JPH0792333B2 - 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 performing heat treatment such as drying of webs such as cloth and sheets.

[0002]

2. Description of the Related Art Conventionally, there have been the following types of heat treatment apparatuses for webs.

That is, a plurality of nozzle boxes arranged along the width direction of the web above and below the passage of the continuously running web are provided along the running direction of the web with a required space for the air passage for the return air. They are individually distributed.

With this heat treatment apparatus, hot air is jetted from the plurality of nozzle boxes to the upper and lower surfaces of the web to perform heat treatment such as drying, and the return air from the heat-treated web is returned to the nozzle box. It has a structure in which it circulates by flowing in a return air passage provided between them.

In the heat treatment apparatus having the above-mentioned structure, since the return air flows well in the return air ventilation passage,
A current plate is arranged in the return air ventilation passage as shown in FIG. That is, the straightening vanes 110 are arranged only on both sides of the web W in the width direction so that the return air flows in the central portion of the web W in the width direction.
0 is not allocated.

[0006]

In the arrangement of the current plate as described above, when the weight of the web W is heavy,
The web W can be successfully heat treated.

However, when the weight of the web W is light, the return air flows in the same amount in the upward and downward directions, so that the central portion of the web W swells and vertical wrinkles occur. there were.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a web heat treatment apparatus in which vertical wrinkles or the like do not occur in the heat-treated web.

[0009]

SUMMARY OF THE INVENTION A heat treatment apparatus for a web according to the present invention comprises nozzle boxes arranged above and below a passage for a continuously running web in the width direction of the web for a ventilation passage for a return air. A plurality of nozzles are arranged along the traveling direction of the web with a required space between them, hot air is jetted from the plurality of nozzle boxes to the upper and lower surfaces of the traveling web to perform heat treatment such as drying, and the hot air jetted to the web. In a heat treatment apparatus for a web having a structure in which it flows into the ventilation passage for the return air, the straightening plate is provided over the entire width direction of the web in the ventilation passage for the return air between the nozzle boxes arranged above the passage for the web. The straightening vanes are provided only in the central portion in the width direction of the web in the return air ventilation passage between the nozzle boxes arranged below the passage of the web.

[0010]

[Operation] In the heat treatment apparatus for a web having the above structure, most of the return air from the web flows to the lower surface of the web. This is because the return air ventilation passage above the web is almost blocked by the flow straightening plate, so that the return air cannot flow upward.

The return air that has flowed to the lower surface of the web cannot flow to the central portion of the web in the width direction because the straightening vanes are provided in the central portion of the web in the width direction. Flow to. That is, the return air tends to flow to both sides downward. Therefore, the web is pressed from above, and the spreading effect is exerted in the width direction, which eliminates vertical wrinkles during traveling.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

Inside the heat treatment apparatus, a hot air circulation path 1 and a drying chamber 2 are formed by partitioning into upper and lower parts.
A fan 51 is provided on one side of the hot air circulation path 1, and a heater 52 is provided on the other side. A supply duct 44 extends downward from the fan 51 to supply hot air to the drying chamber 2 and from the drying chamber 2. The suction duct 54 extends upward, discharges the hot air supplied to the drying chamber 2 upward, and returns it to the circulation path 1 via the filter 55 arranged on the partition wall.

Inside the drying chamber 2, a large number of nozzle boxes 3 for injecting hot air and return air ventilation paths 6 for returning the injected hot air to the suction duct 54 are arranged in a matrix. That is, the nozzle box 3 provided along the width direction of the fabric 11 and the return air ventilation path 6
And are alternately arranged in the horizontal direction along the running direction of the fabric 11. The nozzle box 3 and the return air ventilation passage 6 are provided in a plurality of stages in the vertical direction.

Then, two upper and lower layers of conveyor nets 9 and 10 run between the nozzle boxes 3 which are vertically adjacent to each other. Although the conveyor nets 9 and 10 are shown by alternate long and short dash lines for convenience of illustration, the direction change rolls 15 to 23,
And 25 to 33, while changing the direction, the inside and outside of the drying chamber 2 are circulated from the top to the bottom by following different paths.

