Molding system

Abstract

The embodiment of the application provides a forming system, which comprises a crushing device, a forming box, a supporting net and a suction box. The crushing device comprises a first space, the first space comprises a toothed roller and a first channel, the first channel comprises an air inlet and a discharge port, the discharge port is arranged on a bottom plate, the bottom plate is adjacent to one side of the toothed roller, and a partition plate extending into the first space is further arranged on the bottom plate, and the area of the discharge port is greater than that of the air inlet. The forming box comprises a forming cavity, the forming cavity is communicated with the first channel, the forming cavity comprises a scattering port with an area greater than that of the discharge port, and the scattering port is used for stacking fibers on the supporting net to form a core. The suction box is used for making the airflow in the first space and the forming cavity flow to the direction of the supporting net. By arranging the partition plate, the airflow can be guided on one hand, and the airflow form at the first channel can be isolated on the other hand, the airflow in the forming cavity is stable, the fiber distribution of the formed core is uniform, and the absorption performance is improved.

Description

Technical Field

[0001] This invention relates to a molding system, and more particularly to a molding system for forming the core of absorbent articles. Background Technology

[0002] In disposable absorbent products, the core is the main absorbent carrier of the liquid. The core includes a network structure made of absorbent fibers and superabsorbent polymer (SAP) disposed in or on the surface of the network structure.

[0003] For the molding of the core of disposable absorbent products such as mattresses, a molding device is widely used, as shown in document CN212640792U, entitled "Molding Device for Absorbent Core of Disposable Nursing Pad". This molding device includes a crusher, a molding box, a support net, and an adsorption box. The fluff pulp moves in the molding box under the action of airflow and accumulates on the support net to form the core. The molding box includes a box-shaped structure formed by side plates, which has an inlet, a distribution port, and a molding cavity located between the inlet and the distribution port. The distribution port of the box-shaped structure is larger than the inlet, making the entire box-shaped structure trapezoidal. At the same time, an air inlet is opened on the side plate. A crusher is set above the inlet, and the fibers after being de-fibrinated by the crusher enter the molding cavity from the inlet. A crusher air inlet is set above the crusher.

[0004] In practice, it has been found that due to the complex airflow movement inside the molding cavity, there is always a problem of uneven fiber distribution in the current molding system. In particular, the fiber distribution density or unevenness of the core is difficult to distinguish on the surface and is also difficult to detect directly. However, it is easily manifested during absorption, that is, the area with more fiber distribution shows a higher absorption rate. Therefore, this problem of uneven fiber distribution in the core has always plagued the industry.

[0005] Therefore, a solution needs to be developed and implemented to address the aforementioned technical problems. Summary of the Invention

[0006] Therefore, the present invention provides a molding system to solve the above-mentioned technical problems.

[0007] A molding system includes a crushing device, a molding box, a support net, and an adsorption box; The crushing device includes a first space enclosed by a shell. The first space includes a toothed roller and a first channel disposed on one side of the toothed roller. The first channel includes an air inlet and a material outlet. The shell includes a bottom plate, a top plate, and an upper side plate connected to the top plate and the bottom plate. The material outlet is disposed on the bottom plate. The bottom plate is also provided with an isolation plate extending into the first space on the side adjacent to the toothed roller. The area of ​​the material outlet is larger than that of the air inlet. The molding box includes a molding cavity, which is connected to the first channel, and the molding cavity includes a distributing port with an area larger than the discharge port. The distributing port is used to stack fibers on the support net to form a core. The adsorption box is located below the support net and connected to the negative pressure device to allow the airflow in the first space and the forming cavity to flow towards the support net.

[0008] The isolation plate is perpendicular to the bottom plate, and one side of the isolation plate extends to the inner wall of the discharge port.

[0009] There is a gap between the isolation plate and the toothed roller. If the width of the gap is d1 and the height of the isolation plate is d2, then d1:d2 = 1:0.7 to 1:1.

[0010] The top plate is provided with an upper extension, which includes an upper rear plate and an upper plate. The air inlet is located on the upper plate, and the partition plate is flush with the upper rear plate.

[0011] The air inlet is positioned directly opposite the material outlet.

