JP2001164036A - Method of peeling off paint from paint-coated resin articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the action to strip off the coated paint by combining the chemical peeling action by using a coated paint-peeling solution with the physical peeling action by mutual grinding. SOLUTION: The barrel that contains a large amount of resin pieces A, crushed product of painted resin articles and permits fluid to flow in and out is soaked in the paint-peeling liquid (a) and the barrel is rotated to give the fraction force to the coated faces of the resin pieces whereby the coated paint is peeled off. Then, the barrel 2 is transferred to the water-washing machine and rotated to wash the paint-peeling solution (a) on the resin pieces A with water, further transferred to the drying unit where the resin pieces A are dried with warm air as the barrel is rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art In recent years, in the treatment of waste resin products, it is difficult to secure landfills by landfill disposal, and incineration involves the generation of harmful substances such as dioxin, causing serious social problems. Therefore, there is an urgent need for a recycling process for recycling a waste resin product into a processable resin raw material. And, in the above-mentioned regeneration treatment, impurities applied to the waste resin product,
That is, removal of the paint film is indispensable, and if the removal of the paint film is incomplete, it is impossible for the regenerated resin to reproduce the properties and capabilities originally possessed.

In addition, many defective parts generated in the painting process in the production of various resin products are discarded. However, if the paint is removed, it can be reused as a resin material again.

[0003] The present invention relates to a paint removing method suitable for removing paint in a resin product reprocessing step or removing paint of defective paint parts as described above, and particularly to a chemical method using a remover and a chemical method. The present invention relates to a method for removing paint from a coated resin product by combining physical methods.

[0004]

2. Description of the Related Art Conventional methods for removing paint from coated resin products include physical methods, chemical methods, and methods combining physical and chemical methods. As a physical method, there has been proposed a method in which various projecting materials such as sand, iron powder, and beads are projected onto an object (painted resin product) at a high speed, and the paint is crushed and peeled. Further, as a chemical method, a method has been proposed in which a coating resin is immersed in a release agent liquid suitable for the characteristics of a coating material, and the coating material is chemically decomposed and separated. Further, the method combining the physical method and the chemical method is so-called friend rubbing by immersing the crushed pieces of the coating resin product in the release agent liquid and stirring the crushed pieces of the coating resin with the release agent liquid by a stirrer. There has been proposed a method of causing (rubbing between coating resins) to promote the peeling action.

[0005]

However, in the above-mentioned physical method, it is difficult to separate the blasting material from the resin after the peeling process, and the blasting material is evenly projected on the resin products having various shapes. Therefore, there is a problem that a large amount of manual work is required, and a large amount of coated resin products cannot be processed.

[0006] In the above-mentioned conventional chemical method, there is a great difference in processing time, for example, from tens of minutes to several hours, depending on the type of paint and the type of resin, and various conditions such as temperature. However, there is a problem that it is difficult to execute the processing when the processing time is long.

Furthermore, the method of combining the physical method and the chemical method of the above-mentioned conventional example stirs in a state where the crushed pieces of the coating resin are suspended in the release agent liquid, so that the rubbing effect is small and it takes a long time. There is a problem that if the equipment is capable of processing a large amount, it becomes expensive.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method of removing paint from a coated resin product which solves the problems.

[0009]

According to one aspect of the present invention, there is provided a method of removing paint from a coated resin product, the method comprising the steps of: The container is immersed in a paint remover, and the container is moved to apply a frictional force to the application surface of the crushed material to remove the paint.

According to a second aspect of the present invention, there is provided a method for removing paint from a coated resin product according to the present invention, wherein a container is formed in a basket shape and a piece of the coated resin is moved inside the container. In this case, an obstacle-providing material is provided which is an obstacle.

Further, according to a third aspect of the present invention, there is provided a method for peeling paint of a coated resin product according to the present invention, wherein a container containing a large number of crushed pieces of the coated resin product and capable of flowing in and out of a liquid is immersed in the paint peeling liquid. After moving the container to apply a frictional force to the coating surface of the crushed material to peel off the paint, the container is moved to a water washing device, and the container is moved to wash the paint peeling liquid of the crushed material, and further, The method is characterized in that the container is moved to a drying device and dried by applying warm air while moving the container.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a peeling device for realizing a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, FIG. 1 of the accompanying drawings is a schematic front view showing the entire paint peeling apparatus, FIG. 2 is a plan view of the same, FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2, and FIG.
FIG. 5 is a perspective view of the barrel, and FIG.
7 is a cross-sectional view of the barrel showing a used state.

