KR102415128B1 - Process Of Producing Recycled―Polyester DTY Yarn Having Excellent Strength And Elongation - Google Patents

Abstract

The present invention relates to a method for providing a twisted composite yarn having excellent tensile strength and elongation through yarn processing using recycled polyester filaments recycled from waste plastic bottles. It can be used for existing textile materials for clothing and daily life, and in particular, because its elongation is higher than that of general DTY, it can be used for sportswear and yoga clothes that require elasticity.

Description

Manufacturing Method of Recycled Polyester Twisted Composite Yarn with Excellent Elongation {Process Of Producing Recycled—Polyester DTY Yarn Having Excellent Strength And Elongation}

The present invention relates to a method of providing a twisted composite yarn having excellent tensile strength and elongation through yarn processing using recycled polyester filaments recycled from waste plastic bottles.

Plastic products that used to be used for the convenience of life are now the main culprits of environmental destruction. Plastics, including PET bottles, account for 12% of the garbage we produce today. There is a floating plastic island, and in the case of Korea, there is a case of illegally entering a port of plastic into the Philippines and then returning it again. It is becoming.

Global plastic production has increased by 42% over the past decade, reaching 384 million tons in 2017, and the amount of plastic discarded reached about 244 million tons as of 2016, and plastics are the main waste that threatens the global environment Since 2015, more and more places have imposed strong legal environmental regulations such as restrictions on plastic usage or production suspension internationally, and Korea is also gradually increasing the scope of restrictions on plastic use.

In Korea, the use of disposable products in food service establishments and large marts is prohibited in accordance with Article 10 of the Act on the Promotion of Saving and Recycling of Resources. provision is prohibited. In addition to legal restrictions, there is a growing movement to reduce the use of disposables by the people themselves, such as the use of shopping carts and tumblers.

In response, the global textile and fashion industry wants to develop, produce, and sell waste plastics into textiles by reprocessing them into textiles as part of a 'recycling platform' to actively solve environmental problems. After that, an international certification is created so that it can be continuously managed.

The textile market, centered on Europe and the United States, is demanding the production of products that meet global eco-friendly standards. (Recycled Polyester) The usage of the product is gradually increasing, but it is currently used only in the filament or short fiber state, so it is difficult to expand its use to various products. In addition, in manufacturing the twisted composite yarn by yarn processing, it is difficult to exhibit bulkiness and flexibility of the twisted composite yarn due to the rough nature of the surface of the regenerated polyester, so it is only used as a covering yarn.

Republic of Korea Patent Publication No. 10-2011-0116457 (published on October 26, 2011) Republic of Korea Patent Publication No. 10-2015-0134642 (published on December 02, 2015)

Therefore, in the present invention, it is difficult to exhibit bulkiness and flexibility of the combustible composite yarn due to the rough nature of the surface of the regenerated polyester, so that it is used only as a covering yarn. It is a technical task to provide 100% regenerated polyester combustible composite yarn that can be used for yoga clothes, etc.

Therefore, according to the present invention, the regenerated polyester filament is passed through the first feed roller and heat-treated in the first heater at 240 to 270° C. After false-twisting and de-twisting, it is stretched to a draw ratio of 1.65 to 1.75 while passing through the second feed roller, bridging at an air pressure of 1.10 to 1.30 kg/cm2, heat-treated in a secondary heater at 160 to 170° C. There is provided a method for manufacturing a regenerated polyester false twisted composite yarn having excellent elongation, characterized in that it is treated with 0.3 to 0.5% and wound at a yarn speed of 650 to 750 m/min.

Hereinafter, the present invention will be described in detail.

The present invention relates to a method of providing a twisted composite yarn having excellent tensile strength and elongation through yarn processing using recycled polyester filaments recycled from waste plastic bottles.

The recycled polyester filament used as the yarn in the present invention is a recycled polyester filament recycled from a waste plastic bottle, and a recycled polyester filament obtained by melt-spinning a recycled polyester pellet made by crushing and melting a waste PET film or a waste PET bottle is used. do. Regenerated polyester filaments, mainly produced by chemical fiber companies such as Hyosung, Kolon, Huvis, and SM TK Chemical, are imported from Japan and Taiwan and used by melt spinning. This is because Korea does not currently make recycled polyester pellets for clothing (long fiber).

