KR20220015719A - Non-adhesive sanitary pad - Google Patents

Abstract

Disclosed is an adhesive-free sanitary pad to provide increased adhesion. According to the present invention, the adhesive-free sanitary pad comprises: a waterproof sheet (110) having a lower surface attached to underwear; absorbent layers (120, 130) disposed on the upper surface of the waterproof sheet (110) to absorb secretions; and a top sheet (140) disposed on the upper surface of the absorbent layers (120, 130), coming in contact with the human body, and passing the secretions to the absorbent layers (120, 130).

Description

Non-adhesive sanitary pad {Non-adhesive sanitary pad}

The present invention relates to an adhesive-free sanitary napkin, and more particularly, to an adhesive-free sanitary napkin manufactured only by heat sealing without using an adhesive.

In general, sanitary napkins are used by women during menstruation to absorb large amounts of secretions such as men's fluid, blood, urine and other secretions. The sanitary napkin is designed to be placed close to the vulva of the body, and after it is attached to the underwear with adhesive or mechanically, it prevents secretions from leaking out and allows it to be absorbed by itself.

A conventional sanitary napkin puts a waterproof sheet for waterproofing on the part where it is attached to the panties, an absorbent body for absorbing secretions is disposed on the waterproof sheet, a mesh top cover is disposed on the upper surface of the absorbent body, and the rim area is sealed is manufactured by

Conventional sanitary napkins are made of a waterproof sheet made of polyethylene (PE), and a top cover made of polypropylene (PP), which is a non-woven fabric or rayon fiber. Since the waterproof sheet and the top cover have different materials, they were firmly adhered and sealed using an adhesive to prevent leakage of internal secretions to the outside. In addition, in order to improve the adhesive strength, the bonding area had to be increased.

However, since the sanitary napkin is in direct contact with a woman's sensitive body part, if an adhesive is used, it may cause skin troubles of the user, and may cause itching in the groin, thereby seriously harming the health of the user.

SUMMARY OF THE INVENTION An object of the present invention is to provide an adhesive-free sanitary napkin which can have as much sealing strength as a conventional sanitary napkin using an adhesive without using an adhesive.

The above objects and various advantages of the present invention will become more apparent from preferred embodiments of the present invention by those skilled in the art.

The object of the present invention can be achieved by an adhesive-free sanitary napkin. The adhesive-free sanitary napkin of the present invention includes: a waterproof sheet 110 having a lower surface attached to an undergarment; an absorption layer (120, 130) disposed on the upper surface of the waterproof sheet (110) to absorb secretions; It may include a top sheet 140 disposed on the upper surface of the absorbent layers 120 and 130 and in contact with the human body and allowing secretions to pass through the absorbent layers 120 and 130 .

Here, the top sheet 140 is formed of polypropylene (PP) nonwoven fabric, the waterproof sheet 110 is formed of functional metallocene linear low density polyethylene (LLDPE), and the absorption layers 120 and 130 are formed of pure cotton. .

At this time, the functional metallocene linear low-density polyethylene is 8% low density polyethylene (LLPE), first metallocene linear low density polyethylene 25%, second metallocene linear low density polyethylene 25%, third metallocene linear low density polyethylene It is formed by mixing 35%, 10% of high-density polyethylene (HDPE), and 2% of other materials.

Here, the first metallocene linear low-density polyethylene has a density of 0.916, a tensile strength of 420kg/cm2, an elongation of 770%, and a melting point of 119°C, and the second metallocene linear low-density polyethylene has a density of 0.915, a tensile strength of 450kg/cm2, It is preferable to have an elongation of 470% and a melting point of 114° C., and the third metallocene linear low-density polyethylene has a density of 0.918, a tensile strength of 500 kg/cm 2 , an elongation of 450%, and a melting point of 115° C.

The adhesive-free sanitary napkin according to the present invention was made of a functional metallocene linear low-density polyethylene that provides sufficient bonding strength only by thermally bonding the material of the waterproof sheet. Accordingly, it is possible to manufacture a sanitary napkin by bonding a waterproof sheet, a cotton absorbent layer, and a non-woven polypropylene without using a separate adhesive.

