CN107898560B

CN107898560B - Black sanitary towel

Info

Publication number: CN107898560B
Application number: CN201711208379.5A
Authority: CN
Inventors: 杨子平; 张晨; 任杰; 张乃文; 郁晓
Original assignee: SHANGHAI BIOBASE TECHNOLOGY CO LTD
Current assignee: SHANGHAI BIOBASE TECHNOLOGY CO LTD
Priority date: 2017-11-27
Filing date: 2017-11-27
Publication date: 2023-04-14
Anticipated expiration: 2037-11-27
Also published as: CN107898560A

Abstract

The invention provides a black sanitary towel, which comprises a sanitary towel body, wherein the sanitary towel body sequentially comprises a surface non-woven fabric layer, an absorption core and a bottom impermeable membrane from top to bottom; the surface non-woven fabric layer comprises a middle sheet, a retaining wall and side wings; the middle sheet is arranged in the middle of the surface layer non-woven fabric layer and is used for being matched with the bottom impermeable film to completely wrap the absorption core; the side wings are arranged on two sides of the surface layer non-woven fabric layer and used for fixing the sanitary towel; retaining walls are arranged on two sides of the middle sheet and used for blocking side leakage of the absorbent absorbed by the middle sheet or the middle core; the side wings and the middle piece are fixedly connected through part of the retaining wall; the surface non-woven fabric layer and the bottom impermeable membrane are black. The black sanitary towel provided by the invention can meet the basic requirements of the sanitary towel, and has the characteristics of bacteriostasis, peculiar smell removal, moisture absorption, ventilation, softness, comfort and complete degradation.

Description

Black sanitary towel

Technical Field

The invention relates to a sanitary towel, in particular to a black sanitary towel.

Background

The traditional sanitary towel adopts chemical fiber or all-cotton surface layer, which is difficult to avoid the trouble of bacteria. An official of the world health organization indicates that 50% of gynecological patients worldwide have used unsanitary supplies. In China, a large statistical result of 1996 shows that 38% of women using sanitary napkins are ill.

Polylactic acid materials are mainly used as medical products such as non-dismantling surgical sutures, skeleton materials for controlled release of medicaments and the like before industrial mass production. The polylactic acid has natural bacteriostatic activity without adding any medicament.

Chinese patent CN200810004422.0 discloses a corn polylactic acid fiber sanitary towel, which is composed of polylactic acid fiber spunlace non-woven fabrics, a woven absorption core layer and a basement membrane, and the product can be completely biodegradable.

Chinese patent 201410044061.8 discloses a bubble type soft non-woven fabric and a manufacturing method thereof, wherein the raw material polylactic acid high polymer is subjected to melt spinning and lapping and twice hot rolling and consolidation to form the fabric. The first hot rolling forms an annular rolling point, the second hot rolling forms a point rolling point, and finally the bubble type non-woven fabric is formed.

Chinese patent 201410269918.6 discloses a sanitary towel of preventing edge leakage, including top layer non-woven fabrics and the bottom prevention of seepage membrane that sets up from inside to outside, the top layer non-woven fabrics is three structures, and the top layer non-woven fabrics of intermediate lamella bonds with the top layer non-woven fabrics of both wings together, and it has the wood pulp fibre absorption core by the toilet paper cladding to fill in the middle of intermediate lamella top layer non-woven fabrics and the bottom prevention of seepage membrane. The surface layer of the sanitary towel provided by the invention is composed of 100% polylactic acid fiber or PLA/PBHV fiber hot air non-woven fabric.

From the above data, the conventional sanitary napkin or sanitary pad made of polylactic acid material does not have a black or spunlace nonwoven fabric as a surface layer.

Disclosure of Invention

In view of the above disadvantages of the prior art, the present invention provides a sanitary napkin for solving the problems of the prior art, such as poor bacteriostatic safety and poor degradable effect.

To achieve the above objects and other related objects, the present application is achieved by the following technical solutions.

The invention provides a black sanitary towel, which comprises a sanitary towel body, wherein the sanitary towel body sequentially comprises a surface non-woven fabric layer, an absorption core and a bottom impermeable membrane from top to bottom;

the surface non-woven fabric layer comprises a middle sheet, a retaining wall and side wings; the middle sheet is arranged in the middle of the surface layer non-woven fabric layer and is used for being matched with the bottom impermeable film to completely wrap the absorption core; the side wings are arranged on two sides of the surface layer non-woven fabric layer and used for fixing the sanitary towel body; retaining walls are arranged on two sides of the middle sheet and used for blocking side leakage of the absorbent absorbed by the middle sheet or the absorbent core; the side wings are fixedly connected with the middle piece through the retaining wall;

the surface non-woven fabric layer and the bottom impermeable membrane are black.

Preferably, the absorbent core is black.

