Double-component spunbond non-woven fabric paper diaper

Abstract

The paper diaper comprises a surface layer, a core body, a bottom film and a bottom layer, the surface layer comprises an upper layer and a lower layer, the upper layer is composed of 8 gsm to 20 gsm of double-component spunbond non-woven fabric, the lower layer is composed of 18 gsm to 24 gsm of hot air non-woven fabric, the upper layer and the lower layer of the surface layer are attached together, embossed patterns with a protruding effect are pressed, and the embossed patterns are arranged on the surface layer. The fibers of the double-component spun-bonded non-woven fabric are long fibers. According to the paper diaper, the soft and comfortable effects can be achieved, and the cost is lower.

Description

Technical Field

[0001] The present invention relates to a disposable diaper, and particularly to a disposable diaper made of a bicomponent spunbond non-woven fabric. Background Art

[0002] At present, the softness and comfort of disposable diapers (such as pull-up pants, etc.) have become the main pursuit of consumers. Currently on the market, in order to achieve better soft characteristics of disposable diapers, the skin contact layer material mainly uses hot air non-woven fabric. The main raw material of this hot air non-woven fabric is polyethylene, and this material is mainly composed of short cut fibers, and the arrangement of the short cut fibers is not fluffy. Although the hot air non-woven fabric made of this material has a relatively soft hand feeling, when applied to sensitive parts, it will still cause discomfort to the user. The skin of infants is relatively sensitive. If the surface layer of the disposable diaper is not soft enough, it is easy to damage the skin of the infant's buttocks and is also easy to breed bacteria, resulting in red buttocks of the infant, etc. At present, the hot air non-woven fabric composite 3D surface layer with hot air non-woven fabric as the surface layer and the bottom layer is expensive, which hinders its further popularization and application. Summary of the Invention

[0003] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a disposable diaper that is softer and more comfortable and has a low cost.

[0004] According to the present invention, there is provided a disposable diaper, which includes a surface layer, a core body, a bottom film, and a bottom layer. The surface layer includes an upper layer and a lower layer. The upper layer is composed of a bicomponent spunbond non-woven fabric with a weight of 8 gsm to 20 gsm, and the lower layer is composed of a hot air non-woven fabric with a weight of 18 gsm to 24 gsm. The upper layer and the lower layer of the surface layer are bonded together and embossed with an embossed pattern with a raised effect. The fibers of the bicomponent spunbond non-woven fabric are long fibers.

[0005] Preferably, the fineness of the fibers of the bicomponent spunbond non-woven fabric is between 1.8 D and 2.0 D.

[0006] Preferably, the fibers are sheath-core type fibers containing polypropylene and polyethylene.

[0007] Preferably, the fibers include a sheath layer and a core layer. The material of the sheath layer is polyethylene, and the material of the core layer is polypropylene.

[0008] Preferably, the content of polypropylene accounts for 40% to 50% of the total mass of the bicomponent spunbond non-woven fabric, and the content of polyethylene accounts for 50% to 60% of the total mass of the bicomponent spunbond non-woven fabric.

[0009] Preferably, the core body is disposed below the surface layer, and the core body is a composite core body or a wood pulp mixed core body.

[0010] Preferably, a bottom film is provided below the core body, and the bottom film is glued to the lower surface of the core body by hot melt adhesive.

[0011] The disposable diaper of the present invention has the following technical effects:

[0012] The upper layer of the surface layer of the disposable diaper of the present invention that contacts the skin is composed of a bicomponent spunbond nonwoven fabric. The bicomponent spunbond nonwoven fabric is composed of longer fibers arranged more fluffily. The bicomponent spunbond nonwoven fabric is softer, less likely to fuzz, has better drying performance, and is more opaque, making it easier to conceal stains. When using the disposable diaper according to the present invention, the user's sensitive parts feel more comfortable. The surface layer of the disposable diaper that contacts the skin and is composed of both the bicomponent spunbond nonwoven fabric and the air-through nonwoven fabric is not only soft and comfortable, but also has a lower cost compared to the surface layer composed entirely of air-through nonwoven fabric, making it more competitive in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the disposable diaper according to the present invention in an unfolded state.

