KR100750458B1 - Method of preparing stretchable nonwoven using elastic knit or woven fabric and side-panel and waist band applying the stretchable nonwoven or stretchable fabric - Google Patents

Abstract

The present invention relates to a method for producing an elastic nonwoven fabric using an elastic knit fabric or a woven fabric, and a side panel and a waist band to which the elastic nonwoven fabric or an elastic fabric is applied, and more specifically, an elastic yarn is knitted with nylon or polyester which is a general garment material, or Woven stretch knit or fabric is interposed between nonwoven layers, or the use of stretch knit or fabric alone is directed to a comfortable side panel for a diaper and waist band, such as underwear.

Disposable Diapers, Sanitary Napkins, Elastic Nonwovens, Elastic Yarns, Side Panels, Waist Bands, Knitting, Weaving, Knitting, Textiles, Nonwovens

Description

METHOD OF PREPARING STRETCHABLE NONWOVEN USING ELASTIC KNIT OR WOVEN FABRIC AND SIDE-PANEL AND WAIST BAND APPLYING THE STRETCHABLE NONWOVEN FABRIC}

1 is a view showing a general straight diaper,

2 is a view showing a general pull-up type diaper.

The present invention relates to a method for producing an elastic nonwoven fabric using an elastic knit fabric or a woven fabric, and a side panel and a waist band to which an elastic nonwoven fabric or an elastic fabric is applied. More specifically, an elastic yarn is knitted or woven with nylon or polyester, which is a material for general clothing. A stretchable knit or woven fabric is interposed between nonwoven layers, or a stretchable knit or woven fabric alone is used to make a stretchable nonwoven fabric that can be used to make side panels and waistbands for a diaper with a comfortable feel, such as underwear.

Disposable diapers vary in their use and form, from infant diapers to adult diapers with urinary incontinence, and in recent years, pull-up types of short pants are increasingly being used rather than simple straight structures. As shown in FIG. 1, the side panel of the diaper is a portion of the disposable diaper touching the waist when the diaper is worn. In the diaper, the diaper is attached to the side panel surface so that the diaper adheres to the body. After making the adhesive to the side panel to be fixed to the waist portion. If this side panel is difficult to stretch and recover due to the movement of the body, especially the waist, it is inconvenient for the waist to be pressed when the side panel is firmly bonded, and when the side panel is loosely bonded. The entire diaper may not be in close contact with the body, and a problem may occur that secretions leak out. Therefore, the side panel portion needs to be made of a material having elasticity, and some companies, such as 3M, manufacture and supply side panels by spunbond or lamination of elastic films.

As shown in FIG. 2, a pull-up type diaper may be divided into a case in which elasticity is applied to the entire waist band and a case in which elasticity is applied only to the side panel portion. It has been given, has a good fit better than the straight type.

In addition to such disposable diapers, nowadays, side panels provided with elasticity are also used for women's sanitary napkins, and the purpose of use is the same as for disposable diapers.

Currently, the most commonly used method for making elastic nonwoven fabric for side panels and waist bands is spunbond, which releases a polymer that can express elasticity after being solidified through a capillary thin tube. After sprinkling on a nonwoven fabric passing through the bottom, the other nonwoven fabric layer is covered thereon and compressed to form an elastic nonwoven fabric. On the other hand, unlike this spunbond method, lamination is performed by attaching the elastic yarn or elastic film with an adhesive or softening the elastic yarn or elastic film with heat while passing the elastic yarn or elastic film between two layers of nonwoven layers. There is a (Lamination) method. As another method, a spunlacing method of lacing a number of short-fiber filaments and elastic films or yarns constituting the nonwoven fabric with water or air while passing the elastic film or yarn between the nonwoven layers is provided. have.

