Method for providing resource-circulation value-chain solution for polyester film, waste treatment apparatus for performing same, and resource circulation processing system including same

Abstract

A resource circulation processing system according to one embodiment comprises: a waste treatment apparatus configured to support a resource circulation value chain for producing a resource circulation product through recycling treatment of a waste polyester film; a product manufacturing apparatus for manufacturing a resource circulation product using a chemically recycled raw material provided from the waste treatment apparatus; and a waste collection apparatus for collecting waste of at least a portion of the resource circulation product and providing the collected waste to the waste treatment apparatus, wherein the waste treatment apparatus, the product manufacturing apparatus, and the waste collection apparatus support a closed loop in which a polyester film is converted into the resource circulation product via the chemically recycled raw material, and at least a portion of the resource circulation product converted from the polyester film is collected and provided, as a waste polyester film, to a waste classification process.

Description

Method for providing a polyester film resource circulation value chain solution, a waste treatment device for performing the method, and a resource circulation treatment system including the same.

[0001] The present invention relates to a method for providing solutions for a resource recycling value chain for polyester film, a waste treatment device for performing the method, and a system for performing treatment for resource recycling including the waste treatment device.

[0002] Classical methods for disposing of waste plastics involved landfilling or incineration, which resulted in problems such as environmental pollution and the emission of toxic gases. Therefore, the recycling of waste plastics is a critical research task.

[0003] Polyester is one of the most widely used plastics, and polyester films are used in various technical fields such as magnetic recording media, electronic components, process films, packaging materials, and industrial materials. These polyester films are distributed in various processed forms depending on the manufacturing method during productization; however, since the ease of collection and sorting varies depending on the processing and distribution forms, the recycling rates also differ.

[0004] Meanwhile, the success or failure of a resource circulation processing system, which encompasses the classification, pretreatment, crushing, materialization, productization, and collection of various recycled materials such as waste polyester film, can be said to depend on optimizing carbon emissions and costs over the entire lifecycle of the product through the tracking of resource circulation raw materials.

[0005] (Prior Art Literature)

[0006] (Patent Document) Republic of Korea Published Patent Application No. 10-2024-0013120, Date of Publication January 30, 2024, Method for manufacturing recycled film

[0007] The embodiments of the present invention aim to provide a polyester film resource circulation value chain solution that optimizes carbon emissions and costs over the entire life cycle of a product by optimizing for a closed-loop in which a resource circulation product is produced identically or similarly to the original waste through recycling treatment and at least a portion of the resource circulation product is recirculated as waste for recycling treatment, and by performing classification and recycling treatment on waste polyester film. Additionally, the invention aims to provide a waste treatment device for performing this method and a resource circulation treatment system including the same.

[0008] The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0009] A method for providing a solution performed by a waste treatment device capable of supporting a resource circulation value chain for producing resource circulation products through recycling treatment of waste polyester film according to the first aspect of the present invention comprises: a step of classifying a closed-loop target with respect to the waste polyester film; and a step of providing at least a portion of the waste polyester film classified as a closed-loop target as a chemical recycling raw material to be fed into a production process of the resource circulation product through the recycling treatment; wherein the closed-loop target is used to produce the resource circulation product identical or similar to the original waste through the recycling treatment, and at least a portion of the resource circulation product is recycled as waste for the recycling treatment.

[0010] A waste treatment device according to a second aspect of the present invention comprises: a memory unit in which an application program including instructions is stored; a processor unit that performs a method of providing a solution capable of supporting a resource circulation value chain that produces a resource circulation product through recycling treatment of waste polyester film by executing the instructions and loading the application program; a waste classification unit that classifies objects for a closed loop in which, under the control of the processor unit, at least a portion of the resource circulation product is recirculated as waste for recycling treatment by producing the resource circulation product identical or similar to the original waste through the recycling treatment of the waste polyester film; and a recycling treatment unit that, under the control of the processor unit, provides at least a portion of the waste polyester film classified as objects for the closed loop as a chemical recycling raw material for input into the production process of the resource circulation product through the recycling treatment.

[0011] A computer-readable recording medium storing a computer program according to a third aspect of the present invention includes instructions for the processor to perform the method of providing a polyester film resource recycling value chain solution by executing the computer program by the processor.

[0012] A computer program stored in a computer-readable recording medium according to the fourth aspect of the present invention includes instructions for the processor to perform the method of providing a polyester film resource recycling value chain solution by executing the computer program by the processor.

[0013] A resource recycling treatment system according to the fifth aspect of the present invention comprises: a waste treatment device; a product production device that produces a resource recycling product using the chemically recycled raw material provided from the waste treatment device; and a waste collection device that collects at least a portion of the waste among the resource recycling products and provides it to the waste treatment device; wherein the waste treatment device, the product production device, and the waste collection device support a closed loop in which a polyester film is transformed into a resource recycling product through the chemically recycled raw material, and at least a portion of the transformed resource recycling product is collected and provided to the waste classification as waste polyester film.

[0014] According to embodiments of the present invention, sorting and recycling treatment of waste polyester film can be performed by optimizing for a closed loop in which a resource-circulating product is produced identically or similarly to the original waste through recycling treatment, and at least a portion of the resource-circulating product is recirculated as waste for recycling treatment.

[0015] According to embodiments of the present invention, by generating, updating, and distributing digital proof information including information about the waste and resource circulation tracking information in correspondence with the waste, it is possible to facilitate the tracking of information about the waste and improve the ease and accuracy of waste classification. As a result, carbon emissions and costs can be optimized over the entire lifecycle of the product, and the total cost of resource circulation processing can be reduced through the reduction of production costs for resource circulation products.

[0016] According to embodiments of the present invention, high-purity polyester raw materials can be recovered and obtained at low cost and high efficiency without degradation of the physical properties of the polyester through a recycling process including a pretreatment that efficiently removes impurities and heterogeneous components from waste polyester film without causing damage or defects to the polyester raw materials. In addition, the obtained polyester raw materials can be easily reused in a process for manufacturing new polyester.

[0017] According to embodiments of the present invention, the pretreatment aqueous solution used in the recycling process and the heterogeneous components recovered from the recycling process can be purified and converted into energy and reused in subsequent recycling processes. Accordingly, the cost and energy consumption of the recycling process are reduced, and a more environmentally friendly recycling process can be provided.

[0018] FIG. 1 is a conceptual diagram illustrating a closed-loop resource circulation structure supported by a resource circulation processing system according to one embodiment of the present invention.

[0019] FIG. 2 is a configuration diagram of a resource recycling treatment system according to one embodiment of the present invention.

[0020] FIG. 3 is a configuration diagram of a waste treatment device constituting a resource circulation treatment system according to one embodiment of the present invention.

[0021] FIG. 4 is a flowchart illustrating a method for providing a resource circulation value chain solution performed by the waste treatment device illustrated in FIG. 3 to support a closed-loop resource circulation structure.

[0022] Figure 5 is an example diagram showing the detailed configuration of the recycling processing unit constituting the waste treatment device illustrated in Figure 3.

[0023] FIG. 6 is a schematic process flow diagram of a recycling process for waste polyester film according to exemplary embodiments.

[0024] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0025] The terms used in this specification will be briefly explained, and the invention will be described in detail.

[0026] The terms used in this invention have been selected based on currently widely used general terms, taking into account their functions within the invention; however, these terms may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the relevant description of the invention. Therefore, the terms used in this invention should be defined not merely by their names, but based on their meanings and the overall content of the invention.

[0027] When a part of a specification is described as 'comprising' a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0028] Additionally, the term "part" as used in the specification refers to software or hardware components, such as FPGAs or ASICs, and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run on one or more processors. Thus, by example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts."

[0029] In this specification, the description that one component is formed above or below another component, or is connected or coupled to one another, includes both direct formation, connection, or coupling between these components and indirect formation, connection, or coupling through the interposition of another component. Furthermore, it should be understood that the criteria for the "above" and "below" of each component may vary depending on the direction in which the object is observed.

[0030] All numerical ranges representing the amounts, reaction conditions, physical property values, dimensions, etc. of the components described in this specification should be understood to be modified by the term "approximately" in all cases unless otherwise specified.

[0031] In numerical ranges defining the size, physical properties, etc., of components described in this specification, if a numerical range in which only the upper limit is defined and a numerical range in which only the lower limit is defined are separately exemplified, it should be understood that a numerical range combining these upper and lower limits is also included in the exemplary range.

[0032] As used in this specification, the term "heterogeneous component" may refer to the components contained in the waste polyester film excluding polyester.

[0033] In this specification, when it is stated that certain processes are performed continuously, this means that the flow of raw materials between said processes continues without interruption, and other processes or steps may be further included between said processes as long as the flow of raw materials is not interrupted.

[0034] Below, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. Additionally, parts of the drawings that are irrelevant to the description are omitted to clearly explain the invention.

[0035] FIG. 1 is a conceptual diagram illustrating a closed-loop resource circulation structure supported by a resource circulation processing system according to one embodiment of the present invention.

[0036] Referring to Fig. 1, a closed-loop resource circulation structure refers to a structure in which resources are circulated in the order of waste collection, waste classification and pretreatment, production of materials using pretreated waste, consumption and disposal during the production process of products using materials, and waste collection after product use. The closed-loop resource circulation structure produces resource circulation products identical or similar to the original waste through recycling treatment, so that at least a portion of the resource circulation products are recirculated as waste for recycling treatment. Although the implementation of a closed-loop resource circulation structure has constraints such as the waste being industrial waste and post-industrial waste (PIR) generated during the manufacturing process, it has the advantages of reducing costs for waste collection, waste classification, and pretreatment, and producing high-quality resource circulation products.

