Dispersible non-woven fabric manufacturing equipment

Abstract

The embodiment of the invention provides a manufacturing device for a non-woven fabric capable of being dispersed, the manufacturing device for the non-woven fabric capable of being dispersed 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 a forming area located between the lip plate and the forming section, and the lip plate and the forming section are arranged on the forming section. An energy dissipation plate is arranged in the forming area, the energy dissipation plate comprises a plate body and a plurality of through holes penetrating through the plate body, the aperture of each through hole is 10-18mm, the aperture ratio of the through holes in the plate body is 35-45%, the plate body comprises an extension direction, the included angle between the extension direction of the plate body and the forming section is 10-25 degrees, and the width of the plate body is 10-25 degrees. The lip plate comprises a tail end located on the downstream portion of the slurry flowing direction, the energy dissipation plate is arranged close to the tail end, through the arrangement, the slurry flow stability can be greatly improved, particularly, the slurry flow stability can be kept when the vehicle speed changes in the production process of the low-basis-weight dispersible non-woven fabric, and therefore generation of fish scale lines is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of non-woven fabric manufacturing equipment that can be dispersed. BACKGROUND

[0002] In recent years, with the rapid development of economy, people gradually increase the pursuit of quality of life, non-woven fabric products (such as facial mask, wash towel, makeup towel, wet toilet paper, etc.) become an important role in daily life, non-woven fabric as the material commonly used in non-woven fabric products on the market, with the advantages of raw material source extensive, soft and fluffy, with the increasing of people's environmental awareness, non-woven fabric develops towards green and environmental protection, and the non-woven fabric material that can be dispersed emerges as the times require.

[0003] Generally, the non-woven fabric that can be dispersed is manufactured by the manufacturing equipment shown in CN117604802A and CN117988149A, specifically, it usually includes inclined net former, water jet reinforcement device and drying device, it is found in practice that full-width fish scale phenomenon may occur under certain conditions using such former, in order to solve the full-width fish scale phenomenon, it is proposed in CN119615656A to set an upper cavity and a microporous plate in the second forming area, and the upper cavity is in a positive pressure state to improve the dewatering efficiency of the second forming area and thus reduce the fish scale phenomenon, this technical solution is mainly aimed at the non-woven fabric that can be dispersed with base weight greater than or equal to 75gsm and thickness greater than or equal to 0.62mm and developed under the process condition of vehicle speed greater than or equal to 130m / min, but in practice, the non-woven fabric that can be dispersed with low base weight such as 55gsm and 65gsm is more widely used, and there is still fish scale phenomenon, especially local fish scale phenomenon, which cannot be better solved by the above technical means.

[0004] Therefore, it is necessary to further propose an improved technical solution to solve the above technical problems. SUMMARY

[0005] Therefore, the present application provides a non-woven fabric manufacturing equipment that can be dispersed to solve the above technical problems.

[0006] A non-woven fabric manufacturing equipment that can be dispersed is used to manufacture non-woven fabric that can be dispersed, the non-woven fabric manufacturing equipment includes a forming unit, the forming unit includes a headbox and a forming wire, the forming wire includes a forming section, the headbox includes a lip plate, and a forming area between the lip plate and the forming section, an energy dissipation plate is arranged in the forming area, the energy dissipation plate includes a plate body and a plurality of through holes penetrating through the plate body, the through hole has a diameter of 10-18mm, and the opening rate of the through hole on the plate body is 35-45%, the plate body includes an extension direction, and the angle between the extension direction of the plate body and the forming section is 10°-25°, the lip plate includes a terminal located downstream of the slurry flow direction, and the energy dissipation plate is arranged adjacent to the terminal.

[0007] The lip plate comprises a first upper lip plate and a second upper lip plate arranged in sequence along the direction of the pulp flow, 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 forming area comprises a first forming area between the first upper lip plate and the first forming section and a second forming area between the second upper lip plate and the second forming section, the energy dissipation plate is arranged in the second forming area, and the second upper lip plate is parallel to the second forming section, the second upper lip plate further comprises a microporous plate facing the second forming area and an upper cavity above the microporous plate, the microporous plate comprises a plurality of micropores communicating the upper cavity and the second forming area, and the upper cavity is in a positive pressure state.

