A diaper with a leak-proof core and its preparation method

Abstract

This invention relates to the field of diaper technology, providing a diaper with a leak-proof core and its manufacturing method, solving the problem of heavy and costly diapers caused by the addition of an independent leak-proof layer in existing leak-proof technologies. The invention includes a diaper body comprising a top layer, a bottom layer, and an absorbent core located between the top and bottom layers. The absorbent core consists of absorbent units and a covering layer. The length direction of the absorbent core is defined as longitudinal, and the width direction as transverse. The covering layer comprises an upper film and a lower film bonded together by heat pressing. The absorbent unit includes a square area in the center and at least one set of extension areas on both sides of the square area. Unlike traditional square or outwardly flared absorbent cores, this invention uses extension areas on one or both sides of the transverse central axis of the square area and at the ends of the square area, thereby expanding the absorbent area and actively preventing side leakage structurally.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paper diapers, in particular to a paper diaper with a side leakage prevention core and a preparation method thereof. BACKGROUND

[0002] In the prior art, in order to improve the side leakage prevention performance of paper diapers, the industry has made many attempts. Chinese Patent Publication No. CN119523736A discloses a paper diaper, which comprises a skin-friendly layer, a urine absorption product and a liquid-impermeable bottom layer arranged in sequence. A waist leakage prevention structure is arranged between the skin-friendly layer and the liquid-impermeable bottom layer. The urine absorption product is arranged in the interlayer region between the skin-friendly layer and the waist leakage prevention structure.

[0003] The present application solves the problem of side leakage by arranging an independent waist leakage prevention structure between the skin-friendly layer and the liquid-impermeable bottom layer. The structure is composed of a liquid storage core and a flow guide core, which utilize the difference in material composition (such as different proportions of SAP and modified fluff pulp) and surface tension effect between the two to guide and lock the liquid. However, this scheme adds an independent, functionally combined waist leakage prevention structure layer to the traditional absorption core, which undoubtedly increases the amount of material and the thickness of the product, which is contrary to the development trend of light and thin paper diapers with high cost performance. SUMMARY

[0004] Therefore, in view of the above problems, the present application provides a paper diaper with a side leakage prevention core and a preparation method thereof, which solves the problem of thick and heavy paper diaper structure and high cost caused by the addition of an independent leakage prevention layer in the prior art.

[0005] To achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0006] A paper diaper with a side leakage prevention core, comprising a paper diaper body, the paper diaper body comprising a surface layer, a bottom layer and an absorption core between the surface layer and the bottom layer, the absorption core being composed of an absorption unit and a coating layer, the length direction of the absorption core being defined as the longitudinal direction, and the width direction being defined as the transverse direction, the coating layer comprising an upper film and a lower film hot-pressed together, the absorption unit comprising a square region in the middle and at least one group of extension regions arranged on both sides of the square region, the extension region comprising a middle extension region arranged on one side or both sides of the transverse central axis of the square region and an end extension region arranged at the end of the square region, the upper film and the lower film being hot-pressed on both sides of the absorption unit to form a side edge sealing area without absorption material.

[0007] Further, the thickness of the extension region gradually decreases from the square region to the side edge direction.

[0008] Further, the connection between the extension region and the square region is an arc-shaped transition.

[0009] Further, the width of the side sealing area is 3-10mm.

[0010] Further, the span of the extension area in the transverse direction is 15%-35% of the total span of the absorbent unit at the position where the extension area is located.

[0011] Further, the span of the end extension area in the transverse direction is greater than that of the middle extension area.

[0012] A preparation method of a paper diaper with a side leakage prevention core, for preparing the paper diaper with a side leakage prevention core as described above, comprising the following steps:

[0013] S1, providing a continuously running lower film and a bottom layer, compounding the lower film and the bottom layer, and laying absorbent units on the lower film at predetermined intervals;

[0014] S2, spraying a glue layer on the inner side of the continuously running upper film at intervals, and the position of the glue layer is located at the projection of the absorbent unit on both sides;

[0015] S3, guiding the upper film after spraying the glue layer and the lower film laid with the absorbent units to a hot pressing compound roller group, and compounding at a temperature of 60-100℃ and a pressure of 0.3-0.8MPa, so that the upper film is bonded to the lower film through the glue layer, the side sealing area is formed, and a continuous core semi-finished product is obtained;

[0016] S4, assembling the continuous core semi-finished product with a surface layer, and obtaining the paper diaper with a side leakage prevention core after slitting.

[0017] Further, in step S2, the glue layers on the same side have different widths, and the width of the glue layer at the projection of the extension area is greater than that at other positions.

[0018] Further, in step S1, before laying the absorbent units, a plurality of dot-shaped glue layers for preliminary positioning are sprayed on the lower film in the projection area corresponding to the square area of the absorbent unit.