[0037] FIG. 2 is a configuration diagram of a resource circulation processing system according to one embodiment of the present invention, FIG. 3 is a configuration diagram of a waste treatment device constituting a resource circulation processing system according to one embodiment of the present invention, and FIG. 4 is a flowchart for explaining a method of providing a resource circulation value chain solution performed by the waste treatment device shown in FIG. 3 to support a closed-loop resource circulation structure.

[0038] Referring to FIGS. 2 to 4, a resource recycling treatment system (200) according to one embodiment includes a waste collection device (210), a waste treatment device (220), and a product production device (230).

[0039] The waste collection device (210) collects at least some of the waste from resource recycling products and provides it to the waste treatment device (220). For example, the waste collection device (210) may collect used waste polyester film distributed in various processing forms and provide it to the waste treatment device (220). For example, the waste collection device (210) may include hardware components capable of collecting and transporting waste, such as waste polyester film, which can be referred to as used resource recycling products. Alternatively, the waste collection device (210) may be implemented separately from the hardware components and may be interconnected with each other. In this case, the waste collection device (210) may control the waste collection and transportation process by the hardware components and may be connected to communicate with the waste treatment device (220) and the product production device (230) to support a closed loop.

[0040] The waste treatment device (220) can provide a solution for a resource circulation value chain that produces resource circulation products through the recycling treatment of waste such as waste polyester film.

[0041] The waste treatment device (220) classifies the waste polyester film into a closed-loop object through recycling treatment to produce a resource-circulating product identical or similar to the original waste, and at least some of the resource-circulating products are recycled as waste for recycling treatment (S410).

[0042] And, the waste treatment device (220) provides at least a portion of the waste polyester film classified as a closed-loop object as a chemical recycling raw material to be fed into the production process of a resource-circulating product through recycling treatment (S420).

[0043] The waste treatment device (220) includes a memory unit (311), a processor unit (312), a waste classification unit (314), and a recycling processing unit (315), and may further include an input / output unit (313), etc. The waste treatment device (220) will be described again below.

[0044] The product manufacturing device (230) produces a resource-recycling product using chemically recycled raw materials provided from the waste treatment device (220). For example, the product manufacturing device (230) may include hardware components that produce the resource-recycling product identical or similar to the original waste. Alternatively, the product manufacturing device (230) may be implemented separately from the hardware components that produce the resource-recycling product and may be interconnected with each other. In this case, the product manufacturing device (230) may control the resource-recycling product production process by the hardware components that produce the resource-recycling product, and may be communicably connected to the waste treatment device (220) and the waste collection device (210) to support a closed loop.

[0045] The waste collection device (210), waste treatment device (220), and product production device (230) constituting the resource circulation treatment system (200) support a closed loop in which waste is transformed into a resource circulation product through chemical recycling raw materials, and at least some of the transformed resource circulation products are collected and provided to the waste treatment device (220) as waste.

[0046] An application program containing instructions is stored in the memory unit (311) of the waste treatment device (220). For example, the memory unit (311) may store a computer program capable of performing a method for providing a solution for a resource circulation value chain for a closed-loop resource circulation structure when instructions are executed by the processor unit (312).

[0047] The processor unit (312) of the waste treatment device (220) executes a command stored in the memory unit (311), thereby loading an application program containing the command and performing a method of providing a solution that can support a resource circulation value chain that produces resource circulation products through recycling treatment of waste.

[0048] The processor unit (312) controls the waste classification unit (314) to classify objects for a closed loop in which, with respect to waste, resource circulation products are produced identically or similarly to the original waste through recycling treatment, and at least some of the resource circulation products are recirculated as waste for recycling treatment. For example, the processor unit (312) can obtain information about the waste and resource circulation tracking information from digital proof information corresponding to the waste, and can classify objects for a closed loop or classify them as resource circulation materials based on the information obtained from the digital proof information. Here, the information included in the digital proof information can be guaranteed transparency, prevention of tampering, and traceability by utilizing a distributed ledger through blockchain technology. Such a distributed ledger operates by distributing and storing the same data among multiple nodes participating in the network and jointly verifying the creation and update history of the information, thereby improving security and reliability compared to a centralized system. Additionally, digital proof information may be generated or updated by the processor unit (312) of the waste treatment device (220), or by another device involved in the resource circulation value chain, such as a computer device mounted on or linked to the waste collection device (210), or a computer device mounted on or linked to the product production device (230).

[0049] And, the processor unit (312) controls the recycling processing unit (315) to process at least some of the classified closed-loop objects into chemically recycled raw materials for input into the production process of resource recycling products.

[0050] The waste classification unit (314) of the waste treatment device (220) may be a hardware component capable of identifying various types of waste under the control of the processor unit (312) and classifying and processing the various types of waste according to the classification determined by the processor unit (312). Since this waste classification unit (314) is a known technical concept used in waste classification processes for conventional resource recycling, a detailed description will be omitted.

[0051] The recycling processing unit (315) of the waste treatment device (220) provides at least a portion of the waste polyester film classified as a closed-loop target by the waste classification unit (314) as a chemical recycling raw material to be fed into the production process of a resource recycling product through recycling processing. The detailed configuration of the recycling processing unit (315), which performs recycling processing on the waste polyester film under the control of the processor unit (312), will be explained again below.

[0052] The input / output unit (313) of the waste treatment device (220) can receive data necessary for various processing of the processor unit (312) or output various processing results by the processor unit (312). For example, the input / output unit (313) may include at least one of an interface capable of inputting and outputting various data, an input device capable of inputting various commands by a user, a display or printer capable of outputting various processing results so that they can be visually recognized through a screen or printed material, and a communication module capable of transmitting and receiving various data through a communication channel.

[0053] FIG. 5 is an exemplary diagram showing the detailed configuration of a recycling processing unit (315) constituting the waste treatment device (220) illustrated in FIG. 3. However, FIG. 5 is merely for illustrating exemplary embodiments and the scope of the invention is not limited to the contents illustrated therein.

[0054] As previously mentioned, the recycling processing unit (315) constituting the waste treatment device (220) performs recycling treatment on waste polyester film under the control of the processor unit (312). According to the recycling treatment process by this recycling processing unit (315), a method for recycling waste plastic film, specifically waste polyester film, using a pretreatment aqueous solution is provided. For example, the recycling treatment process may include a pretreatment process for the waste polyester film, and the pretreatment process may cause a certain change in physical properties, chemical reaction, surface modification, etc., on the surface of the waste plastic film.

[0055] The above waste polyester film can be obtained from polyester material products that are discarded after use. For example, the waste polyester film may be obtained from waste materials such as beverage bottles, fabrics, films, cases, boxes, partitions, shelves, protective panels, packaging, building materials, interior and exterior materials, electronic components, optical media, etc., made of various polyester materials (e.g., polyethylene terephthalate (PET) materials) that are discarded by users after use.

[0056] According to embodiments of the present invention, a recycling method for waste polyester film may include: a first washing step of frictionally washing the waste polyester film with water to form a first washed product; a chemical washing step of washing the first washed product with an alkaline pretreatment aqueous solution to form a chemical washed product; a second washing step of immersing the chemical washed product in water to form a second washed product; and a recovery step of recovering polyester components from the second washed product.

[0057] For example, the waste polyester film may include a substrate layer and at least one functional layer formed on the substrate layer. The functional layer may be formed by laminating two or more layers on the substrate layer. Depending on the intended use of the waste polyester film, the functional layer may include an adhesive layer, a hard coating layer, a release layer, a UV blocking layer, a polarizing layer, etc.

[0058] The above functional layer may include various resin components depending on the application. For example, the above functional layer may include heterogeneous components such as acrylic adhesives and silicone adhesives.

[0059] If waste polyester film with the functional layer not removed is melted or decomposed and fed as a raw material, filter clogging or depolymerization performance may occur due to substances contained in the functional layer, and the purity and yield of monomers, oligomers, etc. obtained from the waste polyester film may decrease. In this case, the mechanical properties, thermal and chemical stability of the polyester reused from the raw material may deteriorate, and discoloration or contamination with foreign substances may occur.

[0060] According to the present invention, polyester components can be recovered by separating and removing impurities, insoluble matter, heterogeneous components, etc. from waste polyester film, and the purity and yield of the recycled raw material obtained therefrom can be increased.

[0061] In Fig. 5, the path indicated by the solid arrow represents the path through which the polyester component intended for recovery moves.

[0062] Referring to FIG. 5, prior to the first washing step, a crushing step may be further performed to crush the waste polyester film (waste) through a crusher (10).

[0063] Wet grinding or dry grinding may be used as a method for grinding waste polyester film. Waste polyester film can be ground to form a crushed material in the form of flakes having a predetermined size.

[0064] According to some embodiments, the grinding step may be performed under wet conditions, for example, a wet crusher may be used as the grinder (10). A known device may be used as the wet crusher, for example, a grind mill, a ball mill, a rod mill, a rolling mill, a rotate mill, a bead mill, a turbo mill, etc.

[0065] In the case of wet grinding, since heat generation and friction are controlled by water, damage to the polyester component and the occurrence of defects caused by high temperature or frictional force can be suppressed compared to when other grinding methods such as dry grinding are used, and the phenomenon of the ground material adhering to the inner wall or blade of the grinder (10) due to high temperature can be prevented, thereby further increasing process efficiency and the lifespan of the device. In addition, during the wet grinding process, at least some of the impurities and heterogeneous components contained in the waste polyester film can be dissolved in water or react with water to be removed.

