JPH07109059B2 - Thread drying method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an object to provide a yarn drying method capable of favorably drying a yarn of a wound yarn body.

[0002]

2. Description of the Related Art Conventionally, a wound thread body in which a thread is wound in a tubular shape is fixedly fixed to a bottom of a dyeing pot filled with a dyeing liquid, and a dyeing liquid introducing pipe and a dyeing liquid leading out to the bottom of the dyeing liquid. A cheese dyeing method has been proposed in which pipes are connected in series and a dyeing solution is circulated by a circulation pump to dye the thread of a wound thread body.

The yarn dyed by this cheese dyeing method is
After dyeing, it is dried.

In this drying process, a tubular body having a small hole through which hot air is drawn in and out is erected in a container, the dyed wound yarn body is fitted on the tubular body, and the small hole is formed. Warm air is drawn in and out to dry the wound thread.

More specifically, pressurized hot air is introduced into the small holes for dehydration and drying, or pressurized hot air is drawn out from the small holes for drying. That is, the pressurized hot air is appropriately switched to dry the yarn.

[0006]

However, in the above-mentioned conventional drying method, in order to satisfactorily perform the drying, the only consideration is that a large amount of high-pressure hot air is introduced into and drawn out from the wound yarn body for a long time. .

[0007] The applicant conducted various studies and, as a result of repeating experiments, confirmed that a large amount of high-pressure hot air was not dried in and out of the wound yarn body, but was rather dried. .

That is, when a large amount of high-pressure hot air is introduced and drawn into the wound yarn body, a gap (thread line) is formed between the wound yarns, and the warm air preferentially leaks from the gap. Therefore, it is impossible to dry the wound thread evenly, and if warm air is supplied for a long time to completely dry the thread, the thread will change color and the shape of the wound thread will be distorted. On the contrary, it was confirmed that good drying was not performed.

The present invention pays attention to the pressure difference between the inside and outside of the wound yarn body that no one has noticed so far, and the yarn that can be dried well by controlling the warm air by the pressure difference. It is a technical object to provide a drying method.

[0010]

The gist of the present invention will be described with reference to the accompanying drawings.

[0011] A yarn drying method in which warm air is drawn in and out from the inside and outside of a wound yarn body 1 formed by winding a yarn in a tubular shape to dry the yarn. The present invention relates to a yarn drying method, characterized in that a yarn of a wound yarn body is dried by controlling a pressure difference between the warm air pressure and the warm air pressure outside the wound yarn body.

[0012]

The heated yarn of the wound yarn body 1 is dried well by the hot compressed air which is controlled in consideration of the pressure difference between the inside and outside of the wound yarn body 1.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings are explanatory views showing an embodiment of the present invention.
This will be described below.

Reference numeral 1 is a wound thread body in which an appropriate thread is wound,
2 is a container, 3 is a tubular member having a small hole 4 into which the wound thread 1 is fitted, 5 is a warm air storage part, 6 is a pressure gauge, 7 is a compressor, 8 is a blower, 9 is a heater, 10 Is a cooling part, 11 is a drain part, 12 is a solenoid valve, 13 is a flow path switching part, 14 and 15 are ports, and 16 is a temperature difference meter.

Since this embodiment has the above-mentioned structure, it has the following operational effects. The following flow of pressurized hot air is performed in consideration of the pressure difference between the inside and outside of the wound yarn body 1.

First, the wound thread body 1 is fitted and mounted on the tubular member 3. Then, the blower 8 and the heater 9 are operated, and then the compressor 7 is operated. Then, the flow path switching unit 13
Is activated to introduce pressurized hot air into the container 2 through the port 15. The pressurized hot air is introduced into the tubular member 3 through the small holes 4 while removing the water content of the yarn of the wound yarn body 1, and is cooled through the port 14 to the cooling unit.
After passing through 10, it is introduced into the blower 8 and circulated.

Subsequently, when the flow path switching unit 13 is operated, the pressurized hot air is introduced into the tubular member 3 through the port 14, and the wound yarn body 1
From the inner side to the outer side, is introduced into the cooling section 10 through the port 15, is again introduced into the blower 8, and is circulated.

As described above, a gap is formed between the yarns of the wound yarn body 1 by allowing the hot compressed air to pass through the inside and outside of the wound yarn body 1 while considering the pressure difference between the inside and outside of the wound yarn body 1. In addition, the yarn is not deformed and the yarn is dried well.

