JPH0515859A - Washing method for fabricated products, washing method for resin molding and production of resin molding - Google Patents

Abstract

PURPOSE:To provide the washing method for fabricated products, the washing method for resin molding and the process for production of the resin moldings in such a manner that there are no problems of a waste water treatment even if washing water is used. CONSTITUTION:A washing device 10 consists of 1st, 2nd degreasing tanks 11, 13 for executing washing and rinsing stages, 1st, 2nd recovering tanks 12, 14, 1st, 2nd rinsing tanks 15, 16 for executing rinsing stage, a pure water tank 77, a draining tank 18 for executing a draining stage, a drying tank 19 for executing a drying stage, a tank 20 and a 1st pump 21, and a 2nd pump 22 for supplying the washing water discharged from the 2nd degreasing tank 13 to a washing water supplying chamber 44. A concentrating device 40 functions to separate the washing water generated from the washing and rinsing stages to the concd. liquid of the detergent and steam so as to reutilize the concd. liquid of the detergent in the washing and rinsing stage and to release the steam into the atm. and consists of an atm. heating chamber 41, a concd. liquid supplying chamber 43, a separating chamber 43, a washing water supplying chamber 44, and a steam releasing chamber 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a processed product, a method for cleaning a resin molded product, and a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, a resin molding product obtained by molding a resin material in a molding process (for example, a transport guide used in a paper discharge section of a laser beam printer) is coated with a coating process (a surface treatment process). Before coating with the above), the mold release agent adhering to the surface of the resin molded product is cleaned in the cleaning process. In this cleaning process, CFCs are generally used because they are harmless, nonflammable and inexpensive. It is used.

However, since CFCs destroy the ozone layer, CFCs have been regulated internationally since 1989, and there is an urgent need to develop a cleaning method that does not use CFCs.
As one of the cleaning methods that does not use CFC, there is a cleaning method using cleaning water.

[0004]

However, in the method of washing with washing water, washing with water for removing the washing water adhering to the surface of the resin molded article after washing is indispensable, and therefore a large amount of water used for washing is required. Wastewater treatment becomes a problem. The problem also occurs when removing unnecessary substances attached to the surface of a processed product such as glass with cleaning water.

An object of the present invention is to provide a method for cleaning a processed product, a method for cleaning a resin molded product, and a method for manufacturing a resin molded product, which have no problem of waste water treatment even if cleaning water is used.

[0006]

A method for cleaning a processed product according to the present invention comprises a cleaning water cleaning step of cleaning unnecessary substances adhering to the surface of the processed product with cleaning water, and the above-mentioned cleaning process performed in the cleaning water cleaning step. A washing method comprising a washing step of washing the processed product, a draining step of draining the processed product washed in the washing step, and a drying step of drying the processed product drained in the draining step, Water containing a cleaning agent generated in the cleaning water cleaning step is separated into a concentrated solution of the cleaning agent and steam, and the concentrated solution of the cleaning agent is reused in the cleaning agent cleaning step, and the steam is released to the atmosphere. discharge.

Here, the waste water generated in the washing step and the draining step may be reused in the washing step. The method for cleaning a resin molded product of the present invention comprises a cleaning water cleaning step of cleaning the mold release agent adhering to the surface of the resin molded product with cleaning water, and the resin molded product cleaned in the cleaning water cleaning step. In a method of washing a resin molded article, which comprises a water washing step, a water draining step of draining the resin molded article washed in the water washing step, and a drying step of drying the resin molded article drained in the water draining step, Water containing a cleaning agent generated from the cleaning water cleaning step is separated into a concentrated solution of the cleaning agent and steam, and the concentrated solution of the cleaning agent is reused in the cleaning step of the cleaning agent, and the steam is used in the atmosphere. To release.

