Preparation system suitable for melt-blown-wood pulp-melt-blown composite non-woven fabric

Abstract

The utility model discloses a preparation system suitable for melt-blown-wood pulp-melt-blown composite non-woven fabric, and belongs to the technical field of non-woven fabric production equipment, aiming at solving the problems that wood pulp fibers are easy to leak from a melt-blown layer and a device involved by adopting an online one-step composite technology is difficult to assemble and the like in the prior art. The device comprises a mesh belt receiver, a first melt-blowing device, a wood pulp fiber spraying device, a second melt-blowing device, a spunlace device and a winding device, and a continuous passage for preparing the melt-blowing-wood pulp-melt-blowing composite non-woven fabric by a wet method is formed among the first melt-blowing device, the wood pulp fiber spraying device, the second melt-blowing device, the spunlace device and the winding device. According to the utility model, a step-by-step on-line compounding process is carried out, so that the melt-blown layer is prepared more compactly, and wood pulp is not easy to leak out; and meanwhile, assembling and the like of all equipment in the preparation system are facilitated, and then the process requirements and the production target are better met.

Description

Technical Field

[0001] The utility model relates to a preparation system of non-woven fabrics, in particular to a preparation system suitable for melt-blown-wood pulp-melt-blown composite non-woven fabrics, belonging to the technical field of non-woven fabric production equipment. Background Art

[0002] Dual-spinning nonwoven fabric is a nonwoven material produced by dry process by combining ultrafine fibers produced by meltblowing process, which are only 1 / 8 of the fineness of man-made fibers, with wood pulp fibers and other functional fibers. This composite nonwoven fabric contains both continuous ultrafine long fibers and discontinuous native wood pulp fibers, and can add a certain proportion of functional fibers, polymer absorbent resin SAP / SAF and other auxiliary materials according to different application requirements, so that it has excellent performance and enriches the diversity of products.

[0003] At present, although the multi-row meltblown technology is used to prepare the twin-spinning nonwoven fabric, the meltblown layer adopts an online one-step composite technology, which makes the product relatively fluffy, and the wood pulp fiber is small in fineness and easy to leak out from the meltblown layer; and the wood pulp fiber has poor uniformity when laying the web; at the same time, the device layout based on the online composite technology is difficult.

[0004] Prior art CN212175180U discloses "a short-process meltblown nonwoven fabric processing device", which is equipped with a twin-screw extruder, a filter, a resin metering pump body, a spinneret assembly, an air supplier, a mesh belt receiver and a trimming winder, wherein the ordinary polypropylene raw material with a low melt index is directly converted into high melt index polypropylene in one step, and the meltblown nonwoven fabric is directly formed; CN220685426U discloses "a wood pulp meltblown composite nonwoven production equipment", which mainly solves the problem of different thickness of the existing wood pulp interlayer; CN113151976A discloses "a novel twin-spinning nonwoven fabric production equipment and process method thereof", although it coats and bonds the middle layer mixed with wood pulp fibers by the bottom layer and the upper layer to solve the problem of easy chip falling, it belongs to the dry method for preparing twin-spinning nonwoven fabrics, but it cannot solve the problem of wood pulp fiber leakage and improve the uniformity of wood pulp laying.

[0005] Therefore, a composite nonwoven fabric preparation system is needed which adopts a wet method, is convenient for device assembly, prevents wood pulp fibers from leaking out of the meltblown layer, and improves the uniformity of wood pulp fibers. Summary of the invention

[0006] The utility model aims to solve the problems in the prior art that wood pulp fibers are easy to leak out of the meltblown layer, and the difficulty of assembling the devices involved in the online one-step composite technology, and proposes a preparation system suitable for meltblown-wood pulp-meltblown composite non-woven fabrics. In this technical solution, a step-by-step online composite process is performed by setting up a first meltblown device, a wood pulp fiber ejection device, a second meltblown device, and a spunlace device; and by further limiting the corresponding nozzles, web forming distance, etc., the meltblown layer is prepared more densely, ensuring that the wood pulp fibers are not easy to leak out, and improving the uniformity of the wood pulp fibers when laying the web; at the same time, it is convenient to assemble the various equipment in the preparation system, so as to better meet the process requirements and production goals.

