JP7190228B1 - Composite material sorted collection system and sorted collection method - Google Patents

Abstract

Kind Code: A1 A separation and collection technique excellent in recyclability for a composite material in which a sheet of synthetic resin is laminated on a predetermined metal body is provided. A composite material sorting and collecting system 1 of the present disclosure is a system for sorting and recovering a synthetic resin and a metal foil from a composite material 2 in which the synthetic resin and the metal foil are laminated in a sheet form. . This composite material sorting and collecting system 1 includes a stripping tank 10 containing a stripping solution 100, a cleaning tank 20 for cleaning the mixture containing the stripped synthetic resin and metal foil, and water removed from the cleaned mixture. A water removal device 30 for removing water and a separation device 50 for separating the mixture into synthetic resin and metal foil by applying a predetermined external force to the mixture. Then, the separating device 50 applies an external force to a piece of synthetic resin and/or metal foil contained in the mixture and having a size equal to or larger than a predetermined area, thereby separating the synthetic resin and the metal foil. You can separate. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a separate collection system and a separate collection method for composite materials in which a sheet of synthetic resin is laminated on a predetermined metal body.

2. Description of the Related Art In recent years, multi-layer packaging films composed of synthetic resin layers and metal foil layers have been mass-produced and used for packaging capsules, tablets, foodstuffs, and the like. Also, in aluminum ingots and the like, a synthetic resin sheet is sometimes used to protect the metal surface. Regarding the multilayer film for packaging, for example, when packaging capsules and tablets, PTP sheets containing aluminum foil are used, but such packaging containers are almost entirely discarded after use ( landfill or incineration).

The reason why the multi-layer film for packaging made up of a synthetic resin layer and a metal foil layer has poor recyclability is that it is difficult to separate and collect the metal foil and the synthetic resin from the multi-layer film for packaging after use. Therefore, techniques have been proposed to enable recycling of such multi-layer films for packaging.

For example, Patent Literature 1 discloses a method for recycling a multilayer film including a plastic layer and an aluminum layer, the main components of which are polyester (PET), polypropylene (PP) and polyethylene (PE). In this technique, the aluminum of the multilayer film waste is selectively dissolved to induce layer separation, and the specific gravity difference is used to separate the PP and PE mixture layer and the PET layer.

Japanese Patent No. 4574543

In order to recycle composite materials in which synthetic resin and metal foil are laminated in sheet form without disposal (landfilling or incineration), the above-mentioned materials collected after use or collected as defective products in the manufacturing process are required. It is necessary to separate the composite material into synthetic resin and metal foil and recycle each material. However, in the composite materials mentioned above, which are used to protect capsules, tablets, and foodstuffs from moisture absorption and deterioration, and to keep them clean and to enable packaging, synthetic resins and metal foils are joined without gaps by adhesives. Therefore, it is difficult to separate each material. Composite materials in which a sheet of synthetic resin is laminated on a metal body may be difficult to separate and collect, for example, a synthetic resin sheet attached to the surface of an aluminum ingot.

Here, according to the technique described in Patent Document 1, a multilayer waste film containing a pulverized aluminum layer is put into a reactor and treated with a liquid that dissolves aluminum, thereby selectively removing the aluminum layer. By dissolving, the plastic layer and the aluminum layer can be separated. However, in order to dissolve the aluminum layer in this way, it is necessary to pulverize the multilayer waste film into relatively small pieces. Poor handleability may adversely affect the recyclability of the multilayer waste film. As described above, there is still room for improvement in the technique of sorting and recovering a composite material in which a sheet of synthetic resin is laminated on a predetermined metal body with excellent recyclability.

An object of the present disclosure is to provide a sorting and collecting technique excellent in recyclability for a composite material in which a sheet of synthetic resin is laminated on a predetermined metal body.

