KR102506465B1 - Eco-friendly, highly elastic recycled polyester-based latent crimped yarn manufacturing method and fabric using the same - Google Patents

Abstract

Preparation step of partially drawn recycled polyester yarn having a fineness of 70 to 90 De'; Fineness 30 ~ 50De' polyester / polytrimethylene terephthalate (PTT) latent crimp yarn preparation step; A yarn supply step of supplying recycled polyester partially drawn yarn and polyester/polytrimethylene terephthalate (PTT) latent crimped yarn to GR ₁ ; Heat treatment step of processing the supplied yarn in a contact heater and a non-contact heater; An air entanglement step of plying the heat-treated yarn through air entanglement with an air nozzle; and a winding step of winding the air-interwoven latent crimp composite yarn.
According to the present invention, while plying eco-friendly highly elastic recycled polyester latent crimp composite yarns, multi-stage heat treatment and air entanglement are formed using an air nozzle having a plurality of air outlets, thereby increasing the blended yarn and improving workability in the production process. this improves
The eco-friendly high-stretch recycled polyester latent crimp composite yarn according to the present invention can be manufactured with a composite yarn having various mixed fineness on the surface of the yarn, so that a fabric with excellent elasticity can be manufactured with a natural effect.

Description

Eco-friendly, highly elastic recycled polyester-based latent crimped yarn manufacturing method and fabric using the same

The present invention combines recycled polyester partially drawn yarn (POY) and polyester/polytrimethylene terephthalate (PTT) latent crimping yarn, and highly elastic polyester/PTT latent crimping yarn in which recycled polyester partially drawn yarn is exposed to the surface as an effect yarn. It's about composites. By drawing polyester partially drawn yarn and polyester/PTT latent crimping yarn and forming multi-stage heat treatment and air entanglement, natural emotion expression differentiated from existing conjugate yarn is expressed, and elasticity is excellent when weaving fabric using this, and after dyeing Cardiochromic expression is possible.

In the apparel industry, the core of product planning is changing to efficiently reflect and satisfy the complex and dynamic emotions of consumers by harmonizing materials and styles. It is not an exaggeration to say that the selection of materials determines the sales of a product because the overall quality is determined through the interaction with other factors in the final product. Therefore, in order to more accurately reflect the delicate emotional needs of consumers in product planning, an integrated study on the factors that can affect the image of fashion materials is needed.

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

Adidas, a world-renowned brand, introduced running shoes using plastic waste collected from the ocean in collaboration with Palli for the Oceans, a marine environmental protection organization. We believe that has the great power to make a difference,” and announced that by 2024, all footwear and clothing will be made from environmentally friendly materials made from recycled waste plastic instead of polyester.

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

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, the recycled polyester used in the present invention is material recycling, which is recycled by refining raw materials from waste materials recovered from waste materials or previously used products during the polyester manufacturing process, then melting and spinning, and recovered raw materials. 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.

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

In the present invention, latent crimp yarns prepared by conjugate spinning of polyester and polytrimethylene terephthalate (PTT) in a side-by-side type (Side By Side) and latent crimp yarns produced by composite processing of recycled polyester partially drawn yarns. is a composite The latent crimp composite yarn thus prepared has elasticity similar to that of spandex yarn in the fabric while expressing the feel and appearance of natural fibers, so that when a knitted fabric using the same is manufactured, it is knitted while having appropriate elasticity and stretch recovery as a material for clothing It is intended to provide a method for producing latent crimped composite yarn with low defect rate and dyeing defect rate and excellent deep color property by allowing polyester partially drawn yarn to protrude on the surface.

In addition, through multi-stage heat treatment of the supplied yarns, the mixing (migration) effect between the yarns is enhanced to improve the color depth, and the air entanglement effect is maximized by optimizing the diameter, number and pressure of the air nozzle outlets to increase the mixed fineness. Its purpose is to provide a method for producing eco-friendly high-stretch recycled polyester-based latent crimp composite yarn with excellent deep colorability.

In order to achieve the above object, the present invention provides a recycled polyester partially drawn yarn having a fineness of 70 to 90 De'; Fineness 30 ~ 50De' polyester / polytrimethylene terephthalate (PTT) latent crimp yarn preparation step; A yarn supply step of supplying recycled polyester partially drawn yarn and polyester/polytrimethylene terephthalate (PTT) latent crimped yarn to GR ₁ ; Heat treatment step of processing the supplied yarn in a contact heater and a non-contact heater; An air entanglement step of plying the heat-treated yarn through air entanglement with an air nozzle; and a winding step of winding the air-interwoven latent crimp composite yarn.