The adhesive-free sanitary napkin of the present invention prepared in this way has the advantage of exhibiting improved bonding strength compared to the conventional sanitary napkin using an adhesive.

Accordingly, the user can safely use the adhesive-free sanitary napkin of the present invention without worrying about skin problems or itching, which are caused when using the conventional sanitary napkin using the adhesive.

1 is a perspective view showing the configuration of an adhesive-free sanitary napkin according to the present invention;
2 is a cross-sectional view showing a cross-sectional configuration taken along line AA of FIG. 1;
3 is a perspective view showing the configuration of the absorbent layer of the adhesive-free sanitary napkin according to the present invention;
4 is a cross-sectional view showing a cross-sectional configuration taken along line BB of FIG. 1;
5 is a chart showing the content ratio of the waterproof sheet of the adhesive-free sanitary napkin according to the present invention;
6 to 16 are views showing test results of the waterproof sheet of the sanitary napkin without adhesive according to the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This example is provided to more completely explain the present invention to those of ordinary skill in the art. Accordingly, the shapes of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that the same members in each drawing are sometimes shown with the same reference numerals. Detailed descriptions of well-known functions and configurations determined to unnecessarily obscure the gist of the present invention will be omitted.

1 is a perspective view showing the configuration of a sanitary napkin 100 without an adhesive according to the present invention, and FIG. 2 is a cross-sectional view showing the configuration taken along line A-A of FIG. 1 .

As shown, the adhesive-free sanitary napkin 100 according to the present invention includes a waterproof sheet 110 , absorbent layers 120 and 130 disposed on the upper surface of the waterproof sheet 110 , and a top sheet 140 disposed on the absorbent layers 120 and 130 . ) is included.

An adhesive layer (not shown) and a protective film (not shown) for protecting the adhesive layer (not shown) are provided under the waterproof sheet 110 . After removing the protective film (not shown), the user attaches an adhesive layer (not shown) to the underwear to use the adhesive-free sanitary napkin 100 fixed to the underwear.

As shown in FIG. 1 , the adhesive-free sanitary napkin 100 is provided with a round heat sealing part (A) along the edge area, and a hinge heat sealing part (B) is provided along both sides of the leak prevention line. The adhesive-free sanitary napkin 100 according to the present invention is sealed with the same strength as when the adhesive is used by thermocompression bonding without using an adhesive.

Accordingly, it is possible to solve problems such as skin trouble and itching caused by the use of a sanitary napkin using an adhesive in the prior art, and there is an advantage that the user can use it with confidence.

The waterproof sheet 110 prevents the secretions absorbed in the absorbent layers 120 and 130 from leaking to the outside, and is combined with the absorbent layers 120 and 130 and the top sheet 140 to maintain the overall shape. In particular, the material of the waterproof sheet 110 of the present invention is improved so that it can be bonded to the top sheet 140 and the absorption layers 120 and 130 by thermocompression bonding without using an adhesive.

The waterproof sheet 110 of the present invention is made of functional metallocene linear low-density polyethylene (hereinafter, functional metallocene LLDPE) with improved bonding performance of conventional polyethylene (PE). This will be described in more detail below.

The absorption layers 120 and 130 absorb secretions including menstrual blood discharged from the human body. The absorption layers 120 and 130 are formed by stacking the first absorption layer 120 and the second absorption layer 130 vertically. The absorption layers 120 and 130 are provided between the waterproof sheet 110 and the top sheet 140 .

The absorption layers 120 and 130 may be formed by compressing cotton. In other words, it is formed using pure cotton, a material that is harmless to the human body and is environmentally friendly, rather than an absorbent containing chemicals. Here, the absorption layers 120 and 130 of the present invention may include an absorption distribution layer (ADL) capable of dispersing the absorbed secretions.

The top sheet 140 is disposed on the upper surface of the absorbent layers 120 and 130 and is in direct contact with the skin to pass secretions through the absorbent layers 120 and 130 . The top sheet 140 is formed in the form of a mesh through which secretions can pass. The topsheet 140 may be made of polypropylene (PP) nonwoven fabric.