[0008] The pressure in the upper cavity is 4-6 kPa.

[0009] The second upper lip plate comprises a head end, the energy dissipation plate comprises a first end portion facing the head end, and the interval distance between the first end portion and the head end is greater than 15 cm.

[0010] The end is an end portion of the second upper lip plate away from the first upper lip plate, the energy dissipation plate comprises a second end portion facing the end, the interval distance between the second end portion and the end is 5-45 cm, and the energy dissipation plate is arranged at intervals with the second forming section and the second upper lip plate.

[0011] The energy dissipation plate comprises a projected area on the second forming section, and the projected area is 35-55% of the area of the second forming section.

[0012] The forming unit is configured to form a wet fiber web by shaping the pulp, the pulp comprises wood pulp and viscose fibers, and the diameter of the through hole is 1.2-1.5 times the average diameter of the viscose fibers.

[0013] The diameter of the micropore is 1-2 mm.

[0014] The distribution density of the micropores on the surface of the microporous plate is 1-4 / cm².

[0015] The angle between the energy dissipation plate and the forming section is adjustable.

[0016] Beneficial effects: the embodiment of the present application provides a dispersible non-woven fabric manufacturing equipment for manufacturing dispersible non-woven fabric, the dispersible non-woven fabric manufacturing equipment comprises a forming unit, the forming unit comprises a headbox and a forming wire, the forming wire comprises a forming section, the headbox comprises a lip plate, a forming area between the lip plate and the forming section, an energy dissipation plate is arranged in the forming area, the energy dissipation plate comprises a plate body and a plurality of through holes penetrating through the plate body, the through hole has a diameter of 10-18mm, the opening rate of the through hole on the plate body is 35-45%, the plate body comprises an extension direction, the angle between the extension direction of the plate body and the forming section is 10-25°, the lip plate comprises a tail end located downstream of the pulp flow direction, and the energy dissipation plate is arranged adjacent to the tail end, through the above arrangement, the pulp flow stability can be greatly improved, especially the pulp flow stability of the low-basis-weight dispersible non-woven fabric when the speed of the vehicle changes in the production process can be maintained, so that the generation of fish scales is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The dispersible non-woven fabric manufacturing equipment schematic diagram of the embodiment of the present application; Figure 2 For Figure 1 A zone enlarged schematic diagram; Figure 3 For Figure 1 Energy dissipation plate schematic diagram in the embodiment; Figure 4 For Figure 2 Second upper lip plate cross section schematic diagram in the embodiment; Figure element description: Headbox 10; first upper lip plate 11; second upper lip plate 12; tail end 1201; head end 1202; first forming area 110; second forming area 120; microporous plate 121; microporous hole 122; upper cavity 123; energy dissipation plate 13; plate body 130; first end 1301; second end 1302; through hole 131; forming wire 20; first forming section 21; second forming section 22. DETAILED DESCRIPTION

[0018] Please refer to Figure 1 , the embodiment of the present application provides a dispersible non-woven fabric manufacturing equipment for manufacturing dispersible non-woven fabric, to reduce the fish scales generated in the manufacturing process of the dispersible non-woven fabric.

[0019] The manufacturing device of the flushable nonwoven fabric comprises a forming unit for forming a wet fiber web by shaping a slurry, and the wet fiber web is formed into a flushable nonwoven fabric after being hydroentangled and dried. The slurry is a fiber suspension formed by dispersing fiber raw materials in water, wherein the fiber raw materials comprise natural fibers and regenerated fibers. The natural fibers can be at least one of wood pulp fibers, bamboo fibers, straw pulp fibers, cane pulp fibers, and cotton pulp fibers. Preferably, the natural fibers are wood pulp fibers with a length ranging from 2 to 4 mm, and the proportion in the fiber mixture is 60 to 80%. The wood pulp fibers have good hydrogen bond forming ability and mechanical strength, providing basic structural stability for the flushable nonwoven fabric. The regenerated fibers can be lyocell fibers with a length ranging from 8 to 12 mm and a linear density controlled between 1.2 and 1.8 denier, accounting for 20 to 40%. Lyocell fibers have excellent wet strength and biodegradability, which helps to improve the flushability of the product. It can be understood that the length is the average length, and the linear density is the average linear density. It can be understood that the selection of the fiber raw materials can be adjusted according to specific application requirements.

