A preparation method of briefs-type sanitary napkin

Abstract

The present invention relates to the field of sanitary products and provides a method for preparing a briefs-type sanitary napkin, which solves the defects of the prior art briefs-type sanitary napkins that they are relatively airtight and have a foreign body sensation when lying on the side. The method comprises the following preparation steps: (1) preparing an absorbent body; (2) preparing a left waist layer and a right waist layer; (3) folding the left and right pieces inwards on both sides to obtain a left and right piece with a waist reinforcement structure; (4) fixing the right ends of the two left pieces and the left ends of the two right pieces prepared in step (2) on the longitudinal sides of the absorbent body respectively; (5) cutting leg openings in the left waist layer and the right waist layer; (6) turning the left and right pieces 180 degrees along a left pre-folding line and a right pre-folding line respectively; (7) sealing and connecting the upper and lower sides of the left piece to the left end of the absorbent body; (8) cutting the product along the edge of the connection and sealing position to obtain a single-piece briefs-type sanitary napkin; and (9) folding and packaging.

Description

[0001] This application is a divisional application for patent application number: 2022109609471, application date: 2022.08.11, and patent name: A briefs-type sanitary napkin and its preparation method. Technical Field

[0002] The present invention relates to the field of sanitary products, in particular to a method for preparing a briefs-type sanitary napkin. Background Art

[0003] Existing menstrual panty-style sanitary napkins typically consist of an absorbent layer and an outer garment layer, each of which is a separate unit. The typical process involves separately molding the outer garment layer and the absorbent layer before laminating it to the outer garment layer. These panty-style sanitary napkins are relatively large, with a large waist area and extensive elastic material distribution. This increases material costs and reduces breathability around the waist. Furthermore, the production line for these panty-style sanitary napkins is lengthy, requiring bulky equipment and resulting in high costs.

[0004] The front and back panels of existing pant-type sanitary napkins have the same width. When the front and back panels are sealed together and worn, the sealing line is located slightly to the back of the left and right ends of the human body. When a person moves, the front panel is pulled to the back, which restricts movement, commonly known as "leg jamming". The back panel lacks the pulling force to wrap forward. If the pulling force of the back panel of the pant-type sanitary napkin is extended to the front of the human body, the wrapping effect will be better.

[0005] When the human body is moving (walking, squatting, lifting legs, etc.), the legs move forward and upward, which basically generates a forward and upward pulling force on the pants. Therefore, in order to adapt to ergonomics, the design of underwear and menstrual briefs should follow the principle of "the front piece should be as trim as possible so as not to get stuck in the legs, and the back piece should be able to cover as much as possible and have elasticity". The front piece should be designed to cover the triangular area but not exceed the leg-lifting line of the triangular area so as not to affect daily movements such as lifting legs and walking. The back piece should be able to wrap the hips as much as possible to the buttocks smile line to reduce the displacement of the absorber and the problem of side leakage and back leakage.

[0006] Chinese Patent No. 201921966686.4 discloses a pair of sanitary pants for women during menstruation, comprising a pants body, which includes a front body-fitting portion, a back body-fitting portion, and a crotch portion. The front body-fitting portion is provided with a self-heating sheet directly opposite the uterus, and the crotch portion is provided with a physiotherapy adsorption structure. The physiotherapy adsorption structure comprises a surface permeation layer, a mugwort soft foaming layer, a water-absorbing layer, and a bottom breathable layer stacked and tightly connected from the inside to the outside. The mugwort soft foaming layer is a spunlace non-woven fabric with mugwort extract added. The sanitary pants have the functions of warming the uterus and providing menstrual care. When in use, put on the sanitary pants, tear open the self-heating sheet, and the uterus can be automatically heated to keep warm. On the other hand, the adsorption structure can quickly absorb liquid, keeping the body clean, fresh and breathable. At the same time, the mugwort gas emitted by the mugwort soft foaming layer sterilizes and cleans the lower body, playing a nursing role. Moreover, the sanitary pants are disposable, easy to use, and fully functional, suitable for women with dysmenorrhea or cold constitution to use during menstruation. However, the front and back body-fitting parts are relatively wide and long, which makes them hot and stuffy when worn. In addition, the welding parts on the left and right sides of the front and back body-fitting parts of the sanitary pants are located on both sides, which can easily cause a foreign body sensation in the welding parts when the user lies on his side. Summary of the Invention

[0007] Therefore, in order to solve the above problems, the present invention provides a method for preparing a briefs-type sanitary napkin to solve the defects of the prior art briefs-type sanitary napkins that are relatively airtight and have a foreign body sensation when lying on the side.