[0066] In some embodiments, the size of the ground material may be 50 mm or less, specifically 1 mm to 50 mm. Within this range, a sufficient reaction surface area and impregnation rate can be secured in the washing and chemical cleaning steps performed after the grinding step, thereby allowing impurities to be easily removed to obtain high-purity and high-quality polyester. Additionally, since the size of the ground material is 1 mm or more, damage to the polyester component caused by the severe grinding process can be prevented. The average size of the ground material may be 1 mm to 40 mm, 1 mm to 35 mm, 3 mm to 35 mm, 3 mm to 30 mm, 5 mm to 30 mm, or 5 mm to 25 mm.

[0067] In some embodiments, the thickness of the pulverized material may be 0.5 mm or less. Specifically, the thickness of the pulverized material may be 0.5 mm or less, 0.3 mm or less, 0.2 mm or less, and preferably 0.1 mm or less. For example, the thickness of the pulverized material may be greater than 0 mm and 0.1 mm or less. In one embodiment, the thickness of the pulverized material may be 0.1 mm to 0.5 mm. The thickness of the pulverized material may be the length of the shortest diameter of the pulverized particles.

[0068] The raw materials crushed in the crusher (10) can be filtered to obtain a crushed material. In one embodiment, the crusher (10) may be equipped with a filter mesh at the discharge end, and the filter mesh may be a mesh of 50 mm, 40 mm, 35 mm, 30 mm, or 25 mm.

[0069] In the grinding step above, the grinding time may be 5 minutes or less. For example, the grinding time may be less than 5 minutes, 4.5 minutes or less, or 4 minutes or less, or greater than 0 minutes, 0.5 minutes or more, or 1 minute or more. Specifically, in the grinding step above, the raw materials may be ground for greater than 0 minutes and 5 minutes or less, greater than 0 minutes and less than 5 minutes, 0.5 minutes or more and less than 5 minutes, 0.5 minutes to 4.5 minutes, or 1 minute to 4 minutes.

[0070] In the grinding step above, the grinding temperature may be 30 ℃ or lower. For example, the grinding temperature may be 30 ℃ or lower, less than 30 ℃, or 25 ℃ or lower, or 5 ℃ or higher, 10 ℃ or higher, or 15 ℃ or higher. Specifically, the grinding step may be 5 ℃ to 30 ℃, 5 ℃ or higher and less than 30 ℃, 10 ℃ or higher and less than 30 ℃, or 15 ℃ to 25 ℃.

[0071] Damage to the polyester during the grinding step can be minimized within the above grinding time and temperature range.

[0072] In some embodiments, in the crushing step, the feed rate of the waste polyester film to the crusher (10) may be 10 kg / min or more, 15 kg / min or more, or 20 kg / min or more, and 50 kg / min or less, 45 kg / min or less, 40 kg / min or less, or 30 kg / min or less. For example, the feed rate of the waste polyester film to the crusher (10) may be about 25 kg / min. Within this range, the efficiency of the pretreatment process may be further improved, and the yield and purity of the recycled component may be further enhanced. However, the feed rate of the waste polyester film is not limited thereto and may be appropriately selected by considering the type and number of equipment used in the process, the movement path of the raw material, the type and amount of the raw material being transported, the processing and capacity of the raw material, and the production volume of the recycled component.

[0073] In some embodiments, a cutting process for cutting the waste polyester film into a predetermined size may be further performed prior to the crushing step. The waste polyester film may have various shapes depending on its intended use or application; for example, waste polyester films having different shapes may be collected and recovered from containers such as PET bottles, packaging materials, molded parts for transportation means such as automobiles, or electronic devices and components such as PCs and portable communication devices, optical recording media, etc. By cutting the recovered waste polyester film into a uniform size through the cutting process, the crushing efficiency and cleaning efficiency can be further improved, and each layer of the laminated film can be partially peeled off by high shear and easily separated during the cleaning process.

[0074] The above cutting process can be performed using known cutting machines such as hammer crushers, impact crushers, hydraulic cutters, and rotary crushers. Specifically, the above cutting process can be performed using a hydraulic cutter.

[0075] Through the above cutting process, waste polyester film can be cut into a size of 100 cm or less.

[0076] In some embodiments, a step of sorting waste polyester film containing a polyester component from the recovered resin substrate before performing the cutting process may be further performed.

[0077] The above crushed material can be transferred from the crusher (10) to the first washing device (20). In the first washing step, the crushed material can be washed in the first washing device (20) to form the first washed material.

[0078] A friction washer may be used as the first cleaning device (20), and the crushed material may be frictionally cleaned using water. By friction with water, foreign components such as impurities may be removed from the crushed material. In addition, if the waste polyester film has a laminated film form, high shear force may be applied by friction, causing the layers to be separated or peeled off, and the cleaning efficiency may be further improved.

[0079] The method of applying frictional force may not be limited as long as frictional force can be applied to the crushed material using water. For example, the frictional cleaning may be performed by stirring the crushed material while it is immersed in water using the first cleaning device (20). In another embodiment, the frictional cleaning may be performed by spraying water in the opposite direction to the direction in which the crushed material is supplied to the first cleaning device (20).

[0080] The first washing step is performed at a first washing temperature, and the first washing temperature may be 35°C or lower, specifically 10°C to 35°C, 10°C to 30°C, or 15°C to 30°C, and for example, the first washing step may be performed at room temperature. Within the above range, the cleaning efficiency of friction washing can be improved while suppressing damage and defects to the polyester raw material.

[0081] The washing time of the first washing step may be 1 minute or less, specifically 1 second to 50 seconds, 1 second to 30 seconds, or 1 second to 10 seconds. In the friction washing process, as high frictional and shear forces are applied to the crushed material, high separation and removal efficiency can be provided even when washing for the short time described above, and damage to the polyester component can be suppressed.

[0082] In some embodiments, the first washing step may be performed under atmospheric pressure conditions. In one embodiment, the first washing step may be performed at a rotational speed of 50 rpm or more, for example, at a rotational speed of 60 rpm or more, 80 rpm or more, 100 rpm or more, or 110 rpm or more. Additionally, the first washing step may be performed at a rotational speed of 300 rpm or less, 250 rpm or less, 200 rpm or less, or 150 rpm or less. Within these ranges, peeling of the laminated film may be made easier, and impurities may be efficiently removed.

[0083] The above first washing water can be discharged from the first washing device (20) to the pretreatment reactor (30).

[0084] In one embodiment, a dehydration process may be performed on the first rinse water before supplying it to the pretreatment reactor (30). For example, the first rinse water may be transferred from the first washing device (20) to a dehydration device to be dehydrated to have a moisture content of 10% or less, and then transferred to the pretreatment reactor (30) after the dehydration process.

[0085] The moisture content of the first rinse water can be controlled to a range of 8% to 10%. By controlling the moisture content of the first rinse water, the reactivity between the pretreatment aqueous solution and the first rinse water in the chemical cleaning step can be further enhanced, and the removal rate of heterogeneous components can be improved, thereby increasing the purity of the polyester component to be finally obtained.

[0086] Known devices may be used as the above dehydration device, for example, centrifugal dehydration devices, vacuum dehydration devices, screw presses, filter presses, belt presses, etc.

[0087] In one embodiment, a centrifugal dehydrator may be used as the dehydration device. The dehydration process may be performed at a speed of 1,000 rpm to 2,500 rpm, specifically at a speed of 1,500 rpm to 2,500 rpm, or at a speed of 1,500 rpm to 2,000 rpm. Within the above range, the moisture content can be easily adjusted to the above-described range without damaging the raw material.

[0088] In the above chemical cleaning step, the first water-washed water can be reacted with a pre-treatment aqueous solution through a pre-treatment reactor (30) to form a chemical cleaning product.

[0089] The above pretreatment aqueous solution may be alkaline. At least one heterogeneous component different from polyester may be dissolved in the above pretreatment aqueous solution and removed from the above first rinse water. In one embodiment, the heterogeneous component may include functional layer components such as an adhesive layer, a bonding layer, an anti-reflection layer, an anti-glare layer, a hard coating layer, a release layer, a UV blocking layer, and a polarizing layer contained in the waste polyester film. For example, the above heterogeneous component may include various adhesive components such as silicone-based adhesives, acrylic-based adhesives, urethane-based adhesives, and epoxy-based adhesives, and / or various adhesive components such as silicone-based adhesives, acrylic-based adhesives, urethane-based adhesives, and epoxy-based adhesives, and in addition to the adhesive / bonding components, it may also include additives such as antistatic agents, UV absorbers, stabilizers, catalysts, defoaming agents, surfactants, thickeners, antioxidants, foaming agents, conductive agents, leveling agents, dyes, and pigments.

[0090] Only heterogeneous components such as silicone and acrylic contained in the first rinse water can be dissolved or decomposed in the pretreatment aqueous solution without changing the physical properties of the polyester. Accordingly, heterogeneous components can be effectively separated and removed from the polyester components, and the finally obtained raw material can have physical properties suitable for reuse as a polyester film.

[0091] The above pretreatment aqueous solution may include an alkali agent and water. The alkali agent may include an inorganic alkali agent or an organic alkali agent.

[0092] Specifically, the pretreatment aqueous solution may include an organic alkali agent, and more specifically, may include an alkali solvent. As the pretreatment aqueous solution includes an alkali solvent as the alkali agent, the penetration of the pretreatment aqueous solution into the interface between the polyester substrate and the heterogeneous component (functional layer) can be made easier, and the decomposition, swelling, or elution of the heterogeneous component can be promoted. In addition, recovery and purification of the pretreatment aqueous solution can be made easier than when an inorganic alkali agent is used, thereby improving the reusability of the pretreatment aqueous solution and reducing process costs.

