KR20240082052A - Nonwoven fabric composite having quick moisture-absorption and fast drying properties and article including the same - Google Patents

Abstract

A composite nonwoven fabric having absorbent quick-drying properties and an article containing the same are disclosed. The disclosed composite nonwoven fabric with absorbent quick-drying property includes a nonwoven fabric layer (A) composed of first thermoplastic resin fibers and a nonwoven fabric layer (B) composed of second thermoplastic resin fibers, and the pore size (Pa) of the nonwoven fabric layer (A). ) The ratio (Pb/Pa) of the pore size (Pb) of the non-woven fabric layer (B) to ) is 1.5 to 3.0, and the thickness of the non-woven fabric layer (B) to the thickness (Ta) of the non-woven fabric layer (A) ( The ratio of Tb) (Tb/Ta) is 1.0 to 3.0.

Description

Nonwoven fabric composite having quick moisture-absorption and fast drying properties and article including the same}

A composite nonwoven fabric having absorbent quick-drying properties and an article containing the same are disclosed. More specifically, a composite nonwoven fabric having absorbent quick-drying properties, which facilitates sweat discharge and has excellent drying properties compared to existing spunbond nonwoven fabrics, and an article containing the same are disclosed.

Spunbond nonwoven fabric for sanitary materials used in diapers or sanitary napkins is mainly applied to back sheets or waist bands.

The parts of the human body that come into contact with the backsheet or waistband must be non-toxic because they are the areas where the skin touches these backsheets or waistbands directly or the backsheets or waistbands are touched by hands. In particular, when the backsheet or waistband comes in contact with the skin, sweat can easily occur on the skin, so breathable products are preferred to speed up the evaporation of sweat.

Polyolefin-based nonwoven fabrics are widely used for sanitary materials because they are non-toxic, and because they ensure breathability, they are even more widely used for sanitary materials. However, most conventional polyolefin-based nonwoven fabrics are hydrophobic and breathable, but do not have the ability to easily discharge sweat to the outside of the nonwoven fabric. Therefore, when used in the summer or for long periods of time, sweat easily accumulates in the nonwoven fabric, causing rashes or sores on the skin. .

One embodiment of the present invention provides a composite nonwoven fabric with absorbent quick-drying properties, which facilitates sweat discharge and has excellent drying properties compared to existing spunbond nonwoven fabrics.

Another embodiment of the present invention provides an article comprising a composite nonwoven fabric having absorbent and quick-drying properties.

One aspect of the present invention is,

A nonwoven fabric layer (A) composed of first thermoplastic resin fibers; and

It includes a nonwoven fabric layer (B) composed of second thermoplastic resin fibers,

The ratio (Pb/Pa) of the pore size (Pb) of the non-woven fabric layer (B) to the pore size (Pa) of the non-woven fabric layer (A) is 1.5 to 3.0,

A composite nonwoven fabric is provided wherein the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) is 1.0 to 3.0.

The composite nonwoven fabric may have an absorption rate of 20 seconds or less.

The composite nonwoven fabric is a spunbond nonwoven fabric and may have an embossed pattern.

The composite nonwoven fabric has an embossing ratio of 11% to 18% and may include a plurality of embossed patterns arranged continuously and spaced apart from each other.

The composite nonwoven fabric may have a unit weight of 10 to 60 gsm.

Another aspect of the present invention is,

An article comprising the composite nonwoven fabric is provided.

The article may include sanitary materials.

The sanitary materials may include diapers, sanitary products, or masks.

The article may be configured such that the non-woven fabric layer (B) is disposed on the side that touches the skin of the human body.

The composite nonwoven fabric with absorbent and quick-drying properties according to an embodiment of the present invention facilitates sweat discharge and has excellent drying properties compared to existing spunbond nonwoven fabrics. Therefore, the composite nonwoven fabric can have a sufficient absorption rate and quick-drying properties to be used as a nonwoven fabric for sanitary materials.

