Dispersible non-woven fabric manufacturing equipment

Abstract

The embodiment of the invention provides manufacturing equipment for non-woven fabrics capable of being dispersed, which is used for manufacturing the non-woven fabrics capable of being dispersed and comprises a forming unit, the forming unit comprises a headbox and a forming net, the forming net comprises a forming section, the headbox comprises a lip plate, and the lip plate comprises a first upper lip plate and a second upper lip plate. The forming section comprises a first forming section corresponding to the first upper lip plate and a second forming section corresponding to the second upper lip plate, the second upper lip plate is parallel to the second forming section, a first forming area is arranged between the first upper lip plate and the first forming section, and a second forming area is arranged between the second upper lip plate and the second forming section. The second upper lip plate further comprises a micro-pore plate facing the second forming area and an upper cavity located above the micro-pore plate, the micro-pore plate comprises a plurality of micro through holes communicating the upper cavity with the second forming area, and the upper cavity is in a positive pressure state. Furthermore, fish scale lines formed on the wet fiber web by the slurry are reduced, and the product quality is improved and stabilized.

Description

Technical Field

[0001] The invention relates to equipment for manufacturing flushable nonwoven fabrics. Background Art

[0002] In recent years, with the rapid development of the economy, people's pursuit of quality of life has gradually increased, and non-woven products (such as facial masks, face towels, makeup remover towels, wet toilet paper, etc.) have become an important role in daily life. Non-woven fabrics, as a commonly used material for non-woven products on the market, have the advantages of a wide source of raw materials and a soft and fluffy feel. With the increasing awareness of environmental protection, non-woven fabrics are developing in the direction of green and environmental protection, and flushable non-woven fabric materials have come into being.

[0003] Typically, the flushable non-woven fabric is manufactured using manufacturing equipment such as those shown in CN117604802A and CN117988149A. Specifically, it usually includes an inclined mesh former, a hydroentanglement reinforcement device, and a drying device. It is found in practice that when using such a former, full-width fish scale pattern may appear under certain circumstances. These specific conditions include a vehicle speed greater than or equal to 130 m / min, a basis weight greater than or equal to 75 gsm, a thickness greater than or equal to 0.62 mm, and a shaking box decomposition test greater than or equal to 95%. There is currently no better solution.

[0004] Therefore, it is necessary to propose an improved technical solution to solve the above technical problems. Summary of the invention

[0005] To this end, the present invention provides a flushable nonwoven fabric manufacturing device to solve the above technical problems.

[0006] A kind of flushable non-woven fabric manufacturing equipment is used to manufacture flushable non-woven fabric. The flushable non-woven fabric manufacturing equipment includes a molding unit, the molding unit includes a flow box and a molding net, the molding net includes a molding section, the flow box includes a lip plate, the lip plate includes a first upper lip plate and a second upper lip plate arranged in sequence along the slurry flow direction, the molding section includes a first molding section corresponding to the first upper lip plate and a second molding section corresponding to the second upper lip plate, the first upper lip plate is inclined to the first molding section, the second upper lip plate is arranged parallel to the second molding section, a first molding area is included between the first upper lip plate and the first molding section, a second molding area is included between the second upper lip plate and the second molding section, the second upper lip plate also includes a microporous plate facing the second molding area and an upper cavity located above the microporous plate, the microporous plate includes a plurality of micro through holes connecting the upper cavity and the second molding area, and the upper cavity is in a positive pressure state.

[0007] Wherein, the aperture of the micro-through hole is 1-2 mm.

[0008] Wherein, the distribution density of the micro-through holes on the surface of the micro-porous plate is 1 to 4 per cm².

[0009] Among them, the pressure in the upper cavity is 1 to 3 kPa.

[0010] Wherein, the second upper lip plate is pivotally connected to the first upper lip plate and is configured to be adjustable to maintain a parallel state with the second forming section.

[0011] Among them, the forming unit also includes an immersion and adsorption device, which includes an immersion device and an adsorption device. The immersion device includes an immersion tank filled with clean water, and the immersion device is configured to immerse a part of the forming net in the immersion tank. The adsorption device includes a suction box arranged downstream of the immersion device.

