KR102380277B1 - Manufacturing method of high elasticity recycled PET/PTT-based latent crimped composite yarn with excellent deep colorability and fabric using the same - Google Patents

Abstract

The present invention relates to a high-elasticity recycled polyethylene terephthalate (PET)/polytrimethylene terephthalate(PTT)-based latent crimped composite yarn with excellent bathochromic properties, which combines recycled PET partially drawn yarn and recycled PET/PTT latent crimped yarn to provide new functionality. According to the present invention, recycled PET partially drawn yarn and recycled PET/PTT latent crimped yarn are processed through multi-stage heat treatment and air entanglement, so natural emotion differentiated from existing composite yarns can be provided and excellent elasticity and bathochromic properties can be provided when the yarn is woven to fabric. Accordingly, a latent crimped composite yarn produced by multi-stage heat treatment and air entanglement of recycled PET partially drawn yarn and recycled PET/PTT latent crimped yarn provides excellent blend fineness and increased workability. The method comprises a partially drawn yarn preparation step, a latent crimped composite yarn preparation step, a yarn supply step, a heat treatment step, an air entanglement step, and a winding step.

Description

Manufacturing method of high elasticity recycled PET/PTT-based latent crimped composite yarn with excellent deep colorability and fabric using the same

The present invention is a composite of recycled polyethylene terephthalate (PET) partially drawn yarn (POY) and recycled polyethylene terephthalate (PET)/polytrimethylene terephthalate (PTT) latent crimped yarn, whereby the partially drawn polyester yarn is exposed to the surface as an effect yarn. It relates to highly elastic PET/PTT latent crimp composite yarn. By stretching the polyester partially drawn yarn and PET/PTT latent crimp yarn and forming multi-stage heat treatment and air entanglement, the natural emotional expression differentiated from the existing composite yarn is expressed. Color expression is possible.

In the apparel industry, the core of product planning is changing to effectively reflect and satisfy the complex and dynamic consumer's 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.

Recently, Germany's Adidas, the world's second largest sportswear brand, announced that it would stop using general polyester in 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 the 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 an eco-friendly material, 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 or stretching process. It is a fiber with a high degree of elasticity in a similar way to a spring by physically giving it a coil shape due to the sex 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 polyethylene terephthalate (Recycled PET) used in the present invention is a material recycle that regenerates 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 It can be divided into Chemical Recycle to manufacture yarn by refining and depolymerizing raw materials, then repolymerizing and melt spinning.

Material recycling can recycle raw materials relatively easily, but if it is difficult to control the purity and polymerization degree of the material, it is difficult to obtain a polymer with uniform physical properties, so the expansion of end use may be limited. Polymers are produced by polymerization, so it has the advantage of being able to produce excellent yarns with little difference in physical properties from those made from crude oil.

Korean Registration Publication No. 10-1979655 Korean Registration Publication No. 10-1851644

The present invention is a composite of a latent crimped yarn and a recycled polyethylene terephthalate partially drawn yarn produced by composite spinning recycled polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) in a side-by-side type. It is a latent crimped composite yarn manufactured by processing. The composite yarn produced in this way exhibits the feel and appearance of natural fibers while retaining elasticity similar to spandex yarn in the fabric. An object of the present invention is to provide a method for producing a latent crimped composite yarn having a low dyeing defect rate and excellent deep color properties by allowing the polyethylene terephthalate partially drawn yarn to protrude on the surface.

In addition, through multi-stage heat treatment of the supplied yarns, the mixing effect between the yarns is increased to improve the deep color, and by optimizing the diameter, number, and pressure of the air nozzle outlet, the effect of air entanglement is maximized to improve the blend fineness. An object of the present invention is to provide a method for manufacturing a recycled PET/PTT latent crimped composite yarn with excellent deep color properties.

