CN219557822U

CN219557822U - Sanitary towel

Info

Publication number: CN219557822U
Application number: CN202320349275.0U
Authority: CN
Inventors: 刘崇九; 王芳
Original assignee: Beishute Tianjin Sanitary Products Co ltd
Current assignee: Beishute Tianjin Sanitary Products Co ltd
Priority date: 2023-02-27
Filing date: 2023-02-27
Publication date: 2023-08-22
Anticipated expiration: 2033-02-27

Abstract

The utility model provides a sanitary towel which sequentially comprises a surface contact layer, a flow guide layer, an absorption core layer and a bottom coating layer from top to bottom, wherein the surface contact layer is made of non-woven fabrics, the flow guide layer is positioned between the surface contact layer and the absorption core layer, the absorption core layer is of a multi-layer composite structure and comprises a first dust-free paper layer, a first polymer layer, a fluffy non-woven fabrics layer, a second polymer layer and a second dust-free paper layer, and the first polymer layer and the second polymer layer are made of different types of polymer water-absorbing resins. The utility model can obviously improve the overall absorption speed and rewet amount of the product by selecting two most suitable different types of macromolecule water-absorbent resins for compounding, and comprehensively improve various performance technical indexes of the product.

Description

Sanitary towel

Technical Field

The utility model relates to the field of absorbent sanitary articles, in particular to a sanitary towel and a manufacturing method thereof.

Background

With the economic development and the improvement of the living standard of people, consumers have higher and higher demands for sanitary products, and sanitary towels used in different scenes are increasingly subdivided, so that products with high absorption speed, dryness, no residue on the menstrual blood surface and ventilation are pursued. For sanitary napkins, absorbency is certainly the most important property, and if menstrual blood cannot be absorbed in time, it is extremely likely to cause back leakage or side leakage, and even dirty clothes or bedsheets, causing embarrassment. In addition, the requirements of consumers on the functionality and the comfort of the sanitary towel are higher and higher, and through investigation, the attention of consumers on the air permeability is higher, so that light, thin and breathable sanitary towel products are more and more favored by consumers.

At present, the sanitary towel core body has poor liquid diffusion performance, absorbed liquid is concentrated at a small part of the core body and is not easy to diffuse to other parts, so that other parts cannot be effectively utilized, and the absorbed liquid at the part is more so that the part is moist and not dry, thereby affecting comfort. On the other hand, the multi-layer composite sanitary towel core is generally formed by wrapping fluffy non-woven fabrics of a middle supporting structure, high-molecular water-absorbent resin and an upper isolation layer and a lower isolation layer, and most of the high-molecular water-absorbent resin is adhered to the upper isolation layer and the lower isolation layer in the use process, so that the upper and lower layers are obvious in layering, and the upper layer high polymer rapidly expands to cause blocking after absorbing body fluid, so that the secondary absorption speed is greatly influenced, the surface layer dryness of the sanitary towel is reduced, and the user experience is poor. There is a need for an optimization of sanitary napkin products that addresses the above-described technical problems.

Disclosure of Invention

The utility model aims to overcome the defects and provide a novel sanitary towel which adopts a composite core structure, is ultrathin and breathable, and has the advantage of cost while improving the absorption speed and the surface dryness of the product.

The utility model adopts the following technical scheme: a sanitary napkin comprising, in order from top to bottom, a top sheet comprising a surface contact layer, a baffle layer, an absorbent core layer, and a backsheet layer.

The surface contact layer is made of non-woven fabric material, preferably hot air non-woven fabric, and is made of double-component sheath-core composite fiber, preferably PE/PET composite fiber, and the fiber fineness is 1.0D-2.5D.

The diversion layer is positioned between the surface layer and the absorption core body, preferably coarse denier high-fluffiness low-density non-woven fabric, and PE/PP or PE/PET composite fiber can be adopted, and the fiber fineness is 2.0D-6.0D.

The absorption core layer is a composite core body, adopts a multi-layer composite structure, and is provided with a first dust-free paper layer, a first polymer layer, a fluffy non-woven fabric layer, a second polymer layer and a second dust-free paper layer which are sequentially stacked from top to bottom. Wherein the first polymer layer and the second polymer layer are different types of polymer water-absorbent resins. The different types are mainly characterized by different absorption amounts and absorption speeds.