Preferably, the contact angle of the surface layer non-woven fabric layer is 85-105 degrees. More preferably, the contact angle of the surface layer nonwoven fabric layer is 90 ° to 100 °.

Preferably, the surface layer non-woven fabric layer is prepared by taking black polylactic acid fiber as a raw material or taking a mixture of the black polylactic acid fiber and other black fibers as a raw material through a spunlace process. Preferably, the surface layer nonwoven fabric layer is prepared by a method comprising the following steps of opening, mixing and carding raw material fibers to form a fiber web layer with a certain thickness, and then jetting, namely spunlacing, the fiber web layer by using high-pressure and high-speed fine water flow to promote fibers in the fiber web to be mutually entangled, so that a nonwoven fabric with certain strength and thickness is formed.

Preferably, the thickness of the web layer is 0.5 to 2mm.

More specifically, in the water-jet process, a water-jet machine of FLLBG-250 type is used, the number of water-jet channels is 6, and the number of water-jet nozzles is 6.

Preferably, six water stabbing steps are arranged in the water stabbing step; the pressure of the first water jet head is 40-45 bar; the pressure of the second channel of the water stabs is 35-40 bar; the pressure of the third water stabs is 55-65 bar; the pressure of the fourth channel of the water stabs is 65-70 bar; the pressure of the fifth water stabs is 65-70 bar; the pressure of the sixth water stabs is 70-80 bar.

More preferably, the water-punching process is followed by a hydrophilic or hydrophobic treatment of the nonwoven fabric formed by the water-punching process. And (3) carrying out hydrophilic or hydrophobic treatment on the raw material fiber, so that the raw material fiber and the raw material fiber are mixed to reach an optimal hydrophilic-hydrophobic equilibrium state. More preferably, the hydrophilic and hydrophobic treatment is carried out by impregnating the hydroentangled web with a hydrophobic or hydrophilic agent. The treatment can effectively improve the cohesive force and the binding force of the fibers in the spunlace non-woven fabric, improve the physical properties of the finished non-woven fabric, and ensure that the non-woven fabric has good skin-friendly function and does not have moist body feeling.

Preferably, the hydrophilic agent is one or more of HS-DM-1 and SF-608 AA. The concentration of the hydrophilic agent in the impregnation liquid is 0.3-0.6 g/L. The temperature during the dipping treatment is 60-80 ℃.

The organosilicon hydrophobic agent comprises one or more of vinyltrimethoxysilane and perfluorooctyl vinyldimethoxysilane. The concentration of the hydrophobing agent in the impregnation liquid is 0.5-0.7 g/L. The temperature during the dipping treatment is 60-80 ℃.

More preferably, the hydrophilic modification is performed when the raw material fiber of the surface nonwoven fabric layer is a single polylactic acid fiber.

More preferably, the black other fiber is selected from one or more of bamboo charcoal fiber, black viscose fiber and binchotan fiber.

More preferably, when the raw material fiber of the surface layer nonwoven fabric layer is a mixture of polylactic acid fiber and other black fiber, the mass of the black polylactic acid fiber is at least 30wt%.

More preferably, when the raw material fibers of the surface layer nonwoven fabric layer contain other black fibers, the water repellency treatment is performed on the raw material fibers. Particularly preferably, when the black other fiber is one or both of a black viscose fiber and a binned carbon fiber, it is subjected to water repellency treatment.

The bamboo charcoal fiber is prepared by taking moso bamboos as raw materials, refining and honeycombing micropores of the bamboo charcoal by adopting a novel calcination process and a novel technology of pure oxygen high temperature and nitrogen blocking delay, and then carrying out melt spinning on nano bamboo charcoal micropowder and polyester modified slices with a honeycomb micropore structure trend. The unique fiber structure design has the characteristics of moisture absorption, ventilation, antibiosis, bacteriostasis, warm in winter and cool in summer, green environmental protection and the like. Preferably, the bamboo charcoal fiber is a polyester fiber modified by bamboo charcoal powder. More preferably, the bamboo charcoal powder is formed by carbonizing bamboo fiber at a high temperature of above 800 ℃.

The black viscose fiber can be formed into black by using color master batches or dyeing. More preferably, the black viscose fiber is obtained by spinning by mixing black color master batch into viscose fiber chips.

The binchotan fiber is a novel functional fiber spun by adding nano binchotan particles into viscose fiber taking natural wood pulp as a raw material. The binchotan is prepared by carbonizing natural oak serving as a raw material at high temperature of about 1300 ℃, can release negative ions and far infrared rays, and has antibacterial and bacteriostatic effects. The prepared long carbon fiber in the present application may be a commercial product existing in the prior art, such as prepared long carbon fiber of shanghai nao carbon industries ltd.

