CN115177440A

CN115177440A - Absorption core and preparation device and preparation method thereof

Info

Publication number: CN115177440A
Application number: CN202210796032.1A
Authority: CN
Inventors: 李银琪; 邹汉涛; 肖佳菲; 高超; 程兰
Original assignee: Hubei Sibao Nursing Supplies Co ltd; Wuhan Textile University
Current assignee: Hubei Sibao Nursing Supplies Co ltd; Wuhan Textile University
Priority date: 2022-07-01
Filing date: 2022-07-07
Publication date: 2022-10-14

Abstract

The present disclosure relates to an absorbent core, a manufacturing apparatus and a manufacturing method thereof, wherein the absorbent core comprises at least two fiber layers with different water absorption strengths, and the at least two fiber layers are sequentially laminated and combined and are configured such that the water absorption strength gradually increases from a side close to a human body to a side far from the human body. The absorption core body disclosed by the invention generates a wetting gradient through an interlayer differential capillary effect, and realizes the one-way conduction of water by combining the fiber fineness in the thickness direction and the configuration of the fiber layer tightness, thereby effectively improving the reverse osmosis condition and improving the dryness of the core body. Thus, the wearing comfort of the sanitary absorbent product is improved, and the use experience of a user is improved.

Description

Absorption core body and preparation device and preparation method thereof

Technical Field

The present disclosure relates to the field of disposable hygienic absorbent articles, and more particularly, to an absorbent core, and apparatus and method for making the same.

Background

With the development of social productivity, the living standard of people is improved, and disposable sanitary absorbent products such as paper diapers and sanitary towels become one of essential daily necessities of people in daily life

The performance of the absorbent core, which is one of the core components of the disposable sanitary absorbent article, directly affects the performance of the disposable sanitary absorbent article. Currently, the absorbent cores of most disposable sanitary absorbent articles on the market employ wood pulp cores. Although the wood pulp core body has good liquid absorption performance, the wood pulp core body is thick, lumps and faults are easy to occur, the diffusibility after liquid absorption is poor, uncomfortable feeling and even 'red buttocks' symptom can appear after a baby wears the paper diaper, and the female sanitary napkin is easy to reverse seep after absorbing menstrual blood.

And the fluff pulp in the absorbent core belongs to the softwood pulp of the pulp category. As the main raw material for manufacturing the fluff pulp is needle-leaved wood, but forest resources in China are scarce, and the fluff pulp almost completely depends on import, the price of the needle-leaved pulp is uncertain, and the manufacturing cost is difficult to control.

In view of this, for example, how to control the manufacturing cost of the disposable hygienic product and improve the user experience while ensuring the performance is an urgent technical problem to be solved by those skilled in the art.

Disclosure of Invention

In order to solve the problems in the prior art, the present disclosure provides, in a first aspect, an absorbent core.

The absorbent core of the present disclosure includes at least two fibrous layers having different water absorption strengths, which are sequentially laminated and combined and configured such that the water absorption strength gradually increases from the side close to the human body to the side far from the human body.

In one embodiment of the absorbent core of the present disclosure, the absorbent core includes at least two fibrous layers made of different raw materials, and the absorbent core is configured such that the water absorption strength gradually increases from the side close to the human body to the side away from the human body.

In one embodiment of the absorbent core of the present disclosure, the fibrous layer is prepared by a melt-blowing method, and the fibrous layer is prepared by raw materials comprising a mixture of melt-blown granules and a hydrophilic modifier;

the preparation raw materials of the fiber layer also comprise antibacterial master batches.

In one embodiment of the absorbent core of the present disclosure, the absorbent core includes at least two fiber layers having different web structures, and the absorbent core is configured such that the fiber fineness is gradually reduced, the fiber bulkiness is gradually increased, and the water absorption strength is gradually increased from the side close to the human body to the side away from the human body.

In one embodiment of the absorbent core of the present disclosure, the fibrous layer is configured to be prepared using a melt-blowing process and has an irregular distribution of fibrous voids.

In one embodiment of the absorbent core of the present disclosure, the fiber layer with lower water absorption strength of the at least two fiber layers comprises 93.5 to 97% of melt-blown granules, 3 to 5% of hydrophilic master batch, 0 to 1.5% of antibacterial master batch, the fiber fineness is 2 to 101, and the layer weight is 30% to 100g/1 ² ；

The fiber layer with higher water absorption strength in at least two fiber layers comprises 87 to 94 percent of melt-blown granules, 6 to 10 percent of hydrophilic master batch and 0 to 3 percent of antibacterial master batch, the fiber fineness is 1 to 51 1, and the layer weight is 50 to 180g/1 ² 。

In a second aspect, the present disclosure also provides a device for preparing an absorbent core, comprising:

a melt-blowing machine configured to prepare fiber layers different in water absorption strength and lay the prepared fiber layers on a web;

a conveying device, which comprises a net curtain and an air suction device, wherein the net curtain is configured below a melt-blowing die head of the melt-blowing machine and moves between the melt-blowing machine and a winding device.

In one embodiment of the manufacturing apparatus of the present disclosure, the manufacturing apparatus further comprises,

the fan is arranged below the net curtain, is connected with the air suction device and is configured to be used for attaching the fiber layer sprayed by the melt-blowing machine to the net curtain;

a winding device configured to convey the fiber layers laid on the web, and to perform bonding, embossing, and cutting processes on the fiber layers different in water absorption strength to make an absorbent core.

In one embodiment of the manufacturing apparatus of the present disclosure, at least two of the meltblowing machines are included, and the at least two meltblowing machines are configured to respectively manufacture the fiber layers having different water absorption strengths.

In one embodiment of the manufacturing apparatus of the present disclosure, the manufacturing apparatus further includes a powdering device between the meltblower and the winding device, the powdering device being configured to apply powder on the higher water-absorbent-strength fiber layer;

the powder is super absorbent resin powder.

In a third aspect, the present disclosure also provides a method for producing an absorbent core using the absorbent core according to any one of claims 1 to 6, characterized in that the method comprises the steps of:

preparing at least two fiber layers with different water absorption strengths, wherein the at least two fiber layers are configured to gradually increase the water absorption strength from the side close to the human body to the side far from the human body.

In one embodiment of the manufacturing method of the present disclosure, the water absorption strength of the fiber layer is changed by adjusting the manufacturing raw material of the fiber layer, so that the absorbent core is configured to gradually increase from the side close to the human body to the side far from the human body.

In one embodiment of the preparation method of the present disclosure, at least two fiber layers are prepared by a melt-blowing method, and the water absorption strength of the fiber layers is changed by adjusting the preparation parameters of a melt-blowing machine, so that the absorbent core is configured to gradually become thinner, gradually become tighter in fiber bulkiness, and gradually increase in water absorption strength from the side close to the human body to the side far from the human body.

In one embodiment of the disclosed method of making, the preparation parameters include: the distance from the outlet of the orifice of the meltblowing die to the receiving screen, the power of the air compressor, the power of the air heater and/or the temperature of the zones of the screw extruder.

The absorbent core body of the present disclosure includes at least two fibrous layers that the water absorption intensity is different, and at least two fibrous layers range upon range of the complex in proper order and are constructed as by being close to human side to keeping away from human side water absorption intensity and progressively increase, and the fineness of fiber tapers off, and the fluffy degree of fibre gradually becomes inseparable.