[0014] Figure 2 is a cross-sectional view showing the disposable diaper of the present invention.

[0015] Figure 3 is a structural diagram of the fibers of the bicomponent spunbond nonwoven fabric that constitutes the upper layer of the surface layer of the disposable diaper of the present invention that contacts the skin.

[0016] Figure 4 is a graph showing the diffusion test results of the bicomponent spunbond nonwoven fabric used in the present invention and the air-through nonwoven fabric used in the conventional technology. Among them, Figure 4 (a) is a graph showing the diffusion test results of the bicomponent spunbond nonwoven fabric of the present invention, Figure 4 (b) is a graph showing the diffusion test results of the air-through nonwoven fabric. DETAILED DESCRIPTION OF THE INVENTION

[0017] The technical solution of the present invention will be further described in detail below with reference to the drawings. In the following description, in order to determine the direction, expressions such as "up and down" are used. In the present invention, the direction perpendicular to the surface of the disposable diaper is defined as the up and down direction, and the direction towards the skin contact layer is "up". These expressions are used for the convenience of description and do not limit the protection scope of the present invention.

[0018] Figure 1 is a schematic diagram of the disposable diaper of the present invention in an unfolded state. The disposable diaper 10 according to the present invention includes a crotch portion 14, a rear waist portion 12, and a front waist portion 11. Fitting portions 13 are provided at the left and right ends of the rear waist portion 12, and a core body 15 is provided on the crotch portion 14. When in use, the fitting portions 13 at both ends of the rear waist portion 12 are end-fitted with the left and right ends of the front waist portion 11 to form a three-dimensional disposable diaper.

[0019] Figure 2 This is a schematic cross-section of the diaper of the present invention, specifically showing the Figure 1 cross-section at A-A in. According to the diaper of the present invention, it includes a surface layer 21, a core 15, a bottom film 22, and a bottom layer 23. Among them, the surface layer 21 is the layer in contact with the skin, which is composed of an upper layer 211 and a lower layer 212. Specifically, the upper layer 211 of the surface layer 21 is composed of a bicomponent spunbond non-woven fabric of about 8 gsm to 20 gsm (grams per square meter), and the lower layer 212 of the surface layer 21 is composed of a thermal bonded non-woven fabric of about 18 gsm to 24 gsm with a slightly larger weight. The upper layer 211 and the lower layer 212 of the surface layer 21 are bonded together to jointly form the surface layer of the diaper of the present invention, and at the same time, an embossed pattern with a 3D raised effect is pressed out to make the appearance of the diaper more beautiful. Among them, the upper layer 211 of the surface layer 21 is composed of long fiber materials, and the fiber arrangement is more fluffy, so the sensitive parts feel softer, while the thermal bonded non-woven fabric fibers of the lower layer 212 are shorter and the arrangement is not fluffy, so it is more conducive to obtaining a good embossing effect. The skin of infants is relatively sensitive. If the surface layer 21 of the diaper is not soft enough, it is easy to damage the skin of the infant's buttocks and is also easy to breed bacteria, resulting in red buttocks of the infant, etc. The surface layer 21 of the diaper composed of such a bicomponent spunbond non-woven fabric and a thermal bonded non-woven fabric can not only achieve a soft and comfortable effect, but also has a lower cost compared to the surface layer completely composed of a thermal bonded non-woven fabric. Any method can be used to manufacture the long fibers of the bicomponent spunbond non-woven fabric of the present invention, as long as the obtained fibers have the properties described in the present invention.

[0020] A core 15 is provided below the surface layer 21. The structure of the core 15 is well-known in the art, and its manufacturing process is also well-known. Preferably, the core 15 can adopt a composite core or a wood pulp mixed core. A bottom film 22 is provided below the core 15, and the bottom film 22 is glued to the lower surface of the core 15 by hot melt adhesive. Below the bottom film 22, a bottom layer 23 is provided, and this bottom layer 23 is the layer in contact with the air, that is, the outer layer of the entire diaper.