Preferably, the grammage of the surface layer nonwoven fabric layer is 15 to 60g/m ² 。

Preferably, the retaining wall is more hydrophobic than the intermediate sheet. Preferably, the grammage of the retaining wall is greater than the grammage of the middle sheet. Preferably, the grammage of the side wings is greater than the grammage of the retaining wall.

Preferably, the content of the black polylactic acid fiber in the retaining wall is at least 70wt%.

Preferably, the black polylactic acid fibers are present in the side flap in an amount of at least 70 wt.%.

Preferably, the absorbent core is comprised of wood pulp fibers covered by an outer toilet paper layer. The absorbent core is not exposed in this application and is completely wrapped between the top nonwoven layer and the bottom impermeable film. The absorbent core may or may not be black in appearance. More preferably, the outer toilet paper layer adopts wet strength paper. By wet strength paper is meant paper to which a wet strength agent has been added. Wet strength paper is generally judged to have the following criteria:

wet/dry strength (tensile strength) >20%;

paper that retains more than 15% dry strength and resists cracking or disintegration when wet or soaked in water.

Different products also have other properties, such as higher stiffness and printability, good smoothness, in particular appearance properties (such as holes, mottling and dust). The wet strength is obtained by adding wet strength agents such as melamine resin, polyepichlorohydrin and the like in the papermaking process. The paper is used as wet strength paper, and may be used in drawing, paper, etc. The earliest wet strength agents used UF and MF resins, which gradually became obsolete because they contained large amounts of formaldehyde and required good wet strength in an acidic system, while gradually used PAE or PPE resins, which achieved good wet strength in a slightly neutral system and were formaldehyde free.

Preferably, the bottom layer barrier film is a polyethylene composite. More preferably, the polyethylene composite material is formed by compounding one or more selected from high density polyethylene, low density polyethylene and linear low density polyethylene with black masterbatch. The weight of the black master batch accounts for 1-15 wt% of the total weight of the raw material components of the polyethylene material. More preferably, the gram weight of the bottom impermeable film is 10-45 g/m ² . The bottom anti-seepage film layer is formed by mixing a polyethylene material and color master batches and then heating, pressurizing and casting. Preferably, the thickness of the bottom impermeable layer is (0.02-0.12) mm.

Preferably, the surface layer non-woven fabric layer, the absorption core and the bottom layer impermeable membrane in the sanitary napkin body are compounded through hot pressing by hot melt adhesive. Preferably, the hot-melt adhesive hot-pressing compounding temperature is 120-140 ℃. More preferably, the brookfield viscosity of the hot melt adhesive at 140 ℃ is about 3500 to 3900 mPa-s; the Brookfield viscosity at 160 ℃ is about 1600 to 1800 mPas.

Preferably, the black sanitary napkin further comprises a black coating, and the black coating is wrapped on the outermost layer of the sanitary napkin body. More preferably, the black coating is made of black polyethylene material. The function of preventing moisture and keeping the moisture clean is achieved.

Preferably, the black sanitary napkin further comprises release paper, the bottom of the bottom layer anti-seepage film is provided with a bonding part, and the release paper is detachably connected with the bonding part of the bottom layer anti-seepage film. The release paper is used for preventing the adhesive on the sanitary towel before the sanitary towel is not used from being adhered to each other to cause the incapability of fixing, and the release paper is torn off to leak the bonding part in the using process. More preferably, the release paper is a black polyethylene material. More preferably, the bonding parts are a plurality of strip-shaped back glues adhered to the bottom of the bottom impermeable membrane, and the back glues are made of food glue.

As described above, the black sanitary napkin provided by the invention has the following beneficial effects:

1) According to the invention, as polylactic acid is polymerized and spun by taking lactic acid molecules as monomers, the polylactic acid molecules with short molecular chains possibly exist on the surface of the fiber, so that the pH value of the surface non-woven fabric layer adopting the polylactic acid in the application is weakly acidic and is consistent with the pH value of human skin, a protective slightly acidic environment can be provided for female menstrual periods, the bacteria grow consistently, and meanwhile, a peculiar smell removing function is provided; the bamboo charcoal fiber in other black fibers has the advantages of odor adsorption, bacteria resistance and the like.

