JP2943998B2 - Rinse method for precision parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for rinsing precision parts.
More particularly, the present invention relates to a rinsing method in which a small amount of a rinsing liquid is used, thereby facilitating drainage treatment.

[0002]

2. Description of the Related Art
For removing dirt mainly on organic matter such as oils and fats, machine oil, cutting oil, grease, liquid crystal, and rosin-based flux, which exist on solid surfaces such as precision parts and jigs, use hydrocarbons such as kerosene, benzene, and xylene. Solvent-based detergents such as chlorine-based solvents such as trichloroethylene and tetrachloroethylene; and fluorocarbon-based solvents such as trichlorotrifluoroethane have been used.

[0003] However, it has been revealed that cleaning agents using chlorine-based and chlorofluorocarbon-based solvents have serious problems in safety, toxicity, environmental pollution, and the like, and their abolition has been promoted on an international level. I have. In addition, hydrocarbon solvents, especially benzene and xylene, are highly toxic and are designated as hazardous substances under the Industrial Safety and Health Act. Since there is a problem that it is not preferable to use it as a cleaning agent, use of a water-based cleaning agent or a water-rinsable cleaning agent is also being studied for cleaning dirt on precision parts and jigs. These detergents have a detergency equal to or higher than that of solvent-based detergents by appropriately selecting and blending surfactants and builders to be used in the detergents. Although there are various advantages such as no cleaning components, on the other hand, if cleaning components remain on precision parts and jigs, they will cause deterioration of electrical properties such as electrical insulation, corrosion of metals, and swelling of plastic members. Have a problem. For this reason, the residual detergent component must be sufficiently rinsed with water or the like, and the equipment and running cost required for this are considerably large. Considering rinsing with water, equipment such as production and storage facilities for ion exchange water and pure water required for rinsing, facilities for heating and cooling for water temperature control, and rinsing liquid supply facilities for rinsing ,
Alternatively, activated sludge made to treat used rinsing liquid, wastewater treatment equipment such as activated carbon treatment is required,
In addition, the operation of these facilities requires the continuous use of utilities and chemicals or labor costs.

Further, various cleaning methods have been proposed or partially implemented in order to suppress an increase in cost associated with rinsing using water, but they are not always satisfactory. That is, the conventional rinsing methods using water can be roughly classified into two methods, one of which is a method of immersing the object to be rinsed in a rinsing liquid, and the other of which is a rinsing liquid. Is discharged onto the object to be rinsed in a discontinuous liquid state or a continuous liquid state. In the actual operation of rinsing, these methods are used alone or in combination. However,
The amount of the detergent liquid remaining on the rinse object depends on the shape of the object to be rinsed , but is generally remarkably small compared to the accumulation thereof, and is particularly remarkable when a treatment such as air blow is performed after the cleaning.
For this reason, if the amount of water used for rinsing is 1 to 300 times the amount of the cleaning liquid adhering to the object to be rinsed, the object to be rinsed cannot be sufficiently immersed by the rinsing method by immersion, and the method of discharging rinsing water does not allow rinsing. since the amount can not be uniformly sprayed onto the rinse was too small, and the rinse water a large amount of rinse water per unit time will flow down from the rinse was without exhibiting sufficient rinsing effect to be supplied is large, A sufficient rinsing effect cannot be obtained.

[0005] Accordingly, an object of the present invention is to provide a precision method using water.
In the method of rinsing parts, a sufficient rinsing effect can be obtained even if the amount of rinsing water is significantly reduced,
As a result, it is an object of the present invention to provide a rinsing method capable of reducing various facilities required for water rinsing and reducing running costs.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above problems, and as a result, when rinsing precision parts (subject to be rinsed) to which a cleaning liquid after cleaning has been attached with water, The rinsing water is finely divided so that the average particle diameter becomes 10 μm to 3 mm , and the amount of the cleaning liquid attached to the object to be rinsed is reduced to 1%.
It has been found that when supplied to the object to be rinsed by spraying or spraying in an amount equivalent to about 300 times, the attached cleaning liquid can be efficiently rinsed with a small amount of water.

[0007] The present invention has been made based on the above findings, and water for rinsing (hereinafter referred to as “rinse”) is finely divided so that the average particle diameter is 10 μm to 3 mm.
The water for rinsing is rinsed with a cleaning liquid prior to rinsing, and is to be rinsed (hereinafter referred to as “rinse target”).
The amount of the cleaning liquid remaining on the object to be rinsed is 1 to 30
A precision unit that removes the cleaning liquid by supplying it so that it becomes 0 times
An object of the present invention is to provide an article rinsing method.

