Method for separating waste and apparatus for separating waste

Abstract

The object of the present invention is to provide a waste separation method and waste separation apparatus that improve the separation of synthetic resin and metal foil. [Solution] The waste separation method involves heating the waste, in which metal foil is bonded to a synthetic resin via an adhesive layer, to a temperature above the softening point and below the melting point of the adhesive layer. After heating, the waste, heated to a temperature above the softening point and below the melting point of the adhesive layer, is struck to separate the synthetic resin from the metal foil. After separation, the synthetic resin and metal foil are separated.

Description

Technical Field

[0001] The present invention relates to a method for separating waste and a waste separation device, and particularly to a waste separation method and a waste separation device for improving the separation of synthetic resin and metal foil.

Background Art

[0002] Conventionally, there is an aluminum foil / resin separation method capable of efficiently and continuously separating and recovering aluminum foil and synthetic resin from synthetic resin waste containing metal foil, for example, aluminum foil (see Patent Document). This aluminum foil / resin separation method blows hot air into the separation chamber (1) and heats the temperature inside the chamber to about 80°C to about 100°C while rotationally driving the rotor (16) to separate the aluminum foil adhered to the synthetic resin waste while pulverizing it. The pulverized and separated aluminum foil is sent to the aluminum recovery chamber (3) through the porous bottom plate (13) on the lower side of the separation chamber (2). The synthetic resin is sent to the resin recovery chamber (4) adjacent to the separation chamber 2 by the rotation of the rotor (16). The aluminum foil is recovered from the aluminum recovery chamber (3), and the synthetic resin is recovered from the resin recovery chamber (4).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above aluminum foil / resin separation method, since the waste with the aluminum foil adhered to the synthetic resin is pulverized while being heated, there are cases where the waste is pulverized with insufficient heating, and when the synthetic resin and the aluminum foil cannot be separated and are pulverized, the waste with the aluminum foil adhered to the synthetic resin is pulverized into small pieces, and after the pulverization, it is difficult to separate the small pieces of synthetic resin and aluminum foil.

[0005] The present invention aims to provide a waste separation method and waste separation apparatus that improve upon the problems of the conventional technology described above. [Means for solving the problem]

[0006] The waste separation method according to claim 1 involves heating the waste, in which a metal foil is bonded to a synthetic resin via an adhesive layer, to a temperature above the softening point and below the melting point of the adhesive layer; after heating, the waste, which has been heated to a temperature above the softening point and below the melting point of the adhesive layer, is struck to separate the synthetic resin and the metal foil; and after separation, the synthetic resin and the metal foil are separated.

[0007] Furthermore, the waste separation method described in claim 2 is the waste separation method described in claim 1, wherein a refiner is used as a means for striking the waste, the synthetic resin is a film-like member, the waste heated to a temperature above the softening point of the adhesive layer and below the melting point is supplied to the refiner, the metal foil is peeled off from the film-like member by the refiner and the metal foil is crushed, and after crushing, the film-like member and the crushed metal foil are separated.

[0008] Furthermore, the waste separation method described in claim 3 is the waste separation method described in claim 1, wherein a refiner is used as a means for striking the waste, the synthetic resin is a film-like member, the waste heated to a temperature above the softening point of the adhesive layer and below the melting point is supplied to the refiner, the metal foil is peeled off from the film-like member by the refiner and the metal foil is crushed, and after crushing, the film-like member and the crushed metal foil are separated, and the hot air of the waste discharged from the refiner is guided to the refiner.

[0009] Furthermore, the waste separation apparatus described in claim 4 comprises: a heating device that heats waste in which a metal foil is bonded to a synthetic resin film-like member via an adhesive layer to a temperature above the softening point and below the melting point of the adhesive layer; a refiner that receives and beats the waste heated by the heating device to a temperature above the softening point and below the melting point of the adhesive layer; and a separation apparatus that separates the film-like member and the crushed metal foil after the metal foil has been peeled off by the refiner and the metal foil has been crushed.

[0010] Furthermore, the waste separation apparatus according to claim 5 is provided with a heat recovery passage connecting the refiner and the separation apparatus, a heat recovery apparatus provided in the middle of the heat recovery passage, the heat recovery apparatus being a funnel-shaped member that is wide at the top and narrows at the bottom, the heat recovery passage being provided to guide the peeled metal foil and film-like member from the lower part of the funnel-shaped member to the separation apparatus and to guide the hot air from the side closer to the upper part of the funnel-shaped member from the lower part of the funnel-shaped member to the refiner. [Effects of the Invention]

[0011] Conventional methods involve heating and crushing waste materials in which metal foil is adhered to synthetic resin. However, if the waste is not sufficiently heated before crushing, the synthetic resin and metal foil remain attached, resulting in the crushing of the waste material and making separation of the synthetic resin and metal foil difficult afterward. According to the waste separation method described in claim 1, the aforementioned problem can be improved by heating the waste, in which metal foil is bonded to a synthetic resin via an adhesive layer, to a temperature above the softening point and below the melting point of the adhesive layer, then striking the waste heated to a temperature above the softening point and below the melting point of the adhesive layer to separate the synthetic resin and the metal foil, and finally separating the synthetic resin and the metal foil after separation.

