A composite paper substrate packaging box resource recycling system and method

Abstract

The present application relates to milk product packaging box recycling technical field, especially to a kind of composite paper substrate packaging box resource recycling system, including squeezing device, the squeezing device is used for the punching of packaging box;Separation device, the separation device includes separation tank body, separation tank body top is provided with feed inlet, vertical filter screen is arranged in separation tank body, the filter screen and the first separation chamber are formed with the side wall in separation tank body, the first separation chamber bottom end is provided with first discharge outlet for discharging paper pulp, the filter screen and the second separation chamber are formed with the other side of separation tank body, second separation chamber side wall is provided with second discharge outlet for discharging plastic film, the third discharge outlet for discharging aluminum foil is provided in second separation chamber bottom portion.The squeezing device can be quickly fed and discharged;The separation device separation process is simple and complete, and cost is low, and the purity of plastic film and aluminum foil after separation is high, and plastic film and aluminum foil will not be consumed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of composite packaging material separation, and particularly relates to a composite paper substrate packaging box resource recycling system and method. BACKGROUND

[0002] In daily life, milk has become a daily necessity for ordinary people. In order to make milk have a long storage time and be fresh, many products on the market are packaged by packaging boxes, especially composite paper substrate packaging boxes, which contain high-quality paper pulp, plastic film, aluminum foil and the like. Due to the continuous growth of consumption, there are a large number of expired milk or unqualified milk in some supermarkets that cannot be sold out in time. If these unqualified or expired milk products are discarded, it may cause pollution to nature and waste renewable resources. Therefore, these materials can be recycled and reused.

[0003] In the prior art, in the separation process, the packaging box is first crushed, and then the paper pulp in the paper-aluminum-plastic packaging box is separated out, and the remaining aluminum-plastic is mainly separated by physical and chemical methods. The physical method mainly uses the different melting points of aluminum and plastic (the melting point of aluminum is 660 DEG C, and the melting point of plastic film is 100-130 DEG C) to pyrolyze and gasify the plastic film and recover the aluminum foil, but this method causes a large amount of waste of plastic film. Or the separation is carried out by a vibrating screen method, which is complex and not complete. The chemical method mainly uses the property of aluminum dissolving in acid and alkali to dissolve aluminum with acid or alkali to recover the plastic film. However, this method has problems such as long reaction time, incomplete separation, and difficulty in extracting aluminum from the solution. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a composite paper substrate packaging box resource recycling system, which comprises a pressing device for punching the packaging box; a separation device comprising a separation tank body, the separation tank body being provided with a feeding port at the top, a filter screen being vertically arranged in the separation tank body, the filter screen and one side wall in the separation tank body forming a first separation chamber, the first separation chamber being provided with a first discharge port for discharging paper pulp at the bottom end, the filter screen and the other side of the separation tank body forming a second separation chamber, the second separation chamber being provided with a second discharge port for discharging plastic film on the side wall, the second separation chamber being provided with a third discharge port for discharging aluminum foil at the bottom, the first discharge port being provided with a first control valve, the second discharge port being provided with a second control valve, and the third discharge port being provided with a third control valve.

[0005] Preferably, a stirring rod is arranged in the second separation chamber, one end of the stirring rod penetrating through the top of the separation tank body and being connected with a driving motor, and a plurality of stirring blades are arranged on the stirring rod, the plurality of stirring blades being equidistantly and staggeredly distributed.

[0006] Preferably, an insulation layer is arranged on the separation tank body.

[0007] Preferably, a water spraying head is arranged in the second separation chamber, and one end of the water spraying head is connected to a water source.

[0008] Preferably, a controller is arranged on one side of the outer wall of the separation tank body, and the controller is signal connected to the first control valve, the second control valve and the third control valve.

[0009] Preferably, a liquid inlet is further arranged on the top of the separation tank body.