In addition, the composite nonwoven fabric can be used in the backsheet of sanitary materials, the waist band of sanitary materials, or the top sheet of sanitary materials, thereby providing sanitary materials with excellent absorbency and excellent quick-drying properties. For example, the composite nonwoven fabric can be used as a part of sanitary materials such as diapers, sanitary pads, and masks.

Hereinafter, a composite nonwoven fabric having absorbent and quick-drying properties according to an embodiment of the present invention will be described in detail.

In this specification, “non-woven fabric composite” is a non-woven fabric laminate manufactured by individually manufacturing two or more types of non-woven fabrics and then going through a separate laminating (lamination) post-process, or two or more types of non-woven fabrics in one form. It is a concept that collectively refers to nonwoven fabrics manufactured through a continuous process and integrated (this is referred to as “monolithic non-woven fabric”).

Also, in this specification, “pore size of the nonwoven fabric layer” means the average size of pores existing in the nonwoven fabric layer.

Additionally, in this specification, “thickness of the non-woven fabric layer” means the average thickness of the non-woven fabric layer.

A composite nonwoven fabric with absorbent quick-drying properties according to an embodiment of the present invention includes a nonwoven fabric layer (A) composed of first thermoplastic resin fibers and a nonwoven fabric layer (B) composed of second thermoplastic resin fibers.

The first thermoplastic resin fiber and the second thermoplastic resin fiber refer to fibers made of thermoplastic resin. This thermoplastic resin may be of one type or may be composed of a plurality of thermoplastic resins.

The thermoplastic resin constituting the first thermoplastic resin fiber and the thermoplastic resin constituting the second thermoplastic resin fiber are each independently polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyhexamethylene terephthalate. aromatic polyester polymers and copolymers thereof; Aliphatic polyester polymers and copolymers thereof such as polylactic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polyhydroxybutyrate-polyhydroxyvalerate copolymer, and polycaprolactone; aliphatic polyamide-based polymers such as polyamide 6, polyamide 66, polyamide 610, polyamide 10, polyamide 12, and polyamide 6-12J, and copolymers thereof; polyolefin-based polymers and copolymers thereof such as polypropylene, polyethylene, polybutene, and polymethylpentene; A water-insoluble ethylene-vinyl alcohol copolymer-based polymer containing ethylene units in an amount of 25 mol% to 70 mol%; polystyrene-based polymer; Chlorine-based polymer; polyolefin-based polymer; polyester-based polymer; polyurethane-based polymer; polyamide-based polymer; Fluorine-based elastomer-based polymer; Or it may include a combination thereof.

In addition, the thermoplastic resin constituting the first thermoplastic resin fiber and the thermoplastic resin constituting the second thermoplastic resin fiber each independently include inorganic substances such as titanium oxide, silica, and barium oxide; Colorants such as carbon black, dyes, and pigments; flame retardants; Fluorescent whitening agent; Antioxidants; ultraviolet absorber; Or, it may contain various additives including combinations thereof.

In addition, in the composite nonwoven fabric, the ratio (Pb/Pa) of the pore size (Pb) of the nonwoven fabric layer (B) to the pore size (Pa) of the nonwoven fabric layer (A) is 1.5 to 3.0, and the nonwoven fabric layer (A) The ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of ) may be 1.0 to 3.0. The ratio of the pore size (Pb) of the non-woven fabric layer (B) to the pore size (Pa) of the non-woven fabric layer (A) (Pb/Pa) and the non-woven fabric layer to the thickness (Ta) of the non-woven fabric layer (A) If the ratio (Tb/Ta) of the thickness (Tb) of (B) is within the above range, a composite nonwoven fabric with a short drying time and a high transpiration rate can be obtained.

In addition, in the composite nonwoven fabric, the ratio (Pb/Pa) of the pore size (Pb) of the nonwoven fabric layer (B) to the pore size (Pa) of the nonwoven fabric layer (A) is determined by a method of adjusting the fiber spinning amount of each layer, or It can be adjusted by spinning the same fiber but varying the fiber stretching ratio, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) is each It can be controlled by adjusting the amount of fiber radiation in the layer.

