JP2000326326A - Reprocessing equipment for coated resin parts - Google Patents

Abstract

(57) [Problem] To provide an apparatus capable of continuously and efficiently performing processes from material input to preheating treatment, coating film peeling treatment, and cooling separation treatment. SOLUTION: A preheating tank 1, a stirring tank 2 and a cooling and separating tank 3 are stacked to form a three-stage facility. In the preheating tank 1, the crushed pieces P of the resin part with the coating film are heated by the heater 8 while being stirred by the blades 6. The pre-heated crushed pieces P are transferred to the stirring tank 2 with the shutter 12 opened. In the agitation processing tank 2, the coating film on the surface is peeled off while the temperature is raised by the frictional heat generated by the agitation of the blades 10. The crushed pieces P after peeling the coating film are transferred to the cooling separation tank 3 by opening the shutter 29 and cooled by the blower 27 while being stirred by the blades 19, and at the same time, the crushed pieces P and the peeled coating film pieces are passed through the screen 18. And sieve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reprocessing a coated thermoplastic resin part, and more particularly, to a coated resin part waste material such as an automobile bumper when reusing the same. The present invention relates to a reprocessing apparatus for removing a film.

[0002]

2. Description of the Related Art As a technique for regenerating a thermoplastic resin part represented by an automobile bumper, a metal having a size of, for example, about 10 mm on a side without removing a coating film after removing a metal or other dissimilar parts is used. In addition to the method of re-grinding and granulating, and reusing it as a raw material for lower-grade parts whose appearance quality is not so problematic, in order to improve the reclaim quality, the above-mentioned crushed pieces are treated with a solvent such as alkali or organic hydrochloric acid. And a method in which the crushed pieces are put into a predetermined treatment tank and stirred at high speed to peel the coating film (Japanese Patent Laid-Open No. 11-58).
No. 383).

[0003] In the above method of peeling the coating film by stirring, the temperature of the resin itself is raised to a temperature immediately before the resin itself softens or melts due to friction between the crushed pieces or the heat of collision caused by the stirring, and the temperature is increased. Basically, the coating film is peeled off by bringing the crushed pieces, whose surface coating film is easily peeled off, into contact with each other in a form such as barrel finish polishing.

[0004]

In the method of peeling a coating film using a solvent, the treatment of the solvent after the treatment becomes a problem, and washing with water is necessary after the coating film is peeled off. This is undesirable.

[0005] Further, in the method of peeling the coating film only by stirring, the peeled coating film and the resin cannot be completely separated in the processing tank because of the simple batch processing,
After the treatment, the work of separating the coating film and the resin must be performed in another step, so that the number of steps and the cost are inevitably increased.

[0006] In addition, the coating film once peeled is continuously stirred together with the crushed pieces during the processing time.
It is expected that the peeled coating film not only prevents the unpeeled crushed pieces from peeling off as a cushion but also causes the once peeled coating film to adhere to the crushed pieces again. Efficiency deteriorates and the processing time becomes unnecessarily long, which is not preferable.

Further, when the treatment time is long as described above, the degree of crushing not only the coating film on the surface of the crushed pieces but also the resin layer itself into a powdery form increases, and the original purpose of resin recovery is Efficiency will be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the efficiency in a short period of time without incurring the problem of upsizing of equipment and secondary treatment of waste liquid. It is an object of the present invention to provide a reprocessing apparatus capable of removing a coating film.

[0009]

According to the first aspect of the present invention, a thermoplastic resin part to which a coating film has adhered is crushed to a predetermined size in advance, and the crushed pieces are stirred in a treatment tank to form a coating film. A preheating tank for preheating the crushed pieces by a heating means, and a stirrer for stirring the crushed pieces after the preheating to peel off the coating film. The processing tank is disposed adjacent to the upper and lower two-stages so that the crushed pieces after the preheating can be directly transferred from the preheating tank to the stirring processing tank.

[0010] For example, a stirring tank is disposed above the preheating tank with the preheating tank being on the lower side, and the preheated crushed pieces are transferred from the preheating tank to the stirring processing tank above it. I do. In this case, a window for transferring the crushed pieces and a shutter for opening and closing the crushed pieces are provided between the preheating tank and the stirring processing tank, and the window is normally closed by the shutter. During the transfer, the window is opened to enable the transfer of the crushed pieces from the preheating tank to the stirring tank.

As a heat source for preheating in the preheating tank,
Any material can be used as long as the crushed pieces can be preheated to a temperature close to the coating film peeling treatment temperature. For example, any one of an electric heater type, a hot air type, an infrared type and the like can be used alone or in combination.

