Preparation method of absorbing product for adult incontinence

Abstract

The invention relates to the technical field of absorption products, provides a preparation method of an absorption product for adult incontinence, and solves the problem that particles are easy to leak when the particle content is high in the preparation link of the existing absorption product. The preparation method comprises the following steps: S1, preparing a core body, namely preparing a mixed core body of wood pulp fibers and high-molecular water-absorbent resin particles according to a preset gram weight ratio by utilizing a negative pressure mold wheel; s2, particle screening: before the core body is transferred to a surface layer from the negative-pressure mold wheel, performing dynamic negative-pressure screening treatment on the core body by a pressure difference suspension part to remove the high-molecular water-absorbent resin particles which are not firmly combined with the core body, and separating the high-molecular water-absorbent resin particles which are not firmly combined with a core body matrix from the core body matrix due to gravity and airflow disturbance, so as to obtain the high-molecular water-absorbent resin particles which are not firmly combined with the core body matrix; the differential pressure suspension part is arranged on one side of the negative pressure mold wheel; a traditional production process is broken through, a dynamic screening procedure is implanted before core-surface layer compounding, and SAP leakage is eliminated from the source.

Description

Technical Field

[0001] The present invention relates to the technical field of absorbent products, and in particular to a method for preparing an absorbent product for adult incontinence. Background Art

[0002] Demand for adult incontinence products is surging. Existing products, due to the high polymer (SAP) content in the absorbent core (a composite structure of SAP and wood pulp), are prone to particle leakage during the production process. When SAP residue remains on the edges of the product, direct contact with the skin can cause severe discomfort (friction and moisture irritation), a long-standing pain point in the industry.

[0003] Chinese patent publication number CN110464547A discloses a three-dimensional composite core and its preparation method and application. The three-dimensional composite core includes, from bottom to top, a first breathable sheet layer, an intermediate absorbent layer, and a second breathable sheet layer; the first breathable sheet layer and the second breathable sheet layer are respectively positioned on the upper and lower sides of the intermediate absorbent layer by positioning hot melt adhesive; the intermediate absorbent layer is formed by evenly mixing water-absorbing particles with molded hot melt adhesive to form a water-absorbing layer with a certain three-dimensional shape and spaced arrangement.

[0004] The middle absorption layer of the three-dimensional composite core of this invention is formed by uniformly mixing and molding water-absorbing particles and molded hot-melt adhesive. After absorbing liquid, the water-absorbing particles will not transfer or fall off due to the poor moisture resistance of the molded hot-melt adhesive. However, since the core is prone to particle leakage during the production process, especially when the polymer (SAP) content is high, the leakage is particularly obvious. When SAP remains on the edge of the product, direct contact with the skin will cause severe discomfort. Summary of the Invention

[0005] Therefore, in order to solve the above problems, the present invention provides a method for preparing an absorbent product for adult incontinence, which solves the problem that particles are easily leaked when the particle content is high in the preparation process of existing absorbent products.

[0006] To achieve the above object, the present invention is achieved through the following technical solutions: A method for preparing an absorbent product for adult incontinence, comprising the following steps: S1, core preparation, using a negative pressure die wheel to prepare a mixed core of wood pulp fibers and high molecular water-absorbing resin particles according to a predetermined weight ratio; S2, particle screening: Before the core is transferred from the negative pressure die wheel to the surface layer, the core is subjected to dynamic negative pressure screening by a pressure differential suspension component to remove polymer water-absorbing resin particles that are not firmly bonded to the core. The polymer water-absorbing resin particles that are not firmly bonded to the core matrix are separated from the core matrix due to gravity and airflow disturbance. The pressure differential suspension component is located on one side of the negative pressure die wheel; S3, compounding, pressing the core body after particle screening in step S2 onto the surface layer through a transfer wheel to ensure that no particles remain on the edge of the product; S4, performing forming, cutting and packaging steps to obtain the adult incontinence absorbent product.

[0007] Furthermore, in step S1, the mass ratio of the polymer water-absorbing resin particles to the core matrix is ​​greater than 0.6.

[0008] Furthermore, in step S3, the composite process uses a low-disturbance transfer wheel for pressing to avoid damage to the core structure and secondary shedding of the polymer water-absorbing resin particles.

[0009] Furthermore, the SAP residue in the edge area of ​​the adult incontinence absorbent product is less than 0.01%.

[0010] Furthermore, the pressure differential suspension component includes a negative pressure chamber, conveying rollers arranged on both sides of the negative pressure chamber and a conveyor belt connecting the two conveying rollers. The conveyor belt is provided with a plurality of inclined holes, and the inclined direction of each inclined hole is downward or upward.