Specifically, this disclosed fibrous layer is prepared by non-woven technology and is formed, has good imbibition ability, can not take place deformation easily after the design, and then the absorption core body that is prepared by at least two-layer fibrous layer and forms when having good imbibition ability, also is difficult for appearing phenomena such as sticking together, fault, has guaranteed the quality of absorption core body, has effectively improved user's use experience.

The absorbent core body disclosed by the invention has a plurality of fiber layers with different water absorption strengths and fiber web structures, so that the absorbent core body has stronger one-way moisture-conducting capacity and can quickly absorb liquid. In addition, at least two fiber layers of the absorption core are sequentially laminated and compounded, and the absorption strength is gradually increased from the side close to the human body to the side far away from the human body, the fiber fineness is gradually reduced, and the fiber bulkiness is gradually changed to be tight. The hydrophilic gradient of the absorption core body changes, the wetting gradient is generated through the interlayer differential capillary effect, the configuration of the fiber fineness in the thickness direction and the fiber layer tightness is combined, and the super absorbent resin is applied to the fiber layer with higher water absorption strength, so that the fiber layer far away from the human body side can quickly absorb and store the liquid in the fiber layer near the human body side, the fiber layer near the human body side can keep a dry and comfortable state, and the use comfort of a user is ensured.

It should be noted that, both the preparation apparatus and the preparation method of the absorbent core of the present disclosure are suitable for preparing the absorbent core of the present disclosure, and therefore, both the preparation apparatus and the preparation method have technical effects corresponding to those of the absorbent core, which can be fully understood by those skilled in the art based on the foregoing description, and therefore, no further description is provided herein.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic view of a portion of the structure of an absorbent core provided by an embodiment of the present disclosure;

FIG. 2 is a partial structural cross-sectional view of an absorbent core provided by an embodiment of the present disclosure;

FIG. 3 is a schematic view of a partial structure of a fiber layer provided by an embodiment of the present disclosure;

FIG. 4 is a schematic view of an apparatus for making an absorbent core from a single meltblowing machine provided by one embodiment of the disclosure;

fig. 5 is a schematic view of an apparatus for making absorbent cores from multiple melters according to one embodiment of the disclosure.

The one-to-one correspondence between component names and reference numbers in fig. 1 to 5 is as follows:

1. an absorbent core; 2. a fibrous layer; 3. fibers; 4. a functional layer; 5. a melt-blowing machine; 51. a screw extruder; 52. a filter; 53. a metering pump; 54. a melt-blowing die; 55. an air compressor; 56. an air heater; 57. a fan; 58. a hopper; 6. a conveying device; 61. a net curtain; 62. an air suction device; 7. a winding device; 8. a dusting device.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

Specific embodiments of the present disclosure are described below with reference to the accompanying drawings.

In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.

In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree and order of importance, and the premise that each other exists, and the like.

In this context, "equal," "same," and the like are not strictly mathematical and/or geometric limitations, but also encompass errors that may be understood by one skilled in the art and that may be allowed for manufacturing or use, etc.

The absorption core body of the existing sanitary products such as sanitary towels, paper diapers and the like is basically a wood pulp core body, the phenomena of lump formation, fault, reverse osmosis and the like easily occur to the wood pulp core body during use, and the problem of user complaint caused by poor use experience exists.

This disclosed absorption core passes through the design realization one-way wet function of leading of raw materials screening and structure, and one-way wet nature of leading is through the phenomenon of some moisture unidirectional transport that have simulated the nature existence, and the moisture demonstrates the characteristic of one-way transmission in the material when making the material absorb water, and it can be with human top layer sweat transmission to external environment to show for the fabric in the textile field, and external moisture can not get into human one side through the fabric. And the one-way moisture-conducting material can quickly transfer moisture or humidity of one surface to the other surface and keep the one surface dry all the time, so that the one-way moisture-conducting material is a functional material which is favored by people.

The polypropylene (PP) superfine fiber is prepared by adopting a melt-blown process, the conventional PP is hydrophobic and oleophilic, and the melt-blown material has a higher specific surface area and is commonly used as a mask, a medical and sanitary material, a filtering material and an oil absorption material. Through carrying out hydrophilization modification on conventional PP fibers and reasonably configuring fiber raw materials and non-woven fabric structures with different components, the melt-blown fibers can be arranged in the thickness direction of the non-woven fabric according to different hydrophilicities, so that a wetting gradient is generated, and the effect of one-way moisture guide is realized. So that the water can be transferred from the hydrophobic side to the hydrophilic side without being easily transferred reversely.

By applying the design of the structural principle, a hydrophilic structure with gradient can be formed in the thickness direction. So that the absorption core body has excellent water absorption and storage performance and one-way moisture-conducting function. Furthermore, the absorption core does not use chemical agents, and the safety of the absorption core in contact with a human body can be ensured. Thus, the safety and the comfort of the sanitary product are improved under the condition of reducing the cost.

Therefore, the present disclosure provides an absorbent core made of melt blown fibers to overcome the defects in the prior art and achieve the purpose of improving the user experience.

The absorbent core body of the present disclosure includes at least two fibrous layers that absorb water the intensity is different, and at least two-layer fibrous layer range upon range of complex in proper order and is constructed and is close to the human side to keeping away from the human side intensity of absorbing water and progressively increases gradually.

In practical use, the fibrous layer that keeps away from the human body side in the absorption core can be close to the liquid absorption and the storage in the fibrous layer of the human body side to the fibrous layer that makes to be close to the human body side can remain dry and comfortable state throughout, effectively improves user's use comfort.

For better understanding, specific structures and effects of the absorbent core 1 of the present disclosure will be described in detail below with reference to fig. 1 to 3 of the drawings in the specification in conjunction with specific embodiments.

Referring to fig. 1, in one embodiment of the present disclosure, an absorbent core 1 has a plurality of fibrous layers 2 with different water absorption strengths, which form the absorbent core 1 with different water absorption gradients in the thickness direction, so that the absorbent core 1 has strong unidirectional moisture wicking ability and can rapidly absorb liquid. Further, the absorbent core 1 is formed by laminating and compounding at least two fiber layers 2 in this order, and is configured such that the water absorption strength gradually increases from the side close to the human body to the side away from the human body.

Referring to fig. 2, in the present embodiment, the absorbent core 1 of the present disclosure includes three fiber layers 2 having different water absorption strengths, and the three fiber layers 2 are sequentially laminated and combined together, and are configured such that the water absorption strength of the fiber layers 2 is gradually increased from the side close to the human body to the side far from the human body.

It should be noted that the number of the fiber layers of the absorbent core 1 of the present disclosure is not limited to three in the present embodiment, and those skilled in the art may select an appropriate number of layers based on actual needs, for example, two layers, four layers, and the like, which are an integer greater than or equal to two layers, on the basis of satisfying the function that these fiber layers are laminated and combined in sequence and the water absorption strength of the fiber layer 2 gradually increases from the side close to the human body to the side far from the human body.

That is, when the user uses the absorbent core 1 of the present disclosure, the side having a weak water absorption strength is disposed near the user, and the side having a strong water absorption strength is disposed far from the user. Taking the orientation of fig. 1 and 2 as an example from the perspective of the reader, the absorbent core 1 has a lower fibrous layer 2 that absorbs water more than an upper fibrous layer 2.

The water absorption capacity includes, but is not limited to, changing the water absorption strength of the fiber layer 2 by preparing different fiber layers 2 with different proportions or kinds of raw materials; and changing the fiber web structure of the fiber layer 2 by changing the preparation process parameters in the melt-blowing method, thereby changing the water absorption strength of the fiber layer 2.