Therefore, according to the first aspect of the present invention, in continuously performing the coating film peeling process of the crushed pieces which have been crushed to a predetermined size in advance, the preheating and the stirring treatment of the crushed pieces in the preheating tank are performed. The coating stripping treatment of the crushed pieces in the tank was performed in parallel, and when the crushed pieces that had finished the coating stripping treatment in the stirring tank were taken out of the stirring tank, the preheating in the preheating tank was completed. The crushed pieces are immediately transferred to the stirring tank, and at the same time, unprocessed crushed pieces are put into the preheating tank by a predetermined conveying means or the like.

If the crushed pieces are preheated prior to the coating film peeling treatment in the stirring treatment tank, the crushed pieces already have thermal energy when transferred to the stirring treatment tank. The temperature of the crushed pieces rapidly rises simultaneously with the start of the coating film peeling treatment by stirring.

According to a second aspect of the present invention, the preheating tank and the stirring processing tank according to the first aspect of the present invention are each a disk-shaped stirring tank that covers the inner bottom surface of the cylindrical processing tank body. In the preheating tank, the crushed pieces are preheated while being agitated by the rotation of the blades in the preheating tank. On the other hand, in the agitation processing tank, the coating film is peeled off while the crushed pieces are agitated and heated by the rotation of the blades. It is characterized by being.

Therefore, in the invention according to the second aspect, in both of the preheating tank and the stirring tank, the stirring is performed by the rotary blades. In the preheating tank, the crushed pieces are evenly distributed by the stirring. While being preheated, a uniform coating film peeling treatment is similarly performed in the stirring treatment tank by the stirring treatment.

According to a third aspect of the present invention, there is provided the cooling apparatus according to the second aspect of the present invention, wherein the preheating tank and the stirring tank are provided with a cooling separation tank, and the three tanks are arranged adjacent to each other in three upper and lower stages. The cooling separation tank has a function of separating the crushed pieces and the release coating film while cooling the crushed pieces after the coating film separation processing, while the cooling separation tank has a function of separating the crushed pieces from the stirring processing tank to the cooling separation tank. It is characterized in that the crushed pieces can be directly transferred.

The arrangement of each treatment tank is, for example, a preheating tank, a stirring treatment tank, and a cooling separation tank in order from the bottom, and the crushed pieces are disposed between the stirring treatment tank and the cooling separation tank in the same manner as in the case of the two-stage type. A transfer window and a shutter shall be provided.

Therefore, according to the third aspect of the present invention, not only the preheating of the crushed pieces in the preheating tank and the coating film peeling treatment of the crushed pieces in the stirring treatment tank but also the coating film peeling treatment in the cooling separation tank are performed. The process of cooling and separating the crushed pieces and the release coating film is also performed in parallel. Then, the crushed pieces that have been subjected to the coating film peeling treatment in the stirring treatment tank are immediately transferred to the cooling separation tank, where the cooling separation treatment is performed.

According to a fourth aspect of the present invention, the transfer of the crushed pieces from the preheating tank to the agitation processing tank and the transfer of the crushed pieces from the agitation processing tank to the cooling separation tank in the invention of the third aspect are provided. And a centrifugal force associated with the rotation of each blade in the preheating tank and the stirring tank.

Therefore, according to the fourth aspect of the present invention, when each blade is rotated with the window provided between the tanks being opened, the crushed pieces in each tank are centrifugally generated by the rotation of the blades. Are raised upward while being gathered at the outer peripheral portion of the inside of the tank, and are sequentially transferred to the upper tank through the window.

According to a fifth aspect of the present invention, the cooling separation tank according to the fourth aspect of the present invention is disposed concentrically with the inside of the processing tank main body so that the cooling separation tank has a double tank structure. A screen, a blowing means for blowing air into the cooling separation tank, and a blade rotatably arranged on the inner bottom of the cooling separation tank and stirring the crushed pieces, and the crushed pieces themselves and the release coating film are passed through the screen. It is characterized in that it is separated into

The screen only needs to have a function of allowing a coating film piece peeled off from the crushed piece to pass therethrough. For example, a mesh-like screen such as a wire mesh, a punching metal or the like can be used.

Therefore, in the invention according to the fifth aspect, the crushed pieces transferred to the cooling / separating tank are cooled by blowing air from the blowing means, while the peeling coating film adhered to the crushed pieces is stirred. The crushed pieces themselves are left inside the screen while the peeled coating pieces pass through the mesh of the screen and are collected on the outer periphery of the cooling / separation tank, where they are once separated from the crushed pieces. The situation where the applied coating film piece adheres to the crushed piece again is eliminated.