In addition, in the heat treatment step, the temperature of the contact heater is 120 to 130 ° C, and the temperature of the non-contact heater is 190 to 210 ° C.

In addition, the air pressure in the air bridging step is 1.0 to 2.0 kgf/cm ² , and the diameter of the air discharge hole is 1.0 to 1.6 mm.

The air nozzle in the air bridging step provides a method for manufacturing an eco-friendly highly elastic recycled polyester latent crimp composite yarn, characterized in that the air nozzle is a tandem nozzle having two or more air discharge holes.

On the other hand, an eco-friendly high-stretch recycled polyester-based latent crimp composite yarn manufactured by the above manufacturing method is provided.

Thus, a fabric manufactured using the eco-friendly highly elastic recycled polyester latent crimp composite yarn is provided.

According to the present invention, while plying eco-friendly high-stretch recycled polyester latent crimp composite yarns, multi-stage heat treatment and air entanglement are formed using an air nozzle having a plurality of air outlets, thereby increasing the combined yarn fineness and improving workability in the production process. this improves

The eco-friendly high-stretch recycled polyester latent crimp composite yarn according to the present invention can be manufactured with a composite yarn having various mixed fineness on the surface of the yarn, so that a fabric with excellent elasticity can be manufactured with a natural effect.

In addition, by sequentially performing heat treatment while passing through a contact heater and a non-contact heater, problems such as change in elongation and shrinkage rate according to post-production process conditions, resulting in whiteness difference, weaving breakage, weaving, and weaving defects were significantly reduced.

1 is a schematic view of an apparatus for manufacturing an eco-friendly high-stretch recycled polyester-based latent crimp composite yarn according to the present invention.
2 is a manufacturing process diagram of the eco-friendly highly elastic recycled polyester-based latent crimp composite yarn according to the present invention.
3 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 of all, it should be noted that in the drawings, the same components or parts are denoted by the same reference numerals as much as possible. 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.

The terms 'about', 'substantially', and the like as used in the specification of the present invention are used in a sense at or close to that number when manufacturing and material tolerances inherent in the stated meaning are given, and the meaning of the present invention For the sake of understanding, exact or absolute figures are used to prevent infringers from unfairly using the mentioned disclosure.

1 is a schematic diagram of an apparatus for manufacturing an eco-friendly highly elastic recycled polyester latent crimp composite yarn according to the present invention, and FIG. 2 is a manufacturing process diagram of an eco-friendly highly elastic recycled polyester latent crimp composite yarn according to the present invention.

The eco-friendly high-elasticity recycled polyester latent crimped composite yarn according to the present invention is manufactured by plying recycled polyester partially drawn yarn and polyester/PTT latent crimped yarn, heat treatment, and air entanglement.

As shown in FIGS. 1 and 2, in the step of preparing the recycled polyester partially drawn yarn (S10), the recycled polyester partially drawn yarn 10 manufactured to a size of 70 to 90De' is prepared in creel.

The recycled polyester partially drawn yarn is manufactured according to a known manufacturing method in which waste polyester is collected according to a known manufacturing process, foreign substances are separated, wet grinding, classification, wet grinding, and fractionation are made into chips for spinning. 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., and yarn cutting and quality defects can be prevented by spinning at a lower spinning temperature. , the increase in the spinning pressure over the spinning time can be delayed by strengthening the pack filtration conditions.

The latent crimping yarn preparation step (S20) is a PET/PTT latent crimping yarn 20 prepared by composite spinning of polyester and polytrimethylene terephthalate (PTT) in a side-by-side type. Prepare latent crimped yarn with a fineness of 30 to 50 De'. The polyester/PTT latent crimped yarn 20 prepared in this way is a fiber to which elasticity is imparted by applying heat after conjugate spinning to form a physical coil due to a difference in heat shrinkage.

The yarn supply step (S30) is a step of supplying the recycled polyester partially drawn yarn 10 and the polyester/polytrimethylene terephthalate (PTT) latent crimped yarn 20 to GR ₁ (40). Each yarn loaded on the creel is supplied to GR ₁ with a constant tension via the Nip Roller (30). As shown in FIG. 1 and the description of the symbols, GR is an abbreviation of Godet Roller and is generally applied to the drawing and winding steps in the melt spinning process of synthetic fibers, or for the drawing action of a drawing device. GR is generally composed of a pair of GR ₁ (40) and GR ₂ (70). GR ₁ is generally slow and GR ₂ is fast, so the difference in linear speed between these two rollers causes the stretching action. this is done

The heat treatment step (S40) 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 PET/PTT latent crimped yarn 20 passing through GR ₁ (40) are subjected to primary heat treatment while passing through the contact heater 50. At this time, the first heat treatment temperature is 120 ~ 130 ℃.

