A method for preparing an ergonomic triangle-shaped sanitary napkin

Abstract

This invention relates to the field of sanitary products and provides a method for preparing an ergonomic triangle-style sanitary napkin, which solves the problem that existing sanitary napkins are prone to "leg binding" and poor wrapping performance due to structural design defects. The method includes an absorbent body and an outer garment layer disposed outside the absorbent body. The absorbent body is defined to have a longitudinal direction along the length direction and a transverse direction along the width direction. The outer garment layer is divided into a front piece and a back piece with the narrowest line of the crotch as the dividing line. The transverse width of the back piece is greater than that of the front piece. The front piece and the back piece are fixedly welded on their transverse sides to form a left sealing line and a right sealing line. The transverse distance between the left sealing line and the right sealing line and the most anterior protrusion of the human hip bone is 5-50mm. The longitudinal length of the back piece is greater than that of the front piece.

Description

[0001] This application is a divisional application of patent application number 2022109620837, filed on August 11, 2022, entitled "An Ergonomic Triangle Panty-Style Sanitary Napkin and Its Preparation Method". Technical Field

[0002] This invention relates to the field of hygiene products, and more particularly to a method for preparing an ergonomic triangular panty-style sanitary napkin. Background Technology

[0003] Menstrual panty-style sanitary napkins generally consist of an absorbent core layer and an outer layer. The absorbent core layer includes a liquid-permeable top layer, an absorbent core, and a liquid-impermeable bottom layer, stacked sequentially from top to bottom. The outer layer includes an outer outer layer, a spandex elastic material layer, and an inner outer layer, stacked sequentially from the outside to the inside. The outer layer is divided into a front and back piece, with the narrowest point (narrowest point of the O-ring) as the boundary. Both the front and back pieces have corresponding left and right ends.

[0004] When the human body is active (walking, squatting, lifting legs, etc.), the legs move forward and upward, which mainly exerts 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 should be as close to the thigh as possible without pinching the leg, and the back should cover as much as possible with elasticity". The design should cover the triangle area in the front but not beyond the leg lifting line in the triangle area so as not to affect daily activities such as lifting the leg and walking. The back should cover the buttocks as much as possible to the buttock smile line to reduce the displacement of the absorbent material and the problems of side and back leakage.

[0005] refer to Figure 1 The existing pant-style sanitary napkins have the same width in the front and back pieces. When the front and back pieces are sealed together, the sealing line 1' is located at the back of the left and right sides of the body. When a person moves, the front piece is pulled to the back position, which restricts movement and is commonly known as "leg trapping". The back piece is unable to wrap forward and has insufficient tension, resulting in poor overall wrapping performance. Summary of the Invention

[0006] Therefore, in view of the above problems, the present invention provides a method for preparing an ergonomic triangle-style sanitary napkin, which solves the problem that existing sanitary napkins are prone to "trapping the legs" and poor wrapping performance due to defects in structural design.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an ergonomic triangular panty-style sanitary napkin, comprising an absorbent body and an outer garment layer disposed outside the absorbent body. The absorbent body is defined to have a longitudinal direction along the length direction and a transverse direction along the width direction. The outer garment layer is divided into a front piece and a back piece by the narrowest line of the crotch area. The transverse width of the back piece is greater than that of the front piece. The front piece and the back piece are fixedly welded on their transverse sides to form a left sealing line and a right sealing line. The transverse distance between the left sealing line and the right sealing line and the most anterior protruding point of the human hip bone is 5-50mm. The longitudinal length of the back piece is greater than that of the front piece. The outer garment layer has a leg elastic material layer disposed at the left and right leg circumferences, and the width of the leg elastic material layer is ≥3mm.

[0008] Furthermore, the absorbent contains long fibers, which are cotton fibers, fluff pulp fibers, viscose fibers, or ES fibers.

[0009] Furthermore: when worn, the angle at which the back piece wraps around the human body is greater than 195°.

[0010] Furthermore, the longitudinal dimension of the rear piece is more than 10% larger than the longitudinal dimension of the front piece.

[0011] Furthermore, the absorbent is composed of a mixture of fluff pulp, superabsorbent polymer, and long fibers.

[0012] Furthermore, the weight ratio of the fluff pulp, superabsorbent polymer, and long fibers is 10:1-3:0.5-2.

