KR20220135298A - Recycled polyester-based partially oriented yarn and manufacturing method of high stretch composite yarn using the same - Google Patents

Abstract

Provided is a recycled polyester partially oriented yarn (POY) manufacturing method, comprising a recycled polyester flake drying step, a recycled polyester flake melting step, a recycled polyester flake homogenization step, a recycled polyester partially oriented yarn (POY) spinning step, and a recycled polyester POY winding step. According to the present invention, the method for manufacturing the recycled polyester POY can reduce manufacturing costs by more than 30% by directly melting and spinning recycled polyester flakes without depolymerization, oligomer production, polymerization, and chip manufacturing processes. Recycled polyester (PET) stretchable composite yarn according to the present invention enables composite yarn having various interweaving degrees on the surface of the yarn to be manufactured such that a fabric with natural effects and excellent elasticity can be manufactured.

Description

Recycled polyester-based partially oriented yarn and manufacturing method of high stretch composite yarn using the same}

The present invention relates to a method for producing recycled polyester partially drawn yarn (POY) produced by directly using polyester flakes prepared by collecting waste polyester, separating, washing, and pulverizing the waste polyester as a raw material for spinning.

In addition, the recycled polyester (PET) partially drawn yarn (POY) and polyester (PET) latent crimped yarn are composited so that the recycled polyester partially drawn yarn is exposed to the surface as an effect yarn. it's about

In the apparel industry, the core of product planning is changing to effectively reflect and satisfy complex and dynamic consumer sensibility by harmonizing materials and styles. It is not an exaggeration to say that the choice of material determines the overall quality through interaction with other factors in the final product, so it is not an exaggeration to say that the choice of material determines the sales of the product. Therefore, in order to more accurately reflect consumers' delicate emotional needs in product planning, an integrated study on factors that can affect the image of fashion materials is needed.

Germany's Adidas, the world's second largest sporting goods brand, recently announced that it will stop using general polyester for all shoes and clothing from 2024 and use only recycled polyester. is expanding

Adidas, a global brand, introduced running shoes using plastic waste collected from the ocean together with the marine environment protection group Par for the Ocean, and an average of 11 plastic bottles per pair were recycled. I believe that the company has a great power to make a difference,' and announced that by 2024, all shoes and clothing will be made of environmentally friendly materials made from recycled plastic waste instead of polyester.

When using this ECO-friendly Recycle Stretch composite yarn material, it is expected to increase sales in the domestic and overseas textile market by developing a new material that has the advantages of eco-friendly materials, has a soft feel and a new sensibility different from existing materials, and has excellent price competitiveness.

Latent crimped fibers are two types of polymers with different heat shrinkage properties, which are compound-spun in a side-by-side or sheath-core type, and then heat-shrinkable by applying heat in the spinning process or the stretching process. It is a fiber with a high degree of elasticity with a principle similar to that of a spring by physically giving it a coil shape due to the gender difference.

Although it does not reach the existing spandex fibers in elasticity, the disadvantages of spandex include latent crimped fibers that are excellent in alkali resistance and shape stability, and are easy to dye and post-processing.

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

In addition, recycled polyester (Recycled PET) used in the present invention is a material recycle that recycles by melting and spinning after refining raw materials from waste materials or waste materials recovered from used products during the polyester manufacturing process, and recovered raw materials It can be divided into Chemical Recycle to manufacture yarn by refining and depolymerizing, then repolymerizing and melt spinning.

Material Recycle can recycle raw materials relatively easily, but it is difficult to control the purity and polymerization degree of the material, and it is difficult to obtain a polymer with uniform properties. This was solved in the present invention because of the need.

In order to be used as a yarn for long fibers, polyester flakes recovered by a chemical recycle process were depolymerized, and a polymer was prepared through a separate polymerization process and used as a raw material for spinning.

Korean Registration Publication No. 10-2183241 Korean Registration Publication No. 10-1851644

Recycled polyester flake is a pulverized product of polyester produced by collecting waste PET bottles that are discarded after use by consumers, separating soil or debris, washing, pulverizing and drying.