In one embodiment of the present disclosure, the raw material for the preparation of the underlying fibrous layer 2 in the absorbent core 1 has a higher water absorption strength than the raw material for the preparation of the overlying fibrous layer 2.

In one embodiment of the present disclosure, the fibers 3 of the underlying fibrous layer 2 in the absorbent core 1 are finer and the web is tighter than the fibers of the overlying fibrous layer 2.

In one embodiment of the present disclosure, the fibrous structure of the underlying fibrous layer 2 and the water absorption strength of the raw material of which the absorbent core 1 is made are stronger than those of the overlying fibrous layer 2.

In detail, each of the fibrous layers 2 in the absorbent core 1 is configured to be able to absorb and store a certain amount of liquid. In addition, because the absorption capacity of the fiber layer 2 positioned below is stronger than that of the fiber layer 2 positioned above, the fiber net of the fiber layer 2 positioned above is bulkier, and the fibers are thicker, which is beneficial to the downward diffusion and permeation of liquid.

In actual use, after the liquid is first absorbed by the upper fiber layer 2, the liquid is diffused and permeated downward through the fiber pores in the fiber layer 2, so that the lower fiber layer 2 is configured to absorb the liquid in the upper fiber layer 2 and store the liquid. The absorbent core 1 composed of the above fiber layers 2 has a unidirectional moisture-transmitting function.

In actual use, the fiber layer 2 positioned on the upper side of the fiber layer and in contact with the human body can be always in a dry and comfortable state, so that the skin of a user can be effectively protected, uncomfortable symptoms such as allergy and diaper rash are prevented, and the comfort degree and the use experience of wearing the user are improved.

The water absorption of the upper fiber layer 2 is weaker than that of the lower fiber layer 2, the fiber net is fluffy, the fibers are thicker, and the liquid reverse osmosis is not facilitated. So that the liquid stored inside the underlying fibrous layer 2 is not absorbed back by the overlying fibrous layer 2, resulting in a better anti-reflux property of the absorbent core 1 of the present disclosure.

With continued reference to fig. 1, the absorbent core 1in this embodiment is shaped as a rectangular parallelepiped.

According to other embodiments of the present disclosure, the absorbent core 1 of the present disclosure may also be circular, oval, etc., or may be thick in the middle and thin in the periphery to enhance the liquid absorption capacity of the absorbent core 1. Of course, the skilled person can choose to design the absorbent core 1in other profiled structures according to the actual requirements.

According to one embodiment of the present disclosure, the absorbent core 1 of the present disclosure further comprises a wrapping layer. The wrapping layer is disposed at the outermost layer of the absorbent core 1 and is configured to wrap at least two fibrous layers 2 in the absorbent core 1.

In particular, the wrapping layer is understood to be the outermost layer of the absorbent core 1, such that the wrapping layer is capable of fastening, wrapping all the fibrous layers 2 in the absorbent core 1 together. Thereby preventing the liquid absorption and storage capacity of the absorbent core body 1 from being reduced due to the excessive looseness between every two of the multiple fiber layers 2.

The wrapping layer is constructed such that the portion of the wrapping layer close to the human body in the use state is made of a skin-friendly nonwoven fabric or the like, and the portion of the wrapping layer away from the human body is made of a hydrophobic nonwoven fabric or a waterproof breathable film, so that the liquid leakage to the clothes of the user after the absorbent core 1 absorbs liquid can be prevented.

In some embodiments of the present disclosure, the wrap layer has a skin-friendly top layer and a waterproof bottom layer. Wherein the skin-friendly top layer is less absorbent than the hydrophilic meltblown fiber layer 2 to prevent liquid in the absorbent core 1 from penetrating back to the surface. The bottom layer of the wrapping layer is made of hydrophobic materials or waterproof breathable films, so that after the melt-blown absorption core body 1 absorbs liquid, the probability of liquid leakage in the fiber layer 2 far away from the human body side can be effectively reduced.

According to an embodiment of the present disclosure, the different water absorption strengths of the fiber layers 2 in the absorbent core 1 of the present disclosure can also be achieved by using different proportions or kinds of raw materials.

In detail, when the fiber layers 2 with different water absorption strengths are prepared by using the same raw materials, the water absorption strength of the fiber layers 2 is changed by adjusting the proportion of the hydrophilic master batch. The hydrophilic masterbatch has a small proportion, and the water absorption strength of the fiber layer 2 prepared from the hydrophilic masterbatch is also reduced.

For example, a first fiber layer prepared by 95% polypropylene PP polymer slice and 5% hydrophilic master batch; and a second fiber layer prepared from 90% polypropylene PP polymer chips and 10% hydrophilic master batch. The water absorption strength of the first fiber layer is weaker than that of the second fiber layer, namely, the water absorption strength of the fiber layer 2 is changed by changing the proportion of the hydrophilic master batches.

The above specific numerical value is only one of the raw material formulation schemes of the fiber layer 2, and the formulation scheme is not the only choice as long as the difference in water absorption strength can be formed. The specific raw material ratio of the fiber layer 2 can be selected and designed by those skilled in the art according to actual needs, and is not limited to this.

In one embodiment of the present disclosure, the fiber layer 2 is made by a non-woven technique, and since the fibers 3 are not completely cooled after being formed into fibers and then are adhered to each other to generate thermal bonding, the fiber layer has good stability after being cooled and cannot be easily deformed. And then fibrous layer 2 and by the change in shape can not take place for the absorbent core 1 that multilayer fibrous layer 2 formed when using, can effectively avoid appearing the circumstances such as sticking together, fault, guaranteed absorbent core 1's dimensional stability.

Specifically, the fiber layer 2 in the present disclosure is prepared by a melt-blowing method. The fiber layer 2 prepared by the melt-blown method is prepared from a mixture of hydrophilic master batches and melt-blown granules.

According to another embodiment of the present disclosure, the raw material of the fiber layer 2 prepared by the melt-blowing method may also be a mixture of hydrophilic master batch, melt-blown granules and antibacterial master batch. The fiber layer 2 prepared by using the raw material has the characteristics of strong water absorption and good antibacterial performance.

The absorption core body 1 prepared by the fiber layer 2 with the antibacterial master batch also has the characteristics of strong water absorption and good antibacterial performance. In the in-service use, disinfect absorption core 1 behind the absorption liquid to reduce bacterial growing, avoid the user the condition of anaphylactic reaction to appear, protected user's skin, improved the comfortable degree that the user used, improved user's use impression.

The raw material of the fiber layer 2 prepared by the melt-blowing method may further include at least one functional additive such as color masterbatch, odor removal masterbatch, flavor enhancement masterbatch, etc. in addition to the hydrophilic masterbatch, the melt-blown pellet, and the antibacterial masterbatch described above. Those skilled in the art can select suitable additives according to actual needs, and the selection is not limited herein.

The melt-blown granules are PP, PE, PET, PA, PLA, EVA and EMA polymer chips.

The hydrophilic master batch is prepared by blending a hydrophilic modifier and polymer slices, and the polymer slices are modified by the hydrophilic modifier, so that the mixture of the hydrophilic modifier and the polymer slices has hydrophilic performance.

The antibacterial master batch is prepared by blending an antibacterial agent and polymer slices, and the polymer slices are modified by the antibacterial agent, so that the mixture of the antibacterial master batch and the polymer slices has antibacterial and disinfectant properties.

