CN113116638A - Moisture-permeable soft composite core and preparation method thereof - Google Patents

Moisture-permeable soft composite core and preparation method thereof Download PDF

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Publication number
CN113116638A
CN113116638A CN202110453444.0A CN202110453444A CN113116638A CN 113116638 A CN113116638 A CN 113116638A CN 202110453444 A CN202110453444 A CN 202110453444A CN 113116638 A CN113116638 A CN 113116638A
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woven fabric
composite core
moisture
absorbent resin
super absorbent
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CN202110453444.0A
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CN113116638B (en
Inventor
劳海晴
方瑞峰
张素晶
张宇皓
赵苑婷
李肖斌
钱程
李书卿
韩万里
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Jiaxing University
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Jiaxing University
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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
    • A61F13/15577—Apparatus or processes for manufacturing
    • 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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
    • 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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/475—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means
    • 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

Abstract

The invention discloses a moisture-permeable soft composite core and a preparation method thereof, and relates to the technical field of disposable hygienic products. The invention provides a moisture-permeable soft composite core and a preparation method thereof, wherein the moisture-permeable soft composite core is prepared by jointly using a bottom layer non-woven fabric, fiber fluff, a super absorbent resin and an upper layer non-woven fabric, wherein the fiber fluff is fixed on the bottom layer non-woven fabric by an electrostatic flocking method, the super absorbent resin is uniformly dispersed among the fiber fluff, and the upper layer non-woven fabric is fixedly combined with the fiber fluff, so that the prepared moisture-permeable soft composite core has good softness, and the super absorbent resin after water absorption has enough space to generate swelling, thereby improving the utilization rate of the super absorbent resin in the composite core, reducing the using amount of the super absorbent resin in the composite core and simultaneously lowering the production cost.

Description

Moisture-permeable soft composite core and preparation method thereof
Technical Field
The invention relates to the technical field of disposable hygienic products, in particular to a moisture-permeable soft composite core and a preparation method thereof.
Background
Sanitary napkins are absorbent materials used to absorb menstrual blood in women during their menstrual period. Because the women can present certain angle with the sanitary towel body when using sanitary towel, produce the friction with the groin portion of human body more easily, consequently use soft material's sanitary towel more welcome by the women.
The existing sanitary towel is generally of a multilayer structure, and comprises a surface layer, a flow guide layer, an absorption core layer and a bottom layer from top to bottom in sequence, wherein a separation edge is arranged on the side surface of the sanitary towel for preventing side leakage. Wherein, the prior surface layer and the diversion layer are generally made of hot air non-woven fabrics or spunlace non-woven fabrics, the side leakage prevention separation edges are made of SMS non-woven fabrics, and the non-woven fabrics are soft in hand feeling; the bottom layer material is 15-25g/m2The PE film is made, so that the flexibility is good; the middle absorption core layer is generally in two forms, one is a mixture of cotton pulp and super absorbent resin SAP, and the other is dust-free paper containing super absorbent resin, the former has the advantages of high absorption speed and large absorption capacity, but has poor air permeability when being used, is thick and solid, is not favored by young women, and the latter has the advantage of thinner thickness, but the super absorbent resin is fixed in the middle of the dust-free paper in the form of inclusion hot melt adhesive, so that the hand feeling of the dust-free paper is relatively hard; in addition, without the mediation of wood pulp, the superabsorbent located in the middle of the absorbent core is easily causedThe resin is absorbed and saturated, the edge part is not fully utilized due to no flow guide of wood pulp, and the phenomenon that although the usage amount of the super absorbent resin is large, the absorption capacity cannot be improved exists.
In the process of implementing the invention, the inventor finds that the following problems exist in the related art:
the existing ultrathin sanitary towel is realized by adopting dust-free paper containing super absorbent resin in an absorption core layer, but the problems of poor handfeel, large using amount of the super absorbent resin and low utilization rate of the super absorbent resin are inevitable.