A composite material separation and collection system of the present disclosure is a composite material separation and collection system that separates and collects a synthetic resin and a metal body from a composite material in which a synthetic resin is laminated on a predetermined metal body in a sheet form. is. This composite material sorting and recovery system includes a stripping tank containing a stripping solution for immersing the composite material to strip the synthetic resin from the metal body, and a plurality of the composite materials stored in the stripping tank. a cleaning tank containing a cleaning liquid for cleaning the mixture containing the stripped synthetic resin and the metal body after being immersed in the stripping solution; a moisture removal device for removing moisture from the mixture washed with the cleaning liquid; and a separation device for separating the mixture into the synthetic resin and the metal body by applying a predetermined external force to the mixture; Prepare.

In the above composite material separate recovery system, the mixture is washed with the cleaning liquid after being immersed in the stripping solution contained in the stripping tank, so that the synthetic resin and the metal body separated and recovered from the composite material are separated into the stripping solution. It is possible to suppress the residual odor of the origin, thereby realizing excellent recyclability of the composite material. By removing water from the mixture after washing by the water remover, it is possible to prevent the peeled synthetic resin and the metal body from adhering to each other due to water. That is, a gap can be formed between the separated synthetic resin and the metal body. By applying an external force to the mixture having the gap thus formed, the sorting device can suitably sort the mixture into synthetic resin and metal bodies. Here, the composite material may be a sheet-like laminate of the synthetic resin and the metal foil. In this case, the sorting device applies the external force to a piece of the synthetic resin and/or the metal foil contained in the mixture, the piece having a size of a predetermined area or more. The resin and the metal foil may be separated. In this way, when the sorting apparatus applies an external force to a piece having a predetermined area or more, the external force acts over a wide range, and a relatively large force acts on the piece. can be made Therefore, it becomes possible to suitably separate the synthetic resin and the metal foil. As described above, it is possible to provide a separate collection technique that is excellent in recyclability. The composite material sorting and collecting system may further include an optical sorting device for sorting the synthetic resin from the mixture based on the reflection of the light irradiated to the mixture.

Here, in the composite material sorting and collecting system of the present disclosure, with respect to the external force acting on the piece having a size equal to or larger than the predetermined area, the sorting device includes a blower that blows air to the mixture, and the mixture You may separate by making a wind force act on. According to this, the wind from the fan acts on the gap formed between the peeled synthetic resin and the metal foil, and the wind power acts on a wide range of one piece having a size of a predetermined area or more. Thus, a relatively large force can be applied to the one piece. Therefore, it becomes possible to suitably separate the synthetic resin and the metal foil.

Further, in the composite material sorting and recovery system described above, the stripping solution is an aqueous solution of benzyl alcohol, and the composite material is immersed in the stripping solution at a liquid temperature of 70° C. or higher to remove the synthetic resin. It may be separated from the metal body. According to this, it is possible to suitably suppress the odor derived from the stripping solution from remaining in the synthetic resin and the metal body separated and collected from the composite material, and to shorten the stripping process time.

In addition, the present disclosure can be understood from the aspect of a separate collection method for composite materials. That is, the method for sorting and recovering a composite material of the present disclosure is a method for sorting and recovering a composite material in which the synthetic resin and the metal foil are separately recovered from the composite material in which the synthetic resin and the metal foil are laminated in a sheet form. a peeling step of immersing the composite material in a peeling solution to separate the composite material from the synthetic resin and the metal foil; and a mixture after the plurality of composite materials are immersed in the peeling solution. a cleaning step of cleaning the mixture containing the peeled synthetic resin and the metal foil; a water removing step of removing water from the washed mixture; and the water removing step while vibrating. A transport step of transporting the treated mixture, and a separation step of separating the mixture into the synthetic resin and the metal foil by applying a predetermined external force to the transported mixture. Then, in the separation step, the synthetic resin and/or the metal foil included in the mixture is subjected to the external force on a piece having a size equal to or greater than a predetermined area. and the metal foil.

Then, in the method for sorting and recovering composite materials of the present disclosure, in the sorting step, the synthetic resin and the metal foil may be sorted by applying wind force to the mixture with an air blower that blows air to the mixture.