When the heat treatment temperature is lower than 120 ° C, many defects of wool or pim yarn occur on the surface of the latent crimped composite yarn, and when the heat treatment temperature exceeds 130 ° C, the workability is extremely deteriorated and the tactile feel of the manufactured fabric is reduced. Harsh is not desirable.

The yarn that has undergone the first heat treatment process is heat treated once again while passing through the non-contact heater 60 once again. As the second heat treatment is performed, more stable heat setting is performed, and thus the eco-friendly highly elastic recycled polyester latent crimp composite yarn produced is stabilized by reducing the change with time, thereby preventing the occurrence of defects in the weaving and dyeing processing process. At this time, the heat treatment temperature is preferably made at 190 ~ 210 ℃.

If the secondary heat treatment temperature is less than 190 ° C., the elasticity and workability of the composite yarn become poor. This is identified as the cause of the poor mixed fineness of the recycled polyester partially drawn yarn acting as an effect yarn due to insufficient heat treatment. In addition, when the temperature exceeds 210 ° C., the problem of touch failure of single yarn, yarn cutting, and fabric increases. This is judged to be due to the decrease in elongation due to excessive heat setting and the increase in yarn tension.

The air entanglement step (S50) is a step of plying the drawn and non-contact heat treated recycled polyester partially drawn yarn 10 and the polyester/PTT latent crimped yarn 20 through air entanglement, and an air nozzle for air entanglement ( 80). In the air entanglement step (S40), the air nozzle 80 is placed between the GR ₂ (70) and the linear speed control roller (not shown) to minimize the tension applied to the yarn due to the speed difference on the yarn, so that the yarn is is formed

The linear speed control roller is obtained by cutting a part of the surface (1/2 of the roller width) of GR ₂ (70) using a cutting tool, and the diameter of the cutting part of GR ₂ (70) is reduced, and the linear speed The linear speed of the composite yarn passing through the control roller is reduced (such an overfeed according to GR ₂ and the linear speed control roller is according to the configuration of prior patent registration number 10-19388838 of the present applicant).

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

On the other hand, between GR ₁ (40) and GR ₂ (70), a draw ratio of 1.10 to 1.15 is applied, and the final fineness of the eco-friendly high-stretch recycled polyester latent crimp composite yarn is manufactured to have a range of 90 to 125 De'.

Air bridging was provided by supplying air within 1.0 to 2.0 kg/m ² from the air nozzle 80 in the air bridging step (S50), and the diameter of the air discharge hole of the air nozzle was 1.0 to 1.6 mm. The air nozzle 80 used can be selected from a general type and a tandem type. The tandem type has two or more holes through which air is discharged from the nozzle formed on the four sides, It is a nozzle that has never been used in a yarn processing machine. In order to use a tandem-type air nozzle in the composite yarn processing device, the present applicant modified 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 mixed fineness by supplying air of varying pressure.

The number of air bridging formed thereby is 30 to 60 bridging per meter. As described above, the appearance of the eco-friendly highly stretchable recycled polyester latent crimped composite yarn produced by the air nozzle 80 pressure varying in the range of 1.0 to 2.0 kg/m ² is exposed to the recycled polyester partially drawn yarn on the surface of the latent crimped yarn. As it has an appearance of a shape to be manufactured, the elasticity of the knitted fabric to be manufactured is improved, and it has a soft touch, a sense of volume, and excellent deep color.

In the winding step (S60), the recycled polyester/PTT latent crimped composite yarn with air entanglement is wound around the winder at a speed of 500 to 800 m/m, and prepared for use in the subsequent post-processing and knitting process. In the present invention, the eco-friendly high-stretch recycled polyester latent crimp composite yarn is wound around a bobbin through a twisting process for imparting twist within a range of 600 to 2000TM to manufacture yarn for fabric production.

The eco-friendly high-stretch recycled polyester latent crimp composite yarn according to the present invention has a high shrinkage rate due to the difference in shrinkage after dyeing, so it forms the screening portion of the composite yarn and recycled poly having a relatively low shrinkage rate. The ester partially drawn yarn protrudes to the surface while showing the maximum amount of bending characteristics, exhibiting excellent touch and natural characteristics, and exhibits excellent elasticity after dyeing.

