A flow guide groove hot pressing device and its application method in the preparation of paper diapers

Abstract

The present application relates to a kind of flow guide groove hot-pressing device and its application method on paper diaper preparation, it relates to the technical field of sanitary products, including the following steps: top layer nonwoven fabric enters flow guide groove hot-pressing device, and form flow guide groove on top layer nonwoven fabric upper surface, the flow guide groove hot-pressing device includes input shell and output shell, transmission shaft is bolted in input shell and output shell, installation ring is fixed in input shell and output shell, heat conduction structure is installed between installation ring, steam supply structure is installed in input shell, and flow guide structure is installed in steam supply structure;The preparation method of the paper diaper with flow guide groove, heat exchange occurs inside by heat conduction ring and heat insulation ring and high-temperature steam, and then heat conduction ring is heated to hot-pressing mould, subsequently by the influence of the arc surface of heat conduction ring inner wall and the centrifugal force generated by device rotation, make cold water flow to the inner wall of heat insulation ring, and then flow to the space between separation baffle and flow guide plate along flow guide fan blade.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, specifically to a flow channel hot pressing device and its application method in the preparation of diapers. Background Technology

[0002] The instantaneous absorbency and dryness of diapers mainly depend on the hydrophilicity of the surface nonwoven fabric and the SAP distribution of the absorbent core. To improve the longitudinal diffusion speed of urine and reduce side leakage, some diapers have added independent drainage channels on the surface nonwoven fabric or absorbent core. Currently, the hot pressing method is mainly used in industrial production to form drainage channels on the absorbent core of diapers. This method applies pressure and heat to the core material through heated embossing rollers to shape the fluff pulp fibers and form stable drainage channels.

[0003] In the existing diaper distribution channels, high-temperature steam is generally introduced into the hot-pressing roller during the hot-pressing process to heat the roller. At the same time, the high temperature and high pressure cause the fluff pulp fibers to undergo plastic deformation and finally fix their shape. However, during the process of heating the hot-pressing roller with high-temperature steam, condensation water easily forms on the inner wall of the hot-pressing roller. Affected by the centrifugal force generated by the rotation of the hot-pressing roller, the condensation water easily forms a heat insulation film composed of condensation water on the arc-shaped inner wall of the hot-pressing roller, which in turn affects the temperature of the hot-pressing roller. As a result, the temperature of fluff pulp fiber deformation is insufficient, resulting in defective products. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a guide groove hot pressing device and its application method in the production of diapers, so as to solve the problem that the heat insulation film composed of condensate is easily formed in the hot pressing roller of the prior art, which affects the heating of the hot pressing roller and leads to defective products.

[0005] This invention is achieved through the following technical solution:

[0006] This invention provides a hot pressing device for a flow guide channel, comprising an input housing and an output housing. A drive shaft is bolted to the input housing and the output housing. An installation ring is fixed inside both the input housing and the output housing. A heat-conducting structure is installed between the installation rings. A steam conveying structure is installed inside the input housing, and a flow guide structure is installed inside the steam conveying structure.

[0007] The heat-conducting structure includes a heat-conducting ring installed between the input housing and the output housing. The heat-conducting ring is made of metal. A heat-insulating ring is installed inside the heat-conducting ring. A gas separator is provided between the heat-insulating ring and the heat-conducting ring. Multiple equidistant hot pressing molds are installed in the circumferential direction of the outer contour of the heat-conducting ring.

[0008] The flow guiding structure includes an inner sealing tube mounted on a drive shaft. A circumferentially arrayed partition baffle and flow guiding plate are mounted on the outer contour of the inner sealing tube. A corresponding circumferentially arrayed outer sealing plate is mounted on the partition baffle and flow guiding plate. Flow guiding fan blades are mounted on the outer sealing plate.

[0009] Preferably, the inner side of the heat-conducting ring is an arc-shaped surface, the transition between the inner arc-shaped surface of the heat insulation ring and the heat-conducting ring is smooth, and the heat-conducting ring and the heat insulation ring are in a sealed state.

[0010] Preferably, the partition baffle is parallel to the axis of the drive shaft, and the guide plate is inclined along the outer contour of the inner sealing tube.

[0011] Preferably, a sealing ring is installed on one side of the inner sealing tube, and a discharge ring is installed on the other side of the inner sealing tube. The discharge ring has a through groove corresponding to the partition baffle and the guide plate.

