Preparation method of low reverse osmosis baby diaper

Abstract

The present application relates to the technical field of disposable sanitary products, and particularly relates to a preparation method of a low reverse osmosis baby diaper, and a preparation method of an absorbent body comprising the following steps: a, taking two hydrophilic non-woven fabrics as upper and lower surface layers of a core body and continuously conveying them respectively; b, applying glue on the upper surface of the lower surface layer and continuously conveying; c, applying liquid absorbing material on the upper surface of the lower surface layer, so that the liquid absorbing material is bonded with the glued lower surface layer, the liquid absorbing material is composed of fluff pulp and SAP, and after being laid, a single fluff pulp layer and SAP layer are formed; d, folding the lower surface layer on the two sides of the lower surface layer to which the liquid absorbing material is applied in step c inward, so that the two sides of the continuously conveyed lower surface layer form multiple folding parts, the inner side surface of the folding part is bonded with the fluff pulp layer, and the lower surface layer between the two folding parts is distributed with the fluff pulp layer and the SAP layer. The present application solves the problem of the existing sanitary product that the anti-reverse osmosis product has a large thickness and poor comfort.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disposable hygiene products, in particular to a preparation method of a low reverse osmosis baby diaper. BACKGROUND

[0002] The reverse osmosis of hygiene products refers to the process of liquid reverse osmosis after the product such as a diaper is compressed under a certain pressure after absorbing liquid. This osmosis refers to the seepage from the edge or surface layer of the product. The reasons for this situation are usually caused by insufficient liquid absorption capacity, improper size or wearing method, unreasonable design, etc.

[0003] At present, the market has technical solutions such as Chinese patent application CN 112245116 A to solve this shortcoming. Specifically, a fast-absorbing low reverse osmosis rate diaper is shown, which includes a surface layer, a flow guide layer, an absorption core, a coating layer, a urine display adhesive layer, and a bottom film from inside to outside. The absorption core includes dust-free paper, a first absorption core, fluffy cloth, a second absorption core, and hot air cloth from inside to outside. The content of high molecular absorption resin in the first absorption core is 25% to 35%, and the content of high molecular absorption resin in the second absorption core is 65% to 75%. The main feature is a composite laminated structure to improve water retention and liquid absorption effect and reduce reverse osmosis.

[0004] However, the composite core of this laminated structure inevitably increases the amount of liquid absorption material and the thickness of the core, which not only increases the material cost but also affects the comfort of consumers due to the increase in thickness. SUMMARY

[0005] Therefore, the present application provides a preparation method of a low reverse osmosis baby diaper to solve the problem of thick and poor comfort of existing reverse osmosis prevention products.

[0006] To achieve the above-mentioned purpose, the present application is realized by the following technical solutions:

[0007] A preparation method of a low reverse osmosis baby diaper, including preparing a hydrophilic surface layer, preparing an absorption body, preparing a water-repellent bottom layer, and cutting the hydrophilic surface layer, the absorption body, and the water-repellent bottom layer after compounding. The preparation of the absorption body includes the following steps:

[0008] a. Take two hydrophilic non-woven fabrics as the upper and lower surfaces of the core and continuously transport them respectively. Define the width direction of the upper and lower surfaces as the transverse direction.

[0009] b. Apply glue to the upper surface of the lower surface and continue to transport.

[0010] c. applying liquid-absorbing material on the upper surface of the lower surface layer, so that the liquid-absorbing material is bonded to the sized lower surface layer, wherein the liquid-absorbing material is composed of fluff pulp and SAP, and forms a separate fluff pulp layer and SAP layer after being laid out;

[0011] d. folding the lower surface layer on both sides inward to form a plurality of folded portions on both sides of the continuously conveyed lower surface layer, wherein the inner surface of the folded portions is bonded with the fluff pulp layer, and the fluff pulp layer and the SAP layer are distributed on the lower surface layer between the folded portions on both sides;

[0012] e. sizing the lower surface of the upper surface layer and continuously conveying the upper surface layer to be combined with the lower surface layer;

[0013] f. cutting the combined upper surface layer and lower surface layer to obtain individual absorbent bodies.

