A disposable absorbent article

Abstract

A disposable absorbent article, comprising a waist region and a middle crotch region, the waist region comprising a laminate, the laminate comprising a non-woven fabric on the outside of the waist, a non-woven fabric on the inside of the waist and an elastic element therebetween, the waist region having a width direction the same as the elastic element's expansion and contraction direction and a length direction orthogonal to the width direction, the non-woven fabric on the outside of the waist comprising a first region and a second region, the average fiber density of the second region being greater than the average fiber density of the first region. The local fiber density is made higher than that of other regions, the region with a higher fiber density has a higher whiteness relative to the region with a lower fiber density, the regular arrangement of white dots forms a non-woven material with a visually similar pattern, the pattern is formed by arranging the fiber high-density region and the fiber low-density region according to a certain rule, and the disadvantage of the non-woven pattern formed by embossing that reduces the softness of the non-woven fabric can be avoided.

Description

Technical Field

[0001] The invention relates to a disposable absorbent article, in particular to a disposable absorbent article with improved waistline sense and softness and breathability. Background Art

[0002] In view of the problems of poor moisture absorption and perspiration removal effect, poor air permeability and single appearance of the existing non-woven fabrics for the waist of disposable pants-type absorbent articles, an analysis is conducted from the following aspects: 1. Poor moisture absorption and perspiration removal effect: The moisture absorption and perspiration removal effect of the non-woven fabrics for the waist of disposable pants-type absorbent articles is poor, which may be due to the fact that the material itself does not have good moisture absorption and perspiration removal properties, or the structural design is unreasonable, resulting in the inability to effectively discharge moisture; 2. Poor air permeability: Due to the poor air permeability of the non-woven fabric itself, or the lack of elements with good air permeability in the structural design, poor air permeability can easily lead to moisture and heat accumulation inside the diaper, increasing the user's discomfort; 3. Single appearance: The waist of disposable pants-type absorbent articles has a single appearance, which cannot meet consumers' needs for aesthetics and personalization. In the fiercely competitive market, the appearance design of the product is also one of the important factors to attract consumers. The existing technology easily reduces the softness and comfort of the waist through special printing, embossing and other processes. In summary, in view of the problems existing in the waist non-woven fabric of existing disposable pants-type absorbent articles, it is necessary to provide a disposable absorbent article that can simultaneously improve the waist feel, softness, and breathability. Summary of the invention

[0003] The invention provides a disposable absorbent article, in particular to a disposable absorbent article which improves waistline sense and is soft and breathable.

[0004] To achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a disposable absorbent article, the absorbent article includes a waist area and a middle crotch area, the waist area includes a front waist and a rear waist, the front waist and the rear waist both include a laminate, the laminate includes a non-woven fabric on the outside of the waist, a non-woven fabric on the inside of the waist, and an elastic element between the non-woven fabric on the outside of the waist and the non-woven fabric on the inside of the waist, a plurality of first joining portions and a plurality of first non-joining portions are arranged between the non-woven fabric on the outside of the waist and the non-woven fabric on the inside of the waist of the laminate, the waist area has a width direction which is the same as the stretching direction of the elastic element and a length direction which is orthogonal to the width direction, and is characterized in that the non-woven fabric on the outside of the waist includes a first region and a second region, and the average fiber density of the second region is greater than the average fiber density of the first region.

[0005] Preferably, the second regions are arranged in a column in the length direction and in a row in the width direction, one column has m1 second regions, and one row has m2 second regions; the maximum width of the second region in the width direction is Xd3, and the maximum length in the length direction is Yd3, the maximum width of the waist region in the expanded state in the width direction is XD, and the maximum length in the length direction is YD, and the second region satisfies one of the following conditions or all of the following conditions at the same time: ①m1*Yd3≤50%YD, ②m2*Xd3≤50%XD.

[0006] Preferably, the minimum spacing between two adjacent columns in the second area is D1, and the minimum spacing between two adjacent rows in the second area is D2; the first joining portion has a first joining width Xd1, and the first non-joining portion has a first non-joining width Xd2, D1=n1*Xd1-(Xd3-Xd2), n1 is any integer value from 1 to 5, D2=n2*Yd3, and n2 is an arbitrary value.

[0007] Preferably, n1 is any integer value from 1 to 3.

[0008] Preferably, the first joining width Xd1<the maximum width of the second region in the width direction is Xd3.

