CN112972118B

CN112972118B - Preparation method of composite absorption core body capable of conducting infiltration rapidly

Info

Publication number: CN112972118B
Application number: CN202011475724.3A
Authority: CN
Inventors: 许昌荣
Original assignee: Fujian Lansiber Sanitary Products Co ltd
Current assignee: Fujian Lansiber Sanitary Products Co ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2023-07-25
Anticipated expiration: 2040-12-14
Also published as: CN112972118A

Abstract

The invention relates to a preparation method of a quick-conduction infiltration composite absorption core body, which comprises a first swelling paper layer, a first high-hydroscopicity resin layer, a swelling non-woven fabric layer, a second high-hydroscopicity resin layer and a second swelling paper layer from top to bottom, wherein the layers are sequentially overlapped and connected, and the swelling non-woven fabric layer is prepared through the following process steps: step 1, cutting a fluffy non-woven fabric layer into a plurality of fluffy non-woven fabric strips after the fluffy non-woven fabric layer is put on a machine; step 2, adjusting the stretching force after slitting to stretch and narrow each fluffy non-woven fabric strip, wherein the width ratio is 60% -80%, and the transverse width of the fluffy non-woven fabric layer is synchronously narrowed, so that flow guiding penetration through holes are formed between the stretched fluffy non-woven fabric strips; the diversion penetration through hole directly conducts the first swelling paper layer and the second swelling paper layer, increases the liquid diffusion length, the core utilization rate and the dryness, and forms a concave shape suitable for the crotch position.

Description

Preparation method of composite absorption core body capable of conducting infiltration rapidly

Technical Field

The invention belongs to the field of absorbent products, and particularly relates to a composite absorbent core capable of conducting infiltration rapidly and a preparation method thereof.

Background

The invention relates to a production process for leading a core to have a flow guiding effect by modifying a production process of a composite core, wherein the absorbent core of sanitary articles in domestic market in the current stage is mainly a five-layer composite core, wood pulp macromolecule cores (traditional cores) have larger problems in the aspects of core strength and dryness, but the composite core has larger defects in the current stage because of the limitations of macromolecule distribution and material conductivity, and the absorption of liquid cannot be fully utilized only by virtue of the material and the permeability of the macromolecule, and the low utilization rate of the absorbent core is the larger defect of the composite core in the current stage.

Disclosure of Invention

In order to overcome the problems of low utilization rate and dryness of a composite absorption core caused by insufficient diversion permeation effect in the prior art and the problem that the crotch of an infant is forcibly spread when the composite absorption core is saturated and absorbed, and O-shaped legs are easily damaged to the infant, the invention provides a composite absorption core capable of conducting downward permeation rapidly and a preparation method thereof, and the composite absorption core is realized by the following technical scheme:

in order to achieve the effects of rapid permeation and rapid conduction, the invention provides a rapid-conduction downward-permeation composite absorption core body, which comprises a first swelling paper layer, a first super absorbent resin layer, a fluffy non-woven fabric layer, a second super absorbent resin layer and a second swelling paper layer from top to bottom, wherein the layers are sequentially overlapped and connected. Wherein the fluffy nonwoven layer is prepared by the following process steps:

step 1, cutting the fluffy non-woven fabric layer into fluffy non-woven fabric strips after being put on a machine:

slitting the fluffy nonwoven layer (third layer) along the width (transverse direction) of the fluffy nonwoven layer, so that the fluffy nonwoven layer is slit into a plurality of fluffy nonwoven strips arranged along the width (transverse direction), and two ends of each fluffy nonwoven strip extend along the length (longitudinal direction) of the fluffy nonwoven strip.

Step 2, adjusting the stretching force after slitting to stretch and narrow each fluffy non-woven fabric strip:

and applying a certain stretching force to the two longitudinal ends of each fluffy non-woven fabric strip, so that the fluffy non-woven fabric strips are stretched and deformed under the action of the stretching force, flow guiding penetrating through holes naturally exist between the stretched fluffy non-woven fabric strips, and the transverse width of the fluffy non-woven fabric layers is synchronously narrowed.

In embodiments the stretching forces of two adjacent bulky nonwoven strips may be the same, but in other embodiments the stretching forces of two adjacent bulky nonwoven strips may be different. Such as:

specifically, when the number of the fluffy non-woven fabric strips is 2, the same stretching force is respectively applied to the two longitudinal ends of each fluffy non-woven fabric strip, so that each fluffy non-woven fabric strip deforms and narrows in the width direction (namely contracts inwards towards the central direction of the fluffy non-woven fabric strips), and a diversion penetration through hole for rapid conduction and infiltration is formed between the fluffy non-woven fabric strips.