However, some of the conventional methods for manufacturing such a nonwoven fabric is not difficult in terms of imparting elasticity, but because it is a material different from that of general underwear, a red mark may be formed on a tight waist area. It may also cause allergies, such as itching, tearing well compared to the fabric or knitted fabric that is the material for manufacturing underwear, insufficient stability of the form, can not give a comfortable fit.

SUMMARY OF THE INVENTION The present invention has been made to improve the above-described problems of the prior art, and an object of the present invention is to apply a stretchable knit or fabric between nonwoven layers to be applied to side panels and waistbands for diapers having a comfortable feel similar to ordinary underwear. It is to provide a method for producing a stretchable nonwoven fabric.

Another object of the present invention is to provide a side panel and a waist band made by using the stretchable nonwoven fabric produced by the above method, or by using the stretchable knit or the fabric alone.

One aspect of the present invention for achieving the above object relates to a method for producing a stretchable nonwoven fabric, characterized in that the elastic knitted or woven stretched knitted fabric or woven fabric between the nonwoven layer to the lacing.

Another aspect of the present invention relates to a stretchable nonwoven fabric manufactured by the above method and a side panel or waistband made using the same.

Another aspect of the invention relates to a side panel or waistband made solely of an elastic knit or woven knitted or woven with elastic yarn.

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

The elastic yarn used in the present invention is not particularly limited, such as polyether-based, polyester-based or polyamide-based polyurethane or polyurethane urea, but for the convenience of description, the following description will be made using polyether-based polyurethane urea elastic yarn as an example. As follows.

The segmented polyurethane urea polymer that can be used to prepare such polyether-based polyurethane urea elastic yarn is prepared by reacting organic diisocyanate and polymer diol as known in the art to prepare a polyurethane precursor. It is then prepared by dissolving it in an organic solvent and then reacting with diamine and monoamine.

The organic diisocyanate used in the present invention includes diphenylmethane-4,4'-diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, butylene diisocyanate, hydrogenated P, P-methylene diisocyanate and the like. As the polymer diol, polytetramethylene ether glycol, polypropylene glycol, polycarbonate diol, and the like may be used. The diamines are used as chain extenders, and examples thereof include ethylenediamine, propylenediamine, hydrazine, and the like. In addition, the monoamine is used as a chain terminator, and examples thereof include diethylamine, monoethanolamine, dimethylamine, and the like. In addition to the above components, as the other additives, UV stabilizers, antioxidants, NOx gas yellowing inhibitors, anti-sticking agents and the like may be additionally used.

After the polyurethaneurea polymer is aged, the polyurethaneurea polymer is spun for a certain period of time and then spun through a spinning tube through which hot air is blown to evaporate and solidify the organic solvent to wind up the polyurethaneurea elastic yarn.

The elastic yarn thus produced is made of stretchable knit or woven by knitting or weaving according to one aspect of the present invention. Elastic knit or woven fabric is a fabric made by knitting or weaving the elastic yarn with nylon or polyester which is a general garment material.

Specifically, for example, in the case of knitting, using the above-mentioned polyurethane urea elastic yarn using a circular knitting machine, as a relative yarn, polyester 60-80 denier or nylon 60-80 denier grade is used, the ratio of the input of the elastic yarn and the relative yarn 1 to 1 silver, the density of the fabric is 3 to 10 gauge (Guage) to knit. After opening the knitted fabric in this manner is set to a temperature of 180 ~ 190 ℃ in a tenter (Tentering) to prevent the edge of the fabric to dry, to provide a dimensional stability (Dimensional stability).

On the other hand, in the case of weaving, after covering the above-mentioned polyurethane urea elastic yarn using a polyester 60-80 denier or nylon 60-80 denier grade as a counterpart yarn, the warp yarn is made of nylon or polyester of the same specification, Weaving of pre-prepared covering yarns, weaves the warp / weft density to 50/50 strands per square inch. In this way, the woven fabric is set at a temperature of 170 to 180 ° C. in the tenter, thereby imparting dimensional stability to the fabric.

