KR102506468B1 - Manufacturing method of elastic high strength recycled polyethylene (rHTPE)/polyester -based latent crimped composite yarn and fabric using the same - Google Patents

Abstract

The present invention recycles waste materials of ultra-high molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE) used for industrial purposes to produce ultra-high-strength polyethylene yarn (rHTPE), and produces polyester polymers or two-component polyester polymers with different viscosities. It is a stretchable latent crimped composite yarn manufactured by composite processing with polyester latent crimped yarn manufactured by composite spinning in a side-by-side type.
The stretchable latent crimp composite yarn thus prepared has elasticity similar to that of spandex yarn in the fabric, but has high strength, light weight, resistance to seawater, and abrasion resistance, thereby providing wear convenience, functionality, and sensibility suitable as a sportswear material.

Description

Manufacturing method of elastic high strength recycled polyethylene (rHTPE)/polyester-based latent crimped composite yarn and fabric using the same}

The present invention combines recycled high-strength polyethylene (rHTPE) fibers and polyester-based latent crimping yarns so that the recycled high-strength polyethylene (rHTPE) is exposed on the surface of the composite yarns to have high strength characteristics and durability, while increasing elasticity by the latent crimping yarns inside. It relates to a method for manufacturing composite yarn. By composite drawing of recycled high-strength polyethylene (rHTPE) with polyester latent crimp yarns, multi-stage heat treatment, and air entanglement, conjugate yarns with excellent surface strength and elasticity differentiated from existing conjugate yarns are manufactured, and fabrics can be woven using this. In some cases, it has excellent elasticity and can supply fabric that can be used for safety clothing.

Among the apparel industry, underwater and aquatic leisure sports products protect the human body’s physiological functions in emergency situations that occur on the water and underwater, and maximize the maintenance of body temperature (Warmth) and activity (Comfort) in the water by minimizing damage. for complex functions.

Due to the recent expansion of water park facilities and the expansion of the base of water sports such as rafting, skin scuba diving, and water skiing, interest in related products such as swimwear and diving suits is rapidly increasing. ), and is growing rapidly at 10% annually.

However, the current domestic underwater and water leisure sports product industry is a high value-added industry, and market preoccupation and large-scale competition are fierce. There is an urgent need to secure domestic technology and product competitiveness.

In the present invention, recycled high-strength polyethylene (rHTPE) fibers and polyester-based latent crimped yarns are conjugated to develop products with price competitiveness while expressing human body protection, body temperature maintenance, and emotional complex functions in line with the trend of underwater and water leisure sports products. and multi-stage heat treatment to produce a composite yarn. The composite yarn manufactured in this way is an eco-friendly material and can be used as a fabric for wetsuits, rash guards, and life jackets that can maximize activity under water and aquatic environmental conditions.

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.

In addition, recycled high tenacity polyethylene (rHTPE) used in the present invention is ultra high molecular weight polyethylene (UHMWPE) that is used again after refining raw materials from waste materials recovered from waste materials or previously used products during the manufacturing process. , It is a recycled fiber material manufactured by mixing high density polyethylene (HDPE) and virgin high density polyethylene according to the required physical properties of the safety clothing of the present invention.

In addition, recycled high-strength polyethylene yarn (rHDPE) is a fiber produced by melting and spinning by mixing the above recycled ultra-high molecular weight polyethylene (rUHMWPE), recycled high-density polyethylene (rHDPE) and new high-density polyethylene (vHDPE) in a constant ratio.

Korean Patent Publication No. 10-2020-0023191 describes a method for preparing recycled high-density polyethylene by mixing waste high-density polyethylene (rHDPE) and new high-density polyethylene (vHDPE) in a constant ratio and melt-mixing together with a peroxide crosslinking agent.

Korean Registration No. 10-2061759 Korean Publication No. 10-2020-0023191

The present invention recycles waste materials of ultra-high molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE) used for industrial purposes to produce ultra-high-strength polyethylene yarn (rHTPE), and produces polyester polymers or two-component polyester polymers with different viscosities. It is a stretchable latent crimped composite yarn manufactured by composite processing with polyester latent crimped yarn manufactured by composite spinning in a side-by-side type.

The stretchable latent crimp composite yarn thus prepared has elasticity similar to that of spandex yarn in the fabric, but has high strength, light weight, resistance to seawater, and abrasion resistance, thereby providing wear convenience, functionality, and sensibility suitable as a sportswear material.

