KR20230046621A - Manufacturing method of eco-friendly recycled polyester elastic composite yarn and yarn and fabric manufactured therefrom - Google Patents

Abstract

The present invention manufactures recycled polyester elastic composite yarns in which eco-friendly recycled polyester partially oriented yarn (POY) is manufactured by performing crystallization drying and dehumidifying drying on recycled polyester flakes under certain temperature conditions and spinning the same, so that polyester partially drawn yarn and recycled polyester latent crimped yarn are twisted together to form air entanglement, thereby having excellent tactile sensation and excellent elasticity. The composite yarn manufactured in this way is an eco-friendly material that recycles discarded resources, and is an elastic composite yarn with excellent volume, lightness, and absorbency, and can be competitive as a clothing fabric.

Description

Manufacturing method of eco-friendly recycled polyester elastic composite yarn and yarn and fabric manufactured therefrom

It is to develop recycled PET materials by recycling waste plastics, and to develop sustainable materials that have functionality and differentiated natural sensibility by utilizing the advantages of elasticity and eco-friendly materials.

Millions of tons to tens of millions of tons of PET plastics flow into the sea every year, and it is said that there are more than 1 million pieces of plastic per 1 ㎢ of the sea. Not only the impact on health, etc., but also the social and economic adverse effects due to pollution are concerned.

In Korea, both incineration and landfill are used to treat waste, but it is impossible to build any more incinerators due to opposition from residents, and the world's largest landfill in the metropolitan area is also destined to be discontinued by 2025. In addition, China, which imported and processed about half of the world's recycling waste, declared to the World Trade Organization (WTO) that it would "restrict the import of plastic waste and electronic waste in order to protect the environment and improve health and hygiene." Rather, 'garbage crises' are taking place all over the world.

Recycled plastic produced from waste plastic can be applied to various fields depending on the ingredients and grade, but so far it is applied to plastic injection products, building reinforcement materials, and packaging bands that require low technology, and fiberization that requires a higher level of technology. and product application is incomplete.

In Korea, large and medium-sized companies (Hyosung, Huvis, etc.) are producing recycled PET fibers for clothing using high-purity PET flakes, and non-woven fabrics for civil engineering and automobiles are being produced mainly by small and medium-sized enterprises.

Latent crimp fibers are heat-shrinkable fibers that are heat-shrinked by applying heat in the spinning or drawing process after composite spinning of two types of polymers with different heat-shrinkage characteristics in a side-by-side or sheath-core type. It is a fiber that is physically coiled due to gender difference and has a high degree of elasticity with a principle similar to a spring.

In terms of elasticity, it is inferior to conventional spandex fibers, but as a disadvantage of spandex, latent crimp fibers that are excellent in alkali resistance and shape stability and are easy to dye and post-process are widely used.

By complex processing these latent crimp yarns and other types of recycled polyester yarns, it is possible to manufacture complex yarns that meet the needs of more diverse consumers.

In addition, recycled polyester (Recycled PET) used in the present invention is material recycling, which regenerates raw materials by refining raw materials from waste materials or waste materials recovered from previously used products during the polyester manufacturing process, and then melts and spins to reproduce them. It can be divided into chemical recycling, which manufactures yarn by refining, depolymerizing, then repolymerizing and melt spinning.

Material recycling can relatively easily recycle raw materials, but if it is difficult to control the purity and degree of polymerization of materials, it is difficult to obtain polymers with uniform physical properties, which may limit the expansion of end-use applications. Since polymer is produced by polymerization, it has the advantage of being able to produce excellent yarn with little difference in physical properties from yarn manufactured from crude oil.

In the present invention, recycled polyester partially oriented yarn (POY) is manufactured by drying and melt-spinning polyester (PET) flakes prepared by collecting waste plastic under appropriately designed conditions, and the polyester partially oriented yarn ( POY) and recycled polyester latent crimp yarn to manufacture eco-friendly recycled polyester stretchable composite yarn.