Specifically, when the fluffy nonwoven strips are 3, the fluffy nonwoven strips positioned in the longitudinal central line area are taken as reference fluffy nonwoven strips, reference stretching force is respectively applied to two longitudinal ends of the reference fluffy nonwoven strips, and the stretching force of the fluffy nonwoven strips positioned at two sides of the fluffy nonwoven layers is increased or reduced relative to the reference stretching force, so that each fluffy nonwoven strip deforms and narrows in the width direction (namely inwards contracts towards the central direction of the fluffy nonwoven strips), and a diversion penetration through hole for rapid conduction and infiltration is formed between every two adjacent fluffy nonwoven strips.

Specifically, when the fluffy nonwoven strips are more than 5, the fluffy nonwoven strips in the longitudinal central line area are used as reference fluffy nonwoven strips, reference stretching force is respectively applied to two longitudinal ends of the reference fluffy nonwoven strips, meanwhile, stretching force is respectively applied to two longitudinal ends of each fluffy nonwoven strip positioned on two sides of the reference fluffy nonwoven strips in the width direction, but the stretching force is based on the reference stretching force and sequentially increases or decreases along the side boundary direction of the fluffy nonwoven layers, and each fluffy nonwoven strip is deformed and narrowed (namely, is contracted inwards towards the center direction of the fluffy nonwoven strips) to different degrees in the width direction by a stepped stretching force relation, so that a flow guiding penetrating through hole for rapid conduction and infiltration is formed between every two adjacent fluffy nonwoven strips.

According to the invention, the fluffy non-woven fabric layer is cut, and the process steps of increasing and decreasing the stretching force to form a stepped stretching force relationship are adopted, so that the fluffy non-woven fabric strip generates larger deformation, and the fluffy non-woven fabric layer is synchronously narrowed, so that a natural dividing groove, namely a diversion penetration through hole, is formed in the core body.

In a specific embodiment, the stretching force is achieved by: i.e. by adjusting the different linear velocities of the bulky nonwoven strip to set different said stretching forces, such as: the method comprises the steps of adjusting different linear speeds of a reference fluffy non-woven fabric strip and fluffy non-woven fabric strips positioned on two sides of the reference fluffy non-woven fabric strip, and specifically comprises the following steps:

and a step a, setting a reference linear velocity for the reference fluffy non-woven fabric strip.

And b, taking the reference linear velocity as a reference, and sequentially increasing or decreasing the linear velocity of each fluffy non-woven fabric strip positioned on two sides of the reference fluffy non-woven fabric strip in the width direction along the side boundary direction of the fluffy non-woven fabric layer, namely stretching and narrowing at a differential speed, so that a stepped linear velocity relationship is formed from the reference fluffy non-woven fabric strip to the measured boundary of the fluffy non-woven fabric layer.

And c, deforming and narrowing each fluffy non-woven fabric strip in the width direction by the linear speed, and forming the diversion penetration through holes between two adjacent fluffy non-woven fabric strips through a stepped linear speed relationship.

Specifically, the reference linear velocity and the linear velocity are expressed as a percentage of the stretched and narrowed width of the bulky nonwoven fabric strip relative to the initial width (unstretched and narrowed width) of the bulky nonwoven fabric strip, and the ratio of the width is 60% to 80%, and further preferably 70% to 80%.

The diversion permeation through holes enable the diversion effect of the composite absorption core body to be greatly improved. The diversion penetration through holes enable the diffusion of the core body to be greatly improved, so that the absorption speed, the plane absorption performance and the U-shaped pressurized absorption performance of the core body are remarkably improved.

Under the effect of the flow-guiding permeation through holes, the blocking effect of the fluffy non-woven layer on the liquid in the diffusion and permeation processes of the composite absorption core body is avoided, the flow-guiding permeation through holes are larger gaps, the first puffing paper layer (first structural layer) and the second puffing paper layer (fifth structural layer) of the composite absorption core body are directly conducted, and therefore surface liquid can quickly permeate into the second puffing paper layer through the gaps, and the liquid can quickly permeate.

Meanwhile, under the action of the diversion permeation through holes, liquid can be quickly conducted to two sides along the gap diversion permeation through holes, so that the diffusion length is increased, the utilization rate of the composite absorption core body is increased, and the dryness of the surface is improved.

