Melt-blown PP sound-absorbing cotton production equipment and production method thereof

Abstract

The invention discloses melt-blown PP sound-absorbing cotton production equipment and a production method thereof.The melt-blown PP sound-absorbing cotton production equipment comprises a PP particle feeding area, a PP fiber feeding area and a mixing area, the mixing area is located below the PP particle feeding area and located on one side of the PP fiber feeding area and used for receiving and mixing raw materials of the PP particle feeding area and the PP fiber feeding area; the heat treatment area is arranged on one side of the mixing area and used for carrying out hot melting curing treatment on mixed materials output by the mixing area, the cutting area is arranged on one side of the heat treatment area, the wedge-shaped flow guide cavity gathers fibers to prevent drifting away, the flow guide piece is driven by the swing mechanism to reciprocate, the limitation of fixed spinning is broken through, the mixing uniformity is improved, and the production efficiency is improved. The heat treatment area is matched with the post-treatment assembly, it is ensured that materials are fully cured, processing can be conducted according to needs, the cloth covering or embossing process is achieved, pp homogeneous raw materials are adopted, compatibility is good, the waste recycling rate is high, and the product performance, stability and resource utilization rate are improved.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of melt-blown PP cotton production, in particular to a melt-blown PP sound-absorbing cotton production equipment and a production method thereof. BACKGROUND

[0002] Melt-blown PP cotton is a kind of ultra-fine fiber non-woven fabric material produced by using polypropylene as raw material through melt-blown method. The production process is to melt the polypropylene raw material, blow it through high-speed hot air flow, stretch the melt stream to form extremely fine fibers, and then agglomerate the fibers into a fiber web on a receiving device. Finally, it is reinforced into a cotton-like material through self-bonding or thermal bonding.

[0003] The traditional melt-blown PP cotton processing technology usually adopts a PET and PP mixed composite structure. PET and PP are different polymers with large differences in molecular structure. After mixing, the compatibility is poor, and during the hot melt solidification process, problems such as delamination and poor bonding are prone to occur. In addition, due to the different qualities of raw materials, the molecular chains of waste materials generated during production are difficult to fuse during hot melt granulation recycling, the performance of recycled materials is unstable, the recycling rate is low, which not only causes resource waste but also increases production cost. Moreover, when spraying PP fiber, it is usually sprayed in a fixed area, which cannot achieve uniform spreading, making the mixed PP particles and other raw materials uneven, affecting the stability of product quality, and local defects are prone to occur in subsequent processing. SUMMARY

[0004] The technical solution of the present application solves the technical problem that the prior art solution is too single. It mainly provides a melt-blown PP sound-absorbing cotton production equipment and a production method thereof to solve the technical problems of the traditional melt-blown PP cotton processing technology using a PET and PP mixed composite structure, poor compatibility due to large differences in molecular structure between the two, hot melt solidification delamination, poor bonding, and different qualities of raw materials making it difficult to fuse molecular chains during waste material recycling, low recycling rate, and uneven mixing caused by fixed area spraying of PP fiber, affecting product processing technology.

[0005] The technical solution adopted by the present application to solve the above technical problems is: a melt-blown PP sound-absorbing cotton production equipment, comprising: a PP particle feeding area and a PP fiber feeding area, further comprising: a mixing area below the PP particle feeding area and on one side of the PP fiber feeding area, for receiving raw materials from the PP particle feeding area and the PP fiber feeding area and mixing them.

[0006] a heat treatment area on one side of the mixing area, for hot melt solidification treatment of the mixed material output from the mixing area.

[0007] a cutting area on one side of the heat treatment area, for cutting the solidified material from the heat treatment area.

[0008] A heating screw conveyor, which is a component of the PP particle feeding area, is arranged above the PP particle feeding area and is used to heat and melt the PP particles into a fluid.

[0009] A filter, which is connected between the discharge end of the heating screw conveyor and the feeding end of the storage tank, is used to filter the molten fluid output by the heating screw conveyor.

[0010] A storage tank, which is connected below the filter, is used to store the filtered molten fluid and maintain its flow state.

[0011] A flow guide, which is arranged below the storage tank and directly above the mixing area, is used to guide the directional flow of the raw material output by the storage tank to the mixing area.

[0012] A swing mechanism, which is arranged on one side of the storage tank and rotationally connected to the flow guide, is used to drive the flow guide to swing back and forth in the horizontal direction to uniformly distribute the raw material to the mixing area.

[0013] Further, the PP fiber feeding area includes an unpacking machine, a four-roll opener, a carding machine, and a cross-laying machine. A belt conveyor is arranged between the unpacking machine and the four-roll opener to convey the PP fiber bundle after the unpacking machine to the feeding port of the four-roll opener. A chain plate conveyor is arranged between the four-roll opener and the carding machine to convey the fiber bundle after the four-roll opener to the feeding end of the carding machine.