[0014] Preferably, in step e, the sizing position of the upper surface layer is located on both sides of the upper surface layer, and the combined position of the upper surface layer and the lower surface layer is located on the upper surface of the folded portions.

[0015] Preferably, in step e, the sizing position of the upper surface layer is located on both sides of the upper surface layer, and the combined position of the upper surface layer and the lower surface layer is located on the surface of the lower surface layer at the lower end of the folded portions.

[0016] Preferably, in step d, the fluff pulp layer on the lower surface layer between the folded portions on both sides covers the upper surface of the SAP layer.

[0017] Preferably, in step d, the fluff pulp layer and the SAP layer are alternately distributed on the lower surface layer between the folded portions on both sides, and the area of the fluff pulp layer is greater than the area of the SAP layer.

[0018] Preferably, the hydrophilic surface layer is provided with symmetrically distributed leak-proof barriers, and the folded portions are located on the inner side of the leak-proof barriers.

[0019] Preferably, the hydrophilic surface layer is provided with symmetrically distributed leak-proof barriers, and the leak-proof barriers are connected to the water-repellent bottom layer.

[0020] Preferably, a flow guide layer is arranged between the hydrophilic surface layer and the upper surface layer.

[0021] By adopting the foregoing technical solutions, the application has the following beneficial effects:

[0022] The technical scheme is characterized in that: according to the disadvantage that the paper diaper product is easy to be pressed and appear reverse seepage, a folding part structure is designed on both sides of the absorbent body, the folding part can form corresponding protrusions on both sides of the absorbent body in the transverse direction, the thickness is increased, a wrapping structure for the liquid absorbing material in the absorbent body is formed, a wall structure for blocking and absorbing liquid in the thickness direction is formed after liquid enters, and then side leakage when being pressed is avoided from the structure of the absorbent body; and the protruding folding part structure can also form support for the hydrophilic surface layer, so that the inside of the absorbent body is in a hollow state, and then direct pressure of the baby on the middle position of the absorbent body is avoided to a certain extent, and then the reverse seepage effect is reduced; when the liquid absorbing material is arranged, the fluff pulp and the SAP are arranged in a layered and positionally distributed form, the fluff pulp is arranged at the folding part position, so that the purpose of quickly absorbing and guiding the liquid to the center of the absorbent body is achieved; and the part between the two folding parts is arranged by covering the fluff pulp layer with the SAP layer as required, so that the liquid is quickly absorbed and has sufficient water locking capacity; the hollow structure also reduces the overall thickness of the absorbent body, and avoids affecting the comfort due to the excessive thickness. BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION OF THE INVENTION BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the layering structure of the paper diaper in the embodiment one of the application.

[0024] Figure 2 It is a schematic diagram of the overall process structure of the absorbent body preparation in the embodiment one of the application.

[0025] Figure 3 It is a schematic diagram of the structure of the guiding folding assembly in the embodiment one of the application.

[0026] Figure 4 It is a schematic diagram of the position distribution structure of the forming unit in the embodiment one of the application.

[0027] Figure 5 It is a schematic diagram of the layering structure of the paper diaper in the embodiment two of the application.

[0028] The drawings show that: 1, the hydrophilic surface layer; 11, the leakage prevention separation edge; 2, the absorbent body; 21, the fluff pulp layer; 22, the SAP layer; 23, the folding part; 3, the water-repellent bottom layer; 4, the flow guide layer; m, the upper surface layer; n, the lower surface layer; 100, the upper conveying unit; 200, the lower conveying unit; 300, the blanking unit; 300a, the SAP adding device; 300b, the cotton forming device; 400, the gluing unit; 500, the hot pressing welding unit; 600, the forming unit; 601, the first inclined guide plate; 602, the second inclined guide plate; 603, the third inclined guide plate; 604, the outer side longitudinal plate; 605, the bottom plate; 606, the waist-shaped hole; 700, the adsorption groove. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following will be described in detail in combination with specific embodiments, so that the application of technical means to solve technical problems and achieve technical effects can be fully understood and implemented.

