JP4449643B2 - How to clean plastic lenses - Google Patents

Description

The present invention relates to a cleaning method for removing dirt adhered to a plastic lens in a cleaning tank .

  Ultrasonic cleaning using ultrasonic waves has been widely performed for cleaning cleaning articles. In order to improve the cleaning performance of this ultrasonic cleaning, methods such as increasing the performance of the cleaning liquid itself, increasing the output of the ultrasonic oscillator, or changing the oscillation frequency are being implemented. The burden is great. Conventionally, solvent-based cleaning agents such as methylene chloride, triethane, trichlorethylene, and chlorofluorocarbon have been frequently used as cleaning solutions. in use. Actually, the cleaning performance of the aqueous cleaning liquid is clearly lower than that of the solvent-based cleaning agent.

  In order to improve the cleaning performance of such ultrasonic cleaning, in the degreasing cleaning apparatus that performs cleaning by immersing the cleaning body in the cleaning storage tank, a gas pressurizing and mixing means is provided in the middle of the cleaning circuit, and the cleaning liquid storage tank A degreasing and cleaning apparatus for mechanical parts in which ultrasonic vibration means is disposed has been proposed (see, for example, Patent Document 1).

JP 7-278860 A

The cleaning apparatus disclosed in Patent Document 1 is said to irradiate a cleaning liquid containing fine bubbles with ultrasonic waves, so that the fine bubbles are united and floated, whereby the liquid flow is activated and the cleaning effect is enhanced. However, the improvement of the cleaning effect up to a certain level can be expected, but the cleaning effect is low, and repeated cleaning operations are required.
Therefore, an object of the present invention is to provide a cleaning method capable of obtaining a high cleaning effect in ultrasonic cleaning using an aqueous cleaning agent.

In order to solve the above-mentioned problem, the cleaning method of the present invention is applied to a cleaning liquid containing a surfactant having a concentration of 0.1 to 50% by weight supplied to the cleaning tank to 0.01 to 0.01% of the cleaning tank internal volume per minute. A 3% amount of air is mixed, and a bubble layer with a thickness of 1 to 50 mm is generated from the surface of the cleaning liquid with bubbles of diameter 0.01 to 2 mm on the surface of the cleaning liquid stored in the cleaning tank. A step of allowing the plastic lens to pass through the foam layer to attach the foam to the plastic lens and immersing the plastic lens in the cleaning solution, and a step of irradiating the cleaning solution with ultrasonic waves to clean the plastic lens. It is characterized by having .

According to the above cleaning method, fine bubbles are generated on the surface of the cleaning liquid by mixing air into the cleaning liquid containing the surfactant to be supplied to the cleaning tank, and when the cleaning article is immersed in the cleaning liquid, Fine bubbles adhere to the surface. By irradiating ultrasonic waves, the dirt attached to the cleaning article is peeled off by the physical force of the ultrasonic wave, and the bubbles attached to the surface of the cleaning article move so as to trace the surface, and the attached dirt is washed. The cleaning quality of the cleaning article is improved by obtaining a high cleaning effect. Moreover, it becomes possible to reduce the usage-amount of a cleaning agent by raising the capability of a washing | cleaning liquid.
Also, depending on the cleaning agent to be selected, in the case of a general aqueous cleaning agent, when the concentration of the surfactant added to the cleaning liquid is 0.1 to 50% by weight, the ability of the cleaning agent itself is exhibited. High cleaning effect can be obtained.
In addition, by mixing the amount of air mixed into the cleaning liquid at 0.01 to 3% with respect to the size of the cleaning tank per minute, a predetermined amount of bubbles of a predetermined size can be generated, High cleaning effect is obtained.
In addition, the size of each bubble generated on the liquid surface of the cleaning liquid can obtain a high cleaning effect when the diameter of the bubble is 0.01 to 2 mm. When the size of the foam exceeds 2 mm, it is difficult for the foam to adhere to the surface of the object to be cleaned, and the cleaning effect decreases. On the other hand, when the thickness is less than 0.01 mm, the effect of moving the surface of the cleaning article due to ultrasonic vibration and bubble breakage is small and the cleaning effect is low.
Furthermore, the thickness of the foam layer generated on the liquid surface of the cleaning liquid is 1 to 50 mm from the liquid surface of the cleaning liquid, so that a high cleaning effect can be obtained. If the thickness of the foam layer exceeds 50 mm, the foam itself will not be fine and the cleaning effect will be lost. On the other hand, when the thickness is less than 1 mm, the cleaning effect is lowered due to too few bubbles adhering to the surface of the cleaning article.
Moreover, the cleaning effect is exhibited by the bubbles adhering to the surface of the cleaning article moving so as to trace the surface. Therefore, it is effective for cleaning articles having fine protrusions and holes (unevenness) as a cleaning article, but has a high cleaning effect on cleaning articles having a smooth surface such as various lenses including eyeglass lenses. can get.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The cleaning method and the cleaning device of the present invention generate a foam layer (hereinafter sometimes referred to as foam) that can be disadvantageous in ultrasonic cleaning on the cleaning liquid surface, and always allow the foam to stay on the liquid surface. Therefore, it is to improve the efficiency of ultrasonic cleaning. Note that the cleaning method of the present embodiment will be described in the case where a cleaning liquid supply unit (pump) is used as an air mixing unit and a spectacle lens (plastic lens) made of plastic, for example, is cleaned as a cleaning article.

