Mixed spraying layer, non-woven composite material preparation device and non-woven composite material

Abstract

The invention discloses a mixed spraying layer, a non-woven composite material preparation device and a non-woven composite material, and relates to the technical field of composite material manufacturing, and the mixed spraying layer preparation device comprises an opening and mixing device, a driving and conveying device, a feeding amount control device, a fiber distribution device, a conveying assembly, a mixed spraying box body and a polymer system. The driving and conveying device is used for driving and conveying fibers discharged from the opening and mixing device to the feeding quantity control device and feeding the fibers into the fiber distribution device through the feeding quantity control device, and a height detection device is arranged in the fiber distribution device; the fiber distribution device can distribute fibers in the breadth direction and discharge the distributed fibers through the discharge port, the conveying assembly conveys the fibers discharged from the discharge port of the fiber distribution device into the mixed spraying box body, and the polymer system is used for producing polymer filaments and spraying the polymer filaments into the mixed spraying box body. The short fibers can be used for preparing the composite material, and the prepared product is good in quality.

Description

Technical Field

[0001] The invention relates to the technical field of composite material production, in particular to a mixed spray layer, a non-woven composite material preparation device and a non-woven composite material. Background Art

[0002] Nonwoven fabrics can be seen everywhere in daily life and industrial production, especially the demand for disposable sanitary products has greatly increased. At present, products using multi-fiber mixed spray dry web technology are becoming more and more popular in the nonwoven industry. They are mainly a composite material with strong water absorption achieved by meltblown fibers and cellulose fibers through mixed spray technology; currently similar technologies can only use sheets or coils, which can only be used after being defibrated by defibration equipment. There are specific requirements for the form of raw materials. The price of this type of raw materials is relatively high, and the cost of making sheets with fibers is relatively high. In addition, the fiber will be damaged during the defibration process, increasing the content of broken fibers. In addition, the sheet defibration is easy to retain lumps, which has a great impact on the appearance of the product. Secondly, short fibers such as noil, recycled cotton, and bamboo fiber exist in the state of loose fibers. Traditional equipment cannot use fibers in this state, resulting in some fibers not being able to be made into products using this mixed spray web method. Summary of the invention

[0003] The purpose of the present invention is to provide a mixed spray layer, a non-woven composite material preparation device and a non-woven composite material to solve the problems existing in the above-mentioned prior art, have low requirements on the form of raw materials, use short fibers to make composite materials, and the quality of the products obtained is good.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a mixed spray layer preparation device, comprising: an opening and mixing device, a driving device, a feeding amount control device, a fiber distribution device, a conveying component, a mixed spray box and a polymer system, wherein the opening and mixing device is used to open and mix the raw materials; the driving device is used to drive the fibers discharged from the opening and mixing device to the feeding amount control device and feed the fibers to the fiber distribution device through the feeding amount control device, and the fiber distribution device is provided with a height detection device, and the height detection device is used to detect whether the height of the raw materials in the fiber distribution device exceeds a set threshold value, when the fiber When the height of the raw material in the distribution device is lower than the set threshold, the feed amount control device is controlled to feed the raw material to the fiber distribution device. When the height of the raw material in the fiber distribution device is not lower than the set threshold, the feed amount control device is controlled to stop feeding the raw material to the fiber distribution device. The fiber distribution device can distribute the fibers along the width direction and discharge the distributed fibers through the discharge port. The conveying component conveys the fibers discharged from the discharge port of the fiber distribution device to the mixing and spraying box. The polymer system is used to produce polymer filaments and spray the polymer filaments into the mixing and spraying box.

[0006] Preferably, the conveying assembly includes a vertically arranged transmission pipe and a horizontally arranged transmission mesh curtain, the bottom of the transmission pipe extends from the top of the mixing spray box into the mixing spray box, the fibers discharged from the discharge port of the fiber distribution device are transported to the transmission pipe through the transmission mesh curtain, the bottom structure of the transmission pipe is constructed as a fiber nozzle, and a CD scattering distributor is integrated on the transmission pipe, the CD scattering distributor includes a plurality of airflow nozzles arranged in sequence along the width direction, the gas injection direction of the airflow nozzle is downward, and the flow rate of fibers at different width positions is adjusted by controlling the injection flow rate of each of the airflow nozzles.

[0007] Preferably, the spraying direction of the fiber nozzle is adjustable.

[0008] Preferably, the fiber nozzle includes two outer plates arranged in sequence along the length direction, the length direction is perpendicular to the width direction, the two outer plates are inclined in opposite directions from top to bottom, two baffles are arranged between the two outer plates, the two baffles are arranged in sequence along the length direction, the two baffles are parallel, the two baffles are movably arranged, the two baffles are driven to move by a baffle driving device, and the top edges of the two baffles are not lower than the top edges of the two outer plates.

[0009] Preferably, an inclined plate is fixedly provided on one side of the two baffles that are away from each other, and the two inclined plates are respectively parallel to the two outer plates.

[0010] Preferably, the fiber distribution device is a flat screen rotor type forming head or a dust cage type forming head, and the fiber distribution is adjusted by controlling the relative rotation speed of the agitators at various locations in the flat screen rotor type forming head.

[0011] Preferably, a raw material storage position and a push plate are provided on the front side of the feed port of the opening and mixing device, the raw material storage position is used to place the raw materials, and the push plate is used to push the raw materials on the raw material storage position toward the feed port of the opening and mixing device.