As a result of the experiment, when 200 wound yarns 1 (1000 g of yarn amount) wound with wool yarn were set in the tubular member 3 and the above drying operation was performed, the inside and outside of the wound yarn 1 Differential pressure of 0.1 to 0.4 kg / cm ² (body pressure of 2.5 to 3.0 k
It was confirmed that all the wound yarn bodies 1 could be dried well by keeping warm air (g / cm ² ) for about 40 minutes (the same applies to rayon yarn and acrylic yarn).

In this embodiment, the operation of the compressor 7 is controlled by a solenoid valve.
A configuration that controls the blower 8 based on the power consumption of the blower 8 is adopted. A means for controlling the compressor 7 based on the pressure in the container 2 can be considered, for example, a means for operating the blower 8 when the pressure in the container 2 reaches 5 kg / cm ² , for example. Multiple pressure switches are required, and it becomes complicated and puts an unnecessary load on the blower 8. (Because a peak current flows when the blower 8 starts up, the blower 8 is operated with as little load as possible. It is desirable to let.)
At the same time, the warm air is suddenly drawn in and out of the wound yarn body 1, so that a gap is generated between the yarns as described above.

As in this embodiment, a means for operating the blower 8 at the same time as the operation of the compressor 7 and controlling the compressor 7 based on the power consumption of the blower 8 is adopted to apply a load to the blower 8 as much as possible. If this is not done, the above problems can be avoided.

The reason why the compressor 7 can be controlled by the power consumption of the blower 8 is that the power consumption of the blower 8 and the pressure in the container 2 are in a proportional relationship.

The present embodiment also has the following features.

Temperature of Ports 14 and 15 A. When the temperature difference of B becomes small, the drying of the wound yarn body 1 is completed.

If the difference between the temperature B of the port 15 and the temperature C at the outlet of the cooling unit 10 is large, the water content is removed by the cooling unit 10 to that extent.

Therefore, it is most desirable to raise the temperature at the point B as much as possible in order to obtain a large amount of water in the cooling section 10.

Therefore, it is most desirable to raise the temperature of the point B by raising the temperature of the point A so that the water removing action in the cooling section 10 can be improved.

In this embodiment, until the temperature difference between the points A and B reaches about 20 ° C., the temperature at the point A, that is, the warm air temperature is set to be high so that the water removing action in the cooling section 10 is performed. Activate
When the temperature difference between the points A and B is less than about 20 ° C, the temperature of the warm air is lowered to the heat resistant temperature of the yarn.

Conventionally, for example, the heat resistant temperature of the yarn is 100 ° C.
In that case, the control method of setting the warm air to 100 ° C. was adopted, but according to the present embodiment, the temperature of the warm air can be raised as much as possible because of the control method described above.
In particular, the initial warm air temperature can be increased, and the shortening of the drying time can be achieved accordingly.

In this embodiment, since the heater 9 is controlled from this point of view, the temperature difference meter 16 monitors the yarn so that the yarn can be dehydrated satisfactorily. Therefore, the wound yarn body 1 can be dried well. Moreover, the end of the completion of the drying can be easily confirmed by the temperature difference between the points A and B.

Further, this embodiment has the following features.

The cooling water introduced to cool the warm air in the cooling unit 10 is constructed so that its amount can be varied.

When the temperature difference between the hot air introduced into the cooling section 10 and the hot air drawn out from the cooling section 10 exceeds a predetermined temperature T (about 40 ° C.), a saturated state is reached and drainage cannot be achieved. In this state, no matter how much the cooling water is supplied, the water removing action corresponding to the amount of the supplied cooling water is not performed.

In this embodiment, when the difference between the temperature of the introduced hot air and the temperature of the derived hot air exceeds the temperature T, the cooling water supply amount is controlled to be reduced. Therefore, the waste of cooling water can be saved and the so-called energy saving effect can be exhibited.

[0035]

As described above, the present invention provides a yarn drying method capable of favorably drying the yarn of the wound yarn body.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the present embodiment.

[Explanation of symbols]

 1 wound thread

Claims (1)

[Claims] 1. A yarn drying method in which warm air is drawn in and out from inside and outside of a wound yarn body formed by winding a yarn in a tubular shape to dry the yarn, and the inside of the wound yarn body at the warm air pressure. A method for drying a yarn, characterized in that the yarn of the wound yarn is dried by controlling the differential pressure between the warm air pressure of the wound yarn and the warm air pressure outside the wound yarn.