Further, the method for sorting and recovering a composite material of the present disclosure is a method for sorting a composite material in which a synthetic resin and a metal body are separately recovered from a composite material in which a synthetic resin is laminated on a predetermined metal body in the form of a sheet. A recovery method comprising: a stripping step of immersing the composite material in a stripping solution to strip the synthetic resin from the metal body; and a mixture after a plurality of the composite materials are immersed in the stripping solution, a washing step of washing the mixture containing the peeled synthetic resin and the metal body; a water removal step of removing water from the washed mixture; and applying a predetermined external force to the mixture. a separation step of separating the mixture into the synthetic resin and the metal body, wherein the stripping solution is an aqueous solution of benzyl alcohol, and in the stripping step, the stripping solution has a liquid temperature of 70° C. or higher. The composite material may be immersed to separate the synthetic resin from the metal body.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a sorting and collecting technique excellent in recyclability for a composite material in which synthetic resin is laminated on a predetermined metal body in sheet form.

1 is a diagram showing a schematic configuration of a composite material sorting and collecting system according to a first embodiment; FIG. FIG. 4 is a diagram for explaining a peeling process of a PTP sheet using a peeling tank; FIG. 10 is a diagram for explaining the synthetic resin sheet and the aluminum foil after the moisture removal process, in comparison with the case where the moisture is not removed. It is a figure for demonstrating the fractionation collection|recovery process using a fractionation apparatus. 6 is a flow chart showing a processing flow of a method for sorting and collecting composite materials in a modification of the first embodiment; It is the 1st figure for demonstrating the modification of the classification collection|recovery process using a classification|fractionation apparatus. It is the 2nd figure for demonstrating the modification of the classification collection|recovery process using a classification|fractionation apparatus.

Embodiments of the present disclosure will be described below based on the drawings. The configurations of the following embodiments are examples, and the present disclosure is not limited to the configurations of the embodiments.

<First Embodiment>
An overview of the composite material sorting and collecting system according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a schematic configuration of a separate collection system for composite materials according to the present embodiment. A separate collection system 1 according to the present embodiment is a system that separates and collects synthetic resin and metal foil from a composite material in which synthetic resin and metal foil are laminated in a sheet form. In the present embodiment, the composite material is a sheet used for packaging capsules and tablets, and a synthetic resin sheet (for example, a polyvinyl chloride sheet) and an aluminum foil are joined with an adhesive without any gaps. An example of a PTP sheet will be described below.

As shown in FIG. 1, a separate collection system 1 according to the present embodiment includes a stripping tank 10 containing a stripping solution 100 and a cleaning tank 20 for cleaning the mixture after the PTP sheet 2 has been immersed in the stripping solution 100. , a water removing device 30 for removing water from the mixture, a conveyor 40 for conveying the mixture, and a separating device for separating the mixture conveyed by the conveyor 40 into a synthetic resin sheet (PVC sheet) and an aluminum foil. 50 and prepare.

Further, in the present embodiment, the sorting and collection system 1 is configured to have the conveying device 60 . The conveying device 60 is a device for conveying the metal mesh-like conveying container 3 in which the PTP sheet 2 is accommodated. and a holding portion that holds the transport container 3 . Then, using this transporting device 60, the transporting container 3 containing the PTP sheet 2 is immersed in the stripping solution 100 in the stripping bath 10, and then transported to the cleaning bath 20. 3 can be transported from the washing tank 20 to the moisture remover 30 .

Here, each component constituting the sorted collection system 1 will be described in detail below.

The peeling bath 10 contains a peeling solution 100 for immersing the PTP sheet 2 to separate the synthetic resin sheet (PVC sheet) and the aluminum foil. The peeling process of the PTP sheet 2 using this peeling tank 10 will be described with reference to FIG. FIG. 2 is a diagram for explaining the peeling process of the PTP sheet 2 using the peeling bath 10. As shown in FIG.

