KR101090888B1 - Method of manufacturing nonwoven fabric having high elasticity - Google Patents

Abstract

The present invention relates to a method of manufacturing a nonwoven fabric having a circular restorability, and more particularly, a composite PTT fiber in which polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) are bonded to nylon fibers and high shrinkage (High Shrinkage). The present invention relates to a method for producing a nonwoven fabric having not only excellent elasticity but also excellent circular restorability by mixing with polyester fibers to produce a nonwoven fabric.

The present invention provides a blending step of blending a composite PTT fiber, a highly shrinkable polyester and a general nylon fiber, a carding step of forming the blended cotton into a flat sheet web, and binding the formed flat sheet web through a needle punching machine. A needle punching step, a shrinking step of shrinking the needle punched flat sheet web, a drying step of dewatering and drying the shrinked flat sheet web, and a car for passing the dried flat sheet web on a pair of upper and lower thermal calenders Comprising a rendering step, the carding step, combing the surface using the work roller and the carding roller provided in the carding machine, the work roller is operated at 50m / min ~ 80m / min, the carding roller It provides a method for producing a nonwoven fabric having a circular restorability, characterized in that the surface speed is operated at 600m / min ~ 900m / min.

Non-woven fabric, non-woven fabric manufacturing, circular restoration, stretch recovery, composite PTT, high shrink polyester, PTT, PET, nylon

Description

Method of manufacturing nonwoven fabric having a circular restorability {Method of manufacturing nonwoven fabric having high elasticity}

The present invention relates to a method of manufacturing a nonwoven fabric having a circular restorability, and more particularly, a composite PTT fiber in which polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) are bonded to nylon fibers and high shrinkage (High Shrinkage). The present invention relates to a method for producing a nonwoven fabric having not only excellent elasticity but also excellent circular restorability by mixing with polyester fibers to produce a nonwoven fabric.

As a coating material to replace paper or woven fabric, a conventional nonwoven fabric refers to a fabric made by laminating yarns without weaving cloth, and is entangled with various textile materials such as natural, chemical, recycled, etc. without having a certain direction. After forming the web in the form of), it is combined and stabilized by chemical and physical methods and manufactured like paper or cloth, and widely used in industrial materials or living environments according to its purpose of use.

In particular, as non-woven fabrics are replaced by artificial leather, which is mainly made of natural leather, various materials such as bags, clothing, balls, and shoes are gradually replaced with artificial leather which is more environmentally friendly, less pollution, and easy to mass-produce. It is utilized as a material, and thus, researches to improve the quality and functionality of the nonwoven fabric have been actively conducted.

Conventional nonwoven products have almost no elasticity and circular restorability, and nonwoven fabrics with spandex scrim combined with circular restoring properties have a high price and defect rate. there was. In addition, nonwoven fabrics that are imparted with circular resilience using PVA yarns are very expensive and difficult to produce, and when PVA is dissolved, the dissolved parts become voids without yarn, so the surface adhesion strength, There was a problem that the tear strength is very low.

In order to solve this problem, a nonwoven fabric manufactured using a composite PTT has been proposed in Korean Patent Registration No. 700796. Patent No. 700796 manufactures polyethylene terephthalate (PET) and poly trimethylene terephthalate (PTT) as a composite fiber by using a composite spinning method of side-by-side type. By blending short fibers to produce a nonwoven fabric, a nonwoven fabric expressing elasticity can be produced.

However, when the nonwoven fabric is manufactured by mixing the composite PTT with nylon short fibers or polyester short fibers, the elasticity and the circular restorability are higher than those of the conventional nonwoven fabric, but the elasticity and the circular restorability are still inferior to those of the natural leather. There is a limit to the use as artificial leather.

The present invention is to solve the above problems according to the prior art. That is, an object of the present invention is to produce a nonwoven fabric by mixing a composite PTT fiber in which polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) are bonded with nylon and high shrinkage polyester fiber. The present invention provides a method for producing a nonwoven fabric having not only elasticity but also excellent circular restorability.