[0020] The forming unit comprises a headbox 10 and a forming wire 20. The forming wire 20 is configured in a endless loop shape and is supported by a plurality of rolls, including a breast roll upstream of the headbox 10. A portion of the forming wire 20 downstream of the breast roll is configured to be inclined upward relative to the horizontal direction, and this inclined upward section is referred to as the forming section. The headbox 10 applies the slurry onto the forming section from above, and the slurry is dehydrated and formed into a wet fiber web.

[0021] The headbox 10 includes a lip plate on the upper side of the forming section, and a forming area is formed between the lip plate and the forming section. The pulp enters the forming area and is dehydrated on the forming section to form a wet fiber web. The lip plate includes a terminal end 1201 downstream of the pulp flow direction. In this embodiment, the pulp flows from right to left, and the terminal end 1201 is the left end of the lip plate. An energy dissipation plate 13 is arranged adjacent to the terminal end 1201 in the forming area to dissipate the kinetic energy of the pulp and reduce the flow rate change, thereby reducing the generation of fish scales, especially the local fish scales on the wet fiber web. In research, it is found that one of the reasons for the generation of fish scales is the change of pulp flow in the forming area when the speed changes. The local fish scales are caused by the change of water pressure and pulp flow adjacent to the terminal end 1201. In addition, it is found in practice that the pulp flow needs to be more stable for low basis weight, especially for less than 55 gsm, especially for the production of flushable nonwoven fabrics. When the pressure changes when the terminal end 1201 of the forming area changes, the pulp flow backflow is formed, resulting in W-shaped fish scales. When the energy dissipation plate 13 is arranged in the forming area, the stability of the pulp flow can be greatly improved, especially the stability of the pulp flow of the low basis weight flushable nonwoven fabric during the speed change in the production process.

[0022] Specifically, the energy dissipation plate 13 includes a plate body 130 and a plurality of through holes 131 passing through the plate body 130. The diameter of the through hole 131 is 10-18 mm, and the opening rate of the through hole 131 on the plate body 130 is 35-45%. The plate body 130 includes an extension direction, and the angle between the extension direction of the plate body 130 and the forming section is 10°-25°. The extension direction of the plate body 130 specifically refers to the extension direction of the plate body 130 when the plate body 130 is a flat plate, and the upper surface of the plate body 130 includes an extension direction.

[0023] It can be understood that the energy dissipation plate 13 is arranged in a form inclined to the forming section, and also inclined to the lip plate. When the pulp flow changes, the energy dissipation plate 13 is arranged to guide the pulp flow to smoothly transition, and to dissipate the backflow when it occurs, thereby reducing the flow rate and pressure change.

[0024] In addition, research has found that the diameter of the through hole 131 is configured to be 1.2-1.5 times the average length of the viscose fiber. With this aperture setting, on the one hand, the energy dissipation plate 13 can reduce the blocking effect on the fiber, and on the other hand, the energy dissipation plate 13 can have sufficient energy dissipation effect.

[0025] Further, the lip plate comprises a first upper lip plate 11 and a second upper lip plate 12 arranged in sequence along the pulp flow direction, the forming section comprises 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, and the forming area comprises a first forming area 110 between the first upper lip plate 11 and the first forming section 21 and a second forming area 120 between the second upper lip plate 12 and the second forming section 22. It can be understood that the headbox 10 further comprises a flow area upstream of the first forming area 110, and the pulp flows from the flow area to the first forming area 110 and the second forming area 120, and is dehydrated to form a wet fiber web in the first forming section 21 and the second forming section 22.

[0026] 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 further comprises a microporous plate 121 facing the second forming area 120 and an upper cavity 123 above the microporous plate 121. The microporous plate 121 comprises a plurality of micropores 122 communicating the upper cavity 123 and the second forming area 120, and the upper cavity 123 is in a positive pressure state.