FIG. 1 is a schematic view of a cleaning apparatus of the present invention, and FIG. 2 is a schematic view of a peripheral portion of a cleaning tank.
In FIG. 1, a cleaning apparatus 1 includes a cleaning tank 2 for storing a cleaning liquid R, a recovery tank 3 for storing a cleaning liquid R overflowing from the cleaning tank 2, a pump 6 as a cleaning liquid supply means, and a cleaning tank 2 for cleaning liquid R. A nozzle 7 that injects into the inside, a supply pipe 5 that supplies the cleaning liquid R from the collection tank 3 to the nozzle 7 via the pump 6, and a flow control valve 8 as an on-off valve body that adjusts the flow rate absorbed by the pump 6; And a filter 9.

  The cleaning tank 2 is, for example, a box-shaped tank that stores the cleaning liquid R. The cleaning tank 2 is filled with the cleaning liquid R, and the plastic lens 10 as a cleaning article is cleaned in the cleaning liquid R. As shown in FIG. 2, a large number of notches 21 are formed in the peripheral portion of the cleaning tank 2. The details of the notch 21 at the peripheral edge of the cleaning tank 2 will be described later. An ultrasonic oscillator 4 for irradiating the cleaning liquid R with ultrasonic waves is disposed on the bottom of the box of the cleaning tank 2. Note that the ultrasonic oscillator 4 may be disposed on the obliquely lower side or the lateral side surface of the cleaning tank 2 in consideration of the material and shape of the cleaning article.

  The cleaning liquid R is a cleaning liquid containing a surfactant, and based on an aqueous cleaning agent, a surfactant capable of generating bubbles is added. Examples of the surfactant capable of generating bubbles include nonionic and cationic surfactants.

The recovery tank 3 is disposed so as to surround the outer periphery of the cleaning tank 2 and stores the cleaning liquid R that overflows from the cleaning tank 2.
The supply pipe 5 is a distribution pipe that supplies the cleaning liquid R to the cleaning tank 2 via the pump 6, a supply pipe 51 that connects the recovery tank 3 and the liquid absorption (upstream) side of the pump 6, and discharge of the pump 6. It consists of a supply pipe 52 that connects the (downstream) side and the nozzle 7. A flow control valve 8 is provided on the supply pipe 51, and a filter 9 is provided on the supply pipe 52.

  The pump 6 is, for example, an overflow turbine pump capable of sucking, mixing, and pumping (pressurizing) the liquid by a single unit, and the cleaning liquid R accommodated in the recovery tank 3 is absorbed through the supply pipe 51. Air is sucked from the (upstream) side at the same time, and air is sucked and discharged to the supply pipe 52 on the discharge (downstream) side while being pressurized.

  The nozzle 7 is a nozzle that injects the cleaning liquid R supplied to the cleaning tank 2 and is disposed in the tank of the cleaning tank 2 (in the stored cleaning liquid R). The nozzle 7 is composed of, for example, a spray nozzle, is connected to the downstream end of the supply pipe 52, and injects the cleaning liquid R supplied through the pump 6 into the cleaning tank 2 (in the stored cleaning liquid R). As a result, the cleaning liquid R is supplied to the cleaning tank 2 and a liquid flow of the cleaning liquid R is generated in the cleaning tank 2. As for the nozzle 7, a plurality of nozzles can be appropriately disposed at predetermined positions according to the cleaning article. The nozzle 7 is preferably arranged so that the liquid flow passes through the surface of the cleaning article.