[0021] Figure 3Schematic cross-section of the fibers 20 of the bicomponent spunbond nonwoven fabric used to form the present invention. In the present invention, further, the fibers of the bicomponent spunbond nonwoven fabric are sheath-core type bicomponent fibers. The fiber 20 includes a sheath layer 31 and a core layer 32. The sheath layer 31 wraps the core layer 32, and the centers of the sheath layer 32 and the core layer 32 coincide. Among them, the sheath material is polyethylene (PE), and the core material is polypropylene (PP). Preferably, the fineness of the fibers of the above-mentioned bicomponent spunbond nonwoven fabric is between 1.8 D and 2.0 D (denier). Preferably, the content of the above-mentioned polyethylene accounts for 40% - 50% of the total mass of the bicomponent spunbond nonwoven fabric, and the content of the polyethylene accounts for 50% - 60% of the total mass of the bicomponent spunbond nonwoven fabric.

[0022] The inventor of the present invention also conducted softness tests and diffusivity tests on the upper layer material of the surface layer, that is, the bicomponent spunbond nonwoven fabric. Specifically as follows:

[0023] (1) Softness test

[0024] The NW254 type softness tester was used to conduct softness tests on the bicomponent spunbond nonwoven fabric used in the present invention and the hot air nonwoven fabric used in the traditional technology respectively. Five tests were conducted on both the transverse and longitudinal directions of each sample. The test principle is: when the test sample is pressed into the slit to a certain depth, the instrument records the maximum vector sum of the bending resistance of the test sample itself and the frictional force between the test sample and the slit. The smaller the instrument reading, the softer the test sample.

[0025] The various parameters used in this test and the test results are shown in the following table.

[0026] Table 1 Softness test results of bicomponent spunbond nonwoven fabric

[0027]

[0028] Table 2 Softness test results of hot air nonwoven fabric

[0029]

[0030] According to the above test results, it can be seen that the bicomponent spunbond nonwoven fabric used in the present invention is softer than the traditional hot air nonwoven fabric.

[0031] (2) Diffusivity test

[0032] 10 ml of brine was respectively introduced into the experimental materials with hot air nonwoven fabric and sheath-core bicomponent spunbond nonwoven fabric as the surface layer and non-woven dust-free paper as the lower layer (length and width are 250 mm × 75 mm). After 5 minutes, the size of the diffused area was observed. And the weight change of the surface layer before and after absorbing water was measured to test its water absorption capacity.

[0033] The testing process is as follows: First, take 4 experimental strips of 250 mm × 75 mm. The surface layer is a core-sheath type bicomponent spunbond non-woven fabric, and the lower layer is dust-free paper. Use a precision balance to measure and record the weight of the surface layer of the 4 experimental strips before absorbing water. Then, pour 10 ml of saline onto the 4 experimental strips respectively, let it stand for 5 minutes, and finally observe the diffusion area of the water on the surface layer, measure and record the weight of the surface layer after absorbing water.

[0034] The hot air non-woven fabric is also tested for water absorption in the same steps as above.

[0035] The test results of the water absorption capacity are shown in Table 3 below. For the final test results of the diffusivity, refer to Figure 4 .

[0036] Table 3 Test Results of Water Absorption Capacity of Bicomponent Spunbond Non-woven Fabric

[0037] Serial number Weight before water absorption / g Weight after water absorption / g Water absorption capacity / g 1 0.51 0.56 0.05 2 0.53 0.59 0.06 3 0.52 0.57 0.05 4 0.54 0.61 0.07 5 0.54 0.63 0.09 Average value 0.53 0.59 0.06

[0038] Table 4 Test Results of Water Absorption Capacity of Hot Air Non-woven Fabric