Here, the waste water generated in the washing step and the draining step may be reused in the washing water washing step. The method for producing a resin molded article of the present invention comprises a molding step of molding a resin material to obtain a resin molded article, a washing step of washing the resin molded article obtained in the molding step, and a washing step performed in the washing step. And a surface treatment step of treating the surface of the resin molded article. In the method for producing a resin molded article, the washing step is a washing with water for washing the release agent adhering to the surface of the resin molded article with washing water. Step, a washing step of washing the resin molded article washed in the washing water washing step with water, a draining step of draining the resin molded article washed in the water washing step, and a draining step of the draining step A drying step of drying the resin molded product, and separating water containing a detergent generated from the washing water washing step into a concentrated solution of the detergent and steam, and the concentrated solution of the detergent is the washing water. It can be reused in the cleaning process and The water vapor is released into the atmosphere.

Here, the waste water generated in the washing step and the draining step may be reused in the washing water washing step.

[0010]

In the method for cleaning a processed product according to the present invention and the method for cleaning a resin molded product according to the present invention, water containing a cleaning agent generated in the cleaning water cleaning step is separated into a concentrated solution of the cleaning agent and steam to remove steam. Wastewater can be treated in the form of water vapor that does not adversely affect the environment by releasing it into the atmosphere. In addition, the concentrated solution of the cleaning agent can be reused in the cleaning water cleaning process to remove the cleaning agent. Can be effectively used.

In the method for producing a resin molded product according to the present invention, the resin molded product is washed by the method for cleaning a resin molded product according to the present invention, so that the resin molded product can be washed without using CFC and without the problem of wastewater treatment. After that, the surface can be treated.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a CFC-less cleaning device for explaining an embodiment of a method for cleaning a resin molded product of the present invention. This CFC-less cleaning device includes a cleaning device 10 and a concentrating device 40.

The cleaning device 10 comprises the following components. (1) The first degreasing tank 11, the first collecting tank 12, the second degreasing tank 13 and the second collecting tank 14 These tanks are used to wash the mold release agent adhering to the surface of the resin molded product with cleaning water. It is provided to perform a washing water washing step of washing. Here, the first degreasing tank 11 is filled with cleaning water containing a cleaning agent (at a temperature of about 55 ° C.), and is used for first cleaning the release agent attached to the surface of the resin molded product. . The first recovery tank 12 is for cleaning the cleaning agent attached to the surface of the resin molded product cleaned in the first degreasing tank 11 with water and recovering it. The second degreasing tank 13 is filled with cleaning water containing a cleaning agent (temperature of about 55 ° C.), and the mold release agent remaining on the surface of the resin molded product washed with water in the first collecting tank 12 is removed again. It is for cleaning. The second recovery tank 14 is for cleaning the cleaning agent adhering to the surface of the resin molded product cleaned in the second degreasing tank 13 with water and recovering it.

(2) First washing tank 15 and second washing tank 1
6 and deionized water tank 17 These tanks are provided to perform a water washing step of washing the resin molded article washed in the washing water washing step, and the surface of the resin molded article washed in the second recovery tank 14 is washed. Wash the remaining cleaning agent in. (3) Drainer tank 18 The drainer tank 18 is provided to perform a draining process of draining the resin molded product washed in the water washing process, and is attached to the surface of the resin molded product washed in the pure water tank 17. Remove the deionized water.

(4) Drying Tank 19 The drying tank 19 is provided for performing a drying step of drying the resin molded product drained in the draining step.
In step 8, the resin molded product from which pure water has been removed is dried. (5) Tank 20 and first pump 21 The tank 20 and the first pump 21 are provided to reuse the waste water generated in the washing and draining steps in the washing water washing step. Here, the tank 20 is for temporarily storing the waste water discharged from the first washing tank 15 and the draining tank 18. Further, the first pump 21 is for supplying the waste water in the tank 20 to the first recovery tank 12 and the second recovery tank 14.

(6) Second Pump 22 The second pump 22 is a detergent for the concentrating device 40, which will be described later, containing water containing a cleaning agent discharged from the second degreasing tank 13 (hereinafter referred to as "detergent water"). It is for supplying to the water supply chamber 44. The concentrating device 40 separates water (detergent water) containing a cleaning agent generated from the cleaning water cleaning step into a cleaning agent concentrated solution and steam, and reuses the cleaning agent concentrated solution in the cleaning water cleaning step. It is used to release water vapor to the atmosphere and consists of the following components.

