Method and apparatus for producing biaxially oriented polyester film from RPET

Abstract

This disclosure relates to a method for producing biaxially oriented polyester (BOPET) film from polyethylene terephthalate (RPET) granules. The method of the present invention enables the production of monolayer or multilayer biaxially oriented polyester films with uniform thickness. The RPET film product has qualities similar to those of virgin PET film. The BOPET film of the present disclosure meets the requirements of various food packaging compliances / standards. The biaxially oriented polyester film has good elongation, mechanical, and thermal properties, making it useful in high-end food and pharmaceutical packaging and industrial applications. This disclosure also relates to an apparatus for producing biaxially oriented polyester film from PCR polyethylene terephthalate (RPET) granules. Producing RPET film from post-consumer PET waste offers various environmental and cost benefits compared to virgin / virgin PET film.

Description

[Technical Field]

[0001] The present disclosure relates to a method for producing a biaxially oriented polyester (BOPET) film from recycled polyethylene terephthalate (RPET). In particular, the present disclosure relates to RPET granules produced by depolymerization of polyethylene terephthalate (PET) bottle flakes, amorphous PET (A-PET), crystalline PET (C-PET), polyester films, and post-consumer recycled PET (PCR PET). The method of the present invention is capable of producing single-layer or multi-layer biaxially oriented polyester films having uniform thickness, quality, and properties similar to those of virgin PET films. The present disclosure also relates to an apparatus for producing a biaxially oriented polyester film from post-consumer recycled polyethylene terephthalate (RPET). [Background Art]

[0002] Polyethylene terephthalate (PET) products are widely used as beverage bottles, films, laminates, straps, high-grade sheets, fibers, and the like, as well as in medical supplies, particularly syringes and containers. BOPET is a polyester film made of polyethylene terephthalate (PET). BOPET is used due to its properties of high tensile strength, chemical and dimensional stability, transparency, reflectivity, gas and aroma barrier properties, and electrical insulation.

[0003] Current commercially adopted methods allow the use of recycled (PCR) PET only in low-end applications. On the other hand, when higher quality processing is required, such as in the manufacture of biaxially oriented polyester films, recycling is limited by productivity and quality issues. PET products are widely used in beverage bottles, high-grade sheets and fibers, and medical supplies, particularly syringes and containers. Attempts have been made to incorporate recycled materials as much as possible, but these have been impractical due to the inability to completely decompose residual impurities in the product. Currently, commercially adopted methods allow the use of recycled PET only in low-grade applications.

[0004] BOPET film has applications in a variety of fields, including flexible packaging and food contact applications, insulating materials, printing media, electronics, and acoustics.

[0005] BOPET is used in flexible packaging and food applications as a laminate containing metallized BOPET film. White BOPET web substrates are used as lids for dairy products, while transparent BOPET web substrates are used as lids for oven bags of non-frozen or frozen cooked foods, as well as in laminated metal (aluminum or steel), BOPET sheets, straps, and films used in the manufacture of metallized films and cans.

[0006] One of the main requirements for packaging materials in food packaging applications is that they must comply with food packaging compliance / standards. One of the main issues is that the migration of chemicals and contaminants / foreign particles from the packaging material to the food should never occur. The BOPET film of the present invention, manufactured as designed, does not migrate chemicals and contaminants / foreign particles, and this allows the BOPET film of the present invention to meet the requirements of various food packaging compliance / standards. If the migration of chemicals and contaminants / foreign particles occurs, BOPET does not comply with food compliance / standards. Brand owners and customers are increasingly recognizing the urgency of recycling PET into food-grade packaging.

[0007] Current technology uses very large amounts of virgin PET polymer and very small amounts of recycled PET to achieve desired food compliance / standards. Current BOPET (food-grade PET) overcomes the transition problem by increasing the amount of virgin PET polymer used. Attempts have been made to incorporate recycled process materials as much as possible, but so far these have been unusable because it is impossible to completely break down residual impurities in the product.

[0008] A problem with the current technology is the limited use of recycled PET. Therefore, the current method is not environmentally friendly. Secondly, the current technology requires the use of virgin polymers, which means extra raw materials are needed.

[0009] For the manufacture of biaxially oriented polyester, U.S. Patent No. 4,571,363 is referenced. However, this document requires at least 30% to 95% by mass of new polyester. Therefore, a large amount of new or virgin polyester is required to obtain the final biaxially oriented polyester. This has an environmental impact and is very expensive.

