Preparation method of skin-friendly and soft sanitary napkin

Abstract

The present invention relates to the field of sanitary products, and provides a method for preparing a skin-friendly and soft sanitary napkin, which solves the defect of poor softness of the sanitary napkin in the prior art. The method comprises the following steps: preparing a liquid-permeable surface layer, preparing an absorbent body, preparing a liquid-impermeable bottom layer, and online compounding the liquid-permeable surface layer, the absorbent body and the liquid-impermeable bottom layer into one piece and cutting them into individual products. The preparation of the liquid-permeable surface layer comprises the following steps: (1) preparing raw materials; (2) preparing a soft foam body; (3) cutting the soft foam body; (4) transferring the cut soft foam body to the surface of the soft non-woven fabric, spraying or scraping hot melt adhesive in advance on the contact part between the soft non-woven fabric and the soft foam body, so that the cut soft foam body and the soft non-woven fabric are compounded into one piece, thus obtaining the liquid-permeable surface layer.

Description

Technical Field

[0001] The invention relates to the field of sanitary products, in particular to a method for preparing a skin-friendly and soft sanitary napkin. Background Art

[0002] The structure of existing sanitary napkins generally includes a liquid permeable surface layer, an absorbent body and a liquid impermeable bottom layer stacked in sequence from top to bottom. Common liquid permeable surface layers include pure cotton non-woven fabrics and hot air non-woven fabrics. Pure cotton non-woven fabrics are relatively soft but have poor dryness and are prone to dampness and stickiness. Hot air non-woven fabrics have good dryness but have a poor hand feel and a burr feeling.

[0003] Chinese patent publication number CN110236793A discloses a sanitary napkin with a non-woven perforated film composite surface layer, including a sanitary napkin body and wings on both sides. The top of the sanitary napkin body is the surface layer, which is composed of an upper hot air non-woven fabric layer and a lower PE perforated film layer. It pioneered the use of hot air non-woven fabric and PE perforated film to composite the two into a new double-layer material surface layer to replace the traditional surface layer. Since the hot air non-woven fabric layer is in direct contact with the human body, there is no potential safety risk. At the same time, it is soft and comfortable to the touch and has good moisture absorption and permeation conductivity. The inverted V-shaped holes or inverted W-shaped holes set on the PE perforated film layer can effectively prevent backseepage and keep the surface layer dry, but the softness of the surface layer of the sanitary napkin is relatively ordinary. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention provides a method for preparing a skin-friendly and soft sanitary napkin to solve the defect of poor softness of the sanitary napkin in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a method for preparing a skin-friendly and soft sanitary napkin, comprising preparing a liquid-permeable surface layer, preparing an absorbent body, preparing a liquid-impermeable bottom layer, and the process of online compounding the liquid-permeable surface layer, the absorbent body and the liquid-impermeable bottom layer into one body and cutting them into individual products, wherein the preparation of the liquid-permeable surface layer comprises the following steps:

[0006] (1) Preparation of raw materials: Pure cotton fiber and bicomponent fiber with skin-core structure are mixed evenly in a weight ratio of 1:2-1:3 as raw materials, and then sent to a web laying machine for cross-laying and drafting reinforcement to obtain a fiber web. The fiber web is then heated and rolled with a hot roller to obtain a soft non-woven fabric.

[0007] (2) Preparation of soft foam: using flexible foamable material and polyester polyol as main raw materials, adding a foaming agent, a catalyst and a stabilizer, and sending them into a mold for foaming treatment to obtain a soft foam, wherein the soft foam has a one-piece foam body, the bottom surface of the foam body is a flat structure, and the foam body has hemispherical structures evenly distributed at intervals;

[0008] (3) cutting the soft foam;

[0009] (4) The cut soft foam body is transferred to the surface of the soft non-woven fabric, and hot melt adhesive is sprayed or scraped on the contact portion between the soft non-woven fabric and the soft foam body in advance, so that the cut soft foam body and the soft non-woven fabric are composited into one, thereby obtaining a liquid-permeable surface layer.

[0010] Furthermore: the soft non-woven fabric has a front end, a middle part and a rear end which are sequentially connected along the length direction, and the soft foam body is distributed at the front end and the rear end of the soft non-woven fabric.

[0011] Furthermore: the area where the soft foam is distributed accounts for 1 / 5-2 / 5 of the total area of ​​the soft non-woven fabric.

[0012] Furthermore: the diameter of the hemispherical structure is 2-5 mm.

[0013] Furthermore: the soft foam is a polyurethane foam.

[0014] Furthermore: in step (1), the temperature of the hot rolling roller is controlled at 110-150°C.

[0015] Furthermore: the edges of the surface of the soft non-woven fabric are compounded with soft foam.

