Melt-blown PP cotton and production process thereof

Abstract

The invention discloses melt-blown PP cotton and a production process thereof.The melt-blown PP cotton comprises a PP cotton body, the PP cotton body comprises a three-dimensional framework layer and an interpenetrating melt-blown layer which are integrally formed, PP serves as a single base material of the three-dimensional framework layer and the interpenetrating melt-blown layer, and the three-dimensional framework layer and the interpenetrating melt-blown layer form an integrated structure without an obvious interface through fiber interpenetrating and homogeneous melting; the three-dimensional skeleton layer is of a core supporting structure and comprises supporting ribs which are distributed in a crossed mode and filling fiber bundles which are arranged in gaps of the supporting ribs in a filling mode, and through the collaborative structural design of the three-dimensional skeleton layer, the penetrating melt-blowing layer and the continuous transition area, interface-free firm combination between layers is achieved; the multidirectional supporting ribs of the three-dimensional skeleton layer and the filling fiber bundles form a three-dimensional supporting system, the divergent embedded sections of the interpenetrating melt-blown layer penetrate through the skeleton layer to form interlocking, and the fibers of the transition area are interwoven and melted to eliminate interlayer stress, so that the problems that a traditional PET / PP mixed structure is easy to layer and poor in tear resistance are fundamentally solved through cooperation of the three layers; and meanwhile, the use of an adhesive is avoided, and the recycling rate of the decomposed waste is improved.

Description

Technical Field

[0001] This invention mainly relates to the field of meltblown PP cotton production technology, specifically to a meltblown PP cotton and its production process. Background Technology

[0002] Meltblown PP cotton is a type of ultra-fine fiber nonwoven fabric material produced by meltblowing polypropylene as raw material. The production process involves heating and melting the polypropylene raw material, then blowing it through a high-speed hot air stream, which stretches the molten fine stream to form extremely fine fibers. These fibers are then condensed into a fiber web on a receiving device and finally reinforced into a cotton-like material through self-adhesion or thermal bonding.

[0003] Traditional meltblown PP cotton processing technology typically uses a PET and PP composite structure. Due to poor material compatibility, complex separation processes are required during recycling, resulting in high waste disposal costs and low recycling rates, making it difficult to achieve resource recycling. Furthermore, due to the difference in thermal expansion coefficients of the mixed materials, stress concentration is easily generated at the interface, leading to poor tear resistance and easy delamination or breakage during long-term use. At the same time, the mixing process requires high temperature (≥280℃) to address the bonding issues of different materials and relies on adhesives, resulting in increased energy consumption costs. Summary of the Invention

[0004] The present invention addresses the problem that existing technical solutions are too simplistic by providing a meltblown PP cotton and its production process. This solution solves the technical problem mentioned in the background that due to the differences in physicochemical properties between PET and PP materials, complex separation processes, such as solvent dissolution, are required for material separation during recycling, resulting in a cumbersome and inefficient process.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A meltblown PP cotton includes a PP cotton body, which comprises an integrally formed three-dimensional skeleton layer and an interwoven meltblown layer. Both layers use PP as a single substrate and form an integrated structure without obvious interfaces through fiber interweaving and homogeneous melting.

[0006] The three-dimensional skeleton layer is the core support structure, including intersecting support ribs and filling fiber bundles filling the gaps between the support ribs. The support ribs and filling fiber bundles are intertwined to form a three-dimensional mesh-like porous structure.

[0007] The interpenetrating meltblown layer is composed of PP ultrafine fibers, which form embedded segments and surface segments. The embedded segments penetrate deep into the three-dimensional pores of the three-dimensional skeleton layer, forming a dense fiber mesh structure on the surface of the three-dimensional skeleton layer together with the supporting ribs and filling fiber bundles.

[0008] Furthermore, the support ribs of the three-dimensional skeleton layer are distributed in multiple directions, including longitudinal, transverse and diagonal, and the intersection points are fixed by homogeneous melting to form an interconnected three-dimensional support system; the filling fiber bundles are uniformly filled in the grid gaps formed by the support ribs and tightly wrapped with the support ribs.

[0009] Furthermore, the embedded segments of the interpenetrating meltblown layer are distributed in a divergent manner, with some fibers penetrating the pores of the three-dimensional skeleton layer and extending to the other side to form a through-type interlocking structure; the dense fiber mesh of the surface segment forms a continuous functional surface layer.

