A paper diaper core body forming device

Abstract

This invention relates to the field of hygiene product manufacturing equipment, specifically to a diaper core forming device, comprising a frame, an upper conveying unit and a lower conveying unit, a feeding unit, a gluing unit, and a hot-pressing welding unit. At the rear end of the feeding unit, at the lower conveying unit, a forming unit is arranged on the frame for folding the lower surface layer inwards on both sides laterally. Each forming unit includes guide folding assemblies arranged on both sides of the lower surface layer. Each guide folding assembly includes a base plate parallel to the lower surface layer, an outer longitudinal plate perpendicular to the base plate, a first inclined guide plate fixed to the upper edge of the outer longitudinal plate, a second inclined guide plate fixed to the end of the first inclined guide plate, and a third inclined guide plate fixed to the end of the second inclined guide plate. The opening between the second and third inclined guide plates gradually decreases from the input end of the lower surface layer. This invention solves the problem of insufficient applicability of existing core forming devices.

Description

Technical Field

[0001] This invention relates to the field of hygiene product manufacturing equipment, specifically to a diaper core forming device. Background Technology

[0002] The existing diaper core molding process, as shown in Chinese patent application CN 115381631 A, includes a core structure comprising an upper surface layer, an upper superabsorbent polymer (SAP) layer, an intermediate fixing layer, a lower SAP layer, and a lower surface layer. The upper surface layer is connected to the top of the intermediate fixing layer, and the lower surface layer is connected to the bottom of the intermediate fixing layer. The upper SAP layer, located at the bottom of the upper surface layer, is connected to the top of the intermediate fixing layer, and the lower SAP layer, located at the top of the lower surface layer, is connected to the bottom of the intermediate fixing layer. Hot melt adhesive is applied between the upper surface layer and the upper SAP layer, and hot melt adhesive is applied between the lower SAP layer and the lower surface layer. The absorbent core is often a layered structure, bonded using hot melt adhesive. The forming process is as follows: 1) The upper surface layer is formed by mixing and combing the two fiber layers in proportion through a carding and web forming device 1, and then entering the drying oven device 1 for hot air piercing and reinforcement; 2) The middle fixing layer is formed by mixing and combing the two fiber layers in proportion through a carding and web forming device 2, and then entering the drying oven device 2 for hot air reinforcement; 3) The middle fixing layer obtained in 2) above is transferred to the high water absorbent resin feeding device 1 and the high water absorbent resin feeding device 2, and a high water absorbent resin layer is applied; 4) The lower surface layer is transferred to the gluing device 1 through an unwinding device to apply hot melt adhesive 2, and after gluing, it is combined with the above 3) and reinforced by pressure. 5) The material after pressure reinforcement in 4) above is transferred to the superabsorbent resin feeding device three and the superabsorbent resin feeding device three, and a superabsorbent resin layer is applied; 6) The upper surface layer formed in 1) above is transferred to the adhesive application device two to apply hot melt adhesive one, and after adhesive application, it is combined with the material obtained in 5) above and pressure reinforced to finally form a thin absorbent core; 7) The material in 6) above is transferred to the winding device for winding.

[0003] In production, superabsorbent resin mixed with fluff pulp and other materials are used to obtain the absorbent material. The upper, lower and middle layers of the supporting material are fed with the corresponding absorbent material, and then transferred, compounded and pressurized to form the absorbent core product.

[0004] However, the current equipment used for core molding can only produce cores with the aforementioned multi-layered structure. In the hygiene products industry, the requirements for different product types are changing with the evolving living standards, and the equipment is no longer sufficient to meet the production needs of some new products, resulting in insufficient applicability. Summary of the Invention

[0005] Therefore, the present invention provides a diaper core forming device, which solves the problem of insufficient applicability of existing core forming devices.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: A diaper core forming apparatus includes a frame, wherein the frame is provided with an upper conveying unit and a lower conveying unit for conveying an upper surface layer and a lower surface layer in an assembly line. A feeding unit for applying liquid-absorbing material to the lower surface layer conveyed by the lower conveying unit; A glue application unit used for applying glue to the upper and lower surface layers; A hot-press welding unit for bonding the upper and lower surface layers together is provided. The frame at the lower conveying unit at the rear end of the feeding unit is equipped with a forming unit for pressing the lower surface layer inward on both sides laterally. The forming unit includes guide folding assemblies arranged on both sides laterally of the lower surface layer. Each guide folding assembly includes a base plate distributed parallel to the lower surface layer, an outer longitudinal plate distributed perpendicular to the base plate, a first inclined guide plate fixed to the upper edge of the outer longitudinal plate, a second inclined guide plate fixed to the end of the first inclined guide plate, and a third inclined guide plate fixed to the end of the second inclined guide plate. The opening between the second and third inclined guide plates gradually decreases from the input end of the lower surface layer.