With continued reference to fig. 2, the absorbent core 1 of the present disclosure may further include a functional layer 4 between two adjacent fiber layers 2, wherein the functional layer 4 has odor removing, heating or sterilizing properties. The design can be made by those skilled in the art according to the actual needs without being limited thereto.

It can be understood that the absorption core body 1 of the present disclosure can be made to have various functions by providing the functional layer 4 having various functions, so as to satisfy various requirements of users, and further improve the user experience.

In one embodiment of the present disclosure, referring to fig. 3, the fiber layer 2 of the present disclosure is a fiber 3 structure and has a plurality of irregularly distributed fiber pores.

It should be noted that the absorbent core 1in this embodiment has the fiber layers 2 with different water absorption strengths, and the preparation raw material ratio of each fiber layer 2 may be the same. That is, the layer structure of the fiber layer 2 is changed only by changing part of the melt-blowing process preparation process parameters in the process of preparing the fiber layer 2, thereby achieving adjustment of the water absorption strength of the fiber layer 2.

In conjunction with the manufacturing apparatus of fig. 4, in some embodiments of the present disclosure, the fineness of the fibers in the fiber layer 2 is adjusted by adjusting the distance between the meltblowing die 54 and the web 61.

The take-up distance between meltblowing die 54 and web 61 affects the thickness of the fibers in fiber layer 2, the loft of fiber layer 2, and the degree of bonding between two adjacent fiber layers 2. The fiber layer 2 is subjected to hot air, and the drafting area of the fiber layer mainly occurs in the area close to the spinneret orifice.

Specifically, when the receiving distance between the meltblowing die 54 and the web 61 is increased, the longer the hot air is drawn and cooled, the fewer the bonding points between the fiber layers 2 are, and the smaller the fineness of the fibers is. So that the fiber layer becomes fluffy and soft and the breaking strength is smaller and smaller.

Correspondingly, as the take-up distance between meltblowing die 54 and web 61 decreases, the time for the drawn fibers to cool becomes shorter and the thermal bonding between the fibers becomes stronger, so that the fiber layer 2 becomes tighter and the web density increases.

In practical use, the closer the distance between the melt-blowing die head 54 and the mesh curtain 61 is, the less the fibers 3 are completely cooled and laid on the mesh curtain 61, the denser and tighter the fiber layers 2 are bonded to each other, and the stronger the liquid storage capacity of the fiber pores on the fiber layers 2 is; correspondingly, as the distance between the melt-blowing die head 54 and the net curtain 61 is longer, the fiber layer 2 becomes looser, and the liquid storage capacity of fiber pores formed by the fiber layer 2 is weakened, so that the liquid is more prone to downward diffusion and penetration.

In some embodiments of the present disclosure, the tightness of the fibers 3 in the fiber layer 2 can also be adjusted by adjusting the speed and temperature of the hot air in the air compressor 55 and the air heater 56, thereby improving the water absorption strength thereof.

Through improving hot-blast speed and temperature, can effectively reduce the fibre fineness of fibrous layer 2, make the fibre tangle and increase, the feel of fibrous layer 2 is changed from hard to soft, and specific surface area increases, has improved fibrous layer 2's water-absorbing capacity.

Specifically, the hot air acts to draw the fibers 3 during the spinning process. The drawing force of the fibers 3 sprayed from the spinneret orifice can be increased by increasing the speed of the hot air to reduce the fiber number of the fiber layer 2. The hot air temperature is increased, so that the cooling and solidification of the fibers 3 can be effectively delayed, the drafting effect is enhanced, the fiber number is reduced, the specific surface area is increased, the water absorption strength of the fiber layer 2 is improved, and the tensile breaking strength of the fiber layer 2 is improved.

In practice, when the temperature of the hot air in the air heater 56 and the speed of the hot air in the air compressor 55 are higher, the fiber fineness of the produced fiber layer 2 is smaller, and the water absorbing capacity of the fiber layer 2 formed of the finer fibers 3 is enhanced.

This is because, in the process of preparing the melt-blowing machine 5 by spinning, the hot air temperature and the air speed of the air heater 56 and the air compressor 55 are increased, so that the fiber 3 with a smaller fiber fineness can be prepared, the density of the fiber 3 in the fiber layer 2 is increased, the fiber pores formed by interlacing the fibers 3 are increased, and the liquid storage capacity of the fiber layer 2 is improved.

On the contrary, in the same way, the temperature and the wind speed of the hot wind in the air heater 56 and the air compressor 55 are adjusted to be low, so that the fibers 3 in the fiber layer 2 become thick, and further the fiber layer 2 formed by the thick fibers 3 has better water guiding performance and reduced liquid storage capacity.

According to some embodiments of the present disclosure, changing the water absorption strength of the fiber layer 2 may also be achieved by adjusting the temperature of each device in the meltblowing machine 5. Such as the temperature of the screw extruder 51, melt blowing die 54, etc.

Specifically, in the melt-blown spinning process, the fibers 3 in a molten state are affected by the outside air, and the temperature gradually decreases. Therefore, the temperature of each zone in the melt-blowing machine 5 is increased, which is beneficial to maintaining the temperature of the fiber 3 in a molten state and prolonging the time of the fiber 3 in the molten state, so that more fibers 3 can be drawn and drawn by hot air. Further reducing the fiber fineness of the fiber layer 2 and improving the water absorption strength of the fiber layer 2.

According to another embodiment of the present disclosure, the above manufacturing methods can also be used in combination during the manufacturing process of preparing the individual fiber layers 2 of the meltblown absorbent core 1 of the present disclosure with different water absorption strengths, i.e., the structure of the fiber layers is changed and different raw material ratios are used during the manufacturing process.

In some embodiments of the present disclosure, the meltblown absorbent core 1 of the present disclosure comprises at least two fibrous layers 2, wherein the raw material of the fibrous layer 2 having lower water absorption strength comprises 93.5 to 97% meltblown pellets, 3 to 5% hydrophilic master batch, 0 to 1.5% antibacterial master batch. The fiber layer 2 prepared based on the above data has a fiber fineness of 2 to 101 (micrometers) and a layer weight of 30 to 100g/1 ² (grams per cubic meter).

The absorption core body 1 comprises at least two fiber layers 2, wherein the fiber layer 2 with higher water absorption strength comprises 87-94% of melt-blown granules, 6-10% of hydrophilic master batch and 0-3% of antibacterial master batch. The fiber layer 2 prepared based on the above data has a fiber fineness of 1 to 51 (micrometers) and a layer weight of 50 to 180g/1 ² (grams per cubic meter).

In a specific embodiment of the present disclosure, the fiber layer 2 with low water absorption strength is prepared by mixing 95% of polypropylene PP and 5% of hydrophilic master batch. The fiber layer 2 with higher water absorption strength is prepared by mixing 90% of polypropylene PP and 10% of hydrophilic master batch. The grammage of the fiber layer 2 with lower water absorption strength is controlled to be 90g/1 ² (g per cubic meter), the square meter gram weight of the fiber layer 2 with higher water absorption strength is controlled to be 130g/1 ² (grams per cubic meter). The specific process parameters for fiber layer 2 prepared using the above data are shown in table 1.

TABLE 1 melt-blown Process parameters for the layers and preparation

In some embodiments of the present disclosure, the total weight of each layer of fibrous layers 2 in the meltblown absorbent core 1 accounts for at least 50% of the total weight of the meltblown absorbent core 1.