Disclosure of Invention
The invention mainly aims to provide a moisture-permeable soft composite core and a preparation method thereof, which are used for solving the technical problem that the utilization rate of a composite core to super absorbent resin is low in the prior art and achieving the technical effect of improving the utilization rate of the composite core to the super absorbent resin. The technical scheme of the invention is as follows:
according to a first aspect of embodiments of the present invention, there is provided a method for manufacturing a moisture vapor permeable soft type composite core, the method comprising:
fixing fiber fluff on the upper surface of the bottom non-woven fabric by adopting an electrostatic flocking method to obtain a fluff-containing non-woven fabric;
sending the non-woven fabric containing the velvet into an oven for pre-drying and reinforcing, wherein the pre-drying temperature adopted in the pre-drying and reinforcing process is 80-90 ℃, and the pre-drying time is 3-5 min;
spraying super absorbent resin on the upper surface of the pre-dried and reinforced fleece-containing non-woven fabric, wherein the super absorbent resin is 20-40 meshes, and the spraying amount is 10-25g/m2；
Compounding the fleece-containing non-woven fabric sprayed with the super absorbent resin with the upper non-woven fabric to obtain a composite core semi-finished product, then sending the composite core semi-finished product to an oven for drying and compounding, and cooling and winding to obtain a moisture-permeable soft composite core finished product, wherein the pre-drying temperature adopted in the drying and compounding process is 110-2A thickness of2.25-3.12mm。
In a preferred embodiment, the step of fixing the fiber fluff on the upper surface of the base nonwoven fabric by electrostatic flocking to obtain the fluff-containing nonwoven fabric comprises:
putting fiber fluff with the length of 1.5-3mm and the linear density of 1.5-3D into finishing liquid, soaking for 25-40min, wherein the temperature of the finishing liquid is 45-55 ℃, and the bath ratio is 1: 30-40, wherein the finishing liquid comprises the following components in percentage by weight: 0.5-1wt% of penetrating agent JFC and 2-5wt% of K2SO42-4wt% of non-ionic antistatic agent, 3-6 wt% of silica sol, 2-4wt% of MgCl21-3 wt% of softening agent, 0.5-2.5 wt% of glacial acetic acid and the balance of water; wherein, the concentration of the silicon dioxide in the silica sol is 10-15 wt%, and the average particle size of the silicon dioxide is 10-20 μm;
drying the soaked fiber fluff to enable the water content of the fiber fluff to be 5-8 wt%, wherein the specific resistance of the fiber fluff after drying is 8' 107-9´108Ω·cm；
After coating flocking adhesive on the bottom non-woven fabric, sending the non-woven fabric to a high-voltage electrostatic field, wherein the coating amount of the flocking adhesive on the surface of the bottom non-woven fabric is 100-2Controlling the flocking voltage to be 30-50 KV, adjusting the distance between the pole plates to be 10-14 cm, and the flocking time to be 10-15 s to obtain the flocking density of 400-600 pieces/mm2The nonwoven fabric containing velvet.
In a preferred embodiment, the fiber fluff material is at least one of PE/PP, PE/PET or PP/PET, and the fiber fluff is upright and has a crimp degree of 0.
In a preferred embodiment, the flocking adhesive used in the electrostatic flocking method is a water-based acrylate adhesive with the viscosity of 15000-18000 cP.
In a preferred embodiment, the gram weight of the upper-layer non-woven fabric is 15-30 g/m2The material is at least one of PET spunlace non-woven fabric or PP spun-bonded non-woven fabric.
In a preferred embodiment, the gram weight of the bottom layer non-woven fabric is 25-35 g/m2The material is at least one of PET spunlace non-woven fabric or PP spun-bonded non-woven fabric.
According to a second aspect of the embodiments of the present invention, there is provided a moisture-permeable soft composite core, wherein the moisture-permeable soft composite core is prepared by any one of the above methods for preparing a moisture-permeable soft composite core, the moisture-permeable soft composite core sequentially includes, from bottom to top, a fleece-containing nonwoven fabric, a super absorbent resin, and an upper layer nonwoven fabric, and the fleece-containing nonwoven fabric is obtained by fixing fiber fluff on the upper surface of a bottom layer nonwoven fabric by an electrostatic flocking method.
According to a third aspect of the embodiments of the present invention, there is provided a moisture-permeable soft composite core, wherein the moisture-permeable soft composite core is prepared by any one of the above methods, and the moisture-permeable soft composite core is applied to a process for preparing a sanitary napkin.