First, a description will be given of a paint stripping facility for executing a paint stripping method for a coated resin product. As shown in FIG. 1 and FIG. 2, the paint peeling equipment 1 is in a state in which a barrel 2 which is a basket-like container that accommodates a large number of painted resin pieces A (see FIG. 7) is suspended. A mounting device 4 for mounting on a suspending member 3 for rotating by means of, and a peeling liquid tank 5a containing a paint peeling liquid a inside thereof, and a barrel 2 mounted on the suspending member 3 and suspended and rotated. Stripper 5 dipped in a paint stripper a
A washing tank 6a containing washing water b therein is provided, and the barrel 2 attached to the hanging member 3 and rotating while being suspended is put in the washing water b in the washing tank 6a. An apparatus 6, a drying device 7 mounted on the hanging member 3 and applying hot air to the barrel 2 that rotates while being suspended, and a detaching device 8 for detaching the barrel 2 from the hanging member 3. Are arranged in this order.

As shown in FIGS. 5 to 7, the barrel 2 has a cylindrical shape having a hexagonal cross section, and a supporting frame 9 having a net material 9a stretched on each of five surfaces except one of the six surfaces. Consisting of a pair of end plates 11 fixed to both ends of the support frame 9 and projecting the central axis 10 outward, respectively, and a lid 12 for opening and closing one surface on which the net material 9a is not stretched. I do. On the surface of each of the end plates 11, a driven wheel 11a on which a tooth 18c to be described later is hung is provided.

As shown in FIGS. 5 to 7, the lid 12 is constructed by extending a net 13 a on a frame 13, and is pivotally attached to the support frame 9 by two hinges 14 and supported by a fixture 15. It is configured to be detachable from the fixture 16 on the frame 9 side. As shown in FIGS. 6 and 7, the rolling of the resin piece A is positioned inside the six linear portions extending in the longitudinal direction of the support frame 9 at positions corresponding to the six corners of the end plates 11. The plate-shaped obstacle-imparting members 17 are integrally provided so as to be obstacles. The obstacle imparting material 17 has a function of appropriately suppressing the rolling of a part of the resin pieces A and stirring the many resin pieces A evenly.

As shown in FIG. 1 and FIG.
Can be raised and lowered by driving the hoist device 3a as required, and can be moved horizontally in the raised state. That is, the hanging member 3 to which the barrel 2 is mounted by the mounting device 4 is connected to the hoist device 3a.
After moving up and moving horizontally, it descends at a predetermined position and enters the peeling device 5, and from the peeling device 5 to the washing device 6, from the washing device 6 to the drying device 7, and from the drying device 7 The same operation as described above (lift,
(Horizontal movement, descending).
Further, a plurality of suspension members 3 perform the above operation at the same time, and are configured to circulate back to the mounting device 4 after the barrel 2 is released by the release device 8.

As shown in FIGS. 3 and 4, the suspension member 3 includes a driving rotary shaft 18 provided with a driving gear 18a at the outer end thereof, and a pair of driven A pair of transmission belts 19 spanning wheels 11a provided on the surfaces of both end plates 11 of the wheel wheel 18b and the barrel 2, and a pair of support members rotatably supporting the center shaft 10 of each end plate 11. 20 are provided. The driving gear 18a is connected to the driving chains 23 and 34 of the peeling device 5 and the washing device 6 described later or the driving device 4 of the drying device 7.
1 for receiving a rotational force by connecting the center shaft 10 of the barrel 2 to each support 20 so as to be rotatable and receiving the rotational force while the barrel 2 is suspended. The barrel 2 rotates via the gear 18a, the pair of driven wheels 18b, the transmission belt 19, and each wheel 11a.