Prior Document 1: Domestic Application Publication No. 10-2017-0103281 (application published on September 13, 2017) Korean Registration No. 10-1979655 Korean Registration No. 10-1851644

The present invention has been made to solve the above problems, by drying and spinning recycled polyester-based resin to produce recycled polyester partially oriented yarn (POY), and separately manufactured recycled polyester-based latent crimped yarn and ply-twisted yarn. It is intended to manufacture an eco-friendly recycled polyester stretchable composite yarn.

In addition, the manufactured recycled polyester partially oriented yarn (POY) is manufactured by modifying the device so that the yarn is supplied using a separate roll in the composite yarn manufacturing device and stretched using the first roller and the second roller. It aims to drastically reduce the process defects of composite yarn and improve the quality of stretchable composite yarn.

In order to achieve the above object, the present invention includes a recycled polyester partially oriented yarn (POY) preparation step; Recycled polyester latent crimp yarn preparation step; A yarn supply step of supplying recycled polyester partially oriented yarn (POY) and recycled polyester latent crimped yarn through a separate roll; A yarn drawing step of stretching each of the yarns between a first roller and a second roller; A heat treatment step of heat-treating the stretched yarn in a contact or non-contact heater;

An air entanglement step of forming an air entanglement of the heat-treated yarn with a smart air nozzle; and a winding step of winding the air-interwoven recycled latent crimped composite yarn.

In addition, the recycled polyester partially oriented yarn provides a method for producing a recycled polyester stretchable composite yarn, characterized in that the yarn is produced with a spinning speed of 2,900 to 3,300 m/min and a fineness of 125De'.

In the yarn supply step, the recycled polyester partially oriented yarn (POY) and the recycled polyester latent crimp yarn have a tension of 8 to 12g between a separate roll and a nip roller, and a deviation of the tension is within ±2g. It provides a method for manufacturing recycled polyester stretchable composite yarn.

The recycled polyester stretchable composite yarn thus prepared is made into a fabric through warp knitting and weaving, and then provided as a fabric or knitted fabric for clothing.

Recycled polyester partially oriented yarn (POY) and recycled polyester latent crimped yarn are supplied using separate rolls, so that the tension of each yarn supplied to the nip roller can be maintained and managed at a constant level, thereby significantly reducing process defects. can reduce

In addition, since it has eco-friendliness, which is a characteristic required by the current clothing material market, and has high price competitiveness through the development of functional materials with excellent elasticity, its application range can be expanded to various clothing materials.

1 is a manufacturing process flow chart for the production of recycled polyester stretchable composite yarn according to the present invention.
2 is a schematic diagram of a manufacturing apparatus for manufacturing recycled polyester stretchable composite yarn according to the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, detailed descriptions of related known functions or configurations are omitted in order not to obscure the gist of the present invention.

1 is a manufacturing process diagram for the production of eco-friendly recycled polyester stretchable composite yarn according to the present invention, Figure 2 is a schematic diagram of a manufacturing apparatus for eco-friendly recycled polyester stretchable composite yarn according to the present invention.

In the preparation step (S10) of recycled polyester partially oriented yarn (POY) for manufacturing eco-friendly recycled polyester stretchable composite yarn according to the present invention, the recycled polyester resin is supplied to an extruder and extruded while spinning via a spinning beam. It is manufactured by

Referring to FIGS. 1 and 2, in the recycled polyester partially oriented yarn (POY) preparation step (S10), the recycled polyester partially oriented yarn is prepared under melt spinning through drying of recycled polyester flakes and an extruder. Recycled polyester flakes are purchased and used after collecting waste PET, separating foreign substances, and going through wet grinding, classification, wet grinding, and classification. However, in the present invention, recycled polyester flakes having an IV of 0.70 to 0.8 dl/g, a PVC content of 10 to 200 ppm, and a moisture absorption of 0.4 to 2% by weight are used, and spinning is performed by lowering the spinning temperature. By doing so, it is possible to prevent the problem of thread cutting and poor quality, and it is possible to delay the increase in the spinning pressure over the spinning time by strengthening the pack filtration conditions.