[0014] Further, the mixing area includes horizontally arranged and oppositely rotating rollers. The flow guide is arranged directly above one of the rollers. A fan is arranged in the roller. The surface of the roller is provided with micro-holes. The fan and the micro-holes form a suction structure to guide the distribution of the raw material output by the storage tank. Tension rollers are arranged between the roller on one side and the cross-laying machine and between the heat treatment area and the cutting area.

[0015] Further, the heat treatment area includes vertically arranged and oppositely rotating rollers. Heating rods are arranged in the rollers. The surface of the upper roller is coated with an anti-sticking layer to prevent fiber sticking. The heat treatment area and the mixing area are provided with a post-processing assembly. The post-processing assembly includes a chain plate conveyor, an embossing roller set or a cloth covering roller set, and a cloth releasing roller. The embossing roller set or the cloth covering roller set is fixed above the chain plate conveyor by a pneumatic cylinder. The cloth releasing roller is arranged between the chain plate conveyor and the mixing area.

[0016] Further, the storage tank includes inner and outer layers made of metal. Independent cavities for mounting annular heating pipes are arranged between the inner and outer layers. A high-temperature-resistant stirring member is rotationally connected inside the storage tank. A temperature sensor is arranged inside the tank. A flow guide cone is arranged at the bottom of the storage tank. One end of the flow guide cone, which is of a gradual profile, is detachably connected to a mounting base. A spinneret is detachably connected to the bottom of the mounting base.

[0017] Further, the mounting base and the spinneret are closely fitted, the mounting base and the spinneret surface are distributed with a plurality of corresponding and mutually penetrating micro-hole structures for discharging fluid, the spinneret bottom two ends are fixedly connected with nozzles corresponding to the micro-hole structure position, the nozzles are distributed downward at an angle of 15-30°, and the nozzles are connected with one side of the wind box on the side of the swing mechanism through pipelines, the inside of the wind box is provided with a heating rod, and the other side of the wind box is connected with a Roots blower through pipelines.

[0018] Further, the swing mechanism includes an upper support seat and a lower support seat, the inside of the upper support seat is rotatably connected with a driving gear and a driven gear connected with each other, the outside of the upper support seat is rotatably connected with a balance connected coaxially with the driven gear, the surface of the balance is fixedly provided with a pin, and the balance is provided with a rocker at a position spaced from the surface thereof, and the surface of the rocker is provided with a first slotted groove matched with the pin.

[0019] Further, the lower support seat is penetrated by a sliding rod, the middle of the sliding rod is fixedly provided with a guide block, springs are wound on the surface of the sliding rod at both ends corresponding to the guide block, one end of the guide block is movably connected to the second slotted groove of the rocker close to the lower side, the top of the rocker is rotatably connected with the upper support seat, and the rocker is provided with a connecting piece between the first slotted groove and the second slotted groove, and the connecting piece is fixedly connected with a flow guide piece.

[0020] Further, the flow guide piece is in the shape of a trapezoidal structure with a narrow lower part, and a wedge-shaped flow guide cavity is formed in the inside of the flow guide piece, the cavity wall is inclined, and forms a fiber filament guide channel with the through hole at the bottom, for guiding the directional flow of the fiber filaments, and the flow guide piece is externally sleeved on the spinneret assembly composed of the mounting base and the spinneret.

[0021] A melt-blown PP sound-absorbing cotton production equipment and a production method thereof, the method specifically includes the following steps: Step 1: After the PP fibers of 3dtex-7dtex specifications are filtered, they are fluffed by the opening machine in the PP fiber feeding area, and then conveyed to the four-roller opener inlet by the belt conveyor. The fiber mass after the four-roller opener treatment is conveyed to the carding machine inlet by the chain conveyor. After being carded into single filaments by the carding machine, the filaments are output by the stripping roller and then enter the cross-laying machine. The filaments are cross-laid by the upper and lower guide net components to form a three-dimensional fiber web, and a PP fiber skeleton layer is formed. At the same time, the filtered PP particles are fed into the heating screw conveyor through the conveying pipe. The heating screw conveyor is divided into three heating sections. The first section is set to 200°C to preliminarily soften the PP particles. The second section is set to 230°C to accelerate the melting process of the particles. The third section is set to 250°C to ensure uniform and stable melting. The PP particles are heated and melted into a fluid in the heating screw conveyor. After being filtered by the metal sintered filter element, the fluid is collected in the storage tank.

[0022] Step 2: The stirring element in the storage tank cooperates with the annular heating pipe and the temperature sensor to maintain the fluid temperature at 250-280°C to prevent solidification. The molten fluid is collected in the installation base through the flow guide pipe provided with a flow meter and an electromagnetic valve, and finally discharged from the spinneret micropores in a viscous flow state.