[0012] Furthermore, according to the waste separation method described in claim 2, in addition to the effects of the invention described in claim 1 described above, the waste heated to a temperature above the softening point and below the melting point of the adhesive layer is supplied to a refiner, the metal foil is peeled off from the film-like member by the refiner and the metal foil is crushed, and after crushing, the film-like member and the crushed metal foil are separated, thereby improving the aforementioned problems.

[0013] Furthermore, according to the waste separation method described in claim 3, in addition to the effects of the invention described in claim 1 above, the waste heated to a temperature above the softening point of the adhesive layer but below its melting point is supplied to a refiner, the metal foil is peeled off from the film-like member by the refiner and the metal foil is crushed, and after crushing, the film-like member and the crushed metal foil can be separated. Moreover, by guiding the hot air of the waste discharged from the refiner to the refiner, a drop in temperature inside the refiner is prevented, so as not to hinder the softening of the adhesive layer, and the peeling of the synthetic resin and the metal foil can be facilitated.

[0014] Conventional methods involve heating and crushing waste materials in which metal foil is adhered to synthetic resin. However, if the waste is not sufficiently heated before crushing, the synthetic resin and metal foil remain attached, resulting in the crushing of the waste material and making separation of the synthetic resin and metal foil difficult afterward. According to the waste separation apparatus described in claim 4, the waste heated to a temperature above the softening point and below the melting point of the adhesive layer is supplied to a refiner, the metal foil is peeled off from the film-like member by the refiner and the metal foil is crushed, and after crushing, the film-like member and the crushed metal foil are separated, thereby improving the aforementioned problem.

[0015] Furthermore, according to the waste separation apparatus described in claim 5, in addition to the effects of the invention described in claim 4 above, a heat recovery passage is provided connecting the refiner and the separation apparatus, and a heat recovery device is provided in the middle of this heat recovery passage. The heat recovery device is a funnel-shaped member that is wide at the top and narrows at the bottom. The metal foil and film-like member peeled off from the lower part of the funnel-shaped member are guided to a separation device. Since a heat recovery passage is provided that guides hot air from the lower part of the funnel-shaped member to the refiner from the side closer to the upper part of the funnel-shaped member, a drop in temperature inside the refiner is prevented, and the softening of the adhesive layer is not inhibited, making it possible to easily separate the synthetic resin from the metal foil. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a schematic diagram of a waste separation device according to one embodiment of the present invention. [Modes for carrying out the invention]

[0017] A waste separation method and waste separation apparatus according to one embodiment of the present invention will be described with reference to Figure 1.

[0018] In Figure 1, D is a waste separation device. The waste separation device D comprises a heating device 1 that heats waste, in which metal foil (e.g., aluminum foil) is bonded to a synthetic resin via an adhesive layer, to a temperature above the softening point and below the melting point of the adhesive layer (for example, 80°C or higher, preferably 80°C to 120°C, more preferably 100°C to 120°C); a refiner 2 that beats the heated waste; and a separation device 3 that separates the peeled film-like member and the crushed aluminum foil discharged from the refiner 2.

[0019] The heating device 1 guides the waste in which a metal foil (e.g., aluminum foil) is adhered to the supplied film-like member from the supply port 13 to the discharge port 14 by means of a spiral guide 12 provided on the outer periphery of the rotary drum 11. The heating device 1 heats the waste in which a metal foil (e.g., aluminum foil) is adhered to a synthetic resin through an adhesive layer to a temperature not lower than the softening point and not higher than the melting point of the adhesive layer. As the heating means, for example, a heat transfer type heating device such as a heater (not shown) provided on the inner periphery of the rotary drum 11 or a heater (not shown) provided on the inner wall of the casing 15 of the heating device 1, a radiative heating device such as a near-infrared heating IRD (infrared drying drum) or microwave heating, a hot air type heating device such as a hopper dryer or a box-type drying furnace, a hot air type heating device such as a hopper dryer or a box-type drying furnace.