[0024]

According to the first aspect of the present invention, a preheating tank and a stirring tank are arranged adjacent to each other in two upper and lower stages, and the preheating of the crushed pieces and the coating film peeling treatment are performed in parallel. While the pre-heated crushed pieces are transferred directly to the stirring tank, the time required to raise the temperature required for peeling the coating by stirring is greatly reduced, and the cycle time is shortened. In addition, the processing capacity of the equipment is improved as compared with the conventional method. In addition, since the treatment time can be shortened by improving the above-mentioned coating film peeling efficiency, even the resin layer is not crushed into a powdery form, and there is an effect that the original purpose of the resin collecting efficiency is further improved.

According to the second aspect of the present invention, the treatment in the preheating tank and the stirring tank is performed while stirring by the rotation of the disk-shaped blades. The crushed pieces are uniformly stirred and no processing unevenness occurs. In addition to the same effect as the invention of claim 1, the effect of shortening the processing time and uniforming the processing quality can be obtained. is there.

According to the third aspect of the present invention, the preheating tank and the stirring treatment tank as well as the cooling separation tank are disposed adjacent to each other in the upper and lower three stages to preheat the pulverized pieces, remove the coating film, and Since the crushed pieces after the preheating are directly transferred to the stirring treatment tank while performing the cooling separation in parallel with each other, the crushed pieces after the coating film peeling treatment are directly transferred to the cooling separation tank. In addition to the effects similar to those of the invention described in item 2, there is an effect that the processing capacity of the equipment is significantly improved.

According to the fourth aspect of the present invention, the transfer of the crushed pieces from the preheating tank to the stirring tank and the transfer of the crushed pieces from the stirring tank to the cooling / separation tank are both accompanied by the rotation of the blades. Since it is performed by centrifugal force, there is an advantage that special means for transferring the crushed pieces is not required, in addition to the same effect as the invention according to claim 3.

According to the fifth aspect of the present invention, as the treatment in the cooling separation tank, the crushed pieces themselves and the release coating pieces are separated through the screen while being blown by the blowing means, so that they are once separated. Since the coating film pieces do not adhere to the crushed pieces again, the coating film peeling efficiency is improved, and it is not necessary to perform a separate work of separating the separated coated film pieces and the crushed pieces after the coating film peeling treatment as in the conventional case. This has the effect of reducing the number of steps and cost.

[0029]

FIG. 1 is a structural explanatory view showing a preferred embodiment of a reproduction processing apparatus according to the present invention. As shown in FIG. 1, this regenerating apparatus combines a preheating tank 1 for preheating, a stirring tank 2 for coating film peeling processing, and a cooling separation tank 3 for cooling separation processing with the preheating tank. 1 is the lowermost stage and is arranged adjacently in a three-stage manner, and the crushed pieces P are sequentially transferred upward from below as described later.

For example, a thermoplastic resin waste material having a predetermined coating, such as a polypropylene automobile bumper, has a side of about 5 to 30 mm with a coating film in a crushing step as a previous step. After being crushed into crushed pieces P having a size of, a predetermined amount is charged into the preheating tank 1 by a transfer device 4 such as a pneumatic transport type or a screw type conveyor.

At the inner bottom of the processing tank main body 5 in the preheating tank 1, a disk-shaped blade 6 is arranged, and the blade 6 is driven to rotate by a motor 7. Further, a near-infrared heater 8 as a heating means faces the processing tank body 5. The pre-heating treatment of the crushed pieces P in the pre-heating tank 1 is performed by heating the crushed pieces P to a temperature close to the temperature required for the coating film peeling treatment in the stirring treatment tank 2 in order to easily peel off the coating film on the surface of the crushed pieces P. The crushed pieces P are uniformly heated by the heat from the near-infrared heater 8 in addition to the frictional heat generated by the stirring by the blades 6 in the processing tank body 5. . It goes without saying that, besides the near-infrared heater 8, an electric heater, a warm air heater or the like can be used alone or in combination as the heat source.

A disk-shaped blade 10 as shown in FIG. 2 is disposed at the inner bottom of the processing tank body 9 in the stirring processing tank 2 as in the preheating tank 1, and the blade 10 is a common motor. 7 is driven to rotate. Also,
Since the bottom plate forming the processing tank body 9 of the stirring processing tank 2 also serves as a partition wall for the lower preheating tank,
A window 11 for transferring the crushed pieces is formed in a part of the bottom plate, and a slide shutter 12 driven by a cylinder for opening and closing the window 11 is provided. As described later, in order to allow the transfer of the crushed pieces P through the window 11 from the preheating tank 1 to the stirring tank 2, the blade 10 shown in FIG. A cavity 15 is formed together with the protrusions 14.