[0012] Preferably, the two sides of the guide fan blade are respectively mounted on the sealing ring and the discharge ring, the upper surface of the guide fan blade is aligned with the edge of the outer sealing plate, and the end of the guide fan blade away from the inner sealing tube is adapted to the heat conduction ring and the heat insulation ring.

[0013] Preferably, a central return pipe connected to the discharge ring is installed on one side of the discharge ring. The central return pipe is mounted on the drive shaft, and a drain pipe is installed on the central return pipe. The drain pipe penetrates the output housing.

[0014] Preferably, the steam transmission structure includes an input sealing cover installed on both sides of the heat-conducting ring near the input housing and an output sealing cover near the output housing. The input sealing cover and the output sealing cover, together with the transmission shaft and the heat-conducting structure, form a sealed environment.

[0015] Preferably, a uniform air intake pipe is installed through the input sealing cover, and the uniform air intake pipe penetrates the input outer shell.

[0016] Preferably, a heat exchange assembly is installed on the input sealing cover. The heat exchange assembly includes an annular heat exchange tube that communicates with the sealing environment inside the input sealing cover. The annular heat exchange tube has a connecting hole that corresponds to the misalignment of the guide fan blades. A piston plate is installed in the connecting hole of the annular heat exchange tube. A sliding piston is slidably connected in the piston plate. A pressure spring is arranged around the sliding piston between the sliding piston and the annular heat exchange tube.

[0017] A method for applying a flow channel hot-pressing device in the manufacture of diapers, comprising the following steps:

[0018] S1. The top layer of hydrophilic nonwoven fabric is continuously unwound, and hot melt adhesive is evenly sprayed onto its lower surface.

[0019] S2. The top layer of non-woven fabric enters the hot pressing device of the guide channel to form a guide channel on the upper surface of the top layer of non-woven fabric.

[0020] S3. Fold the top layer of non-woven fabric upwards on both sides, apply leg elastic bands, and then press it inwards to bond it, forming a leak-proof three-dimensional protective barrier with elastic closure.

[0021] S4. The top layer of non-woven fabric with diversion channels and three-dimensional protective barriers is sequentially laminated with the absorbent core and breathable bottom film. After applying waist tape, it is cut and folded to obtain the finished diaper.

[0022] The manufacturing method of this diaper with a guide channel involves heat exchange between a heat-conducting ring and a heat-insulating ring and high-temperature steam inside the device. The heat-conducting ring then heats the hot-pressing mold. Because a gas separator is placed between the heat-conducting ring and the heat-insulating ring, the temperature of the heat-conducting ring is lower than that of the heat-insulating ring. This ensures that condensate only forms on the inner wall of the heat-conducting ring. The arc-shaped surface of the inner wall of the heat-conducting ring and the centrifugal force generated by the rotation of the device cause the condensate to flow against the current to the inner wall of the heat-insulating ring, and then along the guide fan blades to the spacer baffle and guide plate, preventing the condensate from affecting the heating process. Simultaneously, steam is discharged outward along the same path, accelerating the discharge of condensate and preventing backflow. Furthermore, the guide plate and heat-conducting structure divide the sealed environment into multiple independent environments. Heat exchange components balance the air pressure in these independent environments, achieving temperature balance and ensuring stable temperatures across all hot-pressing molds with minimal temperature differences.

[0023] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structural connection of the present invention;

[0025] Figure 2 This is an exploded view of the structure of the present invention;

[0026] Figure 3 This is a cross-sectional view of the heat-conducting structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the internal connections of the structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the steam transmission structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the connection portion of the heat exchange component of the present invention;

[0030] Figure 7 This is a schematic diagram of the flow guiding structure connection of the present invention;

[0031] Figure 8 This is an exploded view of the flow guiding structure of the present invention;

[0032] Figure 9 This is a schematic diagram of the central return pipe connection of the present invention;

[0033] In the diagram: 1. Input casing; 2. Output casing;

[0034] 3. Thermally conductive structure; 31. Thermally conductive ring; 32. Thermal insulation ring; 33. Hot pressing mold;

[0035] 4. Mounting ring; 5. Drive shaft;

[0036] 6. Steam transmission structure; 61. Inlet sealing cover; 62. Outlet sealing cover; 63. Uniform air inlet pipe;

[0037] 64. Heat exchange assembly; 641. Annular heat exchange tube; 642. Sliding piston; 643. Pressure spring; 644. Piston plate;

[0038] 7. Flow guiding structure; 71. Sealing ring; 72. Inner sealing tube; 73. Dividing baffle; 74. Flow guide plate; 75. Outer sealing plate; 76. Discharge ring; 77. Flow guide fan blade; 78. Central return pipe; 79. Drain pipe. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0044] This invention provides a method for applying a flow channel hot-pressing device in the manufacture of diapers, comprising the following steps:

[0045] S1. The top layer of hydrophilic nonwoven fabric is continuously unwound, and hot melt adhesive is evenly sprayed onto its lower surface.

