JP2001030250A - Regeneration treatment apparatus for resin part having coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a treatment time by quickening the temp. rise of crushed pieces of a thermoplastic resin part brought about by stirring in a treatment tank. SOLUTION: Crushed pieces P charged in a treatment tank 2 are stirred to be raised in temp. by the mutual friction and collision thereof to peel the coating films on the surfaces of the crushed pieces P while crushing them. A preheating tank 3 for storing crushed pieces P to preheat them is provided separately from the treatment tank 2. By this constitution, the fine powder component W such as a coating film powder or a resin powder generated by the peeling treatment in the treatment tank 2 is taken out and only the hot air after the separation treatment by a separator 9 is blown in the preheating tank 3 to preheat the crushed pieces P before charging them in the treatment tank 2.

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 reusing a resin part waste material which has been subjected to an additional coating such as an automobile bumper. The present invention relates to an apparatus for removing a coating film on the surface.

[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 (for example, Japanese Patent Laid-Open No.
-58383).

[0003]

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.

In the method in which the coating film is peeled off only by stirring the crushed pieces, the temperature must be raised to a temperature close to the temperature immediately before the resin itself softens or melts due to friction or collision heat between the crushed pieces accompanying the stirring. Because it does not become
In addition to the disadvantage that the treatment time is unnecessarily long, not only the coating film on the surface of the crushed pieces but also the resin layer itself is crushed into powder due to the lengthening of the stirring time, and the original purpose of resin recovery Efficiency will be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned 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.

[0006]

According to the first aspect of the present invention, there is provided a treatment tank for agitating a crushed piece of a thermoplastic resin part to which a coating film has adhered and peeling the coating film by mutual frictional collision between the crushed pieces. A preheating tank for containing crushed pieces to be put into the processing tank, and preheating the crushed pieces to a predetermined temperature prior to coating film peeling treatment in the processing tank,
The fine powder component in the processing tank has the thermal energy of the resin or the fine powder component of the coating film generated along with the coating film peeling treatment in the processing tank so as to effectively use the heat energy as a heat source in the preheating tank. A heat energy supply means for positively supplying heat energy to the preheating tank side.

As a method of positively supplying the thermal energy of the fine powder component to the preheating tank side, for example, the fine powder component is sucked from the inside of the processing tank as described in the second aspect of the invention. The fine powder component is separated, and only the warm air left by the separation process is directly supplied into the preheating tank, or a heating chamber is separately formed in advance with the preheating tank, and the heating chamber is formed separately. The preliminary heating tank is heated by blowing only the hot air after the above-mentioned separation treatment.

Therefore, according to the first aspect of the present invention, the temperature required for peeling the coating film from the surface of the crushed piece is about 120 to 150 ° C., which is the temperature immediately before the thermoplastic resin itself melts. The crushed pieces of the thermoplastic resin in the treatment tank are heated to a temperature close to the temperature due to mutual frictional collision due to stirring, etc., and by repeating the stirring for a predetermined time, the coating film becomes powdery together with a part of the resin layer. The peeling is promoted. In this case, the coating film powder and the resin powder immediately after the peeling treatment have a thermal energy of about 100 to 120 ° C., and the thermal energy of the fine powder component such as the coating film powder is used to make effective use of the thermal energy. It is positively supplied to the preheating tank side by the energy supply means.

Thus, if the crushed pieces of the thermoplastic resin component in the preheating tank are heated in advance before being put into the processing tank, the crushed pieces already have heat energy when they are put into the processing tank. Therefore, the temperature rises rapidly at the same time as the stirring starts. When the coating film peeling process is performed continuously, if the stirring in the processing tank and the preheating in the preheating tank are performed in parallel, one cycle or one shot for peeling the coating film is performed. The processing time for each is greatly reduced.

[0010] The invention described in claim 2 is the same as the claim 1.
The heat energy supply means according to the invention described in (1), the fine powder separation means provided in the middle of the supply passage connecting the processing tank and the preheating tank, the positive powder component in the processing tank positively toward the fine powder separation means side A suction means for sucking the fine powder in the processing tank into the component fine powder separating means and performing only the separation process. It is characterized in that it is sent directly into the heating tank.

Therefore, in the invention according to the second aspect, as described above, it is extremely effective in terms of energy efficiency to effectively use the heat energy of the fine powder components such as the coating film powder and the resin powder. However, if the fine powder component was directly introduced into the preheating tank as it was, the fine powder component would adhere to the crushed pieces before the coating peeling treatment, so that the coating peeling efficiency would be reduced, The fine powder component generated during the coating film peeling treatment in the treatment tank is sucked into the fine powder separation means, and only the hot air after the separation treatment is sent to the preheating tank side. By doing so, only the thermal energy of the fine powder component such as the coating film powder is effectively used as a heat source in the preheating tank.