Hereinafter, the method for rinsing precision parts of the present invention will be described.
A description will be given based on the experimental aspect.

To carry out the method of the present invention ,
The phosphorus water, was washed by the washing liquid before rinsing
Of the amount of the cleaning liquid remaining on the rinsed object
It is supplied so as to be up to 300 times. At this time, water for rinsing (rinsing water) is supplied in a finely-divided manner so as to have the above average particle diameter. The amount of water used for rinsing must be 1 to 300 times the amount of the cleaning liquid adhering to and remaining on the object to be rinsed . If the amount is less than 1 time, the amount of rinsing water is too small and the rinsing property is insufficient, and the amount of water is 300 times If the amount exceeds the amount, the amount of the rinsing liquid generated becomes large, and the effect of reducing the drainage load and the like decreases. As a method of supplying the rinse water, for example, a method of spraying from a nozzle under a high pressure, a method of using an ultrasonic oscillator, or a spraying method using centrifugal force, and the like are used. With an average particle diameter of 10 μm
It can be supplied in a form of 3 mm . The average particle diameter of the rinsing is not practical too long the required rinsing time is less particle size 10 [mu], also want intends reduced rinsing efficiency per unit rinsing water is 3mm or more. Upper Symbol rinsing water is 5 to 100 times the amount of residual washing liquid amount is preferred.

In rinsing , it is preferable to set the object to be rinsed in a state where the rinsing liquid quickly flows down.

Although the temperature of the rinsing water in the rinsing method of the present invention is not particularly limited, it is generally 25 to 8.
Used in the range of 0 ° C.

The rinsing method of the present invention described above may be used alone or continuously. Further, it can be used in combination with a conventionally used rinsing method such as an immersion method or a discharge method. These combinations should be considered in consideration of the cost and production speed required for rinsing a certain number of objects to be rinsed , and if the production speed is to be increased, the water of the present invention must be used first in the rinsing process. A system in which a rinsing step using fine particles is performed, where most of the cleaning liquid on the object to be rinsed is removed, and a small amount of the remaining cleaning liquid is removed by an immersion or discharge method is preferable. In this case, the amount of rinsing water used can be significantly reduced as compared with the conventional method, and as a result, wastewater treatment costs can be reduced. If it is desired to drastically reduce the amount of rinsing water and drainage even if the production speed is slightly sacrificed, the rinsing step using the water fine particles of the present invention is performed according to the required rinsing degree of the object to be rinsed .
It may be performed continuously.

[0013] Dirt components derived from the cleaning liquid mixed into the wastewater after use of the rinse, that is, dirt components such as oil, flux and liquid crystal on the cleaning agent and the material to be rinsed are removed by a coagulation sedimentation method or an activated sludge before the drainage. It must be removed by the method or activated carbon adsorption. In order to reduce the cost required for the wastewater treatment, there is a method other than the method of reducing the amount of water used for rinsing, which suppresses contamination of the wastewater with dirt components derived from the cleaning liquid. According to the invention as described above, since the water particles in the rinse method of spraying or sprayed onto the rinse <br/> product can largely removed the cleaning liquid of the rinsing Butsujo with a small amount of the rinse water, rinse generated in this process By installing a dedicated device for collecting waste water after use, it is possible to collect dirt components derived from the cleaning liquid in a concentrated state. As a result, it is possible to reduce the amount of contamination components derived from the cleaning liquid into the precision rinsing liquid that is subsequently performed, and it is possible to reduce the processing time of activated sludge and the like and the amount of activated carbon used. In addition, the dirt components collected in a concentrated state can be treated at low cost such as incineration. By installing the above-mentioned system for collecting the waste water after use of the rinse, the waste water treatment cost can be further reduced.

The equipment for exclusively collecting the waste water after rinsing with the fine water particles according to the method of the present invention may be of any type or system. As a simple example, a method of installing a rinse drainage receiving tank can be considered. The drainage of the receiving tank can be subjected to a treatment such as oil-water separation or the like, or can be used again as rinse water as it is. The cleaning agent or cleaning method used in the present rinsing method is not particularly limited, and is effective for any cleaning agent that can be rinsed with water.

Although the rinsing water is preferably pure water, depending on the purpose, it is also possible to add an antifoaming agent, a rust preventive, a water generating agent or alcohols.

