JPH06254521A - Degreasing and cleaning method - Google Patents

Abstract

PURPOSE:To minutely and surely clean the glass product or metallic product and to shorten the cleaning time by ultrasonically vibrating a cleaning soln. from the bottom of a cleaning tank and reciprocating the product at a specified speed at the same time. CONSTITUTION:First and second cleaning tanks 1 and 2, a pure water tank 3 and a hot pure water tank 4 are provided, and a nonionic surfactant or an alkaline surfactant is filled in the tanks 1 and 2 for degreasing a material to be cleaned as a cleaning agent. An ultrasonic vibrator 9 at 40kHz, etc., is arranged on the bottoms of the tanks 1 and 2, and a means for vertically reciprocating the material being ultrasonically cleaned is furnished in the tank 1. This means has a cylinder 8, a cleaning basket 7 is hung from a lifting arm 5 to be vertically moved by the cylinder 8 through a hook 6, the material in the basket 7 is reciprocated at a speed of >=20cm/s, hence the contaminant is reduced, and a cleaning effect is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degreasing / cleaning method for removing dirt adhering to glass products such as lenses, metal products and other products.

[0002]

2. Description of the Related Art As a conventional technique for cleaning products as described above, a cleaning method disclosed in Japanese Patent Laid-Open No. 59-166282 is known. In this method, an ultrasonic vibrator is provided at the bottom of a cleaning tank filled with a cleaning liquid, and ultrasonic waves are applied to the object to be cleaned while reciprocating or rotating the object to be cleaned. In addition, as a device for reciprocating such an object to be cleaned, a mechanism for moving a cleaning basket up and down by raising and lowering an elevating plate is disclosed in Japanese Utility Model Laid-Open No. Sho 88-88576.
Japanese Patent Laid-Open No. 93957/1993 discloses a mechanism for connecting a cam and a rocking frame to convert the reciprocating motion of the cam into the vertical motion of the rocking rod.
Japanese Patent Laid-Open No. 8-84086 describes a mechanism for connecting a swing link to a lifting frame. Therefore, by incorporating these mechanisms into the method of the above-mentioned Japanese Patent Laid-Open No. 59-166282, it becomes possible to easily reciprocate the cleaning object.

[0003]

However, in the cleaning method disclosed in Japanese Patent Laid-Open No. 59-166282, the speed relating to the reciprocating motion and the rotation is unknown, and it cannot be expected that the cleaning is performed well. That is, the ultrasonic waves generate a strength distribution in the depth direction of the cleaning tank, but the normal reciprocating motion of the object to be cleaned, etc. is only to make the ultrasonic waves uniform in the depth direction of the cleaning tank. This is because it is not actively used for cleaning. On the other hand, it is conceivable to combine the above-mentioned mechanism with this cleaning method, but even in this case, the reciprocating motion is at a speed within a common sense range, and the reciprocating motion cannot be positively applied to improve the cleaning power. Not in.

The present invention has been made in consideration of the above circumstances, and applies both ultrasonic vibration and reciprocating motion to cleaning,
An object of the present invention is to provide a degreasing cleaning method that can improve the cleaning power.

[0005]

According to the degreasing and cleaning method of the present invention, ultrasonic vibration is applied to the cleaning liquid from the bottom of the cleaning tank, and at the same time, the object to be cleaned is reciprocated at a speed of 20 cm / s or more. It is characterized by.

Generally, on the surface of the object to be cleaned which is immersed in the cleaning liquid, an affinity action such as dissolution or emulsification occurs between dirt such as oil and the cleaning liquid. When ultrasonic vibration acts in this state, dissolution and emulsification can be promoted and peeling from the object to be cleaned can be promoted. However, depending on the combination and type of the stain and the base material of the object to be cleaned, the affinity is different, so that it becomes difficult to separate the cavitation based on the ultrasonic vibration. For example, it has been found that when a surfactant is used as the cleaning liquid, the process of emulsifying the dirt → peeling does not proceed smoothly and the dirt remains on the surface of the object to be cleaned during the emulsification.

In the present invention, the object to be cleaned is reciprocally moved at a light speed of 20 m / s or more at the same time as such ultrasonic vibration. This high-speed reciprocating motion promotes peeling and removal of dirt during emulsification. can do. That is, since the relative speed between the object to be cleaned and the cleaning liquid is increased by the above-described high-speed reciprocating motion and the shearing force in the direction parallel to the base material of the object to be cleaned effectively acts between the dirt and the base material, This is because the peeling of dirt can be promoted.