Therefore, when the preheating treatment in the preheating tank 1 is completed, the shutter 12 is opened while the blades 6 are rotating to open the window 11, and the stirring in the preheating tank 1 is started. Crushed pieces P after preheating by centrifugal force accompanying
Is gradually passed through the window 11 and the stirring treatment tank 2
Will be transferred to When the inclined plate 16 is provided on the upper wall surface of the stirring tank 2, the crushed pieces P once transferred from the preheating tank 1 to the stirring tank 2 through the window portion 11.
Can be prevented from returning downward again.

When the crushed pieces P are transferred from the preheating tank 1 below the stirring processing tank 2, the shutter 12 is closed, and the crushed pieces P are stirred by the rotation of the blades 10. With this agitation, the crushed pieces P are heated to a temperature immediately before the crushed pieces P are melted due to friction or collision between the crushed pieces P or between the crushed pieces P or the inner wall surface of the processing tank body 9, and a coating film having a reduced adhesive force on the surface is formed. It is separated from the resin itself while being finely crushed. At this time, since the crushed pieces P transferred to the stirring processing tank 2 have already been heated to the predetermined temperature by the previous preheating treatment, the temperature is immediately raised to the predetermined temperature when stirring in the stirring processing tank 2 is started. Then, the coating film adhering to the surface of the crushed pieces P can be efficiently peeled off by a short stirring process.

The temperature in the stirring tank 2 is maintained at a temperature immediately before the resin itself melts (in the case of a thermoplastic resin, generally about 150 to 160 ° C.) as described above. It is desirable to add water as a shower while stirring, if necessary. Further, on the surface of the blade 10, as shown in FIG. 2, predetermined protrusions 14 may be provided as necessary to improve the size of the crushed pieces P or the stirring efficiency.

A cylindrical screen 18 made of a net-like structure, punched metal, or the like is provided in the processing tank main body 17 of the cooling separation tank 3.
It has a substantially double tank structure. At the inner bottom of the processing tank body 17, as shown in FIG. 3, there is provided a disk-shaped blade 19 sized to cover the bottom surface area surrounded by the screen 18. Are formed coaxially and integrally with the blades 6 and 10 on the side of the preheating tank 1 and the stirring processing tank 2, and are driven to rotate by a common motor 7.

The processing tank body 17 in the cooling separation tank 3
The exhaust port 20 is connected to an exhaust device 24 including a dust collector 21, an exhaust fan 22, and an exhaust tube 23. The processing tank body 17 has a material outlet 26 having a cylinder-driven shutter 25. Is provided. Also,
The processing tank main body 17 of the cooling separation tank 3 is provided with a blower 27 for blowing upward cooling air.

Since the bottom plate forming the processing tank main body 17 of the cooling separation tank 3 also serves as a partition wall for the lower stirring processing tank 2, a part of the bottom plate is formed as in the case described above. A window 28 for transferring the crushed pieces is formed with an opening, and a slide shutter 29 driven by a cylinder for opening and closing the window 28 is provided. Then, as will be described later, in order to allow the transfer of the crushed pieces P from the stirring processing tank 2 to the cooling and separating tank 3 through the window 28, FIG.
The blade 19 shown in FIG. 1 also has a gap 32 together with a blade 30 and a projection 31 for scraping the crushed pieces.

Therefore, when the coating film peeling process by stirring in the stirring tank 2 is completed, the shutter 29 is opened while the blade 10 is rotating, and the window 28 is opened. The crushed pieces P after the coating film peeling treatment are gradually transferred to the cooling / separating tank 3 above the crushed pieces P through the window 28 due to the centrifugal force accompanying the stirring in the above. In addition, if the inclined plate 33 is also provided on the upper wall surface of the cooling separation tank 3,
The crushed pieces P once transferred from the stirring processing tank 2 to the cooling / separating tank 3 through the window 28 can be prevented from returning downward again.