[0093] The above alkaline solvent may include quaternary alkyl ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, and tetrapropylammonium hydroxide; and amine compounds such as monomethylamine, dimethylamine, trimethylamine, 2-aminopentane, monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, 2-(dimethylamino)ethanol, 2-(diethylamino)ethanol, and 1-amino-2-propanol.

[0094] In some embodiments, the alkali solvent may include tetraalkylammonium hydroxide. Accordingly, heterogeneous components can be easily removed by the pretreatment aqueous solution without damaging the polyester component. For example, only other resin components can be selectively removed without dissolving or decomposing the polyester contained in the first rinse water, and a polyester component having superior physical properties can be recovered.

[0095] Specifically, the alkali agent may include tetramethylammonium hydroxide. Tetramethylammonium hydroxide has high cleaning performance on resin layers such as acrylic and silicone while minimizing damage and degradation to polyester, so the pretreatment performance for waste polyester film can be further improved. In addition, since the alkali agent includes tetraalkylammonium hydroxide, the pretreatment aqueous solution can have high removal performance for the functional layer or impurities even if the alkali agent is included in a relatively low amount.

[0096] In some embodiments, the pretreatment aqueous solution may further include a compatibilizer together with the alkali solvent. The compatibilizer may include at least one of an amine compound and an alcohol compound. The amine compound and the alcohol compound can increase the reactivity between the functional layer, such as an acrylic adhesive or a silicone adhesive, and the tetraalkylammonium hydroxide, thereby further promoting the removal of the functional layer from the waste polyester film. For example, the compatibilizer may penetrate the functional layer to assist in the swelling or elution of the functional layer, allowing the reaction between the alkali agent and the functional layer to proceed more easily. Therefore, the functional layer can be peeled off, eluted, or degraded from the waste polyester film regardless of the type, material, physical properties, etc. of the functional layer.

[0097] The above amine compounds may include monomethylamine, dimethylamine, trimethylamine, 2-aminopentane, monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, 2-(dimethylamino)ethanol, 2-(diethylamino)ethanol, 1-amino-2-propanol, etc. These may be used alone or in combination of two or more.

[0098] The above alcohol compounds may include methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, benzyl alcohol, ethylene glycol monomethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol, diethylene glycol, propylene glycol, glycerin, hexafluoro-2-propanol, etc. These may be used alone or in combination of two or more.

[0099] In one embodiment, the compatibilizer may include the amine compound and the alcohol compound together. For example, the compatibilizer may include a mixture of the amine compound and the alcohol compound. Accordingly, the penetration of the alkali agent into the interface between the substrate layer and the functional layer may be made easier, and the elution of the functional layer may be further promoted, thereby improving cleaning performance.

[0100] In one embodiment, the ratio of the weight of the compatibilizer to the weight of the alkali solvent may be 1 or more, greater than 1, 1.2 or more, 1.3 or more, 1.4 or more, or 1.5 or more, and may be 20 or less, 15 or less, 10 or less, 5 or less, 2.5 or less, or 2.0 or less. Within the above range, cleaning performance by the alkali solvent and the compatibilizer may be further improved, and the amount of compatibilizer used may be reduced, making it easier to purify and reuse the pretreatment aqueous solution. In some embodiments, the weight of water in the pretreatment aqueous solution may be 10 times or more the weight of the alkali solvent. For example, the weight of water in the pretreatment aqueous solution may be 10 to 30 times, 12 to 30 times, 15 to 30 times, or 18 to 30 times the weight of the alkali solvent. Within the above range, high cleaning performance can be maintained while making the reuse of the pretreatment aqueous solution easier, and the long-term stability of the pretreatment aqueous solution can be improved while preventing damage to the polyester component, thereby increasing cycle characteristics.

[0101] The above pretreatment aqueous solution may include an inorganic alkali agent. The inorganic alkali agent may include alkali metal hydroxides, alkali metal carbonates, alkali metal silicates, alkali metal phosphates, etc.

[0102] The alkali metal hydroxide may include lithium hydroxide, potassium hydroxide, sodium hydroxide, rubidium hydroxide, cesium hydroxide, etc. The alkali metal carbonate may include sodium carbonate, potassium carbonate, etc. The alkali metal silicate may include potassium silicate, sodium silicate, etc. The alkali metal phosphate may include sodium triphosphate, sodium pyrophosphate, potassium triphosphate, potassium pyrophosphate, etc.

[0103] In one embodiment, the pretreatment aqueous solution may include both an organic alkali agent and an inorganic alkali agent. For example, the pretreatment aqueous solution may include an alkali solvent, an inorganic alkylating agent, a compatibilizer, and water.

[0104] The pH of the above pretreatment aqueous solution may be 11 to 14. For example, the alkali agent may be included in the solvent (water) to satisfy the pH of the above range under conditions that satisfy the content range described above. Within the pH range of the above pretreatment aqueous solution, the reactivity of the pretreatment aqueous solution at the interface between the substrate layer (polyester layer) and the heterogeneous component (adhesive, etc.) may be further promoted, and the heterogeneous component may be more efficiently eluted and peeled off, allowing it to be more easily removed from the waste polyester film.

[0105] In one embodiment, the pretreatment aqueous solution may include additional components such as a surfactant, a pH adjuster, an antioxidant, an antifoaming agent, and a viscosity modifier, within a range that does not impair the cleaning performance of the alkali agent, the peelability of the substrate layer and the functional layer, or stability over time. In the pretreatment aqueous solution, water may be included as the remainder excluding the alkali agent and the additional components.

[0106] The above chemical cleaning step can be performed at a pretreatment temperature of 50°C or higher for a pretreatment time of 10 minutes or more.

[0107] If the above reaction temperature is less than 50 ℃, the reactivity between the pretreatment aqueous solution and the heterogeneous components may decrease. In addition, the viscosity of the pretreatment aqueous solution may increase at low temperatures, which may degrade cleaning performance and reduce the recovery and purification efficiency of the pretreatment aqueous solution.

[0108] In one embodiment, the pretreatment temperature may be 55°C or higher, 60°C or higher, 70°C or higher, or 80°C or higher, and may be 95°C or lower, 93°C or lower, 91°C or lower, or 90°C or lower. Specifically, the pretreatment temperature may be 50°C to 95°C, 55°C to 93°C, 55°C to 91°C, 60°C to 90°C, 70°C to 90°C, or 80°C to 90°C. Within the above range, heterogeneous components can be easily removed while suppressing the dissolution and decomposition of polyester components due to high reaction temperatures.

[0109] If the above pretreatment time is less than 10 minutes, the reactivity may be reduced because the above pretreatment aqueous solution may not sufficiently penetrate into the above heterogeneous component. The above pretreatment time may be 20 minutes or more, 25 minutes or more, or 30 minutes or more, and may be 60 minutes or less, 50 minutes or less, 45 minutes or less, or 40 minutes or less. Specifically, the above pretreatment time may be 10 minutes to 60 minutes, 20 minutes to 50 minutes, 25 minutes to 45 minutes, or 30 minutes to 40 minutes. Within the above range, excellent cleaning performance by pretreatment can be maintained while preventing damage to the polyester component due to a long reaction time.

[0110] The pretreatment reactor (30) may be a batch-type reactor. By using a batch-type reactor for pretreatment, the reaction conditions between the first rinse water and the pretreatment aqueous solution can be easily controlled, thereby further improving the removal rate of heterogeneous components while minimizing damage to the polyester raw material.

[0111] The first rinse water is stirred while immersed in the pretreatment aqueous solution in the pretreatment reactor (30) and can flow between the upper and lower parts of the pretreatment reactor (30). For example, by the rotation of the impeller of the pretreatment reactor (30), a downward flow is generated at the upper part to induce the first rinse water to descend, and an upward flow is generated at the lower part to induce the first rinse water to ascend. The impregnation rate and reactivity with respect to the pretreatment aqueous solution can be increased by the up-and-down flow of the first rinse water, and accordingly, the decomposition rate of heterogeneous components can be further improved.

[0112] The pretreatment reactor (30) may include a plurality of reactors. For example, depending on the throughput of raw materials, the scale of the process, etc., the pretreatment reactor (30) may include two or more, three or more, or four reactors, and the first washing water may be supplied to each reactor.

[0113] In the chemical cleaning step above, the pretreatment aqueous solution and the first rinse water may be stirred at a rotational speed of 40 rpm or more. Specifically, the pretreatment aqueous solution and the first rinse water may be stirred at a rotational speed of 40 rpm to 100 rpm, 50 rpm to 90 rpm, 50 rpm to 80 rpm, 50 rpm to 70 rpm, or 55 rpm to 65 rpm. Within the above range, the reactivity of the pretreatment aqueous solution and the first rinse water is enhanced, and the removal rate of heterogeneous components may be increased.

[0114] The chemical cleaning material can be discharged from the pretreatment reactor (30) to the second cleaning device (40). Before supplying the chemical cleaning material to the second cleaning device (40), a dehydration process using a dehydration device such as a centrifugal dehydration device or a screw conveyor may be further performed.

[0115] In one embodiment, a centrifugal dehydrator may be used as the dehydrator, and the dehydration process may be performed at a speed of 1000 rpm to 2500 rpm, 1500 rpm to 2500 rpm, or 1500 rpm to 2000 rpm.