[0010] The application further provides a method for separating paper, aluminum foil and plastic film by using the above system, which comprises the following steps,

[0011] S1: In the pressing device, a round hole with a diameter of 2-5 mm is punched on the packaging box;

[0012] S2: The packaging box after being punched is put into the separation tank body through the feeding port, and water is injected into the separation tank body through the liquid inlet to soak and stir the packaging box;

[0013] S3: After the stirring is stopped, the first control valve and the water spraying head are opened to discharge the paper pulp;

[0014] S4: After the paper pulp is discharged, the water spraying head and the first control valve are closed, and a mixed solution of water, acetic acid and white wine is injected into the separation tank body through the liquid inlet to soak and stir;

[0015] S5: After repeating step 3, the first control valve and the water spraying head are closed, a certain amount of concentrated brine is injected into the separation tank body through the liquid inlet, and stirring is performed for 2-5 minutes at the same time to make the aluminum foil and the plastic film suspended;

[0016] S6: The stirring work is stopped, and after 3-5 minutes of static state, the second control valve is opened to discharge the plastic film floating on the liquid from the second discharge port;

[0017] S7: The second control valve is closed, and the third control valve is opened to discharge the aluminum foil from the third discharge port.

[0018] Preferably, the temperature of the water injected in S2 is 60-75°, and the mass ratio of the packaging box to water is 1:3.5-5.

[0019] Preferably, the ratio of water, acetic acid and white wine in S4 is 1:0.5:0.5-1:1.5:1.5.

[0020] Preferably, the concentration of the brine in S5 is not less than 10%.

[0021] The technical scheme adopted by the application can achieve the following beneficial effects:

[0022] In the system, the pressing device is simple, reasonable and compact in structure, can continuously punch the packaging box, can achieve rapid feeding and discharging, rapid and accurate punching, high punching efficiency and good effect. The paper-plastic-aluminum separation can be completed in one separation device, the separation process is simple and complete, the raw materials used for separation are mainly water, acetic acid, ordinary white wine and industrial salt, so the cost is low, the purity of the separated plastic film and aluminum foil is high, the process is environmentally friendly and will not cause waste of plastic film and aluminum foil. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the separation device in the application.

[0024] Figure 2 It is a structural schematic view of the pressing device in the application.

[0025] Among them, the separation tank body 1, the feeding port 2, the liquid inlet 3, the stirring rod 4, the stirring blade 5, the heat preservation layer 6, the filter screen 7, the first discharge port 8, the first control valve 9, the second discharge port 10, the second control valve 11, the third discharge port 12, the third control valve 13, the water spraying head 14, the first separation chamber 15, the second separation chamber 16, the controller 17, the pressing device 18. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0027] It should be noted that when a system is considered to be "connected" to another system, it can be directly connected to the other system or there can be a middle system. The terms "internal", "top", "upper", "lower", "up", "down" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] As Figure 1 ,Figure 2 In a preferred embodiment, the present application provides a composite paper substrate packaging box resource recycling system, which comprises a pressing device 18 for punching the packaging box; a separation device comprising a separation tank body 1, the top of the separation tank body 1 is provided with a feeding port 2, a filter screen 7 is vertically arranged in the separation tank body 1, the filter screen 7 and one side wall of the separation tank body 1 form a first separation chamber 15, the bottom end of the first separation chamber 15 is provided with a first discharge port 8 for discharging paper pulp, the filter screen 7 and the other side of the separation tank body 1 form a second separation chamber 16, the side wall of the second separation chamber 16 is provided with a second discharge port 10 for discharging plastic film, the bottom of the second separation chamber 16 is provided with a third discharge port 12 for discharging aluminum foil, the first discharge port 8 is provided with a first control valve 9, the second discharge port 10 is provided with a second control valve 11, and the third discharge port 12 is provided with a third control valve 13. The pressing device 18 punches and presses the packaging box, so that the water solution easily penetrates into the interlayer of the packaging box through the holes, fully soaks the packaging box, separates the paper, aluminum foil and plastic film in the packaging box, and then quickly separates them. The packaging box punched and pressed by the pressing device 18 is put into the feeding port 2 at the top of the separation tank body 1, and then the separation and disposal of the packaging box are started. The filter screen 7 is provided with a plurality of holes, the diameter of the holes is 0.5-1.5 mm, for example, the diameter of the holes is 1 mm, the dissolved paper pulp can pass through the holes, enter the first separation chamber 15, and then be discharged through the first discharge port 8 for collection and treatment, while the plastic film and aluminum foil cannot pass through and need to be further separated. In the second separation chamber 16, after the plastic film and aluminum foil are separated, the plastic film floats on the upper layer of the liquid because its density is relatively small, and can be discharged through the second discharge port, and the aluminum foil sinks in the lower layer because its density is relatively large, and can be discharged through the third discharge port, so that the complete separation of the paper, aluminum foil and plastic film is finally completed.