The present invention provides a blending step of blending a composite PTT fiber, a highly shrinkable polyester and a general nylon fiber, a carding step of forming the blended cotton into a flat sheet web, and binding the formed flat sheet web through a needle punching machine. A needle punching step, a shrinking step of shrinking the needle punched flat sheet web, a drying step of dewatering and drying the shrinked flat sheet web, and a car for passing the dried flat sheet web on a pair of upper and lower thermal calenders Comprising a rendering step, the carding step, combing the surface using the work roller and the carding roller provided in the carding machine, the work roller is operated at 50m / min ~ 80m / min, the carding roller It provides a method for producing a nonwoven fabric having a circular restorability, characterized in that the surface speed is operated at 600m / min ~ 900m / min.

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The nonwoven fabric according to the present invention has excellent elasticity, elasticity and circular restoration superior to the conventional products, and the above-described function is maintained even after polyurethane processing, and thus the product can be manufactured with excellent elasticity, circular restorability, elasticity and the like of PU artificial leather processed products. . In addition, by producing a high-performance non-woven products can be applied to a variety of industrial materials, household goods and the like by mass-producing quality similar to natural leather.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fibers of the nonwoven artificial leather according to the present invention are a composite PTT fiber in which polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) are bonded, a highly shrinkable polyester fiber and a general nylon fiber. In the present invention, the composite PTT fiber 20% to 60%, highly shrinkable polyester fiber 20% to 40%, the general nylon fiber 20% to 40% by weight of the blending is preferred, the non-woven fabric outside this range Workability and product properties at the time of manufacture become undesirable. That is, if the high shrink polyester content is less than 20%, the nonwoven fabric does not shrink easily, and if the high shrink polyester content is over 40%, the nonwoven fabric will shrink excessively, making it unsuitable for use in the manufacture of artificial leather. do.

Here, the composite PTT fibers are composed of poly trimethyleneterephthalate (PTT), terephthalic acid, and ethylene glycol (Ethylene glycol) mainly composed of terephthalic acid and propanediol (PDO). Poly Ethylene terephthalate (PET) was spun to a weight ratio of 2: 8 to 8: 2, and polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) were bimetalized in the lengthwise direction of the fiber. It is a yarn manufactured to form a structure.

In addition, High Shrinkage Polyester is a polyester obtained by copolymerizing polyethylene terephthalate (PET) with a third component such as isofutal, and has a boiling water shrinkage of 20% or more and a maximum heat shrinkage stress value of 0.4 g / denier or more. Shrink polyester fibers are used.

The nonwoven product produced according to the method of the present invention has a greatly improved quality in elasticity and circular recovery rate as compared to the conventional product. Hereinafter, various examples and comparative examples will be described to improve the quality of the nonwoven product manufactured according to the method of the present invention. The following examples are only for illustrating the present invention more specifically, but the scope of the present invention is not limited to these examples.

≪ Example 1 >

A nonwoven fabric was prepared by metering 50% composite PTT fiber (2.5De × 64mm) (weight), 25% (weight) high shrink polyester and 25% (weight) of nylon fiber (2De × 51mm) in a predetermined amount from the horn surface. .

<Example 2>

A nonwoven fabric was prepared by metering 25% composite PTT fiber (2.5De × 64mm) (weight), 35% high weight polyester (weight), and 40% nylon (2De × 51mm) weight (weight) in the mixed surface. .

Comparative Example 1-Conventional Nonwoven Fabric

Nonwoven fabrics were prepared by metering 40% composite PTT fibers (2.5 De x 64 mm) (weight) and 60 percent nylon fibers (2 De x 51 mm) in weight at a given amount.

Comparative Example 2-Conventional Nonwoven Fabric

Non-woven fabric was prepared by metering 40% (weight) of high shrink polyester and 60% (weight) of nylon fiber (2De x 51 mm) in a predetermined amount on the horn surface.

Comparative Example 3-Conventional Nonwoven Fabric

Nonwoven fabric was prepared by metering 40% by weight of general polyester and 60% by weight of nylon fiber (2De x 51 mm) in a predetermined amount on the horn surface.