Preferably, the first polymer layer is permeable polymer water-absorbing resin, so that the menstrual blood absorption speed is high; the second polymer layer is high-absorptivity polymer water-absorbing resin, and the absorption quantity is high. Further, the microscopic surface morphology of the first polymer layer is in an irregular shape, and the saturated water absorption multiplying power is 100-200 times in 1 min; the absorption rate of the second polymer layer is high, the saturated water absorption rate of the second polymer layer is 250-350 times after 1min, and the artificial menstrual blood is absorbed by the first polymer layer more than 30% faster than the second polymer layer.

Preferably, the first polymer layer is a high-absorbent polymer water-absorbent resin; the second polymer layer is permeable polymer water-absorbing resin.

Further, the weight ratio of the first polymer layer to the second polymer layer is 0.1-7.0:1.

Further, the basis weight of the first dust-free paper layer or/and the second dust-free paper layer is 30-60 gsm.

10% -60% of high molecular water-absorbing resin, preferably 20% -40% of high molecular water-absorbing resin, is added in the middle of the absorption core layer.

Further, the outside of the absorbent core layer can be wrapped by non-woven fabrics or wet-strength paper at the same time.

Compared with the prior art, the utility model has the following beneficial effects: the materials of each layer are optimized and improved, particularly the middle absorption core layer, and the type and the adding proportion of the optimized polymer layer are determined through a large number of experiments by adopting different types of polymer water-absorbent resins as the polymer layer to be combined with the fluffy non-woven fabric layer. By selecting two most suitable different similar high molecular water-absorbing resins for compounding, the overall absorption performance of the product is improved, so that the overall absorption speed and rewet amount of the product are obviously improved, the absorption speed can be improved by 39%, and the rewet amount is improved by 30%.

Drawings

Figure 1 is a schematic structural view of an absorbent core of the present utility model.

FIG. 2 shows the surface morphology of a high-permeability type water-absorbent polymer.

In the figure, 1 a first dust-free paper layer; 2 a first polymer layer; 3 fluffy non-woven fabric layers; 4 a second polymer layer; and 5, a second dust-free paper layer.

Detailed Description

In order to make the objects, technical solutions adopted and technical effects achieved of the present utility model more apparent, the technical solutions of the present utility model will be described in further detail below with reference to the accompanying drawings and examples, and it is apparent that the described examples are only some, but not all, examples of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model provides a sanitary towel which sequentially comprises a surface contact layer, a flow guide layer, an absorption core layer and a bottom coating layer from top to bottom.

The surface contact layer is made of non-woven fabric material, preferably hot air non-woven fabric, and is made of double-component sheath-core composite fiber, preferably PE/PET composite fiber, wherein the fiber fineness is 1.0D-2.5D, and the material is fluffy and soft.

The diversion layer is positioned between the surface layer and the absorption core body, is preferably a coarse denier high-fluffiness low-density non-woven fabric, can adopt PE/PP or PE/PET composite fibers, has the fineness of 2.0D-6.0D, plays roles in guiding liquid to longitudinally diffuse, preventing reverse osmosis and temporarily storing liquid, rapidly absorbs the liquid, ensures that the liquid is easy to permeate down to the core body, is difficult to reverse osmosis after being extruded, receives continuous liquid for a plurality of times on the same position, and has good liquid receiving and distributing performance during the downward osmosis.

The absorption core layer is a composite core body, a multi-layer composite structure is adopted, the structural schematic diagram is shown in fig. 1, a first dust-free paper layer 1, a first polymer layer 2, a fluffy non-woven fabric layer 3, a second polymer layer 4 and a second dust-free paper layer 5 are sequentially laminated from top to bottom, and the absorption core layer is compounded into an integral structure through a colloid bonding or pressing mode, so that the layers of the composite core body are tightly combined, movement cannot be generated during use, and comfort and safety of a wearer during use are ensured. In this embodiment, the first and second dust-free paper layers 1 and 5 have a basis weight of 30-60 gsm, and play a role in absorption and diffusion. The dust-free paper can also be replaced by a non-woven fabric, and the non-woven fabric can be selected from one of a spun-laced non-woven fabric, a hot air non-woven fabric and a spun-bond non-woven fabric.

