A residual film sludge separation device and separation method of a multi-channel separation process

Abstract

This invention discloses a multi-stage residual film separation device, comprising a feeding belt, a first separation mechanism, a shredding and separation mechanism, a second separation mechanism, a discharge belt, and a collection tank. The shredding and separation mechanism is equipped with an inlet, an upper discharge outlet, and a lower discharge outlet. The feeding belt and the discharge belt are respectively connected to the inlet and lower discharge outlet of the shredding and separation mechanism. The second separation mechanism is connected to the upper discharge outlet of the shredding and separation mechanism. The first separation mechanism is connected to the feeding belt. A collection tank is provided at the outlets of the first and second separation mechanisms. This invention employs a multi-stage separation method to separate different types of residual film, achieving effective separation of different types of residual film. This avoids both excessive impurities in the separated residual film and excessive residual film in the waste impurities, thus preventing resource waste.

Description

Technical Field

[0001] This invention relates to the field of old plastic film recycling technology, specifically to a multi-stage separation process for residual film residue separation equipment and method. Background Technology

[0002] The plastic film widely used in agricultural production becomes waste plastic film after use. This waste plastic film is difficult to degrade naturally and will accumulate in the soil for a long time, affecting soil structure and crop growth. The residual film pollution not only reduces land productivity, but also causes visual pollution and potential ecological risks to the environment.

[0003] Currently used residual film recycling machines, such as the waste mulch film recycling and regeneration device disclosed in CN118650780B, mainly separate residual film from soil and straw impurities through drum screens and grid conveyors. However, these methods suffer from problems such as mulch film entanglement and clogging, resulting in poor separation efficiency and a high proportion of impurities in the separated residual film. Furthermore, existing separation technologies are ineffective when handling residual film containing a large amount of impurities, leading to the disposal of large quantities of waste mulch film along with impurities, thus limiting resource reuse. Moreover, existing separation technologies cannot effectively separate waste mulch film, resulting in residual film still containing impurities and exhibiting poor quality. This necessitates re-sorting during subsequent recycling, leading to repetitive labor. This invention provides a multi-stage residual film slag separation device and method to solve the above problems. Summary of the Invention

[0004] This invention provides a residual film slag separation device and method with multiple separation processes. It adopts a multi-stage separation method to achieve effective separation of waste plastic film and impurities, ensuring the separation quality of waste plastic film and the efficiency of separation operation.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A multi-stage residual film separation device includes a feeding belt, a first separation mechanism, a shredding separation mechanism, a second separation mechanism, a discharge belt, and a collection tank. The shredding separation mechanism is provided with a feed inlet, an upper discharge outlet, and a lower discharge outlet. The feeding belt and the discharge belt are respectively connected to the feed inlet and the lower discharge outlet of the shredding separation mechanism. The second separation mechanism is connected to the upper discharge outlet of the shredding separation mechanism. The first separation mechanism is connected to the feeding belt. A collection tank is provided at the outlet of the first separation mechanism and the outlet of the second separation mechanism.

[0007] After the residual film enters the feeding belt, it undergoes a first separation through the first separation mechanism, then enters the shredding and separation mechanism for shredding and separation, and undergoes a third separation through the second separation mechanism.

[0008] Furthermore, the shredding and separating mechanism includes a separating chamber, a partition screen, a shredding assembly, and a conveying assembly. The partition screen is horizontally arranged in the separating chamber, dividing the separating chamber into an upper shredding chamber and a lower conveying chamber. The feed inlet and the upper discharge outlet are located on the shredding chamber, and the lower discharge outlet is located on the conveying chamber. The shredding assembly is located in the shredding chamber and is used to shred the residual film to form film fragments and impurities. The conveying assembly is located in the shredding chamber and is used to convey the impurities.

[0009] Furthermore, the second separation mechanism includes a separation cylinder, a separation screen, and a feeding pipe. The separation cylinder is connected to the upper discharge port via a connecting pipe. The separation cylinder is vertically arranged and has an opening at its lower end. The separation screen is located inside the separation cylinder and below the feed inlet of the separation cylinder. The feeding pipe is connected to the top of the separation cylinder. The collection pool is located at the discharge port of the feeding pipe and below the separation cylinder. A fan is installed on the feeding pipe.

