JP3334044B2 - Web heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat treatment apparatus for heating a web such as paper, film, metal foil, cloth or the like by hot air.

[0002]

2. Description of the Related Art Conventionally, as a heat treatment apparatus for heat-treating a web W, an apparatus having a plurality of nozzles arranged inside a trunk chamber along the front-rear direction of the web W as shown in FIG. (US Pat. No. 5,370,289)
issue).

[0003] As shown in FIG.
A slit 102 for blowing hot air is provided at the front of the upper surface of the nozzle 100, and a perforated plate 106 having a plurality of holes 104 opened from the rear end of the upper surface of the nozzle 100,
Further, from the rear end of the perforated plate 106,
8 is extended.

The operation of the nozzle 100 will be described.

[0005] The web W is caused to travel in the front-rear direction over a plurality of nozzles 100 arranged in the front-rear direction of the trunk room. Hot air is blown obliquely rearward from the slit 102 of the nozzle 100 toward the lower surface of the web W. Then, the hot air passes through the upper surface of the nozzle 100 and thereafter reaches the plate plate 108 via the plate 106 with holes. In this case, air enters upward through the hole 104 opened in the plate 106 with holes.

As described above, the hot air blown from the nozzle 100 passes through the plate 106 with the holes and the plate 108, so that the hot air can flow stably without forming a vortex due to the air entering from the holes 104. .

[0007]

By the way, in the nozzle 100, a hot air is blown from the lower surface of the web W to form a floating state, and the web W is sucked to the nozzle 100 by a force called a co-under effect.

Although the flow of hot air is stable as described above, there is a problem that the web W after sucking is unstable.

More specifically, the hot air blown out from the slit 102 of the nozzle 100 hits the web W, pushes up the web W, and sucks the web W to the pressure surface of the nozzle 100 by the Coneard effect. After exceeding the lowest point of the web W, the hot air that has consumed the energy is discharged to a space wider than the end of the plate 108 through the space formed by the web W and the plate 106 with holes.

At this time, as shown in FIG. 4, the hot air discharged into a wide space causes a sudden deceleration or a vortex, which causes a problem in that the web W is vertically vibrated. there were.

Accordingly, the present invention provides a web heat treatment apparatus which not only allows the flow of hot air to flow smoothly, but also allows the web to run stably by stabilizing the pressure applied to the web.

[0012]

According to a first aspect of the present invention, there is provided a web heat treatment apparatus in which a plurality of nozzles for blowing hot air from a lower surface of a web running in the front-rear direction are arranged in the front-rear direction. And a fin extending rearward from the nozzle, and a stabilizer disposed behind the fin, wherein a front end of the stabilizer is positioned below a rear end of the fin. Then, a gap is formed between the front end of the stabilizer and the rear end of the fin, and the stabilizer is inclined so that the rear end of the stabilizer is substantially the same as or slightly higher than the front end. It is arranged.

According to a second aspect of the present invention, there is provided a web heat treatment apparatus according to the first aspect, wherein a plurality of nozzles for blowing hot air also on the upper surface of the web are arranged in the front-rear direction.

In the web heat treatment apparatus having the above structure,
Hot air is rectified by the fins extending from the nozzle. Further, by providing the stabilizer at an angle, the pressure on the web increases again, and the second floating can be performed. Further, in order to release the excessively increased pressure, the pressure can be released from the gap between the fin and the stabilizer.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 is a longitudinal sectional view of a heat treatment apparatus 10 of the present embodiment. In the heat treatment apparatus 10, a web W of paper, film, metal foil (aluminum, copper), cloth, or the like is used.
Is heated with hot air having a wind speed of 20 m / sec to 40 m / sec.

The heat treatment apparatus 10 has a trunk room 12 having a heat insulating structure, and a web W extends from the front to the rear of the trunk room 12.
In the front-rear direction. In addition, trunk room 1
2 may not only be installed in the horizontal direction, but also be inclined so that the rear part is provided at a position higher than the front part. The front-back direction described below means the direction in which the web W travels.

Inside the trunk room 12, a plurality of lower nozzles 14 are arranged along the lower surface of the traveling path of the web W. Further, upper nozzles 16 are arranged on the upper surface of the traveling path of the web W. Then, the upper nozzle 16 and the lower nozzle 14
And are arranged in a zigzag pattern.

A lower duct 18 is provided below the lower nozzle 14 for sending hot air to the lower nozzle 14, and hot air is sent to the lower duct 18 via a circulation fan 20 and a heater 22. Similarly, an upper duct 24 is provided in the upper nozzle 16, and hot air is sent through the circulation fan 20 and the heater 22.

Here, the flow of the hot air in the heat treatment apparatus 10 will be described. The hot air circulated by the circulating fan 20 and the air sucked in from the outside through the filter 21 are heated by the heater 22 to become hot air, and then passed through the filter 23. It is sent to the lower duct 18 and the upper duct 24. The hot air blown from the lower nozzle 14 and the upper nozzle 16 onto the web W circulates again to the circulation fan 20. Unnecessary hot air is exhausted by the exhaust fan 25.

Next, the detailed structure of the lower nozzle 14 will be described with reference to FIG.

FIG. 2A is a longitudinal sectional view of the lower nozzle 14, and FIG. 2B shows the magnitude of the pressure P acting on the web W.

The lower nozzle 14 is divided into a lower space 30 and an upper space 32, and hot air is blown into the lower space 30 from the lower duct 18. Hot air is sent from the lower space 30 to the upper space 32 through a plurality of holes 34. A guide wall 38 is provided in the upper space 32 to guide the hot air to the slit-shaped outlet 36. The upper end of the front wall of the lower nozzle 14 facing the guide wall 38 is inclined so as to face the outlet 36.