In general, as a method of recycling recycled polyester flakes, a process of producing oligomers by glycolysis of recycled polyester through depolymerization using ethylene glycol and polymerizing the oligomers again to produce recycled polyester chips is used. have.

This method of recycling recycled polyester through depolymerization has excellent properties of recycled polyester, but because it undergoes a complicated treatment process to recycle polyester, the manufacturing cost increases and the manufacturing process takes a long time to recycle waste polyester. there is a decrease in efficiency.

Therefore, there have been attempts to use recycled polyester flakes to manufacture fiber yarns without going through complicated processes such as depolymerization, oligomer production, and polymerization of recycled polyester flakes. Due to the problems such as low physical properties of the manufactured yarn and deterioration of whiteness, it became a problem when applied as a yarn for clothing materials.

If a polyester partially drawn yarn (POY) can be produced by directly melt-spinning recycled polyester flakes, a recycled stretchable composite yarn using recycled polyester as a main raw material can be produced by ply stretching and composite with polyester latent crimped yarn. have.

The present invention prepares recycled polyester partially drawn yarn (POY) by drying, melting, microfiltration and homogenizing recycled polyester flakes and spinning them directly, and forms ply-stretched, composite, and air entanglement with polyester latent crimped yarn. An object of the present invention is to provide a method for manufacturing a recycled polyester stretchable composite yarn.

The present invention in order to achieve the above object, the drying step of the recycled polyester flakes; Melting step of recycled polyester flakes; Homogenization of recycled polyester flakes; Recycled polyester partially drawn yarn (POY) spinning step; It provides a method for producing a recycled polyester partially drawn yarn (POY), characterized in that it comprises a winding step of the recycled polyester partially drawn yarn (POY).

The drying step of the recycled polyester flakes is a recycled polyester part, characterized in that it is dried for 180 to 240 min at a temperature of 160 to 180 ° C. by crystallization drying, and dried for 20 to 60 min at 180 to 200 ° C. as dehumidification drying. A method for manufacturing a drawn yarn is provided.

In addition, in the melting step of the recycled polyester flakes, the melting section of the extruder is divided into three sections, and the recycled polyester is melted while passing through a section where the temperature of each section is 270 to 295 ° C. A method for manufacturing a partially drawn yarn is provided.

Between the melting step of the recycled polyester flakes and the recycling polyester partially drawn yarn (POY) manufacturing step, three filter devices having a pore size in the range of 20 to 50 μm are further provided, so that the molten polyester flakes are filtered. It provides a method for producing a partially drawn recycled polyester yarn, characterized in that it further comprises a filtration step of the recycled polyester.

The homogenizing step of the recycled polyester flakes is provided with a reactor whose interior is partitioned into a plurality of columns, so that the molten polyester flakes pass through and the molten polyester is homogenized. Provides a method for producing a recycled polyester partially drawn yarn do.

It provides a recycled polyester partially drawn yarn produced by the above method.

On the other hand, the recycled polyester partially drawn yarn is used as an effect yarn, and the polyester latent crimped yarn is ply drawn and compounded by screening, and the diameter of the air nozzle for air entanglement is 1.4 to 1.8 mm, and the supplied air pressure is 0.8 to 2.2 kg. /cm ² It provides a method for manufacturing a recycled polyester stretchable composite yarn, characterized in that it is manufactured by winding at a speed of 600 to 800 m/min.

In addition, there is provided a recycled polyester stretchable composite yarn produced by the method as described above.

According to the present invention, polyester partially drawn yarn (POY) can be manufactured by directly melt spinning recycled polyester flakes by omitting the processes of depolymerization, oligomer manufacturing, repolymerization, and chip manufacturing, thereby reducing the manufacturing cost by 30% or more. It is possible to manufacture recycled polyester partially drawn yarn (POY) for clothing with physical properties.

The recycled polyester (PET) stretchable composite yarn according to the present invention can manufacture a composite yarn having various blend finenesses on the surface of the yarn, so that a fabric having a natural effect and excellent elasticity can be manufactured.

In addition, by changing the air nozzle type in the manufacturing process of the composite yarn and establishing the optimal conditions for manufacturing the composite yarn, the problems of whiteness difference, weaving burst, weaving, and weaving defect are remarkably reduced.

