KR100600499B1 - Elasticity and ventilation and watertight property laminated nonwoven composition object - Google Patents

Abstract

The present invention is to provide a nonwoven composite for use in body wear products, including disposable diapers, disposable coveralls, clothing, disposable patches, lamination bonding the elastic film and stretchable nonwoven fabric given waterproof, and partially stretched elastic Provided is a nonwoven composite having elasticity, breathability, and waterproofness inherent in the film.

Description

Lamination nonwoven composite with elasticity, breathability and waterproofness {ELASTICITY AND VENTILATION AND WATERTIGHT PROPERTY LAMINATED NONWOVEN COMPOSITION OBJECT}

1 is a conceptual view of processing to give biaxial stretch to a nonwoven fabric

Figure 2 is a lamination bonding and partially stretching device of the elastic film and the stretchable nonwoven fabric

Figure 3 (A) is a plan view of an embodiment of the nonwoven composite of the present invention, Figure 3 (B) is a cross-sectional view

Fig. 4 (A) is an adhesive distribution diagram of the nonwoven composite, and Fig. 4 (B) is a distribution diagram of the same breathable region.

Fig. 5 (A) is an adhesive distribution diagram of the nonwoven composite, and Fig. 5 (B) is a distribution diagram of the breathable region.

Explanation of Major Symbols

100 is an elastic film; 200 is a raw nonwoven fabric; 210 is a uniaxial stretchable nonwoven fabric; 220 is an extensible nonwoven fabric; 300 is a laminated nonwoven composite having elasticity, breathability, and waterproofness; 410, 411 and 413 are adhesive parts; 412 and 414 are breathable areas;

The present invention relates to a lamination nonwoven composite having elasticity, breathability, and waterproofness. In particular, it is intended to propose a low-permeability breathable film and a method of manufacturing the same, which can reduce the cost of the product and the manufacturing cost by simplifying the manufacturing equipment and process.

Conventional breathable film is widely used as disposable baby earmuffs, disposable sanitary napkins, general packaging materials, building materials and the like. Conventional manufacturing method of the conventional breathable film compounding 40 to 60% by weight of polyethylene and 60 to 40% by weight of calcium carbonate to obtain an inorganic material-containing resin in which the inorganic material is uniformly distributed, the inorganic material-containing resin to a thickness of 40 ~ 60㎛ It extrudes, an inorganic material containing film is shape | molded, the thickness of an inorganic material containing film is uniaxially stretched or biaxially stretched to 15-50 micrometers, and a breathable film is obtained.

A method of manufacturing a breathable film by uniaxially stretching a plastic polymer film in which US Pat. No. 6013151, an inorganic material is mixed, as a method of manufacturing a conventional breathable film as described above; Korean Patent Laid-Open Publication No. 2001-0012314 A technique for rolling an inorganic material-containing film by a rolling roll composed of a first roll and a second roll having a plurality of groove regions and tooth regions; Although a porous film having a concave-convex shape on its surface has been published by stretching a film composed of a mixture of an inorganic material and a polyolefin-based resin with an emboss roll and a rubber roll and stretching the film, the technique has been published. They need non-woven fabric equipment again for laminating nonwoven fabric and breathable film, adhesive material necessary for lamination, and loss caused by process separation process, so it will be competitive in the market of non-woven fabric breathable film, which is a competitive price product. I could not. In addition, a process of attempting to stretch a nonwoven fabric by in-line lamination of a nonwoven fabric and a breathable film (non-material-containing film) before stretching has been introduced. Was. In addition, Patent Publication No. 2002-70524 discloses a stretchable nonwoven fabric / elastic laminate in which an elastic film such as polyolefin-based elastomer is laminated on a nonwoven fabric such as polyethylene or nylon. BACKGROUND ART A film / nonwoven composite obtained by thermally bonding a breathable film of a polyolefin composite containing inorganic materials such as silica and silica to a fibrous polyolefin nonwoven web is disclosed.