[0010] Furthermore, the separating net is inclinedly arranged in the separating cylinder, and a material leakage slit is provided between the bottom end of the separating net and the side wall of the separating cylinder. A power device is provided on the separating net to drive the separating net to vibrate.

[0011] Furthermore, the feeding belt includes a belt conveyor and a separation hood. The separation hood is installed on the belt conveyor to enclose the belt conveyor. The separation hood is provided with a separation port, and the first separation mechanism is connected to the separation port.

[0012] Furthermore, the first separation mechanism includes a separation pipe and a separation fan. The inlet of the separation pipe is connected to the separation port on the separation hood. The separation fan is located on the separation pipe, and the collection tank is located at the outlet of the separation pipe.

[0013] Furthermore, the collection pool includes a first collection pool and a second collection pool. The first collection pool is located at the outlet of the feeding pipe, and the second collection pool is located below the outlet of the first separation mechanism and the separation cylinder. The second collection pool includes a material pool and a separation screen. The separation screen is installed in the material pool and divides the material pool into upper and lower pools.

[0014] Furthermore, the shredding assembly includes a pair of shredding rollers arranged horizontally in the shredding chamber, and the conveying assembly includes a conveying and stirring shaft arranged horizontally in the conveying chamber. Both the shredding rollers and the conveying and stirring shaft are arranged along the entire length in the front-to-back direction.

[0015] Furthermore, the feed inlet is located at the top front end of the shredding chamber, the upper discharge outlet is located at the upper rear end of the shredding chamber, and the lower discharge outlet is located at the bottom rear end of the conveying chamber.

[0016] A separation method for a multi-stage residual film sludge separation device includes the following steps:

[0017] S1, Primary Separation: When the equipment is started, the residual film enters the feeding belt from the feed inlet. As the residual film is conveyed by the feeding belt, the smaller and lighter residual film is separated by the adsorption of the first separation mechanism and conveyed to the second collection tank.

[0018] S2, Shredding and Separation: The residual film after the first separation enters the shredding and separation mechanism, where it is shredded by the shredding component to form film fragments and impurities. The film fragments are conveyed to the second separation mechanism through the upper discharge port, while the impurities pass through the partition screen and enter the conveying chamber. The conveying component then conveys the impurities to the discharge belt through the lower discharge port.

[0019] S3, three-stage separation: The shredded film is conveyed by the shredding assembly to the upper discharge port of the shredding chamber, and enters the second separation mechanism under the swing of the shredding assembly. The lighter shredded film in the second separation mechanism is adsorbed by the feeding pipe and conveyed to the first collection tank through the feeding pipe, while the heavier shredded film falls into the second collection tank through the partition.

[0020] S4, Aggregate Screening: The broken film material entering the second aggregate tank and the residual film from the first separation are screened in the second aggregate tank, and the residual film in the upper tank is collected for recycling.

[0021] The beneficial effects of this invention are as follows:

[0022] By employing a multi-stage separation method, different types of residual membranes are separated multiple times, achieving effective separation of different types of residual membranes. This avoids both the separation of residual membranes containing a large amount of impurities and the waste of resources caused by a large amount of residual membranes in the discarded impurities.

[0023] The residual film is separated by wind using the first and second separation mechanisms, and the residual film is shredded by the shredding separation mechanism to effectively separate the residual film from impurities. The separation of the residual film from impurities is further separated by wind, which effectively improves the separation quality of the residual film and ensures that the impurity content in the separated residual film is low. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the connection state of the first separation mechanism of the present invention;

[0026] Figure 3 This is a schematic diagram of the feeding belt structure of the present invention;

[0027] Figure 4 This is a schematic diagram showing the connection state of the second separation mechanism of the present invention;

[0028] Figure 5This is a schematic diagram of the internal structure of the shredding and separating mechanism of the present invention;

[0029] Figure 6 This is a cross-sectional schematic diagram of the shredding and separating mechanism of the present invention;

[0030] Figure 7 This is a schematic diagram of the second separation mechanism of the present invention;

[0031] Figure 8 This is a schematic diagram of the internal structure of the second separation mechanism of the present invention;

[0032] Figure 9 This is a schematic diagram of the second material collection tank structure of the present invention.

