KR101839298B1 - Long fiber non-woven fabric loop for hook type fastener - Google Patents

Abstract

The present invention relates to a long-fiber nonwoven fabric loop for a hook fastening member. The nonwoven loop made of a multilayered spunbond long-fiber nonwoven sheet is characterized by: having a lower layer (S1) which is a thermoplastic polyolefin-based long-fiber nonwoven sheet with a fineness of 1-2 denier; having an upper layer (S2) which is a thermoplastic polyolefin-based long-fiber nonwoven sheet with a fineness of 4-6 denier; and having the long-fiber nonwoven sheets disposed as the lower layer (S1) and the upper layer (S2) bonded together by using a heat embossing roll. The long-fiber nonwoven fabric loop for a hook fastening member according to the present invention has advantages of reducing manufacturing cost due to a simple process system and being environment-friendly since no additional adhesive is used.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a long fiber nonwoven fabric loop for a hook fastening member,

The present invention relates to a long-fiber nonwoven fabric loop for a hook fastening member, and more particularly to a long-spun nonwoven fabric nonwoven fabric having a spunbond long-fiber nonwoven fabric sheet having a higher- Various disposable products including disposable diapers and bedclothes that use the same are economical in manufacturing cost and have excellent performance such as desorption ability and air permeability to secure strong fastening force with the hook and fastening with a hook having improved durability in repeated detachment Member nonwoven fabric loops.

BACKGROUND ART [0002] Generally, as a binder for a disposable product such as a bed cover or a surgical gown including an infant diaper and an adult diaper, it is possible to form a mechanical connection with a hook member, ) Nonwoven fabrics are mainly used.

In this disposable product, the hook and loop fastener for wearing the hook and loop fastener has a function of allowing the hook and the hook to be attached and detached from each other, , Commonly known as 'squeaky' or 'velcro' according to the trade name. Among them, the loop fastener is usually produced by laminating a film to a non-woven fabric or a non-woven fabric of a multi-layered structure. Such a non-woven fabric and a composite body with the film are also used for producing a disposable product such as a diaper.

Accordingly, the hook member has an arch shape, a mushroom shape, a hook shape, and the like, so that the hook member can be well-fitted to the loop member, and the mechanical coupling prevents each component from being easily separated. That is, the portion where the hook member and the loop member are fastened is required to have an adhesive force to maintain normal bonding during use due to a shear strength parallel to the peel strength perpendicular to the surface.

On the other hand, conventionally, in the manufacturing process of the nonwoven fabric used for the loop member, the nonwoven fabric or the film is joined together by an adhesive, heat bonding or the like through a step of weaving a fabric or a step of punching a nonwoven fabric. There are disadvantages that when the product is stored in a roll form, the volume feeling is lowered and the feeling of softness is lowered due to heat punching.

In order to compensate for these drawbacks, some of the non-woven fibers are conveyed by a pair of rollers having irregularities to form a corrugation (curvature or mound), and then a thermoplastic resin film is formed by ordinary T- There is a method of joining but this is because the single resin film is bonded to one surface of the nonwoven fabric and has an extremely limited use that can be used only for loop fasteners, A laminated sheet having a structure in which a corrugated loop is formed is used.

The nonwoven fabric of such a loop system is mainly used in a relatively short period due to the characteristics of use of disposable products such as personal hygiene materials, clothing, bags, sporting goods, protective clothing, adult and infant wear products, It is becoming a key technology to lower the total material cost and minimize the manufacturing cost in terms of product design. In addition, it should be easy to detach and be used repeatedly, and the bonding performance should be stabilized and the peeling property must be excellent.

However, the loop nonwoven fabric manufactured by the conventional method has a disadvantage in that when it is combined with the hook member and used repeatedly, the loops formed by the upper and lower corrugations cause a lot of lint and have no stable binding force. In addition, since an excessive corrugated loop is formed in the nonwoven fabric, there is a difficulty in joining with the other nonwoven fabric or the film layer. When the material is used as a material directly contacting the human body, the nonwoven fabric has a smooth and soft texture, There is a fear that it may cause a problem and cause a trouble due to too low air permeability.

