A bubble isolation and overflow constant liquid level control device and method for high bubble wet wipe production

Abstract

The application discloses a bubble-isolating and overflow constant liquid level control device and method for high-bubble wet tissue production, which comprises a processing box, first and second groove bodies are fixedly connected to the two sides of the inner bottom wall of the processing box, a liquid feeding pipe is arranged on one side of the inner side wall of the processing box and located directly above the first groove body, a communication pipe for communicating the first and second groove bodies is arranged at the bottom end of the side of the first groove body close to the second groove body, a bubble-blocking filter screen is arranged in the communication pipe, an overflow weir is arranged on one side of the outer side wall of the second groove body and communicated with the second groove body (3), and a backflow pipe is arranged on one side of the outer side wall of the second groove body and communicated with the overflow weir; the first and second groove bodies, the liquid feeding pipe, the communication pipe, the bubble-blocking filter screen, the overflow weir and the backflow pipe are arranged, so that the consistency of the substrate wetting liquid content and the subsequent product white sheet wet weight is improved.

Description

Technical Field

[0001] This invention relates to the field of wet wipe production equipment technology, specifically to a bubble isolation and overflow constant liquid level control device and method for the production of high-foam wet wipes. Background Technology

[0002] In the continuous production process of wet wipes, the substrate needs to be transported to the liquid addition station. The substrate absorbs the corresponding liquid through immersion, and after immersion, some liquid is squeezed out through the water pressure structure so that the substrate reaches the set wet weight. For functional wet wipes such as shoe wipes, kitchen wipes and down jacket wipes, the liquid used usually contains surfactants. The liquid is prone to generating a lot of foam during transportation, falling and production cycle disturbance, and the amount of foam will vary due to factors such as temperature, flow rate and liquid disturbance. Existing wet wipe wetting and liquid addition stations typically use a single tank to receive the liquid and supply it for substrate wetting. When a lot of foam is generated in the tank, the foam layer occupies the internal space of the tank, causing changes in the liquid level in the actual liquid phase area of ​​the tank. As the foam is generated and dissipates, the actual liquid level will also fluctuate, making it difficult to maintain a stable wetting depth of the substrate continuously passing through the tank and the amount of liquid absorbed during the wetting process. Even if the pressure and gap of the subsequent water pressing structure are kept consistent, the initial liquid content of the substrate before entering the water pressing station may still be different, which will cause fluctuations in the wet weight of the finished white sheet and affect the consistency of the liquid content of the product during continuous production. Summary of the Invention

[0003] To address the shortcomings of existing technologies, where the actual liquid level fluctuates with the generation and dissipation of foam, making it difficult to maintain a stable immersion depth of the substrate passing through the tank and the amount of liquid absorbed during immersion, and even if the pressure and gap of the subsequent water-pressing structure remain consistent, the initial liquid content of the substrate before entering the water-pressing station may still differ, resulting in fluctuations in the wet weight of the finished white sheets and affecting the consistency of the liquid content of the product during continuous production, this invention provides a foam isolation and overflow constant liquid level control device and method for the production of high-foam wet wipes.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A bubble-isolating and overflow constant liquid level control device for the production of high-foam wet wipes includes a processing box, wherein a first tank and a second tank are fixedly connected to both sides of the bottom wall of the processing box, and a liquid inlet pipe with its liquid outlet located directly above the first tank is provided on one side of the inner wall of the processing box. The bottom end of the first tank near the second tank is provided with a connecting pipe for connecting the first tank and the second tank. A bubble-blocking filter is provided inside the connecting pipe. An overflow weir connected to the second tank is provided on one side of the outer wall of the second tank. A return pipe connected to the overflow weir is provided on one side of the outer wall of the second tank.

[0005] As a preferred embodiment of the present invention, the processing box is provided with a guide roller assembly, which includes a first immersion roller and a second immersion roller rotatably connected to the bottom ends of the inner walls of the first tank and the second tank respectively, and a transition guide roller rotatably connected above the area between the first tank and the second tank.

[0006] As a preferred embodiment of the present invention, an output roller is rotatably connected above the outlet side of the second tank inside the processing box.