[0011] Furthermore, the negative pressure chamber has a strip-shaped air outlet spaced apart along the width direction of the conveyor belt on one side close to the negative pressure die wheel, and each of the inclined holes is arranged corresponding to each of the air outlets.

[0012] Furthermore, in step S2, the negative pressure value of the pressure differential suspension component is ≥-500 Pa, and the time for the core to pass through the pressure differential suspension component is at least 3 seconds.

[0013] Furthermore, the core body and the pressure differential suspension component are spaced apart by a distance of 2 mm to 10 mm.

[0014] Furthermore, in step S2, the detached polymer water-absorbing resin particles are collected and recovered in real time by the collecting component at the bottom of the pressure difference suspension component to achieve in-situ reuse. The collecting component includes a porous collecting plate, a collecting chamber located below the porous collecting plate, and a pneumatic conveying pipe connected to the bottom of the collecting chamber.

[0015] Furthermore, the negative pressure value in the pneumatic conveying pipeline is maintained at -1kPa to -5kPa to ensure that the detached polymer water-absorbing resin particles are efficiently transported to the front negative pressure mold wheel to prepare the mixed core.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This application breaks through the traditional production process by implanting a dynamic screening process before the core-surface layer is composited, eliminating SAP leakage from the source, and achieving efficient separation of free SAP by precisely controlling the airflow field without destroying the structural integrity of the core. It develops a directional airflow recovery channel to allow the shed SAP to be directly backfilled to the raw material end, reducing raw material loss, and producing the first incontinence product with an edge SAP residue of less than 0.01%, which has passed the medical device-grade skin irritation certification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the pressure differential suspension component according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the inclined hole arrangement according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the air outlet arrangement structure according to an embodiment of the present invention.

[0018] Description of Figure Numbers: Negative pressure die wheel 1; forming die cavity 11; raw material bin 12; Pressure differential suspension component 2; negative pressure chamber 21; air outlet 211; conveying roller 22; conveyor belt 23; inclined hole 231; Transfer wheel 3; Surface layer 4; Collecting component 5; porous collecting plate 51; collecting chamber 52; pneumatic conveying pipe 53. DETAILED DESCRIPTION

[0019] The following will describe the implementation methods of the present invention in detail with reference to specific embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0020] Example 1: Figures 1 to 3 As shown, a method for preparing an adult incontinence absorbent product comprises the following steps: S1. Core preparation: A mixed core of wood pulp fibers and polymer water-absorbent resin particles is prepared using a negative pressure die wheel 1 according to a predetermined gram weight ratio. The mass ratio of the polymer water-absorbent resin particles to the core matrix is ​​>0.6, preferably 0.6-0.7. In this embodiment, 0.65 is used. The use of a negative pressure die wheel 1 to prepare a mixed core of wood pulp fibers and polymer water-absorbent resin particles is a traditional process technology and will not be repeated here.

[0021] S2. Particle screening. Before the core is transferred from the negative pressure die wheel 1 to the surface layer, the core is subjected to dynamic negative pressure screening treatment by the pressure difference suspension component 2 to remove the polymer water-absorbing resin particles that are not firmly bonded to the core. The polymer water-absorbing resin particles that are not firmly bonded to the core matrix are separated from the core matrix due to gravity and airflow disturbance. The pressure difference suspension component 2 is arranged on one side of the negative pressure die wheel 1.

[0022] Specifically, after the forming cavity 11 on the negative pressure die wheel 1 rotates to the bottom of the raw material bin 12 to form a core body, the negative pressure die wheel 1 continues to rotate the forming cavity 11 to the pressure differential suspension component 2 set on one side thereof. The time it takes to pass through the pressure differential suspension component 2 is at least 3s, preferably 3-6s. In this embodiment, the passing time is 3s, and its residence time increases with the increase in the thickness of the core body. The negative pressure value of the pressure differential suspension component 2 is ≥-500Pa, preferably -500 to -600Pa. In this embodiment, the negative pressure value of the pressure differential suspension component 2 is -600Pa, and the spacing distance between the core body and the pressure differential suspension component 2 is 2mm to 10mm. The spacing distance decreases as the negative pressure value of the pressure differential suspension component 2 increases. In this embodiment, the spacing distance between the core body and the pressure differential suspension component 2 is 10mm.

[0023] S3, compounding, pressing the core body after particle screening in step S2 onto the surface layer 4 through the transfer wheel 3 to ensure that no particles remain on the edge of the product.

[0024] S4. Performing molding, cutting, and packaging steps to obtain the adult incontinence absorbent product, wherein the SAP residue in the edge area of ​​the adult incontinence absorbent product is less than 0.01%.

[0025] In step S3, the composite process uses three rounds of low-disturbance transfer for pressing to avoid damage to the core structure and secondary shedding of the polymer water-absorbing resin particles.

