Process for manufacturing an ultra-thin sanitary napkin

Abstract

The present application relates to the technical field of disposable sanitary product manufacturing, and particularly relates to a preparation process of an extremely thin sanitary napkin, comprising the following steps: a, preparing a composite absorbent core material, comprising the following sub-steps: a1, conveying a first fixed layer material; a2, conveying a second fixed layer material, and applying ES fiber and high molecular water-absorbing resin on the second fixed layer; a3, pressing the first fixed layer and the second fixed layer to form the composite absorbent core material; controlling the adding amount of the ES fiber and the high molecular water-absorbing resin to prepare a wrapping layer and a convex absorbing layer respectively; b, arranging a plurality of flow guide through holes on the convex absorbing layer; c, preparing an absorbent core layer, wrapping the convex absorbing layer with the wrapping layer, and cutting to form the absorbent core layer; d, stacking a surface layer, the absorbent core layer and a liquid-impermeable bottom layer to form a sanitary napkin body; e, processing the sanitary napkin body through cutting, folding and packaging to prepare an extremely thin sanitary napkin product. The extremely thin sanitary napkin prepared by the process is light and thin, and has good water-absorbing property and comfort.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene product manufacturing technology, and in particular to a process for preparing ultra-thin sanitary napkins. Background Technology

[0002] Sanitary napkins are hygiene products used by women during menstruation, mainly consisting of three layers from the inside out: the top layer, the absorbent core, and the bottom layer. As people's living standards continue to improve, women's demand for sanitary napkins is also gradually increasing. Traditional sanitary napkin absorbent cores are usually made of expanded paper and composite absorbent paper, which have a higher basis weight and thicker materials, resulting in poor comfort and a less than ideal user experience. Furthermore, traditional absorbent cores have poor liquid diffusion properties, leading to low utilization rates. Summary of the Invention

[0003] Therefore, in response to the aforementioned problems, this invention proposes a process for preparing ultra-thin sanitary napkins. The ultra-thin sanitary napkins prepared by this process are lightweight, thin, and have good absorbency and comfort.

[0004] To achieve the aforementioned objective, the present invention employs the following technical solution:

[0005] A process for manufacturing ultra-thin sanitary napkins includes the following steps:

[0006] a. Preparation of composite absorbent core material, including the following sub-steps:

[0007] a1. The material conveying of the first fixed layer is provided with a first ultrasonic humidifier and a first wrinkling roller in sequence along the conveying direction of the first fixed layer. The first ultrasonic humidifier sprays and humidifies the lower surface of the first fixed layer, and then the first wrinkling roller achieves wrinkling and shaping of the surface of the first fixed layer.

[0008] a2. The material conveying of the second fixed layer includes a second ultrasonic humidifier, a second crease roller, an ES fiber adding device, and a superabsorbent polymer adding device, arranged sequentially along the conveying direction of the second fixed layer. The second ultrasonic humidifier sprays and humidifies the upper surface of the second fixed layer, and the second crease roller then creases and shapes the surface of the second fixed layer. ES fibers are then applied to the upper surface of the second fixed layer through the ES fiber adding device, and superabsorbent polymer is applied to the upper surface of the second fixed layer through the superabsorbent polymer adding device.

[0009] The density of the ES fiber is 5-30 g / m², and the density of the superabsorbent resin is 30-100 g / m².

[0010] a3. Press the first and second fixed layers together with a pressing roller, and then dry them in a second oven. Control the moisture content of the first fixed layer, the second fixed layer, and the ES fiber and superabsorbent polymer set on the second fixed layer to form a composite absorbent core material.

[0011] Both the first and second fixing layers are made of wet-strength paper; the sub-steps a1 and a2 are not in any particular order;

[0012] The density of the composite absorbent core material was adjusted by controlling the amount of ES fiber and superabsorbent polymer added.

[0013] When the density of the composite absorbent core material is 50-120 g / m², it is used to prepare the coating layer;

[0014] When the density of the composite absorber core material is 100-200 g / m², it is used to prepare the convex absorber layer;

[0015] Furthermore, the density of the convex absorption layer is greater than the density of the encapsulation layer;

[0016] b. Several flow-guiding holes are formed on the convex absorption layer by needle punching equipment, and each flow-guiding hole penetrates the convex absorption layer from top to bottom.

[0017] c. Prepare the absorbent core layer by wrapping the middle part of the wrapping layer over the convex absorbent layer, and folding the left and right sides of the wrapping layer downwards to wrap under the convex absorbent layer. Then, cut the wrapping layer to form the absorbent core layer.

[0018] d. Prepare the top layer and the liquid-impermeable bottom layer, and stack the top layer, absorbent core layer and liquid-impermeable bottom layer from top to bottom to form the sanitary napkin body;

[0019] e. The sanitary napkin body is cut, folded, and packaged to produce an ultra-thin sanitary napkin product.

