KR102054077B1 - Process Of Producing Polyester Short Fiber Having Good Natural bulkiness - Google Patents

Abstract

The present invention relates to a method for manufacturing polyester monofilaments having excellent bulkiness by supplying sheath core yarns having a polyester C type sheath unit and an available core unit as a core yarn and an effective yarn, false-twisting and interlacing, and cutting the same by a predetermined length. According to the present invention, the present invention uses a side opened hollow fiber having an excellent elution at a room temperature to have a weight loss of 80% by elution while having the same diameter apparently. In addition, the present invention provides C type polyester hollow monofilaments having excellent bulkiness by making the number of crimps per 10 cm of monofilaments be 40-150, thereby providing heat insulating materials providing proper volumes and warm feelings such as duck down.

Description

Process of Producing Polyester Short Fiber Having Good Natural bulkiness}

The present invention relates to a method for producing a polyester short fiber excellent in bulkiness by supplying a sheath core yarn having a polyester c-type sheath portion and a usable core portion as a screening and effect yarn, and then interlacing and cutting to a certain length.

Hollow yarn can feel the light weight by reducing the specific gravity due to the weight reduction to the hollow portion, by using the air has a low thermal conductivity of the air, there is an advantage that can also maintain the thermal insulation. Based on these advantages, the hollow fiber is widely used as a light, thin and excellent thermal insulation material used in winter clothing.

The method of manufacturing the hollow yarn is a method of fusion and solidification of the polymer melt directly under the spinneret by using a spinneret composed of two or more slits arranged to be spaced apart from each other, and a method of dissolving and removing one component after the composite spinneret. There are two ways. In the case of complex spinning, one component of the two-component polymer is eluted. The hollow is maintained even after processing, and the hollow ratio can be freely controlled by adjusting the hollow ratio to 20 to 80%. In addition, even if twisted and twisted has the advantage that the deformation of the hollow portion does not occur by the polymer present in the hollow portion. However, the dissolution of the polymer is high, the manufacturing cost is high, and because of the elution process has a disadvantage that a lot of processing costs occur. In addition, the polyester component in the eluted polymer has a problem in environmental pollution because it uses an alkaline solution such as sodium hydroxide. However, as a result of repeated studies on the manufacturing of hollow yarns through such an elution process, a number of patents have been disclosed that improve the strength and deformation of the hollow, which are conventional problems.

Republic of Korea Patent No. 10-1414206 has improved hollow ratio compared to the conventional hollow fiber to maximize the effect of heat insulation and light weight, etc., while having excellent strength, without deformation and destruction of the hollow fiber in the manufacturing process, excellent elongation It is to provide a C-type hollow fiber manufacturing method with improved flexibility. In addition, even if the hollow ratio in the elution process increases the elution rate also provides a C-type composite fiber manufacturing method that can make the elution process time uniform.

However, the prior art also, the synthetic resin contained in the core portion of the hollow fiber is activated at a high concentration of more than 90 ℃ in sodium hydroxide (NaOH) is possible to elute in a short time. In this case, in the case of complexing with pre-dyed yarn or other fibers, the C-type hollow fiber also causes thermal change due to high temperature and high concentration, and there is a problem that fiber damage, dye departure and contamination may occur. In addition, there is a problem of lowering the uniformity of dyeing due to non-uniform weight loss in the elution process, and the weight loss of the sheath polymer is inevitable due to elution at 90 ° C. or higher for activation of elution. May result.

Accordingly, the present invention relates to a method for producing a side-opening hollow fiber having excellent elutability at room temperature in the Republic of Korea Patent No. 10-1753626 by designing the core portion to allow the core portion to be eluted at room temperature without damaging the hollow fiber dyed dye Minimize problems such as decrease of hollow, alkali invasion of hollow fiber, and have an improved hollow ratio to maximize the effect of hollow fiber such as heat retention and light weight, and at the same time have improved strength There has been provided a hollow fiber in which the hollow is intact and hardly deformed or destroyed. The hollow fiber yarn of the preceding invention is excellent in heat retention and lightness, but has a disadvantage of low crimp number and low bulkiness.

Republic of Korea Patent Registration No. 10-1753626 (July 04, 2017 announcement)

Therefore, in the present invention, by using a side-opening hollow fiber excellent in elution at room temperature, the apparent diameter is the same, but the weight loss of 80% by elution provides a bulky C-type polyester hollow fiber by excellent It is a technical task to provide a thermal insulation material that gives a moderate sense of volume and a warm feeling.