Compared with the prior art, the moisture-permeable soft composite core and the preparation method thereof provided by the invention have the following advantages:
1) strong absorption capacity and high utilization rate of super absorbent resin. The moisture-permeable soft composite core body provided by the invention adopts fiber fluff as a medium for isolating and dredging super absorbent resin, and the PE/PP and PE/PET double-component fibers as the fluff have soft touch and good compressibility. Taking PE/PP fiber fluff as an example, the outer layer is a PE layer with a low melting point, the inner layer is a PP layer with a high melting point, under the action of oven heat, the outer layer PE is melted, and then the super absorbent resin is bonded and fixed, and the inner layer PP layer plays a role of a framework, and simultaneously has a good flow guiding function to guide liquid around the super absorbent resin, so that the liquid is absorbed and locked, the phenomenon that the local super absorbent resin is saturated to absorb to generate retardation is avoided, more swelling spaces are provided for the absorption of the super absorbent resin, the absorption capacity of the core is improved, and the using amount is reduced.
2) Good air permeability and softness. The moisture-permeable soft composite core body provided by the invention adopts PE/PP and PE/PET fiber fluff, and the soft PE component of the fiber fluff is utilized to bond and fix the super absorbent resin, which is completely different from the method for fixing the super absorbent resin by using hot melt adhesive in the traditional composite core body.
3) High absorption speed, low back-permeation and high use strength. In the invention, as the PE component of the PE/PP and PE/PET fiber fluff is in a dotted adhesion and fixation with the super absorbent resin, more exposed areas are provided for the super absorbent resin, and the super absorbent resin can quickly absorb and store liquid, thereby greatly reducing the rewet generated on the surface layer; in addition, due to the selection of the flocking method on the PET bottom layer non-woven fabric, the prepared moisture-permeable soft composite core body is endowed with better strength, the phenomena of fault and lump are avoided in the using process, and the using effect of the product is good.
In summary, according to the moisture-permeable soft composite core and the preparation method thereof provided by the invention, the composite core is prepared by the bottom non-woven fabric, the fiber fluff, the super absorbent resin and the upper non-woven fabric together, wherein the fiber fluff is fixed on the bottom non-woven fabric by an electrostatic flocking method, the super absorbent resin is uniformly dispersed among the fiber fluff, and the upper non-woven fabric and the fiber fluff are consolidated together, so that the prepared moisture-permeable soft composite core has good softness, and the super absorbent resin after water absorption has enough space to generate swelling, thereby improving the utilization rate of the super absorbent resin in the composite core, reducing the consumption of the super absorbent resin in the composite core and lowering the production cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a method flow diagram illustrating a method of making a moisture vapor permeable flexible composite core according to one exemplary embodiment.
FIG. 2 is a method flow diagram illustrating a method of making a nonwoven fabric comprising fluff in accordance with an exemplary embodiment.
FIG. 3 is a schematic product showing a moisture vapor permeable flexible composite core according to one exemplary embodiment.
Detailed Description
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart illustrating a method of manufacturing a moisture vapor permeable flexible composite core according to an exemplary embodiment, the method comprising:
step 100: and fixing fiber fluff on the upper surface of the bottom non-woven fabric by adopting an electrostatic flocking method to obtain the fluff-containing non-woven fabric.
Step 200: and (3) sending the non-woven fabric containing the velvet into an oven for pre-drying and reinforcing, wherein the pre-drying temperature adopted in the pre-drying and reinforcing process is 80-90 ℃, and the pre-drying time is 3-5 min.
Step 300: spraying super absorbent resin on the upper surface of the pre-dried and reinforced fleece-containing non-woven fabric, wherein the super absorbent resin is 20-40 meshes, and the spraying amount is 10-25g/m2。
Step 400: compounding the fleece-containing non-woven fabric sprayed with the super absorbent resin with the upper non-woven fabric to obtain a composite core semi-finished product, then sending the composite core semi-finished product to an oven for drying and compounding, and cooling and winding to obtain a moisture-permeable soft composite core finished product, wherein the pre-drying temperature adopted in the drying and compounding process is 110-2The thickness is 2.25-3.12 mm.