[0023] Step 3: The nozzle is supplied with air by the Roots blower and heated to a high-speed hot gas flow of 180-220°C by the heating rod in the air tank. The viscous flow fluid generates shear force with the high-speed hot gas flow, and the fiber filaments are stretched. The fiber filaments contact the ambient air, and the temperature difference causes them to cool rapidly below the melting point, resulting in crystallization and solidification.

[0024] Step 4: The fiber filaments are collected in the flow guide cavity. At this time, the driving gear drives the driven gear to rotate the balance wheel. Through the cooperation of the pin and the rocker's sliding groove, the flow guide moves reciprocally above the mixing area roller.

[0025] Step 5: The PP fiber skeleton layer is drawn to the surface of the roller by the tensioning roller group, and the fiber filaments are laid on the reciprocating flow guide to achieve mixing. The mixed material enters the heat treatment area through the mixing area. The upper roller in the heat treatment area is provided with an anti-sticking layer. The thickness and flatness are controlled by adjusting the gap between the upper and lower rollers.

[0026] Step 6: When the coating process is selected, the homogeneous non-woven fabric on the surface of the cloth release roller is released by the driving motor. The cloth release roller group is lowered by the air cylinder to heat and melt the fabric. When the embossing process is selected, the embossing roller group is lowered by the air cylinder to heat and press the material surface, so that the pattern is embedded in the surface layer of the material and solidified.

[0027] Step 7: The raw material after the cloth covering / embossing forming is pulled by the tension roller group to the cutting zone, and is cut into sheets according to the specifications by a numerical control cutting machine. The cut sheets are uniformly collected and transported to the stamping equipment. After the waste is collected, it can be recycled by hot melting and granulation at 200-230 DEG C.

[0028] Compared with the prior art, the application has the following advantages: 1. The cooperative structure of the flow guide and the swing mechanism in the application has the effect of guiding the directional flow of the fiber filaments and achieving uniform spreading in a large range. The wedge-shaped flow guide cavity of the flow guide can gather the fiber filaments and avoid scattering. The swing mechanism drives the flow guide to move back and forth left and right through gear transmission and rocker swing, breaks the limitations of fixed area spinning, and can improve the uniformity of the mixing of the raw material converted from PP particles to fiber filaments and the PP fiber skeleton layer, laying a good foundation for subsequent hot melting and solidification.

[0029] 2. The application also has a heat treatment zone and a post-processing assembly arranged in the heat treatment zone and the mixing zone. The heat treatment zone has the effect of fully hot melting and solidifying the mixed material. The upper and lower vertical heating rollers cooperate with the anti-sticking layer to ensure the flat solidification of the material. The embossing or cloth covering roller group of the post-processing assembly can be adjusted by the air cylinder to achieve pattern hot pressing or non-woven fabric compounding as needed.

[0030] 3. The flow guide realizes uniform mixing of the material by means of the swing mechanism, which can make the fiber filaments and the PP fiber skeleton layer more fully hot melt and solidify in the heat treatment zone, and the stress is more uniform, reducing the phenomenon of local non-solidification or over-solidification. The stable heating and processing of the heat treatment zone can effectively fix the raw material formed in the mixing zone, ultimately improving the overall performance of the melt-blown PP sound-absorbing cotton, and using the same raw material of pp fiber and pp particle, the molecular structure is similar, the compatibility is better after mixing, at the same time, when the waste is recycled by hot melting and granulation at 200-230 DEG C, the molecular chain fusion is more smooth, the recovery rate is greatly improved, and the overall performance, quality stability and resource utilization rate of the melt-blown PP sound-absorbing cotton are ultimately improved.

[0031] The application will be explained in detail below in combination with the drawings and specific examples. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a side view structure schematic diagram of the application; Figure 2 It is a main view structure schematic diagram of the PP particle feeding area of the application; Figure 3 It is a cross-sectional structure schematic diagram of the flow guide of the application; Figure 4 It is a structure schematic diagram of the swing mechanism of the application; Mark in the figure: 1, PP particle feeding area; 2, PP fiber feeding area; 3, mixing area; 4, heat treatment area; 5, cutting area; 6, heating screw conveyor; 7, filter; 8, storage tank; 801, flow guide cone; 802, mounting base; 803, spinneret; 804, nozzle; 9, flow guide; 10, swing mechanism; 1001, upper support seat; 1002, lower support seat; 1003, driving gear; 1004, driven gear; 1005, balance wheel; 1006, rocker; 1007, pin; 1008, guide block; 11, air bellow; 12, tension roller set; 13, post-processing assembly. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings, which show several embodiments of the present application. However, the present application can be implemented in different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are for purposes of illustration and description only.

[0035] Please refer to the drawings Figures 1-4 A melt-blown PP sound-absorbing cotton production equipment, comprising: a PP particle feeding area 1 and a PP fiber feeding area 2, further comprising: A mixing area 3 below the PP particle feeding area 1 and on one side of the PP fiber feeding area 2, for receiving raw materials from the PP particle feeding area 1 and the PP fiber feeding area 2 and mixing them.