[0007] As a preferred embodiment of the present invention, a water pressure roller assembly is provided on the inner side wall of the processing box near the output roller, the water pressure roller assembly including an upper water pressure roller and a lower water pressure roller.

[0008] As a preferred embodiment of the present invention, the first immersion roller, the transition guide roller, and the second immersion roller are arranged sequentially along the substrate conveying direction, and the substrate passes around the first immersion roller, the transition guide roller, and the second immersion roller in sequence.

[0009] A method for foam isolation and overflow constant liquid level control in the production of high-foam wet wipes includes the following steps: S1, supplying liquid to generate foam, injecting the high-foam solution into the first tank through the liquid addition pipe, so that the foam generated by the high-foam solution gathers above the liquid surface of the first tank. S2, bubble-blocking mass transfer and connection balance, so that the liquid in the lower part of the first tank flows into the second tank through the connecting pipe and the bubble-blocking filter screen. The bubble-blocking filter screen blocks the foam and air bubbles flowing with the liquid and keeps the lower parts of the first tank and the second tank in liquid connection. S3, overflow height control and linkage constant liquid, continuously supply high foaming liquid into the first tank, so that the liquid in the lower part of the first tank is continuously replenished into the second tank through the connecting pipe. When the liquid level in the second tank reaches the height of the overflow weir, the excess liquid is discharged through the overflow weir into the return pipe, so that the liquid level in the second tank is maintained at the preset wetting liquid level. S4. Immersion and extrusion: The substrate is guided by the guide roller group to pass through the first immersion roller, the transition guide roller and the second immersion roller in sequence, and the immersion substrate is then discharged through the discharge roller and squeezed and controlled by the water pressure roller group.

[0010] As a preferred embodiment of the present invention, in step S4, the pressure and gap between the upper and lower pressure rollers are adjusted according to the target wet weight of the substrate to adjust the liquid content of the substrate after extrusion.

[0011] As a preferred embodiment of the present invention, the liquid discharged through the return pipe and the liquid squeezed out by the pressure roller group are respectively returned to the liquid preparation system for recycling.

[0012] In summary, this application has the following beneficial effects: 1. This invention, through the arrangement of a first tank, a second tank, a liquid inlet pipe, a connecting pipe, a bubble-blocking filter, an overflow weir, and a return pipe, allows the high-foaming solution to enter the first tank via the liquid inlet pipe. The resulting foam can accumulate above the liquid surface in the first tank. The liquid below the foam layer can flow to the second tank via the connecting pipe located at the bottom of the first tank. The bubble-blocking filter further blocks the foam and air bubbles flowing with the liquid. When the liquid level in the second tank reaches the opening height of the overflow weir, the excess liquid can enter the return pipe through the overflow weir and be discharged. Thus, by concentrating the foam in the first tank, transferring the lower liquid phase between the two tanks, and overflowing at a fixed height in the second tank, the influence of changes in the amount of foam in the first tank on the working liquid level of the second tank is reduced, allowing the second tank to maintain a relatively stable wetting liquid level. This is beneficial for improving the wetting liquid content of the substrate and the consistency of the wet weight of the finished white film. 2. This invention, through the continuous coordination of liquid supply for foaming, foam separation and mass transfer and connection balance, overflow height control and linkage constant liquid and immersion extrusion, enables the supply of high-foaming liquid, foam concentration, lower liquid phase transfer, fixed-height overflow of the second tank, continuous immersion of the substrate and extrusion liquid control to be carried out in a corresponding sequence. The liquid discharged through the return pipe and the liquid squeezed out by the water pressure roller group are returned to the liquid preparation system for recycling. This is beneficial to maintain the immersion liquid level of the second tank and the liquid content of the substrate after extrusion during continuous production, while reducing the discharge and loss of high-foaming liquid. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural schematic diagram of a bubble isolation and overflow constant liquid level control device and method for the production of high-foam wet wipes according to the present invention. Figure 2 This is a top view schematic diagram of the bubble isolation and overflow constant liquid level control device and method for the production of high-foam wet wipes according to the present invention. Figure 3 This is a three-dimensional cross-sectional view of a bubble isolation and overflow constant liquid level control device and method for the production of high-foam wet wipes according to the present invention. Figure 4 This is a side cross-sectional view of the device and method for bubble isolation and overflow constant liquid level control in the production of high-foam wet wipes according to the present invention.