[0012] The molding box includes a connecting part and a molding part. The molding part includes a molding cavity formed by a back plate, a front air supply plate spaced apart from the back plate, and a pair of lower side plates connecting the back plate and the front air supply plate. The height of the connecting part is greater than or equal to 200mm, and the ratio of the height of the connecting part to the height of the molding part is between 1:4 and 2:5. At the same time, the included angle between the front air supply plate and the distribution port is between 35° and 42°.

[0013] The front air supply plate includes a first area adjacent to the connecting part and a second area adjacent to the distribution port. Air supply holes are provided only in the second area. The area of ​​the first area is greater than or equal to 35% and less than or equal to 50% of the area of ​​the front air supply plate. Meanwhile, the area of ​​the air supply holes accounts for 25% to 65% of the area of ​​the second area.

[0014] The upper side plate includes an upper front plate, and the forming part includes a middle front plate, wherein the upper front plate and the middle front plate are flush.

[0015] The height of the isolation plate is greater than or equal to 4cm, and the distance between the isolation plate and the rotation axis of the toothed roller is greater than or equal to 10cm.

[0016] Beneficial Effects: This invention provides a molding system including a crushing device, a molding box, a support net, and an adsorption box. The crushing device includes a first space enclosed by a shell, the first space including a toothed roller and a first channel disposed on one side of the toothed roller. The first channel includes an air inlet and a material outlet. The shell includes a bottom plate, the material outlet is disposed on the bottom plate, and an isolation plate extending into the first space is also disposed on the side of the bottom plate adjacent to the toothed roller. The area of ​​the material outlet is larger than that of the air inlet. The molding box includes a molding cavity communicating with the first channel. The molding cavity includes a distribution port with an area larger than that of the material outlet. The distribution port is used to stack fibers on the support net to form a core. The adsorption box is disposed below the support net and connected to a negative pressure device to allow the airflow in the first space and the molding cavity to flow towards the support net. By setting the isolation plate, the airflow can be guided on the one hand, and the airflow pattern at the first channel can be isolated on the other hand, thus stabilizing the airflow in the molding cavity. Ultimately, the core fibers are evenly distributed, and the absorption performance is improved. Attached Figure Description

[0017] Figure 1 Schematic diagram of the molding system of the present invention; Figure 2 for Figure 1 Schematic diagram of section II; Figure 3 for Figure 2 Airflow density cloud map below the profile; Figures 4-5 Vector diagram of airflow velocity at different rotational speeds of the toothed roller; Figures 6-7 Airflow velocity contour maps at different rotational speeds of the toothed roller; Figure 8 Air pressure cloud map.

[0018] Component descriptions in the diagram: Crushing device 10; First space 100; Area A 1001; Area B 1002; Shell 101; Upper front plate 102; Upper plate 103; Upper rear plate 104; First channel 11; Air inlet 111; Discharge outlet 112; Toothed roller 12; Bottom plate 13; Isolation plate 131; Forming box 20; Forming cavity 200; Connecting part 21; Middle front plate 211; Forming part 22; Back plate 221; Rear air supply hole 2211; Front air supply plate 222; Front air supply hole 2221; Distribution port 223; Lower side plate 224; Side air supply hole 2241; Adsorption box 30. Detailed Implementation

[0019] Please refer to Figure 1 and Figure 2The present invention provides a molding system to solve the technical problem of uneven fiber distribution in the core in the prior art, and provides a molding system with relatively stable airflow and uniform fiber distribution in the core.

[0020] The molding system includes a crushing device 10, a molding box 20, a support net, and an adsorption box 30.

[0021] The crushing device 10 is used to disperse the fibers of the fluff pulp board into discrete fibers. Specifically, the crushing device 10 includes a first space 100 surrounded by a housing 101. The first space 100 includes a toothed roller 12 and a first channel 11 disposed on one side of the toothed roller 12. The first channel 11 includes an air inlet 111 and a material outlet 112.