In the adhesive-free sanitary napkin 100 of the present invention, the waterproof sheet 110, the absorbent layers 120 and 130, and the top sheet 140 are laminated, and a heat sealing device (not shown) is used to form the waterproof sheet 110 and the top sheet 140. The area is thermocompression-bonded to form a round heat sealing part (A). In addition, both sides of the inside are thermocompression-bonded to form a hinge heat sealing part (B).

At this time, the heat sealing apparatus is sealed by pressing at a pressure of 15 to 40 kgf/cm 2 and a heating temperature of 120 to 160°C.

The functional metallocene LLDPE used in the waterproof sheet 110 of the present invention is heat-sealed with sufficient strength with the polypropylene (PP) top sheet 140 at a temperature of 120 to 160 ° C. The excess is heat-sealed with sufficient strength.

At this time, as shown in FIG. 3 , a plurality of auxiliary adhesive strands 121 and 131 obtained by cutting a functional metallocene LLDPE film, which is a material of the waterproof sheet 110 , to have a predetermined length are irregularly formed on the absorbent layers 120 and 130 of the present invention. It is prepared by mixing.

When the first auxiliary adhesive strand 121 mixed with the first absorption layer 120 and the second auxiliary bonding strand 131 mixed with the second absorption layer 130 are thermocompressed from the heat sealing device, an absorption layer made of pure cotton material It melts in heat from the inside and improves the adhesion of the absorption layers 120 and 130 , the top sheet 140 , and the waterproof sheet 110 .

4 is a cross-sectional view illustrating a cross-sectional configuration taken along line B-B of FIG. 1 . As shown in FIG. 1 , the adhesive-free sanitary napkin 100 is provided with a plurality of dot sealing parts C on the surface to prevent the surface of the topsheet 140 from floating and to improve the adhesion of the entire sanitary napkin 100 .

The dot sealing part (C) is formed by sealing the waterproof sheet 110, the absorption layers 120 and 130, and the top sheet 140 to each other when the heat sealing device applies heat and pressure. 4, as the first auxiliary adhesive strands 121 and the second auxiliary adhesive strands 131 included in the first absorption layer 120 and the second absorption layer 130 are melted in heat, the top sheet 140 and It helps to improve the bonding strength of the waterproof sheet 110 and the absorbent layers 120 and 130 .

The functional metallocene LLDPE used in the waterproof sheet 110 of the present invention was tested by mixing five types of polyethylene (PE) with different physical properties in various mixing ratios as shown in FIG. It was manufactured by finding a specific ratio with excellent sealing performance.

Functional metallocene LLDPE of the present invention is low density polyethylene (LDLPE) 8%, first metallocene linear low density polyethylene 25%, second metallocene linear low density polyethylene 25%, third metallocene linear low density polyethylene 35%, It is manufactured by mixing 10% of high-density polyethylene (HDPE) with 2% of other materials.

8% of low-density polyethylene (LDPE) is mixed and has a characteristic of improving the heat-sealability of the waterproof sheet 110 . Low-density polyethylene (LDPE) has a density of 0.919, a melting point of 105° C., a tensile strength (breaking point) of 100 kg/cm 2 , and an elongation of 450%.

25% of the first metallocene linear low-density polyethylene is mixed and has excellent low-temperature sealing properties and mechanical properties. The first metallocene linear low-density polyethylene had a density of 0.916, a melting point of 119° C., a tensile strength (breaking point) of 420 kg/cm 2 , and an elongation of 770%.

The second metallocene linear low-density polyethylene is mixed with 20% to maintain the tensile strength and elongation of the thermal joint. The second metallocene linear low-density polyethylene has a density of 0.915, a melting point of 114° C., a tensile strength (breaking point) of 450 kg/cm 2 , and an elongation of 470%.

The third metallocene linear low-density polyethylene is mixed with 35% to improve thermal bonding strength. When the third metallocene linear low-density polyethylene is mixed in excess of 35%, the thermal bonding strength can be improved, but it is preferable to make the waterproof sheet 110 sticky so that it is mixed not to exceed 35%.