[0020] Furthermore, the guide hole is elongated.

[0021] The guide holes are arranged in a triangular pattern along the length of the sanitary napkin body.

[0022] Furthermore, in sub-step a2, a first drying oven is also provided between the ES fiber adding device and the superabsorbent polymer adding device;

[0023] The second fixing layer is initially dried in the first drying oven to control the moisture content of the second fixing layer and the ES fiber and superabsorbent polymer set on the second fixing layer.

[0024] Furthermore, the surface layer is provided with annular grooves and arc-shaped grooves;

[0025] The annular groove is located around the absorber core layer, and the center of the arc-shaped groove is located directly above the convex absorber layer.

[0026] Furthermore, the density of the wet-strength paper is between 13-25 g / m².

[0027] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0028] The ultra-thin sanitary napkins manufactured using this process feature a unique composite absorbent core material structure. The convex absorbent layer incorporates drainage holes, allowing liquid to quickly seep down, effectively increasing its absorption speed and improving the napkin's breathability. Furthermore, the density of the convex absorbent layer is greater than that of the sheath layer, resulting in a higher absorbency rate for the convex layer compared to the sheath layer. This ensures that menstrual blood is quickly absorbed by the convex absorbent layer and less likely to seep back onto the napkin surface.

[0029] Furthermore, the annular grooves on the surface layer act as flow-blocking and leak-proof features, effectively preventing menstrual blood from leaking to the side, front, or back. The arc-shaped grooves allow menstrual blood on the surface of the sanitary napkin to spread quickly along the arc-shaped grooves and penetrate downwards, effectively improving the utilization rate of the convex absorbent layer and ensuring that the surface of the sanitary napkin is dry and comfortable. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the composite absorber core material preparation equipment of the present invention.

[0031] Figure 2 This is a plan view of the ultra-thin sanitary napkin prepared by the present invention.

[0032] Figure 3 yes Figure 2 AA sectional view.

[0033] Figure 4 This is a schematic diagram of the composite absorber core material. Detailed Implementation

[0034] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0035] refer to Figures 1-4 This embodiment provides a process for manufacturing ultra-thin sanitary napkins, including the following steps:

[0036] a. Preparation of composite absorbent core material, including the following sub-steps:

[0037] a1. Material conveying of the first fixed layer 51: A first ultrasonic humidifier 101 and a first crease roller 102 are sequentially arranged along the conveying direction of the first fixed layer 51. Both the first ultrasonic humidifier 101 and the first crease roller 102 are existing devices in the art and will not be described in detail here. The first ultrasonic humidifier 101 sprays moisture onto the lower surface of the first fixed layer 51, which increases the moisture content of the first fixed layer 51, making the first fixed layer 51 more resilient and preventing it from breaking during processing. It also reduces the dust generated during the processing of the first fixed layer 51. The first crease roller 102 then creases and shapes the surface of the first fixed layer 51, creating an uneven texture that effectively locks in the ES fibers and superabsorbent polymer.

[0038] a2. Material conveying of the second fixed layer 53: Along the conveying direction of the second fixed layer 53, a second ultrasonic humidifier 201, a second crease roller 202, an ES fiber adding device 203, a first drying oven 204, and a superabsorbent polymer adding device 205 are sequentially arranged. The second ultrasonic humidifier 201 sprays moisture onto the lower surface of the second fixed layer 53, increasing its moisture content and improving its toughness, preventing breakage during processing. It also reduces dust generation during processing. The second ultrasonic humidifier 201 further humidifies the lower surface of the second fixed layer 53. The upper surface of the second fixed layer 53 is sprayed with moisture; then the second crease roller 202 is used to crease and shape the surface of the second fixed layer 53, so that the surface of the second fixed layer 53 forms an uneven texture, which can effectively lock in the ES fiber and superabsorbent polymer; then the ES fiber is applied to the upper surface of the second fixed layer by the ES fiber adding device 203, and the second fixed layer 201 is pre-dried by the first drying oven 204 to control the moisture content of the second fixed layer 53 and the ES fiber set on the second fixed layer 53, and the superabsorbent polymer is applied to the upper surface of the second fixed layer 53 by the superabsorbent polymer adding device 205.

[0039] The density of the ES fiber is 5-30 g / m², and the density of the superabsorbent resin is 30-100 g / m².

[0040] a3. The first fixing layer 51 and the second fixing layer 53 are pressed together by the pressing roller 207, and then dried by the second drying oven 208. The moisture content of the first fixing layer 51, the second fixing layer 53, and the ES fiber and superabsorbent polymer set on the second fixing layer 53 are controlled to form a composite absorbent core material.

