JPH0791830A - Heat treatment device for web - Google Patents

Abstract

PURPOSE:To shorten the heat treatment time of a web by a method wherein hot air is blown immediately downward from an upper nozzle and hot air is blown upward obliquely from a lower nozzle with a blowing speed higher than the same from the upper nozzle to keep balance while equalizing air pressure in an upper part and a lower part. CONSTITUTION:When the heat treatment of a web W, in which coating liquid is applied on only the upper surface thereof, is effected, the web W is ran while maintaining it on a supporting roll 40 under substantially horizontal condition. Air is sent from a fan 18 to supply hot air into an upper chamber 26 and a lower chamber 28 while the hot air is blown against the coating surface of the web W after decelerating the hot air, blown immediately downward from the upper nozzle 30 through the upper chamber 26. On the other hand, hot air, blown from the lower nozzle 36 through the lower chamber 28, is blown against the lower surface of the web obliquely without decreasing the speed of air. The hot air, blown against the lower surface of the web W, is blown obliquely in the angle thereof whereby air pressure is dropped to a pressure same as the pressure of air from the upper nozzle 30 since the angle is oblique whereby the balance of the web W can be kept.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web heat treatment apparatus.

[0002]

2. Description of the Related Art Various heat treatment apparatuses have been proposed in the past for applying a coating solution to only one side of a web such as a woven fabric, a knitted fabric or a film and drying the web. For example, a running web is supported by a support roll, and a device for drying by applying hot air vertically from the nozzle to the upper surface of the web coated with the coating liquid, or from the nozzle with the web floating in a loop shape. There is also an apparatus that blows hot air onto the web to perform heat treatment.

[0003]

In a web coated on only one side, the maximum wind speed at which hot air is blown onto the coated surface is naturally determined from the quality of the web. However, there is no such restriction on the uncoated surface.

However, if the wind speed of the uncoated surface is made higher than that of the coated surface in order to accelerate the drying, the web is pushed up toward the coated surface and comes into contact with the nozzle in the trunk chamber or the coated surface is disturbed. There was a problem that the product value was lost.

Therefore, even if the surface is uncoated, the wind speed must be the same as that of the coated surface, and there is a problem that the drying time cannot be shortened.

Therefore, in view of the above problems, the present invention provides a web heat treatment apparatus which can shorten the drying time and perform heat treatment with high efficiency.

[0007]

A heat treatment apparatus for a web according to claim 1 of the present invention is a heat treatment apparatus for applying heat air to a web traveling in a trunk chamber to perform heat treatment, the web traveling path of the trunk chamber being provided. Support rolls that are provided below at a required interval to support the traveling web, and provided at a required interval above the web traveling path of the trunk chamber to vertically direct hot air in the width direction of the traveling web upper surface. An upper nozzle that blows out and a lower portion that is provided below the running path of the web in the trunk chamber at required intervals and that blows hot air diagonally in the width direction of the lower surface of the running eve and faster than the wind speed from the upper nozzle. It consists of a nozzle.

According to a second aspect of the present invention, in the heat treatment apparatus for a web according to the first aspect, the blowout port at the tip of the lower nozzle is rotatably formed and hot air is blown in the width direction of the lower surface of the running web. The angle can be adjusted.

[0009]

[Operation] In the web heat treatment apparatus according to claim 1,
Hot air is vertically blown from the upper nozzle onto the upper surface of the moving web to perform heat treatment.

The lower surface of the traveling web is blown with hot air from the lower nozzle. In this case, since the hot air from the lower nozzle is blown obliquely, even if it is faster than the wind speed from the upper nozzle, the wind speed drops only at the part of the oblique angle, and the wind pressure from the upper nozzle is substantially Will be the same as Therefore, the web is not pushed up. Further, the hot air hitting the lower surface of the web flows along this lower surface. This wind speed is the same as the wind speed when blown out from the lower nozzle, is faster than the wind speed on the upper surface, and has a higher thermal conductivity than the upper surface. Therefore, heat from the lower surface of the web is transferred to the upper surface of the web, and the heat treatment is accelerated. That is, the wind speed is blown out faster than the upper nozzle, but since it is blown at an angle, it can be blown faster than the wind speed of the upper nozzle, resulting in higher thermal conductivity and shorter drying time.