[0010] Furthermore, a continuous fusion transition zone is formed at the interface between the three-dimensional skeleton layer and the interpenetrating meltblown layer, and the fibers of the three-dimensional skeleton layer and the interpenetrating meltblown layer intertwine and melt together in the transition zone to eliminate interlayer stress concentration.

[0011] Furthermore, the thickness of the PP cotton body is 1-8mm, wherein the thickness of the three-dimensional skeleton layer accounts for 60%-80%, and the thickness of the interlaced meltblown layer accounts for 20%-40%.

[0012] A production process for meltblown PP cotton, the method specifically includes the following steps: S1-1 and PP coarse fibers are sequentially opened by an opening machine and removed by an air classifier to remove heavy impurities and metal impurities. S1-2. After the conventional PP fibers are opened and impurities are removed by the opening machine, they are sent together with the coarse PP fibers into the heat setting equipment and treated at 110-130℃ for 20-40 minutes to enhance the structural stability of the fibers. S1-3 PP particles are filtered through a vibrating screen to remove particulate impurities and ensure the purity of the raw materials; S1-4. The raw material processing of Line 1 and Line 2 is carried out simultaneously to ensure that the feeding rhythm of subsequent compounding processes is matched. S2-1. The heat-set PP coarse fibers are fed into a multi-directional weaving device, and weaving is carried out along the longitudinal, transverse and oblique directions, with a cross weaving angle of 30°-60° to form a support rib network. During the weaving process, the cross points are initially heat-melted and fixed at 150-170°. S2-2. The PP conventional fiber bundles are evenly filled into the grid gaps of the support rib network through the air conveying mechanism, and then combed by the combing roller to make the filling fiber bundles tightly wrapped with the support ribs. S2-3. The filled fiber network is fed into a hot melt equipment and cured at a constant temperature of 160-180℃ for 10-20 minutes to form a structurally stable three-dimensional skeleton layer. S2-4, the three-dimensional skeleton layer is conveyed to the composite station at a constant speed through the guide roller group and tension control system, which is adapted to the blowing speed of the line's two-polar fine fiber; S3-1. Feed the filtered PP particles into the meltblown equipment hopper and heat them to 200-230℃ to melt them. S3-2. The molten PP raw material is blown through a multi-angle meltblown die head. The blowing angle of the die head is 15°-45° with the surface of the three-dimensional skeleton layer. The blowing pressure is controlled at 0.3-0.6MPa to form extremely fine fiber filaments. S3-3, the ambient temperature of the composite work station is controlled at 160-180℃. Under the action of blowing force, some of the ultra-fine fibers penetrate the three-dimensional pores of the three-dimensional skeleton layer to form embedded segments, which are wrapped with the support ribs and filling fiber bundles. Some of them are condensed on the surface to form surface segments, and interlocking is achieved through homogeneous melting.

[0013] S4-1. Constant temperature curing is carried out at 170-190℃ for 5-15 minutes to ensure that the fibers in the transition zone are fully melted and interwoven to eliminate the interlayer interface. S4-2. If the PP nonwoven fabric is to be covered during the process, the PP nonwoven fabric should be precisely bonded to the surface of the composite substrate and sent into the thermal bonding equipment for hot pressing at 150-170℃ and 0.15-0.3MPa for 5-10 minutes. S4-3. If embossing is to be performed, the embossing is to be performed by rolling and printing rollers with preset patterns at 140-160℃ and 0.1-0.2MPa, and then air-dried at 40-60℃ for shaping.

[0014] In step S5, after stamping and cutting, the collected waste material is directly sent to the hot melt granulator for recycling.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves a strong, interface-free bond between layers through a synergistic structural design of a three-dimensional skeleton layer, an interpenetrating meltblown layer, and a continuous transition zone. The multi-directional support ribs of the three-dimensional skeleton layer and the filling fiber bundles form a three-dimensional support system. The divergent embedded segments of the interpenetrating meltblown layer penetrate the skeleton layer to form an interlock. The interwoven and melted fibers in the transition zone eliminate interlayer stress. The synergistic effect of these three elements fundamentally solves the problems of easy delamination and poor tear resistance in traditional PET / PP hybrid structures. This improves the overall deformation resistance and interlayer bonding strength of the material compared to existing technologies, while avoiding the use of adhesives and ensuring material purity.