[0033] Reference numerals in the attached drawings: 1. Feeding belt; 11. Belt conveyor; 12. Separation hood; 2. First separation mechanism; 3. Shredding and separation mechanism; 31. Separation bin; 32. Partition screen; 33. Shredding assembly; 34. Conveying assembly; 4. Second separation mechanism; 41. Separation cylinder; 42. Separation screen; 43. Feeding pipe; 5. Discharge belt; 6. Collection pool; 61. Material pool; 62. Separation screen. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] like Figure 1As shown, a multi-stage film separation device includes a feeding belt 1, a first separation mechanism 2, a shredding separation mechanism 3, a second separation mechanism 4, a discharge belt 5, and a collection tank. The shredding separation mechanism 3 is provided with an inlet, an upper discharge outlet, and a lower discharge outlet. The feeding belt 1 and the discharge belt 5 are respectively connected to the inlet and lower discharge outlet of the shredding separation mechanism 3. The feeding belt 1 is used to feed the film and transport it to the shredding separation mechanism 3. The impurities separated in the shredding separation mechanism 3 are output through the discharge belt 5. The second separation mechanism 4 is connected to the upper discharge outlet of the shredding separation mechanism 3 and is used to output the film separated in the shredding separation mechanism 3. The first separation mechanism 2 is connected to the feeding belt 1 and separates the light and non-tangled film before it enters the shredding separation mechanism 3 for the first separation. A collection tank is provided at the outlet of the first separation mechanism 2 and the second separation mechanism 4.

[0037] like Figure 1 As shown, the collected residual film first enters the feeding conveyor belt 1. The residual film undergoes a first separation as it passes through the first separation mechanism 2. At this point, the airflow separation action of the first separation mechanism 2 directly separates the non-clumped, lightweight, and relatively clean residual film, avoiding resource waste caused by repeated processing of such residual film. It also improves the separation efficiency and quality of the remaining residual film entering the shredding and separation mechanism 3. The residual film after the first separation enters the shredding and separation mechanism 3 for further shredding and separation. In the shredding and separation mechanism 3, the clumped residual film is shredded, and impurities in the residual film are separated. The residual film and impurities are separated by a screen 32. The separated residual film, i.e., shredded film, is located in the shredding chamber above the screen 32 and enters the second separation mechanism 4 through the upper discharge port. The separated impurities, i.e., mixed materials, fall through the screen 32 into the conveying chamber and are conveyed to the discharge belt 5 through the lower discharge port. The shredded film in the second separation mechanism 4 undergoes three separations. Lighter residual film in the shredded film is adsorbed by wind and output through the upper feeding pipe 43, while the impurities fall into the collection pool through the opening below the separation cylinder 41 under the action of gravity. Through the above three separations, the separation of residual film and impurities is effectively ensured, which not only avoids the waste of resources caused by a large amount of residual film entangled in the separated impurities, but also effectively reduces the impurity content in the separated residual film. The residual film can be recycled without further processing.

[0038] like Figure 4 , 5As shown in Figure 6, the shredding and separating mechanism 3 further includes a separating chamber 31, a partition 32, a shredding component 33, and a conveying component 34. The partition 32, the shredding component 33, and the conveying component 34 are all disposed in the separating chamber 31. The partition 32 is horizontally disposed in the separating chamber 31, dividing the separating chamber 31 into an upper shredding chamber and a lower conveying chamber. The feed inlet and the upper discharge outlet are disposed on the shredding chamber, and the lower discharge outlet is disposed on the conveying chamber. The shredding component 33 is disposed in the shredding chamber and is used to shred the residual film to form film fragments and impurities. The conveying component 34 is disposed in the shredding chamber and is used to convey the impurities.

