Production method of leakproof adult paper diaper

Abstract

The invention relates to the field of disposable hygienic products, and provides a production method of a leakproof adult paper diaper which comprises a paper diaper body, and the paper diaper body comprises a liquid-permeable top layer, an absorption core layer and a liquid-tight bottom layer which are arranged from top to bottom. The paper diaper comprises a paper diaper body, the paper diaper body is provided with a front end portion located at the front end and a rear end portion located at the rear end, the rear end portion of the paper diaper body is provided with a first leakage-proof piece, the first leakage-proof piece is provided with a first leakage-proof opening with an inward opening, and the first leakage-proof piece can stretch out and draw back in the width direction. According to the leakproof adult paper diaper, the first leakproof piece is arranged at the rear end, the problem that rear leakage is prone to occurring when a woman wears the leakproof adult paper diaper is effectively solved, the first leakproof piece can be telescopically buffered according to the urine amount, the leakproof reliability is further improved, and the technical problem that the leakproof adult paper diaper is poor in rear leakage prevention effect is solved.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene products, and more particularly to a method for producing leak-proof adult diapers. Background Technology

[0002] Currently, adult diapers designed for women typically consist of a permeable top layer, an absorbent core, and a non-permeable bottom layer, arranged from top to bottom. Due to women's physiological characteristics and daily usage scenarios, these diapers are prone to back leakage when there is a lot of urine. Urine easily seeps from the back of the diaper onto clothing, affecting not only comfort and practicality but also causing embarrassment. This fails to meet women's core need for leak-proof adult diapers. Summary of the Invention

[0003] Therefore, to address the aforementioned problems, this invention proposes a method for producing leak-proof adult diapers. This method solves the technical problem of poor back leakage prevention in adult diapers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A method for producing leak-proof adult diapers includes the following steps: (1) Forming of the first leak-proof sheet: The first leak-proof sheet is unwound, cut into sheet-like structures by a cutting device, and transferred and conveyed by the first transfer adsorption wheel; (2) Apply the first leak-proof sheet: spray adhesive on the three edges of the first leak-proof sheet, and the first transfer adsorption wheel applies the first leak-proof sheet to the rear end of the liquid-permeable top layer. The first leak-proof sheet has a first leak-proof port with the opening facing inward. The first leak-proof sheet can stretch and extend in the width direction. (3) Manufacturing the absorbent core layer: The core is formed on the first polymer feeding device, the cutting device cuts the core into block-shaped absorbent core layers, and the third transfer adsorption wheel applies the absorbent core layer to the impermeable top layer. (4) Composite: The liquid-permeable top layer, absorbent core layer and liquid-impermeable bottom layer are composited by a composite roller device; (5) Diaper body forming: The diaper body is formed by cutting through a cutting device.

[0005] Further: It also includes the forming of a second leak-proof sheet: the second leak-proof sheet is unwound, cut into sheet-like structures by a cutting device, and transferred and conveyed by a second transfer adsorption wheel; adhesive is sprayed on the three edges of the second leak-proof sheet, the first leak-proof sheet is applied to the front end of the liquid-permeable top layer, the second leak-proof sheet has a second leak-proof opening facing inward, and the second leak-proof sheet can stretch and contract along the width direction.

[0006] The length of the second leak-proof sheet is less than the length of the first leak-proof sheet, and the second leak-proof sheet can extend and retract along the width direction.

[0007] In method (3), the core is cut by a rolling cutter to form a first guide groove and a second guide groove. The absorbent core layer includes a first absorbent part in the middle and a second absorbent part at the front and rear ends. The width of the first absorbent part is smaller than that of the second absorbent part. The width of the second absorbent part is 1.2-2 times the width of the first absorbent part. The first absorbent part is provided with at least one first guide groove arranged along the length direction. The second absorbent part is provided with at least one second guide groove arranged along the width direction. The first guide groove is connected to the second guide groove. The first guide groove extends into the first leak-proof opening.