In the drying and compounding process, the outer layer components of the fiber fluff are softened and melted to bond the super absorbent resin dispersed among the fiber fluff, and the upper layer non-woven fabric is fixed.
In a preferred embodiment, the method for preparing the nonwoven fabric containing flock is as shown in fig. 2, and in fig. 2, the step of fixing the fiber flock on the upper surface of the base nonwoven fabric by electrostatic flocking method to obtain the nonwoven fabric containing flock comprises:
step 110: and putting the fiber fluff with the length of 1.5-3mm and the linear density of 1.5-3D into the finishing liquid for soaking for 25-40 min.
The temperature of the finishing liquid is 45-55 ℃, the bath ratio is 1: 30-40, wherein the finishing liquid comprises the following components in percentage by weight: 0.5-1wt% of penetrating agent JFC and 2-5wt% of K2SO42-4wt% of non-ionic antistatic agent, 3-6 wt% of silica sol, 2-4wt% of MgCl21-3 wt% of softening agent, 0.5-2.5 wt% of glacial acetic acid and the balance of water; wherein, the concentration of the silicon dioxide in the silica sol is 10-15 wt%, and the average particle size of the silicon dioxide is 10-20 μm.
Step 120: drying the soaked fiber fluff to enable the water content of the fiber fluff to be 5-8 wt%, wherein the specific resistance of the fiber fluff after drying is 8' 107-9´108Ω·cm。
Step 130: after coating flocking adhesive on the bottom non-woven fabric, sending the non-woven fabric to a high-voltage electrostatic field, wherein the coating amount of the flocking adhesive on the surface of the bottom non-woven fabric is 100-2Controlling the flocking voltage to be 30-50 KV, adjusting the distance between the pole plates to be 10-14 cm, and the flocking time to be 10-15 s to obtain the flocking density of 400-600 pieces/mm2The nonwoven fabric containing velvet.
In a preferred embodiment, the fiber fluff material is at least one of PE/PP, PE/PET or PP/PET, and the fiber fluff is upright and has a crimp degree of 0.
In a preferred embodiment, the flocking adhesive used in the electrostatic flocking method is a water-based acrylate adhesive with the viscosity of 15000-18000 cP.
In a preferred embodiment, the gram weight of the upper-layer non-woven fabric is 15-30 g/m2The material is at least one of PET spunlace non-woven fabric or PP spun-bonded non-woven fabric.
In a preferred embodiment, the gram weight of the bottom layer non-woven fabric is 25-35 g/m2The material is at least one of PET spunlace non-woven fabric or PP spun-bonded non-woven fabric.
Further, the present invention also shows a schematic product of the moisture-permeable soft composite core, as shown in fig. 3, in the moisture-permeable soft composite core shown in fig. 3, 1 is an upper layer nonwoven fabric, 2 is a bottom layer nonwoven fabric, 3 is fiber fluff, and 4 is a super absorbent resin.
In order to better understand the moisture vapor permeable soft type composite core body and the preparation method thereof provided by the present invention, the present invention further shows practical production examples 1, 2, 3 of the moisture vapor permeable soft type composite core body for further explanation.
Example 1
(1) Putting fiber fluff with the length of 1.mm and the linear density of 1.5D into finishing liquid, and soaking for 25min, wherein the temperature of the finishing liquid is 45 ℃, and the bath ratio is 1: 30, the finishing liquid comprises the following components in percentage by weight: 0.5wt% of penetrating agent JFC, 2wt% of K2SO42% by weight of a nonionic antistatic agent, 3% by weight of silica sol, 2% by weight of MgCl21wt% of softening agent, 0.5wt% of glacial acetic acid and the balance of water; wherein the silica sol has a silica concentration of 10 wt% and an average silica particle diameter of 10 to 13 μm.
The fiber fluff is made of PE/PP (polyethylene/polypropylene), is upright and has a crimpness of 0.
(2) And drying the soaked fiber fluff to enable the water content of the fiber fluff to be 5wt%, wherein the specific resistance of the fiber fluff after drying treatment is 8' 107 omega cm.
