CN112972118A

CN112972118A - Preparation method of composite absorption core body capable of conducting infiltration rapidly

Info

Publication number: CN112972118A
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: 2021-06-18
Anticipated expiration: 2040-12-14
Also published as: CN112972118B

Abstract

The invention relates to a preparation method of a composite absorption core body capable of rapidly conducting downward seepage, the composite absorption core body 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, and the first swelling paper layer, the first super absorbent resin layer, the second super absorbent resin layer and the second swelling paper layer are sequentially overlapped and connected to form the composite absorption core body, wherein the fluffy 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 arranged on a machine; step 2, adjusting the stretching force after cutting to stretch and narrow each fluffy non-woven fabric strip, wherein the width ratio is 60-80%, the transverse width of the fluffy non-woven fabric layer is synchronously narrowed, and a flow guide permeation through hole is formed between the stretched fluffy non-woven fabric strips; the flow guide permeation through hole is directly communicated with the first expanded paper layer and the second expanded paper layer, so that the liquid diffusion length, the core body utilization rate and the dryness are increased, and a proper concave shape is formed at 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 downward seepage quickly and a preparation method thereof.

Background

The invention relates to a production process for leading a core body to have a diversion effect by modifying a production process of a composite core body, wherein an absorption core body of a sanitary article in domestic market at the current stage mainly comprises a five-layer composite core body, a wood pulp polymer core body (a traditional core body) has larger problems in the aspects of core body strength and dryness, but the composite core body is limited by polymer distribution and material conduction performance, the absorption core body cannot be fully utilized only by the material and the liquid permeability of the polymer, and the composite core body at the current stage has larger defects under the condition of low utilization rate of the absorption core body.

Disclosure of Invention

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

in order to achieve the effects of rapid penetration and rapid conduction, the invention provides a composite absorption core body for rapid conduction and downward penetration, 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 first swelling paper layer, the first super absorbent resin layer, the fluffy non-woven fabric layer, the second super absorbent resin layer and the second swelling paper layer are sequentially overlapped and connected to form the composite absorption core body. Wherein the fluffy non-woven fabric layer is prepared by the following process steps:

step 1, processing the fluffy non-woven fabric layer on a machine and then slitting into fluffy non-woven fabric strips:

and (3) cutting the fluffy non-woven fabric layer (the third layer) along the width (transverse) direction of the fluffy non-woven fabric layer, so that the fluffy non-woven fabric layer is cut into a plurality of fluffy non-woven fabric strips arranged along the width (transverse) direction, and two ends of each fluffy non-woven fabric strip extend along the length (longitudinal) direction of the fluffy non-woven fabric strip.

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

and applying certain stretching force to the longitudinal two ends of each fluffy non-woven fabric strip to ensure that the fluffy non-woven fabric strips generate stretching deformation under the action of the stretching force, naturally forming flow guide permeation through holes between the stretched fluffy non-woven fabric strips, and synchronously narrowing the transverse width of the fluffy non-woven fabric layer.

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

specifically, when the number of the bulky nonwoven strips is 2, the same stretching force is applied to both longitudinal ends of each bulky nonwoven strip, so that each bulky nonwoven strip is deformed and narrowed in the width direction (i.e., is inwardly contracted in the center direction of the bulky nonwoven strips), thereby forming a flow guide permeation through hole for rapidly conducting downward permeation between the bulky nonwoven strips.

Specifically, when the number of the bulky nonwoven strips is 3, the bulky nonwoven strip located in the longitudinal centerline region is taken as a reference bulky nonwoven strip, and reference stretching forces are respectively applied to both longitudinal ends of the reference bulky nonwoven strip, and the stretching forces of the bulky nonwoven strips located on both sides of the bulky nonwoven layer are increased or decreased relative to the reference stretching forces, so that each bulky nonwoven strip is deformed and narrowed in the width direction (i.e., inwardly contracted toward the center direction of the bulky nonwoven strip), thereby forming a flow guide permeation through hole for rapidly conducting downward permeation between every two adjacent bulky nonwoven strips.