In order to achieve the above object, the present invention, a recycle polyethylene terephthalate (PET) partially drawn yarn preparation step of fineness of 70 ~ 90 De'; Fineness 50-100 De' Recycled polyethylene terephthalate/polytrimethylene terephthalate (PTT) latent crimp yarn preparation step; A yarn supply step of supplying recycled polyethylene terephthalate partially drawn yarn (PET) and recycled polyethylene terephthalate (PET)/polytrimethylene terephthalate (PTT) latent crimp yarn to GR ₁ ; A heat treatment step of processing the supplied yarn in a contact heater and a non-contact heater; Air entangling step of braiding the heat-treated yarn through air entangling with an air nozzle; And it provides a method for manufacturing a highly elastic recycled PET / PTT latent crimped composite yarn excellent in deep color, characterized in that it comprises a winding step of winding the air-entangled latent crimped composite yarn composite yarn.

In addition, in the heat treatment step, the temperature of the contact heater is 110 ~ 125 ℃, and the temperature of the non-contact heater is 190 ~ 210 ℃ It provides a manufacturing method of highly elastic recycled PET / PTT latent crimped composite yarn excellent in deep color, characterized in that do.

In addition, the air pressure of the air entanglement step is 1.2 ~ 3.5kgf / cm ² , The diameter of the air discharge hole is 0.8 ~ 1.2mm High elasticity recycled PET / PTT latent crimping composite yarn excellent in deep color, characterized in that the manufacturing method is provided. do.

The air nozzle of the air entangling step provides a method for manufacturing a highly elastic recycled PET/PTT latent crimp composite yarn with excellent deep color, characterized in that the air nozzle is a tandem nozzle having two or more air discharge holes.

On the other hand, there is provided a highly elastic recycled PET/PTT latent crimp composite yarn with excellent deep color properties manufactured by the above manufacturing method.

Provided is a fabric manufactured using the recycled PET/PTT latent crimped composite yarn manufactured in this way.

According to the present invention, while braiding recycled polyethylene terephthalate partially drawn yarn and recycled PET/PTT latent crimped yarn, multi-stage heat treatment and air entanglement are formed using an air nozzle having a plurality of air outlets to increase the blend fineness of the composite yarn and increase the production process workability is improved in

The latent crimped composite yarn using recycled polyethylene terephthalate and recycled PET/PTT according to the present invention can manufacture a composite yarn having various blend fineness on the surface of the yarn, so it has a natural effect and produces a fabric excellent in deep color can do.

In addition, by sequentially performing heat treatment while passing through the contact heater and the non-contact heater, changes in elongation and shrinkage according to the process conditions after production, differences in whiteness, weaving breakage, weaving, and poor weaving were significantly reduced.

1 is a schematic diagram of a manufacturing apparatus for a highly elastic recycled PET/PTT latent crimp composite yarn having excellent deep color according to the present invention.
2 is a manufacturing process diagram of a highly elastic recycled PET/PTT latent crimp composite yarn having excellent deep color properties according to the present invention.
3 is a real image of a tandem type air nozzle applied in 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 whenever possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted so as not to obscure the gist of the present invention.

As used in the specification of the present invention, the terms 'about', 'substantially', etc. 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 schematic diagram of a manufacturing apparatus for a highly stretchable recycled PET/PTT latent crimped composite yarn with excellent deep color according to the present invention, and FIG. 2 is a manufacturing process diagram of a highly elastic recycled PET/PTT latent crimped composite yarn with excellent deep color according to the present invention. .

The highly stretchable recycled PET/PTT latent crimped composite yarn with excellent deep color according to the present invention is manufactured by braiding, heat-treating, and air entangling between a recycled polyethylene terephthalate partially drawn yarn and a recycled PET/PTT latent crimped yarn.

1 and 2, in the preparation step (S10) of the partially drawn recycled polyethylene terephthalate yarn, the recycled polyethylene terephthalate partially drawn yarn 10 prepared to the standard of fineness of 70 to 90De' is prepared in Creel.

