KR20040099513A - Preservated air permeability elasticity non-woven fabric composition - Google Patents

Abstract

PURPOSE: A preserved air permeability elasticity non-woven fabric composite is provided to be applied to a disposable diaper, a sanitary napkin, pants, socks, a brassiere, a hair band and so on. CONSTITUTION: The preserved air permeability elasticity non-woven fabric composite(10) having an elastomer non-woven net(12) formed on a surface of a non-woven comprises an extensible non-woven(11); and an elastic polymer coating agent applied in a form of a thin film on a partial or full side of the extensible non-woven. The elastomer net is sandwiched in between the non-woven fabrics by attaching the non-woven fabrics with the elastomer non-woven nets in contact.

Description

Breathable Elastic Nonwoven Composite {PRESERVATED AIR PERMEABILITY ELASTICITY NON-WOVEN FABRIC COMPOSITION}

The present invention relates to an elastic nonwoven composite preserved breathability.

Technologies around nonwovens that give new functions to nonwovens are expanding the application of nonwovens. This is because nonwoven fabrics are much cheaper materials than woven fabrics and have softer properties than woven fabrics. Nonwovens are non-tissue fibers that do not have elongated properties and shrinkage elasticity. If the nonwoven fabric is provided with shrinkage elasticity, preserves the inherent breathability of the nonwoven fabric, and is provided at a low cost, it can be used as a material for manufacturing various personal goods. When the nonwoven fabric is observed with a magnifying glass, non-tissue fibers adhere to the truss type to suppress contraction and elongation. In order to provide extensibility to such inelastic nonwovens, deformation of truss fiber bonds is required by contracting the first or first and second axes of the nonwoven fabric. The necking amount of the nonwoven fabric is about half of the width of the given nonwoven fabric. Necking nonwovens are disclosed in US Pat. No. 4,962,122 as a document containing increasing nonwovens information. In addition, the nonwoven fabric may be wrinkled to reduce its width, or a sharing may be added to give the nonwoven fabric extensibility. Given only the inelastic extensibility described above for nonwovens, this function would be largely classified as a defect of nonwovens. If you want to use the expanding nonwoven fabrics for personal care products such as clothing parts, adhesives for pain treatment, diapers, it is necessary to combine shrinkage elasticity with the stretching properties of the nonwoven fabric. The elastic nonwoven fabric which can be used at this time is provided with the nonwoven fabric which spray-coated the elastic polymer on the extensible nonwoven fabric. However, they are sold at high prices and are only used for limited purposes. In general, extrusion injection of a highly viscous elastic polymer requires a significantly higher output (usually more than twice) of the extruder compared to olefinic polymers, and injectors and injection conditions also have various restrictions. If the elastic polymer is sprayed and coated on the extensible nonwoven fabric, it is understood that the elastic polymer should be added with a material for lowering the viscosity and an adhesive material for adhering to the nonwoven fabric and provided with expensive fine spinning equipment. As described above, the elastic nonwoven fabric manufacturing technique by spraying the elastic polymer has encountered various problems and cannot provide a low cost elastic nonwoven fabric.

The present invention seeks to provide an elastic nonwoven composite that retains breathability. The elastic nonwoven fabric of the present invention is produced by imparting return elasticity to the stretchable nonwoven fabric. The stretchable nonwoven fabric is obtained by necking a nonwoven fabric to impart first axis stretchability and second axis stretchability to the nonwoven fabric. The first axis stretch width and the second axis stretch width may be adjusted to be the same or different. Attention was given to a phenomenon in which an irregular elastic mesh was formed on the surface of the nonwoven fabric by applying a thin elastomeric film to the fiber bonding structure of the stretchable nonwoven fabric surface. To explain this phenomenon in detail, when an elastic polymer is coated with a suitable thin film on the surface of the nonwoven fabric, a coating agent is formed on the nonwoven file without forming a coating agent in the space between the nonwoven files, thereby forming an irregular elastic network. Defining this phenomenon can be referred to as an elastomeric nonwoven network in which piles coated with a coating are formed into irregular meshes. An object of the present invention is to provide an elastic nonwoven composite in which the elastic nonwoven network is distributed over the entire surface of the stretchable nonwoven fabric. An object of the present invention is to provide an elastic nonwoven composite provided with a portion of the stretchable nonwoven fabric according to a predetermined coating pattern. The present invention is to provide an elastic nonwoven composite that can form the elastic nonwoven network on one side of the nonwoven fabric and the stretchable nonwoven fabric on the other side. The present invention is to provide an elastic non-woven fabric composite sandwiched between two elastic non-woven fabric with an elastic non-woven fabric on one side of the elastic non-woven fabric between the elastic nonwoven fabric is sandwiched between the stretchable nonwoven fabric. The object of the present invention is to apply the breathable elastic nonwoven fabric prepared by the present invention to disposable articles such as disposable diaper cover, disposable sanitary napkin cover, panties of disposable sanitary napkin, panties, socks, bra, skin adhesive, headband, band, clothing, etc. It is to let.