[0014] Explanation of reference numerals in the attached figures: 1. Processing box; 2. First tank; 3. Second tank; 4. Liquid filling pipe; 5. Connecting pipe; 6. Bubble-blocking filter screen; 7. Overflow weir; 8. Return pipe; 9. Guide roller group; 91. First immersion roller; 92. Second immersion roller; 93. Transition guide roller; 94. Outlet roller; 10. Water pressure roller group; 101. Upper water pressure roller; 102. Lower water pressure roller. Detailed Implementation

[0015] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0016] Example: Please refer to Figure 1 , Figure 2 and Figure 3 The present invention discloses a bubble isolation and overflow constant liquid level control device for the production of high-foam wet wipes, comprising a processing box 1, a first tank 2 and a second tank 3 respectively fixedly connected to both sides of the bottom wall of the processing box 1, the processing box 1 being set at the liquid addition and wetting station of a wet wipe continuous production equipment, the first tank 2 and the second tank 3 being arranged sequentially along the interior of the processing box 1, and a liquid addition pipe 4 with the liquid outlet located directly above the first tank 2 being provided on one side of the inner wall of the processing box 1; The liquid filling pipe 4 is used to transport the external high-foaming liquid. The high-foaming liquid is a surfactant-containing liquid used in the production process of wet wipes. When the liquid enters the first tank 2 through the liquid filling pipe 4, the high-foaming liquid generates foam due to the liquid falling, impacting the liquid surface, and the flow disturbance during the production process. The generated foam accumulates above the liquid surface of the first tank 2 because its density is less than that of the liquid. This causes a foam layer to be formed inside the first tank 2 and a liquid phase region to be formed below the foam layer. Both the first tank 2 and the second tank 3 can be made of stainless steel. The substrate can be a double-layer composite nonwoven fabric, such as a composite substrate formed by meltblown fabric and pearl-textured spunlace fabric.

[0017] Reference Figure 2 , Figure 3 and Figure 4 The bottom end of the first tank 2 near the second tank 3 is provided with a connecting pipe 5 for connecting the first tank 2 and the second tank 3. A bubble-blocking filter 6 is provided inside the connecting pipe 5. An overflow weir 7 connected to the second tank 3 is provided on one side of the outer wall of the second tank 3. A return pipe 8 connected to the overflow weir 7 is provided on one side of the outer wall of the second tank 3. The connecting pipe 5 is located in the lower liquid phase region of the first tank 2 and the second tank 3. The two ends of the connecting pipe 5 are connected to the first tank 2 and the second tank 3 respectively, so that the liquid in the first tank 2 located below the foam layer can flow to the second tank 3 through the connecting pipe 5. The connecting pipe 5 can be made with a diameter that can meet the requirements of continuous liquid replenishment, so as to reduce the resistance and liquid replenishment lag generated when the liquid flows from the first tank 2 to the second tank 3. Its actual flow cross section can be determined according to the equipment production speed, liquid supply volume and the required liquid exchange capacity between the two tanks. Since the foam mainly accumulates above the liquid surface in the first tank 2, and the connecting pipe 5 is located at the bottom of the first tank 2 near the second tank 3, when the first tank 2 transfers liquid to the second tank 3, the liquid below the foam layer mainly enters the connecting pipe 5, reducing the amount of macroscopic foam that directly enters the second tank 3 from the liquid flow path. The bubble-blocking filter 6 is located on the liquid flow path of the connecting pipe 5 to further block the foam and air bubbles that flow into the connecting pipe 5 with the liquid. The mesh size of the bubble-blocking filter 6 should be such that it can block the entrained foam and air bubbles without significantly affecting the normal flow of the liquid. It is not required that the bubble-blocking filter 6 completely remove all the air bubbles in the liquid. When the equipment is stationary and the liquid flow is small, the liquid in the first tank 2 and the second tank 3 tends to reach liquid level equilibrium due to the connection relationship. During continuous production, the first tank 2 continuously receives high-foaming liquid and replenishes the second tank 3 through the connecting pipe 5. Thus, the first tank 2 and the second tank 3 form a continuous dynamic liquid exchange relationship. When the liquid level in the second tank 3 is lower than the lower edge of the overflow weir 7, the liquid that enters from the first tank 2 through the connecting pipe 5 remains in the second tank 3. When the liquid is continuously replenished and the liquid level in the second tank 3 reaches the lower edge of the overflow weir 7, the excess liquid exceeding this height enters the return pipe 8 through the overflow weir 7 and is discharged through the return pipe 8, so that the liquid level in the second tank 3 is maintained near the preset wetting liquid level. The end of the return pipe 8 away from the overflow weir 7 can be connected to the liquid distribution system, so that the liquid overflowing from the second tank 3 can be returned to the liquid distribution system through the return pipe 8, thereby recovering the liquid exceeding the preset wetting level of the second tank 3.