[0012] The present invention also provides a nonwoven composite material preparation device, comprising: a negative pressure mesh curtain assembly, a first polymer system, a plurality of mixed spray layer preparation devices as described above, a second polymer system and a hot rolling mill;

[0013] The negative pressure mesh curtain assembly includes a mesh curtain and a negative pressure device for making the working surface of the mesh curtain in a negative pressure state. The filament injection head of the first polymer system, the mixing spray box and the filament injection head of the second polymer system are arranged in sequence directly above the mesh curtain along the transmission direction of the mesh curtain, and the hot rolling mill is arranged on one side of the tail of the mesh curtain.

[0014] The present invention also provides a nonwoven composite material, which is made by the nonwoven composite material preparation device as described above, and comprises a first polymer fiber layer, a mixed spray layer, and a second polymer fiber layer arranged in sequence from top to bottom; the first polymer fiber layer and the second polymer fiber layer are mixed by a thermoplastic polymer and a functional masterbatch; the average diameter of the filaments constituting the fiber layer is in the range of 0.1 μm to 20 μm, and the gram weight of each layer is in the range of 0.5 gsm to 15 gsm; and each fiber layer is prepared by a spunbond process or a meltblown process;

[0015] The mixed spray layer is formed by spraying cellulose staple fibers and polymer filaments, the length of the cellulose staple fibers is 0.1 mm to 8 mm, the average diameter of the polymer filaments is in the range of 0.1 μm to 10 μm, and the mass ratio of the cellulose staple fibers to the polymer filaments in the mixed spray layer is 10:90 to 80:20; the mixed spray layer is formed by spraying at least one layer of the cellulose staple fibers and the polymer filaments.

[0016] Preferably, the cellulose short fibers are wood pulp fibers, short-cut cotton fibers, short-cut bamboo fibers, short-cut bamboo pulp fibers, and short-cut viscose fibers, wherein the short-cut cotton fibers are derived from raw cotton, combed cotton waste, and waste cotton textiles crushed and defibrinated recycled cotton, and are obtained through processes such as scouring, bleaching, and cutting; the bamboo fibers are obtained through a soaking and steaming process;

[0017] The thermoplastic polymer is one or more of polypropylene, polyethylene, polyester, nylon, polyurethane, polylactic acid and thermoplastic biodegradable plastics; the functional masterbatch is one or more of biodegradable masterbatch, hydrophilic masterbatch, soft masterbatch, elastomer masterbatch and antibacterial masterbatch.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The present invention utilizes an opening and mixing device to loosen short fibers such as dropped cotton, recycled cotton, and bamboo fiber, and has low requirements on the raw material form. A fiber distribution device is utilized to distribute the short fibers along the width direction, so that the material distribution of the manufactured product along the width direction is uniform, thereby improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a mixed spray layer preparation device and a non-woven composite material preparation device provided in an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a flat screen rotor type forming head;

[0023] Figure 3 for Figure 2 Schematic diagram of the distribution of agitators in the middle;

[0024] Figure 4 It is a structural schematic diagram of a dust cage type forming head;

[0025] Figure 5 is a schematic diagram of the structure of a fiber nozzle in a state where three channels are opened;

[0026] Figure 6 is a schematic diagram of the structure of the fiber nozzle in a state where the middle channel and the right channel are opened;

[0027] Figure 7 is a schematic diagram of the structure of the fiber nozzle in a state where the middle channel is opened;

[0028] Figure 8 is a structural schematic diagram of a fiber nozzle in a right channel open state;

[0029] In the figure: 1-push plate; 2-raw material storage position; 3-opening and mixing device; 5-feeding amount control device; 4-driving pipeline; 6-driving device; 7-fiber distribution device; 8-transmission mesh curtain; 9-CD scattering distributor; 10-transmission pipeline; 11-first polymer system; 12-third polymer system; 13-fourth polymer system; 14-fifth polymer system; 15-sixth polymer system; 16-second polymer system; 17-spraying system; 18-mesh curtain; 19-net bottom suction; 20-mixing spray box; 21-hot rolling mill; 22-storage box; 23-height detection device; 24-agitator; 25-driving motor; 26-discharging port of fiber distribution device; 27-rotation direction indicator line; 28-dust cage; 29-metal beater; 30-fiber nozzle; 31-left channel; 32-middle channel; 33-baffle; 34-right channel; 35-tilted plate. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The present invention provides a mixed spray layer preparation device, such as Figure 1 to Figure 3As shown, it includes: an opening and mixing device 3, a driving device 6, a feeding amount control device 5, a fiber distribution device 7, a conveying component, a mixing and spraying box 20 and a polymer system. The opening and mixing device 3 is used to open and mix the raw materials; the driving device 6 is used to drive the fibers discharged from the opening and mixing device 3 to the feeding amount control device 5 and feed the fibers to the fiber distribution device 7 through the feeding amount control device 5. The fiber distribution device 7 is equipped with a height detection device 23. The height detection device 23 is used to detect whether the height of the raw materials in the fiber distribution device 7 exceeds the set threshold value. When the height of the raw materials in the fiber distribution device 7 is lower than the set threshold value, the height detection device 23 is used to detect whether the height of the raw materials in the fiber distribution device 7 exceeds the set threshold value. When a threshold is set, the feed amount control device 5 is controlled to feed raw materials to the fiber distribution device 7. When the height of the raw materials in the fiber distribution device 7 is not lower than the set threshold, the feed amount control device 5 is controlled to stop feeding the raw materials to the fiber distribution device 7. The fiber distribution device 7 can distribute the fibers along the width direction and discharge the distributed fibers through the discharge port. The conveying component conveys the fibers discharged from the discharge port of the fiber distribution device 7 to the mixing and spraying box 20. The polymer system is used to produce polymer filaments and spray the polymer filaments into the mixing and spraying box 20. The polymer filaments and short fibers are mixed and fall on the negative pressure mesh curtain 18 to form a mixed layer.