1 is an embodiment gravure roll coating device

Figure 2 is an embodiment dipping coating device

Figure 3 is another embodiment coating device

Figure 4 is an embodiment of the lamination device of the elastic nonwoven fabric and elastic nonwoven fabric

Figure 5 is a lamination device of the elastic nonwoven fabric and stretchable nonwoven fabric

Figure 6 is a structure of an embodiment panties made of the present invention nonwoven fabric

Explanation of Major Symbols

10 is elastic nonwoven composite, 11 is stretchable nonwoven, 12 is elastic nonwoven

The present invention can be described by specifying an extensible nonwoven fabric, an elastic polymer used to impart elasticity to the extensible nonwoven fabric, a method of imparting an elastic nonwoven fabric to the nonwoven fabric, and a method of laminating an elastic nonwoven composite. The present invention will also cite materials that impart far infrared radiation to the elastomer. In addition, by using the breathable elastic nonwoven composite of the present invention will be presented a specific application method that can be used in personal care products.

1. Nonwoven

Stretching is given to the nonwoven fabric. When the width is reduced in one direction or orthogonal to the nonwoven fabric, the extensibility to extend to the original width is inherent. The present invention includes other stretchable nonwovens that are pleated or shredded. Nonwoven fabrics capable of imparting stretchability in the present invention include polypropylene thermal bond nonwoven fabrics, polypropylene spunbond nonwoven fabrics, polypropylene melt blown nonwoven fabrics, bicomponent nonwoven fabrics of polypropylene and polyethylene, polypropylene melt blown nonwoven fabrics and poly Nonwovens, polyethylene nonwovens, nylon nonwovens, polyester nonwovens, bicomponent yarns with polypropylene and polyethylene, polypropylene yarns, polyethylene yarns, viscose yarns, polyester yarns and nylon It can be used by giving extensibility to nonwoven fabric having a capacity of 5 ~ 180g / ㎡ including nonwoven fabric, airlaid nonwoven fabric, air through nonwoven fabric, spunlace nonwoven fabric, cotton yarn nonwoven fabric made by mixing one or more of the yarns. In consideration of price, function and the like in the present invention, polypropylene spunbond nonwoven fabric or nonwoven fabric provided with extensibility to polypropylene spunbond and melt blown nonwoven fabric formed of a multilayer is suitable. If the nonwoven fabric is already given extensibility it can be used without treatment to impart extensibility. Such nonwovens are generally expensive products.

2. Elastic Polymer

The elastic polymer coating of the present invention may be prepared from a hot melt coating or a fat soluble coating and a water soluble coating. The fat-soluble coating agent is an elastic copolymer including an olefin monomer such as ethylene-vinyl acetate copolymer, natural rubber, styrene, and olefin monomers such as ethylene, propylene, butene and at least one solvent such as toluene, ethyl acetate and methyl-ethyl-ketone. It is manufactured by melting materials including polyurethane and synthetic rubber. The materials are polymers that retain elasticity and are thermally adhesive when laminated with a nonwoven fabric.

The water-soluble elastomeric polymer coating agent is one in which an elastomeric polymer is dispersed in water or an alcohol; Polyester-based coating agent dispersed in water or alcohol; Nitrocellulose-based coatings dispersed in water or alcohol; Among the polyamide-based coatings dispersed in water or alcohol, materials having elasticity are selected and used. In water-soluble coatings, the polymer dispersed in the coating solution should be selected from a polymer having good thermal adhesion when laminated with a nonwoven fabric.

The hot melt coating polymer may be an elastic polymer used in the fat-soluble coating or the water-soluble coating.

In the present invention, the elastic coating agent should have a thermal adhesiveness with the nonwoven fabric in the state of the elastic non-woven network after coating. Lack of such secondary adhesion function increases the production cost because the nonwoven fabric and the adhesive for adhesion are used separately.

