JPH04164498A - Dry cleaning method - Google Patents

Abstract

PURPOSE:To perform dry cleaning without damaging all sorts of clothing in the same manner as with CFC 113 by using perchloroethylene upon cooling below the room temperature. CONSTITUTION:A solvent tank 3 and a clean tank 24 are furnished, and thereto solvent cooling coils 50, 50a and cooling units 51, 51a mating therewith are attached. The solvent 4 and 4a in these solvent tank 3 and clean tank 24 is ket by a temp. controller at a specified temp. level, for example 10 deg.C. By the use of such a solvent 4, 4a kept for example at 10 deg.C to the washing process, dry cleaning can be performed using perchloroethylene, which might damage some delicate clothing as long as conventional technique is used, without damaging all sorts of clothing like washing of clothing using CFC 113.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a dry cleaning method using perchlorethylene at a temperature lower than room temperature as a cleaning solvent.

(Prior Art) A conventional dry cleaning process will be outlined using FIG. First, the clothing 2 is put in through the door 1, and when the door 1 is closed and the operation is started, the process generally proceeds 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. Clothes 2 are washed by circulating in a circuit consisting of valve 13, pump 6, valve 7, filter 8 or valve 9.

■ Processing tank 10. Button trap 12. Valve 13, pump 6, valve 14. The liquid is drained through the path of the distiller 15, and then the processing drum 11 rotates at high speed to centrifugally separate the solvent 4 in the clothing 2, and the liquid is drained in the same manner.

■ Repeat steps 0 and ■.

■ Processing tank 10. Button trap 12. The solvent 4 is centrifuged and drained through the path of valve 13 and valve 5.

■ Slowly rotate the processing drum 11 again and turn on the fan 16.
Air cooler 17. Air is circulated in the direction of arrow 20 between a recovery air duct 19 consisting of an air heater 18 and a processing tank 1° 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 clean tank 24 through the solvent pipe 23.

■ When drying is completed, the dampers 25 and 26 open as shown by the broken lines, 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, thereby deodorizing the solvent odor in the clothing 2. do.

The solvent 4 that entered the distiller 15 in the step of (2) is evaporated, condensed and recovered in the condenser 27, and then collected in the water separator 22. It enters the clean tank 24 through the solvent pipe 23 and returns to the solvent tank 3 through the overflow partition plate 28. Note that the water separated by the water separator 22 is discharged to the outside of the system through a water pipe 29.

(Problems to be Solved by the Invention) As mentioned above, we have outlined the general dry cleaning process using perchlorethylene solvent, etc., which replaces Freon 113, which has the problem of ozone tank destruction. So, the liquid temperature during cleaning is around 30°C on average, and when processing at this liquid temperature,
As shown in Figure 2, the residual rate of pigments in delicate fashion clothing, where pigments are adhesively printed on fabric, is around 50%, which can lead to clothing damage and customer complaints. It was treated with detergents such as turpentine (petroleum-based) or mild solvents.

The purpose of the present invention is to solve the clothing accidents caused by conventional perchlorethylene solvents, and to use perchlorethylene to dry all types of clothing without causing damage, similar to Freon 113, Turpentine, etc. The present invention aims to provide a cleaning method.

(Means for Solving the Problem) Therefore, the present invention is a dry cleaning method using perchlorethylene as a dry cleaning solvent, in which the perchlorethylene is cooled to below room temperature. It is intended as a means to solve problems.

(Function) By lowering the temperature of perchlorethylene to 10°C or less and using it for washing clothes, it can reduce the level of damage to pigments in pigment-printed fabrics, etc., which are easily affected by the cleaning power of the solvent used, and reduce oil formation. As a result of experiments, it was found that the cleaning efficiency of standard contaminated cloth (oil-soluble) is equivalent to that of Freon 113, and like Freon 113, it can be applied to all types of clothing.

(Embodiments) The present invention will be described below with reference to embodiments of the drawings. FIG. 1 shows an embodiment of the present invention. Incidentally, in FIG. 1, the main steps such as washing and drying are the same as those of the prior art described above using FIG. 4, so a detailed explanation of this point will be omitted here.

The difference between the dry cleaning machine of the embodiment shown in FIG. 1 of the present invention and that shown in FIG. 4 is that in FIG.
Although corresponding cooling units 51 and 51a are attached, this is not shown in FIG. and solvents 4 and 4 in the solvent tank 3 and the clean tank 24.
a is maintained at a predetermined temperature, for example 10oC, by a temperature controller not clearly shown in FIG. Therefore, in FIG. 1, for example, solvents 4 and 4 kept at 10°C
By using a in the cleaning process of items ■, ■, and item 0 explained in the prior art example, damage to some delicate clothing (damage to printed patterns, etc.) can be avoided using the conventional technology as shown in Figure 4. ) can be used to dry clean all types of clothing without damaging them, similar to washing clothes with Freon 113.

In addition, in the description of the above embodiments, the temperature of the perchlorethylene solvent may be lowered by 10°C or higher than 10°C, for example, 15°C. However, in this case, the influence on the degree of damage to clothing increases as shown in FIG. 2, and the range of clothing that can be washed without causing clothing damage is restricted.

Figure 2 shows the degree of damage to adhesive pigments in pigment-printed fabrics, which are extremely susceptible to solvent damage, expressed as pigment residual rates (%). ) shows the cleaning power of various solvents from the cleaning rate (%). And in all of these cases, if perchlorethylene is used at temperatures below 10°C, Freon 11
This clearly shows that the cleaning power can be suppressed to the same level as No. 3, and clearly shows the effectiveness and characteristics of the present invention.

(Effects of the Invention) As explained in detail above, in the present invention, when perchloroethylene is cooled to 10°C or less and used for washing clothes,
As with Freon-113, all clothing can be dry-cleaned without causing damage, and a dry-cleaning method can be provided as an alternative to clothing washing using Freon-113, which will be completely phased out in 2000 due to problems with ozone layer destruction. Note that the temperature dependence of the detergency of the solvent explained above is unique to perchloroethylene, and other dry cleaning solvents such as 1.1.1-)-lichloroethane are originally The cleaning power of CFC 113 is much stronger than that of perchlorethylene.
It is difficult to set temperature conditions that are similar to the above.

[Brief explanation of drawings]

Fig. 1 is a system diagram of a dry cleaner machine that carries out the method of the present invention, Fig. 2 is a diagram explaining the temperature dependence of perchlorethylene's detergency on pigment prints, and Fig. 3 is a diagram illustrating the temperature dependence of perchlorethylene's detergency on pigment prints. FIG. 4, an explanatory diagram showing the cleaning rate for standard contaminated cloth by the Japan Oil Chemical Industry Association, is a system diagram of a conventional dry cleaner machine. Explanation of the main parts of the diagram 2.--Clothing 3. Solvent tank 4.4a
- Solvent (perchlorethylene) 24 - Clean tank 50, 50a - Cooling coil 51.51a - Cooling unit patent Applicant Mitsubishi Heavy Industries, Ltd. Fig. 1 5 Cleaning liquid temperature 0C 2 Fig. S: 5 Pigment area before cleaning

Claims (1)

[Claims] A dry cleaning method using perchlorethylene as a dry cleaning solvent, characterized in that perchlorethylene is used after being cooled to below room temperature.