KR880000020B1 - Method and apparatus for treating exhausted film for using as reclaimed raw material - Google Patents

Abstract

A mass of waste films of synthetic resins is immersed in liquid detergent bath after pulvalizing and placed under the application of ultrasonic waves to separate foreign materials off the surfaces of the film pieces, which are loosened from one another and whose folds and wrinkles are straightened by means of the liquid flow. The ultrasonic wave is arranged to be applied to the both surfaces of the films. The liquid flow is directed in the film feed direction to recycle. The processed waste film is cleansed in pressured showers of water.

Description

Waste film treatment method for recycled raw materials and apparatus

1 is a schematic diagram of an apparatus for implementing the method of the present invention.

2 is a schematic plan view of the cleaning bath of the apparatus of the present invention.

3 is a side cross-sectional view of the cleaning tank of FIG.

4 is a cross-sectional view taken along the line X-X of FIG.

The present invention provides a method for separating and removing foreign matters such as contaminants or contaminants attached to a thin film for reclaiming and using thin film waste made of thermoplastic synthetic resin such as polyvinyl chloride and polyethylene, and for carrying out the method. Relates to a device.

In recent years, the problem of energy saving, in particular, the saving and efficient use of petroleum and primary products made from it, have been gradually surfaced. On the other hand, with the spread of facility horticulture reflecting diversification and advancement of demand for horticultural crops, the amount of agricultural synthetic resin thin film mainly containing vinyl chloride thin film is rapidly increasing, and the amount of waste is rapidly increasing. Such disposal of synthetic resin products requires re-examination of both the energy saving problem and the pollution problem described above, and recycling of waste is considered as one of the effective measures to effectively solve the problem.

However, bundles of waste synthetic resin films collected and collected at farms usually contain impurities such as soil, small stones, wires, nails, cans, and glass, and impurities such as sludge and oil. Separation, removal and cleaning of foreign matter are particularly important for the efficient and safe operation of subsequent grinding, refining, and regeneration, and the emergence of a method of efficiently cleaning a synthetic resin material has great significance.

There, conventionally, the waste synthetic resin thin film has been interested in the treatment of thin film waste formed of polyvinyl chloride or polyethylene, which is widely used in agriculture, horticulture houses and tunnels, and has been attempted to use the recycled resin.

The conventional method of reclaiming used in this way is generally sent to the process of first bundling the waste thin film and roughly crushing it in the form of a compressed lump, and then crushing it to a width of about 50 mm by a cutter. In the following foreign matter separation step, the foreign matter separation step is usually carried out by stirring and washing with bubbles in flowing water to remove small stones, nails, sand, and dust.

Therefore, these thin film pieces are cut into sizes of about 13-30 mm in the next grinding step, and in the poly separation step, the mixed polyethylene thin film is separated from polyvinyl chloride, and only polyvinyl chloride is dehydrated in the next step. Send to.

Dewatering is usually used as a centrifugal dehydrator, which consists of a rotating cone and a screw in it. A thin film is put into the center of the cone and pushed against the wall of the nose under the action of centrifugal force. This is removed in a large downward direction. The thin film pieces thus dehydrated are stirred by a screw and dried in the next drying step to form a final product, a so-called flap. Flaps are recycled, for example, as raw materials for molding vinyl chloride pipes.

However, since the separation action of the foreign matter separation process in the conventional method is mainly caused by air stirring in water, foreign substances having a large specific gravity such as small stones, metals, and sand are removed, but relatively light sludge sludge attached to the thin film pieces is removed. It is difficult to do, and in particular, oils and the like are hardly removed.

) 구겨짐 등의 변형이 고정된 상태로 되어 있으며, 수중에서도 충분히 펴지지 않기 때문에 그들의 변형 사이에 개재, 부착하는 이물질이나 더러운 물은 더욱 탈락하기 어렵다. 이 공정에 있어서 청정도의 부족은 최종제품의 품질을 저하시킬 뿐만이 아니고 후속 공정에 여러가지의 악역향을 미친다. 즉, 다음의 분쇄공정에서는 기름때가 잔류하고 있으면 절단칼의 절단작용을 나쁘게 하며 오니가 남아 있으면 칼을 손상하거나 마모를 빠르게 하게된다. 또, 오니가 다음의 탈수공정까지 잔류하고 있으면, 코온의 내측벽면에 모래진흙이 침적하여 스크류우와 벽면에 플라프가 끼여서 스크류우의 날개를 휘어지게 하거나 탈수효율을 저하시키는 등의 장애가 생긴다.In addition, the thin film piece before treatment is not only hardened over time, but also stretched, bound, and stretched further during deposition.