In the present invention, as a coating production equipment, a kneader, a ribbon blender, or a general stirrer is used.

The elastic coating agent may be used as a coating agent prepared by further adding at least one material selected from fragrance, deodorant, far-infrared radiant, degradable material, starch, organic material of chitosan, organic / inorganic antimicrobial agent.

3. Coating of elastomeric polymer

The elastic polymer coating agent is applied to the surface of the nonwoven fabric in a thin film to form an elastic nonwoven network on the surface of the extensible nonwoven fabric. The coating capacity to impart the coating agent is coated once or more than once so that the capacity of the elastic nonwoven network accumulated in the nonwoven fabric surface is 0.5 to 50 g / m 2.

The elastomeric polymer coating means may be performed by any one of gravure roll coating, dipping coating, or coating provided by supplying a coating agent in a thin film form at regular intervals.

1) roll coating

Roll coating is for forming an elastic polymer coating thin film on the nonwoven surface. Roll coating methods include gravure roll coating, reverse gravure roll coating, kiss roll anticorrosive coating, three stage roll coating. Elastomeric polymers are coated in a hot melt state or in a state in which the elastic polymer is dissolved in a solvent or dispersed in alcohol or water. However, when the coating agent has an appropriate viscosity and is applied to the nonwoven surface in the form of a thin film, it should be able to be reshaped into the elastic nonwoven network by the viscosity of the coating agent. If the coating amount exceeds the thin film, the coating liquid does not become a network but forms a film, and in this case, it becomes a choking elastic nonwoven fabric. The hot melt coating agent, the fat-soluble coating agent, and the water-soluble coating agent in which the elastic polymer is dispersed in water are easy to obtain an elastic nonwoven network by controlling the coating amount. However, the coating agent in which the elastic polymer is dispersed in alcohol should be careful about viscosity control. A nonwoven network can be obtained.

The coating amount for obtaining the elastic nonwoven network varies depending on the viscosity of the coating agent and is between 0.5 and 40 g / m 2. The coating amount is controlled in the gravure coating roll cited in FIG. 1 by applying the groove depth (volume) of the bottom roll surface immersed in the coating liquid 21 in the two rolls 31 and 32 to the extensible nonwoven fabric 11. The amount can be adjusted and can be adjusted by selecting the adhesion of the docker knife 33. In the case of adopting the dipping method, since the stretchable nonwoven fabric 11 is coated between the two rolls 41 and 42 immersed in the coating liquid 21 as shown in FIG. It is suitable for less coatings. Other coating methods cited in FIG. 3 provide a thin film on the surface of the stretchable nonwoven fabric 11 moving on the guide roll 52 in the comma coater 51 and the die, or in which a constant gap is maintained. While moving the stretchable nonwoven fabric between the main rolls, the coating agent is supplied in a thin film and coated, and the coating amount is controlled by controlling the supply amount of the coating agent.

4. Lamination of elastic nonwoven

The elastic polymer included in the elastic nonwoven fabric imparted to the stretchable nonwoven fabric of the present invention has a thermal adhesiveness that is melt-bonded at a melting temperature of 120 degrees C or less, so that the elastic nonwoven fabric and the elastic nonwoven fabric, or the elastic nonwoven fabric and the nonwoven fabric are easily laminated. can do.

4 is a device diagram for thermally bonding two elastic nonwoven composites 10 against the elastic nonwoven fabric 12. Specifically, two sheets of the elastic nonwoven fabric composite fabric 10 having the elastic nonwoven fabric 12 formed on the stretchable nonwoven fabric 11 are heated and pressed between the heating roll 61 and the compressed rubber roll 62 to be laminated. The lamination state is inserted into the sandwich between the two sides of the non-woven stretchable nonwoven fabric 11 in which the breathable elastic nonwoven fabrics 12 and 12 coincide with the elongation axis (if there is a major elongation axis, or the orthogonal elongation axis). Elastic nonwoven fabric 10a.

5 is a device diagram for laminating an extensible nonwoven fabric on one surface of an elastic nonwoven composite 10. Specifically, the elastic nonwoven fabric composite fabric 10 and the elastic nonwoven fabric 11 having the elastic nonwoven fabric 12 formed on the stretchable nonwoven fabric 11 are heated and pressed between the heating roll 61 and the compressed rubber roll 62 to be laminated. . The laminated state is the elastic nonwoven fabric 10b in which the breathable elastic nonwoven fabric 12 is sandwiched between the two sides of the nonwoven fabric 11 having the same extension axis.