In addition, because the diversion permeation through hole presents a gap-shaped long slit or a long cutting groove, the folding performance is better, after the composite absorption core body is saturated to absorb liquid, the two longitudinal side edges of the composite absorption core body can be respectively folded along the diversion permeation through hole towards the longitudinal center direction, so that the composite absorption core body forms a concave shape suitable for a crotch position, such as a V shape or a U shape, and the leg of a user is prevented from being spread, and the leg of the user is prevented from being rubbed. The method comprises the following steps:

(1) When the fluffy non-woven layer is only provided with one gap, namely, when the fluffy non-woven layer is split into two parts, the crotch part of the liquid suction back forms a V shape;

(2) Or when the fluffy nonwoven layer has only two gaps, the crotch position of the liquid absorption back forms a U shape.

The concave shape of the fit body avoids the situation that when saturated absorption occurs, the composite absorption core body presents a plump cuboid, the crotch of the baby is spread by strong line, the crotch of the baby is spread for a long time, and O-shaped legs are easily caused for the baby.

The beneficial effects achieved by the invention are as follows:

firstly, the fluffy non-woven fabric layer is cut, and the process steps of increasing and decreasing the stretching force to form a stepped stretching force relationship are adopted, so that the fluffy non-woven fabric strip generates larger deformation, and the fluffy non-woven fabric layer is synchronously narrowed, so that a cutting groove, namely a diversion penetration through hole, is formed in the core body.

Secondly, the diversion permeation through holes enable the diversion effect of the composite absorption core body to be greatly improved. Under the effect of the flow-guiding permeation through holes, the blocking effect of the fluffy non-woven layer on the liquid in the diffusion and permeation processes of the composite absorption core body is avoided, the flow-guiding permeation through holes are larger gaps, the first puffing paper layer (first structural layer) and the second puffing paper layer (fifth structural layer) of the composite absorption core body are directly conducted, and therefore surface liquid can quickly permeate into the second puffing paper layer through the gaps, and the liquid can quickly permeate.

And under the action of the diversion permeation through holes, liquid can be quickly conducted to two sides along the gap diversion permeation through holes, so that the diffusion length is increased, the utilization rate of the composite absorption core body is increased, and the dryness of the surface is improved.

Finally, the diversion permeation through hole is clearance form, and the foldability is better, when the compound absorption core body absorbs more urine, can appear fitting concave shape in crotch position, specifically does: when the fluffy nonwoven layer only has one gap, namely when the fluffy nonwoven layer is split into two parts, the liquid-absorbing rear crotch position forms a V shape, or when the fluffy nonwoven layer only has two gaps, the liquid-absorbing rear crotch position forms a U shape, so that the composite absorption core body presents a plump cuboid when saturated absorption is avoided, the crotch of a baby is forced to be spread, and the long-time crotch is spread, and O-shaped legs are easily caused to the baby.

Drawings

FIG. 1 is a schematic structural view of a composite absorbent core that can be rapidly conductive and downed.

Figure 2 is a schematic illustration of slitting of a lofty nonwoven layer.

FIG. 3 is a schematic illustration of a slit differential stretch narrowing structure of a lofty nonwoven layer.

Fig. 4 is a schematic structural view of the diversion penetration through-hole of example 1.

Fig. 5 is a schematic structural diagram of the diversion penetration through-hole of example 2.

Fig. 6 is a schematic structural diagram of the diversion penetration through-hole of example 3.

FIG. 7 is a schematic cross-sectional structure of a composite absorbent core that can be rapidly conductive downed.

Fig. 8 is a schematic structural view of a rapidly conductive absorbent diaper.

Figure 9 is a schematic view of the U-shape of the composite absorbent core after saturated wicking.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear and obvious, the invention is further described in detail below with reference to the attached drawings and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1-9, the rapid-conduction downward-penetrating composite absorbent core of the present invention has the following structure: the composite absorption core body 1 comprises a first swelling paper layer 11, a first super absorbent resin layer 12, a fluffy non-woven layer 13, a second super absorbent resin layer 14 and a second swelling paper layer 15 from top to bottom, and the layers are sequentially overlapped and connected to form the composite absorption core body, and the composite absorption core body is structurally characterized in that:

one of the bulk nonwoven layers 13 is composed of more than 2 bulk nonwoven strips, for example, the bulk nonwoven strips may be 2, 3, 4, 5 or 6, preferably 2, 3 or 5.

Secondly, a gap-shaped long slit or a long groove-shaped diversion penetration through hole is arranged between two adjacent fluffy non-woven fabric strips, so that the fluffy non-woven fabric layer has better foldability.

Thirdly, after the composite absorption core body is saturated to absorb liquid, two longitudinal side edges of the composite absorption core body can be folded along the diversion permeation through holes to the longitudinal center direction respectively, so that the composite absorption core body forms a concave shape suitable for a crotch position, such as a V shape or a U shape, and the legs of a user are prevented from being unfolded and friction with the legs of the user is also prevented.

