Non-woven composite structure

Abstract

The utility model discloses a non-woven composite structure, which relates to the technical field of composite materials and comprises a reinforcing layer and at least two non-woven fiber web layers, and the reinforcing layer and all the non-woven fiber web layers are connected into a whole by adopting a heat bonding process. According to the non-woven composite structure, the strength of a non-woven composite material can be enhanced, and the safety of a product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite materials, in particular to a non-woven composite structure. Background Art

[0002] Non-woven materials are flexible materials formed by processing polymer compounds, fibrous aggregates, etc. through physical or chemical methods without spinning and weaving, such as can be prepared by the method of multi-fiber mixed spraying and web forming. Non-woven composite materials generally have a good hand feeling, and have good properties such as softness and hygroscopicity, but non-woven composite materials generally have the disadvantage of low strength, and are currently mostly used in products such as wet wipes and dry wipes, and it is difficult to meet the application requirements of products such as clothing linings, bath towels, and bathrobes.

[0003] At present, the methods for improving the strength of non-woven composite materials mostly involve increasing the number of layers of the product, such as setting multiple non-woven fiber web layers and using more adhesives to bond the layers. Especially the method of using adhesives can achieve immediate results in increasing strength. For example, the degradable non-woven material provided by Chinese Patent CN202211497087.9 discloses that the degradable non-woven material is a spunlace non-woven fabric, a meltblown non-woven fabric, and a spunbond non-woven fabric adhesively bonded in sequence by an adhesive. However, most adhesives contain aldehyde molecules and cannot well meet the requirements in terms of safety. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a non-woven composite structure to solve the problems existing in the above-mentioned prior art, which can enhance the strength of the non-woven composite structure and improve the safety of the product.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model provides a non-woven composite structure, which includes a reinforcing layer and at least two non-woven fiber web layers, and the reinforcing layer and all the non-woven fiber web layers are connected into one body by a thermal bonding process.

[0007] Preferably, the reinforcing layer is a mesh cloth layer.

[0008] Preferably, the reinforcing layer is a mesh non-woven fabric layer.

[0009] Preferably, it further includes at least one water-absorbing layer, and the reinforcing layer, all the non-woven fiber web layers and all the water-absorbing layers are connected into one body by a thermal bonding process.

[0010] Preferably, both the non-woven fiber web layer and the water-absorbing layer are two layers, both sides of the reinforcing layer are connected to one water-absorbing layer, and one side of each water-absorbing layer away from the reinforcing layer is connected to one non-woven fiber web layer.

[0011] Preferably, the non-woven fiber web layer is made by a spunbond process or a meltblown process.

[0012] Preferably, the non-woven fiber web layer is a thermoplastic material layer.

[0013] Preferably, the mesh cloth layer is formed by interweaving filaments, and the filaments are made of a thermoplastic material.

[0014] Preferably, the length and width of the mesh holes in the mesh cloth layer are both 1 mm to 20 mm, and the thickness of the mesh cloth layer is 0.01 mm to 2 mm.

[0015] Preferably, the fineness of the filaments is 10 D to 1500 D.

[0016] The present utility model has achieved the following technical effects compared with the prior art:

[0017] The present utility model provides a non-woven composite structure, including a reinforcing layer and at least two non-woven fiber web layers. The reinforcing layer and all non-woven fiber web layers are connected into one body by a thermal bonding process. The non-woven composite structure provided by the present utility model is provided with a reinforcing layer, which can enhance the strength of the non-woven composite structure, and the structures of each layer are connected by a thermal bonding process, avoiding the use of adhesives, and can greatly improve the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of the non-woven composite structure provided in Embodiment 3;

[0020] Figure 2 It is a preparation flow chart of the non-woven composite structure provided in Embodiment 3;

[0021] Figure 3 It is a schematic structural diagram of the non-woven composite structure provided in Embodiment 4;

[0022] Figure 4 It is a preparation flow chart of the non-woven composite structure provided in Embodiment 4;

[0023] Figure 5 Schematic structural diagrams of the non-woven composite structures provided in Embodiments 5 and 7;

[0024] Figure 6 Flow chart for preparing the nonwoven composite structure provided in Example 5;

[0025] Figure 7 Schematic structural diagram of the nonwoven composite structure provided in Example 6;

[0026] Figure 8 Flow chart for preparing the nonwoven composite structure provided in Example 6;

[0027] Figure 9 Flow chart for preparing the nonwoven composite structure provided in Example 7;