[0008] To achieve the above-mentioned object, the present invention adopts the following technical solution: a briefs-type sanitary napkin comprising an absorbent body, a left waist layer, and a right waist layer, wherein the absorbent body is defined as having a longitudinal direction along the length direction and a transverse direction along the width direction, the absorbent body comprising a liquid-permeable surface layer, an absorbent core, and a liquid-impermeable bottom layer stacked in sequence from top to bottom, the longitudinal dimension of the absorbent core being shorter than the longitudinal dimensions of the liquid-permeable surface layer and the liquid-impermeable bottom layer, and the left waist layer and the right waist layer each comprising a waist outer layer, an elastic material layer, and a waist inner layer stacked in sequence from outside to inside;

[0009] The left waist layer and the absorbent body have a left front connecting portion and a left rear connecting portion, and the right waist layer and the absorbent body have a right front connecting portion and a right rear connecting portion, wherein the angles formed by the left front connecting portion and the right front connecting portion with the longitudinal center line of the absorbent body are both front sealing angles, and the angles formed by the left rear connecting portion and the right rear connecting portion with the longitudinal center line of the absorbent body are both rear sealing angles, and the front sealing angle and the rear sealing angle are 30-60°;

[0010] The left waist layer and the right waist layer are provided with leg openings that are asymmetrical in left and right sections and front and back sections;

[0011] The product is defined as having a front piece and a back piece with the narrowest horizontal line of the crotch as the dividing line, and the longitudinal length of the back piece is more than 10% longer than that of the front piece; the wrapping area of ​​the back piece is more than 20% larger than the wrapping area of ​​the front piece; the left waist layer and the right waist layer are provided with a leg elastic material layer around the leg opening circle.

[0012] Furthermore: the leg opening ring includes a flat end on the upper side, a sharp end on the lower side, a first connecting end connected to the left end of the sharp end and the flat end, and a second connecting end connected to the right end of the sharp end and the flat end. The cross-section of the leg opening ring from the flat end to the sharp end first changes from small to large and then from large to small until it reaches zero.

[0013] Furthermore: the leg elastic material layer is distributed around the first connecting end or around the first connecting end and the second connecting end.

[0014] Furthermore: the front sealing angle and the rear sealing angle are 30-60°.

[0015] Further: the left front connecting portion is an area formed by connecting the front side of the left waist layer and the left front side of the absorbent body through ultrasonic waves, gluing or hot pressing, the left rear connecting portion is an area formed by connecting the rear side of the left waist layer and the left rear side of the absorbent body through ultrasonic waves, gluing or hot pressing, the right front connecting portion is an area formed by connecting the front side of the right waist layer and the right front side of the absorbent body through ultrasonic waves, gluing or hot pressing, and the right rear connecting portion is an area formed by connecting the rear side of the right waist layer and the right rear side of the absorbent body through ultrasonic waves, gluing or hot pressing.

[0016] Further: the left waist layer has a left piece and a left second piece connected in sequence along the transverse direction, the elastic material layer of the left piece is elastic spandex yarn, and the elastic material layer of the left second piece is elastic non-woven fabric or elastic film, the right waist layer has a right piece and a right second piece connected in sequence along the transverse direction, the elastic material layer of the right piece is elastic spandex yarn, and the elastic material layer of the right second piece is elastic non-woven fabric or elastic film, and the other side of the left two pieces and the other side of the right two pieces are respectively fixedly connected to the absorbent body.

[0017] Furthermore: a central convex absorption core is provided in the middle of the absorbent body.

[0018] Furthermore: the two left sheets and the two right sheets are fixedly connected to the absorbent body by ultrasound or gluing.

[0019] Furthermore: the thickness of the left piece and the right piece are both thicker than the thickness of the two left pieces and the two right pieces.

[0020] Furthermore, the widths of the two left pieces and the two right pieces at the back of the waistline are greater than the widths at the front.

[0021] Furthermore: the rear side width is more than 20% wider than the front side width.

