JPS60142186A - Method of drying web - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Regarding the law.

1 to 6 show an example of a conventional web drying system, in which a plurality of steam heating drying devices (b) are provided along the line of the web (α) to be dried. Each steam heating drying device (A) uses saturated steam (c) from a boiler (not shown).
The steam heater is equipped with a steam heater (approximately 170°C) that introduces the temperature (approximately 170°C) through the main steam pipe (LL) and the branch steam pipe (C), and the air inside the equipment body (!I) is It is heated by exchanging heat with saturated steam, and the heated air is circulated through the fan/
(n) The upper head (
The web (
High temperature air is blown onto both sides of a) to dry it.

A portion of the air that still has moisture and has a reduced temperature inside each steam heating dryer (b) is removed from the exhaust pipe (and exhaust fan).

Furthermore, since the conventional method described above is equipped with a steam heater J), a pipe (n) is used to collect the condensate accumulated in the steam heater σ), and a drain tank ( O), cooler gloss), drain pump (q),
It is equipped with a drainage device (S) consisting of a valve (r) and the like. In addition, the drying air branch steam pipes (C
) The air which has dropped to around 115°C due to drying is heated to around 150°C by the steam heater (2). We are trying to supply it in circulation.

However, the conventional method described above has various problems as follows.

(b) In order to raise air at around 115°C to around 150°C using saturated steam (C) at a low temperature of around 170°C, a large amount of steam is required, which requires a main steam pipe (d) and a branch steam pipe. In addition to the increased diameter, each steam heating and drying device (b) requires a large steam heater (7), making the entire device bulky and expensive.

(B)-1 Installation is only possible in a place equipped with a boiler that can supply a large amount of saturated steam (C), and installing a new boiler for this purpose would be extremely expensive. Put it away.

(c) Since heat exchange is performed using the steam heater (a), energy loss is large, especially during startup.
In addition, when attempting to dry the web (α) in stages by gradually increasing the temperature of the circulating air in each steam heating drying device ψ), it was not possible to make a rapid temperature change, and fine temperature control was not possible. Have difficulty.

) Since the steam heater σ) is provided, a drainage device (s) is required, making the device complicated and expensive.

The present invention was made in view of these points, and is made by introducing high-temperature gas from a direct-fired unit heater into the mixing heating drying device installed in the web line and mixing it directly with the air inside the device. The purpose of the present invention is to simplify the apparatus, make it lighter and more economical, and improve temperature controllability by drying the web using the obtained dry air.

Embodiments of the present invention will be described below with reference to the drawings.

4 to 6 show an example of the present invention, in which a mixing heating drying device (2) is provided which divides a plurality of drying spaces along the line of the web (1) that requires drying. The mixing heating and drying device (2) uses high-temperature gas (4) (for example, 40
0°C), the main high temperature gas pipe (5) and the branch high temperature gas pipe (6
) to the inside of the device body (7),
The temperature decreases (approximately 115℃) due to internal drying.
) and has a mixing fan (9) for mixing with the air (8) which is
The dry air (g) held in the web (1) is guided through the duct αυ to the upper header (6) on the upper side of the web (1) and the lower header α■ on the lower side to dry the web (1). There is. In addition, a part of the dried air (8) whose temperature has decreased and is moist in each mixing heating and drying device (2) is exhausted through the branch pipe OQ, the main exhaust pipe (G), and the exhaust fan α power. I try to do that. At the time of B, the exhaust flow rate flowing through each branch pipe α0 is approximately the same as the amount of high temperature gas (4) introduced into each mixing heating drying device (2) via each branch high temperature gas pipe (6).
It is necessary to ensure that this is the case, but this can be adjusted using the exhaust valve α8) provided on each branch pipe (c). Still, temperature detectors α for detecting the temperature of the dry air (6) mixed by the mixing fan (9) are provided in the device main body (7), and each temperature detector α detects the temperature of the dry air (6) mixed by the mixing fan (9). A temperature regulator υ is provided to operate the high temperature gas adjustment valve provided on the branch high temperature gas pipe (6). In the figure, α→ indicates a connecting pipe that guides a part of the low-temperature air from the main exhaust pipe (A) as combustion air for the unit heater (3).