C) Deformation such as wrinkles is fixed, and because they are not sufficiently unfolded in water, foreign substances or dirty water interposed between them are hard to fall off. The lack of cleanliness in this process not only degrades the quality of the final product but also causes various adverse effects on subsequent processes. In other words, in the following grinding process, if the grease remains, the cutting action of the cutting knife is bad, and if the sludge remains, the knife is damaged or wear is accelerated. In addition, when sludge remains until the next dehydration process, sand mud is deposited on the inner wall surface of the coon, causing plaque to enter the screw and the wall, causing the wing of the screw to bend or lowering the dewatering efficiency.

Therefore, even if sufficient water washing is performed in the grinding step or the poly separation step to remove these sludges, a good result is not obtained.

Therefore, the present inventor has made a thorough study to solve such problems of the conventional technology. As a result, the inventors pay attention to the cleaning effect of the ultrasonic wave and use it, and at the same time, the cleaning effect is increased synergistically to remove the dirty water or contaminants mentioned above. Knowing that it can be completely removed in a very short time, first, the waste thin film lump-like object made of thermoplastic synthetic resin is crushed and then precipitated in the cleaning liquid so that the closed thin film in the cleaning liquid becomes a flexible state. Holds the cleaning liquid at the temperature of the liquid that is stretched out and disappears substantially, and uses the flow of the cleaning liquid at this temperature to soften while lumping the lump-like object of the closed thin film in the liquid, thereby smoothing the above-described deformation. At the same time, the ultrasonic thin film was irradiated onto the closed thin film fragment. It proposed a method for separating and removing foreign matter above.

However, this method has a superior cleaning effect compared to the conventional method, but the liquid flow state accompanying the outflow of the closed thin film pieces in the direction of transport in the cleaning tank in one direction, and the residence time in the cleaning tank. In addition, there was also insufficient agitation, and the penetration into the lump-like depth of the closed thin film was not sufficient and the effect of the satisfactory level was not obtained.

Of course, if the length of the tank is increased in order to increase the residence time in the cleaning tank, even if some resolution is achieved, there is a problem that the installation area is enlarged, and thus cannot be said to be practical.

In particular, in the use of the above-mentioned ultrasonic waves, the vibrators are arranged on both sides of the bottom of the washing tank to irradiate the ultrasonic waves obliquely upward from the bottom of the tank, so that even if the liquid vibration is applied, sufficient effect on the thin film of the lung is achieved. It is not possible to give it, and this is also considered to be one cause of anticipation of the anticipated effect.

It is an object of the present invention to provide a method for treating a closed thin film in which the above method is further improved in view of the above-mentioned manufacturing conditions to further increase the cleaning effect to achieve a significant improvement in treatment capacity.

The method and apparatus of the present invention suitable for such an object are directed to irradiating ultrasonic waves at right angles to the closed thin film pieces in the cleaning liquid at right angles to both sides of the thin film pieces in the cleaning liquid, and at the same time to transfer the thin film pieces. To increase the chance of contacting the circulating water flow in the closed thin film fragments by forcibly applying reverse water flow to the accompanying liquid flow in the conveying direction, and to remove foreign substances by washing with a pressure shower by a rotary screen. It has the characteristic of adding means, such as further promoting.

Hereinafter, the details of the present invention will be described in detail again with reference to the embodiments of the present invention shown in the accompanying drawings.

Hereinafter, the details of the present invention will be described in detail again with reference to the embodiments of the present invention shown in the accompanying drawings.

