CN115252287A

CN115252287A - Stereo slotted sanitary towel and its making method

Info

Publication number: CN115252287A
Application number: CN202210905985.7A
Authority: CN
Inventors: 王芳; 李广军
Original assignee: Beishute Tianjin Sanitary Products Co ltd
Current assignee: Beishute Tianjin Sanitary Products Co ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-11-01

Abstract

The invention provides a three-dimensional slotted sanitary towel, which comprises a surface layer, an absorption core layer and a bottom film layer, wherein the middle part of the sanitary towel is provided with a plurality of holes and is arranged in the middle position which is parallel to protective wings at two sides; a plurality of grooves are arranged above the opening; a rear concave strip is arranged below the opening; the both sides of back concave strip are provided with the cutting line of symmetry, set up annular concave channel around the piece of cloth body, play the effect to the further separation of liquid. The improved manufacture process enables the core body to form the structures such as the groove, the rear concave strip, the cutting line and the like after being formed.

Description

Stereo slotted sanitary towel and its making method

Technical Field

The invention relates to the field of absorbent sanitary products, in particular to a three-dimensional slotted sanitary towel and a manufacturing method thereof.

Background

With the economic development and the improvement of the living standard of people, the demands of consumers on sanitary products are higher and higher no matter sanitary napkins or paper diapers are used, the sanitary napkins used in different scenes are subdivided, and the consumers seek products which are high in absorption speed, dry and comfortable, have no residue on the surface of menstrual blood and are breathable. The absorption property is undoubtedly the most important property of the sanitary towel, if the menstrual blood can not be absorbed in time, the sanitary towel is easy to cause back leakage or side leakage, and even can stain clothes or bed sheets to cause embarrassment.

The reasons for the leakage are as follows: firstly, front leakage, no retaining wall at the front part of the sanitary towel and insufficient absorption in the middle part; secondly, the side leakage is caused, the side part is not provided with a retaining wall, the middle part is not fully absorbed, and the liquid is not conducted to the front end and the rear end in time; thirdly, the liquid leaks backwards, a retaining wall is lacked at the back part, and the liquid is not fully absorbed in the middle, or the retaining wall is not arranged at the groin, so that the liquid is not fully absorbed at the groin.

For the reasons of the leakage, the existing solutions in the market at present are as follows: (1) an absorption structure is added in the middle of the sanitary towel, and the front end and the rear end are dredged simultaneously; (2) increase the absorption and retaining wall of the femoral sulcus; (3) a retaining wall is arranged on the side part; (4) retaining walls are arranged at the front part, the side part and the rear part. According to the scheme, the retaining wall is added, when the retaining wall is used, the function of the retaining wall is weakened due to physical pressure, and when tidal surge attacks, the side leakage or back leakage is easily caused due to large menstrual blood volume, so that the retaining wall can be completely failed. From the perspective of the speed of absorption body liquid, the rapid absorption of menstrual blood is influenced, the absorption of menstrual blood is too slow, the menstrual blood is not easy to infiltrate downwards, and the probability of increasing leakage of menstrual blood is increased; thereby affecting the use of the absorbent hygiene article. It is necessary to solve these problems.

Disclosure of Invention

The invention aims to overcome the defects and provide the three-dimensional slotted sanitary towel and the manufacturing method thereof, which have the advantages of high absorption speed and good diffusion, can effectively solve the technical problem of leakage and achieve the aim of comprehensive leakage prevention.

The invention adopts the following technical scheme: a three-dimensional slotted sanitary towel is a sanitary towel with wings and is provided with a surface layer, an absorption core layer and a bottom film layer, wherein annular concave channels are arranged around a sanitary towel body, and holes, grooves, cutting lines and back concave strips are distributed in an area surrounded by the annular concave channels. The openings are multiple and are arranged in the middle of the sanitary towel, particularly in the middle position which is flush with the protective wings at the two sides; the upper portion of the opening is provided with a plurality of grooves, a rear concave strip is arranged at the central line position below the opening, cutting lines are arranged on two sides of the rear concave strip, and the opening, the grooves, the rear concave strip and the cutting lines are distributed in an area defined by the annular concave channel.