[0036] A heat treatment area 4 on one side of the mixing area 3, for heat melting and solidifying the mixed materials output from the mixing area 3.

[0037] A cutting area 5 on one side of the heat treatment area 4, for cutting the solidified materials from the heat treatment area 4.

[0038] A heating screw conveyor 6, which is a component of the PP particle feeding area 1, above the PP particle feeding area 1, for heating and melting the PP particles into a fluid.

[0039] A filter 7 connected between the discharge end of the heating screw conveyor 6 and the feed end of the storage tank 8, for filtering the molten fluid output from the heating screw conveyor 6.

[0040] A storage tank 8 is connected below the filter 7 for storing the filtered molten fluid and maintaining its flow state.

[0041] A flow guide 9 is located below the storage tank 8 and directly above the mixing area 3 for guiding the directional flow of the raw material output by the storage tank 8 to the mixing area 3.

[0042] A swing mechanism 10 is located on one side of the storage tank 8 and rotationally connected with the flow guide 9 for driving the flow guide 9 to reciprocally swing left and right in the horizontal direction to uniformly spread the raw material to the mixing area 3.

[0043] In this embodiment, as shown in Figure 1 , the PP fiber feeding area 2 includes an unpacking machine, a four-roller opener, a carding machine, and a cross-laying machine. A belt conveyor is arranged between the unpacking machine and the four-roller opener for conveying the PP fiber mass after the unpacking machine to the feeding port of the four-roller opener. A chain plate conveyor is arranged between the four-roller opener and the carding machine for conveying the fiber mass after the four-roller opener to the feeding end of the carding machine.

[0044] Through the above structure, the multiple sets of equipment in the PP fiber feeding area 2 are coordinated to form an efficient and continuous fiber processing flow. First, the unpacking machine can break the PP fiber agglomeration to improve the uniformity of subsequent processing. The four-roller opener can further decompose the fiber mass and separate impurities. The carding machine can comb the fiber into single filaments and remove metal impurities and dust through the cooperation of the cylinder clothing and the stripping roller to ensure the purity of the fiber. The cross-laying machine can realize the cross-laying of the fiber through the upper and lower guide net components to form a three-dimensional net structure, which provides high-quality base material for the subsequent formation of the skeleton layer, effectively improving the quality and efficiency of the PP fiber pretreatment.

[0045] In this embodiment, as shown in Figure 1 , the mixing area 3 includes horizontally arranged and relatively rotating rollers, the flow guide 9 is located directly above one of the rollers, a fan is arranged in the roller, and micro-holes are opened on the surface of the roller to form a suction structure with the fan for guiding the spreading of the raw material output by the storage tank 8. Tension roller groups 12 are arranged between the side roller and the cross-laying machine and between the heat treatment area 4 and the cutting area 5.

[0046] Through the above structure, the horizontally relatively rotating rollers can provide a stable material receiving and transmission platform. The suction structure formed by the fan in the roller and the micro-holes on the surface can precisely guide the spreading of the fiber filaments output by the storage tank 8 through negative pressure adsorption. The flow guide 9 located directly above the roller can guide the fiber filaments for the second time, further optimizing the spreading trajectory. The tension roller groups 12 arranged between the roller and the cross-laying machine, the heat treatment area 4 and the cutting area 5 can adjust the material tension in real time to prevent the material from relaxing or breaking, ensuring the stability and continuity of the material transmission in the entire production process.

[0047] In this embodiment, as shown in Figure 1 The heat treatment zone 4 includes vertically arranged upper and lower rollers and is relatively rotatable, heating rods are arranged in the rollers, the surface of the upper roller is coated with an anti-sticking layer for preventing fiber sticking, and the heat treatment zone 4 is provided with a post-processing assembly 13 with the mixing zone 3, the post-processing assembly 13 includes a chain plate conveyor, an embossing roller set or a cloth covering roller set and a cloth releasing roller, the embossing roller set or the cloth covering roller set is fixed above the chain plate conveyor by a pneumatic cylinder, and the cloth releasing roller is located between the chain plate conveyor and the mixing zone 3.

[0048] Through the above structure, the vertically arranged heating rollers are uniformly heated by the internal heating rods, and the relative rotation can fully heat melt and solidify the mixed material. The anti-sticking layer on the surface of the upper roller can effectively prevent fiber sticking and ensure smooth conveying of the material. The chain plate conveyor in the post-processing assembly 13 can receive and transport the material, and the embossing roller set or the cloth covering roller set is adjusted up and down by the pneumatic cylinder, which is convenient for selecting hot embossing patterns or covering non-woven fabrics according to requirements. The integration of heating, solidification and post-processing functions not only ensures the quality of the heat melting and forming of the material, but also flexibly expands the functional processing.

