CN116712257A - Preparation method of briefs type sanitary towel - Google Patents

Abstract

The application relates to the field of sanitary products, and provides a preparation method of a pair of briefs type sanitary towel, which solves the defect that the pair of briefs type sanitary towel in the prior art is relatively airtight and has foreign body sensation when lying on one's side, and comprises the following preparation steps: (1) preparing an absorber; (2) preparing a left waistline layer and a right waistline layer; (3) Respectively inwards turning over the left sheet and the right sheet to obtain a left sheet and a right sheet with waistline reinforcing structures; (4) Fixing the right ends of the left two sheets and the left ends of the right two sheets prepared in the step (2) on the two longitudinal side edges of the absorber along one longitudinal side respectively; (5) Cutting leg opening rings into the left waistline layer and the right waistline layer; (6) Turning the left piece and the right piece for 180 degrees along the left pre-turning fold line and the right pre-turning fold line respectively; (7) The upper side and the lower side of the left piece are in sealing connection with the left end of the absorber; (8) Cutting the product along the edge of the connecting and sealing position to obtain a single briefs type sanitary towel; (9) folding and packaging.

Description

A kind of preparation method of briefs type sanitary napkin

This application is a divisional application for the patent application number: 2022109609471, the filing date is: 2022.08.11, and the patent name is: a briefs-type sanitary napkin and a preparation method thereof.

Technical field

The present invention relates to the field of sanitary products, and in particular to a method for preparing briefs-type sanitary napkins.

Background technique

Existing menstrual pants-type sanitary napkins are generally composed of an absorbent layer and an outer garment layer. The absorbent layer and the outer garment layer are independent units. The usual process is to form the outer garment layer and the absorbent layer independently, and then the absorbent layer Laminated to the outer garment layer. The above-mentioned menstrual pants have a larger shape, a larger waist area, and a larger layout of waist elastic materials. On the one hand, the material cost becomes higher, and on the other hand, the waist breathability is poor. At the same time, the production line process of the above-mentioned menstrual pants is long, the equipment structure is large, and the equipment cost is high.

The width of the front piece and the back piece of the existing pant-type sanitary napkin are the same. When the front piece and the back piece are sealed and worn, the sealing line is at the back of the left and right ends of the human body. When the person moves, the front piece is Pulling it to the rear position will restrict movement, commonly known as "leg jamming". The back piece cannot wrap forward and the pulling force is insufficient. If the pulling force of the back piece is extended to the front of the human body on the pant-type sanitary napkin, it will have better wrapping properties. .

When the human body is moving (walking, squatting, leg raising, etc.), since the legs move forward and upward, the pants are basically pulled upward. Therefore, in order to adapt to ergonomics, underwear and menstrual triangles The design of trousers should follow the principle of "the front piece should be trimmed completely without jamming the legs, and the back piece should be able to cover multiple bags and have elasticity." The front piece should be designed to cover the triangle area but not exceed the leg-raising line of the triangle area so as to affect leg-raising walking, etc. In daily movements, the back piece can cover the buttocks to the smile line as much as possible to reduce the displacement of the absorbent body and the problems of side leakage and rear leakage.

Chinese Patent No. 201921966686.4 discloses a sanitary trousers for women during menstruation, which includes a trousers body. The trousers body includes a front fitting part, a rear fitting part and a crotch part. The front fitting part is equipped with a self-heating sheet facing the uterus, and the crotch part is equipped with a physiotherapy device. Adsorption structure. The physical therapy adsorption structure includes a tightly connected surface permeable layer, a mugwort soft foaming layer, a water-absorbent layer and a bottom breathable layer stacked in sequence from the inside to the outside. The mugwort soft foaming layer is a spunlace with added mugwort extract. Non-woven fabric. The sanitary trousers have functions of uterine warming and menstrual care. When using them, wear sanitary trousers and tear off the self-heating sheet to automatically heat the uterus to keep the uterus warm. On the other hand, the adsorption structure can quickly absorb liquids to keep the body clean, refreshing and breathable. ; At the same time, the mugwort gas emitted through the soft foam layer of mugwort sterilizes and cleans the lower body, playing a nursing role. Moreover, the sanitary pants are disposable products, easy to use and fully functional, and are suitable for use by women with dysmenorrhea or cold constitution during menstruation. However, the front and rear fitting parts of the sanitary trousers are relatively wide and long, which makes them hot and stuffy to use. In addition, the welding fixing parts on the left and right sides of the front and rear fitting parts of the sanitary pants are on both sides, making it easy for the user to lie on their side. A foreign body sensation occurs in the welded part.