More preferably, it is preferable to use a regenerated polyester filament melt-spun using high-purity regenerated polyester pellets to improve strength, elongation, and evenness. POY 125/72 spun in China (manufacturer) of the recycled polyester filament used in the present invention is used. The regenerated polyester POY company can supply a lot, and it is possible to produce products at a low unit price, and due to the latest spinning equipment, the uniformity of the regenerated polyester filament is good, and it is suitable for improving strength and elongation during combing.

The false twisted composite yarn of the present invention is first passed through the regenerated polyester filament as the yarn through a first feed roller and heat treated in a primary heater at 240 to 270° C. After false twisting in the Z direction, it is drawn at a draw ratio of 1.65 to 1.75 while passing through the second feed roller while unrolling.

The bulkiness of the regenerated polyester is imparted by heat treatment and false twisting in the primary heater. When the first heater temperature is less than 240 ℃, the bulkiness of the false twisted yarn is reduced, and when it is more than 270 ℃, untwisted occurs, which may cause a problem in that the uniformity of the false twisted yarn is lowered or fusion occurs.

The false twisting device used in the present invention is a TMT 384-weight ATF-1500 device, and individual tension can be adjusted. Increases flammability. In addition, as it is directly connected to the suction cooling zone, external damage to the filament is reduced, and the flammability of the filament is increased by heat setting, so it is easy to give bulkiness during false twisting.

In addition, it maintains excellent strength and elongation despite the low oil content compared to the conventional false twisted yarn, thereby providing excellent productivity during weaving or knitting. In addition, if the amount of winding is entered into the program after setting, when the target amount of winding is reached, winding is automatically terminated and discharged, and the next winding can be performed.

After performing the false twist, it passes through the second feed roller, and the filament is drawn by using the speed difference between the first feed roller and the second feed roller. At this time, it is preferable that the draw ratio is 1.65 to 1.75 times. If the draw ratio is less than 1.65 times, untwisted occurs and the uniformity of the false twisted yarn is decreased. It causes problems such as deterioration of workability in the weaving stage.

After the stretching, entangled in the interlace nozzle, 0.3 to 0.5% oil treatment, and winding with a winding roller at a yarn speed of 650 to 750 m/min to complete the false twisted composite yarn of the present invention, the filament passing through the second feed roller is collected After being entangled in the interlace nozzle to improve properties, it is passed through a 2A feed roller, heat treated in a secondary heater at 160 ~ 170° C., passed through a third feed roller, and then wound up after oil treatment. The air pressure during entangling is preferably 1.10 to 1.30 kg/cm2. If the pressure exceeds 1.30 kg/cm2, interlace marks may occur on the surface of the fabric after weaving, and some interlacing marks may appear even after dyeing. 1.1 If it is less than kg/cm2, weaving and weaving properties are slightly lowered during weaving, which may cause weaving defects and weft problems.

It is preferable that the overfeed rate between the second feed roller and the 2A feed roller is 1.6 to 1.8%. If the overfeed rate is less than 1.6%, the interlace marks are generated during weaving because the interlacing becomes thicker in the middle. A problem occurs, and when it exceeds 1.8%, a problem occurs that the bulkiness is lowered.

In the present invention, the bridging is heat treated in a secondary heater at 160 ~ 170℃ after bridging to fix the bridging that can maintain the brittleness by false combustion. When it exceeds 170 ℃, there is a problem that the elongation is lowered.

As such, the most important thing in the twisted composite yarn of the present invention is tensile strength and elongation. Due to the purity of the regenerated polyester filament, which is the yarn, fine residual foreign substances in the pellet can cause radioactive degradation and affect the production of processed yarn after spinning. Since the tensile strength and elongation of the composite yarn may be lowered, the yarn processing conditions must be strictly adhered to as described above.

Thus, according to the present invention, there is provided a recycled polyester twisted composite yarn having excellent physical properties having a fineness of 75d/36~72fila, a strength of 4.00~4.70gf/d, and an elongation of 20~25%.

Therefore, according to the present invention, it is possible to provide a composite yarn having a higher elongation than a general DTY, which can be used for existing textile materials for clothing and daily life. can be used In particular, it is a 100% regenerated polyester combustible composite yarn that can be used as an ITY processing yarn through composite with functional fibers, so the use can be expanded. The scope of use is wide.