(1) Atmosphere heating chamber 41 The atmosphere heating chamber 41 has a heater 41a and a fan 41b.
(0%) is taken in and heated to a temperature of about 60 ° C., and then the heated atmosphere (hereinafter, referred to as “heated atmosphere”) is blown upward in the drawing by the fan 41b.

(2) Concentrated liquid supply chamber 42 The concentrated liquid supply chamber 42 is blown up by the fan 41b.
The heated atmosphere is supplied to the upper separation chamber 43 in the drawing.
In addition, the concentrated liquid of the cleaning agent separated in the separation chamber 43 described later
It is returned to the second degreasing tank 13 of the cleaning device 10. (3) Separation chamber 43 The separation chamber 43 has a flower-shaped packing (for example, Nittetsu Kakoki stock
It is filled with company-made M-type terraret) and will be described later.
Contact the detergent water supplied from the detergent water supply chamber 44 with the heated atmosphere.
Touch it to evaporate the water content of the detergent water in a heated atmosphere.
Thus, the detergent water is separated into the concentrated liquid of the cleaning agent and the steam.
Here, the cleaning agent must not deteriorate in performance even if it is concentrated.
Used as a cleaning agent for mold release agents for resin molded products
Possible P ₃ grato20 (made by Henkel Hakusui Co., Ltd.)
You can use it.

(4) Detergent Water Supply Chamber 44 The detergent water supply chamber 44 has a shower pipe 44a, and the detergent water sent from the second degreasing tank 13 by the second pump 22 is evenly distributed in the shower pipe 44a. And is supplied to the separation chamber 43 on the lower side of the drawing. (5) Water vapor release chamber 45 The water vapor release chamber 45 has a water drop removal filter 45a and a mist removal filter 45b, and water drops contained in the water vapor separated in the separation chamber 43 and passing through the detergent water supply chamber 44. After removing the mist and the mist with the water drop removing filter 45a and the mist removing filter 45b, respectively, the water vapor is discharged into the atmosphere through a discharge port (not shown). Here, for example, a sunloid eliminator (registered trademark, manufactured by Tsutsunaka Plastic Industry Co., Ltd.) can be used as the water drop removal filter 45a, and, for example, Saran Lock (registered trademark, manufactured by Asahi Dow Co., Ltd.) can be used as the mist removal filter 45b. ) Can be used.

In this CFC-less cleaning device, pure water is supplied to the pure water tank 17 from the outside, pure water is supplied from the pure water tank 17 to the second water washing tank 16, and first water is supplied from the second water washing tank 16 to the first water washing tank 16. Pure water is supplied to the water washing tank 15. Pure water containing a small amount of cleaning agent is supplied from the first recovery tank 12 to the first degreasing tank 11, and the second recovery tank 1 is supplied to the second degreasing tank 13.
By supplying pure water containing a small amount of cleaning agent from 4,
Even if the number of washings progresses, the first and second degreasing tanks 11 and 13
Prevents the internal washing water from running out. Further, first to third liquid level sensors 31 to 33 are attached to the first degreasing tank 11, the second degreasing tank 13 and the tank 20, respectively, to prevent overflow of cleaning water and the like. There is.

Since the CFC-less cleaning device is configured as described above, the first cleaning tank 15 and the draining tank 1
The wastewater discharged from the tank 8 is once stored in the tank 20, and then supplied to the first and second recovery tanks 12 and 14, and the detergent water discharged from the second degreasing tank 13 is concentrated by the concentrating device 40 into a concentrated solution of the cleaning agent and steam. Since the harmless water vapor can be released into the atmosphere after separating into water and water, there is no problem with wastewater treatment of a large amount of water used for washing.

