CN111249068A - Method for improving diffusion and anti-rewet performance of absorbent product by diffusion anti-rewet strengthening layer - Google Patents
Method for improving diffusion and anti-rewet performance of absorbent product by diffusion anti-rewet strengthening layer Download PDFInfo
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- CN111249068A CN111249068A CN202010036209.9A CN202010036209A CN111249068A CN 111249068 A CN111249068 A CN 111249068A CN 202010036209 A CN202010036209 A CN 202010036209A CN 111249068 A CN111249068 A CN 111249068A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53704—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having an inhibiting function on liquid propagation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53708—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
- A61F13/53713—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction the layer having a promotional function on liquid propagation in the vertical direction
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53743—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
- A61F13/53747—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer is facing the topsheet
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53743—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
- A61F13/53752—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer is embedded in the absorbent core
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/5376—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the performance of the layer, e.g. acquisition rate, distribution time, transfer time
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- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
A method for improving the diffusion and anti-rewet performance of an absorbent product by using a diffusion anti-rewet strengthening layer. The invention relates to an application method of a high-permeability anti-rewet disposable absorbent product of a high-absorption high-elasticity water-absorbent resin, which is characterized in that the square distribution gram weight of the high-absorption high-elasticity water-absorbent resin is constructed to be 0.5-15g/m at the position between a liquid-permeable top layer and an absorbent core layer of the absorbent product, the position inside the absorbent core layer or the position between an absorbent core wrapping layer and a mixed core body2The diffusion anti-rewet strengthening layer. In the process of liquid permeation and diffusion, the diffusion anti-rewet strengthening layer forms a liquid permeation and diffusion speed-increasing channel based on the absorption high-elasticity water-absorbing resin in the diffusion anti-rewet strengthening layer based on the hysteresis absorption performance of the absorption high-elasticity water-absorbing resin to liquid so as to improve the speed of liquid permeation to the absorption core layer and the diffusion area of the liquid. Meanwhile, the diffusion anti-rewet strengthening layer blocks the absorbent core layer after imbibingUnder the condition of pressure, the liquid is absorbed and captured by the capillary effect of the upward rewet towards the liquid permeable top layer, so that the dryness of the absorbent product is improved, and the absorbent product is dry and comfortable to wear.
Description
Technical Field
The invention belongs to the technical field of disposable sanitary products, and particularly relates to a method for improving the diffusion and anti-rewet performance of an absorbent product by using a diffusion anti-rewet strengthening layer.
Technical Field
Absorbent articles, also known as disposable absorbent articles or sanitary products, including diapers, sanitary napkins, pull-ups, and the like, have been widely used in personal care applications, allowing infants and other incontinent individuals to store excreta through the disposable absorbent articles and isolate the excreta from the body, clothing, bedding, and the like of the wearer, thereby improving the convenience of care and protecting the skin of the infants and other incontinent individuals.
However, the absorbent media of absorbent articles is an absorbent core, and conventional absorbent cores are made by blending fluff pulp fibers with superabsorbent resin particles. However, although the conventional absorbent core has the advantage of rapid absorption, the problem of very serious fluid rewet is also caused because the absorption of fluid by fluff pulp fibers is physical absorption, and thus, it is gradually replaced by a composite absorbent core having superior rewet resistance.
At present, the trend of the technical field is to use a composite absorption core as an absorption medium of an absorption product, and the composite absorption core has the characteristics of falling resistance, no fault, no lump, extremely ultra-thin and the like. In terms of structure, the composite absorption core is generally of a 5-layer structure, and comprises an upper covering layer, a lower covering layer and fluffy non-woven fabrics positioned between the upper covering layer and the lower covering layer from top to bottom, and granular super absorbent resin is implanted and embedded into the surface layer and the bottom layer of the fluffy non-woven fabrics respectively.
However, the super absorbent resin in the composite absorbent core will swell to become a polymer gel after absorbing liquid for the first time, and therefore the polymer gel will further swell to cause a gel blocking phenomenon in the subsequent liquid absorption process. In order to solve the problem, the common technical means in the technical field are mainly embodied in the following points: first, the method is mainly used for replacing the distribution and slotting of the upper and lower layers of the super absorbent resin, replacing the material of the upper and lower covering layers or slightly adjusting the stereoscopic impression and the gap size of the fluffy cotton.
Although the anti-rewet performance of the composite absorbent core is greatly reduced compared with the traditional mixed core body, as mentioned above, the composite absorbent core often has a colloid blocking phenomenon in the liquid absorption process, so that the rewet amount of the composite absorbent core is still large. In order to solve the technical problem, the prior art with the publication number of CN109938924A discloses a disposable absorbent product with rapid diversion absorption and anti-back-seepage, which comprises a liquid-permeable top layer, a liquid-impermeable side-leakage layer, a liquid-impermeable bottom layer, and an absorbent core arranged between the liquid-permeable top layer and the liquid-impermeable bottom layer, wherein the absorbent core is formed by connecting a super absorbent resin layer, a fluffy cotton layer and a super absorbent resin layer from top to bottom respectively, and a fluff pulp layer with the thickness of 0.2-5mm is arranged on the absorbent core and is connected with the absorbent core into a whole through a spiral hot melt adhesive layer; the fluffy cotton layer is a wavy fluffy cotton layer. The invention has the advantages of quick absorption, temporary liquid storage and quick infiltration, can effectively avoid the phenomena of urine leakage and red buttocks which are often caused by the existing disposable absorbent product, also avoids the infiltration return amount of the disposable absorbent product in the use process, improves the dryness and the comfort, and improves the use experience of the disposable absorbent product.
