JP3983045B2 - Recycled resin raw material recovery method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for recovering recycled resin raw materials from painted resin-based recycled products.
[0002]
[Prior art]
In the case of recycling a resin-based resin product to which a metal or the like is fixed and painted, conventionally, after pulverized the coarsely pulverized resin product, the pulverized product is separated and then extruded through a filter to a predetermined length. And then recovered as pelletized recycled resin raw material.
[0003]
There has also been proposed a method in which a coated resin product is finely pulverized and the fine powder is separated into a resin base material and a coating powder by a specific gravity method (Japanese Patent Laid-Open No. 8-309750).
The specific gravity method is not described in the publication, but in order to separate the resin base material and the coating film powder by the specific gravity method, the degree of fine pulverization is 400 μm or less. Yes.
[0004]
[Problems to be solved by the invention]
In the former having the extrusion process, the crosslink between molecules is broken when the resin is heated, so the MFR (Melt Flow Rate) indicating the viscosity of the regenerated pellet is about 15.5 g. / 10 minutes fast and low viscosity, making it difficult to regenerate thin plate-like products, resulting in low commercial value.
[0005]
And since it has a melt extrusion process and there are many processes, it is about twice as expensive as a virgin material.
[0006]
Therefore, in the case of the example described in the above publication, there is no dissolution extrusion step, but it must be finely pulverized to 400 μm or less, requires a pulverization time, and there is a risk of explosion if pulverized to 400 μm or less.
Also, there is no application for the regeneration of resin products with metal attached.
[0007]
The present invention has been made in view of the above points, and the object of the present invention is to recover a resin material that can efficiently regenerate the resin material at a low cost with a small number of work steps and has no danger of explosion in the work process. The point is to provide a method.
[0008]
[Means for solving the problems and effects]
In order to achieve the above object, the invention according to claim 1 includes a pulverization step of pulverizing a coated resin-based recycled product, and a pulverized product having a size of 1 to 2 mm by filtering the pulverized product. A filtration step to obtain, a magnetic force separation step of separating magnetic metal from the finely pulverized product by magnetic force, and a specific gravity separation step of separating the resin matrix as a recycled resin material from the finely pulverized product from which the magnetic metal has been removed A recycled resin raw material recovery method comprising:
[0009]
There is no need for a melt-extrusion process, and the recycled resin raw material has high viscosity and high commercial value.
Further, a finely pulverized product having a size of 1 to 2 mm can be obtained in the filtration step, and the peelability of the coated body can be kept high at 2 mm or less, and the risk of explosion can be substantially eliminated at 1 mm or more.
[0010]
According to a second aspect of the present invention, in the method for recovering a recycled resin raw material according to the first aspect, the pulverization step includes a rough pulverization step of roughly pulverizing a coated resin-based recycled product, and a roughly pulverized pulverized product. And a pulverizing step of pulverizing to a size of 1 to 2 mm .
[0011]
The pulverization process can be performed in two steps, a rough pulverization process and a fine pulverization process, so that the working time and labor can be reduced and the cost can be reduced.
[0012]
According to a third aspect of the invention, performed in the recovery method for regenerating resin material according to claim 2, the rough grinding step by rough ground again charged with pulverized product in the same grinder the milling step 1-2 It is characterized by pulverizing to a size of mm .
[0013]
Rough pulverization and fine pulverization can be performed by the same pulverizer, and the equipment cost and installation space can be kept small.
[0014]
According to a fourth aspect of the present invention, there is provided the method for recovering a recycled resin raw material according to the first or second aspect, wherein the specific gravity separation step separates the nonmagnetic metal, the resin matrix, and the coated body based on the specific gravity difference. It is characterized by extracting a mother body.
[0015]
Based on the specific gravity difference, it is possible to classify into a non-magnetic metal, a resin matrix, and a painted body, whereby the resin matrix can be easily extracted.
[0016]
According to a fifth aspect of the present invention, in the method for recovering a recycled resin raw material according to the fourth aspect of the invention, the specific gravity separation step separates into a non-magnetic metal, a resin matrix, and a coated body in water by an oscillating water flow. .
[0017]
It can be easily separated into a non-magnetic metal, a resin matrix, and a coated body due to the difference in specific gravity in water by the oscillating water flow.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
The schematic block diagram of the collection | recovery apparatus 1 in the collection method of the recycled resin raw material which concerns on this Embodiment is shown in FIG.