[0039] The shredding chamber is used to shred the input tangled residual film. Due to the obstruction of the partition 32, larger residual films cannot pass through the partition 32 and remain in the shredding chamber, becoming shredded film. It is then driven by the shredding component 33 and conveyed to the upper discharge port. At the upper discharge port, it is thrown out by the shredding component 33 into the second separation mechanism 4. Meanwhile, the impurities tangled in the residual film are also broken into small pieces by the shredding component 33 and fall into the lower conveying chamber through the partition 32, becoming mixed material. The mixed material is driven by the conveying component 34 and conveyed to the lower discharge port, and then conveyed to the discharge belt 5 at the lower discharge port.

[0040] like Figure 4 , 7 As shown in Figure 8, the second separation mechanism 4 further includes a separation cylinder 41, a separation net 42, and a feeding pipe 43. The separation cylinder 41 is connected to the upper discharge port through a connecting pipe. The separation cylinder 41 is vertically arranged and its lower end is open. The separation net 42 is disposed in the separation cylinder 41 and located below the feed inlet of the separation cylinder 41. The feeding pipe 43 is connected to the top of the separation cylinder 41. The collection pool is disposed at the discharge port of the feeding pipe 43 and below the separation cylinder 41. A fan is provided on the feeding pipe 43.

[0041] In the shredding chamber, the shredded film material is thrown out by the shredding component 33 at the upper discharge port into the separation cylinder 41. Due to incomplete impurity separation, impurities are still mixed in with the shredded film material. These impurities are entangled with or mixed in with the residual film. Conventional separation equipment cannot separate such impurities and will directly convey them to the next process, resulting in repeated processing when recycling the residual film, which leads to the problem of repetitive labor. In this invention, the shredded film material entering the separation cylinder 41, the light residual film is directly adsorbed by wind into the feeding pipe 43 and separated, while the residual film or impurities mixed in fall onto the separation screen 42. On the separation screen 42, the impurities are separated from the residual film by vibration. The impurities pass through the separation screen 42 and fall into the collection pool below, while the residual film is adsorbed by wind into the feeding pipe 43.

[0042] like Figure 8As shown, the separating net 42 is further inclinedly arranged in the separating cylinder 41, and a material leakage slit is provided between the bottom end of the separating net 42 and the side wall of the separating cylinder 41. Straw or long impurities fall into the collection pool below through the material leakage slit. A power device is provided on the separating net 42 to drive the separating net 42 to vibrate.

[0043] like Figure 2 , 3 As shown, the feeding belt 1 further includes a belt conveyor 11 and a separation hood 12. The separation hood 12 is installed on the belt conveyor 11, enclosing the belt conveyor 11 to form a separation chamber. The separation hood 12 is provided with a separation port. The first separation mechanism 2 is connected to the separation port. The suction force generated by the fan of the first separation mechanism 2 directly separates the untangled, lightweight and relatively clean residual film from the residual film, eliminating the need for further processing in the shredding and separation mechanism 3. Pre-separation not only improves the separation efficiency of the residual film, but also improves the separation quality of the relatively clean residual film by pre-separating and processing it, reducing the impurity rate in the residual film. It also avoids the waste of resources caused by the loss of relatively clean residual film after it is shredded again.

[0044] like Figure 2 As shown, the first separation mechanism 2 further includes a separation pipe and a separation fan. The inlet of the separation pipe is connected to the separation port on the separation hood 12. The separation fan is installed on the separation pipe. The residual film is sucked into the separation pipe from the separation port on the separation hood 12 by the wind force generated by the separation fan. The collection pool is installed at the outlet of the separation pipe.

[0045] like Figure 1 , 9 As shown, the collection pool further includes a first collection pool and a second collection pool. The first collection pool is located at the outlet of the feeding pipe 43. The residual film after three separations is relatively clean and can be directly recycled and reused. The second collection pool is located below the outlet of the first separation mechanism 2 and the separation cylinder 41. There are some impurities in the two outlets, which need to be separated and collected. The second collection pool includes a material pool 61 and a separation screen 62. The separation screen 62 is set in the material pool 61, dividing the material pool 61 into upper and lower pools. After the impurities fall into the second collection pool, the residual film will stay above the separation screen 62 and be conveyed out of the collection pool for recycling and reuse. The impurities are collected after passing through the separation screen 62.