The recycled polyethylene terephthalate partially drawn yarn is manufactured according to a known manufacturing method in which waste PET is collected according to a known manufacturing process, foreign substances are separated, and is manufactured into spinning chips through wet grinding, fractionation, wet grinding, and fractionation. buy and use

However, in the present invention, the recycled polyester resin has an intrinsic viscosity of 0.70 to 0.75 dl/g and a melting temperature of 256 to 259 ° C. , it is possible to delay the increase in the spinning pressure over the spinning time by strengthening the pack filtration conditions.

The latent crimped yarn preparation step (S20) is recycled PET/PTT manufactured by compound spinning recycled polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) in a side-by-side type. As the latent crimping thread 20, a latent crimping thread having a fineness of 50 to 100De' is prepared. The recycled PET/PTT latent crimped yarn 20 manufactured in this way is a fiber to which elasticity is imparted in such a way that a physical coil is formed by a difference in heat shrinkage by applying heat after composite spinning.

In the yarn supply step (S30), the recycled polyethylene terephthalate partially drawn yarn 10 and the recycled polyethylene terephthalate (PET)/polytrimethylene terephthalate (PTT) latent crimped yarn 20 are supplied to GR ₁ (40). is a step to Each yarn loaded on the krill is supplied to GR ₁ with a constant tension via the nip roller (30).

The heat treatment step S40 is performed while passing through the contact heater 50 and the non-contact heater 60 . That is, the recycled polyethylene terephthalate partially drawn yarn 10 and the recycled PET/PTT 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 110 ~ 125 ℃.

When the heat treatment temperature is lower than 110°C, many defects of wool or fim yarn occur on the surface of the latent crimped composite yarn produced. It is undesirable to harsh.

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 secondary heat treatment, more stable heat setting is achieved, and the change over time of the recycled PET/PTT latent crimped composite yarn manufactured is stably reduced, thereby preventing defects in the weaving and dyeing processing processes. At this time, the heat treatment temperature is preferably made at 190 ~ 210 ℃.

If the secondary heat treatment temperature is less than 190 ℃, the deep color and workability of the composite yarn is deteriorated. This is considered to be the cause of the poor blend fineness of the partially drawn recycled polyethylene terephthalate yarn acting as an effect yarn because sufficient heat treatment is not performed. In addition, if it exceeds 210 ℃, problems of deep color, single yarn, yarn breakage, and poor touch of the fabric increase. This is considered to be due to the decrease in elongation due to excessive heat setting and increase in yarn tension.

The air entangling step (S50) is a step of braiding the drawn and non-contact heat treated recycled polyethylene terephthalate partially drawn yarn 10 and recycled PET/PTT latent crimped yarn 20 through air entangling. (80). In the air entangling step (S40), the air nozzle 80 is positioned between the GR ₂ 70 and the linear speed control roller (not shown) to minimize the tension imparted to the yarn due to the speed difference on the yarn. is formed

The linear speed control roller is a part of the surface (1/2 of the roller width) of the GR ₂ (70) is cut using a cutting tool, and the diameter of the cutting part of the GR ₂ (70) is reduced, and the linear speed The linear speed of the composite yarn passing through the control roller is reduced (the overfeed provision according to GR ₂ and the linear velocity control roller is according to the configuration of the applicant's prior patent registration No. 10-19388838).

The overfeed is given by the difference in the linear speed between the GR ₂ 70 and the linear speed control roller, and in the present invention, the overfeed is given in the range of 1.01 to 1.03. Since the yarn tension passing through the air nozzle 80 is temporarily reduced by this overfeed rate, effective air entanglement is possible.

Air entanglement was given by supplying air within 1.2 to 3.5 kg/m ² from the air nozzle 80 in the air entanglement step (S50), and the diameter of the air discharge hole of the air nozzle was 0.8 to 1.2 mm. The air nozzle 80 used may be selected from a general type and a tandem type, and the tandem type is a conventional complex in which two or more holes through which air is discharged from the nozzle are formed on the slope. It is a nozzle that has never been used in yarn processing equipment. The present applicant modified the composite yarn processing device to use a tandem-type air nozzle in the composite yarn processing device and installed a tandem-type nozzle to further improve the effect of air entanglement. It was possible to further improve the fineness by supplying air at one pressure.