[0020] The refiner 2 is used in a paper-making machine and beats raw materials [in this embodiment, waste in which an aluminum foil is attached to a synthetic resin (e.g., waste in which an aluminum foil is attached to a film-like member)] between a disk-shaped stator (not shown) and a disk-shaped rotor (not shown). The distance between the fixed blade disk and the rotating blade disk can be adjusted to 0.15 - 9.0 mm and can correspond to the type of waste. In addition to the disk shape, a conical shape or a drum shape can be used as the type of the refiner. 21 is the supply port of the refiner 2. Although not shown, a suction device (not shown) is provided at the outlet 22 of the refiner 2. Inside the refiner 2, the metal foil (e.g., aluminum foil) is peeled off from the film-like member and the metal foil (e.g., aluminum foil) is pulverized, and the film-like member (not shown) and the pulverized metal foil (e.g., aluminum foil) can be guided to the outlet 22.

[0021] The film-like member (not shown) and the pulverized metal foil (e.g., aluminum foil) discharged from the outlet 22 are guided to the separator 3 through the heat recovery device 5 and the supply port 33. The separating device 3 has a spiral guide 32 provided on the inner surface of a rotating drum 31 having a mesh on its outer periphery. The supplied film-like member (not shown shown shown) and the crushed metal foil (e.g., aluminum foil) move from the left side to the right side in FIG. 1. The film-like member (not shown) cannot pass through the mesh of the rotating drum 31 and goes to the discharge port 34. The crushed metal foil (e.g., aluminum foil) is respectively guided through the mesh of the rotating drum 31 to the weight discharge port 35, and can be separated into a synthetic resin (e.g., film-like member) and a metal foil (e.g., aluminum foil). In the present invention, the separating device 3 is not limited to the separating device 3 described above. For example, a separating device such as a vibration sorter or a wet method (not shown) can be used.

[0022] Preferably, a heat recovery device 5 is provided between the refiner 2 and the separating device 3, and a heat recovery passage 4 is provided at the supply port of the refiner 2 for this heat recovery device 5. 6 is a blower. V1 shown in FIG. 1 is the first valve, V2 is the second valve, H is a heater, and P is a bypass passage. The heat recovery device 5 is a funnel-shaped member with a wide upper part and a narrow lower part. It guides the aluminum foil and the film-like member crushed from below the funnel-shaped member to the separating device 3, and is provided with a heat recovery passage 4 that guides the hot air from the side closer to the upper part of the funnel-shaped member from below the funnel-shaped member to the refiner 2. Normally, the first valve V1 and the second valve V2 are controlled so that the hot air of the heat recovery device 5 does not pass through the bypass passage P, and the hot air of the waste discharged from the refiner 2 is guided to the refiner 2 through the heat recovery device 5 and the heat recovery passage 4. When the temperature in the refiner 2 drops, the first valve V1 and the second valve V2 are controlled to be guided to the refiner 2 through the heat recovery device 5, the heat recovery passage 4, and the heater H.

[0023] As a means of beating the waste, a refiner 2, which is common in papermaking machines that beat and loosen the waste, can be used. That is, waste heated to a temperature above the softening point of the adhesive layer but below the melting point (for example, 80°C or higher, preferably 80°C to 120°C, more preferably 100°C to 120°C) is supplied to the refiner 2, and the metal foil (for example, aluminum foil) is peeled off from the film-like member by the refiner 2 and the metal foil (for example, aluminum foil) is crushed, and after crushing, the film-like member and the crushed metal foil (for example, aluminum foil) can be separated by the separation device 3.

[0024] Conventional methods involve heating and crushing waste materials in which metal foil is adhered to synthetic resin. However, if the waste is not sufficiently heated before crushing, the synthetic resin and metal foil remain attached, resulting in the crushing of the waste material and making separation of the synthetic resin and metal foil difficult afterward. According to the waste separation method of this embodiment, the aforementioned problem can be improved by heating the waste, in which a metal foil (e.g., aluminum foil) is bonded to a synthetic resin via an adhesive layer, to a temperature above the softening point and below the melting point of the adhesive layer, then striking the waste heated to a temperature above the softening point and below the melting point of the adhesive layer to separate the synthetic resin from the metal foil (e.g., aluminum foil), and finally separating the synthetic resin from the metal foil (e.g., aluminum foil). Furthermore, the separated synthetic resin and aluminum foil can be recycled.

[0025] The waste separation device D of this embodiment includes a heating device 1 that heats waste, in which a metal foil (e.g., aluminum foil) is bonded to a synthetic resin film-like member via an adhesive layer, to a temperature above the softening point and below the melting point of the adhesive layer; a refiner 2 that receives and beats the waste heated by the heating device 1 to a temperature above the softening point and below the melting point of the adhesive layer; and a separation device 3 that separates the film-like member and the crushed metal foil (e.g., aluminum foil) after the metal foil (e.g., aluminum foil) is peeled off from the film-like member by the refiner 2. In other words, conventional methods involve heating and crushing waste materials in which metal foil is adhered to synthetic resin. If the waste is not heated sufficiently before crushing, the synthetic resin and metal foil will not be able to separate, resulting in the crushing of the waste materials in which the metal foil is adhered to the synthetic resin, and making it difficult to separate the synthetic resin and metal foil after crushing. According to the waste separation device D of this embodiment, waste heated to a temperature above the softening point and below the melting point of the adhesive layer is supplied to the refiner 2, where the metal foil (e.g., aluminum foil) is peeled off from the film-like member and crushed. After crushing, the film-like member and the crushed metal foil (e.g., aluminum foil) are separated by the separation device 3, thereby improving the aforementioned problem.