[0009] Preferably, the average fiber density of the nonwoven fabric on the inner side of the waistline is less than the average fiber density of the second area of ​​the nonwoven fabric on the outer side of the waistline; the first area contains thermoplastic fibers, and the second area includes at least one of thermoplastic fibers, natural fibers, and regenerated cellulose fibers.

[0010] Preferably, the second region includes a middle region and an edge region, and the average fiber density of the middle region is smaller than the average fiber density of the edge region.

[0011] Preferably, the number of fibers extending in the width direction of the first region is greater than the number of fibers extending in the length direction, and the transverse fiber content of the first region is 60%-100%; the transverse fiber content of the thermoplastic fibers in the second region is 40%-60%.

[0012] Preferably, the grammage of the first region is 10 gsm-16 gsm.

[0013] Preferably, the non-woven fabric on the outer side of the waist contains carbon fiber, the carbon fiber content in the first area is 0%-7%, the carbon fiber content in the second area is 1%-15%, and the carbon fiber content in the first area is less than that in the second area.

[0014] Preferably, the second region contains a fiber mass.

[0015] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: This technical scheme: 1. By setting the first area and the second area with different average fiber densities on the non-woven fabric outside the waist, the local fiber density is higher than that of other areas, and the area with higher fiber density has higher whiteness than the area with lower fiber density. The regular arrangement of white spots forms a non-woven fabric material with a visually similar pattern. The pattern is formed by arranging the fiber high-density area and the fiber low-density area according to a certain rule, which can avoid the disadvantage that the non-woven fabric pattern formed by embossing reduces the softness of the non-woven fabric; 2. By setting ①m1*Yd3≤50%YD, ②m2*Xd3≤ 50%XD; and the conditions of D1=n1*Xd1-(Xd3-Xd2), D2=n2*Yd3, so that the second area has a suitable density, which can improve the visual aesthetics; 3. The maximum lateral width of the second area is greater than the lateral width of the first non-joined portion. Because the average fiber density of the non-woven fabric inside the waist is less than the average fiber density of the second area of ​​the non-woven fabric outside the waist, moisture will be conducted from the non-woven fabric inside the waist to the non-woven fabric outside the waist. At the first joint, the non-woven fabric inside the waist is completely in contact with the non-woven fabric outside the waist. The joint has a better transmission effect due to the second area with high fiber density. The average fiber density of the first area of ​​the non-woven fabric outside the waist is less than that of the non-woven fabric inside the waist. The average fiber density has improved air permeability, which can make the sweat and water vapor on the non-woven fabric on the inside of the waistline diffuse better to the outside of the waistline, providing air permeability of the waistline and dryness of the non-woven fabric on the inside of the waistline; 4. By limiting the content rate of transverse fibers and longitudinal fibers in the first area and the second area and the gram weight of the first area, the non-woven fabric on the outside of the waistline has sufficient strength in the production and transportation direction and has good air permeability; 5. By adding carbon fiber to the second area or providing a second fiber layer containing carbon fiber on its lower side as a substrate, the second area of ​​the non-woven fabric on the outside of the waistline of the aforementioned scheme has a higher visual whiteness through the carbon fiber to improve the color difference or through the carbon fiber substrate for comparison, the pattern is more obvious and the appearance is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a stereogram of Example 1 of the present invention; Figure 2 It is a stereogram of Example 2 of the present invention; Figure 3 A cross-sectional view of a waist region laminate of a disposable absorbent article of the present invention; Figure 4 This is a rendering of the non-woven fabric on the outer side of the waistline of Example 3 of the present invention; Figure 5 This is a rendering of the non-woven fabric on the outer side of the waistline of Example 4 of the present invention; Figure 6 This is a rendering of the non-woven fabric on the outer side of the waistline of Example 5 of the present invention; Figure 7 This is a rendering of the non-woven fabric on the outer side of the waistline of Example 6 of the present invention; Figure 8 It is a cross-sectional view of the non-woven fabric portion on the outer side of the waistline of the present invention in the thickness direction; Fig. 9 A perspective view of a device for manufacturing a nonwoven fabric for the outer side of a waistline according to the present invention; Fig.10 This is a diagram illustrating an example of the front waist or back waist laminate of the present invention being unfolded. DETAILED DESCRIPTION

[0017] A disposable absorbent article 1 includes a waist region and a middle crotch region. The waist region includes a front waist region and a rear waist region, and the waist region may also include a portion of an absorbent body overlapping with the waist component. The front waist region and the rear waist region constitute the waist component. The front waist region and the rear waist region are both composed of a laminate, and the laminate includes a waist outer nonwoven fabric 111, a waist inner nonwoven fabric 112, and an elastic element 113 between the waist outer nonwoven fabric and the waist inner nonwoven fabric. The waist outer nonwoven fabric of the front and rear waist regions may be formed by an integrated nonwoven fabric sheet (external sheet) (and including the middle portion arranged in the crotch region of the absorbent body), or may be formed by two separate nonwoven fabric sheets.