<Test Example 1>

Evaluation item Test Act Weight (g / ㎡) KSK 0514 (0.001g Balance) Thickness (mm) KSK 0506 (Dlal Gauge) Tensile strength (kgf / 2.5㎝) KSK 0520 (2.5cm Cut Strip Method) Shinto (%) KSK 0520 (2.5cm Cut Strip Method)

After measuring the weight and thickness of the test pieces of Examples 1, 2 and Comparative Examples 1, 2, and 3, the tensile strength and elongation for measuring elasticity were evaluated by the KS standard inspection method of Table 1 above, and the results were evaluated. Table 2 shows.

<Test Example 2>

After maintaining the grip interval of the tensile tester at an interval of 7.5 cm, color marking was applied to the end portions of the test specimens of Examples 1,2 and Comparative Examples 1, 2, and 3, and the elongation was 20 on the display of the tensile tester. When%, 50% is indicated, after stopping the operation of the tensile tester and measuring the reduced length by releasing the grip, the recovery rate is calculated according to Equation 1 below and the results are shown in Table 2. In this case, the grip and the grip interval of 7.5cm were excluded from the recovery rate calculation.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Thickness (mm) 1.1 1.07 1.05 1.12 1.1 Density (g / cm 3) 0.259 0.258 0.247 0.254 0.247 The tensile strength
(kg / in) MD 23 26 27 32 41 CD 16 18.5 23 23 38 Elongation
(%) MD 113 115 105 105 65 CD 195 205 138 162 98 % Recovery 91 84 65 48 26

(At this time, MD is Machine Drection, CD: Cross Direction)

Looking at the measurement results of the above Examples and Comparative Examples, Examples 1 and 2 have a lower tensile strength than Comparative Examples 1, 2, 3, but also showed excellent cutting elongation and recovery rate, showing excellent elasticity and circular recovery rate. It can be seen. That is, the nonwoven fabrics prepared according to the present invention (Examples 1 and 2) can be effectively stretched with a small force compared to the conventional nonwoven fabrics (Comparative Examples 1 to 3), and the breaking elongation does not easily rupture even to some extent. Of course, by showing an excellent circular recovery rate it can be seen that it is easily restored to a circular within a short time when the tensile force disappears.

In conclusion, it can be seen that the nonwoven fabric prepared by mixing the composite PTT with the high shrink polyester and the general nylon fiber according to the present invention shows excellent elasticity even with a small force, and shows excellent superiority in the circular recovery rate. It can be seen that it shows the characteristics suitable for use as a high functional material such as.

Hereinafter, a method of manufacturing a nonwoven fabric having circular restorability according to the present invention will be described with reference to FIG. 1. 1 is a flowchart illustrating a method for manufacturing a nonwoven fabric having circular restorability according to an embodiment of the present invention.

As shown in FIG. 1, first, the composite PTT fiber, the high shrink polyester fiber, and the general nylon fiber are mixed at a predetermined ratio (S102). The blending process is a process of mixing and mixing each yarn uniformly in the hopper. The present invention provides 20% to 60% of composite PTT fibers, 20% to 40% of highly shrinkable polyester fibers, and 20% to 40% of general nylon fibers. It mixes so that it may become the weight ratio of.

Subsequently, a flat sheet web is formed through a carding process (S104). The carding process is a process of loosening the cotton supplied in the blending process from the other surface machine to remove the impurities to form a web. Combing the surface through the other surface and the carding machine and mixing them evenly so as not to have a directivity to form a flat sheet web of a certain weight and width. After forming, the carded web is transferred to a needle punching process through a cross lapper process that folds the carded web into an appropriate layer. At this time, since the composite PTT fiber is in the form of a pigtail, it is difficult to comb the surface to form a uniform web. Therefore, the work roller of the carding machine is reduced from 50 m / min to 80 m / min from the conventional 80 m / min to 130 m / min, and the surface speed of the carding roller is also 600 m / min to 900 m / min at the conventional 900 m / min to 1200 m / min. Lowered to facilitate combing of the surface and to form a flat sheet web with good smoothness and homogeneity.