[0030] Embodiment one

[0031] Reference Figures 1 to 4 A preparation method of a low reverse osmosis baby diaper, comprising preparing a hydrophilic surface layer 1, preparing an absorbent body 2, preparing a water-repellent bottom layer 3, and cutting after compounding the hydrophilic surface layer 1 with the absorbent body 2 and the water-repellent bottom layer 3, and the preparation of the absorbent body 2 comprises the following steps:

[0032] a. Take two hydrophilic non-woven fabrics as the upper surface layer m and the lower surface layer n of the core body and continuously convey them respectively, and define the width direction of the upper surface layer m and the lower surface layer n as the transverse direction;

[0033] b. Glue the upper surface of the lower surface layer n and continue to convey;

[0034] c. Apply liquid-absorbing material to the upper surface of the lower surface layer n, so that the liquid-absorbing material is bonded to the glued lower surface layer n, and the liquid-absorbing material is composed of fluff pulp and SAP, and after being arranged, a separate fluff pulp layer 21 and SAP layer 22 are formed;

[0035] d. Fold inward the transverse two sides of the lower surface layer n to which the liquid-absorbing material is applied in step c, so that the continuously conveyed lower surface layer n forms a plurality of folding portions 23 on both sides, and the inner side surface of the folding portion 23 is bonded with the fluff pulp layer 21, and the lower surface layer n between the two folding portions 23 is distributed with the fluff pulp layer 21 and the SAP layer 22; in structure, the fluff pulp layer 21 on the lower surface layer n between the two folding portions 23 covers the upper surface of the SAP layer 22; the fluff pulp layer 21 is connected integrally with the fluff pulp on the folding portion 23, can rapidly spread after receiving urine from the surface, and is blocked between the two folding portions 23, and then penetrates into contact with the SAP layer 22, is absorbed and locked, to achieve the functions of rapid absorption, spreading and water locking;

[0036] e. Glue the lower surface of the upper surface layer m and continue to convey, and make it composite with the lower surface layer n; specifically, the gluing position of the upper surface layer m is located on the transverse two sides thereof, and the composite position of the upper surface layer m and the lower surface layer n is located on the upper surface of the folding portion 23, that is, after the upper surface layer m is composite bonded, it has no effect on the deformation of the folding portion 23, and after the folding portion 23 absorbs liquid, it will deform with the expansion of the SAP material, and then the height of the folding portion 23 will be further increased, and the internal hollow structure will also be correspondingly increased, so as to further separate the hydrophilic surface layer 1 at the upper end from the center position of the absorbent body 2, so as to reduce the reverse osmosis under pressure;

[0037] f. After compounding, cutting is performed to obtain a single absorbent body 2;

[0038] And in the forming of the absorbent body 2, the following paper diaper core body forming device is used for production, which includes a rack, the rack is provided with an upper conveying unit 100 and a lower conveying unit 200 for conveying the upper layer m and the lower layer n in a flow line;

[0039] A dispensing unit 300 is used for applying liquid absorbing material on the lower layer n conveyed by the lower conveying unit 200; the dispensing unit 300 is arranged to include SAP adding device 300a and cotton forming device 300b arranged in sequence, and the two materials are separated in the form of separate dispensing, so that the wood pulp and paper pulp with good water absorption and fast diffusion and the SAP material for water locking are arranged separately, and the spatial distribution of the two materials in the layer position, transverse position and other positions can be adjusted according to the requirements, so as to adapt to the production of products with different properties;

[0040] A sizing unit 400 is used for sizing the surfaces of the upper layer m and the lower layer n; the sizing unit 400 is spiral sizing or spraying, which is used in the form of spraying for convenient arrangement;

[0041] A hot press welding unit 500 is used for compounding the upper layer m and the lower layer n into an integrated body; a forming unit 600 is arranged on the rack at the lower conveying unit 200 at the rear end of the dispensing unit 300 for inwardly folding the lower layer n on the transverse two sides; the forming unit 600 includes guide folding assemblies arranged on the transverse two sides of the lower layer n, each guide folding assembly includes a bottom plate 605 arranged in parallel with the lower layer n, an outer longitudinal plate 604 arranged perpendicular to the bottom plate 605, a first inclined guide plate 601 fixedly connected to the upper end of the outer longitudinal plate 604, a second inclined guide plate 602 fixedly connected to the end of the first inclined guide plate 601, and a third inclined guide plate 603 fixedly connected to the end of the second inclined guide plate 602; the opening degree between the second inclined guide plate 602 and the third inclined guide plate 603 gradually decreases from the input end of the lower layer n.