According to the second aspect of the present invention, the heat treatment apparatus for a web is processed because the outlet at the tip of the lower nozzle can be freely rotated to adjust the angle at which the hot air is blown in the width direction of the lower surface of the web. The angle can be adjusted by the material, thickness, strength, etc. of the web.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat treatment apparatus 10 for a web W according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 12 is a trunk chamber for heat-treating the web W. An entrance 14 for the web W is provided on the front surface of the trunk 12 and an exit 16 is provided on the rear surface thereof. The trunk chamber 12 is surrounded by a heat insulating plate and has a heat insulating structure.

Reference numeral 18 is a blower for circulating hot air inside the trunk chamber 12. The blower 18 sucks air from its lower surface and blows it out from the side.

Reference numeral 20 is a filter connected to the blower port of the blower 18.

Reference numeral 22 is a heat exchanger connected to the filter 20. A burner is built in the inside thereof to heat the air sent from the blower 18.

Reference numeral 24 is a duct connected to the heat exchanger 22. The duct 24 is provided along the ceiling surface of the trunk compartment 12, and is bent downward at its front portion to extend to the bottom surface of the trunk compartment 12.

Reference numeral 26 is an upper chamber provided above the traveling path of the web W. This upper chamber 2
The front part of 6 is connected to the duct 24 and is supplied with hot air.

Reference numeral 28 is a lower chamber provided below the traveling path of the web W. This lower chamber 2
The front part of 8 is connected to the duct 24 and is supplied with hot air.

Reference numeral 30 is an upper nozzle provided on the lower surface of the upper chamber 26 at required intervals in the width direction. The upper nozzle 30 is composed of an outer nozzle 32 having a triangular cross section that is narrower toward the lower end, and an inner nozzle 34 provided inside the outer nozzle 32. Then, the hot air blown from the lower end of the upper nozzle 30 causes the traveling web W to travel.
Hits the upper surface of the vertical.

Reference numeral 36 is a lower nozzle provided on the upper surface of the lower chamber 28 in the width direction at required intervals. The lower nozzle 36 is inclined toward the traveling direction of the web W and protrudes from the lower chamber 28, and an outlet 38 is provided at the tip thereof. The outlet 38 is rotatably provided at the tip of the lower nozzle 36, and the outlet angle can be adjusted.

Reference numeral 40 is a support roll provided below the traveling path of the web W at required intervals. The support roll 40 is passive and moves while supporting the web W in a substantially horizontal state. The detailed structure of the support roll 40 will be described with reference to FIGS. 3 and 4.

Reference numerals 42 and 42 are a pair of shafts, and both outer ends 43 and 43 thereof are connected to a fixed bearing 44 provided in the trunk chamber 12. Further, the inner surface of the inner end portion 46 is magnetized, and the outer ends 43, 43 are not magnetized.

Reference numeral 48 is a roll, and the tip end portions 46 of the shaft 42 are inserted into both sides of the roll so as to be rotatable. In addition, the inner peripheral surfaces 50 on both sides of the roll 48
Is magnetized, and repels the inner end portion 46 of the shaft 42 by magnetic force and does not contact each other.

Reference numerals 52 and 52 are collars provided on both sides of the roll 48. This collar is magnetized.

In the shaft 40 having the above-mentioned structure, the inner end portion 46 of the shaft 42 and the inner peripheral surface 50 of the roll 48 are magnetized to each other, so that they do not repel each other and come into contact with each other. 48 is rotatable with respect to the shaft 42. Therefore, even if the web W passes over the upper surface of the roll 48, the roll 48 rotates as it travels. Also, since the lubricating oil is not used inside the trunk chamber 12 where the heat treatment is performed, maintenance is not required and the quality is improved.

A case will be described in which the heat treatment apparatus 10 having the above-mentioned configuration is used to heat-treat the web W having the coating liquid applied to only one surface. The coating liquid is applied to the upper surface of the web W.