[0030] Further, the second separation chamber 16 is provided with a stirring rod 4, one end of the stirring rod 4 penetrates the top of the separation tank body 1 and is connected with a driving motor, a plurality of stirring blades 5 are arranged on the stirring rod 4, and the stirring blades 5 are distributed equidistantly and staggered. The above technical feature can effectively promote the penetration of the solution into the interlayer of the packaging box, and accelerate the separation of the paper, plastic film and aluminum foil. In the separation process of the plastic film and aluminum foil, the stirring blades 5 can make the plastic film and aluminum foil float and disperse during rotation, so as to prevent part of the plastic film from being adhered to or covered by the aluminum foil.

[0031] Further, the separation tank body 1 is provided with a heat preservation layer 6. The heat preservation layer 6 can keep the temperature of the water or other mixed solution unchanged for a certain period of time, which meets the process requirements. The heat preservation layer 6 can be made of glue powder polystyrene particles, mineral wool or rock wool.

[0032] Furthermore, a water spray head 14 is installed inside the second separation chamber 16, with one end of the spray head 14 connected to a water source. The spray head 14 can rotate 180 degrees and has several spray holes with a conical cross-section. A booster pump is installed between the spray head 14 and the water source. Through these technical features, the pulp residue and plastic film adhering to the filter screen 7 and the separation tank can be washed away, allowing them to be discharged from their respective discharge ports.

[0033] Specifically, a controller 17 is provided on one side of the outer wall of the separation tank 1. The controller 17 is connected to the first control valve 9, the second control valve 11, and the third control valve 13 via signal connections. The controller 17 is equipped with several control buttons, which control the opening and closing of the control valves. The controller 17 can also control the start-up of the booster pump.

[0034] The top of the separation tank 1 is also provided with a liquid inlet 3. For example, the cross-section of the liquid inlet 3 is trapezoidal, so that water or other mixtures can be easily injected into the separation tank 1 through the liquid inlet 3.

[0035] The present invention also provides a method for separating paper, aluminum foil and plastic film using the above system, comprising the following steps;

[0036] S1: In the pressing device, a circular hole with a diameter of 2 to 5 mm is punched in the packaging box;

[0037] S2: The perforated packaging box is put into the separation tank through the feed inlet, and water is injected into the separation tank through the liquid inlet to soak and stir the packaging box;

[0038] S3: After stirring stops, open the first control valve and the spray head to discharge the pulp;

[0039] S4: After the pulp is discharged, close the water spray head and the first control valve, and inject the mixture of water, acetic acid and liquor into the separation tank through the inlet for soaking and stirring;

[0040] S5: After repeating step 3, close the first control valve and the spray head, inject a certain amount of concentrated brine into the separation tank from the inlet, and stir for 2 to 5 minutes to suspend the aluminum foil and plastic film.

[0041] S6: Stop stirring and let it stand for 3-5 minutes. Then open the second control valve to discharge the plastic film floating on the liquid from the second discharge port.

[0042] S7: Close the second control valve and open the third control valve to discharge the aluminum foil from the third outlet.