The method comprises the following steps:

The rapid conduction and infiltration absorption core is prepared through the following process steps:

step 1, cutting the fluffy non-woven fabric layer 13 into fluffy non-woven fabric strips after being put on a machine:

the bulky nonwoven layer 13 (third layer) is slit in the width (transverse) direction thereof, for example, the bulky nonwoven layer 13 is slit into bulky nonwoven strips 131, 132, 133, 134, 135, 136 and 137 arranged in the width (transverse) direction, each of which has both ends extending in the length (longitudinal) direction thereof.

In particular embodiments the stretching forces of two adjacent bulky nonwoven strips may be the same, such as: when the fluffy non-woven fabric strips are 2, the same stretching force is respectively applied to the two longitudinal ends of each fluffy non-woven fabric strip, so that each fluffy non-woven fabric strip deforms and narrows in the width direction (namely, contracts inwards towards the center direction of the fluffy non-woven fabric strip), and a diversion penetration through hole for rapid conduction and infiltration is formed between the fluffy non-woven fabric strips.

In other embodiments, however, the stretching forces of two adjacent bulky nonwoven strips are different, as is:

when the fluffy nonwoven strips are 3, the fluffy nonwoven strips positioned in the longitudinal central line area are taken as reference fluffy nonwoven strips 13b, reference stretching force is respectively applied to the two longitudinal ends of the reference fluffy nonwoven strips, the stretching force of the fluffy nonwoven strips 13a and the fluffy nonwoven strips 13c positioned at the two sides of the reference fluffy nonwoven layers is increased or reduced relative to the reference stretching force, each fluffy nonwoven strip is deformed and narrowed in the width direction (i.e. is contracted inwards towards the central direction of the fluffy nonwoven strip), so that a quick-conduction downward-seepage diversion permeation through hole 101 is formed between the fluffy nonwoven strips 13a and the reference fluffy nonwoven strips 13b, and a quick-conduction downward-seepage diversion permeation through hole 102 is formed between the fluffy nonwoven strips 13c and the reference fluffy nonwoven strips 13 b.

In addition, the bulky nonwoven layer 13 may be slit into 5 or more bulky nonwoven strips. When the two fluffy nonwoven strips are split into 5 fluffy nonwoven strips, the fluffy nonwoven strips positioned in the longitudinal central line area are taken as reference fluffy nonwoven strips, reference stretching force is respectively applied to the two longitudinal ends of the reference fluffy nonwoven strips, meanwhile, stretching force is respectively applied to the two longitudinal ends of each fluffy nonwoven strip positioned at the two sides of the reference fluffy nonwoven strips in the width direction, but the stretching force is based on the reference stretching force and sequentially increases or decreases along the side boundary direction of the fluffy nonwoven layers, and each fluffy nonwoven strip is deformed and narrowed (namely, is contracted inwards towards the center direction of the fluffy nonwoven strip) to different degrees in the width direction by a stepped stretching force relation, so that a diversion permeation hole for rapid conduction infiltration is formed between every two adjacent fluffy nonwoven strips.

The invention cuts the fluffy non-woven fabric layer, adopts the process steps of increasing and decreasing the stretching force to form a stepped stretching force relationship, so that the fluffy non-woven fabric strip generates larger deformation, and synchronously narrows the fluffy non-woven fabric layer, thereby forming a natural dividing groove, namely a diversion penetration through hole (a gap-shaped long slit or a long cutting groove) in the core body.

Taking a fluffy non-woven fabric with the square gram weight of 42g as an example, the shrinkage rate of the fluffy non-woven fabric after being put on a machine is about 10 percent due to the tensile force of a machine table, namely the fluffy non-woven fabric with the width of one meter is required to be equipped with the fluffy non-woven fabric with the width of 1.12m, the practical size of the fluffy non-woven fabric after being retracted is about 1.03m, the width of a single-length slot is about 15mm in order to ensure that the width of the double-length slot reaches about 10mm after being cut, and the longitudinal tensile force of raw materials is required to be adjusted to be between 25 and 30N/m (namely the tensile force of the fluffy non-woven fabric with the width of one meter is 25N), so that the width of the fluffy non-woven fabric can be narrowed by 15 to 20 percent, for example: taking the middle of the 105mm core body as the reference, and stretching the fluffy non-woven fabric by a machine table to form the following structure: 30mm fluffy non-woven fabric strips-10 mm gaps-25 mm fluffy non-woven fabric strips-10 mm gaps-30 mm fluffy non-woven fabric strips. Thus, the width of the lofty nonwoven web is narrowed by a higher percentage or magnitude by adjusting the machine direction stretching force.