[0033] The present invention utilizes an opening and mixing device 3 to open short fibers such as dropped cotton, recycled cotton, and bamboo fibers, and utilizes a fiber distribution device 7 to distribute the short fibers along the width direction, so that the material distribution of the manufactured product along the width direction is uniform, thereby improving product quality.

[0034] The height detection device 23 in the above embodiment may be a photoelectric sensor, which is arranged at a suitable height position in the fiber distribution device 7. The height position is the set height threshold. When the fiber stacking height in the fiber distribution device 7 blocks the detection end of the photoelectric sensor, it means that its height is not lower than the set height threshold. Otherwise, it is judged that its height is lower than the set height threshold.

[0035] The mixing spray box 20 in the above embodiment mainly functions to create a semi-enclosed space for the cross-mixing of polymer filaments and short fibers. It can be made of a variety of materials, such as metal, usually steel, but can also be a sufficiently hard polymer material, such as polycarbonate, or even glass.

[0036] In some embodiments, the conveying assembly includes a vertically arranged transmission pipe 10 and a horizontally arranged conveying mesh curtain 18. The bottom of the transmission pipe 10 extends from the top of the mixing spray box 20 into the mixing spray box 20. The fibers discharged from the discharge port of the fiber distribution device 7 are conveyed to the transmission pipe 10 through the conveying mesh curtain 18. The bottom structure of the transmission pipe 10 is a fiber nozzle 30. The transmission pipe 10 is integrated with a CD scattering distributor 9. The CD scattering distributor 9 includes a plurality of airflow nozzles arranged in sequence along the width direction. The gas injection direction of the airflow nozzle is downward. The flow rate of fibers at different width positions is adjusted by controlling the injection flow rate of each airflow nozzle.

[0037] This embodiment uses air-laid process to prepare the nonwoven composite material. Each CD scattering distributor 9 adjusts its own air jet volume through an electromagnetic control valve body, thereby controlling the flow rate of short fibers at the corresponding position.

[0038] The transmission mesh curtain 8 is provided with a bottom suction device 19 to prevent the short fibers from being dispersed to the outside and polluting the air and equipment due to air flow disturbance; the transmission mesh curtain 8 transports the falling short fibers to the transmission pipeline 10, and then passes through the CD scattering distributor 9 and the fiber nozzle 30 and enters the mixing spray box 20 for mixing and molding.

[0039] In some embodiments, the CD scattering distributor 9 communicates and interconnects with an online grammage detection device. The online grammage detection device can detect the grammage information at different positions in the width direction of the product on the mesh curtain 18, and transmit it to the controller. The controller can adjust the air jet volume of the CD scattering distributor 9 according to the online grammage detection data, thereby satisfying the uniform control of the grammage.

[0040] In some embodiments, the spraying direction of the fiber spray head 30 is adjustable.

[0041] Specifically, the fiber nozzle 30 includes two outer plates arranged in sequence along the length direction, the length direction is perpendicular to the width direction, the two outer plates are inclined in opposite directions from top to bottom, two baffles 33 are arranged between the two outer plates, the two baffles 33 are arranged in sequence along the length direction, the two baffles 33 are parallel, the two baffles 33 are movably arranged, the two baffles 33 are driven to move by a baffle 33 driving device, and the top edges of the two baffles 33 are not lower than the top edges of the two outer plates.

[0042] This embodiment can adjust the cross-mixing area of ​​the short fibers and the polymer filaments, and can flexibly adjust them according to different needs. This embodiment can divide the fiber nozzle 30 into three channels, namely the left channel 31, the middle channel 32 and the right channel 34. The opening and closing and size of the channels can be adjusted by adjusting the position of the baffle 33. Figures 5 to 8 shown.

[0043] In an achievable embodiment, sliding tracks are provided on the front and rear sides of the fiber nozzle 30, and two baffles 33 are slidably provided on the sliding tracks. The driving device of the baffle 33 is a motor, and the baffle 33 is driven to move forward and backward by the motor and a matching transmission component. The transmission component can be a gear rack or a chain sprocket, etc. Secondly, the driving device of the baffle 33 can also be set as a linear motor, and the linear motor controls the linear movement of the baffle 33.

[0044] In some embodiments, an inclined plate 35 is fixedly disposed on the opposite sides of the two baffles 33 , and the two inclined plates 35 are parallel to the two outer plates respectively.

[0045] like Figures 5 to 8 As shown, the ejection direction of the short fibers is guided.

[0046] In some embodiments, the fiber distribution device 7 is a flat screen rotor type forming head or a dust cage 28 type forming head, and the fiber distribution is adjusted by controlling the relative rotation speed of the agitators 24 at various locations in the flat screen rotor type forming head.

[0047] like Figure 4 As shown, the short fibers enter the dust cage 28 from one side of the dust cage 28, and the rotation direction of the metal beater 29 is opposite to that of the dust cage 28. The short fibers are evenly distributed along the width direction after being acted upon by the metal beater 29, and fall onto the transmission mesh curtain 8 through the long waist holes on the outside of the dust cage 28.

[0048] In some embodiments, a raw material storage position 2 and a push plate 1 are provided in front of the feed port of the opening and mixing device 3. The raw material storage position 2 is used to place the raw materials, and the push plate 1 is used to push the raw materials on the raw material storage position 2 toward the feed port of the opening and mixing device 3.