The nonwoven fabric layer (A) and the nonwoven fabric layer (B) may be laminated with each other and then surface treated with a hydrophilic agent.

The hydrophilic agent may include a wax emulsion, a reactive softener, a silicone-based compound, a surfactant, or a combination thereof. The silicone-based compound may include silicone containing an amino group, silicone containing an oxyalkylene group, or a combination thereof. The surfactant is an anionic surfactant such as a carboxylate-based anionic surfactant, a sulfonate-based anionic surfactant, a sulfuric acid ester salt-based anionic surfactant, and a phosphoric acid ester salt-based anionic surfactant (especially alkyl phosphate ester salt). Surfactants; Polyhydric alcohol mono fatty acid esters such as sorbitan fatty acid ester, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, propylene glycol monostearate, N-(3-ole) (1oxy-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene glyceryl mono. Nonionic surfactants such as oleate, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, and polyoxyethylene lauryl ether: quaternary ammonium salts, amines Cationic surfactants such as salts or amines; Amphoteric surfactants, such as aliphatic derivatives of secondary or tertiary amines containing carboxy, sulfonate, or sulfate, or aliphatic derivatives of heterocyclic secondary or tertiary amines; Or it may include a combination thereof.

Specifically, the hydrophilic agent may be a nonionic hydrophilic agent.

The nonionic hydrophilic agent includes silicone-based compounds such as amino group-containing silicone and oxyalkylene group-containing silicone; Polyhydric alcohol mono fatty acid esters such as sorbitan fatty acid ester, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, propylene glycol monostearate, N-(3-ole) (1oxy-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene glyceryl mono. Nonionic surfactants such as oleate, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, and polyoxyethylene lauryl ether; Or it may include a combination thereof.

More specifically, the nonionic hydrophilic agent may include a surfactant (i.e., nonionic surfactant) having a solid content of 90% by weight or more.

Additionally, the composite nonwoven fabric may have an absorption rate of 20 seconds or less.

Additionally, the composite nonwoven fabric may be a spunbond nonwoven fabric. For example, the composite nonwoven fabric may be a spunbond nonwoven fabric with an embossed pattern.

Additionally, the composite nonwoven fabric may have an embossing ratio of 11% to 18%.

Additionally, the composite nonwoven fabric may include a plurality of embossed patterns arranged continuously and spaced apart from each other.

Additionally, the composite nonwoven fabric may have a unit weight of 10 to 60 gsm (g/m ² ).

Another embodiment of the present invention provides an article comprising the composite nonwoven fabric described above.

The article may include sanitary materials.

The sanitary materials may include diapers, sanitary products, or masks.

Specifically, the above-mentioned composite nonwoven fabric can be used as a part of sanitary materials such as diapers, sanitary pads, and masks. More specifically, the composite nonwoven fabric can be used in the backsheet of sanitary materials, the waistband of sanitary materials, or the topsheet of sanitary materials.

The article may be configured such that the non-woven fabric layer (B) is disposed on the side that touches the skin of the human body.

Hereinafter, the present invention will be described in more detail through examples. These examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

Example 1: Preparation of composite nonwoven fabric

A non-woven fabric layer (A) composed of first thermoplastic resin fibers (i.e., polypropylene fibers) is manufactured, a non-woven fabric layer (B) composed of second thermoplastic resin fibers (i.e., polypropylene fibers) is manufactured, and then these are laminated. This formed a composite layer. At this time, the manufacturing conditions of the non-woven fabric layer (A) and the non-woven fabric layer (B) were adjusted respectively to adjust the ratio of the pore size (Pb) of the non-woven fabric layer (B) to the pore size (Pa) of the non-woven fabric layer (A) (Pb/Pa). ) is 2.0, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was adjusted to be 2.0. Thereafter, the composite layer (i.e., a laminate of the non-woven fabric layer (A) and the non-woven fabric layer (B)) was placed on a calender roll in which the temperature of the upper roll on which the embossed pattern was formed was maintained at 162°C and the temperature of the lower roll was maintained at 158°C. was bonded to form a nonwoven fabric sheet. Thereafter, the formed nonwoven fabric sheet was surface treated with a hydrophilic agent (i.e., sorbitan fatty acid ester) and then dried by passing it through a dryer at 130°C. As a result, a composite nonwoven fabric with an embossing ratio of 11% was obtained.