2) The polylactic acid fiber has the performance close to that of polyester fiber and has better stretching property and moisture conductivity, so that the polylactic acid fiber is used as a middle sheet, can quickly guide menstrual blood to the middle absorption layer, simultaneously keeps the dryness and the cleanness of the cloth surface due to the poorer moisture absorption, and provides a dry and clean environment for women in menstrual periods;

3) In the surface non-woven fabric layer of the polylactic acid material, the gram weight and the thickness of the side retaining wall and the side wing are both larger than those of the middle sheet, so that a good barrier is provided for the lateral flow of menstrual blood, and meanwhile, the hydrophobic property of the retaining wall is stronger than that of the middle sheet, so that the non-woven fabric obtains soft and smooth hand feeling while the side non-woven fabric is further prevented from absorbing the menstrual blood, and the menstrual blood directly seeps into the absorption core due to the obstruction of the side water-repellent non-woven fabric in the process of flowing down without side leakage;

4) The absorption core of the sanitary towel is formed by wrapping wood fluff pulp by the toilet paper, and the absorption rate can completely reach the standard of the national standard GB/T8939-2008;

5) The bottom impermeable film and the envelope of the sanitary towel adopt the polyethylene film, so the sanitary towel has good usable mechanical property and flexibility, and simultaneously has good air permeability, and the comfort of the fully degradable sanitary towel is improved; meanwhile, the low-temperature hot melt adhesive is compounded with the middle absorption core and the surface non-woven fabric layer, so that any performance of the PLA film cannot be lost.

In a word, the black sanitary towel provided by the invention can meet the basic requirements of the sanitary towel, has the characteristics of bacteriostasis, peculiar smell removal, moisture absorption, ventilation, softness, comfort and complete degradation, is an ideal substitute material of the existing sanitary towel, is a brand new environment-friendly and functional concept, accords with trend trends, and has a very good market prospect.

Drawings

Fig. 1 is a schematic view showing the overall structure of a sanitary napkin of the present invention.

Fig. 2 is a schematic view showing the structure of the surface layer nonwoven layer in the sanitary napkin of the present invention.

The component numbers in fig. 1 and 2 are as follows:

1	surface layer non-woven fabric layer
		11	Intermediate sheet
12	Retaining wall
		13	Side wing
2	Absorbent core
		3	Bottom impermeable film
4	Release paper
		5	Black coating film

Detailed Description

Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not noted in the following examples are generally performed under conventional conditions or conditions recommended by each manufacturer.

When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.

Example 1

As shown in fig. 1 and fig. 2, in the embodiment of the present invention, a black sanitary napkin is provided, which includes a sanitary napkin body, and the sanitary napkin body sequentially includes, from top to bottom, a surface nonwoven layer 1, an absorbent core 2, and a bottom impermeable film 3; the surface non-woven fabric layer comprises a middle sheet 11, a retaining wall 12 and a side wing 13; the middle sheet 11 is arranged in the middle of the surface layer non-woven fabric layer 1 and is used for being matched with the bottom impermeable membrane 3 and completely wrapping the absorption core 2; the side wings 13 are arranged on two sides of the surface layer non-woven fabric layer 1 and are used for fixing the sanitary towel body; the retaining walls 12 are arranged on two sides of the middle sheet, and the retaining walls 12 are used for blocking the side leakage of the absorbent articles of the middle sheet 11 or the absorbent core 2; the side wings 13 are fixedly connected with the middle piece 11 through retaining walls 12; the surface non-woven fabric layer 1 and the bottom impermeable membrane 3 are black.

In a preferred embodiment, the contact angle of the surface nonwoven layer 1 is 85 ° to 105 °. Preferably, the surface layer nonwoven fabric layer 1 is prepared by using black polylactic acid fiber as a raw material or using a mixture of black polylactic acid fiber and other black fibers as a raw material through a spunlace process.

In a preferred embodiment, the hydroentangling further comprises subjecting the nonwoven fabric formed by the hydroentangling process to a hydrophilic or hydrophobic treatment. In a more preferred embodiment, the hydrophilic modification is performed when the raw material fiber of the surface nonwoven layer is a single polylactic acid fiber. In a more preferred embodiment, the black other fibers are selected from one or more of bamboo charcoal fibers, black viscose fibers and binchotan fibers.

In a preferred embodiment, when the raw material fiber of the surface layer nonwoven fabric layer is a mixture of polylactic acid fiber and other black fiber, the mass of the black polylactic acid fiber is at least 30wt%.

In a preferred embodiment, when the raw material fibers of the surface layer nonwoven fabric layer contain other black fibers, the raw material fibers are subjected to water repellent treatment. Particularly preferably, when the black other fiber is one or both of black viscose fiber and binned carbon fiber, it is subjected to water repellency treatment.

In a preferred embodiment, the grammage of the surface layer nonwoven layer is 15-60 g/m ² 。

In a preferred embodiment, the retaining wall is more hydrophobic than the intermediate sheet. In a preferred embodiment, the grammage of the retaining wall is greater than the grammage of the intermediate sheet. In a preferred embodiment, the grammage of the side wings is greater than the grammage of the retaining wall.

In a preferred embodiment, the content of the black polylactic acid fiber in the retaining wall is at least 70wt%.

In a preferred embodiment, the black polylactic acid fibers are present in the side flaps in an amount of at least 70 wt.%.

