Waistline leakage-proof structure of paper diaper and paper diaper

Abstract

The paper diaper comprises a skin-friendly layer, a urine absorption product and a liquid-tight bottom layer which are sequentially arranged in a stacked mode, a waistline leakage-proof structure is arranged between the skin-friendly layer and the liquid-tight bottom layer, and the urine absorption product is arranged in an interlayer area between the skin-friendly layer and the waistline leakage-proof structure. The auxiliary core body and the main core body in the urine absorption product contain super water-absorbent resin in different proportions, the layered design is beneficial to rapid absorption of urine and prevention of back seepage, the leakage-proof performance is improved, the liquid-leakage-proof middle layer located at the bottom of the urine absorption product can isolate the main core body from the liquid storage core body, and the leakage-proof performance of the urine absorption product is improved. The main core body can bear a large amount of urine flowing out suddenly, so that the liquid storage core body cannot be polluted and lose efficacy, when the urine absorption product loses efficacy in side leakage prevention, solute concentration between the flow guide core body and the liquid storage core body is not uniform, surface tension changes accordingly, and due to the fact that the surface tension of liquid with different concentrations is different, the urine absorption product cannot be polluted. This may cause the liquid to flow along areas with lower surface tension.

Description

Technical Field

[0001] The present invention relates to the technical field of diapers, and in particular to a waist leakage prevention structure of a diaper and the diaper. Background Art

[0002] Diapers are disposable products made of non-woven fabrics, toilet paper, fluff pulp, polymer absorbent resin, PE film, rubber bands and other materials. There are two types: for infants and for adults. With the continuous improvement of production technology, diapers have been improved from the original single function of leak-proof and urine absorption to leak-proof, breathable, urine-absorbing and antibacterial, and have added multiple functions such as elastic waist, three-dimensional leak-proof partitions, etc.

[0003] Chinese patent announcement number CN105030423B discloses an adult diaper, which includes an outer cover, an absorbent body, a connecting mechanism, a leak-proof baffle wall and elastic leg bands. The absorbent body is inside the outer cover, and the connecting mechanism, the leak-proof baffle wall and the elastic leg bands are arranged on the outer cover; the upper end of the leak-proof baffle wall is provided with a baffle elastic band, and the lower end of the leak-proof baffle wall is fixed to the hydrophilic non-woven fabric by gluing; the absorbent body is composed of a first absorbent core close to the water-repellent bottom film and a second absorbent core close to the hydrophilic non-woven fabric; toilet paper is arranged between the water-repellent bottom film and the absorbent body; the middle part of the elastic leg band is arc-shaped; a rear waist elastic waistband is arranged on the outer cover at the rear of the absorbent body; and a front waist patch matching the magic buckle is arranged on the front waist area of ​​the bottom non-woven fabric. The advantages of this adult diaper are good comfort in use, the crotch is not easy to leak liquid, and the side leakage and rear leakage prevention effects are good;

[0004] Chinese patent announcement number CN101889924B discloses a diaper that is not easy to reverse osmosis, absorbs faster and has better effect, which includes a liquid-permeable surface layer, an absorbent body, a liquid-impermeable bottom layer, left and right waist stickers and a front waist sticker. The diaper has a lateral direction extending along the waistline direction and a longitudinal direction extending from the front waist area to the back waist area. The absorbent body is arranged between the liquid-permeable surface layer and the liquid-impermeable bottom layer, the left and right waist stickers are arranged on both sides of the liquid-impermeable bottom layer in the back waist area, and the front waist sticker is arranged on the outside of the liquid-impermeable bottom layer in the front waist area. The absorbent body is formed by stacking an upper dumbbell-shaped absorbent core and a lower absorbent core, the upper dumbbell-shaped absorbent core contains a super absorbent resin of 10% to 20% by weight, the lower absorbent core contains a super absorbent resin of 20% to 35% by weight, and the vertical projection area of ​​the lower absorbent core does not exceed one third of the upper dumbbell-shaped absorbent core;

[0005] The above technologies all adjust the water absorption amount of the upper and lower cores to achieve the purpose of leakage prevention, but the user's posture when wearing the diaper is not fixed. When there is a lot of instantaneous fluid accumulation, the excess urine will flow to the low-lying area under the action of gravity, which will still cause the diaper to leak sideways. When the user is in a lying or side-lying posture, urine will even leak out from the gap between the waist of the diaper and the skin, which not only greatly reduces the comfort of wearing, but also may contaminate the bedding.