[0027] It can be understood that a negative pressure dehydration tank is arranged below the forming section, and the pulp is rapidly dehydrated to form a wet fiber web by the water flow of the headbox 10 and the negative pressure dehydration tank.

[0028] It can be understood that the energy dissipation plate 13 is arranged in the second forming area 120. Since the second upper lip plate 12 is parallel to the second forming section 22, the energy dissipation plate 13 is inclined to the second upper lip plate 12 and the second forming section 22 at the same time. In addition, the energy dissipation plate 13 does not extend to the first forming area 110, so as to avoid the formation of turbulent flow at the connection position of the first forming area 110 and the second forming area 120.

[0029] Further, the second upper lip plate 12 comprises a first end 1202, and the energy dissipation plate 13 comprises a first end portion 1301 facing the first end 1202. The distance between the first end portion 1301 and the first end 1202 is greater than 15 cm.

[0030] It can be understood that the end 1201 is the end of the second upper lip plate 12 away from the first upper lip plate 11. The energy dissipation plate 130 comprises a second end portion 1302 facing the end. The distance between the second end portion 1302 and the end 1201 is 5-45 cm. In addition, the energy dissipation plate 13 is arranged in a spaced manner with the second forming section 22 and the second upper lip plate 12.

[0031] Further, the energy dissipation plate 130 includes a projected area on the second forming section 22. The projected area is 35-55% of the area of the second forming section 22, so that the energy dissipation plate 130 can guide and dissipate the pulp flow, and the pulp flow dehydration is not affected by a large resistance.

[0032] Further, the upper cavity 123 is in a positive pressure state. More specifically, the positive pressure refers to a pressure of 4-6 kPa in the upper cavity 123. It can be understood that, because the energy dissipation plate 13 is arranged in the second forming section 120, the arrangement of the energy dissipation plate 13 forms resistance in the direction perpendicular to the air flow, so that the upper cavity 123 needs to use higher air pressure.

[0033] Further, the pore diameter of the micropore 122 is 1-2 mm. When the pore diameter of the micropore 122 is too small, air bubbles are prone to occur at the interface between the lower side of the micropore plate 121 and the pulp, resulting in poor surface of the wet fiber web. When the pore diameter of the micropore 122 is too large, the micropore 122 itself hinders the flow of the pulp or the movement of the wet fiber web, or further causes surface damage. In a specific embodiment, the pore diameter of the micropore 122 is about 1.6 mm.

[0034] Further, the distribution density of the micropore 122 on the surface of the micropore plate 121 is 1-4 per cm².

[0035] Further, the first upper lip plate 11 is adjustably arranged. In this embodiment, the first upper lip plate 11 includes a first adjusting device to adjust the inclination angle of the first upper lip plate 11 to adapt to the forming of different products.

[0036] Further, the second upper lip plate 12 is pivotally connected to the first upper lip plate 11 and is configured to be adjustably kept parallel to 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 be kept parallel to the second forming section 22.

[0037] Further, the angle between the energy dissipation plate 13 and the forming section is adjustable to adapt to the production needs of different flushable nonwoven fabrics.

[0038] The flushable nonwoven fabric manufacturing equipment is further described through specific embodiments as follows: Embodiment

[0039] The flushable nonwoven fabric manufacturing equipment is configured with a ZWB-81 type forming unit. The basic structure of the forming unit is the same as that shown in CN119615656A. The energy dissipation plate with the following specifications is arranged in the forming section. Through hole diameter: 12 mm; Aperture rate: 40% (circular hole) Plate angle: 15°; The pore size on the microplate is 1.6 mm. Micropore density: 2.5 pores / cm²; Upper cavity positive pressure: 4 kPa; The machine speed is 120m / min, and it produces washable nonwoven fabric with a basis weight of 55g / ㎡. The pulp ratio is: 80% wood pulp (average length 3.5mm) + 20% viscose fiber (average length 8mm). Example

[0040] The forming unit is the same as in Example 1, and an energy dissipation plate 13 with the following specifications is provided in the forming area: Through hole diameter: 15mm; Open area ratio: 42% (round holes); Plate angle: 20°; The pore size on the microplate is 1.8 mm. Micropore density: 2.0 pores / cm²; Upper cavity positive pressure: 4.5 kPa; The machine speed is 150m / min, and it produces washable nonwoven fabric with a basis weight of 45g / ㎡. The pulp ratio is: 80% wood pulp (average length 3.5mm) + 15% viscose fiber (average length 10mm) + 5% Tencel (average length 12mm).