[0019]
The recycled resin raw material is a bumper of an automobile, and the bumper is mainly made of resin and is coated, and metals are fixed.
The recovery device 1 is first provided with a pulverizer 2, and pulverized by pulverizing teeth 4 which are loaded with the bumper from the inlet 3 and rotated.
[0020]
A mesh 10 as a filtration device is detachably stretched at the discharge port 5 below the grinding teeth 4.
An inclined receiving tray 12 is disposed below the discharge port 5, and a 1 mm mesh 11, which is also a filtration device, is stretched on a part of the bottom plate of the receiving tray 12.
[0021]
A take-out opening 13 is provided at the downstream portion of the receiving tray 12 so as to be freely opened and closed by a cover plate 14 also serving as a bottom plate.
A chute 30 inclined from the extraction opening 13 extends downstream.
[0022]
As shown in FIG. 2, the chute 20 is branched into three branch chutes 31, 32, 33 on the downstream side, and the positions of the downstream end ports 31a, 32a, 33a are different from each other, and below the downstream end ports 31a, 32a, 33a. The collection trays 35, 36, and 37 are disposed in the front.
[0023]
As shown in FIG. 2, the chute 30 is inclined by a slight angle θ with respect to the horizontal plane h in a direction perpendicular to the flow direction.
Of the three branch chutes 31, 32, 33, the branch chute 31 is at a high position and communicates with the upstream side in a substantially straight line, and the branch chutes 32, 33 branch in order to the lower one.
[0024]
The chute 30 has a mechanism that vibrates in a lateral direction perpendicular to the flow direction, and a water supply port 34 is disposed on the upstream side.
The structure of the chute and the water supply port 34 constitute a specific gravity separation mechanism.
[0025]
A belt conveyor 20 is disposed above the upstream side of the chute 30, and a magnet 22 is provided along the upper surface of the belt that moves below the endless belt 21 of the belt conveyor 20 to form a magnetic force separation mechanism. Has been.
A conveyor 23 is provided with one end below the downstream end of the belt conveyor 20.
[0026]
The recovery procedure in the recovery apparatus 1 as described above will be described below with reference to the flowchart of FIG.
First, a 10 mm mesh is attached to the mesh 10 arranged at the discharge port 5 of the pulverizer 2 (step 1).
[0027]
Then, a reclaimed bumper is introduced into the inlet 3 (step 2), and the pulverizer 2 is operated to rotate the pulverization teeth 4 to perform rough pulverization (step 3).
The bumper is roughly crushed to about 10 mm, and the coarsely pulverized material having a maximum length of 10 mm or less is filtered by a 10 mm mesh and falls to the receiving tray 12.
[0028]
The coarsely pulverized material falling on the receiving tray 12 is taken out from the take-out opening 13 in which the cover plate 14 is opened without being filtered by the 1 mm mesh 11 which is a part of the bottom plate (step 4).
Next, the 10 mm mesh arranged at the discharge port 5 of the pulverizer 2 is replaced with a 2 mm mesh (step 5).
[0029]
Then, the worker puts the coarsely pulverized material taken out in the step 4 into the input port 3 of the same pulverizer 2 (step 6), and performs fine pulverization (step 7).
The coarsely pulverized product is finely pulverized to 2 mm or less, and the coarsely pulverized product having a maximum length of 2 mm or less is filtered through a 2 mm mesh and falls to the receiving tray 12.
[0030]
A 1 mm or less pulverized product passes through a 1 mm mesh 11 of the receiving tray 12, and a 1 to 2 mm pulverized product passes through an extraction opening 13 closed by a cover plate 14 and reaches a chute 30.
In order to obtain a finely pulverized product of 1 to 2 mm from the bumper as described above, the pulverization process consists of two processes, a rough pulverization process and a fine pulverization process, which efficiently reduce work time and labor and reduce costs. Can be achieved.
[0031]
Since rough pulverization and fine pulverization are performed by the same pulverizer 2, equipment cost and installation space can be reduced.
By using a finely pulverized product of 2 mm or less, the peelability of the coated body coated on the resin is high, and most of it is peeled off.
There is no risk of explosion as a finely pulverized product of 1 mm or more.
[0032]
The 1 to 2 mm finely pulverized product reaching the chute 30 is caused to flow on the chute 30 by the water supplied from the water supply port 34 (step 8).