Further, according to a third aspect of the present invention, in the first aspect of the present invention, the thermal energy supply means includes a chamber integrally formed on an inner circumference or an outer circumference of the processing tank; A suction means for positively sucking the fine powder component into the chamber is provided, and the preheating tank is heated by thermal energy of the fine powder component sucked into the chamber.

Therefore, in the invention according to the third aspect, the fine powder component such as the coating film powder generated during the coating film peeling treatment in the processing tank is directly supplied to the chamber integrated with the preheating tank. However, since the chamber itself is isolated from the preheating tank itself, the fine powder component does not adhere to the crushed pieces in the preheating tank, and the thermal energy of the fine powder component supplied into the chamber does not change. Is indirectly transmitted to the crushed pieces through the preheating tank itself to preheat the crushed pieces.

[0014]

According to the first aspect of the present invention, the heat energy of the fine powder component such as the coating film powder generated during the coating film peeling treatment in the processing tank should be supplied to the processing tank. In order to effectively use the heat energy of the fine powder component in the processing tank to the preheating tank side in order to effectively use as a heat source in the preheating tank in which the crushed pieces are stored in advance, stirring is performed by stirring. The time required to raise the temperature to the temperature required for peeling the coating film is greatly reduced, which can shorten the cycle time and contribute to energy saving. Since it is performed by frictional collision, etc., shortening of the stirring time (coating film peeling time) can prevent the resin layer itself from being unnecessarily crushed into a powdery form, and can collect the resin. This has the effect of further improving efficiency. .

According to the second aspect of the present invention, the fine powder component in the processing tank is positively sucked into the fine powder separating means side by the suction means, and the fine powder component is separated. Since only the warm air is supplied to the preheating tank side, in addition to the same effect as the invention according to claim 1,
Not only does the fine powder component not adhere to the crushed resin pieces in the preheating tank, but also the fine powder component generated due to the coating film peeling treatment in the processing tank is positively and promptly absorbed by the suction means. By the suction, the fine powder component once separated from the crushed pieces does not adhere to the crushed pieces again, and the coating film peeling efficiency is further improved.

Further, according to the third aspect of the present invention,
The fine powder component generated in the processing tank was directly sucked into the chamber on the side of the preheating tank, and the heat energy of the fine powder component was used to heat the internal crushed pieces through the preheating tank. In addition to obtaining the same effects as the inventions described in the items 1 and 2, the preheating tank and the accompanying chamber are independent of each other, so that only the heat energy of the fine powder component is effectively used, and There is an advantage that there is no possibility that the fine powder component in the chamber adheres to the crushed pieces in the preheating tank.

[0017]

1 to 4 show a first preferred embodiment of a processing apparatus according to the present invention. As shown in FIG. 1, a substantially cylindrical hermetic seal is provided on a gantry 1 as shown in FIG. A treatment tank 2 of the type is installed, and a preheating tank 3 of the same closed hopper type is installed on the front side of the processing tank 2, and a vibrating sieve 4 is installed on the rear side of the processing tank 2. Have been. Further, between the processing tank 2 and the preheating tank 3,
A conveyor 5 or 6 is disposed between the processing tank 2 and the vibrating sieve 4.

The treatment tank 2 is used for removing a coating film adhered to the crushed piece P by inputting a crushed piece P of a thermoplastic resin part having a predetermined coating film. The crushed pieces P to be put into the treatment tank 2 are stored in advance in the treatment tank 3, and preheating is performed in the preheating tank 3 prior to the coating film peeling treatment.

For example, a thermoplastic resin component waste material which has been subjected to a predetermined decorative coating, such as a polypropylene automobile bumper, has a side with a coating film of 5 mm in a previous crushing step. Pulverized pieces P about 30mm in size
And then sent to the preheating tank 3 to be temporarily stored. When there is a request to input the crushed pieces P from the processing tank 2 side, a take-out port (not shown) of the preheating tank 3 is opened, and the crushed pieces P in the preheating tank 3 are measured for one shot. The weighed pieces P are put into the processing tank 2 via the conveyor 5.

As shown in FIG. 2, a rotating disk 7 is provided at the inner bottom of the processing tank 2 so as to cover the entire bottom surface thereof. A plurality of blades 7a are attached to the upper surface of the rotating disk 7, and the rotating disk 7 is driven to rotate by a motor (not shown). When a predetermined amount of the crushed pieces P is put into the processing tank 2, the rotating disk 7 is driven to rotate, and the crushed pieces P are stirred. With this stirring, the crushed pieces P,
Due to mutual frictional collision between Ps or frictional collision with the inner wall surface of the tank, each crushed piece P is heated to a temperature immediately before melting,
The coating film having a reduced coating film adhesive force on its surface becomes fine powder component W while being finely crushed together with a part of the resin layer, and is separated from the resin layer itself.

