JPS5953110B2 - Air floating treatment method using air float type nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved air floating treatment method using an air float nozzle for a web during coating.

The inventor of the present invention proposes that when coating one or both sides of a running thin web and drying it with hot air, the web is held and passed through using the flow of heated air without touching anything until the end of the drying process. Patent Application No. 126272 filed in 1978 has already been published to enable efficient floating.
Disclosed in the issue.

By the way, when a coating liquid with extremely low viscosity, such as water, is used, during the drying process, the web becomes small wave-like undulations due to the action of tension in the width direction, which causes the coating liquid to flow. As a result, the product is likely to have vertical streak-like uneven coating. Furthermore, if the web is a thin film of 4 to 6 microns, running under slight tension is required. Therefore, in the present invention, as the drying treatment conditions, slight tension,
We have developed a processing method that enables smooth running. That is, an air floating treatment method using an air float type nozzle that reduces the tension on the web in the traveling direction and also generates tension in the width direction, thereby making it possible to run smoothly and with slight tension over the entire area of the web. It is.

The gist of the present invention is as follows.

Arc-shaped wind cylinders are arranged parallel to each other on the upper and lower surfaces of the running web, facing each other with their positions shifted by approximately 1/2 pitch,
Two blowout nozzle slits are inclined approximately 450 degrees in the forward direction and in the opposite direction to the web traveling direction, and each nozzle slit has a large number of slit holes that are inclined approximately 450 degrees from the bottom of the V shape and simultaneously blow out air on the left and right toward the central partition plate. However, by forming the diameter of the slit hole so that it is large at the center in the width direction of the web and gradually becomes smaller toward the outside, the air pressure is uniform across the width and direction in the V-shaped space created by the nozzle slit. is formed and flows out to both outsides to form a vortex, which is passed in a wavy manner at the interval between the bus lines passing between the upper and lower wind cylinders, and the running web is pushed up by the pressure of the vortex in the V-shaped space, creating an arcuate shape of the wind cylinder. The same waveform is created and tension is generated in the width direction as well.
This is an air floating treatment method using an air float type nozzle, which is characterized in that the web can run smoothly and with slight tension over the entire area of the web.

Next, the present invention will be explained with reference to the drawings.

As shown in FIG. 1, wind cylinders 2 are formed on the upper and lower surfaces of the web 1, with the opposite side facing the web 1 having an arc shape with a slight interval therebetween.
are arranged parallel to each other so as to be offset by approximately 1/2 pitch of the length of the wind barrel relative to the upper and lower ones.

(See FIGS. 2 and 3) Two hot air blowing nozzles 3, 3'' are provided from the center of each wind cylinder 2 at an angle of 45 degrees in the advancing direction and in the opposite direction with respect to the web 1.

Due to this flow of hot air flowing at a high speed (20 to 40 M/S), the web 1 has a shape in which both the left and right sides are drawn along the arcuate wind cylinder 2 without touching it.

There is a V-shaped space 4 between the left and right inclined blowout nozzles 3 and 3″.
are provided, the center of which is partitioned by a vertical plate 5.

A large number of slit holes 6 are arranged to blow out hot air from the bottom of the V-shaped space 4 at an angle of 45 degrees toward the plate 5 on both the left and right sides in order to maintain uniform air pressure in the width direction. The diameter is large at the center, and the closer it is to the end, the smaller it is.

The hot air blown out from the plurality of slit holes 6 hits the central partition plate 5 and generates two vortices on the left and right sides (see FIG. 2). The hot air blown out from the slit holes 6 flows outward in the width direction from the center of the web 1 in the form of a vortex (see FIG. 3).

Moreover, this V-shaped space 4 exerts a positive pressure on the web 1, and simultaneously works to push up the web, thereby holding the web 1 in a curve close to the arcuate curvature of the wind cylinder 2. Moreover, it is also possible to generate tension in the width direction.

As described above, the hot air blowing nozzles 3, 3'' blowing out left and right reduce the tension required for the web 1 in the traveling direction, and the vortex action of the V-shaped space forms an ideal waveform, while also forming a wave in the width direction. By generating tension, the web maintains its smoothness no matter where it is placed and enables air floating running.

[Brief explanation of the drawing]

Fig. 1 is an explanatory side view of the implementation mechanism according to the present invention, Fig. 2 is an enlarged explanatory view showing the same part in cross section, and Fig. 3 is an explanatory view showing a part in longitudinal section of Fig. 2. It is. DESCRIPTION OF SYMBOLS 1... Web, 2... Wind barrel, 3,3''... Hot air blowing nozzle slit, 4-... V-shaped space, 5... Partition plate, 6... Slit hole.

Claims (1)

[Claims] 1 Arc-shaped wind cylinders are arranged in parallel on the upper and lower surfaces of the running web, facing each other with their positions shifted by approximately 1/2 pitch, and are arranged at an angle of approximately 45° in the forward direction and in the opposite direction to the traveling direction of the web.
Two slanted blowout nozzle slits are provided so that each nozzle slit forms a V shape, and a large number of slit holes are arranged at an angle of about 45 degrees from the bottom of the V shape to simultaneously blow out air on the left and right toward the central partition plate, The diameter of the slit hole is large at the center in the width direction of the web and gradually becomes smaller toward the outside, thereby creating a uniform air pressure in the width direction in the V-shaped space formed by the nozzle slit. The web flows out to the outside to form a vortex, which is passed in a wave pattern between the pass lines passing between the upper and lower wind cylinders. An air floating treatment method using an air floating nozzle, characterized in that the same waveform is created and tension is generated in the width direction so that the web can run smoothly and with slight tension over the entire area of the web.