For another example, the prior art having publication No. CN107397628B discloses a composite absorbent core, which includes, in order from top to bottom, a surface layer, a middle layer, and a bottom layer, wherein the middle layer includes a water-absorbing layer made of a liquid-absorbing expandable material that expands after absorbing liquid, and a liquid-absorbing self-expanding liquid-guiding channel is provided in the water-absorbing layer. The invention also relates to the use of said composite absorbent core for the manufacture of absorbent articles, in particular diapers. The composite absorption core body has the advantages of good dryness, no lump, no fault and the like, and particularly, the liquid guide channel has the liquid absorption self-expansion characteristic, so that the composite absorption core body or an absorption product comprising the core body also has the advantages of high liquid infiltration and diffusion speed, small back seepage amount and the like.
However, whether the composite absorbent core is grooved or provided with the non-super absorbent resin region, the liquid diffusion performance is promoted to a certain extent, and the fundamental problem of large rewet amount of the existing composite absorbent core cannot be solved. Based on the reasons, the invention provides a method for improving the diffusion and anti-rewet performance of an absorbent product by using a diffusion anti-rewet strengthening layer, which not only effectively improves the permeation diffusion performance of the existing composite absorbent core body to liquid, but also has an unexpected technical effect on improving the anti-rewet performance of the absorbent product, and improves the dryness and comfort of the composite absorbent core body.
Disclosure of Invention
In order to overcome the technical problems of insufficient liquid permeation and diffusivity or/and large rewet amount of the absorption product in the prior art, the invention provides a method for improving the diffusion and rewet resistance of the absorption product by using a diffusion anti-rewet strengthening layer.
The invention is realized by the following technical scheme: a method for improving the diffusion and anti-rewet performance of an absorbent product by using a diffusion anti-rewet strengthening layer, wherein the absorbent product comprises a liquid-permeable top layer, a liquid-impermeable bottom layer and an absorption core layer arranged between the liquid-permeable top layer and the liquid-impermeable bottom layer; a diffusion anti-rewet strengthening layer is arranged at a position between the liquid permeability top layer and the absorption core layer or in the absorption core layer, the diffusion anti-rewet strengthening layer comprises a delayed absorption high-elasticity water-absorbent resin, and the method for constructing the diffusion anti-rewet strengthening layer by using the delayed absorption high-elasticity water-absorbent resin comprises the following steps:
And 2, spraying the stagnation-absorption high-elasticity water-absorption resin particles at the position between the liquid-permeable top layer and the absorption core layer or in the absorption core layer, so that the diffusion anti-rewet strengthening layer is formed on the surface layer of the absorption core layer or in the absorption core layer.
And 3, forming a liquid permeation and diffusion acceleration channel based on the absorption-retention high-elasticity water-absorbent resin in the diffusion anti-rewet strengthening layer based on the hysteresis absorption performance and the high gel strength of the absorption-retention high-elasticity water-absorbent resin to the liquid in the process of liquid permeation and diffusion so as to improve the speed of the liquid permeating to the absorption core layer and the diffusion area of the liquid.
And 4, the diffusion anti-rewet strengthening layer blocks the capillary effect that liquid in the absorption core layer after absorbing liquid is rewetted upwards towards the liquid permeable top layer under the pressure condition, and simultaneously captures and absorbs the liquid rewetted upwards, so that the dryness of the absorption product is improved.
Preferably, the distribution tracks of the water-absorbent resin particles with high absorption elasticity in the diffusion anti-rewet strengthening layer are uniformly distributed, and the liquid permeation diffusion acceleration channel is constructed by gaps among the water-absorbent resin particles with high absorption elasticity; the liquid which is seeped back upwards by the absorption core layer is captured and absorbed by the hysteresis absorption performance of the hysteresis absorption high elasticity water absorption resin to the liquid.
Preferably, the diffusion anti-rewet reinforcing layer is composed of a plurality of longitudinal strip-shaped diffusion anti-rewet reinforcing layers, the longitudinal strip-shaped diffusion anti-rewet reinforcing layers are arranged at intervals in the transverse width direction of the absorption product, two ends of each longitudinal strip-shaped diffusion anti-rewet reinforcing layer extend along the longitudinal length direction of the absorption product to form a longitudinal strip-shaped distribution track, gaps among the high-elasticity water-absorbent resin particles are delayed and absorbed in each longitudinal strip-shaped diffusion anti-rewet reinforcing layer, and gaps between two adjacent longitudinal strip-shaped diffusion anti-rewet reinforcing layers form the liquid permeation diffusion acceleration channel, and the liquid which is rewet upwards by the absorption core layer is captured and absorbed by the delayed absorption performance of the delayed and absorbed high-elasticity water-absorbent resin to the liquid.
Preferably, the diffusion anti-rewet reinforcing layer is composed of a plurality of transverse strip-shaped diffusion anti-rewet reinforcing layers, the transverse strip-shaped diffusion anti-rewet reinforcing layers are arranged at intervals in the longitudinal length direction of the absorption product, two ends of each transverse strip-shaped diffusion anti-rewet reinforcing layer extend along the transverse width direction of the absorption product to form a transverse strip-shaped distribution track, gaps among the high-elasticity water-absorbent resin particles are absorbed in each transverse strip-shaped diffusion anti-rewet reinforcing layer in a stagnation mode, and gaps between two adjacent transverse strip-shaped diffusion anti-rewet reinforcing layers form the liquid permeation diffusion acceleration channel, and the liquid which is rewet upwards by the absorption core layer is captured and absorbed by the hysteresis absorption performance of the high-elasticity water-absorbent resin on the liquid.
Preferably, the width of each transverse strip-shaped diffusion anti-rewet strengthening layer or each longitudinal strip-shaped diffusion anti-rewet strengthening layer is 3-45mm, and the gap between two adjacent strip-shaped diffusion anti-rewet strengthening layers is 3-30 mm.