[0012] Among them, the forming net immersed in the immersion tank is called the first net segment, the immersion device includes an adjusting roller, the first net segment is wrapped around the adjusting roller, and the adjusting roller is configured to be adjustable so that the first net segment is immersed in clean water or separated from the clean water.

[0013] Wherein, the immersion device includes a swing roller, the forming net includes a second net segment wrapped around the swing roller, the swing roller is linked with the adjusting roller, and when the first net segment moves, the second net segment moves synchronously.

[0014] Wherein, the forming unit also includes a plurality of spray components, the spray components include a first spray pipe and a second spray pipe, the immersion adsorption device is arranged between the first spray pipe and the second spray pipe, the forming unit includes a breast roller, the forming net includes a third net segment located between the breast roller and the first forming segment, and the second spray pipe is configured to spray cleaning water to the third net segment.

[0015] The nonwoven fabric has a basis weight of more than 75 g / m2, a thickness of more than 0.60 mm, and a dispersion rate of more than 95%.

[0016] Beneficial effects: The embodiment of the present invention provides a flushable non-woven fabric manufacturing device for manufacturing a flushable non-woven fabric, the flushable non-woven fabric manufacturing device includes a forming unit, the forming unit includes a flow box and a forming net, the forming net includes a forming section, the flow box includes a lip plate, the lip plate includes a first upper lip plate and a second upper lip plate arranged in sequence along the flow direction of the slurry, the forming section includes a first forming section corresponding to the first upper lip plate and a second forming section corresponding to the second upper lip plate, the first upper lip plate is inclined to the first forming section, the second upper lip plate is arranged parallel to the second forming section, a first forming area is included between the first upper lip plate and the first forming section, a second forming area is included between the second upper lip plate and the second forming section, the second upper lip plate also includes a microporous plate facing the second forming area and an upper cavity located above the microporous plate, the microporous plate includes a plurality of micro-through holes connecting the upper cavity and the second forming area, and the upper cavity is in a positive pressure state, the above arrangement can improve the dehydration capacity of the forming end, thereby reducing the formation of fish scale patterns on the wet fiber web by the slurry, and improving and stabilizing the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a flushable nonwoven fabric manufacturing device according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified schematic diagram of area A; Figure 3 for Figure 1 Actual design drawing of headbox; Figure 4 for Figure 2 Enlarged schematic diagram of area B in the middle; Figure 5 for Figure 2 Schematic diagram of the microplate surface morphology.

[0018] Component Description: A headbox 10; a first upper lip plate 11; a first adjusting device 110; a second upper lip plate 12; a second adjusting device 120; a microporous plate 121; micro-through holes 122; an upper cavity 123; a forming net 20; a first forming section 21; a second forming section 22; a first net section 23; a second net section 24; a third net section 25; a breast roll 31; an adjusting roll 32; a swing roll 33; a washing tank 41; a suction box 42; a first spray pipe 43; a second spray pipe 44; a first negative pressure dehydration box 51; and a second negative pressure dehydration box 52. DETAILED DESCRIPTION

[0019] Please refer to Figure 1 The embodiment of the present invention provides a flushable nonwoven fabric manufacturing device for manufacturing a flushable nonwoven fabric, more specifically, more suitable for manufacturing a flushable nonwoven fabric with a thickness of 30 to 80 g / m 2The nonwoven fabric can be made of a basis weight of 0.35 mm or more, a thickness of 0.35 mm or more, and a dispersion rate of 90% or more in a shaking box decomposition test, especially a nonwoven fabric with a dispersion rate of 75 g / m2 at a vehicle speed of 140 m / min or more. 2 Flushable nonwoven fabrics with a basis weight of 0.10mm or more, a thickness of 0.60mm or more, and a dispersion rate of 95% or more in a shake box decomposition test.

[0020] The flushable nonwoven fabric manufacturing device comprises a forming unit for forming the slurry into a wet fiber web. The wet fiber web is formed into the flushable nonwoven fabric after being hydroentangled and dried.