[0022] Furthermore: when the pant-type sanitary napkin is torn open along the left front connection part, the left rear connection part, the right front connection part, and the right rear connection part and unfolded in sequence, the product can be divided into one left piece, two left pieces, the absorbent body, one right piece, and two right pieces. There are no other connections between the pieces except the side-sealed connection parts, so that when the product is worn, there are no connecting protrusions between the non-woven fabrics, and the overall product is flat and free of foreign body feeling.

[0023] Furthermore: the left front connecting part and the right front connecting part are distributed on the front side of the human body and are 5-50 mm away from the front end convex point of the hip bone.

[0024] A method for preparing a briefs-type sanitary napkin comprises the following steps:

[0025] (1) Preparation of absorbent body: a. Mixing fluff pulp, high molecular weight water-absorbent resin, and long fibers and feeding them into a mold wheel for forming; b. Attaching a wrapping layer to obtain an absorbent core layer; c. Online compounding of a liquid-permeable surface layer and a liquid-impermeable bottom layer to obtain a continuously transporting absorbent body;

[0026] (2) preparing a left waist layer and a right waist layer: the left waist layer comprises a left sheet and two left sheets connected in sequence along the transverse direction, and the right waist layer comprises a right sheet and two right sheets connected in sequence along the transverse direction;

[0027] The preparation process of the left first sheet and the left second sheet is as follows: a first non-woven fabric, a first elastic material layer, and a second non-woven fabric are sequentially composited online to obtain a first composite article having a three-layer structure, wherein the first composite article is divided into a first left region and a second left region that are integrally connected, a dividing line between the first left region and the second left region is defined as a left pre-folding line, the first left region portion of the first composite article is defined as the left first sheet, and the second left region of the first composite article is defined as the left second sheet;

[0028] The preparation process of the right first sheet and the right second sheet is as follows: the third non-woven fabric, the second elastic material layer and the fourth non-woven fabric are sequentially transferred and compounded online to obtain a second composite object with a three-layer structure, the second composite object is divided into a right first region and a right second region that are integrally connected, a dividing line between the right first region and the right second region is defined as a right pre-folding line, the right first region portion of the second composite object is defined as the right first sheet, and the right second region portion of the second composite object is defined as the right second sheet;

[0029] (3) Folding the left and right pieces inwards on both sides respectively to obtain the left and right pieces with waist reinforcement structures;

[0030] (4) Fix the right ends of the two left sheets and the left ends of the two right sheets prepared in step (2) along one longitudinal side to the two longitudinal sides of the absorbent body respectively;

[0031] (5) Cut out leg openings from the left and right waist layers;

[0032] (6) Turn the left piece and the right piece 180° along the left pre-folding line and the right pre-folding line respectively;

[0033] (7) The upper and lower sides of the left sheet are sealed and connected to the left end of the absorbent body, and the upper and lower sides of the right sheet are sealed and connected to the right end of the absorbent body. After sealing, a left front connecting part, a left rear connecting part, a right front connecting part, and a right rear connecting part are formed. The angles formed by the left front connecting part and the right front connecting part with the longitudinal center line of the absorbent body are defined as front sealing angles, and the angles formed by the left rear connecting part and the right rear connecting part with the longitudinal center line of the absorbent body are defined as rear sealing angles. The front sealing angle and rear sealing angle are defined as 30-60°.

[0034] (8) Cutting the product along the edge of the connecting seal position to obtain a single piece of briefs-type sanitary napkin;

[0035] (9) Folding and packaging.

[0036] Furthermore, steps (7) and (8) can also be achieved in one step by using a sealing and cutting integrated knife roller.

[0037] Further: the first elastic material layer includes a waist elastic material layer and a leg elastic material layer arranged along the leg opening circle, the second elastic material layer includes a waist elastic material layer and a leg elastic material layer arranged along the leg opening circle, the first elastic material layer distributed in the left area and the right area includes a waist elastic material layer and a leg elastic material layer, the first elastic material layer distributed in the left second area is an elastic non-woven fabric or an elastic film, the second elastic material layer in the right second area is an elastic non-woven fabric or an elastic film, the waist elastic material layer is elastic spandex yarn, and the leg elastic material layer is elastic spandex yarn or elastic non-woven fabric or an elastic film.

[0038] Furthermore: the fixing method in step (4) is ultrasonic bonding or gluing bonding.