[0007] Preferably, the first inclined guide plate, the second inclined guide plate, and the outer longitudinal plate are all hinged together. The first inclined guide plate has a waist-shaped hole in the middle, and an adjusting rod for adjusting the angle of the first inclined guide plate and supporting the second inclined guide plate passes through the waist-shaped hole.

[0008] Preferably, an adsorption groove is provided between the two guide folding components, and the width of the adsorption groove is smaller than the width of the lower surface layer.

[0009] Preferably, both the upper conveying unit and the lower conveying unit include an unwinding roller, a receiving unit, a storage unit, and a correction mechanism.

[0010] Preferably, the feeding unit includes an SAP adding device and a cotton forming device arranged in sequence.

[0011] Preferably, the feeding unit includes a cotton forming device and an SAP adding device arranged in sequence.

[0012] Preferably, the feeding unit is a forming die wheel mechanism for feeding the SAP and the liquid-absorbing sheet after mixing.

[0013] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: This technical solution employs a multi-layered guide folding assembly. During production, when the guide folding assembly acts on both sides of the lower surface layer, the first and second inclined guide plates form the required folds. Then, through the gradually decreasing openings of the third and second inclined guide plates, the height of the folded positions on both sides of the core gradually decreases until the folded positions fit together, entering the composite process between the lower and upper surface layers. This process allows the transverse sides of the lower surface layer, which is covered with absorbent material, to be folded as needed to form the required transverse cross-section. The resulting diaper core forms a concave groove structure in the center, and the connection between the two sides is achieved by the upper... Factors such as the width of the surface layer, whether it is folded under the packaging, the adhesive application structure, and the composition of the internal core material all influence the expansion space of the core material created by the concave groove structure. The folded positions on both sides form liquid-blocking and liquid-absorbing walls in the thickness direction after the liquid enters, ensuring the absorption of the liquid. This multi-layer structure, based on the traditional multi-layer core structure, forms longitudinal spaces on both sides of the lateral side. Different materials can be filled inside according to needs, and different material ratios can be applied to achieve different functions. It forms a structure that is different from traditional multi-layer composite materials, has good applicability, and can meet the current production needs for multi-functional composite cores. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall process structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the guide folding assembly structure in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the positional distribution structure of the molding unit in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the overall process structure of Embodiment 2 of the present invention.

[0015] Reference numerals: m, upper surface layer; n, lower surface layer; 100, upper conveying unit; 200, lower conveying unit; 300, unloading unit; 300a, SAP adding device; 300b, cotton forming device; 400, gluing unit; 500, hot pressing welding unit; 600, forming unit; 601, first inclined guide plate; 602, second inclined guide plate; 603, third inclined guide plate; 604, outer longitudinal plate; 605, bottom plate; 606, waist-shaped hole; 700, adsorption tank. Detailed Implementation

[0016] The following will describe in detail the implementation of the present invention with reference to specific embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Example 1

[0017] refer to Figures 1 to 3A diaper core forming device includes a frame, wherein the frame is provided with an upper conveying unit 100 and a lower conveying unit 200 for conveying an upper surface layer m and a lower surface layer n in an assembly line. A feeding unit 300 for applying liquid-absorbing material to the lower surface layer n conveyed by the lower conveying unit 200; The adhesive application unit 400 is used for applying adhesive to the upper surface layer m and the lower surface layer n. The adhesive application unit 400 is either spiral adhesive application or spray adhesive application. Here, spray adhesive application is used for ease of structural arrangement. A hot-press welding unit 500 is used to bond the upper surface layer m and the lower surface layer n together. A forming unit 600 for pressing the lower surface layer n inward on both sides of the lateral direction is arranged on the frame of the lower conveying unit 200 at the rear end of the unloading unit 300. The forming unit 600 includes guide folding assemblies arranged on both sides of the lower surface layer n. Each guide folding assembly includes a base plate 605 distributed parallel to the lower surface layer n, an outer longitudinal plate 604 distributed perpendicular to the base plate 605, a first inclined guide plate 601 fixed to the upper edge of the outer longitudinal plate 604, a second inclined guide plate 602 fixed to the end of the first inclined guide plate 601, and a third inclined guide plate 603 fixed to the end of the second inclined guide plate 602. The opening between the second inclined guide plate 602 and the third inclined guide plate 603 gradually decreases from the input end of the lower surface layer n.