5. Materials to give additional functions

1) Addition of far infrared radiation function

The elastic nonwoven fabric of the present invention is mainly used as a material for producing personal goods. It is known that the addition of far infrared radiation to a nonwoven fabric improves skin affinity.

The present invention may add materials to improve the skin affinity to the elastomeric coating composition. Materials for improving skin affinity are inorganic materials including elvan, biotite, talc, inorganic antibacterial agent, barium sulfate, jade powder, zeolite, activated carbon, silica and charcoal powder.

2) addition of deodorizing or fragrance function

The present invention may include a deodorant or a odorant in the elastic polymer coating composition to add a deodorant function or a odor function. Examples of the deodorant are inorganic deodorants including elvan, biotite, talc, and inorganic antibacterial agents, and absorbents of zeolite, activated carbon, silica gel and silica.

6. Application examples of the breathable elastic nonwoven fabric of the present invention

The elastic nonwoven composite of the present invention has several advantages such as woven fabric, but is characterized by low cost. This is because the raw material of the nonwoven fabric is significantly cheaper than that of the woven fabric and the nonwoven fabric production speed is very high at 150 m / min or more. The product of the present invention has the inherent breathability and softness of the nonwoven fabric, and furthermore, it can be used instead of the woven fabric because it also has elasticity. Therefore, the breathable elastic nonwoven composite of the present invention can be used as general clothing, panties, socks, bras, disposable diaper cover, disposable sanitary napkin cover, skin tight cloth, menstrual panties and the like. The breathable elastic nonwoven composite of the present invention has the advantage of good elasticity when used as the above-mentioned personal goods, good fit, low cost, and can be disposed of freely when contaminated. Therefore, the breathable elastic nonwoven fabric of the present invention can be used as a substitute for woven paper, and has a condition of a disposable product as a low-cost product. In addition, the nonwoven fabric of the present invention is easy to print the surface compared to the textile paper, it is possible to a variety of printing processing to increase the commerciality.

Example 1

30 parts by weight of the elastic polymer (Shell KRATON D1102) was dissolved in 70 parts by weight of toluene to prepare an elastic coating agent. The elastic coating prepared was repeatedly coated three times on the entire necking nonwoven fabric in a gravure roll. The capacity of the elastomeric nonwoven network after 9 coating dryings was 9 g / m 2.

Example 2

The elastic nonwoven fabric of Example 1 was bonded together with the main elastic axis, and the elastic nonwoven fabric was bonded together, and was laminated by heating and pressing in a paper roll. The heating temperature of the paper roll was 150 degrees Celsius and the pressing force of the rubber roll was 45 kg / cm <2>. The capacity of the elastic nonwoven network after lamination was 18 g / m 2.

Example 3

The panties of FIG. 6 were prepared from the elastic nonwoven fabric of Example 2. Fig. 6A is a schematic perspective view of the panty and Fig. 6B is a schematic view of the developed panties. Zones a and b of the panties matched the main elongation axis of the nonwoven fabric in the X-axis direction, and zone c matched the main elongation axis of the nonwoven fabric in the Y-axis direction.

Example 4

The disposable baby diaper was attached to one side of the panties manufactured in Example 3 and then used as a diaper cover.

Example 5

The sanitary napkin was attached to the panties produced in Example 3 and used as menstrual panties.

Example Product Effect

1) The elastic nonwoven fabric of Example 1 was cut into a long rectangle (10 cm x 30 cm) in the direction of the main elongation axis, and the length of 30 cm was increased to 38 cm and then returned to its original state. Again, the elastic nonwoven fabric of Example 1 was cut into 5cm squares on both sides and stretched to 8cm in the direction of the main elongation axis to shrink to 6cm in length. When the air was blown with the elastic nonwoven fabric in the mouth, the air passed through the elastic nonwoven fabric.

2) The elastic nonwoven fabric of Example 2 was cut into a long rectangle (10 cm x 30 cm) in the elongation width direction, and the length of the 30 cm length was increased to 38 cm and then returned to its original state. Again, the elastic nonwoven fabric of Example 1 was cut into both sides 5cm square and stretched to 8cm in the direction of the elongation axis to shrink to 6cm in length. When the air was blown with the elastic nonwoven fabric in the mouth, the air passed through the elastic nonwoven fabric.