[0010] International Publication No. 2001019694A1 is further referenced for the use of polyester-based low-melting-point sealant layers in food packaging. The packaging material has a complete layer made of virgin polyester that comes into contact with the food. This document calls for a food-contacting layer made of new polyester. Therefore, there is a need to develop methods that can use recycled polyester to the greatest extent possible and reduce the use of virgin polyester in BOPET films.

[0011] Considering the above, the inventors of this disclosure felt the need to develop a cost-effective method that overcomes all the problems of the prior art. In particular, there was a need to increase the amount of recycled PET in the reaction mixture and reduce virgin PET to produce BOPET that meets food safety standards. The method of the present invention not only brings economic benefits but also addresses environmental aspects. This disclosure overcomes the problems of the current art by the method and apparatus described in the claims. The BOPET of this disclosure can be produced even from RPET granules of up to 90% and meets food compliance / standards. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] U.S. Patent No. 4571363 [Patent Document 2] International Publication No. 2001019694A1 [Overview of the project] [Problems that the invention aims to solve]

[0013] The inventors' objective is to manufacture a biaxially oriented polyester film for food and pharmaceutical packaging standards that contains as much recycled PET granules (RPET) as possible, up to 90%.

[0014] Another objective of the present invention is to produce a biaxially oriented polyester film applicable to industrial uses, having up to 100% RPET granules. Furthermore, the present invention leads to the recycling and upcycling of used plastic waste.

[0015] For another purpose, the present invention uses PET bottle flakes and PET film together with ethylene glycol (EG), terephthalic acid, and other additives in the esterification process to produce RPET granules.

[0016] For another purpose, the present invention prevents the migration of chemical substances and contaminants / foreign particles on the film surface by filtration and decolorization.

[0017] Another objective of the present invention is to produce food-grade BOPET films from recycled PCR PET with up to 90% efficiency.

[0018] Another objective of the present invention is to increase the recycling of PET in order to reduce its environmental impact.

[0019] Another objective of the present invention is to manufacture BOPET in an environmentally friendly and cost-effective manner.

[0020] Another object of the present invention is to produce a biaxially oriented polyester film applicable to industrial uses, having up to 100% RPET granules.

[0021] Another objective of the present invention is to consume used PET plastic waste.

[0022] Another objective of the present invention is to upcycle used plastic waste.

[0023] A further object of the present invention is to produce RPET granules using PCR PET bottle flakes together with ethylene glycol (EG) and other additives in the depolymerization process.

[0024] Still another object of the present invention is to remove impurities by filtration and perform decolorization by using a clay layer.

[0025] Still another object of the present invention is to prevent migration of chemical substances and impurities / foreign particles on the film surface by means of filtration and decolorization. Means for Solving the Problems

[0026] The present disclosure first discloses a method for producing recycled polyethylene terephthalate (RPET) granules from post-consumer recycled PET (PCR PET) bottle flakes, films, sheets, laminates, amorphous PET (A-PET), crystalline PET (C-PET), polyester films and post-consumer recycled PET (PCR PET), and secondly producing biaxially oriented polyester films using the prepared RPET granules. Impurities derived from the granules are removed by a filtration method, and decolorization of the granules is performed by a clay layer. The method minimizes the generation of waste and / or utilizes waste in the process. The method of the present invention enables production of single-layer or multi-layer biaxially oriented polyester films having a uniform thickness. RPET film products have the same quality as virgin PET films. The BOPET film of the present disclosure meets the requirements of various food packaging compliance / standards such as those of FDA and EFS.

[0027] The present disclosure also relates to an apparatus for producing a biaxially oriented polyester film from recycled polyethylene terephthalate (RPET) granules. Furthermore, the present disclosure leads to recycling and upcycling of used PET plastic waste. Brief Description of the Drawings

[0028] [Figure 1] It is a diagram showing a flowchart of the method according to the present invention. Mode for Carrying Out the Invention

[0029] The drawings mentioned in this explanation should not be understood as being drawn to an accurate scale unless otherwise specified; such drawings are simply illustrative in nature.

[0030] While the present invention is open to various modifications and alternative embodiments, one embodiment is shown in the drawings as an example and described below herein. However, it should be understood that the present invention is not intended to be limited to any particular embodiment disclosed, but rather encompasses all modifications, equivalents, and alternatives that fall within the spirit and scope of the invention.