In a preferred embodiment, the absorbent core is comprised of wood pulp fibers covered by an outer toilet paper layer.

In a preferred embodiment, the bottom barrier film is a polyethylene composite. In a preferred embodiment, the grammage of the lower barrier film is 10 to 45g/m ² . In a preferred embodiment, the thickness of the lower barrier layer is (0.02 to 0.12) mm.

In a preferred embodiment, the surface layer nonwoven layer, the absorption core and the bottom layer impermeable membrane in the sanitary napkin body are compounded through hot pressing by hot melt adhesive. In a preferred embodiment, the hot melt adhesive hot-press compounding temperature is 120-140 ℃. In a preferred embodiment, the brookfield viscosity of the hot melt adhesive at 140 ℃ is about 3500 to 3900 mPa-s; the Brookfield viscosity at 160 ℃ is about 1600 to 1800 mPas.

In a preferred embodiment, the black sanitary napkin further comprises a black coating, and the black coating is wrapped on the outermost layer of the sanitary napkin body. In a preferred embodiment, the black coating is made of black polyethylene. Plays a role in preventing moisture and keeping the moisture clean.

In a preferred embodiment, the black sanitary napkin further comprises a release paper, the bottom of the bottom layer impermeable membrane is provided with a bonding part, and the release paper is detachably connected with the bonding part of the bottom layer impermeable membrane.

Example 2

The embodiment discloses a specific material of a surface layer non-woven fabric layer in a black sanitary towel and a preparation method thereof.

The fabric is prepared by taking 30wt% of black polylactic acid fiber and 70wt% of black viscose as raw material fibers through a spunlace process. The spunlace process comprises the following steps of opening, mixing and carding raw material fibers to form a fiber network layer with the thickness of 1.0-1.2 mm, spraying high-pressure and high-speed fine water flow to the fiber network layer to perform spunlace treatment, so that a non-woven fabric with certain thickness and strength is formed, and performing water repellent treatment on the non-woven fabric. In the water-jet procedure, a water-jet machine of FLLBG-250 type is adopted, the number of water-jet channels is 6, and the number of water-jet nozzles is 6 groups. Six spunlaces are arranged in the spunlacing step; the pressure of the first water jet head is 40bar; the pressure of the second channel of the water stabs is 35bar; the pressure of the third water stabs is 55bar; the pressure of the fourth channel of the water stabs is 70bar; the pressure of the fifth water stabs is 70bar; the pressure of the sixth hydroentangling head is 75bar. During water repellent treatment, vinyl trimethoxy silane is used as a water repellent agent, and the concentration of the water repellent agent in the impregnation liquid is 0.5g/L; the temperature during the immersion treatment was 60 ℃.

In the embodiment, the black viscose fiber is obtained by mixing black color master batches into viscose fiber slices for spinning.

The intermediate layer forming the surface layer nonwoven fabric layer was prepared by the above materials and methods in the examples of this application.

When 70wt% of polylactic acid fiber and 30wt% of black viscose fiber are adopted in the raw material fiber; the thickness of the fiber net layer is 1.5-2 mm; and no hydrophilic or hydrophobic treatment is performed after the hydroentangling treatment. Thereby forming the retaining wall and the side wing material of the surface non-woven fabric. The grammage of the retaining wall and the side wings is tested (30 g/m) ² ) Is heavier than the gram weight of the middle sheet (18 g/m) ² ) Large, and the hydrophobicity (contact angle of 100 degrees) of the retaining wall and the flank is larger than that of the flankThe intermediate sheet has high hydrophobicity (contact angle of 90 °).

Example 3

The embodiment discloses a specific surface layer non-woven fabric layer material in a black sanitary towel and a preparation method thereof.

The polylactic acid fiber is prepared by taking 50wt% of black polylactic acid fiber and 50wt% of binchotan fiber as raw material fibers through a spunlace process. The spunlace process comprises the following steps of opening, mixing and carding raw material fibers to form a fiber network layer with the thickness of 1.0-1.5 mm, spraying high-pressure and high-speed fine water flow to the fiber network layer to perform spunlace treatment, so that a non-woven fabric with certain thickness and strength is formed, and performing water repellent treatment on the non-woven fabric. In the water jet process, a FLLBG-250 type water jet machine is adopted, the number of water jet channels is 6, and the number of water jet nozzles is 6 groups. Six spunlaces are arranged in the spunlacing step; the pressure of the first water stabs head is 42bar; the pressure of the second channel of the water stabs is 38bar; the pressure of the third water stabs is 60bar; the pressure of the fourth channel of the water stabs is 65bar; the pressure of the fifth water stabs is 70bar; the pressure of the sixth hydroentangling head is 75bar. During water repellent treatment, vinyl trimethoxy silane is used as a hydrophobic agent, and the concentration of the hydrophobic agent in the impregnating solution is 0.5g/L; the temperature during the immersion treatment was 80 ℃.