3) When the panties of Example 3 were worn on the baby as a diaper cover, the panty-type cover adhered to the baby well, the diaper was not moved to the side after wearing, the breathability was smooth, and the skin affinity was good. Deterioration of the condition, or bad signs of the skin could not be found.

4) Ten women were used for the panties of Example 4 and the fit was listened to. The panty was tightly adhered to the skin of 10 women who wore it, felt little heterogeneity when moving, and breathable smoothly, and skin affinity was good. As a result of Example 4, the practicality that can be used as a men and women adult panties as well as menstrual panties was confirmed.

As described above, the present invention provides an elastic nonwoven composite that preserves breathability, and in particular, the present invention provides elasticity by an elastic nonwoven fabric obtained by applying a thin elastic polymer film to a part or the entire surface of a nonwoven fabric in a fiber bonding structure of a nonwoven surface. It provides an elastic nonwoven composite which is made of elastic nonwoven fabric on one side of the nonwoven fabric, and an elastic nonwoven composite on which the nonwoven fabric is stretched on the other side of the elastic nonwoven fabric. In order to provide an elastic nonwoven composite sandwiched between a stretchable nonwoven fabric and a stretchable nonwoven fabric in a sandwich form, it is possible to provide an elastic nonwoven composite material that can use various personal items.

Claims (11)

An elastic nonwoven composite preserved breathability, characterized in that an elastic nonwoven fabric is formed on the surface of the nonwoven fabric by applying an elastic polymer coating agent on a part or the entire surface of the nonwoven fabric. The breathable elastic nonwoven composite according to claim 1, wherein the elastic nonwoven composite is bonded to the elastic nonwoven composite so that the elastic nonwoven composite is sandwiched between the nonwoven fabrics. The breathable elastic nonwoven composite of Claim 1, wherein the elastic nonwoven fabric is bonded to the elastic nonwoven fabric of the elastic nonwoven composite to insert the elastic nonwoven fabric into a sandwich between the nonwoven fabrics. The breathable elastic nonwoven composite according to claim 1, wherein a capacity of the elastic nonwoven fabric provided to the nonwoven fabric is 0.5 to 50 g / m 2. The method of claim 1, wherein the elastomeric coating agent is a copolymer comprising ethylene-vinyl acetate copolymer, natural rubber, synthetic rubber, styrene in at least one solvent of toluene, ethyl acetate, methyl-ethyl-ketone, ethylene, propylene, butene Breathable elastic nonwoven composite characterized in that the oil-soluble coating prepared by melting at least one copolymer having a thermal adhesiveness and elasticity comprising. The method of claim 1, wherein the elastic polymer coating agent is an acrylic coating agent in which the elastic polymer is dispersed in water or alcohol; Polyester-based coating agent; Polyurethane-based coating agent; A breathable preserved elastic nonwoven composite characterized by being selected from polyamide coatings. The method of claim 1, wherein the coating agent is an elastic polymer coating prepared by adding at least one of a fragrance, a deodorant, a far-infrared radiating agent, a decomposable material, starch, an organic substance of chitosan, and an organic / inorganic antimicrobial agent. Elastic nonwoven composite. The method of claim 1, wherein the elastomeric coating agent is a hot melt coating agent polyurethane, ethylene-vinyl acetate copolymers, copolymers including styrene monomers, olefin monomers and monomers having a polar group copolymerized copolymer, olefin monomers The elastic nonwoven composite preserved breathability, characterized in that the copolymer is one or more copolymers having elasticity by melting at least one of the synthetic rubber or natural rubber used. Disposable straight diaper pads, disposable sanitary pads, disposable menstrual panties, panties, socks, skin adhesives, bras, bands, headbands, and other garments made using the elastic nonwoven composite of any one of claims 1 to 3. And personal items. A method of manufacturing an elastic nonwoven composite having a breathability preserved, characterized by forming an elastic nonwoven fabric on the surface of the nonwoven fabric by applying an elastic polymer coating agent at least once on a portion or the entire surface of the extensible nonwoven fabric. The method of claim 10, wherein the elastomeric coating means is performed by any one or more of gravure roll coating, dipping coating, coating provided by supplying the coating agent in a thin film form at the nozzle, or by coating the coating agent at regular intervals. Method for producing an elastic nonwoven composite preserved phosphorus breathability.