[0046] S2. The top layer of non-woven fabric enters the hot pressing device of the guide channel to form a guide channel on the upper surface of the top layer of non-woven fabric.

[0047] S3. Fold the top layer of non-woven fabric upwards on both sides, apply leg elastic bands, and then press it inwards to bond it, forming a leak-proof three-dimensional protective barrier with elastic closure.

[0048] S4. The top layer of non-woven fabric with diversion channels and three-dimensional protective barriers is sequentially laminated with the absorbent core and breathable bottom film. After applying waist tape, it is cut and folded to obtain the finished diaper.

[0049] Please see Figures 1 to 9 The guide channel hot pressing device includes an input housing 1 and an output housing 2. A drive shaft 5 is bolted inside the input housing 1 and the output housing 2. A mounting ring 4 is fixed inside both the input housing 1 and the output housing 2. A heat-conducting structure 3 is installed between the mounting rings 4. A steam conveying structure 6 is installed inside the input housing 1. A guide structure 7 is installed inside the steam conveying structure 6.

[0050] The heat-conducting structure 3 includes a heat-conducting ring 31 installed between the input housing 1 and the output housing 2. The heat-conducting ring 31 is made of metal. A heat-insulating ring 32 is installed inside the heat-conducting ring 31. A gas barrier is provided between the heat-insulating ring 32 and the heat-conducting ring 31. Multiple equidistant hot press molds 33 are installed in the circumferential direction of the outer contour of the heat-conducting ring 31.

[0051] The flow guiding structure 7 includes an inner sealing tube 72 mounted on the drive shaft 5. A circumferentially arrayed partition baffle 73 and a flow guiding plate 74 are mounted on the outer contour of the inner sealing tube 72. A corresponding circumferentially arrayed outer sealing plate 75 is mounted on the partition baffle 73 and the flow guiding plate 74. A flow guiding fan blade 77 is mounted on the outer sealing plate 75.

[0052] Using the above method, the external motor drives the drive shaft 5 to rotate, thereby driving the entire device to rotate. High-temperature steam is input into the device through the steam supply structure 6 to heat the heat-conducting structure 3. Due to the centrifugal force generated by the rotation and the inner contour arc surface of the heat-conducting ring 31 and the heat-insulating ring 32, and because the thermal conductivity of metal is greater than that of air, the condensate generated by the high-temperature steam during the heating of the hot press mold 33 preferentially adheres to the inner contour of the heat-conducting ring 31. Subsequently, under the action of centrifugal force, it accumulates on the inner wall of the heat-insulating ring 32. As the device rotates, the accumulated condensate flows along the guide fan blade 77 into the spacer baffle 73 and the guide plate 74.

[0053] Because the condensate is affected by both gravity and centrifugal force, it cannot flow entirely along the guide fan blades 77. However, the remaining condensate still accumulates on the inner wall of the heat insulation ring 32, thus avoiding affecting the heating of the hot press mold 33 by the steam.

[0054] When condensate enters between the partition baffle 73 and the guide plate 74, as the device rotates, the condensate flows outward along the guide plate 74. At the same time, the path of condensate discharge is also the path of high-temperature steam discharge, which accelerates the discharge of condensate and avoids backflow, so as to prevent the high-temperature steam from being affected by the heat insulation film formed by condensate during the heating of the hot press mold 33.

[0055] Please see Figure 2 and Figure 3 The inner side of the heat-conducting ring 31 is an arc-shaped surface, and the transition between the heat insulation ring 32 and the inner arc-shaped surface of the heat-conducting ring 31 is smooth, and the heat-conducting ring 31 and the heat insulation ring 32 are in a sealed state.