When the crushed pieces P are transferred from the stirring processing tank 2 below the cooling separation tank 3 to the cooling separation tank 3, the shutter 29 is closed, and the crushed pieces P are agitated by the rotation of the blades 19 while being blown from the blower 27. The air is blown to accelerate the cooling of the crushed pieces P. Due to the centrifugal force caused by the agitation, the crushed pieces P collide with the screen 18 and are sieved by the screen 18 into the crushed pieces P as a resin material and the release coating pieces adhered by static electricity or the like. After being collected in a space outside of the space 18, the dust is collected by the dust collection device 21. At this time, in order to promote cooling of not only the crushed pieces P but also the blades 19 themselves, it is desirable that the blades 19 be formed of a punching metal or the like as shown in FIG. Then, the crushed pieces P after cooling and sorting are recovered from the material outlet 26 by opening the shutter 25 and reused.

As described above, according to the present embodiment, the processes from the introduction of the crushed pieces P of the resin part with the coating film to the preliminary heating, the coating film peeling process, and the cooling separation can be continuously performed. The processing efficiency will be significantly improved.

Here, as the structure of the blade 10 of the stirring processing tank 2, instead of the structure shown in FIG. 2, a blade formed by a cross-shaped scraping blade 40 inclined as shown in FIG. As shown in FIG. 5, a blade provided with a projection 51 for directing the moving direction of the crushed pieces P upward only on the peripheral portion of the blade main body 50 may be employed.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing a preferred embodiment of a reproduction processing apparatus according to the present invention.

FIG. 2 is a perspective view showing details of a blade of the stirring tank shown in FIG. 1;

FIG. 3 is a perspective view showing details of the blades of the cooling and sorting tank shown in FIG. 1;

FIG. 4 is a perspective view showing a modified example of the blade shown in FIG. 2;

FIG. 5 is a configuration explanatory view showing another modified example of the blade shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Preheating tank 2 ... Stir processing tank 3 ... Cooling / separation tank 5 ... Processing tank main body 6 ... Blade 7 ... Motor 8 ... Near infrared heater (heating means) 9 ... Processing tank main body 10 ... Blade 11 ... Window 12 ... Shutter Reference Signs List 17 treatment tank body 18 screen 19 blades 27 blowing device (blowing means) 28 window portion 29 shutter P crushed pieces of thermoplastic resin parts

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Yukio Okada Inventor F-term (reference) 4D075 BB01X BB01Y BB01Z BB20X BB20Y BB20Z 4F301 A21 AA12 AA21 AC04 AC08 BA15 BA21 BA15 BC15 BC22 BC25 BC38 BC62 BE09 BE11 BE30 BE31 BF05 BF29 BF31 CA09 CA10 CA32 CA45 CA62 4G037 AA05 AA11 CA11 DA20 DA21

Claims (5)

[Claims] 1. Reproduction of a resin part with a coating film in which a thermoplastic resin part having a coating film attached thereto is previously crushed to a predetermined size, and the crushed pieces are stirred in a treatment tank to peel off the coating film. A processing device, a preheating tank for preheating the crushed pieces by a heating means, and a stirring treatment tank for stirring the preheated crushed pieces to peel off the coating film, which are arranged adjacently in upper and lower two stages, An apparatus for regenerating a resin part with a coating film, wherein a ground piece after preheating is directly transferred from the preheating tank to the stirring tank. 2. The preheating tank and the stirring processing tank each include a disk-shaped stirring blade that covers an inner bottom surface of the cylindrical processing tank main body. 2. The coating according to claim 1, wherein the crushed pieces are preheated while being agitated by the rotation, and the coating treatment is performed while the crushed pieces are agitated and heated by the rotation of the blades in the stirring treatment tank. Reprocessing equipment for resin parts with membrane. 3. A preparatory heating tank and an agitation treatment tank, and a cooling separation tank are added to each other in three stages, and the cooling separation tank cools the crushed pieces after the coating film peeling treatment. While having the function of separating the crushed pieces and the release coating while the coating is being performed, it is possible to directly transfer the crushed pieces after the coating release processing from the stirring processing tank to the cooling separation tank. The recycling apparatus for a resin part with a coating film according to claim 2. 4. The transfer of the crushed pieces from the preheating tank to the stirring tank and the transfer of the crushed pieces from the stirring tank to the cooling / separation tank are performed by rotating the respective blades in the preheating tank and the stirring tank. The apparatus for regenerating a resin part with a coating film according to claim 3, wherein the apparatus is configured to be performed by a centrifugal force accompanying the above. 5. The cooling separation tank, a screen disposed concentrically in the processing tank body so as to form the cooling separation tank into a double tank structure, and a blowing means for blowing air into the cooling separation tank. A blade which is rotatably arranged at an inner bottom portion of the cooling separation tank and stirs the crushed pieces, and separates the crushed pieces themselves and the release coating through the screen. 5. The reprocessing apparatus for a resin part with a coating film according to 4.