[0039] By adopting the above technical solution, the beneficial effects of the present invention are:

[0040] 1. The briefs-type diaper of the present invention comprises an absorbent body, a left waist layer, and a right waist layer. The left waist layer and the absorbent body are fixedly connected at the upper left corner, and the right waist layer is connected at the upper right corner of the absorbent body. The overall product has a briefs-type structure. The width of the rear section of the left waist layer and the rear waist layer is greater than the width of the front section, that is, the area at the buttocks position is larger, which can provide sufficient space to wrap the buttocks, is not only more fitting but also less likely to leak.

[0041] 2. The waist area and front area of ​​the product are greatly reduced compared to ordinary pant-type sanitary napkins, and the overall structure is breathable, light and not heavy.

[0042] 3. The waist area is folded twice to make the waist more firm.

[0043] 4. The absorbent body has a convex area, which fits the human body more closely.

[0044] 5. The longitudinal length of the liquid-permeable surface layer and the liquid-impermeable bottom layer of the absorbent body is longer than the longitudinal length of the absorbent core, making the waist area more breathable.

[0045] 6. The rear end width of the left and right two pieces is greater than the front end width, and the rear end width is more than 20% wider than the front end width. When the left and right waistlines are sealed to the absorbent layer and worn, the front sealing line is on the front of the human body, 5-50mm away from the front end bulge of the hip bone, and the rear end sealing line is on the back of the human body. In this way, when worn, the front piece remains at the front of the human body and will not be "stuck in the legs". The back piece is designed to wrap the entire buttocks and extend to close to the front end of the hip bone. When a person moves, the back piece is stretched to better wrap the buttocks.

[0046] 7. When the pant-type sanitary napkin is torn open along the left front connecting part, the left rear connecting part, the right front connecting part and the right rear connecting part and unfolded in sequence, the product can be divided into one left piece, two left pieces, the absorbent body, one right piece and two right pieces. There is no other connection between the pieces except the connection parts sealed by the side seals. The above design can ensure that there are no connecting protrusions between the non-woven fabrics when the product is worn, and the overall product is flat and free of foreign body feeling.

[0047] 8. Since the thickness of the human buttocks is significantly greater than that of the front crotch area, the corresponding requirement for briefs is that the back section should have greater capacity than the front section. With the narrowest crotch line as the dividing line, the back section of the product is at least 10% longer than the front section, increasing the capacity of the back section by at least 10% when worn.

[0048] 9. In the present invention, there are two key design lines, namely the narrowest line of the crotch and the product folding line. The narrowest line of the crotch is in front of the product folding line. Sometimes the back end of the consumer wears it too low. At this time, since the narrowest line is in front of the lowest line of the crotch, the front piece can be slightly pulled down and the back piece can be slightly lifted up to adjust to a comfortable position where the front and back pieces are the same height. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Is a schematic structural diagram of a sanitary napkin embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of a product according to an embodiment of the present invention;

[0051] Figure 3A schematic diagram of the preparation process of an embodiment of the present invention;

[0052] Figure 4 Schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0053] Figure 5 This is a schematic diagram of a three-dimensional structure from another angle in an embodiment of the present invention;

[0054] Figure 6 This is a schematic diagram of the product structure during the preparation process in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are:

[0056] refer to Figures 1 to 6 A briefs-type sanitary napkin comprises an absorbent body 1, a left waist layer 2, and a right waist layer 3. The absorbent body 1 is defined as having a longitudinal direction along the length direction and a transverse direction along the width direction. The absorbent body 1 comprises a liquid-permeable surface layer 11, an absorbent core 12, and a liquid-impermeable bottom layer 13 stacked in sequence from top to bottom. The longitudinal dimension of the absorbent core 12 is shorter than the longitudinal dimensions of the liquid-permeable surface layer 11 and the liquid-impermeable bottom layer 13. The left waist layer 2 and the right waist layer 3 each comprise a waist outer layer, an elastic material layer, and a waist inner layer stacked in sequence from outside to inside.

[0057] The left waist layer 2 and the absorbent body 1 have a left front connecting part 4 and a left rear connecting part 5, and the right waist layer 3 and the absorbent body 1 have a right front connecting part 6 and a right rear connecting part 7. It is defined that the angles formed by the left front connecting part 4 and the right front connecting part 6 with the longitudinal center line of the absorbent body 1 are both front sealing angles α, and the angles formed by the left rear connecting part 5 and the right rear connecting part 7 with the longitudinal center line of the absorbent body are both rear sealing angles β. The front sealing angle α=45°, and the rear sealing angle β=30°.