  The flow rate control valve 8 is disposed on the liquid absorption side of the pump 6 and adjusts the flow rate of the cleaning liquid R absorbed by the pump 6 by changing the opening of the valve. The flow rate control valve 8 is an electric drive valve, for example, a stepping motor drive valve, and the opening degree of the valve is adjusted by a control signal from a control unit (not shown). Of course, a throttle valve for manually adjusting the opening degree may be provided.

  After the plastic lens 10 is cleaned, the filter 9 removes dirt and the like of the cleaning liquid R accommodated in the recovery tank 3 and discharged from the pump 6 through the supply pipe 51, and the cleaning liquid R passes through the pump 6. Thus, dirt generated from the mechanical sliding portion of the pump 6 mixed in the cleaning liquid R, metal powder due to wear, and the like are removed.

In the cleaning apparatus 1 configured as described above, the cleaning liquid R accommodated in the recovery tank 3 is sucked, air-mixed, and pumped by the pump 6 and injected into the cleaning tank 2 through the supply pipe 5 and the nozzle 7. The cleaning liquid R overflowed from the cleaning tank 2 forms a circulation channel (circulation cycle) that returns to the recovery tank 3 again.
If necessary, a supply pipe (not shown) for supplying fresh cleaning liquid R to the collection tank 3 and a flow meter for measuring / displaying the flow rate of the cleaning liquid R discharged from the pump 6 are provided on the supply pipe 52. Can be arranged.

Next, a cleaning method using the cleaning apparatus 1 will be described.
First, when the power of the cleaning apparatus 1 is turned on, the pump 6 is operated, and the cleaning liquid R recovered in the recovery tank 3 is supplied from the nozzle 7 to the cleaning tank 2 through the supply pipe 5 (51, 52). (In the stored cleaning liquid R). The cleaning liquid R sprayed from the nozzle 7 is a foam of surfactant (bubbles) added to the cleaning liquid R on the surface of the cleaning liquid R in the cleaning tank 2 due to fine air bubbles mixed / pressurized in the pump 6. Layer) B occurs.

  The optimum concentration of the cleaning liquid R that generates the bubbles B varies depending on the cleaning agent to be selected. However, if it is a general aqueous cleaning agent, bubbles can be generated even at a concentration of 100 ppm. However, an appropriate concentration capable of exerting the ability of the cleaning agent itself is about 0.1% to 50%.

  The amount of bubbles B generated can be adjusted by changing the flow rate of the cleaning liquid R absorbed by the pump 6 by changing the opening degree of the flow control valve 8 disposed on the liquid absorption side of the pump 6. it can. The flow rate of the cleaning liquid R is, for example, about 3 to 30 liters per minute if the internal volume of the cleaning tank 2 is 100 liters, and the amount of air mixed into the cleaning liquid R from the pump 6 is 10 cc per minute. To about 3000 cc (that is, 0.01 to 3% of the internal volume of the washing tank 2) is mixed, the optimum amount of bubbles B can be generated. The flow rate of the cleaning liquid R discharged from the pump 6 and the amount of air mixed into the cleaning liquid R may be set in proportion to the volume of the cleaning tank 2.

  Also, 0.01 to 3% of the internal volume of the cleaning tank 2 is mixed with the cleaning solution R having a concentration of about 0.1% to 50%, and the flow rate is adjusted to about 3 to 30 liters per minute. And each magnitude | size of the bubble B which generate | occur | produces on the liquid level of the washing tank 2 can obtain the bubble B whose diameter is 0.01 mm-2 mm, and can acquire a high cleaning effect. When the size of the foam exceeds 2 mm, it is difficult for the foam to adhere to the surface of the object to be cleaned, and the cleaning effect is reduced. On the other hand, when the thickness is less than 0.01 mm, the effect of moving the surface of the cleaning article due to ultrasonic vibration and bubble breakage is small and the cleaning effect is low.