[0116] In one embodiment, the dehydration process may be repeated multiple times to control the moisture content of the chemically cleaned material. For example, a first dehydration process may be performed on the chemically cleaned material at a speed of 800 rpm to 2000 rpm, 800 rpm to 1500 rpm, or 1000 rpm to 1500 rpm, and a second dehydration process may be performed continuously at a speed of 1000 rpm to 2500 rpm, 1500 rpm to 2500 rpm, or 1500 rpm to 2000 rpm. Within the above range, the pretreatment aqueous solution and water remaining on the chemically cleaned material can be easily recovered and collected without damaging the raw material.

[0117] In the second washing step, the chemical cleaning material may be immersed in water or sprayed with water in the second washing device (40) to form the second washing material. The chemical cleaning material may be immersed in water to remove impurities and foreign components, and any remaining pretreatment aqueous solution after the chemical cleaning step may be washed away from the chemical cleaning material.

[0118] The second rinsing temperature may be 25°C or higher, for example, 25°C to 80°C, 25°C to 70°C, or 25°C to 60°C. The washing time of the second rinsing step may be 1 minute or less, specifically 1 second to 50 seconds, 1 second to 30 seconds, 5 seconds to 20 seconds, or 5 seconds to 15 seconds. Within the above range, heterogeneous components and impurities can be effectively removed while preventing defects in the polyester component, and the pretreatment aqueous solution remaining on the chemically cleaned material can be removed.

[0119] In some embodiments, the second washing step may be performed at a second washing temperature higher than the first washing temperature. By performing a re-washing process at a relatively high temperature in the second washing step, cleaning performance can be supplemented and compensated even if the washing process is performed at a low temperature in the first washing step. Therefore, damage to the raw material caused by high temperature and high shear in the first washing step can be suppressed, while residues such as impurities can be effectively removed in the second washing step.

[0120] In one embodiment, the second cleaning device (40) may include a plurality of reaction vessels. Specifically, the second cleaning device (40) may include two or more reaction vessels, and the cleaning process for the chemical cleaning material using the reaction vessels may be performed continuously. For example, the second cleaning device (40) may include a first reaction vessel and a second reaction vessel connected in series, and the chemical cleaning material may be supplied from the pretreatment reactor (30) to the first reaction vessel and cleaned for a temperature and time within the range described above, and then continuously supplied from the first reaction vessel to the second reaction vessel and cleaned again for a temperature and time within the range described above.

[0121] Polyester components can be recovered from the second rinse water. In order to recover the polyester components, residual water and / or pretreatment aqueous solution, etc., may be removed, and, for example, the second rinse water may be discharged from the second washing device (40) to the drying device (50).

[0122] In one embodiment, a dehydration process may be performed on the second washed water before supplying it to the drying device (50). For example, the second washed water may be transferred from the second washing device (40) to the dehydration device and dehydrated to have a moisture content of 8% or less, specifically in the range of 6% to 8%, and then transferred to the drying device (50) after the dehydration process. The moisture content of the second washed water may be adjusted to within the above range so that a more efficient drying process can be performed.

[0123] A known device may be used as the dehydration device, for example, a centrifugal dehydration device, a vacuum dehydration device, a screw press, a filter press, a belt press, etc. The dehydration process may be performed at a speed of 1,000 rpm to 3,500 rpm, specifically at a speed of 1,500 rpm to 3,000 rpm, or 2,000 rpm to 3,000 rpm. Within the above range, the moisture content of the second washed material can be easily adjusted to the above-described range.

[0124] A drying step for the second rinse water may be performed in a drying device (50). Water and / or pretreatment aqueous solution remaining in the second rinse water may be removed by the drying process. The moisture content of the second rinse water may be reduced to 6% or less, or 5% or less by the drying process, and may be dried until it has a moisture content of, for example, 1% to 5%.

[0125] The temperature of the above drying process may be 100°C or higher, for example, 100°C to 200°C, 110°C to 180°C, 120°C to 150°C, or 120°C to 140°C.

[0126] In one embodiment, the drying process may be performed for 30 seconds to 30 minutes, 30 seconds to 20 minutes, 30 seconds to 10 minutes, or 30 seconds to 1 minute. As a drying method, known drying methods such as vacuum drying, hot air drying, heat drying, and pressure drying may be used, and as a drying device (50), an infrared heater, a coil heater, an oven, a microwave, a hot air dryer, a vacuum dryer, a steam-utilizing drying facility, etc. may be used.

[0127] The above-mentioned dried polyester component can be recovered. The recovered polyester component may be stored in a designated storage tank or container, etc. The recovered polyester component may be reused as a raw material for manufacturing recycled polyester film.

[0128] In embodiments of the present invention, raw materials such as crushed material, first washed material, chemically cleaned material and second washed material, heterogeneous components, and used pretreatment aqueous solution may be transported along each transport path through a conveying device such as a belt conveyor, screw conveyor, attach conveyor, horizontal conveyor, vertical conveyor, air feeder, and air blower. The type and number of the conveying devices may be appropriately selected considering the size of the process, the type and amount of raw materials being transported, and the length of the transport path, and for example, a plurality of conveying devices may be used in combination.

[0129] FIG. 6 is a schematic process flow diagram of a recycling process for waste polyester film according to exemplary embodiments. For convenience of explanation, the processes, apparatus, methods, etc. described in FIG. 5 may be omitted in FIG. 6.

[0130] In FIG. 6, the path indicated by the solid arrow represents the path through which the polyester component intended for recovery moves. In FIG. 6, the path indicated by the dotted arrow represents the path through which heterogeneous components such as the pretreatment aqueous solution, water, and impurities move. However, this only signifies the main target of movement in each path; pretreatment solution, water, or heterogeneous components may exist together with the polyester component in the path indicated by the solid arrow, and a small amount of polyester component may exist in the path indicated by the dotted arrow.

[0131] Referring to FIG. 6, the pretreatment aqueous solution used in the chemical cleaning step can be recovered and purified and reused in the chemical cleaning step.

[0132] In one embodiment, the chemical cleaning step may include: supplying the pretreatment aqueous solution to a pretreatment reactor to which the first washing water is supplied (e.g., step S10); reacting the first washing water with the pretreatment aqueous solution in the pretreatment reactor to form the chemical cleaning product (e.g., step S20); recovering the pretreatment aqueous solution that has reacted with the first washing water from the pretreatment reactor (e.g., step S30); and purifying the recovered pretreatment aqueous solution in a purification system and supplying it back to the pretreatment reactor (e.g., step S40).

[0133] In the chemical cleaning step above, after step S20 is completed, the used pretreatment aqueous solution is routed from the pretreatment reactor (30) via path R 1-1 It can be recovered along and supplied to a purification system.

[0134] The chemical cleaning material formed in step S20 can be supplied to a dehydration device (60) and dehydrated. The pretreatment aqueous solution remaining in the chemical cleaning material can be recovered and collected by the dehydration process, and path R 1-2 It can be supplied to a purification system along with.

[0135] In one embodiment, path R 1-1 and path R 1-2 It can be assembled at path R1 and supplied to the purification system. However, it is not limited thereto, and path R 1-1 and path R 1-2 Each of these may also be supplied individually to the above-mentioned purification system.

[0136] In the purification system above, the pretreatment aqueous solution used can be purified to have a purity greater than or equal to a predetermined value. The purity of the pretreatment aqueous solution may refer to the concentration of impurities contained in the pretreatment aqueous solution, the concentration of an alkali agent in the pretreatment aqueous solution, etc., and the predetermined value refers to a purity having a level of cleaning ability usable in step S20, and can be predetermined by considering the type, concentration, content, flow rate, size of the pretreatment reactor, reaction conditions, etc. of the first washing water supplied in step S10. For example, the predetermined value may be set to a composition substantially similar to the composition of the pretreatment aqueous solution described in FIG. 1.

[0137] For example, the pretreatment aqueous solution used in the purification system may be filtered to remove solid impurities, etc. The filtration may be performed using a filter screen having a mesh of a predetermined size. For example, the mesh size of the filter screen may be 5 mm or less, 3 mm or less, 1 mm or less, 0.5 mm or less, 0.1 mm or less, or 0.06 mm or less, or 0.01 mm or more, 0.02 mm or more, or 0.04 mm or more. The filter screen may be provided inside the purification system, or in a path R1, R that flows into the purification system. 1-1 or path R 1-2 It may be equipped in.

[0138] The concentration of the alkali agent can be controlled by supplying an alkali agent (e.g., an alkali solvent) and / or a compatibilizer to the filtered pretreatment aqueous solution or by treating the water as wastewater. For example, additional components may be added or removed so that the filtered pretreatment aqueous solution satisfies the composition of the alkali agent and water, or the composition of the alkali agent, compatibilizer, and water of the pretreatment aqueous solution supplied in step S20. For example, the concentration of the alkali agent may be controlled so that the weight of water contained in the pretreatment aqueous solution is at least 10 times the weight of the alkali agent; specifically, the weight of water contained in the pretreatment aqueous solution may be controlled to be 10 to 30 times, 12 to 30 times, 15 to 30 times, or 18 to 30 times the weight of the alkali agent. Known methods for treating the water in the pretreatment aqueous solution as wastewater, such as vacuum distillation or evaporation concentration, may be used.

[0139] The purified pretreatment aqueous solution can be supplied to the pretreatment reactor (30) via path R2 for reuse, and step S10 can be restarted. For example, steps S10 through S40 may be a closed-loop system performed continuously. By recovering and purifying the used pretreatment aqueous solution for reuse, process costs can be reduced, and environmental pollution caused by the disposal of alkali agents and the generation of toxic substances can be prevented.