[0039] Serial number Weight before water absorption / g Weight after water absorption / g Water absorption capacity / g 1 0.67 0.80 0.13 2 0.67 0.74 0.07 3 0.69 0.87 0.18 4 0.69 0.91 0.22 5 0.71 0.87 0.16 Average value 0.69 0.84 0.15

[0040] Conclusion: When comparing the water absorption of materials of the same specification, adding 10 ml of normal saline of the same volume, the hot air non-woven fabric absorbs more water and is less dry as the surface layer of the product; the core-sheath bicomponent absorbs less water as the surface layer of the product and is more dry. According to the above test results, it can be known that the bicomponent spunbond non-woven fabric used in the present invention has better diffusivity and less water absorption than the traditional hot air non-woven fabric, and is more dry and comfortable to use.

[0041] In addition, the inventor also conducted a comparative experiment on the water absorption capacity when the upper layer of the surface layer is set as a hot air non-woven fabric and the water absorption capacity when the upper layer of the surface layer is a bicomponent spunbond non-woven fabric. The method used is the same as the above method. Among them, the test results of the bicomponent spunbond non-woven fabric of the present invention as the upper layer material of the surface layer are shown in Table 5, and the test results of the hot air non-woven fabric as the upper layer material of the surface layer are shown in Table 6.

[0042] Table 5 Test Results of Bicomponent Spunbond Non-woven Fabric as the Upper Layer Material of the Surface Layer

[0043]

[0044]

[0045] Table 6 Test Results of Hot Air Non-woven Fabric as the Upper Layer Material of the Surface Layer

[0046] Serial number Weight before water absorption Weight after water absorption Water absorption capacity 1 0.95 1.48 0.53 2 0.92 1.59 0.67 3 0.91 1.37 0.46 4 0.96 1.47 0.51 5 0.96 1.39 0.43 Average value 0.94 1.46 0.52

[0047] Conclusion: After the above two materials are used as the upper and lower layer materials of the surface layer and 3D embossed, the water absorption of the same specification materials is compared. After adding 10 ml of normal saline of the same volume, the hot air non-woven fabric absorbs more water and is not as dry as the product surface layer; the two-component spunbond non-woven fabric absorbs less water and is drier as the product surface layer. According to the above test results, in the present invention, the two-component spunbond non-woven fabric is used as the upper layer material of the surface layer, with less water absorption and better diffusibility, that is, it is drier and more comfortable.

[0048] The above content only represents a preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A disposable diaper, which comprises a surface layer, a core body, a bottom film and a bottom layer, and is characterized in that, the surface layer comprises an upper layer and a lower layer, the upper layer is composed of a bicomponent spunbond non-woven fabric of 8 gsm to 20 gsm, and the lower layer is composed of a hot air non-woven fabric of 18 gsm to 24 gsm, the upper layer and the lower layer of the surface layer are bonded together and embossed with an embossed pattern with a raised effect, the fibers of the bicomponent spunbond non-woven fabric are long fibers.

2. The disposable diaper according to claim 1, characterized in that, the fineness of the fibers of the bicomponent spunbond non-woven fabric is between 1.8 D and 2.0 D.

3. The disposable diaper according to claim 1, characterized in that, the fibers are sheath-core type fibers containing polypropylene and polyethylene.

4. The disposable diaper according to claim 3, characterized in that, the fibers comprise a sheath layer and a core layer, the material of the sheath layer is polyethylene, and the material of the core layer is polypropylene.

5. The disposable diaper according to claim 4, characterized in that, the content of polypropylene accounts for 40% to 50% of the total mass of the bicomponent spunbond non-woven fabric, and the content of polyethylene accounts for 50% to 60% of the total mass of the bicomponent spunbond non-woven fabric.

6. The disposable diaper according to any one of claims 1-5, characterized in that, the core body is arranged below the surface layer, and the core body is a composite core body or a wood pulp mixed core body.

7. The disposable diaper according to any one of claims 1-5, characterized in that, a bottom film is arranged below the core body, and the bottom film is glued to the lower surface of the core body by hot melt adhesive.

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