In addition, the uniformity is improved by increasing the migration effect between the yarns through multi-stage heat treatment for the supplied yarns, and the air entanglement effect is maximized by controlling the air nozzle outlet diameter and winding speed to improve the blended fineness. Its purpose is to provide a method for manufacturing recycled high-strength polyethylene (rHTPE)/polyester latent crimp composite yarn with improved elasticity and excellent elasticity.

In order to achieve the above object, the present invention is a step of preparing recycled high-strength polyethylene yarn (rHTPE) having a fineness of 70 to 90 De', a step of preparing a polyester latent crimped yarn having a fineness of 30 to 50 De', a recycled high-strength polyethylene yarn (rHTPE) and Yarn supply step of supplying polyester-based latent crimped yarn to GR ₁ , heat treatment step of treating the supplied yarn with a contact heater and non-contact heater, air entanglement step of plying the heat-treated yarn through air entanglement with an air nozzle, and air Provided is a method for producing a stretchable recycled high-strength polyethylene (rHTPE)/polyester latent crimp composite yarn, comprising a winding step of winding the entangled latent crimp composite yarn.

In addition, the recycled high-strength polyethylene yarn (rHTPE) is stretchable, characterized in that recycled ultra-high molecular weight polyethylene (rUHMWPE), recycled high-density polyethylene (rHDPE), and new high-density polyethylene (vHDPE) are mixed in a combination of 10:10:80 in weight ratio Provided is a method for producing recycled high-strength polyethylene (rHTPE)/polyester-based latent crimp composite yarn.

In addition, the air pressure in the air bridging step is 3.0 to 3.5 kgf / cm ² , and the diameter of the air discharge hole is 1.6 to 2.0 mm, characterized in that the manufacturing method of stretchable recycled high-strength polyethylene (rHTPE) / polyester latent crimp composite yarn to provide.

Provides a manufacturing method of stretchable recycled high-strength polyethylene (rHTPE) / polyester latent crimp composite yarn, characterized in that the yarn speed in the winding step is 200 ~ 400m / min, and has a strength of 12 ~ 14g / De and a fineness of 100 ~ 140De do.

On the other hand, a stretchable recycled high-strength polyethylene (rHTPE)/polyester-based latent crimp composite yarn manufactured by the above manufacturing method is provided.

Provided is a fabric manufactured using the stretchable recycled high-strength polyethylene (rHTPE)/polyester-based latent crimp composite yarn thus prepared.

According to the present invention, while plying high-strength polyethylene (rHTPE)/polyester-based latent crimp composite yarns, multi-stage heat treatment and air entanglement are formed using an air nozzle having an air outlet designed to suit the characteristics of the yarn, thereby increasing the mixed fiber of the composite yarn. and workability is improved in the production process.

The high-strength polyethylene (rHTPE)/polyester-based latent crimp composite yarn according to the present invention exhibits excellent elasticity while exhibiting strength and heat retention suitable for swimwear, rash guards, and wetsuits because the high-strength recycled high-strength polyethylene yarn (rHTPE) is exposed on the surface of the yarn. It is possible to manufacture a fabric that exhibits.

In addition, by sequentially performing heat treatment while passing through a contact heater and a non-contact heater, changes in elongation and shrinkage rate according to post-production process conditions, resulting in whiteness difference, weaving breakage, weaving, and weaving defects can be significantly reduced. there is,

1 is a schematic view of an apparatus for manufacturing a stretchable recycled high-strength polyethylene (rHTPE)/polyester latent crimp composite yarn according to the present invention.
2 is a manufacturing process diagram of the stretchable recycled high-strength polyethylene (rHTPE)/polyester-based latent crimp 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. 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 a manufacturing apparatus for a stretchable recycled high-strength polyethylene (rHTPE)/polyester latent crimp composite yarn according to the present invention, and FIG. 2 is a manufacturing apparatus for a stretchable recycled high-strength polyethylene (rHTPE)/polyester latent crimp composite yarn according to the present invention. It is also fair.

The stretchable recycled high-strength polyethylene (rHTPE)/polyester latent crimped composite yarn according to the present invention is manufactured by plying and stretching recycled high-strength polyethylene (rHTPE) and polyester latent crimped yarn, followed by heat treatment and air entanglement.

As shown in FIGS. 1 and 2, the recycling high-strength polyethylene (rHTPE) preparation step (S10) having a fineness of 70 to 90De' is a recycled high-strength polyethylene yarn (rHTPE) 10 manufactured to the standard of fineness of 70 to 90De'. ) is a preparation step for loading.