[0026] If we consider the waste separation device D of this embodiment from the perspective of the method invention, the waste separation method is: Waste materials in which a metal foil (e.g., aluminum foil) is bonded to a synthetic resin via an adhesive layer are heated to a temperature above the softening point and below the melting point of the adhesive layer (for example, 80°C or higher, preferably 80°C to 120°C (more preferably 100°C to 120°C)). After heating, the waste materials heated to a temperature above the softening point and below the melting point of the adhesive layer are struck to separate the synthetic resin from the metal foil (e.g., aluminum foil). After separation, the synthetic resin and the metal foil (e.g., aluminum foil) are separated. Furthermore, a refiner 2 is used as a means of crushing the waste, and the synthetic resin is a film-like member. The waste, heated to a temperature above the softening point of the adhesive layer but below its melting point, is supplied to the refiner 2. The refiner 2 peels the metal foil (e.g., aluminum foil) from the film-like member and crushes the metal foil (e.g., aluminum foil). After crushing, the film-like member and the crushed metal foil (e.g., aluminum foil) can be separated by a separation device 3.

[0027] Furthermore, if the amount of heat in the heat recovery passage 4 is insufficient, as shown in Figure 1, a bypass passage P can be provided in the middle of the heat recovery passage 4 via a first valve V1 and a second valve V2, a heater H can be provided in the middle of the bypass passage P, and the first valve V1 and the second valve V2 can be opened to guide the hot air from the waste discharged from the refiner 2 back to the refiner 2 via the heat recovery device 5, the heat recovery passage 4, and the bypass passage P. [Explanation of symbols]

[0028] D Waste separation device 1 Heating device 2 Refiners 3 Separation device 4. Heat recovery passage 5. Heat Recovery System 6. Blower 11-speed drum 12 spiral guides 13 Supply port 14 Outlet 15 Casing 21 Supply port 22 Exit 31 RPM drum 32 spiral guides 33 Supply port 34 Outlet 35 Weight outlet

Claims

1. Waste materials in which metal foil is bonded to synthetic resin via an adhesive layer are heated to a temperature above the softening point and below the melting point of the adhesive layer, and after heating, The waste material, heated to a temperature above the softening point but below the melting point of the adhesive layer, is struck to separate it into the synthetic resin and the metal foil. After separation, the synthetic resin and the metal foil are separated. A method for separating waste characterized by the following.

2. As a means of crushing waste, a refiner is used. Synthetic resin is a film-like component, The waste, heated to a temperature above the softening point and below the melting point of the adhesive layer, is supplied to the refiner, where the metal foil is peeled from the film-like member and the metal foil is crushed. After crushing, the film-like member and the crushed metal foil are separated. The waste separation method according to claim 1, characterized in that it is a feature of the present invention.

3. As a means of crushing waste, a refiner is used. Synthetic resin is a film-like component, The waste, heated to a temperature above the softening point and below the melting point of the adhesive layer, is supplied to the refiner, where the metal foil is peeled from the film-like member and the metal foil is crushed. After crushing, the film-like member and the crushed metal foil are separated. The hot air from the waste discharged from the refiner is guided back into the refiner. The waste separation method according to claim 1, characterized in that it is a feature of the present invention.

4. A heating device for heating waste materials, in which metal foil is bonded to a synthetic resin film-like member via an adhesive layer, to a temperature above the softening point and below the melting point of the adhesive layer, A refiner receives the waste, which has been heated by this heating device to a temperature above the softening point and below the melting point of the adhesive layer, and beats it. This refiner peels the metal foil from the film-like member and also crushes the metal foil. A separation device for separating the film-like member and the crushed metal foil after crushing, It is equipped with A waste separation device characterized by the following.

5. A heat recovery passage is provided connecting the refiner and the separation device, and a heat recovery device is installed midway through this heat recovery passage. The heat recovery device is a funnel-shaped member that is wide at the top and narrows at the bottom. The metal foil and film-like member peeled off from the lower part of the funnel-shaped member are guided to a separation device. A heat recovery passage is provided to guide hot air from the lower part of the funnel-shaped member towards the refiner. The waste separation apparatus according to claim 4, characterized in that it is a waste separation apparatus.

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