In particular embodiments, to facilitate production control and handling, the stretching force is achieved by: i.e. by adjusting the different linear velocities of the bulky nonwoven strip to set different said stretching forces, such as: the method comprises the following steps of adjusting different linear speeds of a reference fluffy non-woven fabric strip and fluffy non-woven fabric strips positioned on two sides of the reference fluffy non-woven fabric strip, wherein the specific steps are as follows:

Specifically, the reference linear velocity and the linear velocity are expressed in terms of a width ratio, that is: the ratio of the width of the bulky nonwoven fabric strip after stretching and narrowing is expressed as a percentage of the original width (unstretched and narrowed width) of the bulky nonwoven fabric strip, and is preferably from 60% to 80%, more preferably from 70% to 80%.

Specific embodiments of the flow-guiding and penetrating through-holes of the bulky nonwoven layer and the slit-like long slits or long slits are described below by way of examples.

Example 1

In this example, the bulky nonwoven layer 13 was slit into 3 bulky nonwoven strips. Wherein, the fluffy non-woven fabric strip positioned in the longitudinal central line area is taken as a reference fluffy non-woven fabric strip 13b, and reference stretching force is respectively applied to the two longitudinal ends of the reference fluffy non-woven fabric strip, and the stretching force is realized by adjusting the linear velocity so that the fluffy non-woven fabric strip generates deformation and narrowing percentage in the width direction. The method comprises the following specific steps:

step 1, a reference linear velocity of the reference bulky nonwoven fabric 13b was set, and the width ratio thereof was 80%.

Step 2, setting the fluffy non-woven strips 13a and 13c positioned on two sides of the reference fluffy non-woven strip, and adjusting the linear speed to ensure that the width ratio is 80%.

Through the differential stretching and narrowing, the fluffy non-woven fabric strip 13a generates larger deformation with reference to the fluffy non-woven fabric strip 13b and the fluffy non-woven fabric strip 13c, the fluffy non-woven fabric strip 13a, the reference between the fluffy non-woven fabric strips 13b and the fluffy non-woven fabric strip 13c generate deformation and narrowing with the same proportion in the width direction, and the fluffy non-woven fabric layers are synchronously narrowed, so that a gap-shaped long slit or long slot is formed inside the core body, namely the diversion penetration through holes 101 and 102 are formed between two adjacent fluffy non-woven fabric strips.

The diversion permeation through holes 101 and 102 greatly improve the diversion effect of the composite absorption core body 1. The diversion permeation through holes 101 and 102 greatly improve the diffusion of the composite absorption core body 1, and the composite absorption core body 1 capable of conducting downward permeation rapidly is obtained, the absorption speed, the plane absorption performance and the U-shaped pressurized absorption performance of the composite absorption core body 1 are obviously improved, and the absorption performance is shown in tables 1, 2 and 3 respectively.

Example 2

In this embodiment, deformation and narrowing of different proportions are generated in the width direction between the bulk nonwoven fabric strips 13a, the reference bulk nonwoven fabric strip 13b, and between the reference bulk nonwoven fabric strips 13b and 13c, so that a stepped linear velocity relationship is formed between the reference bulk nonwoven fabric strip and the measurement boundary of the bulk nonwoven fabric layer. Therefore, the present embodiment differs from embodiment 1 only in that the present embodiment is set differently for the reference linear velocity of the reference bulky nonwoven fabric 13b, the ratio of the widths (linear velocity) of the bulky nonwoven fabric strips 13a, 13c located on both sides of the reference bulky nonwoven fabric strip.

And 2, setting linear speeds of the fluffy non-woven fabric strips 13a and 13c, wherein the width ratio is 60%.

The diversion permeation through holes 103 and 104 greatly improve the diversion effect of the composite absorption core body. The diversion permeation through holes 103 and 104 greatly improve the diffusion of the composite absorption core body, so that the composite absorption core body capable of conducting downward permeation rapidly is obtained, the absorption speed, the plane absorption performance and the U-shaped pressurized absorption performance of the composite absorption core body are obviously improved, and the absorption performance is shown in tables 1, 2 and 3 respectively.

Example 3

The present embodiment differs from embodiment 1 only in that the present embodiment is set differently for the reference linear velocity of the reference bulky nonwoven fabric strip, the ratio of the widths (linear velocity) of the bulky nonwoven fabric strips located on both sides of the reference bulky nonwoven fabric strip.