[0016] Furthermore, after step (4), a hydrophobic material layer is compounded on both lateral sides of the liquid-permeable surface layer.

[0017] Furthermore: the hydrophobic material layer is an improved soft foam, and the specific preparation process is: using the soft foam obtained by the above preparation as a substrate, and performing a hydrophobic modification treatment.

[0018] Further: the improved soft foam has a hemispherical convex structure which is continuously and evenly arranged at intervals.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are:

[0020] The skin-friendly and soft sanitary napkin obtained by the preparation method of the present invention has a liquid-permeable surface layer composed of a soft non-woven fabric and a soft foamed body arranged on a partial area of ​​the surface of the soft non-woven fabric. The soft non-woven fabric is prepared by mixing pure cotton fiber and ES fiber, and has both the skin-friendly breathability of pure cotton fabric and the dryness of ES fiber. At the same time, the soft foamed body is arranged at the front and rear ends of the soft non-woven fabric, which can not only increase the softness of the front and rear ends of the sanitary napkin, but also change the area in contact with the skin from a flat type to a hemispherical contact surface, thereby reducing the direct contact area with the skin and making it more comfortable to use.

[0021] Furthermore, the skin-friendly and soft sanitary napkin of the present invention has a hydrophobic material layer on both lateral sides of its liquid-permeable surface layer. The hydrophobic material layer is obtained by waterproofing a soft foam as a base material, that is, it has a hemispherical surface convex structure of the soft foam, retains the advantage of a smaller area in contact with the skin, and has the characteristic of better softness, and can prevent liquid from leaking from both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Is a schematic diagram of the structure of the liquid-permeable surface layer in Example 1 of the present invention;

[0023] Figure 2 Schematic diagram of the structure of the liquid-permeable surface layer in Example 2 of the present invention. DETAILED DESCRIPTION

[0024] Embodiment 1

[0025] A method for preparing a skin-friendly and soft sanitary napkin comprises the steps of preparing a liquid-permeable surface layer, preparing an absorbent body, preparing a liquid-impermeable bottom layer, and combining the liquid-permeable surface layer, the absorbent body and the liquid-impermeable bottom layer online into one body and cutting them into individual products. The preparation of the liquid-permeable surface layer comprises the following steps:

[0026] (1) Preparation of raw materials: Pure cotton fiber and bicomponent fiber with skin-core structure are used as raw materials in a weight ratio of 1:2, mixed evenly, opened, crushed and impurity-removed, and sent to a web laying machine for cross-laying and drafting reinforcement to obtain a fiber web, and then the fiber web is heated and rolled to shape using a hot roller to obtain a soft non-woven fabric; the temperature of the hot roller is controlled at 110°C, the skin material of the bicomponent fiber with skin-core structure is PE, which has a lower melting point, and the core material is PP, which has a higher melting point. When the temperature is heated to 110°C, PE melts, while PP has not yet melted. The two polymers are extruded through different spinning components and merged with each other on the spinning line to form a skin-core structure;

[0027] (2) Preparation of soft foam: using flexible foamable material and polyester polyol as main raw materials, adding a foaming agent, a catalyst and a stabilizer, and sending them into a mold for foaming treatment to obtain a soft foam, wherein the soft foam has a one-piece foam body, the bottom surface of the foam body is a flat structure, and the foam body has hemispherical structures evenly distributed at intervals; the diameter of the hemispherical structure is 2 mm;

[0028] (3) cutting the soft foam;

[0029] (4) The cut soft foam body is transferred and transported to the front and rear surfaces of the soft non-woven fabric, and hot melt adhesive is pre-sprayed or scraped on the contact portion between the soft non-woven fabric and the soft foam body, so that the cut soft foam body and the soft non-woven fabric are composited into one, that is, a liquid-permeable surface layer is obtained; the area where the soft foam body is distributed accounts for 1 / 5 of the total area of ​​the soft non-woven fabric.

[0030] The soft foam in step (2) is a polyurethane foam, and its specific preparation process is: polyester polyol, isocyanate, AC foaming agent, catalyst, and stabilizer are mixed in a weight ratio of 40:30:5:3:4, stirred evenly, and sent into a foaming mold for foaming treatment to obtain a polyurethane foam.

[0031] refer to Figure 1 The liquid-permeable surface layer obtained by the above preparation method comprises a soft nonwoven fabric 1 and a soft foam body 2 distributed on the front and rear end surfaces of the soft nonwoven fabric 1.