[0008] In method (3), the core is formed by feeding the first polymer feeding device. The core includes the following raw materials by mass: 45-55 parts of bleached coniferous sulfate fluff pulp, 25-30 parts of acrylic acid-acrylamide copolymer crosslinked superabsorbent resin, 8-12 parts of polyester / viscose composite bicomponent fiber, 5-8 parts of bamboo charcoal fiber, 2-4 parts of polyethylene glycol modified water-absorbing agent, 1-3 parts of sodium alginate water-locking modifier, 0.5-1.5 parts of polyvinyl acetate binder, and 0.3-0.8 parts of silica breathability regulator. The ratio of the core raw materials of the first absorbent part and the second absorbent part is slightly adjusted according to the above formula. The mass part of acrylic acid-acrylamide copolymer crosslinked superabsorbent resin in the second absorbent part is 3-5 parts more than that in the first absorbent part, and the mass part of bamboo charcoal fiber is 1-2 parts less than that in the first absorbent part.

[0009] In method (2), the first leak-proof sheet includes an absorbent layer and an elastic non-woven fabric layer. The absorbent layer is formed by a second polymer feeding device. The elastic non-woven fabric layer is a breathable material. The adsorption holes of the mold wheel of the second polymer feeding device are arranged at intervals along the length direction, so that the absorbent layer includes multiple absorbent strips arranged along the length direction, and a third guide groove is formed between two adjacent absorbent strips.

[0010] The absorbent layer is formed by feeding the second polymer feeding device. The absorbent layer includes the following raw materials by mass: 30-38 parts of ultrafine hydrophilic polyester fiber, 28-35 parts of montmorillonite modified superabsorbent resin, 3-6 parts of chitosan hydrophilic modifier, 2-5 parts of polyurethane elastic binder, 4-7 parts of polyacrylonitrile hollow fiber, 1-2 parts of microcrystalline cellulose thickener, and 0.5-1 parts of zeolite adsorbent. The absorbent strip is a strip structure formed by mixing the above raw materials. The third guide groove is the gap between the absorbent strips, with a gap width of 2-4 mm. The cross-section of the absorbent strip is semi-circular with a radius of 3-5 mm.

[0011] In method (2), when the second polymer feeding device feeds the absorbent layer to the elastic nonwoven fabric layer, the tension of the elastic nonwoven fabric layer and the absorbent layer is precisely controlled. Let the real-time tension of the elastic nonwoven fabric layer be F1, the elastic elongation of the elastic nonwoven fabric layer be L, and the feeding tension of the absorbent layer be F2. The three satisfy the formula: F2=k×F1×(1+L); where the elastic elongation L is in the range of 5%-15%, the matching coefficient k is the coefficient that matches the air permeability of the elastic nonwoven fabric layer, and the value range is 0.85-0.95. The air permeability of the elastic nonwoven fabric layer is 300-500mm / s, and the value range of F1 is 10-20.

[0012] The width of the first leak-proof sheet is smaller than the width of the liquid-permeable top layer at that location.