Specifically, when the number of the bulky nonwoven fabric strips is 5 or more, the bulky nonwoven fabric strip located in the longitudinal centerline region is referred to as the bulky nonwoven fabric strip, and applying a reference stretching force to both longitudinal ends of the reference bulky nonwoven fabric strip, respectively, and at the same time, applying a stretching force to both longitudinal ends of each of the bulky nonwoven strips positioned on both sides of the reference bulky nonwoven strip in the width direction, but the stretching force is based on the reference stretching force and is sequentially increased or decreased along the side boundary direction of the fluffy non-woven fabric layer, each fluffy non-woven fabric strip is deformed and narrowed to different degrees in the width direction (namely, the fluffy non-woven fabric strip is contracted inwards towards the center direction) through the step-shaped stretching force relation, thereby forming a flow guide permeation through hole for rapidly guiding infiltration between every two adjacent fluffy non-woven fabric strips.

The fluffy non-woven fabric layer is cut, and the process steps of increasing and decreasing the stretching force to form the step-shaped stretching force relationship are adopted, so that the fluffy non-woven fabric strips generate larger deformation, the fluffy non-woven fabric layer is narrowed synchronously, and a natural separation groove, namely a flow guide permeation 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 strips to set different said stretching forces, such as: adjusting different linear speeds of the reference fluffy non-woven fabric strip and the fluffy non-woven fabric strips positioned at two sides of the reference fluffy non-woven fabric strip as follows:

step a, setting a reference linear speed 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 the 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, performing differential stretching narrowing, so that a stepped linear velocity relation is formed from the reference fluffy non-woven fabric strip to the side boundary of the fluffy non-woven fabric layer.

And c, enabling each fluffy non-woven fabric strip to deform and narrow in the width direction by the linear velocity, and forming the flow guide permeation through hole between two adjacent fluffy non-woven fabric strips through a stepped linear velocity relationship.

Specifically, the reference line speed and the line speed are both expressed as a percentage of the width of the bulky nonwoven fabric strip after the stretch narrowing with respect to the initial width of the bulky nonwoven fabric strip (unstretched narrowed width), and the width ratio thereof is 60% to 80%, and further preferably 70% to 80%.

The flow guide permeation through holes enable the flow guide effect of the composite absorption core body to be greatly improved. The flow guide permeation through holes greatly improve the diffusion of the core body, so that the absorption speed, the plane absorption performance and the U-shaped pressurization absorption performance of the core body are obviously improved.

Under the effect of water conservancy diversion infiltration through-hole, avoided fluffy non-woven fabrics layer to liquid diffusion, the barrier action of infiltration in-process on the composite absorption core, water conservancy diversion infiltration through-hole is a great space for the first popped ply (first structural layer) and the popped ply (fifth structural layer) of second of composite absorption core directly switch on, surface liquid can infiltrate the popped ply of second through the clearance fast down like this, makes liquid can permeate fast.

Meanwhile, under the action of the diversion permeation through holes, liquid can be quickly conducted to two sides along the clearance diversion permeation through holes, 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 holes are gaps-shaped long thin seams or long cutting grooves, the foldability is better, after the composite absorption core body is saturated to absorb liquid, two longitudinal side edges of the composite absorption core body can be respectively folded along the diversion permeation through holes to the longitudinal center direction, so that the composite absorption core body forms a proper concave shape such as a V shape or a U shape at the crotch position, the legs of a user are prevented from being propped open, and the legs of the user are also prevented from being rubbed. The method specifically comprises the following steps:

(1) when the fluffy non-woven fabric layer has only one gap, namely when the fluffy non-woven fabric layer is cut into two parts, the crotch part forms a V shape after liquid absorption;

(2) or when the fluffy non-woven fabric layer has only two gaps, the crotch part forms a U shape after liquid absorption.

The concave shape of the body fitting avoids the situation that when saturated absorption occurs, the composite absorption core body presents a full cuboid, the crotch of a baby is forcedly propped open, and the long-time crotch is propped open, so that O-shaped legs are easily caused for the baby.