Preferably, the number of the openings is 5, and the openings comprise 1 central opening and 4 corner openings, the central opening falls on the central line of the sanitary towel, and the corner openings are uniformly distributed on the outer 4 corners of the central opening and form 45 degrees with the connecting line of the central opening. Further, the vertical distance between the corner opening and the central opening 31 is 1-2 cm.

Preferably, the grooves are distributed in a radial mode and do not intersect with each other. Furthermore, the grooves are three, namely a middle groove and two side grooves, the middle groove is arranged on the central line of the sanitary towel, and the two side grooves are obliquely and symmetrically distributed on two sides of the middle groove; the included angle between the extension lines of the grooves on the two sides and the central line of the sanitary towel is 20-30 degrees.

Preferably, the length of the middle groove is 2-5 cm; the length of the grooves on the two sides is 1-3 cm.

Furthermore, the intersection point of the extension lines of the two grooves on the two sides is the starting point of the rear concave strip.

Preferably, the cutting lines are two groups of symmetrical arc grooves with upward openings, and the arc grooves extend upwards from the upper part and the middle part of the rear concave strip respectively. Furthermore, the cutting lines comprise a first cutting line and a second cutting line, and the vertex of the first cutting line or the second cutting line is arranged at the central line below the opening and is vertically spaced from one end, close to the opening, of the rear concave strip by 2-5 cm; the included angle between the connecting line of the tail end of the first cutting line or the second cutting line and the respective vertex and the central line of the sanitary towel is 20-30 degrees.

Preferably, the length of the back concave strip is 8-15 cm.

Preferably, the apertures may be core apertures or perforations extending through the topsheet to the absorbent core.

Preferably, the grooves are formed by embossing or grooving.

Preferably, the sanitary napkin body is provided with diamond-shaped embossings, the diamond-shaped embossings are formed by online pressing through a production line or the surface material is the diamond-shaped embossings.

Preferably, the two side wings of the sanitary towel are made of water-repellent non-woven fabrics and are adhered to the bottom film.

A method for manufacturing a three-dimensional slotted sanitary towel comprises the steps that a die wheel is used for forming an absorption core body, the surface of the die wheel is provided with convex structures, the convex structures are convex strips with different shapes, and the convex strips are fixedly connected or detachably connected with the die wheel, for example, in a bonding, binding or welding mode. The convex structure can be carved into a preset shape on the die wheel according to the shape of the slot, or convex strips with different shapes are assembled on the die wheel through a special process, and the convex structure can be assembled and disassembled at will.

In a preferred embodiment, the die wheel protrusion structure comprises a central first protrusion and a central second protrusion, both of which are disposed on the central axis of the die wheel.

Furthermore, the length of the central first bulge is 2-5 cm, and inclined third bulges and fourth bulges are symmetrically distributed on two sides and do not intersect with the central first bulge; the included angle between the extension lines of the third bulge and the fourth bulge and the central axis of the die wheel is 20-30 degrees, and the intersection of the extension lines is the starting point of the central second bulge; the length of the third bulge and the fourth bulge is 1-3 cm. The initial position of the central first bulge on the die wheel is the position of the central line of the corresponding protective wing at the narrowest part of the die wheel, and the vertical distance between the central first bulge and the central line of the protective wing is 1-3 cm.

Furthermore, the length of the second protrusion at the center is 8-15 cm, and an upper arc line group and a lower arc line group are symmetrically distributed on two sides of the intersection point of the extension lines of the third protrusion and the fourth protrusion as a starting point. The upper arc group and the lower arc group are both in a branch shape with an upward opening, and the branch shape can be a straight line or a curve. The distance between the top point of the upper arc line group and the starting point of the central second bulge is 1-3 cm, and the tail ends of the branches of the upper arc line group and the starting point of the central second bulge are positioned on the same horizontal line; the included angle between the connecting line of the top of the upper arc line group and the tail end of the branch and the central axis of the die wheel is 20-30 degrees. The vertex of the lower arc line group is 2-5 cm away from the vertex of the upper arc line group, the tail end of the branch of the lower arc line group is 1-2 cm away from the central axis of the die wheel, and the included angle between the connecting line of the vertex of the lower arc line group and the tail end of the branch of the lower arc line group and the central axis of the die wheel is 20-30 degrees.