(3) Coating flocking adhesive on the bottom non-woven fabric, and then sending the non-woven fabric to a high-voltage electrostatic field, wherein the coating amount of the flocking adhesive on the surface of the bottom non-woven fabric is 100g/m2Controlling the flocking voltage to be 30KV, adjusting the distance between the polar plates to be 10cm, and the flocking time to be 10 s to obtain the flocking with the density of 600 roots/mm2The flocking adhesive adopted by the electrostatic flocking method is water-based acrylate adhesive, and the viscosity is 15000 cP.
(4) And (3) sending the non-woven fabric containing the velvet into an oven for pre-drying and reinforcing, wherein the pre-drying temperature adopted in the pre-drying and reinforcing process is 80 ℃, and the pre-drying time is 3 min.
(5) Spraying super absorbent resin on the upper surface of the pre-dried and reinforced fleece-containing non-woven fabric, wherein the super absorbent resin is 20 meshes and the spraying amount is 10g/m2。
(6) Compounding the fleece-containing non-woven fabric sprayed with the super absorbent resin with the upper non-woven fabric to obtain a semi-finished composite core, then sending the semi-finished composite core to an oven for drying and compounding, and cooling and winding to obtain a moisture-permeable soft composite core finished product, wherein the pre-drying temperature adopted in the drying and compounding process is 110 ℃, the pre-drying time is 2min, the baking temperature is 120 ℃, the baking time is 3min, and the gram weight of the moisture-permeable soft composite core is 135g/m2And the thickness is 2.25 mm.
The gram weight of the upper layer non-woven fabric is 15 g/m2The gram weight of the bottom layer non-woven fabric is 25g/m2And the upper layer non-woven fabric and the bottom layer non-woven fabric are both PP spunbonded non-woven fabrics.
Example 2
(1) Putting the fiber fluff with the length of 2mm and the linear density of 2.5D into finishing liquid, and soaking for 30min, wherein the temperature of the finishing liquid is 50 ℃, and the bath ratio is 1: 35, the finishing liquid comprises the following components in percentage by weight: 0.8wt% of penetrant JFC, 3.5wt% of K2SO43% by weight of a nonionic antistatic agent, 4.5% by weight of silica sol, 3% by weight of MgCl22.5 wt% of softening agent, 1.8wt% of glacial acetic acid and the balance of water; wherein the silica sol has a silica concentration of 13.6 wt% and an average silica particle diameter of 13 to 16 μm.
The fiber fluff is made of PE/PET, is upright and has a crimpness of 0.
(2) And drying the soaked fiber fluff to enable the water content of the fiber fluff to be 7.1wt%, wherein the specific resistance of the fiber fluff after drying is 8.5' 108 Ω & cm.
(3) Coating flocking adhesive on the bottom non-woven fabric, and sending the non-woven fabric to a high-voltage electrostatic field, wherein the coating amount of the flocking adhesive on the surface of the bottom non-woven fabric is 110g/m2Controlling the flocking voltage to be 40 KV, adjusting the distance between the polar plates to be 12 cm, and the flocking time to be 12.5 s to obtain the flocking with the density of 500 roots/mm2The flocking adhesive adopted by the electrostatic flocking method is a water-based acrylate adhesive, and the viscosity is 16800 cP.
(4) And (3) sending the non-woven fabric containing the velvet into an oven for pre-drying and reinforcing, wherein the pre-drying temperature adopted in the pre-drying and reinforcing process is 85 ℃, and the pre-drying time is 4 min.
(5) Spraying super absorbent resin on the upper surface of the pre-dried and reinforced fleece-containing non-woven fabric, wherein the super absorbent resin is 28 meshes and the spraying amount is 18g/m2。
(6) Compounding the fleece-containing non-woven fabric sprayed with the super absorbent resin with the upper non-woven fabric to obtain a semi-finished composite core, then sending the semi-finished composite core to an oven for drying and compounding, and cooling and winding to obtain a moisture-permeable soft composite core finished product, wherein the pre-drying temperature adopted in the drying and compounding process is 115 ℃, the pre-drying time is 3min, the curing temperature is 130 ℃, the curing time is 4.5 min, and the gram weight of the moisture-permeable soft composite core is 180g/m2The thickness is 2.58 mm.