As shown in FIGS. 1 to 3, the peeling device 5
A plurality of barrels 2 (5
The stripping liquid tank 5a is formed so as to be accommodated and filled with the coating stripping liquid a, and one end side (the mounting device 4 side) of the stripping liquid tank 5a completely immerses the barrel 2 in the stripping liquid a. The immersion tank is configured as described above. Further, a strainer 21 for sequentially discharging the overflowing paint stripping liquid a is provided at the one end side. The paint remover a discharged from the strainer 21 is returned to the remover tank 5a as needed. A driving device 2 is provided above the side wall of the stripping solution tank 5a.
2, the drive chain 23 circulating and rotating is arranged to extend in the lateral direction. The drive chain 23 is connected to the drive gear 18a of the suspension member 3 to drive the drive shaft 1
8, for rotating the barrel 2 via a pair of driven wheels 18b, a transmission belt 19, and each wheel 11a. Further, the stripping device 5 is provided with a stripping solution filtering device 24 which is located outside the stripping solution tank 5a and is adapted to take out the coating stripping solution a in the stripping solution tank 5a, filter it, and then return it. In FIG. 1, reference numeral 25 denotes a heater for warming the paint remover a to a predetermined temperature in order to enhance the peeling action.

As shown in FIG. 3, the bottom 2 of the stripper tank 5a
6 is inclined in the width direction, a drain 27 is provided on a side wall corresponding to the lowest portion, and immediately above the bottom 26, the stripping liquid filtering device 24 for stirring the coating stripping liquid a is provided. A stirring pipe 28 communicating with an inlet (not shown) of the paint stripping liquid a after the filtration is disposed.
A plurality of discharge holes 28a are provided in the stirring pipe 28, and the paint stripping liquid a in the stripping liquid tank 5a is stirred by ejecting the coating stripping liquid a from here. The drain 2
The paint stripping liquid a discharged from 7 is configured to flow into the liquid groove 29.

As shown in FIG. 1, FIG. 2 and FIG. 4, the water washing device 6 is arranged at a position following the peeling device 5 and includes a plurality of barrels 3 (three barrels) suspended by the suspending member 3. A) a washing tank 6 which is formed so as to be able to be accommodated, and has a liquid draining section 30 and a first washing section 31 and a second washing section 32, each of which is filled with washing water and separated from each other;
a. In addition, the draining section 30, the first washing section 3
1, a driving machine 3 is provided outside the side wall corresponding to the second washing section 32.
The drive chain 34 circulating and rotating by 3 is arranged to extend in the lateral direction. The drive chain 34 is connected to the drive gear 18a of the suspension member 3 like the drive chain 23 of the peeling device 5 to drive the drive shaft 18, the pair of driven wheels 18b, the transmission belt 19, and the pair of wheels. It is for rotating the barrel 2 via 11a.

Further, the water washing device 6 is provided with a filter 35 for separating the washing water b and the paint removing liquid a. The separated washing water b and the paint removing liquid a are respectively separated into the first washing section 31 and the peeling liquid. The apparatus is returned to the stripping solution tank 5a of the apparatus 5. The filter 35 is based on a known technique of separating a passing molecule and a non-passing molecule by using a difference in molecular weight between the cleaning water b and the paint removing liquid a.

As shown in FIG. 4, the bottom portion 36 of the first washing portion 31 is inclined in the width direction, and a drain 37 is provided on a side wall corresponding to the lowest portion. The filter 3 passes through a water groove 38 outside the tank 6a.
It is sent to 5. Further, similarly to the first washing section 31, the bottom (not shown) of the second washing section 32 (not shown) is used.
Also, a drain (not shown) is provided on the side wall corresponding to the lowest part, and the washing water b flowing out from this is sent to the filter 35 through a water groove 38 outside the washing tank 6a. It is. Further, the first washing section 31,
Similarly to the second washing section 32, the bottom (not shown) of the liquid draining section 30 is also inclined in the width direction, and a drain (not shown) is provided on a side wall corresponding to the lowest portion. Paint remover a taken out of this drain (not shown)
Is configured to be sent to the stripping liquid tank 5a via a separate liquid groove (not shown).

As shown in FIG. 1 and FIG.
Is a device in which the washed resin piece A is rolled and dried in the barrel 2 which is the basket-shaped container in a state where hot air is blown thereon, and is disposed at a position following the water washing device 6 and is suspended by the suspending member 3. It has a ventilation body 7a formed so as to be able to accommodate one lowered barrel 2 and a blower 40 with a heater 39 for blowing hot air toward the ventilation body 7a. In FIG. 2, reference numeral 41 denotes a driving device for rotating the driving gear 18a of the suspension member 3.

The method for removing paint from a coated resin product according to the present embodiment is performed by the following steps 1 to 9.