[0013] Furthermore, the outer nonwoven fabric is provided with a patterned printing layer.

[0014] Furthermore: the leg circumference elastic material layer consists of two sets of elastic materials, namely a first set of elastic materials and a second set of elastic materials. The first set of elastic materials extends from the upper left region of the front piece to the middle left region, then to the middle right region, and finally to the upper right region. The second set of elastic materials extends from the lower left region of the rear piece to the middle left region, then to the middle right region, and finally to the lower right region. Alternatively, the first set of elastic materials extends from the upper left region of the front piece to the middle left region, then to the middle right region, and finally to the lower right region of the rear piece. The second set of elastic materials extends from the upper right region of the front piece to the middle right region, then to the middle left region, and finally to the lower left region of the rear piece. Alternatively, the first set of elastic materials extends from the upper left region of the front piece to the middle left region, then to the middle left region of the rear piece, and finally to the lower left region of the rear piece. The second set of elastic materials extends from the upper right region of the front piece to the middle right region, then to the middle right region of the rear piece, and finally to the lower right region of the rear piece.

[0015] The leg circumference elastic material layer is any one or any combination of two or more of the following: elastic spandex yarn, elastic non-woven fabric, and elastic membrane.

[0016] A method for preparing an ergonomic triangular panty-style sanitary napkin includes the following preparation steps: (1) Preparation of the outer garment layer

[0017] s1. The outer non-woven fabric is transported online, and then the elastic spandex yarn and the leg elastic material layer are laminated online, followed by the inner non-woven fabric to obtain a composite outer garment layer. The leg elastic material layer is controlled by a baffle to control the transport direction, so that the leg elastic material layer is distributed in a specific shape between the outer and inner non-woven fabrics.

[0018] s2. Cutting out individual outer garment layers: Cutting along the longitudinal direction to obtain individual outer garment layers; each individual outer garment layer has a leg O-ring, a narrower front piece, and a wider back piece;

[0019] (2) Preparation of absorber

[0020] a. Long fiber finishing: The long fibers are opened by the opening machine, coarsely opened by the coarse opening machine, and combed into a single fiber state by the fine opening machine. They are then sent to the outlet of the wood pulp crusher by a metering fan to be mixed with fluff pulp and SAP.

[0021] b. The fluff pulp, superabsorbent polymer, and long fibers are mixed and fed into a mold wheel for molding;

[0022] c. Attach a coating layer to obtain the absorbent core layer;

[0023] d. Online composite layer of liquid-permeable top layer and liquid-impermeable bottom layer to obtain absorbent; cut to obtain individual absorbent;

[0024] (3) The individual absorber is transferred online, rotated 90°, and then transferred and composited onto the outer garment layer after being processed in step s2;

[0025] (4) The composite outer garment layer and absorbent layer enter the Ω folding and conveying device, so that the parts on the left and right sides of the back piece that are wider than the front piece are folded by Ω during the conveying process. After folding, the lateral width of the back piece is consistent with that of the front piece; or enter the speed ratio elimination and conveying device, and eliminate the inconsistency in the left and right widths of the front and back pieces by setting the speed difference between the conveying of the front and back pieces, so that the front and back pieces are aligned in the left and right positions.

[0026] Front sheet conveyor speed / Rear sheet conveyor speed = Rear sheet width / Front sheet width;

[0027] (5) Define the outer garment layer as having a Z-shaped fold line, the Z-shaped fold line coincides with or is very close to the narrowest line of the crotch, and pre-fold a portion of the capacity space of the back piece of the outer garment layer inside the back piece along the Z-shaped fold line;

[0028] (6) Fold the back piece 180° and align it with the front piece in the front and back positions. Weld the two sides laterally to fix it, and you will get an ergonomic triangular panty-style sanitary napkin.

[0029] Furthermore: the shape of the leg circumference elastic material layer is U-shaped, X-shaped, or two half-O-shaped parts.

[0030] Further: In step (4), the folding method of the back piece is a Z-shaped fold.

[0031] By adopting the aforementioned technical solution, the beneficial effects of the present invention are as follows:

[0032] 1. The rear piece of the present invention has a lateral width greater than that of the front piece. The front piece and the rear piece are fixedly welded on both sides to form a left sealing line and a right sealing line. The lateral distance between the left sealing line and the right sealing line and the most prominent point of the human hip bone is 5-50mm. The sealing line is not on the left or right sides of the human body. When using it while lying on the side, it will not hit the side of the human waist and there will be no foreign body sensation, making it more comfortable to use.