Web W from inlet 14 to outlet 16
Run. In this case, the web W has the support roll 40
Since it is supported by, it can run in a substantially horizontal state.

Air is blown from the blower 18 to supply hot air to the upper chamber 26 and the lower chamber 28. In this case, the wind speeds reaching the upper chamber 26 and the lower chamber 28 are the same.

Upper nozzle 30 through upper chamber 26
The hot air blown just below is blown onto the coated surface of the web W and heat-treated. In this case, since the upper nozzle 30 has a double structure of the outer nozzle 32 and the inner nozzle 34, the hot air once blown from the inner nozzle 34 spreads inside the outer nozzle 32, so that the wind speed thereof drops.

Lower nozzle 36 through lower chamber 28
The hot air blown from the web W does not decrease the wind speed.
And then flows along the lower surface of the web W. In this case, since the angle of contact with the lower surface of the web W is oblique, the wind pressure on the lower surface of the web W drops and becomes the same as the wind pressure of the upper nozzle 30, so that the balance is maintained. Therefore, the web W is not lifted by the hot air from the lower nozzle 36. Further, since the hot air hitting the lower surface of the web W flows along the lower surface of the web W while maintaining a high wind speed, the thermal conductivity is improved more than that of the upper surface. Therefore, heat is transferred from the lower surface and the drying of the coating liquid on the upper surface is promoted.

Since it is necessary to change the blowing angle from the lower nozzle depending on the material, thickness (weight) and strength of the web W, in this case, the blowing port 38 is rotated to change the blowing angle. Let

As described above, in the heat treatment apparatus 10 of this embodiment, the wind velocity from the upper nozzle 30 is reduced to dry the coated surface, but the wind velocity from the lower nozzle 36 is not reduced, so that the thermal conductivity is increased and the heat treatment is performed. Can be done faster.
Therefore, the drying time can be shortened as compared with the conventional heat treatment apparatus, and the operating time of the heat treatment apparatus can be shortened.

Although the lower nozzle 36 is inclined along the traveling direction of the web W in the above embodiment, instead of this,
The hot air may be blown toward the traveling direction of the web W by inclining in the opposite direction.

Further, the upper nozzle 30 has a double structure in order to change the wind velocities of the upper nozzle and the lower nozzle, but instead of this, the blower 18 is provided in each of the upper chamber 26 and the lower chamber 28, and the blowing velocity thereof is changed. You may make a difference.

[0036]

As described above, in the heat treatment apparatus for a web according to claim 1, hot air is blown directly below from the upper nozzle,
Since the lower nozzle is faster than the blowing speed from the upper nozzle and hits the lower surface of the web diagonally, the upper and lower wind pressures are the same and the balance is not pushed up and the web is not pushed up. The lower surface is larger and the heat treatment time can be shortened.

In the web heat treatment apparatus of the second aspect, since the angle of the blowout port can be changed, the blowing angle can be changed depending on the material, thickness and strength of the web.

[Brief description of drawings]

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

FIG. 2 is an enlarged vertical sectional view of an upper nozzle and a lower nozzle.

FIG. 3 is a vertical cross-sectional view of a support roll.

4 is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

 10 Heat Treatment Device 12 Trunk Chamber 30 Upper Nozzle 36 Lower Nozzle 38 Outlet 40 Support Roll

Claims (2)

[Claims] 1. A heat treatment apparatus for performing heat treatment by applying hot air to a traveling web in a trunk chamber, the supporting roll being provided below a web traveling path in the trunk chamber at required intervals and supporting the traveling web. And an upper nozzle that is provided above the web running path of the trunk chamber at required intervals and blows hot air vertically in the width direction of the running web upper surface, and a required interval below the web running path of the trunk chamber. A heat treatment apparatus for a web, comprising: a lower nozzle that is provided for each of the lower nozzles and that blows hot air obliquely in the width direction of the traveling lower surface of the web and faster than the wind speed from the upper nozzle. 2. The web according to claim 1, wherein a blowout port at the tip of the lower nozzle is rotatably formed, and the angle at which the hot air is applied in the width direction of the lower surface of the traveling web can be adjusted. Heat treatment equipment.