[0049] When this embodiment is in use, the short fiber raw materials in the form of ton bags (the outer packaging needs to be removed) are placed in the raw material storage position 2, and the push plate 1 applies auxiliary force to push the raw materials into the opening and mixing device 3 for opening and mixing. Since the selected short fiber raw materials are all processed clean raw materials, there is no need to carry out cleaning, impurity removal and other processes; the fiber raw materials after opening and mixing are driven by the transmission fan and enter the feeding amount control device 5 through the driving pipe 4, that is, the driving device 6 in this embodiment is a transmission fan.

[0050] The present invention also provides a nonwoven composite material preparation device, comprising: a negative pressure mesh curtain assembly, a first polymer system 11, a plurality of mixed spray layer preparation devices as described above, a second polymer system 16 and a hot rolling mill 21;

[0051] The negative pressure mesh curtain assembly includes a mesh curtain 18 and a negative pressure device for making the working surface of the mesh curtain 18 in a negative pressure state. The filament injection head of the first polymer system 11, the mixing spray box 20 and the filament injection head of the second polymer system 16 are arranged in sequence directly above the mesh curtain 18 along the transmission direction of the mesh curtain 18, and the hot rolling mill 21 is arranged on one side of the tail of the mesh curtain 18.

[0052] The non-woven composite material preparation device includes multiple sets of polymer systems, wherein the filaments produced by the first polymer system 11 and the second polymer system 16 constitute the upper fiber and the bottom fiber of the material, the polymer system can be a meltblown production system, and the spinneret assembly used is a coaxial meltblown spinneret assembly or a conventional knife-drawing spinneret assembly. The number of rows of spinneret holes on the spinneret of the coaxial meltblown spinneret assembly can be single-row or multi-row configuration, and the number of spinneret holes on the spinneret of the conventional knife-drawing spinneret assembly can be single-row or approximately double-row staggered configuration, and the diameter of the spinneret hole is 1 to 5 μm; the first polymer system 11 and the second polymer system 16 can also be a spunbond production system, and the polymer raw material is passed through a slit-drawing spunbond system to complete spinning and laying.

[0053] The polymer system for mixing with the cellulose staple fibers in the mixing spray box 20 is a melt-blown production system, and the spinneret assembly used is a coaxial melt-blown spinneret assembly or a conventional split-knife drafting spinneret assembly. The number of rows of spinneret holes on the spinneret of the coaxial melt-blown spinneret assembly can be single-row or multi-row configuration, and the number of spinneret holes on the spinneret of the conventional split-knife drafting spinneret assembly can be single-row or approximately double-row staggered configuration;

[0054] The polymer systems involved in this patent can be started and shut down independently, and are equipped with main raw material and auxiliary raw material adding devices independently. Each system can operate independently without interfering with each other.

[0055] A spray system 17 is disposed below the first polymer system 11 and the second polymer system 16. After the polymer filaments are ejected, they are cooled by the spray system 17, which can effectively accelerate the cooling of the fibers and improve the strength of the fibers. The spray system 17 is located at a position 5 to 50 cm below the spinneret, with an angle of 90 to 180° with the ejection direction of the chemical fiber, and a spray volume of 0 to 200 L / h. The spray system 17 can spray pure water or functional additives. The functional additives can be antibacterial additives, water-absorbing additives, softening additives, etc. Softening agents and other additives that give special functions to the fiber web; specifically, the antibacterial agent includes one or more of quaternary ammonium salt compounds, polyhexamethylene biguanide hydrochloride and polyhexamethylene guanidine hydrochloride; the proportion of antibacterial agent stock solution used is 0.1% to 1.5% of the product; the water absorbent includes one or more of polyether water absorbent, polyamide water absorbent, fatty acid lipid water absorbent, quaternary ammonium salt water absorbent; the proportion of water absorbent stock solution used is 0.1% to 3% of the product; the softener includes fatty alcohol polyoxyethylene ether and / or polyether modified dimethyl silicone oil softener stock solution used is 0.1% to 5% of the product.

[0056] The fibers mixed in the spray mixing box 20 are finally adsorbed onto the net curtain 18 under the action of the net bottom suction 19 to complete the lamination; the net bottom suction 19 can adjust the suction through wind plates with different mesh holes, and can control the degree of mixing and overlapping of the raw materials in the spray mixing box 20 according to the matching of wind plates with different mesh holes, and can also adjust the forming area of ​​the outer layer chemical fiber in the net curtain 18;

[0057] The temperature of the hot rolling device is set at 90-160°C. The hot rolling mill 21 can realize the rapid switching of the pattern rolls, and can be a "Y" type automatic roll changer, which is divided into working pattern rolls and spare pattern rolls. The spare pattern rolls can be disassembled, assembled, repaired, etc. without stopping the machine, which can minimize the impact on product production.

[0058] The multi-layer composite non-woven material formed by hot rolling is sequentially inspected for appearance defects and gram weight uniformity by an online defect detection device, slitting and winding by a slitting and winding device, and automatically packaged by an automatic transmission and packaging device, ultimately forming a new type of non-woven composite material.

[0059] The present invention also provides a nonwoven composite material, which is made by the above nonwoven composite material preparation device, comprising a first polymer fiber layer, a mixed spray layer, and a second polymer fiber layer arranged in sequence from top to bottom; the first polymer fiber layer and the second polymer fiber layer are mixed by a thermoplastic polymer and a functional masterbatch; the average diameter of the filaments constituting the fiber layer is in the range of 0.1 μm to 20 μm, and the gram weight of each layer is in the range of 0.5 gsm to 15 gsm; and each fiber layer is prepared by a spunbond process or a meltblown process;

[0060] The mixed spray layer is formed by spraying cellulose staple fibers and polymer filaments, the length of the cellulose staple fibers is 0.1 mm to 8 mm, the average diameter of the polymer filaments is in the range of 0.1 μm to 10 μm, and the mass ratio of the cellulose staple fibers to the polymer filaments in the mixed spray layer is 10:90 to 80:20; the mixed spray layer is formed by spraying at least one layer of cellulose staple fibers and polymer filaments.