[0042] Unlike the traditional sanitary product production folding mechanism, the guide folding assembly acts on the sheet-shaped flow line material with liquid absorbing material, so the length of the guide folding assembly should not be too long to avoid large area deviation of the liquid absorbing material after being originally glued to the lower layer n due to too long length, so the length needs to be less than 35 cm; and since the flow line is folded and formed with liquid absorbing material, an adsorption groove 700 is arranged between the two guide folding assemblies at the forming position, and the width of the adsorption groove 700 is less than the width of the lower layer n; in this way, a certain extendable end part can be formed in the non-adsorbed area of the adsorption groove 700, which is beneficial to the action of the guide folding assembly, and the traditional guide roller structure covering the whole transverse range has greater limitations on the material of the lower layer n, and the length of the forming flow line needs to be lengthened, which is also more prone to material damage during inward folding.

[0043] Specifically, the upper conveying unit 100 and the lower conveying unit 200 each include a pay-off roller, a material receiving unit, a material storage unit, and a deviation rectifying mechanism. The above-mentioned mechanisms are all conventional devices in the field and can be commercially available, and thus are not described here in detail.

[0044] The SAP refers to the commonly used liquid absorbing material high molecular water absorbing resin in the sanitary industry. The liquid absorbing sheet is the product after the pulp and wood pulp are crushed by a crusher, or is also called fluff pulp. The specific structure of the forming die wheel mechanism is shown in the prior application CN 215459345 U of the associated enterprise of the applicant, which will not be described in detail. When the blanking unit 300 is blanking, the width of the blanking should be shortened, and the amount of liquid absorbing material at the action position of the guiding and folding assembly, that is, the transverse two side edges of the lower layer n, should be reduced, so as to facilitate the folding and avoid or reduce the liquid absorbing material from falling out of the lower layer n during folding. The forming device adopts a guiding and folding assembly with multiple layers of guides. In production, when the guiding and folding assembly acts on both sides of the lower layer n, the first inclined guide plate 601 and the second inclined guide plate 602 form the required folding, and then the third inclined guide plate 603 and the second inclined guide plate 602 gradually reduce the opening, so that the height of the folding position on both sides of the core gradually decreases, until the folding positions are attached to each other, and enter the composite process between the lower layer n and the upper layer m. This process can fold the transverse two sides of the lower layer n with liquid absorbing material as needed, form the required transverse cross section, and form a concave groove structure in the middle of the formed diaper core. The connection on both sides is affected by factors such as the width of the upper layer m, whether the lower package is folded, the glue application structure, the composition of the internal core material, etc. The concave groove structure can form the expansion space of the core material, and the folding position on both sides forms a liquid blocking and absorbing wall in the thickness direction after the liquid enters, ensuring the absorption of the liquid. This multi-layer structure forms a longitudinal space on both sides of the transverse direction on the basis of the traditional multi-layer core, which can fill different materials and apply different material proportions inside to achieve different functions, forming a structure different from the traditional multi-layer composite material, and has good applicability and can meet the current production needs of multi-functional composite cores. In terms of structure, the first inclined guide plate 601, the second inclined guide plate 602 and the outer longitudinal plate 604 are hingedly arranged, the waist-shaped hole 606 is arranged in the middle of the first inclined guide plate 601, and an adjusting rod for adjusting the angle of the first inclined guide plate 601 and supporting the second inclined guide plate 602 is arranged in the waist-shaped hole 606. In this structure, the lower end of the adjusting rod is screwed on the bottom plate 605, and the adjusting rod can be rotated to change the height of the contact point of the second inclined guide plate 602, and then adjust the opening of the second inclined guide plate 602 and the first inclined guide plate 601, so as to adjust the guiding and folding requirements suitable for different products and models, improve the practicability of this structure, and facilitate the rotation of the first inclined guide plate 601 through the retreat structure of the waist-shaped hole 606. The hinge structure can be fixed by using a hinge with appropriate size.