As described above, there is a continuing need for a loop system that can improve the low cost of loop nonwoven fabric and the mechanical coupling system in the fields of disposable sanitary articles and protective articles, as well as improve various performances such as softness and breathability. to be.

In order to solve the above problems, Korean Unexamined Patent Application Publication No. 10-2006-0008831 (Hanjin P & C Co., Ltd.) discloses a method for improving the fiber density of the outer surface of a protrusion formed by heating or pressing a non- A loop protrusion protruding from the surface of the nonwoven fabric and corresponding to the adhesive hook, so as to provide an adhesive loop sheet in which the nonwoven fabric loop layer is formed. The fiber density of the loop protrusions having a density lower than that of the nonwoven fabric floor; A nonwoven fabric loop sheet comprising a bonded surface formed by protrusions corresponding to a preliminarily bonded tape for a bonding tape, characterized in that a nonwoven loop sheet having good adhesion and good adhesion stability to the adhesive tape for hooking, However, this has a difficulty in the process of reducing the fiber density on the outer surface of the projections.

Korean Patent Laid-Open Publication No. 10-2010-0119107 (Shinwoo P & C Co., Ltd.) discloses a method for producing a loop tape for a hook-and-loop fastening system having excellent bonding strength and excellent air permeability such as peel strength and a loop tape formed therefrom (a) a second fiber comprising a second fiber comprising a first fiber comprising a first thermoplastic polymer having a predetermined melting point and a second polymer having a melting point higher than the melting point of the first thermoplastic polymer or a high decomposition temperature A loop structure including a plurality of loops fixedly secured to the ground tissue; And (b) a third thermoplastic polymer laminated on the lower surface of the loop structure and having a melting point lower than the melting point or the decomposition temperature of the second polymer, wherein the paper structure and the nonwoven fabric comprise And the first fibers and the third fibers are thermally fused to each other by melting.

Further, in Korean Patent Registration No. 10-1212426 (Toray Industries, Ltd.), a spunbonded nonwoven fabric is used as an outermost layer, an inner layer has at least one meltblown nonwoven fabric layer, and at least one spunbonded non- Wherein the spunbonded nonwoven fabric layer constituting the outermost layer comprises a core-sheath type filament yarn in which the low melting point polymer wraps the high melting point polymer in the longitudinal direction of the filament, , A meltblown nonwoven fabric layer is formed between the spunbond nonwoven fabric layers made of the core-sheath type long fibers and laminated on a continuous belt to form a web and bonded to a calender capable of thermocompression bonding to form a sheet Characterized in that the composite spunbond is manufactured by heat treating the heat-treated drum at a temperature of from 80 to 110 DEG C A method for producing a long-fiber multi-layer nonwoven fabric is described.

In addition, Korean Registered Patent No. 10-1319183 (Toray Hi-tech Materials Co., Ltd.) also has a spunbonded nonwoven fabric as the outermost layer and an inner layer has a meltblown nonwoven fabric layer of one layer, and if necessary, at least one layer of spunbonded non- A method for producing a spunbond multilayer nonwoven fabric in which a trowel nonwoven fabric layer is additionally laminated or a meltblown layer may not be laminated is characterized in that in order to surround the core portion in the longitudinal direction of the sheath portion, , A high melting point polymer or a propylene polymer is applied to a core portion and a low melting point polymer or an ethylene polymer is directed to each nozzle hole in a sheath portion to produce a core-sheath type composite long fiber, The composite filament fibers are laminated on a porous continuous belt which is easy to separate the fibrous web and the belt, web to form an air jet apparatus for facilitating the separation of the fibrous web and the belt, and a step of heat-treating the sheet type in which the composite filament web is partially thermally compressed and fixed by embossing, .

