JPS60253498A - Washing method of drycleaning - 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 (Industrial Field of Application) The present invention is applicable to dry cleaning machines that clean clothes, etc. using organic solvents such as perchloroethylene, 1.1.1) lychloroethane, and R113. The present invention relates to a cleaning method.

(Prior Art) A conventional dry cleaning process will be outlined using FIG. First, the clothing 2 is put in through the door 1, and the door 1 is closed to start operation. Generally, the steps proceed in the following order.

(2) The solvent 4 is pumped up from the solvent tank 3 through the valve 5 by the pump 6, and the required amount of the solvent 4 is sent into the processing tank 10 through the path consisting of the valve 7 and the filter 8 or the path consisting of the valve 9.

■, Slowly rotate the processing drum 11 and pour the solvent 4 into the processing tank 1.
0, button trap 12, valve 13, pump 6, valve 7, filter 8, or valve 9.

(3) The liquid is drained through the processing tank 101, button trap 12, valve 13, pump 6, valve 14, and distiller 15, and then the processing drum 11 rotates at high speed to centrifugally separate the solvent 4 in the clothing 2. Drain the fluid.

■Repeat the steps in sections ■ and ■ above.

(3) The liquid is drained into the solvent tank 3 through the path of the processing tank 10, button trap 12, valve 13, and valve 5, and then the processing drum 11 rotates at high speed to centrifuge the solvent 4 in the clothing 2 and drain it. .

■Slowly rotate the processing drum 11 again, and the fan 16,
Air is circulated in the direction of arrow 20 between a recovery air duct 19 consisting of an air cooler 17 and an air heater 18 and a processing tank 10 to dry the clothes 2. The solvent gas evaporated from the clothing 2 is condensed in the air cooler 17, enters the water separator 22 through the recovery path 21, and enters the Tallinn tank 24 through the solvent pipe 23.

(2) When drying is completed, the dampers 25 and 26 open as shown by the broken lines, and fresh air is taken in from the damper 25, and uncondensed solvent gas that cannot be recovered by the air cooler 17 is exhausted from the damper 26, eliminating the solvent odor in the clothing 2. Deodorize.

The solvent 4 that entered the distiller 15 in the process of (2) and (2) evaporates and is condensed and recovered in the condenser 27, passes through the water separator 22 and solvent piping 23, enters the Tallinn tank 24, and flows from the overflow partition plate 28. , return to solvent tank 3.

Note that the water separated by the water separator 22 is discharged to the outside of the system through a water pipe 29.

Dry cleaning uses organic solvents, which by their nature, dissolve fats and exhibit excellent cleaning power, but they also remove salt, which is one of the main components of sweat, and other water-soluble stains. Almost no cleaning effect can be expected. For this reason, a small amount of cleaning aid (surfactant) is usually added. This cleaning aid has the ability to solubilize water.
By adding this, a small amount of water is dissolved in the solvent to remove hydrophilic stains.

However, the ability of cleaning aids to solubilize water is limited, limiting the amount of water that can be added to the solvent. By the way, cleaning aids are usually added in an amount of 0.5 to 1% by volume based on the amount of solvent, but in this case,
Water can be dissolved at most 0.1 to 0.2% by volume.

For this reason, conventional methods cannot sufficiently remove water-soluble stains, and at present, it is unavoidable to perform stain removal through pre-treatment and post-treatment, or to use water washing in combination.

As a technique for removing water-soluble stains using a solvent, emulsion cleaning is known, in which a large amount of water and a special cleaning agent are added to perchlorethylene, and the emulsified liquid is cleaned. Work clothes made of polyester blends, etc.
It is limited to cleaning uniforms) and cannot be applied to wool products, which are the main target of dry cleaning, due to its shrinking effect (effect that causes the cloth to shrink significantly).

Also, as a recent technology, high concentration (5 to 10 times normal)
Spray a small amount (usually 1/2 to 1/10 of the amount of cleaning bath liquid) of a dry cleaning solvent with a detergent dissolved therein onto the clothing, then use a solvent that does not contain a large amount of detergent (or contains a small amount of detergent). However, in practical terms, it is difficult to spray the detergent evenly (especially at high loads), and there are other problems such as not enough detergent being sprayed on areas where water-soluble stains exist. was there.

(Problems to be Solved by the Invention) The present invention has been proposed in order to eliminate the above-mentioned conventional drawbacks, and aims to provide a method for dry cleaning that can fully utilize the characteristics of a highly concentrated solvent. This is the purpose.

(Means for Solving the Problems) In order to achieve this object, the present invention provides a cleaning method for dry cleaning using a high concentration solvent, in which cleaning treatment is first performed using a normal concentration solvent, and then cleaning treatment is performed using a high concentration solvent. It has a configuration that allows it to perform the following.