1 is a manufacturing process diagram of a recycled polyester (PET) partially drawn yarn according to the present invention.
2 is a schematic diagram of a spinning process for producing a recycled polyester (PET) partially drawn yarn (POY) according to the present invention.
3 is a schematic diagram of a manufacturing apparatus for a recycled polyester (PET) elastic composite yarn according to the present invention.
4 is a real image of a tandem-type air nozzle applied to the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in the drawings, the same components or parts are denoted by the same reference numerals as possible. In describing the present invention, detailed descriptions of related known functions or configurations are omitted so as not to obscure the gist of the present invention.

The terms 'about', 'substantially', etc. to the extent used in the specification of the present invention are used in or close to the numerical value when manufacturing and material tolerances inherent in the stated meaning are presented, and are used in the meaning of the present invention. Accurate or absolute figures are used to prevent infringing and unfair use of the mentioned disclosure for better understanding.

1 is a manufacturing process diagram of a recycled polyester stretchable composite yarn according to the present invention, FIG. 2 is a schematic diagram of a spinning process for melt spinning of recycled polyester (PET) flakes according to the present invention, and FIG. 3 is a recycled polyester according to the present invention It shows an apparatus for manufacturing a stretchable composite yarn.

The recycled polyester (PET) stretchable composite yarn according to the present invention is manufactured by ply stretching, composite, heat treatment and air entanglement of recycled polyester partially drawn yarn (POY) and polyester latent crimped yarn.

The recycled polyester flakes are purchased and used by collecting waste PET according to a known manufacturing process, separating foreign substances, and then performing wet grinding, fractionation, wet grinding, and fractionation.

1 and 2, the recycled polyester flake is first dried, melted, filtered, homogenized, and directly spun to prepare a partially oriented polyester yarn (POY: Partially Oriented Yarn).

As shown in FIG. 2, the spinning process performs crystallization drying and dehumidification drying by means of a dryer (1), and while melt-extruding in an extruder (2), filtration consisting of a 1st filter and a 2nd filter As it passes through the filter (3), the impurity is removed. The molten polyester flakes from which impurities have been removed are homogenized while passing through a plurality of partitioned columns inside the reactor (Reaction M/C), and are quantitatively discharged by the booster pump through an additional filter (3rd filter) to the spinning zone ( It is supplied to the Spinning Zone (5) and spun through the spinneret of the spinning block to make polyester partially drawn yarn (POY).

First, the recycled polyester flakes are supplied to the dryer 1 in the drying step (S10) of the recycled polyester flakes. The dryer 1 is a device that removes the moisture of the supplied recycled polyester flakes below a certain level, and the recycled polyester flakes are dried through two stages of crystallization drying and dehumidification drying in this device. Crystallization drying is a process that allows the surface to be crystallized so that the polyester flakes do not stick to each other at high temperatures, and dehumidification drying is a process of removing moisture to a level of 100 ppm or less at an appropriate level in the subsequent melt spinning process.

Crystallization and drying of the recycled polyester flakes are carried out stepwise for 180-240 min at a temperature range of 160-180°C. When the crystallization drying temperature is lower than 160℃, the degree of surface crystallization is insignificant, and agglomeration occurs due to the bridge phenomenon due to adhesion between the flakes in the subsequent dehumidification and drying step. .

Dehumidification drying may be carried out at a high temperature of 180 to 200° C. for 20 to 60 min in order to lower the moisture content of the recycled polyester flakes, which is crystallized and prevented from bridging, to a level of 100 ppm or less. Considering the workability of the subsequent spinning process, the process defect, and the physical properties of the finally manufactured recycled polyester partially oriented yarn (POY), the lower the moisture content, the more advantageous.

The recycled polyester flakes that have undergone the drying process are melted while being continuously supplied to the extruder 2 (S20). In the extruder (2), the melting section is divided into three sections (#1, #2, #3), and the temperature of each section is set within the range of 270 to 295 ° C. It is gradually melted as it passes and is provided to the recycled polyester flake homogenization step (S30).