As shown in FIG. 2, the stripping bath 10 contains a stripping solution 100 . The stripping bath 10 is further provided with a temperature control device 11 . Here, the stripping solution 100 is an aqueous benzyl alcohol solution, and the PTP sheet 2 is immersed in the stripping solution 100 having a liquid temperature of 70° C. or higher. At this time, the liquid temperature of the stripping solution 100 is adjusted by the temperature control device 11 . The temperature control device 11 is a well-known temperature control device including a heater and a temperature sensor. temperature can be maintained.

Also, as shown in FIG. 2(a), the PTP sheet 2 is accommodated in the transport container 3. At this time, the PTP sheet 2 is accommodated in the transport container 3 without being crushed or crushed. In other words, the PTP sheets 2 are accommodated in the transport container 3 from the state in which they are collected after use or collected as defective products in the manufacturing process, without undergoing the steps of pulverization or crushing. As shown in FIG. 2(a), the PTP sheet 2 in the collecting state is a sheet in which a plurality of unit sheets forming a space for storing one tablet or the like are connected (each unit sheet of the sheet has a tablet or the like). are stored, a plurality of tablets or the like are stored in the sheet.) or a unit sheet forming a space for storing one tablet or the like.

Here, according to the prior art, the pulverized or crushed composite material is subjected to a predetermined treatment in order to separate and recover the synthetic resin and the metal foil from the composite material. However, in order to pulverize or crush the composite material, not only does the treatment process require a lot of labor and energy, but also the handling of the finely pulverized composite material becomes difficult, which adversely affects the recyclability of the composite material. There is also a risk that

On the other hand, according to the separated collection system of the present disclosure, by performing the peeling process on the composite material in the collected state, not only is the handling property of the composite material not deteriorated, but also the composite material can be separated. The improved yield of the entire recovery process improves the recyclability of the composite material. In addition, since the collected composite material is sorted and recovered, in the sorting device 50 described later, an external force is applied to a piece of synthetic resin and/or metal foil having a size equal to or larger than a predetermined area. is possible, and thus it becomes possible to preferably separate the synthetic resin and the metal foil.

Then, the transfer container 3 containing the PTP sheet 2 as described above is immersed in the stripping solution 100 in the stripping tank 10 as shown in FIG. 2(b). Here, as described above, since the transport container 3 is formed of the metal mesh, the PTP sheet 2 is immersed in the stripping solution 100 by immersing the transport container 3 in the stripping solution 100 .

When the PTP sheet 2 is immersed in the peeling solution 100 in this way, the adhesive that joins the synthetic resin sheet (PVC sheet) and the aluminum foil in the PTP sheet 2 without any gap is dissolved, and the PTP sheet 2 becomes a synthetic resin sheet. (PVC sheet) and aluminum foil. As described above, in this embodiment, the stripping solution 100 is a benzyl alcohol aqueous solution. Here, even if the peeling solution 100 is an amino-based solvent, it is possible to dissolve the adhesive in the PTP sheet 2 and peel the synthetic resin sheet (PVC sheet) from the aluminum foil. However, if an amino-based solvent is used in the stripping solution 100, even if the cleaning process described later is performed, the synthetic resin sheet (PVC sheet) and the aluminum foil separated and collected from the PTP sheet 2 will be separated from the stripping solution 100. The present disclosure person has found that the irritating odor of On the other hand, by using a benzyl alcohol aqueous solution as the stripping solution 100, it is possible to suppress the odor derived from the stripping solution 100 from remaining on the synthetic resin sheet (PVC sheet) and the aluminum foil separated and collected from the PTP sheet 2. was newly found.

Preferably, in the peeling step shown in FIG. 2, the PTP sheet 2 is immersed in a peeling solution 100 (benzyl alcohol aqueous solution) having a liquid temperature of 80° C. for 3 hours. According to this, the PTP sheet 2 can be suitably peeled from the synthetic resin sheet (PVC sheet) and the aluminum foil, and the time for the peeling process can be shortened as much as possible.