(Step 1) Lid 1 of barrel 2 as a basket-shaped container
2 is opened, and an appropriate amount of the coating resin piece A is contained therein, usually 300
Then, the barrel 2 is suspended from the suspension member 3 in the mounting device 4. In this suspending operation, the pair of center shafts 10 of the barrel 2 are supported by the respective supports 20 of the suspending member 3.

(Step 2) The hoist device 3a is driven to raise the suspending member 3 from which the barrel 2 is suspended, and is horizontally moved to the immersion tank which is one end of the peeling tank 5a, and then the suspending member 3 is lowered. Is completely immersed in the paint stripper a, and the paint stripper a is applied to the painted surface.

(Step 3) Next, the hoisting device 3a is driven to raise the suspending member 3, move to the first section of the peeling tank 5a and descend, and also drive the driving gear 18a of the suspending member 3. The barrel 2 is rotated by being connected to a drive chain 23 circulating by the machine 22. And
In this lowered position, almost two-thirds of the barrel 2 is immersed in the paint remover a, and the coating resin pieces A in the barrel 2 roll while immersed in the paint remover a, and rub against each other. A so-called rubbing state is established, and a new paint removing liquid a is always supplied to the painted surface. in this way,
The chemical peeling action of the paint peeling liquid a and the physical peeling action of friend rubbing together ensure that the paint peels off from the coating resin piece A. In addition, since the obstacle imparting member 17 that hinders the rolling movement of the coating strip A is provided in the barrel 2, the above-mentioned rubbing action is further enhanced.

(Step 4) After the above operation is performed for a predetermined time in the first section of the peeling tank 5a, the drive gear 18a is removed from the drive chain 23, the suspension member 3 is slightly raised, and a predetermined distance is set in the horizontal direction. It moves to the second partition, connects the driving gear 18a to the driving chain 23 again, and performs the same peeling operation as described above. Further, the suspending member 3 is moved horizontally to perform the same peeling operation twice as described above.

(Step 5) The hoist device 3a is driven to raise the suspending member 3 from which the barrel 2 is suspended, and is horizontally moved to the liquid draining section 30 at one end of the washing device 6, and then the suspending member 3 is lowered. And the driving gear 1 of the suspending member 3
8a is connected to the drive chain 34 to rotate the barrel 2. Then, by rotating the barrel 2 at this lowered position for a predetermined time, the paint removing liquid a adhering to the resin piece A from which the paint has been removed is efficiently dropped.

(Step 6) The hoist device 3a is driven to raise the suspending member 3 from which the barrel 2 is suspended, and is moved horizontally to the first washing section 31 of the washing device 6, and then the suspending member 3 is lowered. , The driving gear 18a of the suspension member 3
Is connected to the drive chain 34 to rotate the barrel 2. In this lowered position, the entire barrel 2 is immersed in the washing water b, and the resin pieces A after the paint is removed in water.
To wash the paint remover a remaining on the surface with water.

(Step 7) Further, the connection between the drive gear 18a and the drive chain 34 is once released, and the hoist device 3a is driven to raise the suspending member 3 from which the barrel 2 is suspended. After the horizontal movement to the washing section 32, the suspension member 3 is lowered, and the drive gear 18a of the suspension member 3 is connected to the drive chain 34 to rotate the barrel 2. Similarly,
The resin piece A is washed with water.

The washing water b in the above steps 6 and 7 is mixed with the paint stripping liquid a when the resin piece A is washed with water, but when the mixing amount becomes a predetermined value or more, the drain 37 is opened. And remove the new washing water b into the washing tank 6
The washing water b filled and withdrawn into a is separated into a paint remover a and a wash water b by a filter 35, and the paint remover a
Is returned to the stripping tank 5a, and the cleaning water b is used as the new cleaning water b.

(Step 8) The suspension member 3 that suspends the barrel 2 containing the resin piece A that has completed the water washing operation is connected to the drive gear 1.
When the connection between the drive chain 8a and the drive chain 34 is released, the hoist device 3a is driven to descend into the housing 7a of the drying device 7, and the drive gear 18a of the suspension member 3 is connected to the drive unit 41 to rotate the barrel 2. Let it. Then, hot air from a blower 40 with a heater 39 is applied to the resin piece A that rolls in the barrel 2 and dried.