[0056] Using the above method, since the thermal conductivity of metal is higher than that of gas, the heat exchange between the inside and outside of the integral heat-conducting ring 31 and the hot-pressing mold 33 is carried out simultaneously. A gas barrier is set between the heat insulation ring 32 and the heat-conducting ring 31, so that the temperature of the heat insulation ring 32 is higher than that of the heat-conducting ring 31. Therefore, when condensate condenses, it is more likely to condense on the inner wall of the heat-conducting ring 31. Then, through the arc-shaped surfaces of the heat-conducting ring 31 and the heat insulation ring 32, the condensate quickly slides to the inner wall of the heat insulation ring 32 after it forms. At the same time, it is difficult to flow back due to the influence of centrifugal force. Therefore, a condensate insulation film cannot be formed on the inner wall of the heat-conducting ring 31, thus ensuring the temperature stability of the heat-conducting ring 31 and the hot-pressing mold 33.

[0057] Please see Figures 7 to 9The partition baffle 73 is parallel to the axis of the drive shaft 5, and the guide plate 74 is inclined along the outer contour of the inner sealing tube 72.

[0058] A sealing ring 71 is installed on one side of the inner sealing tube 72, and a discharge ring 76 is installed on the other side of the inner sealing tube 72. A through groove is opened on the discharge ring 76 corresponding to the partition baffle 73 and the guide plate 74.

[0059] The two sides of the guide fan blade 77 are respectively installed on the sealing ring 71 and the discharge ring 76. The upper surface of the guide fan blade 77 is aligned with the edge of the outer sealing plate 75. The end of the guide fan blade 77 away from the inner sealing tube 72 is adapted to the heat conduction ring 31 and the heat insulation ring 32.

[0060] A central return pipe 78 connected to the discharge ring 76 is installed on one side of the discharge ring 76. The central return pipe 78 is installed on the drive shaft 5. A drain pipe 79 is installed on the central return pipe 78. The drain pipe 79 penetrates the output housing 2.

[0061] Using the above method, through the cooperation of the guide fan blade 77 and the heat conduction structure 3, as the device rotates, the condensate flows along the guide fan blade 77 to the spacer baffle 73 and the guide plate 74. At the same time, the high-temperature steam in the guide structure 7 also flows along the gap between the outer sealing plates 75 to the spacer baffle 73 and the guide plate 74, promoting the flow of condensate and preventing backflow. Then, the condensate and steam are discharged simultaneously through the discharge ring 76, the central return pipe 78 and the drain pipe 79, avoiding the condensate from affecting the heating effect.

[0062] Please see Figures 4 to 6 The steam transmission structure 6 includes an input sealing cover 61 installed on both sides of the heat-conducting ring 31 near the input housing 1 and an output sealing cover 62 near the output housing 2. The input sealing cover 61 and the output sealing cover 62, together with the transmission shaft 5 and the heat-conducting structure 3, form a sealed environment.

[0063] A uniform air intake pipe 63 is installed through the input sealing cover 61, and the uniform air intake pipe 63 penetrates the input outer casing 1.

[0064] A heat exchange assembly 64 is installed on the input sealing cover 61. The heat exchange assembly 64 includes an annular heat exchange tube 641 that communicates with the sealed environment inside the input sealing cover 61. The annular heat exchange tube 641 has a communication hole that corresponds to the misalignment of the guide fan blade 77. A piston plate 644 is installed in the communication hole of the annular heat exchange tube 641. A sliding piston 642 is slidably connected in the piston plate 644. A pressure spring 643 is arranged around the sliding piston 642 between the sliding piston 642 and the annular heat exchange tube 641.