The needle punching process is a process of binding the web, and the needle punching machine pierces the web on the flat sheet formed in the carding process vertically with a myriad of needles and presses it through a pair of upper and lower feed rolling rollers to improve tensile strength (S106). That is, a number of needles are provided in the upper part and holes corresponding to the upper needles are passed through the needle punching machine formed in the lower part, so that the web is compressed and punched to have strong toughness and strength, and the needles have their hooks facing upwards. When the needle comes down using the formed, it simply passes through the web, but when it goes up again, the hook formed on the side of the needle tears up the fiber, increasing the density while making the fiber yarn more irregular. At this time, the needles provided in the needle board of the needle punching machine is increased from 300 to 420 pieces from 200 to 320 pieces, and the draft is further reduced by 20% to 30% from 35% to 50% to increase the density. .

Subsequently, the needle punched nonwoven fabric is overfeeded using a Relex device so as not to be tensioned, and then supplied to the shrinking device (S108). High shrink polyester is easily contracted, and the shrinkage rate varies greatly depending on the temperature, and thus the degree of contraction effect and spontaneous elongation effect is changed, and problems such as curling phenomenon and weight deviation may occur. , Divide the shrinking process into two stages. That is, after preliminarily contracting in a first step in a first hot water bath having a temperature of 50 ° C. to 98 ° C., it is transferred to a second hot water bath having a temperature of 50 ° C. to 98 ° C. for complete shrinkage.

The nonwoven fabric that has been contracted is dehydrated by passing through a pair of dehydrating rollers (S110), and coated with a roller to improve surface smoothness and physical properties of the nonwoven fabric (S112), and then through a tender that maintains a constant width through a chamber or cylinder. Dry in a drying apparatus of the formula (S114). Drying starts the initial drying temperature at 70 ℃ and the final temperature to 170 ℃ to dry all the moisture remaining on the nonwoven fabric. The dried nonwoven fabric is passed through a pair of upper and lower thermal calenders having constant intervals to obtain a final nonwoven fabric (S116). At this time, the upper and lower pair of heat calender is adjusted so that the heating temperature is 80 ℃ ~ 170 ℃, speed 3m / min ~ 10m / min.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a flow chart illustrating a method for manufacturing a nonwoven fabric having a circular stability in accordance with an embodiment of the present invention.

Claims (10)

delete delete In the method for producing a non-woven fabric having a circular restorative by mixing a composite PTT fiber, a general nylon fiber and a highly shrinkable polyester, A blending step of blending the composite PTT fiber with the highly shrinkable polyester and the general nylon fiber; A carding step of forming the mixed fiber into a flat sheet-like web; A needle punching step of binding the formed flat sheet web through a needle punching machine; A contraction step of contracting the needle punched flat sheet web; A drying step of dewatering and drying the contracted flat sheet web; A calendering step of passing the dried flat sheet-like web through a pair of upper and lower thermal calenders; Consists of including The carding step, The combing of the surface is performed using the work roller and the carding roller provided in the carding machine, the work roller is operated at 50m / min ~ 80m / min, and the surface speed of the carding roller is operated at 600m / min ~ 900m / min. A method for producing a nonwoven fabric having a circular restorability, characterized in that. The method of claim 3, The blending step, 20% to 60% of composite PTT fibers, 20% to 40% of highly shrinkable polyester fibers, and 20% to 60% of normal nylon fibers. The method according to claim 3 or 4, The composite PTT fiber, Polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) is a method of manufacturing a non-woven fabric having a circular restorability, characterized in that the yarn is manufactured to form a bimetal structure. delete The method of claim 3, The needle punching step, 300 to 420 needles are provided on the needle board of the needle punching machine, the method for producing a nonwoven fabric having a circular restorability, characterized in that the draft is carried out to 20% to 30%. The method of claim 3, The contraction step, After pre-shrink in a first hot water bath having a temperature of 50 ℃ ~ 98 ℃, transfer to a second hot water bath having a temperature of 50 ℃ ~ 98 ℃ to perform a complete shrinkage, characterized in that the manufacturing method of the nonwoven fabric having a circular restoration. The method of claim 3, The drying step, Performed in the temperature range of 70 ℃ ~ 170 ℃, drying method while producing a non-woven fabric, characterized in that for drying while gradually increasing the drying temperature from a low temperature to a high temperature. The method of claim 3, The calendaring step, A method for producing a nonwoven fabric having a circular restorability, characterized in that it is carried out by passing between a pair of upper and lower thermal calenders having a heating temperature of 80 ° C to 170 ° C and a speed of 3m / min to 10m / min.

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