[0046] Furthermore, the separating screen 62 is connected to a power mechanism, which drives the separating screen 62 to move, conveying the residual film falling on it out of the collection pool for unified collection.

[0047] like Figure 5 , 6As shown, the shredding assembly 33 further includes a pair of shredding rollers arranged horizontally in the shredding chamber, with the two shredding rollers rotating in opposite directions. The conveying assembly 34 includes a conveying and stirring shaft arranged horizontally in the conveying chamber. Both the shredding rollers and the conveying and stirring shaft are arranged along the entire length in the front-to-back direction.

[0048] Furthermore, the feed inlet is located at the top front end of the shredding chamber, the upper discharge outlet is located at the upper rear end of the shredding chamber, and the lower discharge outlet is located at the bottom rear end of the conveying chamber.

[0049] Furthermore, the partition net 32 ​​adopts a modular structure and can be detachably installed in the separation chamber 31 through assembly installation.

[0050] Furthermore, the first separation mechanism 2 and the second separation mechanism 4 are symmetrically arranged on both sides of the shredding and separation mechanism 3.

[0051] A separation method for a multi-stage residual film sludge separation device includes the following steps:

[0052] S1, Primary separation: Start the equipment. The residual film enters the feeding belt 1 from the feed port. When the residual film is conveyed by the feeding belt 1, the smaller and lighter residual film is separated by the adsorption of the first separation mechanism 2 and conveyed to the second collection tank.

[0053] S2, Shredding and Separation: The residual film after the first separation enters the shredding and separation mechanism 3, and is shredded by the shredding component 33 to form film fragments and impurities. The film fragments are conveyed to the second separation mechanism 4 through the upper discharge port, and the impurities enter the conveying chamber through the partition 32. The conveying component 34 conveys the impurities to the discharge belt 5 through the lower discharge port.

[0054] S3, three-stage separation: The shredded film is conveyed by the shredding component 33 to the upper discharge port of the shredding chamber, and enters the second separation mechanism 4 under the swing of the shredding component 33. The lighter shredded film in the second separation mechanism 4 is adsorbed by the feeding pipe 43 and conveyed to the first collection pool through the feeding pipe 43, while the heavier shredded film falls into the second collection pool through the partition net 32.

[0055] S4, Aggregate Screening: The broken film material entering the second aggregate tank and the residual film from the first separation are screened in the second aggregate tank, and the residual film in the upper tank is collected for recycling.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A residual membrane residue separation device with multiple separation processes, characterized in that: The system includes a feeding belt (1), a first separation mechanism (2), a shredding and separation mechanism (3), a second separation mechanism (4), a discharge belt (5), and a collection tank (6). The shredding and separation mechanism (3) is provided with a feed inlet, an upper discharge outlet, and a lower discharge outlet. The feeding belt (1) and the discharge belt (5) are respectively connected to the feed inlet and the lower discharge outlet of the shredding and separation mechanism (3). The second separation mechanism (4) is connected to the upper discharge outlet of the shredding and separation mechanism (3). The first separation mechanism (2) is connected to the feeding belt (1). The collection tank (6) is provided at the outlet of the first separation mechanism (2) and the second separation mechanism (4). After the residual film enters the feeding belt (1), it is separated once by the first separation mechanism (2), then enters the shredding and separation mechanism (3) for shredding and separation, and is separated three times by the second separation mechanism (4); The feeding belt (1) includes a belt conveyor (11) and a separation cover (12). The separation cover (12) is installed on the belt conveyor (11) to close the belt conveyor (11). The separation cover (12) is provided with a separation port, and the first separation mechanism (2) is connected to the separation port. The first separation mechanism (2) includes a separation pipe and a separation fan. The inlet of the separation pipe is connected to the separation port on the separation hood (12). The separation fan is installed on the separation pipe. The collection tank (6) is installed at the outlet of the separation pipe. The second separation mechanism (4) includes a separation cylinder (41), a separation net (42), and a feeding pipe (43). The separation cylinder (41) is connected to the upper discharge port through a connecting pipe. The separation cylinder (41) is vertically arranged and its lower end is open. The separation net (42) is located in the separation cylinder (41) and below the feed inlet of the separation cylinder (41). The feeding pipe (43) is connected to the top of the separation cylinder (41). The collection pool (6) is located at the discharge port of the feeding pipe (43) and below the separation cylinder (41). A fan is provided on the feeding pipe (43).