[0041] Comparative Example 1: The forming unit is the same as in Example 1, except that no energy dissipation plate is provided in the forming area: Microplate pore size: 1.6mm Upper cavity positive pressure: 3 kPa The machine speed is 120m / min, and it produces washable nonwoven fabric with a basis weight of 55g / ㎡. The pulp ratio is: 80% wood pulp (average length 3.4mm) + 20% viscose fiber (average length 8mm).

[0042] Example 1 Example 2 Comparative Example 1 Scale incidence 0.6% 0.8% 2.5% The fish scale pattern occurrence rate refers to the number of times fish scale patterns with an area greater than 10cm² appear on a 100m length of washable nonwoven fabric. It is detected by visual inspection. According to the test results above, compared with the upper cavity using only positive pressure, the fish scale pattern occurrence rate of low basis weight washable nonwoven fabric is reduced by 68%-76%.

[0043] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A washable nonwoven fabric manufacturing apparatus for manufacturing washable nonwoven fabric, wherein the washable nonwoven fabric manufacturing apparatus includes a forming unit, characterized in that, The forming unit includes a headbox and a forming mesh. The forming mesh includes a forming section. The headbox includes a lip plate located in a forming area between the lip plate and the forming section. An energy dissipation plate is provided in the forming area. The energy dissipation plate includes a plate body and a plurality of through holes penetrating the plate body. The diameter of the through holes is 10-18 mm, and the opening ratio of the through holes on the plate body is 35-45%. The plate body includes an extension direction, and the angle between the extension direction of the plate body and the forming section is 10°-25°. The lip plate includes an end located downstream of the slurry flow direction, and the energy dissipation plate is provided adjacent to the end.

2. The washable nonwoven fabric manufacturing equipment as described in claim 1, characterized in that, The lip plate includes a first upper lip plate and a second upper lip plate arranged sequentially along the slurry flow direction. 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 forming area includes a first forming area located between the first upper lip plate and the first forming section and a second forming area located between the second upper lip plate and the second forming section. The energy dissipation plate is disposed in the second forming area. Meanwhile, the second upper lip plate is parallel to 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 micropores connecting the upper cavity and the second forming area, and the upper cavity is under positive pressure.

3. The washable nonwoven fabric manufacturing equipment as described in claim 2, characterized in that, The pressure inside the upper cavity is 4–6 kPa.

4. The washable nonwoven fabric manufacturing equipment as described in claim 2, characterized in that, The second upper lip plate includes a head end, and the energy dissipation plate includes a first end facing the head end, wherein the distance between the first end and the head end is greater than 15cm.

5. The washable nonwoven fabric manufacturing equipment as described in claim 2, characterized in that, The end is the end of the second upper lip plate away from the first upper lip plate. The energy dissipation plate includes a second end facing the end. The distance between the second end and the end is 5 to 45 cm. The energy dissipation plate, the second forming section, and the second upper lip plate are all spaced apart.

6. The washable nonwoven fabric manufacturing equipment as described in claim 2, characterized in that, The energy dissipation plate includes a projected area on the second forming section, and the projected area is 35% to 55% of the area of ​​the second forming section.

7. The washable nonwoven fabric manufacturing equipment as described in claim 2, characterized in that, The forming unit is configured to form a wet fiber web from a slurry, the slurry comprising wood pulp and viscose fiber, wherein the aperture of the through-hole is 1.2 to 1.5 times the average diameter of the viscose fiber.

8. The washable nonwoven fabric manufacturing equipment as described in claim 7, characterized in that, The pore size of the micropores is 1-2 mm.

9. The washable nonwoven fabric manufacturing equipment as described in claim 8, characterized in that, The distribution density of the micropores on the surface of the microporous plate is 1 to 4 per cm².

10. The washable nonwoven fabric manufacturing equipment as described in claim 9, characterized in that, The angle between the energy dissipation plate and the forming section is adjustable.

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