CN113730108A

CN113730108A - Paper diaper core and preparation method thereof

Info

Publication number: CN113730108A
Application number: CN202010459499.8A
Authority: CN
Inventors: 王胜地
Original assignee: Beijing Purism Technology Co ltd
Current assignee: Beijing Purism Technology Co ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-12-03

Abstract

The invention relates to a paper diaper core body, which comprises an absorption core body with a multilayer structure, wherein an H-shaped diversion trench (12) is formed on the absorption core body (10), the absorption core body (10) is of a 5-layer structure, and the absorption core body sequentially comprises the following components: the absorbing core body is characterized by comprising a first coating layer, a first high polymer layer, a fluffy cotton layer, a second high polymer layer and a second coating layer, wherein the H-shaped diversion trench (12) penetrates through the 5-layer structure of the absorbing core body (10). The weight ratio of the first polymer layer to the second polymer layer is 2: 3. The paper diaper core body has high polymer utilization rate and low cost, is provided with the special diversion trench, can improve diversion efficiency, increases the polymer utilization rate, and overcomes the defects of the prior art.

Description

Paper diaper core and preparation method thereof

Technical Field

The invention relates to a paper diaper core and a preparation method thereof, and belongs to the field of infant sanitary products.

Background

The paper diaper is a disposable sanitary article formed by combining non-woven fabrics and an absorption core body and is mainly used for absorbing excrement such as urine. The urine absorbing part of the paper diaper is an absorbing core body, and the absorbing core body is one of important components for manufacturing disposable sanitary products such as the paper diaper, a sanitary towel, a protection pad and the like. The paper diaper cores in different regions of the world are designed differently and mainly comprise fluff pulp cores and composite cores.

In the prior art, a diaper comprises a pant body and an absorbing part, wherein the absorbing part comprises an upper surface layer, a lower surface layer and an absorbing core body arranged between the upper surface layer and the lower surface layer, and the absorbing core body is usually arranged between the upper surface layer and the lower surface layer after a multi-layer core body is cut into a certain shape.

Fluff pulp cores are composed of superabsorbent polymer (SAP) particles dispersed in fluff pulp fibers, and are commonly used in european and american countries, where the presence of fluff pulp provides a temporary liquid storage space for diapers, which facilitates rapid liquid absorption. However, the core is very easy to agglomerate, break or roll up during the use process.

The composite core body is also called a full core body, is a core body structure commonly applied to domestic paper diapers at present, and mainly comprises non-woven fabrics, super absorbent resin and fluffy cotton. Super Absorbent Polymer (SAP) is a water absorbent material commonly used in the current paper diaper, which can rapidly absorb and retain a large amount of liquid even under a certain pressure. When the SAP encounters water, it expands in volume to form a gel-like mass. The formation of gel hinders the diffusion of liquid in all directions, affecting the liquid infiltration, a phenomenon known as gel blocking. Once the SAP in the diaper has a gel blocking phenomenon, the liquid in the diaper is not sufficiently diffused, the infiltration speed of urine is affected, the probability of leakage is high during night use, and skin erythema may be caused. Due to the gel blocking phenomenon of the high polymer, the utilization rate of the SAP in the paper diaper with the composite core body on the market is low, and the urine cannot be diffused to two ends, so that waste is caused.

In summary, the conventional diaper has the following problems: (1) the gel of the super absorbent resin is liable to cause clogging, so that the liquid diffusing ability is poor, thereby causing local wetness, resulting in a rash of the skin of the user. (2) The utilization rate of SAP in the both ends of composite core is low, and the result of use is poor, and the material is extravagant many. In view of these problems, it is desired to develop an absorbent core with high diffusion capacity, and to improve the diffusion capacity, the infiltration rate and the utilization rate of SAP of the diaper as a whole.

Disclosure of Invention

The invention aims to solve the technical problem of providing a paper diaper core body with high polymer utilization rate and low cost, which is provided with a special flow guide groove, can improve the flow guide efficiency, increase the polymer utilization rate, overcome the defects of the prior art and avoid the waste phenomenon of incomplete absorption of polymer materials, thereby reducing the possibility of leakage and reducing the occurrence probability of skin rash of a user.

In order to achieve the above object of the present invention, a diaper core is provided, which includes an absorbent core having a multi-layer structure, and H-shaped channels are formed in the absorbent core.

When urine contacts the paper diaper, the urine is rapidly diffused along the shape of the flow guide grooves, the absorption speed and the diffusion length are improved, the utilization rate of macromolecules in the paper diaper is greatly improved, and the production cost can be effectively reduced.