[0028] Figure 10 Schematic diagram of a circular spinneret hole;

[0029] Figure 11 Schematic diagram of a double - circular spinneret hole;

[0030] Figure 12 Schematic diagram of a trilobal spinneret hole;

[0031] Figure 13 Schematic diagram of a five - lobed spinneret hole;

[0032] Figure 14 Schematic diagram of a cross - shaped spinneret hole;

[0033] Figure 15 Schematic front - side structural diagram of the mesh cloth in the present utility model;

[0034] In the figure: 100, nonwoven composite structure; 1, first nonwoven fiber web; 2, reinforcing layer; 3, second nonwoven fiber web; 4, first thermoplastic raw material; 5, second thermoplastic raw material; 6, first water - absorbing layer; 7, second water - absorbing layer; 8, cellulose fiber one; 9, first polymer supply system; 10, spinneret plate; 11, annular hot air release port; 12, spinneret hole; 13, fourth polymer supply system; 14, forming screen; 15, hot rolling machine; 16, second polymer supply system; 17, third polymer supply system; 18, first air - laid feeding device; 19, second air - laid feeding device; 20, fifth polymer supply system; 21, sixth polymer supply system; 22, cellulose fiber two; 23, circular spinneret hole; 24, double - circular spinneret hole; 25, trilobal spinneret hole; 26, five - lobed spinneret hole; 27, cross - shaped spinneret hole. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] The purpose of the present invention is to provide a non-woven composite structure to solve the problems existing in the above-mentioned prior art, which can enhance the strength of the non-woven composite structure and improve the safety of the product.

[0037] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] Embodiment 1

[0039] As Figures 1-15 shown, the present invention provides a non-woven composite structure 100, which includes a reinforcing layer 2 and at least two non-woven fiber web layers. The reinforcing layer 2 and all non-woven fiber web layers are connected into one body by a thermal bonding process. The non-woven composite structure 100 provided by the present invention is provided with a reinforcing layer 2, which can enhance the strength of the non-woven composite structure 100, and the structures of each layer are connected by a thermal bonding process, avoiding the use of adhesives, and can greatly improve the safety of the product.

[0040] In this embodiment, the reinforcing layer 2 is a mesh cloth layer.

[0041] In this embodiment, the reinforcing layer 2 is a mesh non-woven fabric layer.

[0042] In this embodiment, the non-woven fiber web layer is made by a spunbond process or a meltblown process.

[0043] In this embodiment, the non-woven fiber web layer is a thermoplastic material layer, which is convenient for spunbonding or meltblowing forming. As a preferred embodiment, the raw material of the non-woven fiber web layer can be one or several of thermoplastic raw materials such as polypropylene, polyethylene terephthalate, and polylactic acid. For example, it can be composed of a first thermoplastic raw material 4 and a second thermoplastic raw material 5.

[0044] In this embodiment, the mesh cloth layer is woven by filaments, and the filaments are made of thermoplastic materials. As a preferred embodiment, the filaments can be one or several of thermoplastic raw materials such as polyester fiber, nylon, polyethylene, and polypropylene. As another preferred embodiment, the mesh cloth layer is composed of spunbond non-woven fabric.

[0045] In this embodiment, the mesh cloth layer is composed of spunbond nonwoven fabric, and the gram weight range of the spunbond nonwoven fabric is 10 gsm - 55 gsm.

[0046] In this embodiment, the length and width of the mesh holes in the mesh cloth layer are both 1 mm to 20 mm, that is, the longitudinal and transverse spacings of the filaments in the mesh cloth layer are both 1 mm to 20 mm, and the thickness of the mesh cloth layer is 0.01 mm to 2 mm. The size of the mesh holes in the mesh cloth layer can be adjusted according to the required product strength, enriching the available scenarios of the material.

[0047] In this embodiment, the fineness of the filaments is 10 D to 1500 D. The fineness of the filaments can be adjusted according to the required product strength, enriching the available scenarios of the material.

[0048] Embodiment 2

[0049] This embodiment provides a nonwoven composite structure 100, which further includes at least one water-absorbing layer, and the reinforcing layer 2, all nonwoven fiber layers and all water-absorbing layers are connected into one body by a thermal bonding process.