It is to be understood that the meltblown absorbent core 1 of the present disclosure is primarily made from the fibrous layer 2, with other functional additives being made as a supplement. As such, the meltblown absorbent core 1 of the present disclosure combines the characteristics of high liquid absorbency and light weight.

In addition to the absorbent core 1 described above, the present disclosure also provides a device for preparing such an absorbent core 1, and the specific structure of the absorbent core 1 has been described in detail in the foregoing, and will not be described herein again. The specific structure of the apparatus for producing an absorbent core 1 of the present disclosure and the production principle thereof will be described in detail below with reference to fig. 4 and 5 in conjunction with two examples.

Example 1

Referring to fig. 4, in the present embodiment, the apparatus for producing an absorbent core 1 of the present disclosure includes a meltblowing machine 5, a conveying device 6, and a winding device 7.

The melt-blowing machine 5 comprises a screw extruder 51, a filter 52, a metering pump 53, a melt-blowing die head 54, an air compressor 55, an air heater 56, a fan 57 and a hopper 58.

Specifically, referring to fig. 4, the hopper 58 is connected with the screw extruder 51 and configured to convey the mixed raw material fed into the hopper 58 into the screw extruder 51. The screw extruder 51 is configured to further mix and extrude the raw materials, which are gradually heated, from a solid state to a molten state while being mixed.

The filter 52 is configured to be connected to the screw extruder 51 and configured to filter impurities in the raw material in a molten state in the screw extruder 51, preventing clogging of the spinning orifices of the meltblowing die 54 during spinning.

The metering pump 53 is connected to the filter 52 and is configured to meter the spinning melt filtered by the filter 52 to a predetermined value.

The meltblowing die 54 is connected to a metering pump 53 and an air heater 56, respectively, and is configured to spin the melt metered by the metering pump 53. Further, an air compressor 55 and an air heater 56 are connected together to heat air to generate high-speed and high-temperature air for clamping spinning melt in the melt-blowing die head to draw at high speed to prepare superfine fibers.

And a fan 57 arranged below the net curtain 61, connected with a suction device 62 and configured for the fiber layer 2 sprayed by the melt-blowing machine 5 to be attached to the net curtain 61. The magnitude of the suction wind of the fan 57 plays a crucial role in the bulkiness of the formed fibre layer 2. In particular, when the absorbent core 1 having a large areal density is produced, the bulkiness of the web layer 2 can be reduced by increasing the suction power of the blower 57.

The working principle of the melt-blowing machine is as follows: the user or the external device feeds the mixed raw materials into a hopper 58 of the melt-blowing machine 5, the raw materials are further mixed and gradually heated in a screw extruder 51, the solid state is changed into the spinning melt in the molten state, the spinning melt is filtered by a filter 52 to remove impurities, the filtered spinning melt raw materials are distributed according to a preset value by a metering pump 53, and finally the spinning melt extruded from a spinneret orifice is subjected to high-speed drafting by high-speed high-temperature air preheated by an air compressor 55 and an air heater 56, so that the fiber layer 2 is formed.

It is noted that during the spinning preparation, the melt blown fibers are drawn by high speed hot air and laid down on the web 61 to form the fiber layer 2. The fan 57 below the screen 61 ensures that the fiber layer 2 can be sufficiently adsorbed by the screen 61, so as to avoid the occurrence of defects such as flying, thin net, net turning and the like caused by the separation of the fiber layer 2 from the screen 61.

In some embodiments of the present disclosure, the speed and temperature of the hot air generated by the air compressor 55 and the air heater 56 are suitably increased and the intensity of the wind force of the fan 57 is reduced while increasing the distance from the exit of the spinneret orifice to the receiving screen 61. The fiber fineness of the fiber layer 2 can be reduced and the structure of the fiber layer 2 can be made more bulky. The specific principle has been described in detail above, and it is not described herein too much, and those skilled in the art can select the design according to the actual requirement.

When a plurality of fiber layers 2 need to be prepared, the specific working principle of the melt-blowing machine is similar to the above, but the difference is that after the first fiber layer is prepared, a user or external equipment is needed to change the proportion of raw materials, change the water absorption strength of the raw materials, and then feed new raw materials into the hopper 58. The subsequent preparation process is consistent with the working principle of the melt-blowing machine and is not described too much here.

Further, a conveying device 6 may be further provided below the meltblowing die 54 of the meltblowing machine 5. The conveying device 6 comprises a net curtain 61 and a suction device 62.

Specifically, the screen 61 can be moved below the meltblowing die 54 of the meltblowing machine 5 so as to receive meltblown fibers ejected from the orifices of the meltblowing die 54.

In one embodiment of the present disclosure, the melt-blown raw material (PP chips and 10% hydrophilic masterbatch) is fed into the hopper 58 of the melt-blowing machine 5, extruded by the screw extruder 51, filtered by the filter 52, and metered by the metering pump 53, and then the molten raw material is melt-extruded, cooled, drawn, split, lapped, wound by the melt-blowing die 54, and made into the first fiber layer on the net curtain 61.

After the first fiber layer is prepared, the user or external equipment changes the proportion of the melt-blown raw material (PP chips and 5% hydrophilic master batch), feeds the melt-blown raw material into the hopper 58 of the melt-blowing machine 5, repeats the preparation steps, and prepares a second fiber layer on the net curtain 61.

At this point, the first fibrous layer is unwound and laid on the web 61, and the second fibrous layer is unwound and laid on the first fibrous layer. The two fiber layers are compounded and conveyed to a reinforcing area by the net curtain 61, and the absorption core body 1 with the unidirectional moisture guiding function is prepared by ultrasonic point bonding.

In one embodiment of the present disclosure, the meltblown die 54 is melt extruded, cooled, drawn, split, lapped, and wound to form a first fiber layer on the web 61. After the user adjusts the distance between the meltblowing die 54 and the screen 61 in the meltblowing machine 5, the second fiber layer is continuously prepared without changing the raw material ratio. The above-described preparation process is repeated to form a second fibrous layer on the web.

It is noted that merely changing the distance between meltblowing die 54 and web 61 in meltblowing machine 5, the smaller the take-up distance, the less sufficient the cooling of the ejected fibers. And the thermal bonding effect between the fibers 3 becomes strong, so that the bulkiness of the fiber layer 2 is reduced and the density is increased. The lower the water absorption capacity of the formed fibre layer 2, and vice versa.

At this point, a first fibrous layer is unwound from and laid on the web 61, and a second fibrous layer is unwound from and laid on the first fibrous layer. The two fiber layers are compounded and conveyed to a reinforcing area by the net curtain 61, and the absorption core body 1 with the unidirectional moisture-conducting function is obtained after ultrasonic point bonding preparation.

In some embodiments of the present disclosure, after the first fiber layer is formed on the web 61, the speed of the hot air in the air compressor 55 and the temperature of the hot air in the air heater 56 can be adjusted to change the structure of the second fiber layer.

Through improving hot-blast speed and/or hot-blast temperature, can make 3 fibre titer in the fibrous layer 2 reduce, the fibrous layer that so make shows to become soft gradually in the feel, and the fibre tangle in the fibrous layer 2 increases, and then has improved the water absorption intensity of fibrous layer 2.

