Dewatering cleaning method, dewatering cleaning apparatus, and c

Details Dewatering cleaning method, dewatering cleaning apparatus, and c Dewatering cleaning method, dewatering cleaning apparatus, and c

1994-04-19

1998-07-21

Popovics, Robert

Cleaning and liquid contact with solids

Processes

Including application of electrical radiant or wave energy...

134 10, 134 13, 210649, 210748, 210765, 210791, 210800, 210805, 21050021, 2105021, 210506, 210777, 210749, B08B 312, B08B 704

Patent

active

057829837

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to a dewatering cleaning method and a dewatering cleaning apparatus capable of imparting increased stability that enhances the quality of cleaning and to a concentration type filter for use therein


BACKGROUND OF THE INVENTION

Heretofore, it has been a common practice to use a fluorinated hydrocarbon (Flon) type solvent, a chlorine type solvent, or the vapor thereof for washing various parts which are smeared with oil-soluble dirt or water-soluble dirt. In recent years, however, such detergents as the Flon type solvent mentioned above have been arousing serious public anxiety about the effects they produce on human bodies and the environment. Thus, the desirability of a washing method which is capable of superprecision washing comparable favorably with that obtainable with the Flon type solvent without adversely affecting the environment has been finding enthusiastic recognition.
As detergents useful as substitutes for the Flon type solvent, therefore, various aqueous and nonaqueous substitute detergents such as, for example, aqueous detergents and organic solvent type chlorine-free detergents have been proposed. The feasibility of washing with these detergents has been being studied. Particularly the combination of the aqueous washing among other types of washing with a suitable water-treating device has a bright prospect of popular acceptance because it exerts very little adverse effect on the environment.
Since most of the substitute detergents mentioned above require a step of rinsing to follow the step of washing, the washing operation using such a substitute detergent generally follows the practice of giving a rinse with water to a washed part. After the rinse with water has been carried out, the water adhering to the surface of the rinsed part must be uniformly and quickly dried for the sake of quality of the washing. By the currently prevailing method of forcibly vaporizing water such as is effected with hot air, however, it is very difficult to prevent the occurrence of watermarks on the dried surface of the part. Besides, the vapor washing which uses such a low boiling organic solvent as isopropyl alcohol (hereinafter referred to as "IPA") has been in vogue. When a part still wet with adhering water is directly subjected to the vapor washing, however, it is very difficult to preclude the occurrence of watermarks as in the case of drying with hot air.
For the purpose of solving the problem described above, the feasibility of the cleaning by displacement of water (dewatering cleaning) using a dewatering cleaning agent has been studied. The dewatering cleaning agent is a nonFlon detergent which has an ability to displace water, exhibits no compatibility with water, and avoids boiling at the temperature prevalent in current of drying. Specifically, the dewatering cleaning comprises immersing the part wet with adhering water in the dewatering cleaning agent, causing the adhering water to be displaced by the cleaning agent, and then drying the dewatering cleaning agent. By the dewatering cleaning which is performed as described above, such adverse results of the rinsing operation such as watermarks can be prevented. The method of cleaning which combines a degreasing treatment inclusive of water washing with the dewatering cleaning, therefore, is expected to serve as a method of cleaning capable of taking the place of the washing by the use of a Flon type detergent. Heretofore, a Flon type solvent which contains a small amount of surfactant has often been used in the rinse washing. Continuous efforts made to develop various practicable dewatering cleaning agents capable of taking the place of such Flon type solvents as mentioned above.
When the washed part, which is still wet with adhering water, is subjected to the dewatering cleaning by the use of such a non-Flon type dewatering cleaning agent as described above, the water which is consequently removed from the washed part is naturally destined to mingle with the dewatering cleaning agent. For the sake

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