Further, as described above, according to the sorting and collecting system of the present disclosure, the composite material in the collected state is subjected to a peeling process. Therefore, it is not necessary to stir the stripping solution 100 in the stripping process described above. If the stripping treatment is performed on the pulverized or crushed composite material, the composite materials are densely overlapped in the stripping solution 100, so the composite material is sufficiently moved in the stripping solution 100. If the stripping solution 100 is not stirred, the stripping solution 100 may not sufficiently penetrate the composite material. On the other hand, since the composite material in the collected state has a predetermined size, the composite materials overlap each other with a gap in the stripping solution 100, and the stripping solution 100 can be removed even if the stripping solution 100 is not stirred. 100 can fully penetrate the composite material. This makes it possible to reduce energy for stirring. However, the stripping solution 100 may be stirred in the stripping process for the purpose of maintaining the mixed state of the solvent and the solute in the stripping solution 100 . Even in this case, the composite material is not stirred to the extent that the composite material is sufficiently moved in the stripping solution 100, so energy for stirring can be reduced as much as possible.

Returning to FIG. 1, the cleaning tank 20 is a mixture after immersing a plurality of PTP sheets 2 in the peeling solution 100 contained in the peeling tank 10, and is a peeled synthetic resin sheet (PVC sheet). containing a cleaning solution for cleaning the mixture containing the aluminum foil and the Then, the transfer container 3 containing the mixture is immersed in the cleaning liquid in the cleaning tank 20, and the mixture is immersed in the cleaning liquid, and the mixture is cleaned. At this time, the above-described conveying device 60 immerses the conveying container 3 containing the PTP sheet 2 in the stripping solution 100 of the peeling tank 10, then conveys the conveying container 3 to the cleaning tank 20, and removes the peeled synthetic resin. By immersing the mixture containing the sheet (PVC sheet) and the aluminum foil in the cleaning liquid in the cleaning tank 20, the peeling process and the cleaning process can be performed continuously.

Here, the cleaning liquid is, for example, a cleaning liquid containing a surfactant, a cleaning liquid containing a neutralizing agent for the stripping solution 100, hot water, or the like. By washing the above mixture with such a washing liquid, it is possible to prevent the odor from the stripping solution 100 from remaining on the synthetic resin sheet (PVC sheet) and the aluminum foil separated and collected from the PTP sheet 2. Therefore, excellent recyclability of the PTP sheet 2 can be realized.

The water removing device 30 is a device for removing water from the mixture washed with the cleaning liquid contained in the cleaning tank 20, and is, for example, a dehydrating device or a drying device. Also at this time, after the above-described conveying device 60 immerses the conveying container 3 containing the mixture of the synthetic resin sheet (PVC sheet) peeled from the PTP sheet 2 and the aluminum foil in the cleaning liquid of the cleaning tank 20, By transporting the transport container 3 to the water removing device 30 and putting the mixture into the water removing device 30, the water removing process can be carried out continuously.

By carrying out the water removal process of the mixture using such a water removal device 30, it is possible to suitably separate the synthetic resin sheet (PVC sheet) and the aluminum foil in the separation device 50 described later. Become. This will be explained in more detail below on the basis of FIG.

FIG. 3 is a diagram for explaining the synthetic resin sheet and the aluminum foil after the moisture removal process in comparison with the case where the moisture removal is not performed. Here, if the moisture is not removed from the above-mentioned mixture after washing, the synthetic resin sheet (PVC sheet) and the aluminum foil will adhere to each other due to moisture, as shown in FIG. 3(a). On the other hand, when the moisture removal step is performed, a gap can be formed between the peeled synthetic resin sheet (PVC sheet) and the aluminum foil, as shown in FIG. 3(b). As a result, it becomes possible to suitably separate the synthetic resin sheet (PVC sheet) and the aluminum foil in the separating device 50, which will be described later. It is desirable that the moisture remover 30 remove as much moisture as possible from the mixture, but it is not necessary to completely remove the moisture from the mixture.