The recycled polyester flakes go through a separate drying system (not shown) for crystallization and dehumidification before being supplied to an extruder. The drying system is divided into crystallization drying and dehumidifying drying. Crystallization drying is to prevent flakes for spinning from being fused to each other to form a bridge, and dehumidifying drying is to remove moisture inside the flakes. The lower the final moisture content, the less defects in the spinning process and the improved physical properties of recycled polyester yarn.

The crystallization drying is carried out for a total of 5.0 to 7.0 hours by varying the time for each temperature section in the temperature range of 80 to 130 ° C, and the dehumidifying drying is carried out for 30 minutes to 2 hours at a temperature of 120 to 130 ° C, and the final moisture content is 100 ppm make it below

The recycled polyester flakes dried in this way are supplied to the extruder, which is an extrusion device. The supplied recycled polyester flakes are separated into #1, #2, #3, and #4 in the melting zone according to the movement path of the polyester resin. should be controlled by In the present invention, each zone is set at a temperature of 280 ~ 290 ℃ can be set to a temperature lower than the melting temperature of 285 ~ 295 ℃ general polyester spinning. This is because the recycled polyester resin used in the present invention has an intrinsic viscosity of 0.70 to 0.80 dl/g and a melting temperature of 250 to 259 ° C., which is lower than the intrinsic viscosity and melting temperature of new polyester. It also affects the mechanical properties of stretchable composite yarns.

It is produced by spinning the spinning stock solution melted in the extruder through a spinning beam, and the recycled polyester partially oriented yarn (POY) is spun through a spinneret at a spinning temperature of 280 to 285 ° C and a rapid cooling temperature. (Quenching Temp) It is spun at 20~25℃ and is made of recycled polyester partially oriented yarn (POY) while being drawn at a constant draw ratio between Godet Roller 1 and Godet Roller 2. The recycled polyester partially oriented yarn (POY) produced in this way is wound under conditions of a winding speed of 2,900 to 3,3000 m/min and a final fineness of 125 De'.

On the other hand, in the recycled polyester-based latent crimped yarn preparation step (S20), recycled polyester resins having different viscosities are used by spinning from side-by-side type spinning nozzles. As the difference in intrinsic viscosity between the two polymers, high-viscosity polyester and low-viscosity polyester, increases, the crimp expression effect due to the difference in shrinkage increases, so high elasticity is exhibited.

According to FIG. 2, the yarn supplying step (S30) of the recycled polyester partially oriented yarn (POY) and the recycled polyester-based latent crimped yarn is performed on the yarn of the improved ply-twisted yarn machine, which has a structure different from that of the existing ply-twisted yarn machine. supplied according to

First, the recycled polyester partially oriented yarn (POY) 10 is supplied to the Nip Roller 40 via a separate roll 31 and a separate roll 33 for plying after being deposited on the creel. . In addition, the recycled polyester-based latent crimped yarn 20 is designed to be supplied to the nip roller 40 via the separate roll 32 and the separate roll 33 for plying.

As the four yarns are designed in this way, the yarn supply tension of each supply yarn can be adjusted independently from the influence caused by the supply of other yarns. In conventional ply-twisted yarn equipment without separate rolls, the tension range of the supplied yarn is measured in the range of 5 to 15 g, and the variation in tension is large within the range of ± 5 g, resulting in many quality defects. However, according to the installation of the separate roll 30 of the present invention, the yarn tension range measured between the separate roll 33 and the nip roller 40 can be managed at the level of 8 to 12 g, and the deviation of the tension is at the level of ± 2 g. management becomes possible

As the variation in yarn tension is reduced, hairs and loops occurring in the appearance of the manufactured composite yarn are significantly reduced, and workability and quality uniformity can be further improved.

In the yarn drawing step (S40), the recycled polyester partially oriented yarn (POY) 10 and the recycled polyester-based latent crimped yarn 20 depend on the difference in linear speed between the first roller 50 and the second roller 70, respectively. It is a step that is elongated by Particularly, the recycled polyester partially oriented yarn (POY) 10 is drawn at a draw ratio of 1.4 to 1.6 to have a final fineness of 75 to 85 De'.