Compared with the prior art, the invention has the following beneficial effects:

firstly, the invention combines the stereo slot and the penetration hole to arrange different absorption functional areas along the transverse direction and the vertical direction of the towel body, and the invention can realize 360-dimensional leakage prevention, thereby ensuring that the menstrual blood is absorbed quickly, scattered and locked. Transverse absorption: the middle of the towel body is quickly infiltrated into the diversion hole and instantly absorbed; the front and back drainage grooves are matched with the diamond-shaped surface embossing, and liquid which is not completely absorbed is shunted to other positions of the towel body, so that the towel can resist the invasion of tidal surge for many times and is durable in leakage prevention. Longitudinal absorption: instant surface layer absorption, diversion diffusion and water locking layer absorption, and omnibearing instant water locking.

Secondly, the preparation method has simple production process and low cost, and is convenient for large-scale production and popularization; the prepared three-dimensional slotted sanitary towel can introduce a large amount of body fluid, can be quickly absorbed, can effectively prevent reverse osmosis, is convenient to quickly absorb through the arranged open pores, the grooves and the annular concave channels, and improves the use comfort. In the prior art, the die wheel is concave in structure, and the absorption core body is convex after being formed. Different from the prior art, the die wheel is arranged to be of the convex structure, so that the designed groove structure can be formed after the core body is formed.

Drawings

Fig. 1 is a schematic top plan view of the product of the present invention.

FIG. 2 is a schematic diagram of the structure of the grooves and openings in the product of the present invention.

Fig. 3 is a schematic plan view of the raised structure of the die wheel of the present invention.

Fig. 4 is a manufacturing flow diagram of an embodiment of the invention.

In the figure, 1, an annular concave channel; 2. a groove; 21. a middle groove; 22. grooves on two sides; 3. opening a hole; 31. opening a hole in the center; 32. opening holes at the corners; 4. cutting lines; 41. a first cut line; 42. second cutting lines; 5. a rear concave strip; 6. embossing in a diamond shape; 100. a die wheel; 101. a central first projection; 102. a central second projection; 103. a third protrusion; 104. a fourth protrusion; 105. an upper arc line group; 106. and a lower arc line group.

Detailed Description

In order to make the purpose, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the present invention are described in further detail below with reference to the accompanying drawings and embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. 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 invention provides a three-dimensional slotted sanitary towel, which is shown in figure 1 in a schematic structural view. The sanitary napkin with wings is provided with a surface layer, an absorption core layer and a bottom film layer (not shown in the figure in a distinguishing way), wherein the absorption core layer can be of a wood pulp structure or a composite core body structure. The wood pulp structure is that wood pulp is crushed into fluff pulp on a production line; the composite core body is made of prefabricated water-absorbing paper, and can be made into three layers or five layers by adopting a gluing or heat-sealing mode, or can be directly stacked and adhered with the surface layer and the bottom film. The composite core may have a variety of configurations, such as: wet strength paper, polymer, wet strength paper and glue; lining paper, polymer, dust-free paper and wood pulp; the dust-free paper, the SAP, the fluffy non-woven fabric, the SAP, the glue and the dust-free paper.

The periphery of the sanitary towel body is provided with the annular concave channel 1 which plays a role in further blocking liquid. The area enclosed by the annular concave channel 1 is distributed with an opening 3, a groove 2, a cutting grain 4, a back concave strip 5 and an embossing 6. The annular recessed channel 1 is formed by a press-fitting process. The shape of the annular groove 1 can be a continuous closed line (not shown in the figure) or a broken curve segment, as shown in fig. 1, and can be designed into different patterns for aesthetic reasons.