Contents of the invention

Therefore, in view of the above-mentioned problems, the present invention provides a method for preparing a pant-type sanitary napkin, which solves the defects of the prior art pant-type sanitary napkins that are relatively airtight and have a foreign body sensation when lying on the side.

In order to achieve the above object, the present invention adopts the following technical solution: a brief sanitary napkin, including an absorbent body, a left waist layer, and a right waist layer. It is defined that the absorbent body has a longitudinal direction along the length direction and a transverse direction along the width direction. , the absorbent body includes a liquid-permeable surface layer, an absorbent core and a liquid-impermeable bottom layer that are stacked in sequence from top to bottom. The longitudinal dimension of the absorbent core is shorter than the liquid-permeable surface layer and the liquid-impermeable bottom layer. The longitudinal dimensions of the left waist layer and the right waist layer include an outer waist layer, an elastic material layer and an inner waist layer that are laminated in sequence from the outside to the inside;

The left waist layer and the absorbent body have a left front connection part and a left rear connection part, and the right waist layer and the absorber have a right front connection part and a right rear connection part, defining the left front connection part and the right front connection part respectively with the longitudinal direction of the absorber body. The angles formed by the center line are all front sealing angles, and the angles formed by the left rear connection part and the right rear connection part respectively with the longitudinal centerline of the absorber are rear sealing angles. The front sealing angle and the rear sealing angle are 30-60°;

The left waist layer and the right waist layer are provided with asymmetric leg opening rings in the left and right sections and the front and rear sections;

The definition takes the narrowest line in the transverse direction of the crotch as the dividing line. The product has a front piece and a back piece. The longitudinal length of the back piece is more than 10% longer than the front piece; the wrapping area of the back piece is larger than the wrapping area of the front piece. The area is more than 20% larger; the left waist layer and the right waist layer are provided with leg elastic material layers around the leg opening circles.

Further: 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 first connecting end connected to the right end of the sharp end and the flat end. At the second connecting end of the leg opening ring, the cross section of the leg opening circle from the flat end to the sharp end first changes from small to large and then from large to small until it is zero.

Further: the leg elastic material layer is distributed around the first connecting end or around the first connecting end and the second connecting end.

Further: the front sealing angle and the rear sealing angle are 30-60°.

Further: the left front connection part is the area formed by the fixed connection between the front side of the left waistline layer and the left front side of the absorber through ultrasonic waves, glue or hot pressing, and the left rear connection part is the area between the back side of the left waistline layer and the absorbent body. The left rear side of the body is connected and formed by ultrasonic waves, gluing or hot pressing. The right front connection is the area where the front side of the right waist layer and the right front side of the absorber are connected by ultrasonic waves, gluing or hot pressing. , the right rear connection part is a region formed by a fixed connection between the rear side of the right waist layer and the right rear side of the absorber through ultrasonic waves, glue or heat pressing.

Further: the left waistline layer has a left piece and a left 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 two pieces is elastic non-woven fabric or elastic. Membrane, the right waist layer has one right piece and two right pieces 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 two right pieces is elastic non-woven fabric or elastic film , the other sides of the two left pieces and the other sides of the two right pieces are fixedly connected to the absorber respectively.

Further: the middle part of the absorbent body is provided with a convex absorbent core.

Further: the second left piece and the second right piece are fixedly connected to the absorber through ultrasonic waves or glue respectively.

Further: the thickness of the left piece and the right piece is thicker than that of the second left piece and the second right piece.

Further: the width of the second left piece and the second right piece on the back side of the waistline is greater than the width on the front side.

Further: the rear side width is more than 20% wider than the front side width.