As described above, the conventional manufacturing process of the breathable film is to shape the inorganic material-containing film, and then stretch the film to finely separate the interface between the inorganic material and the resin. The finely separated portions of the inorganic material and the resin distributed in the film exhibit water resistance to water but allow air or moisture to pass through. As the inorganic material mixed with the breathable film, several kinds of inorganic materials such as barium sulfate or talc may be used in addition to calcium carbonate, and polymers having very different compatibility may be used.

In addition, the stretching apparatus used in the manufacture of conventional breathable film was to stretch the film by doubling the speed of the stretching roll in the direction of travel when uniaxially stretching the film in the machine direction. The rolls and the film placed in the stretching equipment must be preheated for stretching, and the cooling apparatus and the aging roll must be installed to stabilize the properties of the film even after stretching, and the stretching apparatus as a whole becomes very complicated.

Biaxial stretching of breathable films requires more complex equipment. Specifically, in addition to the uniaxial stretching equipment, the film is placed in the width direction of the film with a clip, and the film is placed in the film while controlling the width of the film so that the film width becomes wider while the film proceeds in the machine direction. The present invention noted that the cost increase factor of the breathable film lies in the complexity of the stretching process and its equipment.

The present invention seeks to provide a lamination nonwoven composite incorporating low cost, high quality elasticity, breathability and water resistance for use in body wear products, including disposable diapers, disposable coveralls, clothing, disposable patches. To this end, the present invention does not use the conventional expensive stretching equipment. The present invention provides an elastic nonwoven composite by supplying an extensible nonwoven fabric to a cooling roll when forming an elastic film, and partially stretches the elastic film laminated to the nonwoven fabric in a pressure stretching roll to impart breathability. The present invention is to provide a lamination nonwoven composite incorporating low-cost, high-quality elasticity, breathability and waterproofness that can be highly competitive in the sharp price competition market by this technical innovation.

The nonwoven fabric composite incorporating elasticity, breathability, and waterproofness of the present invention includes an inorganic material-containing elastic film given elasticity and waterproofness; Nonwoven fabrics having inherent extensibility; A lamination portion bonding portion of the elastic film bonded to the stretchable nonwoven fabric in the elastic film forming process; It is a lamination nonwoven composite having elasticity, breathability and waterproofness composed of breathable regions distributed in an elastic film around a partial adhesive portion by lamination adhesion pressure.

Hereinafter, the present invention will be described in detail.

1. Elastic film (10) given elasticity and waterproofness to impart breathability

Waterproof film manufacturing technology for imparting breathability is published technology; Polyolefin polymers polymerized by polymerizing one or more olefin monomers including ethylene, propylene, butadiene, octene, hexene, butene, and alpha olefins; Inorganic materials including calcium carbonate, barium sulfate, silica, and talc are mixed, melted in an extruder, and formed into a film on a die. The film thus produced undergoes a stretching process, and fine pores are formed between the polymer and the inorganic material to give breathability and waterproofness.

The elastic film 10 having elasticity and waterproofness for imparting breathability to the present invention is provided with elasticity, breathability and waterproofness to the polymer film by using a part or all of the polyolefin-based inelastic polymer as the elastic polymer in the process of manufacturing the breathable film. Are manufactured.

Waterproofing method for imparting air permeability of the present invention, the method for producing the elastic film 10, polyolefin-based polymerized at least one olefin-based monomer comprising ethylene, propylene, butadiene, octene, hexene, butene, alpha olefin as described above 0 to 95 parts by weight of inelastic elastomer; 25 to 100 parts by weight of the elastic polymer; 5 to 70 parts by weight of an inorganic material including calcium carbonate, barium sulfate, silica, and talc; Prepared by melting in an extruder, forming a film in a die and cooling.

The elastic film given the elasticity and waterproofness for imparting the breathability of the present invention is bonded to the stretchable nonwoven fabric 21 with a lamination bonding portion at the same time as molding; The elastic film is partially stretched by lamination pressure to distribute the breathable area in the elastic film.