[0007] In order to achieve the above technical objectives, the following technical solutions are proposed:

[0008] A preparation system for melt-blown-wood pulp-melt-blown composite non-woven fabrics, comprising a mesh belt receiver, a first melt-blown device, a wood pulp fiber ejection device, a second melt-blown device, a spunlaced device and a winding device, wherein the first melt-blown device is arranged at the front side of the station of the wood pulp fiber ejection device, the second melt-blown device is arranged at the rear side of the station of the wood pulp fiber ejection device, the spunlaced device is arranged at the rear side of the station of the second melt-blown device, and the winding device is arranged at the rear side of the station of the spunlaced device; continuous mesh belts are arranged under the nozzles of the first melt-blown device, the nozzles of the wood pulp fiber ejection device and the nozzles of the second melt-blown device, and the continuous mesh belts are sleeved on the mesh belt receiver;

[0009] A continuous passage for wet-process preparation of meltblown-wood pulp-meltblown composite nonwoven fabric is formed between the first meltblowing device, the wood pulp fiber ejecting device, the second meltblowing device, the spunlace device and the winding device.

[0010] Furthermore, the distance between the meltblowing nozzle outlet on the first meltblowing device and the continuous mesh belt is 12-17 cm, and the distance between the meltblowing nozzle outlet on the second meltblowing device and the continuous mesh belt is 12-17 cm. The limitation of the web-forming distance ensures that the meltblown cloth is web-formed evenly, the prepared fibers are finer, the fibers are more evenly distributed, and the wood pulp is not easy to leak out.

[0011] Furthermore, the first melt-blowing device and the second melt-blowing device both use melt-blowing nozzles, the diameter of the spinnerets on the melt-blowing nozzles is 0.18-0.22 mm, and the spacing between adjacent spinnerets is 0.6-0.8 mm;

[0012] The wood pulp fiber ejection device adopts a lip mechanism that squeezes the wood pulp fiber into sheets and then ejects it in a mesh shape. The nozzle gap in the lip mechanism is 1.5-3mm. By limiting the diameter of the spinneret holes of each nozzle, when performing the step-by-step online composite process, it is ensured that the melt-blown layer is prepared more densely (the melt-blown fiber diameter is ensured to be distributed in 1-10µm, and the melt-blown fiber diameter is concentrated in 3-7µm), the wood pulp fiber is not easy to leak out, and the uniformity of the wood pulp fiber when laying the web is improved.

[0013] Furthermore, a suction duct is arranged on one side of the continuous mesh belt to collect the waste gas generated in the corresponding process and then perform post-processing, thereby improving the stability and safety of the working environment of the production line. The mesh belt receiver adopts a conventional mesh belt machine in the field, including a suction port, a continuous mesh belt and a transmission shaft.

[0014] Furthermore, the width of the continuous mesh belt is 1.5-4m.

[0015] Among them, the first melt-blowing device includes a screw extruder, a filter, a metering pump and a melt-blowing nozzle, which can be a conventional melt-blowing device in the art. Among them, the melt-blowing nozzle includes an upper die assembly and a lower die assembly, a melt channel is formed between the upper die assembly and the lower die assembly, and the melt channel extends to the nozzle; an upper air duct assembly is sleeved in the upper die assembly, and a lower air duct assembly is sleeved in the lower die assembly, and both the upper air duct assembly and the lower air duct assembly are connected to the nozzle through the air duct.

[0016] For the wood pulp fiber ejection device: a wood pulp fiber opening device is provided at the front side of the workstation, which uses wood pulp fiber as raw material. After being opened, it is ejected by the wood pulp fiber ejection device, and then a composite layer is formed on the continuous mesh belt. The wood pulp fiber ejection device includes a pulper, a pulp pump, a propeller and a lip mechanism. The lip mechanism ensures the high uniformity and production efficiency of the wood pulp in the subsequent products. At the same time, the pulp nozzle can eject wood pulp fibers with a fiber aspect ratio (300:1) higher than that of the wood pulp dry ejection equipment. Among them, the lip mechanism includes module I and module II. A spinneret gap for squeezing wood pulp fibers into sheets is formed between module I and module II. A wood pulp fiber inlet is provided at the upper end of the spinneret gap, and a wood pulp fiber web outlet is provided at the lower end.

[0017] The second meltblowing device includes a screw extruder, a filter, a metering pump and a meltblowing nozzle, which can be a conventional meltblowing device in the art. The meltblowing nozzle includes an upper die assembly and a lower die assembly, a melt channel is formed between the upper die assembly and the lower die assembly, and the melt channel extends to the nozzle; an upper air duct assembly is sleeved in the upper die assembly, and a lower air duct assembly is sleeved in the lower die assembly, and both the upper air duct assembly and the lower air duct assembly are connected to the nozzle through the air duct.