The diversion trench of the full-core-body-structure paper diaper can be adjusted according to the actual size of the paper diaper.

According to the paper diaper absorbing core body, the absorbing core body is of a 5-layer structure and sequentially comprises the following components: the H-shaped diversion trench penetrates through the 5-layer structure of the absorption core body.

Further, the guide grooves comprise two parallel vertical guide grooves along the length direction of the absorption core body and a vertical guide groove perpendicular to the length direction of the core body.

Two vertical diversion trenches of the H-shaped diversion trench are arranged along the length direction of the absorption core body, and the distance from two ends of the two vertical diversion trenches to the corresponding two ends of the diaper core body is 78-80 mm; the distance between the outer edges of the two vertical diversion trenches and the edge of the diaper core body in the width direction is 45-48mm, and the diversion trenches of the horizontal diversion trench and the two vertical diversion trenches are 5-8mm in width.

The weight ratio of the first polymer layer to the macromolecular water-absorbing resin particles of the second polymer layer is 1: 4, 2: 3 or 1: 1.

Further, the first polymer layer and the second polymer layer are high-molecular water-absorbent resin particles which are scattered on the surface of the bulky cotton and have different properties.

Further, the first polymer layer is made of high-molecular water-absorbing resin particles with high absorption speed, such as 60S produced by Nippon sumitomo, which is well known, and the absorption speed is high; the second polymer layer is made of water-absorbent polymer particles having a good effect of saturated absorption, such as 960N P, which is widely known from Sandai Japan.

Further, the first coating layer is hydrophilic non-woven fabric added with hydrophilic oil, and the second coating layer is spunlace water-repellent non-woven fabric.

The non-woven fabric breaks through the traditional spinning principle, has the characteristics of short process flow, high production speed, high yield, low cost, multiple raw material sources and the like, and also has the advantages of biochemical filtration, high strength, low fuzziness, high hygroscopicity, rapid moisture absorption and the like. The fiber or the non-woven fabric is a high molecular polymer, and the hydrophilic group of the fiber or the non-woven fabric is little or has no hydrophilic group, so that the hydrophilic performance required in the application of the non-woven fabric can not be achieved, and therefore, the hydrophilic oiling agent is added. The hydrophilic non-woven fabrics has the advantages that the non-woven fabrics have certain moisture absorption capacity, and in the application of the paper diaper, the hydrophilic effect of the hydrophilic non-woven fabrics can enable liquid to be quickly conducted to the absorption core body.

Further, the fluffy cotton is a nonwoven fabric of 35-45 gsm. The fluffy cotton is one kind of non-woven fabric, is made of natural cotton fiber, artificial fiber or synthetic fiber through the processes of loosening, carding, glue spraying, baking and curing, and has the properties of fluffy, high compression resilience, light weight, heat preservation and the like.

In order to achieve the above object of the present invention, the present invention further provides a method for manufacturing a diaper core, which comprises the following steps:

providing a second cladding layer; spraying glue on the upper surface of the second coating layer; providing fluffy cotton, and applying high-molecular water-absorbing particles on the first surface of the fluffy cotton; combining a first surface of fluffy cotton containing high-molecular water-absorbing particles with a second coating layer after glue spraying; reversely combining the fluffy cotton and a second coating layer, and applying high-molecular water-absorbing particles on the second surface of the fluffy cotton; providing a first coating layer; spraying glue on the first coating layer; combining the first coating layer after glue spraying with a second surface of fluffy cotton containing high-molecular water-absorbing particles to form a 5-layer structure; and (4) passing the 5-layer structure through a stamping die to form an H-shaped diversion trench on the 5-layer structure. After the step of forming the H-shaped guide grooves, the method further comprises the step of splitting the 5-layer structure containing the complete H-shaped guide grooves to form the single absorbent core body.

In the invention, the diversion trench penetrates through the whole core body, when urine contacts the core body of the paper diaper, the first layer of non-woven fabric can effectively permeate the urine along the diversion trench, so that the two layers of macromolecules can well absorb the urine of a baby, the diffusion length of the paper diaper is improved, the utilization rate of the macromolecules is greatly improved, and the production cost is reduced. Meanwhile, due to the excellent material selection of the non-woven fabric, the baby can be extremely dry and comfortable.

Drawings

FIG. 1 is a schematic view of a diaper core of the present invention;

FIG. 2 is a schematic view of a process for manufacturing a diaper core according to the present invention.

Detailed Description

In order to more clearly illustrate the features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings, and it is to be noted that the following is an exemplary embodiment of the present invention, which is a preferred embodiment of the present invention and is not to be considered as a specific limitation of the scope of the present invention.