In the present invention, the elastic polymer, polyolefin elastomer prepared by polymerizing one or more olefin monomers such as ethylene, propylene, butadiene, alpha olefin, and olefins copolymerized with monomers having polar groups and the olefin monomers. And styrene and copolymers of the above olefinic monomers. In addition, in the present invention, an elastic polymer is also used in the nylon elastomer polyether elastomer, the polyurethane-based elastomer, and the like. The present invention uses the one or more elastomers to produce an elastic film.

2. Stretchable Nonwoven Fabric (22)

The nonwoven fabric laminated on the elastic film 10 is an extensible nonwoven fabric 22.

The raw nonwoven fabric 20 is a long fiber free tissue nonwoven fabric, which lacks extensibility, elasticity and waterproofness, and thus must be provided with extensibility. To give extensibility to the raw nonwoven fabric 20, the nonwoven fabric 20 is given by stretching, necking, scraping, shearing or stretching.

Nonwoven fabrics that can be used in the present invention include polypropylene thermal bond nonwovens, polypropylene spunbond nonwovens, polypropylene melt blown nonwovens, bicomponent nonwoven fabrics of polypropylene and polyethylene, polypropylene melt blown nonwovens and polypropylene spuns Bond nonwoven fabric, polyethylene nonwoven fabric, nylon nonwoven fabric with two or more layers of bond, bicomponent yarn mixed with polypropylene and polyethylene, polypropylene yarn, polyethylene yarn, viscose yarn, polyester yarn and nylon yarn There is a nonwoven fabric having a capacity of 5 to 180 g / m 2 selected from a nonwoven fabric, an airlaid nonwoven fabric, an air through nonwoven fabric, a spunlace nonwoven fabric, and a cotton yarn nonwoven fabric produced by mixing the above.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a state diagram of change of a nonwoven fabric having biaxial stretchability. Longitudinally stretch the raw nonwoven fabric 20 having the width W1 given in FIG. 1; The nonwoven fabric 22 which manufactures the uniaxially stretchable nonwoven fabric 21 whose width | variety is reduced by W2, and adjusts the width | variety of the uniaxial stretchable nonwoven fabric 21 to constant width W3, gives biaxial extensibility, and promotes soft property. Was prepared.

3. Laminated bonded elastic, breathable, waterproof nonwoven composite (30)

The inorganic material-containing elastic film 10 and the stretchable nonwoven fabric 22 are laminated to the nonwoven fabric 22 when the elastic film 10 is molded, and the elastic film is partially stretched in the nonwoven fabric lamination process to impart breathability.

In Fig. 2A, a lamination bonding and partial drawing apparatus is shown.

The inorganic material-containing elastic polymer material is melted in an extruder heated in steps of 170 ° C., 180 ° C., 200 ° C., 220 ° C., and 210 ° C., and is formed into an elastic film 10 in a die 52. The molded elastic film 10 is cooled while passing through the cooling rolls 53 and 54, and the stretchable nonwoven fabric is supplied to the elastic film 10 which is cooled by supplying the extensible nonwoven fabric 22 to the cooling rolls 53 and 54. (22) bonded to prepare an elastic nonwoven composite 30, and the elastic film bonded to the nonwoven fabric 22 of the elastic nonwoven fabric welfare body 30 is partially stretched in the rolling device 60 to give a breathable elastic nonwoven composite 40 is manufactured. The rolling apparatus 60 was comprised as the rolling roll 61 for partial elongation, and the elastic rubber roll 62 for pressing a film on a rolling roll. 2B is an enlarged view of the rubber roll 61 and the rolling roll 62, and FIG. 2C is an enlarged cross-sectional view of the rolling roll 62. As shown in FIG. Embossed patterns 63 for the stretched mark composition were arranged on the surface of the rolling roll 61. The rubber roll 62 presses the elastic film on the stretching roll 62. The pressure of the rubber roll 61 is controlled by a hydraulic mechanism such as a conventional stretching machine. The rubber rolls and the stretching rolls 61 and 62 interlock with the driving force to engage and rotate. When the inorganic material-containing film 10 adhered to the nonwoven fabric is supplied between the two rolls 61 and 62 in a pressurized state, the embossed pattern 63 of the rolling roll 62 penetrates the surface of the rubber roll 61 to form an elastic film ( At the same time, the rolled mark 41 is formed, and at the same time, the film around the stretched mark is stretched to form a breathable area. The pressurized embossed pattern may have various forms such as a line pattern, a cross line pattern, a circle pattern, a dot pattern, and the like. Embossed pattern 63 is processed so that the end is not sharp so that the elastic film is not damaged during the marking process. 3, the rolling mark 41 is formed by a striped embossed pattern 63 having a spacing of 3 mm and a height of 0.3 mm.