[0049] In this embodiment, as shown in Figure 2 and Figure 3 The storage tank 8 includes inner and outer layers of metal material, and a separate cavity is arranged between the inner and outer layers for mounting an annular heating pipe. A high-temperature resistant stirring element is rotatably connected inside the storage tank 8, and a temperature sensor is arranged in the tank body. A flow guide cone pipe 801 is arranged at the bottom of the storage tank 8, one end of the flow guide cone pipe 801 in a gradual profile is detachably connected with a mounting base 802, and the mounting base 802 at the bottom is detachably connected with a spinneret plate 803.

[0050] Through the above structure, the double-layer structure of the storage tank 8, combined with the temperature sensor, realizes constant temperature control of 250-280℃, effectively prevents fluid solidification, and the internal high-temperature resistant stirring element ensures uniform mixing of the molten fluid by rotation, avoiding local overheating or solidification. The gradual profile of the flow guide cone pipe 801 at the bottom, the detachable mounting base 802 and the spinneret plate 803 cooperate to not only facilitate smooth discharge of the fluid, but also quickly replace different specifications of the spinning assembly according to production requirements, improving the flexibility and practicality of the equipment. The storage tank 8 is provided with a pressure detector and a pressure relief port with a solenoid valve, ensuring the safety and stability of the PP particle processing process.

[0051] In this embodiment, as shown in Figure 3As shown, the mounting base 802 and the spinneret 803 are closely fitted, the mounting base 802 and the spinneret 803 are distributed with a plurality of corresponding and mutually penetrating micro-hole structures for discharging fluid, the spinneret 803 is fixedly connected with the nozzles 804 at both ends of the bottom corresponding to the micro-hole structure positions, the nozzles 804 are distributed downward at an angle of 15-30°, and the nozzles 804 are connected with one side of the bellows 11 provided on one side of the swing mechanism 10 through a pipeline, the inside of the bellows 11 is provided with a heating rod, and the other side of the bellows 11 is connected with the Roots blower through a pipeline, and the first buffer baffle is arranged at both ends of the mounting base 802, and the second buffer baffle is fixedly arranged at both ends of the inner wall of the flow guide 9 through springs, when the flow guide 9 reciprocates, the second buffer baffle will be in contact with the first buffer baffle, which can effectively buffer the rigid collision with the spinning area.

[0052] Through the above structure, the penetrating micro-hole structure (0.5mm) corresponding to the surface of the mounting base 802 and the spinneret 803 ensures uniform discharge of the molten fluid, and the closely fitted design avoids fluid leakage and ensures discharge stability; the angle of the nozzle 804 can form a shearing angle between the high-speed hot gas flow and the viscous flow PP fluid discharged from the spinneret 803, which can not only ensure the effective stretching of the fluid stream by the gas flow, but also guide the stretched fiber filament to the bottom of the flow guide cavity of the flow guide 9.

[0053] In this embodiment, as shown in the figure, Figure 4 The swing mechanism 10 includes an upper support seat 1001 and a lower support seat 1002, the driving gear 1003 and the driven gear 1004 are rotatably connected inside the upper support seat 1001 and are connected with each other, the balance wheel 1005 is rotatably connected outside the upper support seat 1001 and is coaxially arranged with the driven gear 1004, the pin 1007 is fixedly arranged on the surface of the balance wheel 1005, the rocker 1006 is arranged at a position spaced from the surface of the balance wheel 1005, and the first strip-shaped sliding groove is arranged on the surface of the rocker 1006 and is matched with the pin 1007.

[0054] Through the above structure, the meshing transmission of the driving gear 1003 and the driven gear 1004 drives the balance wheel 1005 to stably rotate, and then the cooperation of the pin 1007 on the surface of the balance wheel 1005 and the first strip-shaped sliding groove of the rocker 1006 converts the circular motion into the reciprocating swing of the rocker 1006, and further drives the flow guide 9 to swing left and right above the mixing area 3, so that the granular raw material after drawing is no longer limited to the fixed area spinning, but is uniformly spread in a large range with the swing of the flow guide 9.

[0055] In this embodiment, as shown in the figure, Figure 4As shown, the slide rod is provided between the lower support seat 1002, the middle of the slide rod is fixed with a guide block 1008, and the surface of the slide rod is wound with a spring at both ends corresponding to the guide block 1008, one end of the guide block 1008 is movably connected to the second slide groove close to the lower side of the rocker 1006, the top of the rocker 1006 is rotatably connected with the upper support seat 1001, and the rocker 1006 is provided with a connecting piece between the first slide groove and the second slide groove, and is fixedly connected with the flow guide piece 9 through the connecting piece.