And the foam (bubble layer) B generated on the liquid surface of the cleaning liquid R in the cleaning tank 2 always stays on the liquid surface of the cleaning tank 2 by a large number of notches 21 formed on the peripheral edge of the cleaning tank 2. be able to.
FIG. 2 is a schematic diagram of the peripheral edge of the cleaning tank. As shown in FIG. 2, a large number of, for example, inverted triangular notches 21 are formed in the peripheral edge of the cleaning tank 2. The cleaning liquid R sprayed one after another from the nozzle 7 into the tank of the cleaning tank 2 flows out from the apex portion of the inverted triangle of the notch 21, and only certain bubbles B stay on the liquid surface of the cleaning tank 2.

  The shape of the notch 21 is determined in consideration of the size (internal volume) of the cleaning tank 2 and the supply (discharge) performance of the pump 6. For example, when the supply performance of the pump 6 is high and the shape of the notch 21 is too small, the bubbles B flow out of the cleaning tank 2 without remaining on the liquid surface.

As an example of retaining the bubbles B on the liquid surface of the cleaning tank 2, the size of the cleaning tank 2 is W: 50 × D: 100 × H: 20 cm (capacity: 100 liters), and the cleaning liquid R of the pump 6 When the supply performance is 10 liters / minute, the shape of the cutout 21 is an inverted triangle shape having a bottom of 15 mm and a height of about 10 mm, and is cut at intervals of about 5 cm on the entire circumference of the peripheral edge of the cleaning tank 2. By forming the notch 21, the bubbles B can be retained on the liquid surface of the cleaning tank 2.
The shape of the notch 21 is not limited to a triangle, and may be various squares, and may be a rectangle, a square quadrangle, or a shape with rounded corners.

  In addition, the amount of foam B on the liquid surface of the cleaning tank 2 (the thickness of the foam layer) is effective when fine bubbles are present on the liquid surface, but the foam layer B exhibits a sufficient cleaning effect. An appropriate thickness is about 1 mm to 50 mm. The thickness of the bubble layer B on the liquid level is appropriately determined by changing the opening degree of the flow control valve 8 and changing the flow rate of the cleaning liquid R absorbed by the pump 6 and the number of the notches 21. Can be adjusted. Note that a slide-type moving tool or the like may be configured on the tank wall of the cleaning tank 2, and the depth (size) of the notch 21 may be adjusted by sliding the slide-type moving tool.

  When the power of the ultrasonic oscillator 4 disposed on the bottom surface of the cleaning tank 2 is turned on, the cleaning liquid R in the cleaning tank 2 is irradiated with ultrasonic waves. When the cleaning liquid R is irradiated with ultrasonic waves, the fine bubbles in the cleaning liquid R are broken by the ultrasonic waves, but since the fine air bubbles mixed in the cleaning liquid R are always supplied from the nozzle 7, The fine bubbles will not disappear.

  Then, after the oscillation of the ultrasonic oscillator 4, the plastic lens 10 is carried into the cleaning tank 2 from above the liquid surface indicated by the arrow in FIG. 1 by a transport device (not shown) and immersed in the cleaning liquid R.

  When the plastic lens 10 is immersed in the cleaning liquid R, the plastic lens 10 passes through the bubble (bubble layer) B staying on the liquid surface of the cleaning liquid R, and the bubble b is attached to the lens surface and immersed in the cleaning liquid R. The Unlike the large bubbles, the bubbles B on the liquid level remain on the surface of the plastic lens 10 to some extent even when immersed in the cleaning liquid R. The amount of bubbles b attached to the lens surface varies depending on the material of the cleaning article to be cleaned. In the case of the plastic lens 10, the cleaning effect is exhibited if bubbles are attached to about 5% of the lens surface area. In addition, when the bubble B staying on the liquid surface is large, it rises from the cleaning liquid R toward the liquid surface and disappears.

  The bubbles b adhering to the lens surface of the plastic lens 10 are vibrated and broken by the physical force of ultrasonic waves, and the dirt and the like adhering to the lens surface is cleaned (peeled) by the physical force. Further, the bubbles b are moved above the lens so as to trace the lens surface by the physical force of the ultrasonic wave radiated from the ultrasonic oscillator 4, and the dirt adhering to the lens surface is washed, so that the washing effect can be further enhanced. In addition, the liquid flow of the cleaning liquid R generated when the cleaning liquid R is jetted into the cleaning tank 2 from the nozzle 7 synergistically increases the cleaning effect by the ultrasonic waves.