The invention has the following beneficial effects:

firstly, the fluffy non-woven fabric layer is cut, and the process steps of forming the step-shaped tension force relationship by increasing and decreasing the tension force are adopted, so that the fluffy non-woven fabric strips generate larger deformation, the fluffy non-woven fabric layer is narrowed synchronously, and a dividing groove, namely a flow guide permeation through hole, is formed in the core body.

Secondly, the water conservancy diversion infiltration through-hole makes the water conservancy diversion effect of composite absorption core obtain very big promotion. Under the effect of water conservancy diversion infiltration through-hole, avoided fluffy non-woven fabrics layer to liquid diffusion, the separation effect of infiltration in-process on the composite absorption core, water conservancy diversion infiltration through-hole is a great space for the first popped ply (first structural layer) and the popped ply (fifth structural layer) of second of composite absorption core directly switch on, surface liquid can permeate down the popped ply of second through the clearance fast like this, makes liquid can permeate fast.

And under the action of the diversion permeation through holes, liquid can be quickly conducted to two sides along the clearance diversion permeation through holes, 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, water conservancy diversion infiltration through-hole is the clearance form, and the foldability is better, and when the compound absorption core absorbed more urine, the spill shape that fits one's body can appear in crotch position, specifically does: when fluffy non-woven fabrics layer only had a clearance, carry out one promptly to fluffy non-woven fabrics layer and be two when cutting, crotch position forms the V type behind the imbibition, perhaps fluffy non-woven fabrics layer is when only two clearances, and crotch position forms the U-shaped behind the imbibition, when having avoided appearing the saturation absorption, the compound absorption core demonstrates a fuller cuboid, struts baby's crotch portion by force, and long-time crotch portion struts, leads to the fact O shape leg for baby easily.

Drawings

Figure 1 is a schematic structural view of a composite absorbent core that is rapidly conductive of downward osmosis.

Fig. 2 is a schematic view of slitting a lofty nonwoven layer.

Fig. 3 is a schematic view of the slit differential stretch narrowing of a lofty nonwoven layer.

Fig. 4 is a schematic structural view of a flow-guiding infiltration opening of example 1.

Fig. 5 is a schematic structural view of a flow-guiding infiltration opening of example 2.

Fig. 6 is a schematic structural view of a flow-guiding infiltration penetration of example 3.

Figure 7 is a schematic cross-sectional view of a composite absorbent core that is rapidly conductive of downward osmosis.

Fig. 8 is a schematic structural view of a baby diaper capable of conducting and absorbing rapidly.

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

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and more obvious, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring also to fig. 1-9, the rapid conductive acquisition composite core of the present invention has the following structure: composite absorption core 1 is from last to including first popped ply 11, first super absorbent resin layer 12, fluffy non-woven fabrics layer 13, second super absorbent resin layer 14 and the popped ply 15 of second down, and it forms to superpose each layer in proper order to connect, and its structural feature is in:

first, the bulky nonwoven layer 13 is composed of more than 2 bulky nonwoven strips, for example, the number of bulky nonwoven strips may be 2, 3, 4, 5 or 6, preferably 2, 3 or 5.

Secondly, a flow guiding and penetrating through hole with gap-shaped long fine slits or long cutting grooves 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 and absorbs liquid, the two longitudinal sides of the composite absorption core body can be respectively turned over towards the longitudinal center direction along the diversion permeation through holes, so that the composite absorption core body forms a proper concave shape at the crotch part, such as a V shape or a U shape, the legs of a user are prevented from being unfolded, and the legs of the user are prevented from being rubbed.

The method specifically comprises the following steps:

The absorption core body capable of rapidly conducting infiltration is prepared by the following process steps:

step 1, processing the fluffy non-woven fabric layer 13 on a machine and then slitting into fluffy non-woven fabric strips:

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

The stretching force of two adjacent bulky nonwoven strips may be the same in particular embodiments, such as: 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 is deformed and narrowed in the width direction (i.e. the fluffy non-woven fabric strips are inwards shrunk in the central direction), and a flow guide permeation through hole for rapidly conducting infiltration is formed among the fluffy non-woven fabric strips.