Preferably, the hysteretic absorption property is such that the liquid absorption of the hysteretic, highly elastic water-absorbent resin is characterized by absorption of only a small amount of liquid within the first 8-10min, but exhibits a faster rate of liquid absorption after 10 min.
Preferably, the diffusion anti-rewet reinforcement layer further comprises fluffy non-woven fabric, the fluffy non-woven fabric is used as a framework, the delayed absorption high-elasticity water-absorbent resin particles are implanted and combined in a fiber mesh of the fluffy non-woven fabric to form a delayed absorption speed-raising rewet inhibition composite layer, and the delayed absorption speed-raising rewet inhibition composite layer is arranged between the liquid permeability top layer and the absorption core layer.
Preferably, the absorption core layer comprises a first covering layer, a first high water absorption resin layer, a first fluffy non-woven fabric layer, a second high water absorption resin layer and a second covering layer from top to bottom, wherein the diffusion anti-infiltration reinforcing layer is arranged between the first covering layer and the first high water absorption resin layer or/and between the first fluffy non-woven fabric layer and the second high water absorption resin layer, and the layers are compositely connected into a whole.
Preferably, a third super absorbent resin layer, a second bulky nonwoven fabric layer, a fourth super absorbent resin layer, and a third cover layer are further connected below the second cover layer, and the diffusion anti-rewet reinforcement layer is provided between the second cover layer and the third super absorbent resin layer, or/and between the second bulky nonwoven fabric layer and the fourth super absorbent resin layer, and the layers are compositely connected into a whole.
Preferably, the absorption core layer comprises an absorption core body wrapping layer and an absorption core body formed by mixing fluff pulp fibers and super absorbent resin, the diffusion anti-rewet reinforcing layer is arranged between the absorption core body wrapping layer and the mixed core body, and the diffusion anti-rewet reinforcing layer is laterally wrapped and compositely connected into a whole by the absorption core body wrapping layer.
The invention further obtains an absorption product with high diffusion permeability and anti-rewet performance by the method for improving the diffusion and anti-rewet performance of the absorption product by the diffusion anti-rewet strengthening layer, wherein the absorption product comprises a liquid permeable top layer, a liquid impermeable bottom layer and an absorption core layer arranged between the liquid permeable top layer and the liquid impermeable bottom layer, and the absorption product is structurally characterized in that the square distribution gram weight of the absorption core layer is 0.5-15g/m2The diffusion anti-rewet reinforcing layer of (2) further preferably has a square distribution grammage of 1 to 5g/m2The diffusion anti-rewet strengthening layer comprises absorption-retention high-elasticity water-absorbent resin.
Preferably, the absorbent article has a third absorption rate of physiological saline of less than 30s and a rewet of less than 2 g. In a further preferred embodiment, the rate of the third absorption of saline is less than 20s and the rewet is less than 1 g.
The invention has the following beneficial effects: the invention utilizes the absorption-stagnation high-elasticity water-absorbing resin to construct the square distribution gram weight of 0.5-15g/m at the position between the liquid-permeable top layer and the absorption core layer of the absorption product, in the absorption core layer or between the absorption core body wrapping layer and the mixed core body2The diffusion anti-rewet strengthening layer. In the process of liquid permeation and diffusion, the diffusion anti-rewet strengthening layer forms a liquid permeation and diffusion speed-increasing channel based on the absorption high-elasticity water-absorbing resin in the diffusion anti-rewet strengthening layer based on the hysteresis absorption performance of the absorption high-elasticity water-absorbing resin to liquid so as to improve the speed of liquid permeation to the absorption core layer and the diffusion area of the liquid. Meanwhile, the diffusion anti-rewet strengthening layer blocks the capillary effect that liquid in the absorption core layer after absorbing liquid is rewetted upwards towards the direction of the liquid permeable top layer under the condition of pressure, and simultaneously catches and absorbs the liquid rewetted upwards, so that the dryness of the absorption product is improved.
Drawings
FIG. 1 is a diagram showing the static absorption of a liquid by an intake highly elastic water-absorbent resin.
FIG. 2 is a graph of the static absorption of liquid by an absorbent marble.
Fig. 3 is a schematic structural view of a prior art absorbent article.
Figure 4 is a schematic view of a diffusion anti-rewet enhancement layer positioned between a liquid permeable top layer and an absorbent core layer.
FIG. 5 is a schematic diagram showing the distribution locus of the particles of the diffusion anti-rewet reinforcing layer in which the highly elastic water-absorbent resin is uniformly retained.
Figure 6 is a schematic view of a diffusion anti-rewet enhancement layer disposed within an absorbent core layer.
FIG. 7 is a schematic diagram of the distribution trace of the longitudinal stripe-shaped diffusion anti-rewet strengthening layer in the diffusion anti-rewet strengthening layer.
Figure 8 is a schematic view of a diffusion anti-rewet reinforcement layer disposed between a wrapsheet and an absorbent core.
FIG. 9 is a schematic structural view of a stagnation acceleration/reverse osmosis suppressing composite layer.
Detailed Description
The diffusion anti-rewet reinforcing layer described in the present application is formed of a water-absorbent resin having high elasticity and delayed absorption properties, that is, the diffusion anti-rewet reinforcing layer is formed by uniformly distributing water-absorbent resin particles, but the water-absorbent resin is different from a super-absorbent resin conventionally used for an absorbent core of a disposable absorbent article. In distinction from superabsorbent resins (SAP) used in absorbent cores, the present application defines a water-absorbent resin having high elasticity and hysteretic absorption as a superabsorbent resin.