[0018] Unlike traditional folding mechanisms in sanitary product manufacturing, the guide folding assembly operates on sheet-like production line material with absorbent material. Therefore, the length of the guide folding assembly should not be too long to avoid large-area displacement of the absorbent material after it is originally glued to the lower surface layer n. Thus, its length needs to be less than 35 cm. Furthermore, since it is formed by pressing and folding on a production line with absorbent material, an adsorption groove 700 is arranged at the forming position, i.e., between the two guide folding assemblies. The width of the adsorption groove 700 is smaller than the width of the lower surface layer n. This allows for a certain extendable end in the unadsorbed area of ​​the adsorption groove 700, which is beneficial to the function of the guide folding assembly. In contrast, the traditional guide roller structure with full lateral coverage has greater limitations on the material of the lower surface layer n, requiring a longer production line length and making it more prone to material damage during internal pressure folding.

[0019] Specifically, both the upper conveying unit 100 and the lower conveying unit 200 include an unwinding roller, a receiving unit, a storage unit, and a correction mechanism; all of the above mechanisms are conventional equipment in the field and can be purchased commercially, and will not be described in detail here.

[0020] Structurally, the feeding unit 300 is a forming mold wheel mechanism for feeding the SAP mixed with absorbent sheet. SAP refers to superabsorbent polymer (SAP), a commonly used absorbent material in the hygiene products industry. The absorbent sheet is a product of pulp or wood pulp after being crushed, also known as fluff pulp. The specific structure of the forming mold wheel mechanism is shown in the prior application CN 215459345 U by an affiliated company of the applicant, and will not be elaborated upon here. Furthermore, the feeding unit 300 should shorten the feeding width during feeding, reducing the amount of absorbent material at the guiding folding assembly's operational position, i.e., at the lateral edges of the lower surface layer n, to facilitate folding and prevent or reduce the amount of absorbent material falling out of the lower surface layer n during folding.

[0021] This technical solution employs a multi-layered guide folding assembly. During production, when the guide folding assembly acts on both sides of the lower surface layer n, the first inclined guide plate 601 and the second inclined guide plate 602 form the required folds. Then, through the gradually decreasing openings of the third inclined guide plate 603 and the second inclined guide plate 602, the height of the folded positions on both sides of the core gradually decreases until the folded positions fit together, entering the composite process between the lower surface layer n and the upper surface layer m. This process allows the lateral sides of the lower surface layer n, which is covered with absorbent material, to be folded as needed to form the required lateral cross-section. The resulting diaper core has a concave groove structure in the center. The connection on both sides is affected by factors such as the width of the upper surface layer m, whether it is folded and wrapped, the adhesive structure, and the composition of the internal core material. The concave groove structure can form an expansion space for the core material, and the folded positions on both sides form a liquid-blocking and liquid-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 side based on the traditional multi-layer structure core. Different materials can be filled inside according to the needs, and different material ratios can be applied to achieve different functions, forming a structure different from traditional multi-layer composite materials. It has good applicability and can meet the current production needs for multi-functional composite cores.

[0022] Structurally, the first inclined guide plate 601, the second inclined guide plate 602, and the outer longitudinal plate 604 are all hinged. The first inclined guide plate 601 has a waist-shaped hole 606 in the middle, and an adjusting rod for adjusting the angle of the first inclined guide plate 601 and supporting the second inclined guide plate 602 passes through the waist-shaped hole 606. In this structure, the lower end of the adjusting rod is screwed to the base plate 605, so the adjusting rod can be rotated to change the height of the contact point of the second inclined guide plate 602, thereby adjusting the opening between the second inclined guide plate 602 and the first inclined guide plate 601 to meet the guiding and folding requirements of different products and models, improving the practicality of this structure. During adjustment, the retraction structure of the waist-shaped hole 606 facilitates the rotation of the first inclined guide plate 601. The hinge structure described above can be made of a suitable hinge to fix the corresponding guide plate structure. Example 2