[0006] In order to solve the above problems, the present invention provides a waist leakage prevention structure of a diaper and the diaper. Summary of the invention

[0007] (1) Technical issues to be solved

[0008] The purpose of the present invention is to overcome the technical problem that existing diapers are prone to side leakage. To this end, the present invention provides a waist leakage prevention structure of a diaper and a diaper.

[0009] (2) Technical solution

[0010] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0011] A waist anti-leakage structure, comprising a liquid storage core and a flow guiding core, wherein the area of ​​the flow guiding core is larger than that of the liquid storage core, the liquid storage core is located on one side of the middle of the flow guiding core, and the liquid storage core and the flow guiding core are fixed as an integral structure, so that the flow guiding core plays a role in guiding liquid to the liquid storage core;

[0012] The liquid storage core contains 55% to 75% by weight of super absorbent resin, the flow guiding core contains 75% to 85% by weight of improved fluff pulp, and both the liquid storage core and the flow guiding core are mixed with high elastic modulus fibers accounting for no less than 5% by weight.

[0013] Preferably, the method for preparing the improved fluff pulp comprises the following steps:

[0014] S1, mixing 1,2,3,4-butanetetracarboxylic acid and sodium dihydrogen phosphate to prepare a crosslinking agent solution;

[0015] S2, mixing the fluff pulp fiber with the crosslinking agent solution, reacting at a temperature of 200° C. to 240° C. and a pH value of 4 to 6 to obtain esterified crosslinked fluff pulp fiber;

[0016] S3, subjecting the esterified and cross-linked fluff pulp fibers to composite fluffing treatment to prepare improved fluff pulp.

[0017] Preferably, the adjacent surfaces of the flow-guiding core and the liquid-storing core are roughened.

[0018] The present invention also provides a diaper, comprising a skin-friendly layer, a urine absorbent product and a liquid-impermeable bottom layer stacked in sequence, wherein a waist leakage-proof structure as described above is arranged between the skin-friendly layer and the liquid-impermeable bottom layer, and the urine absorbent product is arranged in the interlayer area between the skin-friendly layer and the waist leakage-proof structure.

[0019] Preferably, the edge of the liquid-impermeable bottom layer is in contact with and fixed to the edge of the skin-friendly layer, so that urine in the diaper will not leak and contaminate clothing.

[0020] Preferably, the urine absorbing product consists of a secondary core, a liquid-tight middle layer and a main core located therebetween, the secondary core containing 12% to 25% by weight of super absorbent resin, and the main core containing 30% to 50% by weight of super absorbent resin.

[0021] Preferably, a plurality of holes and slots are arranged on the auxiliary core body, and adjacent holes and slots are arranged independently or in communication with each other, and the holes and slots are all in a structure of being wider at the top and narrower at the bottom.

[0022] Preferably, the edge of the liquid-tight middle layer is in contact with and fixed to the edge of the secondary core body, so that urine in the urine absorbent article will not leak into the waist leakage-proof structure.

[0023] (3) Beneficial effects:

[0024] A. The waist anti-leakage structure of the diaper and the diaper, the secondary core and the main core in the urine absorbing product contain super absorbent resins in different proportions, this layered design helps to quickly absorb urine and prevent back seepage, improves the anti-leakage performance, and the liquid-proof middle layer located at the bottom of the urine absorbing product can isolate the main core and the liquid storage core, the main core can bear a large amount of urine that suddenly flows out, so that the liquid storage core will not be contaminated and become ineffective;

[0025] B. The waist anti-leakage structure of the diaper and the diaper, when the urine absorbent fails to prevent side leakage, the solute concentration between the flow guide core and the liquid storage core is uneven, and the surface tension will change accordingly. Because the surface tension of liquids of different concentrations is different, this will cause the liquid to flow along the area with lower surface tension, thereby generating capillary flow to enhance the upward or downward trend of the liquid in the capillary phenomenon, so that urine can flow into the liquid storage core and be effectively locked in water;