[0013] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: The leak-proof adult diaper of this invention features a first leak-proof sheet at the rear end, effectively solving the problem of back leakage that easily occurs when women wear it. Furthermore, the stretchability of the first leak-proof sheet can adjust according to the amount of urine, further enhancing leak-proof reliability. Moreover, the absorbent core employs a multi-component composite formula with differentiated formulations for the first and second absorbent sections, combined with specialized absorbent aids and water-locking modifiers, significantly improving the core's absorption speed, water-locking capacity, and structural strength. Combined with the conductive structure of the first and second diversion channels, this achieves uniform diffusion of liquid within the absorbent core layer, preventing localized accumulation and significantly improving the overall quality of the core layer. In terms of absorption and flow conduction efficiency, the absorbent layer uses montmorillonite-modified superabsorbent resin and ultra-fine hydrophilic polyester fibers as its core, combined with polyurethane elastic binder. This customized formula ensures a high degree of match between the absorbent layer's flexibility and the elasticity of the non-woven fabric layer, enhancing the bonding strength between them and preventing the absorbent strip from shifting or falling off during expansion and contraction. Furthermore, the absorbent strip's structural design, combined with the third flow channel, enables rapid liquid flow at the leak-proof opening, forming a closed-loop liquid conduction system with the first flow channel in the absorbent core layer, further strengthening the product's leak-proof effect. Additionally, through the established tension control formula, based on the elastic non-woven fabric... The precise adjustment of the elastic elongation and air permeability of the fabric layers to regulate the tension of the absorbent layer during feeding achieves formulaic and precise control of the absorbent layer feeding process. This ensures uniform spacing of the absorbent strips and dimensional accuracy of the third guide groove, preventing absorbent layer misalignment caused by tension imbalance and improving the structural consistency of the first leak-proof sheet. Furthermore, the tension control method used in the lamination process, combined with differentiated lamination pressure design for different parts of the absorbent core layer, ensures a tight and wrinkle-free bond between the liquid-permeable top layer, absorbent core layer, and impermeable bottom layer. Simultaneously, it prevents uneven lamination pressure in the first and second guide grooves of the absorbent core layer from causing problems. The deformation ensures the conductivity of the flow channel, while the rounded transition of the flow channel further prevents damage to the channel wall and improves the structural stability of the absorbent core layer and the leak-proof sheet. Furthermore, the parameter design of each step corresponds one-to-one with the structural characteristics of the product. The application positions of the first and second leak-proof sheets, the structural design and raw material formula of the absorbent core layer, and the composite process parameters of each layer are highly coordinated. This not only greatly improves the stability of the production process and the product qualification rate, making it suitable for continuous industrial production, but also simultaneously improves the product's leak-proof performance, absorbency, and user comfort, fully meeting the actual usage needs of incontinence users. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the diaper of the present invention.

[0015] Figure 2 This is a schematic diagram of a diaper with a second leak-proof panel.

[0016] Figure 3This is a schematic diagram of the structure with the first and second guide grooves set on the absorber core layer.

[0017] Figure 4 This is a schematic diagram of the absorber core layer.

[0018] Figure 5 This is a schematic diagram of the structure of the first leak-proof sheet.

[0019] Figure label: 1. Liquid-permeable top layer; 2. Absorbent core layer; 21. First absorbent section; 210. First guide channel; 22. Second absorbent section; 220. Second guide channel; 3. Front end; 4. Rear end; 5. First leak-proof sheet; 50. First leak-proof opening; 51. Water-absorbing layer; 511. Water-absorbing strip; 512. Third guide channel; 52. Non-woven fabric layer; 6. Second leak-proof sheet; 60. Second leak-proof opening. Detailed Implementation

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] refer to Figures 1 to 5 This embodiment provides a method for producing leak-proof adult diapers, including the following methods: (1) Forming of the first leak-proof sheet 5: The first leak-proof sheet 5 is unwound, cut into sheet-like structures by a cutting device, and transferred and conveyed by the first transfer adsorption wheel.

[0022] (2) Apply the first leak-proof sheet 5: Spray adhesive on the three edges of the first leak-proof sheet 5, and the first transfer adsorption wheel applies the first leak-proof sheet 5 to the rear end of the liquid-permeable top layer 1. The first leak-proof sheet 5 has a first leak-proof port 50 with the opening facing inward. The first leak-proof sheet 5 can stretch and extend in the width direction.

[0023] (3) Manufacturing the absorbent core layer 2: The core is formed on the first polymer feeding device, the cutting device cuts the core into block-shaped absorbent core layers 2, and the third transfer adsorption wheel applies the absorbent core layer 2 onto the impermeable top layer 1.

[0024] (4) Composite: The liquid-permeable top layer 1, the absorbent core layer 2 and the liquid-impermeable bottom layer are composited by a composite roller device.

[0025] (5) Diaper body forming: The diaper body is formed by cutting through a cutting device.