[0041] Both the first fixing layer 51 and the second fixing layer 53 are made of wet-strength paper with a density of 13-25 g / m².

[0042] The sub-steps a1 and a2 are not in any particular order.

[0043] The density of the composite absorbent core material was adjusted by controlling the amount of ES fiber and superabsorbent polymer added.

[0044] When the density of the composite absorbent core material is 50-120 g / m², it is used to prepare the coating layer 31.

[0045] When the density of the composite absorber core material is 100-200 g / m², it is used to prepare the convex absorber layer 32.

[0046] Furthermore, the density of the convex absorption layer 32 is greater than the density of the encapsulation layer 31.

[0047] b. A plurality of guide holes 33 are formed on the convex absorbent layer 32 by needle punching with a needle punching device (not shown in the figure), and each guide hole 33 penetrates the convex absorbent layer 32 vertically. Preferably, the guide holes 33 are elongated strips; each guide hole 33 is arranged in a triangular pattern along the length direction of the sanitary napkin body 1.

[0048] c. Prepare the absorption core layer 3 by placing the middle part of the wrapping layer 31 above the convex absorption layer 32, and folding the left and right sides of the wrapping layer 31 downwards to cover the lower part of the convex absorption layer 32, and then cutting it to form the absorption core layer 3.

[0049] d. Prepare the top layer 2 and the liquid-impermeable bottom layer 4, and stack the top layer 2, the absorbent core layer 3 and the liquid-impermeable bottom layer 4 from top to bottom to form the sanitary napkin body 1.

[0050] e. The sanitary napkin body 1 is cut, folded, and packaged to produce an ultra-thin sanitary napkin product.

[0051] Preferably, the surface layer 2 prepared in step d is provided with an annular groove 21 and an arc-shaped groove 22; the annular groove 21 is located around the absorber core layer 3, and the center of the arc-shaped groove 22 is located directly above the convex absorber layer 32.

[0052] The ultra-thin sanitary napkin prepared by this ultra-thin sanitary napkin manufacturing process includes a sanitary napkin body 1, which comprises a surface layer 2, an absorbent core layer 3, and a liquid-impermeable bottom layer 4 arranged sequentially from top to bottom. The surface layer 2 is a non-woven fabric layer, and the liquid-impermeable bottom layer 4 is a PE bottom film. The PE bottom film has good waterproof and breathable properties, which can prevent menstrual blood from leaking out from the bottom of the sanitary napkin.

[0053] The absorbent core layer 3 includes a wrapping layer 31 and a convex absorbent layer 32. The center of the wrapping layer 31 is located above the convex absorbent layer 32, and the left and right sides of the wrapping layer 31 are folded down to cover the lower part of the convex absorbent layer 32. The convex absorbent layer 32 is located in the middle of the sanitary napkin body 1, corresponding to the area where menstrual blood is excreted. The convex absorbent layer 32 is provided with a plurality of guide holes 33, and the guide holes 33 penetrate the convex absorbent layer 32 vertically. By setting the convex absorbent layer 32, the liquid absorption capacity of the absorbent core layer 3 is increased, enhancing the absorbency of the absorbent core layer 3, while making the sanitary napkin fit the curves of the female body better and absorb faster.

[0054] Both the wrapping layer 31 and the convex absorbent layer 32 are made of composite absorbent core material, and the density of the convex absorbent layer 32 is greater than that of the wrapping layer 31. By setting the density of the convex absorbent layer 32 to be greater than that of the wrapping layer 31, the water absorption rate of the convex absorbent layer 32 is greater than that of the wrapping layer 31, making it easier for menstrual blood to quickly seep down and be absorbed by the convex absorbent layer 32, preventing it from seeping back onto the surface of the sanitary napkin.

[0055] The guide holes 33 are elongated and arranged in a triangular pattern along the length of the sanitary napkin body 1. The design of the guide holes 33 allows for rapid liquid penetration, effectively increasing the absorption speed of the convex absorbent layer 32, while also improving the breathability of the sanitary napkin and enhancing user comfort.

[0056] The composite absorbent core material comprises a first fixing layer 51, an absorbent core 52, and a second fixing layer 53 arranged sequentially from top to bottom. The first fixing layer 51 and the second fixing layer 53 are wet-strength paper, serving to fix the absorbent core 52. The absorbent core 52 is a uniform mixture of ES fiber and superabsorbent resin. The superabsorbent resin has strong water absorption capacity and good water retention performance. The ES fiber can improve the liquid diffusion performance of the composite absorbent core material, while effectively fixing the superabsorbent resin, ensuring the uniform distribution of the superabsorbent resin, and avoiding the problem of the absorbent core layer 3 becoming uneven after absorbing water. The density of the wet-strength paper is preferably 13-25 g / m², the density of the ES fiber is preferably 5-30 g / m², and the density of the superabsorbent resin is preferably 30-100 g / m². This composite absorbent core material is lightweight and thin, ensuring user comfort.