In other embodiments, however, the tensile forces of two adjacent lofty nonwoven strips are different, again as follows:

when the number of the bulky nonwoven fabric strips is 3, the bulky nonwoven fabric strip located in the longitudinal center line region is used as a reference bulky nonwoven fabric strip 13b, and reference stretching forces are applied to both longitudinal ends of the reference bulky nonwoven fabric strip, and for the bulky nonwoven fabric strips 13a and 13c located at both sides of the reference bulky nonwoven layer, the stretching force is increased or decreased relative to the reference stretching force, so that each fluffy non-woven fabric strip is deformed and narrowed in the width direction (i.e. is contracted inwards towards the center direction of the fluffy non-woven fabric strip), thereby forming a flow guiding and permeating through hole 101 for rapidly conducting infiltration between the fluffy non-woven fabric strip 13a and the reference fluffy non-woven fabric strip 13b, and forming a rapid conductive infiltration penetration opening 102 between the bulky nonwoven strip 13c and the reference bulky nonwoven strip 13 b.

In addition, the bulky nonwoven fabric layer 13 may be cut into 5 or more bulky nonwoven fabric strips. When the fluffy non-woven fabric strips are cut into 5 fluffy non-woven fabric strips, the fluffy non-woven fabric strips positioned in a longitudinal central line area are used as reference fluffy non-woven fabric strips, reference drawing forces are respectively applied to two longitudinal ends of the reference fluffy non-woven fabric strips, meanwhile, drawing forces are respectively applied to two longitudinal ends of each fluffy non-woven fabric strip positioned at two sides of the reference fluffy non-woven fabric strips in the width direction, but the drawing forces are based on the reference drawing forces and are sequentially increased or decreased progressively along the side boundary direction of the fluffy non-woven fabric layers, and each fluffy non-woven fabric strip is deformed and narrowed in different degrees in the width direction (namely inwardly contracted towards the central direction of the fluffy non-woven fabric strips) through a step-shaped drawing force relationship, so that a flow guiding and permeation through hole capable of rapidly conducting downward permeation is formed between every two adjacent fluffy non-woven fabric strips.

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

Taking a fluffy non-woven fabric with a square gram weight of 42g as an example, under the action of the pulling force of a machine, the retraction rate of the fluffy non-woven fabric after being loaded on the machine is about 10%, namely a machine with a width of one meter needs to be provided with the fluffy non-woven fabric with a width of 1.12m, the fluffy non-woven fabric is only about 1.03m after being retracted, after being cut, in order to ensure that the width of a double-length cutting groove reaches about 10mm, the width of a single-length cutting groove reaches about 15mm, the longitudinal pulling force of the raw material needs to be adjusted to be 25-30N/m (namely the pulling force of the fluffy non-woven fabric with the width of one meter is 25N), the width of the fluffy: the middle of the core body with the thickness of 105mm is cut twice, and the fluffy non-woven fabric is stretched by a machine to form the following structure: fluffy non-woven strips of 30 mm-10mm gap-25 mm fluffy non-woven strips-10 mm gap-30 mm fluffy non-woven strips. Thus, to narrow the width of the lofty nonwoven web by a higher percentage or magnitude, the longitudinal stretch force is adjusted.

In particular embodiments, for ease of production control and operation, the stretching force is achieved by: i.e. by adjusting different line speeds of the bulky nonwoven strip to set different said stretching forces, such as: adjusting different linear speeds of a reference fluffy non-woven fabric strip and fluffy non-woven fabric strips positioned at two sides of the reference fluffy non-woven fabric strip as follows:

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

The following examples are provided to describe the embodiments of the lofty nonwoven fabric layer and the flow-guiding penetration holes of the slit-like long slits or long grooves thereof.

Example 1

This example cut the lofty nonwoven layer 13 into 3 lofty nonwoven strips. The fluffy non-woven fabric strip positioned in the longitudinal center line area is taken as a reference fluffy non-woven fabric strip 13b, reference stretching force is respectively applied to two longitudinal ends of the reference fluffy non-woven fabric strip, and the stretching force is realized by adjusting the linear velocity to enable the fluffy non-woven fabric strip to generate the percentage of deformation and narrowing in the width direction. The method comprises the following specific steps:

step 1, setting the reference linear velocity of the reference bulky nonwoven fabric strip 13b, and setting the width ratio of the reference bulky nonwoven fabric strip to 80%.