[0026] In one embodiment, the process further includes forming a second leak-proof sheet 6: unwinding the second leak-proof sheet 6, cutting it into sheet-like structures using a cutting device, and transferring it via a second transfer adsorption wheel; spraying adhesive onto the three edges of the second leak-proof sheet 6; applying the first leak-proof sheet 5 to the front end of the liquid-permeable top layer 1; the second leak-proof sheet 6 having an inwardly facing second leak-proof opening 60; and the second leak-proof sheet 6 being able to stretch and extend along its width. The diaper body described above has a front end portion 3 located at the front end and a rear end portion 4 located at the rear end, with the first leak-proof sheet 5 located at the rear end portion 4 and the second leak-proof sheet 6 located at the front end portion 3.

[0027] In one embodiment, the length of the second leak-proof sheet 6 is less than the length of the first leak-proof sheet 5, and the second leak-proof sheet 6 is capable of stretching and contracting along the width direction.

[0028] In one embodiment, in method (3), the core is cut by a rolling cutter to form a first guide groove 210 and a second guide groove 220. The absorbent core layer 2 includes a first absorbent part 21 in the middle and a second absorbent part 22 at the front and rear ends. The width of the first absorbent part 21 is smaller than that of the second absorbent part 22. The width of the second absorbent part 22 is 1.2-2 times the width of the first absorbent part 21. The first absorbent part 21 is provided with at least one first guide groove 210 arranged along the length direction. The second absorbent part 22 is provided with at least one second guide groove 220 arranged along the width direction. The first guide groove 210 is connected to the second guide groove 220. The first guide groove 210 extends into the first leak-proof opening 50.

[0029] In one embodiment, in method (3), the core is formed by feeding a first polymer feeding device. The core comprises the following raw materials by mass: 45-55 parts of bleached coniferous sulfate fluff pulp, 25-30 parts of acrylic acid-acrylamide copolymer crosslinked superabsorbent resin, 8-12 parts of polyester / viscose composite bicomponent fiber, 5-8 parts of bamboo charcoal fiber, 2-4 parts of polyethylene glycol modified water-absorbing agent, 1-3 parts of sodium alginate water-locking modifier, 0.5-1.5 parts of polyvinyl acetate binder, and 0.3-0.8 parts of silica breathability regulator. The ratio of the core raw materials of the first absorbent part 21 and the second absorbent part 22 is slightly adjusted to the above formula. The mass of acrylic acid-acrylamide copolymer crosslinked superabsorbent resin in the second absorbent part 22 is increased by 3-5 parts compared with the first absorbent part 21, and the mass of bamboo charcoal fiber is decreased by 1-2 parts compared with the first absorbent part 21.

[0030] In one embodiment, the first leak-proof sheet 5 is located at the end of the absorbent core layer 2, and a portion of the first leak-proof sheet 5 extends to the rear end of the absorbent core layer 2.

[0031] In one embodiment, in method (2), the first leak-proof sheet 5 includes an absorbent layer 51 and an elastic non-woven fabric layer 52. The absorbent layer 51 is formed by a second polymer feeding device. The elastic non-woven fabric layer 52 is a breathable material. The adsorption holes of the mold wheel of the second polymer feeding device are arranged at intervals along the length direction, so that the absorbent layer 51 includes a plurality of absorbent strips 511 arranged along the length direction, and a third guide groove 512 is formed between two adjacent absorbent strips 511.

[0032] In one embodiment, the absorbent layer 51 is formed by feeding a second polymer feeding device. The absorbent layer 51 comprises the following raw materials by mass: 30-38 parts of ultrafine hydrophilic polyester fiber, 28-35 parts of montmorillonite-modified superabsorbent resin, 3-6 parts of chitosan hydrophilic modifier, 2-5 parts of polyurethane elastic binder, 4-7 parts of polyacrylonitrile hollow fiber, 1-2 parts of microcrystalline cellulose thickener, and 0.5-1 parts of zeolite adsorbent. The absorbent strip 511 is a strip structure formed by mixing the aforementioned raw materials. The third guide groove 512 is the gap between the absorbent strips 511, with a gap width of 2-4 mm. The cross-section of the absorbent strip 511 is semi-circular with a radius of 3-5 mm.

