JPS641580B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the cleaning tank is divided into a plurality of parts by an overflow plate, and in each of these parts at least one guide drum is immersed in sequence in the direction of movement of the woven fabric. The present invention relates to a method for washing lye from a woven fabric, in which the washing water of the washing tank is circulated to each part and returned to the parts above the guide drum. The invention also relates to a device for carrying out this method.

This type of method and device is covered by the German Utility Model No.
It is shown in specification No. 1893511. According to this,
Two guide drums are immersed in the wash water in each wash tank section, and upstream and downstream of these guide drums, the fabric is conveyed vertically over other guide drums in an elevated position. Wash water is returned to each wash tank section from a substantially horizontal spray jet which sprays the wash water inwardly and outwardly onto the vertical fabric. And the woven fabric is
At the outlet of each washing tank section, a pair of squeezing drums is passed.

However, this is particularly disadvantageous since, after the squeezing drum pair has squeezed out the wash water from the fabric, the fabric is passed through the air and absorbs the air at least partially. That is, the woven fabric is subsequently sprayed with the cleaning water returned in the next washing tank section and immersed in the washing water of this section, but since the woven fabric absorbs air downstream of the press drum pair, , it is not possible to completely replace the wash water. Furthermore, there is no guarantee that this air will be squeezed out again when the fabric is immersed in the wash water. Therefore, if it is attempted to wash out the washing water, a very large amount of clean water is required, the total length of the washing device becomes extremely long, and the cost increases.

On the other hand, U.S. Pat. No. 3,763,671 discloses a fabric with a cleaning tank divided into several parts by an overflow plate and a guide drum immersed within each of these parts and associated with an upper drum. A method for washing lye from cloth is shown. However, between these two upper drums and the guide drum a wash water sump is formed which contains the wash water that is circulated and returned from the top spray jet.
All the drums are configured as drums with ridges that mesh with the ridges of adjacent drums, so they cannot store cleaning water. In other words, the cleaning water supplied from the circulation system at the top flows down through the gaps between the ridges of the drum. In addition, due to the presence of these protrusions, it is impossible to squeeze the woven fabric at the pinching part.
This wasn't even intended. The protrusions of the drum are
It only serves the function of a wash water reservoir.

Moreover, East German Patent No. 63,454 describes a method for washing lye out of woven fabrics. According to this method, clean water is supplied to a washing tank divided into several parts and provided with a guide drum and an upper drum in such a way that the concentration gradient between the washing water and the fabric is substantially constant. Feed in the opposite direction to the woven fabric. In this case, the supply of clean water is regulated by a closed control system,
It is fed in a continuous and controlled quantity near the tank outlet. However, the control devices currently available on the market do not operate with the required accuracy in the flow range to be adjusted in this case and cannot meet all accuracy requirements.

It is therefore an object of the present invention to provide a method and a device of the above-mentioned type for washing lye from textile fabrics, with a good washing action and a significantly reduced water consumption.

According to the invention, this object is achieved by bringing two drums spaced apart from above into contact with each guide drum in such a way that a wash water reservoir is formed between these guide drums and the two upper drums. After the woven fabric is squeezed by the last one of the two pinching parts, which is formed between at least the guide drum and the upper drum behind it, the woven fabric is immediately drained of the washing water from the washing water reservoir. This is achieved by configuring it for full suction.

As a result, the woven fabric is immersed in the washing water in each washing tank section, then squeezed by the corresponding squeezing section, and immediately after that, in the squeezed state, the clean water supplied from the top is completely absorbed again. Can be absorbed into the air without inhaling air in advance. The novel method is therefore particularly suitable for mercerized textiles, with good cleaning action and minimal water consumption.

A similar purpose is to supply clean water to the washing tank in the direction opposite to the movement of the fabric so that the concentration gradient between the fabric and the washing water is substantially constant, and to clean the water at the outlet of the washing tank. This can also be achieved by supplying a variable base amount of water to the same tank and at the same time independently supplying a regulated clean water portion. Because of these measures,
All that needs to be adjusted is the amount of additional clean water, which is relatively small. This adjustment can be carried out with great precision even using commercially available control devices, so that the method can be carried out without compromising the quality of the cleaning process and with a minimum consumption of clean water.

Several designs and configurations of the closed control system are possible. First, the portion of clean water can be adjusted as a function of the lye deposited at the inlet.

The clean water fraction can also be adjusted as a function of the lye on the fabric at the outlet. That is, since the lye at the inlet of the cleaning tank no longer accumulates at a constant concentration, the amount of lye remaining on the fabric is adjusted. In this case, it is necessary, for example, to maintain a constant amount of residual lye in the fabric in order to avoid technical problems during subsequent steps in the treatment of the fabric.

In one specific embodiment, this can be achieved by constantly measuring the PH value of the lye downstream of the washing tank. However, the PH value may be measured in one cleaning tank at the rear. This takes advantage of the fact that the relationship between the fabric and lye in the washing water is constant. If the amount of lye in the washing water is measured in one washing tank at the rear, the amount of lye in the woven fabric can be calculated by subtraction.
Therefore, cleaning water may be added according to this measured value.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of a cleaning tank 1 with an open top, in which the fabric to be stabilized is passed from an inlet 2 to an outlet 4 in the direction of the arrow 3. As shown in FIG. 2, this cleaning tank 1 is divided into a plurality of sections 6 by overflow plates 5 in the left and right direction. Reference numeral 7 indicates a guide drum immersed in washing water in each of these parts 6, and 8 indicates a drum located above the guide drum 7 and in contact with the front and rear parts of the drum 7. The peripheral surfaces of all drums 7, 8 are smooth and preferably coated with rubber. In particular, FIG. 3 shows that a wash water reservoir is formed in the space between each guide drum 7 and the two drums 8.