In the examples of the present application, the intermediate layer forming the surface nonwoven fabric layer was prepared by the above-described materials and methods.

When 80wt% of polylactic acid fiber and 20wt% of black viscose fiber are adopted in the raw material fiber; the thickness of the fiber net layer is 1.5-2 mm; and no hydrophilic or hydrophobic treatment is performed after the hydroentangling treatment. Thereby forming the retaining wall and the side wing material of the surface non-woven fabric. The grammage of the retaining wall and the side wings is tested (32 g/m) ² ) Is heavier than the gram weight of the middle sheet (20 g/m) ² ) Large, and the hydrophobicity of the retaining wall and the flanks (contact angle of 102 °) is stronger than the hydrophobicity of the intermediate sheet (contact angle of 87 °).

Example 4

The fabric is prepared by taking 30wt% of black polylactic acid fiber and 70wt% of bamboo charcoal fiber as raw material fibers through a spunlace process. The spunlace process comprises the following steps of opening, mixing and carding raw material fibers to form a fiber network layer with the thickness of 0.7-1.0 mm, spraying high-pressure and high-speed fine water flow to the fiber network layer to perform spunlace treatment, so that a non-woven fabric with certain thickness and strength is formed, and performing water repellent treatment on the non-woven fabric. In the water jet process, a FLLBG-250 type water jet machine is adopted, the number of water jet channels is 6, and the number of water jet nozzles is 6 groups. Six spunlaces are arranged in the spunlacing step; the pressure of the first water stabs head is 40bar; the pressure of the second channel of the water stabs is 35bar; the pressure of the third water stabs is 60bar; the pressure of the fourth water stabs is 70bar; the pressure of the fifth channel of the water stabs is 70bar; the pressure of the sixth channel of the hydroentangling head is 80bar. When in water repellent treatment, perfluorooctyl vinyl dimethoxysilane is used as a hydrophobic agent, and the concentration of the hydrophobic agent in the impregnating solution is 0.7g/L; the temperature during the immersion treatment was 60 ℃.

The black viscose fiber in the embodiment is obtained by mixing black color master batches into viscose fiber slices for spinning.

The intermediate layer forming the surface nonwoven layer was prepared in the examples of this application from the materials and methods described above.

When the raw material fiber adopts 80wt% of polylactic acid fiber and 20wt% of black viscose fiber; the thickness of the fiber net layer is 1.2-1.5 mm; and no hydrophilic or hydrophobic treatment is performed after the hydroentangling treatment. Thereby forming the retaining wall and the side wing material of the surface non-woven fabric. The grammage of the retaining wall and the side wing (27 g/m) is tested ² ) Is heavier than the gram weight of the middle sheet (16 g/m) ² ) Large and the hydrophobicity of the wall and flanks (contact angle of 104 deg.) is stronger than the hydrophobicity of the intermediate sheet (contact angle of 87 deg.).

Example 5

The embodiment discloses a specific material of a surface non-woven fabric layer in a black sanitary towel and a preparation method thereof.

The black polylactic acid fiber fabric is prepared by taking 60wt% of black polylactic acid fiber and 40wt% of black viscose as raw material fibers through a spunlace process. The spunlace process comprises the following steps of opening, mixing and carding raw material fibers to form a fiber network layer with the thickness of 1.2-1.5 mm, spraying high-pressure and high-speed fine water flow to the fiber network layer to perform spunlace treatment, so that a non-woven fabric with certain thickness and strength is formed, and performing water repellent treatment on the non-woven fabric. In the water-jet procedure, a water-jet machine of FLLBG-250 type is adopted, the number of water-jet channels is 6, and the number of water-jet nozzles is 6 groups. Six spunlaces are arranged in the spunlacing step; the pressure of the first water stabs is 45bar; the pressure of the second channel of the water stabs is 40bar; the pressure of the third water stabs is 60bar; the pressure of the fourth channel of the water stabs is 65bar; the pressure of the fifth channel of the water stabs is 65bar; the pressure of the sixth hydroentangling head is 75bar. In the water repellent treatment, perfluorooctyl vinyl dimethoxysilane is used as a hydrophobic agent, and the concentration of the hydrophobic agent in the impregnating solution is 0.6g/L; the temperature during the immersion treatment was 60 ℃.

When the raw material fiber adopts 90wt% of polylactic acid fiber and 10wt% of black viscose fiber; the thickness of the fiber net layer is 1.5-2 mm; and no hydrophilic or hydrophobic treatment is performed after the hydroentangling treatment. Thereby forming the retaining wall and the side wing material of the surface non-woven fabric. The grammage of the retaining wall and the side wings is tested (32 g/m) ² ) Is heavier than the gram weight of the middle sheet (22 g/m) ² ) Large and the hydrophobicity of the dam and flanks (contact angle of 104 deg.) is stronger than the hydrophobicity of the intermediate sheet (contact angle of 89 deg.).