The gram weights of the upper layer non-woven fabric and the bottom layer non-woven fabric are both 20g/m2And the upper layer non-woven fabric and the bottom layer non-woven fabric are both PP spunbonded non-woven fabrics.
Example 3
(1) Putting the fiber fluff with the length of 3mm and the linear density of 3D into finishing liquid, and soaking for 40min, wherein the temperature of the finishing liquid is 55 ℃, and the bath ratio is 1: 40, the finishing liquid comprises the following components in percentage by weight: 1wt% of penetrant JFC, 5wt% of K2SO44% by weight of a nonionic antistatic agent, 6% by weight of silica sol, 4% by weight of MgCl23wt% of softening agent, 2.5 wt% of glacial acetic acid and the balance of water; wherein the silica sol has a silica concentration of 15 wt% and an average silica particle diameter of 16 to 20 μm.
The fiber fluff is made of PP/PET, is upright and has a crimpness of 0.
(2) Drying the soaked fiber fluff to enable the water content of the fiber fluff to be 8wt%, wherein the specific resistance of the fiber fluff after drying treatment is 9' 108Ω·cm。
(3) Coating flocking adhesive on the bottom non-woven fabric, and then sending the non-woven fabric to a high-voltage electrostatic field, wherein the coating amount of the flocking adhesive on the surface of the bottom non-woven fabric is 120g/m2The flocking voltage is controlled to be 50 KV,adjusting the distance between the electrode plates to be 14 cm, the flocking time to be 15 s, and obtaining the flocking density of 400 roots/mm2The flocking adhesive adopted by the electrostatic flocking method is a water-based acrylate adhesive, and the viscosity is 18000 cP.
(4) And (3) sending the non-woven fabric containing the velvet into an oven for pre-drying and reinforcing, wherein the pre-drying temperature adopted in the pre-drying and reinforcing process is 90 ℃, and the pre-drying time is 5 min.
(5) Spraying super absorbent resin on the upper surface of the pre-dried and reinforced fleece-containing non-woven fabric, wherein the super absorbent resin is 40 meshes, and the spraying amount is 25g/m2。
(6) Compounding the fleece-containing non-woven fabric sprayed with the super absorbent resin with the upper non-woven fabric to obtain a semi-finished composite core, then sending the semi-finished composite core to an oven for drying and compounding, and cooling and winding to obtain a moisture-permeable soft composite core finished product, wherein the pre-drying temperature adopted in the drying and compounding process is 120 ℃, the pre-drying time is 4min, the baking temperature is 140 ℃, the baking time is 6 min, and the gram weight of the moisture-permeable soft composite core is 220g/m2And the thickness is 3.12 mm.
The gram weight of the upper layer non-woven fabric is 30 g/m2The gram weight of the bottom layer non-woven fabric is 35g/m2And the upper non-woven fabric and the bottom non-woven fabric are both PET spunlace non-woven fabrics.
Further, the present invention compares the performance of the moisture-permeable soft composite core prepared in the above examples 1 to 3 with that of a commercially available sanitary napkin, and tests were performed on each moisture-permeable soft composite core with respect to diffusion length, rewet amount, water absorption capacity, softness, thickness, strength, etc. to obtain the test results shown in table 1, wherein the test methods used in the performance tests were as follows:
1) thickness of
The thickness of the model YG (B) 141D digital fabric thickness gauge was used, and the test method was carried out according to GB/T3820-1997 standard.
2) Softness
The bending tester FB2 in the KES-F fabric stylizer system is used for testing, the bending rigidity is used as an index for measuring the flexibility of the base cloth, and the base cloth is more flexible when the bending rigidity is smaller. The test specimen was 200 mm. times.200 mm in size.
3) Diffusion length and rewet volume
Measuring a 0.9% physiological saline test solution by using a measuring cylinder, pouring the physiological saline test solution into a funnel, enabling a lower opening of the funnel to face an operator, quickly opening a throttle of the funnel to the maximum to enable the liquid to freely flow to the surface of a sample, starting timing, injecting the same amount of test solution again when 5min later, measuring the diffusion length of the liquid in a core body by using a steel ruler when 9min later, quickly placing phi l00mm filter paper with known weight M1 on the surface of the sample when 10min later, simultaneously pressing 1.2kg of a pressing block on the filter paper, removing the pressing block after 1min later, and weighing the filter paper M2 on the surface of the sample.