In the above description, the case where the mold release agent of the resin molded product is cleaned with cleaning water has been described. However, the CFC-less cleaning device shown in FIG. 1 uses oil or dust adhering to the surface of a processed product such as glass. It can also be applied when cleaning etc.
Next, an example of the method for producing a resin molded product of the present invention will be described. The method for producing a resin molded article of this embodiment includes a molding step of molding a resin material to obtain a resin molded article, a washing step of washing the resin molded article obtained in the molding step, and a resin washed in the washing step. It is the same as the conventional method for producing a resin molded product in that it has a surface treatment step of treating the surface of the molded product, but the cleaning step is a cleaning water for cleaning the release agent of the resin molded product with cleaning water. A washing step, a washing step of washing the resin molded article washed in the washing water washing step with water, and a draining step of draining the resin molded article washed in the washing step
And a drying step of drying the resin molded product drained in the draining step, separating water containing a detergent generated from the washing water washing step into a detergent concentrate and water vapor, and a detergent concentrate. Is different from the conventional method for producing a resin molded product in that it is reused in the washing water washing step and that water vapor is released into the atmosphere.

That is, for example, when the method for manufacturing a resin molded product is used to manufacture the transport guide 50 used in the paper discharge section of the laser beam printer LBP-B406 manufactured by Canon as shown in FIG. The operation in the process is as follows. (1) Molding process ABS, which is one of the resin materials, using a known resin molding machine
The conveyance guide 50, which is one of the resin molded products, is molded using (acrylic / butyl / styrene). A release agent is attached to the surface of the transport guide 50 taken out from the resin molding machine.

(2) Cleaning Step In order to clean the release agent adhering to the surface of the transport guide 50, the transport guide 50 is cleaned using the fluorocarbon cleaning device shown in FIG. First, the conveyance guide 50, the cleaning agent (Henkel Hakusui Co. P ₃ grato20, concentration of 4%)
After being immersed in the first degreasing tank 11 filled with cleaning water (temperature of about 55 ° C.) containing water and cleaned, the first recovery tank 12
Soaked in and washed with water. Then, the transport guide 50
, The cleaning agent (Henkel Hakusuisha made of P ₃ grato20,
After being immersed in the second degreasing tank 13 filled with cleaning water (temperature of about 55 ° C.) containing a concentration of 2%) and washed again, it is immersed in the second recovery tank 14 and washed with water (above, Washing water washing step). Subsequently, the transport guide 50 is dipped in the first water washing tank 15, the second water washing tank 16 and the pure water tank 17 in this order to be washed with water (water washing step), and after being drained in the water draining tank 18 (water draining step), It is dried in the drying tank 19 (drying step). At this time, the water containing the cleaning agent (detergent water) generated in the cleaning water cleaning step is separated by the concentrating device 40 into a cleaning agent concentrated solution and water vapor, and the cleaning agent concentrated solution is reused in the cleaning water cleaning step. At the same time, water vapor is released into the atmosphere.

(3) Surface Treatment Step (Painting Step) The transport guide 50 from which the mold release agent has been removed in the washing step is sent to the coating step, and the surface thereof is UV coated by a known coating device. Therefore, in this method for producing a resin molded product, a large amount of wastewater generated in the cleaning step is converted into water vapor and discharged into the atmosphere, so that there is no problem of wastewater treatment.

The resin molded product to be washed is shown in FIG.
Not only the conveyance guide 50 shown in FIG.
In addition to the separation claw 60 made of PPS (polyphenylene sulfide) used in the paper discharge part of the Canon laser beam printer LBP-B406, a conveyance guide made of resin material used in copiers, printers and facsimiles It may be a paper guide, an exterior plate, a separation claw, an operation button, or a plastic lens.

As the material of the resin molded product, in addition to ABS (acrylic butyl styrene) and PPS (polyphenylene sulfide) mentioned above, PC (polycarbonate), PPO (polyphenylene oxide), acrylic resin, fluorine resin, PUR (Polyurethane), PP
(Polypropylene), PE (Polyethylene), PVC
It may be (vinyl chloride), EP (epoxy resin), PA (polyamide), or the like.

Further, the surface treatment step in the method for producing a resin molded product may be a coating step of the antireflection film of the plastic lens or the like, in addition to the above-mentioned coating step. As a cleaning agent for mold release agents for resin molded products,
In addition to the above-mentioned P ₃ grato 20 (manufactured by Henkel Hakusui), LT 3600 of Henkel Hakusui P ₃ series
5, Siliron 41, EP-680, Saxin,
Upon and P3-T180 can also be used.