Further: when the pant-type sanitary napkin is torn apart and unfolded sequentially along the left front connecting part, left rear connecting part, right front connecting part, and right rear connecting part, the product can be divided into a left piece, a left piece, an absorbent body, and a right piece. There are one piece and two pieces on the right. There are no other connections between the pieces except for the side-sealed connection, so that when the product is worn, there are no connection bulges between the non-woven fabrics, and the entire product is smooth and has no foreign body feeling.

Further: the left front connecting part and the right front connecting part are distributed in the front position of the human body and are 5-50 mm away from the frontmost protruding point of the hip bone.

A method for preparing briefs-type sanitary napkins, including the following preparation steps:

(1) Prepare the absorbent body: a. Mix fluff pulp, polymer water-absorbent resin, and long fibers and send them to the mold wheel for molding; b. Attach the wrapping layer to obtain the absorbent core layer; c. Composite the liquid-permeable surface layer online and a liquid-impermeable backsheet for an absorbent body with continuous transmission;

(2) Prepare a left waistline layer and a right waistline layer: the left waistline layer has one left piece and two left pieces connected in sequence along the transverse direction, and the right waistline layer has one right piece and two right pieces connected in sequence along the transverse direction;

The preparation process of the left piece and the left piece is as follows: the first non-woven fabric, the first elastic material layer and the second non-woven fabric are sequentially transmitted and compounded online to obtain a first composite article with a three-layer structure. The 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 the left pre-turning fold line. The left first region of the first composite article is defined as the left piece. The second left area of a composite object is defined as the second left piece;

The preparation process of the right piece and the second right piece is: the third non-woven fabric, the second elastic material layer and the fourth non-woven fabric are sequentially transmitted and compounded online to obtain a second composite article with a three-layer structure. The composite item is divided into the first right area and the second right area that are integrally connected. The dividing line between the first right area and the second right area is defined as the right pre-turning fold line. The right area of the second composite item is defined as the right piece. The second composite item is defined as the right piece. The second right area of the item is defined as the second right piece;

(3) Fold the left and right pieces inward on both sides respectively to obtain the left and right pieces with a waist-reinforced structure;

(4) Fix the right end of the second left piece and the left end of the second right piece prepared in step (2) along the longitudinal side respectively on both longitudinal sides of the absorber;

(5) Cut out leg opening circles from the left and right waist layers;

(6) Flip the left piece and the right piece 180° along the left pre-turning fold line and the right pre-turning fold line respectively;

(7) Sealing and connecting the upper and lower sides of the left piece to the left end of the absorber, and sealing and connecting the upper and lower sides of the right piece to the right end of the absorber. After sealing, a left front connecting part, a left rear connecting part, a right front connecting part, a right connecting part are formed. The rear connection part defines that the angles between the left front connection part and the right front connection part and the longitudinal centerline of the absorber are both front sealing angles, and the angles between the left rear connection part and the right rear connection part and the longitudinal centerline of the absorber are both is the rear sealing angle, and the front sealing angle and the rear sealing angle are 30-60°;

(8) Slit the product along the edge connecting the sealing position to obtain a single piece of briefs-style sanitary napkin;

(9) Folding and packaging.

Further: Steps (7) and (8) can also be realized in one step through the integrated sealing and cutting knife roller.

Further: the first elastic material layer includes a waist elastic material layer and a leg elastic material layer arranged along the leg opening circle, and the second elastic material layer includes a waist elastic material layer and a leg elastic material layer arranged along the leg opening circle. The leg circumference elastic material layer, the first elastic material layer distributed in the left area and the right area includes the waist elastic material layer and the leg circumference elastic material layer, the first elastic material layer distributed in the left two areas is elastic non-woven cloth or elastic film, the second elastic material layer in the second right area is elastic non-woven fabric or elastic film, the waist elastic material layer is elastic spandex yarn, the leg elastic material layer is elastic spandex yarn or elastic Non-woven fabric or elastic film.

Further: the fixing method in step (4) is ultrasonic composite or glue composite.

By adopting the aforementioned technical solutions, the beneficial effects of the present invention are:

1. The briefs-type diaper of the present invention includes an absorbent body, a left waistline layer, and a right waistline layer. The left waistline layer and the absorbent body have a fixed connection area in the upper left corner, and the right waistline layer has a connection area in the upper right corner of the absorbent body. , the product has a briefs-like structure as a whole. The width of the rear section of the left waistline layer and the rear waistline layer is greater than the width of the front section. That is, the hip area is larger, which can provide enough space to wrap the hips. It is not only more fitting but also less prone to external injuries. leak.