[0018] The processing box 1 is equipped with a guide roller group 9. The guide roller group 9 includes a first immersion roller 91 and a second immersion roller 92 that are rotatably connected to the bottom ends between the inner side walls of the first tank 2 and the second tank 3, respectively, and a transition guide roller 93 that is rotatably connected above the area between the first tank 2 and the second tank 3. The first immersion roller 91, the transition guide roller 93, and the second immersion roller 92 are arranged sequentially along the substrate conveying direction. The substrate passes around the first immersion roller 91, the transition guide roller 93, and the second immersion roller 92 in sequence. Under the guidance of the first immersion roller 91, the substrate enters the first tank 2 and enters the second tank 3 after passing the transition guide roller 93. The first immersion roller 91, the transition guide roller 93, and the second immersion roller 92 can rotate with the continuous conveying of the substrate to support and change the direction of the substrate, and make the substrate pass through the first tank 2 and the second tank 3 in sequence according to a preset path.

[0019] Inside the processing box 1, above the outlet side of the second tank 3, there is a rotating guide roller 94. The guide roller 94 is used to change the conveying direction of the substrate after it leaves the second tank 3, so that the substrate that has been wetted can be smoothly conveyed to the subsequent water press station, while reducing the friction and scratching between the substrate and the edge of the outlet side of the second tank 3.

[0020] A water pressure roller group 10 is provided on the inner side wall of the processing box 1 near the output roller 94. The water pressure roller group 10 includes an upper water pressure roller 101 and a lower water pressure roller 102. The upper water pressure roller 101 and the lower water pressure roller 102 are arranged opposite each other. After the substrate is output by the output roller 94, it passes between the upper water pressure roller 101 and the lower water pressure roller 102. The upper water pressure roller 101 and the lower water pressure roller 102 together apply a squeezing action to the substrate that has absorbed the liquid, so as to squeeze out some of the excess liquid carried by the substrate. During continuous production, the pressure and gap between the upper and lower pressure rollers 101 and 102 can be adjusted according to the target wet weight of the white sheet of wet wipes to change the degree of squeezing of the substrate by the pressure roller group 10, so that the liquid content of the substrate after pressing is adapted to the target wet weight of the white sheet. The specific pressure and gap adjustment can adopt the existing pressure roller adjustment method in the wet wipe production equipment. This embodiment does not limit the specific adjustment mechanism. The liquid squeezed out by the pressure roller group 10 can be returned to the liquid distribution system for continued use through the corresponding collection and return pipeline.

[0021] This invention also provides a method for bubble isolation and overflow constant liquid level control in the production of high-foam wet wipes, comprising the following steps: S1. Liquid supply and foaming: The high-foaming solution is injected into the first tank 2 through the liquid supply pipe 4, so that the foam generated by the high-foaming solution gathers above the liquid surface of the first tank 2. In practice, the liquid preparation system continuously supplies high-foaming liquid to the liquid addition pipe 4. The high-foaming liquid enters the first tank 2 from the liquid outlet of the liquid addition pipe 4 and generates foam under the action of liquid falling, impacting the liquid surface and the disturbance of the production process. The generated foam gradually floats up and gathers above the liquid surface of the first tank 2, so that the first tank 2 forms an upper foam layer and a lower liquid phase region. During use, the high-foaming liquid is allowed to form foam normally in the first tank 2, and it is not necessary to actively eliminate the foam by adding defoamer.