[0021] The forming unit comprises a headbox 10 and a forming mesh 20. The forming mesh 20 is constructed in an endless ring shape and is supported by a plurality of rollers for movement. The rollers include a breast roll 31 located upstream of the headbox 10. A portion of the forming mesh 20 in the downstream direction of the breast roll 31 is configured to be inclined upward relative to the horizontal direction. The inclined upward section is called a forming section. The headbox 10 applies slurry to the forming section from above, and the slurry is dehydrated and formed into a wet fiber web.

[0022] The headbox 10 includes a lip plate located on the upper side of the forming section. In the present embodiment, the lip plate includes a first upper lip plate 11 and a second upper lip plate 12 sequentially arranged along the slurry flow direction. The forming section includes a first forming section 21 corresponding to the first upper lip plate 11 and a second forming section 22 corresponding to the second upper lip plate 12. A first forming area is formed between the first upper lip plate 11 and the first forming section 21, and a second forming area is formed between the second upper lip plate 12 and the second forming section 22. It can be understood that the headbox 10 also includes a flow area upstream of the first forming area. The slurry flows from the flow area toward the first forming area and the second forming area, and is dehydrated in the first forming section 21 and the second forming section 22 to form a wet fiber web.

[0023] The first upper lip plate 11 is inclined to the first forming section 21, and the distance between the first upper lip plate 11 and the first forming section 21 gradually decreases from the upstream direction to the downstream direction. At the same time, the second upper lip plate 12 is arranged parallel to the second forming section 22. The second upper lip plate 12 also includes a microporous plate 121 facing the second forming area and an upper cavity 123 located above the microporous plate 121. The microporous plate 121 includes a plurality of micro-through holes 122 connecting the upper cavity 123 and the second forming area, and the upper cavity 123 is in a positive pressure state.

[0024] It can be understood that a first negative pressure dewatering box 51 is provided below the forming section, and the slurry is rapidly dehydrated to form a wet fiber web through the water flow of the headbox 10 and the first negative pressure dewatering box 51 .

[0025] Furthermore, the upper cavity 123 should be in a slightly positive pressure state. More specifically, the slightly positive pressure means that the pressure in the upper cavity 123 is 1 to 3 kPa.

[0026] The applicant has found that when preparing high basis weight, high thickness, high dispersion rate and requiring high vehicle speed, rapid dehydration cannot be formed at the end of the forming zone. After the wet fiber web flows out from the lip, a small amount of slurry still flows on the upper side of the wet fiber web. After this part of the slurry continues to be dehydrated, a full-width fish scale pattern is formed on the wet fiber web. In the traditional solution, the dehydration capacity of this area can be increased by increasing the flow rate of the first negative pressure dehydration box 51, that is, increasing the vacuum degree of the first negative pressure dehydration box 51. However, this method still has the following two problems. First, due to the requirements of high basis weight and high thickness, increasing the vacuum degree in the lower layer greatly increases the entire air flow rate, which will reduce the thickness of the wet fiber web, or cannot meet the requirements of basis weight and thickness at the same time, increasing the difficulty of controlling basis weight and thickness. Second, due to the obstruction of the upper lip plate, when the vacuum degree of the lower layer is located at When the air flow rate in the lower layer of the lip area is increased, an airflow inward and downward is likely to appear at the lip, resulting in damage or holes on the surface of the wet fiber web when it exits the lip. When a second upper lip plate 12 parallel to the second forming section 22 is arranged on the rear side of the first upper lip plate 11, and a slight positive pressure is applied to the second upper lip plate 12, on the one hand, when the pulp is located in the second forming area, its dehydration capacity is improved to avoid the pulp from accumulating on the wet fiber web after exiting the lip. On the other hand, the slight positive pressure on the upper side will increase the efficiency of the first negative pressure dehydration box 51 on the lower side. Moreover, since the second upper lip plate 12 is arranged parallel to the second forming section 22, the airflow in this area will move perpendicular to the form of the wet fiber web, further improving the dehydration efficiency. On the third hand, this arrangement can avoid the formation of an airflow inward of the lip at the lip, reducing surface damage.