From the upper end of the drying chamber 2, a long fabric 11 enters the drying chamber 2 and is located between the conveyor nets 9 and 10 and runs together with these conveyor nets to move inside the drying chamber 2. It circulates and is discharged from the lower part of the other end to the outside of the drying chamber 2. When the fabric 11 travels in the drying chamber 2, hot air is jetted from the upper and lower nozzle boxes 3 onto the fabric 11, and the fabric 1
1 moves in a floating state.

In the heat treatment apparatus having the above structure, the flow of the hot air blown from the nozzle box 3 until it hits the fabric 11 and returns to the return air ventilation passage 6 will be described in detail with reference to FIG.

A ventilation passage for return air (hereinafter, upper ventilation passage 6a) provided between nozzle boxes 3 (hereinafter, referred to as upper nozzle box 3a) arranged above the fabric 11.
Say. ), The upper rectifying plate 100 is horizontally provided over the width direction of the fabric 11. A slight gap is provided between the upper straightening vanes 100.

The method of mounting the upper straightening vanes 100 is such that grooves are provided on both side walls of the adjacent upper nozzle boxes 3a and the upper straightening vanes 100 are inserted between the grooves. Therefore, the upper rectifying plate 100 can be freely moved along the width direction of the fabric 11 and can be inserted and removed freely.

A lower flow straightening plate 102 is also provided in the lower ventilation passage 6b provided between the lower nozzle boxes 3b which contact the lower surface of the fabric 11. The lower straightening vanes 102 are arranged only in the central portion of the fabric 11 in the width direction, and the lower straightening vanes 102 are not arranged so that return air flows on both sides thereof.

In the above structure, the upper and lower nozzles
The hot air blown from the boxes 3a and 3b hits the fabric 11.
It The return air, which is the hot air that hits,
The air flows into the space between the turn air ventilation passages 6a and 6b. This
The upper part of the space is almost blocked by the upper straightening plate 100
The lower center portion of this space is covered by the lower straightening vane 102.
Since most of the return air is
Fabric 1 without upper straightening plate 100 and lower straightening plate 102
It flows into both sides of the lower surface of 1.

As a result, the cloth 11 floating between the conveyor nets 9 and 10 is shaped so as to be pressed from top to bottom, and return air flows on both sides of the lower surface, so that a spreading effect is obtained. Vertical wrinkles do not occur as in the past.

In particular, when the fabric 11 is lightly weighted, vertical wrinkles are likely to occur, but when the structure of this embodiment is used, vertical wrinkles do not occur, and such a fabric 11 is formed.
Is the most suitable as the heat treatment device.

[0024]

As described above, the heat treatment apparatus for a web according to the present invention has a structure in which both sides of the lower surface of the web are flowed by the straightening vanes arranged in the return air ventilation passage.
Since the web is pressed down from the top and a spreading effect is produced, vertical wrinkles do not occur on the web.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a heat treatment apparatus of this embodiment.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view of a heat treatment apparatus.

FIG. 4 is an enlarged explanatory view of a main part of a nozzle box.

FIG. 5 is an enlarged vertical sectional view of a main part of a nozzle box in a conventional heat treatment apparatus.

[Explanation of symbols]

 3 ... Nozzle box 3a ... Upper nozzle box 3b ... Lower nozzle box 6 ... Return air ventilation passage 6a ... Upper ventilation passage 6b ... Lower ventilation passage 11 ... Fabric 100 ... Upper straightening plate 102 ... Lower straightening plate

Claims (1)

[Claims] 1. A nozzle box arranged along the width direction of a web above and below a passage for a continuously running web.
A plurality of nozzles are arranged along the traveling direction of the web with a required interval for the ventilation passage for air, and hot air is blown from the plurality of nozzle boxes to the upper and lower surfaces of the traveling web to perform heat treatment such as drying. In a heat treatment apparatus for webs in which the hot air sprayed onto the web flows to the ventilation passage for the return air, the ventilation air passage for the return air located between the nozzle boxes located above the passage for the web is The straightening vanes were arranged all over the width direction, and the straightening vanes were arranged only in the central portion of the width direction of the web in the ventilation passage for the return air between the nozzle boxes arranged below the passage of the web. Characteristic web heat treatment equipment.