[0018] The hydroentanglement device includes a hydroentanglement plate and a hydroentanglement head. The hydroentanglement plate is provided with a round net inside. The hydroentanglement plate is connected to the hydroentanglement head through a water suction port. The hydroentanglement device is connected to a water circulation system. The hydroentanglement device can be a conventional hydroentanglement device in the art.

[0019] The positional relationships involved in this technical solution, such as "front of the workstation", "rear of the workstation", "above", "below", and "between", are defined according to the conditions under actual use. They are conventional terms in this technical field and are also conventional terms used by technical personnel in this field in actual use.

[0020] The beneficial technical effects brought about by adopting this technical solution are:

[0021] In the utility model, a continuous passage for wet-process preparation of meltblown-wood pulp-meltblown composite non-woven fabric is formed between the first meltblown device, the wood pulp fiber ejecting device, the second meltblown device, the spunlace device and the winding device, thereby realizing step-by-step online composite technology; and, by further limiting the corresponding nozzles, web forming distance, etc., the meltblown fiber diameter distribution is ensured to be 1-10µm, and the meltblown fiber diameter is concentrated in 3-7µm, that is, the meltblown layer is prepared more densely, the wood pulp is not easy to leak out, and the uniformity of the wood pulp fiber when laying the web is improved; subsequently, through the spunlace process, a new type of meltblown-wood pulp-meltblown composite non-woven fabric with a soft hand feel and not easy to leak wood pulp is prepared to meet actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a process flow chart involved in the utility model;

[0023] Figure 2 It is a structural schematic diagram of the meltblowing nozzle involved in the utility model;

[0024] Figure 3 It is a schematic diagram of the arrangement of the wood pulp fiber ejection device of the utility model;

[0025] Figure 4 It is a structural schematic diagram of a wood pulp nozzle in the utility model;

[0026] Figure 5 It is a schematic diagram of the arrangement of the water jet plate and the water jet head in the water jet device of the utility model;

[0027] In the figure, 1. mesh belt receiver, 2. first melt-blowing device, 3. wood pulp fiber ejecting device, 4. second melt-blowing device, 5. spunlace device, 6. winding device, 7. suction duct, 8. melt-blowing nozzle, 81. upper die head assembly, 82. lower die head assembly, 83. melt channel, 84. upper air duct assembly, 85. lower air duct assembly, 86. air duct, 87. nozzle; 9. spray lip mechanism, 91. module I, 92. module II, 93. spinneret gap, 94. wood pulp fiber inlet, 95. wood pulp fiber web outlet, 10. water needle plate, 101. round net, 102. water suction port, 11. spunlace head, 12. wood pulp fiber loosening device. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example 1

[0030] This embodiment provides: a preparation system suitable for meltblown-wood pulp-meltblown composite nonwoven fabric, such as Figure 1 As shown, it includes a mesh belt receiver 1, a first melt-blown device 2, a wood pulp fiber ejecting device 3, a second melt-blown device 4, a spunlace device 5 and a winding device 6, the first melt-blown device 2 is arranged at the front side of the work station of the wood pulp fiber ejecting device 3, the second melt-blown device 4 is arranged at the rear side of the work station of the wood pulp fiber ejecting device 3, the spunlace device 5 is arranged at the rear side of the work station of the second melt-blown device 4, and the winding device 6 is arranged at the rear side of the work station of the spunlace device 5; continuous mesh belts are arranged under the nozzle of the first melt-blown device 2, under the nozzle of the wood pulp fiber ejecting device 3 and under the nozzle of the second melt-blown device 4, and the continuous mesh belt is sleeved on the mesh belt receiver 1; a continuous passage for wet-process preparation of melt-blown-wood pulp-melt-blown composite non-woven fabric is formed between the first melt-blown device 2, the wood pulp fiber ejecting device 3, the second melt-blown device 4, the spunlace device 5 and the winding device 6.

[0031] In this technical solution, the step-by-step online compounding technology is implemented, that is, the work process involved includes:

[0032] 1. Produce the first layer of meltblown cloth through the first meltblown device 2;

[0033] 2. The wood pulp fibers are evenly sprayed on the surface of the first layer of meltblown cloth through the wood pulp fiber spraying device 3 to form a wood pulp fiber layer-meltblown cloth layer;

[0034] 3. The second melt-blown cloth is produced through the second melt-blown device 4 to cover the wood pulp fiber layer, that is, a melt-blown cloth layer-wood pulp fiber layer-melt-blown cloth layer is formed.

[0035] The mesh belt receiver 1 is used to receive and transport the meltblown cloth layer and / or the wood pulp fiber layer.