In the embodiment, the fluffy non-woven fabric layer 3 is combined with the macromolecule water absorbent resin on the upper layer and the lower layer to form honeycomb water locking, and the water absorbent particles are immediately and firmly locked after water absorption expansion, so that the materials in the product are effectively prevented from being broken into clusters when meeting water, and meanwhile, the liquid can be split, and the water absorbent composite is soft and comfortable and keeps dry and comfortable.

Wherein, the first polymer layer 2 and the second polymer layer 4 adopt different types of polymer water absorbent resins. The different types are mainly characterized by different absorption amounts and absorption speeds. More specifically, the first polymer layer 2 is permeable polymer water-absorbing resin with high liquid permeability, and the menstrual blood absorption speed is high; the second polymer layer 4 is a high-absorbency polymer water-absorbent resin, and has a high absorption capacity. Or the first polymer layer 2 is high-absorptivity polymer water-absorbing resin, and the second polymer layer 4 is permeable polymer water-absorbing resin. The permeable high molecular water-absorbing resin has excellent diffusion performance and menstrual blood absorption performance, high absorption speed, small long-term rewet amount and good dryness. The high-absorptivity high-molecular water-absorbing resin has high absorptivity and low short-term rewet. Both types of high molecular water-absorbing resin are existing materials and are not described in detail herein.

In one example, the first polymer layer 2 is a permeable polymer absorbent resin having high liquid permeability, and the second polymer layer 4 is a polymer absorbent resin having high absorbency. The high polymer water-absorbing resin of the first high polymer layer 2 is prepared by adopting an aqueous solution polymerization method, the microscopic surface morphology is in an irregular shape, and the saturated water absorption multiplying power is 100-200 times in 1 min; the second polymer layer 4 is prepared by adopting a reverse suspension polymerization method, the saturated water absorption multiplying power is 250-350 times in 1min, and the first polymer layer absorbs artificial menstrual blood more than 30% faster than the second polymer layer. And the second polymer layer 4 has a higher absorption capacity than the first polymer layer 2.

In another example, the first polymer layer 2 is a high-absorbent polymer water-absorbent resin, and the second polymer layer 4 is a permeable polymer water-absorbent resin having high liquid-passing properties. I.e. the first polymer layer 2 absorbs more than the second polymer layer 4, and the second polymer layer 4 absorbs more rapidly than the first polymer layer. The absorption rate and rewet of the products of examples 1 and 2 in Table 1 are also superior to those of the prior art products.

Further, the addition proportion of the macromolecule water-absorbent resin in the composite core body is 10% -60%, preferably 20% -40%, and the absorption speed and the rewet amount of the macromolecule water-absorbent resin are optimized through reasonable proportion. The weight ratio of the first polymer layer 2 to the second polymer layer 4 is 0.1 to 7.0:1, preferably 0.3 to 3.0:1.

Preferably, the outer part of the composite core body can be wrapped by non-woven fabrics or wet-strength paper at the same time, so that the polymer is prevented from scattering in the transportation and production processes, and the using effect is prevented from being influenced.

The composite core body with the improved embodiment adopts the polymer layer combination with the differentiation, can give consideration to both water retention and liquid permeability, and ensures that the absorbent core body has better dryness in different periods after absorbing liquid.

The composite core body can be used for sanitary napkins and paper diapers.

The first polymer layer 2 and the second polymer layer 4 of the product are subjected to comparison test by adopting polymer formulas with different mass percentages and the compound core sanitary towel product with the existing formula on the market at present, the test is carried out according to an absorption speed test method in GB/T8939-2018, the rewet amount is expressed by applying pressure through a 2.3kg pressing block, and the weight of test liquid rewet onto filter paper is used for testing the rewet amount, and the specific test results are shown in Table 1.

From the test data in table 1, the absorption rate and rewet amount of the inventive samples were superior to the control samples. More specifically, comparative example 1 is a prior art product, and the first polymer layer 2 and the second polymer layer 4 are made of the same polymer water absorbent resin, i.e., both polymer water absorbent resins with high absorptivity.