[0045] The product is provided with leakproof partitions 11 symmetrically arranged on the hydrophilic surface layer 1, and the folding portions 23 are located inside the leakproof partitions 11. The leakproof partitions 11 are made of water-repellent material and are provided with elastic bands to prevent side leakage. The structure is arranged outside the folding portions 23 to further prevent the lateral flow of urine and ensure sufficient blocking when the amount of urine is large, thereby avoiding side leakage and ensuring absorption. In order to further improve the diffusion effect, the hydrophilic surface layer 1 is provided with a flow guide layer 4 between the upper surface layer m. This structure is also conducive to avoiding side leakage.

[0046] The technical scheme is designed according to the disadvantage that the paper diaper product is easily pressed and appears reverse seepage. The folding portions 23 are designed on both sides of the absorbent body 2. The folding portions 23 can form corresponding protrusions on both sides of the absorbent body 2 in the transverse direction, increase the thickness, form a wrapping structure for the liquid absorbing material in the absorbent body 2, form a wall structure for blocking and absorbing liquid in the thickness direction after the liquid enters, and further avoid side leakage when pressed from the structure of the absorbent body 2. In addition, the protruding folding portions 23 can also support the hydrophilic surface layer 1, so that the inside of the absorbent body 2 is in a hollow state, thereby avoiding the direct pressure of the baby on the middle part of the absorbent body 2 to a certain extent, and reducing the reverse seepage effect. When the liquid absorbing material is arranged, the fluff pulp and SAP are layered and arranged in different positions. The fluff pulp is arranged at the folding portions 23 to achieve the purpose of rapid absorption and flow guide to the center of the absorbent body 2. The fluff pulp layer 21 and the SAP layer 22 are arranged as needed between the two folding portions 23, thereby ensuring rapid liquid absorption and sufficient water locking capacity. The hollow structure also reduces the overall thickness of the absorbent body 2, avoids excessive thickness, and affects comfort.

[0047] Embodiment two

[0048] Reference Figure 5Compared with the first embodiment, in the step e, the gluing position of the upper surface layer m is located on both sides of the upper surface layer m, and the upper surface layer m is folded inwardly downwardly to be combined with the lower surface layer n at the surface of the lower surface layer n at the lower end of the folding part 23; in this structure, the upper surface layer m is folded inwardly downwardly to wrap the folding part 23 as a whole; and in cooperation therewith, the hydrophilic surface layer 1 is provided with the leakproof partition edges 11 distributed symmetrically, and the leakproof partition edges 11 are combined with the water-repellent bottom layer 3; thus, the SAP material in the absorbent body 2 still maintains a relatively complete structure even after absorbing liquid, and in the step d, the fluff pulp layer 21 on the lower surface layer n between the two folding parts 23 is distributed alternately with the SAP layer 22, and the area of the fluff pulp layer 21 on the surface layer is larger than that of the SAP layer 22; thus, the thickness direction deformation of the whole absorbent body 2 is reduced, and in cooperation with the leakproof partition edges 11 combined with the water-repellent bottom layer 3, the deformation can be reduced as much as possible while the fluff pulp layer 21 and the SAP layer 22 are absorbing liquid, and the possibility of side leakage is reduced (when the baby is lying on one side, the urine is easy to concentrate on one side, and the structure of the first embodiment cannot achieve complete leakage prevention in this case);

[0049] In the device, the discharge slots are arranged at intervals between the discharge slots on the discharge end of the SAP adding device 300a and the cotton forming device 300b, so that the discharge of the cotton forming device 300b and the SAP adding device 300a is arranged at intervals, and the two are distributed alternately in the core to form a single layer and have independent and distinct different liquid absorbing material distribution intervals.