The eco-friendly highly elastic recycled polyester latent crimp composite yarn of the present invention is prepared as a yarn for fabric manufacturing through a twisting process for imparting twist within the range of 600 to 2000TM. A fabric prepared by weaving or knitting using the twisted yarn as a warp or weft yarn is applied to fabric by applying a conventional polyester dyeing method in which a fabric manufactured by weaving or knitting 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 fabric or knitted fabric thus dyed exhibits excellent touch due to the effect of air entanglement imparted to the latent crimped composite yarn in the air entanglement step (S50) and the polyester partially drawn yarn protruding on the surface.

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 1~3>

Recycled polyester partially drawn yarn (POY) 10 having a fineness of 80De' was prepared on a yarn supply creel, and polyester/PTT latent crimped yarn 20 having a fineness of 30De' was stacked on another creel to prepare a supply yarn. .

80De' recycled polyester partially drawn yarn (10) and 30De' polyester/PTT latent crimped yarn (20) are supplied to GR ₁ (40) through the Nip Roller (30) and passed through the contact heater (50). Heat treatment was performed.

The heat treatment temperature of the contact heater 50 was divided into three sections of 100 to 110 ° C, 110 to 120 ° C, and 120 to 130 ° C, and the workability and elasticity of the composite yarn were compared. The air pressure for air bridging was controlled at 1.0 to 2.0 kgf/cm ² , the diameter of the air discharge hole of the air nozzle was 1.6 mm, and the air bridging was performed, and the air bridging was performed at a speed of 600 m/m, resulting in a total of 95 to 105 A denier, eco-friendly, high-stretch, recycled polyester-based latent crimp composite yarn was prepared. The production conditions and characteristics evaluation results are shown in Table 1.

< Experimental example >

(One) Honseomdo evaluation

Mixed yarn is a measure of the number of mixed fibers per 1 m of the composite yarn, and indicates the uniform degree of mixed fibers of the two materials. In addition, as a method for measuring mixed fiber, water was put in a square tank, and after floating composite yarn on the water surface, the number of mixed fibers with a length of 1 m was measured. It was marked as excellent (◎) when the blended fiber per 1m was 60 or more, good ( ○ ) when the level was 45 to 60, normal ( Δ) when the level was 30 to 40, and bad ( × ) when the number was less than 30.

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

( 2) Workability evaluation

The workability evaluation was conducted by mutual comparison by 5 experts, and a score of 1 point to 5 points for excellent was given, and the average score was 5 points excellent (◎), 3 to 4 points good ( ○ ), and 2 points. Normal ( Δ) , and less than 2 points were marked as defective ( × ).

(3) Elasticity of the fabric

The elasticity of the fabric was measured 10 times by the measurement method of KSK 0352 5.2.2.

[Table 1]

In Examples 1 to 3, which were conducted under different heat treatment conditions of the contact heater, it was found that the mixed fiber and elasticity were excellent at a heat treatment temperature of 120 to 130 ° C. It is judged that the elasticity is improved as the crystallinity is improved.

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

Claims (6)

Preparation step of partially drawn recycled polyester yarn having a fineness of 70 to 90 De';
Fineness 30 ~ 50 De' polyester / polytrimethylene terephthalate (PTT) latent crimp yarn preparation step;
A yarn supply step of supplying recycled polyester partially drawn yarn and polyester/polytrimethylene terephthalate (PTT) latent crimped yarn to GR ₁ (40);
Heat treatment step of processing the supplied yarn in a contact heater and a non-contact heater;
An air entanglement step of plying the heat-treated yarn through air entanglement with an air nozzle; and
Including a winding step of winding the air entangled latent crimped composite yarn,
The air nozzle in the air bridging step is a tandem nozzle having two or more air discharge holes.
According to claim 1,
In the heat treatment step, the temperature of the contact heater is 120 to 130 ° C, and the temperature of the non-contact heater is 190 to 210 ° C.
According to claim 1,
The air pressure of the air nozzle in the air bridging step is 1.0 to 2.0 kgf / cm ² , and the diameter of the air discharge hole is 1.0 to 1.6 mm.
delete An eco-friendly high-stretch recycled polyester-based latent crimp composite yarn produced by the manufacturing method of any one of claims 1 to 3.
A fabric manufactured using the eco-friendly high-stretch recycled polyester-based latent crimp composite yarn of claim 5.

Images