[0056] Through the above structure, when the rocker 1006 swings left and right, the guide block 1008 drives the slide rod to slide synchronously between the lower support seat 1002, when the guide block 1008 touches the springs at both ends, the springs can absorb the swing impact force through elastic deformation, so that the reciprocating motion of the flow guide piece 9 is smoother, and the sudden change of swing speed caused by rigid impact is avoided, and the spring rebound force can also assist the guide block 1008 to reset, ensuring that the swing angle of the rocker 1006 matches the spreading track of the flow guide piece 9, and further improving the uniformity of the mixed material in the mixing area 3.

[0057] In this embodiment, as shown in Figure 3 and Figure 4 The flow guide piece 9 has a trapezoidal structure with a narrow top and a wide bottom, and a wedge-shaped flow guide cavity is formed in the inside of the flow guide piece 9, the cavity wall is inclined, and forms a fiber filament guide channel with the bottom through hole, which is used to guide the directional flow of the fiber filament, and the flow guide piece 9 is sleeved outside the spinning assembly composed of the mounting base 802 and the spinneret plate 803.

[0058] Through the above structure, the inclined cavity wall of the flow guide piece 9 and the fiber filament guide channel formed with the bottom through hole can efficiently gather and directionally guide the fiber filament output by the spinning assembly, avoid the fiber filament from scattering and drifting, and ensure its flow to the mixing area 3, which can fully receive the fiber filament discharged from the spinneret plate 803, and then gradually narrow the fiber filament through the wedge-shaped cavity wall, so that the fiber filament is finally output in order through the bottom through hole. When the swing mechanism 10 cooperates, it can further improve the spreading consistency of the fiber filament on the PP fiber skeleton layer, and lay a good foundation for forming high-quality sound-absorbing cotton through subsequent hot melting and solidification.

[0059] A melt-blown PP sound-absorbing cotton production equipment and its production method, specifically including the following steps: Step 1: After the PP fibers of 3dtex-7dtex specifications are filtered, they are fed into the four-roller opener through the belt conveyor after being fluffed by the opener in the PP fiber feeding area 2. The fiber mass after being processed by the four-roller opener is then fed into the carding machine through the chain conveyor. After being carded by the carding machine, the fibers are output to the cross-lapper through the stripping roller. The fibers are then cross-laid by the upper and lower guide net components to form a three-dimensional fiber web, and a PP fiber skeleton layer is formed. At the same time, the filtered PP particles are fed into the heated screw conveyor 6 through the conveying pipe. The heated screw conveyor 6 is divided into three sections, with the first section set to 200℃, mainly for softening the PP particles; the second section is set to 230℃ to accelerate the melting process of the particles; and the third section is set to 250℃ to ensure uniform and stable melting. The melted PP particles are then filtered by the metal sintered filter element of the filter 7 and then collected in the storage tank 8.

[0060] Step 2: The stirring element in the storage tank 8 cooperates with the annular heating pipe and the temperature sensor to maintain the temperature of the fluid at 250-280℃ to prevent solidification. The molten fluid is then collected in the installation base 802 through the flow guide pipe 801 provided with a flow meter and an electromagnetic valve, and finally discharged from the spinneret 803 micro-holes in a viscous flow state.

[0061] Step 3: The nozzle 804 is supplied with high-speed hot air heated to 180-220℃ by the Roots blower and the heating rod in the air tank 11, which generates shear force with the viscous fluid to stretch the fiber into a filament. The filament contacts the ambient air, and the temperature difference causes it to cool rapidly below the melting point, resulting in crystallization and solidification.

[0062] Step 4: The fiber filament is collected in the guide cavity of the guide 9. At this time, the driving gear 1003 drives the driven gear 1004 to rotate the balance wheel 1005. Through the cooperation of the pin 1007 and the sliding groove of the rocker 1006, the guide 9 reciprocates above the roller in the mixing area 3.

[0063] Step 5: The PP fiber skeleton layer is drawn to the surface of the roller by the tensioning roller group 12, and the fiber filament is laid on it by the reciprocating guide 9 to achieve mixing. The mixed material enters the heat treatment area 4 through the mixing area 3 and is hot-melted and solidified by the 170-200℃ heated roller. At the same time, the upper roller in the heat treatment area 4 is provided with an anti-sticking layer, and the thickness and flatness are controlled by adjusting the gap between the upper and lower rollers.

[0064] Step 6: When the cloth covering process is selected, the homogeneous non-woven fabric on the surface of the cloth release roller is released by the driving motor and fed into the chain conveyor. The cloth covering roller group is lowered by the air cylinder to hot-melt and bond. When the embossing process is selected, the embossing roller group is lowered by the air cylinder to embed the pattern into the surface layer of the material and solidify it.

[0065] Step 7: the raw material after the cloth covering / embossing forming is pulled by the tension roller group 12 to the cutting zone 5, and is cut into sheets according to the specifications by a numerical control cutting machine. The cut sheets are uniformly collected and transported to the stamping equipment, and are formed by a stamping die. The waste is collected and can be hot-melt granulated and recycled at 200-230°C.