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

3. The waist area has been folded twice to make the waist stronger.

4. The absorbent body has a convex area and fits the human body more closely.

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

6. The rear end width of the left and right two panels 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 and the absorbent layer are sealed and worn, the front end sealing line is at The position of the front of the human body is 5-50mm away from the frontmost convex point of the hip bone, and the back-end sealing line is at the back of the human body. In this way, when wearing, the front piece is kept at the front of the human body and will not "stuck the legs". The back piece is designed to It wraps the entire butt and extends to close to the front of the hip bone. When the person moves, the back piece is stretched to better realize the wrapping of the butt.

7. When the pant-type sanitary napkin is torn and unfolded along the left front connection part, left rear connection part, right front connection part and right rear connection part and unfolded in sequence, the product can be divided into one left piece, two left pieces, absorbent body, and one right piece , the two pieces on the right, there are no other connections between each piece except for the side sealing connection. The above design can make the product have no connection bulges between non-woven fabrics when being worn, and the whole product is smooth and has no foreign body feeling.

8. Since the thickness of the buttocks of the human body is significantly greater than the thickness of the front triangle area, the corresponding capacity of the briefs is that the capacity of the back piece of the briefs is greater than the capacity of the front piece. In the present invention, the narrowest line of the crotch is used as the dividing line. The rear section of the product is more than 10% longer than the front section of the product. When worn, the capacity of the rear piece is increased by more than 10% compared to the front piece.

9. In the present invention, there are two key design lines, namely the narrowest crotch line and the product folding line. The narrowest crotch line is in front of the product folding line. When consumers wear it, the rear end is sometimes low. At this time, due to If the narrowest line is in front of the lowest line of the crotch, you can pull the front piece down slightly and lift the back piece up slightly to adjust it to a comfortable position where the front and back pieces are at the same height.

Description of the drawings

Figure 1 is a schematic structural diagram of a sanitary napkin in an embodiment of the present invention;

Figure 2 is a schematic diagram of product expansion according to the embodiment of the present invention;

Figure 3 is a schematic diagram of the preparation process of an embodiment of the present invention;

Figure 4 is a schematic three-dimensional structural diagram of an embodiment of the present invention;

Figure 5 is a schematic diagram of the three-dimensional structure from another angle according to the embodiment of the present invention;

Figure 6 is a schematic diagram of the unfolded structure of the product during the preparation process in the embodiment of the present invention.

Detailed ways

The embodiment of the invention is:

Referring to Figures 1 to 6, a brief sanitary napkin includes an absorbent body 1, a left waist layer 2, and a right waist layer 3. It is defined that the absorbent body 1 has a longitudinal direction along the length direction and a transverse direction along the width direction, so The absorbent body 1 includes a liquid-permeable surface layer 11, an absorbent core 12 and a liquid-impermeable bottom layer 13 that are laminated in sequence from top to bottom. The longitudinal dimension of the absorbent core 12 is shorter than the liquid-permeable surface layer 11 and the liquid-impermeable bottom layer 13. The longitudinal dimensions of the liquid-permeable bottom layer 13. The left waist layer 2 and the right waist layer 3 each include an outer waist layer, an elastic material layer and an inner waist layer that are stacked in sequence from outside to inside;

The left waist layer 2 and the absorbent body 1 have a left front connection part 4 and a left rear connection part 5, and the right waist layer 3 and the absorbent body 1 have a right front connection part 6 and a right rear connection part 7, defining the left front connection part 4 and The angles formed by the right front connecting portion 6 and the longitudinal centerline of the absorbent body 1 are both front sealing angles α, and the angles formed by the left rear connecting portion 5 and the right rear connecting portion 7 respectively and the longitudinal centerline of the absorbent body are both rear sealing angles. Angle β, the front sealing angle α=45°, and the rear sealing angle β=30°.