In one preferred example, in example 1 and example 2, compared with comparative example 1, the second polymer layer 4 was made of a permeable polymer water-absorbent resin, that is, the second polymer layer 4 was made of a polymer water-absorbent resin having an irregular micro surface morphology, and the saturated water absorption ratio for 1min was 100 to 200 times. The difference between example 1 and example 2 is the ratio of the penetrating polymer to the second polymer layer. In example 1, the mass ratio of the first polymer layer 2 to the second polymer layer 4 was 1:0.3. In example 2, the mass ratio of the first polymer layer 2 to the second polymer layer 4 was 1:1. From the data in Table 1, it can be seen that the absorption rate and dryness (rewet) of the products of example 1 and example 2 are significantly improved over those of comparative example 1. The absorption rate of example 2 was slightly faster than that of example 1.

One preferred example, for example, in examples 3 and 4, is to use a permeable type high molecular weight water absorbent resin for the first high molecular weight layer 2 (i.e., a high molecular weight water absorbent resin with an irregular shape in microscopic surface morphology, and a saturated water absorption rate of 100-200 times for 1 min), and a high absorption type high molecular weight water absorbent resin for the second high molecular weight layer 4, and a saturated water absorption rate of 250-350 times for 1min, wherein the absorption rate and dryness of the product are also significantly improved, and specific data are shown in table 1. In examples 3 and 4, the permeable polymer water absorbent resin was disposed in the first polymer layer 2, and the addition ratio of the permeable polymer in example 3 was increased to 2:1, and the mass ratio of the first polymer layer 2 to the second polymer layer 4 in example 4 was 3:1. Example 3 and example 4 are superior to comparative example 1 in both the absorption rate and rewet amount.

Through carrying out investigation on consumers, the sanitary towel of the embodiment 3 and the control sample are selected in investigation data to carry out trial investigation on consumers, 83% of consumers prefer the product with the composite core structure, and the feedback dryness of the consumers is obviously improved.

TABLE 1 absorption Rate and rewet test results

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present utility model still fall within the scope of the present utility model.

Claims

1. A sanitary napkin comprising, in order from top to bottom, a cover comprising a surface contact layer, a baffle layer, an absorbent core layer, and a backsheet layer, characterized in that: the absorbent core layer is a composite core body, and a first dust-free paper layer, a first polymer layer, a fluffy non-woven fabric layer, a second polymer layer and a second dust-free paper layer are sequentially laminated from top to bottom; the first polymer layer and the second polymer layer are polymer water absorbent resins with different absorption capacity and absorption speed.

2. A sanitary napkin as claimed in claim 1, wherein: the first polymer layer is permeable polymer water-absorbent resin, so that the menstrual blood absorption speed is high; the second polymer layer is high-absorptivity polymer water-absorbing resin, and the absorption quantity is high.

3. A sanitary napkin as claimed in claim 1, wherein: the first polymer layer is high-absorptivity polymer water-absorbing resin; the second polymer layer is permeable polymer water-absorbing resin.

4. A sanitary napkin as claimed in claim 2, wherein: when the 1min saturated water absorption rate of the first polymer layer is 100-200 times, the 1min saturated water absorption rate of the second polymer layer is 250-350 times; the first polymer layer absorbs artificial menstrual blood more than 30% faster than the second polymer layer.

5. A sanitary napkin as claimed in claim 2, wherein: the weight ratio of the first polymer layer to the second polymer layer is 0.1-7.0:1.

6. A sanitary napkin as claimed in claim 1, wherein: the basis weight of the first dust-free paper layer or/and the second dust-free paper layer is 30-60 gsm.

7. A sanitary napkin as claimed in claim 1, wherein: the surface contact layer adopts hot air non-woven fabrics or double-component sheath-core composite fibers; the double-component sheath-core composite fiber is PE/PET composite fiber, and the fiber fineness is 1.0D-2.5D.

8. A sanitary napkin as claimed in claim 1, wherein: the diversion layer adopts coarse denier high-fluffiness low-density non-woven fabrics or PE/PP or PE/PET composite fibers; the fineness of the PE/PP or PE/PET composite fiber is 2.0D-6.0D.

9. A sanitary napkin as claimed in claim 1, wherein: 10% -60% of high polymer water-absorbent resin is added in the middle of the absorption core layer.

10. A sanitary napkin as claimed in claim 1, wherein: the outer layer of the absorption core layer can be wrapped by non-woven fabrics or wet-strength paper.