  Then, the plastic lens 10 immersed in the cleaning solution R of the cleaning tank 2 and cleaned for a predetermined time (irradiation with ultrasonic waves) is pulled upward by the transport device (not shown) in the direction indicated by the arrow in FIG. And is carried out of the washing tank 2. Then, the power source of the ultrasonic oscillator 4 is turned off. After this cleaning is completed, the plastic lens 10 is rinsed with pure water or the like in another ultrasonic cleaning tank and then dried to finish the cleaning operation.

  Such a cleaning method of this embodiment is effective even for a cleaning article having minute protrusions or holes (unevenness) as a cleaning article, but exhibits the most cleaning effect on a cleaning article having a smooth surface. For example, various lenses including spectacle lenses, optical filters, metal plates, and the like. In the cleaning method of this embodiment, the type of dirt is not particularly limited in order to improve the cleaning capability itself.

Next, the plastic lens 10 was cleaned using the cleaning apparatus 1 and the cleaning method described above, and the cleaning quality was evaluated.
As the cleaning liquid R, 5% concentration cleaning liquid R obtained by adding an aqueous cleaning agent (“M-6000” manufactured by Castrol Co., Ltd.) to pure water is stored in the cleaning tank 2, and the pump 6 is operated so that the liquid level of the cleaning tank 2 is reached. A layer of foam B was generated and retained. As a cleaning article, 10 plastic lenses 10 with dirt attached were set in a cleaning container (cleaning basket), carried into the cleaning liquid R in the cleaning tank 2, and irradiated with ultrasonic waves from the ultrasonic oscillator 4 for 60 seconds. And the plastic lens 10 was carried out from the washing tank 2, rinse-washed with another ultrasonic cleaner, dried, and the cleaning condition was confirmed.
As a result, all the cleaned plastic lenses 10 had good cleaning quality with no visible contamination on the lens surface.

  Modifications of the above embodiment will be described below.

(Modification 1)
As a method for retaining the foam layer B on the liquid surface of the cleaning liquid R, the case where the notch 21 is formed at the peripheral edge of the cleaning tank 2 is shown. An embodiment is shown in FIG. FIG. 3 is a schematic view showing another cleaning apparatus, and has the same basic configuration as that of the embodiment shown in FIG. 1 except that the dam plate 22 is disposed in the cleaning tank 2, and FIG. Corresponding parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 3, the generated foam layer B can stay in the cleaning tank 2 by disposing the weir plate 22 in the cleaning tank 2 so as to follow the inner periphery of the cleaning tank. The dam plate 22 is disposed with a predetermined gap so that the cleaning liquid R can pass between the dam plate 22 and the tank wall of the cleaning tank 2. On the other hand, the weir plate 22 can adjust the amount of foam by changing the height position of the cleaning liquid R stored in the cleaning tank 2 from the liquid surface, and the cleaning liquid R stored in the cleaning tank 2 can be adjusted. If the height position from the liquid level is set to a position protruding from the liquid level of, for example, 5 mm, the cleaning liquid R supplied from the nozzle 7 via the pump 6 is transferred from the peripheral edge of the cleaning tank 2 to the recovery tank 3. While overflowing, the foam layer B having a thickness of 5 mm can be obtained in the barrier plate 22. Therefore, the foam layer B can stay in the cleaning tank 2.

  Further, as another method for retaining the foam layer B on the liquid level of the cleaning tank 2, the tank wall is located at a position where a predetermined dimension is lowered from the level of the cleaning liquid R stored in the cleaning tank 2 toward the bottom surface of the cleaning tank 2. The foam layer B can be retained on the liquid surface of the cleaning tank 2 by forming a predetermined number of holes having a predetermined size penetrating the tank wall. The thickness (the amount of foam) of the foam layer B can be adjusted by the discharge capacity of the pump 6, the size of the holes penetrating the tank wall, and the number of holes to be formed.

(Modification 2)
In the above-described embodiment, the case where the pump 6 capable of suction, mixing, and pressure feeding is provided as an example of mixing air into the cleaning liquid R, but another embodiment in which air is mixed into the cleaning liquid R is shown in FIG. Show. FIG. 4 is a schematic diagram of another cleaning apparatus, which has the same basic configuration as that of the embodiment shown in FIG. 1 except for the configuration of the pump 60 and the nozzle 70. The same reference numerals are given, and detailed description thereof is omitted.