Therefore, according to the degreasing and cleaning method of the present invention, not only simple objects to be cleaned but also complicated objects having pores, steps, gaps, etc. can be effectively cleaned. At the same time, even if dirt such as oil containing a large amount of fat is attached, and even if a large amount of this dirt is attached, reliable cleaning can be performed, and the cleaning time can be shortened.

[0009]

First Embodiment FIG. 1 shows a cleaning system to which a first embodiment of the present invention is applied. This embodiment is applied to, for example, a system for cleaning metal products, and is composed of four tanks as a whole. In the figure, the first tank is a first cleaning tank 1 to which this embodiment is applied, the second is a cleaning tank 2 for performing the subsequent cleaning, the second tank is a pure water tank 3, and the fourth tank is a warm pure water tank 4. is there.

The cleaning tank 1 is provided with an elevating arm 5 which moves up and down by power from a driving means (not shown),
A washing basket 7 is hooked on the hook 6 of the lifting arm 5. A cylinder 8 is attached to the lifting arm 5. This cylinder 8 drives the hook 6 to reciprocate at a high speed by its drive, whereby the cleaning basket 7 reciprocates in the vertical direction in a state of being immersed in the cleaning liquid. Such high-speed reciprocating motion is performed at a speed of 20 cm / s or more. An elevating arm 5 and a hook 6 are also provided in the warm pure water tank 4, and the warm pure water tank 4 is used to pull up the cleaning basket 7 at a low speed so that no liquid remains.

The cleaning tanks 1 and 2 are for degreasing the object to be cleaned, and the inside thereof is filled with a nonionic surfactant or an alkaline surfactant as a cleaning liquid. As this surfactant, for example, trade name Bio Seven HTC
(Manufactured by Veritas Co., Ltd.) and product names EE-1110, EE-
1120 (manufactured by Olympus Chemitec) and N
COOL55 (manufactured by National Trading Co., Ltd.) and other surfactants are selectively used. Also, these cleaning tanks 1, 2
The bottom is disposed ultrasonic transducer 9 such 40KH _Z. On the other hand, pure water is supplied to the pure water tank 3 and the warm pure water tank 4 in a free-flowing state.

In the cleaning system having such a structure,
The cleaning tanks 1 and 2 and the pure water tank 3 are at 40 ° C., and the warm pure water tank 4 is 7
The temperature is set to 0 ° C., the flow rate in each tank is set to 1 to 2 liters / min, and degreasing cleaning is performed. In the cleaning tank 1 of the first tank, the ultrasonic vibrator 9 is driven to apply ultrasonic vibration, and the cylinder 8 causes the cleaning basket 7 to reciprocate at a speed of 30 cm / s. In the second cleaning tank 2, only ultrasonic vibration is applied. As the object to be cleaned, an aluminum flat plate to which the trade name Cut 201A (manufactured by Mitsubishi Petroleum Co., Ltd.) and the trade name Daphne Cut HS-5 (manufactured by Idemitsu Petroleum Co., Ltd.) were respectively attached, was placed in a washing basket Washing was sequentially performed with a 1-minute tact.

That is, after the treatment of the first cleaning tank 1,
The object to be cleaned is transferred to the second cleaning tank 2, and ultrasonic vibration is performed in the same tank 2 for 1 minute. After that, it is transferred into the pure water tank 3 of the second tank, rinsed for one minute while still standing, and then transferred into the warm pure water tank 4 of the fourth tank, and pulled up at a slow speed to complete the cleaning.

The aluminum flat plate subjected to the above operation was visually inspected with an optical microscope at a magnification of 50. As a result, it was confirmed that the aluminum flat plate was clean without stains or stains. Moreover, when this aluminum plate was subjected to a contact angle test, the results are shown in Table 1.

[0015]

[Table 1]

In the same table, Comparative Example 1 shows the contact angle when washed in three trichloroethane tanks, and the fact that the contact angle is comparable to that of this Comparative Example proves that the cleaning is clean. Incidentally, the aluminum plate has a contact angle of about 60 when oil is attached.