[0022] S2, bubble separation, mass transfer and connection balance, so that the liquid in the lower part of the first tank 2 flows into the second tank 3 through the connecting pipe 5 and the bubble-blocking filter 6. The bubble-blocking filter 6 blocks the foam and air bubbles flowing with the liquid and keeps the lower parts of the first tank 2 and the second tank 3 in liquid connection. Since the connecting pipe 5 is located at the bottom of the first tank 2 near the second tank 3, the foam in the first tank 2 mainly gathers above the liquid inlet of the connecting pipe 5. The liquid below the foam layer enters the connecting pipe 5. When the liquid passes through the bubble-blocking filter 6, the bubble-blocking filter 6 blocks the foam and air bubbles flowing with the liquid. Then the liquid enters the second tank 3. The first tank 2 and the second tank 3 are thus connected in the lower liquid. When the equipment is stationary and the liquid flow is small, the liquid levels in the two tanks can tend to be balanced based on the connection relationship. In the continuous production state, the first tank 2 continuously replenishes the liquid to the second tank 3 through the connecting pipe 5.

[0023] S3, overflow height control and linkage constant liquid, continuously supply high foaming liquid into the first tank 2, so that the liquid in the lower part of the first tank 2 is continuously replenished into the second tank 3 through the connecting pipe 5. When the liquid level in the second tank 3 reaches the height of the overflow weir 7, the excess liquid enters the return pipe 8 through the overflow weir 7 and is discharged, so that the liquid level in the second tank 3 is maintained at the preset wetting liquid level. During continuous production, the substrate will continuously carry away a certain amount of the solution. Therefore, the liquid supply pipe 4 continuously supplies high-foaming solution to the first tank 2 and replenishes the liquid consumed by the second tank 3 during the production process through the connecting pipe 5. When the liquid added to the second tank 3 reaches the lower edge of the overflow weir 7, the liquid exceeding this height enters the return pipe 8 through the overflow weir 7 and is discharged, thus forming a liquid level control state that combines continuous liquid replenishment at the bottom with a fixed height overflow. The thickness of the foam layer in the first tank 2 can vary with temperature, flow rate and production disturbance, while the immersion liquid level in the second tank 3 is mainly limited by the opening height of the overflow weir 7, thereby reducing the impact of changes in the amount of foam in the first tank 2 on the actual liquid level in the second tank 3.

[0024] S4. Immersion and extrusion: the substrate is guided by the guide roller group 9 to pass through the first immersion roller 91, the transition guide roller 93 and the second immersion roller 92 in sequence, and the immersion substrate is exported through the export roller 94 and then extruded and controlled by the water pressure roller group 10. In practice, the substrate is continuously conveyed under the traction of the production line. First, it passes around the first immersion roller 91 set in the first tank 2, then changes direction through the transition guide roller 93 above the area between the first tank 2 and the second tank 3, and then passes around the second immersion roller 92 set in the second tank 3, so that the substrate passes through the first tank 2 and the second tank 3 in sequence to complete the immersion. After immersion, the substrate is discharged through the discharge roller 94 and enters between the upper pressure roller 101 and the lower pressure roller 102. Under the squeezing action of the upper pressure roller 101 and the lower pressure roller 102, some of the excess liquid is discharged. Adjust the pressure and gap between the upper and lower water pressure rollers 101 and 102 according to the target wet weight of the substrate to adjust the liquid content of the substrate after extrusion. According to the target wet weight of the white film required by different products, the pressure and gap between the rollers of the water pressure roller group 10 can be adjusted accordingly to change the amount of liquid extruded from the substrate by the water pressure roller group 10, so that the substrate after extrusion reaches the liquid content required by the corresponding product. The liquid discharged through the return pipe 8 and the liquid squeezed out by the pressure roller group 10 are returned to the liquid distribution system for recycling. The liquid entering the return pipe 8 through the overflow weir 7 is returned to the liquid distribution system through the return pipe 8. The liquid squeezed out by the pressure roller group 10 is returned to the liquid distribution system through the corresponding collection return pipe, so that the above liquids can participate in the subsequent liquid distribution cycle again.