1 is a schematic diagram of the manufacturing process of the regenerated polyester false twisted composite yarn of the present invention;
2 is a side micrograph of the regenerated polyester false twisted composite yarn of the present invention;
3 and 4 are physical property test reports of the regenerated polyester twisted composite yarn of the present invention.

The following examples are non-limiting examples of manufacturing the regenerated polyester false twisted composite yarn of the present invention.

[Example 1]

Regenerated polyester filament (YIZHENG made in China) POY 125/72 having the properties shown in Table 1 is passed through the first feed roller according to the conditions in Table 2, and after heat treatment in the first heater, a false twisting device made of a circular PU disk After stretching while passing through the 2nd feed roller while false twisting, it is entangled at the interlace nozzle, passes through the 2nd A feed roller, is subjected to 2nd heat treatment at the 2nd heater, passes through the 3rd feed roller, and is oiled. By winding at a yarn speed of 700 m/min, a twisted composite yarn having the properties shown in Table 3 (#11 in FIGS. 3 and 4) was completed.

physical properties fineness (d) Intensity (gf/d) Elongation (%) 122.8 2.5 133.17

division thread processing conditions draw ratio
(D/R) 1st heater temperature (℃) yarn speed (m/min) overfeed rate
(%) interlace pressure
(kg/㎠) Second heater temperature (℃) Example 1 1.68 260 700 1.7 1.1 165

Composite twisted yarn physical properties fineness
(d/f) burglar
(N) Shinto
(%)
75/72 3.4 23.7

[Comparative Example 1]

General polyester filament (domestic, Hyosung) POY 125de having the properties shown in Table 4 is passed through the first feed roller according to the conditions in Table 5 and heat-treated in the first heater. After stretching while passing through the second feed roller while twisting, the twisted composite yarn (#2 in FIGS. 3 and 4) having the properties shown in Table 6 was obtained by entangling, second heat treatment, oil treatment, and winding at a yarn speed of 700 m/min. completed.

physical properties fineness (d) Intensity (gf/d) Elongation (%) 125.5 2.84 133.5

division thread processing conditions draw ratio
(D/R) 1st heater temperature (℃) yarn speed (m/min) overfeed rate
(%) interlace pressure
(kg/cm2 ) Second heater temperature (℃) Example 1 1.68 260 700 1.7 1.1 165

Composite twisted yarn physical properties fineness
(d/f) burglar
(N) Shinto
(%) 75/72 3.49 19.7

- Physical property evaluation result

; Comparing the yarn tensile strength, as can be seen in FIG. 3 , the DTY 75/72 of Example 1 exhibited 3.40N, and the general DTY 75/72 of Comparative Example 1 showed a similar strength of 3.49N.

; As can be seen in FIG. 4 , the tensile elongation of REC-DTY 75/72 of Example 1 was 23.7%, which was higher than that of general DTY 75/72 of 19.7%.

1: recycled filament 2: krill pipe
3: first feed roller 4: first heater
5: Suction cooling zone 6: DISC type false combustor
7: second feed roller 8: interlace nozzle
9: 2A feed roller) 10: Second heater
11: third feed roller 12: oiling roller
13: winding roller 14: recycled DTY twisted composite yarn

Claims (3)

After passing the regenerated polyester filament through the first feed roller and heat-treating it in the first heater at 240 ~ 270℃, after passing through the suction cooling zone, false-twisting the false twisting direction in the Z-direction with a disk-type twisting device, and then de-twisting After stretching to a draw ratio of 1.65 to 1.75 while passing through 2 feed rollers, entangled in the interlace nozzle at an air pressure of 1.10 to 1.30 kg/cm 2 After making the overfeed rate 1.6~1.8%, heat treatment in the secondary heater at 160~170℃, pass it through the third feed roller, treat the oil at 0.3~0.5%, and roll it at a yarn speed of 650~750m/min. A method for producing a regenerated polyester false twisted composite yarn with excellent elongation, characterized in that it takes delete The method of claim 1,
The method of manufacturing a regenerated polyester false twisted composite yarn with excellent elongation, characterized in that the twisted composite yarn has a fineness of 75d/36~72fila, a strength of 4.00~4.70gf/d, and an elongation of 20~25%.

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