[0058] The left front connection part 4 is an area formed by ultrasonic welding the front side of the left waist layer 2 and the left front side of the absorbent body 1, the left rear connection part 5 is an area formed by ultrasonic welding the rear side of the left waist layer 2 and the left rear side of the absorbent body 1, the right front connection part 6 is an area formed by ultrasonic welding the front side of the right waist layer 3 and the right front side of the absorbent body 1, and the right rear connection part 7 is an area formed by ultrasonic welding the rear side of the right waist layer 3 and the right rear side of the absorbent body 1.

[0059] The left waist layer 2 comprises a left first sheet 21 and a left second sheet 22, connected in sequence along the transverse direction. The elastic material layer of the left first sheet 21 is elastic spandex yarn, and the elastic material layer of the left second sheet 22 is elastic non-woven fabric. The right waist layer 3 comprises a right first sheet 31 and a right second sheet 32, connected in sequence along the transverse direction. The elastic material layer of the right first sheet 31 is elastic spandex yarn, and the elastic material layer of the right second sheet 32 ​​is elastic non-woven fabric. The other sides of the left second sheet 22 and the other sides of the right second sheet 32 ​​are ultrasonically welded to the absorbent body 1. The elastic spandex yarns of the left first sheet 21 and the right first sheet are distributed in the waist and leg areas, with the leg areas surrounding the leg openings.

[0060] A central convex absorbent core 11 is provided in the middle of the absorbent body 1 .

[0061] The left piece and the right piece are both folded inward twice in the longitudinal direction, so that the waist area has more elasticity and thickness and is more stable.

[0062] The rear widths of the left and right panels 22 and 32 at the waistline are both greater than the front widths. Specifically, in this embodiment, the rear widths are about 20% wider than the front widths.

[0063] The left front connecting part 4 and the right front connecting part 6 are distributed on the front of the human body and are 20 mm away from the front end convex point of the hip bone, so there will be no foreign body sensation when lying on the side.

[0064] The product is defined as having a front panel 14 and a back panel 15 with the narrowest line of the crotch as the dividing line. The back panel 15 of the product is 30% longer than the front panel 14 of the product, and the wrapping area of ​​the back panel is 30% larger than the wrapping area of ​​the front panel.

[0065] The left waist layer 2 and the right waist layer 3 are provided with leg opening circles 8 which are asymmetrical in left and right sections and front and back sections; the leg opening circle 8 includes a flat end 81 on the upper side, a sharp end 82 on the lower side, and a first connecting end 83 connected to the left end of the sharp end 82 and the flat end 81, and a second connecting end 84 connected to the right end of the sharp end 82 and the flat end 81. The cross-section of the leg opening circle 8 from the flat end 81 to the sharp end 82 first changes from small to large and then from large to small until it reaches zero.

[0066] The left waist layer and the right waist layer are formed into asymmetrical leg O-rings with left and right sections and front and back sections through an O-shaped cutter. This cutting cuts off the middle section of the waist layer and transfers the waste material, and the subsequent waist folding is achieved by using the still connected parts of the front and back sections. For the asymmetrical leg O-rings, the curvature of the left end of the leg of the left waist layer is different from that of the right end, and the curvature of the left end of the leg of the right waist layer is different from that of the right end, that is, the curvature of the first connecting end 83 is different from that of the second connecting end 84.

[0067] The leg elastic material layer is arranged along the leg O-ring, which can be arranged along the entire O-ring or along a portion of the O-ring. Preferably, in this embodiment, the elastic material layer of the left waist layer is arranged along the O-ring on the left piece, and the elastic material layer of the right waist layer is arranged along the O-ring on the right piece.

[0068] More specifically, taking the medium-sized brief-style sanitary napkin as an example, when unfolded, the left and right waistbands measure 625mm, the absorbent layer is 630mm long, and the absorbent core is 475mm long. The waistband is folded twice, with an overlap of 20mm. The stretch ratio of the elastic spandex material at the waistband is 2.5, while the stretch ratio of the elastic non-woven fabric at the waistband is 2.0. When worn, the side seams are approximately 20mm from the front ridge of the hip bone. The front panel of the outer garment is 30% longer than the back panel, measured at the narrowest point of the crotch, significantly increasing the back panel's support and capacity.

