Method for preparing recycled material by using waste nylon

Abstract

The present invention relates to a method for preparing recycled material by using waste nylon, the method being capable of removing a coating layer from a silicone-coated waste nylon material and manufacturing plastic pellets for reuse so that recycled material can be prepared using waste nylon. The method for preparing recycled material by using waste nylon, according to the present invention, comprises: a waste nylon raw material receiving step of cutting or crushing, in a predetermined size, waste nylon raw material, which is formed from a nylon fiber having a coating layer formed thereon or a fabric manufactured using same, and supplying same; a coating layer peeling step of peeling off the coating layer remaining on the surface of the waste nylon raw material, so as to form treated waste nylon material; and a recycled pellet manufacturing step of melt-extruding the treated waste nylon material so as to form recycled pellets, thereby enabling the treated waste nylon material to be used as recycled raw material.

Description

Method for manufacturing recycled materials using waste nylon

[0001] The present invention relates to a method for manufacturing a recycled material using waste nylon, and more specifically, to a method for manufacturing a recycled material using waste nylon in which a coating layer of a silicone-coated waste nylon material is removed to produce plastic pellets for reuse, thereby enabling the production of a recycled material using waste nylon.

[0002] As plastic pollution emerges as a serious global issue, the recycling of plastic waste is becoming a critical environmental challenge. Nylon is a high-performance polyamide material with high strength, durability, and heat resistance that is widely used in various industrial sectors; however, the treatment and recycling of its waste remain challenging issues.

[0003] Although various methods for treating such waste have been researched and developed, in reality, most are disposed of through methods such as landfilling or incineration, and are recycled only in some high-value-added sectors.

[0004] Nylon, used in applications such as discarded fishing nets and automotive parts, is a raw material with many uses due to its ease of processing and significant economic advantages; however, there have traditionally been many difficulties in disposing of used nylon waste. In most cases, nylon waste was disposed of through landfill or incineration. However, incinerating nylon materials carries a high risk of generating large amounts of harmful organic gases due to incomplete combustion, and discarded fishing nets contain high levels of Cl, the main component of salt, which can lead to the formation of dioxins through the reaction of chlorine with unburned components during combustion.

[0005] Furthermore, waste nylon does not biologically decompose even when landfilled, and in the case of waste such as discarded fishing nets, the high salt content can lead to additional problems such as soil and groundwater contamination during landfilling.

[0006] Therefore, it is most desirable to process waste nylon into recycled materials so that it can be reused; however, in the case of nylon-based products used in items such as automotive airbags, there was a problem where reuse was difficult due to the silicone coating layer on the surface.

[0007] The present invention was created to solve the above problems, and aims to provide a method for manufacturing a recycled material using waste nylon that can be processed into a reusable recycled material by removing the silicon coating layer coated on the waste nylon.

[0008] A method for manufacturing a recycled material using waste nylon according to the present invention comprises: a waste nylon raw material receiving step in which waste nylon raw material formed from nylon fibers having a coating layer formed thereon or fabrics produced using the same is cut or crushed to a predetermined size and supplied; a coating layer peeling treatment step in which a coating layer remaining on the surface of the waste nylon raw material is peeled off to form a waste nylon treated material; and a recycled pellet manufacturing step in which the waste nylon treated material is melt-extruded to form recycled pellets so that they can be used as recycled raw materials.

[0009] The above coating layer peeling treatment step preferably includes a first peeling process in which waste nylon raw material is fed into a processing container and a drum equipped with a scraper is rotated to scrape off the coating material attached to the surface of the waste nylon raw material; a second peeling process in which the waste nylon raw material that has undergone the first peeling process is immersed in washing water of a predetermined temperature containing a surfactant to loosen the silicone coating layer and then washed; and a drying process in which the waste nylon raw material that has undergone the second peeling process is dried.

[0010] The above coating layer peeling treatment step preferably further includes a third peeling process in which the waste nylon raw material that has undergone the above second peeling process is removed from the washing water and, before proceeding to the above drying process, mechanical impact is applied to remove the remaining coating material.