[0043] Specifically, in the above steps, the packaged boxes after liquid separation are transported to the pressing device for punching and pressing, creating circular holes with a diameter of 2-5 mm, for example, 3 mm. The punched and pressed packaged boxes are then placed into the inlet located at the top of the separation tank, and water is injected into the separation tank through the liquid inlet to soak the boxes. After soaking for several minutes, when the paper, aluminum foil, and plastic film begin to separate, the motor is started to drive the stirring rod to begin stirring, dissolving the paper layers into pulp. After stirring stops, the corresponding buttons for the first control valve and the water spray head on the controller are turned on, opening the first control valve and the water spray head. The pulp is discharged through the first outlet, and simultaneously, water is sprayed from the water spray head to wash away any remaining pulp adhering to the filter screen, stirring rod, stirring blades, and the walls of the separation tank. After the pulp is discharged, due to the adhesive between the paper, aluminum foil, and plastic film, some paper layers are not completely dissolved, and the plastic film and aluminum foil are not completely separated. At this point, close the spray nozzle and the first control valve, and inject the mixture of water, acetic acid, and liquor into the separation tank through the inlet for soaking and stirring. After the paper, aluminum foil, and plastic are completely separated, stop stirring, open the first control valve and the spray nozzle, and discharge the remaining pulp. After the pulp is completely discharged, close the first control valve and the spray nozzle, and inject a certain amount of concentrated brine into the separation tank through the inlet, while stirring for 2-5 minutes. Under the stirring action of the stirring blades, the aluminum foil and plastic film are suspended, causing them to disperse. Stop stirring, and after standing for 3-5 minutes, the plastic film floats on the surface of the concentrated brine, while the aluminum foil sinks to the bottom. Open the second control valve, and discharge the plastic film floating on the liquid through the second outlet. Then open the third control valve, and discharge the aluminum foil through the third discharge port. The discharged pulp, aluminum foil, and plastic film are collected for reprocessing.

[0044] Furthermore, to ensure that the packaging box is completely submerged in water and that the paper, aluminum foil, and plastic film can be separated, the temperature of the water injected into S2 is 60° to 75°, and the mass ratio of the packaging box to water is 1:3.5 to 5.

[0045] When the water temperature is below 55°C, the packaging box does not react during soaking and stirring, failing to achieve the desired stratification. When the water temperature is between 55°C and 60°C, the packaging box shows slight stratification, but the effect is poor, and the paper layer cannot be dissolved. When the water temperature exceeds 60°C, the stratification of the packaging box becomes increasingly apparent, and the paper layer can be dissolved into pulp during stirring. When the water temperature exceeds 75°C, the plastic film layer begins to soften, affecting the separation effect from the paper layer. When the water temperature approaches 100°C, the plastic film becomes flocculent during stirring, and some of the plastic film residue mixes with the pulp, making separation from the pulp more difficult.

[0046] In one embodiment, the ratio of water, acetic acid, and liquor in step S4 is 1:0.5:0.5 to 1:1.5:1.5. During this process, both acetic acid and liquor have a dissolving effect on the adhesives between paper, plastic film, and aluminum foil; using them together yields better results. To achieve even better results, the ratio of acetic acid to liquor is chosen to be 1:1, and then a certain amount of water is added before injecting the mixture into the separation tank for soaking and stirring.

[0047] In another embodiment, the concentration of the brine in S5 is not less than 10%. The density of the aluminum foil in the dairy product packaging box is 2.7–2.8 g / cm³. 3 The main component of the plastic film is polyethylene (PE), with a density of 0.94–0.96 g / cm³. 3 Therefore, adding appropriate salt to water increases the density of the water, which increases the buoyancy of the plastic film, allowing it to float on the surface of the liquid, while the aluminum foil, being denser, will sink to the bottom of the liquid.

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in further detail below.

[0049] Example 1

[0050] Step 1: In the pressing device, punch a round hole with a diameter of 2-5mm into the 20kg packaging box;

[0051] Step 2: Place the perforated packaging box into the separation tank through the feed inlet, and inject water into the separation tank through the liquid inlet to soak and stir the packaging box;

[0052] Step 3: After stirring stops, open the first control valve and the spray head to discharge the pulp;

[0053] Step 4: After the pulp is discharged, close the water spray head and the first control valve, and inject the mixture of water, acetic acid and liquor into the separation tank through the inlet for soaking for 30 minutes and stirring for 15 minutes;

[0054] Step 5: After repeating step 3, close the first control valve and the spray head, inject a certain amount of concentrated brine into the separation tank from the inlet, and stir for 2 to 5 minutes to suspend the aluminum foil and plastic film.

[0055] Step 6: Stop stirring and let it stand for 3-5 minutes. Then, open the second control valve to discharge the plastic film floating on the liquid from the second discharge port.

[0056] Step 7: Close the second control valve and open the third control valve to discharge the aluminum foil from the third outlet;

[0057] Step 8: Evaporate the discharged pulp to remove water, dry the plastic film, peel off the separated aluminum foil and the unseparated paper, plastic film and aluminum foil, and weigh them.