[0026] C. The waist anti-leakage structure of the diaper and the diaper are improved by treating ordinary fluff pulp through esterification, cross-linking and composite villi treatment, which can improve the performance of the fluff pulp and make it perform better in water absorption and drainage. The adjacent surfaces of the drainage core and the liquid storage core are roughened, which increases the surface roughness and helps to improve the drainage effect between the drainage core and the liquid storage core. The drainage core containing a higher proportion of improved fluff pulp can absorb the side leakage liquid into the liquid storage core containing a higher proportion of super absorbent resin, which can effectively prevent urine from leaking from the waist and improve the overall anti-leakage performance of the diaper. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a waist anti-leakage structure of a diaper and a structure expansion of the diaper according to the present invention;

[0028] Figure 2 The present invention is a schematic cross-sectional view of a waist leakage prevention structure of a diaper and a side structure of the diaper.

[0029] The reference numerals are as follows: 100, skin-friendly layer; 200, urine absorbent product; 201, auxiliary core; 2011, hole groove; 202, liquid-proof middle layer; 203, main core; 300, liquid-impermeable bottom layer; 400, waist anti-leakage structure; 401, liquid storage core; 402, diversion core. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] The following is combined with Figure 1-2 The present invention is further described with examples:

[0032] Reference Figure 1-2 , a diaper, comprising a skin-friendly layer 100, a urine absorbing product 200 and a liquid-impermeable bottom layer 300 which are stacked in sequence;

[0033] Specifically, the skin-friendly layer 100 is made of non-woven fabric material, which provides a comfortable touch, reduces friction, is water-permeable and breathable, and can keep the skin dry. The liquid-impermeable bottom layer 300 is made of a polyethylene (PE) film or other waterproof materials, and has good water-impermeability while still allowing gas exchange to reduce moisture accumulation and maintain the breathability inside the diaper.

[0034] In this embodiment, a waist leakage prevention structure 400 is provided between the skin-friendly layer 100 and the liquid-impermeable bottom layer 300, and the urine absorbent product 200 is provided in the interlayer area between the skin-friendly layer 100 and the waist leakage prevention structure 400;

[0035] Specifically, the waist leakage prevention structure 400 is disposed between the skin-friendly layer 100 and the liquid-impermeable bottom layer 300 . After being worn, the waist leakage prevention structure 400 surrounds the waist area and can receive urine accidentally overflowed from the urine absorbing product 200 .

[0036] In this embodiment, the edge of the liquid-impermeable bottom layer 300 is in contact with and fixed to the edge of the skin-friendly layer 100, so that the urine in the diaper will not leak and contaminate the clothes;

[0037] Specifically, by contacting and fixing the edge of the liquid-impermeable bottom layer 300 with the edge of the skin-friendly layer 100, a sealed edge can be formed, which effectively prevents urine from leaking out from the side of the diaper.

[0038] In this embodiment, the urine absorbent product 200 is composed of a secondary core 201, a liquid-tight middle layer 202, and a main core 203 located therebetween. The secondary core 201 contains 12% to 25% by weight of a super absorbent resin, and the main core 203 contains 30% to 50% by weight of a super absorbent resin.

[0039] Specifically, the secondary core 201 contains a lower proportion of SAP, which enables the secondary core 201 to absorb urine quickly when it first contacts it and reduce the risk of side leakage. The main core 203 contains a higher proportion of SAP, which makes the main core 203 the main area for absorbing and storing urine and can absorb and lock a large amount of urine.

[0040] In this embodiment, a plurality of holes and slots 2011 are arranged on the auxiliary core 201, and adjacent holes and slots 2011 are arranged independently or in communication with each other, and the holes and slots 2011 are all in a structure of being wide at the top and narrow at the bottom;

[0041] Specifically, the hole groove 2011 structure which is wide at the top and narrow at the bottom is conducive to the downward flow of urine, while increasing the contact area with the absorbent material, improving the absorption efficiency, and being able to carry more instantaneous urine volume.

[0042] In this embodiment, the edge of the liquid-proof middle layer 202 is in contact with and fixed to the edge of the secondary core 201, so that the urine in the urine absorbent product 200 will not leak into the waist anti-leakage structure 400;

[0043] Specifically, the liquid-proof middle layer 202 is located below the main core 203, and its function is to prevent urine from penetrating from the main core 203 to the waist anti-leakage structure 400, ensuring that urine is effectively locked in the absorbent product.