In the meantime, the present invention can reduce the manufacturing cost due to a simple process system by bonding a multi-layered long-fiber nonwoven fabric sheet formed by using a spunbond nonwoven technology by using a thermal emboss roll, Fiber nonwoven fabric sheet made of long-fiber nonwoven fabric made of fibers having a high density and a low air permeability, while the upper web has a long fiber nonwoven fabric sheet made of fibers having a higher fineness, the productivity of the end product using the loop is increased, And a long-fiber nonwoven loop for a hook fastening member excellent in durability at the time of repeated attachment and detachment while securing a stable fastening force of the hook fastening member.

Korean Patent Publication No. 10-2006-0008831 (Published on Jan. 27, 2006) Korean Patent Publication No. 10-2010-0119107 (Publication date: November 09, 2010) Korean Registered Patent No. 10-1212426 (public announcement date: December 13, 2012) Korean Registered Patent No. 10-1319183 (Notification date: Oct. 18, 2013)

It is an object of the present invention to provide a method and apparatus for bonding a spunbond long filament nonwoven fabric sheet with a multi-layered spunbond long filament nonwoven fabric sheet by a thermal embossing roll to reduce manufacturing costs associated with a simple process system, Since the density of the long fiber nonwoven fabric sheet is increased, the air permeability is lowered and the nonwoven loop is transferred by vacuum suction to facilitate positioning (positioning) when the final product is manufactured. The use of a long fiber nonwoven fabric sheet made of fibers of high fineness has excellent peel strength and horizontal shear strength to provide a strong hooking force with hooks and a hook having excellent durability during repeated detachment To provide a long-fiber nonwoven fabric loop for a fastening member.

The long-fiber nonwoven fabric loop for a hook fastening member of the present invention is a nonwoven fabric loop made of a spunbond long-spun fibrous nonwoven fabric sheet having a multilayer structure, wherein the lower layer (S1) is made of a thermoplastic polyolefin- Wherein the upper layer S2 is a thermoplastic polyolefin-based long-fiber nonwoven fabric sheet having a fineness of 4 to 6 denier and the long-fiber nonwoven fabric sheet disposed of the lower layer S1 and the upper layer S2 is a thermo- And are joined together.

According to a preferred embodiment of the present invention, the nonwoven fabric sheet bonded with the lower layer S1 and the upper layer S2 is formed to have a thickness of 0.2 to 0.5 mm and a basis weight of 30 to 60 g / m2, and the lower layer S1 and the upper layer S2 ) Is a thermoplastic polyolefin-based long-fiber nonwoven fabric sheet in which polypropylene (PP) yarn alone or polyethylene (PE) yarn is mixed.

The upper layer S2 joined by the thermal embossing roll forms a continuous welded portion 11 and an unfused portion 12 in the longitudinal direction or the transverse direction and the fused portion 11 A width of 0.5 to 1.5 mm, an interval of 3 to 5 mm, and a bonding region formed in the nonwoven loop is 10 to 35% based on the total surface area.

The long fiber nonwoven fabric loop for a hook fastening member according to the present invention has a structure in which a multilayer long fibrous nonwoven fabric sheet formed by using a spunbond nonwoven fabric technique is formed by a heat embossing roll with a plurality of waveforms ) Or a straight fused portion is formed and bonded to each other, manufacturing cost is reduced according to a simple process system, and no separate adhesive is used, which is advantageous to environment.

In the long fiber nonwoven fabric loop for a hook fastening member according to the present invention, the lower web acting as the support layer is made of a long fiber nonwoven fabric sheet made of fibers having a low fineness, thereby increasing the density and lowering the air permeability, The upper web serving as a bonding layer with the hook is easy to position (position) when the final product is manufactured by using a long fiber nonwoven fabric sheet made of fibers having a higher fineness, And a horizontal detachment force (shear strength) are excellent, so that a strong fastening force with a hook and durability at repeated detachment are excellent.

1 is a perspective view showing a state in which a long fiber nonwoven fabric loop for a hook fastening member according to the present invention is attached to a fastener.
2 is a structural view showing a long-fiber nonwoven fabric loop for a hook fastening member according to the present invention.
3 is a cross-sectional view taken along the line A-A 'in Fig.