The left front connection part 4 is the area formed by ultrasonic welding between the front side of the left waist layer 2 and the left front side of the absorber 1, and the left rear connection part 5 is the area between the back side of the left waist layer 2 and the left rear side of the absorber 1. The right front connection part 6 is an area formed by ultrasonic welding between the front side of the right waist layer 3 and the right front side of the absorber 1 , and the right rear connection part 7 is the rear side of the right waist layer 3 The area formed by ultrasonic welding between the side and the right rear side of the absorber 1.

The left waist layer 2 has a left piece 21 and a second left piece 22 connected in sequence along the transverse direction. The elastic material layer of the left piece 21 is elastic spandex yarn, and the elastic material layer of the second left piece 22 is elastic non-woven fabric. , the right waist layer 3 has a right piece 31 and a second right piece 32 connected in sequence along the transverse direction. The elastic material layer of the right piece 31 is elastic spandex yarn, and the elastic material layer of the second right piece 32 is elastic non-woven. cloth, the other sides of the second left piece 22 and the other side of the second right piece 32 are respectively welded to the absorber 1 through ultrasonic waves. The elastic spandex yarns of the left piece 21 and the right piece are distributed in the waist area and the leg area, and the leg area is around the leg opening circle.

The absorbent body 1 is provided with a convex absorbent core 11 in the middle.

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.

The width of the back side of the waistline of the second left piece 22 and the second right piece 32 is greater than the width of the front side. Specifically, in this embodiment, the width of the back side is about 20% wider than the width of the front side.

The left front connecting part 4 and the right front connecting part 6 are distributed in the front position of the human body and are 20mm away from the frontmost protruding point of the hip bone. There will be no foreign body sensation when lying on the side.

The definition takes the narrowest line of the crotch as the dividing line. The product has a front piece 14 and a back piece 15. The back piece 15 of the product is 30% longer than the front piece 14 of the product. The wrapping area of the back piece is larger than the front piece. The parcel area is 30% larger.

The left waist layer 2 and the right waist layer 3 are provided with leg opening rings 8 with asymmetrical left and right sections and front and rear sections; the leg opening rings 8 include a flat end 81 on the upper side and a flat end 81 on the lower side. The sharp end 82 and the first connecting end 83 connected to the left end of the sharp end 21 and the flat end 81, the second connecting end 84 connected to the right end of the sharp end 82 and the flat end 81, the leg opening ring 8 The cross section from the flat end 81 to the sharp end 82 first changes from small to large and then from large to small until it is zero.

The left waistline layer and the right waistline layer are formed by an O-shaped cutter to form an asymmetrical leg circumference O-ring in the left and right sections and the front and rear sections. This cutting cuts off the middle section of the waistline layer and transfers the waste material, and the front and rear section materials are still connected. The part realizes the subsequent waist folding, the asymmetric leg O-ring, the left end curvature of the leg circumference of the left waist circumference layer is different from the right end arc, and the left end curvature of the leg circumference of the right waist circumference layer is different from the right end arc, that is, the first connection The curvature of end 83 is different from the curvature of second connecting end 84 .

The leg circumference elastic material layer is arranged along the position of the leg circumference O-ring, which may be arranged along the entire O-ring, or may be arranged along part of the O-ring. Preferably, in this embodiment, the elastic material layer of the left waistline layer is arranged along the O-ring on the left piece, and the elastic material layer of the right waistline is arranged along the O-ring on the right piece.

To be more specific, take a medium size menstrual briefs sanitary napkin as an example. After the menstrual sanitary napkin is unfolded, the length of the left and right waists is 625mm, the length of the absorbent body layer is 630mm, and the length of the absorbent core of the absorbent body layer is 475mm. The waist is folded twice, and the overlapped waist width is 20mm after folding. The stretch ratio of the waist elastic spandex material is 2.5; the stretch ratio of the waist elastic non-woven fabric is 2.0; when worn, the side seal is about 20mm away from the frontmost point of the hip bone. Taking the narrowest part of the crotch as the limit, the front piece of the outer clothing layer is 30% longer than the back piece of the outer clothing layer, which greatly increases the wrapping and capacity of the back piece material on the buttocks.