In a preferred embodiment, the body of the sanitary napkin is provided with a plurality of apertures 3, which are symmetrically distributed. As shown in fig. 1 and fig. 2, in the present embodiment, 5 openings 3 are provided, wherein 1 is a central opening 31, and the remaining 4 are corner openings 32. The central opening 31 is positioned on the central line of the sanitary towel and is positioned in the middle of the two side protective wings; the 4 corner openings 32 are uniformly distributed on the outer 4 corners of the central opening 31, and the vertical distance between the openings and the central opening 31 is 1-2 cm; the line connecting the angular opening 32 and the central opening 31 makes an angle of 45 ° with the centre line of the sanitary towel. The open pores 3 are needle punched holes, can be only open on the absorption core layer, and can also penetrate through the absorption core layer from the surface layer, and the open pores can enable menstrual blood to rapidly infiltrate downwards and conduct to the absorption core layer, so that leakage caused by instant damp surge which can not be absorbed in time is avoided.

In a preferred embodiment, a plurality of grooves 2 are distributed above the opening 3, the grooves 2 are distributed on the outer side of the opening 3 in a radial mode, and the unabsorbed liquid can be distributed to other positions of the towel body by embossing or grooving. As shown in fig. 1 and fig. 2, the present embodiment has three grooves 2, and the middle groove 21 is arranged on the central line of the sanitary napkin, and the length is 2-5 cm; the grooves 22 on the two sides are obliquely arranged and symmetrically distributed on the two sides of the middle groove 21, do not intersect with the middle groove 21, and have the length of 1-3 cm, and the included angle between the extension lines of the grooves 22 on the two sides and the central line of the sanitary towel is 20-30 degrees.

In a preferred embodiment, the rear concave strip 5 is arranged at the center line below the opening 3 and has a length of 8-15 cm. The two sides of the rear concave strip 5 are provided with symmetrical cutting lines 4, and the cutting lines 4 are two groups of symmetrical arc grooves with upward openings, namely a first cutting line 41 and a second cutting line 42 which extend upwards from the upper part and the middle part of the rear concave strip 5 respectively. The distance between the top points of the first cutting veins 41 and the second cutting veins 42 and one end of the rear concave strip 5 close to the open pore 3 is 2-5 cm. The included angle between the connecting line of the arc-shaped tail end of the first cutting grain or the second cutting grain and the respective vertex and the central line of the sanitary towel is 20-30 degrees. The arc-shaped end of the first cut grain extends to the lower part of the lower corner opening 32, and the vertical distance between the arc-shaped end of the first cut grain and the lower corner opening 32 is 0.3-1 cm. The starting point of the rear concave strip 5 can be the intersection point of the extension lines of the two side grooves 22.

In a preferred embodiment, the sanitary towel body is provided with the diamond-shaped embossing 6, and the diamond-shaped embossing 6 can play a good role in diffusion and is generally formed by online pressing in a production line; the facing layer and the absorbent core layer can also be made by selecting materials with diamond-shaped surfaces.

The two side protective wings of the sanitary towel are made of water-repellent materials, are adhered to the bottom film and are generally made of water-repellent non-woven fabrics, and can further prevent liquid from leaking laterally.

By adopting the technical scheme, the invention has the beneficial effects that: the product of the invention is based on the prior sanitary towel, the structure innovation of the product is adopted, the holes, the grooves, the embossing and the like are organically combined, the structure of the human body is more close to the skin, and the aim of comprehensive leakage prevention of the product is achieved by arranging multiple grooves and flow guide holes. Firstly, the plurality of openings arranged in the middle of the sanitary towel main body at the position flush with the protective wings can ensure that menstrual blood quickly infiltrates and conducts to the absorption core layer when a consumer uses the sanitary towel, so as to avoid leakage caused by instant surge which can not be absorbed in time; secondly, many recesses or cut lines are distributed to the position about the trompil, can shunt the liquid that does not absorb to other positions of towel body. And thirdly, annular concave channels are arranged around the towel body to further separate liquid. Meanwhile, the sanitary towel body can be provided with diamond-shaped embossing which can play a good role in diffusion, and the diamond-shaped embossing can be realized by selecting diamond-shaped surface materials and can also be formed by online pressing of a production line. The two sides of the product protective wing are made of water-repellent materials, generally water-repellent non-woven fabrics, so that the side leakage of liquid is further prevented.