In some embodiments of the present disclosure, after the first fibrous layer is formed on the web 61, the temperature of the working zone may also be adjusted to change the structure of the second fibrous layer. The temperature of the working area is increased to make the viscosity of the raw material melt in a molten state smaller, so that the fiber 3 is more favorably drawn and thinned by high-speed hot air, and the fineness of the fiber 3 is reduced. On the premise that the melt-blown raw material is not excessively degraded, the temperature of each area of the melt-blown die head 54 and the like is properly increased, so that the fibers 3 are gradually thinned, the specific surface area of the melt-blown fiber layer 2 is increased, and the water absorption strength of the fiber layer 2 is improved.

In one embodiment of the present disclosure, the preparation of the fiber layers 2 having different water absorption strengths can also be achieved by adjusting the preparation parameters of the meltblowing machine 5, such as the distance of the outlet of the spinneret orifice to the receiving screen 61, and/or the power of the air compressor 55, and/or the power of the air heater 56, and the temperature of the zones in the meltblowing machine 5. It is also possible to adjust the raw materials for the fiber layer 2 and/or to adjust the parameters for the melt-blowing machine 5.

The above preparation process parameters can be combined with each other and adjusted simultaneously to change the fiber web structure of the fiber layer 2, thereby changing the water absorption strength of the fiber layer 2. Such as increasing the speed of hot air or the temperature of hot air, etc., as appropriate, while the receiving distance is increased.

In a specific embodiment of the present disclosure, the preparation raw material ratio of the fiber layer 2 and the process parameter value of the melt-blowing machine 5 can be changed simultaneously, so as to change the water absorption strength of the fiber layer 2. The specific raw material ratio and the process parameters of the melt-blowing machine 5 in the preparation process are all selected and designed by those skilled in the art according to actual use requirements, as long as the different water absorption strengths of the fiber layers 2 can be realized, and the absorption core 1 formed by the fiber layers 2 has a water absorption gradient, which is not limited too much here.

In some embodiments of the present disclosure, the apparatus for preparing the absorbent core 1 further comprises a winding device 7. The winding device 7 is configured to receive the fibre layer 2 on the transport device 6. After receiving the at least two fiber layers 2 with different water absorption strengths, the winding device 7 compounds the fiber layers to tightly attach the fiber layers 2, and the condition that the absorption core body 1 is layered due to the fact that the fiber layers 2 are too loose is avoided.

After the reinforcement is finished, the fiber layer 2 is processed through ultrasonic embossing, the multi-layer fiber layer 2 can be further pressed and fastened continuously, and the multi-layer fiber layer 2 can be beautified through patterns and patterns arranged on the ultrasonic embossing machine. And finally, cutting the processed multilayer fiber layer 2 by a cutting machine to enable the size of the cut multilayer fiber layer 2 to meet the actual requirement. The composite fibre layer 2 can now be used as an absorbent core 1 on a disposable hygienic absorbent article.

Example 2

Compared with the embodiment 1, the main difference of the embodiment is that two fiber layers 2 with different water absorption strengths are respectively prepared by two melt-blowing machines 5, and the prepared two fiber layers 2 are conveyed to a winding device 7 by a conveying device for processing, and an absorption core body 1 is prepared.

Only the differences between embodiment 2 and embodiment 1 will be described below with reference to fig. 5. Specifically, when preparing the mixed raw materials, a user or an external device is required to prepare two mixed raw materials having different water absorption strengths. The water absorption strength at least comprises any one of the following methods: changing the water absorption strength of the raw materials prepared by the fiber layer 2; the web structure of the fibers 3 is changed to form the fiber layers 2 with different water absorption strengths.

The two raw materials with different water absorption strengths are fed into the hopper 58, and the subsequent operation and preparation principle are the same as those described in example 1, and will not be described herein.

After the first fiber layer 2 is spun by one of the meltblowing machines 5 on the web 61, the web 61 conveys the first fiber layer 2 to the position below the meltblowing die 54 of the other meltblowing machine 5, so that the second fiber layer 2 is directly laid on the first fiber layer 2, and the composite fiber layer is directly formed.

Specifically, a plurality of melt-blowing machines 5 are adopted to prepare the fiber layers 2 with different water absorption strengths, the interval time between the layers is short, the bonding performance of each layer is good, and the structure is stable. When the first fiber layer 2 and the second fiber layer 2 are compounded, the fibers between the layers are not completely cooled and solidified, and the fiber layers are mutually bonded. It is found through experiments that the liquid absorption performance of the composite fiber layer 2 formed by the method is significantly improved.

In some embodiments of the present disclosure, the process parameters of the two melters 5 are made different by adjusting the production process parameters of the two melters 5. The two melters 5 will then produce fibre layers 2 with different fibre structures, which have different water absorption strengths.

In some embodiments of the present disclosure, the preparation raw material ratio of the two meltblowing machines 5 and the preparation process parameters of the meltblowing machines 5 may be adjusted simultaneously. The specific preparation principle and operation are as described above, and are not described herein in any greater detail.

Referring to fig. 5, in another embodiment of the present disclosure, the apparatus for preparing the absorbent core 1 further includes a dusting device 8, and the dusting device 8 may be disposed between the meltblower 5 and the winding device 7.

Specifically, after the melt-blowing machine 5 prepares the fiber layer 2 with high water absorption strength, the net curtain 61 conveys the fiber layer 2 to the lower part of the dusting device 8, at this time, the dusting device 8 is started, and powder with certain functionality placed inside the dusting device 8 is spread on the fiber layer 2 with high water absorption strength, so that the fiber layer 2 has the function of the powder. In a specific embodiment of the present disclosure, the inside of the powdering device 8 may be provided with super absorbent resin powder. High water-absorbing resin powder is spread on the fiber layer 2, so that the fiber layer 2 has high liquid absorption performance, and the liquid absorption capacity of the fiber layer 2 with higher water absorption strength is improved.

It is noted that the super absorbent resin powder swells by absorbing water when it comes into contact with a liquid. Therefore, in order to avoid the situation that the high water absorption resin powder resists the liquid from seeping down after the expansion, the high water absorption resin powder is spread on the fiber layer 2 with higher water absorption intensity, namely, the fiber layer 2 at the side far away from the human body.

In some embodiments of the present disclosure, the dusting device 8 may also be internally provided for adsorbing flavors, sterilizing powders, etc. The design can be designed by those skilled in the art according to practical requirements without being limited too much.

In some embodiments of the present disclosure, a plurality of powdering devices 8 may be further provided, and each powdering device 8 may be provided with functional powders having different functions inside, so that the meltblown absorbent core 1 may have various properties. So as to meet various requirements of users and improve the use experience of the users.

In this embodiment, the functional powder is spread on the outermost fiber layer 2 having a high water absorption strength in the absorbent core 1, and the effect of the functional powder is most effective. Since the absorbent core 1 of the present disclosure has a good one-way moisture-wicking function, the fiber layer 2 positioned at the lowest layer and having the best water absorption strength can store more liquid than the fiber layers 2 positioned at other positions. The functional powder is spread on the bottommost layer of the absorption core body 1, so that the functional powder is in contact with liquid, and the effect of the functional powder can be exerted to the maximum extent.

Of course, the functional powder may be spread on any one of the fibrous layers 2 in the absorbent core 1. After the absorbent core 1 absorbs liquid, the functional powder can exert its own function, and will not hinder the one-way moisture-conducting function of the absorbent core 1, and those skilled in the art can select the design according to the actual requirement, and is not limited herein.

In addition to the absorbent core 1, the present disclosure also provides a method for preparing the absorbent core 1, and the specific structure and preparation device of the absorbent core 1 have been described in detail in the foregoing, and are not described in detail herein again. The specific structure of the apparatus for producing an absorbent core 1 of the present disclosure and the production principle thereof will be described in detail with reference to one embodiment.