[0057] In this specific embodiment, the density of the wrapping layer 31 is 50-120 g / m², preferably 80 g / m².

[0058] In this specific embodiment, the density of the convex absorption layer 32 is 100-200 g / m², preferably 160 g / m².

[0059] The surface layer 2 is provided with an annular groove 21 and an arc-shaped groove 22. The annular groove 21 is located around the absorbent core layer 3, and the center of the arc-shaped groove 22 is located directly above the convex absorbent layer 32. The annular groove 21 serves to block flow and prevent leakage, effectively avoiding side leakage, front leakage, and back leakage of menstrual blood. The arc-shaped groove 22 allows menstrual blood on the surface of the sanitary napkin to quickly diffuse and penetrate downwards along the arc-shaped groove 22, effectively improving the utilization rate of the convex absorbent layer 32 and ensuring that the surface of the sanitary napkin is dry and comfortable.

[0060] This ultra-thin sanitary napkin effectively improves absorbency, reduces backflow, and ensures absorbency and comfort, making it highly practical.

[0061] 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 manufacturing process for ultra-thin sanitary napkins, characterized in that, Includes the following steps: a. Preparation of composite absorbent core material, including the following sub-steps: a1. The material conveying of the first fixed layer is provided with a first ultrasonic humidifier and a first wrinkling roller in sequence along the conveying direction of the first fixed layer. The first ultrasonic humidifier sprays and humidifies the lower surface of the first fixed layer, and then the first wrinkling roller achieves wrinkling and shaping of the surface of the first fixed layer. a2. The material conveying of the second fixed layer includes a second ultrasonic humidifier, a second crease roller, an ES fiber adding device, and a superabsorbent polymer adding device, arranged sequentially along the conveying direction of the second fixed layer. The second ultrasonic humidifier sprays and humidifies the upper surface of the second fixed layer, and the second crease roller then creases and shapes the surface of the second fixed layer. ES fibers are then applied to the upper surface of the second fixed layer through the ES fiber adding device, and superabsorbent polymer is applied to the upper surface of the second fixed layer through the superabsorbent polymer adding device. The density of the ES fiber is 5-30 g / m², and the density of the superabsorbent polymer is 30-100 g / m². a3. Press the first and second fixed layers together with a pressing roller, and then dry them in a second oven. Control the moisture content of the first fixed layer, the second fixed layer, and the ES fiber and superabsorbent polymer set on the second fixed layer to form a composite absorbent core material. Both the first and second fixing layers are made of wet-strength paper; the sub-steps a1 and a2 are not in any particular order; The density of the composite absorbent core material was adjusted by controlling the amount of ES fiber and superabsorbent polymer added. When the density of the composite absorbent core material is 50-120 g / m², it is used to prepare the coating layer; When the density of the composite absorber core material is 100-200 g / m², it is used to prepare the convex absorber layer; Furthermore, the density of the convex absorption layer is greater than the density of the encapsulation layer; b. Several flow-guiding holes are formed on the convex absorption layer by needle punching equipment, and each flow-guiding hole penetrates the convex absorption layer from top to bottom. c. Prepare the absorbent core layer by wrapping the middle part of the wrapping layer over the convex absorbent layer, and folding the left and right sides of the wrapping layer downwards to wrap under the convex absorbent layer. Then, cut the wrapping layer to form the absorbent core layer. d. Prepare the top layer and the liquid-impermeable bottom layer, and stack the top layer, absorbent core layer and liquid-impermeable bottom layer from top to bottom to form the sanitary napkin body; e. The sanitary napkin body is cut, folded, and packaged to produce an ultra-thin sanitary napkin product.

2. The manufacturing process for an ultra-thin sanitary napkin according to claim 1, characterized in that: The guide hole is elongated. The guide holes are arranged in a triangular pattern along the length of the sanitary napkin body.

3. The manufacturing process for an ultra-thin sanitary napkin according to claim 1, characterized in that: In sub-step a2, a first drying oven is also provided between the ES fiber adding device and the superabsorbent polymer adding device. The second fixing layer is initially dried in the first drying oven to control the moisture content of the second fixing layer and the ES fiber and superabsorbent polymer set on the second fixing layer.

4. The manufacturing process for an ultra-thin sanitary napkin according to claim 1, characterized in that: The surface layer is provided with annular grooves and arc grooves; The annular groove is located around the absorber core layer, and the center of the arc-shaped groove is located directly above the convex absorber layer.

5. The manufacturing process for an ultra-thin sanitary napkin according to claim 1, characterized in that: The density of the wet-strength paper is 13-25 g / m².

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