In FIG. 1, firstly, the present invention sends a synthetic resin waste thin film lump-like object visually screened to a crusher by a conveying conveyor 1 to the waste thin film lump shape described above with the crusher 2. After the object is crushed and cut, the second conveying means 3 may be sequentially supplied from the hopper 5 into the cleaning tank 4 to the crusher 2, and the second conveying means may be used. (3) is not limited to the use of a conveyor as shown in the figure, but may be replaced by a pressure feeding mechanism using a pressure feeder and a duct hose.

As shown in FIGS. 1 to 3, the cleaning tank 4 is provided with a guide car 6 under the hopper 5, and discharges the cleaning tank 4 from the lower position of the guide car 6. The net conveyor 13 having the elongation regulator 14 at the end toward the side is installed to be driven by the motor Mc over each of the rollers R ₁ , R ₂ , and R ₃ . The rear end is provided with the stirrer 9 driven by the motor 9M for propelling the liquid flow in the washing tank via the flow plate 7.

At the rear thereof, the heating liquid is injected into the front end of the cleaning agent supply plate 10 'connected to the cleaning tank 10 via a pump P ₁ and into the cleaning tank 4, and to adjust the liquid temperature. Holes are formed in the ends of the connected liquid pipes 11 'to control the cleaning liquid in the cleaning tank 4, and at the same time, pumps are provided to the drain tank 18 provided below the discharge side front end of the cleaning tank. P ₄₎ a hole is formed in the end portion 8 of the reflux pipe 21 is connected via a. On the other hand, the cleaning tank 4 is provided with at least one pair of ultrasonic vibrators 12 and two pairs in the drawing so that ultrasonic waves are irradiated toward each other and facing each other on both walls thereof, and are provided near the cleaning tank outside. The oscillator 12A is connected to the ultrasonic frequency oscillator 12A to drive the oscillator 12A, so that the liquid in the cleaning tank is vibrated by low-frequency oscillation around 30 K㎐, thereby releasing sludge and the like fixed to the closed film in the cleaning tank. Let's do it.

It is one feature of the present invention that the vibrator 12 is provided opposite to the side walls of both sides, and the remarkable effect can be improved for imparting vibration from below.

Moreover, in this washing tank 4, the arrangement | positioning of the said vibrator is also an important factor, and as another characteristic, the forced means which forms circulation water flow with respect to the liquid in a washing tank is provided.

In other words, the stirrer 9 at the rear of the cleaning tank described above is one of them, and again, via the pump P ₃ to the drainage tank 18 provided at the lower portion near the front of the cleaning tank 4 as opposed thereto. A connected pipe 19 is formed so that its tip is a spray nozzle 20 for injecting water from the front to the back of the cleaning tank 4 toward the rear of the cleaning tank to form a water flow in the opposite direction to the conveying direction. Doing.

Therefore, in the washing tank 4, as shown in FIG. 3, the water flow B and the guide car 6 which generate | occur | produce from the reflux by the stirrer 9 and the reflux pipe 21 generate | occur | produce. Water flow (C) Circulating water flow occurs as indicated by E by each of the water flows of the reverse water flow D generated by the above-described injection nozzle 20, which exists around the ultrasonic vibrator 12, It serves to further enhance the effect of ultrasonic cleaning.

This washing tank 4 has the same role as above, but also agglomerated to be settled by agglomeration of various mud, sand, stones, pieces of iron, etc. that settle through the ear portion of the net conveyor 13 at the lower part thereof. The jaw 15 is arranged and installed, which is provided with a screw conveyor 17 on one side thereof so that the settled sludge described above is discharged from the discharge end of the conveyor 17 to the lower tank 16. It is intended to accumulate.

In addition, these sludge to be integrated is provided with a pipe so that the sludge is collected together with the sludge taken out from each part along the sludge agglomeration tank disposed separately by the pump (P ₂ ).

The cleaning tank 4 is as described above, but the thin film washed in the cleaning tank 4 described above through the thin film-water mixing tank 22 in front of the cleaning tank 4 can be further cleaned. A rinse washing device is arranged.

The rinse-cleaning apparatus is usually comprised of the rotary screen 23, and is provided with the cylindrical net and the water spray means 24 which injects the washing water with respect to the thin film in a cylinder. The water injection means 24 is usually connected to a storage tank separately arranged in the present invention in order to enhance the series of water supply systems of the present invention, although any water source can be used.