Returning to FIG. 1, the conveyor 40 is a conveyor for conveying the mixture treated by the moisture remover 30, and conveys the mixture while vibrating it. Here, the conveyor 40 may be of any type as long as it can convey objects while vibrating them, and is, for example, a well-known vibration conveyor equipped with a vibration motor (vibrator). The conveyor 40 conveys the mixture of the synthetic resin sheet (PVC sheet) and the aluminum foil from the water remover 30 to the sorting device 50 . According to this, since the mixture can be conveyed from the water removing device 30 to the separating device 50 while being vibrated, it is possible to suppress the situation in which the synthetic resin sheet (PVC sheet) and the aluminum foil overlap each other during this conveying process. can. In addition, even if moisture remains in the synthetic resin sheet and aluminum foil after the moisture removal process, the situation in which the synthetic resin sheet (PVC sheet) and the aluminum foil are brought into close contact with each other due to the moisture during the transportation process is suppressed. be able to.

The sorting device 50 then accommodates the mixture conveyed by the conveyor 40 . The sorting device 50 separates the mixture into a synthetic resin sheet (PVC sheet) and an aluminum foil by applying a predetermined external force to the mixture. In this embodiment, the sorting device 50 includes a blower 51 that blows air to the mixture, and separates the mixture into a synthetic resin sheet (PVC sheet) and an aluminum foil by applying wind force to the mixture. Note that the blower 51 is a device that blows air by rotating an impeller, and a well-known fan or the like can be used.

Here, a separate recovery process for separating and recovering the synthetic resin sheet (PVC sheet) and the aluminum foil from the PTP sheet 2 will be described with reference to FIG. FIG. 4 is a diagram for explaining the sorting and collecting process using the sorting device 50. As shown in FIG.

As shown in FIG. 4( a ), the sorting device 50 accommodates a plurality of mixtures (a plurality of PTP sheets 2 separated into synthetic resin sheets and aluminum foils) conveyed by the conveyor 40 . Then, the air from the blower 51 is supplied to the mixture contained in the sorting device 50 .

Then, as shown in FIG. 4(b), wind acts on the gap between the synthetic resin sheet (PVC sheet) and the aluminum foil. Here, according to the separate collection system 1 of the present disclosure, as described above, the peeled synthetic resin sheet (PVC sheet) and the aluminum foil are in close contact due to the moisture removal process and the conveying process by the conveyor 40. is suppressed. Therefore, the air from the blower 51 acts on the gap formed between the peeled synthetic resin sheet (PVC sheet) and the aluminum foil.

Then, in this sorting and collecting step, a piece of the synthetic resin sheet (PVC sheet) and/or aluminum foil contained in the mixture, which has a size equal to or greater than a predetermined area, is subjected to wind force from the blower 51. are separated into a synthetic resin sheet (PVC sheet) and an aluminum foil. Here, as described above, in the separated collection system 1 of the present disclosure, the PTP sheets 2 in the collected state are subjected to peeling, washing, moisture removal, and separation processing. The PTP sheet 2 in the collecting state is in the state of a sheet in which a plurality of unit sheets are connected or in the state of a unit sheet. Therefore, a piece having a size equal to or larger than the predetermined area becomes a piece having a size of a sheet in which a plurality of unit sheets are connected, or a piece having a size of a unit sheet. In other words, the predetermined area of the present disclosure is an area defined by at least the size of the unit sheet. For example, when the unit sheet has a size of 1 cm x 1 cm, the predetermined area is 1 square cm. becomes.