The super absorbent resin used as the absorption medium of the absorption core has the following absorption performance: firstly, the liquid (such as physiological saline or artificial urine) has high absorption rate, high water retention rate, high absorption rate, high pressure absorbability and high pass-through night performance; secondly, in order to increase the absorption rate of the super absorbent resin, the particle size distribution range is 106-620 microns, the average particle size is 280-320 microns, and the surface is in an irregular shape; thirdly, the absorbent articles are developed towards ultra-thinning for the breathability and comfort of the absorbent articles, and accordingly, the existing super absorbent resin must have the above-mentioned absorption performance, especially, the absorption rate should be as fast as possible, and the absorption rate of the super absorbent resin should be generally below 28 seconds, and more preferably below 20 seconds, so as to ensure that the absorbent articles do not have the problems of front leakage, back leakage or side leakage during the use process.
However, unlike the conventional high water-absorbent resin, the absorption-retarding high elastic water-absorbent resin used as the diffusion anti-rewet strengthening layer of the present invention should satisfy the following performance requirements: one, it should have excellent colloidal strength and still have high elasticity (i.e. high gel strength or high strength) even after imbibing liquid, and the other, it should have slow-then-fast absorption or/and slow-absorption effect, that is, the water-absorbent resin only absorbs a small amount of liquid within the first 8-10min, so that pores with larger pore diameters are formed between the water-absorbent resin particles or between the water-absorbent resin colloid particles, and developed and efficient flow guide channels are formed, thereby enhancing the diffusion and permeation of the liquid and promoting the flow guide effect, and simultaneously, shows a faster absorption rate to liquid after 10min, enhances the capture of the water-absorbent resin and then absorbs the effect of slowly permeating the liquid from the absorption core body upwards under the action of pressure, constructs an anti-back-permeation water-absorbing network, thereby strengthening the anti-rewet performance without special limitation on the absorption rate and the pressure absorption performance; thirdly, the particle size distribution range of the water-absorbing resin with high absorption and elasticity is larger than 620 microns, the more ideal particle size distribution is 1000-3000 microns, and meanwhile, the surface of the water-absorbing resin is in a regular spherical shape.
In specific embodiments, the water-absorbent resin with high absorption and elasticity in the present application can be a sodium polyacrylate crosslinked copolymer, such as: the water-absorbing resin with high absorption and elasticity provided by Puli Deg (Zhongshan) new material company Limited and the type of the water-absorbing resin is 1.5-2.0, the speed of absorbing normal saline is shown in figure 1, the water-absorbing resin with high absorption and elasticity per gram unit only absorbs 8g/g in the first 9min, but the speed of absorbing liquid is greatly accelerated after 9min, and the multiplying power of the water-absorbing resin with high absorption and elasticity is respectively 18g/g, 32g/g, 42g/g and 46g/g at 12min, 15min, 18min and 25 min.
The water absorption marble (commonly called crystal baby) also belongs to the water absorption marble with high absorption elasticity and also belongs to the sodium polyacrylate cross-linked copolymer, therefore, in the specific embodiment, the water absorption marble with high absorption elasticity in the application can also be directly purchased from the market, the water absorption marble can slowly grow in water, the speed of absorbing normal saline is shown in figure 2, the water absorption marble with high absorption elasticity per gram unit only absorbs 7g/g in the first 9min, but the speed of absorbing liquid is greatly accelerated after 9min, and the multiplying power of absorbing liquid is respectively 15g/g, 28g/g, 38g/g and 41g/g at 12min, 15min, 18min and 25 min.
The present application further refers to the prior art with publication No. CN202330162 (a testing apparatus for gel strength of super absorbent resin) to test the gel strength of the absorption-retention super absorbent resin, and the test conditions are as follows: 1. respectively placing a certain amount of the absorption-retention high-elasticity water-absorbent resin and the high-water-absorbent resin in a beaker, and then pouring 20 times of physiological saline, namely the absorption capacity is 20 times; 2. transferring the colloid into a colloid storage cylinder for testing; 3. selecting a screen with the diameter of 0.5mm, using a tensile machine to press the pressing block downwards for a distance of 3cm and calculating the pressure intensity by the bottom area of the pressing block, wherein the pressure intensity is used for representing the compression modulus of the gel, the larger the numerical value is, the stronger the gel strength is, the higher the colloid elasticity is, and the results (the average value of three times of tests) are as follows:
| categories | Gel Strength (KPa) |
| Stagnation-absorption high-elasticity water-absorbent resin | 5.73 |
| Water-absorbing marble | 4.58 |
| High water absorption resin | 1.42 |
Meanwhile, the water-absorbent resin gel with high absorption elasticity and the water-absorbent marble gel are observed by naked eyes, the appearance of the water-absorbent resin gel and the water-absorbent marble gel are both spherical colloids, and the water-absorbent resin gel shows high elasticity when being pinched by hands, while the super absorbent resin gel shows irregular shape and shows viscosity when being pinched by hands.
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, 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.
Example 1
As shown in fig. 3, the conventional absorbent article includes a liquid-permeable top sheet 5, a liquid-impermeable back sheet 1, and an absorbent core layer 4 disposed between the liquid-permeable top sheet and the liquid-impermeable back sheet. In addition, on both sides in the longitudinal direction of the absorbent article, side leakage barriers 3 are provided, respectively, as well as a closure system and an elastic system, such as an elastic waist band, for the purpose of wearing and comfort. Wherein, the liquid-tight bottom layer 1 is formed by compounding a breathable bottom film 11 and a spun-bonded non-woven fabric 12.
The existing absorption products are generally ultrathin products, so no matter a composite core or a traditional fluff pulp/super absorbent resin mixed core is adopted, the absorption products realize ultrathin effect by increasing the addition amount of the super absorbent resin in an absorption core layer, but after the addition amount of the super absorbent resin is increased, once the super absorbent resin absorbs liquid and expands, a colloid blocking phenomenon is easily generated, subsequent liquid is difficult to permeate and diffuse, side leakage and seepage are caused, and meanwhile, the back seepage amount is large.