The stretched or woven fabric thus knitted is interwoven between the nonwoven layers to produce a stretchable nonwoven fabric. The stretchable fabric is introduced between the nonwoven fabric layers using a spunlace nonwoven fabric production apparatus, and lacing with the nonwoven fabric using high pressure water or air. In the case of lacing with high-pressure water or air as described above, the elastic nonwoven fabric in which the elastic fabric and the nonwoven fabric are tightly coupled because the elastic yarn or the counterpart yarn constituting the elastic fabric cannot be entangled and bound by numerous filaments on the nonwoven fabric. It can be prepared.

The elastic nonwoven fabric prepared as described above does not tear better than a conventional elastic nonwoven fabric when used as a side panel and a waistband for disposable diapers or sanitary napkins, and can provide a feeling of touch and comfort similar to clothing.

In addition, even when the elastic fabric is used alone without a non-woven fabric to be used as a side panel and waistband of a disposable diaper or sanitary napkin, the above characteristics can be imparted because the elastic knitted fabric or the fabric itself is a garment material. In particular, when the elastic fabric is used alone, there is no need for racing, so the fabric density does not necessarily need to be a low gauge.

Hereinafter, the present invention will be described in more detail with reference to examples, but these examples are for illustrative purposes only and should not be construed as limiting the scope of the present invention.

Example  One

Put 48 deniers of 40 denier yarn into circular knitting machine, put 75 denier 48 cones of polyester in krill, knit 1 to 1 single jersey structure, 6 gauge density, and set the circular knitting fabric at 190 ℃ for 1 minute in tenter. Thereafter, the knitted fabric was laced with high pressure water while passing through the nonwoven fabric sheets using a spunlace manufacturing facility to produce a stretchable nonwoven fabric.

After the side panel was made of the elastic nonwoven fabric thus prepared, the side panel was measured with a fabric tester to measure the maximum elongation (%) and 5 ^th unload (Power, g), and the results are shown in Table 1 below.

In addition, in order to evaluate the dimension stability of the side panel made of this stretchable nonwoven fabric, an accelerated seasoning test (60 ° C., 72 hours) was performed to measure the rate of change of the dimension before and after the heat treatment (area before and after the heat treatment). The results are shown in Table 1 below.

In addition, by using the Kawabada machine, the touch (Hand, Surface property) of the side panel was measured, the bending stiffness (Stiffness) was measured, and the results are shown in Table 1 below.

On the other hand, adult side diaper (Incontinence) produced by applying this side panel to wear to the general public, to evaluate the comfort (Comfortness, red mark on the waist area after wearing for 24 hours) and the results are shown in Table 2 below.

Example  2

After covering 40 denier elastic yarn with 75 polyester denier, TPM (Twist per meter) 600, and the draw ratio of elastic yarn to 3.2, after covering 75 denier polyester, weaving the covering yarn and weft / weft density Weaved 50/50 strands per square inch with an air jet loom. The woven fabric thus prepared was set at a temperature of 180 ° C. for 1 minute in a tenter, and a stretchable nonwoven fabric was produced in the same manner as in Example 1 using this set fabric.

After the side panel was made of the elastic nonwoven fabric thus prepared, the physical properties of the side panel were evaluated in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

In addition, the physical properties of the adult adult diaper (Incontinence) produced by applying the side panel was performed in the same manner as in Example 1 and the results are shown in Table 2 below.

Example  3

After preparing the circular knitted fabrics heat-set in the same manner as in Example 1, a side panel was made from the fabrics.

The physical property evaluation of the side panel manufactured as described above was evaluated in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

In addition, the physical properties of the adult adult diaper (Incontinence) produced by applying the side panel was performed in the same manner as in Example 1 and the results are shown in Table 2 below.

Example  4

After preparing a heat-setting fabric fabric in the same manner as in Example 2, a side panel was made of this fabric.

The physical property evaluation of the side panel manufactured as described above was evaluated in the same manner as in Example 1, and the measurement results are shown in Table 1 below.