In this way, by applying wind force to one piece having a size of a predetermined area or more, it becomes possible to apply a larger force to the one piece, and the synthetic resin sheet (PVC sheet) and the aluminum foil are combined. and can be suitably separated. Here, the example shown in FIG. 4 is a case in which a wind force acts on a piece having the size of a sheet in which a plurality of unit sheets are connected, and as shown in FIG. When the wind force acts on the range, the synthetic resin sheet (PVC sheet) having a smaller specific gravity than the aluminum foil is blown away by the wind, and the synthetic resin sheet (PVC sheet) is collected on the leeward side. In this way, the synthetic resin sheet (PVC sheet) and the aluminum foil can be separately recovered from the mixture. It should be noted that even if the air volume from the blower 51 is relatively small, a relatively large force can be applied to the piece by applying the wind force over a wide range of the piece having a size equal to or larger than the predetermined area. , it becomes possible to reduce energy for separate collection. In addition, by performing the sorting and collecting process on a piece having a size of a predetermined area or more, the handling of the composite material is not deteriorated, and the yield is higher than that of pulverized or crushed composite materials. Good sorting and recovery process can be carried out, so the recyclability of the composite material is improved.

The aluminum foil separated and collected as described above is put into, for example, a hydrogen generator that generates hydrogen by reacting aluminum with an alkaline solution, and the generated hydrogen is used to generate power. recycled. Further, synthetic resin sheets (PVC sheets) are, for example, crushed and then molded into arbitrary shapes and recycled.

According to the sorting and collecting system 1 described above, it is possible to provide a sorting and collecting technique excellent in recyclability for a composite material in which a synthetic resin and a metal foil are laminated in a sheet form.

<Modified Example of First Embodiment>
A modification of the first embodiment will be described with reference to FIG. This modified example is a method for sorting and recovering a composite material in which the synthetic resin and the metal foil are separately recovered from the composite material in which the synthetic resin and the metal foil are laminated in a sheet form.

FIG. 5 is a flow chart showing the processing flow of the method for sorting and collecting composite materials in this modification.

In this flow, first, a peeling step is executed in S101. In the process of S101, the composite material is immersed in a stripping solution to separate the composite material from the synthetic resin and the metal foil. The details of this peeling step are as described in the description of the first embodiment.

Next, at S102, a cleaning step is performed. In the process of S102, the mixture after immersing the plurality of composite materials in the stripping solution, which is the mixture containing the stripped synthetic resin and the metal foil, is washed. The details of this cleaning step are as described in the description of the first embodiment.

Next, in S103, a moisture removal step is performed. In the process of S103, water is removed from the washed mixture. The details of this moisture removal step are as described in the description of the first embodiment.

Next, in S104, a transport step is executed. In the process of S104, the mixture processed in the moisture removal step is conveyed while being vibrated. The details of this transport step are as described in the description of the first embodiment.

Next, in S105, a sorting step is performed. In the process of S105, a predetermined external force is applied to the conveyed mixture to separate the mixture into synthetic resin and metal foil. The details of this sorting step are as described in the description of the first embodiment. After the processing of S105, the execution of this flow is ended, and the synthetic resin and the metal foil are separated and collected from the composite material.

Also, by the method for sorting and recovering composite materials described above, it is possible to provide a sorting and recovering technique excellent in recyclability for composite materials in which synthetic resin and metal foil are laminated in a sheet form.

<Other Modifications>
The above-described embodiment is merely an example, and the present disclosure can be modified as appropriate without departing from the scope of the present disclosure. In the above embodiment, an example of separately collecting a synthetic resin sheet and an aluminum foil from a PTP sheet has been described. It may be used in a multi-layer film for packaging consisting of a synthetic resin layer and a metal foil layer.

Further, in the above embodiment, an example in which the mixture housed in the sorting device 50 is separated into a synthetic resin sheet (PVC sheet) and an aluminum foil by applying wind force from the blower 51 has been described, but the present disclosure The sorting device in the separate collection system for composite materials is not limited to such a sorting device 50 . The separate collection system 1 may include, for example, a separating device that separates the contained mixture into a synthetic resin sheet (PVC sheet) and an aluminum foil by applying a magnetic force or an electrostatic force.