And 2, arranging the fluffy

non-woven fabric strips

13a and 13c which are positioned at the two sides of the reference fluffy non-woven fabric strip, and adjusting the linear speed, wherein the width ratio of the fluffy non-woven fabric strips is 80 percent.

Through the differential stretching narrowing, the fluffy non-woven fabric strips 13a generate larger deformation according to the fluffy non-woven fabric strips 13b and 13c, the fluffy non-woven fabric strips 13a, the fluffy non-woven fabric strips 13b and the fluffy non-woven fabric strips 13c generate deformation and narrowing in 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 a long cutting groove is formed in the core body, namely the flow guide permeation through

holes

101 and 102 are formed between two adjacent fluffy non-woven fabric strips.

The flow guiding

penetration holes

101 and 102 greatly improve the flow guiding effect of the composite absorption core body 1. The flow-guiding permeation through

holes

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

Example 2

In this embodiment, the fluffy nonwoven fabric strip 13a and the reference fluffy nonwoven fabric strip 13b, and the reference fluffy nonwoven fabric strip 13b and the reference fluffy nonwoven fabric strip 13c are deformed and narrowed at different ratios in the width direction, and a step-like linear velocity relationship is formed between the reference fluffy nonwoven fabric strip and the boundary of the fluffy nonwoven fabric layer. Therefore, the present embodiment is different from embodiment 1 only in that the present embodiment is different in setting the reference linear velocity of the reference bulky nonwoven strip 13b and the width ratio (linear velocity) of the bulky

nonwoven strips

13a, 13c located on both sides of the reference bulky nonwoven strip.

And 2, setting linear speeds of the fluffy

non-woven fabric strips

13a and 13c, wherein the width ratios of the fluffy non-woven fabric strips are both 60%.

The flow guide penetration through

holes

103 and 104 greatly improve the flow guide effect of the composite absorption core body. The diffusion of the composite absorption core body is greatly improved by the diversion and permeation through

holes

103 and 104, the composite absorption core body capable of rapidly conducting downward permeation is obtained, the absorption speed, the plane absorption performance and the U-shaped pressurization absorption performance of the composite absorption core body are obviously improved, and the absorption performance of the composite absorption core body is respectively shown in tables 1, 2 and 3.

Example 3

This example differs from example 1 only in that the present example differs in the reference linear speed of the reference bulky nonwoven strip, the width ratio (linear speed) settings of the bulky nonwoven strips on both sides of the reference bulky nonwoven strip.

And 2, setting linear speeds of the fluffy

non-woven fabric strips

13a and 13c, wherein the width ratios of the fluffy non-woven fabric strips are both 70%.

The flow guiding effect of the composite absorption core body is greatly improved by the flow guiding penetration through

holes

105 and 106. The diffusion of the composite absorption core body is greatly improved by the diversion and permeation through

holes

105 and 106, the composite absorption core body capable of rapidly conducting downward permeation is obtained, the absorption speed, the plane absorption performance and the U-shaped compression absorption performance of the composite absorption core body are obviously improved, and the absorption performance of the composite absorption core body is respectively shown in tables 1, 2 and 3.

Example 4

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

The composite absorption core 1 of this embodiment baby diaper includes from last to bottom first popped ply, first super absorbent resin layer, fluffy non-woven fabrics layer, second super absorbent resin layer and the popped ply of second, and it forms to superpose each layer in proper order to connect, and its structural feature lies in: the fluffy non-woven fabric layer 13 is provided with guide permeation through

holes

101 and 102 capable of rapidly conducting infiltration, the guide permeation through

holes

101 and 102 present gap-shaped long slits or long cutting grooves, the first bulked paper layer and the second bulked paper layer are directly communicated, and the composite absorption core body 1 can be folded at the crotch position to form a proper concave shape after being saturated and absorbing liquid.