[0032] Embodiment 2

[0033] Referring to Example 1, the method for preparing a skin-friendly soft sanitary napkin of this embodiment is that the edges of the soft non-woven fabric surface are compounded with soft foam bodies. Specifically, when the soft foam body is cut in step (3), a die-cutting method is used to cut out a soft foam body that is consistent with the edge contour of the soft non-woven fabric. The width of the soft foam body is 2 cm, and then the two are compounded into one by gluing. Other technical solutions are the same as those of Example 1.

[0034] refer to Figure 2 The liquid-permeable surface layer of this embodiment includes a soft non-woven fabric 1 and a soft foam 3 arranged on the edge surface of the soft non-woven fabric 1. In addition, soft foams are also arranged on the front and rear end surfaces of the soft non-woven fabric 1.

[0035] Embodiment 3

[0036] Referring to Example 1, the preparation method of the skin-friendly and soft sanitary napkin of this embodiment, after step (4), a hydrophobic material layer is further compounded on both lateral sides of the liquid-permeable surface layer, and the hydrophobic material layer is an improved soft foam body. The specific preparation process is: the soft foam body prepared in step (2) of Example 1 is used as a substrate, and a hydrophobic modification treatment is performed. The improved soft foam body has a hemispherical convex structure arranged continuously and evenly at intervals. The specific method of its hydrophobic modification treatment is:

[0037] 5 parts by weight of heptadecafluorodecyltrimethoxysilane, 15 parts by weight of fumed silica, and 200 mL of ethanol were mixed, ultrasonically dispersed for 30 minutes, and stirred at 55° C. for 5 hours to obtain a hydrophobic agent. The hydrophobic agent was then sprayed onto the surface of the soft foam and cured to obtain an improved soft foam.

[0038] Other technical solutions are the same as those in the first embodiment.

[0039] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for preparing a skin-friendly and soft sanitary napkin, comprising preparing a liquid-permeable surface layer, preparing an absorbent body, preparing a liquid-impermeable bottom layer, and combining the liquid-permeable surface layer, the absorbent body and the liquid-impermeable bottom layer online into one body and cutting them into individual products, characterized in that: The preparation of the liquid-permeable surface layer comprises the following steps: (1) Preparation of raw materials: Pure cotton fiber and bicomponent fiber with skin-core structure are mixed evenly in a weight ratio of 1:2-1:3 as raw materials, and then sent to a web laying machine for cross-laying and drafting reinforcement to obtain a fiber web. The fiber web is then heated and rolled with a hot roller to obtain a soft nonwoven fabric. (2) Preparation of soft foam: using flexible foamable material and polyester polyol as main raw materials, adding a foaming agent, a catalyst and a stabilizer, and sending them into a mold for foaming treatment to obtain a soft foam, wherein the soft foam has a one-piece foam body, the bottom surface of the foam body is a flat structure, and the foam body has hemispherical structures evenly distributed at intervals; (3) cutting the soft foam; (4) transferring the cut soft foam body to the surface of the soft non-woven fabric, spraying or scraping hot melt adhesive on the contact portion between the soft non-woven fabric and the soft foam body, so that the cut soft foam body and the soft non-woven fabric are composited into one, thereby obtaining a liquid-permeable surface layer; The soft non-woven fabric has a front end, a middle part and a rear end connected in sequence along the length direction, and the soft foam is distributed on the front and rear ends of the surface of the soft non-woven fabric; The soft foam distribution area accounts for 1 / 5-2 / 5 of the total area of ​​the soft non-woven fabric; After step (4), a hydrophobic material layer is further compounded on both lateral sides of the liquid-permeable surface layer; The hydrophobic material layer is an improved soft foam, and the specific preparation process is: taking the soft foam as the substrate, performing hydrophobic modification treatment; the specific method of the hydrophobic modification treatment is: mixing 5 parts by weight of heptadecafluorodecyltrimethoxysilane, 15 parts by weight of fumed silica, and 200 mL of ethanol, performing ultrasonic dispersion for 30 minutes, stirring at 55°C for 5 hours to obtain a hydrophobic agent, and then spraying the hydrophobic agent onto the surface of the soft foam, performing a curing treatment, and thus obtaining the improved soft foam; The improved soft foam has a hemispherical convex structure which is continuously and evenly arranged at intervals.

2. The method for preparing the skin-friendly and soft sanitary napkin according to claim 1, characterized in that: The diameter of the hemispherical structure is 2-5 mm.

3. The method for preparing the skin-friendly and soft sanitary napkin according to claim 1, characterized in that: The soft foam is a polyurethane foam.

4. The method for preparing the skin-friendly and soft sanitary napkin according to claim 1, characterized in that: In step (1), the temperature of the hot rolling roller is controlled at 110-150°C.

5. The method for preparing the skin-friendly and soft sanitary napkin according to claim 1, characterized in that: The edges of the soft non-woven fabric surface are all compounded with soft foamed bodies.

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