[0066] The application is described above by way of example with reference to the accompanying drawings. It is apparent that the specific implementation of the application is not limited to the above-described manner, and any non-essential improvement or direct application of the inventive concept and technical solution to other occasions is within the protection scope of the application.

Claims

1. A production equipment for meltblown PP sound-absorbing cotton, comprising: The PP particle feeding zone (1) and the PP fiber feeding zone (2) are characterized in that they further include: The mixing zone (3) is located below the PP particle feeding zone (1) and on one side of the PP fiber feeding zone (2). It is used to receive the raw materials from the PP particle feeding zone (1) and the PP fiber feeding zone (2) and to achieve mixing. The heat treatment zone (4) is located on one side of the mixing zone (3) and is used to perform heat-melt curing treatment on the mixture output from the mixing zone (3); Cutting section (5) is located on one side of the heat treatment zone (4) and is used to cut the material after the heat treatment zone (4) has been cured. The heated screw conveyor (6) is a component of the PP particle feeding zone (1) and is located above the PP particle feeding zone (1). It is used to heat and melt the PP particles into a fluid. The filter (7) is connected between the discharge end of the heated screw conveyor (6) and the inlet end of the storage tank (8) to filter the molten fluid output by the heated screw conveyor (6); Storage tank (8), connected below filter (7), is used to store the filtered molten fluid and maintain its flow state; The guide (9) is located below the storage tank (8) and directly above the mixing zone (3) to guide the raw material output from the storage tank (8) to flow directionally to the mixing zone (3). The swing mechanism (10) is located on one side of the storage tank (8) and is rotatably connected to the guide (9). It is used to drive the guide (9) to swing back and forth in the horizontal direction so as to evenly distribute the raw materials to the mixing zone (3).

2. The meltblown PP sound-absorbing cotton production equipment according to claim 1, characterized in that: The PP fiber feeding area (2) includes a pack opener, a four-roll opener, a carding machine and a cross-laying machine. A belt conveyor is provided between the pack opener and the four-roll opener to transport the PP fiber bundles after the pack opener has been fluffed to the feed port of the four-roll opener. A chain conveyor is provided between the four-roll opener and the carding machine to transport the fiber bundles after the four-roll opener has been processed to the feed end of the carding machine.

3. The meltblown PP sound-absorbing cotton production equipment according to claim 1, characterized in that: The mixing zone (3) includes horizontally arranged and relatively rotating rollers. The guide (9) is located directly above one of the rollers. A fan is installed inside the roller. Microholes are opened on the surface of the roller. The fan and the microholes form a suction structure to guide the spreading of raw materials output from the storage tank (8). Tensioning roller group (12) is provided between one side of the roller and the cross-laying machine, and between the heat treatment zone (4) and the cutting zone (5).

4. The meltblown PP sound-absorbing cotton production equipment according to claim 1, characterized in that: The heat treatment zone (4) includes vertically arranged and relatively rotating rollers. A heating rod is installed inside the rollers, and the surface of the upper roller is covered with an anti-adhesion layer to prevent fiber adhesion. The heat treatment zone (4) and the mixing zone (3) are provided with a post-treatment assembly (13). The post-treatment assembly (13) includes a chain conveyor, an embossing roller group or a covering roller group and a feeding roller. The embossing roller group or the covering roller group is fixed above the chain conveyor by a cylinder, and the feeding roller is located between the chain conveyor and the mixing zone (3).

5. The meltblown PP sound-absorbing cotton production equipment according to claim 1, characterized in that: The storage tank (8) includes inner and outer layers made of metal, and an independent cavity for installing an annular heating tube is provided between the inner and outer layers; a high-temperature resistant stirring component is rotatably connected inside the storage tank (8), and a temperature sensor is provided inside the tank; a flow guide tube (801) is provided at the bottom of the storage tank (8), and one end of the flow guide tube (801) is detachably connected to an installation base (802), and a spinneret (803) is detachably connected to the bottom of the installation base (802).

6. The meltblown PP sound-absorbing cotton production equipment according to claim 5, characterized in that: The mounting base (802) and the spinneret (803) are tightly fitted together. The mounting base (802) and the surface of the spinneret (803) are distributed with a plurality of corresponding and interconnected micropore structures for discharging fluid. The bottom ends of the spinneret (803) are fixedly connected with nozzles (804) corresponding to the positions of the micropore structures. The nozzles (804) are distributed downward at a 15-30° angle. The nozzles (804) are connected to one side of the air box (11) located on one side of the swing mechanism (10) through a pipe. The air box (11) is equipped with a heating rod inside. The other side of the air box (11) is connected to the Roots blower through a pipe.