A method for manufacturing a three-dimensional slotted sanitary towel comprises the steps that a die wheel is used for forming an absorption core body, the surface of the die wheel is provided with convex structures, the convex structures are convex strips with different shapes, and the convex strips are fixedly connected or detachably connected with the die wheel, for example, in a bonding, binding or welding mode. The protruding structure can be carved into a preset shape on the die wheel according to the shape of the slot, or convex strips with different shapes are assembled on the die wheel through a special process, and the assembling and disassembling can be carried out at will.

In a preferred embodiment, as shown in fig. 3, the surface of the die wheel 100 is provided with a convex structure comprising a central first protrusion 101 and a central second protrusion 102, and the central first protrusion 101 and the central second protrusion 102 are both arranged on the central axis of the die wheel 100.

Furthermore, the central first bulge 101 is 2-5 cm long, and inclined third bulges 103 and fourth bulges 104 are symmetrically distributed on two sides and do not intersect with the central first bulge 101; the included angle between the extension lines of the third protrusion 103 and the fourth protrusion 104 and the central axis of the die wheel 100 is 20-30 degrees, and the intersection of the extension lines is the starting point of the central second protrusion 102; the length of the third protrusion 103 and the fourth protrusion 104 is 1-3 cm. The starting position of the central first protrusion 101 on the die wheel 100 is the position of the narrowest part of the die wheel 100 corresponding to the center line of the wing, and the vertical distance between the central first protrusion 101 and the center line of the wing is 2 cm.

Furthermore, the length of the central second protrusion 102 is 8-15 cm, and the intersection point of the extension lines of the third protrusion 103 and the fourth protrusion 104 is used as a starting point, and the upper arc line group 105 and the lower arc line group 106 are symmetrically distributed on two sides of the central second protrusion. The upper arc group 105 and the lower arc group 106 are both of a branched shape with an upward opening, and the branched shape may be a straight line or a curved line. The vertex of the upper arc line group 105 is 1-3 cm away from the starting point of the central second protrusion 102, and the branch tail ends of the upper arc line group 105 and the starting point of the central second protrusion 102 are on the same horizontal line; the included angle between the connecting line of the top point of the upper arc line group 105 and the tail end of the branch thereof and the central axis of the die wheel 100 is 20-30 degrees. The vertex of the lower arc line group 106 is 2-5 cm away from the vertex of the upper arc line group 105, the tail end of the branch is 1-2 cm away from the central axis of the die wheel 100, and the included angle between the vertex of the lower arc line group 106 and the connecting line of the tail end of the branch and the central axis of the die wheel 100 is 20-30 degrees.

The raised structures of the die wheel correspond to the structures of the three-dimensional slotted sanitary napkins respectively, as shown in table 1.

TABLE 1 structural comparison of die wheel raised structure with three-dimensional grooved sanitary napkin

Specifically, the manufacturing method of the three-dimensional slotted sanitary towel comprises the following steps:

(1) The blowing is smashed, specifically smashes into the fluff pulp with wood pulp, the distribution of fluff pulp absorbs the fluff pulp on the surface of die wheel through high pressure positive blower's induced drafting, shifts to by the die wheel strip drawing of patterns again and carries on the toilet paper behind the transfer wheel. The size of fan has decided the fashioned effect of core, and it is adjustable to adsorb wind pressure size.

(2) The core body molding manufacturing comprises a die wheel protrusion setting process, can be carved into a preset shape on the die wheel according to the shape of a slot, or convex strips with different shapes are assembled on the die wheel through a special process, and can be assembled and disassembled at will.