[0011] The above-mentioned phenyl nylon may be either polyamide 6 (PA6) or polyamide 66 (PA66).

[0012] The above waste nylon raw material is waste fishing net, and the above waste nylon raw material receiving step may include a waste nylon raw material washing process to remove foreign substances and salts remaining in the above waste nylon raw material.

[0013] According to the method for manufacturing recycled materials using waste nylon of the present invention, by processing waste nylon materials generated in automobiles, electronic devices, and other industries into reusable recycled materials, there is an advantage of preventing environmental pollution caused by waste nylon and increasing the added value of waste resources to provide competitive recycled raw materials.

[0014] FIG. 1 is a conceptual diagram of a method for manufacturing a recycled material using waste nylon according to the present invention.

[0015] FIG. 2 is a process flow diagram of a method for manufacturing a recycled material using waste nylon according to the present invention.

[0016] Figure 3 is a flowchart showing each step of the method for manufacturing recycled materials using waste nylon of Figure 2 in more detail.

[0017] Hereinafter, a method for manufacturing a recycled material using waste nylon according to an embodiment of the present invention will be described in detail with reference to the attached drawings. As the present invention is susceptible to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Similar reference numerals have been used for similar components in the description of each drawing. In the attached drawings, the dimensions of the structures are depicted enlarged from their actual size for the sake of clarity of the present invention.

[0018] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0019] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0020] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0021]

[0022] The method for manufacturing a recycled material using waste nylon according to the present invention will be described in more detail below with reference to the attached drawings.

[0023] FIG. 1 is a conceptual diagram showing the process of manufacturing a recycled material using waste nylon according to the method for manufacturing a recycled material using waste nylon according to the present invention, FIG. 2 is a flowchart showing each step of the method for manufacturing a recycled material using waste nylon, and FIG. 3 is a flowchart showing each step of the method for manufacturing a recycled material using waste nylon of FIG. 2 in more detail.

[0024] Referring to the drawings, the method for manufacturing a recycled material using waste nylon according to the present invention includes a waste nylon raw material receiving step (S-001), a coating layer peeling treatment step (S-002), and a recycled pellet manufacturing step (S-003).

[0025] The above waste nylon raw material receiving step (S-001) is a step for procuring raw materials, namely waste nylon, for manufacturing recycled materials and supplying them to a subsequent process.

[0026] Waste nylon raw materials are formed from nylon fibers or fabrics made using them, and can be applied to waste fishing nets or airbags used in automobiles.

[0027] Nylon fibers often feature a silicone coating layer on their surface. In the case of discarded fishing nets, a coating layer is formed on the surface to allow them to remain submerged in seawater for extended periods, and for airbags, a coating layer is formed on the surface to ensure a seal and prevent internal gas from leaking out. As mentioned above, silicone coatings are frequently applied to these coating layers.

[0028] The waste nylon raw material receiving stage (S-001) includes a process of cutting or crushing the waste nylon raw material into a predetermined size so that it can be fed into a subsequent process, i.e., a waste nylon raw material cutting process (S-0012).

[0029] In addition, the above waste nylon raw material receiving step (S-001) may further include a waste nylon raw material washing process (S-0011) for washing the raw material. In this process, a washing process may be additionally performed to remove foreign substances (e.g., salt, soil, dust, etc.) contained in the raw material before it is fed into the processing device. In particular, since raw materials such as waste fishing nets are often recovered from the marine environment and may contain salt, residual salt is removed through the washing process to prevent damage in subsequent processes. The washed waste nylon raw material is prepared in a state optimized for coating layer peeling treatment.

[0030] When the waste nylon raw material to be recycled is supplied after being washed and cut / crushed in the above waste nylon raw material receiving step (S-001), a coating layer peeling treatment step (S-002) is performed to remove the silicone coating layer remaining on the surface.