In addition, the physical properties of the adult adult diaper (Incontinence) produced by applying the side panel was performed in the same manner as in Example 1 and the results are shown in Table 2 below.

Comparative example  1 ~ 2

Among the disposable diapers on the market, the side panel manufacturing method is lamination between polyolefin-based elastic yarns in which spunbonding is applied between nonwoven fabrics (type A) and polyurethane-urea-based elastic yarns between nonwoven fabrics. Two types of products (type B) were obtained, and only the side panels were separated from these two products to evaluate physical properties as in Example 1, and the disposable diaper itself was evaluated for physical properties, and the results are shown in Tables 1 and 2 below. Indicated.

TABLE 1

TABLE 2

[Property evaluation method]

● Maximum elongation (%): The maximum elongation (%) is measured by elongation of samples to the maximum length before tearing by using Textechno's Tensile tester (international standardized equipment). . Therefore, when the maximum elongation (%) is high, it means that the tear resistance is large.

● 5 ^th unload (g): Textechno Tensile tester is a 40% elongation load on a 5 ^th cycle unload curve when the Cycling test is repeated 5 times with 100% elongation and recovery of samples. This value is the power level of the samples. Typically, the lower this value is, the more comfortable the measurement is.

● Dimensional stability (%): It means the shape stability of the samples. After putting the samples into the convection oven for 72 hours at 60 ℃ X 20% RH, change the area after heat treatment compared to the area of the sample before heat treatment. Calculated value. If this value is large, it means that form stability is good.

● Tactile (Hand, SMD): Kawabada measuring the surface unevenness of each sample. The smaller the SMD value with the same concept as standard deviation, the smaller the surface is.

● Stiffness (bending stiffness, gf / cm): A measure of the bending stiffness of each sample using a Kawabada measuring instrument. The smaller this value, the smaller the flexibility.

• Comfortness: This is the average result of the subjective judgment of the comfort feeling of each individual obtained from the Consumer test actually wearing disposable diapers. The Consumer population consists of 100 adult men and women.

● Whether red mark occurs: In the Consumer test, the red mark generated by the side panel closely attached to the waist is measured by area, and the severity is classified.

* Not Occurred: 0cm ²

* Weak generation: less than 10cm ²

* Occurrence: 10cm ² or more

According to the present invention, it is possible to manufacture a stretchable nonwoven fabric having a comfortable feel similar to underwear and excellent elasticity, and not to be torn, so that a more luxurious disposable diaper or sanitary side panel and a waist band can be manufactured. Using only stretch fabric alone can give the same effect to the side panel and waistband for disposable diapers or sanitary napkins, making it possible to make disposable diapers like clothing and move in the direction of not having to wear additional underwear on the outside. There is an advantage to this.

Claims (12)

A method for producing a stretchable nonwoven fabric, characterized in that the elastic yarn is knitted or woven with polyester or nylon, and the elastic knit fabric or woven fabric is interlaced between the nonwoven fabric layers. delete The method of manufacturing a stretchable nonwoven fabric as claimed in claim 1, wherein the stretchable fabric or fabric is bonded to the nonwoven fabric using high pressure water or air. A stretchable nonwoven fabric produced by the method according to any one of claims 1 to 3. A side panel made of the stretchable nonwoven fabric according to claim 4. Waist band made of the elastic nonwoven fabric according to claim 4. A diaper to which the side panel of claim 5 or the waist band of claim 6 is applied. Sanitary napkin to which the side panel of claim 5 is applied. A side panel made exclusively of an elastic knit fabric or fabric made by knitting or weaving elastic yarn with polyester or nylon. Waist bands made solely of stretch knits or fabrics made by knitting or weaving elastic yarns with polyester or nylon. A diaper to which the side panel of claim 9 or the waist band of claim 10 is applied. Sanitary napkin to which the side panel of claim 9 is applied.

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