The number of air bridges formed by this is 30 to 60 bridges per 1 meter. The appearance of the recycled PET/PTT latent crimp composite yarn has a shape as shown in FIG. 4 by the changing air nozzle 80 pressure. As the surface of the latent crimped yarn has such an appearance, the elasticity of the manufactured knitted fabric is improved, and it has a soft touch and volume, and excellent deep color properties.

In the winding step (S60) step, the recycled PET/PTT latent crimped composite yarn formed with air entanglement is wound on the winder at a speed of 450 to 750 m/m to prepare it for use in subsequent post-processing and knitting processes. According to the present invention, the recycled PET/PTT latent crimped composite yarn is wound on a bobbin through a twisting process in which a twist is applied within a range of 600 to 2000 TM, thereby producing a yarn for fabric production.

The recycled PET/PTT latent crimped composite yarn according to the present invention forms an examination part of the composite yarn because of the difference in shrinkage after dyeing and the recycled PET/PTT latent crimped yarn has a large shrinkage, and recycled polyethylene terephthalate ( PET) Partially drawn yarn shows the maximum number of bending characteristics and protrudes on the surface to express excellent tactile and natural properties, and shows excellent deep colorability after dyeing.

The highly elastic recycled PET/PTT latent crimped composite yarn having excellent deep colorability of the present invention is manufactured as a yarn for fabric production through a twisting process that imparts a twist within the range of 600 to 2000 TM. Manufactured into fabric by applying a conventional polyester dyeing method in which the twisted yarn is used as warp or weft yarn to weave or knit the fabric produced by knitting in a high-temperature and high-pressure rapid dyeing machine at 100 to 130° C. for 2 to 5 hours. can do.

The fabric or knitted fabric dyed in this way has a deep color effect due to the air entangling effect given to the latent crimped composite yarn in the air entangling step (S40) and the partially drawn polyethylene terephthalate 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>

Recycled polyethylene terephthalate (PET) partially drawn (POY) (10) with a fineness of 80De' is prepared in the yarn supply krill, and recycled PET/PTT latent crimped yarn (20) with a fineness of 75De' is placed on another krill and supplied The yarn was prepared.

80De' recycled polyethylene terephthalate partially drawn yarn (10) and 75De' recycled PET/PTT latent crimped yarn (20) are supplied to GR ₁ (40) through a nip roller (30), and passed through a contact heater (50) Heat treatment was performed while

The heat treatment temperature of the contact heater 50 was carried out by dividing it into three sections of 95-110°C, 110-125°C, and 125-140°C, and the workability and deep color of the composite yarn were compared. The air pressure for air entanglement was controlled to be 1.2 to 3.5 kgf/cm ² , and the air entanglement was carried out with a diameter of 1.5 mm of the air discharge hole of the air nozzle, and was wound at a speed of 450 m/m for a total of 150 to 165. A denier recycled PET/PTT latent crimp composite yarn was prepared. The production conditions and characteristic evaluation results are shown in Table 1.

As a result of examining the deep color and workability in each temperature section of the contact heater 50, it was found that the deep color and workability were relatively excellent in the 110 to 125 °C temperature section.

< Example 2>

In Example 2, it is the same as in Example 1, except that the heat treatment is performed by configuring the passage to pass through the non-contact heater 60 without passing through the contact heater 50 .

The heat treatment temperature in the non-contact heater 60 was divided into three sections: 170 to 190 °C, 190 to 210 °C, and 210 to 230 °C, and tests were performed. As a result of comparative comparison of the results of non-contact heat treatment in this way, it was found that the deep color and workability of the recycled PET/PTT latent crimp composite yarn heat-treated in the range of 190 to 210 ° C were relatively excellent, and the results are shown in Table 1.