[0023] refer to Figure 4 Compared to Embodiment 1, the feeding unit 300 includes a cotton forming device 300b and a SAP adding device 300a arranged sequentially. This structure allows the feeding unit 300 to feed the cotton forming device 300b and the SAP adding device 300a separately, so that the absorbent and fast-diffusion wood pulp and paper pulp are arranged separately from the water-locking SAP material. This allows for adjustments to the layering position and lateral position of the two materials according to requirements, making it suitable for the production of products with different properties. For example, in sanitary napkin products, when rapid absorption is required, the fluff pulp covers the surface of the SAP to achieve rapid absorption and diversion, and then locks in the water. Correspondingly, the positions of the two can also be interchanged, that is, the feeding unit 300 is set to include SAP adding device 300a and cotton forming device 300b arranged in sequence, and then the stacked structure can be selected according to the requirements. Furthermore, a feeding trough with spaced feeding openings can be provided at the discharge ends of the SAP adding device 300a and the cotton forming device 300b, so that the feeding arrangement of the cotton forming device 300b and the SAP adding device 300a is spaced out, and the two are staggered in the core to form a single layer with distinct distribution areas of different absorbent materials, thereby realizing the production of different core structures.

[0024] The SAP addition device 300a includes a material tank, a feeder, and a discharge controller, while the cotton forming device 300b includes a wood pulp feeding rack, a crusher, and a forming wheel, all of which are well known to those skilled in the art and will not be described in detail here.

[0025] 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 diaper core forming apparatus, comprising a frame, wherein the frame is provided with an upper conveying unit (100) and a lower conveying unit (200) for conveying an upper surface layer (m) and a lower surface layer (n) in an assembly line. A feeding unit (300) for applying liquid-absorbing material to the lower surface layer (n) conveyed by the lower conveying unit (200); A glue application unit (400) for applying glue to the surfaces of the upper surface layer (m) and the lower surface layer (n). A hot-press welding unit (500) for integrally bonding an upper surface layer (m) and a lower surface layer (n) is characterized by: The lower conveying unit (200) at the rear end of the feeding unit (300) is provided with a forming unit (600) for pressing the lower surface layer (n) inward from both sides of the lateral direction. The forming unit (600) includes guide folding assemblies arranged on both sides of the lower surface layer (n). Each guide folding assembly includes a base plate (605) distributed parallel to the lower surface layer (n), an outer longitudinal plate (604) distributed perpendicular to the base plate (605), a first inclined guide plate (601) fixed to the upper edge of the outer longitudinal plate (604), a second inclined guide plate (602) fixed to the end of the first inclined guide plate (601), and a third inclined guide plate (603) fixed to the end of the second inclined guide plate (602). The opening between the second inclined guide plate (602) and the third inclined guide plate (603) gradually decreases from the input end of the lower surface layer (n). An adsorption groove (700) is provided between the two guide folding components, the width of the adsorption groove (700) being smaller than the width of the lower surface layer (n).

2. The diaper core forming device according to claim 1, characterized in that: The first inclined guide plate (601), the second inclined guide plate (602) and the outer longitudinal plate (604) are all hinged together. The first inclined guide plate (601) has a waist-shaped hole (606) in the middle. An adjusting rod for adjusting the angle of the first inclined guide plate (601) and supporting the second inclined guide plate (602) is inserted into the waist-shaped hole (606).

3. The diaper core forming device according to claim 1, characterized in that: The upper conveying unit (100) and the lower conveying unit (200) both include an unwinding roller, a receiving unit, a storage unit, and a correction mechanism.

4. The diaper core forming device according to claim 1, characterized in that: The feeding unit (300) includes an SAP adding device (300a) and a cotton forming device (300b) arranged in sequence.

5. The diaper core forming device according to claim 1, characterized in that: The feeding unit (300) includes a cotton forming device (300b) and an SAP adding device (300a) arranged in sequence.

6. The diaper core forming device according to claim 1, characterized in that: The feeding unit (300) is a forming mold wheel mechanism for feeding the SAP and the liquid-absorbing sheet after mixing.

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