And 2, setting linear speeds of the fluffy non-woven fabric strips 13a and 13c, wherein the width ratio is 70%.

The diversion permeation through holes 105 and 106 greatly improve the diversion effect of the composite absorption core body. The diversion permeation through holes 105 and 106 greatly improve the diffusion of the composite absorption core body, and the composite absorption core body capable of conducting downward permeation rapidly is obtained, the absorption speed, the plane absorption performance and the U-shaped pressurized absorption performance of the composite absorption core body are obviously improved, and the absorption performance is shown in tables 1, 2 and 3 respectively.

Example 4

This example provides a baby diaper (disposable absorbent article) using the composite absorbent core capable of rapid conduction and downward permeation prepared in example 1, the baby diaper comprising a liquid-permeable top sheet 2, a liquid-impermeable back sheet 4, and the composite absorbent core 1 capable of rapid conduction and downward permeation therebetween and the leakage preventing barrier 3 on both sides of the composite absorbent core 1. In addition, the composite absorbent core 1 may also be covered with a wrapping layer 16.

The composite absorption core body 1 of the baby diaper of the embodiment comprises a first swelling paper layer, a first high water absorption resin layer, a fluffy non-woven layer, a second high water absorption resin layer and a second swelling paper layer from top to bottom, and the layers are sequentially overlapped and connected to form the composite absorption core body, which is structurally characterized in that: the fluffy nonwoven layer 13 is provided with flow guiding permeation through holes 101 and 102 which can quickly conduct downward permeation, the flow guiding permeation through holes 101 and 102 are long slits or long slots in a gap shape, the first puffing paper layer and the second puffing paper layer are directly conducted, and meanwhile, after the composite absorbent core body 1 is saturated to absorb liquid, the composite absorbent core body can be folded at the crotch part to form a concave shape suitable for a human body.

The diversion penetration through holes 101, 102 of the present embodiment are realized by the following steps:

1) The bulky nonwoven layer 13 is slit in the width direction thereof, thereby dividing the bulky nonwoven layer into 3 bulky nonwoven strips arranged in the width direction, and both ends of each of the bulky nonwoven strips extend in the length direction thereof.

2) And applying a certain stretching force to the two longitudinal ends of each fluffy non-woven fabric strip, so that the fluffy non-woven fabric strips are stretched and deformed under the action of the stretching force, the width ratio of the fluffy non-woven fabric strips is 80%, the transverse width of the fluffy non-woven fabric layers is synchronously narrowed, and flow guide penetrating through holes 101 and 102 are formed between the stretched fluffy non-woven fabric strips.

The diversion permeation through holes 101 and 102 of the present embodiment can significantly improve the absorption speed, the plane absorption performance and the U-shaped pressurized absorption performance of the baby diaper, and the absorption performance is shown in table 4 and table 5, respectively.

Example 5

This example provides a baby diaper (disposable absorbent article) using the composite absorbent core capable of rapid conduction and downward permeation manufactured in example 2, and is different from example 4 only in that the bulk nonwoven strips 13b located in the longitudinal center region have a width ratio of 80%, and the bulk nonwoven strips 13a, 13c located on both sides have a linear velocity of 60% and form the flow-guiding permeation through holes 103, 104.

The diversion permeation through holes 104 and 105 of the embodiment can significantly improve the absorption speed, the plane absorption performance and the U-shaped pressurized absorption performance of the baby diaper, and the absorption performance is shown in table 4 and table 5 respectively.

Example 6

This example provided a baby diaper (disposable absorbent article) using the composite absorbent core capable of rapid conduction and downward permeation manufactured in example 3, and was different from example 4 only in that the bulk nonwoven strips 13b located in the longitudinal center region had a width ratio of 80%, and the bulk nonwoven strips 13a, 13c located on both sides had linear velocities of 70%, and the flow-guiding permeation through holes 105, 106 were formed.

The absorbency of this example is shown in tables 4 and 5.

Performance test:

1. sample:

(1) Composite absorbent core capable of rapid conduction and infiltration: the test samples and the comparative samples used a superabsorbent resin (SAP), a bulky nonwoven layer, and a cover layer (bulked paper), all commercially available, which differ only in that: the fluffy nonwoven layer in the test sample is the fluffy nonwoven fabric formed by slitting and differential stretching and narrowing the test sample, and the fluffy nonwoven layer in the comparison sample is the fluffy nonwoven fabric applied in the prior art, namely the fluffy nonwoven fabric is not subjected to the slitting and differential stretching and narrowing treatment.