(3) After the core body is formed, the method also comprises the following steps: core wrapping → compaction → embossing → diversion → peripheral sealing → shaping → turning → folding → conveying → finished product. And (3) the fluff pulp is formed, demoulded and transferred onto toilet paper, conveyed to a cotton core coating and adsorbing air hopper, folded through a left paper folding plate and a right paper folding plate, conveyed to a cotton core compacting roller, and finally cut into sheet-shaped products through a cutting roller.

The absorption speed of the sample is obviously improved through tests, the absorption speed test method is the same as GB/T8939-2018, and the specific test method is as follows:

(1) Placing the absorption rate tester in a horizontal position, pouring enough standard synthetic test solution into the liquid storage tank, starting the tester, clicking the rinse button, and rinsing twice. The filling volume of the automatic filling device is calibrated according to the specification of the instrument.

(2) The arc sample seat that will absorb on the speed tester is got and is transferred at horizontal desktop, get a slice of sample, tear the bottom and leave type paper, paste gently in the arc test area that the arc experiment was done, the front end of sample is in the left (L) side of arc sample seat when pasting, the rear end is in the right (R) side of arc sample seat, and flap central line (perpendicular to piece of cloth body) correspond the line with the liquid outlet and align on the base, paste the both sides in arc sample seat with the flap, then the fixed position of absorption speed tester is put to the arc sample seat that will paste the sample.

(3) And entering a test interface of the absorption speed tester, and setting the thickness of the sample to ensure that the standard test module can freely fall on the surface of the sample. And (3) click testing, adding (5.0 +/-1.0) mL standard synthetic test solution into the standard testing module by the automatic solution adding device, and automatically starting timing by the timer until the liquid level at the lowest point of the absorption zone disappears and automatically stopping timing.

The product of the present invention and the sanitary napkin product purchased in the market are tested and compared by the test method, and the specific absorption rate test result is shown in table 2:

TABLE 2 absorption Rate test results

Note: in Table 2, the control sample is a commercially available conventional sanitary napkin product.

As can be seen from Table 2, the absorption rates of the samples of the present invention are superior to the control samples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.

Claims

1. The utility model provides a three-dimensional fluting sanitary towel, for taking flap sanitary towel, is equipped with surface course, absorption sandwich layer and basement membrane layer, its characterized in that: an annular concave channel is arranged around the sanitary towel body; the middle part of the sanitary towel is provided with a plurality of openings which are arranged in the middle positions which are parallel and level with the protective wings at the two sides; the upper portion of the opening is provided with a plurality of grooves, a rear concave strip is arranged at the central line position below the opening, cutting lines are arranged on two sides of the rear concave strip, and the opening, the grooves, the rear concave strip and the cutting lines are distributed in an area defined by the annular concave channel.

2. The tridimensional grooved sanitary napkin according to claim 1, characterized in that: the trompil has 5, including 1 central trompil and 4 angle trompils, the central trompil falls on the central line of sanitary towel, angle trompil equipartition sets up on 4 angles in the outside of central trompil, its with the connecting line of central trompil and the central line contained angle 45 of sanitary towel.

3. The tridimensional grooved sanitary napkin according to claim 2, characterized in that: the vertical distance between the corner opening and the central opening 31 is 1-2 cm.

4. The tridimensional grooved sanitary napkin according to claim 1, characterized in that: the grooves are distributed in a radial mode and are not intersected with each other.

5. The tridimensional grooved sanitary napkin according to claim 4, characterized in that: the number of the grooves is three, namely a middle groove and two side grooves; the middle groove is arranged on the central line of the sanitary towel, and the grooves on the two sides are obliquely and symmetrically distributed on the two sides of the middle groove; the included angle between the extension lines of the grooves on the two sides and the central line of the sanitary towel is 20-30 degrees.