As shown in fig. 4, in this embodiment, the absorption-stagnation high-elasticity water-absorbent resin is used to improve the permeation diffusion and anti-rewet performance of the absorbent article, and the structural feature thereof is that a diffusion anti-rewet reinforcing layer 6 is arranged between the liquid-permeable top layer 5 and the absorption core layer 4, and the diffusion anti-rewet reinforcing layer 6 is made of absorption-stagnation high-elasticity water-absorbent resin 61, and is implemented by the following manner:
the method for constructing the diffusion anti-rewet strengthening layer 6 by using the water-absorbing resin 61 with high absorption elasticity comprises the following steps:
And 2, spraying the particles of the absorption-stagnation high-elasticity water-absorbent resin 61 at the position between the liquid-permeable top layer 5 and the absorption core layer 4, so that the diffusion anti-rewet strengthening layer 6 is formed on the surface layer of the absorption core layer 4.
As shown in FIG. 5, as a specific embodiment, in the diffusion anti-rewet reinforcing layer 6, the distribution locus of the particles of the delayed absorption high elastic water-absorbent resin 61 is set to be uniformly distributed.
The uniform distribution locus of the step is only a preferred embodiment of the present embodiment, that is, besides uniform distribution, the distribution locus may also have other shapes.
And 3, in the process of liquid permeation and diffusion, forming a liquid permeation and diffusion acceleration channel based on the absorption-retarding high-elasticity water-absorbent resin in the diffusion anti-rewet strengthening layer 6 based on the hysteresis absorption performance and the high gel strength of the absorption-retarding high-elasticity water-absorbent resin 61 on the liquid so as to improve the speed of the liquid permeating into the absorption core layer and the diffusion area of the liquid.
In the embodiment, the liquid permeation diffusion acceleration channel is constructed by gaps among the particles of the absorption-resistant high-elasticity water-absorbent resin in the diffusion anti-rewet strengthening layer 6.
And 4, the diffusion anti-rewet strengthening layer 6 blocks the capillary effect that liquid in the absorption core layer after absorbing liquid is rewetted upwards towards the liquid-permeable top layer under a pressure condition, and meanwhile, the liquid rewetted upwards by the absorption core layer 4 is captured and absorbed by the hysteresis absorption performance of the absorption-delaying high-elasticity water-absorbing resin 61 on the liquid, so that the dryness of the absorption product is improved.
It should be noted that the structure or type of the absorbent core layer 4 is not particularly limited in this embodiment, and may be a composite absorbent core or a fluff pulp/superabsorbent resin mixed core.
As shown in fig. 4, the absorption product of the present embodiment utilizes the absorption-retarding high elastic water-absorbent resin to improve the permeation diffusion and anti-rewet performance of the absorption product, and further obtains a high diffusion permeability and anti-rewet performance, the absorption product includes a liquid-permeable top layer 5, a liquid-impermeable bottom layer 1 and an absorption core layer 4 disposed between the liquid-permeable top layer 5 and the liquid-impermeable bottom layer 1, and the structure of the absorption product is characterized in that a square distribution gram weight of 4g/m is disposed between the liquid-permeable top layer 5 and the absorption core layer 42The diffusion anti-rewet strengthening layer 6 is composed of the delayed absorption high-elasticity water-absorbent resin 61, and the distribution track of the particles of the delayed absorption high-elasticity water-absorbent resin 61 is uniform.
The absorption rate of the absorption product is used for representing the penetration and diffusion performance of the absorption product because the absorption product is easy to generate colloid blocking phenomenon in the liquid absorption process, so that the problems of difficult diffusion and permeation of the third liquid adding, low absorption rate, leakage, side leakage and the like are caused. The absorbent article of this example was tested for absorption rate and rewet and the results were: the absorbent article has a third absorption rate of physiological saline of 15s, a rewet of 0.21g, and maximum and minimum diffusion lengths of 352cm and 321cm, respectively. Through trial test, a test user evaluates that the absorbent product has excellent dryness and comfort, is dry and comfortable to wear, does not have the phenomena of eczema and erythra of the skin, and has unexpected use effect.
Example 2
The method of constructing a diffusion anti-rewet reinforcing layer 6 using water-absorbing marbles 65 of this example refers to example 1, wherein the grammage of the square distribution of the water-absorbing marbles 65 is 2g/m2。
This example differs from example 1 in that it further provides a preferred embodiment of a diffusion anti-rewet enhancement layer 6 in the absorbent core layer, as shown in figure 6. Specifically, the absorption core layer is a composite absorption core layer 4A, which includes, from top to bottom, a first cover layer 41, a first super absorbent resin layer 42, a first bulky nonwoven fabric layer 43, a second super absorbent resin layer 44, and a second cover layer 45, and the structural features of this embodiment are: the diffusion anti-back-seepage strengthening layer 6 is arranged between the first covering layer 41 and the first high water absorption resin layer 42, and the layers are combined and connected into a whole through a heat seal or gluing process.
As a specific embodiment of the diffusion anti-rewet strengthening layer 6 of the present embodiment, as shown in fig. 7, the diffusion anti-rewet strengthening layer 6 of the present embodiment is composed of a plurality of longitudinal strip-shaped diffusion anti-rewet strengthening layers 62, 63, and 64, and the square distribution gram weight of the water-absorbing marbles 65 in the longitudinal strip-shaped diffusion anti-rewet strengthening layers 62, 63, and 64 is 2g/m2. The longitudinal strip-shaped diffusion and anti-rewet strengthening layers 62, 63 and 64 are arranged at intervals in the transverse width direction of the absorbent article, specifically, the width of each longitudinal strip-shaped diffusion and anti-rewet strengthening layer is 3-45mm, more preferably 15-35mm, and in this embodiment, preferably 30mm, and the gap 81 between the longitudinal strip-shaped diffusion and anti-rewet strengthening layers 62 and 63, and the gap 82 between the longitudinal strip-shaped diffusion and anti-rewet strengthening layers 63 and 64 are 3-30mm, more preferably 10-25mm, and in this embodiment, preferably 20 mm.