[0069] The method for preparing the above-mentioned briefs-type sanitary napkin comprises the following steps:

[0070] (1) Preparation of absorbent body: a. Mixing fluff pulp, high molecular weight water-absorbent resin, and long fibers and feeding the mixture into a mold wheel for forming; b. Attaching a wrapping layer to obtain an absorbent core layer; c. Online compounding of a liquid-permeable surface layer and a liquid-impermeable bottom layer to obtain a continuously transporting absorbent body 1;

[0071] (2) preparing a left waist layer 2 and a right waist layer 3: the left waist layer 2 comprises a left single piece 21 and a left second piece 22 sequentially connected in a transverse direction, and the right waist layer 3 comprises a right single piece 31 and a right second piece 32 sequentially connected in a transverse direction;

[0072] The preparation process of the left first sheet and the left second sheet is as follows: the first non-woven fabric, the first elastic material layer and the second non-woven fabric are sequentially composited by online transmission to obtain a first composite article with a three-layer structure, the first composite article is divided into a left first region and a left second region that are integrally connected, the dividing line between the left first region and the left second region is defined as a left pre-folding line, the first elastic material layer distributed in the left first region is composed of elastic spandex yarn and elastic non-woven fabric, the first elastic material layer distributed in the left second region is an elastic non-woven fabric, the left first region portion of the first composite article is defined as the left first sheet, and the left second region of the first composite article is defined as the left second sheet;

[0073] The preparation process of the right first sheet and the right second sheet is as follows: the third non-woven fabric, the second elastic material layer and the fourth non-woven fabric are sequentially composited by online transmission to obtain a second composite article with a three-layer structure, the second composite article is divided into a right first region and a right second region that are integrally connected, the boundary line between the right first region and the right second region is defined as a right pre-folding line, the second elastic material layer in the right first region is composed of elastic spandex yarn and elastic non-woven fabric, the second elastic material layer in the right second region is elastic non-woven fabric, the right first region portion of the second composite article is defined as the right first sheet, and the right second region portion of the second composite article is defined as the right second sheet;

[0074] The first elastic material layer and the second elastic material layer both include a waist elastic material layer and a leg elastic material layer arranged along the leg openings, the first elastic material layers distributed in the left region and the right region include a waist elastic material layer and a leg elastic material layer, the waist elastic material layer is made of elastic spandex yarn, and the leg elastic material layers are also made of elastic spandex yarn;

[0075] (3) Folding the left and right pieces inwards on both sides respectively to obtain the left and right pieces with waist reinforcement structures;

[0076] (4) The right ends of the two left sheets and the left ends of the two right sheets prepared in step (2) are fixed to the longitudinal sides of the absorber by ultrasonic bonding along one longitudinal side;

[0077] (5) Cut out leg opening circles 8 from the left waist layer and the right waist layer;

[0078] (6) Turn the left piece and the right piece 180° along the left pre-folding line and the right pre-folding line respectively;

[0079] (7) The upper and lower sides of the left sheet are sealed and connected to the left end of the absorbent body, and the upper and lower sides of the right sheet are sealed and connected to the right end of the absorbent body. After sealing, a left front connecting part, a left rear connecting part, a right front connecting part, and a right rear connecting part are formed. The angles formed by the left front connecting part and the right front connecting part with the longitudinal center line of the absorbent body are defined as front sealing angles, and the angles formed by the left rear connecting part and the right rear connecting part with the longitudinal center line of the absorbent body are defined as rear sealing angles. The front sealing angle and rear sealing angle are 30-60°. In this embodiment, the front sealing angle is 45° and the rear sealing angle is 30°.

[0080] (8) Cutting the product along the edge of the connecting seal position to obtain a single piece of briefs-type sanitary napkin;

[0081] (9) Folding and packaging.

[0082] The present invention provides a brief-style sanitary napkin with a leg opening ring structure that differs from a traditional O-ring. By cutting out the leg opening ring, front and back panels of different sizes are formed, resulting in a sanitary napkin with a brief-style structure. Elastic material is provided around the leg opening rings. The elastic material may be elastic spandex, an elastic film, or an elastic non-woven fabric. The back panel is wider than the front panel, allowing the weld points on both sides to be located closer to the triangular area rather than the waist. This eliminates any foreign body sensation during use, making it more comfortable, especially when lying on one's side. The elastic material layer of the leg opening rings can be arranged along the entire circumference or only along the circumferences of the left and right panels.