In FIG. 1, reference numeral 25 denotes a sump of the rinse washing apparatus.

The closed thin film thus rinsed is then regenerated by a series of take-out mechanisms which are subsequently installed in the above-described rinse washing apparatus.

In the example shown in figure, the apparatus formed from the conveyor 25, the guide member 27, the drain member 28, the pressure blower 29, and the cyclone 30 is used as such an extraction mechanism, and finally the regenerated thin film which was dried It is taken out from the cyclone 30 as ash. Here, each member is a device known in the art, it can be easily designed by those skilled in the art.

On the other hand, the above-described apparatus of the present invention is used in conjunction with the various wastewater treatment apparatus is installed in parallel, and the portion shown in the lower part of FIG. 1 is such a wastewater treatment apparatus.

Here, the storage tank 31, the first settling tank 32. The second settling tank 33 and the sludge tank 34 are provided respectively, and the clear liquid of the upper part of each settling tank 32 and 33 is returned to the storage tank 31, and each of the above-described washing rinsing washings is carried out by a pump. At the same time, the sediment is transferred from the aforementioned settling tanks 32 and 33 to the concentration tank 35 and discharged with or without a pump.

In addition, sludge collected in the sludge tank 34 is provided with a deadener in the deadlock storage tanks 36 and 37 each equipped with a stirring device as appropriate, gradually stirring as it is stirred in the stirring device 34a. Deadlock

However, these wastewater treatment devices are not necessarily limited to the above-described device configuration, and of course, the design can be changed as appropriate.

In the above-described series of apparatuses, the following case of washing the synthetic resin waste thin film will be described. First, hot water heated by the boiler 11 is first introduced into the washing tank 4, and then the appropriate amount from the washing tank 10 is removed. An amount of detergent is added to prepare a cleaning liquid.

At this time, when injecting water, heat properly. Although the temperature of the cleaning liquid according to the ultrasonic cleaning does not change uniformly depending on the importance of chemical cleaning power or physical cleaning power, the maximum value of physical cleaning power is generally recognized at about 50 ° C in the case of water. Therefore, the effect of the ultrasonic vibration is maximized when the temperature is about 50 ° C. Here, it is preferable to wash at about 40-45 ° C in consideration of the relationship with the heat resistance temperature of the vibrator of the present invention.

That is, the liquid temperature varies depending on the type, composition, degree of aging of the thermoplastic synthetic resin forming the closed thin film, and the degree of deformation or the degree of agglomeration, fixation, or entanglement of the closed thin film lump-like object, but is formed and fixed on the closed thin film. Since the deformation of wrinkles, wrinkles, and the like is spread out and the liquid temperature is virtually extinguished, a temperature of about 40-45 ° C is preferable for polyvinyl chloride, and about 30-35 ° C for high-pressure polyethylene. However, this is not necessarily fixed and depends on each condition.

In this way, if the inside of the washing tank 4 is kept at an appropriate temperature, the waste thin film lump-like object is crushed by the crusher 2, and the waste thin film is introduced into the washing tank by the guide vehicle 6 through the hopper 5 sequentially. Supply.

At this time, the inside of the washing tank is the same as the arrow shown in Figs. 3 (B) and (C) by the operation of the guide car 6 and the water circulated by the overflow tank 18 by the overflow tank and the stirrer 9. While the water flow is generated, the water back path D in FIG. 3 is generated by the injection of water from the front injection port 20.

In this state, by operating the ultrasonic frequency oscillator on both sides and irradiating the ultrasonic thin film piece of about 30 K㎐ through the ultrasonic vibrator 12, the lungs carried by the net conveyor B in the cleaning tank 4 move. While the thin film is cleaned by ultrasonic waves, it is sufficiently retained in the washing tank by the forced circulation water flow by the aforementioned water flows (B), (C) and (D), and is effectively cleaned.