(Step 9) The suspension member 3 that suspends the barrel 2 containing the resin piece A after the drying operation is
The connection between 8a and the driving device 41 is released, and the hoist device 3a is driven to descend into the separating device 8, and the barrel 2 is separated from the suspension member 3. Then, the separated barrel 2 is transported to a predetermined place, the lid 12 is opened, and the resin piece A from which the paint is removed is taken out.

The above steps have been described for one barrel 2 in sequence. However, in practice, a large number of barrels 2 are sequentially put on this step for work. Specifically, it is possible to process 21 to 24 barrels in 8 hours.
When 300kg is stored per barrel, 6300-72
The processing of 00 kg becomes possible.

The present invention is not limited to the above embodiment. For example, in a paint removing facility, the mechanism for rolling the resin piece A in the barrel 2 is similar to the above embodiment. Instead of doing, it may be configured to swing.

[0037]

As described above, according to the first aspect of the present invention, the chemical stripping action by the paint stripping solution and the physical stripping action of friendship between the coating resin pieces by rotation are achieved. Because of the combination, the effect of removing the paint from the coating resin piece is high.

According to the second aspect of the present invention, the chemical stripping action of the paint stripping liquid is combined with the physical stripping action of rubbing the coating resin pieces by rotation. Since the peeling action of the paint on the resin pieces is high and a barrel provided with an obstacle-providing material is used,
It is possible to effectively perform friend rubbing, enhance the peeling effect, and because it is a basket-shaped container, the effect that the paint peeled from the coating resin piece can go out of the container and can be easily separated. Play.

According to the third aspect of the present invention, the chemical stripping action of the paint stripping liquid is combined with the physical stripping action of rubbing the coated resin pieces by rotation. In addition to the high peeling effect of the paint on the resin pieces, a large number of resin pieces from which the paint has been peeled are rolled in a container into which water can flow out and the paint remover is washed with water. In addition to removing the impurities, it is also possible to remove the washing water containing the paint stripper and separate the paint stripper, thereby reducing the consumption of the paint stripper, and furthermore, washing the water-washed resin pieces, Rolled in the container and dried by applying warm air, only resin pieces remain in the container and impurities are discharged out of the container, so that this resin piece can be reused as it is as a resin raw material or the like. Unlikely to.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an entire paint removing apparatus.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged sectional view taken along line BB of FIG. 2;

FIG. 5 is a perspective view of a barrel.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a sectional view of the barrel showing a use state.

[Explanation of symbols]

 Reference Signs List a resin strip b paint stripping liquid c washing water A resin strip 1 paint removal equipment 2 barrel 3 hanging member 3a hoist device 4 mounting device 5 stripping device 5a stripping tank 5b heater 6 washing device 6a washing tank 7 drying device 7a house 8 Apparatus 9 Support frame 9a, 9b Net material 10 Center axis 11 End plate 11a Wheel 12 Lid 13 Frame 14 Hinge 15 Fixing tool 16 Fixed tool 17 Obstacle applying material 18 Drive rotating shaft 18a Drive gear 18b Drive wheel 19 Drive belt 20 Support 21 Strainer 22, 33, 41 Driving machine 23, 34 Drive chain 24 Stripping liquid filtration device 25 Heater 26, 36 Bottom 27, 37 Drain 28 Stirring pipe 28a Discharge hole 29 Liquid groove 30 Drainage part 31 First rinsing part 32 2nd washing section 35 filter 38 water groove 39 heater 40 blower

Claims (3)

[Claims] 1. A container accommodating a large number of crushed products of a coated resin product, through which a liquid can flow in and out, is immersed in a paint remover, and the container is moved to apply a frictional force to an application surface of the crushed material. A method for removing paint from a coated resin product, wherein the paint is peeled off. 2. The method for removing paint from a coated resin product according to claim 1, wherein the container is formed in a cage shape, and an obstruction imparting material that hinders movement of the coating resin piece is provided inside the container. 3. A container containing a large number of crushed products of a coated resin product, through which liquid can flow in and out, is immersed in a paint remover, and the container is moved to apply a frictional force to the coating surface of the crushed product. After the paint is peeled off, the container is transferred to a water washing device, the container is moved to wash the crushed paint removing liquid with water, and the container is further moved to a drying device, and the container is moved to generate hot air. A method for removing paint from a coated resin product, comprising applying and drying.