Hereinafter, a long-fiber nonwoven fabric loop for a hook fastening member according to the present invention will be described with reference to the drawings. It should be understood by those skilled in the art that the present invention may be embodied in many other forms without departing from the spirit or essential characteristics thereof. And this does not mean that the technical idea and scope of the present invention are limited.

1 to 3, the long fiber nonwoven fabric loop for a hook fastening member according to the present invention is a nonwoven fabric loop made of a spunbond long filament nonwoven fabric sheet of a multi-layer structure in which the lower layer S1 has a fineness 1 to 2 Wherein the upper layer S2 is a thermoplastic polyolefin-based long-fiber nonwoven fabric sheet having a fineness of 4 to 6 denier and the upper layer S2 is a thermoplastic polyolefin- The long-fiber nonwoven fabric sheet is bonded by a heat embossing roll.

In general, nonwoven webs can be formed by meltblowing, spunbonding, air-through bonding, hydroentangling, spunlacing, airlaying, Carding, and other suitable processes. The basis weight of the nonwoven web varies depending on the use of the web, and in most cases is about 300 g / m 2 or less, and the basis weight is calculated as the weight of all layers per unit area of the nonwoven web.

The present invention improves the vertical peel strength and horizontal shear strength of loop members using spunbond nonwoven fabrication techniques, and typically the spunbond nonwoven fabric is used for melt extrusion of thermoplastic resin extrudates Means a nonwoven fabric formed by quenching and drawn strands by high-velocity air, collected on a surface, and reinforced with filaments bonded by heat or pressure by application of an emboss pattern.

In addition, the long-fiber nonwoven fabric sheet used in the present invention basically utilizes the low elongation and high-strength characteristics of polypropylene (PP) long fibers, and it is possible to mix the long fibers of polyethylene (PE) In order to provide a multi-layered nonwoven fabric having excellent mechanical properties, the present invention is characterized in that a spunbond long-fiber nonwoven fabric web arranged as a lower layer (S1) and an upper layer (S2) on a continuously driven conveyor belt is laminated, Respectively.

That is, the present invention relates to a non-woven fabric loop in which a spunbond long-fiber non-woven fabric sheet is laminated and laminated in a multilayer (S1-S2), and a melt-blown non-woven fabric or an air- Since the adhesive force between the spunbond long-fiber web formed as the lower layer S1 and the upper layer S2 is strong and the manufacturing process is simple, quality control and physical property control can be easily performed. .

The laminated nonwoven fabric is thermally bonded to impart mechanical properties and shape stability. In other words, heat and pressure are applied through a heat calender roll to form a sheet by thermal bonding. The calender roll which forms the fused portion 11 on the upper layer S2 is formed by joining the lower layer S1 by forming the fused portion 11 in the upper layer S2 by the convex portion of the calender roll, And the roll contacted with the lower layer S1 is composed of a smooth roll having a smooth surface.

If the temperature of the calender roll exceeds a predetermined level, the sheet is thermally fused to the heated roll, and the sheet can not be produced. If the temperature is too low, the physical properties of the sheet are lowered. And the surface temperature of the roll is preferably about 130 to 165 ° C.

As used herein, the longitudinal direction refers to the machine direction (MD) and the transverse direction refers to the cross-machine direction (CD). It means the machine direction and the direction orthogonal to the machine direction.

As described above, the upper layer S2 joined to the lower layer S1 by the thermal embossing roll forms a plurality of continuous wavy or linear fused portions 11 and unfused portions 12 in the longitudinal or transverse direction , The fused portion 11 has a width of 0.5 to 1.5 mm and an interval of 3 to 5 mm and a bonding region formed in the nonwoven loop is set in a range of 10 to 35% based on the entire surface area, The surface area of the unfused portion 12 which is reduced due to the fusion portion 11 generated in the nonwoven fabric loop 10 can be ensured within a suitable range, .

Accordingly, the nonwoven fabric loop 10 of the present invention does not deteriorate the mechanical coupling force with the hook member and does not cause a separation phenomenon between the lower layer S1 and the upper layer S2, so that little lint is generated even when used repeatedly for a long time, In the case of bonding to a commonly used hook member, the peel strength is more than 1.0 N / inch and the horizontal desorption strength is more than 35 N / inch, which is superior to the conventional product.