< Example 3-4>

In Example 3, the temperature conditions of the contact heater of Example 1 of 110 to 125 ° C, and the temperature conditions of the non-contact heater of Example 2 of 190 to 210 ° C and 210 to 230 ° C were applied to relatively evaluate the deep color and workability, and the results were Table 1 shows.

< comparative example >

Comparative Example was performed under the same conditions as in Example 1, except that air bridging was formed without heat treatment.

[Table 1]

The evaluation of deepness and workability was conducted through mutual comparison by 5 experts, and the average score was 5 points excellent (◎), 3~4 points good ( ○ ), 2 points by giving a score of 1 poor to 5 excellent. When it is , it is marked as normal ( △) , and when it is less than 2 points, it is marked as defective ( × ).

Example 1 in which only the contact heater was heat treated and Example 2 in which only the non-contact heater was heat treated were evaluated to be superior in deep color and workability than in Comparative Example in which no heat treatment was performed. In addition, in Examples 3 and 4 in which the heat treatment was performed by applying the contact heater and the non-contact heater at the same time, the deep color and workability were evaluated to be excellent, and the temperature condition in Example 3 was evaluated to be the most excellent.

< Example 5>

In Example 5, while applying the manufacturing conditions to the recycled PET/PTT latent crimped composite yarn of Example 3, while applying a regular air nozzle and a tandem nozzle, respectively, the effect of blending fineness according to the diameter of the air discharge hole was compared. The results are shown in Table 2.

Horn fineness is a measure of the number of mixed yarns per 1m of composite yarn, indicating the uniformity of mixed yarns of two materials. In addition, as a method of measuring the horn fineness, water was placed in a rectangular tank, 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 60, it is excellent (◎), when it is 45 to 60, it is good ( ○ ), when it is 30 to 40, it is normal ( △) , and when it is 30 or less, it is bad ( × ).

[Table 2]

In the case of a general air nozzle, it was found that the diameter and the fineness of the air discharge hole did not have a constant tendency, but relatively excellent at a specific diameter. In addition, even in the case of a tandem type air nozzle, it was found that the blend fineness was excellent at a specific diameter of 1.0 mm.

10: recycled polyethylene terephthalate partially drawn yarn
20: recycled PET/PTT 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 (6)

Recycled polyethylene terephthalate (PET) partially drawn yarn preparation step of fineness 70-90 De';
Fineness 50-100 De' Recycled polyethylene terephthalate/polytrimethylene terephthalate (PTT) latent crimp yarn preparation step;
A yarn supply step of supplying recycled polyethylene terephthalate partially drawn yarn (PET) and recycled polyethylene terephthalate (PET)/polytrimethylene terephthalate (PTT) latent crimp yarn to GR ₁ ;
A heat treatment step of processing the supplied yarn in a contact heater and a non-contact heater;
Air entangling step of braiding the heat-treated yarn through air entangling with an air nozzle; and
Including a winding step of winding the air-entangled latent crimped composite yarn,
The method of manufacturing a highly elastic recycled PET/PTT latent crimping composite yarn with excellent deep color, characterized in that the air nozzle in the air entanglement step is a tandem nozzle having two or more air discharge holes.
The method of claim 1,
In the heat treatment step, the temperature of the contact heater is 110 ~ 125 ℃, and the temperature of the non-contact heater is 190 ~ 210 ℃ The method of manufacturing a highly elastic recycled PET / PTT latent crimp composite yarn excellent in deep color, characterized in that.
The method of claim 1,
The air pressure of the air nozzle of the air entanglement step is 1.2 ~ 3.5kgf / cm ² , The diameter of the air discharge hole is 0.8 ~ 1.2mm High elasticity recycled PET / PTT latent crimping composite yarn with excellent deep color, characterized in that the manufacturing method.
delete A highly elastic recycled PET/PTT latent crimp composite yarn having excellent deep color properties manufactured by the manufacturing method of any one of claims 1 to 3.
A fabric manufactured using the highly elastic recycled PET/PTT latent crimped composite yarn with excellent deep color of claim 5.

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