[0018] like Figure 1-Figure 8 The non-woven fabric 111 on the outer side of the waist includes thermoplastic fibers and other fibers. The thermoplastic fibers are one of polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polylactic acid / polylactide (PLA) or conjugated fibers (such as PE / PET, PE / PP, PE / PLA). The other fibers are natural fibers or regenerated cellulose fibers. The non-woven fabric 111 on the outer side of the waist includes a first region 1111 and a second region 1112. The first region 1111 includes thermoplastic fibers, and the second region 1112 includes other fibers and thermoplastic fibers. The average fiber density of the second region 1112 is greater than the average fiber density of the first region 1111, and the second region 1112 has a central region 1112a and an edge region 1112b, and the average fiber density of the middle region 1112a is lower than the average fiber density of the edge region 1112b. By making the local fiber density higher than other areas, the color of the area is made whiter, the white spot phenomenon is more obvious, and the regular arrangement of the white spots forms a non-woven material with a visually similar pattern. The pattern is formed by arranging the fiber high-density area and the fiber low-density area according to a certain rule, which can avoid the disadvantage that the non-woven pattern formed by embossing reduces the softness of the non-woven fabric. The thickness of the second area is greater than that of the first area. One side of the waist non-woven fabric is relatively flat, and the second area on the other side has a greater thickness, so that the waist non-woven fabric forms a convex part in the second area, and the convexity is relatively gentle. A feasible solution in the second area 1112 is to add a fiber block in the second area, and the fiber block is preferably composed of natural fibers with good water absorption.

[0019] The non-woven fabric 111 on the outside of the waist has a width direction TD (i.e., transverse direction) which is the same as the expansion and contraction direction of the elastic element 113, which is also the production and transportation direction TD of the waist component, and a length direction MD (i.e., longitudinal direction) which is orthogonal to this direction. The second area 1112 can have a regular shape, such as a circle, a triangle, a flower shape, or a long strip. The second areas are regularly arranged on the non-woven fabric area of ​​the waist, and examples of a circle and a rectangle are shown in the embodiment.

[0020] The number of transverse fibers extending in the width direction TD of the first region 1111 is greater than the number of longitudinal fibers extending in the length direction MD. The content of transverse fibers in the first region 1111 is 60%-100%. The transverse fibers here refer to fibers whose absolute value of the angle between the direction of fiber length extension and the width direction is 0-45 degrees, and the longitudinal fibers refer to fibers whose absolute value of the angle between the direction of fiber length extension and the length direction is 0-45 degrees. The width direction is the direction of elastic expansion and production and transportation. Due to the need for online tension, the waist non-woven fabric material needs to have sufficient strength in the production and transportation direction to avoid damage. The ratio of thermoplastic fiber transverse fibers to longitudinal fibers in the second region 1112 is basically the same. The content of thermoplastic fiber transverse fibers in the second region 1112 is 40%-60%. The second region 1112 contains mixed thermoplastic and other fibers. The thermoplastic fibers have a reinforcing effect on the second region. This part includes thermoplastic fibers entangled with each other, thermoplastic fibers entangled with other fibers, and other fibers entangled with each other. The connection points between the thermoplastic fibers are generated by heating to make the second region have sufficient strength. The number of transverse fibers of other fibers in the second region is greater than the number of longitudinal fibers, so as to improve the strength in the production and transportation direction and avoid damage during production and transportation.