[0065] By sealing both sides of the heat-conducting ring 31, the high-temperature steam entering it is utilized with maximum efficiency. At the same time, due to the cooperation between the guide fan blade 77 and the heat-conducting structure 3, the sealed environment is divided into six independent environments. The heat exchange component 64 is connected to each independent environment. The sliding piston 642 is pushed by air pressure to equalize the air pressure in each independent environment. Since the high-temperature steam is evenly introduced into each independent environment through the uniform air inlet pipe 63, the air pressure and temperature in each independent environment are positively correlated. While balancing the air pressure, gas exchange is carried out through the annular heat exchange pipe 641 to achieve the purpose of balancing the temperature, thereby ensuring that the temperature of all hot pressing molds 33 is stable and uniform.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flow channel hot pressing device, comprising an input housing (1) and an output housing (2), wherein a drive shaft (5) is bolted to the input housing (1) and the output housing (2), and mounting rings (4) are fixed inside both the input housing (1) and the output housing (2), a heat-conducting structure (3) is installed between the mounting rings (4), a steam conveying structure (6) is installed inside the input housing (1), and a flow guiding structure (7) is installed inside the steam conveying structure (6), characterized in that: The heat-conducting structure (3) includes a heat-conducting ring (31) installed between the input housing (1) and the output housing (2). The heat-conducting ring (31) is made of metal. A heat-insulating ring (32) is installed inside the heat-conducting ring (31). A gas barrier is provided between the heat-insulating ring (32) and the heat-conducting ring (31). Multiple equidistant hot press molds (33) are installed in the circumferential direction of the outer contour of the heat-conducting ring (31). The flow guiding structure (7) includes an inner sealing tube (72) mounted on a drive shaft (5). The outer contour of the inner sealing tube (72) is equipped with a circumferentially arrayed partition baffle (73) and a flow guiding plate (74). The partition baffle (73) and the flow guiding plate (74) are equipped with corresponding circumferentially arrayed outer sealing plates (75). The outer sealing plate (75) is equipped with a flow guiding fan blade (77). The partition baffle (73) is parallel to the axis of the drive shaft (5), and the guide plate (74) is inclined along the outer contour of the inner sealing tube (72); A sealing ring (71) is installed on one side of the inner sealing tube (72), and a discharge ring (76) is installed on the other side of the inner sealing tube (72). A through groove is provided on the discharge ring (76) corresponding to the partition baffle (73) and the guide plate (74). The two sides of the guide fan blade (77) are respectively installed on the sealing ring (71) and the discharge ring (76). The upper surface of the guide fan blade (77) is aligned with the edge of the outer sealing plate (75). The end of the guide fan blade (77) away from the inner sealing tube (72) is adapted to the heat conduction ring (31) and the heat insulation ring (32). The inner side of the heat-conducting ring (31) is an arc-shaped surface, and the transition between the inner arc-shaped surface of the heat insulation ring (32) and the heat-conducting ring (31) is smooth. The heat-conducting ring (31) and the heat insulation ring (32) are in a sealed state.

2. The hot pressing device for the guide channel according to claim 1, characterized in that: A central return pipe (78) connected to the discharge ring (76) is installed on one side of the discharge ring (76). The central return pipe (78) is installed on the drive shaft (5). A drain pipe (79) is installed on the central return pipe (78). The drain pipe (79) penetrates the output housing (2).

3. The hot pressing device for the guide channel according to claim 1, characterized in that: The steam transmission structure (6) includes an input sealing cover (61) installed on both sides of the heat-conducting ring (31) near the input housing (1) and an output sealing cover (62) near the output housing (2). The input sealing cover (61) and the output sealing cover (62) together with the transmission shaft (5) and the heat-conducting structure (3) form a sealed environment.

4. The hot pressing device for the guide channel according to claim 3, characterized in that: A uniform air intake pipe (63) is installed through the input sealing cover (61), and the uniform air intake pipe (63) penetrates the input outer shell (1).

5. The hot pressing device for the guide channel according to claim 4, characterized in that: A heat exchange assembly (64) is installed on the input sealing cover (61). The heat exchange assembly (64) includes an annular heat exchange tube (641) that is connected to the sealed environment inside the input sealing cover (61). The annular heat exchange tube (641) has a connecting hole that corresponds to the misalignment of the guide fan blade (77). A piston plate (644) is installed in the connecting hole of the annular heat exchange tube (641). A sliding piston (642) is slidably connected in the piston plate (644). A pressure spring (643) is arranged around the sliding piston (642) between the sliding piston (642) and the annular heat exchange tube (641).

6. A method for applying a flow channel hot-pressing device in the manufacture of diapers, comprising using the flow channel hot-pressing device as described in any one of claims 1 to 5, characterized in that: Includes the following steps: S1. The top layer of hydrophilic nonwoven fabric is continuously unwound, and hot melt adhesive is evenly sprayed onto its lower surface. S2. The top layer of non-woven fabric enters the hot pressing device of the guide channel to form a guide channel on the upper surface of the top layer of non-woven fabric. S3. Fold the top layer of non-woven fabric upwards on both sides, apply leg elastic bands, and then press it inwards to bond it, forming a leak-proof three-dimensional protective barrier with elastic closure. S4. The top layer of non-woven fabric with diversion channels and three-dimensional protective barriers is sequentially laminated with the absorbent core and breathable bottom film. After applying waist tape, it is cut and folded to obtain the finished diaper.

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