[0140] The purity of the purified pretreatment aqueous solution in the purification system may be measured, and a pretreatment aqueous solution having a purity greater than or equal to a predetermined value may be supplied to the pretreatment reactor, while a pretreatment aqueous solution having a purity less than the predetermined value may be supplied back to the purification system. For example, in step S40, the purification process for the pretreatment aqueous solution may be repeated multiple times until the purity of the predetermined value is satisfied.

[0141] The wastewater treated in the above purification system can be discharged through path R4. In one embodiment, the wastewater treated water may be purified through another purification system and reused in the recycling process.

[0142] In one embodiment, water used in the first washing step can be recovered, purified, and reused in a recycling process, specifically in the first washing step. This can reduce the amount of water consumed in the recycling process and prevent environmental pollution caused by contaminated water being treated as wastewater.

[0143] After friction washing of the crushed material is completed in the first washing device (20), the water used is in path R 6-1It can be transferred to a purification system through. For example, water remaining on the first washed material can be separated and collected through a dehydration device in the path moving from the first washing device (20) to the pretreatment reactor (30), and the collected water is in path R 6-1 It can be supplied to the purification system through.

[0144] Water used in the first washing device (20) can be filtered in a purification system to remove solid impurities, etc. The filtration can be performed using a filter mesh having a predetermined size. For example, the mesh size of the filter mesh may be 5 mm or less, 3 mm or less, 1 mm or less, 0.5 mm or less, 0.1 mm or less, or 0.06 mm or less, and may be 0.01 mm or more, 0.02 mm or more, or 0.04 mm or more.

[0145] The above filtered water is path R 6-2 It can be supplied back to the first washing device (20) through [link] and can be reused for friction washing of the crushed material. The solid impurities filtered in the purification system are route R 3-1 It can be transferred to an SRF device, and converted into a solid fuel product in the SRF device and reused in the recycling process of waste polyester film.

[0146] In one embodiment, the water used in the second washing step can be recovered, purified, and reused in a recycling process, specifically in the second washing step.

[0147] Water used in the second washing device (40) can be filtered in a purification system to remove solid impurities, etc. The filtration can be performed using a filter mesh having a predetermined size. For example, the mesh size of the filter mesh may be 5 mm or less, 3 mm or less, 1 mm or less, 0.5 mm or less, 0.1 mm or less, or 0.06 mm or less, and may be 0.01 mm or more, 0.02 mm or more, or 0.04 mm or more.

[0148] The above filtered water is path R 7-2 It can be supplied back to the second washing device (40) through. The solid impurities filtered in the purification system are route R 3-2 It can be transferred to an SRF device, and converted into a solid fuel product in the SRF device and reused in the recycling process of waste polyester film.

[0149] The recycling method of the present invention may further include the step of selecting and crushing combustible raw materials among the heterogeneous components separated from the first washing water to form a solid refuse fuel product (solid refuse fuel, SRF).

[0150] For example, the impurities filtered in step S40, specifically heterogeneous components, may be supplied from the purification system to the SRF device via path R3. Combustible raw materials among the heterogeneous components may be separated in the SRF device. For example, the combustible raw materials may include acrylic adhesives, silicone adhesives, combustible synthetic resins, papers, etc., and non-combustible materials such as glass and metal may be removed through the separation process. Specific gravity separation, wind separation, magnetic separation, vibration separation, optical separation, etc., may be used as the separation method.

[0151] The selected combustible raw material can be crushed to form a solid fuel product. The solid fuel product may be crushed and used in the form of fluff, or the crushed combustible fuel may be molded and used in the form of pellets.

[0152] A drying process for the crushed combustible raw material may be further performed, and the moisture of the combustible raw material may be evaporated using a high-temperature heat source such as hot air. In one embodiment, the moisture content of the combustible raw material may be controlled to 40% or less through the drying process. For example, the moisture content of the combustible raw material after the drying process may be less than 40%, 35% or less, 30% or less, or 20% or less. Accordingly, the combustibility of the solid fuel product may be further increased, and the calorific value and energy conversion rate may be further improved.

[0153] The above solid fuel product may further include carbon-based additive materials. For example, a solid fuel product can be formed by adding a carbon-based material to the crushed combustible fuel. Accordingly, the calorific value of the solid fuel product can be further enhanced, and energy efficiency can be improved.

[0154] The above solid fuel product can be reused as an energy source for the recycling method of the waste polyester film. The above solid fuel product can be appropriately supplied and used through path R5 at a stage of the recycling method that requires external energy, and can be used as an energy source, for example, in the crushing process, conveying process, pretreatment process, washing process, etc.

[0155] By reusing impurities, such as heterogeneous components disposed of from waste polyester film, as solid fuel products, the energy consumption of the recycling process can be reduced, and eco-friendly recycling can be achieved at a low cost.

[0156] The recycling method of the present invention may further include a specific gravity separation step for separating the polyester component from the second rinse water prior to the recovery step, specifically prior to the drying process. The waste polyester film may further include other heterogeneous plastics in addition to the polyester substrate. In this case, heterogeneous plastics may remain in the second rinse water even after undergoing the washing and chemical cleaning processes. Therefore, to increase the purity of the polyester component, the polyester component can be selected, separated, and recovered from the heterogeneous plastics.

[0157] The above polyester component can be separated from other heterogeneous plastics contained in the second rinse water and recovered using the difference in specific gravity. Additionally, heterogeneous plastic components having a specific gravity different from that of the polyester component can be separated and recovered individually.

[0158] The above gravity separation step may be performed in a separate device or process after the above second washing step. For example, the above second washed water may be transferred from the second washing device (40) to the gravity separation device (70). In the gravity separation device (70), the polyester component may be separated and sorted from polyolefins such as polypropylene and polyethylene having a lower specific gravity than the polyester component.

[0159] The solvent used in the above specific gravity separation step can be selected by considering the specific gravity of each plastic. For example, water can be used as a solvent to separate plastics with a specific gravity greater than 1 and plastics with a specific gravity less than 1. When water is used as a solvent, polyester, which has a specific gravity heavier than water, sinks, and polyolefin, which has a specific gravity lighter than water, floats, and the polyolefin can be separated and recovered by removing the floating material.

[0160] In addition, by mixing water, organic solvents, and salts in appropriate proportions to control the specific gravity of the solvent, various types of plastics with small differences in specific gravity can be easily separated and recovered through specific gravity separation. Accordingly, other heterogeneous plastics contained in the second rinse water, such as fluorine resin, vinyl chloride resin, nylon, etc., can be separated from polyester and recovered.

[0161] By separating and sorting the above polyester component from heterogeneous plastic, the purity and recovery rate of the finally recovered polyester component can be further increased, and the physical properties of the recycled polyester formed using this as a raw material can be further improved.

[0162] The selected heterogeneous plastics can be recovered and collected from the specific gravity separation device (70) via path R8. The recovered heterogeneous plastics may be transferred to the SRF process to be converted into energy as solid fuel products, or may be used in the recycling process of heterogeneous plastics.

[0163] In one embodiment, a sink float tank may be used as the specific gravity separation device (70).

[0164] In one embodiment, the recovered polyester component can be reused through a mechanical recycle process or a chemical recycle process. Through the recycling process, a recycled component can be obtained from the recovered polyester component.

[0165] For example, the above-mentioned recycled component may refer to a component derived from a monomer, oligomer, or polymer obtained by decomposing, depolymerizing, reprocessing, or repolymerizing a polyester component by physical or chemical methods.

[0166] The above recycled components may include recycled bis-2-hydroxyethyl terephthalate (r-BHET), recycled dimethyl terephthalate (r-DMT), recycled dibutyl terephthalate (r-DBTP), recycled diisooctyl terephthalate (r-DOTP), recycled terephthalic acid (r-TPA), recycled ethylene glycol (r-EG), physically recycled polyethylene terephthalate (MR-PET), chemically recycled polyethylene terephthalate (CR-PET), etc.

[0167] In one embodiment, the recovered polyester component can be reused through a physical recycling process. For example, the recovered polyester component can be recycled through processes such as crushing or melting. Specifically, the recovered polyester component can be pelletized to obtain a pellet-shaped polyester, and can be reprocessed into mechanically recycled polyester by melting or extrusion.

[0168] In one embodiment, the recovered polyester component can be reused through a chemical recycling process. For example, the polyester component can be recycled by breaking it down into monomers, oligomers, or prepolymers through chemical methods such as pyrolysis or solvent decomposition.

[0169] In some embodiments, the recovered polyester component may be introduced into a depolymerization process. The depolymerization process may be carried out, for example, using a glycolysis reaction, an alcoholylysis reaction, a hydrolysis reaction, a methanolysis reaction, an ammonolysis reaction, an aminolysis reaction, etc.

[0170] Through the above depolymerization process, a recycled component can be obtained from the polyester component.

[0171] In one embodiment, the depolymerization process may be performed using a glycolysis reaction that decomposes the pretreated polyester component using a glycol such as ethylene glycol or diethylene glycol. Accordingly, a regenerated component including regenerated bis(2-hydroxyethyl)terephthalate (r-BHET), etc., may be obtained.

[0172] In other embodiments, the depolymerization process may be carried out through a methanolosis reaction using methanol, thereby obtaining a regenerated component including regenerated dimethyl terephthalate (α-DMT), etc. Additionally, the depolymerization process may be carried out through an alcoholosis reaction using an alcohol having 4 or more carbon atoms or a hydrolysis reaction using water, thereby obtaining a regenerated component including regenerated terephthalic acid (r-TPA) or regenerated ethylene glycol (r-EG), etc.