[0021] The average fiber density of the first area 1111 of the nonwoven fabric 111 on the outside of the waist is less than the average fiber density of the nonwoven fabric 112 on the inside of the waist, and the average fiber density of the second area 1112 of the nonwoven fabric 111 on the outside of the waist is greater than the average fiber density of the nonwoven fabric 112 on the inside of the waist. The nonwoven fabric 111 on the outside of the waist is joined with the nonwoven fabric 112 on the inside of the waist by a first joining portion 11a, and other areas outside the first joining portion 11a have a first non-joining portion 11b, and the lateral width of the second area 1112 is preferably greater than the width of the first non-joining portion 11b, so that the second area 1112 has a portion located on the first joining area 11a, and the body's sweat is absorbed by the nonwoven fabric on the inside of the waist because the average fiber density of the nonwoven fabric on the inside of the waist is less than the average fiber density on the second area of ​​the nonwoven fabric on the outside of the waist. Density, moisture will be transferred from the non-woven fabric inside the waist to the non-woven fabric outside the waist. The non-woven fabric inside the waist is in full contact with the non-woven fabric outside the waist at the first joint. The joint has a better transmission effect due to the second area with high fiber density. The average fiber density of the first area of ​​the non-woven fabric outside the waist is less than the average fiber density of the non-woven fabric inside the waist, which has improved air permeability and can make the sweat vapor on the non-woven fabric inside the waist diffuse better to the outside of the waist, providing air permeability of the waist and dryness of the non-woven fabric inside the waist. The weight of the first area is preferably 10gsm-16gsm. If the weight is too low, the strength cannot be guaranteed, and if the weight is too high, good air permeability cannot be guaranteed.

[0022] like Fig.10 The waist outer nonwoven fabric 111 and the waist inner nonwoven fabric 112 are connected by a plurality of first joining portions 11a extending longitudinally and arranged at intervals in the transverse direction. The first joining portion 11a has a first joining portion width Xd1, and the first non-joining area 11b has a first non-joining width Xd2. The maximum transverse width Xd3 of the second area 1112 can be less than, greater than or equal to the width Xd2 of the first non-joining portion 11b. Preferably, the transverse width Xd3 of the second area 1112 is greater than the width Xd2 of the first non-joining portion 11b. Fig. 9 The example of the second area with a rectangular shape is shown, and its maximum width is equal to the average width. Specify one of the second areas, the second area is in a column in the longitudinal direction, and its two sides are other columns in the transverse direction, the second area is in a row in the transverse direction, and its two sides are other rows in the longitudinal direction, and the second area has an imaginary line outside, and the imaginary line forms a first rectangular frame ( Fig. 9The imaginary rectangular frame just overlaps with the edge of the second area), the first rectangular frame has a longitudinal length and a transverse length, the transverse length is equal to the maximum width Xd3 of the second area 1112, and the longitudinal length is equal to the maximum length Yd3 of the second area 1112; the transverse spacing D1=n1*Xd1-(Xd3-Xd2) between the second area and another second area on the adjacent column, n can take any integer value from 1 to 5, preferably n=1-3; the longitudinal spacing D2=n2*Yd3 between the second area and another second area on the adjacent row, n can take any value. At the same time, the waist region of the disposable absorbent article 1 has a maximum transverse waist width XD and a maximum longitudinal length YD in the fully expanded state. Let m1 be the number of second regions 1112 in a single column, and m2 be the number of second regions 1112 in a single row. The preferred condition is: m1*Yd3≤ 50%YD, and the preferred condition is: m2*Xd3≤ 50%XD. The distribution of the second regions 1112 satisfies the first or second condition, or satisfies both the first and second conditions. The second regions are arranged in this way, and have a suitable density, which can improve the visual aesthetics. The preferred condition is: m1*Yd3≤ 40%YD, and the preferred condition is: m2*Xd3≤ 40%XD.

[0023] Another embodiment of the non-woven fabric on the outside of the waist includes carbon fibers, and the carbon fibers can be added in the second region 1112 in the form of fiber blocks; or the carbon fibers can be added in a mixed manner with the fibers of the first region and the second region. Preferably, the carbon fiber content of the first region is 0%-7%, and the carbon fiber content of the second region is 1%-15%. The carbon fiber content in the second region is higher than the carbon fiber content in the first region, so that the color depth of the second region with a high fiber content is deeper, the pattern is more obvious, and the aesthetics is better; or a second fiber layer containing carbon fibers is formed by mixing thermoplastic fibers with carbon fibers, and the second fiber layer is composited with the non-woven fabric structure on the outside of the waist of the aforementioned embodiment, and composited on the flat side of the non-woven fabric structure on the outside of the waist of the aforementioned embodiment. By adding the second fiber layer containing carbon fibers as a substrate, the second region of the non-woven fabric on the outside of the waist of the aforementioned embodiment has a higher visual whiteness, a more obvious pattern, and a better aesthetics.