The third metallocene linear low-density polyethylene has a density of 0.918, a melting point of 115° C., a tensile strength (breaking point) of 500 kg/cm 2 , and an elongation of 450%.

High-density polyethylene (HDPE) is mixed with 10% and serves to aid in film forming and prevent curling. High-density polyethylene has a density of 0.957, a melting point of 132° C., a tensile strength (breaking point) of 290 kg/cm 2 , and an elongation of 500%.

Other materials are antistatic agents and slip agents. Other materials are mixed with 2%.

6 to 11 are test results of testing the performance of the functional metallocene LLDPE used in the waterproof sheet 110 of the present invention. Sample name 1 of FIG. 6 is a thermal paper in which the waterproof sheet 110 and the top sheet 140 of the sanitary napkin 100 without adhesive according to the present invention are bonded by heat sealing. In this case, the waterproof sheet 110 is a functional metallocene LLDPE, and the top sheet 140 is a polypropylene nonwoven fabric.

Sample name 2 is a functional metallocene LLDPE film, and sample name 3 is a specimen cut from a functional metallocene LLDPE film to a predetermined length.

As shown in FIG. 7, tensile strength and heat sealing strength were tested using sample name 1, elongation was tested using sample name 2, and mold shrinkage was tested using sample name 3.

8 shows respective test conditions for testing tensile strength and heat sealing strength, and FIG. 9 shows respective test conditions for testing elongation and mold shrinkage.

10 shows the results of testing the tensile strength of sample name 1 (a state in which a waterproof sheet and a top sheet are attached). As shown, the average tensile strength is 5.45N/mm2 as a result of performing the test 5 times.

11 shows the results of testing the heat sealing strength of sample name 1 (a state in which a waterproof sheet and a top sheet are attached). As shown, it can be seen that the heat sealing strength exceeds 1.00kgf/25mm as a result of performing five tests.

Considering that the standard sealing strength of a normal sanitary napkin is 0.5kgf/25mm, the top sheet 140 and the waterproof sheet 110 are only in a state in which the adhesive-free sanitary napkin 100 of the present invention is sealed by thermocompression bonding without using an adhesive. It can be seen that sufficient sealing strength is obtained.

Meanwhile, FIG. 12 is a result of testing the elongation of Sample No. 2 . As shown, the average elongation is 419.76% as a result of performing five tests. 13 is a result of testing the mold shrinkage rate of Sample No. 3; As shown, the average mold shrinkage rate is 1.53.

Meanwhile, FIG. 14 is a toxicity test result for the functional metallocene linear low-density polyethylene of the present invention. As shown, it can be seen that all of benzene, toluene, xamylene, acetone and formaldehyde were not detected.

That is, it can be seen that the waterproof sheet made of the functional metallocene linear low-density polyethylene of the present invention is harmless to the human body.

Meanwhile, FIG. 15 shows the heat sealing strength of the waterproof sheet 110 and the absorbent layers 120 and 130 of the sanitary napkin 100 without adhesive according to the present invention, and the heat sealing strength of the waterproof sheet and the absorbent layer of the sanitary napkin using the conventional adhesive. This is the experimental result.

For the experiment, as shown in FIG. 16 , a waterproof sheet 110 and an absorbent layer 120 bonded to a sealing width of 2 mm were used, and a weight (W) of 200 g was hung at the bottom to measure the heat sealing strength. At this time, when a weight W exceeding 200 g was used, the surface of the cotton pulp as the absorbent layer was peeled off, and a weight weight of 200 g was used.

As shown in FIG. 15 , as a result of performing three tests, it was found that the average sealing strength of the sanitary napkin using the adhesive was 0.98 kgf/25 mm, and the average sealing strength of the sanitary napkin without the adhesive of the present invention was 1.27 kgf/25 mm. Able to know.

That is, it can be seen that the sealing strength of the sanitary napkin of the present invention using the functional metallocene linear low-density polyethylene for the waterproof sheet 110 without using an adhesive is higher than that of the sanitary napkin using the conventional adhesive.