The closed thin film thus injected is washed for about 3 minutes in the washing tank 4, but is taken out of the washing tank by the above-described net conveyor 13 and sent to the next thin film-water mixing tank 22, followed by a rinse washing process. Cleaning is performed by the pressure shower of the in-line rotary screen 23, and it is carried out from the cyclone 30 through a series of taking-out mechanism.

On the other hand, in the wastewater treatment, sludge etc. which sank in the washing tank 4 mentioned above are gathered in the flocculation tank 15 of the lower part through the ear | edge part of the net conveyor 13, and a screw tank conveyor 17 is used from time to time. After being discharged to (16), it is sent to the drainage basin 34 and treated with wastewater.

In addition, the above-mentioned wastewater in the thin film-water mixing tank 22 and the rotary screen 23 is separately used as treatment water through the wastewater treatment through the drainage tank 25. In this case, the water in each of the drainage tanks is subjected to wastewater treatment by the coagulation sedimentation method in the first and second sedimentation tanks 32 and 33, and then circulated as treatment water to each device through the filtration tank.

In particular, the lumps of the thin film pieces cut in the above-described crushing process are electrostatically formed in the form of irregular lumps in which ribbon-shaped thin film pieces of about 50 mm width are agglomerated, and thus are not easily dissociated and fixed with various complex deformations. Impurities and sewage are firmly adhered, including contaminants. Therefore, it is extremely difficult to completely separate and remove their foreign substances by conventional methods. However, according to the method of the present invention, the lump-shaped waste thin film pieces are softened by the liquid temperature at the time of being introduced into the cleaning liquid, and are rapidly lumped by the aforementioned forced circulation water flow of the heating liquid, and are softened again while moving in the liquid. Ultrasonic energy is irradiated in the state where the strain is unfolded and virtually eliminated. In addition, the cleaning effect of the ultrasonic wave is doubled by the liquid temperature of the cleaning liquid, and the sludge adhered to the film surface rapidly separates and drops off at the time of the second to settle at the bottom of the cleaning tank. To be deposited. In addition, the oil can also be removed by the degreasing action of the ultrasonic energy and can be completely removed by the use of a detergent.

As is apparent from the above description, the method of the present invention not only significantly improves the cleaning effect of the ultrasonic wave according to the heating rise temperature of the cleaning liquid, but also helps to disassemble the lump-like object of the closed thin film pieces formed of the thermoplastic synthetic resin. It has the side effect that it can remove all sewage and contaminants completely in a short time by showing the synergistic effect that it spreads more easily to form more clean, and also sterilize microorganisms attached to the thin film at the same time. Therefore, the thin film fragments sent out from the foreign material separation process to which the method of the present invention is applied are cleaned in a very clean state, and therefore, no additional water washing is required again, and the wear and tear of mechanical parts such as screws of the dehydrator is also worn in the subsequent dehydration process. It is possible to improve the processing capacity and to preserve the high quality of the product flap.

Next, experimental examples of the present invention will be described.

Experimental Example

The foreign material separation of the polyvinyl chloride closed thin film was performed using the apparatus as shown in Figs. 1-4 having a washing tank having a width of 1 m, a length of 4 m, and a depth of 1 m. 1.5 liters of a commercially available alkaline cleaner was added to the washing tank, and then the stirrer was operated while spraying from the injection port to circulate the washing liquid. 20 kg of the lump-like object of the pulverized vinyl chloride thin film fragment was thrown in at the time of 45 degreeC of liquid temperature, 30 KPa of ultrasonic waves were irradiated, and wash | cleaning was performed for 3 minutes.

The waste thin film lump-like object before the washing tank contained 47.1% of foreign matters such as soil and sand with respect to the weight of the thin film, but the amount of foreign matter remaining after washing was reduced to 0.4% and the foreign matter removal rate was 99.2%.

Next, the cleaning effect by this apparatus can be numerically examined, and as a result of various studies, the spectral transmittance of the thin film was determined.

As a result, the light transmittance of the thin film was found to be stable in the infrared portion from the visible portion to 0.5μ without significant difference. Since the transmittance of the thin film should be measured at a stable wavelength, the spectroscopic wavelength was measured at 600mμ.