Example 6

The polylactic acid fiber is prepared by taking 100wt% of black polylactic acid fiber as raw material fiber through a spunlace process. The spunlace process comprises the following steps of opening, mixing and carding raw material fibers to form a fiber web layer with the thickness of 1.2-1.5 mm, spraying high-pressure and high-speed micro water flow on the fiber web layer to perform spunlace treatment, so that a non-woven fabric with certain thickness and strength is formed, and performing hydrophilic treatment on the non-woven fabric. In the water jet process, a FLLBG-250 type water jet machine is adopted, the number of water jet channels is 6, and the number of water jet nozzles is 6 groups. Six spunlaces are arranged in the spunlacing step; the pressure of the first water stabs is 45bar; the pressure of the second channel of the water stabs is 40bar; the pressure of the third water stabs is 60bar; the pressure of the fourth water stabs is 65bar; the pressure of the fifth water stabs is 65bar; the pressure of the sixth hydroentangling head is 75bar. During hydrophilic treatment, HS-DM-1 is used as a hydrophilic agent, and the concentration of the hydrophilic agent in the impregnation liquid is 0.6g/L; the temperature during the dipping treatment was 80 ℃.

When the raw material fiber adopts 100wt% of polylactic acid fiber, the thickness of the fiber net layer is 1.5-2 mm; and hydrophilic treatment is performed after the spunlace treatment. During hydrophilic treatment, HS-DM-1 is used as a hydrophilic agent, and the concentration of the hydrophilic agent in the impregnation liquid is 0.4g/L; the temperature during the dipping treatment was 80 ℃. Thereby forming the retaining wall and the side wing material of the surface non-woven fabric. The grammage of the retaining wall and the side wings is tested (33 g/m) ² ) Is heavier than the gram weight of the middle sheet (21 g/m) ² ) Large and the hydrophobicity of the dam and flanks (contact angle of 105 deg.) is stronger than the hydrophobicity of the intermediate sheet (contact angle of 92 deg.).

Example 7

The embodiment discloses an absorption core, which is composed of wood pulp fibers coated by an outer toilet paper layer. The absorbent core is not exposed in this application and is completely wrapped between the top nonwoven layer and the bottom impermeable film. The absorbent core may appear black. The outer toilet paper layer adopts wet strength paper.

Example 8

The embodiment discloses a bottom impermeable film, which is a polyethylene composite material. The color masterbatch is formed by compounding linear low-density polyethylene and black master batch; the black master batch accounts for 10wt% of the total mass of the linear low-density polyethylene and the black master batch.

The bottom anti-seepage film layer is formed by mixing a polyethylene material and color master batches and then heating, pressurizing and casting. The thickness of the bottom barrier layer described in this exampleIs 0.08mm. The gram weight of the bottom impermeable film is 20g/m ² 。

Example 9

The embodiment discloses a black coating, which is wrapped on the outermost layer of a sanitary towel body. The black coating is made of black polyethylene material. Plays a role in preventing moisture and keeping the moisture clean.

Example 10

The embodiment discloses a from type paper, the bottom of bottom prevention of seepage membrane is equipped with bonding portion, from type paper with bonding portion detachable connections of bottom prevention of seepage membrane. The release paper is used for preventing the adhesive on the sanitary towel before the sanitary towel is not used from being adhered to each other to cause the incapability of fixing, and the release paper is torn off to leak the bonding part in the using process. The release paper is made of black polyethylene material. The bonding part is a plurality of strip-shaped back glues which are stuck to the bottom of the bottom impermeable membrane and made of food glue.

In examples 2 to 6 above, the absorbent core as described in example 7, the back sheet barrier film as described in example 8, and the release paper as described in example 9 were used, respectively.

In the embodiment, the middle surface layer non-woven fabric layer, the absorption core and the bottom impermeable membrane of the sanitary towel body are compounded through hot pressing by hot melt adhesive. The hot-pressing compounding temperature of the hot melt adhesive is 120-140 ℃. The Brookfield viscosity of the hot melt adhesive at 140 ℃ is about 3500-3900 mPa & s; the Brookfield viscosity at 160 ℃ is about 1600 to 1800 mPas.

In the application, the sanitary towel adopts polylactic acid material as the surface layer non-woven fabric layer, which presents subacidity, can provide a protective subacid environment for female menstrual period when the pH value of the sanitary towel is consistent with the pH value of human skin, enables bacteria to grow consistently and provides a peculiar smell removal function; the bamboo charcoal fiber in other black fibers has the advantages of odor adsorption, bacteria resistance and the like.