[0019] Further, in step S1, before compounding the lower film and the bottom layer, glue strips are sprayed on the bottom layer at intervals.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] 1、The application is distinguished from the traditional square or two-end outwardly expanded absorbent core, the adopted absorbent core is provided with an extension area on one side or both sides of the transverse middle axis of the square area and the end of the square area, the expansion of the absorption area is realized, the urine which attempts to spread horizontally is intercepted and absorbed in advance, the side leakage is actively prevented from the structure, and the external leakage prevention barrier is not relied on, the middle extension area is arranged on one side or both sides of the transverse middle axis of the square area according to the different urine distribution conditions of male or female babies, the transverse span of the absorbent core in the specific area is increased, the diffusible width of the urine in the front side or the middle part is increased, and thus the side leakage is avoided.

[0022] 2、The edge of the adopted absorbent core is a non-uniform structure, which is distinguished from the form that the traditional absorbent core is wrapped by a single layer of fabric, the upper layer film and the lower layer film are pressed and coated, and the industrial production can be efficiently and continuously realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is a preparation flowchart of the diaper body of the embodiment one of the application.

[0024] Fig. 2 It is an unfolded structure diagram of the diaper body of the embodiment one of the application.

[0025] EXPLANATION OF REFERENCE NUMBERS:

[0026] The diaper body 1;

[0027] The surface layer 2;

[0028] The bottom layer 3;

[0029] The absorbent core 4;

[0030] The absorption unit 5; the square main absorption area 51; the extension area 52; the middle extension area 521; the end extension area 522; the side edge sealing area 53;

[0031] The upper layer film 6;

[0032] The lower layer film 7. DETAILED DESCRIPTION

[0033] The embodiment of the application will be described in detail below in combination with specific embodiments, so that the realization process of how the application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented.

[0034] Embodiment one: as Figs. 1-2As shown, the present embodiment provides a paper diaper with a side leakage prevention core. The paper diaper comprises a paper diaper body 1, which comprises a top layer 2, a bottom layer 3, and an absorbent core 4 between the top layer 2 and the bottom layer 3, the absorbent core 4 is composed of an absorbent unit 5 and a cladding layer, the length direction of the absorbent core 4 is defined as the longitudinal direction, and the width direction is defined as the transverse direction.

[0035] The top layer 2 is made of a spun-bond non-woven fabric or a thermal calendered non-woven fabric with excellent fluid conductivity, which can quickly penetrate liquid and quickly guide urine from its initial contact point to a larger area, avoiding the rapid saturation of local areas and creating conditions for uniform absorption of the underlying absorbent core 4.

[0036] The absorbent core 4 is composed of an absorbent unit 5 and a cladding layer, the cladding layer includes an upper film 6 and a lower film 7. The upper film 6 is made of a through-air non-woven fabric that allows urine to pass smoothly and has a certain degree of hydrophilicity and loft, which can improve the comfort of use, and the lower film 7 is made of a liquid-impermeable polyethylene casting film to prevent liquid leakage.

[0037] The bottom layer 3 is made of a spun-bond non-woven fabric, which has a relatively smooth and flat surface, excellent wear resistance, and is not prone to pilling when rubbed, and is used to bond with the lower film 7 to provide structural strength.

[0038] The absorbent unit 5 is composed of a mixture of fluff pulp fibers and high molecular water-absorbing resin, and is encapsulated between the upper and lower films. The structure of the absorbent unit 5 includes a square main absorption area 51 in the middle and extension areas 52 extending from both sides of the square area. The extension areas 52 are further divided into middle extension areas 521 on one or both sides of the transverse central axis of the square area and end extension areas 522 at the front and rear ends of the square area. In the present embodiment, the middle extension areas 521 are located on one side of the transverse central axis of the square area. In order to more effectively prevent back leakage when the baby is lying down, the span of the end extension areas 522 in the transverse direction is designed to be greater than that of the middle extension areas 521.

[0039] On both sides of the absorbent unit 5, the upper through-air non-woven fabric and the lower polyethylene casting film are directly compounded together by a hot pressing process to form a side edge sealing area 53 without absorbent material, the width of the side edge sealing area 53 is controlled between 3mm-10mm, preferably 10mm.

[0040] In addition, the thickness of the extension zone 52 gradually decreases from the square main absorption zone 51 to the side direction, forming a gentle arc slope, which has two effects: first, it makes the transition of the core edge to the inside of the baby's thigh smoother, significantly improving the wearing comfort, avoiding indentation and friction; second, this arc slope structure is conducive to the smooth diffusion and conduction of liquid; the width of the extension zone 52 also gradually decreases from the square main absorption zone 51 to the side direction; the span of the extension zone 52 in the transverse direction is 15%-35% of the total span of the absorption unit 5 at its location, among which the middle extension zone 521 is preferably 15%, and the end extension zone 522 is preferably 35%.

[0041] Embodiment two: The present embodiment provides a preparation method for manufacturing the paper diaper with the side leakage prevention core as described in embodiment one.

[0042] A continuously running spunbond nonwoven fabric is provided as the bottom layer 3, and adhesive strips are sprayed on the bottom layer 3 at intervals, a continuously coiled polyethylene casting film is provided as the lower film 7, and the lower film 7 is conveyed along the production line, and the lower film 7 and the bottom layer 3 are hot-pressed and compounded.