If the temperature of sections #1 to #3 of the extruder is less than 270℃, it is not easy to melt the supplied recycled polyester flakes, and the load on the screw inside the extruder is increased, and clogging may occur. When the temperature of sections 1 to #3 exceeds 295° C., the polymerization degree of the polyester flakes is lowered, resulting in process defects, and the physical properties of the recycled polyester partially drawn yarn (POY) produced are low.

The recycled polyester flakes melted in the extruder 2 are supplied to the homogenization step S30 of the recycled polyester flakes through a filter 3 . The filter filtration device is composed of a plurality of mesh filters having a pore size of 20-50 μm to remove impurities and foreign matter contained in the recycled polyester flakes. The filter filtration device is a plurality of each on the movement path of the molten recycled polyester before being supplied to the reactor (Reaction M/C) (4) for the polyester flake homogenization step (S3) and after going through the reactor (Reaction M/C) can be provided with

The homogenization step (S30) of the recycled polyester flakes is carried out while passing through the reactor (Reaction M/C)) (4). The inside of the reactor is divided into 10 to 12 columns, and a vacuum environment is made to As it passes through the column, the polyester flakes are uniformly mixed and the IV is homogenized. The homogenized molten recycled polyester flakes have an intrinsic viscosity (IV) of 0.6 dl/g to 0.8 dl/g.

The recycled polyester flakes that have undergone the homogenization step (S30) are quantitatively measured by a booster pump and supplied to the spinning zone (5), and recycled polyester partially drawn yarn (POY) spinning step (S40) is performed When discharged through the spinneret in the spinning zone, the spinning temperature is in the range of 270 to 290 °C, and the spinning speed is 2500 to 3500 m/min, so that recycled polyester partially drawn yarn (POY) is spun (S40).

If the spinning temperature is less than 270℃, a large number of single yarn breakage occurs when discharging from the spinneret, and workability is reduced. It can cause pharmaceutics, poor appearance, hair, and loops.

In the winding step (S50) of the recycled polyester partially drawn yarn, the recycled polyester partially drawn yarn (POY) discharged from the spinneret is cooled to a temperature of 20 to 50 ° C. is manufactured with

The recycled polyester partially drawn yarn (POY) produced in this way is supplied as an effect yarn, and the polyester latent crimped yarn is supplied for screening, and the recycled polyester yarn is subjected to ply stretching, compounding, heat treatment and air entanglement in the composite yarn manufacturing apparatus of FIG. It is made of ester stretchable composite yarn.

The polyester-based latent crimp yarn is also advantageously manufactured by compound spinning each polyester (PET) spinning chip having high and low viscosity in a side-by-side type. As the latent crimping yarn 20, a latent crimping yarn having a fineness of 30 to 50De' is used. The side-by-side advantage of the side-by-side type fabricated in this way is that the latent crimped polyester yarn 20 is a fiber in which elasticity is expressed in such a way that a physical coil is formed by a difference in heat shrinkage by applying heat after composite spinning.

According to FIG. 3 , the recycled polyester partially drawn yarn 10 and the advantageously polyester (PET) latent crimped yarn 20 are supplied to GR ₁ (40). Each yarn loaded on the krill is supplied to GR ₁ with a constant tension via the nip roller 30, respectively.

The heat treatment is performed while passing through the contact heater 50 and the non-contact heater 60 . That is, the recycled polyester partially drawn yarn 10 and the double-stranded polyester latent crimped yarn 20 that have passed through the GR ₁ (40) are subjected to primary heat treatment while passing through the contact heater (50). At this time, the primary heat treatment temperature is 120 ~ 130 ℃. The yarn that has undergone the primary heat treatment process is heat-treated once again while passing through the non-contact heater 60 once again. Through the secondary heat treatment, more stable heat setting is achieved, and the change over time of the recycled polyester stretchable composite yarn produced is stably reduced, thereby preventing defects in weaving and dyeing processing processes. At this time, the heat treatment temperature is preferably made at 190 ~ 210 ℃.

Air entangling is a step of braiding the drawn and non-contact heat-treated recycled polyester partially drawn yarn 10 and the double-strength polyester latent crimped yarn 20 through air entangling. It is performed through an air nozzle 80 for air entangling. . Air entanglement was given by supplying air within 0.8 to 2.2 kg/m ² from the air nozzle 80 for air entanglement, and the diameter of the air discharge hole of the air nozzle was 1.4 to 1.8 mm. The air nozzle 80 used is a tandem type air nozzle, as shown in FIG. 4, and the tandem type has two or more holes through which air is discharged from the nozzle. It is a nozzle that has never been used in a composite yarn processing equipment.