The recycled high-strength polyethylene yarn (rHTPE) collects waste ultra-high molecular weight polyethylene (UHMWPE) or discarded high-density polyethylene (HDPE) discarded in a known manufacturing process, separates and removes paraffin oil and foreign substances, and wet-grinds, fractionates, wet-grinds, It is used that is manufactured according to a known manufacturing method that is manufactured into chips for spinning through fractionation.

The recycled high-strength polyethylene yarn (rHTPE) in the present invention is a masterbatch chip manufactured by mixing recycled ultra-high molecular weight polyethylene (rUHMWPE), recycled high-density polyethylene (rHDPE), and new high-density polyethylene (vHDPE) at a constant weight ratio as raw materials. It is a high-strength polyethylene yarn (rHTPE) produced by spinning.

In order to manufacture such recycled high-strength polyethylene yarn (rHTPE), the melt index, which affects melt spinning performance, varies according to the mixing ratio of raw materials, and accordingly, the temperature, pressure, odd number of spinning nozzles, L /D should be controlled sensitively. In addition, the manufactured high-strength polyethylene yarn (rHTPE) should be able to exhibit sufficient strength, elongation, shape stability, and chemical resistance to be used for swimwear, rash guards, wetsuits, and life jackets.

If the content of recycled ultra-high molecular weight polyethylene (rUHMWPE) is 10% by weight or more, the spinning pressure rises rapidly, or spinning is not easy due to single yarn breaks, and the content of recycled high-density polyethylene (rHDPE) exceeds 10% by weight Although there is an advantage in the spinning process, the recycled high-strength polyethylene yarn (rHTPE) produced does not express sufficient strength for the purpose of use.

Considering numerous spinning process tests and physical properties of recycled high-strength polyethylene yarn (rHTPE) manufactured, the weight ratio of recycled ultra-high molecular weight polyethylene (UHMWPE): recycled high-density polyethylene (rHDPE): new high-density polyethylene (vHDPE) is a combination of 10:10:80 It is preferable to use it by mixing to prepare a chip for spinning. At this time, the spinning temperature was 250 ~ 300 ℃, the spinning speed was 200 ~ 250m / min, and the recycled high-strength polyethylene yarn (rHTPE) produced had a fineness of 70 ~ 90De' and a strength of 12 ~ 16g / De, so the present invention of the stretchable composite yarn could exhibit physical properties suitable for the use.

The polyester-based latent crimping yarn preparation step (S20) of 30 to 50 De' fineness is a combination of high-viscosity polyester and relatively low-viscosity polyester in a known side-by-side type. It may be a polyester-based latent crimped yarn produced by spinning. Alternatively, a polyester-based latent crimped yarn prepared by a known side-by-side composite spinning method of polyester and heterogeneous polyester-based polymers such as polytrimethylene terephthalate (PTT) may be used. there is.

As the polyester-based latent crimped yarn 20, a latent crimped yarn having a fineness of 30 to 50 De' is prepared. The polyester-based 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 high-strength polyethylene yarn (rHTPE) 10 and the polyester-based 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 high-strength polyethylene yarn (rHTPE) 10 and the Lisa polyester-based latent crimped yarn 20 passing through the 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 110 ~ 125 ℃.

When the heat treatment temperature is lower than 110 ° 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 125 ° 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 it goes through the secondary heat treatment, more stable heat setting is achieved, so that the manufactured stretchable recycled high-strength polyethylene (rHTPE)/polyester latent crimp composite yarn is reduced and stable with time, preventing defects in the weaving and dyeing processing process. can At this time, the heat treatment temperature is preferably made at 190 ~ 210 ℃.

The air entanglement step (S50) is a step of plying the drawn and non-contact heat treated recycled high-strength polyethylene yarn (rHTPE) 10 and the polyester 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.

Air bridging was provided by supplying air within 3.0 to 3.5 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 1.6 to 2.0 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 40 to 60 bridging per meter. As such, the appearance of the stretchable recycled high-strength polyethylene (rHTPE) / polyester-based latent crimping composite yarn by the air nozzle 80 pressure varying in the range of 3.0 ~ 3.5kgf / cm ² is the recycled high-strength polyethylene (rHTPE) on the surface of the latent crimping yarn. ) is exposed, and the polyester latent crimped yarn is located on the central axis. While having such a form of appearance, the elasticity of the knitted fabric or fabric to be manufactured is improved, and it has excellent physical properties, chemical resistance, warmth and volume, and excellent sensibility.