[0036] In this preparation system, a wet method is adopted to prepare wood pulp fibers into a web, and further ensure that the composite nonwoven fabric produced has uniform weight and is not prone to chipping. The melt-blown process is carried out twice to achieve better results. At the same time, the stability and continuity of the melt-blown-wood pulp-melt-blown composite nonwoven fabric production route are guaranteed.

[0037] Example 2

[0038] On the basis of Example 1, in order to further ensure that the melt-blown cloth is formed uniformly, the prepared fiber fineness is higher, the fiber distribution is more uniform, and the wood pulp is not easy to leak out, the web forming distance is further limited in this example:

[0039] The distance between the outlet of the meltblowing nozzle 8 on the first meltblowing device 2 and the continuous mesh belt is 12-17 cm, and the distance between the outlet of the meltblowing nozzle 8 on the second meltblowing device 4 and the continuous mesh belt is 12-17 cm.

[0040] Example 3

[0041] On the basis of Examples 1-2, in order to further ensure that the melt-blown layer is prepared more densely (the melt-blown fiber diameter is distributed in 1-10 µm and the melt-blown fiber diameter is concentrated in 3-7 µm) during the step-by-step online composite process, ensure that the wood pulp fiber is not easy to leak out, and improve the uniformity of the wood pulp fiber when laying the web, etc., the corresponding nozzle is further defined in this embodiment:

[0042] The first melt-blowing device 2 and the second melt-blowing device 4 both use a melt-blowing nozzle 8, the diameter of the spinneret holes on the melt-blowing nozzle 8 is 0.18-0.22 mm, and the spacing between adjacent spinneret holes is 0.6-0.8 mm;

[0043] The wood pulp fiber ejecting device 3 adopts a lip mechanism 9 which squeezes the wood pulp fiber into sheets and then ejects it into a net shape. The spinneret gap 93 in the lip mechanism 9 is 1.5-3 mm.

[0044] Example 4

[0045] On the basis of Examples 1-3, in order to improve the stability and safety of the working environment of the production line, this embodiment collects the waste gas generated in each section of the continuous mesh belt, that is, further defines:

[0046] A suction duct 7 is arranged on one side of the continuous mesh belt to collect the waste gas generated in the corresponding process.

[0047] The waste gas is mainly propylene monomer, which is generated when the melt-blown ultrafine fibers are sprayed out. After being sucked by the suction duct 7, it is treated by the secondary activated carbon adsorption system.

[0048] In addition, the waste liquid generated during the preparation of meltblown-wood pulp-meltblown composite non-woven fabrics is mainly pulp waste liquid, which can be recycled after being purified by a water circulation system.

[0049] Example 5

[0050] On the basis of Examples 1-4, this example further limits the arrangement of the wood pulp fiber ejecting device 3 to further illustrate the technical solution.

[0051] like Figure 3 As shown, a wood pulp fiber opening device 12 is provided at the front side of the workstation of the wood pulp fiber ejecting device 3. The wood pulp fiber is used as raw material, and after being opened, it is ejected from the wood pulp fiber ejecting device 3, and then a composite layer is formed on the continuous mesh belt.

[0052] Example 6

[0053] Based on Examples 1-5, the mesh belt receiver 1, the first melt-blowing device 2, the wood pulp fiber ejecting device 3, the second melt-blowing device 4, the water-entanglement device 5 and the winding device 6 involved in the preparation system are all conventional equipment in the field.

[0054] Mesh belt receiver 1: A conventional mesh belt machine in the art is used, including an air suction port, a continuous mesh belt, and a transmission shaft, etc. In order to better adapt to the meltblown-wood pulp-meltblown composite non-woven fabric produced in this preparation system, a continuous mesh belt with a width of 1.5-4m is preferred;

[0055] The first melt-blowing device 2 includes a screw extruder, a filter, a metering pump and a melt-blowing nozzle 8, which can be a conventional melt-blowing device in the art. Figure 2 As shown, the meltblowing nozzle 8 includes an upper die head assembly 81 and a lower die head assembly 82, a melt channel 83 is formed between the upper die head assembly 81 and the lower die head assembly 82, and the melt channel 83 extends to the nozzle 87; an upper air duct assembly 84 is sleeved in the upper die head assembly 81, and a lower air duct assembly 85 is sleeved in the lower die head assembly 82, and both the upper air duct assembly 84 and the lower air duct assembly 85 are connected to the nozzle 87 through the air duct 86.