[0031] The terms “includes,” “contains,” or any other variations thereof, are intended to encompass non-exclusive inclusions, so that a configuration, structure, or method containing a list of components or processes may include not only those components or processes, but also other components or processes not expressly described or specific to such apparatus, structure, or method. In other words, one or more elements in a system or apparatus following the word “includes” do not, without further constraint, exclude the existence of other or further elements in the system or apparatus.

[0032] To better understand the present invention, we will refer here to the embodiments shown in the accompanying figures and in the following description of this specification.

[0033] Furthermore, it should be understood that the present invention is not limited to the structural or process details shown in the following description. Other embodiments of the present invention are possible and can be implemented or carried out in a variety of ways.

[0034] The expressions "a," "an," and "the," used to define a term, include both the singular and plural forms of that term.

[0035] One embodiment of the present invention is, - Depolymerizing pre-purified PET products by glycolysis to produce monomers. - Polycondensing monomers in a polycondensation reactor or autoclave to produce recycled PET (RPET) granules. A process for preparing recycled polyethylene terephthalate (RPET) granules, including, - By optional means, RPET granules are loaded into the extruder along with virgin PET granules to obtain molten polyethylene terephthalate. - Extruding molten polyethylene terephthalate through a die, - Extruded polyethylene terephthalate is rapidly cooled on a cooled roller and stretched to obtain a biaxially oriented polyethylene terephthalate film. A process for preparing a biaxially oriented polyethylene terephthalate film, including the process of preparing a biaxially oriented polyethylene terephthalate film. A method for preparing a biaxially oriented polyethylene terephthalate (BOPET) film, comprising: The glycolysis reaction is carried out in an esterification reactor by adding glycol at a temperature of 245-255°C and a pressure of 0.5-1 bar, and RPET granules constitute up to 100% of the mixture of RPET granules and virgin PET granules charged into the extruder. This relates to a method characterized by the following.

[0036] Another embodiment of the present invention relates to a method for which the resulting biaxially oriented polyethylene terephthalate has at least three layers.

[0037] A further embodiment of the present invention relates to a method wherein the biaxially oriented polyethylene terephthalate has an A / B / A or A / B / C configuration, wherein the B layer comprises a biaxially oriented polyethylene terephthalate film made of recycled PET (RPET), and the cap layers A and / or C comprises a biaxially oriented polyethylene terephthalate film made of virgin PET granules together with an inorganic filler.

[0038] Yet another embodiment of the present invention relates to a method in which the film preparation step includes up to 95% recycled PET granules.

[0039] Yet another embodiment of the present invention relates to a method in which the film preparation step includes up to 90% recycled PET granules.

[0040] Yet another embodiment of the present invention is a step of pre-cleaning a PET product, - Perform the initial washing of the PET product with a solvent to remove contaminants and non-PET. material For example, a process to remove polypropylene, polyethylene, polyvinyl chloride, etc. - A step of brushing off the washed PET product to remove dirt and undesirable substances, - In order to remove stones and obtain a clean PET product, the process involves removing stones from the PET product. This includes methods.

[0041] Yet another embodiment of the present invention relates to a method comprising the steps of preparing recycled polyethylene terephthalate (RPET), followed by filtration and decolorization for the removal of foreign particles before the film preparation step.

[0042] A further embodiment of the present invention relates to a method for selecting a PET product from one or more films, sheets, laminates, bottles and flakes, amorphous PET (A-PET), crystalline PET (C-PET), polyester films, and used recycled PET (PCR PET).

[0043] Yet another embodiment of the present invention relates to a method in which the autoclave temperature is 275-295°C and the batch time is 3-4 hours.

[0044] Yet another embodiment of the present invention relates to a method in which an autoclave reactor is maintained under vacuum and a catalyst is added.

[0045] In yet another embodiment of the present invention, stretching is - Extension in the flow direction with an extension ratio of 3 to 3.5, and - Lateral stretching with a stretch ratio of 3.8 to 4.2 This includes methods.

[0046] Yet another embodiment of the present invention relates to a method for adding an additive to an autoclave reactor.

[0047] Yet another embodiment of the present invention relates to a method in which biaxially oriented polyethylene terephthalate (BOPET) is a food-grade packaging film or a pharmaceutical packaging film.