6. The tridimensional grooved sanitary napkin according to claim 5, characterized in that: the length of the middle groove is 2-5 cm; the length of the grooves on the two sides is 1-3 cm.

7. The tridimensional grooved sanitary napkin according to claim 5, characterized in that: the intersection point of the extension lines of the two grooves on the two sides is the starting point of the rear concave strip.

8. The tridimensional grooved sanitary napkin according to claim 1, wherein: the cutting lines are arc grooves with upward openings and respectively extend upwards from the upper part and the middle part of the rear concave strip.

9. The tridimensional grooved sanitary napkin according to claim 8, wherein: the cutting lines comprise a first cutting line and a second cutting line, and the vertex of the first cutting line or the second cutting line is arranged at the central line below the opening and is vertically spaced from one end, close to the opening, of the rear concave strip by 2-5 cm; the included angle between the connecting line of the tail end of the first cutting line or the second cutting line and the respective vertex and the central line of the sanitary towel is 20-30 degrees.

10. The tridimensional grooved sanitary napkin according to claim 1, wherein: the length of the back concave strip is 8-15 cm.

11. The tridimensional grooved sanitary napkin according to claim 1, wherein: the open pores are needle punched holes which penetrate from the surface layer to the absorption core layer or only penetrate through the absorption core layer.

12. The tridimensional grooved sanitary napkin according to claim 1, wherein: the grooves are formed by embossing or grooving.

13. The tridimensional grooved sanitary napkin according to claim 1, wherein: the sanitary towel is characterized in that the towel body is provided with diamond-shaped embossing, the diamond-shaped embossing is formed by online pressing of a production line or the surface material is diamond-shaped embossing.

14. The method of manufacturing a tridimensional grooved sanitary napkin according to any one of claims 1 to 13, comprising die-wheel forming an absorbent core, characterized in that: the die wheel surface is equipped with protruding structure, protruding structure is the sand grip of different shapes, sand grip and die wheel fixed connection or detachable connection.

15. The manufacturing method according to claim 14, characterized in that: the convex structure comprises a central first bulge and a central second bulge, and the central first bulge and the central second bulge are both arranged on the central axis of the die wheel; inclined third bulges and fourth bulges are symmetrically distributed on two sides of the central first bulge, and do not intersect with the central first bulge; arc line groups are symmetrically distributed on two sides of the central second bulge.

16. The manufacturing method according to claim 15, characterized in that: the central first bulge is 2-5 cm long, the starting position of the central first bulge is the position of the central line of the corresponding protective wing at the narrowest part of the die wheel, and the vertical distance between the central line of the protective wing and the central line of the protective wing is 1-3 cm; the length of the central second bulge is 8-15 cm, and the intersection point of the extension lines of the third bulge and the fourth bulge is taken as a starting point.

17. The manufacturing method according to claim 15, characterized in that: the included angle between the extension lines of the third bulge and the fourth bulge and the central axis of the die wheel is 20-30 degrees, and the intersection of the extension lines is the starting point of the central second bulge; the length of the third bulge or the fourth bulge is 1-3 cm.

18. The manufacturing method according to claim 15, characterized in that: the arc line group is in a branch shape with an upward opening, and the branch shape is a straight line or a curve.

19. The manufacturing method according to claim 18, characterized in that: the arc line group comprises an upper arc line group and a lower arc line group; the distance between the vertex of the upper arc line group and the starting point of the central second bulge is 1-3 cm, and the tail ends of the branches of the upper arc line group and the starting point of the central second bulge are positioned on the same horizontal line; the included angle between the connecting line of the top of the upper arc line group and the tail end of the branch and the central axis of the die wheel is 20-30 degrees.

20. The manufacturing method according to claim 18, characterized in that: the vertex of the lower arc line group is 2-5 cm away from the vertex of the upper arc line group, the branch tail end of the lower arc line group is 1-2 cm away from the central axis of the die wheel, and the included angle between the vertex of the lower arc line group and the connecting line of the branch tail end of the lower arc line group and the central axis of the die wheel is 20-30 degrees.