As described above, the adhesive-free sanitary napkin 100 according to the present invention has a heat sealing strength between the waterproof sheet 110 and the top sheet 140 as shown in FIG. 11 is higher than the standard sealing strength of 0.50kgf/25mm, As shown in FIG. 15 , the sealing strength between the waterproof sheet 110 and the absorbent layer 120 is also measured to be higher than that of a sanitary napkin using a conventional adhesive.

As described above, the adhesive-free sanitary napkin according to the present invention was made of a functional metallocene linear low-density polyethylene with sufficient bonding strength only by thermally bonding the material of the waterproof sheet. Accordingly, it is possible to manufacture a sanitary napkin by bonding a waterproof sheet, a cotton absorbent layer, and a non-woven polypropylene without using a separate adhesive.

The adhesive-free sanitary napkin of the present invention prepared in this way has the advantage of exhibiting improved bonding strength compared to the conventional sanitary napkin using an adhesive.

Accordingly, the user can safely use the adhesive-free sanitary napkin of the present invention without worrying about skin problems or itching, which are caused when using the conventional sanitary napkin using the adhesive.

The embodiments of the adhesive-free sanitary napkin of the present invention described above are merely exemplary, and those of ordinary skill in the art to which the present invention pertains will be aware that various modifications and equivalent other embodiments are possible therefrom. will be able Therefore, it will be well understood that the present invention is not limited to the form mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. Moreover, it is to be understood that the present invention covers all modifications, equivalents and substitutions falling within the spirit and scope of the invention as defined by the appended claims.

100: sanitary napkin without adhesive
110: waterproof sheet
120: first absorption layer
121: first adhesive auxiliary strand
130: second absorption layer
131: second adhesive auxiliary strand
140: top seat
A: Round heat sealing part
B: Hinge heat sealing part
C: dot sealing part

Claims (3)

a waterproof sheet 110 having a lower surface attached to the underwear;
Absorbent layers (120, 130) disposed on the upper surface of the waterproof sheet (110) to absorb secretions;
and a top sheet 140 disposed on the upper surface of the absorbent layers 120 and 130 and in contact with the human body and allowing secretions to pass through the absorbent layers 120 and 130,
The top sheet 140 is formed of polypropylene (PP) nonwoven fabric,
The waterproof sheet 110 is formed of a functional metallocene linear low-density polyethylene (LLDPE),
The absorption layers 120 and 130 are formed of a pure surface,
The functional metallocene linear low density polyethylene is low density polyethylene (LLPE) 8%, first metallocene linear low density polyethylene 25%, second metallocene linear low density polyethylene 25%, third metallocene linear low density polyethylene 35%, It is formed by mixing 10% of high-density polyethylene (HDPE) and 2% of other materials.
The first metallocene linear low-density polyethylene has a density of 0.916, a tensile strength of 420 kg/cm 2 , an elongation of 770%, and a melting point of 119°C,
The second metallocene linear low-density polyethylene has a density of 0.915, a tensile strength of 450 kg/cm 2 , an elongation of 470%, and a melting point of 114° C.,
The third metallocene linear low-density polyethylene is an adhesive-free sanitary napkin, characterized in that it has a density of 0.918, a tensile strength of 500 kg/cm 2 , an elongation of 450%, and a melting point of 115°C.
The method of claim 1,
The waterproof sheet 110, the top sheet 140, and the absorbent layers 120 and 130 have a round heat sealing part (A) bonded to each other along an edge area, and a hinge heat sealing part (B) formed along an internal leak prevention area (B) includes,
The adhesive-free sanitary napkin, characterized in that the round heat sealing part (A) and the hinge heat sealing part (B) are formed by heat sealing at a temperature of 15 to 40 kgf/cm 2 and 120 to 160°C.
3. The method of claim 2,
Adhesive-free sanitary napkins, characterized in that the adhesive auxiliary strands (121,131) obtained by pulverizing the functional metallocene linear low-density polyethylene are irregularly included in the absorption layer (120,130).

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