[0050] The water-absorbing layer is formed by co-spraying cellulose fibers and a nonwoven fiber web. The specific method is as follows: Put the two raw materials of cellulose fibers and nonwoven fiber web into an air-laying device and a meltblowing device respectively, so that when the nonwoven fiber web layer in the water-absorbing layer is ejected, it forms an angle of 30 - 90° with the falling direction of wood pulp fibers or other cellulose fibers, so that the cellulose fibers and the nonwoven fiber web adhere to each other to form a water-absorbing layer. The raw materials used for the nonwoven fiber web layer and the nonwoven fiber web layer are the same. The cellulose fibers are one or more of cellulose fibers such as wood pulp fibers, short cotton fibers, short hemp fibers, and bamboo fibers.

[0051] The other structures of the nonwoven composite structure 100 in this embodiment are the same as those in Embodiment 1.

[0052] The preparation method of the nonwoven composite structure 100 provided in this embodiment is as follows:

[0053] S1: Feed one or several of the thermoplastic raw materials into the first polymer supply system 9. After the thermoplastic raw materials are melted at high temperature in the polymer supply system, they are ejected from the spinneret 10, and after cooling and drawing or drawing and cooling, they fall onto the forming curtain 14 to form the first nonwoven fiber web layer 1.

[0054] S2: After the cellulose fibers are placed in the first air-laying feeding device 18 and dispersed, they are evenly distributed in the transverse direction and air-laid by the first air-laying equipment; the non-woven fiber web is placed in the second polymer supply system 16 and obliquely ejected through the corresponding spinneret holes 12, so that the fibers ejected from the spinneret holes 12 are adhesively mixed with the falling cellulose fibers and finally fall on the forming screen 14 (fall on the first non-woven fiber web 1), forming the first water-absorbing layer 6;

[0055] S3: Place the reinforcing layer 2 (mesh cloth or spunbond cloth) on the first water-absorbing layer 6 by means of a pay-off reel.

[0056] S4: After the cellulose fibers are placed in the second air-laying feeding device 19 and dispersed, they are evenly distributed in the transverse direction and air-laid by the second air-laying equipment; the non-woven fiber web is placed in the third polymer supply system 17 and obliquely ejected through the corresponding spinneret holes 12, so that the fibers ejected from the spinneret holes 12 are adhesively mixed with the falling cellulose fibers and finally fall on the forming screen 14 (fall on the reinforcing layer 2), forming the second water-absorbing layer 7;

[0057] S5: Feed one or several of the thermoplastic raw materials into the fourth polymer supply system 13. After the thermoplastic raw materials are melted at a high temperature in the polymer supply system, they are ejected from the spinneret plate 10. After being first drawn and then cooled or first cooled and then drawn, they fall on the forming screen 14 (fall on the second water-absorbing layer 7), forming the second non-woven fiber web layer 3. It should be noted that the spinneret plate 10 further includes an annular hot air release port 11, which is concentrically arranged with the spinneret holes 12. The spinneret holes 12 are used to release the melt, and the annular hot air release port 11 is used to release the air flow to draw the melt. Cooling can be carried out by blowing cold air or other methods.

[0058] S6: The multi-layer composite non-woven material (the first non-woven fiber web layer 1, the first water-absorbing layer 6, the reinforcing layer 2, the second water-absorbing layer 7, the second non-woven fiber web layer 3) is compounded by hot bonding of the hot rolling machine 15.

[0059] Preferably, the melting temperature of the thermoplastic raw materials in the polymer supply system is 160 °C to 280 °C.

[0060] Preferably, cooling and drawing or drawing and cooling are carried out by means of cooling air, and the cooling temperature of the cooling air is 2 °C to 30 °C.

[0061] Preferably, the hot air flow rate for melting the raw materials by the meltblowing equipment is 2000 - 6000m 3 / h.

[0062] Preferably, the spinneret plate 10 of the meltblowing equipment can adopt the traditional "slot air knife" drawing form or the "coaxial meltblowing" form.

[0063] Preferably, the spinneret holes 12 of the spinneret 10 for "coaxial meltblowing" can be single-row holes or multi-row holes.

[0064] Preferably, the shape of the spinneret holes 12 can be circular spinneret holes 23 or special-shaped spinneret hole forms. The special-shaped spinneret holes can be in the forms of double-circular spinneret holes 24, three-leaf-shaped spinneret holes 25, five-leaf-shaped spinneret holes 26, cross-shaped spinneret holes 27, etc.

[0065] Preferably, the hot rolling pressure is 25 - 100 bar.

[0066] Preferably, the hot rolling temperature is 70 - 200 °C.