Diffusion length: after two douches, the average value of the maximum value and the minimum value of the liquid length is obtained.
M (amount of rewet) = M2 (mass after filter paper imbibition) -M1 (mass before filter paper imbibition).
4) Water absorption rate
Standard GB/T8939-2108 sanitary napkins (pantiliners) were performed at the time of testing.
5) Strength of
The YG026H-50 electronic fabric strength machine is adopted, and the test method is executed according to GB/T453-2002 standard.
Figure DEST_PATH_IMAGE001
Table 1: test results of composite core Performance
As can be seen from table 1, the moisture-permeable soft composite core prepared in examples 1 to 3 is significantly superior to the composite core for sanitary napkins on the market in terms of water absorption rate, diffusion length, rewet property, and strength, and in addition, the moisture-permeable soft composite core prepared in the present invention has a relatively good value in bending rigidity, i.e., softness, and is more flexible and comfortable in actual use. Obviously, the moisture-permeable soft composite core prepared by the invention has good diffusivity and absorptivity and low rewet capacity, and because the fibers are used as a medium for dredging the super absorbent resin, the composite core has good flexibility and more pores among the fibers, provides more pores for the super absorbent resin to swell, has higher utilization rate for the super absorbent resin, and is an ideal new material for the industry of disposable sanitary products.
Compared with the prior art, the moisture-permeable soft composite core and the preparation method thereof provided by the invention have the following advantages:
1) strong absorption capacity and high utilization rate of super absorbent resin. The moisture-permeable soft composite core body provided by the invention adopts fiber fluff as a medium for isolating and dredging super absorbent resin, and the PE/PP and PE/PET double-component fibers as the fluff have soft touch and good compressibility. Taking PE/PP fiber fluff as an example, the outer layer is a PE layer with a low melting point, the inner layer is a PP layer with a high melting point, under the action of oven heat, the outer layer PE is melted, and then the super absorbent resin is bonded and fixed, and the inner layer PP layer plays a role of a framework, and simultaneously has a good flow guiding function to guide liquid around the super absorbent resin, so that the liquid is absorbed and locked, the phenomenon that the local super absorbent resin is saturated to absorb to generate retardation is avoided, more swelling spaces are provided for the absorption of the super absorbent resin, the absorption capacity of the core is improved, and the using amount is reduced.
2) Good air permeability and softness. The moisture-permeable soft composite core body provided by the invention adopts PE/PP and PE/PET fiber fluff, and the soft PE component of the fiber fluff is utilized to bond and fix the super absorbent resin, which is completely different from the method for fixing the super absorbent resin by using hot melt adhesive in the traditional composite core body.
3) High absorption speed, low back-permeation and high use strength. In the invention, as the PE component of the PE/PP and PE/PET fiber fluff is in a dotted adhesion and fixation with the super absorbent resin, more exposed areas are provided for the super absorbent resin, and the super absorbent resin can quickly absorb and store liquid, thereby greatly reducing the rewet generated on the surface layer; in addition, due to the fact that the flocking method is selected on the PET bottom layer non-woven fabric, the prepared composite core body is endowed with better strength, the phenomena of faults and lump formation cannot occur in the using process, and the using effect of the product is good. In summary, according to the moisture-permeable soft composite core and the preparation method thereof provided by the invention, the composite core is prepared by the bottom non-woven fabric, the fiber fluff, the super absorbent resin and the upper non-woven fabric together, wherein the fiber fluff is fixed on the bottom non-woven fabric by an electrostatic flocking method, the super absorbent resin is uniformly dispersed among the fiber fluff, and the upper non-woven fabric and the fiber fluff are consolidated together, so that the prepared moisture-permeable soft composite core has good softness, and the super absorbent resin after water absorption has enough space to generate swelling, thereby improving the utilization rate of the super absorbent resin in the composite core, reducing the consumption of the super absorbent resin in the composite core and lowering the production cost.
While the invention has been described in detail in the foregoing by way of general description, and specific embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof.