The above-mentioned preparation method of briefs-type sanitary napkins includes the following preparation steps:

(1) Prepare the absorbent body: a. Mix fluff pulp, polymer water-absorbent resin, and long fibers and send them to the mold wheel for molding; b. Attach the wrapping layer to obtain the absorbent core layer; c. Composite the liquid-permeable surface layer online and a liquid-impermeable bottom layer to obtain a continuous transmission absorber 1;

(2) Prepare the left waistline layer 2 and the right waistline layer 3: the left waistline layer 2 has a left piece 21 and a second left piece 22 connected sequentially along the transverse direction, and the right waistline layer 3 has a right waistline layer 3 connected sequentially along the transverse direction. One piece is 31 and the second piece on the right is 32;

The preparation process of the left piece and the left piece is as follows: the first non-woven fabric, the first elastic material layer and the second non-woven fabric are sequentially transmitted and compounded online to obtain a first composite article with a three-layer structure. The composite article is divided into a first left area and a second left area that are integrally connected. The dividing line between the first left area and the second left area is defined as the left pre-turning fold line. The first elastic material layer distributed in the first left area is It is composed of elastic spandex yarn and elastic non-woven fabric. The first elastic material layer distributed in the second left area is elastic non-woven fabric. The left area of the first composite article is defined as the left piece, and the second left area of the first composite article is defined as It is the second piece from the left;

The preparation process of the right piece and the second right piece is: the third non-woven fabric, the second elastic material layer and the fourth non-woven fabric are sequentially transmitted and compounded online to obtain a second composite article with a three-layer structure. The composite article is divided into a first right area and a second right area that are integrally connected. The dividing line between the first right area and the second right area is defined as the right pre-folding line. The second elastic material layer in the right area is elastic spandex yarn. The second elastic material layer in the second right area is an elastic non-woven fabric. The first right area of the second composite article is defined as the right piece, and the second right area of the second composite article is defined as the second right area. piece;

Both the first elastic material layer and the second elastic material layer include 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 the waist elastic material layer. Elastic material layer and leg elastic material layer, the waist elastic material layer is elastic spandex yarn, and the leg elastic material layer is also elastic spandex yarn;

(3) Fold the left and right pieces inward on both sides respectively to obtain the left and right pieces with a waist-reinforced structure;

(4) Fix the right end of the second left piece and the left end of the second right piece prepared in step (2) along the longitudinal side by ultrasonic composite fixation on both longitudinal sides of the absorber;

(5) Cut out leg opening circles 8 from the left and right waist layers;

(6) Flip the left piece and the right piece 180° along the left pre-turning fold line and the right pre-turning fold line respectively;

(7) Sealing and connecting the upper and lower sides of the left piece to the left end of the absorber, and sealing and connecting the upper and lower sides of the right piece to the right end of the absorber. After sealing, a left front connecting part, a left rear connecting part, a right front connecting part, a right connecting part are formed. The rear connection part defines that the angles between the left front connection part and the right front connection part and the longitudinal centerline of the absorber are both front sealing angles, and the angles between the left rear connection part and the right rear connection part and the longitudinal centerline of the absorber are both is the rear sealing angle, the front sealing angle and the rear sealing angle are 30-60°, in this embodiment the front sealing angle is 45°, and the rear sealing angle is 30°;

(8) Slit the product along the edge connecting the sealing position to obtain a single piece of briefs-style sanitary napkin;

(9) Folding and packaging.

In the briefs-type sanitary napkin of the present invention, the opening ring structure around the legs is different from the traditional O-ring. By cutting out the opening rings around the legs, front and back pieces of different sizes are obtained, and the sanitary napkin as a whole appears as a brief. type structure, the leg opening circle is surrounded by leg elastic material. The leg elastic material can be elastic spandex or elastic film or elastic non-woven fabric. The lateral width of the back piece is greater than the lateral width of the front piece, so that the welding points on both sides are distributed It is closer to the triangle area than the waist area, so there will be no foreign body sensation when using it, especially when lying on the side, it is more comfortable. The elastic material layer of the leg opening ring may be arranged along the entire circumference of the leg opening ring, or may be arranged only on the corresponding left and right edges of the leg opening ring.