While being drawn in the yarn drawing step (S40), each yarn is simultaneously subjected to a heat treatment step (S50) in which each yarn is heat treated in the contact heater 50 and the non-contact heater 60 on the sand. The heat treatment temperature of the contact heater 50 is in the range of 100 to 160°C, and the heat treatment temperature of the non-contact heater is in the range of 160 to 210°C.

The heat-treated yarn goes through an air entanglement step (S600). Each of the recycled polyester partially drawn yarn (POY) 10 and the recycled polyester latent crimped yarn 20 passing through the second roller 70 are plied through air entanglement in the air nozzle 80. At this time, the air nozzle 80 used for air bridging provides air bridging by supplying air at a pressure within 1.0 to 3.0 kg/m ² , and the diameter of the air outlet of the air nozzle is 1.0 to 1.6 mm. The air nozzle 80 used can be selected from smart air nozzles and tandem air nozzles, and the tandem type has two or more holes through which air is discharged from the nozzle formed on the four sides As a result, the effect of air entanglement can be further improved, and the mixed fineness can be further improved by introducing an inverter to supply air at a uniform pressure.

If the conventional nozzle is a method in which air comes out through a certain hole through the air of the compressor, the smart nozzle can uniformly control the nip density because it can reduce the air deviation discharged from the hole by uniformly controlling the air through an electrical signal. It has the advantage of maximizing the fineness of the blend.

The winding step of the recycled polyester stretchable composite yarn (S70) is a step of winding the recycled polyester stretchable composite yarn in which the air entanglement is formed at a winding speed of 550 to 850 m/min. The recycled polyester stretchable composite yarn thus produced has a final fineness of 180 to 220 De', strength of 2.6 to 3.2 g/De', and elongation of 15.0 to 25.0%.

The recycled polyester stretchable composite yarn of the present invention is manufactured into a yarn for fabric manufacturing through a twisting process for imparting twist within the range of 600 to 2000TM. Fabric for clothing is prepared by applying a conventional one-bath dyeing method in which fabric manufactured by weaving or knitting using the twisted yarn as warp or weft yarn is dyed in a high-temperature and high-pressure rapid dyeing machine at 100 to 130 ° C. for 2 to 5 hours. can do.

The present invention will be described in detail through the following examples. This embodiment is intended to be specifically described using the most preferred embodiment of the present invention to the extent that those skilled in the art can easily practice the technical idea of the present invention. The scope is not limited to these examples.

< Example 1-1~1-3> Drying step of recycled polyester resin

Recycled polyester flakes were used that had an intrinsic viscosity of 0.70 to 0.80 dl/g, a PVC content of 10 to 200 ppm, a moisture absorption of 0.4 to 2% by weight, and a melting temperature of 250 to 259 ° C. Before inputting into the drying system, crystallization drying and dehumidification drying were performed under the conditions of Examples 1-1 to 1-3. Crystallization drying was performed at a temperature range of 80 to 130 ° C. for a set time, respectively, and dehumidification drying was performed at 130 ° C. for 30 minutes.

[Table 1]

Depending on the treatment time in each temperature range of crystallization and drying, the final moisture content and whether or not fusion between chips appeared different, and when comparing moisture content and bridging, Examples 1-3 achieved the lowest moisture content, bridging did not occur.

< Example 2> recycled polyester partially oriented yarn ( POY ) Preparation step (S10)

The recycled polyester flakes of Example 1 are supplied to the extruder using a feeder, and the spinning temperature is 275 to 290 ° C. ) Recycled polyester partially oriented yarn (POY) was prepared by adjusting as follows under conditions of 20 ~ 25 ℃ and winding speed of 2,900 ~ 3,3000 m / min.

[Table 2]

Recycled polyester partially oriented yarn (POY) produced under the above conditions has a final fineness in the range of 125±2.5De', and when comparing defects such as single yarn breakage, weak yarn, poor appearance, wool, and loops in the production process, Example The process condition according to 2-2 was the best.