Example 1

Embodiments of the present disclosure provide a method for preparing an absorbent core 1, the method comprising the following specific steps:

the absorbent core 1 of the present disclosure has at least two fibrous layers 2 having different water absorption strengths. The absorbent core 1 is prepared by laminating and compounding the fiber layers 2 in order in which the water absorption strength of the fiber layers 2 monotonically increases or monotonically decreases. Specifically, the absorbent core 1 gradually increases in water absorption strength from the side close to the human body to the side away from the human body.

In one embodiment of the present disclosure, the fiber layers 2 having different water absorption strengths are prepared by adjusting the ratio of the raw materials for preparing the fiber layers 2, i.e., the ratio of the hydrophilic masterbatch particles to the melt-blown pellets.

In one embodiment of the present disclosure, the preparation of the fiber layers 2 having different water absorption strengths can also be achieved by adjusting the preparation parameters of the meltblowing machine 5, such as the distance of the outlet of the spinneret orifice to the receiving screen 61, and/or the power of the air compressor 55, and/or the power of the air heater 56, and the temperature of the zones in the meltblowing machine 5. The specific principles for adjusting the raw materials for preparing the fiber layer 2 and/or adjusting the preparation parameters of the melt-blowing machine 5 are described in detail above and will not be described in detail herein.

In one embodiment of the present disclosure, before the first fiber layer 2 and the second fiber layer 2 are made into the absorbent core 1, the method further comprises the step of conveying the first fiber layer 2 and the second fiber layer 2 to a winding device 7 by a conveying device 6, so as to make the absorbent core 1. The working principle of the winding device 7 has been described in detail above and will not be described in further detail here.

In another embodiment of the present disclosure, two meltblowing machines 5 may also be used in the method of making the absorbent core 1, or a plurality of meltblowing machines 5 may be used.

In another embodiment of the present disclosure, in step S3, the absorbent core 1 may be further formed by sequentially stacking a plurality of fiber layers 2 in order of strength of water absorption from strong to weak. That is, the absorbent core 1 can be produced by sequentially stacking a plurality of fibrous layers 2 in the order of increasing or decreasing water absorption strength.

In some embodiments of the present disclosure, the meltblown machine 5 in step S2 may also adjust the fiber fineness and fiber bulkiness of the fiber layer 2 by adjusting the distance between the meltblown die 54 and the web 61, the wind speed of the hot wind generated by the air compressor 55 and the air heater 56, and the temperature of the hot wind, so as to adjust the water absorption performance thereof.

In one embodiment of the present disclosure, further comprising applying a powder having a functionality on at least one of the fibrous layers 2. Specifically, after the fiber layer 2 is prepared by spinning in the melt-blowing machine 5, functional powder may be spread on the fiber layer 2 by the powder spreading device 8. Such as super absorbent resin powder, to improve the liquid-absorbing performance of the fiber layer 2 and further improve the liquid-absorbing performance of the absorbent core 1.

In a specific embodiment of the present disclosure, the absorbent core 1 comprises two fibrous layers 2 having different water absorption strengths, respectively designated as a first fibrous layer 2 and a second fibrous layer 2. In this embodiment two melters 5 are used to produce the first fibrous layer 2 and the second fibrous layer 2.

Wherein the raw materials of the first fiber layer 2 comprise 96.2 percent of PP melt-blown granules, 3 percent of hydrophilic master batch and 0.8 percent of antibacterial master batch. The grammage of the first fiber layer 2 is controlled to be 100g/1 ² (grams per cubic meter) and an average fiber fineness of 81 (microns).

The raw materials of the second fiber layer 2 are 92.2% of PP melt-blown granules, 7% of hydrophilic master batches and 0.8% of antibacterial master batches. The grammage of the second fiber layer 2 is controlledAt 150g/1 ² (grams per cubic meter), average fiber fineness 51 (microns), and specific process parameters for fiber layer 2 prepared using the above data are shown in table 2.

TABLE 2 melt-blown Process parameters for the layers and preparation

The present disclosure is based on the above-mentioned provided absorbent core 1, and the preparation device and the preparation method thereof, and the detailed structure of the absorbent core 1, the preparation device and the preparation method thereof have been described in detail in the foregoing, and are not repeated herein. The performance of the absorbent core 1 of the present disclosure is explained in detail below in a specific test manner in connection with three test contents.

First to ensure the validity of the test data, the present disclosure provides six test samples. Each test sample was prepared using the preparation apparatus and preparation method as described above, and specifically, six test samples were prepared using the same preparation method.

The test samples 1 to 6 each have two types of fiber layers 2 different in water absorption strength, which are respectively referred to as a first fiber layer 2 and a second fiber layer 2. Specifically, the first fiber layer 2 of the test samples 1 to 6 had a grammage of 60g/1 ² (grams per square meter), the second fibrous layer 2 has a grammage of 120g/1 ² (grams per square meter).

Wherein test samples 1 to 2 are control test samples. Specifically, the first fiber layer 2 and the second fiber layer 2 of the test sample 1 are prepared from raw materials containing 5% of hydrophilic master batch and 95% of polypropylene. The first fiber layer 2 and the second fiber layer 2 of the test sample 2 were prepared from raw materials containing 10% of hydrophilic master batch and 90% of polypropylene.

In the test sample 3, the material of the first fiber layer 2 contains 5% of hydrophilic master batch and 95% of polypropylene, and the material of the second fiber layer 2 contains 10% of hydrophilic master batch and 90% of polypropylene.

In the test sample 4, the material of the first fiber layer 2 contains 10% of the hydrophilic master batch and 90% of the polypropylene, and the material of the second fiber layer 2 contains 5% of the hydrophilic master batch and 95% of the polypropylene.

In the test sample 5, the material of the first fiber layer 2 contains 5% of hydrophilic master batch and 95% of polypropylene, and the material of the second fiber layer 2 contains 10% of hydrophilic master batch and 90% of polypropylene. Test sample 5 was the same material as test sample 3.

In the test sample 6, the material of the first fiber layer 2 contains 10% of the hydrophilic master batch and 90% of the polypropylene, and the material of the second fiber layer 2 contains 5% of the hydrophilic master batch and 95% of the polypropylene. Test sample 6 was the same material as test sample 4.

Wherein, the test samples 3 and 4 are prepared by two melt-blowing machines 5 at the same time, and the

test samples

5 and 6 are prepared by one melt-blowing machine 5.

Specifically, whether one melt-blowing machine 5 or two melt-blowing machines 5 are used for preparation, the first fiber layer 2 is laid on the net curtain 61, then the net curtain 61 conveys the first fiber layer 2 to the position where the second fiber layer 2 is laid, and the melt-blowing machine 5 directly lays the second fiber layer 2 on the first fiber layer 2 to form the composite fiber layer 2.

Test 1

At the same position of the same test sample, when the instrument 'test' button is clicked at the 01 th in, the 51 st in and the 91 st in, 1l (5.0 + 0.1) of standard synthetic test solution can be automatically discharged by the instrument, and a laboratory technician observes and records the corresponding time value of the instrument display screen. The time values respectively represent the first absorption time, the second absorption time and the third absorption time of the test sample, and two decimal places are reserved for the result of the specific test dusting device. To test the wicking speed of the test sample.