4 (A) partially stretches the nonwoven fabric composite 30 to which the elastic film 10 is attached, on the stretch roll 62 of the cross-pattern embossed pattern 63, and cross-stitch rolled marks 41 on the elastic film 10. FIG. Fig. 4B is a state diagram in which the air permeable region 43 is distributed around the crossing streaks. FIG. 5 (A) shows that the elastic film 10 of the nonwoven composite 30 is rolled as a drawing roll 62 having a circular relief pattern 63 formed thereon to give the film 10 a circular rolling mark 41. 5 (B) is a state diagram in which the breathable region 43 is distributed around the circle pattern.

Example 1

(1) Stretchable nonwoven fabric: A polypropylene spunbond nonwoven fabric having a width of 18 g / m 2 was longitudinally stretched to reduce the width of the abscissa to 1.5 m, and the width was again increased to 2.3 m to produce a stretchable nonwoven fabric.

② Elastic film: 58 parts by weight of calcium carbonate, 11 parts by weight of ethylene-propylene copolymerized elastomer, styrene-containing elastomer (Crayton product name: Creton D2122) 11.5 parts by weight, polyethylene 14 parts by weight, ethylene- 5 parts by weight of vinyl acetate copolymer (vinyl acetate content of 28%), 0.5 parts by weight of dispersant and additives are heated in a twinscrew extruder at 170 ° C, 180 ° C, 200 ° C, 220 ° C and 210 ° C so that the inorganic material is uniformly carried out. An inorganic material-containing resin was prepared, and the inorganic material-containing resin was melted in an extruder heated in steps of 160 ° C., 180 ° C., 210 ° C., 230 ° C., and 220 ° C. to form an elastic film having a thickness of 15 μm through T-die. .

(3) While the elastic film of ② was cooled in a cooling roll, the extensible nonwoven fabric of ① was supplied to a cooling roll, and the elastic film was extruded and laminated to the extensible nonwoven fabric.

④ After the adhesive lamination process, the elastic film bonded to the nonwoven fabric is supplied to a stretching apparatus equipped with a partial rubber roll and an embossed pattern to form a rolled mark as shown in FIG. 4 (B) on the elastic film to be elastic, breathable and waterproof. To prepare a lamination nonwoven composite embedded therein. As a result of examining the nonwoven fabric composite having the rolled mark, it was confirmed that the breathable area as shown in FIG. 4 (B) was distributed around the rolled mark.

Example 2

As in Example 1, a lamination nonwoven composite having elasticity, breathability, and waterproofness was prepared. However, the rolling process was performed twice.

Example 3

The nonwoven adhesive elastic film prepared in Example 1 was provided as a sample without rolling.

Experiment result

Water vapor permeability and water resistance of the composite prepared in Example 1 are shown in Table 1. Moisture permeability was measured to check breathability.