[0050] The SAP adding device 300a includes a material tank, a feeding device, and a discharge controller, and the cotton forming device 300b includes a wood pulp feeding rack, a crusher, and a forming wheel, which are all known to those skilled in the art, and will not be described in detail here.

[0051] Although the present application is specifically shown and described in connection with the preferred embodiments, those skilled in the art should understand that various changes in form and details can be made to the present application without departing from the spirit and scope of the present application defined in the appended claims.

Claims

1. A method for preparing a low reverse osmosis baby diaper, comprising preparing a hydrophilic surface layer (1), preparing an absorbent body (2), preparing a water-repellent bottom layer (3), and cutting after compounding the hydrophilic surface layer (1), the absorbent body (2), and the water-repellent bottom layer (3), characterized in that: The preparation of the absorbent (2) comprises the following steps: a. Take two hydrophilic non-woven fabrics as the upper surface layer (m) and the lower surface layer (n) of the core, and continuously transport them respectively, and define the width direction of the upper surface layer (m) and the lower surface layer (n) as the transverse direction; b. Apply sizing on the upper surface of the lower surface layer (n) and continue to transport it; c. Apply the liquid-absorbing material on the upper surface of the lower surface layer (n), so that the liquid-absorbing material is bonded with the sized lower surface layer (n), and the liquid-absorbing material is composed of fluff pulp and SAP, and after being laid, a separate fluff pulp layer (21) and SAP layer (22) are formed; d. Fold inward and press the two sides of the lower surface layer (n) to which the liquid-absorbing material is applied in step c in the transverse direction, so that the two sides of the continuously transported lower surface layer (n) form a plurality of folded portions (23), the inner side surface of the folded portion (23) is bonded with the fluff pulp layer (21), and the lower surface layer (n) between the two folded portions (23) is distributed with the fluff pulp layer (21) and the SAP layer (22); e. Apply sizing on the lower surface of the upper surface layer (m) and continue to transport it, and make it composite with the lower surface layer (n); f. After the composite, cut to form a single absorbent (2).

2. A method of manufacturing a low reverse osmosis baby diaper according to claim 1, characterized in that: In the above step e, the sizing position of the upper surface layer (m) is located on the two sides in the transverse direction, and the composite position of the upper surface layer (m) and the lower surface layer (n) is located on the upper surface of the folded portion (23).

3. A method of manufacturing a low reverse osmosis baby diaper according to claim 1, characterized in that: In the above step e, the sizing position of the upper surface layer (m) is located on the two sides in the transverse direction, and the composite position of the upper surface layer (m) and the lower surface layer (n) is located on the surface of the lower surface layer (n) at the lower end of the folded portion (23).

4. A method of manufacturing a low reverse osmosis baby diaper according to claim 1, characterized in that: In the above step d, the fluff pulp layer (21) on the lower surface layer (n) between the two folded portions (23) covers the upper surface of the SAP layer (22).

5. A process for the preparation of a low osmotic baby diaper according to claim 1, characterized in that: In the above step d, the fluff pulp layer (21) and the SAP layer (22) on the lower surface layer (n) between the two folded portions (23) are distributed alternately, and the area of the fluff pulp layer (21) on the surface layer is larger than that of the SAP layer (22).

6. A method of making a low reverse osmosis baby diaper according to any one of claims 1-5, characterized in that: The hydrophilic surface layer (1) is provided with symmetrically distributed leakage prevention partitions (11), and the folded portion (23) is located on the inner side of the leakage prevention partition (11).

7. A method of making a low reverse osmosis baby diaper according to any one of claims 1-5, characterized in that: The hydrophilic surface layer (1) is provided with symmetrically distributed leakage prevention partitions (11), and the leakage prevention partition (11) is connected with the water-repellent bottom layer (3).

8. A process for the preparation of a low osmotic baby diaper according to any one of claims 1 to 5, characterized in that: The hydrophilic surface layer (1) and the upper surface layer (m) are provided with a flow guide layer (4).

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