[0067] Preferably, the hot rolling speed is 10 - 600 m / min.

[0068] It should be noted that the polymer supply system in this embodiment includes meltblowing equipment or spunbonding equipment. The polymer supply system, air-laid feeding device, meltblowing equipment, air-laid equipment, hot rolling machine 15, forming curtain 14, etc. adopted in this embodiment can all be equipment in the prior art, and will not be elaborated here.

[0069] Example 3

[0070] Reference Figure 1 , this embodiment provides a non-woven composite structure 100, which includes a first non-woven fiber web layer 1, a reinforcing layer 2, and a second non-woven fiber web layer 3 arranged in sequence. The first non-woven fiber web layer 1 and the second non-woven fiber web layer 3 are polyethylene terephthalate spunbond non-woven fiber webs, and the reinforcing layer 2 is a mesh fabric. The mesh fabric is woven from nylon filaments and polyethylene filaments. The fineness of the nylon filaments and polyethylene filaments is 150 D. The longitudinal distance and the transverse distance of the filaments in the mesh fabric are both 15 mm, and the thickness of the mesh fabric is 0.05 mm.

[0071] The other structures of the non-woven composite structure 100 in this embodiment are the same as those in Example 1.

[0072] Reference Figure 2 , the preparation method of the non-woven composite structure 100 provided in this embodiment is as follows:

[0073] S1: Feed polyethylene terephthalate into the first polymer supply system 9. After the polyethylene terephthalate is melted at a high temperature of 275 °C in the polymer supply system, it is ejected from the spinneret 10, cooled by cooling air at 15 °C, and then drawn and dropped onto the forming curtain 14 to form the first non-woven fiber web 1.

[0074] S2: Lay the mesh fabric flat on the first non-woven fiber web 1 through a pay-off reel.

[0075] S3: Feed polyethylene terephthalate into the fourth polymer supply system 13. After being melted at a high temperature of 275°C in the polymer supply system, the polyethylene terephthalate is ejected from the spinneret 10, cooled by the cooling air at 15°C, and then drawn and dropped onto the forming screen 14 to form the second non-woven fiber web 3.

[0076] S4: The three-layer material is compounded by hot bonding with a hot rolling machine 15. The hot rolling pressure is 30 bar, the hot rolling temperature is 90°C, and the hot rolling speed is 200 m / min.

[0077] Example 4

[0078] Reference Figure 3 , this example provides a non-woven composite structure 100, including a first non-woven fiber web layer 1, a second non-woven fiber web layer 3, and a reinforcing layer 2 arranged in sequence. The first non-woven fiber web layer 1 and the second non-woven fiber web layer 3 are polyethylene terephthalate and polylactic acid melt-blown non-woven fiber webs, and the reinforcing layer 2 is a spunbond non-woven fabric with a grammage of 45 gsm.

[0079] Other structures of the non-woven composite structure 100 in this example are the same as those in Example 1.

[0080] Reference Figure 4 , the preparation method of the non-woven composite structure 100 provided in this example is as follows:

[0081] S1: Lay the spunbond non-woven fabric flat on the forming screen 14 through a pay-off reel.

[0082] S2: Feed polyethylene terephthalate and polylactic acid into the first polymer supply system 9. After being melted at a high temperature of 275°C in the polymer supply system, they are ejected from the five-lobe spinneret holes 26 on the single-row hole spinneret 10 of "coaxial meltblowing", and after being drawn by hot air with a flow rate of 3000 m 3 / h, and then cooled by the cooling air at 15°C and dropped onto the forming screen 14 to form the first non-woven fiber web 1.

[0083] S3: Feed polyethylene terephthalate and polylactic acid into the fourth polymer supply system 13. After being melted at a high temperature of 275°C in the polymer supply system, they are ejected from the five-lobe spinneret holes 26 on the single-row hole spinneret 10 of "coaxial meltblowing", and after being drawn by hot air with a flow rate of 3000 m 3 / h, and then cooled by the cooling air at 15°C and dropped onto the forming screen 14 to form the second non-woven fiber web 3.

[0084] S4: The three-layer material is compounded by hot bonding with a hot rolling machine 15. The hot rolling pressure is 50 bar, the hot rolling temperature is 115 °C, and the hot rolling speed is 500 m / min.