(Function) In this configuration, the normal concentration solvent is first sent from the solvent tank to the processing tank, circulated through the circuit including the processing tank, washed the clothes, and then drained, and then the high concentration solvent is sent to the high concentration solvent tank. The liquid is pumped into a processing tank, circulates through a circuit that includes the processing tank, washes clothing, and then drains.

(Example) An example of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the configuration of an apparatus for carrying out the method of the present invention. The difference in Fig. 1 from the conventional Fig. 2 is that the solvent tank 3 (second
) is divided into two, a normal concentration solvent tank 3a and a high concentration solvent tank 3b, and each tank has its own valve 5.
The only difference is that a and 5b are attached, and the other configuration is completely the same as the second one.
These other configurations will not be described here because they are similar to the figures.

Next, the functions of the embodiment configured as above will be explained in the order of pre-washing, high-concentration solvent cleaning, and rinsing. [Pre-washing]
A necessary amount of the solvent 4a is pumped up by a pump 6 and sent into the processing tank 10 through a path consisting of a valve 7 and a filter 8 or a path consisting of a valve 9.

(2) The processing drum 11 is rotated slowly, and the clothing 2 is washed by circulating the solvent 4a through a circuit consisting of the processing tank 10, button trap 12, valve 13, pump 6, valve 7, filter 8, or valve 9.

(2) The liquid is drained through the processing tank 10, button trap 12, valve 13, pump 6, valve 14, and distiller 15, and then the processing drum 11 rotates at high speed to remove the solvent 4a in the clothing 2.
Centrifuge and drain.

[High concentration solvent cleaning]

(2) The high-concentration solvent 4b is pumped up from the high-concentration solvent tank 3 through the valve 5b with the pump 6, and the required amount of the high-concentration solvent 4b is sent into the processing tank 10 through the path consisting of the valve 9.

(2) The processing drum 11 is rotated slowly, and the highly concentrated solvent 4b is circulated through a circuit consisting of the processing tank 10, the button trap 12, the valve 13, the pump 6, the valve 7, the filter 8, or the valve 9 to wash the clothing 2.

■ After draining a part of the highly concentrated solvent 4b to the distiller 15 through the path of the treatment tank 10, button trap 12, valve 13, pump 6, and valve 14, the path after the pulp 13 is switched to the path of the valve 5b. , the liquid is drained into the high-concentration solvent tank 3b (the processing drum 11 rotates at high speed midway through to centrifugally separate the high-concentration solvent 4b in the clothing 2).

〔rinse〕

(2) Repeat the steps in sections (2) and (2) above.

(2) Draining the solvent 4a into the solvent tank 3a through the treatment tank 10, button trap 12, valve 13, and valve 5a,
Subsequently, the processing drum 11 rotates at high speed to centrifugally separate the solvent 4a in the clothing 2 and drain it.

(2) The process proceeds in the same manner as from point 0 of the conventional process.

Now, in the steps 0 to 0 (pre-washing), oil-soluble stains and solid stains such as dirt, dust, etc. attached to and adsorbed on the clothing 2 are removed.

Next, in items 0 to 0 (high concentration solvent cleaning), the clothing 2 is immersed in the high concentration solvent 4b and at the same time mechanical force is applied by the rotation of the processing drum 11, so the high concentration solvent penetrates into the inside of the clothing 2. As a result, the water-soluble stain removal effect is maximized, and since pre-washing is performed, there is less accumulation of highly concentrated solvent stains. Finally, in step 0 (rinsing), the highly concentrated solvent in the clothing 2 is rinsed away, so the clothing 2 does not have any stickiness from detergent or the like after drying.

(Effects of the Invention) The present invention is configured as described above, and by incorporating cleaning with a high concentration solvent after the cleaning treatment with a normal concentration solvent, which is a standard cleaning method, it is possible to achieve a balance for all types of dirt. This allows for excellent dry cleaning.

Next, Table 1 shows a comparison of the method according to the present invention with the conventional method (solvent: verchlorethylene). The cleaning rates in Table 1 were calculated using the following formula using a water-soluble contaminated cloth commercially available from Cleaning Research Institute.

W. : Whiteness of contaminated cloth (white cloth) WI: Whiteness of contaminated cloth before washing W, : Whiteness of contaminated cloth after washing Spraying or charging a small amount of water into a highly concentrated solvent are well known methods for increasing cleaning effectiveness.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an apparatus for carrying out the method of the present invention, and FIG. 2 FI! J is a system diagram of a conventional dry cleaning machine. Explanation of main parts of the diagram 3a - Normal concentration solvent tank 3b - High concentration solvent tank 4a - Normal concentration solvent 4b - High concentration solvent 5a, 5b
-Valve 6-Pump 9--Pulp 10-Treatment tank 12-Button trap Patent applicant Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] 1. A dry cleaning method using a high concentration solvent, which comprises first performing a cleaning treatment using a normal concentration solvent, and then performing a cleaning treatment using a high concentration solvent.