The polylactic acid fiber has the performance close to that of polyester fiber and has better stretching property and moisture conductivity, so that the polylactic acid fiber is used as the middle sheet, can quickly guide menstrual blood to the middle absorption layer, simultaneously keeps the dryness and the cleanness of the cloth surface due to the poorer moisture absorption, and provides a dry and clean environment for women in menstrual periods.

In the surface layer non-woven fabric layer of the polylactic acid material, the gram weight and the thickness of the retaining wall and the side wings on the side surface are larger than those of the middle sheet, a good barrier is provided for the menstrual blood to flow laterally, and meanwhile, the hydrophobic type of the retaining wall is stronger than that of the middle sheet, so that the non-woven fabric obtains soft and smooth hand feeling while the side non-woven fabric is further prevented from absorbing the menstrual blood, and the menstrual blood directly seeps into the absorption core due to the obstruction of the side water-repellent non-woven fabric, and cannot generate side leakage.

The bottom anti-seepage film and the envelope of the sanitary towel adopt the polyethylene film, so that the sanitary towel has good usable mechanical property and flexibility, and simultaneously has good air permeability, and the comfort of the fully-degradable sanitary towel is improved; meanwhile, the low-temperature hot melt adhesive is compounded with the middle absorption core and the surface non-woven fabric layer, so that any performance of the PLA film cannot be lost.

While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. The black sanitary towel is characterized by comprising a sanitary towel body, wherein the sanitary towel body sequentially comprises a surface non-woven fabric layer, an absorption core and a bottom impermeable membrane from top to bottom; the middle surface layer non-woven fabric layer, the absorption core and the bottom impermeable membrane of the sanitary towel body are compounded through hot pressing by hot melt adhesive;

the surface non-woven fabric layer comprises a middle sheet, a retaining wall and side wings; the middle sheet is arranged in the middle of the surface layer non-woven fabric layer and is used for being matched with the bottom impermeable film to completely wrap the absorption core; the side wings are arranged on two sides of the surface layer non-woven fabric layer and used for fixing the sanitary towel body; retaining walls are arranged on two sides of the middle sheet and are used for blocking side leakage of the absorbent absorbed by the middle sheet or the absorbent core; the lateral wings are fixedly connected with the middle piece through the retaining wall;

the surface non-woven fabric layer and the bottom impermeable membrane are black;

the contact angle of the surface non-woven fabric layer is 85-105 degrees;

the surface non-woven fabric layer is prepared by taking black polylactic acid fiber as a raw material or taking a mixture of the black polylactic acid fiber and other black fibers as a raw material through a spunlace process; when the raw material fiber of the surface non-woven fabric layer is a mixture of black polylactic acid fiber and other black fibers, the mass of the black polylactic acid fiber is at least 30 wt.%; the content of the black polylactic acid fiber in the retaining wall is at least 70wt%; the content of the black polylactic acid fiber in the side wing is at least 70wt%; the bottom impermeable membrane is a polyethylene composite material; the gram weight of the surface non-woven fabric layer is 15 to 60g/m ² (ii) a The hydrophobicity of the retaining wall is stronger than that of the middle sheet; the gram weight of the retaining wall is greater than that of the middle sheet; the gram weight of flank is greater than the gram weight of barricade.

2. The black sanitary napkin as claimed in claim 1, wherein: one or two of the following features are included:

after the water jet, performing hydrophilic or hydrophobic treatment on the non-woven fabric formed by the water jet process;

the black other fiber is selected from one or more of bamboo charcoal fiber, black viscose fiber and binchotan fiber.

3. The black sanitary napkin as claimed in claim 1, wherein: the absorption core is made of wood pulp fibers coated by an outer toilet paper layer.

4. The black sanitary napkin of claim 1 wherein: one or two of the following characteristics are included:

the gram weight of the bottom impermeable film is 10 to 45g/m ² ；

The thickness of the bottom impermeable film is (0.02 to 0.12) mm.

5. The black sanitary napkin of claim 1 wherein: including one or more of the following features;

the hot-melt adhesive hot-pressing compounding temperature is 120-140 ℃;

the Brookfield viscosity of the hot melt adhesive at 140 ℃ is 3500-3900 mPa · s;

the Brookfield viscosity of the hot melt adhesive at 160 ℃ is 1600-1800 mPa · s.

6. The black sanitary napkin of claim 1 wherein: including one or more of the following features:

the black sanitary towel also comprises a black coating, and the outermost layer of the sanitary towel body is wrapped by the black coating;

the black coating is made of black polyethylene material.

7. The black sanitary napkin of claim 1 wherein: the black sanitary napkin further comprises release paper, the bottom of the bottom layer anti-seepage film is provided with a bonding part, and the release paper is detachably connected with the bonding part of the bottom layer anti-seepage film.