[0027] Furthermore, the aperture of the micro-through hole 122 is 1 to 2 mm. It is found in practice that when the aperture of the micro-through hole 122 is too small, bubbles are likely to appear at the interface between the lower side of the microporous plate 121 and the slurry, resulting in defects on the surface of the wet fiber web. When the aperture of the micro-through hole 122 is too large, the micro-through hole 122 itself hinders the flow of the slurry or the movement of the wet fiber web or further causes surface damage. In a specific embodiment, the aperture of the micro-through hole 122 is approximately 1.6 mm.

[0028] Furthermore, the distribution density of the micro-through holes 122 on the surface of the micro-porous plate 121 is 1 to 4 per cm².

[0029] Furthermore, the first upper lip plate 11 is adjustable. In this embodiment, the first upper lip plate 11 includes a first adjusting device 110 to adjust the inclination angle of the first upper lip plate 11 to adapt to the forming of different products.

[0030] Furthermore, the second upper lip plate 12 is pivotally connected to the first upper lip plate 11 and is configured to be adjustable to maintain a parallel state with the second forming section 22, so that when the inclination angle of the first upper lip plate 11 changes, the second upper lip plate 12 can maintain a parallel state with the second forming section 22.

[0031] Furthermore, the second upper lip plate 12 includes a second adjusting device 120 to adjust the angle of the second upper lip plate 12 .

[0032] Furthermore, the microporous plate 121 has a length of 100 to 400 mm.

[0033] Furthermore, a second negative pressure dewatering box 52 is provided downstream of the second forming section 22 to further dewater the wet fiber web. In a specific embodiment, the vacuum degree of the second negative pressure dewatering box 52 is less than the vacuum degree of the first negative pressure dewatering box 51 .

[0034] Further research has found that when preparing products with high basis weight, high thickness and high dispersion rate, a higher ratio of wood pulp fibers is required. For example, when the proportion of wood pulp fibers used reaches more than 85%, when the existing spray flushing device is used to flush the forming net 20, the wood pulp fibers are still attached to the forming net 20. In this case, the dehydration capacity of the forming net 20 in the forming section is further insufficient. In this embodiment, the molding unit also includes an immersion and adsorption device for removing the wood pulp fibers attached to the forming net 20, and the immersion and adsorption device includes an immersion device and an adsorption device.

[0035] The immersion device includes an immersion tank 41 filled with clean water. The immersion device is configured to immerse a portion of the forming net 20 in the immersion tank 41 and allow the forming net 20 to be soaked in clean water. For the convenience of description, the forming net 20 immersed in the immersion tank 41 is called the first net segment 23. The adsorption device includes a suction box 42 arranged downstream of the immersion device. The suction box 42 is used for adsorption through the soaked first net segment 23. It can be understood that when soaking with clean water, the wood pulp fibers attached to the forming net 20 are transferred to the immersion tank 41 or combined with the clean water under the action of hydrogen bonds. When passing through the suction box 42, they fall off the forming net 20 together with the clean water. The clean water refers to water without fibers.

[0036] Furthermore, the adsorption device also includes a blowing box (not shown) arranged opposite to the suction box 42 , and the blowing box is used to blow out air flow, and cooperates with the suction box 42 to separate the wood pulp fibers and clean water from the forming mesh 20 .

[0037] Furthermore, the immersion device includes an adjusting roller 32, and the first web segment 23 is wrapped around the adjusting roller 32. The adjusting roller 32 is configured to be adjustable so that the first web segment 23 is immersed in clean water or the first web segment 23 is separated from the clean water. It is found in the study that when producing a lower basis weight, such as a flushable non-woven fabric with a basis weight below 50g / ㎡, it is not necessary to perform an immersion treatment on the first web segment 23, and the corresponding technical indicators can still be met.

[0038] Furthermore, the immersion device includes a swing roller 33, and the forming net 20 includes a second net segment 24 wrapped around the swing roller 33. The swing roller 33 is linked with the adjusting roller 32 so that when the first net segment 23 moves, the second net segment 24 moves synchronously and the tension of the forming net 20 is kept stable.