[0061] In some embodiments, the cellulose short fibers are wood pulp fibers, short-cut cotton fibers, short-cut bamboo fibers, short-cut bamboo pulp fibers, and short-cut viscose fibers, wherein the short-cut cotton fibers are derived from raw cotton, combed cotton waste, and waste cotton textiles crushed and defibrinated recycled cotton, and are obtained through processes such as scouring, bleaching, and cutting; and the bamboo fibers are obtained through a soaking and steaming process;

[0062] The thermoplastic polymer is one or more of polypropylene, polyethylene, polyester, nylon, polyurethane, polylactic acid and thermoplastic biodegradable plastics; the functional masterbatch is one or more of biodegradable masterbatch, hydrophilic masterbatch, soft masterbatch, elastomer masterbatch and antibacterial masterbatch.

[0063] Specifically, the hydrophilic masterbatch preferably includes one or more of polyether hydrophilic masterbatch, polyamide hydrophilic masterbatch and fatty acid lipid hydrophilic masterbatch. In the present invention, the biodegradable masterbatch preferably includes aerobic biodegradable masterbatch and / or anaerobic biodegradable masterbatch. In the present invention, the softening masterbatch preferably includes amide softener masterbatch. In the present invention, the antibacterial masterbatch preferably includes one or more of nano cuprous oxide, nano zinc oxide and silver ion antibacterial agent.

[0064] For ease of understanding, the present invention also provides the following embodiments:

[0065] Example 1

[0066] A novel nonwoven composite material comprises, from top to bottom, a first polypropylene fiber layer, a mixed spray layer, and a second polypropylene fiber layer.

[0067] The first polypropylene fiber layer and the second polypropylene fiber layer are prepared by melt-blowing by mixing polypropylene and hydrophilic masterbatch purchased from Changzhou Wangyi New Material Technology Co., Ltd., with a mass ratio of 96:4; the two fiber layers are respectively located at the top and bottom layers of the middle mixed spray layer, which cover and protect the middle mixed spray layer; the average diameter of the filaments constituting the fiber layer is in the range of 2.5μm, and the gram weight of each layer is 2.5gsm.

[0068] The mixed spray layer has two layers in total, wherein the short fibers are obtained by scouring, bleaching, cutting and other processes of recycled cotton waste fibers, the average fiber length is 4 mm, the polymer filaments are mixed by polypropylene particles and hydrophilic masterbatch in a mass ratio of 96:4, and are spun through a melt-blown system, and the average diameter of the sprayed polymer filaments is 2.9 μm; the mass ratio of polymer filaments to cellulose fibers in the mixed spray layer is 35:65, and the gram weight of each mixed spray layer is 25 gsm, the overall gram weight of the composite material is 55 gsm, and the mixed spray layer is formed by cross-mixing of the polymer fibers and cellulose fibers on the left.

[0069] The equipment for preparing the novel nonwoven composite material includes an opening and mixing device 3, a transmission fan, a feeding amount control device 5, a fiber distribution device 7, a transmission net curtain 8, a transmission pipeline 10, a CD scattering distributor 9, a fiber nozzle 30, a mixed spray box 20, a polymer system, a spray system 17, a receiving net curtain 18, a net bottom suction 19, a hot rolling device, an online defect detection device, a slitting and winding device, and an automatic transmission and packaging device;

[0070] The opening and mixing device 3 places the processed cotton waste fibers in the raw material storage position 2, and the push plate 1 applies auxiliary force to push the raw materials into the opening and mixing device 3 for opening and mixing; the cotton fiber raw materials after opening and mixing enter the feeding amount control device 5 through the driving pipe 4 through the action of the transmission fan;

[0071] The feeding amount control device 5 controls and adjusts the fiber feeding amount by transmitting a signal through the height detection device 23 in the fiber distribution device 7, and can accurately measure and control the amount of raw materials to ensure the quantitative consistency of the product;

[0072] The cotton fibers further enter the flat screen rotor fiber distribution device 7 for the first uniform distribution along the width direction; the distributed fibers are transported to the short fiber transmission channel through the transmission mesh curtain 8, and the fibers pass through the CD scattering distributor 9 configured in the transmission channel to adjust the injection air flow in different areas to perform a second uniformity adjustment on the short fiber distribution.

[0073] The fiber nozzle 30 adjusts the position of the baffle 33 to keep the outlet form of the lower mixed spray layer to discharge from the left channel 31, and the outlet form of the upper mixed spray layer to discharge from the right channel 34. The sprayed noil fibers are mixed with the polymer filaments in the mixed spray box 20, and the mixed cross area is greater than 50%. The main body of the mixed spray box 20 is made of metal, and the two sides of the box are made of high-hardness glass, which makes it easier for production operators to observe the situation in the box.