The processing tank 2 and the preheating tank 3 are connected to each other with a fine powder supply passage 8, and a fine powder separator (fine powder separation means) 9 is provided in the middle of the fine powder supply passage 8. And a dust collector 11 is connected to the preheating tank 3 via a suction blower 10. A heat energy supply means 12 is formed by the suction blower 10 and the fine powder supply passage 8 and the like.
Since the suction force of 0 extends not only into the preheating tank 3 but also into the fine powder supply passage 8 and the inside of the processing tank 2, the fine powder component W generated by the coating film peeling processing in the processing tank 2 is thereby formed. Is positively and promptly sucked into the fine powder separator 9 side.

As the fine powder separator, for example, as shown in FIG. 3, a cyclone type of a lower suction type and an upper blowing type is adopted, and the fine powder component W is reduced along a spiral wall surface 9a. By spirally flowing upward from above, only the solid component having a relatively large specific gravity, that is, the fine powder component W is separated and left in the box portion 9b of the separator 9, and the fine powder component W Only the heat energy that has been provided is supplied as warm air or hot air to the subsequent preheating tank 3 side.

Here, the thermal energy supply means 12
Fine powder component W such as coating powder or resin powder generated in processing tank 2
Is quickly supplied from the processing tank 2, while only the thermal energy of the fine powder component W is supplied into the preheating tank 3. Of the processing tank 2 is substantially at the center in the height direction.

Therefore, according to the present embodiment, as described above, when the crushed pieces P are put into the processing tank 2, the rotating disk 7 is driven and the crushed pieces P are stirred. Due to the agitation, the crushed pieces P are heated to a temperature immediately before the crushed pieces P are melted due to mutual frictional collision between the crushed pieces P, or between the crushed pieces P and the inner wall surface of the tank, and the adhesive force on the surface of the crushed pieces P decreases. The resulting coating film is peeled from the resin layer itself while being finely crushed, and a part of the surface of the resin layer itself is also crushed into a powder to become the fine powder component W.

At the same time, since the suction blower 10 is operated in parallel with the coating film peeling process in the processing tank 2, the suction force of the suction blower 10 causes not only the preheating tank 3 but also the fine powder supply passage 8 to flow. The fine powder component W such as the coating powder or the resin powder generated by the coating stripping process in the processing tank 2 is immediately sucked into the fine powder separator 9 through the coating tank 9 through the processing tank 2. After the powder component W is separated and removed, only the thermal energy of the fine powder component W is supplied into the preheating tank 3 as hot air or hot air. Therefore, in parallel with the coating film peeling treatment in the processing tank 2, the crushed pieces P stored in the preheating tank 3 are preheated by warm air or hot air blown into the preheating tank 3. Become.

Here, the temperature in the processing 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. Preferably, water is added dropwise in a shower as needed during stirring.

When the coating film peeling processing in the processing tank 2 is completed in this way, an unillustrated outlet provided in the processing tank 2 is opened, and the crushed pieces P after the coating film peeling processing are passed through the conveyor 6. While being taken out on the vibrating sieve 4, a predetermined amount of the crushed pieces P preliminarily preheated in the preheating tank 3 is put into the processing tank 2, and the process proceeds to the next cycle of the coating film peeling processing. The crushed pieces P after the coating film peeling treatment are recovered after fine powder components W such as coating film powder and resin powder still adhered to the surface are separated and removed by the vibrating sieve 4 and then recovered as desired. Reused as resin material.

On the other hand, as described above, the crushed pieces P
Has already been heated to a predetermined temperature by the preheating treatment in the preheating tank 3, the temperature is immediately increased to the temperature required for the coating film peeling treatment when the stirring in the processing tank 2 is started, The coating film adhering to the surface of the crushed pieces P can be efficiently peeled off by stirring for a short time,
This is also preferable in terms of energy efficiency.

According to the results of experiments conducted by the present inventors, the weight of the crushed pieces P for one shot put into the processing tank 2 is set to 80 to
When the temperature of the crushed pieces P is increased by t by preheating as shown in FIG.
In addition to the fact that it can be shortened by about two thirds of the case without preheating, the degree of agitation of the crushed pieces P is inevitably smaller than that without preheating. It has been found that the loss due to powdering can be reduced, and the resin recovery efficiency can be improved by about 20% as compared with the case without preheating. Further, as the preheating effect, for example, since the crushed pieces P of 80 kg / batch can be heated from a room temperature of 20 ° C. to about 50 ° C., the specific heat of polypropylene, which is a main material of the crushed pieces P, is reduced by 0.4%.
When it is set to 6 cal / g · ° C., the amount of heat corresponding to approximately 740 kcal can be saved as energy for preheating.