[0022] The housing 101 includes a top plate, a bottom plate 13, and an upper side plate connecting the top plate and the bottom plate 13. The air inlet 111 is disposed on the top plate, and the discharge port 112 is disposed on the bottom plate 13. The air inlet 111 and the discharge port 112 are directly opposite each other. The term "directly opposite" means that the air inlet 111 is located directly above the discharge port 112. At the same time, the area of ​​the discharge port 112 is larger than that of the air inlet 111.

[0023] Understandably, the housing 101 is also provided with a feed inlet, through which the fluff pulp board enters the first space 100. The toothed roller 12 is provided with a plurality of teeth along its circumference. When the toothed roller 12 rotates, the teeth crush and disperse the fluff pulp board that contacts the teeth. At the same time, the crushing device 10 also includes a power device for driving the toothed roller 12 to rotate and a transmission device connecting the power device and the toothed roller 12. Understandably, the power device can be an electric motor, and the transmission device can be a belt drive or a gear drive.

[0024] Understandably, the feed inlet is located on the side opposite to the first channel 11. Meanwhile, in this embodiment, the toothed roller 12 rotates clockwise so that when the airflow moves from the air inlet to the outlet 112, the fibers crushed and dispersed by the toothed roller 12 enter the first channel 11 and enter the forming cavity 200 with the airflow.

[0025] The base plate 13 is also provided with an isolation plate 131 extending into the first space 100. Specifically, the base plate 13 includes a first side facing the toothed roller 12 and a second side facing away from the toothed roller 12. One end of the isolation plate 131 is fixed to the first side, and the other end extends into the first space 100. In this embodiment, the isolation plate 131 is perpendicular to the base plate 13 and divides the upper space of the base plate 13 into area A 1001 and area B 1002. It can be understood that area A 1001 is located directly below the toothed roller 12, and area B 1002 is part of the first channel 11.

[0026] It is understood that the discharge port 112 is located on one side of the isolation plate 131, and the side of the isolation plate 131 extends to the side wall of the discharge port 112. That is, there is no bottom plate 13 to block the side of the isolation plate 131 facing the discharge port 112, and the airflow flows along the extension direction of the isolation plate. The bottom plate 13 and the isolation plate 131 are L-shaped.

[0027] Please refer to this as well. Figure 6 , Figure 7 and Figure 8 ,exist Figure 6 and Figure 7 The diagram shows the airflow velocity contours of the toothed roller 12 at different rotational speeds. Figure 8 The airflow pressure cloud diagram is shown, and based on practical experience, by setting up a baffle plate 131 at the discharge port 112, the following three functions are achieved: 1. The airflow is guided through the first channel 11 and into the forming cavity 200. In particular, during the high-speed movement of the toothed roller 12, the high-speed airflow can be guided to flow along the extension direction of the partition plate 131. Second, when the toothed roller 12 is not moving at high speed, most of the airflow will move from the air inlet to the discharge outlet 112. However, during the rotation of the toothed roller 12, some airflow will be carried into the direction of the feed inlet along with the rotation of the toothed roller 12, which can easily cause fibers or airflow to be released from the feed inlet, resulting in a large amount of dust. After the isolation plate 131 is set, this part of the airflow is isolated, which greatly reduces the problem of unexpected dust at the feed inlet. III. Please refer to Figure 8 Due to the effect of the isolation plate 131, a high-pressure zone is formed in area A 1001, but the airflow pressure is uniform in area B 1002 and the entire cross-section of the first channel 11. This means that the isolation plate 131 effectively isolates the high-pressure zone. Figure 6 and Figure 7 It can also be seen that the baffle plate 131 keeps the airflow on the cross-section of the first channel 11 stable, thereby forming a uniform core, especially in Figure 8 It can be clearly seen that the pressure distribution is uniform across the entire support mesh surface. Further practice has proven that when the isolation plate 131 is set, the overall absorption performance of the core is improved by an average of more than 4%. In particular, when the molding system needs to move at high speed, such as when producing a thicker core, the average absorption performance of the core is improved by more than 8.7% by setting the isolation plate 131.

[0028] Furthermore, there is a gap between the isolation plate 131 and the toothed roller 12. If the width of the gap is d1 and the height of the isolation plate 131 is d2, then d1:d2 = 1:0.7 to 1:1. Within this range, the isolation plate 131 can guide the airflow and isolate the airflow between area A 1001 and area B 1002 without delaying or causing airflow turbulence to the adjacent toothed roller 12.