In the long fiber nonwoven fabric loop of the present invention, the lower layer (S1) is formed of a thermoplastic polyolefin-based long-fiber nonwoven fabric sheet having a fineness of 1 to 2 denier and an upper layer (S2) The fineness is formed of a thermoplastic polyolefin-based long-fiber nonwoven fabric sheet of 4 to 6 denier.

As a result of many trial and error, it has been found that the use of a long fiber nonwoven fabric sheet made of fibers with a low fineness increases the density and low air permeability of the lower layer S1 serving as a supporting layer with the base material, The upper layer S2, which is advantageous for the assembly process of the final product and serves as a bonding layer to the hook, has a vertical peel strength and a shear force (shear) by using a long fiber nonwoven fabric sheet made of fibers of higher fineness strength and the like, it is found that it has excellent durability in repetitive desorption as well as strong fastening force to the hook.

For reference, a denier (D) represents the weight of a fiber or yarn of 9,000 m in units of g, which is a unit representing the degree of fineness of a fiber or yarn, and a polyolefin fiber such as polypropylene (PP) The diameter is known to be about 0.0124716301 cm. The spunbond long-fiber nonwoven fabric, which is typically used as a loop, has a fiber thickness of 2.5 denier or less and flexibility of the nonwoven fabric at such a fineness. On the other hand, the fibers forming the melt-blown nonwoven fabric have a thickness of 0.1 to 0.5 denier. The reason is that if the thickness of the fiber is thick, there is a disadvantage of strength and deterioration of touch.

However, in the present invention, the lower layer (S1) is formed of a thermoplastic polyolefin-based long-fiber nonwoven fabric sheet having a fineness of 1 to 2 deniers and the upper layer (S2) has a fineness of 4 to 6 denier and the lower layer S1 and the upper layer S2 are thermally fused to each other by the embossing rolls so that the adhesive force between the spunbond long-fiber webs is higher than that between the different materials. It is stronger than the adhesive force, and the manufacturing process is simple, so that the quality control and physical property control are easy, and the production cost is reduced.

In the present invention, the nonwoven fabric sheet bonded with the lower layer S1 and the upper layer S2 is formed to have a thickness of 0.2 to 0.5 mm and a basis weight of 30 to 60 g / m 2, And it was found that the nonwoven fabric loop layer 10 as described above was not only economically costly to manufacture various disposable products but also hardly produced lint even when used repeatedly for a long time. The lower layer S1 and the upper layer S2 are made of a long fiber nonwoven fabric sheet made of a thermoplastic polyolefin resin in which a polypropylene (PP) yarn alone or a polyethylene (PE) yarn is mixed, Of course.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it should be understood that the invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

[Example]

(Width: 1000 mm) of a lower layer (S1) and an upper layer (S2) each having a fineness of 1 to 2 D and 4 to 6 D were melt-spun by a polypropylene resin, The upper layer (S2) sheet was fed to a thermal emboss roll having a wave pattern on an upper roll to produce a long-fiber nonwoven fabric loop bonded at a thickness of 0.26 to 0.37 mm and a basis weight of 35 to 50 g / m 2. By setting the width of the fused portion formed continuously in the longitudinal direction on the web of the upper layer (S2) by the embossing roll to 1.0 mm and the interval between the fused portions to be about 4 mm, the bonding region formed in the non- 20% and the unfused portion is about 80%. The nonwoven fabric loops having different fiber thicknesses (fineness D) of the long fiber nonwoven fabric sheets forming the lower layer S1 and the upper layer S2 were prepared as shown in Table 1 below.

division Example 1 Example 2 Example 3 Example 4 The upper layer (S2) 4D 5D 6D 4D 5D 6D 4D 5D 6D 4D 5D 6D The lower layer (S1) 1D 1.3D 1.7D 2D

[Comparative Example]

The nonwoven loop products of the same type with the highest market share are selected and compared with the products according to the embodiments.