2. The residual membrane residue separation equipment with multiple separation processes according to claim 1, characterized in that: The shredding and separating mechanism (3) includes a separation chamber (31), a partition net (32), a shredding component (33), and a conveying component (34). The partition net (32) is horizontally arranged in the separation chamber (31), dividing the separation chamber (31) into an upper shredding chamber and a lower conveying chamber. The feed inlet and the upper discharge outlet are located on the shredding chamber, and the lower discharge outlet is located on the conveying chamber. The shredding component (33) is located in the shredding chamber and is used to shred the residual film to form film fragments and impurities. The conveying component (34) is located in the shredding chamber and is used to convey the impurities.

3. The residual membrane residue separation equipment with multiple separation processes according to claim 1, characterized in that: The separation net (42) is inclinedly arranged in the separation cylinder (41). There is a material leakage gap between the bottom end of the separation net (42) and the side wall of the separation cylinder (41). A power device is provided on the separation net (42) to drive the separation net (42) to vibrate.

4. The residual membrane residue separation equipment with multiple separation processes according to claim 1, characterized in that: The collection pool (6) includes a first collection pool and a second collection pool. The first collection pool is located at the outlet of the feeding pipe (43), and the second collection pool is located below the outlet of the first separation mechanism (2) and the separation cylinder (41). The second collection pool includes a material pool (61) and a separation screen (62). The separation screen (62) is located in the material pool (61) and divides the material pool (61) into upper and lower pools.

5. The residual membrane residue separation equipment with multiple separation processes according to claim 2, characterized in that: The shredding assembly (33) includes a pair of shredding rollers arranged horizontally in the shredding chamber. The conveying assembly (34) includes a conveying and stirring shaft arranged horizontally in the conveying chamber. Both the shredding rollers and the conveying and stirring shaft are arranged along the entire length in the front-to-back direction.

6. The residual film slag separation equipment with multiple separation processes according to claim 2, characterized in that: The feed inlet is located at the top front end of the shredding chamber, the upper discharge outlet is located at the upper rear end of the shredding chamber, and the lower discharge outlet is located at the bottom rear end of the conveying chamber.

7. The separation method of a residual film slag separation device with multiple separation processes according to claim 2, characterized in that, Includes the following steps: S1, First separation: Start the equipment, the residual film enters the feeding belt (1) from the feed port of the feeding belt (1). When the residual film is conveyed by the feeding belt (1), the smaller and lighter residual film in the residual film is separated by the adsorption of the first separation mechanism (2) and conveyed to the second collection tank. S2, Shredding and Separation: The residual film after the first separation enters the shredding and separation mechanism (3), and is shredded by the shredding component (33) to form film fragments and impurities. The film fragments are conveyed to the second separation mechanism (4) through the upper discharge port, and the impurities enter the conveying chamber through the partition net (32). The conveying component (34) conveys the impurities to the discharge belt (5) through the lower discharge port. S3, three-stage separation: The shredded film is conveyed by the shredding assembly (33) to the upper discharge port of the shredding chamber, and enters the second separation mechanism (4) under the swing of the shredding assembly (33). The lighter shredded film in the second separation mechanism (4) is adsorbed by the feeding pipe (43) and conveyed to the first collection tank (6) through the feeding pipe (43), while the heavier shredded film passes through the partition net (32) and falls into the second collection tank. S4, aggregate screening: The broken film material entering the second aggregate tank (6) and the residual film separated in the first separation are screened in the second aggregate tank (6), and the residual film in the upper tank is collected for recycling.

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