[0056] The wood pulp fiber ejection device 3 includes a pulper, a pulp pump, a propeller and a lip mechanism 9. The lip mechanism 9 ensures the high uniformity and production efficiency of the wood pulp in the subsequent product. At the same time, the pulp ejector can eject wood pulp fibers with a fiber aspect ratio (300:1) higher than that of the wood pulp dry ejection device. Figure 4 As shown, the lip mechanism 9 includes a module I 91 and a module II 92. A spinneret gap 93 for squeezing wood pulp fibers into sheets is formed between the module I 91 and the module II 92. A wood pulp fiber inlet 94 is provided at the upper end of the spinneret gap 93, and a wood pulp fiber web outlet 95 is provided at the lower end.

[0057] The second melt-blowing device 4 includes a screw extruder, a filter, a metering pump and a melt-blowing nozzle 8, which can be a conventional melt-blowing device in the art. Figure 2 As shown, the meltblowing nozzle 8 includes an upper die head assembly 81 and a lower die head assembly 82, a melt channel 83 is formed between the upper die head assembly 81 and the lower die head assembly 82, and the melt channel 83 extends to the nozzle 87; an upper air duct assembly 84 is sleeved in the upper die head assembly 81, and a lower air duct assembly 85 is sleeved in the lower die head assembly 82, and both the upper air duct assembly 84 and the lower air duct assembly 85 are connected to the nozzle 87 through the air duct 86.

[0058] Water spunlace device 5: Figure 5 As shown, it includes a water needle board 10 and a water needle head 11. The water needle board 10 is provided with a round net 101. The water needle board 10 is connected to the water needle head 11 through a water suction port 102. The water needle device 5 is connected to a water circulation system. The water needle device 5 can be a conventional water needle device in the art.

Claims

1. A preparation system for meltblown-wood pulp-meltblown composite nonwoven fabric, characterized in that: The invention comprises a mesh belt receiver (1), a first melt-blowing device (2), a wood pulp fiber ejecting device (3), a second melt-blowing device (4), a water-spinning device (5) and a winding device (6), wherein the first melt-blowing device (2) is arranged at the front side of the workstation of the wood pulp fiber ejecting device (3), the second melt-blowing device (4) is arranged at the rear side of the workstation of the wood pulp fiber ejecting device (3), the water-spinning device (5) is arranged at the rear side of the workstation of the second melt-blowing device (4), and the winding device (6) is arranged at the rear side of the workstation of the water-spinning device (5); continuous mesh belts are arranged below the nozzle of the first melt-blowing device (2), below the nozzle of the wood pulp fiber ejecting device (3) and below the nozzle of the second melt-blowing device (4), and the continuous mesh belt is sleeved on the mesh belt receiver (1); A continuous passage for wet-process preparation of meltblown-wood pulp-meltblown composite non-woven fabric is formed between the first meltblown device (2), the wood pulp fiber ejecting device (3), the second meltblown device (4), the spunlace device (5) and the winding device (6).

2. The preparation system for meltblown-wood pulp-meltblown composite nonwoven fabric according to claim 1, characterized in that: The distance between the outlet of the meltblowing nozzle (8) on the first meltblowing device (2) and the continuous mesh belt is 12-17 cm, and the distance between the outlet of the meltblowing nozzle (8) on the second meltblowing device (4) and the continuous mesh belt is 12-17 cm.

3. The preparation system for meltblown-wood pulp-meltblown composite nonwoven fabric according to claim 1 or 2, characterized in that: The first melt-blowing device (2) and the second melt-blowing device (4) both use a melt-blowing nozzle (8), the diameter of the spinneret holes on the melt-blowing nozzle (8) are both 0.18-0.22 mm, and the spacing between adjacent spinneret holes is both 0.6-0.8 mm; The wood pulp fiber ejecting device (3) uses a lip mechanism (9) that squeezes the wood pulp fibers into sheets and then ejects them in a net-like shape. The ejection gap (93) in the lip mechanism (9) is 1.5-3 mm.

4. The preparation system for meltblown-wood pulp-meltblown composite nonwoven fabric according to claim 1, characterized in that: A suction air duct (7) is arranged on one side of the continuous mesh belt.

5. The preparation system for meltblown-wood pulp-meltblown composite nonwoven fabric according to claim 1, characterized in that: The width of the continuous mesh belt is 1.5-4m.

6. The preparation system for meltblown-wood pulp-meltblown composite nonwoven fabric according to claim 1, characterized in that: A wood pulp fiber opening device (12) is provided at the front side of the workstation of the wood pulp fiber ejecting device (3).

Images