Although the invention has been specifically shown and described in conjunction with preferred embodiments, it will be apparent to those skilled in the art that the invention can be modified in form and detail without departing from the spirit and scope of the invention as defined by the appended claims. Various changes are made within the scope of the present invention.

Claims (4)

1. A method for preparing a briefs-type sanitary towel, which is characterized by comprising the following preparation steps:

(1) Preparing an absorber: a. mixing fluff pulp, high molecular water-absorbing resin and long fibers, and feeding into a mould wheel for forming; b. attaching a wrapping layer to obtain an absorption core layer; c. on-line compounding of the liquid-permeable surface layer and the liquid-impermeable bottom layer to obtain a continuously-transmitted absorber;

(2) Preparing a left waistline layer and a right waistline layer: the left waistline layer is provided with a left piece and a left piece which are sequentially connected along the transverse direction, and the right waistline layer is provided with a right piece and a right piece which are sequentially connected along the transverse direction;

the preparation process of the left piece and the left two pieces comprises the following steps: the method comprises the steps of sequentially carrying out online transmission and compounding on a first non-woven fabric, a first elastic material layer and a second non-woven fabric to obtain a first composite article with a three-layer structure, wherein the first composite article is divided into a left first area and a left second area which are integrally connected, a boundary line between the left first area and the left second area is defined as a left pre-turning line, a part of the left first area of the first composite article is defined as a left piece, and the left second area of the first composite article is defined as a left piece;

the preparation process of the right piece and the right two pieces comprises the following steps: the third non-woven fabric, the second elastic material layer and the fourth non-woven fabric are sequentially and online transmitted and compounded to obtain a second composite article with a three-layer structure, the second composite article is divided into a first right area and a second right area which are integrally connected, a boundary line between the first right area and the second right area is defined as a right pre-turning fold line, a part of the first right area of the second composite article is defined as a right piece, and a part of the second right two area of the second composite article is defined as a right two piece;

(3) Respectively inwards turning over the left sheet and the right sheet to obtain a left sheet and a right sheet with waistline reinforcing structures;

(4) Fixing the right ends of the left two sheets and the left ends of the right two sheets prepared in the step (2) on the two longitudinal side edges of the absorber along one longitudinal side respectively;

(5) Cutting leg opening rings into the left waistline layer and the right waistline layer;

(6) Turning the left piece and the right piece for 180 degrees along the left pre-turning fold line and the right pre-turning fold line respectively;

(7) The upper side and the lower side of the left piece are in sealing connection with the left end of the absorber, the upper side and the lower side of the right piece are in sealing connection with the right end of the absorber, a left front connecting part, a left rear connecting part, a right front connecting part and a right rear connecting part are formed after sealing, the angles formed by the left front connecting part and the right front connecting part and the longitudinal center line of the absorber are defined to be front sealing angles, the angles formed by the left rear connecting part and the right rear connecting part and the longitudinal center line of the absorber are respectively rear sealing angles, and the front sealing angles and the rear sealing angles are 30-60 degrees;

(8) Cutting the product along the edge of the connecting and sealing position to obtain a single briefs type sanitary towel;

(9) Folding and packaging.

2. The method for producing a panty sanitary napkin according to claim 1, wherein: steps (7) and (8) can also be realized in one step by sealing and cutting an integrated knife roll.

3. The method for producing a panty sanitary napkin according to claim 1, wherein: the first elastic material layer comprises a waistline elastic material layer and a leg surrounding elastic material layer arranged along the position of the leg surrounding opening ring, the second elastic material layer comprises a waistline elastic material layer and a leg surrounding elastic material layer arranged along the position of the leg surrounding opening ring, the first elastic material layer distributed in the left area and the right area comprises a waistline elastic material layer and a leg surrounding elastic material layer, the first elastic material layer distributed in the left area and the right area is an elastic non-woven fabric or an elastic film, the second elastic material layer in the right area is an elastic non-woven fabric or an elastic film, the waistline elastic material layer is elastic spandex filaments, and the leg surrounding elastic material layer is elastic spandex filaments or elastic non-woven fabric or an elastic film.

4. The method for producing a panty sanitary napkin according to claim 1, wherein: the fixing mode in the step (4) is ultrasonic compounding or glue compounding.