Example 2: Preparation of composite nonwoven fabric

By adjusting the manufacturing conditions of the non-woven layer (A) and the non-woven layer (B), the ratio of the pore size (Pb) of the non-woven layer (B) to the pore size (Pa) of the non-woven layer (A) (Pb/Pa) 1.5, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was changed to 2.0, the same method as Example 1 above. A composite nonwoven fabric was manufactured.

Example 3: Preparation of composite nonwoven fabric

By adjusting the manufacturing conditions of the non-woven layer (A) and the non-woven layer (B), the ratio of the pore size (Pb) of the non-woven layer (B) to the pore size (Pa) of the non-woven layer (A) (Pb/Pa) 3.0, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was changed to 2.0, the same method as Example 1 above. A composite nonwoven fabric was manufactured.

Example 4: Preparation of composite nonwoven fabric

By adjusting the manufacturing conditions of the non-woven layer (A) and the non-woven layer (B), the ratio of the pore size (Pb) of the non-woven layer (B) to the pore size (Pa) of the non-woven layer (A) (Pb/Pa) 2.0, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was changed to 1.0, the same method as Example 1 above. A composite nonwoven fabric was manufactured.

Example 5: Preparation of composite nonwoven fabric

By adjusting the manufacturing conditions of the non-woven layer (A) and the non-woven layer (B), the ratio of the pore size (Pb) of the non-woven layer (B) to the pore size (Pa) of the non-woven layer (A) (Pb/Pa) 2.0, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was changed to 3.0, the same method as Example 1 above. A composite nonwoven fabric was manufactured.

Comparative Example 1: Preparation of composite nonwoven fabric

By adjusting the manufacturing conditions of the non-woven layer (A) and the non-woven layer (B), the ratio of the pore size (Pb) of the non-woven layer (B) to the pore size (Pa) of the non-woven layer (A) (Pb/Pa) 1.0, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was changed to 2.0, the same method as Example 1 above. A composite nonwoven fabric was manufactured.

Comparative Example 2: Preparation of composite nonwoven fabric

By adjusting the manufacturing conditions of the non-woven layer (A) and the non-woven layer (B), the ratio of the pore size (Pb) of the non-woven layer (B) to the pore size (Pa) of the non-woven layer (A) (Pb/Pa) 3.5, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was changed to 2.0, the same method as Example 1 above. A composite nonwoven fabric was manufactured.

Comparative Example 3: Preparation of composite nonwoven fabric

By adjusting the manufacturing conditions of the non-woven layer (A) and the non-woven layer (B), the ratio of the pore size (Pb) of the non-woven layer (B) to the pore size (Pa) of the non-woven layer (A) (Pb/Pa) 2.0, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was changed to 0.5, the same method as Example 1 above. A composite nonwoven fabric was manufactured.

Comparative Example 4: Preparation of composite nonwoven fabric

By adjusting the manufacturing conditions of the non-woven layer (A) and the non-woven layer (B), the ratio of the pore size (Pb) of the non-woven layer (B) to the pore size (Pa) of the non-woven layer (A) (Pb/Pa) 2.0, and the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) was changed to 3.5, the same method as Example 1 above. A composite nonwoven fabric was manufactured.

Comparative Example 5: Preparation of composite nonwoven fabric

A composite nonwoven fabric was manufactured in the same manner as in Example 1.

The ratio of the pore size (Pb) of the nonwoven layer (B) to the pore size (Pa) of the nonwoven layer (A) of the composite nonwoven fabric prepared in Examples 1 to 5 and Comparative Examples 1 to 5 (Pb/Pa), And the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) is shown in Table 1 below.