[0173] In the above depolymerization process, the amount of reactant (e.g., glycol, methanol, etc.) added may be 1 or more, 2 or more, or 3 or more times the weight of the waste polyester film, and may also be 7 or less, 5 or less, or 4 or less.

[0174] In the above depolymerization process, a catalyst may be further used. The catalyst may include a metal catalyst, a metal salt catalyst, or a metallic organic catalyst. The catalyst may be an acetate, carbonate, oxide, or hydroxide of a metal, and the metal may be an alkali metal, an alkaline earth metal, a transition metal, etc. Specifically, the catalyst may be at least one of zinc acetate, sodium acetate, cobalt acetate, and manganese acetate, or in the form of a hydrate or anhydrous form thereof.

[0175] In one embodiment, the depolymerization process can also be carried out as a catalyst-free reaction without using a catalyst.

[0176] According to one embodiment, a reaction product obtained by depolymerizing the polyester component can be filtered, washed, and dried to obtain a solid regenerated component.

[0177] For example, the reaction product can be cooled to obtain a solution in the form of a slurry, and the slurry can be filtered to remove insoluble foreign substances. The cooling temperature may be 50°C or higher, 60°C or higher, 70°C or higher, 80°C or higher, or 90°C or higher, and may be 150°C or lower, 140°C or lower, 130°C or lower, 120°C or lower, 110°C or lower, or 100°C or lower. Within the above range, the regenerating component (e.g., BHET, DMT, etc.) may exist in a liquid form, making filtration and removal of insoluble foreign substances easier.

[0178] The filtered liquid can be cooled to crystallize the regenerated component. The temperature during cooling crystallization may be, for example, 70°C or lower, 60°C or lower, 50°C or lower, 40°C or lower, 30°C or lower, or 25°C or lower, and may also be 0°C or higher, 5°C or higher, 10°C or higher, 15°C or higher, or 20°C or higher.

[0179] The above crystallized material may be filtered or subjected to solid-liquid separation, and the filtered solid may be washed. The obtained washed material may be vacuum dried to obtain a solid regenerated component. A polyester resin or a polyester film may be manufactured using the solid regenerated component. For example, the regenerated component obtained through the above chemical recycling method may be introduced into a polyester repolymerization process to obtain chemically recycled polyester.

[0180] As functional layers, such as resin layers, are efficiently removed from waste polyester films by the above recycling or pretreatment process, the recycled components (e.g., BHET, DMT, etc.) obtained by the above depolymerization method can exhibit high purity. Therefore, the physical properties of the recycled polyester manufactured using this, such as processability, transparency, heat resistance, and stretchability, can be excellent.

[0181] The present invention will be explained in more detail below through the following examples. However, the following examples are merely illustrative of the present invention, and the scope of the present invention is not limited thereto.

[0182] [Example 1]

[0183] (Grinding step) Waste polyester film containing polyethylene terephthalate (PET) and polyethylene (PE) as substrates and an adhesive was fed into a hydraulic cutter and ground, and the ground material was obtained by filtering through a 30 mm mesh.

[0184] (1st washing step) The above-mentioned crushed material was fed into a friction washer and high-speed friction washing was performed by spraying water at 120 rpm for 5 seconds under ambient temperature and atmospheric pressure conditions, then filtered through a 3 mm size mesh, and the filtered material was fed into a spinner and dewatered at 1800 rpm to obtain the 1st washing material.

[0185] (Chemical cleaning step) The first rinse water was transferred to a batch-type pretreatment reactor (Hot Washing Machine) using an air blow method, and Solution A, comprising quaternary alkylammonium hydroxide, an amine compound, an alcohol compound, and water, was introduced into the pretreatment reactor as a pretreatment aqueous solution. Specifically, Solution A, comprising 5 wt% tetramethylammonium hydroxide (TMAH), 3 wt% diethanolamine, 4.5 wt% benzyl alcohol, and 87.5 wt% water, was used as the pretreatment aqueous solution. The first rinse water and the pretreatment aqueous solution were reacted by stirring at 55 rpm to 65 rpm for 30 minutes while maintaining the temperature of the pretreatment reactor at 60 ℃. After the reaction was completed, the reaction mixture was introduced into a spinner and dehydrated at a rotation speed of 1000 rpm to obtain a chemically cleaned product.

[0186] (Second washing step) The chemically cleaned material was fed into a spinner and dewatered again at a rotational speed of 2500 rpm, and then fed into a washing machine having two continuously connected reactors. In each reactor, the chemically cleaned material was immersed in water at a temperature of 50 ℃ for 10 seconds to be washed continuously, and then dewatered at a rotational speed of 1800 rpm to obtain the second washed material.

[0187] (Specific gravity separation step) The second washing material was introduced into a sink float tank, and the polyethylene component and polyester component were separated and recovered through specific gravity separation. The recovered polyester component was introduced into a spinner and dewatered at a rotational speed of 2,500 rpm to reduce the moisture content to 10%, then transferred to a squeezer and dewatered by squeezing until the moisture content reached 8%.

[0188] (Drying step) The above dehydrated material was transferred to a first coil heating dryer using an air blow method and dried at a temperature of 120°C for 60 seconds to reduce the moisture content to 6%, and then continuously fed into a second coil heating dryer and dried at a temperature of 120°C for 60 seconds to reduce the moisture content to 5% or less.

[0189] The water recovered after the dehydration process through a spinner in the first washing step, chemical cleaning step, second washing step, and specific gravity separation step was filtered using a mesh of 40㎛ to 60㎛ and then reused in the first washing step, chemical cleaning step, second washing step, and specific gravity separation step, respectively.

[0190] In addition, after the chemical cleaning step, the pretreatment aqueous solution was recovered from the reactor, the reactants, and the spinner and filtered through a mesh of 40 μm to 60 μm. The composition of the pretreatment aqueous solution was analyzed, and deficient components were added so that the composition of the purified pretreatment aqueous solution satisfied the composition of the pretreatment aqueous solution introduced in the chemical cleaning step. The purified pretreatment aqueous solution was then introduced back into the pretreatment reactor.

[0191] The insoluble matter filtered through the above mesh was recovered, and the SRF process was performed to obtain solid combustion fuel. The solid combustion fuel was reused as an energy source at each stage.

[0192] [Example 2]

[0193] In the chemical cleaning step above, the recycling process was carried out in the same manner as in Example 1, except that a solution B containing quaternary alkyl ammonium hydroxide, an amine compound, and water was used as the pretreatment aqueous solution. Specifically, a solution B containing 5-10 wt% TMAH, 20-30 wt% 2-aminopentane, 45-55 wt% ethanolamine, and 15-20 wt% water was diluted with water at a weight ratio of 3:7 and used as the pretreatment aqueous solution.

[0194] [Example 3]

[0195] A recycling process was carried out in the same manner as in Example 1, except that a 10% (w / w) concentration NaOH aqueous solution was introduced as the pretreatment aqueous solution into the above pretreatment reactor.

[0196] Experimental Example 1: Adhesive Removal Evaluation

[0197] The removal evaluation of the adhesive was performed using the method according to the examples, with different components and content of the adhesive contained in the waste polyester film. Specifically, based on the total weight of the film, the evaluation was conducted for each of the following: Film A containing 10 wt% of silicone-based adhesive, Film B containing 12 wt% of silicone-based adhesive, Film C containing 7 wt% of acrylic-based adhesive, and Film D containing 20 wt% of acrylic-based adhesive.

[0198] A simplified depolymerization insolubility evaluation was performed to assess the amount of insoluble matter (heterogeneous components excluding PET) remaining in the recovered polyester component. Specifically, 10 g of the recovered waste polyester film was placed in a flask along with 40 g to 100 g of ethylene glycol (adjusted according to the bulk density of the film) and a metal catalyst, and dissolved by stirring at a temperature of 195°C. Subsequently, the solution was filtered using filter paper to recover the insoluble matter that did not dissolve in the ethylene glycol. The simplified depolymerization insolubility was evaluated by calculating the ratio of the weight (g) of the recovered insoluble matter to the 10 g of the waste polyester film as a percentage. The evaluation results are shown in Table 1 below.

[0199] The evaluation criteria for adhesive removal are as follows. The evaluation results are shown in Table 1 below.

[0200] [metewand]

[0201] ◎: Insoluble matter less than 1%

[0202] ●: Insoluble matter 1% or more to less than 3%

[0203] ○: Insoluble matter 3% or more to less than 5%

[0204] ×: Insoluble matter 5% or more

[0205] Silicone-based adhesive Acrylic-based adhesive 10 wt% (Film A) 12 wt% (Film B) 7 wt% (Film C) 20 wt% (Film D) Example 1 ●◎◎◎ Example 2 ●◎◎× Example 3 ○◎◎×

[0206] Referring to Table 1, in the case of the examples, a significant amount of heterogeneous components were removed from the waste polyester film through a pretreatment process, and the amount of residual heterogeneous components in the recovered polyester raw material was small, showing a purity level suitable for the reuse process as polyester film.

[0207] Meanwhile, in the case of Example 1, in which the above-mentioned solution A was used as the pretreatment aqueous solution, excellent adhesive removal performance was exhibited for all films A to D, and relatively high pretreatment performance was provided compared to the cases of Examples 2 and 3, in which the above-mentioned solution B and NaOH aqueous solution were used as the pretreatment aqueous solutions, respectively.