The flow-guiding

penetration holes

101 and 102 of the present embodiment are realized by the following steps:

1) the bulky nonwoven layer 13 is slit in its width direction, so that the bulky nonwoven layer is slit into 3 bulky nonwoven strips arranged in the width direction, both ends of each of the bulky nonwoven strips extending in its length direction.

2) Applying certain stretching force to the longitudinal two ends of each fluffy non-woven fabric strip to enable the fluffy non-woven fabric strips to generate stretching deformation under the action of the stretching force, wherein 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 permeation through

holes

101 and 102 are formed between the stretched fluffy non-woven fabric strips.

The fluid-guiding permeation through

holes

101 and 102 of the present embodiment can significantly improve the absorption speed, the plane absorption performance and the U-shaped compression absorption performance of the baby diaper, and the absorption performance is shown in tables 4 and 5, respectively.

Example 5

This example provides a baby diaper (disposable absorbent article) using the composite absorbent core capable of rapidly transmitting downward osmosis prepared in example 2, and differs from example 4 only in that the bulky nonwoven fabric strip 13b located in the longitudinal center region has a width ratio of 80%, while the bulky

nonwoven fabric strips

13a, 13c located on both sides have a linear velocity of 60% both in the width ratio, and the flow guide and permeation through

holes

103, 104 are formed.

The fluid-guiding permeation through

holes

104 and 105 of the present embodiment can significantly improve the absorption speed, the plane absorption performance and the U-shaped compression absorption performance of the baby diaper, and the absorption performance is shown in tables 4 and 5, respectively.

Example 6

This example provides a baby diaper (disposable absorbent article) using the composite absorbent core capable of rapidly transmitting downward osmosis prepared in example 3, and differs from example 4 only in that the bulky nonwoven fabric strip 13b located in the longitudinal center region has a width ratio of 80%, while the bulky

nonwoven fabric strips

13a, 13c located on both sides have a linear velocity of 70% both in the width ratio, and the fluid-transmitting through

holes

105, 106 are formed.

The absorption properties of this example are shown in tables 4 and 5.

And (3) performance testing:

1. sample preparation:

(1) composite absorbent core that can conduct infiltration down fast: the superabsorbent resins (SAP), the lofty nonwoven layer, and the cover layer (bulked paper) used in the test and comparative samples were all commercially available and differed only by: the fluffy non-woven fabric layer in the test sample is the fluffy non-woven fabric formed by slitting differential stretching and narrowing, while the fluffy non-woven fabric layer in the comparison sample is the fluffy non-woven fabric applied in the prior art, namely the fluffy non-woven fabric is not slit differential stretching and narrowing.

(2) Baby diapers (disposable absorbent articles): baby diapers (model L) using the composite absorbent cores of examples 1, 2 and 3, respectively, which rapidly conduct the downward permeation, were used, and the comparative sample was a commercial ordinary baby diaper (model L).

2. The test method comprises the following steps:

(1) and (3) national standard test: the test was carried out with reference to GB/T28004-2011 diapers (sheets, pads).

(2) And (3) plane testing:

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

And 2, wetting the national standard washing funnel twice by using a test solution, fixing the funnel on a support, adjusting the lower opening of the funnel to face an operator, and enabling the central point of the lower opening to be vertically 5-10 mm away from the surface of the sample.

And 3, placing filter paper with known mass M1 on the sticky board, unfolding and flatly sticking the diaper sample on the sticky board (pressing the filter paper), removing the leakage-proof separation edge by using scissors, and flattening the diaper surface layer without folds.

And 4, taking 100ml of 0.9% physiological saline test solution added with the pigment by using the measuring cylinder, adjusting the flow rate of the special standard funnel, pouring the test solution into the funnel, and starting timing at the same time, wherein the time for completing the whole absorption of the liquid is the first absorption speed T1.

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

And 6, at the 10 th minute, taking M2 filter paper with known mass, placing the filter paper in the middle of the diaper, pressing the upper surface of the filter paper by using a 3.5kg press block, taking out the press block after 1 minute, taking out the upper layer and the lower layer of the filter paper with known mass, weighing, recording data, wherein the lower layer is M3, the upper layer is M4, and the diffusion length of the test product is L (the length is an average value).