[0074] The equipment of the novel nonwoven composite material includes four sets of polymer systems, wherein the filaments produced by the first polymer system 11 and the second polymer system 16 constitute the upper fiber and the bottom fiber of the material, the polymer system is a melt-blown production system, the spinneret assembly used is a coaxial melt-blown spinneret assembly, and the number of rows of spinneret holes on the spinneret of the coaxial melt-blown spinneret assembly is eight rows. The third polymer system 12 and the fourth polymer system 13 used for mixing with cellulose staple fibers in the mixed spray box 20 are melt-blown production systems, the spinneret assembly used is a coaxial melt-blown spinneret assembly, and the number of rows of spinneret holes on the spinneret of the coaxial melt-blown spinneret assembly is fourteen rows. And each set of polymer systems is equipped with a separate main and auxiliary material supply system, and each system can operate independently without interfering with each other.

[0075] A spray system 17 is disposed below the first polymer system 11 and the second polymer system 16. After the polymer filaments are ejected, they are cooled by the spray system 17, which can effectively accelerate the cooling of the fibers and improve the strength of the fibers. The spray system 17 is located 45 cm below the spinneret, with an angle of 120° with the ejection direction of the polymer filaments, and a spray volume of 120 L / h for pure water spraying.

[0076] The fibers mixed in the mixing and spraying box 20 are finally adsorbed onto the mesh curtain 18 under the action of the net bottom suction 19, and after the stacking is completed, they are transferred to the hot rolling device for hot rolling;

[0077] The temperature of the hot rolling device is set to 110° C., and the hot rolling pattern is a cat and dog cartoon pattern; the multi-layer composite non-woven material formed by hot rolling is sequentially passed through an online defect detection device for appearance defect and gram weight uniformity detection, a slitting and winding device for slitting and winding, and an automatic transmission and packaging device for automatic packaging, and finally a new type of non-woven composite material is formed;

[0078] Example 2

[0079] A novel nonwoven composite material comprises, from top to bottom, a first polypropylene fiber layer, a mixed spray layer, and a second polypropylene fiber layer. The first polypropylene fiber layer and the second polypropylene fiber layer are prepared by a spunbonding process by mixing polypropylene with a hydrophilic masterbatch purchased from Changzhou Wangyi New Material Technology Co., Ltd. and a soft masterbatch purchased from Yancheng Ruize Masterbatch Co., Ltd., with a mass ratio of 91:4:5; the two fiber layers are respectively located at the top and bottom layers of the middle mixed spray layer, covering and protecting the middle mixed spray layer; the average diameter of the filaments constituting the fiber layer is 4.5 μm, and the gram weight of each layer is 5 gsm.

[0080] The mixed spray layer has two layers in total, wherein the short fibers are obtained from bamboo raw fibers through processes such as scouring, bleaching, and cutting, and the average fiber length is 6 mm. The polymer filaments are spun from polypropylene particles through a melt-blown system, and the average diameter of the sprayed polymer filaments is 3 μm. The mass ratio of polymer filaments to cellulose fibers in the mixed spray layer is 35:65, and the gram weight of each mixed spray layer is 30 gsm. The overall gram weight of the composite material is 70 gsm, and the mixed spray layer is formed by cross-spraying of polymer fibers and cellulose fibers on the left and right sides.

[0081] The opening and mixing device 3 places the processed bamboo raw fibers in the raw material storage position 2, and the push plate 1 applies auxiliary force to push the raw materials into the opening and mixing device 3 for opening and mixing; the opened and mixed cotton fiber raw materials enter the feeding amount control device 5 through the driving pipe 4 through the action of the transmission fan;

[0082] The feeding amount control device 5 controls and adjusts the fiber feeding amount by transmitting a signal through the height detection device 23 in the fiber distribution device 7, and can accurately measure and control the amount of raw materials to ensure the quantitative consistency of the product;

[0083] The cotton fibers further enter the flat screen rotor fiber distribution device 7 for the first uniform distribution along the width direction; the distributed fibers are transported to the short fiber transmission channel through the transmission mesh curtain 8, and the fibers pass through the CD scattering distributor 9 configured in the transmission channel to adjust the injection air flow in different areas to perform a second uniformity adjustment on the short fiber distribution.

[0084] The fiber nozzle 30 adjusts the position of the baffle 33 to keep the outlet form of the lower mixed spray layer in the left, middle and right channels 34. The sprayed cotton fibers and polymer filaments are mixed in the mixed spray box 20, and the mixed cross area is greater than 75%. The main body of the mixed spray box 20 is made of metal, and the two sides of the box are made of high-hardness glass, which makes it easier for production operators to observe the situation in the box.

[0085] The equipment of the novel nonwoven composite material includes six sets of polymer systems, wherein the filaments produced by the first polymer system 11 and the second polymer system 16 constitute the upper fiber and the bottom fiber of the material, and the polymer system is a spunbond production system, obtained after cooling and drawing; the third polymer system 12, the fourth polymer system 13, the fifth polymer system 14, and the sixth polymer system 15 used for mixing with the cellulose staple fibers in the mixing spray box 20 are melt-blown production systems, and the spinneret assembly used is a coaxial melt-blown spinneret assembly, and the number of rows of spinneret holes on the spinneret plate of the coaxial melt-blown spinneret assembly is fourteen rows. And each set of polymer systems is equipped with a separate main and auxiliary material supply system, and each system can operate independently without interfering with each other.