In order to use a tandem-type air nozzle in the composite yarn processing apparatus, the present applicant modified the composite yarn processing apparatus and installed a tandem-type nozzle to further improve the effect of air entanglement. It was possible to further improve the blend fineness by supplying air with a varying pressure.

The number of air bridges formed by this is about 50 bridges per 1 meter. As described above, the appearance of the recycled polyester stretchable composite yarn produced by the air nozzle 80 pressure varying in the range of 0.8 to 2.2 kg/m ² is exposed on the surface of the recycled polyester (PET) partially drawn yarn and the latent crimped yarn inside. Since the core is positioned as the core, the elasticity of the manufactured knitted fabric is improved, and it has a soft touch and volume, and excellent deep color properties.

Recycled polyester stretchable composite yarn with air entanglement is wound on a winder at a speed of 600 to 800 m/m to prepare it for use in post-processing and knitting processes. According to the present invention, the recycled polyester (PET) elastic composite yarn is wound on a bobbin through a twisting process of imparting a twist within a range of 600 to 2000 TM to manufacture a yarn for fabric production.

Recycled polyester (PET) elastic composite yarn according to the present invention forms an examination part of the composite yarn because the polyester latent crimp yarn has a large shrinkage rate due to a difference in shrinkage after dyeing, and recycled polyester (PET) with a relatively low shrinkage Partially drawn yarn shows the maximum number of bending characteristics and protrudes on the surface, resulting in excellent tactile and natural properties, and excellent elasticity after dyeing.

The recycled polyester (PET) elastic composite yarn of the present invention is manufactured as a yarn for fabric production through a twisting process that imparts a twist within a range of 600 to 2000TM. Manufactured into fabric by applying a conventional polyester dyeing method of weaving or knitting fabrics made by using the twisted yarns as warp or weft yarns in a high-temperature and high-pressure rapid dyeing machine at 100-130 ° C. for 2-5 hours can do.

The fabric or knitted fabric dyed in this way exhibits excellent tactile feel due to the air entanglement effect given to the recycled polyester stretchable composite yarn in the air entanglement step and the partially drawn polyester yarn protruding from the surface.

Hereinafter, the present invention will be described in detail through examples. This embodiment is intended to be described in detail using the most preferred embodiment of the present invention to the extent that a person of ordinary skill in the art to which the present invention pertains can easily implement the technical idea of the present invention. The scope is not limited to these examples.

< Example 1-1 to 1-3> Recycled polyester flake dry

Recycled polyester flakes with a particle size of 8 to 10 m/m and a moisture content of 1.0wt% are supplied to the dryer (1) and dried according to the following conditions while measuring moisture content using a moisture meter according to each condition and using a bridge ) to check whether the phenomenon occurred.

[Table 1]

As a result of the measurement of moisture content, the moisture content was measured as low as 50 ppm or less in Examples 2 and 3, which were dried at a crystallization drying temperature of 160 ° C. for 90 min, 170 ° C. 60 min, and 180 ° C. 60 min. In 3, it was confirmed that the condition of Example 2 was the most excellent because a bridge phenomenon in which the recycled polyester flakes were fused to each other occurred.

< Example 2-1 ~ 2-3> Recycled polyester Partially drawn yarn (POY) Produce

While supplying the recycled polyester flakes dried according to Example 1 to the extruder (2), the temperature for each melting section of the extruder was set differently, and while the spinning temperature of the spinning zone (5) was changed, drip properties, spinning properties, and cross section Formability was evaluated by comparison.

[Table 2]

Drip property is a phenomenon in which the melted liquid that is discharged is agglomerated and falls when the molten polymer is discharged from the spinneret. It may appear when the spinning temperature is too high. , radioactivity is to compare the frequency of monofilaments occurring in the spinning process. As a relative comparison according to each example, ◎ very good / ○ good / △ average / X poor.