The longitudinal strip-shaped diffusion anti-rewet strengthening layers 62, 63 and 64 of the present embodiment extend along the longitudinal length direction of the absorbent article to form longitudinal strip-shaped distribution traces. Gaps among the particles of the high elastic water-absorbent resin 61 are absorbed in each longitudinal strip-shaped diffusion and anti-rewet strengthening layer, and the gaps 81 and the gaps 82 form the liquid permeation and diffusion acceleration channel. The liquid rewet upwardly of the absorbent core is captured and absorbed by the delayed absorption of liquid by the absorbent marble 65.
In the embodiment, the absorption high elasticity water-absorbent resin is utilized to improve the permeation diffusion and anti-rewet performance of the absorption product, and the absorption product with high diffusion permeability and anti-rewet performance is obtained on the basis of the existing absorption product. As shown in fig. 3, 6 and 7, the absorbent product comprises a liquid-permeable top layer 5, a liquid-impermeable bottom layer 1 and a composite absorbent core layer 4A arranged between the liquid-permeable top layer 5 and the liquid-impermeable bottom layer 1, and is structurally characterized in that a square distribution is arranged inside the composite absorbent core layer 4AThe gram weight is 2g/m2The diffusion anti-back-seepage strengthening layer 6 is characterized in that the diffusion anti-back-seepage strengthening layer 6 is composed of a plurality of longitudinal strip-shaped diffusion anti-back-seepage strengthening layers 62, 63 and 64, and water-absorbing marble grease particles are uniformly distributed in the longitudinal strip-shaped diffusion anti-back-seepage strengthening layers 62, 63 and 64.
The absorbent article of this example was tested for absorption rate and rewet and the results were: the absorbent article of this example absorbed physiological saline for the third time at a rate of 14s, had a rewet of 0.63g and had maximum and minimum diffusion lengths of 336cm and 318cm, respectively. Through trial test, a test user evaluates that the absorbent product has excellent dryness and comfort, is dry and comfortable to wear, does not have the phenomena of eczema and erythra of the skin, and has unexpected use effect.
As another implementation manner of this embodiment, the diffusion anti-rewet strengthening layer is composed of a plurality of transverse strip-shaped diffusion anti-rewet strengthening layers, the transverse strip-shaped diffusion anti-rewet strengthening layers are arranged at intervals in the longitudinal length direction of the absorbent article, and two ends of the transverse strip-shaped diffusion anti-rewet strengthening layers extend along the transverse width direction of the absorbent article to form a transverse strip-shaped distribution track. Gaps among the particles of the water-absorbing resin with high absorption elasticity in each transverse strip-shaped diffusion anti-rewet strengthening layer and gaps between two adjacent transverse strip-shaped diffusion anti-rewet strengthening layers form the liquid permeation diffusion acceleration channel, and the liquid which is absorbed by the absorption core layer and seeps upwards is captured and absorbed by the hysteresis absorption performance of the water-absorbing resin with high absorption elasticity.
In other embodiments of this embodiment, the structure of the composite absorbent core further comprises: and a third high-water-absorption resin layer, a second fluffy non-woven fabric layer, a fourth high-water-absorption resin layer and a third covering layer are connected below the second covering layer, and the diffusion anti-infiltration reinforcing layer is arranged between the second covering layer and the third high-water-absorption resin layer or/and between the second fluffy non-woven fabric layer and the fourth high-water-absorption resin layer, and the layers are combined and connected into a whole.
Example 3
Construction of diffusion anti-rewet strengthening layer Using the retarded highly elastic Water-absorbent resin 61 of this exampleMethod of 6 referring to example 1, wherein the water-absorbent resin 61 having a water-absorbent capacity of 3g/m in terms of square distribution of grammage2。
As shown in FIG. 8, the difference between this embodiment and embodiment 2 is that the absorbent core layer of the absorbent article of this embodiment uses a mixed core 4B of fluff pulp 72/super absorbent resin 71, and the absorbent core 4B is laterally wrapped by an absorbent core wrapping layer 7, which on the one hand improves the dry and wet strength of the mixed core 4B and on the other hand avoids leakage of the super absorbent resin.
As shown in fig. 8, the structural feature of this embodiment is that the diffusion anti-rewet reinforcing layer 6 is disposed between the absorption core wrapping layer 7 and the hybrid core, and the absorption core wrapping layer 7 is used to perform a lateral cladding composite connection on the hybrid core 4B and the diffusion anti-rewet reinforcing layer 6 on the hybrid core 4B.
In the embodiment, on the basis of the existing absorption product, the absorption-retention high-elasticity water-absorbent resin is used for improving the permeation diffusion performance and the anti-rewet performance of the absorption product, so that the absorption product with high diffusion permeability and anti-rewet performance is obtained. As shown in the attached figures 3 and 8, the absorbent product comprises a liquid permeable top layer 5, a liquid impermeable bottom layer 1 and a mixed core 4B arranged between the liquid permeable top layer 5 and the liquid impermeable bottom layer 1, and is structurally characterized in that a square distribution grammage of 3g/m is arranged between an absorption core wrapping layer 7 and the mixed core 4B formed by uniformly mixing fluff pulp 72 and super absorbent resin 712The diffusion anti-rewet strengthening layer 6, the diffusion anti-rewet strengthening layer 6 is composed of the particles of the water-absorbing resin 61 with high absorption elasticity and evenly distributed (distributed track).