The magnetic metal such as iron contained in the finely pulverized material is attracted by the magnet 22 disposed above the finely pulverized material flowing upstream of the chute 30 and is adsorbed via the belt 21. The belt 21 is moved with the rotation of the belt 21 in the attracted state, falls on the conveyor belt 23 at the end of the belt conveyor 20 without the magnet 22, and is carried out by the conveyor belt 23.
[0033]
Thus, the magnetic metal is magnetically fractionated from the finely pulverized product (step 9), and the magnetic metal is removed from the finely pulverized product that is caused to flow on the chute 30 by water.
The finely pulverized product from which the magnetic metal has been removed includes the resin matrix, the peeled coated body, and the nonmagnetic metal.
[0034]
Non-magnetic metals such as aluminum are different in specific gravity between the resin matrix and the painted body, and the resin matrix and the painted body have substantially the same specific gravity. However, the surface area is different and the buoyancy is different, and the painted body is more likely to float in water.
[0035]
The chute 30 is subjected to lateral vibration (step 10), so that the finely pulverized material is poured into the water that is vibrated by the chute 30 and fractionated by specific gravity (step 11).
[0036]
That is, in the process in which the finely pulverized material is swept away by the water at the chute 30 inclined at an angle θ with respect to the horizontal plane h in a direction perpendicular to the flow direction, the heaviest nonmagnetic metal sinks and falls to the lower side due to resistance with the bottom surface. It flows in a high position without flowing into the branch chute 31.
[0037]
The coated body having a small specific gravity and a large surface area flows downward so as to float on the surface of the water, and flows into the lowest branch chute 33.
A resin matrix having a small specific gravity but a surface area smaller than that of the coated body is in water and touches the bottom surface, receives some resistance, flows through a middle height, and flows into the intermediate branch chute 32.
[0038]
In this way, the specific gravity is divided into three types of non-magnetic metal, resin matrix, and painted body, each branching into branch chutes 31, 32, 33, and collecting trays 35, 36, Collected separately in 37.
In this way, the resin matrix can be collected in the collection tray 36 (step 12).
[0039]
The recovered resin matrix can be used as a recycled resin raw material as it is.
As described above, the recovery apparatus 1 can efficiently separate and recover the resin matrix as a recycled resin raw material from the bumper with a small number of work steps, thereby reducing the cost.
[0040]
Since the resin matrix as a recycled resin raw material is recovered without requiring a melt extrusion process, a thin plate-like product can be recycled because the viscosity of the recycled resin raw material is high, and the commercial value can be maintained high.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a recovery device in a recycled resin raw material recovery method according to an embodiment of the present invention.
FIG. 2 is a perspective view of a downstream portion of the chute.
FIG. 3 is a flowchart showing a recovery procedure by the recovery apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Recovery apparatus, 2 ... Crusher, 3 ... Input port, 4 ... Crushing tooth, 5 ... Discharge port,
10 ... Mesh, 11 ... Mesh, 12 ... Receiving tray, 13 ... Extraction opening, 14 ... Cover plate,
20 ... belt conveyor, 21 ... belt, 22 ... magnet, 23 ... transport conveyor,
30 ... Chute, 31, 32, 33 ... Branch chute, 34 ... Water supply port, 35, 36, 37 ... Collection tray.

Claims (5)

A pulverization process for pulverizing the recycled resin-based recycled product;
A filtration step of filtering the pulverized product to obtain a finely pulverized product having a size of 1 to 2 mm ;
A magnetic force separation step of separating magnetic metal from the finely pulverized product by magnetic force;
A method for recovering a recycled resin raw material, comprising: a specific gravity separation step of separating a resin matrix as a recycled resin raw material based on a specific gravity difference from the finely pulverized product from which the magnetic metal has been removed. The grinding step
A rough crushing process for rough crushing of recycled resin-based reclaimed products;
2. The method for recovering a recycled resin raw material according to claim 1, further comprising a fine pulverization step of finely pulverizing the coarsely pulverized product into a size of 1 to 2 mm . 3. The recycled resin raw material according to claim 2, wherein the pulverized material roughly pulverized in the rough pulverization step is again put into the same pulverizer, and the fine pulverization step is performed to finely pulverize to a size of 1 to 2 mm. Recovery method.   The method for recovering a recycled resin material according to claim 1 or 2, wherein the specific gravity separation step extracts the resin matrix by separating into a nonmagnetic metal, a resin matrix, and a coated body based on a specific gravity difference.   The method for recovering a recycled resin raw material according to claim 4, wherein the specific gravity separation step separates the non-magnetic metal, the resin matrix, and the coated body in water by an oscillating water flow.

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