[0086] The fibers mixed in the mixing and spraying box 20 are finally adsorbed onto the mesh curtain 18 under the action of the net bottom suction 19, and after the lamination is completed, they are transmitted to the hot rolling device for hot rolling; the temperature of the hot rolling device is set to 115°C, and the hot rolling pattern is a sesame dot pattern; the multi-layer composite non-woven material formed by hot rolling is sequentially passed through an online defect detection device for appearance defects and gram weight uniformity detection, slitting and winding equipment for slitting and winding, and automatic transmission and packaging device for automatic packaging, and finally a new type of non-woven composite material is formed;

[0087] Example 3

[0088] A novel nonwoven composite material comprises, from top to bottom, a first polypropylene fiber layer, a mixed spray layer, and a second polypropylene fiber layer. The first polypropylene fiber layer and the second polypropylene fiber layer are prepared by mixing polypropylene and hydrophilic masterbatch through a spunbond process, and the mass ratio of the three is 95:5; the two fiber layers are respectively located at the top and bottom layers of the middle mixed spray layer, and play a role in covering and protecting the middle mixed spray layer; the average diameter of the filaments constituting the fiber layer ranges from 2.5 μm, and the gram weight of each layer is 3 gsm.

[0089] The mixed spray layer has a total of two layers, wherein the short fibers are ton-packaging wood pulp fibers with an average fiber length of 1.6 mm, and the polymer filaments are spun from polypropylene particles through a melt-blown system, and the average diameter of the sprayed polymer filaments is 3.5 μm; the mass ratio of polymer filaments to cellulose fibers in the mixed spray layer is 40:60, and the gram weight of each mixed spray layer is 25 gsm, the overall gram weight of the composite material is 56 gsm, and the mixed spray layer is formed by cross-spraying of polymer fibers and cellulose fibers on the left and right sides, and the cross-mixing area is greater than 75%.

[0090] The equipment for preparing the novel nonwoven composite material includes a cotton grabbing device, a cotton mixing device, a fiber distribution device 7, a transmission net curtain 8, a transmission pipeline 10, a CD scattering distributor 9, a fiber nozzle 30, a mixing spray box 20, a polymer system, a spray system 17, a receiving net curtain 18, a net bottom suction 19, a hot rolling device, an online defect detection device, a slitting and winding device, and an automatic transmission and packaging device;

[0091] The opening and mixing device 3 places the processed wood pulp fibers in the raw material storage position 2, and the push plate 1 applies auxiliary force to push the raw materials into the opening and mixing device 3 for opening and mixing; the opened and mixed cotton fiber raw materials are driven by the transmission fan through the transmission pipeline 4 and enter the feeding amount control device 5;

[0092] The feeding amount control device 5 controls and adjusts the fiber feeding amount by transmitting a signal through the height detection device 23 in the fiber distribution device 7, and can accurately measure and control the amount of raw materials to ensure the quantitative consistency of the product;

[0093] The cotton fibers further enter the flat screen rotor fiber distribution device 7 for the first uniform distribution along the width direction; the distributed fibers are transported to the short fiber transmission channel through the transmission mesh curtain 8, and the fibers pass through the CD scattering distributor 9 configured in the transmission channel to adjust the injection air flow in different areas to perform a second uniformity adjustment on the short fiber distribution.

[0094] The fiber nozzle 30 adjusts the position of the baffle 33 to keep the outlet form of the lower mixed spray layer in the left, middle and right channels 34. The sprayed cotton fibers and polymer filaments are mixed in the mixed spray box 20, and the mixed cross area is greater than 75%. The main body of the mixed spray box 20 is made of metal, and the two sides of the box are made of high-hardness glass, which makes it easier for production operators to observe the situation in the box.

[0095] The equipment of the novel nonwoven composite material includes six sets of polymer systems, wherein the filaments produced by the first polymer system 11 and the second polymer system 16 constitute the upper fiber and the bottom fiber of the material, the polymer system is a melt-blown production system, the spinneret assembly used is a coaxial melt-blown spinneret assembly, and the number of rows of spinneret holes on the spinneret of the coaxial melt-blown spinneret assembly is eight rows; the third polymer system 12, the fourth polymer system 13, the fifth polymer system 14, and the sixth polymer system 15 used for mixing with cellulose staple fibers in the mixed spray box 20 are melt-blown production systems, the spinneret assembly used is a coaxial melt-blown spinneret assembly, and the number of rows of spinneret holes on the spinneret of the coaxial melt-blown spinneret assembly is fourteen rows. And each set of polymer systems is equipped with a separate main and auxiliary material supply system, and each system can operate independently without interfering with each other.

[0096] The fibers mixed in the mixing and spraying box 20 are finally adsorbed onto the mesh curtain 18 under the action of the net bottom suction 19, and after the lamination is completed, they are transmitted to the hot rolling device for hot rolling; the temperature of the hot rolling device is set to 115°C, and the hot rolling pattern is a cartoon line pattern; the multi-layer composite non-woven material formed by hot rolling is sequentially passed through the online defect detection device for appearance defect and gram weight uniformity detection, the slitting and winding equipment is used for slitting and winding, and the automatic transmission and packaging device is used for automatic packaging, and finally a new type of non-woven composite material is formed;

[0097] Table 1 Performance test results of the new nonwoven composite materials prepared in Examples 1 to 3

[0098]

[0099] It can be seen from the data in Table 1 that the longitudinal strength of the new non-woven composite material provided by the present invention can be maintained at more than 15N, the transverse strength can be maintained at more than 8N, the water absorption time is less than 16s, the water absorption rate is more than 700%, and the lint coefficient is less than 4.5, which means that the present invention can use the multi-fiber mixed jet web forming method to make good use of ultra-short fibers such as cotton wool with a fiber length of less than 8mm, recycled cotton, bamboo fiber, ton-bag bulk wood pulp fiber, etc. without the need to prepare the raw materials into plates or coils, and the wiping material has good strength, water absorption performance, and anti-lint performance.