Table 1

Breathability (ASTM-E96) Water pressure (mbar) Example 1 630g / ㎡.day 73 Example 2 960g / ㎡.day 71 Example 3 80g / ㎡.day 73

When the nonwoven composite of Example 1 was held with both hands and pulled in the direction in which the elasticity was inherent, similar elastic elasticity to the fibrous fabric was found, unlike the raw nonwoven fabric. The amount of stretching was forcibly stretched to 10 cm in length and non-woven composite was restored to 10.2 cm in length.

Biaxial elasticity was confirmed in the nonwoven composite of Example 2.

As described above, the present invention provides an elastic nonwoven composite by supplying an extensible nonwoven fabric to a cooling roll when forming an elastic film, and sharply by the technical innovation of imparting breathability by partially stretching the elastic film laminated to the nonwoven fabric in a pressure drawing roll. It is to provide a lamination nonwoven composite with low price, high quality elasticity, breathability and waterproofness which can be highly competitive in one price competition market.

Claims (6)

In the thermally bonded laminate comprising a stretchable nonwoven fabric and an elastic film, An inorganic material-containing elastic film given elasticity and waterproofness; Nonwoven fabrics having inherent extensibility; A lamination portion bonding portion of the elastic film bonded to the stretchable nonwoven fabric in the elastic film forming process; A breathable region distributed in the elastic film around the partial adhesive portion by the lamination adhesive pressure; Lamination nonwoven composite with elasticity, breathability and waterproofness. [Claim 2] The polyolefin-based inelastic polymer according to claim 1, wherein the elastic film having elasticity, breathability, and waterproofness is polymerized by polymerizing one or more olefinic monomers including ethylene, propylene, butadiene, octene, hexene, butene, and alphaolefin. Parts by weight; 5 to 100 parts by weight of the elastic polymer; 5 to 70 parts by weight of an inorganic material including calcium carbonate, barium sulfate, silica, and talc; Melting in an extruder, forming a film in a die and cooling; Laminated nonwoven composite with elasticity, breathability and waterproofness. The method of claim 2, wherein the elastomeric polymer is a polyolefin elastomer prepared by polymerizing one or more olefin monomers such as ethylene, propylene, butadiene, and alpha olefins, and copolymerized monomers having polar groups with the olefin monomers. A lamination nonwoven composite incorporating elasticity, breathability, and water resistance, which is at least one of a elastomer, a styrene-based copolymer copolymerized with the olefin monomers, a nylon elastomer, a polyether elastomer, and a polyurethane-based elastomer. The nonwoven fabric of claim 1 wherein the extensible nonwoven fabric is a polypropylene thermal bond nonwoven fabric, a polypropylene spunbond nonwoven fabric, a polypropylene melt blown nonwoven fabric, a bicomponent nonwoven fabric of polypropylene and polyethylene, a polypropylene melt blown nonwoven fabric and a polypropylene spun Bond nonwoven fabric, polyethylene nonwoven fabric, nylon nonwoven fabric with two or more layers of bond, bicomponent yarn mixed with polypropylene and polyethylene, polypropylene yarn, polyethylene yarn, viscose yarn, polyester yarn and nylon yarn Laminated nonwoven composite with elasticity, breathability and water resistance, which is a nonwoven fabric having a capacity of 5 to 180 g / m2 selected from nonwoven fabric, airlaid nonwoven fabric, air through nonwoven fabric, spunlace nonwoven fabric and cotton yarn nonwoven fabric. The nonwoven fabric of claim 1, wherein the stretchable nonwoven fabric is longitudinally stretched from the raw nonwoven fabric; Preparing a uniaxial stretchable nonwoven fabric having a shrinkage in the transverse width; Lamination nonwoven composite with elasticity, breathability, and waterproofness that extends the contracted width of uniaxial stretchable nonwoven fabric to control width to give biaxial extensibility and promote soft properties. The lamination nonwoven composite according to claim 1, wherein elasticity, breathability, and water resistance in which the elastic film and the stretchable nonwoven fabric are bonded by stripes are embedded.

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