FIG. 2 shows a comparative example 2 of this embodiment, in which the same elements are designated by the same reference numerals. That is, the cleaning tank 1 is provided an ultrasonic transducer 9 40KH _Z, in hot deionized water tank 4 is provided with a lifting arm 5 and the hook 6. In comparison with the comparative example, the same surfactant and cutting oil as in Example 1 were used for washing under the same conditions, and then a contact angle test was conducted. As a result, a large value as shown in Table 1 was obtained. The cleanliness was poor. Also, in the inspection with an optical microscope at 50 times, oil residue was found at the end.

FIG. 3 is a characteristic diagram in which the reciprocating speed and the cleaning property with respect to oil are measured in this embodiment. An oil containing fat was used and this oil was adhered to an aluminum flat plate. The detergency was determined by ESCA in which the degree of detergency of this oil was 100% and the amount of carbon remaining on the surface was converted into its peak intensity. As can be seen from the figure, it is 10 at high speed reciprocating motion of 20 cm / s or more
It has a detergency of 0%.

[0018]

Second Embodiment FIG. 4 shows a cleaning system to which a second embodiment of the present invention is applied, and the same elements as those in FIG. 1 are designated by the same reference numerals and correspond to each other. The present embodiment is applied to, for example, a system for cleaning glass products such as lenses, and is composed of 10 tanks in total. The first tank and the second tank are cleaning tanks 3 filled with trichloroethane as a cleaning liquid.
1 and 32, the third and fourth tanks are cleaning tanks 33 and 34 filled with the same surfactant as in Example 1, and the fifth and sixth tanks are city water tanks 35 and 36 filled with city water. , 7th tank is pure water tank 37, 8th tank and 9th tank are IPA tanks 38, 3
The 9th and 10th tanks are the drying tanks 40 made of Freon vapor. Ultrasonic transducer 9 (28KH _Z) cleaning tank 31,
32, 33, 34 are arranged.

The first tank cleaning tank 31 and the third tank cleaning tank 33 are tanks to which this embodiment is applied, and the lifting arm 5 is used.
The cylinder 8 is attached to the hook 6, and the hook 6 reciprocates at a high speed of 40 cm / s by the cylinder.

In the cleaning system having the above construction, the flow rate of each tank except the drying tank 40 is set to 1 to 2 liters / min, and the cleaning tanks 31, 32, 33 and 34 are set at 40 ° C.
The drying tank 40 is set at 70 ° C. Then, the object to be cleaned is placed in each tank for one minute and processed.

In this embodiment, the trade name "Yushiron C"
G "(manufactured by Yushiro Kagaku Co., Ltd.) and a glass plate to which each centering oil of trade name Duffney Cut is attached as the object to be cleaned, the above-mentioned treatment is carried out, and a visual inspection by an optical microscope of 50 times and XPS (X The evaluation was performed by line photoelectron spectroscopy. It was confirmed by visual inspection that the glass plate was clean without stains or stains. Table 2 is an XPS evaluation. Comparative Example 3 in the table has two trichloroethane tanks.
3 tanks, 3 surfactant tanks, 1 city water tank, 1 cleaning tank
This is a cleaning system consisting of 14 tanks, 2 tanks, 2 city water tanks, 1 pure water tank, 3 IPA tanks, and 1 fluorocarbon tank. In this example, compared with Comparative example 3, the remaining amount of organic matter is about the same, the organic matter is clean, and the number of tanks is small.

[0022]

[Table 2]

[0023]

As described above, according to the present invention, since the ultrasonic vibration is applied and the object to be cleaned is reciprocated at a high speed,
It is possible to reliably remove dirt, reduce the number of tanks in the cleaning system, and shorten the cleaning time.

[Brief description of drawings]

FIG. 1 is a perspective view of a cleaning system to which a first embodiment of the present invention is applied.

2 is a perspective view of Comparative Example 1. FIG.

FIG. 3 is a characteristic diagram of reciprocating speed and cleaning property.

FIG. 4 is a perspective view of the second embodiment.

[Explanation of symbols]

 1, 2 Washing tank 3 Pure water tank 4 Hot pure water tank 5 Lifting arm 6 Hook 7 Washing basket 8 Cylinder

Claims (1)

[Claims] 1. A degreasing cleaning method, wherein ultrasonic vibration is applied to the cleaning liquid from the bottom of the cleaning tank, and at the same time, the object to be cleaned is reciprocated at a speed of 20 cm / s or more.