7. The meltblown PP sound-absorbing cotton production equipment according to claim 1, characterized in that: The swing mechanism (10) includes an upper support base (1001) and a lower support base (1002). The upper support base (1001) is rotatably connected to a driving gear (1003) and a driven gear (1004) that mesh with each other. The upper support base (1001) is rotatably connected to a swing wheel (1005) that is coaxially arranged with the driven gear (1004). A pin (1007) is fixed on the surface of the swing wheel (1005). A rocker arm (1006) is provided at a distance from the surface of the swing wheel (1005). A first strip groove adapted to the pin (1007) is opened on the surface of the rocker arm (1006).

8. The meltblown PP sound-absorbing cotton production equipment according to claim 7, characterized in that: A sliding rod passes through the lower support base (1002). A guide block (1008) is fixed in the middle of the sliding rod, and springs are wound around the two ends of the guide block (1008) on the surface of the sliding rod. One end of the guide block (1008) is movably connected to the second strip groove near the bottom of the rocker arm (1006). The top of the rocker arm (1006) is rotatably connected to the upper support base (1001), and the rocker arm (1006) is provided with a connector between the first strip groove and the second strip groove, and is fixedly connected to the guide member (9) through the connector.

9. The meltblown PP sound-absorbing cotton production equipment according to claim 1, characterized in that: The guide member (9) has a trapezoidal structure that is wider at the top and narrower at the bottom. The guide member (9) has a wedge-shaped guide cavity inside, the cavity wall is inclined, and it forms a fiber filament guiding channel with the bottom through hole to guide the fiber filament to flow in a directional manner. The guide member (9) is sleeved on the outside of the spinneret assembly composed of the mounting base (802) and the spinneret plate (803).

10. A production equipment and method for meltblown PP sound-absorbing cotton, characterized in that, The method using the meltblown PP sound-absorbing cotton production equipment according to any one of claims 1 to 9 specifically includes the following steps: Step 1: After the filtered 3dtex-7dtex PP fibers are fluffed by the unpacking machine in the PP fiber feeding area (2), they are conveyed to the feed port of the four-roller opener by a belt conveyor. The fiber bundles processed by the four-roller opener are then conveyed to the feed end of the carding machine by a chain conveyor. After being carded into monofilaments by the cylinder in the carding machine, they are output by the stripping roller to the cross-laying machine. The upper and lower guide wires are cross-laid to form a three-dimensional fiber web, forming a PP fiber skeleton layer. At the same time, the filtered PP particles are sent into the heated screw conveyor (6) by the conveying pipe. The heated screw conveyor (6) is divided into three heating sections. The first heating section is set at 200℃, which is mainly used to soften the PP particles initially. The second heating section is raised to 230℃ to accelerate the melting process of the particles. The third heating section is stabilized at 250℃ to ensure that the melt is uniform and stable. The PP particles are heated and melted into a fluid in the heated screw conveyor (6). After being deeply filtered by the metal sintered filter element of the filter (7), they flow into the storage tank (8). Step 2: The stirring component in the storage tank (8) is combined with the annular heating tube and temperature sensor to maintain the fluid temperature at 250-280℃ to prevent solidification. The molten fluid flows into the mounting base (802) through the guide pipe (801) equipped with a flow meter and solenoid valve, and finally exits from the micropores of the spinneret (803) in a viscous state. Step 3: The nozzle (804) is supplied with air by a Roots blower and heated to 180-220°C by a heating rod inside the air box (11). The high-speed hot airflow generates shear force with the viscous fluid and stretches it into fiber filaments. The fiber filaments come into contact with the ambient air, and the temperature difference causes them to cool rapidly to below the melting point, crystallizing and solidifying. Step 4: The fiber filaments flow into the guide cavity of the guide (9). At this time, the driving gear (1003) drives the driven gear (1004) to rotate the swing wheel (1005). Through the sliding groove of the pin (1007) and the rocker arm (1006), the guide (9) swings back and forth above the roller in the mixing zone (3). Step 5: The tensioning roller group (12) pulls the PP fiber skeleton layer to the roller surface, while the reciprocating oscillating guide (9) lays the fiber filaments on it to achieve mixing. The mixture enters the heat treatment zone (4) through the mixing zone (3) and is heat-melted and solidified by heating the roller at 170-200℃. At the same time, the upper roller in the heat treatment zone (4) is provided with an anti-sticking layer. The thickness and flatness of the upper and lower rollers are controlled by adjusting the gap between the rollers. Step 6: When selecting the covering process, the homogeneous nonwoven fabric on the surface of the feeding roller is released by the drive motor, and then driven by the cylinder of the chain conveyor to descend and be heat-fused and bonded. When selecting the embossing process, the embossing roller group is driven by a cylinder to descend and press the material surface, so that the pattern is embedded in the material surface and cured. Step 7: After the fabric is covered / embossed, the raw material is pulled to the cutting section (5) by the tension roller group (12), and cut into sheets according to specifications by the CNC cutting machine. The cut sheets are collected and transported to the stamping equipment, formed by the stamping mold, and the waste can be recycled by hot melting and granulation at 200-230℃.

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