[0039] Furthermore, the forming unit also includes a plurality of spray components, the spray components include a first spray pipe 43 and a second spray pipe 44, the immersion adsorption device is arranged between the first spray pipe 43 and the second spray pipe 44, the first spray pipe 43 and the second spray pipe 44 are both configured to spray cleaning water onto the forming net 20 to clean the forming net 20, the cleaning water can be clean water or white water, and the white water is water that is recycled after removing fibers in the production process of the dispersible non-woven fabric.

[0040] Furthermore, the forming mesh 20 includes a third mesh segment 25 located between the breast roll 31 and the first forming segment 21, and the second spray pipe 44 is configured to spray cleaning water to the third mesh segment 25. Preferably, the second spray pipe 44 sprays clean water.

[0041] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A flushable nonwoven fabric manufacturing device, used for manufacturing flushable nonwoven fabric, characterized in that: The manufacturing equipment of the flushable non-woven fabric includes a forming unit, the forming unit includes a flow box and a forming net, the forming net includes a forming section, the flow box includes a lip plate, the lip plate includes a first upper lip plate and a second upper lip plate arranged in sequence along the flow direction of the slurry, the forming section includes a first forming section corresponding to the first upper lip plate and a second forming section corresponding to the second upper lip plate, the first upper lip plate is inclined to the first forming section, the second upper lip plate is arranged parallel to the second forming section, a first forming area is included between the first upper lip plate and the first forming section, a second forming area is included between the second upper lip plate and the second forming section, the second upper lip plate also includes a microporous plate facing the second forming area and an upper cavity located above the microporous plate, the microporous plate includes a plurality of micro-through holes connecting the upper cavity and the second forming area, and the upper cavity is in a positive pressure state.

2. The flushable nonwoven fabric manufacturing equipment according to claim 1, characterized in that: The aperture of the micro-through hole is 1-2 mm.

3. The flushable nonwoven fabric manufacturing equipment according to claim 1, characterized in that: The distribution density of the micro-through holes on the surface of the micro-well plate is 1 to 4 per cm².

4. The flushable nonwoven fabric manufacturing equipment according to claim 1, characterized in that: The pressure in the upper cavity is 1 to 3 kPa.

5. The flushable nonwoven fabric manufacturing equipment according to claim 4, characterized in that: The second upper lip plate is pivotally connected to the first upper lip plate and is configured to be adjustable to maintain a parallel state with the second forming section.

6. The flushable nonwoven fabric manufacturing equipment according to claim 1, characterized in that: The forming unit also includes an immersion and adsorption device, which includes an immersion device and an adsorption device. The immersion device includes an immersion tank filled with clean water. The immersion device is configured to immerse a portion of the forming net in the immersion tank. The adsorption device includes a suction box arranged downstream of the immersion device.

7. The flushable nonwoven fabric manufacturing equipment according to claim 6, characterized in that: The forming net immersed in the immersion tank is called the first net segment. The immersion device includes an adjusting roller. The first net segment is wrapped around the adjusting roller. The adjusting roller is configured to be adjustable so that the first net segment is immersed in clean water or separated from the clean water.

8. The flushable nonwoven fabric manufacturing equipment according to claim 7, characterized in that: The immersion device comprises a swing roller, the forming net comprises a second net segment wrapped around the swing roller, the swing roller is linked with the regulating roller, and when the first net segment moves, the second net segment moves synchronously.

9. The flushable nonwoven fabric manufacturing equipment according to claim 8, characterized in that: The forming unit also includes multiple spray components, the spray components include a first spray pipe and a second spray pipe, the immersion adsorption device is arranged between the first spray pipe and the second spray pipe, the forming unit includes a breast roller, the forming net includes a third net segment located between the breast roller and the first forming segment, and the second spray pipe is configured to spray cleaning water to the third net segment.

10. The flushable nonwoven fabric manufacturing equipment according to claim 1, characterized in that: The nonwoven fabric has a g / m 2 Basis weight above 0.60mm, thickness above 0.60mm and dispersion rate greater than or equal to 95%.

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