[0016] 2. Based on a stable structure, this invention achieves synergy between support performance and functional characteristics. The three-dimensional skeleton layer provides channels through its three-dimensional mesh pores, while the dense fiber mesh interspersed with the meltblown layer constructs the functional surface layer. The two form a hierarchical structure of three-dimensional pores and dense surface layer, which improves the sound absorption coefficient and filtration efficiency of the material compared to traditional pure PP meltblown cotton. Moreover, its layer thickness is suitable for functional requirements in multiple scenarios.

[0017] 3. At the same time, relying on the homogeneous melting characteristics of a single PP substrate, not only does the production process not require high-temperature treatment and reduce energy consumption compared to traditional mixing processes, but it also achieves efficient recycling of waste materials. Cut waste materials can be directly hot-melted and granulated for reuse, with a recycling rate of ≥95%, without the need for complex separation processes. Meanwhile, the aforementioned synergistic structural design ensures the performance stability of the recycled materials, forming a virtuous cycle from structure and energy saving to environmental protection, which not only reduces production and waste disposal costs, but also conforms to the concept of green production.

[0018] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional skeleton layer structure of the present invention; Figure 3 This is a schematic diagram of the interlaced meltblown layer structure of the present invention; Figure 4 This is a schematic diagram of a partial cross-sectional structure of the PP cotton main body of the present invention; Figure 5 This is a flowchart of the production process of the present invention.

[0020] Numbering on the map: 1. PP cotton body; 11. Three-dimensional skeleton layer; 111. Supporting ribs; 112. Filling fiber bundles; 12. Interlaced meltblown layer; 121. Embedded section; 122. Surface section. Detailed Implementation

[0021] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Please refer to the appendix carefully. Figure 1-5 A meltblown PP cotton includes a PP cotton body 1, which includes an integrally formed three-dimensional skeleton layer 11 and an interwoven meltblown layer 12. Both of them use PP as a single substrate and form an integrated structure without obvious interfaces through fiber interweaving and homogeneous melting.

[0024] The three-dimensional skeleton layer 11 is the core support structure, including mutually intersecting support ribs 111 and filling fiber bundles 112 filling the gaps between the support ribs 111. The support ribs 111 and the filling fiber bundles 112 are intertwined to form a three-dimensional mesh porous structure.

[0025] The interpenetrating meltblown layer 12 is composed of PP ultrafine fibers, which form embedded segments 121 and surface segments 122. The embedded segments 121 penetrate into the three-dimensional pores of the three-dimensional skeleton layer 11, forming a dense fiber mesh structure on the surface of the three-dimensional skeleton layer 11 together with the support ribs 111 and the filling fiber bundles 112.

[0026] In this embodiment, as Figure 2 and Figure 4 As shown, the support ribs 111 of the three-dimensional skeleton layer 11 are distributed in multiple directions, including longitudinal, transverse and oblique directions. The intersection points are fixed by homogeneous melting to form an interconnected three-dimensional support system. The filling fiber bundles 112 are uniformly filled in the grid gaps formed by the support ribs 111 and tightly wrapped with the support ribs 111.

[0027] Through the above structure, the support ribs 111 are distributed in multiple directions and fixed by homogeneous melting to form a three-dimensional support system with no dead angles, which improves the overall tear resistance and deformation resistance of the material. The filling fiber bundles 112 uniformly fill the gaps in the grid and tightly wrap with the support ribs 111, which not only fills the gaps between the support ribs 111 and makes the structural density more uniform, but also further strengthens the integrity of the support system. Moreover, it does not rely on adhesives, but relies on the homogeneous melting characteristics of PP material to achieve a firm bond, taking into account both structural stability and environmental recyclability.

[0028] In this embodiment, as Figure 3 and Figure 4 As shown, the embedded segments 121 of the interpenetrating meltblown layer 12 are distributed in a divergent manner, and some fibers penetrate the pores of the three-dimensional skeleton layer 11 and extend to the other side to form a through-type interlocking structure; the dense fiber mesh of the surface segment 122 forms a continuous functional surface layer.