[0048] Another embodiment of the present invention is, - A purification device for pre-cleaning PET products to be recycled, - An esterification reactor for converting pre-purified PET products into monomers, - An autoclave reactor operated at a temperature of 275-295°C and a vacuum pressure for polycondensing monomers to obtain recycled PET granules, - An extruder for obtaining molten polyethylene terephthalate (PET) by extruding recycled PET granules and, optionally, virgin PET granules, - A cooled roller for rapidly cooling and stretching molten PET to obtain biaxially oriented polyethylene terephthalate Apparatus for manufacturing biaxially oriented polyethylene terephthalate (BOPET) film, including The esterification reactor includes a glycolysis reaction by adding glycol at a temperature of 245-255°C and a pressure of 0.5-1 bar. RPET granules must constitute up to 100% of the mixture of RPET and virgin PET charged into the extruder. This relates to an apparatus characterized by the following.

[0049] Yet another embodiment of the present invention is a cleaning device in which - From PET flakes, contaminants and non-PET material For example, a preliminary purifier for cleaning and removing polypropylene, polyethylene, polyvinyl chloride, etc. - A brushing removal device for removing dirt and undesirable substances, - A stone removal device for removing stones and obtaining clean PET products, - Magnetic separator for removing iron and other metal particles Regarding devices, including those mentioned above.

[0050] Debris is removed from the RPET granules by filtration and by decolorization using a clay layer. Migration of RPET on the film surface is prevented by filtration and decolorization.

[0051] Using recycled PET instead of virgin / new resin has environmental impact and carbon footprint benefits.

[0052] This disclosure relates to a method for producing biaxially oriented polyester (BOPET) film from recycled polyethylene terephthalate (RPET) granules. In particular, this disclosure relates to PET bottle flakes / granules and RPET granules produced by the depolymerization of PET film. BOPET is produced using RPET as a raw material. The BOPET film of the present invention has recycled PET granules (RPET). RPET may make up to 90% of the BOPET for food and pharmaceutical packaging applications, and up to 100% RPET granules can be applied for industrial applications such as insulation.

[0053] The BOPET film of this disclosure overcomes the problems of migration onto the film surface and migration of the manufactured film, applicable to food packaging applications, and is manufactured from up to 90% RPET granules. RPET granules are manufactured by depolymerizing flakes to monomers in an esterification-glycolysis method in the presence of ethylene glycol, and granules are produced after polycondensation. Furthermore, the properties of the granules are improved by filtration and decolorization to prevent migration of chemicals and contaminants / foreign particles.

[0054] To obtain a transparent polyester film, the molten polyester is extruded through a die and rapidly cooled on a cooled roller.

[0055] PET bottle flakes, supplied to the esterification reactor through a supply tank, are depolymerized under heating and in the presence of ethylene glycol (EG) to form a 100% monomer batch in the reactor. Polymerization and polycondensation then occur by adding time, pressure, temperature, and additives, resulting in the formation of granules.

[0056] These granules are subjected to filtration to remove impurities and decolorization to improve color.

[0057] Preparation of RPET granules PET bottle flakes collected through the supplier are supplied to the tank via jumbo bags. The flakes then pass through the supply tank and enter an esterification reactor where pressure and temperature are maintained; in other words, the PET bottle flakes are charged into the esterification reactor through the supply tank under heating conditions.

[0058] Purified terephthalic acid (PTA) is added to the flakes in the esterification reactor. The reactor has a stirrer that operates at high RPM during the process. The process conditions for the esterification reactor are disclosed in Table 1. This reaction causes depolymerization of the PET bottle flakes, producing a 100% monomer batch in the reactor. From the esterification reactor, the batch (monomers) is moved to an autoclave reactor, where a polycondensation reaction takes place. The autoclave reactor is maintained under vacuum, and additives are added. Under stirring by the stirrer, the additives are added to the autoclave to prevent the molten material from turning yellow. As the polycondensation reaction progresses, the RPM of the stirrer is reduced, and the autoclave is pressurized with nitrogen to remove the polymer molten material. The polymer molten material (RPET) is sent to the cutting and drying processes. The RPET granules thus obtained were tested for various properties, namely ash content, IV, end groups, and haze, and were found to be comparable to virgin PET.

[0059] [Table 1]

[0060] [Table 2]

[0061] Filtration and decolorization In this method, filters are used to remove any impurities, ensuring consistently high-quality RPET granules. This improved granule quality and increased productivity.

[0062] Clay is widely used in the production of RPET granules for decolorization purposes. Clay is used in granular form in fixed-bed adsorbents. RPET granules pass through the clay of the fixed-bed adsorbent, which absorbs colorants from the RPET granules. Due to the surface area and good porosity of the clay material, they become useful adsorbents. The clay used in this method is a mineral clay such as bentonite, which has a good surface area and porosity.