Next, the effect will be explained.

The high-temperature gas (4) at a temperature of, for example, 400°C generated by combustion in the direct-fired unit heater (3) is passed through the main high-temperature gas pipe (5) and the branch high-temperature gas pipe (6). is introduced into the device main body (7), and mixed with dry low temperature air (8) of, for example, 115°C by a mixing fan (9).
The web (1) is dried from both sides by being led to the upper and lower headers (A) and (2) through a duct αυ with dry air at 50°C. The low-temperature air (8) after drying is again guided to the mixing fan (9) for mixing, and a part of it is sent to the branch pipe (to), the main exhaust pipe (a), and the exhaust fan α.
8). Also at this time, the temperature sensor Q
The opening degree of the high temperature gas regulating valve (a) is adjusted by the detection signal from the temperature controller 12D so that the mixed dry air (tube) reaches the target temperature (for example, 150°C). Temperature regulated. At this time, dry air α0 is obtained by directly mixing the high temperature gas (4) with the low temperature air (8) using the mixing fan (9). The temperature of ◇・ can be changed, allowing fine temperature control. The high-temperature mixing heating and drying device (2) only needs to be equipped with a mixing fan (9) as the main equipment, so it can be simplified, smaller, and lighter, and the high-temperature gas (4) from the unit heater (3) can be Since it has a high temperature of 400° C., its flow rate can be reduced, and therefore the main hot gas pipe (5) and the branch hot gas pipe (6) can be made small in diameter.

It should be noted that the present invention is not limited to the above-described embodiments, and that various types of unit heaters can be adopted, and that the temperatures of high-temperature gas, dry air, and low-temperature air can be changed and set in various ways. Do not deviate from the gist of other car inventions.
Of course, various changes may be made within the scope of the invention.

According to the web drying method of the present invention described above, the following excellent effects can be achieved.

(1) The high-temperature gas from the direct-fired unit heater is guided into the space provided in the web line, where it is mixed directly with air to obtain dry air at the desired temperature. The device only needs to be equipped with a mixing fan as the main equipment, and the configuration can be made simple and lightweight.

(11) Since the temperature of the high-temperature gas can be raised freely by the unit heater, the supply amount can be reduced by supplying the high-temperature gas, and the diameter of the high-temperature gas pipe can therefore be reduced.

(iii) There is no need for a drainage device like the conventional system equipped with a steam heater.

(IV) The above (i), (ii), and (iii) can be implemented at extremely low cost.

(v) Since the unit heater can be freely selected in terms of capacity and combustion method, it is easy to apply and can be implemented at low cost.

(vl) The high-temperature gas generated by the unit heater is guided to a position close to the web line, where it is mixed directly with air to obtain dry air, so the amount of high-temperature gas supplied can be adjusted. This allows the temperature of the drying air to be changed immediately, making it possible to easily perform fine temperature control.

[Brief explanation of drawings]

Fig. 1 is an overall explanatory diagram showing an example of a conventional method, Fig. 2 is a cut side view showing details of the steam heating drying device section of Fig. 1,
6 is a cutaway front view of FIG. 2, FIG. 4 is an overall explanatory view showing one embodiment of the present invention, FIG. 5 is a cutaway side view showing details of the mixing heating drying device section of FIG. FIG. 6 is a cutaway front view of FIG. 5. (1) is the web, (2) is the mixing heating and drying device, (3) is the unit heater, (4) is the high temperature gas, (5) is the main high temperature gas pipe, (6) is the branch high temperature gas pipe, (7) is the device body, (
8) indicates low temperature air, (9) indicates a mixing fan, and θ·O indicates dry air. Figure 1 Inside the Shima factory

Claims (1)

[Claims] 1) High-temperature gas generated by direct combustion is supplied to each of a plurality of drying spaces divided along the line of the web, and the high-temperature gas is directly mixed with the air in the space to dry the required amount. A method for drying a web, comprising drying the web by introducing dry air at a temperature of .