[0029] Through the above structure, the embedded segment 121 is distributed in a divergent manner and some fibers penetrate through the three-dimensional skeleton layer 11 to form a through-interlocking structure, which locks the two layers tightly like an anchor, improves the interlayer bonding strength, and prevents separation and detachment; the dense fiber mesh of the surface segment 122 constructs a continuous functional surface layer, effectively endowing the material with core performance characteristics such as sound absorption and filtration.

[0030] In this embodiment, as Figure 4 As shown, a continuous fusion transition zone is formed at the interface between the three-dimensional skeleton layer 11 and the interpenetrating meltblown layer 12, and the fibers of the three-dimensional skeleton layer 11 and the interpenetrating meltblown layer 12 intertwine and melt together in the transition zone to eliminate interlayer stress concentration.

[0031] Through the above structure, the two layers of fibers intertwine and melt in the transition zone, breaking the interlayer boundary of the traditional composite structure. This not only improves the interlayer bonding strength but also effectively eliminates interlayer stress concentration, fundamentally avoiding the problems of delamination and breakage when the material is used for a long time or under stress. At the same time, relying on the homogeneous melting characteristics, it ensures the consistency and stability of the overall structure, allowing the supporting performance and functional characteristics to form a synergistic gain.

[0032] In this embodiment, as Figure 1 and Figure 4 As shown, the thickness of the PP cotton body 1 is 1-8mm, of which the thickness of the three-dimensional skeleton layer 11 accounts for 60%-80%, and the thickness of the interlaced meltblown layer 12 accounts for 20%-40%.

[0033] Through the above structure, the three-dimensional skeleton layer 11, with a thickness ratio of 60%-80%, constructs a stable three-dimensional support system, providing the material with sufficient tear resistance and structural stability. The proportion of the interspersed meltblown layer 12 not only ensures the functional effectiveness of the dense fiber mesh on the surface, but also allows it to fully interweave and melt with the skeleton layer through a reasonable thickness, avoiding stress concentration between layers.

[0034] A production process for meltblown PP cotton specifically includes the following steps: S1. Select PP coarse fiber, PP conventional fiber and PP particles, and perform impurity removal, shaping or filtration treatment respectively.

[0035] S1-1 and PP coarse fibers are sequentially opened by an opening machine and removed by an air classifier to remove heavy impurities and metal impurities.

[0036] S1-2. After the conventional PP fibers are opened and impurities are removed by the opening machine, they are sent together with the coarse PP fibers into the heat setting equipment and treated at 110-130℃ for 20-40 minutes to enhance the structural stability of the fibers.

[0037] S1-3 PP particles are filtered through a vibrating screen to remove particulate impurities and ensure the purity of the raw materials.

[0038] S1-4. The raw material processing of Line 1 and Line 2 is carried out simultaneously to ensure that the feeding rhythm of subsequent compounding processes is matched.

[0039] S2. In line one, PP coarse fibers are woven to form a support rib network 111, and PP conventional fibers are used as filler fiber bundles 112 to wrap around the support ribs 111, and then heat-melted and cured to form a three-dimensional skeleton layer 11.

[0040] S2-1. The heat-set PP coarse fibers are fed into a multi-directional weaving device, and weaving is carried out along the longitudinal, transverse and oblique directions, with a cross weaving angle of 30°-60° to form a support rib 111 network. During the weaving process, the cross points are initially heat-melted and fixed at 150-170°.

[0041] S2-2. The conventional PP fiber bundles are uniformly filled into the grid gaps of the support rib 111 network by the airflow conveying mechanism, and then combed by the combing roller to make the filling fiber bundles 112 tightly wrapped with the support ribs 111.

[0042] S2-3. The filled fiber network is fed into a hot melt equipment and cured at a constant temperature of 160-180℃ for 10-20 minutes to form a structurally stable three-dimensional skeleton layer 11.

[0043] S2-4 and the three-dimensional skeleton layer 11 are conveyed to the composite station at a constant speed through the guide roller group and tension control system, and are adapted to the blowing speed of the line's two-electrode fine fiber.

[0044] S3. In line two, PP particles are melted and blown to form ultra-fine fibers. Some fibers are embedded in the three-dimensional skeleton layer 11 to form embedded segments 121, and some are formed on the surface to form surface segments 122. Interlocking bonding is achieved through homogeneous melting to obtain a composite substrate.