[0033] In one embodiment, in method (2), when the second polymer feeding device feeds the absorbent layer 51 to the elastic nonwoven fabric layer 52, the tension of the elastic nonwoven fabric layer 52 and the absorbent layer 51 is precisely controlled. Let the real-time tension of the elastic nonwoven fabric layer 52 be F1, the elastic elongation of the elastic nonwoven fabric layer 52 be L, and the feeding tension of the absorbent layer 51 be F2. The three satisfy the formula: F2=k×F1×(1+L); where the elastic elongation L is in the range of 5%-15%, the matching coefficient k is the coefficient that matches the air permeability of the elastic nonwoven fabric layer 52, and the value range is 0.85-0.95. The air permeability of the elastic nonwoven fabric layer 52 is 300-500mm / s, and the value range of F1 is 10-20.

[0034] In one embodiment, the width of the first leak-proof sheet 5 is smaller than the width of the liquid-permeable top layer 1 at that location.

[0035] In method (4), when the composite roller device is composited, the tension of each layer and the linear velocity of the composite roller are adjusted synchronously. Let the tension of the liquid-permeable top layer 1 be F3, the tension of the absorbent core layer 2 be F4, the tension of the liquid-impermeable bottom layer be F5, the linear velocity of the composite roller be v, and the total tension of the composite roller be Fn. The three satisfy the tension ratio formula: F3:F4:F5=1:(0.8-0.9):(1.1-1.2), and the total tension and linear velocity satisfy the formula: Fn=K×v×v, where the composite coefficient K ranges from 0.02 to 0.05, the linear velocity v of the composite roller ranges from 20 to 40 m / min, and the value of Fn ranges from 8 to 64 N.

[0036] The composite pressure of the composite roller device is 0.3-0.5MPa, and the pressure of the first absorption part 21 of the absorption core layer 2 corresponding to the composite roller is 0.05-0.1MPa lower than that of the second absorption part 22 during composite. The groove depth of the first guide groove 210, the second guide groove 220 and the third guide groove 512 are all 1.5-3mm, and the groove width is all 2-4mm. The groove walls of the first guide groove 210 and the third guide groove 512 are all treated with arc transition, and the arc radius is 0.5-1mm.

[0037] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A method for producing leak-proof adult diapers, characterized in that: Including the following methods: (1) Forming of the first leak-proof sheet: The first leak-proof sheet is unwound, cut into sheet-like structures by a cutting device, and transferred and conveyed by the first transfer adsorption wheel; (2) Apply the first leak-proof sheet: spray adhesive on the three edges of the first leak-proof sheet, and the first transfer adsorption wheel applies the first leak-proof sheet to the rear end of the liquid-permeable top layer. The first leak-proof sheet has a first leak-proof port with the opening facing inward. The first leak-proof sheet can stretch and extend in the width direction. (3) Manufacturing the absorbent core layer: The core is formed on the first polymer feeding device, the cutting device cuts the core into block-shaped absorbent core layers, and the third transfer adsorption wheel applies the absorbent core layer to the impermeable top layer. (4) Composite: The liquid-permeable top layer, absorbent core layer and liquid-impermeable bottom layer are composited by a composite roller device; (5) Diaper body forming: The diaper body is formed by cutting through a cutting device.

2. The method for producing a leak-proof adult diaper according to claim 1, characterized in that: It also includes the forming of a second leak-proof sheet: the second leak-proof sheet is unwound, cut into sheet-like structures by a cutting device, and transferred and conveyed by a second transfer adsorption wheel; adhesive is sprayed on the three edges of the second leak-proof sheet, the first leak-proof sheet is applied to the front end of the liquid-permeable top layer, the second leak-proof sheet has a second leak-proof opening facing inward, and the second leak-proof sheet can stretch and contract along the width direction.

3. The method for producing a leak-proof adult diaper according to claim 2, characterized in that: The length of the second leak-proof sheet is less than the length of the first leak-proof sheet, and the second leak-proof sheet can extend and retract along the width direction.