Therefore, according to the present invention, after passing the sheath core yarn having the polyester c-type sheath portion and the usable core portion through the first feed roller and the second feed roller, respectively, as a screening and effect yarn,

After passing through a fin heater having a temperature of 160 ℃ to 180 ℃ heat treatment,

Combustion rate is 1.50 ~ 2.50 times and draw ratio is 1.50 ~ 2.50 times to pass the third feed roller,

After interlacing the screening and the effect yarn in the interlacing nozzle at 1.5 to 6.0 kg / cm 2, the heat treatment was performed in the primary heater at 220 to 240 ° C., and then wound at 500 to 1,000 m / min. After cutting to mm to make short fibers, there is provided a method for producing C-type polyester hollow short fibers excellent in bulkiness, characterized by eluting the usable core portion of the sheath core.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a method for producing a polyester short fiber excellent in bulkiness by supplying a sheath core yarn having a polyester c-type sheath portion and a usable core portion as a screening and effect yarn, and then interlacing and cutting to a certain length.

In the present invention, as shown in Fig. 4, the sheath core yarn having the polyester c-type sheath portion and the usable core portion as the screening (1) and the effect yarn (2), respectively, has a first feed roller (3) and a second feed roller (4). After passing through the heat supply through the fin heater 5 having a temperature of 160 ° C to 180 ° C, and heat-treating it, the drawing ratio is 1.50 to 2.50 times while burning in the combustor 6 at a flammability ratio of 1.50 to 2.50 times. After passing through the feed roller (7), and interlacing the screening and effect yarn in the interlacing nozzle (8) at 1.5 ~ 6.0kg / ㎠, heat treatment in the primary heater (9) at 220 ~ 240 ℃ after firing 500 After winding (10) at ~ 1,000 m / min, then pulverized and cut to 10 ~ 200㎜ made into short fibers, eluting the usable core part of the sheath core company to produce a C-type polyester hollow short fiber excellent in bulkiness do.

In the present invention, the yarn used as the screening and effect yarns uses a sheath core yarn having a polyester c-type sheath portion and a usable core portion as shown in FIG. 1, and the usable core portion is eluted by elution after processing. Use hollow fiber.

After passing through the first feed roller 3 and the second feed roller 4 the sheath core yarn having the polyester c-type sheath portion and the usable core portion to the screening (1) and the effect yarn (2), respectively, After heat treatment by passing through the fin heater 5 having a temperature of 160 ° C to 180 ° C, the draw ratio is 1.50 to 2.50 times, and the draw ratio is 1.50 to 2.50 times the third feed roller 7, but the burn rate is 1.50 to 2.50 times It is important to be combustible so that sufficient crimp can be formed in the yarn.

If the flammability ratio is less than 1.5, the crimp cannot be formed, and if the fuel ratio exceeds 2.50, problems of poor operability may occur.

The draw ratio is preferably 1.50 to 2.50 times, but the draw ratio is less than 1.5, the problem is not bulky, when the draw ratio exceeds 2.50 may cause problems such as moor, loop.

The overfeed rate of the screening and effect yarn is preferably 5 to 10%. If the overfeed rate is less than 5%, the thread is broken due to irregular tension and the thread is weakened. This causes problems that cannot be done.

Thereafter, the screening and effect yarns are interlaced in the interlaced nozzle 8 at 1.5 to 6.0 kg / cm 2, and then heat treated in the primary heater 9 at 220 to 240 ° C., followed by winding at 500 to 1,000 m / min. When the interlacing nozzle is interlaced, it takes less than 1.5㎏ / ㎠ and focuses weakly, resulting in a lack of bulky property, and when it exceeds 6㎏ / ㎠, the strength is weakened due to four damage. The interlaced nozzle is preferably used for imparting bulky property, having a nozzle diameter of 0.5 to 3 mm. In order to have uniform physical properties, the heat treatment is performed in a primary heater at 220 to 240 ° C. after interlacing, and then the winding roller 10 is wound at 500 to 1,000 m / min.

After the finishing process is completed, the plywood is cut into 10 ~ 200mm to make a short fiber, eluting the usable core part of the sheath core company to produce a C-type polyester hollow fiber having excellent bulkiness. It is recommended to ply over 1000 denier for easy cutting into short fibers. In some cases, it is possible to increase the bulky property by imparting crimp to the long fibers during plying.

The number of crimps per 10 cm of the short fiber is 40 to 150, so that it is possible to maximize the light weight and warming effect, and thus it is preferable to use it as a substitute for down, which is a filler for winter clothing.

The elution step can be carried out in the same manner as the elution step of a conventional island-in-the-sea yarn, and the usable core portion present in the yarn is eluted by the elution step to form a polyester c-type cross section hollow fiber.

Therefore, according to the present invention, by using the side-opening hollow fiber excellent in elution at room temperature, the apparent diameter is the same, but to achieve a weight loss of 80% by elution and the number of crimps per 10 cm of the short fiber is 40 to 150 By providing a C-type polyester hollow short fiber excellent in bulkiness, it is possible to provide a heat insulating material that gives a moderate sense of volume and a warm feeling, such as a down feather.