[0026] The pressure differential suspension component 2 includes a negative pressure chamber 21, conveying rollers 22 arranged on both sides of the negative pressure chamber 21, and a conveying belt 23 connecting the two conveying rollers 22. The conveying belt 23 is provided with a plurality of inclined holes 231, and the inclined direction of each inclined hole 231 is downward or upward.

[0027] Specifically, the inclined holes 231 on the conveyor belt 23 are grouped together. The inclined directions of the inclined holes 231 in the same group are consistent, and the inclined directions of the inclined holes 231 in adjacent groups are opposite. The inclined holes 231 in different directions help to disturb the air and cooperate with the gravity of the particles themselves to quickly peel off particles with weak binding.

[0028] The negative pressure chamber 21 has a long strip of air outlets 211 arranged at intervals along the width direction of the conveyor belt 23 on the side close to the negative pressure die wheel 1. Each of the inclined holes 231 is arranged corresponding to each of the air outlets 211. The air outlets 211 arranged at intervals help to form intermittent disturbed wind, which is beneficial for some free wood pulp fibers to fall more quickly and avoid flying.

[0029] In step S2, the detached polymer water-absorbing resin particles are collected and recovered in real time by the collecting component 5 at the bottom of the pressure difference suspension component 2 to achieve in-situ reuse. The collecting component 5 includes a porous collecting plate 51, a collecting chamber 52 provided below the porous collecting plate 51, and a pneumatic conveying pipe 53 connected to the bottom of the collecting chamber 52; the negative pressure value in the pneumatic conveying pipe 53 is maintained at -1kPa to -5kPa to ensure that the detached polymer water-absorbing resin particles are efficiently transported to the front negative pressure die wheel 1 to prepare the mixed core link.

[0030] Example 2: A method for preparing an absorbent product for adult incontinence, comprising the following steps: S1. Core preparation: A mixed core of wood pulp fibers and polymer water-absorbent resin particles is prepared using a negative pressure die wheel according to a predetermined gram weight ratio. The mass ratio of the polymer water-absorbent resin particles to the core matrix is ​​>0.6, preferably 0.6-0.7. In this embodiment, 0.65 is used. The use of a negative pressure die wheel to prepare a mixed core of wood pulp fibers and polymer water-absorbent resin particles is a traditional process technology and will not be repeated here.

[0031] S2. Particle screening. Before the core is transferred from the negative pressure die wheel to the surface layer, the core is subjected to dynamic negative pressure screening by a pressure differential suspension component to remove the polymer water-absorbing resin particles that are not firmly bonded to the core. The polymer water-absorbing resin particles that are not firmly bonded to the core matrix are separated from the core matrix due to gravity and airflow disturbance. The pressure differential suspension component is arranged on one side of the negative pressure die wheel.

[0032] Specifically, after the forming cavity on the negative pressure die wheel rotates to the bottom of the raw material bin to form a core body, the negative pressure die wheel continues to rotate the forming cavity to the pressure differential suspension component set on one side of it and then stops. The time it passes through the pressure differential suspension component is at least 3s, preferably 3-6s. In this embodiment, the passing time is 4s, and its residence time increases with the increase in the thickness of the core body. The negative pressure value of the pressure differential suspension component is ≥-500Pa, preferably -500 to -600Pa. In this embodiment, the negative pressure value of the pressure differential suspension component is -575Pa. The spacing distance between the core body and the pressure differential suspension component is 2mm to 10mm, and the spacing distance decreases as the negative pressure value of the pressure differential suspension component increases. In this embodiment, the spacing distance between the core body and the pressure differential suspension component is 8mm.

[0033] S3, compounding, pressing the core body after particle screening in step S2 to the surface layer through a transfer wheel to ensure that no particles remain on the edge of the product.

[0034] S4. Performing molding, cutting, and packaging steps to obtain the adult incontinence absorbent product, wherein the SAP residue in the edge area of ​​the adult incontinence absorbent product is less than 0.01%.

[0035] Example 3: A method for preparing an absorbent product for adult incontinence, comprising the following steps: S1. Core preparation: A mixed core of wood pulp fibers and polymer water-absorbent resin particles is prepared using a negative pressure die wheel according to a predetermined gram weight ratio. The mass ratio of the polymer water-absorbent resin particles to the core matrix is ​​>0.6, preferably 0.6-0.7. In this embodiment, 0.7 is used. The use of a negative pressure die wheel to prepare a mixed core of wood pulp fibers and polymer water-absorbent resin particles is a traditional process technology and will not be repeated here.

[0036] S2. Particle screening. Before the core is transferred from the negative pressure die wheel to the surface layer, the core is subjected to dynamic negative pressure screening by a pressure differential suspension component to remove the polymer water-absorbing resin particles that are not firmly bonded to the core. The polymer water-absorbing resin particles that are not firmly bonded to the core matrix are separated from the core matrix due to gravity and airflow disturbance. The pressure differential suspension component is arranged on one side of the negative pressure die wheel.