From the upper end of the rear surface of the lower nozzle 14, the fins 4
0 is extended. The fin 40 is a closed plate without any openings such as holes and slits, and the rear end of the fin 40 is attached to be inclined slightly lower than the upper surface of the lower nozzle 14.

A stabilizer 42 is provided behind the fin 40. The stabilizer 42 is not provided with an opening such as a hole or a slit. The front end 42 a of the stabilizer 42 is located below and in front of the rear end of the fin 40. The stabilizer 42 is inclined such that it goes upward toward the rear, and the rear end 42b of the stabilizer 42 is
It is almost the same position as the height of 0. Thereby, a gap 44 is formed between the fin 40 and the stabilizer 42.

Here, the shape of the stabilizer 42 will be described in more detail. As shown in FIG. 2, the stabilizer 42 is made of a metal plate, the front end and the rear of which are bent. It is easy to flow.

A plurality of lower nozzles 14 as described above are arranged at predetermined intervals in the front-rear direction. Also, the upper nozzle 16
The structure is such that hot air is blown downward toward a substantially central portion of the fin 40 (point B in FIG. 2 described later).

An operation state of the heat treatment apparatus 10 having the above configuration will be described.

The web W traveling in the front-rear direction enters the interior of the trunk room 12 and becomes a floating state by the hot air blown from the lower nozzle 14, whereby the lower surface of the web W is heated. This heating state will be described in detail below. The upper surface of the web is heated by hot air from the upper nozzle 16.

Next, the flow of hot air from the lower nozzle 14 will be described.

The hot air blown from the lower duct 18 is
The web W once spreads in the width direction of the web W by the lower space 30 of the lower nozzle 14, and flows into the upper space 32 through the hole 34.
The hot air flowing into the upper space 32 flows along the guide wall 38,
The air is blown obliquely upward (upward and rearward) from the outlet 36.

The blown hot air hits the lower surface of the web W, and the pressure between the web W and the upper surface of the lower nozzle increases, and the pressure P reaches the maximum value at the point A in FIG. Thereafter, the hot air flows and the pressure P gradually decreases, and the web W is sucked to the point B of the fin 40 by the Coneard effect. This point B is the lowest point of the pressure P. Further, the hot air is rectified by the presence of the fins 40, and no vortex or the like is generated.

Thereafter, the hot air flowing on the lower surface of the web W flows to the position of the stabilizer 42. Since the stabilizer 42 is inclined upward toward the rear, the pressure P increases again, and the stability of the stabilizer 42 increases. The pressure again reaches the maximum at the rear end (point C).

As a result, the floating is performed twice at the point A of the fin 40 and the point C of the stabilizer 42, so that the area designated for the web W from below is increased, and the vibration of the web W is eliminated. Can be.

Further, since the gap 44 is provided between the fins 40 and the stabilizer 42, the pressure which is excessively increased above the stabilizer 42 can be released, thereby preventing the web W from being excessively blown up. be able to.

As described above, the vibration of the web W can be prevented by the rectifying effect of the fins 40 and the stabilizing plate 42, and the supporting force of the web W is improved by the pressing effect of the stabilizing plate 42. Stability can be ensured.

In the above embodiment, the upper nozzle 16 is provided. However, the upper nozzle 16 is not necessarily provided. For example, heating of the upper surface is not required to prevent foaming and surface roughness.
When heating only the lower surface of the web W, only the lower nozzle 14 may be used.

When the upper nozzle is provided, the type thereof is not limited to the upper nozzle 16 in the above embodiment. For example,
A nozzle for flowing hot air along the upper surface of the web W from the rear to the front of the trunk chamber 12 may be used.

[0039]

As described above, according to the web heat treatment apparatus of the present invention, the vibration of the web can be prevented by the rectifying effect of the stabilizer and the supporting force of the web can be improved by the pressing effect of the stabilizer. In addition, the running property of the web is stabilized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heat treatment apparatus showing one embodiment of the present invention.

FIG. 2A is a longitudinal sectional view of a lower nozzle, and FIG. 2B is a graph showing a pressure between a web and a lower nozzle.

FIG. 3 is a plan view of a lower nozzle.

FIG. 4 is a vertical sectional view of a nozzle in a conventional heat treatment apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heat treatment apparatus 14 Lower nozzle 36 Outlet 40 Fin 42 Stabilizer 44 Gap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-41392 (JP, A) JP-A-2000-230782 (JP, A) JP-A-7-294123 (JP, A) (JP, U) US Patent 5,370,289 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F26B 13/20 F26B 13/10 F26B 21/00 B65H 20/10 B65H 20/14

Claims (2)

(57) [Claims] 1. A heat treatment apparatus in which a plurality of nozzles for blowing hot air from a lower surface of a web running in a front-rear direction are arranged in a front-rear direction, wherein the nozzles blow hot air obliquely rearward, and fins extending rearward from the nozzles. And a stabilizer disposed behind the fin, wherein a front end of the stabilizer is positioned below a rear end of the fin, and a front end of the stabilizer and a rear end of the fin are provided. A heat treatment apparatus for a web, characterized in that a gap is formed in the stabilizing plate, and the stabilizing plate is inclined so that the rear end of the stabilizing plate is substantially the same as or slightly higher than its front end. 2. A web heat treatment apparatus according to claim 1, wherein a plurality of nozzles for blowing hot air onto the upper surface of the web are arranged in the front-rear direction.