And 7, recording and calculating secondary plane liquid feeding test data of the product, wherein the product quality is 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) And (3) U-shaped test:

step 1, selecting 3 pieces of products with gram weights above and below a theoretical mean value, weighing the products with the mass of M, marking a liquid adding point in the center of the products, and weighing a proper amount of filter paper as M1.

And 2, sticking the product on a U-shaped groove, fixing the funnel on a support, and enabling the vertical distance between the central point of the lower opening and the surface of the sample to be 5-10 mm.

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

Step 4, pouring the test solution into an adjusted special standard funnel, and starting timing; the penetration (blotting) time is the first absorption rate T1 of the product.

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

And 6, taking down the tested diaper at 9min and 30s to present a natural bending condition, and placing the M1 filter paper with known mass in the middle of the diaper at the 10 th minute, and pressing the upper surface of the filter paper by using a 1.2kg pressing block.

Step 7, collecting the pressing block after 11 minutes, weighing the filter paper and recording data as M2; lay flat and measure the product diffusion length as L (length as mean).

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

The test results are shown in the following table.

TABLE 1 national Standard test for absorption and diffusion Properties

TABLE 2 planar absorption and diffusion Properties of composite absorbent core

TABLE 3U-shaped absorption and diffusion performance of composite absorption core

TABLE 4 planar absorption and diffusion Properties of absorbent articles

Test items	Example 4	Example 5	Example 6	Comparative sample
					Speed of absorption(s) for the 1 st time	12	13	12	14
Speed of absorption(s) 2 nd time	32	28	30	46
					Return volume (g)	5.26	4.56	5.39	9.78
Frontal 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 items	Example 4	Example 5	Example 6	Comparative sample
					Speed of absorption(s) for the 1 st time	32	30	28	42
Speed of absorption(s) 2 nd time	31	32	33	51
					Return volume (g)	5.93	5.08	5.35	8.82
Frontal diffusion length (mm)	181	189	183	167
					Back diffusion length (mm)	221	243	235	212

Test results show that the composite absorption core capable of rapidly conducting infiltration provided by the invention is a diversion infiltration through hole formed by slitting and differential stretching narrowing of a fluffy non-woven fabric layer no matter in national standard test, plane absorption test or U-shaped absorption test, but the diffusion length of liquid can be increased, the utilization rate of the core is improved, meanwhile, the infiltration speed is increased, the dryness and the smoothness of a product are improved, and the comprehensive performance of the product is improved.

The reason for this is that, under the effect of water conservancy diversion infiltration through-hole, avoided fluffy non-woven fabrics layer to liquid diffusion, the barrier effect of infiltration in-process on the composite absorption core, water conservancy diversion infiltration through-hole is a great space for the first popped paper layer (first structural layer) and the popped paper layer of second (fifth structural layer) of composite absorption core directly switch on, surface liquid can infiltrate the popped paper layer of second through the clearance fast down like this, makes liquid can permeate fast.

Because the composite absorption core that can conduct infiltration down fast of this application has above-mentioned absorption performance, consequently, when being applied to baby diaper with this composite absorption core that can conduct infiltration down fast, baby diaper not only can increase the diffusion length of liquid, improves the core utilization ratio, simultaneously, increase the speed of draining, and promote the dry and comfortable nature of product, promote baby diaper's quality, simultaneously, form the concave shape of fit after the composite absorption core saturation absorption liquid in crotch portion position, like "V" or "U" type shape, prop open user's shank when avoiding baby diaper to use, it is comfortable to dress.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and may be modified within the scope of the inventive concept described herein by the teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be protected by the following claims.