Fig. 1 is a schematic view of a diaper core of the present invention. As shown in fig. 1, the diaper core provided by the invention comprises an absorbent core 10 with a multilayer structure, wherein H-shaped channels 12 are formed on the absorbent core.

According to the paper diaper absorbing core body, the absorbing core body is of a 5-layer structure and sequentially comprises the following components: the absorbent core comprises a first coating layer, a first polymer layer, a loose cotton layer, a second polymer layer and a second coating layer, wherein the H-shaped diversion trench penetrates through a 5-layer structure (not shown) of the absorbent core body. Wherein, the first coating layer is the side that contacts with user's skin, and the second coating layer is the side of keeping away from user's skin.

Further, the channels 12 include two parallel vertical channels 122 along the length of the absorbent core and a horizontal channel 121 perpendicular to the length of the core.

As shown in fig. 1, two vertical channels 122 of the H-shaped channel 12 are disposed along the length direction of the absorbent core 10, and the distances from the two ends of the two vertical channels 122 to the corresponding two

ends

11, 13 of the diaper core are both 78-80 mm; the distance between the outer edges of the two vertical guide grooves 122 and the edge 14 of the diaper core in the width direction is 45-48mm, and the width of the guide grooves of the horizontal guide groove 121 and the two vertical guide grooves 122 is 5-8 mm.

So set up the absorption core including H type guiding gutter 12 that forms, when using, after urine contact panty-shape diapers, the urine diffuses rapidly along the shape of guiding gutter, when promoting absorption rate and diffusion length, has greatly improved the utilization ratio of polymer in the panty-shape diapers, can effectively reduction in production cost.

The weight ratio of the first polymer layer to the macromolecular water-absorbing resin particles of the second polymer layer is 1: 4, 2: 3 or 1: 1. The optimal mass ratio is 2: 3, the diffusion speed is fastest under the ratio, and the utilization rate of the high-molecular water-absorbing particles is highest.

Further, the first polymer layer and the second polymer layer are high molecular water-absorbent resin particles with different properties dispersed on the surface of the fluffy cotton.

For example, the first polymer layer is made of high-molecular water-absorbing resin particles with high absorption rate, such as 60S produced by Nippon Sumitomo, which is well known, and the absorption rate is high; the second polymer layer is made of polymer water-absorbent resin particles with good saturated absorption capacity effect, such as 960NP produced by Sandai of Japan, and the saturated absorption capacity is good.

The diversion trench of the paper diaper with the H-shaped core body structure can be correspondingly adjusted according to the actual size of the paper diaper.

In addition, the paper diaper body made of the core body sequentially comprises a hydrophilic hot air non-woven fabric layer, an upper coating layer, an H-shaped absorption core body, a lower coating layer, a breathable PE film and a water-repellent hot air non-woven fabric layer from inside to outside. The hydrophilic hot air non-woven fabric layer has the advantages of being fluffy and soft, good in air permeability and water permeability and the like, concave-convex lines are arranged on the surface of the hydrophilic hot air non-woven fabric layer, the concave-convex lines can play a role in guiding urine, meanwhile, the contact area of the hot air non-woven fabric layer and the skin of a baby can be reduced, and the generation rate of the red butt is effectively reduced.

The outermost hot air non-woven fabric has the characteristics of fluffy hand feeling, softness, good air permeability, good water repellency and the like.

The material of the first coating layer (upper coating layer) and the second coating layer (lower coating layer) is a hydrophilic spun-bonded nonwoven fabric in this embodiment, but the material of the upper coating layer and the lower coating layer is not limited thereto, and different materials may be used for the first coating layer (upper coating layer) and the second coating layer (lower coating layer).

But gas permeability PE membrane has fine gas permeability, has guaranteed that the infant has fine travelling comfort when dressing panty-shape diapers.

The H-shaped absorption core is a main body part for absorbing urine in the paper diaper, and sequentially comprises a core surface layer, a first macromolecule layer, a macromolecule fixing layer, namely a fluffy cotton layer, a second macromolecule layer and a core bottom layer from outside to inside.

Furthermore, go up cladding non-woven fabrics and lower cladding non-woven fabrics and be spunbonded nonwoven, and the lower cladding breadth is wider than last cladding, can guarantee like this that the macromolecule does not reveal in the production process to avoid causing the waste.

The spun-bonded non-woven fabric has the advantages of high temperature resistance, low temperature resistance, aging resistance, ultraviolet resistance, high elongation, good stability and air permeability, corrosion resistance, sound insulation, moth prevention, no toxicity and the like.