[0063] Preparation of BOPET film This disclosure relates to a method for preparing a biaxially oriented polyester film, the method comprising the steps of: loading manufactured RPET granules into a main extruder and virgin granules into a sub-extruder to obtain molten polyester; and extruding, rapidly cooling, and stretching the film to obtain a BOPET film. The film comprises a three-layer structure (e.g., A / B / A or A / B / C). One and / or two layers of the film contain silica.

[0064] Biaxially oriented polyester films include multilayer structures such as A / B / A and / or A / B / C, in which the B layer (core layer) constitutes the polyethylene terephthalate layer of the film and contains recycled PET (RPET), and the cap layers (A and / or C) constitute the polyethylene terephthalate layer of the film and contain virgin PET granules containing inorganic fillers.

[0065] In this disclosure, the RPET is used to manufacture films that are applicable to food and pharmaceutical packaging applications, even if they have a maximum RPET content of 90% or up to 100%.

[0066] The biaxially oriented polyester film disclosed in this invention is made using 100% RPET granules, meaning that not only the core layer but also the cap layer is made of RPET granules applicable to industrial applications.

[0067] [Table 3]

[0068] In one embodiment of the present invention, the film comprises a three-layer structure (e.g., A / B / A or A / B / C). One and / or two layers of the film contain silica.

[0069] Biaxially oriented polyester films include multilayer structures such as A / B / A and / or A / B / C, in which the B layer (core layer) constitutes the polyethylene terephthalate layer of the film and contains recycled PET (RPET), and the cap layers (A and / or C) constitute the polyethylene terephthalate layer of the film and contain virgin PET granules containing inorganic fillers.

[0070] In this invention, up to 90% RPET is used to produce films applicable to food and pharmaceutical packaging applications.

[0071] The biaxially oriented polyester film disclosed in this invention is made using 100% RPET granules, meaning that not only the core layer but also the cap layer is made of RPET granules applicable to industrial applications.

[0072] Environmental benefits of RPET manufacturing The production of RPET film from used PET waste offers various environmental benefits compared to virgin PET film. It reduces the carbon footprint, lowers energy consumption in film production, and reduces the use of fossil fuels. It has life cycle analysis (LCA) advantages over virgin PET film, reducing CO2 emissions by 1.5 tons per ton of recycled plastic bottles compared to landfill or incineration. It also reduces greenhouse gas (GHG) emissions and energy use compared to virgin PET film. Soil and marine pollution are also reduced.

[0073] The aforementioned biaxially oriented polyester film has good elongation, mechanical and thermal properties, and is useful in high-end food and pharmaceutical packaging as well as industrial applications.

[0074] The present invention itself, along with further features and associated advantages, will become apparent from the following detailed description in conjunction with the accompanying drawings. One or more embodiments of the present invention are described here by example. [Examples]

[0075] (Example 1) Various batches of RPET produced by the method disclosed herein are analyzed for properties such as IV, COOH, ash content, and DEG. The properties of RPET are comparable to those of virgin PET. Therefore, RPET up to 90% can be used to produce films applicable to food or pharmaceutical packaging applications.

[0076] [Table 4]

[0077] (Example 2) Comparison of the properties of virgin PET film and RPET film This study compares biaxially oriented PET film (including recycled PET) produced by the method of the present invention with biaxially oriented PET film produced from virgin PET. The mechanical properties of the RPET film, such as tensile strength and elongation at break, are similar to those of the virgin PET film. Similarly, its optical properties, surface properties, and performance are comparable to those of the virgin PET film. The results are summarized in the table below.

[0078] [Table 5]

[0079] The mechanical properties of RPET film, such as tensile strength and elongation at break, are the same as those of virgin PET film. Similarly, its optical properties, surface properties, and performance are comparable to those of virgin PET film. Therefore, the method of the present invention can produce food-grade biaxially oriented PET using up to 90% RPET.

[0080] advantage The BOPET disclosed in this disclosure offers the following advantages: - The BOPET film described herein meets the requirements of various food packaging compliance / standards, including those of the Food and Drug Administration (FDA) and the European Food Safety Authority (EFSA). - Up to 100% RPET can be used in film manufacturing. - There are no issues with the migration of impurities / dust from the film surface. - Impurities are removed by filtration, and the clay layer is used for decolorization. - Use more recycled PET and less virgin PET, or no virgin PET at all. - Environmentally friendly. - It is an economical method.