Example One 2 3 4 5 Pore size ratio (Pb/Pa) 2.0 1.5 3.0 2.0 2.0 Thickness ratio (Tb/Ta) 2.0 2.0 2.0 1.0 3.0 Comparative example One 2 3 4 5 Pore size ratio (Pb/Pa) 1.0 3.5 2.0 2.0 2.0 Thickness ratio (Tb/Ta) 2.0 2.0 0.5 3.5 2.0

Evaluation example: Evaluation of physical properties of composite nonwoven fabric

The physical properties of the composite nonwoven fabrics prepared in Examples 1 to 5 and Comparative Examples 1 to 5 were evaluated by the following method, and the results are shown in Table 2 below.

(1) Drying time: When the composite nonwoven fabric is wetted with a specified amount of liquid using ISO 17617 B method in a specified manner, the time it takes for the liquid to evaporate 100% under specified temperature, humidity, and pressure conditions is calculated by the weight of the composite nonwoven fabric. This was measured by measuring the change. At this time, the drying time of the composite nonwoven fabric prepared in Examples 1 to 5 and Comparative Examples 1 to 4 was measured by allowing the nonwoven fabric layer (B) to contact the liquid, and the drying time of the composite nonwoven fabric prepared in Comparative Example 5 was measured by contacting the nonwoven fabric layer (A) with the nonwoven fabric layer (A). The drying time was measured by bringing it into contact with this liquid.

(2) Transpiration rate: When composite nonwoven fabric is wetted with a specified amount of liquid using ISO 17617 method B using a specified method, the total amount of liquid evaporated after 60 minutes under specified temperature, humidity, and pressure conditions is calculated as the ratio of the composite nonwoven fabric. Measurement was made by measuring the weight change. At this time, the transpiration rate of the composite nonwoven fabric prepared in Examples 1 to 5 and Comparative Examples 1 to 4 was measured by bringing the nonwoven fabric layer (B) into contact with the liquid, and the composite nonwoven fabric prepared in Comparative Example 5 was measured by contacting the nonwoven fabric layer (A) The transpiration rate was measured by bringing it into contact with this liquid.

Example One 2 3 4 5 Drying time (minutes) 109 117 97 120 109 Increased production rate (%) 57 56 60 55 58 Comparative example One 2 3 4 5 Drying time (minutes) 138 137 140 160 165 Increased production rate (%) 44 45 43 42 38

Referring to Table 2, the composite nonwoven fabrics prepared in Examples 1 to 5 had a shorter drying time and a higher transpiration rate than the composite nonwoven fabrics prepared in Comparative Examples 1 to 5.

Although the present invention has been described with reference to examples, these are merely illustrative examples, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims (9)

A nonwoven fabric layer (A) composed of first thermoplastic resin fibers; and
It includes a nonwoven fabric layer (B) composed of second thermoplastic resin fibers,
The ratio (Pb/Pa) of the pore size (Pb) of the non-woven fabric layer (B) to the pore size (Pa) of the non-woven fabric layer (A) is 1.5 to 3.0,
A composite nonwoven fabric wherein the ratio (Tb/Ta) of the thickness (Tb) of the nonwoven fabric layer (B) to the thickness (Ta) of the nonwoven fabric layer (A) is 1.0 to 3.0. According to paragraph 1,
The composite nonwoven fabric is a composite nonwoven fabric with an absorption rate of 20 seconds or less. According to paragraph 1,
The composite nonwoven fabric is a spunbond nonwoven fabric having an embossed pattern. According to paragraph 3,
The composite nonwoven fabric has an embossing ratio of 11% to 18% and includes a plurality of embossed patterns arranged continuously and spaced apart from each other. According to paragraph 1,
The composite nonwoven fabric is a composite nonwoven fabric with a unit weight of 10 to 60 gsm. An article comprising the composite nonwoven fabric according to any one of claims 1 to 5. According to clause 6,
The above goods are goods containing sanitary materials. In clause 7,
The sanitary materials include diapers, sanitary products, or masks. In clause 7,
The article is configured such that the non-woven fabric layer (B) is disposed on the side that touches the skin of the human body.