Furthermore, the surface layer of the paper diaper is made of hydrophilic hot air double-layer three-dimensional embossed non-woven fabric.

The core body of the paper diaper consists of two polymer layers, two non-woven fabric layers and a fluffy cotton layer, wherein the first non-woven fabric layer, the first polymer layer, the fluffy cotton layer, the second polymer layer and the second non-woven fabric layer are sequentially arranged from top to bottom.

The core surface layer is a hydrophilic nonwoven in this embodiment, and the core bottom layer is a water repellent spunlace nonwoven in this embodiment. The hydrophilic non-woven fabrics on core top layer has certain ability of absorbing moisture, and in the panty-shape diapers core, the hydrophilic effect of hydrophilic non-woven fabrics can make liquid conduct fast and absorb in the core. The fluffy cotton layer of polymer fixed bed promptly is used for between first macromolecular layer and the second macromolecular layer, and the primary function is for first macromolecular layer and second macromolecular layer provide the support. In this example, the polymeric anchoring layer was fluffy cotton with a grammage of 43 gsm.

In the embodiment of the present invention, the first polymer layer is the water-absorbent polymer resin particles disposed between the core surface layer and the polymer fixed layer, and similarly, the second polymer layer is the water-absorbent polymer resin particles disposed between the polymer fixed layer and the core bottom layer. Through arranging two-layer polymer layer between core surface layer and the polymer fixed bed and between polymer fixed bed and the core bottom respectively to use fluffy soft fluffy cotton, replace dustless paper with fluffy cotton and replace or the fluff pulp, thereby greatly increased the compliance of core.

Meanwhile, the whole core body is embodied as an H-shaped diversion trench and is positioned in the middle of the core body, as shown in figure 1, the concrete method for arranging the diversion trench is to select and install a slotted H-shaped mould, and extrude the core body consisting of fluffy cotton, two layers of non-woven fabrics and two layers of water-absorbing polymers out of the diversion trench at the corresponding position of the core body through the H-shaped mould before the core body is rolled; and finally, slitting according to the width requirement to form the H-shaped absorption core body, and rolling. In this embodiment, the channels include two parallel vertical channels along the length of the absorbent core and a vertical channel perpendicular to the length of the core. The front end and the rear end of each vertical diversion trench are 80mm away from the front end and the rear end of the diaper core; the distance between the outermost edges of the two vertical diversion trenches and the edge of the diaper core body in the width direction is 45 mm. The widths of the two parallel guide grooves and the vertical guide groove are both 5 mm.

In the examples of the present invention, the mass ratio of the water absorbent polymer resin particles in the first water absorbent polymer layer to the water absorbent polymer resin particles in the second water absorbent polymer layer was 5: 5.

Compared with the existing core structure, the H-shaped absorption core of the embodiment has the advantages of higher water absorption speed, more uniformity and larger water absorption capacity. When urine contacts the paper diaper, the urine is rapidly diffused along the shape of the diversion trench, so that the paper diaper worn by a baby can be kept dry and comfortable all night, and the sleep quality of the baby and the mother can be improved simultaneously. The absorption speed and the diffusion length are improved, the utilization rate of macromolecules in the paper diaper is greatly improved, and the production cost can be effectively reduced.

In another embodiment of the invention, the grammage of the fluffy cotton of the high polymer fixed layer is 40gsm, and in the H-shaped core body, the front end and the rear end of each of the two vertical diversion grooves are 78mm away from the front end and the rear end of the diaper core body; the distance between the outermost edges of the two vertical diversion trenches and the edge of the diaper core body in the width direction is 48 mm. The widths of the two parallel guide grooves and the vertical guide groove are both 8 mm. The mass ratio of the high-molecular water-absorbing resin particles in the first water-absorbing polymer layer to the high-molecular water-absorbing resin particles in the second water-absorbing polymer layer is 1: 4.