[0100] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A mixed spray layer preparation device, characterized in that: include: An opening and mixing device, a driving device, a feeding amount control device, a fiber distribution device, a conveying component, a mixing and spraying box and a polymer system, wherein the opening and mixing device is used for opening and mixing raw materials; the driving device is used for driving the fibers discharged from the opening and mixing device to the feeding amount control device and feeding the fibers into the fiber distribution device through the feeding amount control device; the fiber distribution device is provided with a height detection device, and the height detection device is used for detecting whether the height of the raw materials in the fiber distribution device exceeds a set threshold value; when the height of the raw materials in the fiber distribution device is lower than the set threshold value, the controller controls the feeding amount control device to feed the raw materials to the fiber distribution device; when the height of the raw materials in the fiber distribution device is not lower than the set threshold value, the controller controls the feeding amount control device to stop feeding the raw materials to the fiber distribution device; the fiber distribution device can distribute the fibers along the width direction and discharge the distributed fibers through the discharge port; the conveying component conveys the fibers discharged from the discharge port of the fiber distribution device to the mixing and spraying box; the polymer system is used for producing polymer filaments and spraying the polymer filaments into the mixing and spraying box.

2. The mixed spray layer preparation device according to claim 1, characterized in that: The conveying assembly includes a vertically arranged transmission pipe and a horizontally arranged transmission mesh curtain. The bottom of the transmission pipe extends into the mixing spray box from the top of the mixing spray box. The fibers discharged from the discharge port of the fiber distribution device are transported to the transmission pipe through the transmission mesh curtain. The bottom structure of the transmission pipe is constructed as a fiber nozzle. A CD scattering distributor is integrated on the transmission pipe. The CD scattering distributor includes a plurality of airflow nozzles arranged in sequence along the width direction. The gas injection direction of the airflow nozzle is downward. The flow rate of fibers at different width positions is adjusted by controlling the injection flow rate of each airflow nozzle.

3. The mixed spray layer preparation device according to claim 2, characterized in that: The spraying direction of the fiber nozzle is adjustable.

4. The mixed spray layer preparation device according to claim 3 is characterized in that: The fiber nozzle includes two outer plates arranged in sequence along the length direction, the length direction is perpendicular to the width direction, the two outer plates are inclined in opposite directions from top to bottom, two baffles are arranged between the two outer plates, the two baffles are arranged in sequence along the length direction, the two baffles are parallel, the two baffles are movably arranged, the two baffles are driven to move by a baffle driving device, and the top edges of the two baffles are not lower than the top edges of the two outer plates.

5. The mixed spray layer preparation device according to claim 4, characterized in that: An inclined plate is fixedly arranged on one side of the two baffles which are away from each other, and the two inclined plates are respectively parallel to the two outer plates.

6. The mixed spray layer preparation device according to claim 1, characterized in that: The fiber distribution device is a flat screen rotor type forming head or a dust cage type forming head, and the fiber distribution is adjusted by controlling the relative rotation speed of the agitators at various locations in the flat screen rotor type forming head.

7. The mixed spray layer preparation device according to claim 1, characterized in that: A raw material storage position and a push plate are provided on the front side of the feed inlet of the opening and mixing device. The raw material storage position is used to place raw materials, and the push plate is used to push the raw materials on the raw material storage position toward the feed inlet of the opening and mixing device.

8. A nonwoven composite material preparation device, characterized in that: include: A negative pressure mesh curtain assembly, a first polymer system, a mixed spray layer preparation device according to any one of claims 1 to 7, a second polymer system and a hot rolling mill; The negative pressure mesh curtain assembly includes a mesh curtain and a negative pressure device for making the working surface of the mesh curtain in a negative pressure state. The filament injection head of the first polymer system, the mixing spray box and the filament injection head of the second polymer system are arranged in sequence directly above the mesh curtain along the transmission direction of the mesh curtain, and the hot rolling mill is arranged on one side of the tail of the mesh curtain.

9. A nonwoven composite material, characterized in that: Made by the nonwoven composite material preparation device according to claim 8, comprising a first polymer fiber layer, a mixed spray layer, and a second polymer fiber layer arranged in sequence from top to bottom; the first polymer fiber layer and the second polymer fiber layer are mixed by a thermoplastic polymer and a functional masterbatch; the average diameter of the filaments constituting the fiber layer is in the range of 0.1 μm to 20 μm, and the gram weight of each layer is in the range of 0.5 gsm to 15 gsm; and each fiber layer is prepared by a spunbond process or a meltblown process; The mixed spray layer is formed by spraying cellulose staple fibers and polymer filaments, the length of the cellulose staple fibers is 0.1 mm to 8 mm, the average diameter of the polymer filaments is in the range of 0.1 μm to 10 μm, and the mass ratio of the cellulose staple fibers to the polymer filaments in the mixed spray layer is 10:90 to 80:20; the mixed spray layer is formed by spraying at least one layer of the cellulose staple fibers and the polymer filaments.

10. The nonwoven composite material according to claim 9, characterized in that: The cellulose short fibers are wood pulp fibers, short-cut cotton fibers, short-cut bamboo fibers, short-cut bamboo pulp fibers, and short-cut viscose fibers, wherein the short-cut cotton fibers are derived from raw cotton, combed cotton waste, and waste cotton textiles, and are crushed, defibrinated, and recycled cotton, and are obtained through processes such as scouring, bleaching, and cutting; the short-cut bamboo fibers are obtained through a soaking and steaming process; The thermoplastic polymer is one or more of polypropylene, polyethylene, polyester, nylon, polyurethane, polylactic acid and thermoplastic biodegradable plastics; the functional masterbatch is one or more of biodegradable masterbatch, hydrophilic masterbatch, soft masterbatch, elastomer masterbatch and antibacterial masterbatch.

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