[0037] Specifically, after the forming cavity on the negative pressure die wheel rotates to the bottom of the raw material bin to form a core body, the negative pressure die wheel continues to rotate the forming cavity to the pressure differential suspension component set on one side of it and then stops. The time it passes through the pressure differential suspension component is at least 3s, preferably 3-6s. In this embodiment, the passing time is 5s, and its residence time increases with the increase in the thickness of the core body. The negative pressure value of the pressure differential suspension component is ≥-500Pa, preferably -500 to -600Pa. In this embodiment, the negative pressure value of the pressure differential suspension component is -525Pa, and the spacing distance between the core body and the pressure differential suspension component is 2mm to 10mm. The spacing distance decreases as the negative pressure value of the pressure differential suspension component increases. In this embodiment, the spacing distance between the core body and the pressure differential suspension component is 6mm.

[0038] S3, compounding, pressing the core body after particle screening in step S2 to the surface layer through a transfer wheel to ensure that no particles remain on the edge of the product.

[0039] S4. Performing molding, cutting, and packaging steps to obtain the adult incontinence absorbent product, wherein the SAP residue in the edge area of ​​the adult incontinence absorbent product is less than 0.01%.

[0040] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A method for preparing an absorbent product for adult incontinence, characterized in that: The following steps are involved: S1, core preparation, using a negative pressure die wheel to prepare a mixed core of wood pulp fibers and high molecular water-absorbing resin particles according to a predetermined weight ratio; S2, particle screening: Before the core is transferred from the negative pressure die wheel to the surface layer, the core is subjected to dynamic negative pressure screening by a pressure differential suspension component to remove polymer water-absorbing resin particles that are not firmly bonded to the core. The polymer water-absorbing resin particles that are not firmly bonded to the core matrix are separated from the core matrix due to gravity and airflow disturbance. The pressure differential suspension component is located on one side of the negative pressure die wheel; S3, compounding, pressing the core body after particle screening in step S2 onto the surface layer through a transfer wheel to ensure that no particles remain on the edge of the product; S4, performing forming, cutting and packaging steps to obtain the adult incontinence absorbent product.

2. The method for preparing an absorbent product for adult incontinence according to claim 1, characterized in that: In step S1, the mass ratio of the polymer water-absorbing resin particles to the core matrix is ​​greater than 0.

6.

3. The method for preparing an absorbent product for adult incontinence according to claim 1, characterized in that: In step S3, the composite process uses a low-disturbance transfer wheel for pressing to avoid damage to the core structure and secondary shedding of the polymer water-absorbing resin particles.

4. The method for preparing an absorbent product for adult incontinence according to claim 1, wherein: The SAP residual content in the edge region of the adult incontinence absorbent article is less than 0.01%.

5. The method for preparing an absorbent product for adult incontinence according to claim 1, characterized in that: The pressure difference suspension component includes a negative pressure chamber, conveying rollers arranged on both sides of the negative pressure chamber and a conveyor belt connecting the two conveying rollers. The conveyor belt is provided with a plurality of inclined holes, and the inclined direction of each inclined hole is downward or upward.

6. The method for preparing an absorbent product for adult incontinence according to claim 5, characterized in that: The negative pressure chamber has a side close to the negative pressure die wheel with long strip air outlets spaced apart along the width direction of the conveyor belt, and each of the inclined holes is correspondingly arranged to each of the air outlets.

7. The method for preparing an absorbent product for adult incontinence according to claim 1, characterized in that: In step S2, the negative pressure value of the pressure differential suspension component is ≥-500 Pa, and the time for the core to pass through the pressure differential suspension component is at least 3 seconds.

8. The method for preparing an absorbent product for adult incontinence according to claim 7, characterized in that: The core body and the pressure differential suspension component are spaced apart by a distance of 2 mm to 10 mm.

9. The method for preparing an absorbent product for adult incontinence according to claim 1, characterized in that: In step S2, the detached polymer water-absorbing resin particles are collected and recovered in real time by the collecting component at the bottom of the pressure difference suspension component to achieve in-situ reuse. The collecting component includes a porous collecting plate, a collecting chamber arranged below the porous collecting plate, and a pneumatic conveying pipe connected to the bottom of the collecting chamber.

10. The method for preparing an absorbent product for adult incontinence according to claim 9, characterized in that: The negative pressure value in the pneumatic conveying pipeline is maintained at -1kPa to -5kPa to ensure that the detached high molecular water-absorbing resin particles are efficiently conveyed to the front negative pressure mold wheel to prepare the mixed core body.

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