(2) Babies' paper diaper (disposable absorbent article): the baby diapers (model number L) using the composite absorbent cores of examples 1, 2 and 3, respectively, which were quick-conductive and downward-permeable, were compared with the conventional baby diapers (model number L) on the market.

2. The testing method comprises the following steps:

(1) And (3) national standard test: the test was performed with reference to GB/T28004-2011 paper diapers (sheets, pads).

(2) Plane test:

and step 1, weighing 3 pieces of products with gram weights above and below the theoretical average value of the products, recording the quality of the products as M, and weighing two pieces of filter paper (about 3g of the lower layer and about 10g of the upper layer) with the quality of M1/M2.

And 2, wetting the national standard funnel with a test solution for two times, fixing the funnel on a bracket, and adjusting the lower opening of the funnel to face an operator, wherein the vertical distance between the center point of the lower opening and the surface of the sample is 5mm-10mm.

And 3, placing filter paper with known mass M1 on the adhesive plate, spreading and flatly spreading the diaper sample on the adhesive plate (pressing the filter paper), removing the leakage-proof isolation edge by using scissors, and flattening the diaper surface layer to prevent wrinkles.

And step 4, taking 100ml of pigment-added 0.9% normal saline test solution by using a measuring cylinder, regulating the flow rate of a special standard discharge funnel, pouring the test solution into the funnel, and starting timing at the same time, wherein the total liquid absorption completion time is the first absorption speed T1.

And 5, when the time is 5 minutes, adding liquid for the second time, and repeating the operation steps, wherein the time for completing the whole absorption of the second liquid is the second absorption speed T2.

And 6, in the 10 th minute, taking M2 filter paper with known mass, placing the filter paper in the middle, pressing the filter paper with 3.5kg of pressing blocks, collecting the pressing blocks after 1 minute, taking out and weighing the upper and lower layers of filter paper with known mass, recording the lower layer of data as M3, the upper layer as M4, and testing the diffusion length of the product as L (the length is the average value).

And 7, recording and calculating secondary plane liquid adding test data of the product, wherein the product quality M, the first absorption speed is T1, the second absorption speed is T2, the rewet amount is M4-M2, the leakage amount is M3-M1, and the diffusion length is L.

(3) U-shaped test:

and 1, selecting 3 products with gram weights above and below a theoretical mean value, weighing the products with the mass of M, making marks at the liquid adding point of the center of the products, and weighing a proper amount of filter paper with the mass of M1.

And 2, adhering the product on a U-shaped groove, and fixing the funnel on the bracket, wherein the vertical distance between the center point of the lower opening and the surface of the sample is 5-10 mm.

And 3, measuring 0.9% physiological saline at 23+/-1 ℃ by using a measuring cylinder, wherein the liquid adding amount is 80ML.

Step 4, pouring the test liquid into a special standard funnel after being well adjusted, and starting timing; the penetration (blotting) time is the product first absorption rate T1.

And 5, when the time is 5 minutes, adding liquid for the second time, and repeating the operation steps, wherein the infiltration (drying) time is the second absorption speed T2 of the product.

And 6, taking down the diaper after the test is completed in 9min for 30s, showing a natural bending condition, taking M1 filter paper with known mass out of the middle of the diaper in 10 min, and pressing the filter paper by using 1.2kg of a pressing block.

Step 7, collecting the pressed block after 11 minutes, weighing filter paper, and recording data as M2; the product was tiled and measured for diffusion length L (length is the mean value).

And 8, recording the gram weight of the product as M, the first absorption speed T1, the second absorption speed T2, the rewet amount M3=M2-M1 and the diffusion length as L.

The test results are shown in the following table.

TABLE 1 national standard test of absorption and diffusion Properties

TABLE 2 planar absorption and diffusion Properties of composite absorbent core

TABLE 3U-shaped absorption and diffusion Properties of composite absorbent core

TABLE 4 planar absorption and diffusion Properties of absorbent articles

Test item	Example 4	Example 5	Example 6	Comparative sample
					Absorption speed 1 st time(s)	12	13	12	14
Absorption speed(s) at time 2	32	28	30	46
					Rewet amount (g)	5.26	4.56	5.39	9.78
Front diffusion length (mm)	266	273	276	249
					Back diffusion length (mm)	301	321	312	262

TABLE 5U-shaped absorption and diffusion Properties of absorbent articles

Test item	Example 4	Example 5	Example 6	Comparative sample
					Absorption speed 1 st time(s)	32	30	28	42
Absorption speed(s) at time 2	31	32	33	51
					Rewet amount (g)	5.93	5.08	5.35	8.82
Front diffusion length (mm)	181	189	183	167
					Back diffusion length (mm)	221	243	235	212

Test results show that the composite absorbent core capable of conducting infiltration rapidly is a national standard test, a plane absorption test or a U-shaped absorption test, and the flow-guiding infiltration through holes formed by slitting and differential stretching and narrowing the fluffy nonwoven layer can increase the diffusion length of liquid, improve the utilization rate of the core, increase the liquid-discharging speed, improve the dryness of the product and improve the comprehensive performance of the product.