[0033] 2. The longitudinal length of the back piece is greater than that of the front piece. Since the thickness of the buttocks is significantly greater than that of the front triangle area, the back piece of the panty-style sanitary napkin is longer than the front piece, which allows the back piece to have more space.

[0034] 3. The addition of long fibers to the absorbent increases the liquid absorption diffusion rate and diffusion length, while reducing the risk of absorbent fracture.

[0035] 4. In traditional pant-style sanitary napkins, when the front and back pieces are of equal width, the wrapping angle of the back piece on the body is less than 180° when the waist circumference is 360°. In contrast, the sanitary napkin of this invention has a wrapping angle of ≥195° when the back piece is worn.

[0036] 5. The increased width of the back panel, extending to the front of the body when worn, combined with the elastic material layer in the legs, allows the back panel of this panty-style sanitary napkin to naturally tighten and lift, partially lifting off the horizontal plane when placed naturally. This realistically simulates the human body shape, making it more comfortable to wear and providing better coverage for the legs and buttocks, while also increasing leak prevention.

[0037] 6. Further: The waist area is formed by folding and fixing the top of the front and back pieces twice, making the waist area thicker, more elastic, and more stable.

[0038] 7. Furthermore, it also includes a leg-circle elastic material layer disposed at the left and right leg circumferences. The leg-circle elastic material layer consists of two sets of elastic materials: a first set of elastic material and a second set of elastic material. The first set of elastic material extends from the upper left region of the front piece to the middle left region, then to the middle right region, and finally to the upper right region. The second set of elastic material extends from the lower left region of the rear piece to the middle left region, then to the middle right region, and finally to the lower right region. Alternatively, the first set of elastic material extends along the upper left region of the front piece to the middle left region, then to the middle right region, and finally to the lower right region of the rear piece. The second set of elastic material... The first elastic material extends from the upper right region of the front piece to the middle right region, then to the middle left region, and finally to the lower left region of the back piece; or, the first elastic material extends from the upper left region of the front piece to the middle left region, then to the middle left region of the back piece, and finally to the lower left region of the back piece, while the second elastic material layer extends from the upper right region of the front piece to the middle right region, then to the middle right region of the back piece, and finally to the lower right region of the back piece. By adopting the above three structural designs, the back piece can be tightened and lifted, so that the triangular panty-style sanitary napkin of the present invention naturally stands up after being placed, and the leg circumference is better wrapped when worn, resulting in a better leak-proof effect. Attached Figure Description

[0039] Figure 1 This is a front view of the product in the background art of this invention;

[0040] Figure 2 This is a front view of the product according to Embodiment 1 of the present invention;

[0041] Figure 3 This is a schematic diagram of the unfolded structure of the product according to Embodiment 1 of the present invention;

[0042] Figure 4 This is a schematic diagram of the unfolded structure of the product of Embodiment 2 of the present invention;

[0043] Figure 5 This is a schematic diagram of the unfolded structure of the product of Embodiment 3 of the present invention;

[0044] Figure 6 This is a schematic diagram of the Z-shaped folding of the rear piece in Embodiment 1 of the present invention;

[0045] Figure 7 This is a schematic diagram of the connection structure between the front and rear pieces after folding in Embodiment 1 of the present invention;

[0046] Figure 8 This is a schematic diagram of the Ω-folding and conveying of the front and rear sheets in Embodiment 1 of the present invention;

[0047] Figure 9 This is a three-dimensional structural diagram of the product in Embodiment 1 of the present invention;

[0048] Figure 10This is a schematic diagram of the production process in Embodiment 1 of the present invention. Detailed Implementation

[0049] The embodiments of the present invention are as follows:

[0050] refer to Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 An ergonomic, medium-sized triangle-style sanitary napkin includes an absorbent body 1 and an outer garment layer disposed outside the absorbent body. The absorbent body 1 is defined to have a longitudinal direction along its length and a transverse direction along its width. The outer garment layer is divided into a front piece a and a back piece b, with the narrowest line c at the crotch as the dividing line. The transverse width of the back piece b is greater than that of the front piece a. The front piece a and the back piece b are fixedly welded on their transverse sides to form a left sealing line 2 and a right sealing line 3. The transverse distance between the left sealing line and the right sealing line and the most anterior protrusion of the human hip bone is 25mm. The longitudinal length of the back piece b is 10% longer than that of the front piece a. Long fibers, specifically ES fibers, are added to the absorbent body 1. The absorbent body is composed of a non-woven fabric wrapping an absorbent core, which is composed of fluff pulp, superabsorbent polymer, and long fibers mixed in a weight ratio of 10:1:1.5. The outer non-woven fabric of both the front and back pieces is printed with a pattern layer, which is used for product online positioning.

[0051] It also includes a leg circumference elastic material layer disposed on the left and right leg circumferences. The leg circumference elastic material layer 4 is composed of two sets of elastic materials, namely a first set of elastic materials 41 and a second set of elastic materials 42. The first set of elastic materials 41 extends from the upper left region of the front piece to the middle left region, then to the middle left region of the rear piece, and finally to the lower left region of the rear piece. The second set of elastic materials 42 extends from the upper right region of the front piece to the middle right region, then to the middle right region of the rear piece, and finally to the lower right region of the rear piece.

[0052] Specifically, when unfolded, this menstrual sanitary napkin has a waist circumference of 625mm on both sides, an absorbent core length of 630mm, and an absorbent wick length of 475mm. The waistband is folded twice, with an overlap width of 20mm. The waistband's elastic spandex material has a stretch ratio of 2.5; the waistband's elastic non-woven fabric has a stretch ratio of 2.0. When worn, the side seam is approximately 20mm from the most prominent point of the hip bone.

[0053] The above-mentioned method for preparing an ergonomic triangular panty-style sanitary napkin includes the following preparation steps:

[0054] (1) Preparation of outer garment layer

[0055] s1. The outer non-woven fabric is transported online, and then the elastic spandex yarn and the leg elastic material layer are laminated online, followed by the inner non-woven fabric to obtain a composite outer garment layer. The leg elastic material layer is controlled by a baffle to control the transport direction, so that the leg elastic material layer is distributed in a specific shape between the outer and inner non-woven fabrics.

[0056] s2. Cutting out individual outer garment layers: Cutting along the longitudinal direction to obtain individual outer garment layers; each individual outer garment layer has a leg O-ring, a narrower front piece, and a wider back piece;

[0057] (2) Preparation of absorber

[0058] a. Long fiber finishing: The long fibers are opened by the opening machine, coarsely opened by the coarse opening machine, and combed into a single fiber state by the fine opening machine. They are then sent to the outlet of the wood pulp crusher by a metering fan to be mixed with fluff pulp and SAP.

[0059] b. The fluff pulp, superabsorbent polymer, and long fibers are mixed and fed into a mold wheel for molding;

[0060] c. Attach a coating layer to obtain the absorbent core layer;

[0061] d. Online composite layer of liquid-permeable top layer and liquid-impermeable bottom layer to obtain absorbent; cut to obtain individual absorbent;

[0062] (3) The individual absorber is transferred online, rotated 90°, and then transferred and composited onto the outer garment layer after being processed in step s2;

[0063] (4) The composite outer garment layer and absorbent layer enter the Ω folding and conveying device, so that the parts on the left and right sides of the back piece that are wider than the front piece are folded by Ω during the conveying process. After folding, the lateral width of the back piece is consistent with that of the front piece.

[0064] (5) Define the outer garment layer as having a Z-shaped fold line, the Z-shaped fold line coincides with or is very close to the narrowest line of the crotch, and pre-fold a portion of the capacity space of the back piece of the outer garment layer inside the back piece along the Z-shaped fold line;

[0065] (6) Fold the back piece 180° and align it with the front piece in the front and back positions. Weld the two sides laterally to fix it, and you will get an ergonomic triangular panty-style sanitary napkin.

[0066] The aforementioned leg circumference elastic material layer has a C-shaped structure that is symmetrical from left to right. That is, the leg circumference elastic material layer 4 is composed of two sets of elastic materials, namely the first set of elastic materials 41 and the second set of elastic materials 42. The first set of elastic materials 41 extends from the upper left region of the front piece to the middle left region, then to the middle left region of the back piece, and finally to the lower left region of the back piece. The second set of elastic materials 42 extends from the upper right region of the front piece to the middle right region, then to the middle right region of the back piece, and finally to the lower right region of the back piece.