[0044] Reference Figure 2 The present invention also provides a waist anti-leakage structure 400, comprising a liquid storage core 401 and a flow guiding core 402, wherein the area of ​​the flow guiding core 402 is larger than the area of ​​the liquid storage core 401;

[0045] Specifically, the flow guiding core 402 has a larger area and can cover a wider area, ensuring that urine is evenly guided to the liquid storage core 401 in the diaper, reducing leakage caused by local oversaturation. It is worth noting that the liquid storage core 401 and the flow guiding core 402 are both a mixture of super absorbent resin and fluff pulp blended in a certain proportion. By adjusting the proportion of super absorbent resin and fluff pulp in the core or adding other materials, the water absorption performance of the core can be changed to a certain extent.

[0046] In this embodiment, the liquid storage core 401 is located on one side of the middle of the flow guiding core 402, and the liquid storage core 401 contains 55% to 75% by weight of super absorbent resin;

[0047] Specifically, super absorbent resin (SAP) is a material with high water absorption, which can absorb and lock liquid equivalent to hundreds of times its weight. Using a high proportion of SAP in the liquid storage core 401 can ensure that the diaper has a strong urine absorption capacity. SAP not only has a strong water absorption capacity, but also has good water locking performance, which can prevent the absorbed liquid from flowing back, keep the surface of the diaper dry, and reduce the risk of urine leakage.

[0048] In this embodiment, the flow guide core 402 contains 75% to 85% by weight of improved fluff pulp;

[0049] Specifically, a high proportion of improved fluff pulp provides good flow conductivity, ensuring that urine can be quickly transferred from the skin-friendly layer 100 to the liquid storage core 401. At the same time, after special treatment, the water absorption and water retention of the improved fluff pulp are also improved, which can help urine spread quickly to a wider area, avoid urine concentration in a certain area of ​​the diaper, and reduce the risk of leakage;

[0050] In this embodiment, the liquid storage core 401 and the flow guiding core 402 are both mixed with high elastic modulus fibers accounting for no less than 5% by weight;

[0051] Specifically, high elastic modulus fibers can be made of polyester, dacron, etc., and the fiber shape can be cylindrical, hollow, irregular, etc., and these high elastic modulus fibers are evenly mixed into the basic absorbent material composed of fluff pulp, super absorbent resin, etc. In this way, the elastic modulus of the absorbent body can be significantly improved, making it less likely to deform, break and clump when subjected to external forces. Moreover, because this type of material has a higher elastic modulus, it can maintain a three-dimensional support structure and maintain the density of the absorbent body even after the absorbent body absorbs liquid, thereby improving the absorption rate of the product.

[0052] In this embodiment, the method for preparing the improved fluff pulp comprises the following steps:

[0053] S1, mixing 1,2,3,4-butanetetracarboxylic acid and sodium dihydrogen phosphate to prepare a crosslinking agent solution;

[0054] S2, mixing the fluff pulp fiber with the crosslinking agent solution, reacting at a temperature of 200° C. to 240° C. and a pH value of 4 to 6 to obtain esterified crosslinked fluff pulp fiber;

[0055] Specifically, the crosslinking agent can react chemically with the fluff pulp fiber to form esterification crosslinking. 200°C is a relatively high temperature, which helps to accelerate the chemical reaction. The environment with a pH value of 4 is acidic. Under such acidic conditions, the activity of the crosslinking agent is enhanced and it is easier to react with the fluff pulp fiber. After esterification crosslinking, the fluff pulp fiber has a more stable structure, and its mechanical strength, water resistance and water absorption are improved.

[0056] S3, subjecting the esterified and cross-linked fluff pulp fibers to composite fluffing treatment to prepare improved fluff pulp;

[0057] Specifically, the composite fluffing treatment can be performed by: breaking the fluff pulp fibers into smaller fibers by mechanical force to increase their surface area, improve water absorption and softness;

[0058] In this application, the testing standards / methods for the physical properties of fluff pulp are as follows:

[0059] Determination of dry bulk:

[0060] ① Weigh 10 grams of the air-dried weight of the fluff pulp and use a universal grinder to disperse it into single fibers;.