[0031] This step includes a first peeling process (S-0021) for scraping off a silicone coating layer from the surface of the waste nylon raw material, a second peeling process (S-0022) for washing to remove the coating layer by immersing in washing water, a third peeling process (S-0023) for removing the coating layer by striking the waste nylon raw material, and a drying process (S-0024) for drying the waste nylon raw material.

[0032] The first peeling process (S-0021) is a process of introducing waste nylon raw material that has been washed and cut into a scraping device (10) as shown in FIG. 1 and scraping off the coating layer on the surface.

[0033] The above-mentioned splicing device includes a processing housing (11) into which waste nylon raw material is fed, and a scraper (12) that rotates inside the processing housing (11).

[0034] After waste nylon raw material is fed into the processing unit (11), a scraper (12), formed in the shape of a cylindrical rotating body, operates to scrape the surface of the nylon raw material and physically remove the coating layer. The scraper (12) rotates at a constant speed and serves to peel off the coating layer through the frictional force applied to the waste nylon raw material.

[0035] The scraper (12) is formed to include a cylindrical drum that rotates by a motor and a plurality of protrusions protruding outwardly from the surface of the drum, and the coating layer and waste nylon are separated as the protrusions repeatedly scrape off the coating layer formed on the surface of the waste nylon raw material.

[0036] The peeled coating layer is transported to the outside of the processing unit (11) and can be formed to be collected in a collector (14) provided on the outside of the processing unit (11) by riding on the air moving from the inside to the outside of the processing unit (11) by a blower (13).

[0037] The above second peeling process (S-0022) is a process of removing the coating layer secondarily from the waste nylon raw material that has undergone the first peeling process (S-0021).

[0038] If the waste nylon raw material that has undergone the first peeling process (S-0021) is referred to as the primary treatment raw material, the primary treatment raw material is introduced into a washing tank (20) filled with washing water for the second peeling process (S-0022).

[0039] The washing water filled in the washing tank (20) contains a surfactant, and when the primary treatment raw material is impregnated in the washing water within the washing tank (20) and undergoes a predetermined period of time, the coating layer becomes soft due to the surfactant, making it easier to separate the coating layer from the nylon material.

[0040] Although not illustrated, the washing tank (20) may further include a temperature control unit capable of heating or cooling the washing water to maintain a constant temperature of the washing water, thereby allowing washing to be performed under constant temperature conditions. In this case, the temperature control unit may be a heat pipe, a Peltier element, or a cooling system using a heating wire and a refrigerant.

[0041] In addition, the washing tank (20) may further include a rotary driving means for stirring the primary treatment material so that the coating layer can be easily peeled off while the primary treatment material is immersed in washing water. A rotary drum capable of holding the primary treatment material may be provided inside the washing tank (20) like a washing machine, so that the primary treatment material may be rotated by the rotation of the rotary drum, or a washing rod may be further provided that protrudes a predetermined length into the internal space of the washing tank (20) and moves the primary treatment material submerged in washing water or collides with the primary treatment material while reciprocating along a straight line or a rotational direction.

[0042] The above third peeling process (S-0023) is a step of removing the remaining coating layer by striking the secondary treatment raw material obtained through the second peeling process (S-0022).

[0043] During the second peeling process, the coating layer of the secondary treatment material is removed by washing water containing a surfactant, but the coating layer that is not removed is also softened so that it becomes easy to separate from the waste nylon. Therefore, during the third peeling process, the secondary treatment material is struck to cause the coating layer to detach from the waste nylon.

[0044] In the case of this embodiment, the structure is illustrated such that a secondary processing raw material is struck by a striking member (30) that moves up and down, and the size and shape of the striking member (30), as well as the number of times or intensity of the striking, can be set in various ways as needed.

[0045] And although not shown, the support member supporting the secondary processing raw material may have a number of collection holes formed therein so that the detached coating layer material can be separated from the waste nylon and collected.