The absorbent article of this example was tested for absorption rate and rewet and the results were: the absorbent product has the third time absorption rate of the normal saline of 12s, the back seepage quantity of 0.45g, the maximum diffusion length and the minimum diffusion length of 342cm and 314cm respectively, and the dryness and the comfort of the absorbent product are excellent. Through trial test, a test user evaluates that the skin is dry and comfortable, does not have the phenomena of eczema and erythra of the skin, and has unexpected use effect.
Example 4
This example provides a further embodiment of the diffusion anti-rewet enhancement layer of example 1. As shown in fig. 9, the diffusion anti-rewet reinforcing layer 6 of the present embodiment includes a bulky nonwoven fabric 9 in addition to the water-absorbent resin 61 having high water absorption and retention properties. Specifically, the fluffy non-woven fabric 9 is used as a framework, the particles of the delayed absorption high elasticity water absorption resin 61 are implanted and combined in the fiber net of the fluffy non-woven fabric 9 to form a diffusion anti-rewet reinforcing layer composite layer 10, and the diffusion anti-rewet reinforcing layer composite layer 10 is arranged between the liquid permeability top layer 5 and the absorption core layer 4. The absorbent core layer 4 may be the composite absorbent core layer of example 2 or the hybrid core of example 3.
The embodiment has the beneficial effects that on one hand, the fluffy non-woven fabric 9 can fix the particles of the absorption-retarding high-elasticity water-absorbing resin 61, so that the scattering and leakage are avoided, the production line is easy to implement, and on the other hand, the diffusion anti-rewet strengthening layer composite layer 10 improves the wet strength of the whole absorbing product; meanwhile, the permeation diffusion performance of the liquid permeation diffusion acceleration channel to liquid is enhanced, and the anti-rewet performance is improved.
As shown in the attached figures 4 and 9, the present example provides an absorbent article with high diffusion permeability and anti-rewet property based on example 1, which comprises a liquid permeable top sheet 5, a liquid impermeable back sheet 1 and an absorbent core layer 4 arranged between the liquid permeable top sheet 5 and the liquid impermeable back sheet 1, and is structurally characterized in that a square distribution grammage of 4g/m is arranged between the liquid permeable top sheet 5 and the absorbent core layer 42The diffusion anti-rewet strengthening layer composite layer 10.
The absorbent article of this example was tested for absorption rate and rewet and the results were: the absorbent product has the third time absorption rate of the normal saline of 10s, the back seepage quantity of 0.16g, the maximum diffusion length and the minimum diffusion length of 370cm and 339cm respectively, and the dryness and the comfort of the absorbent product are excellent. Through trial test, a test user evaluates that the skin is dry and comfortable, does not have the phenomena of eczema and erythra of the skin, and has unexpected use effect.
Performance testing
The test method comprises the following steps:
1. the method for testing the permeation and diffusion performance of the absorbent product to the physiological saline specifically comprises the following steps:
step 1: taking 3 parts of filter paper with the diameter of 11cm, weighing and recording as M01、M02、M03And standing by.
Step 2: preparing physiological saline (or artificial urine) as test liquid, and measuring 3 parts of 100ml liquid by using a measuring cylinder for later use;
and step 3: straightening and flattening a sample of the absorbent product to be tested, laying the sample on a test board, and marking the central point of the absorbent product according to the length and the width of the absorbent product;
and 4, step 4: placing the test holder over the absorbent article sample to be tested such that the opening of the test funnel is directly above the central point and aligned with the central point;
and 5: injecting 100ml of normal saline into a test funnel, starting a liquid adding switch to allow liquid to permeate into a sample of the absorbent product to be tested, synchronously starting timing according to a stopwatch, finishing timing when the normal saline completely penetrates the sample of the absorbent product to be tested, namely when the liquid on the liquid permeable top layer disappears, and recording the first permeation time T1;
step 6: repeating the step (5) after 10min, and recording the second permeation time T2;
and 7: repeating the step (5) for 10min, and recording the third permeation time T3;
and 8: after the step (7) is finished for 5min, the standard weight is M01、M02、M03The filter papers are respectively placed at the front, middle and rear positions of the absorbent product, a 3kg pressing block is placed on each filter paper, and timing is started;
and step 9: discharging the pressing block after the time of the step (8) reaches 5min, and aligning M01、M02、M03Weighed separately, marked M11、M12、M13(ii) a The longitudinal maximum diffusion length and the longitudinal minimum diffusion length of the liquid are measured simultaneously.
Step 10: calculating the liquid back-seepage quantity M: m ═ M (M)11-M01)+(M12-M02)+(M13-M03)
2. And (3) judging dryness:
the method for combining 10 test products of the absorbent products and 10 comparative samples into one test product, rewarding 20 test users by arranging substances, and requiring to faithfully record the use conditions of the test products and the comparative samples of the absorbent products comprises the following steps: dryness, leakage, side leakage, skin eczema, and erythra.
(II) testing samples:
l-shaped absorbent article test articles prototyped according to examples 1-4; a common absorbent article having a composite absorbent core is commercially available as a comparative sample.
(III) the test results are as follows:
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 to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above 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 as defined by the appended claims.