[0061] ② manually spreading the fluff pulp evenly on a former with holes at the bottom, the bottom diameter of the former is 50 mm, and the diameter of the hole is 1.5 mm;

[0062] ③ Then gently place a 50-gram weight on the upper part of the former to press down the fluff pulp. After 30 seconds, record the height of the sample as the fluff height h. The dry fluff is 0.655h.

[0063] Water absorption test:

[0064] ① Weigh 100 g of the fluff pulp by air-dry weight;

[0065] ② Place the modified fluff pulp sample in the test liquid and measure the amount of liquid it absorbs within 1 minute. The test shows that its water absorption rate reaches 350%.

[0066] Determination of water retention:

[0067] ① Weigh 100 g of the fluff pulp by air-dry weight;

[0068] ② The fluff pulp sample that absorbed the test liquid was placed in a liquid-free environment and the amount of liquid released within 10 minutes was measured. The test showed that its water retention rate reached 195.5%.

[0069] In this embodiment, the liquid storage core 401 and the flow guiding core 402 are fixed as an integral structure, so that the flow guiding core 402 plays a role in guiding the liquid to the liquid storage core 401, and the adjacent surfaces of the flow guiding core 402 and the liquid storage core 401 are roughened;

[0070] Specifically, the roughness of the adjacent surfaces of the flow guiding core 402 and the liquid storage core 401 is increased, thereby increasing the contact area between the two, thereby improving the flow guiding efficiency of the liquid and reducing the retention of the liquid between the two cores.

[0071] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A waist anti-leakage structure, comprising a liquid storage core and a flow guide core, characterized in that: The area of ​​the flow guiding core is larger than that of the liquid storage core, the liquid storage core is located on one side of the middle of the flow guiding core, and the liquid storage core and the flow guiding core are fixed as an integrated structure, so that the flow guiding core plays a role in guiding the liquid to the liquid storage core; The liquid storage core contains 55% to 75% by weight of super absorbent resin, the flow guiding core contains 75% to 85% by weight of improved fluff pulp, and both the liquid storage core and the flow guiding core are mixed with high elastic modulus fibers accounting for no less than 5% by weight.

2. A waist leak-proof structure according to claim 1, characterized in that: The method for preparing the improved fluff pulp comprises the following steps: S1, mixing 1,2,3,4-butanetetracarboxylic acid and sodium dihydrogen phosphate to prepare a crosslinking agent solution; S2, mixing the fluff pulp fiber with the crosslinking agent solution, reacting at a temperature of 200° C. to 240° C. and a pH value of 4 to 6 to obtain esterified crosslinked fluff pulp fiber; S3, subjecting the esterified and cross-linked fluff pulp fibers to composite fluffing treatment to prepare improved fluff pulp.

3. A waist leak-proof structure according to claim 1, characterized in that: The adjacent surfaces of the flow-guiding core and the liquid-storing core are both roughened.

4. A diaper comprising a skin-friendly layer, a urine absorbing article and a liquid-impermeable bottom layer stacked in sequence, characterized in that: A waist leakage prevention structure according to any one of claims 1 to 3 is arranged between the skin-friendly layer and the liquid-impermeable bottom layer, and the urine absorbent product is arranged in the interlayer area between the skin-friendly layer and the waist leakage prevention structure.

5. A diaper according to claim 4, characterized in that: The edge of the liquid-impermeable bottom layer is in contact with and fixed to the edge of the skin-friendly layer, so that urine in the diaper will not leak and contaminate clothes.

6. A diaper according to claim 4, characterized in that: The urine absorbing product consists of a secondary core, a liquid-proof middle layer and a main core located therebetween. The secondary core contains 12% to 25% by weight of super absorbent resin, and the main core contains 30% to 50% by weight of super absorbent resin.

7. A diaper according to claim 4, characterized in that: A plurality of holes and slots are arranged on the auxiliary core body, and adjacent holes and slots are arranged independently or in communication with each other, and the holes and slots are all in a structure of being wide at the top and narrow at the bottom.

8. A diaper as claimed in claim 4, characterized in that: The edge of the liquid-tight middle layer is in contact with and fixed to the edge of the secondary core body, so that urine in the urine absorbing product will not leak into the waist anti-leakage structure.

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