  In FIG. 4, a pump 60 constituting the cleaning device 11 is a commonly used pump capable of suction and pressure feeding, and sucks the cleaning liquid R accommodated in the recovery tank 3 through the supply pipe 51 and adds it. Pressurize and discharge (pressure feed) to the supply pipe 52.

  The nozzle 70 is a gas-liquid mixing nozzle, and the cleaning liquid R pumped from the pump 60 is injected into the cleaning tank 2 through the supply pipe 51. Air is mixed into the cleaning liquid R from the intake pipe 71 due to the ejector effect of the jet generated by the injection of the cleaning liquid R, and a foam layer B of the surfactant is generated on the liquid surface of the cleaning liquid R by the fine bubbles of the injected air. be able to. The nozzle 70 and the intake pipe 71 constitute air mixing means.

  In addition, you may comprise so that the pressurized air pressurized with the compressor etc. may be flowed into the intake pipe 71 to the intake pipe. It is preferable that the pressure of the pressurized air is changed by changing the driving force of the compressor or the like, and the speed of the cleaning liquid R sprayed from the nozzle 70 is adjusted. In this case, if the pressure is too high, the liquid level of the cleaning tank 2 may be filled with bubbles, which may cause problems in the cleaning device 11, so it is desirable to use a low foaming surfactant.

(Modification 3)
As an example of generating the foam layer B on the liquid surface of the cleaning tank 2, the case where air is mixed in the cleaning liquid R discharged from the pump 6 is shown. You may supply to the tank 2. FIG. The embodiment is shown in FIG. The cleaning apparatus 12 has the same basic configuration as that of the embodiment shown in FIG. 1 except for the configuration of the pump 60, and the same reference numerals are given to the corresponding parts to those in FIG. To do.

  In FIG. 5, a pump 60 constituting the cleaning device 12 is a generally used pump capable of suction and pressure feeding, and sucks and pressurizes the cleaning liquid R accommodated in the recovery tank 3 through the supply pipe 51. Then, it is sprayed into the cleaning tank 2 from the nozzle 7. Generation (generation) of bubbles B is generated by stirring the cleaning liquid R containing the surfactant contained in the stirring tank 23 using the stirrer 24. The generated foam B is introduced into the cleaning tank 2 by the transport device 25, for example. In this case, as the cleaning liquid R stored in the cleaning tank 2, a general aqueous cleaning agent not containing a surfactant can be used.

The schematic diagram which shows an example of the washing | cleaning apparatus of this invention. The schematic diagram of the peripheral part of a washing tank. The schematic diagram of the washing tank explaining another method of making a foam layer retain in a washing tank. The schematic diagram of the washing | cleaning apparatus explaining another method of mixing air in a washing | cleaning liquid. The schematic diagram explaining another method of supplying foam to a washing tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11,12 ... Cleaning apparatus, 2 ... Cleaning tank, 3 ... Recovery tank, 4 ... Ultrasonic oscillator, 5, 51, 52 ... Supply pipe, 6 ... Pump as air mixing means and cleaning liquid supply means, 7 ... Nozzle , 8 ... Flow control valve as an on-off valve body, 9 ... Filter, 10 ... Plastic lens as cleaning article, 22 ... Dam plate, 60 ... Pump as cleaning liquid supply means, 70 ... Nozzle constituting air mixing means, 71 ... An intake pipe constituting the air mixing means, B ... bubbles, b ... bubbles adhering to the lens surface, R ... a cleaning liquid containing a surfactant.

Claims (1)

A cleaning liquid containing a surfactant having a concentration of 0.1 to 50% by weight supplied to the cleaning tank is mixed with 0.01 to 3% of the air in the cleaning tank per minute and stored in the cleaning tank. A step of generating a foam layer having a thickness of 1 to 50 mm from the surface of the cleaning liquid with a foam having a diameter of 0.01 to 2 mm on the liquid surface of the cleaning liquid,
Passing the plastic lens through the foam layer to attach the foam to the plastic lens and immersing it in the cleaning solution; and
Irradiating the cleaning liquid with ultrasonic waves to clean the plastic lens;
A method for cleaning a plastic lens, comprising:

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