In another embodiment of the invention, the gram weight of the fluffy cotton of the high polymer fixed layer is 43gsm, and in the H-shaped core body, the front end and the rear end of each vertical diversion trench are 78mm away from the front end and the rear end of the diaper core body; the distance between the outermost edges of the two vertical diversion trenches and the edge of the diaper core body in the width direction is 45 mm. The widths of the two parallel guide grooves and the vertical guide groove are both 6 mm. The mass ratio of the high molecular water-absorbing resin particles in the first water-absorbing polymer layer to the high molecular water-absorbing resin particles in the second water-absorbing polymer layer is 3: 7 or 4: 6. The specific method of the diversion trench placement is the same as in the previous embodiment and therefore will not be described in detail. Dispersing high-molecular water-absorbing resin particles on one side of the fluffy cotton to form a second water-absorbing high-molecular layer; then spraying glue on the lower non-woven fabric and sticking the lower non-woven fabric to the second water-absorbing polymer layer; turning over the fluffy cotton, and dispersing the high-molecular water-absorbing resin particles on one side of the fluffy cotton, which is far away from the second water-absorbing high polymer layer, to form a first water-absorbing high polymer layer; spraying glue on the upper non-woven fabric and adhering the upper non-woven fabric to the first water-absorbing polymer layer;

fig. 2 shows a method for manufacturing a diaper core provided by the present invention, as shown in fig. 2, which includes the following steps:

providing a second coating layer S100 from the first supply roll 100;

spraying glue on the upper surface of the second coating layer by a glue spraying device 110S 110;

meanwhile, fluffy cotton S130 is supplied from the second supply roller 130, and the fluffy cotton is applied with the high molecular water absorbent particles S120 on a first side thereof while passing through the hopper 120;

bonding the first surface of the fluffy cotton containing the high molecular water absorbent particles with the second coating layer after spraying glue by the first bonding roller 122;

the combined fluffy cotton and the second coating layer are reversed by the turning rolls 124, 126, 128, and the high molecular water absorbent particles S140 are applied on the second surface of the fluffy cotton through the hopper 140;

at the same time, a first coating S160 is provided by the third feed roll 160;

spraying glue on the first coating layer by a glue spraying device 150S 150;

combining the first coated layer after the glue spraying with a second side of the fluffy cotton containing the high molecular water absorbent particles by a second joining roller 155S 150 to form an absorbent core body batch material of a 5-layer structure;

the batch of 5-layer structures is passed through an imprint die 170 to form H-channels S170 on the 5-layer structures.

The batch of 5-layer structure absorbent cores comprising complete H-channels is slit S180 by a slitting knife 180 to form absorbent core monomers. And then rolling the paper diaper by a core body roller 190 to prepare for use in the production of the paper diaper.

The above disclosure is directed to the preferred embodiments of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the above embodiments of the present invention without departing from the spirit of the invention.

Claims

1. A diaper core comprises an absorption core body (10) with a multilayer structure, and is characterized in that H-shaped diversion trenches (12) are formed in the absorption core body (10).

2. A diaper core according to claim 1, wherein the absorbent core (10) is of 5-layer structure, in the following order: the absorbing core body is characterized by comprising a first coating layer, a first high polymer layer, a fluffy cotton layer, a second high polymer layer and a second coating layer, wherein the H-shaped diversion trench (12) penetrates through the 5-layer structure of the absorbing core body (10).

3. The diaper core according to claim 1, wherein two vertical channels (122) of the H-shaped channels (12) are arranged along the length direction of the absorbent core, and the distance from each end of the two vertical channels (122) to the corresponding end (11, 13) of the diaper core is 78-80 mm; the distance between the outer edges of the two vertical guide grooves (122) and the edge (14) of the diaper core body in the width direction is 45-48mm, and the widths of the horizontal guide grooves (121) and the guide grooves of the two vertical guide grooves (122) are 5-8 mm.

4. The diaper core according to claim 2, wherein the weight ratio of the water-absorbent polymer particles of the first and second polymer layers is 1: 4, or 2: 3, or 1: 1.

5. The diaper core according to claim 2, wherein the first coating layer is a hydrophilic non-woven fabric added with a hydrophilic finish, and the second coating layer is a spunlace water-repellent non-woven fabric.

6. A preparation method of a paper diaper core is characterized by comprising the following steps:

providing a second cladding layer;

spraying glue on the upper surface of the second coating layer;

providing fluffy cotton, and applying high-molecular water-absorbing particles on the first surface of the fluffy cotton;

combining a first surface of fluffy cotton containing high-molecular water-absorbing particles with a second coating layer after glue spraying;

reversely combining the fluffy cotton and a second coating layer, and applying high-molecular water-absorbing particles on the second surface of the fluffy cotton;

providing a first coating layer;

spraying glue on the first coating layer;

combining the first coating layer after glue spraying with a second surface of fluffy cotton containing high-molecular water-absorbing particles to form a 5-layer structure;

and (4) passing the 5-layer structure through a stamping die to form an H-shaped diversion trench on the 5-layer structure.

7. The method for making a diaper core according to claim 6, further comprising a step of slitting the 5-layer structure containing the complete H-shaped channels to form an absorbent core body after the step of forming the H-shaped channels.