This transmittance is large and the difference in value is caused by the state of the thin film, for example, if the film is wet, the surface is scratched or wrinkled, causing a decrease in the light transmittance. It was confirmed that the transmittance of the raw material thin film was 40%, which was about 45% in terms of the cleaning rate, and was 95-96% in the cleaning rate after performing ultrasonic cleaning for about 60 seconds according to the present invention.

Here, the cleaning rate is converted from the transmittance by making the transmittance of the new thin film 100%.

In addition, compared with the known technology, the conditions as described above except for aeration in three air inlet pipes installed in the bottom of the tank using a conventionally known aeration flow-flow foreign matter separation tank and agitating the liquid. The foreign matter removal rate was 96.2%, and the cleaning rate in terms of permeability was about 70-73%.

Moreover, when the ultrasonic cleaning which does not have the system of increasing the residence time by the flow of the forced circulation water of the present invention was performed under the above conditions, the cleaning rate in terms of the transmittance had a significant difference of about 83-85%.

As described above, according to the present invention, the ultrasonic cleaning process is a water type cleaning tank, and the processing capacity of about 3 times more than that of the conventional flint is possible, and the efficiency of the cleaning ability can be improved, and the device area is also improved. It is about half the degree, and furthermore, since the cleaning is mainly performed by ultrasonic energy, the power used is also extremely reduced as compared with the prior art, thereby achieving energy saving of power.

In particular, even the cleaned thin film can be obtained by the circulating flow of the gauze in the cleaning degree and subsequent rinsing, which results in significantly higher foreign matters with less foreign matter than the conventional method, and enables extensive regeneration and effective use, resulting from conventional landfill and incineration. Extreme expectation is put on prevention of pollution.

In addition, in the case of the present invention, in the wastewater treatment, the washing and draining water can be adopted by the coagulation sedimentation method, and all the circulating materials are used.

In this way, the quality of the synthetic resin thin film can be improved and maintained, and ultrasonic cleaning is more reliably applied to the thin film due to the increase of the tank residence time due to the circulation movement of the water stream and the subsequent rinsing washing. As the technical improvement of the effective utilization of various thermoplastic synthetic resin closed films, the effect is extremely large, and practical use is expected in the future.

Claims (4)

The closed thin film lump-like object formed of thermoplastic synthetic resin is immersed in the cleaning solution after crushing, and the pulverized lump-like object of the pulverized closed thin film described above is utilized by irradiating ultrasonic waves to the closed thin film pieces in the liquid and using the flow of the cleaning solution. In the method of softening while immersing in a liquid and spreading and substantially removing deformation such as wrinkles and wrinkles formed on the closed thin film, and separating and removing foreign matter on the thin film, the ultrasonic wave is closed thin film. The pieces are irradiated oppositely from each other on both sides, and are washed while forcibly forming the circulating water in the front and rear directions in the thin film conveying direction in the cleaning liquid, and then rinsing and washing again with a pressure shower. Waste film treatment method for reclaimed raw materials. The waste thin film processing method for reclaimed raw materials of Claim 1 whose temperature of a washing | cleaning liquid is 40-45 degreeC. The waste thin film processing method for reclaimed raw materials of Claim 1 or 2 whose waste thin film which consists of thermoplastic synthetic resins is a polyvinyl chloride thin film. A device for crushing the plastic waste thin film mass to be treated (2), Apparatus 3 for conveying and supplying the waste thin film crushed by the apparatus to the washing tank 4, a washing apparatus for washing the waste thin film in a liquid, and an apparatus 23 for rinsing and washing the waste thin film again by the apparatus. And the cleaning apparatus includes a cleaning tank 4 containing a cleaning liquid therein, the cleaning tank 4 having ultrasonic vibrators 12 facing each other on both side walls thereof, and further including a cleaning tank 4. On the inlet side, a liquid propulsion stirrer 9 is provided, and on the outlet side, a device 20 for injecting liquid in the reverse direction to the closed thin film conveying direction, and inside the washing tank 4, the washing tank outlet from the lower part of the supply device 3; The net conveyor (13) is provided, the lower part of the thin film processing apparatus for recycled raw material, characterized in that it has a discharge device (17) for discharging the separated sludge.

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