[0208] As described above, according to one embodiment, sorting and recycling treatment of waste polyester film are performed by optimizing for a closed loop in which a resource-circulating product is produced identically or similarly to the original waste through recycling treatment, so that at least a portion of the resource-circulating product is recirculated as waste for recycling treatment. According to an embodiment of the present invention, by generating, updating, and distributing digital proof information including information on the waste and resource-circulating tracking information corresponding to the waste, it is possible to facilitate the tracking of information on the waste, and the ease and accuracy of waste classification can be improved. As a result, carbon emissions and costs can be optimized for the entire lifecycle of the product, and the total cost of resource-circulating treatment can be reduced through the reduction of production costs for the resource-circulating product.

[0209] Furthermore, through a recycling process that includes a pretreatment to efficiently remove impurities and heterogeneous components from waste polyester film without causing damage or defects to the polyester raw materials, high-purity polyester raw materials can be recovered and obtained at low cost and high efficiency without degrading the physical properties of the polyester. In addition, the obtained polyester raw materials can be easily reused in the process of manufacturing new polyester.

[0210] Furthermore, the pretreatment aqueous solution used in the recycling process and the heterogeneous components recovered from the recycling process can be purified and converted into energy, allowing them to be reused in subsequent recycling processes. Consequently, the cost and energy consumption of the recycling process are reduced, providing a more environmentally friendly recycling process.

[0211] Meanwhile, a computer program stored on a computer-readable recording medium may be implemented to include instructions for a processor to perform each step included in the method for providing a resource circulation value chain solution according to the above-described embodiment.

[0212] In addition, a computer program including instructions for a processor to perform each step included in the method for providing a resource circulation value chain solution according to the above-described embodiment may be recorded on a computer-readable recording medium.

[0213] Combinations of each step of each flowchart attached to the present invention may be performed by computer program instructions. Since these computer program instructions may be loaded into the processor of a general-purpose computer, a computer for special purposes, or other programmable data processing equipment, the instructions performed through the processor of the computer or other programmable data processing equipment create means for performing the functions described in each step of the flowchart. Since these computer program instructions may also be stored in a computer-available or computer-readable recording medium that can be oriented toward the computer or other programmable data processing equipment to implement the function in a specific manner, the instructions stored in the computer-available or computer-readable recording medium may also produce a manufactured item containing instruction means for performing the function described in each step of the flowchart. Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that execute a computer or other programmable data processing equipment by performing a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in each step of the flowchart.

[0214] Additionally, each step may represent a module, segment, or part of code containing one or more executable instructions for executing a specified logical function(s). Also, it should be noted that in some alternative embodiments, the functions mentioned in the steps may occur out of order. For example, two steps described in succession may actually be performed substantially simultaneously, or the steps may sometimes be performed in reverse order according to the corresponding function.

[0215] The above description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential quality of the present invention.

[0216] As described above, the technical concept of the present invention is not limited by the embodiments disclosed for the purpose of explaining the present invention. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within the equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A method of providing a solution performed by a waste treatment device capable of supporting a resource circulation value chain that produces resource circulation products through the recycling treatment of waste polyester film, Regarding the above waste polyester film, a step of classifying objects for a closed-loop; and The method includes the step of providing at least a portion of the waste polyester film classified as a target for the closed loop as a chemical recycling raw material for input into the production process of the resource recycling product through the recycling treatment. The above-mentioned object for the closed loop is a resource-circulating product that is identical or similar to the original waste through the recycling process, wherein at least a portion of the resource-circulating product is recirculated as waste for the recycling process. Method for providing polyester film resource recycling value chain solutions.

2. In Paragraph 1, The step of classifying objects for the closed loop comprises obtaining information regarding the waste polyester film and resource circulation tracking information from digital proof information corresponding to the waste polyester film, and classifying the objects for the closed loop based on the information obtained from the digital proof information. Method for providing polyester film resource recycling value chain solutions.

3. In Paragraph 2, The information included in the above digital proof information is transparent by utilizing a distributed ledger through blockchain technology Method for providing polyester film resource recycling value chain solutions.

4. In Paragraph 2, The above digital proof information is generated or updated by the waste treatment device or generated or updated by another device involved in the resource circulation value chain. Method for providing polyester film resource recycling value chain solutions.

5. In Paragraph 1, The step of providing the above chemically recycled raw material is, A first washing step of forming a first washing solution by frictionally washing the above waste polyester film using water; A chemical cleaning step of forming a chemically cleaned product by washing the above first washed product with an alkaline pretreatment aqueous solution; A second washing step of immersing the above chemical cleaning product in water to form a second washing product; and A recovery step for recovering a polyester component from the second rinse water; comprising Method for providing polyester film resource recycling value chain solutions.

6. In Paragraph 5, In the chemical cleaning step above, at least one heterogeneous component different from the polyester is dissolved in the pretreatment aqueous solution and removed from the first rinse water. Method for providing polyester film resource recycling value chain solutions.

7. In Paragraph 6, The above heterogeneous component comprises at least one of an adhesive, an adhesive, and an additive. Method for providing polyester film resource recycling value chain solutions.

8. In Paragraph 6, The method further comprises the step of selecting and crushing combustible raw materials among the heterogeneous components separated from the first washing water to form a solid refuse fuel (SRF). Method for providing polyester film resource recycling value chain solutions.

9. In Paragraph 8, The above solid fuel product is reused as an energy source for performing the step of providing the above chemically recycled raw material. Method for providing polyester film resource recycling value chain solutions.

10. In Paragraph 5, The first washing step is performed at a first washing temperature, and the second washing step is performed at a second washing temperature higher than the first washing temperature. Method for providing polyester film resource recycling value chain solutions.

11. In Paragraph 5, The above pretreatment aqueous solution comprises an alkaline solvent and water, wherein the weight of water in the pretreatment aqueous solution is at least 10 times the weight of the alkaline solvent. Method for providing polyester film resource recycling value chain solutions.

12. In Paragraph 5, The pretreatment aqueous solution used in the above chemical cleaning step is recovered and purified and reused in the above chemical cleaning step. Method for providing polyester film resource recycling value chain solutions.

13. In Paragraph 12, The above chemical cleaning step is, A step of supplying the above pretreatment aqueous solution to a pretreatment reactor to which the above first washing water is supplied; A step of forming the chemical cleaning product by reacting the first washing water with the pretreatment aqueous solution in the above pretreatment reactor; A step of recovering the pretreatment aqueous solution that reacted with the first washing water from the pretreatment reactor; and The step of purifying the recovered pretreatment aqueous solution in a purification system and supplying it back to the pretreatment reactor; Method for providing polyester film resource recycling value chain solutions.

14. In Paragraph 13, The purity of the pretreatment aqueous solution purified in the purification system is measured, and the pretreatment aqueous solution having a purity greater than or equal to a predetermined value is supplied to the pretreatment reactor, and the pretreatment aqueous solution having a purity less than a predetermined value is supplied back to the purification system. Method for providing polyester film resource recycling value chain solutions.

15. In Paragraph 5, Further comprising a crushing step for crushing the waste polyester film prior to the first washing step. Method for providing polyester film resource recycling value chain solutions.

16. In Paragraph 5, Further comprising, prior to the recovery step, a specific gravity separation step for separating the polyester component from the second rinse water using a difference in specific gravity. Method for providing polyester film resource recycling value chain solutions.

17. In Paragraph 16, In the above specific gravity separation step, heterogeneous plastic components having a specific gravity different from that of the polyester component are each separated and recovered individually. Method for providing polyester film resource recycling value chain solutions.

18. In Paragraph 16, The above specific gravity separation step is performed in a separate device or process after the above second washing step. Method for providing polyester film resource recycling value chain solutions.

19. In Paragraph 5, The method further comprises the step of obtaining a recycled component by recycling the recovered polyester component by a physical or chemical method. Method for providing polyester film resource recycling value chain solutions.

20. A computer-readable recording medium on which a computer program is stored, The above computer program is executed by a processor, Instructions for causing the processor to perform a method for providing a polyester film resource recycling value chain solution according to any one of claims 1 to 19. A computer-readable recording medium in which a computer program is stored.

21. A memory portion in which an application program including instructions is stored; and A processor unit that executes the above command, loads the above application, and performs a method for providing a solution capable of supporting a resource circulation value chain that produces resource circulation products through recycling treatment of waste polyester film; A waste classification unit that classifies objects for a closed loop in which, under the control of the above-described processor unit, the resource recycling product is produced identically or similarly to the original waste through the recycling treatment for the waste polyester film, and at least a portion of the resource recycling product is recirculated as waste for the recycling treatment; and A recycling processing unit comprising, under the control of the processor unit, a waste polyester film classified as a closed-loop target, which, through the recycling treatment, provides at least a portion as a chemically recycled raw material for input into the production process of the resource-circulating product. Waste treatment device.

22. In Paragraph 21, The processor unit obtains information regarding the waste polyester film and resource circulation tracking information from digital proof information corresponding to the waste polyester film, and controls the waste classification unit to classify the object for the closed loop based on the information obtained from the digital proof information. Waste treatment device.

23. Waste treatment device of Article 21; A product manufacturing device that produces a resource-circulating product using the chemically recycled raw materials provided from the waste treatment device; and A waste collection device that collects at least some of the waste from the above resource recycling products and provides it to the waste treatment device; The waste treatment device, the product production device, and the waste collection device support a closed loop in which a polyester film is transformed into a resource-recycling product through the chemically recycled raw material, and at least a portion of the transformed resource-recycling product is collected and provided to the waste classification as waste polyester film. Resource recycling processing system.

24. A computer program stored on a computer-readable recording medium, The above computer program is executed by a processor, Instructions for causing the processor to perform a method for providing a polyester film resource recycling value chain solution according to any one of claims 1 to 19. A computer program stored on a computer-readable recording medium.

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