[Experimental Example]

The weights, thickness, peel strength, shear strength, air permeability and the like of the products according to the examples and comparative examples were measured by the following methods, and the average values of the experimental results for the performance indexes are shown in Table 2 below.

- Weight: KS K 0514 [Method of measuring mass of cloth: small test method - mass of test specimen (g) / area of test specimen (㎠) x 10000]

- Thickness: KS K ISO 9073 [Textile - Nonwoven fabric test method - Part 2 thickness measurement]

- Peel Strength: LK-QC-T001 Peel Strength [Measuring detachment force by applying force in the direction of 180 ° between loop and hook,

- Shear Strength: LK-QC-T002 Tensile Shear Strength [Detachment force by applying linear force to loop and hook]

- Air permeability: KS K ISO 9237 [Method of measuring air permeability of textile fabric - Flow rate of air flowing vertically through test specimen under constant area, pressure and time]

Performance indicator Example 1 Example 2 Example 3 Example 4 Comparative Example Basis weight (g / ㎡) 35 40 45 50 50 Thickness (mm) 0.26 0.29 0.32 0.37 0.38 Peel strength (N / inch) 1.4 2.0 2.3 2.7 1.1 Shear Strength (N / inch) 38 45 48 53 33 Air permeability (cfm) 380 350 300 270 260

As shown in Table 2, when the experimental results of Examples 1 to 4 and Comparative Examples are compared, the peel strength and Shear strength of the Examples are superior to those of the Comparative Examples, and in particular, , But the strength was nearly twice as high as that of the comparative example. In addition, it was confirmed that the ventilation degree in the embodiment was kept below 400 as a whole, achieving the final development target. In contrast to Example 1, in the case of Example 4, the air permeability is somewhat lowered because the density is increased due to the higher basis weight, while the peel strength and shear strength are improved.

In addition, as a result of measuring safety according to Common Safety Standard No. 2017-0118 of Children's Product, it was found that chlorophenols 0.5 mg / kg or less [KS K 0733], phthalates 0.1% or less [gas chromatography mass spectrometry (GC-MS)], formaldehyde 20 mg / kg or less [KS K ISO 14184-1], heavy metals 0.1 mg / kg or less, and no detection of volatile organic compounds (VOCs) Of the total.

Accordingly, the long fiber nonwoven fabric loop for a hook fastening member according to the present invention has improved peel strength and horizontal shear strength as compared with the conventional embossed nonwoven fabric at the time of repeated attachment / detachment with the hook member, Since the loop member can be manufactured at a very low cost as well as greatly reducing the occurrence of lint, it can exhibit significantly improved quality and safety characteristics compared to conventional nonwoven loops. Therefore, disposable diapers as well as adult and infant personal wear, personal hygiene materials Disposable products such as clothes, bags, sporting goods, protective clothing, bed cover or surgical gown can be used in various uses and forms without departing from the technical idea of the present invention.

10: Filament Non-woven Loop
20: Hook
S1: Lower layer
S2: Upper layer
11: Fused portion
12: unfused portion

Claims (4)

In a nonwoven fabric loop made of a spunbond long-fiber nonwoven fabric sheet having a multilayer structure,
The lower layer S1 is a thermoplastic polyolefin-based long-fiber nonwoven fabric sheet having a fineness of 1 to 2 denier and the upper layer S2 is a thermoplastic polyolefin-based long-fiber nonwoven fabric sheet having a fineness of 4 to 6 denier, And the upper layer S2 are formed by mixing a polypropylene (PP) yarn alone or a polyethylene (PE) yarn,
The long fibrous nonwoven fabric sheet arranged as the lower layer (S1) and the upper layer (S2) is bonded by heat emboss roll at a thickness of 0.2 to 0.5 mm and a basis weight of 30 to 60 g /
The upper layer S2 forms a plurality of continuous wave or linear fused portions 11 and unfused portions 12 in the longitudinal or transverse direction and the fused portion 11 has a width of 0.5 to 1.5 mm, 3 to 5 mm, and the joint area formed in the nonwoven loop is 10 to 35% based on the total surface area.

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