[0045] S3-1. Feed the filtered PP particles into the hopper of the meltblown equipment and heat them to 200-230℃ to melt them.

[0046] S3-2. The molten PP raw material is blown through a multi-angle meltblown die head. The blowing angle of the die head is 15°-45° with the surface of the three-dimensional skeleton layer 11. The blowing pressure is controlled at 0.3-0.6MPa to form extremely fine fiber filaments.

[0047] S3-3, the ambient temperature of the composite work station is controlled at 160-180℃. Under the action of the blowing force, the ultra-fine fibers partially penetrate the three-dimensional skeleton layer 11 to form the embedded segment 121, which is wrapped with the support rib 111 and the filling fiber bundle 112. Some of them are condensed on the surface to form the surface segment 122, and interlocking is achieved through homogeneous melting.

[0048] S4. Post-processing: The composite substrate is cured at a constant temperature, and the calibrated composite substrate is selectively coated and embossed.

[0049] S4-1. Constant temperature curing is carried out at 170-190℃ for 5-15 minutes to ensure that the fibers in the transition zone are fully melted and interwoven, eliminating the interlayer interface.

[0050] S4-2. If the PP nonwoven fabric is to be covered during the process, the PP nonwoven fabric should be precisely bonded to the surface of the composite substrate and sent into the thermal lamination equipment for hot pressing at 150-170℃ and 0.15-0.3MPa for 5-10 minutes.

[0051] S4-3. During the embossing process, the embossing is performed by rolling and printing rollers with preset patterns at 140-160℃ and 0.1-0.2MPa, followed by air drying at 40-60℃.

[0052] In step S5, after stamping and cutting, the collected waste material is directly sent to the hot melt granulator for recycling.

[0053] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A meltblown PP cotton, characterized in that: The PP cotton body (1) includes an integrally formed three-dimensional skeleton layer (11) and an interpenetrating meltblown layer (12). Both of them use PP as a single substrate and form an integrated structure without obvious interface through fiber interpenetration and homogeneous melting. The three-dimensional skeleton layer (11) is the core support structure, including mutually intersecting support ribs (111) and filling fiber bundles (112) filling the gaps between the support ribs (111). The support ribs (111) and filling fiber bundles (112) are intertwined to form a three-dimensional mesh pore structure. The interpenetrating meltblown layer (12) is made of PP ultrafine fibers, which form embedded segments (121) and surface segments (122). The embedded segments (121) penetrate into the three-dimensional pores of the three-dimensional skeleton layer (11) and form a dense fiber mesh structure on the surface of the three-dimensional skeleton layer (11) together with the support ribs (111) and the filling fiber bundles (112).

2. The meltblown PP cotton according to claim 1, characterized in that: The support ribs (111) of the three-dimensional skeleton layer (11) are distributed in multiple directions, including longitudinal, transverse and oblique directions. The intersection points are fixed by homogeneous melting to form an interconnected three-dimensional support system. The filling fiber bundles (112) are uniformly filled in the grid gaps formed by the support ribs (111) and tightly wrapped with the support ribs (111).

3. The meltblown fabric according to claim 1, characterized in that: The embedded segments (121) of the interpenetrating meltblown layer (12) are distributed in a divergent manner, and some fibers penetrate the pores of the three-dimensional skeleton layer (11) and extend to the other side to form a through-type interlocking structure; the dense fiber mesh of the surface segment (122) forms a continuous functional surface layer.

4. The meltblown PP cotton according to claim 1, characterized in that: A continuous fusion transition zone is formed at the interface between the three-dimensional skeleton layer (11) and the interpenetrating meltblown layer (12), and the fibers of the three-dimensional skeleton layer (11) and the interpenetrating meltblown layer (12) intertwine and melt together in the transition zone to eliminate interlayer stress concentration.

5. The meltblown PP cotton according to claim 1, characterized in that: The thickness of the PP cotton body (1) is 1-8mm, of which the thickness of the three-dimensional skeleton layer (11) accounts for 60%-80% and the thickness of the interlaced meltblown layer (12) accounts for 20%-40%.