4. The method for producing a leak-proof adult diaper according to claim 1, characterized in that: In method (3), the core is cut by a rolling cutter to form a first guide groove and a second guide groove. The absorbent core layer includes a first absorbent part in the middle and a second absorbent part at the front and rear ends. The width of the first absorbent part is smaller than that of the second absorbent part. The width of the second absorbent part is 1.2-2 times the width of the first absorbent part. The first absorbent part is provided with at least one first guide groove arranged along the length direction. The second absorbent part is provided with at least one second guide groove arranged along the width direction. The first guide groove is connected to the second guide groove. The first guide groove extends into the first leak-proof opening.

5. The method for producing a leak-proof adult diaper according to claim 4, characterized in that: In method (3), the core is formed by feeding the first polymer feeding device. The core includes the following raw materials by mass: 45-55 parts of bleached coniferous sulfate fluff pulp, 25-30 parts of acrylic acid-acrylamide copolymer crosslinked superabsorbent resin, 8-12 parts of polyester / viscose composite bicomponent fiber, 5-8 parts of bamboo charcoal fiber, 2-4 parts of polyethylene glycol modified water-absorbing agent, 1-3 parts of sodium alginate water-locking modifier, 0.5-1.5 parts of polyvinyl acetate binder, and 0.3-0.8 parts of silica breathability regulator. The ratio of the core raw materials of the first absorbent part and the second absorbent part is slightly adjusted according to the above formula. The mass part of acrylic acid-acrylamide copolymer crosslinked superabsorbent resin in the second absorbent part is 3-5 parts more than that in the first absorbent part, and the mass part of bamboo charcoal fiber is 1-2 parts less than that in the first absorbent part.

6. The method for producing a leak-proof adult diaper according to claim 1, characterized in that: The first leak-proof sheet is located at the end of the absorbent core layer, and a portion of the first leak-proof sheet extends to the rear end of the absorbent core layer.

7. The method for producing a leak-proof adult diaper according to claim 1, characterized in that: In method (2), the first leak-proof sheet includes an absorbent layer and an elastic non-woven fabric layer. The absorbent layer is formed by a second polymer feeding device. The elastic non-woven fabric layer is a breathable material. The adsorption holes of the mold wheel of the second polymer feeding device are arranged at intervals along the length direction, so that the absorbent layer includes multiple absorbent strips arranged along the length direction, and a third guide groove is formed between two adjacent absorbent strips.

8. The method for producing a leak-proof adult diaper according to claim 7, characterized in that: The absorbent layer is formed by feeding the second polymer feeding device. The absorbent layer includes the following raw materials by mass: 30-38 parts of ultrafine hydrophilic polyester fiber, 28-35 parts of montmorillonite modified superabsorbent resin, 3-6 parts of chitosan hydrophilic modifier, 2-5 parts of polyurethane elastic binder, 4-7 parts of polyacrylonitrile hollow fiber, 1-2 parts of microcrystalline cellulose thickener, and 0.5-1 parts of zeolite adsorbent. The absorbent strip is a strip structure formed by mixing the above raw materials. The third guide groove is the gap between the absorbent strips, with a gap width of 2-4 mm. The cross-section of the absorbent strip is semi-circular with a radius of 3-5 mm.

9. The method for producing a leak-proof adult diaper according to claim 7, characterized in that: In method (2), when the second polymer feeding device feeds the absorbent layer to the elastic nonwoven fabric layer, the tension of the elastic nonwoven fabric layer and the absorbent layer is precisely controlled. Let the real-time tension of the elastic nonwoven fabric layer be F1, the elastic elongation of the elastic nonwoven fabric layer be L, and the feeding tension of the absorbent layer be F2. The three satisfy the formula: F2=k×F1×(1+L); where the elastic elongation L is in the range of 5%-15%, the matching coefficient k is the coefficient that matches the air permeability of the elastic nonwoven fabric layer, and the value range is 0.85-0.

95. The air permeability of the elastic nonwoven fabric layer is 300-500mm / s, and the value range of F1 is 10-20.

10. The method for producing a leak-proof adult diaper according to claim 1, characterized in that: The width of the first leak-proof sheet is smaller than the width of the liquid-permeable top layer at that location.

Images