[0085] Example 5

[0086] Reference Figure 5 , this example provides a non-woven composite structure 100. Both the non-woven fiber web layer and the water-absorbing layer are two layers. Both sides of the reinforcing layer 2 are connected to a water-absorbing layer, and one side of each water-absorbing layer away from the reinforcing layer 2 is connected to a non-woven fiber web layer, that is, the first non-woven fiber web layer 1, the first water-absorbing layer 6, the reinforcing layer 2, the second water-absorbing layer 7, and the second non-woven fiber web layer 3 are arranged in sequence. The first non-woven fiber web layer 1 and the second non-woven fiber web layer 3 are polypropylene melt-blown non-woven fiber webs. The first water-absorbing layer 6 and the second water-absorbing layer 7 are water-absorbing layers formed by compounding cellulose fiber 8 (such as wood pulp fiber) and polypropylene through a melt-blown process and an air-laid process. The falling direction of the wood pulp fiber and the polypropylene melt-blown non-woven web forms an angle of 30°. The reinforcing layer 2 is a mesh cloth, the mesh cloth is made of polyester fiber, the filament fineness is 500 D, the longitudinal distance and the transverse distance of the filaments in the mesh cloth are both 10 mm, and the thickness of the mesh cloth is 0.15 mm.

[0087] Other structures of the non-woven composite structure 100 in this example are the same as those in Example 2.

[0088] Reference Figure 6 , the preparation method of the non-woven composite structure 100 provided in this example is as follows:

[0089] S1: Feed polypropylene into the first polymer supply system 9. After the polypropylene is melted at a high temperature of 245 °C in the polymer supply system, it is ejected from the circular spinneret holes 23 on the multi-row spinneret plate 10 of "coaxial melt blowing". After being drawn by hot air with a flow rate of 4500 m 3 / h, and then cooled by cooling air at 20 °C and falls onto the forming curtain 14 to form the first non-woven fiber web 1.

[0090] S2: Place the wood pulp fiber in the first air-laid feeding device 18 for dispersion, and then evenly distribute it in the transverse direction. Above the forming curtain 14, it adheres and mixes with the polypropylene fibers obliquely ejected from the circular spinneret holes 23 of the multi-row spinneret plate 10 in the second polymer supply system 16. The spinneret plate 10 has circular spinneret holes 23 and finally falls onto the forming curtain 14 to form the first water-absorbing layer 6;

[0091] S3: Lay the mesh cloth flat on the first water-absorbing layer 6 through a pay-off reel.

[0092] S4: After the wood pulp fibers are placed in the second air-laid feeding device 19 and dispersed, they are evenly distributed in the transverse direction and adhesively mixed with the polypropylene fibers obliquely ejected from the multi-orifice spinneret plate 10 of "coaxial meltblowing" in the third polymer supply system 17 above the forming screen 14. The spinneret plate 10 has circular spinneret holes 23 and finally falls onto the forming screen 14 to form the second water-absorbing layer 7;

[0093] S5: Polypropylene is fed into the fourth polymer supply system 13. After the polypropylene is melted at a high temperature of 245°C in the polymer supply system, it is ejected from the circular spinneret holes 23 on the multi-orifice spinneret plate 10 of "coaxial meltblowing", and after being drawn by hot air with a flow rate of 4500 m 3 / h and then cooled by cooling air at 20°C, it falls onto the forming screen 14 to form the second nonwoven fiber web 3.

[0094] S6: The five-layer materials are compounded by thermal bonding of a hot rolling machine 15. The hot rolling pressure is 60 bar, the hot rolling temperature is 120°C, and the hot rolling speed is 300 m / min.

[0095] Example 6

[0096] Reference Figure 7 , this example provides a nonwoven composite structure 100. Both the nonwoven fiber web layer and the water-absorbing layer are two layers. Both sides of the reinforcing layer 2 are connected to a water-absorbing layer, and one side of each water-absorbing layer away from the reinforcing layer 2 is connected to a nonwoven fiber web layer, that is, the first nonwoven fiber web layer 1, the first water-absorbing layer 6, the reinforcing layer 2, the second water-absorbing layer 7, and the second nonwoven fiber web layer 3 are arranged in sequence. The first nonwoven fiber web layer 1 and the second nonwoven fiber web layer 3 are polypropylene and polyethylene terephthalate spunbond nonwoven fiber webs. The first water-absorbing layer 6 and the second water-absorbing layer 7 are water-absorbing layers formed by cellulose fibers 22 (such as short cotton fibers and short hemp fibers) and polypropylene and polyethylene terephthalate through the meltblown process and the air-laid process. The falling directions of the short cotton fibers, short hemp fibers and the polypropylene and polyethylene terephthalate meltblown nonwoven web form an angle of 60°. The reinforcing layer 2 is a mesh cloth, which is woven by polyester fiber filaments and polyethylene filaments. The filament fineness is 50 D. The longitudinal distance and the transverse distance of the filaments in the mesh cloth are both 2 mm, and the thickness of the mesh cloth is 0.02 mm.