Claims (8)

1. A preparation method of a moisture-permeable soft composite core body is characterized by comprising the following steps:
fixing fiber fluff on the upper surface of the bottom non-woven fabric by adopting an electrostatic flocking method to obtain a fluff-containing non-woven fabric;
sending the non-woven fabric containing the velvet into an oven for pre-drying and reinforcing, wherein the pre-drying temperature adopted in the pre-drying and reinforcing process is 80-90 ℃, and the pre-drying time is 3-5 min;
will absorb high waterSpraying resin on the upper surface of the pre-dried and reinforced fleece-containing non-woven fabric, wherein the super absorbent resin is 20-40 meshes, and the spraying amount is 10-25g/m2；
Compounding the fleece-containing non-woven fabric sprayed with the super absorbent resin with the upper non-woven fabric to obtain a composite core semi-finished product, then sending the composite core semi-finished product to an oven for drying and compounding, and cooling and winding to obtain a moisture-permeable soft composite core finished product, wherein the pre-drying temperature adopted in the drying and compounding process is 110-2The thickness is 2.25-3.12 mm.
2. The method for preparing a nonwoven fabric according to claim 1, wherein the step of fixing the fiber fluff to the upper surface of the base nonwoven fabric by electrostatic flocking to obtain a nonwoven fabric containing fluff comprises:
putting fiber fluff with the length of 1.5-3mm and the linear density of 1.5-3D into finishing liquid, soaking for 25-40min, wherein the temperature of the finishing liquid is 45-55 ℃, and the bath ratio is 1: 30-40, wherein the finishing liquid comprises the following components in percentage by weight: 0.5-1wt% of penetrating agent JFC and 2-5wt% of K2SO42-4wt% of non-ionic antistatic agent, 3-6 wt% of silica sol, 2-4wt% of MgCl21-3 wt% of softening agent, 0.5-2.5 wt% of glacial acetic acid and the balance of water; wherein, the concentration of the silicon dioxide in the silica sol is 10-15 wt%, and the average particle size of the silicon dioxide is 10-20 μm;
drying the soaked fiber fluff to enable the water content of the fiber fluff to be 5-8 wt%, wherein the specific resistance of the fiber fluff after drying is 8' 107-9´108Ω·cm；
After coating flocking adhesive on the bottom non-woven fabric, sending the non-woven fabric to a high-voltage electrostatic field, wherein the coating amount of the flocking adhesive on the surface of the bottom non-woven fabric is 100-2Controlling the flocking voltage to be 30-50 KV, adjusting the distance between the pole plates to be 10-14 cm, and the flocking time to be 10-15 s to obtain the flocking density of 400-600 pieces/mm2The nonwoven fabric containing velvet.
3. The method as claimed in claim 1, wherein the fiber fluff material is at least one of PE/PP, PE/PET or PP/PET, and the fiber fluff is upright and has a crimp degree of 0.
4. The preparation method according to claim 1, characterized in that the flocking glue used in the electrostatic flocking method is a water-based acrylate adhesive with a viscosity of 15000-18000 cP.
5. The method according to claim 1, wherein the grammage of the upper layer nonwoven fabric is 15-30 g/m2The material is at least one of PET spunlace non-woven fabric or PP spun-bonded non-woven fabric.
6. The method as claimed in claim 1, wherein the basis weight of the base nonwoven fabric is 25-35 g/m2The material is at least one of PET spunlace non-woven fabric or PP spun-bonded non-woven fabric.
7. A moisture-permeable soft composite core, which is prepared by the preparation method of the moisture-permeable soft composite core according to any one of claims 1 to 6, wherein the moisture-permeable soft composite core sequentially comprises a velvet-containing non-woven fabric, a super absorbent resin and an upper non-woven fabric from bottom to top, and the velvet-containing non-woven fabric is obtained by fixing fiber velvet on the upper surface of a bottom non-woven fabric through an electrostatic flocking method.
8. The application of the moisture-permeable soft composite core body is characterized in that the moisture-permeable soft composite core body is prepared by the preparation method of the moisture-permeable soft composite core body according to any one of claims 1 to 6, and the moisture-permeable soft composite core body is applied to a preparation process of a sanitary towel.
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