An immersion plate can be provided in front of each guide drum 7 and each overflow plate (see FIG. 2) 5 that is immersed in the wash water and projects slightly upward. In that case,
The dip plate is slightly inclined towards the corresponding guide drum 7.

FIG. 3 shows in particular that the fabric passed through the device is squeezed in a pinch formed between the guide drum 7 and the two upper drums 8. After leaving the rear pinching section, this fabric is pumped out of this section 6 and sent via another circulation system to the spray jet 12.
The cleaning water that is returned to the above-mentioned section 6 is completely sucked in. For this purpose, the spray jet 12 is placed directly above each section 6, as shown in FIG.

The circulation system is constituted by a line 10, through which the wash water is conveyed by means of a pump 11 and, if necessary, an adjustable throttle.

In the closed control system shown in Figure 4, clean water is
The manual control device 13 supplies the basic quantity in the direction of the arrow 14 to the outlet 4. At the same time, a regulated portion of clean water is supplied to the cleaning tank 1 in the direction of the arrow 15 via the control valve 16 and the supply line 17.

In FIG. 4, the control valve 16 is connected to the control circuit 1.
8, and is operated by a sensor 19 which detects the amount of used lye discharged from the cleaning tank 1 and stored in the direction of the arrow 20. The conditioned portion of clean water is supplied to the cleaning tank 1 through a supply line 17 at a position approximately in the front third of the tank 1 .

However, the portion of the wash water may be adjusted as a function of the lye remaining on the fabric at the outlet, approximately at the location indicated by arrow 4 in FIG. The PH value of the lye can also be continuously measured downstream of the cleaning tank 1 or in a portion 6 at the rear of the tank 1. In this embodiment, the supply line 17 for the adjustment part of the clean water is connected to the rear part of the cleaning tank 1.
It is desirable to install it at point 3. What you need is
Considering the inertia of the control system, the distance between the measurement point and the flow rate adjustment point should be made as short as possible. This means that, as mentioned above, the supply line 17 is preferably located above the front third of the cleaning tank 1.
The same applies to the closed control system shown in the figure.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing the essential components of the device of the present invention, Fig. 2 is an enlarged view showing a part of the washing tank in Fig. 1, and Fig. 3 is a diagram showing the circulation of lye in the washing tank portion. Similar explanatory diagram of Figure 2, Figure 4 is the same as Figure 1.
FIG. 3 is a schematic diagram showing adjustment of the supply of clean water in the cleaning tank shown in the figure. 1...Cleaning tank, 2...Inlet, 4...Outlet, 5...
... Overflow plate, 6 ... Washing tank part, 7 ... Guide drum, 8 ... Drum, 12 ... Spray jet, 10
... Line, 11 ... Pump, 13 ... Manual control device, 16 ... Control valve, 17 ... Supply line, 1
8...control circuit, 19...sensor.

Claims (1)

[Scope of Claims] 1. The cleaning tank 1 is divided into a plurality of sections 6 by an overflow plate 5, and at least one guide drum 7 is provided in each section 6, and the woven fabric is sequentially immersed in the direction of movement of the woven fabric. The cleaning water in the cleaning tank 1 is circulated to each section 6, and the section 6 is disposed above the guide drum 7.
In this method, two separated drums 8, 8 are placed from above for each guide drum 7, and a washing water reservoir is placed between the guide drums 7 and both drums 8, 8. After the woven fabric is squeezed by the last pinching part formed between at least the guide drum 7 and the rear drum 8 among the two pinching parts, A method characterized in that the cleaning liquid in the cleaning water reservoir is completely sucked in immediately. 2. Clean water is supplied to the cleaning tank 1 in the opposite direction to the movement of the woven fabric so that the concentration gradient between the woven fabric and the cleaning water is substantially constant, and the clean water is discharged at the outlet of the cleaning tank 1. 2. A method according to claim 1, characterized in that a variable base quantity is supplied to the tank 1 and, at the same time, a regulated clean water portion is supplied independently. 3. Method according to claim 2, characterized in that the portion of clean water is adjusted as a function of the used wash water that accumulates at the inlet. 4. characterized in that said portion of clean water is adjusted as a function of the wash water on the fabric at the outlet,
A method according to claim 2. 5. Claim 4, characterized in that downstream of the cleaning tank 1, the PH value of the cleaning water is continuously measured.
The method described in section. 6. The method according to claim 4, characterized in that the PH value of the cleaning water is measured inside any of the rear parts 6 of the cleaning tank 1. 7. The cleaning tank 1 is divided into a plurality of parts 6 by the overflow plate 5, and a plurality of guide drums 7 are sequentially immersed in the cleaning tank 1, and front and rear drums are arranged above the guide drum 7 in relation to each guide drum 7. 8, 8, and a wash water circulation system comprising a circulation pump 11 and a spray jet 12 is associated with each said section 6 independently of one another above the guide drum 7, and is connected to the associated guide drum 7 and drum 8. A device for washing lye from woven fabrics, characterized in that a smooth drum jacket is provided between which a wash basin is formed.