When the temperature of the melting section of the extruder is low, the spinnability and cross-section formation are poor, and when the temperature is too high, the drip property is poor. It was confirmed that the occurrence of defects such as appearance, hair, loops, etc. of the partially drawn polyester yarn was also small.

< Example 3-1 ~ 3-4> Manufacturing of recycled polyester elastic composite yarn

Recycled polyester partially drawn yarn (POY) and polyester latent crimped yarn were respectively placed and supplied on the creel of the composite yarn manufacturing apparatus of FIG. , As an air nozzle for air entanglement, the fineness and appearance were compared with each other while controlling the diameter of the temdem type air nozzle and the supplied air pressure.

[Table 3]

(1) Horn fineness evaluation

Horn fineness is a measure of the number of mixed yarns per 1m of composite yarn, indicating the uniformity of mixed fibers of two materials. Additionally, as a method of measuring horn fineness, water was placed in a rectangular tank, and the composite yarn was floated on the water surface, and the number of 1 m long horn islands was measured, and the number was measured visually by self-evaluation rather than standard evaluation. When the number of horns per 1m is more than 50, it is marked as excellent (◎), when it is 40 to 50, it is good ( ○ ), when it is 30 to 40, it is normal ( △) , and when it is less than 30, it is marked as bad ( × ).

As a result of examining the fineness and workability in each temperature section of the contact heater 50, it was found that the fineness and workability were relatively excellent in the temperature section of 120 to 130°C.

(2) Appearance evaluation

Appearance evaluation was conducted through mutual comparison by 5 experts, and the average score was 5 points excellent (◎), 3-4 points good ( ○ ), and 2 points were given by giving a score of 1 bad to 5 excellent. ( Δ) , if it was less than 2 points, it was marked as defective ( × ).

When the diameter of the air nozzle is 1.6mm, the blend fineness is the best, and it is judged that the occurrence of loops or hairs is small in the appearance evaluation.

10: recycled polyester partially drawn yarn
20: double strength polyester latent crimp yarn
30: Nip Roller
40: Goder Roller 1 (GR ₁ )
50: contact heater
60: non-contact heater
70: Goder Roller 2 (GR ₂ )
80: air nozzle
90: winding roller

Claims (7)

Drying step of recycled polyester flakes;
Melting step of recycled polyester flakes;
Homogenization of recycled polyester flakes;
Recycled polyester partially drawn yarn (POY) spinning step; and
A method for producing a recycled polyester partially drawn yarn (POY), characterized in that it comprises a winding step of the recycled polyester partially drawn yarn (POY).
According to claim 1,
The drying step of the recycled polyester flakes is a recycled polyester part, characterized in that it is dried for 180 to 240 min at a temperature of 160 to 180 ° C. by crystallization drying, and dried for 20 to 60 min at 180 to 200 ° C. as dehumidification drying. A method of manufacturing a drawn yarn.
According to claim 1,
In the melting step of the recycled polyester flake, the melting section of the extruder is divided into three sections, and the recycled polyester part is melted while passing through a section where the temperature of each section is 270 to 295 ° C. A method of manufacturing a drawn yarn.
According to claim 1,
Three filter devices having a pore size in the range of 20-50 μm are further provided between the melting step of the recycled polyester flakes and the recycling polyester partially drawn yarn (POY) manufacturing step, so that the molten polyester flakes are filtered. A method for producing a partially drawn recycled polyester yarn, characterized in that it further comprises a filtration step of the recycled polyester.
According to claim 1,
The homogenizing step of the recycled polyester flakes is provided with a reactor in which the inside is divided into a plurality of columns, and the molten polyester flakes pass through, and the molten polyester is homogenized.
According to claim 1,
The homogenizing step of the recycled polyester flakes is provided with a reactor in which the inside is divided into a plurality of columns, and the molten polyester flakes pass through, and the molten polyester is homogenized.
The recycled polyester partially drawn yarn of paragraph 6 is used as an effect yarn, and the polyester latent crimped yarn is multi-drawn and compounded. /cm2 A method of manufacturing a recycled polyester stretchable composite yarn, characterized in that it is manufactured by processing at a speed of 600-800 m/min and winding at a speed of 600-800 m/min.

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