Here, FIG. 6 is a first diagram for explaining a modification of the sorting and collecting process using the sorting device. The sorting device in the example shown in FIG. 6 has a neodymium magnet 52 . Then, the magnetic force from the neodymium magnet 52 is applied to a piece of synthetic resin sheet (PVC sheet) and/or aluminum foil contained in the mixture accommodated in the sorting device and having a size equal to or larger than a predetermined area. It separates into a synthetic resin sheet (PVC sheet) and an aluminum foil by making it act. In this case, as shown in FIG. 6 , the aluminum foil is attracted to the neodymium magnet 52 and collected by the neodymium magnet 52 . In this way, the synthetic resin sheet (PVC sheet) and the aluminum foil can be separately recovered from the mixture. In addition, since the magnetic force acts on a wide range of a piece having a predetermined area or more, a relatively large force can be applied to the piece, so the synthetic resin sheet (PVC sheet) and the aluminum foil It becomes possible to separate suitably.

In addition, when the sorting device separates the synthetic resin sheet (PVC sheet) and the aluminum foil by applying an electrostatic force to the contained mixture, the sorting device has, for example, an electrostatic adsorption board. good too.

Further, the sorting and collecting system for composite materials of the present disclosure may include a specific gravity sorting device and an optical sorting device as sorting devices. FIG. 7 is a second diagram for explaining a modification of the sorting and collecting process using the sorting device. The sorting device in the example shown in FIG. 7 has a specific gravity sorting device 53 and an optical sorting device 54 . Here, the specific gravity sorter 53 can, for example, immerse the mixture in a liquid having a predetermined specific gravity, and separate the metal and the synthetic resin into an upper layer portion and a lower layer portion in the liquid based on the difference in specific gravity. Further, the optical sorting device 54 is a device for sorting the synthetic resin from the mixture based on the reflection of the light irradiated to the mixture. A composite material sorting and collecting system equipped with these devices can also sort and collect composite materials in which a sheet of synthetic resin is laminated on a predetermined metal body with high recyclability.

In a composite material sorting and collecting system including a stripping tank 10 containing a predetermined stripping solution 100, a cleaning tank 20, a water removing device 30, and a sorting device 50, It is also possible to suitably carry out sorted collection of the synthetic resin sheets.

REFERENCE SIGNS LIST 1 Separate collection system 2 PTP sheet 10 Peeling tank 100 Peeling solution 20 Cleaning tank 30 Moisture remover 40 Conveyor 50... Sorting device

Claims (2)

A composite material sorting and collecting system for separately recovering a synthetic resin and a metal body from a composite material in which a synthetic resin is laminated on a predetermined metal body in a sheet form,
a stripping bath containing a stripping solution for immersing the composite material to strip the synthetic resin from the metal body;
A mixture after immersing a plurality of the composite materials in the stripping solution contained in the stripping bath, the cleaning liquid for cleaning the mixture containing the stripped synthetic resin and the metal body. a washing tank with
a water removal device for removing water from the mixture washed with the cleaning liquid contained in the cleaning tank;
a sorting device that separates the mixture into the synthetic resin and the metal body by applying a predetermined external force to the mixture;
with
The stripping solution is an aqueous solution of benzyl alcohol, and the composite material is immersed in the stripping solution having a liquid temperature of 70° C. or higher to strip the synthetic resin from the metal body.
Separate collection system for composite materials. A composite material sorting and recovering method for separately recovering a synthetic resin and a metal body from a composite material in which a synthetic resin is laminated on a predetermined metal body in the form of a sheet, the method comprising:
a stripping step of immersing the composite material in a stripping solution to strip the synthetic resin from the metal body;
a cleaning step of cleaning a mixture after the plurality of composite materials have been immersed in the stripping solution, the mixture containing the stripped synthetic resin and the metal body;
a moisture removal step of removing moisture from the washed mixture;
a separation step of separating the mixture into the synthetic resin and the metal body by applying a predetermined external force to the mixture;
has
The stripping solution is an aqueous solution of benzyl alcohol, and in the stripping step, the composite material is immersed in the stripping solution having a liquid temperature of 70° C. or higher to strip the synthetic resin from the metal body.
A separate collection method for composite materials.

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