar flow)
Set it up. Next, a suction port (9) is provided at the portion where the laminar air reaches the lower surface. At this time, the width of the upper nozzle (8) and the slit width of the lower suction port (9) do not necessarily need to be the same width, taking into account that if laminar air expands slightly depending on the flow velocity. do not.

Also, the width of the suction port (9) corresponds to the projection width at the top,
The suction port (9) should be placed as low as the working room floor level so that there is no problem even if workers step on it, but in some cases, the upper air outlet (8) may be The suction port (9) is installed at a certain angle, and the corresponding suction port (9) is raised appropriately above the floor surface, and the suction duct of the suction port (9) is placed at about the same level as the pan (3) that stores the ink or coating agent. There is no hindrance to increasing the suction efficiency by advancing the valve.

Next, as shown in Figure 2, the air film sucked in from the suction port (9) passes through an underground or above-ground duct connected to this, passes through a filter, passes through a forced fan, and is blown out again. It is blown out from the nozzle (8) in a laminar flow and sucked in again. az is the duct on the suction side and the blowout side, Q31 is the suction fan, (141 is the filter, and (151 is the forced air blowing fan. In this case, depending on the balance of suction and blowing, it can be used as a single suction and forced fan, or Alternatively, there may be a plurality of forced fans and a plurality of suction fans.

Incidentally, in such printing or coating operations, air turbulence and wind generation in the printing section or coating section are generally undesirable. To avoid quality problems caused by plate drying, we have installed an ink pan made of light alloy, etc., with a structure that allows for adjustable width, and an ink pan that is easy to open and close (3).
This drawback can be eliminated by adding a cover (5). The cover (5) has an appropriate curved surface along the plate, and the vertical width can be adjusted to correspond to the size of the plate diameter. Similarly, the upper cover (6) is formed by loosening and tightening a dragon screw Q61, etc., which also has a curved surface.
to lengthen or shorten.

aη is the opening/closing hinge of the cover (5), and FIG. 2 shows a side view of these covers together. A flexible duct (101) is provided in a part of the suction and push yarn path so that it can follow the opening and closing of the cover of the drying device (4).

Figure 3 is a side view and a perspective view illustrating the integrated structure of the cover, and the cover (5) and the upper cover (6), which open and close via a hinge a force, are suitable for covering the plate cylinder (1). Each has a curved surface, and each is fixed in an arc shape of an appropriate length by screwing a duck screw+161.t+M+ into a long hole (I81). The air outlet (8), the suction port (9), and the covers (5), (6)
The structure type of is not limited to this.

According to the method of the present invention, during printing or coating operations, the operator is protected from evaporating solvent gas, and the indoor environment is preserved.
The generated solvent gas is discharged to the outside by the suction operation of the drying device (4), and the suction operation is further controlled so that the suction operation is suppressed more than necessary, and the suction operation is performed at the necessary concentration of solvent gas. , the suction amount of the solvent gas-containing air accumulated in the coating unit is controlled, and in that case, the printing material web paper (7
) is achieved by adjusting the suction within a range where the drying process does not stagnate. Exhaust gas discharged with an appropriate concentration of solvent gas is extremely effective in improving treatment efficiency through recovery treatment such as Lq combustion exhaust heat recovery.On the other hand, the leakage of the solvent gas into the working environment is prevented through the blower outlet. This is prevented by the air flowing in layers from the suction port to the seal!
11 or the application area and the work space can be isolated and connected by laminar air flow, eliminating the hassle of handling auxiliary equipment for preventing diffusion of heavy solvent gases made of heavy structural materials during printing. It has a remarkable effect on making work more comfortable, preventing pollution from contaminating the working environment, and improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view illustrating an embodiment of the method of the present invention;
The figure is a side view illustrating an embodiment of the method of the present invention + Figure 3 shows the cover structure of the ink pan used in the method of the present invention. Patent applicant figure 2

Claims (1)

[Claims] 1) In gravure printing or coating work, etc., a blow drying device is provided at the rear of the printing device, an air laminar flow device is provided at the front of the device marked 1j, and the ink puff (31K cover (5)) of the printing device is provided. Solvent gas diffusion for gravure printing, etc., characterized in that the laminar flow air film of the flow device prevents the diffusion of solvent gas unnecessarily accumulated in the printing or coating unit into the working environment. 2) In order to prevent the concentration of organic solvent gas in the air sucked by the blow drying device in the printing or coating unit from decreasing more than necessary, the amount of suction of the air containing solvent gas accumulated in the unit is reduced. 2. A method according to claim 1, characterized in that the method is controlled as follows.