[0029] Furthermore, the height of the isolation plate 131 is greater than or equal to 4cm, and the distance between the isolation plate 131 and the rotation axis of the toothed roller 12 is greater than or equal to 10cm.

[0030] Furthermore, an upper extension is provided on the upper side of the top plate. The extension includes an upper rear plate 104 and an upper plate 103. The air inlet 111 is located on the upper plate 103. The partition plate 131 is approximately flush with the upper rear plate 104. It can be seen that since the area of ​​the air inlet 111 is smaller than that of the discharge port 112, and the air inlet 111 and the discharge port 112 are directly opposite each other, a accommodating space is formed between the upper plate 103, the top plate, and the upper front plate 102 in the first channel 11. During the airflow movement, this space forms an airflow buffer so that the airflow from the air inlet 111 to the discharge port 112 can be stably laminar.

[0031] The forming box 20 is located directly below the crushing device 10 and includes a connecting part 21 and a forming part 22. The connecting part 21 forms a conveying channel. The fibers formed by crushing and dispersing are carried by the airflow through the connecting part 21 into the forming part 22. In this embodiment, the connecting part 21 is a straight cylindrical shape with a rectangular cross-section.

[0032] The connecting part 21 includes an upper opening and a lower opening, wherein the upper opening is connected to the discharge port 112 and the lower opening is used to connect to the forming part 22.

[0033] The forming part 22 is located below the connecting part 21 and includes a forming cavity 200 formed by a back plate 221, a front air supply plate 222 spaced apart from the back plate 221, and a pair of lower side plates 224 connecting the back plate 221 and the front air supply plate 222. The upper end of the forming cavity 200 is connected to the conveying channel, and the lower side of the forming cavity 200 includes a distributing port 223 for distributing the fibers in the forming cavity 200 through the distributing port 223 onto the support net (not shown) or the web (not shown) to form the core.

[0034] Below the distributing port 223, an adsorption box 30 is also provided. The adsorption box 30 includes an adsorption port opposite to the distributing port 223. The adsorption box 30 is connected to a negative pressure device to form a negative pressure in the area between the distributing port 223 and the adsorption port, so that the airflow in the first channel 11, the conveying channel and the forming cavity 200 moves from top to bottom. At the same time, the fiber and other materials in the forming cavity 200 move from the forming cavity 200 to the adsorption port along with the airflow, and are accumulated on the support net or web by the interception of the support net or web to form a core.

[0035] The front air supply plate 222 and the back plate 221 are arranged opposite to each other and are inclined, so that the molding box 20 presents a frustum shape with a larger bottom and a smaller top.

[0036] A plurality of front air supply holes 2221 are provided on the front air supply plate 222 so that some airflow can enter the molding cavity 200 through the front air supply holes 2221 for airflow balance.

[0037] Further research revealed that as the airflow moves from the inlet to the distribution port 223, the cross-section of the path increases sequentially. Simultaneously, due to the compression effect of the rotating toothed roller 12 on the airflow, a portion of the high-speed / high-pressure airflow significantly impacts the airflow in the forming cavity 200 as it moves downwards. The influence of this portion of the airflow within the forming cavity 200 should be reduced; at the very least, the high-speed or high-pressure airflow should not extend to the distribution port 223. Please refer to this as well. Figure 3 , Figure 4 and Figure 5 ,exist Figures 3-5 The diagram illustrates the movement pattern and extension location of this high-speed or high-pressure airflow. The study also found that when the height of the connecting portion 21 is within a suitable range, and when the height of the connecting portion 21 and the height of the forming portion 22 are within a suitable range, the tail end of this high-speed / high-pressure airflow will have no or negligible impact on the core forming process. Figures 3-5 This situation is illustrated, which makes the fiber distribution on the web uniform during the core forming process.

[0038] Specifically, the height of the connecting part 21 is greater than or equal to 200mm, the ratio of the height of the connecting part 21 to the height of the forming part 22 is between 1:4 and 2:5, and the included angle between the front air supply plate 222 and the distribution port 223 is between 35° and 42°.