Claims

1. A method for preparing a biaxially oriented polyethylene terephthalate (BOPET) film, - Depolymerizing pre-purified PET products by glycolysis to produce monomers, and, - Polycondensing monomers in a polycondensation reactor or autoclave to produce recycled PET (RPET) granules. A process for preparing recycled polyethylene terephthalate (RPET) granules, including, - RPET granules are loaded into an extruder along with virgin PET granules to obtain molten polyethylene terephthalate. - Extruding molten polyethylene terephthalate through a die, and, - Extruded polyethylene terephthalate is rapidly cooled on a cooled roller and stretched to obtain a biaxially oriented polyethylene terephthalate film. A process for preparing a biaxially oriented polyethylene terephthalate film, including the process of preparing a biaxially oriented polyethylene terephthalate film. Includes, The glycolysis reaction is carried out in an esterification reactor by adding ethylene glycol and purified terephthalic acid (PTA) at a temperature of 245–255°C and a pressure of 0.5–1 bar, and RPET granules must make up to 100% of the mixture of RPET granules and virgin PET granules charged into the extruder. A method characterized by the following.

2. The method according to claim 1, wherein the resulting biaxially oriented polyethylene terephthalate has at least three layers.

3. The biaxially oriented polyethylene terephthalate has an A / B / A configuration or an A / B / C configuration. Layer B consists of a biaxially oriented polyethylene terephthalate film made from recycled PET (RPET). The cap layers A and / or C consist of a biaxially oriented polyethylene terephthalate film made of virgin PET granules together with an inorganic filler. The method according to claim 1 or 2.

4. The method according to claim 1, wherein the film preparation step includes up to 95% recycled PET granules.

5. The method according to claim 1 or 4, wherein the film preparation step includes up to 90% recycled PET granules.

6. The process of pre-cleaning PET products is - A step of performing an initial wash of the PET product with a solvent to remove contaminants, non-PET materials such as polypropylene, polyethylene, and polyvinyl chloride, - Brushing and removal process of washed PET products for the removal of dirt and undesirable substances, - A stone removal process for PET products to remove stones and obtain clean PET products. The method according to claim 1, including the method described in claim 1.

7. The method according to any one of claims 1 to 6, wherein, following a step of preparing recycled polyethylene terephthalate (RPET), filtration and decolorization for the removal of foreign particles are performed, and then a film preparation step is carried out.

8. The method according to claim 1, wherein the PET product is selected from one or more films, sheets, laminates, bottles and flakes, amorphous PET (A-PET), crystalline PET (C-PET), polyester films, and used recycled PET (PCR PET).

9. The method according to any one of claims 1 to 8, wherein the autoclave temperature is 275 to 295°C and the batch time is 3 to 4 hours.

10. The method according to claim 1, 8, or 9, wherein the autoclave reactor is maintained under vacuum and the catalyst is added.

11. The extension - Extension in the flow direction with an extension ratio of 3 to 3.5, and - Lateral stretching with an elongation ratio of 3.8 to 4.2 The method according to claim 1, including the method described in claim 1.

12. The method according to claim 1, 8, 10, or 11, wherein an additive is added to the autoclave reactor.

13. The method according to any one of claims 1 to 11, wherein the biaxially oriented polyethylene terephthalate (BOPET) is a food-grade packaging film or a pharmaceutical packaging film.

14. Apparatus for manufacturing biaxially oriented polyethylene terephthalate (BOPET) film, - A purification device for pre-cleaning PET products to be recycled, - An esterification reactor for converting pre-purified PET products into monomers, - An autoclave reactor operated at a temperature of 275-295°C and a vacuum pressure for polycondensing monomers to obtain recycled PET granules, - An extruder for obtaining molten polyethylene terephthalate (PET) by extruding recycled PET granules and optionally selected virgin PET granules, - A cooled roller for rapidly cooling and stretching molten PET to obtain biaxially oriented polyethylene terephthalate. Includes, The esterification reactor is involved in the glycolysis reaction by adding ethylene glycol and purified terephthalic acid (PTA) at a temperature of 245–255°C and a pressure of 0.5–1 bar, and RPET granules must be present in up to 100% of the mixture of RPET and virgin PET charged into the extruder. A device characterized by the following.

15. The aforementioned purification device - A preliminary purifier for washing and removing contaminants and non-PET materials, such as polypropylene, polyethylene, and polyvinyl chloride, from PET flakes. - A brushing removal device for removing dirt and undesirable substances, - A stone removal device for removing stones and obtaining clean PET products, - Magnetic separator for removing iron and other metal particles The apparatus according to claim 14, including the apparatus described in claim 14.

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