[0024] Preparation method: Thermoplastic fibers and other fibers are applied separately by an application device. The other fibers and thermoplastic fibers are mixed by pre-mixing or jetting air flow to form a fiber web with thermoplastic fibers and other fibers, and a mixture of thermoplastic fibers. The fiber web is placed on the upper side of a mesh support component of a breathable support component. The breathable support component moves in the transport direction. A plurality of devices 2 for intermittently spraying gas are arranged on the moving fiber web to form a non-woven fabric on the outer side of the waistline of the implementation scheme. If the second area in the scheme contains fiber blocks, the application form is to add the fiber block structure. In another scheme, carbon fiber material is added, and the application method and the step of adding carbon fiber to the above-mentioned fiber step to achieve fiber mixing are easy to achieve according to the prior art.

[0025] When the spraying area is sprayed, it mainly corresponds to the area with only thermoplastic fibers, and can partially cover the edge of the area where the thermoplastic fibers are mixed with other fibers. The fibers in the spraying area move from the spraying area to the surrounding unsprayed areas, and the fiber web is subsequently reinforced and fixed by a heating mechanism.

[0026] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A disposable absorbent article, comprising a waist region and a middle crotch region, wherein the waist region comprises a front waist region and a rear waist region, wherein the front waist region and the rear waist region both comprise a laminate, wherein the laminate comprises a nonwoven fabric on the outside of the waist region, a nonwoven fabric on the inside of the waist region, and an elastic element between the nonwoven fabric on the outside of the waist region and the nonwoven fabric on the inside of the waist region, wherein a plurality of first joining portions and a plurality of first non-joining portions are arranged between the nonwoven fabric on the outside of the waist region and the nonwoven fabric on the inside of the waist region of the laminate, wherein the waist region has a width direction which is the same as the stretching direction of the elastic element and a length direction which is orthogonal to the width direction, and wherein: The nonwoven fabric outside the waistline comprises a first region and a second region, and the average fiber density of the second region is greater than the average fiber density of the first region.

2. A disposable absorbent article according to claim 1, characterized in that The plurality of second regions in the length direction form a column, and the plurality of second regions in the width direction form a row, one column has m1 second regions, and one row has m2 second regions; the maximum width of the second region in the width direction is Xd3, and the maximum length in the length direction is Yd3, the maximum width of the waist region in the expanded state in the width direction is XD, and the maximum length in the length direction is YD, and the second region satisfies one of the following conditions or all of the conditions at the same time: ①m1*Yd3≤ 50%YD, ②m2*Xd3≤ 50%XD.

3. A disposable absorbent article according to claim 2, characterized in that The minimum spacing between two adjacent columns in the second area is D1, and the minimum spacing between two adjacent rows in the second area is D2; the first joining portion has a first joining width Xd1, and the first non-joining portion has a first non-joining width Xd2, D1=n1*Xd1-(Xd3-Xd2), n1 is any integer value from 1 to 5, D2=n2*Yd3, n2 is an arbitrary value.

4. A disposable absorbent article according to claim 3, characterized in that The n1 is any integer value from 1 to 3.

5. A disposable absorbent article according to claim 3, characterized in that The first joining width Xd1<the maximum width of the second region in the width direction is Xd3.

6. A disposable absorbent article according to any one of claims 1 to 5, characterized in that The average fiber density of the nonwoven fabric inside the waistline is less than the average fiber density of the second area of ​​the nonwoven fabric outside the waistline; the first area contains thermoplastic fibers, and the second area includes at least one of thermoplastic fibers, natural fibers or regenerated cellulose fibers.

7. A disposable absorbent article according to claim 6, characterized in that The second region includes a middle region and an edge region, and an average fiber density in the middle region is smaller than an average fiber density in the edge region.

8. A disposable absorbent article according to claim 6, characterized in that The number of fibers extending in the width direction of the first region is greater than the number of fibers extending in the length direction, and the transverse fiber content of the first region is 60%-100%; the transverse fiber content of the thermoplastic fibers in the second region is 40%-60%.

9. A disposable absorbent article according to claim 8, characterized in that The first region has a grammage of 10 gsm-16 gsm.

10. A disposable absorbent article according to claim 6, characterized in that The non-woven fabric on the outer side of the waist contains carbon fiber, the carbon fiber content in the first area is 0%-7%, the carbon fiber content in the second area is 1%-15%, and the carbon fiber content in the first area is less than that in the second area.

11. A disposable absorbent article according to claim 6, characterized in that The second region contains a fiber mass.

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