1 is a cross-sectional micrograph of the false twisted yarn before dissolution,
Figure 2 is a cross-sectional micrograph of the false twisted yarn after dissolution,
3 is a side photograph of the false twisted yarn after dissolution,
Figure 4 is a schematic diagram of the manufacturing process of the false-twist yarn for producing the C-type polyester hollow short fibers of the present invention.

In the following examples are non-limiting examples of producing a C-type polyester hollow short fiber excellent in the bulkiness of the present invention.

Example 1

As a screening and effect yarn, sheath core yarn (150d / 36f) having a polyester c type sheath portion and a usable core portion was passed through a first feed roller and a second feed roller, respectively, and then passed through a pin heater having a temperature of 180 ° C. After the heat treatment, the screening and effect yarns were supplied at an overfeed rate of 10%, and the burn rate was combustible at 1.5, while the draw ratio was 1.62 times to pass the third feed roller, and the screening and effect yarns were 5 kg / cm 2 at nozzle diameter 3 After interlacing in an interlaced nozzle of ㎜, heat-treated in a primary heater at 230 ° C., and wound up at a firing speed of 650 m / min with a winding roller, and then spliced and cut into 50 mm lengths to make short fibers, 50 ° C. and 5 A C-type polyester hollow short fiber was prepared by eluting the usable core part of the short fiber with a% sodium hydroxide solution.

Comparative Example 1

A polyester c-type cross-section hollow fiber (150d / 36f) used as a yarn in Example 1 was prepared in the same manner as in Example 1 except that it was not flammable.

The physical properties (elongation, strength, number of crimps, bulkiness) of Example 1 and Comparative Example 1 were measured and shown in Table 1 below.

division Elongation (%) Strength (g / de) Crimp number (ea / 10cm) Bulky rate (%) Example 1 25.6 3.9 75 42.3 Comparative Example 1 27.3 4.2 29 25.6

※ Bulky rate (%)

-Device: 1) Wrap reel: 1.125m in circumference

 2) Dry Oven

 3) President's measuring table, textile scissors

 4) Static weight: 500g, Ultra weight: 5g (S-shaped ring)

 5) Tension Meter: 0 ~ 100g

- How to measure

1) Before measurement, set the winding tension to 'De' × 0.1g.

    2) The number of windings shall be wound after calculating (10,000 / (Display De '× 2)) ÷ 2.

       Ex) In the case of 100 Denier, wind up 25 turns with Wrap reel and make 1 sample.

    3) After placing the sample on the bench, place a load of 5g S-shaped ring and 500g static load, and then read the ledger (L1) for 1 minute.

    4) Sample heat treatment and neglect

      * Super load 5g S-ring is attached to the sample hanger in the state of hanging on the sample and heat-treated in 130 ℃ Dry Oven.

      * After 10 minutes heat treatment, cool for 10 minutes under standard condition.

    5) Sample thickness measurement and calculation

      • Hook the sample with 5g of super load on the measuring stand, wait for 1 minute and read the thickness (L2).

      * Add 500g static load, wait for 1 minute and read the thickness (L3).

       * Bulky Rate (%) = (L3-L2) / (L3) × 100

※ How to measure Crimp: Measured by Favimat of Textechno. Take 10 parts from the sample and measure the number of Crimps.

1: Examination 2: Effector
3: first feed roller 4: second feed roller
5: fin heater 6: flammable part
7: third feed roller 8: interlaced nozzle
9: primary heater 10: winding roller

Claims (3)

After the sheath core yarn with polyester c type sheath part and usable core part was passed through the first feed roller and the second feed roller as the screening and effect yarn, respectively,
After passing through a fin heater having a temperature of 160 ℃ to 180 ℃ heat treatment,
Combustion rate is 1.50 ~ 2.50 times and draw ratio is 1.50 ~ 2.50 times to pass the third feed roller,
After interlacing the screening and the effect yarn in the interlacing nozzle at 1.5 to 6.0 kg / cm 2, the heat treatment was performed at a primary heater at 220 to 240 ° C., and then wound at 500 to 1000 m / min. A method for producing C-type polyester hollow fiber having excellent bulkiness, which is cut to mm to make short fibers, and then eluting the usable core portion of the sheath core. The method of claim 1,
The over-feed rate of the screening and effect yarn is 5 to 10%, characterized in that the C-type polyester hollow short fiber excellent in bulkiness. The method of claim 1,
The method for producing C-type polyester hollow short fibers having excellent bulkiness, wherein the number of crimps per 10 cm of the short fibers is 40 to 150.

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