The rinsing method of the present invention has a particularly excellent effect when cleaning precision parts . Here, precision parts are, for example, electronic parts, electric parts, precision mechanical parts, resin processed parts,
Refers to optical components and the like. Electronic components include, for example, printed wiring boards used in computers and their peripheral devices, home appliances, communication devices, OA devices, and other electronic application devices; used in contact members such as IC lead frames, resistors, capacitors, and relays. Hoop materials; OA equipment, clocks, computer equipment,
Liquid crystal displays used for toys, home appliances, etc .; Magnetic recording parts used for video / audio recording / reproducing components and related components; Semiconductor materials such as silicon and ceramic wafers; Electrostrictive components such as quartz oscillators A photoelectric conversion component used for a CD, a PD, a copying device, an optical recording device, and the like. The electric components include, for example, electric motor components such as brushes, rotors, stators, and housings; ticketing components used in vending machines and various devices; and currency inspection components used in vending machines, cash dispensers, and the like. Precision machine parts refer to, for example, bearings used in precision driving equipment, video recorders, etc .; machining parts such as carbide tips. The resin processed part refers to, for example, a precision resin processed part used for a camera, an automobile, and the like. Further, as the optical component, there is a lens used for a camera, spectacles, optical equipment and the like, and as other components, a spectacle frame, a watch case, a watch belt and the like are exemplified.

[0017] The rinsing method of the present invention comprises
It exhibits good performance when cleaning liquid crystal and the like adhering to the printed wiring board or glass substrate with residual flux.Precision parts targeted by the present invention are not limited to these examples. If it is a precision part having a solid surface of a fixed shape to which various processing oils, fluxes and other interfering substances such as flux, or various oily contaminants that deteriorate the properties of the product are adhered, the rinsing method of the present invention is used. Applicable.

When these contaminants are mainly organic oil stains such as oils and fats, machine oils, cutting oils, greases, liquid crystals, and rosin-based fluxes, the phosphorus of the present invention is used.
The features of the method are especially exhibited. This is effective even for dirt mixed with metal powder, inorganic powder and the like.

[0019]

According to the rinsing method of the present invention, the rinsing water is finely divided so that the average particle diameter is 10 μm to 3 mm, and the rinsing water is coated.
When supplied to the rinsing Butsujo, rinse water is uniformly supplied to the rinsing Butsujo, since that time the rinse water amount per unit time can be controlled, flows down without sufficient exhibit the rinsing effect from the rinsing Butsujo Rinsing water can be reduced.

[0020]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Embodiment 1

A printed circuit board of 15 cm × 15 cm was washed with a detergent A [polyoxyethylene nonyl phenyl ether (HLB = 12.3) containing 3% of a rosin flux.
5% (% is based on weight; the same shall apply hereinafter), monoethanolamine 3%, water 82%] or cleaning agent B (butyl glycol alone) and then air blow, and 1 g of detergent on the printed circuit board. The liquid remained. Thereafter, the substrate was set up, and 20 ml of rinsing water having an average particle diameter of 0.5 mm was sprayed on the surface of the substrate by the principle of spraying, and the rinsed liquid dropped from the substrate was collected and analyzed for the amount of detergent. By the rinsing method of spraying water particles having an average particle diameter of 0.5 mm, 90% of the detergent A and 85% of the detergent B on the substrate could be removed. Similarly, when rinsing with an average particle diameter of 2 mm, detergent A
Can be removed by 85%, and similarly, the average particle diameter is 5 mm.
After rinsing, 65% could be removed. Further, as a comparative example, rinsing was performed by spraying 20 ml of rinsing water onto the substrate surface using an injector having a nozzle having a diameter of 3 mm. When the injector was used, only 48% of detergent A and 35% of detergent B could be removed.
In addition, a rinsing method of spraying water particles having an average particle size of 0.5 mm
The detergent A and the detergent B were removed 97% or more.
When rinsing using an injector, use detergent A
To remove 97% or more of detergent B, 650 ml of rinsing water was required.

[0023]

According to the rinsing method of the present invention, precision parts
The rinsing water generated in the rinsing step can be reduced, and the wastewater treatment becomes very easy.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C23G 1/24 H01L 21/302 B08B 3/04

Claims (2)

(57) [Claims] 1. Rinsing (hereinafter referred to as "rinse")
The water for rinsing is finely adjusted to have an average particle diameter of 10 μm to 3 mm, and the water for rinsing is rinsed with a cleaning liquid prior to rinsing (hereinafter referred to as “rinse object”).
) , The amount of the cleaning liquid remaining on the object to be rinsed is 1
The cleaning solution is removed by supplying the cleaning solution up to 300 times,
Rinsing method for precision parts . 2. A system for recovering the liquid after rinsing is included.
The rinsing method according to claim 1 .