[0029]

As described above, the present invention has the following effects. The method for cleaning a processed product and the method for cleaning a resin molded product according to the present invention comprises separating water containing a cleaning agent generated from a cleaning agent cleaning step into a concentrated solution of the cleaning agent and steam, and releasing the steam into the atmosphere. As a result, the wastewater can be treated in the form of water vapor that does not have an adverse effect on the environment, so that the problem of wastewater treatment does not occur even if the wash water is used.

The method for producing a resin molded article of the present invention is
By cleaning the resin molded product by the method for cleaning a resin molded product according to the present invention, the problem of wastewater treatment does not occur even if cleaning water is used in the cleaning step.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a CFC-less cleaning device for explaining an embodiment of a method for cleaning a resin molded product of the present invention.

FIG. 2 is a perspective view of a conveyance guide showing an example of a resin molded product manufactured by the method for manufacturing a resin molded product of the present invention.

FIG. 3 is a perspective view of a separation claw showing another example of the resin molded product manufactured by the method for manufacturing a resin molded product of the present invention.

[Explanation of symbols]

10 Cleaning device 11 First degreasing tank 12 First collection tank 13 Second degreasing tank 14 Second recovery tank 15 First flush tank 16 Second washing tank 17 Pure water tank 18 drainage tank 19 drying tank 20 tanks 21 first pump 22 Second pump 31 First Liquid Level Sensor 32 Second liquid level sensor 33 Third Liquid Level Sensor 40 Concentrator 41 Atmosphere heating chamber 41a heating heater 41b fan 42 Concentrate supply room 43 Separation room 44 Detergent water supply room 44a shower tube 45 Water vapor release chamber 45a Water Drop Removal Filter 45b Mist removal filter 50 Transport guide 60 separate nails

Claims (6)

[Claims] 1. A washing water washing step of washing undesired substances adhering to the surface of the processed product with washing water, a washing step of washing the processed product washed in the washing water washing step with water, and a washing step in the washing step. And a draining step for draining the processed product,
In a cleaning method comprising a drying step of drying the processed product drained in the draining step, water containing a cleaning agent generated in the cleaning water cleaning step is separated into a concentrated solution of the cleaning agent and steam, A method for cleaning a processed product, wherein the concentrated solution of the cleaning agent is reused in the cleaning agent cleaning step, and the water vapor is released into the atmosphere. 2. The method for cleaning a processed product according to claim 1, wherein the waste water generated in the water washing step and the water draining step is reused in the washing water washing step. 3. A washing water washing step of washing the release agent adhering to the surface of the resin molded article with washing water, a water washing step of washing the resin molded article washed in the washing water washing step, and the water washing. In the method for washing a resin molded product, which comprises a draining process for draining the resin molded product washed in the step, and a drying process for drying the resin molded product drained in the draining process, The water containing the generated cleaning agent is separated into a concentrated solution of the cleaning agent and steam, and the concentrated solution of the cleaning agent is reused in the cleaning agent cleaning step, and the steam is released into the atmosphere. Cleaning method for molded resin products. 4. The method for cleaning a resin molded product according to claim 3, wherein the waste water generated in the water washing step and the water draining step is reused in the washing water washing step. 5. A molding step of molding a resin material to obtain a resin molded article, a washing step of washing the resin molded article obtained in the molding step, and a washing step of the resin molded article washed in the washing step. In the method for producing a resin molded article, which comprises a surface treatment step of treating the surface, the washing step includes a washing water washing step of washing the mold release agent adhering to the surface of the resin molded article with washing water, and the washing water. A washing step of washing the resin molded article washed in the washing step with water, a draining step of draining the resin molded article washed in the washing step, and a drying of the resin molded article drained in the draining step. A drying step, and separating water containing a cleaning agent generated in the cleaning water cleaning step into a concentrated solution of the cleaning agent and steam, and reusing the concentrated solution of the cleaning agent in the cleaning water cleaning step. Together with the water vapor in the atmosphere A method for producing a resin molded product, characterized in that 6. The method for producing a resin molded product according to claim 3, wherein the waste water generated in the washing step and the draining step is reused in the washing step.