6. A production process for meltblown PP cotton as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Select PP coarse fiber, PP conventional fiber and PP particles, and perform impurity removal, shaping or filtration treatment respectively; S2. In line one, PP coarse fiber is woven to form a support rib (111) network, and PP conventional fiber is used as a filler fiber bundle (112) to wrap with the support rib (111), and then heat-melted to form a three-dimensional skeleton layer (11). S3. In line 2, PP particles are melted and blown to form ultra-fine fibers. Some fibers are embedded in the three-dimensional skeleton layer (11) to form embedded segments (121), and some are formed on the surface to form surface segments (122). Interlocking is achieved through homogeneous melting to obtain a composite substrate. S4. Post-processing: The composite substrate is cured at a constant temperature, and the calibrated composite substrate is selectively coated and embossed. S5. After post-processing, the material is rolled up and temporarily stored. Then, it is stamped and cut according to the finished product requirements, and the cutting waste is recycled.

7. The production process of meltblown PP cotton according to claim 6, characterized in that, The specific operations of step S1 also include: S1-1 and PP coarse fibers are sequentially opened by an opening machine and removed by an air classifier to remove heavy impurities and metal impurities. S1-2. After the conventional PP fibers are opened and impurities are removed by the opening machine, they are sent together with the coarse PP fibers into the heat setting equipment and treated at 110-130℃ for 20-40 minutes to enhance the structural stability of the fibers. S1-3 PP particles are filtered through a vibrating screen to remove particulate impurities and ensure the purity of the raw materials; S1-4. The raw material processing of Line 1 and Line 2 is carried out simultaneously to ensure that the feeding rhythm of subsequent compounding processes is matched.

8. The production process of meltblown PP cotton according to claim 6, characterized in that, The specific operations of step S2 also include: S2-1. The heat-set PP coarse fiber is fed into a multi-directional weaving device, along the longitudinal, transverse and oblique directions, and a cross weaving angle of 30°-60° is set to form a support rib (111) network. During the weaving process, the cross points are initially heat-melted and fixed at 150-170°. S2-2. The PP conventional fiber bundles are uniformly filled into the grid gaps of the support rib (111) network by the airflow conveying mechanism, and then combed by the combing roller to make the filling fiber bundles (112) tightly wrapped with the support ribs (111); S2-3. The filled fiber network is sent into a hot melt equipment and cured at 160-180℃ for 10-20 minutes to form a three-dimensional skeleton layer with a stable structure (11). S2-4, the three-dimensional skeleton layer (11) is conveyed to the composite station at a constant speed through the guide roller group and tension control system, and is adapted to the blowing speed of the line's two-electrode fine fiber.

9. The production process of meltblown PP cotton according to claim 6, characterized in that, The specific operations of step S3 also include: S3-1. Feed the filtered PP particles into the meltblown equipment hopper and heat them to 200-230℃ to melt them. S3-2. The molten PP raw material is sprayed through a multi-angle meltblown die head. The spraying angle of the die head is 15°-45° with the surface of the three-dimensional skeleton layer (11). The spraying pressure is controlled at 0.3-0.6MPa to form extremely fine fiber filaments. S3-3, the ambient temperature of the composite work station is controlled at 160-180℃. Under the action of the blowing force, the ultra-fine fibers partially penetrate the three-dimensional skeleton layer (11) to form an embedded segment (121), which is wrapped with the support rib (111) and the filling fiber bundle (112). Part of it is condensed on the surface to form a surface segment (122), and interlocking is achieved through homogeneous melting.

10. The production process of meltblown PP cotton according to claim 6, characterized in that, The specific operations of step S4 include: S4-1. Constant temperature curing is carried out at 170-190℃ for 5-15 minutes to ensure that the fibers in the transition zone are fully melted and interwoven to eliminate the interlayer interface. S4-2. During the fabric covering process, the PP non-woven fabric is precisely bonded to the surface of the composite substrate and sent into the thermal lamination equipment for hot pressing at 150-170℃ and 0.15-0.3MPa for 5-10 minutes. S4-3. During the embossing process, the embossing is performed by rolling and printing rollers with preset patterns at 140-160℃ and 0.1-0.2MPa, followed by air drying and shaping at 40-60℃. And / or, in step S5, after stamping and cutting, the collected waste material is directly sent to the hot melt granulator for recycling.

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