[0043] Before laying the absorption material, in order to ensure the stability of the subsequent process, a plurality of tiny point-shaped hot melt adhesive layers are sprayed on the lower film 7 in the projection area corresponding to the placement of the square main absorption zone 51; then, through a negative pressure forming grinding wheel, the mixed fluff pulp and high molecular water-absorbing resin are formed into an absorption unit with a three-dimensional structure of the square main absorption zone 51, the middle extension zone 521 and the end extension zone 522, and the pre-sprayed point-shaped glue can simply and preliminarily fix the loose absorption unit 5, only to prevent displacement during conveying.

[0044] A continuously coiled hot air nonwoven fabric is provided as the upper film 6, and two strip-shaped hot melt adhesives are sprayed on the inner side of the upper film 6 at intervals, and the positions of the adhesive lines are set on the two sides corresponding to the projection of the absorption unit 5, in particular, in order to provide stronger bonding force in the area with greater side leakage prevention pressure, the sprayed adhesive strip width is greater in the projection section corresponding to the extension zone 52, and the adhesive strip width is relatively narrow in the section corresponding to the side of the square main absorption zone 51.

[0045] The upper film 6 with the sprayed adhesive layer and the lower film 7 with the laid absorption unit 5 are guided together between a set of hot-pressing compound rollers, and are pressed at a temperature of 80°C and a pressure of 0.6MPa, forming side sealing zones 53 on both sides of the absorption unit, and obtaining a continuous core semi-finished product.

[0046] The continuous core semi-finished product is cut into single independent absorbent cores 4, the topsheet 2 is guided and compounded on the top of the absorbent core 4 on the final assembly line of the diaper, in the process, the leg and waist elastic members are simultaneously compounded in a stretched state to the predetermined position between the topsheet and the backsheet, through subsequent processes such as molding, cutting, folding, etc., the diaper with side leakage prevention core is prepared.

[0047] Although the present application has been specifically shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application as defined in the appended claims.

Claims

1. A paper diaper with a side leakage prevention core, comprising a paper diaper body, the paper diaper body comprising a topsheet, a backsheet, and an absorbent core between the topsheet and the backsheet, the absorbent core being composed of an absorbent unit and a cover layer, a length direction of the absorbent core being defined as a longitudinal direction, and a width direction of the absorbent core being defined as a transverse direction, characterized in that: The cover layer comprises an upper film and a lower film which are hot-pressed together, the absorption unit comprises a square area in the middle and at least one set of extension areas on both sides of the square area, the extension areas comprise middle extension areas on one side or both sides of the lateral central axis of the square area and end extension areas at the ends of the square area, the upper film and the lower film are hot-pressed on both sides of the absorption unit to form side edge sealing areas without absorption material; The thickness of the extension area gradually decreases from the square area to the side direction; The connection between the extension area and the square area is an arc-shaped transition; The span of the extension area in the transverse direction is 15%-35% of the total span of the absorption unit at its location.

2. The paper diaper with side leakage prevention core according to claim 1, characterized in that: The width of the side edge sealing area is 3mm-10mm.

3. The paper diaper with side leakage prevention core according to claim 1, characterized in that: The span of the end extension area in the transverse direction is greater than that of the middle extension area.

4. A method of manufacturing a paper diaper with a side leakage preventing core, for manufacturing the paper diaper with a side leakage preventing core according to any one of claims 1 to 3, characterized by, The method comprises the following steps: S1, providing a continuously running lower film and a bottom layer, combining the lower film and the bottom layer, and laying the absorption unit on the lower film at a predetermined interval; S2, spraying a glue layer on the inner side of the continuously running upper film at intervals, and the position interval of the glue layer is on both sides of the projection of the absorption unit; S3, guiding the upper film with the sprayed glue layer and the lower film with the laid absorption unit to a hot-pressing roller group, and performing hot-pressing at a temperature of 60-100℃ and a pressure of 0.3-0.8MPa to make the upper film adhere to the lower film through the glue layer, form the side edge sealing area, and obtain a continuous core body semi-finished product; S4, assembling the continuous core body semi-finished product with a surface layer, and obtaining the paper diaper with side leakage prevention core body after slitting.

5. The method of claim 4, wherein the paper diaper with a side leakage prevention core is prepared by the steps of: In step S2, the glue layers on the same side have different widths, and the width of the glue layer at the projection of the extension area is greater than that at other positions. ​ 6. The method of claim 4, wherein the paper diaper with a side leakage prevention core is prepared by the steps of: In step S1, before laying the absorption unit, a plurality of dot-shaped glue layers for preliminary positioning are sprayed on the lower film in the projection area corresponding to the square area of the absorption unit. ​ 7. The method of claim 4, wherein the paper diaper with a side leakage prevention core is prepared by the steps of: In step S1, before the lower film is combined with the bottom layer, glue strips are sprayed on the bottom layer at intervals. ​

Images