[0046] The above drying process (S-0024) is a step for drying the washing water, etc. used in the second peeling process (S-0022). In this step, the third treatment raw material generated through the third peeling process (S-0023) may be naturally dried, but as illustrated, the third treatment raw material may be introduced into a heating room (40) equipped with a heating wire (41) for rapid drying and quick drying.

[0047] Although not described, moisture remaining on waste nylon can be removed by supplying air through a blower while the tertiary treatment raw material is suspended in the air via a hanger. In this case, the amount of residual coating material can be minimized by causing the coating material remaining on the tertiary treatment raw material to detach and move away due to the airflow from the blower during the drying process.

[0048] The above recycled pellet manufacturing step (S-003) is a step of forming recycled pellets by melting and extruding the waste nylon treated material generated through the above coating layer peeling treatment step (S-002) so that it can be used as a recycled raw material, and includes a waste nylon material melting process (S-0031) and a pellet extrusion process (S-0032).

[0049] The waste nylon processing material is processed into recycled pellets in a pellet molding device (50). The waste nylon processing material is heated to a predetermined temperature in a melter (51) to melt it, and the melted resin is extruded through an extruder (52). During the extrusion molding process, it is cut to have a predetermined length to produce recycled raw materials in the form of pellets having a predetermined diameter and length.

[0050] The size and shape of the above recycled pellets can be varied with consideration for reuse, and the recycled pellets formed in this way can be utilized as raw materials for manufacturing various parts, including automotive parts, that can be manufactured using recycled nylon material.

[0051] The method for manufacturing a recycled material using waste nylon according to the present invention described above can provide a recycled pellet for reuse after efficiently removing the coating layer from waste nylon material containing a coating layer such as a silicone coating layer.

[0052] This enables the more eco-friendly disposal of waste nylon that previously relied on landfill or incineration, maintains the physical properties of products made using recycled pellets, and improves processability, thereby significantly improving the quality and cost of producing products using recycled raw materials.

[0053]

[0054] The description of the presented embodiments is provided so that any person skilled in the art may use or practice the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope of the present invention. Thus, the present invention is not limited to the embodiments presented herein, but should be interpreted in the broadest possible scope consistent with the principles and novel features presented herein.

Claims

1. A waste nylon raw material receiving step in which waste nylon raw material formed from nylon fibers on which a coating layer is formed or fabrics produced using such fibers is cut or crushed to a predetermined size and supplied; A coating layer peeling treatment step for forming a waste nylon treatment material by peeling off the coating layer remaining on the surface of the above-mentioned waste nylon raw material; A recycled pellet manufacturing step comprising melt-extruding the above-mentioned waste nylon treatment material to form recycled pellets so that they can be used as recycled raw materials. Method for manufacturing recycled material using waste nylon.

2. In Claim 1, The above coating layer peeling treatment step comprises a first peeling process in which waste nylon raw material is fed into a treatment container and a drum equipped with a scraper is rotated to scrape off the coating material attached to the surface of the waste nylon raw material, and A second peeling process in which the waste nylon raw material that has undergone the first peeling process is immersed in washing water of a predetermined temperature containing a surfactant to loosen the silicone coating layer and then washed, and Characterized by including a drying process for drying the waste nylon raw material that has undergone the above-mentioned second peeling process. Method for manufacturing recycled material using waste nylon.

3. In Claim 2, The above coating layer peeling treatment step is A third peeling process further comprising removing the waste nylon raw material that has undergone the second peeling process from the washing water and applying mechanical impact to remove the remaining coating material before proceeding to the drying process. Method for manufacturing recycled material using waste nylon.

4. In any one of claims 1 to 3, The above-mentioned phenyl nylon is characterized as being either polyamide 6 (PA6) or polyamide 66 (PA66). Method for manufacturing recycled material using waste nylon.

5. In Claim 4, The above waste nylon raw material is waste fishing net, and The above waste nylon raw material receiving step is characterized by including a waste nylon raw material washing process to remove foreign substances and salts remaining in the waste nylon raw material. Method for manufacturing recycled material using waste nylon.

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