[0067] Example 2

[0068] refer to Figure 4 Compared with Embodiment 1, the difference is that the elastic material layer of the leg circumference in this embodiment is composed of a first group of elastic materials 41' and a second group of elastic materials 42'. The first group of elastic materials 41' extends from the upper left region of the front piece to the middle left region, then to the middle right region, and finally to the lower right region of the back piece. The second group of elastic materials 42' extends from the upper right region of the front piece to the middle right region, then to the middle left region, and finally to the lower left region of the back piece.

[0069] In this embodiment, the outer garment layer and absorbent body after step (4) enter the speed ratio elimination and conveying device. The inconsistency in the left and right widths of the front and rear pieces is eliminated by setting the speed difference between the front and rear pieces, so that the front and rear pieces are aligned in the left and right positions. The speed ratio formula is: front piece conveying speed / rear piece conveying speed = rear piece width / front piece width. This method replaces the Ω fold in embodiment one to achieve the same purpose.

[0070] Example 3

[0071] refer to Figure 5 Compared with Embodiment 1, the difference is that the elastic material layer of the leg circumference set at the left and right leg circumferences in this embodiment is composed of a first group of elastic materials 41a and a second group of elastic materials 42b. The first group of elastic materials 41a extends from the upper left region of the front piece to the middle left region, then to the middle right region, and finally to the upper right region. The second group of elastic materials 42b extends from the lower left region of the back piece to the middle left region, then to the middle right region, and finally to the lower right region.

[0072] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A method of manufacturing an ergonomic panty-shape sanitary napkin, characterized by, The preparation steps include the following: (1) preparation of the outer clothing layer s1, the outer layer non-woven fabric is transmitted online, the elastic spandex filament and the leg elastic material layer are compounded, the inner layer non-woven fabric is compounded again, and the outer clothing layer compounded into one body is obtained; the leg elastic material layer is controlled in the transmission direction by the baffle, so that the leg elastic material layer is distributed in a specific shape between the outer layer non-woven fabric and the inner layer non-woven fabric; s2, cutting out a single outer clothing layer: cutting in the longitudinal direction to obtain a single outer clothing layer; the single outer clothing layer has a leg O-shaped ring, a relatively narrow front piece and a relatively wide back piece; (2) preparation of the absorbent body a, long fiber arrangement: the long fibers are unpacked by an unpacking machine, coarsely opened by a coarse opening machine, combed to a single fiber state by a fine opening machine, and sent to the outlet of a wood pulp crusher for mixing with fluff pulp and SAP by a quantitative air blower; b, the fluff pulp, the high molecular water-absorbing resin and the long fibers are mixed and sent to a die wheel to form a shaped body; c, a wrapping layer is attached to the shaped body to obtain an absorbent core layer; d, the absorbent core layer is compounded between the liquid-permeable surface layer and the liquid-impermeable bottom layer to obtain the absorbent body; cutting obtains a single absorbent body; (3) the single absorbent body is transmitted online, turned over 90°, and then compounded to the outer clothing layer processed in step s2; (4) the compounded outer clothing layer and the absorbent body layer enter the Ω folding and conveying device, so that the back piece is folded in the Ω shape on the left and right sides of the wider part than the front piece in the conveying process, and the transverse width of the back piece after folding is consistent with that of the front piece; (5) the outer clothing layer has a Z-shaped folding line, the Z-shaped folding line coincides with or is very close to the narrowest line of the crotch part, and a part of the capacity space of the back piece of the outer clothing layer is pre-folded inside the back piece along the Z-shaped folding line; (6) the back piece is folded by 180° and compounded with the front piece in the front and back positions, and the transverse sides are welded and fixed, so as to obtain the sanitary napkin in the form of the ergonomic briefs.

2. The method for preparing an ergonomic triangle-style sanitary napkin according to claim 1, characterized in that: The leg elastic material layer has a U-shaped or X-shaped or left and right two half O-shaped shape.

3. The method for preparing an ergonomic triangle-style sanitary napkin according to claim 1, characterized in that: The folding mode of the back piece in step (4) is Z-shaped folding.

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