Test 2

Clicking a 'test' button of the instrument on the same part of the same test sample, automatically discharging (5.0.1 soil) 1l of standard synthetic test solution by the instrument, automatically stopping discharging after 60s, flatly paving the test sample on a test bed, and pressing the test sample by a 1200g weight for 21in after 11 in. Then, 6 layers of filter paper (filter paper having a size of 10c1 to 10c1 and a mass of M) prepared in advance were used ₁ ) Placed on the test specimen.The test specimen covered with the filter paper was pressed with a 1200g weight for 30 seconds. The pressed filter paper was removed, and the mass was recorded as (M) by aligning weighing ₂ ). By calculating M ₂ And M ₁ The difference between the two can be used to calculate the reverse osmosis condition of the test sample. The smaller the difference, the drier the surface of the test specimen and the smaller the reverse osmosis amount.

Test 3

The mass of the test sample (pre-suction mass) was weighed with a balance having a sensory amount of 0.01 g. Clamping one end of the test sample by using a clamp, immersing the test sample together with the clamp into distilled water or deionized water at the temperature of 23 +/-1 ℃, and enabling the side with weaker water absorption strength of the test sample to face upwards so as to be completely immersed for 60s. And then lifting the clamp to enable the test sample to be completely separated from the water surface, vertically hanging for 90s, removing the clamp, weighing the mass (mass after absorption) of the test sample after absorption, and calculating the absorption rate of the test sample according to the formula (1).

The test samples 1 to 6 in this example were tested according to the test methods described in the above three examples, and the specific process parameters and test result data are shown in table 3.

Table 3 process parameters and test results for absorbent core 1

As can be seen from the analysis of table 3, the test sample 3 prepared by the plurality of meltblowing machines 5 has a higher absorption capacity (8.27 times) than the test sample 4 (8.05 times), and the test sample 3 has a lower first-order reverse osmosis amount (0.29 g) than the test sample 4 (0.46 g), and the absorption rate is significantly slower than that of the test sample 4, mainly because the fiber layer 2 having a weaker water absorption strength is located above the fiber layer 2 having a stronger water absorption strength.

The same test sample 5 prepared from a single meltblower 5 had a higher absorbency (8.13 times) than test sample 6 (8.04 times), while the test sample 5 had a lower first rewet (0.35 g) than test sample 6 (0.48 g) and the rate of absorbency was significantly slower than test sample 6.

In addition, the

test samples

3 and 5 also had a smaller reverse osmosis amount than the test samples 1 and 2. The smaller the reverse osmosis value is, the drier the surface of the absorbent core 1 is, which also means that the absorbent core 1 provided by the present disclosure has better one-way moisture-transfer function, can rapidly absorb liquid, and keeps the absorbent core 1 dry close to the human body, thereby ensuring the comfort of the user.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. An absorbent core, comprising:

the absorption core body (1) comprises at least two fiber layers (2) with different water absorption strengths, and the at least two fiber layers (2) are sequentially laminated and combined and are constructed in a way that the water absorption strength gradually increases from the side close to the human body to the side far away from the human body.

2. Absorbent core according to claim 1, wherein the absorbent core (1) comprises at least two fibrous layers (2) made of different raw materials, and the absorbent core (1) is configured such that the absorbent strength increases gradually from the side close to the human body to the side away from the human body.

3. The absorbent core according to claim 2, wherein the fibrous layer (2) is prepared by melt-blowing, the fibrous layer (2) being prepared from a material comprising a mixture of melt-blown pellets and a hydrophilic modifier;

the preparation raw materials of the fiber layer (2) also comprise antibacterial master batches.

4. The absorbent core according to claim 1, wherein said absorbent core (1) comprises at least two said fibrous layers (2) having different web structures, and said absorbent core (1) is configured such that the fineness of the fibers is gradually reduced from the side close to the body to the side away from the body, the fiber bulkiness is gradually increased, and the water absorption strength is gradually increased.

5. The absorbent core according to claim 4, wherein the fibrous layer (2) is configured to be prepared by a melt-blowing process and has an irregular distribution of fibrous pores.

6. Absorbent core according to claim 5, characterized in that the fibrous layer (2) of the at least two fibrous layers (2) having the lower water absorption strength comprises 93.5 to 97% melt-blown pellets, 3 to 5% hydrophilic masterbatch, 0 to 1.5% antimicrobial masterbatch, a fiber fineness of 2 to 10m and a layer weight of 30 to 100g/m ² ；

The fiber layer (2) with higher water absorption strength in the at least two fiber layers (2) comprises 87 to 94 percent of melt-blown granules, 6 to 10 percent of hydrophilic master batch and 0 to 3 percent of antibacterial master batch, the fiber fineness is 1 to 5m, and the layer weight is 50 to 180g/m ² 。

7. An apparatus for preparing an absorbent core (1) using the absorbent core (1) according to any one of claims 1 to 6, the apparatus comprising:

a melt-blowing machine (5), wherein the melt-blowing machine (5) is configured to prepare fiber layers (2) with different water absorption strengths and lay the prepared fiber layers (2) on a net curtain (61);

a conveying device (6), wherein the conveying device (6) comprises a net curtain (61) and an air suction device (62), and the net curtain (61) is configured to move between the melt-blowing machine (5) and a winding device (7) under a melt-blowing die head (54) of the melt-blowing machine (5).

8. The apparatus for manufacturing an absorbent core according to claim 7, further comprising,

a fan (57) arranged below the net curtain (61), connected with a suction device (62) and configured to be used for the fiber layer (2) sprayed by the melt-blowing machine (5) to be attached to the net curtain (61);

a winding device (7), wherein the winding device (7) is configured to convey the fiber layers (2) laid on the net curtain (61), and the fiber layers (2) with different water absorption strengths are bonded, embossed and cut to form the absorption core body (1).

9. The apparatus for producing an absorbent core according to claim 7, comprising at least two said meltblowing machines (5), at least two said meltblowing machines (5) being configured to produce said fibrous layers (2) having different water absorption strengths, respectively.

10. The apparatus for the preparation of an absorbent core according to claim 7, characterized in that it further comprises a dusting device (8) between the melt-blowing machine (5) and the winding device (7), the dusting device (8) being configured to apply powder on the layer of higher water absorption strength fibers (2);

the powder is super absorbent resin powder.

11. A method for producing an absorbent core using the absorbent core according to any one of claims 1 to 6, comprising the steps of:

preparing at least two fiber layers (2) with different water absorption strengths, wherein the at least two fiber layers (2) are configured to gradually increase the water absorption strength from the side close to the human body to the side far away from the human body.

12. The method for producing an absorbent core according to claim 11, wherein the absorbent strength of the fibrous layer (2) is changed by adjusting a raw material for producing the fibrous layer (2) such that the absorbent core (1) is configured to gradually increase from a side close to a human body to a side away from the human body.

13. The method for preparing the absorbent core according to claim 11, wherein at least two fiber layers (2) are prepared by a melt-blowing method, and the water absorption strength of the fiber layers (2) is changed by adjusting the preparation parameters of a melt-blowing machine (5), so that the absorbent core (1) is configured to gradually become thinner in fiber fineness, gradually become tighter in fiber bulkiness and gradually increase in water absorption strength from the side close to the human body to the side far away from the human body.

14. A method of making an absorbent core according to claim 13, wherein the manufacturing parameters include: the distance from the orifice outlet of the meltblowing die (54) to the receiving screen (61), the power of an air compressor (55), the power of an air heater (56), and/or the temperature of the zones of the screw extruder (51).