< Example 3> Recycle Manufacturing of polyester stretchable composite yarn

In the composite yarn manufacturing apparatus of FIG. 2, recycled polyester partially drawn yarn (POY) 125De' (10) and recycled polyester latent crimped yarn 100De' (20) according to Example 2 were prepared, respectively, and the recycled polyester portion The stretched yarn 10 is prepared by being loaded on a creel, and then supplied to the nip roller 40 via a separate roll 31 and a separate roll 33 for plying.

In addition, the recycled polyester-based latent crimped yarn 20 is designed to be supplied to the nip roller 40 via the separate roll 32 and the separate roll 33 for plying.

The recycled polyester partially oriented yarn (POY) 10 and the recycled polyester latent crimped yarn 20 are drawn by the difference in linear speed between the first roller 50 and the second roller 70, respectively. The ester partially oriented yarn (POY) 10 is drawn at a draw ratio of 1.4 to 1.6 to have a final fineness of 75 to 85 De'.

At the same time as the stretching, each yarn is heat treated in the contact heater 50 and the non-contact heater 60 on the four sides, respectively. Heat treatment is performed in the range of 210 ° C.

Each of the recycled polyester partially drawn yarn (POY) 10 passing through the second roller 70 and the recycled polyester latent crimped yarn 20 are plied through air entanglement in the air nozzle 80. At this time, the air nozzle 80 used for air bridging provides air bridging by supplying air at a pressure within 1.0 to 3.0 kg/m ² , and the diameter of the air outlet of the air nozzle is 1.0 to 1.6 mm. As the air nozzle 80 used, a smart air nozzle and a tandem air nozzle may be used, respectively.

The recycled polyester stretchable composite yarn in which the air entanglement is formed is wound at a winding speed of 550 to 850 m/min. The recycled polyester stretchable composite yarn thus produced has a final fineness of 180 to 220 De', strength of 2.6 to 3.2 g/De', and elongation of 15.0 to 25.0%.

Appearance, wool, and loop evaluation were evaluated by measuring the number of weaving per 1m and giving a score of 1 point to 5 points of bad, and for workability, a score of 1 point to 5 points of good was measured by measuring single yarn and thread breakage during the process. did Considering overall appearance evaluation, hair, loop occurrence, and workability, Example 3, which has a separate roll in the yarn supply step and reduces the error range of tension, was found to be excellent.

As such, the recycled polyester stretchable composite yarn manufactured under the process conditions has different shrinkage characteristics of the two yarns, so it has excellent bulkiness and warmth on the fabric after dyeing, and has a soft touch.

10: recycled polyester partially oriented yarn
20: recycled polyester latent crimp yarn
30: separate Roll
40 : Nip Roller
50: first roller (GR ₁ : contact heater)
60: non-contact heater
70: 2nd roller (GR ₂ )
80: air nozzle
90: winding roller

Claims (4)

recycled polyester partially oriented yarn (POY) preparation step;
Recycled polyester latent crimp yarn preparation step;
A yarn supply step of supplying recycled polyester partially oriented yarn (POY) and recycled polyester latent crimped yarn through a separate roll;
A yarn drawing step of stretching each of the yarns between a first roller and a second roller;
A heat treatment step of heat-treating the stretched yarn in a contact or non-contact heater;
An air entanglement step of forming an air entanglement of the heat-treated yarn with a smart air nozzle; and
A method for producing recycled polyester stretchable composite yarn, comprising a winding step of winding the air-interwoven recycled latent crimped composite yarn. According to claim 1,
The recycled polyester partially oriented yarn is a method for producing a recycled polyester stretchable composite yarn, characterized in that produced by spinning speed of 2,900 to 3,300m / min, fineness 125De '. According to claim 1,
In the yarn supply step, the recycled polyester partially oriented yarn (POY) and the recycled polyester latent crimp yarn have a tension of 8 to 12g between a separate roll and a nip roller, and a deviation of the tension is within ±2g. Manufacturing method of recycled polyester stretchable composite yarn. A recycled polyester stretchable composite yarn produced by the manufacturing method of any one of claims 1 to 3.

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