[0039] In addition, the front air supply plate 222 includes a first area adjacent to the connecting part 21 and a second area adjacent to the distribution port 223. Air supply holes are provided only in the second area. The area of ​​the first area is greater than or equal to 35% and less than or equal to 50% of the area of ​​the front air supply plate 222. At the same time, the area of ​​the air supply holes accounts for 25%-65% of the area of ​​the second area, so that the front air supply plate 222 can provide appropriate air supply in the corresponding area without interfering with the internal airflow.

[0040] Furthermore, the back plate 221 is provided with a rear air supply hole 2211 and the lower side plate 224 is provided with a side air supply hole 2241.

[0041] Furthermore, the upper side plate includes an upper front plate 102, and the forming part 22 includes a middle front plate 211. The upper front plate 102 and the middle front plate 211 are flush, and the front air supply plate is inclined to the middle front plate 211. This allows the airflow to actually enter the forming cavity 200 through the first channel and the conveying channel, but actually be located in the middle of the forming cavity 200. This allows the airflow to carry the fibers to the forming cavity 200, thereby increasing the space and reducing the pressure to form a better mixing effect. At the same time, it can be evenly laid on the support net.

[0042] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A molding system, comprising a crushing device, a molding box, a support net, and an adsorption box, characterized in that, The crushing device includes a first space enclosed by a shell. The first space includes a toothed roller and a first channel disposed on one side of the toothed roller. The first channel includes an air inlet and a material outlet. The shell includes a bottom plate, a top plate, and an upper side plate connected to the top plate and the bottom plate. The material outlet is disposed on the bottom plate, and the bottom plate is provided with an isolation plate extending into the first space. The bottom plate and the isolation plate are L-shaped, and the area of ​​the material outlet is larger than that of the air inlet. The molding box includes a molding cavity, which is connected to the first channel, and the molding cavity includes a distributing port with an area larger than the discharge port. The distributing port is used to stack fibers on the support net to form a core. The adsorption box is located below the support net and connected to the negative pressure device to allow the airflow in the first space and the forming cavity to flow towards the support net.

2. The molding system as described in claim 1, characterized in that, The isolation plate is perpendicular to the bottom plate, and one side of the isolation plate extends to the inner wall of the discharge port.

3. The molding system as described in claim 1, characterized in that, There is a gap between the isolation plate and the toothed roller. If the width of the gap is d1 and the height of the isolation plate is d2, then d1:d2 = 1:0.7 to 1:

1.

4. The molding system as described in claim 3, characterized in that, The top plate is also provided with an upper extension, which includes an upper rear plate and an upper plate. The air inlet is located on the upper plate, and the partition plate is flush with the upper rear plate.

5. The molding system as described in claim 4, characterized in that, The air inlet is positioned directly opposite the material outlet.

6. The molding system as described in claim 5, characterized in that, The molding box includes a connecting part and a molding part. The molding part includes a molding cavity formed by a back plate, a front air supply plate spaced apart from the back plate, and a pair of lower side plates connecting the back plate and the front air supply plate. The height of the connecting part is greater than or equal to 200mm, and the ratio of the height of the connecting part to the height of the molding part is between 1:4 and 2:

5. At the same time, the included angle between the front air supply plate and the distribution port is between 35° and 42°.

7. The molding system as described in claim 6, characterized in that, The front air supply plate includes a first zone adjacent to the connecting part and a second zone adjacent to the distribution port. Air supply holes are provided only in the second zone. The area of ​​the first zone is greater than or equal to 35% and less than or equal to 50% of the area of ​​the front air supply plate. Meanwhile, the area of ​​the air supply holes accounts for 25% to 65% of the area of ​​the second zone.

8. The molding system as described in claim 7, characterized in that, The upper side panel includes an upper front panel, and the forming part includes a middle front panel, with the upper front panel and the middle front panel being flush.

9. The molding system as described in claim 8, characterized in that, The height of the isolation plate is greater than or equal to 4cm, and the distance between the isolation plate and the rotation axis of the toothed roller is greater than or equal to 10cm.

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