Claims

1. The utility model provides a preparation method of compound absorption core that rapid conduction was infiltrated, compound absorption core includes first popped paper layer, first super absorbent resin layer, fluffy non-woven fabrics layer, second super absorbent resin layer and the popped paper layer of second from last to down, overlaps each layer in proper order and connects to form, wherein, fluffy non-woven fabrics layer is prepared through following process steps:

cutting the fluffy non-woven fabric layer along the width direction of the fluffy non-woven fabric layer, thereby cutting the fluffy non-woven fabric layer into a plurality of fluffy non-woven fabric strips arranged along the width direction, wherein two ends of each fluffy non-woven fabric strip extend along the length direction;

applying certain stretching force to the longitudinal two ends of each fluffy non-woven fabric strip to enable the fluffy non-woven fabric strips to generate stretching deformation under the action of the stretching force, wherein the width ratio of the fluffy non-woven fabric strips is 60-80%, the transverse width of the fluffy non-woven fabric layer is synchronously narrowed, and a flow guide permeation through hole is formed between the stretched fluffy non-woven fabric strips;

the diversion penetration through hole presents a gap-shaped long slit or a long cutting groove, the first expanded paper layer and the second expanded paper layer are directly conducted, and the composite absorption core body can be folded at the crotch position to form a proper concave shape after being saturated and absorbing liquid.

2. The method of claim 1, wherein: the concave shape is a V shape or a U shape.

3. The method of claim 1, wherein: the width ratio of the fluffy non-woven fabric strip is 70-80%.

4. The method of claim 1, wherein: and (3) cutting the fluffy non-woven fabric layer into 2 fluffy non-woven fabric strips, wherein the stretching force of each fluffy non-woven fabric strip is the same.

5. The method of claim 4, wherein: and applying the same stretching force to the two longitudinal ends of each fluffy non-woven fabric strip respectively to enable each fluffy non-woven fabric strip to deform and narrow in the width direction, so that the flow guide permeation through holes are formed among the fluffy non-woven fabric strips.

6. The method of claim 1, wherein: and cutting the fluffy non-woven fabric layer into more than 3 fluffy non-woven fabric strips, wherein the stretching force of two adjacent fluffy non-woven fabric strips is different.

7. The method of claim 6, wherein: the fluffy non-woven fabric layer is cut into 3 fluffy non-woven fabric strips, the fluffy non-woven fabric strips positioned in the longitudinal central line area are used as reference fluffy non-woven fabric strips, reference stretching forces are respectively applied to two longitudinal ends of the reference fluffy non-woven fabric strips, the stretching forces of the fluffy non-woven fabric strips positioned on two sides of the fluffy non-woven fabric layer are increased or reduced relative to the reference stretching forces, so that each fluffy non-woven fabric strip generates deformation and narrowing with different amplitudes in the width direction, and the flow guide permeation through holes are formed between every two adjacent fluffy non-woven fabric strips.

8. The method of claim 6, wherein: the method comprises the steps of cutting a fluffy non-woven fabric layer into fluffy non-woven fabric strips with the number of more than 5, regarding the fluffy non-woven fabric strips positioned in a longitudinal central line area as reference fluffy non-woven fabric strips, respectively applying reference stretching forces to two longitudinal ends of the reference fluffy non-woven fabric strips, and simultaneously respectively applying stretching forces to two longitudinal ends of each fluffy non-woven fabric strip positioned at two sides of the reference fluffy non-woven fabric strips in the width direction, wherein the stretching forces are sequentially increased or decreased progressively along the side boundary direction of the fluffy non-woven fabric layer by taking the reference stretching forces as a reference to form a step-shaped stretching force relationship, so that each fluffy non-woven fabric strip is deformed and narrowed in the width direction to different degrees, and the flow guide permeation through holes are formed between every two adjacent fluffy non-woven fabric strips.

9. The production method according to claim 7 or 8, characterized in that: the stretching force is realized by the following modes: the different said stretching forces are set by adjusting the different line speeds of the bulky nonwoven strips.

10. The method of claim 9, wherein: adjusting different linear speeds of a reference fluffy non-woven fabric strip and fluffy non-woven fabric strips positioned at two sides of the reference fluffy non-woven fabric strip, and the steps are as follows:

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

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 at 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 as to form a stepped linear velocity relationship from the reference fluffy non-woven fabric strip to the side boundary of the fluffy non-woven fabric layer;

and c, enabling each fluffy non-woven fabric strip to deform and narrow in the width direction by the linear velocity, and forming the flow guide permeation through hole between two adjacent fluffy non-woven fabric strips through the stepped linear velocity relationship.