[0083] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A method for preparing a briefs-type sanitary napkin, characterized in that: The method comprises the following preparation steps: (1) Preparation of absorbent body: a. Mixing fluff pulp, high molecular weight water-absorbent resin, and long fibers and feeding them into a mold wheel for forming; b. Attaching a wrapping layer to obtain an absorbent core layer; c. Online compounding of a liquid-permeable surface layer and a liquid-impermeable bottom layer to obtain a continuously transporting absorbent body; (2) preparing a left waist layer and a right waist layer: the left waist layer comprises a left sheet and two left sheets connected in sequence along the transverse direction, and the right waist layer comprises a right sheet and two right sheets connected in sequence along the transverse direction; The preparation process of the left first sheet and the left second sheet is as follows: a first non-woven fabric, a first elastic material layer, and a second non-woven fabric are sequentially composited online to obtain a first composite article having a three-layer structure, wherein the first composite article is divided into a first left region and a second left region that are integrally connected, a dividing line between the first left region and the second left region is defined as a left pre-folding line, the first left region portion of the first composite article is defined as the left first sheet, and the second left region of the first composite article is defined as the left second sheet; The preparation process of the right first sheet and the right second sheet is as follows: the third non-woven fabric, the second elastic material layer and the fourth non-woven fabric are sequentially transferred and compounded online to obtain a second composite object with a three-layer structure, the second composite object is divided into a right first region and a right second region that are integrally connected, a dividing line between the right first region and the right second region is defined as a right pre-folding line, the right first region portion of the second composite object is defined as the right first sheet, and the right second region portion of the second composite object is defined as the right second sheet; (3) Folding the left and right pieces inwards on both sides respectively to obtain the left and right pieces with waist reinforcement structures; (4) Fix the right ends of the two left sheets and the left ends of the two right sheets prepared in step (2) along one longitudinal side to the two longitudinal sides of the absorbent body respectively; (5) Cutting leg openings in the left waist layer and the right waist layer, so that the left waist layer and the right waist layer are provided with leg openings that are asymmetrical in both left and right sections and front and back sections; the leg openings include a flat end on the upper side, a sharp end on the lower side, and a first connecting end connected to the left end of the sharp end and the flat end, and a second connecting end connected to the right end of the sharp end and the flat end, and the cross-section of the leg opening from the flat end to the sharp end first increases from small to large and then decreases from large to small until it reaches zero; (6) Turn the left piece and the right piece 180° along the left pre-folding line and the right pre-folding line respectively; (7) The upper and lower sides of the left sheet are sealed and connected to the left end of the absorbent body, and the upper and lower sides of the right sheet are sealed and connected to the right end of the absorbent body. After sealing, a left front connecting part, a left rear connecting part, a right front connecting part, and a right rear connecting part are formed. The angles formed by the left front connecting part and the right front connecting part with the longitudinal center line of the absorbent body are defined as front sealing angles, and the angles formed by the left rear connecting part and the right rear connecting part with the longitudinal center line of the absorbent body are defined as rear sealing angles. The front sealing angle and rear sealing angle are defined as 30-60°. (8) Cutting the product along the edge of the connecting seal position to obtain a single piece of briefs-type sanitary napkin; (9) Folding and packaging.

2. The method for preparing a briefs-type sanitary napkin according to claim 1, wherein: Steps (7) and (8) can also be achieved in one step by using a knife roller that seals and cuts in one.

3. The method for preparing a briefs-type sanitary napkin according to claim 1, wherein: The first elastic material layer comprises a waist elastic material layer and a leg elastic material layer arranged along the leg opening circle, the second elastic material layer comprises a waist elastic material layer and a leg elastic material layer arranged along the leg opening circle, the first elastic material layer distributed in the left area and the right area comprises a waist elastic material layer and a leg elastic material layer, the first elastic material layer distributed in the left second area is an elastic non-woven fabric or an elastic film, the second elastic material layer in the right second area is an elastic non-woven fabric or an elastic film, the waist elastic material layer is elastic spandex yarn, and the leg elastic material layer is elastic spandex yarn or elastic non-woven fabric or an elastic film.

4. The method for preparing a briefs-type sanitary napkin according to claim 1, wherein: The fixing method in step (4) is ultrasonic bonding or gluing bonding.

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