FIG. 5 is a diagram showing a second preferred embodiment of the processing apparatus according to the present invention. In the drawing, portions common to those of the first embodiment shown in FIG. is there.

In the second embodiment, the preheating tank 1
A heating chamber 14 is formed integrally with the outer periphery of the processing tank 3 and the processing chamber 2 is directly connected to the processing chamber 2 through the fine powder supply passage 8.
The fine powder separator 9 is installed upstream of the suction blower 10. And the chamber 14
As a partition separating the preheating tank 13 and the preheating tank 13, for example, a partition made of a copper alloy having excellent thermal conductivity is used.

Therefore, in the second embodiment,
A fine powder component W such as a coating powder or a resin powder generated by the coating film peeling treatment in the processing tank 2 is directly introduced into the chamber 14, and the heat energy of the fine powder component W is transferred to the preheating tank. By being transmitted to the internal crushed pieces P via the 13 itself, the crushed pieces P are preheated. In the second embodiment, basically the same effects as in the first embodiment can be obtained.

Here, in order to apply the chamber 14 shown in FIG. 5 to the preheating tank 3 shown in FIG. 1, the chamber 14 is attached to the preheating tank 3 of the first embodiment shown in FIG. Then, only warm air or hot air after passing through the fine powder separator 9 may be introduced into the chamber 14.

[Brief description of the drawings]

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

FIG. 2 is an enlarged perspective view of a rotating disk arranged in the processing tank of FIG. 1;

FIG. 3 is a configuration explanatory view showing details of the fine powder separator of FIG. 1;

FIG. 4 is a characteristic diagram showing a relationship between a heating effect by preheating and a time required for a coating film peeling process.

FIG. 5 is a configuration explanatory view showing a second preferred embodiment of the processing apparatus according to the present invention.

[Explanation of symbols]

 2 ... Treatment tank 3 ... Preheating tank 7 ... Rotating disk 8 ... Fine powder supply passage 9 ... Fine powder separator (fine powder separation means) 10 ... Suction blower (suction means) 12 ... Heat energy supply means 13 ... Preheating Vessel 14… Chamber P… Pulverized pieces W… Fine powder component

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomomi Takase Hirose Prefecture Kamo-gun Kawachi-machi Ogata Kawato 743 Takasego Seikagaku Co., Ltd. (72) Inventor Taiichi Hijikata 3-1-1 Honohara, Toyokawa City, Aichi Prefecture Shinto Industrial Co., Ltd. (72) Inventor Toshihisa Komori 3-1-1 Honohara, Toyokawa City, Aichi Prefecture Shinto Kogyo Co., Ltd. (72) Inventor Yukio Okada 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Nissan Motor Co., Ltd. (72) Inventor Atsushi Mizutani 2 in Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Nissan Motor Co., Ltd. 2 Takaracho, Kanagawa-ku Nissan Motor Co., Ltd. F term (reference) 4D053 AA03 AB01 BA01 BB02 BC01 BD04 CA01 CB13 4D075 BB12X BB16X BB20X BB23Y CA47 DA23 DB34 DC13 4F301 AA14 AC11 BA02 BA12 BA17 BA21 BE01 BE31 BF05 BF09 BF12 BF29 BF32

Claims (3)

[Claims] 1. A processing tank for agitating crushed pieces of a thermoplastic resin part to which a coating film has adhered and peeling off the coating film by mutual frictional collision between the crushed pieces, and a crushed piece to be put into the processing tank. And a preheating tank for preheating to increase the temperature of the crushed pieces to a predetermined temperature prior to the coating film peeling treatment in the processing tank, and a resin or a resin generated during the coating film peeling processing in the processing tank. In order to effectively use the thermal energy of the fine powder component of the coating film as a heat source in the preheating tank, a thermal energy supply for actively supplying the thermal energy of the fine powder component in the processing tank to the preheating tank side Means for regenerating a resin part with a coating film. 2. The thermal energy supply means includes a fine powder separating means provided in a supply passage connecting the processing tank and the preheating tank, and a fine powder component in the processing tank is positively directed to the fine powder separating means. And a suction means for selectively sucking the fine powder component in the processing tank into the fine powder separating means and performing only the separation process, and sending only warm air to the preheating tank side. The apparatus for reprocessing a resin part with a coating film according to claim 1. 3. The thermal energy supply means includes a chamber integrally formed on the inner or outer periphery of the processing tank and a suction means for positively sucking fine powder components in the processing tank into the chamber. 2. The apparatus according to claim 1, wherein the preheating tank is heated by heat energy of the fine powder component sucked into the chamber.