JPS5953109B2 - Air floating treatment method for web - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the air floating treatment method for webs during coating, and when a solution is applied to one or both sides of a running thin web and dried with hot air, nothing can be done until the end of the drying process. The purpose of this technology is to utilize the flow of heated air to hold and pass the web without touching the web, thereby enabling efficient floating.

As a conventional method of web floating processing method, the first method is
As shown in the figure, the upper and lower wind cylinders are placed in different positions to create waves in the web, and as shown in Figure 2, the upper and lower wind cylinders are not opposed to each other but arranged at a wider pitch. However, there are systems that continuously apply the air floating effect of individual wind cylinders. However, the present invention makes the air flow more laminar by bringing the upper and lower wind cylinders as close as possible to the web, so that it hits the web evenly and well, thereby eliminating web flapping, and improving the flow of supplied heated air. We have developed a floating treatment method that increases drying efficiency.

The gist of the present invention is as follows.

On the upper and lower surfaces of a traveling web 2, wind cylinders 1 whose opposite sides are formed in an arc shape with a slight gap between them are positioned with respect to each other by about 1/2 pitch of the length of the wind cylinder. A slit nozzle 3 for blowing hot air, which is arranged in parallel and offset and opposed to each other, is inclined at 450 degrees in the direction of travel of the web on the opposite side of the web inlet side portion of the wind cylinder 1 . The running web 2 is provided with an air blowing hole 4 for air blowing and a suction hole 5 for reducing pressure on the opposite side of the web outlet side, and the running web 2 is made to pass in a wavy manner in the gap between the bus lines passing between the upper and lower wind cylinders 1. The hot air is blown out in the same direction as the web 2 from the hot air blowing slit nozzles 3 on the upper and lower surfaces of the web, so that a difference in wind speed always occurs between the upper and lower surfaces of the web 2. It is designed so that air floating can be performed by moving the vehicle.

As described above, the present invention has a gentle arc shape that spans the entire length of one wind cylinder 1, and has a hot air blowing slit 5 inclined at about 450 degrees in the direction of travel of the web at the entrance side of the web. The slit nozzle 3 has an air blowing hole 4 on the inlet side for preventing contact with the web, and the air blown from the slit nozzle 3 flows on an arcuate surface at high speed at the outlet side of the wind cylinder 1. A large number of small suction holes 5 are provided which serve to gradually reduce the amount of air as it flows.

The wind cylinder 1 configured in this manner is opposed to the web with a slight gap above and below, and by arranging the upper and lower ones in parallel with each other with a pitch of approximately 1/2, the gap is small with respect to the web. The running web travels in a wavy manner in accordance with the air that is forced to flow on the upper and lower surfaces.

Therefore, the velocity (pressure) of the air flowing on the upper and lower surfaces of the web is:
There is always a difference, and the web 2 can be efficiently floated by the wind cylinder 1. Therefore, depending on the drying conditions, the wind speed blown from the hot air blowing slit nozzle 3 may be set to 2 to 50 M, for example.
/S or more, a balance of laminar flow can be obtained by moving the gap between the wind cylinder 1 and the web 2 up and down, the fluttering of the web can be eliminated, and afloating can be carried out efficiently. It is.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams of the conventional method, FIG. 3 is an explanatory diagram of the implementation mechanism according to the present invention, and FIG. 4 is an enlarged explanatory diagram showing the same section in section. 1... Wind cylinder, 3... Slit nozzle for blowing hot air,
4...Air blow-off hole, 5...Suction hole for pressure reduction.

Claims (1)

[Claims] 1. On the upper and lower surfaces of the running web, with a slight gap between them,
Wind cylinders each having a circular arc shape on the facing side of the web are arranged in parallel with the upper and lower sides facing each other with their positions shifted by approximately 1/2 pitch of the wind cylinder length, and the inlet side portion of the web of the wind cylinder is arranged in parallel. A slit nozzle for blowing hot air and an air blowing hole that are inclined in the traveling direction of the web is provided on the opposite side of the web, and a suction hole for depressurization is equipped on the opposite side of the web exit side. The hot air is passed in a wavy manner in the gap between the pass lines passing between the webs, and is blown out in the same direction as the web from the hot air blowing slit nozzles on the upper and lower surfaces of the web, which always creates a difference in wind speed between the upper and lower surfaces of the web. An air floating treatment method for a web, characterized in that air floating can be performed by running the web without contacting the web.