[0058] In this embodiment, before separating the paper, plastic film, and aluminum foil in the packaging box, the packaging box to be separated is weighed and the specific data is recorded. Steps 3 to 7 are repeated using different proportions of water, acetic acid, and liquor for soaking, stirring, discharge, and collection. The discharged pulp is collected and evaporated to obtain pulp powder, which is weighed and the data is recorded. The discharged plastic film is collected, dried, weighed, and the data is recorded. The unseparated paper, plastic film, and aluminum foil, along with the separated aluminum foil, are discharged from the third discharge port and drained of moisture. Then, the separated aluminum foil is peeled off, weighed, and the data is recorded. The weights of the obtained pure paper powder, plastic film, and aluminum foil are added together and compared with the mass before separation to analyze the proportion of separated components.

[0059] Repeat steps 1 through 8, adjusting the ratio of water to acetic acid and liquor, and observe the degree of separation between the aluminum foil, plastic film, and paper.

[0060] Option 1: The ratio of water, acetic acid, and liquor is 1:0.2:0.2, with other conditions remaining unchanged;

[0061] Option 2: The ratio of water, acetic acid, and liquor is 1:0.4:0.4, with other conditions remaining unchanged;

[0062] Option 3: The ratio of water, acetic acid, and liquor is 1:0.5:0.5, with other conditions remaining unchanged;

[0063] Option 4: The ratio of water, acetic acid, and liquor is 1:1:1, with other conditions remaining unchanged;

[0064] Option 5: The ratio of water, acetic acid, and liquor is 1:1.5:1.5, with other conditions remaining unchanged;

[0065] Scheme 6: The ratio of water, acetic acid, and baijiu (Chinese liquor) is 1:1.6:1.6, with other conditions remaining unchanged. The test results are shown in the table below:

[0066]

[0067] The data above shows that when the ratio of water, acetic acid, and liquor was 1:0.2:0.2 and 1:0.4:0.4, approximately 18% and 7% of the paper, plastic film, and aluminum foil, respectively, remained unseparated and were still partially stuck together. Further adjustments to the ratio of water to acetic acid and liquor, resulting in ratios of 1:0.5:0.5, 1:1:1, and 1:1.5:1.5, achieved separation rates of 99.8%, 99.85%, and 99.9%, respectively. During the separation process, some loss of paper, plastic film, and aluminum foil is inevitable. Therefore, the data indicates that when the ratio of water, acetic acid, and liquor was 1:0.5:0.5, the paper, plastic film, and aluminum foil in the packaging box were completely separated. When the ratio was adjusted to 1:1.6:1.6, corrosion occurred on the aluminum foil surface, causing loss and waste. Therefore, a water, acetic acid, and liquor ratio of 1:0.5:0.5 to 1:1.5:1.5 can ensure complete separation of paper, plastic film, and aluminum foil without damage to the plastic film and aluminum foil. For example, when recycling paper, plastic film, and aluminum foil from packaging boxes, choosing a water, acetic acid, and liquor ratio of 1:0.5:0.5 can achieve the desired separation while reducing costs.

[0068] Example 2

[0069] In this second embodiment, the steps are the same as in the first embodiment, repeating steps 5 to 7. For example, after separating the plastic film and aluminum foil obtained by water, acetic acid, and liquor in a ratio of 1:0.5:0.5, they are mixed together. The height of the highest surface of the plastic film and aluminum foil is measured to be 18.5 cm. Salt water of different concentrations is added to the separation tank to make the liquid level reach 100 cm in all cases. The stratification effect of aluminum foil and plastic film in salt water solutions of different concentrations is then tested.

[0070] Option 7: The concentration of saline solution is 2%, and other conditions remain unchanged;

[0071] Option 8: The concentration of the saline solution is 5%, and other conditions remain unchanged;

[0072] Option 9: The concentration of the saline solution is 7%, and other conditions remain unchanged;

[0073] Option 10: The concentration of saline solution is 9%, and other conditions remain unchanged;

[0074] Option 11: The concentration of saline solution is 10%, and other conditions remain unchanged;

[0075] Option 12: The concentration of saline solution is 15%, and other conditions remain unchanged;

[0076] The following table shows the results of the detected floating height (cm) of aluminum foil and plastic film in the salt solution:

[0077]

[0078] The data above shows that as the salt concentration increases, the buoyancy of the plastic film gradually increases, causing it to begin separating from the aluminum foil. In a solution with a surface height of 100 cm: when the salt concentration is 2%, the plastic film begins to separate from the aluminum foil, with the bottom layer of the plastic film suspended at a height of 18.8 cm and the top layer at 30.8 cm; when the salt concentration is 5%, the bottom layer is suspended at a height of 43 cm and the top layer at 54.7 cm; when the salt concentration is 7%, the bottom layer is suspended at a height of 57.6 cm and the top layer at 69.8 cm; when the salt concentration is 9%, the bottom layer is suspended at a height of 75.1 cm and the top layer at 87.4 cm; and when the salt concentration is 10%, the bottom layer is suspended at a height of 88.2 cm and the top layer at 99.8 cm. Clearly, the plastic film has floated on the surface of the salt solution, making it easier to discharge it from the second discharge port. When the salt concentration was 15%, the bottom layer of the plastic film was suspended at a height of 88.4 cm in the salt solution, and the top layer was 99.9 cm, which was almost the same as when the concentration was 10%. Throughout the separation process, the aluminum foil, due to its higher density, remained at the bottom of the salt solution.

[0079] Therefore, it can be seen that when the concentration is less than 10%, the separation effect of aluminum foil and plastic film is generally poor, and it is difficult to separate the plastic film from the aluminum foil. When the brine concentration reaches 10% or above, the plastic film begins to float and approach the surface of the brine. At this time, the effect is good. Brine of the same concentration is continuously added to the separation tank until the plastic film is completely discharged through the second outlet.

[0080] The embodiments described above merely illustrate the device layout of this application. The descriptions are quite specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several adjustments and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be based on the appended claims.

Claims

1. A method for resource recycling of composite paper substrate packaging boxes, characterized in that, This is applied to a resource recycling system for composite paper-based packaging boxes, the system comprising: A pressing device, used for punching holes in packaging boxes; A separation device includes a separation tank with a feed inlet and a liquid inlet at the top. A filter screen is vertically installed inside the separation tank, forming a first separation chamber with one side wall of the tank. A first discharge port for discharging pulp is located at the bottom of the first separation chamber. The filter screen and the other side of the tank form a second separation chamber, with a second discharge port for discharging plastic film on the side wall of the second separation chamber. A third discharge port for discharging aluminum foil is located at the bottom of the second separation chamber. A first control valve is installed on the first discharge port, a second control valve is installed on the second discharge port, and a third control valve is installed on the third discharge port. A water spray head is installed inside the second separation chamber, with one end of the spray head connected to a water source. The method for recycling composite paper substrate packaging boxes includes the following steps: S1: In the pressing device, a circular hole with a diameter of 2~5mm is punched in the packaging box; S2: The perforated packaging box is put into the separation tank through the feed inlet, and water is injected into the separation tank through the liquid inlet to soak and stir the packaging box; S3: After stirring stops, open the first control valve and the spray head to discharge the pulp; S4: After the pulp is discharged, close the water spray head and the first control valve, and inject the mixture of water, acetic acid and liquor into the separation tank through the inlet for soaking and stirring; S5: After repeating step 3, close the first control valve and the spray head, inject a certain amount of concentrated brine into the separation tank from the inlet, and stir for 2-5 minutes to suspend the aluminum foil and plastic film. S6: Stop stirring and let it stand for 3-5 minutes. Then open the second control valve to discharge the plastic film floating on the liquid from the second discharge port. S7: Close the second control valve and open the third control valve to discharge the aluminum foil from the third outlet.

2. The method for resource recycling of composite paper substrate packaging boxes according to claim 1, characterized in that, The temperature of the water injected into S2 is 60℃~75℃, and the mass ratio of the packaging box to the water is 1:3.5~5.

3. The method for resource recycling of composite paper substrate packaging boxes according to claim 1, characterized in that, In S4, the ratio of water, acetic acid, and liquor is 1:0.5:0.5 to 1:1.5:1.

5.

4. The method for resource recycling of composite paper substrate packaging boxes according to claim 1, characterized in that, In S5, the concentration of the concentrated brine is not less than 10%.

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