[0025] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bubble-isolating and overflow constant liquid level control device for the production of high-foam wet wipes, comprising a processing chamber (1), characterized in that: The bottom wall of the processing box (1) is fixedly connected to the first tank (2) and the second tank (3) respectively. A liquid addition pipe (4) with the liquid outlet located directly above the first tank (2) is provided on one side of the inner wall of the processing box (1). The bottom end of the first tank (2) near the second tank (3) is provided with a connecting pipe (5) for connecting the first tank (2) and the second tank (3). A bubble-blocking filter (6) is provided inside the connecting pipe (5). An overflow weir (7) connected to the second tank (3) is provided on one side of the outer wall of the second tank (3). A return pipe (8) connected to the overflow weir (7) is provided on one side of the outer wall of the second tank (3).

2. The bubble isolation and overflow constant liquid level control device for the production of high-foam wet wipes according to claim 1, characterized in that: The processing box (1) is provided with a guide roller group (9), which includes a first immersion roller (91) and a second immersion roller (92) rotatably connected to the bottom ends of the inner sidewalls of the first tank (2) and the second tank (3), respectively, and a transition guide roller (93) rotatably connected above the area between the first tank (2) and the second tank (3).

3. The bubble isolation and overflow constant liquid level control device for the production of high-foam wet wipes according to claim 2, characterized in that: The processing box (1) is rotatably connected to an output roller (94) located above the outlet side of the second tank (3).

4. The bubble isolation and overflow constant liquid level control device for the production of high-foam wet wipes according to claim 3, characterized in that: A water pressure roller group (10) is provided on the inner side wall of the processing box (1) near the output roller (94). The water pressure roller group (10) includes an upper water pressure roller (101) and a lower water pressure roller (102).

5. The bubble isolation and overflow constant liquid level control device for the production of high-foam wet wipes according to claim 3, characterized in that: The first immersion roller (91), the transition guide roller (93), and the second immersion roller (92) are arranged sequentially along the substrate conveying direction, and the substrate passes around the first immersion roller (91), the transition guide roller (93), and the second immersion roller (92) in sequence.

6. A method for bubble isolation and overflow constant liquid level control in the production of high-foam wet wipes, characterized in that: Includes the following steps: S1. Liquid supply and foaming: The high-foaming solution is injected into the first tank through the liquid supply pipe, so that the foam generated by the high-foaming solution gathers above the liquid surface of the first tank. S2, bubble-blocking mass transfer and connection balance, so that the liquid in the lower part of the first tank flows into the second tank through the connecting pipe and the bubble-blocking filter screen. The bubble-blocking filter screen blocks the foam and air bubbles flowing with the liquid and keeps the lower parts of the first tank and the second tank in liquid connection. S3, overflow height control and linkage constant liquid, continuously supply high foaming liquid into the first tank, so that the liquid in the lower part of the first tank is continuously replenished into the second tank through the connecting pipe. When the liquid level in the second tank reaches the height of the overflow weir, the excess liquid enters the return pipe through the overflow weir and is discharged, so that the liquid level in the second tank is maintained at the preset wetting liquid level. S4. Immersion and extrusion: The substrate is guided by the guide roller group to pass through the first immersion roller, the transition guide roller and the second immersion roller in sequence, and the immersion substrate is then discharged through the discharge roller and squeezed and controlled by the water pressure roller group.

7. The device and method for bubble isolation and overflow constant liquid level control in the production of high-foam wet wipes according to claim 6, characterized in that: In step S4, the pressure and gap between the upper and lower water-pressing rollers are adjusted according to the target wet weight of the substrate to regulate the liquid content of the substrate after extrusion.

8. The device and method for bubble isolation and overflow constant liquid level control in the production of high-foam wet wipes according to claim 6, characterized in that: The liquid discharged through the return pipe and the liquid squeezed out by the pressure roller group are returned to the liquid preparation system for recycling.

Images