In the winding step (S60), the elastic recycled high-strength polyethylene (rHTPE)/polyester-based latent crimp composite yarn with air entanglement is wound around the winder at a speed of 200 to 800 m/m, preparing it for use in the subsequent post-processing and knitting process. . In the present invention, the stretchable recycled high-strength polyethylene (rHTPE)/polyester-based latent crimp composite yarn is wound around a bobbin through a twisting process of imparting twist within a range of 600 to 2000TM to manufacture yarn for fabric production.

The stretchable recycled high-strength polyethylene (rHTPE)/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 has a relatively high shrinkage rate. Low recycled high-strength polyethylene yarn (rHTPE) protrudes on the surface while showing maximum flexural properties, exhibiting excellent mechanical properties and natural properties, and exhibits excellent elasticity after dyeing.

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>

Recycled high-strength polyethylene yarn (rHTPE) (10) with a fineness of 75De' is prepared on a yarn supply creel, and a side-by-side type of two-component (PET/PTT) with a fineness of 30De' is prepared by composite spinning. The prepared polyester-based latent crimped yarn 20 was stacked on another creel to prepare a source yarn.

75De' recycled high-strength polyethylene yarn (rHTPE) (10) and 30De' polyester-based latent crimp yarn (20) are supplied to GR ₁ (40) through a Nip Roller (30), and a contact heater (50) and a non-contact heater Heat treatment was performed while passing through.

The air pressure for air bridging was controlled at 3.0 to 3.5 kgf/cm ² , and the winding speed was wound at a speed of 600 to 800 m/m, respectively, to obtain a recycling high strength polyethylene (rHTPE)/polyester potential of 105 De'. A crimped composite yarn was prepared.

< Example 2 to 4>

In Examples 2 to 4, the winding speed was set to 400 to 600 m/min, 200 to 400 m/min, and 200 m/min or less, respectively, to compare the fineness and workability, and other production conditions were set the same. The results according to it are shown in [Table 1].

[Table 1]

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.

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 ( × ).

The slower the winding speed, the better the mixed fineness, and the workability did not cause thread breakage or poor appearance even when the winding speed was 600 m/min or more. Since the mixed fineness and workability show opposite characteristics depending on the winding speed, the production conditions of Example 3 were judged to be relatively the best when considering the strength characteristics in consideration of the future application of the yarn.

< Example 5~7>

In Examples 5 to 7, the mixed fineness was compared while changing the diameter of the air nozzle for air entanglement in the range of 1.6 to 2.0 mm in the production conditions of Example 3.

[Table 2]

The mixed fineness was varied according to the diameter of the air outlet of the air nozzle, and the mixed fineness was evaluated to be the best in Example 7 in which the diameter of the discharge hole was 2.0 mm.

10: recycled high-strength polyethylene yarn (rHTPE)
20: polyester 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)

Recycled high-strength polyethylene yarn (rHTPE) preparation step with a fineness of 70 to 90 De';
Fineness 30 ~ 50 De' polyester latent crimp yarn preparation step;
A yarn supply step of supplying recycled high-strength polyethylene yarn (rHTPE) and polyester latent crimp yarn to GR ₁ (40);
A 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 conjugated yarn,
The yarn speed of the winding step is 200 ~ 400m / min, strength 12 ~ 14g / De, stretchable recycled high-strength polyethylene (rHTPE) / polyester-based latent crimp composite yarn manufacturing method, characterized in that it has a fineness of 100 ~ 140De.
According to claim 1,
The recycled high-strength polyethylene yarn (rHTPE) is a combination of recycled ultra-high molecular weight polyethylene (rUHMWPE): recycled high-density polyethylene (rHDPE): new high-density polyethylene (vHDPE) in a weight ratio of 10: 10: 80 Manufacturing method of polyethylene (rHTPE)/polyester latent crimp composite yarn.
According to claim 1,
The air pressure of the air nozzle in the air bridging step is 3.0 to 3.5 kgf / cm ² , and the diameter of the air discharge hole is 1.6 to 2.0 mm. Method for manufacturing stretchable recycled high-strength polyethylene (rHTPE) / polyester latent crimp composite yarn, characterized in that .
delete A stretchable recycled high-strength polyethylene (rHTPE)/polyester latent crimp composite yarn prepared by the manufacturing method of any one of claims 1 to 3.
A fabric manufactured using the stretchable recycled high-strength polyethylene (rHTPE)/polyester latent crimp composite yarn of claim 5.

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