The reason is that under the action of the flow-guiding permeation through holes, the blocking effect of the fluffy non-woven fabric layer on the liquid in the diffusion and permeation processes of the composite absorption core body is avoided, the flow-guiding permeation through holes are larger gaps, the first puffing paper layer (first structural layer) and the second puffing paper layer (fifth structural layer) of the composite absorption core body are directly conducted, and therefore surface liquid can quickly permeate into the second puffing paper layer through the gaps, and the liquid can quickly permeate.

Because the compound absorption core that can ooze under the quick conduction of this application has above-mentioned absorption performance, consequently, when being applied to baby diaper with this compound absorption core that can ooze under quick conduction, baby diaper not only can increase the diffusion length of liquid, improves core utilization ratio, simultaneously, increases the liquid speed down, promotes the product dryness nature moreover, promotes baby diaper's quality, simultaneously, forms the concave shape of fit in crotch position after compound absorption core saturation absorption liquid, like "V" or "U" shape, struts user's shank when avoiding baby diaper to use, wears comfortablely.

While the foregoing description illustrates and describes the preferred embodiments of the present invention, as noted above, it is to be understood that the invention is not limited to the forms disclosed herein but is not to be construed as limited to other embodiments, and is capable of use in various other combinations, modifications and environments and is capable of changes or modifications within the spirit of the invention described herein, either as a result of the foregoing teachings or as a result of the knowledge or skill of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.

Claims

1. The preparation method of the composite absorption core body capable of conducting rapid infiltration comprises the steps of sequentially laminating and connecting the layers from top to bottom, wherein the composite absorption core body comprises a first swelling paper layer, a first high water absorption resin layer, a fluffy non-woven layer, a second high water absorption resin layer and a second swelling paper layer, and the fluffy non-woven layer is prepared through the following process steps:

slitting the fluffy non-woven fabric layer into more than 3 fluffy non-woven fabric strips which are arranged along the width direction, wherein two ends of each fluffy non-woven fabric strip extend along the length direction;

taking a fluffy non-woven fabric strip positioned in a longitudinal central line area as a reference fluffy non-woven fabric strip, respectively applying reference stretching force to two longitudinal ends of the reference fluffy non-woven fabric strip, respectively applying stretching force to two longitudinal ends of each fluffy non-woven fabric strip positioned at two sides of the reference fluffy non-woven fabric strip in the width direction, wherein the stretching force is sequentially increased or decreased along the side boundary direction of the fluffy non-woven fabric layer by taking the reference stretching force as a reference to form a stepped stretching force relation, so that each fluffy non-woven fabric strip is deformed and narrowed to different degrees in the width direction, the width ratio is 60% -80%, the transverse width of the fluffy non-woven fabric layer is synchronously narrowed, and flow guiding penetration through holes are formed between the stretched fluffy non-woven fabric strips;

the diversion penetration through hole presents a gap-shaped long thin seam or a long cutting groove, directly conducts the first puffing paper layer and the second puffing paper layer,

after the composite absorbent core body is saturated and absorbs liquid, the composite absorbent core body can be folded at the crotch part to form a concave shape suitable for the body;

wherein the stretching force is achieved by: the stretching force is set differently by adjusting different linear speeds of the fluffy nonwoven strips, including adjusting different linear speeds for a reference fluffy nonwoven strip and the fluffy nonwoven strips positioned on both sides of the reference fluffy nonwoven strip, as follows:

step a, setting a reference linear velocity for the reference fluffy non-woven fabric strip;

b, taking a reference linear velocity as a reference, and sequentially increasing or decreasing the linear velocity of each fluffy non-woven fabric strip positioned on two sides of the reference fluffy non-woven fabric strip in the width direction along the side boundary direction of the fluffy non-woven fabric layer, so that a step-shaped linear velocity relation is formed from the reference fluffy non-woven fabric strip to the measured boundary of the fluffy non-woven fabric layer;

2. The method of manufacturing according to claim 1, characterized in that: the concave shape is a V-shaped or U-shaped shape.

3. The method of manufacturing according to claim 1, characterized in that: the breadth ratio of the fluffy non-woven fabric strip is 70% -80%.