Claims (10)
1. A method for improving the diffusion and anti-rewet performance of an absorbent product by using a diffusion anti-rewet strengthening layer, wherein the absorbent product comprises a liquid-permeable top layer, a liquid-impermeable bottom layer and an absorption core layer arranged between the liquid-permeable top layer and the liquid-impermeable bottom layer; a diffusion anti-rewet strengthening layer is arranged at a position between the liquid permeability top layer and the absorption core layer or in the absorption core layer, the diffusion anti-rewet strengthening layer comprises a delayed absorption high-elasticity water-absorbent resin, and the method for constructing the diffusion anti-rewet strengthening layer by using the delayed absorption high-elasticity water-absorbent resin comprises the following steps:
step 1, selecting the square distribution gram weight of the absorption-retention high-elasticity water-absorbent resin as0.5-15g/m2；
Step 2, arranging the stagnation-absorption high-elasticity water-absorbent resin particles at a position between the liquid-permeable top layer and the absorption core layer or in the absorption core layer, so that the diffusion anti-rewet strengthening layer is formed on the surface layer of the absorption core layer or in the absorption core layer;
step 3, in the process of liquid permeation and diffusion, forming a liquid permeation and diffusion acceleration channel based on the absorption-retention high-elasticity water-absorbent resin in the diffusion anti-rewet strengthening layer based on the hysteresis absorption performance and the high gel strength of the absorption-retention high-elasticity water-absorbent resin to liquid so as to improve the speed of liquid permeating into the absorption core layer and the diffusion area of the liquid;
and 4, the diffusion anti-rewet strengthening layer blocks the capillary effect that liquid in the absorption core layer after absorbing liquid is rewetted upwards towards the liquid permeable top layer under the pressure condition, and simultaneously captures and absorbs the liquid rewetted upwards, so that the dryness of the absorption product is improved.
2. The method of improving the diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer as in claim 1, wherein: the distribution tracks of the water-absorbent resin particles with high absorption elasticity in the diffusion anti-rewet strengthening layer are uniformly distributed, and the liquid permeation diffusion acceleration channel is constructed by gaps among the water-absorbent resin particles with high absorption elasticity; the liquid which is seeped back upwards by the absorption core layer is captured and absorbed by the hysteresis absorption performance of the hysteresis absorption high elasticity water absorption resin to the liquid.
3. The method of improving the diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer as in claim 1, wherein: the diffusion anti-rewet strengthening layer is composed of a plurality of longitudinal strip-shaped diffusion anti-rewet strengthening layers, the longitudinal strip-shaped diffusion anti-rewet strengthening layers are arranged at intervals in the transverse width direction of the absorption product, two ends of each longitudinal strip-shaped diffusion anti-rewet strengthening layer extend along the longitudinal length direction of the absorption product to form a longitudinal strip-shaped distribution track, gaps among high-elasticity water-absorbing resin particles are absorbed in each longitudinal strip-shaped diffusion anti-rewet strengthening layer in a stagnation mode, gaps among two adjacent longitudinal strip-shaped diffusion anti-rewet strengthening layers form the liquid permeation diffusion acceleration channel, and liquid which is rewetted upwards by the absorption core layer is captured and absorbed by the hysteresis absorption performance of the high-elasticity water-absorbing resin on the liquid.
4. The method of improving the diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer as in claim 1, wherein: the diffusion anti-rewet strengthening layer is composed of a plurality of transverse strip-shaped diffusion anti-rewet strengthening layers, the transverse strip-shaped diffusion anti-rewet strengthening layers are arranged at intervals in the longitudinal length direction of the absorption product, two ends of each transverse strip-shaped diffusion anti-rewet strengthening layer extend along the transverse width direction of the absorption product to form a transverse strip-shaped distribution track, gaps among high-elasticity water-absorbing resin particles are absorbed in each transverse strip-shaped diffusion anti-rewet strengthening layer in a stagnation mode, gaps among two adjacent transverse strip-shaped diffusion anti-rewet strengthening layers form the liquid permeation diffusion acceleration channel, and liquid which is rewetted upwards by the absorption core layer is captured and absorbed by the hysteresis absorption performance of the high-elasticity water-absorbing resin on the liquid.
5. The method of enhancing diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer as claimed in claim 3 or 4, wherein: the width of the strip-shaped diffusion anti-rewet strengthening layer is 3-45mm, and the gaps between two adjacent strip-shaped diffusion anti-rewet strengthening layers are 3-30 mm.
6. The method of enhancing diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer according to any of claims 2-4, wherein: the hysteresis absorption performance is that the hysteresis absorption high elasticity water absorption resin absorbs liquid slowly within the first 8-10min, but shows a faster absorption rate to the liquid after 10 min.
7. The method of improving the diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer as in claim 1, wherein: the diffusion anti-rewet strengthening layer further comprises fluffy non-woven fabric, the fluffy non-woven fabric is used as a framework, the stagnation-absorption high-elasticity water-absorbent resin particles are implanted and combined in a fiber mesh of the fluffy non-woven fabric to form a stagnation-absorption speed-raising rewet restraining composite layer, and the stagnation-absorption speed-raising rewet restraining composite layer is arranged between the liquid permeability top layer and the absorption core layer.
8. The method of improving the diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer as in claim 1, wherein: the absorbing core layer comprises a first covering layer, a first high-water-absorptivity resin layer, a first fluffy non-woven fabric layer, a second high-water-absorptivity resin layer and a second covering layer from top to bottom, wherein the diffusing anti-infiltration reinforcing layer is arranged between the first covering layer and the first high-water-absorptivity resin layer or/and the first fluffy non-woven fabric layer and the second high-water-absorptivity resin layer, and the layers are connected into a whole in a compounding mode.
9. The method of improving the diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer as in claim 1, wherein: the absorption core layer comprises an absorption core body wrapping layer and a mixed core body formed by mixing fluff pulp fibers and super absorbent resin, wherein the diffusion anti-rewet strengthening layer is arranged between the absorption core body wrapping layer and the mixed core body and is laterally wrapped and compositely connected into a whole by the absorption core body wrapping layer.
10. The method of enhancing diffusion and rewet resistance of an absorbent article with a diffusion anti-rewet enhancement layer according to any of claims 1-4 and 7-9, wherein: the absorbent article absorbs the physiological saline for the third time at a rate of less than 30s and has a rewet of less than 1 g.
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