[0097] The other structures of the nonwoven composite structure 100 in this example are the same as those in Example 2.

[0098] Reference Figure 8 , the preparation method of the nonwoven composite structure 100 provided in this example is as follows:

[0099] S1: Feed polypropylene and polyethylene terephthalate into the first polymer supply system 9. After being melted at a high temperature of 280 °C in the polymer supply system, polypropylene and polyethylene terephthalate are ejected from the spinneret 10, cooled by cooling air at 10 °C, and then fall onto the forming screen 14 after stretching to form the first non-woven fiber web 1.

[0100] S2: Place the short cotton fibers and short hemp fibers in the first air-laying feeding device 18 for loosening, and then evenly distribute them in the transverse direction. Above the forming screen 14, they are adhesively mixed with the polypropylene and polyethylene terephthalate fibers obliquely ejected from the spinneret holes 12 in the second polymer supply system 16 and the fifth polymer supply system 20. The second polymer supply system 16 and the fifth polymer supply system 20 use the double circular spinneret holes 24 on the multi-row spinneret 10 of "coaxial meltblowing" for meltblowing, and finally fall onto the forming screen 14 to form the first water-absorbing layer 6.

[0101] S3: Lay the mesh fabric flat on the first water-absorbing layer 6 through the unwinding reel.

[0102] S4: Place the short cotton fibers and short hemp fibers in the second air-laying feeding device 19 for loosening, and then evenly distribute them in the transverse direction. Above the forming screen 14, they are adhesively mixed with the polypropylene and polyethylene terephthalate fibers obliquely ejected from the spinneret holes 12 in the third polymer supply system 17 and the sixth polymer supply system 21. The third polymer supply system 17 and the sixth polymer supply system 21 use the double circular spinneret holes 24 on the multi-row spinneret 10 of "coaxial meltblowing" for meltblowing, and finally fall onto the forming screen 14 to form the second water-absorbing layer 7;

[0103] S5: Feed polypropylene and polyethylene terephthalate into the fourth polymer supply system 13. After being melted at a high temperature of 280 °C in the polymer supply system, polypropylene and polyethylene terephthalate are ejected from the spinneret 10, cooled by cooling air at 10 °C, and then fall onto the forming screen 14 after stretching to form the second non-woven fiber web 3.

[0104] S6: The five layers of materials are compounded by thermal bonding of the hot rolling machine 15. The hot rolling pressure is 90 bar, the hot rolling temperature is 120 °C, and the hot rolling speed is 100 m / min.

[0105] Example 7

[0106] Reference Figure 5, this embodiment provides a non-woven composite structure 100. Both the non-woven fiber web layer and the water-absorbing layer are two layers. Both sides of the reinforcing layer 2 are connected to one layer of the water-absorbing layer, and one side of each water-absorbing layer away from the reinforcing layer 2 is connected to one layer of the non-woven fiber web layer. That is, the first non-woven fiber web layer 1, the first water-absorbing layer 6, the reinforcing layer 2, the second water-absorbing layer 7, and the second non-woven fiber web layer 3 are arranged in sequence. The first non-woven fiber web layer 1 and the second non-woven fiber web layer 3 are polypropylene melt-blown non-woven fiber webs. The first water-absorbing layer 6 and the second water-absorbing layer 7 are water-absorbing layers formed by the melt-blown process and the air-laid process of the composite of wood pulp fibers and polypropylene. The falling directions of the wood pulp fibers and the polypropylene melt-blown non-woven web form an angle of 30°. The reinforcing layer 2 is a grid cloth, the grid cloth is made of polyethylene fibers, the filament fineness is 400D, the longitudinal distance and the transverse distance of the filaments in the grid cloth are both 5mm, and the thickness of the grid cloth is 0.13mm.

[0107] The other structures of the non-woven composite structure 100 in this embodiment are the same as those in Embodiment 2.

[0108] Reference Figure 9 , the preparation method of the non-woven composite structure 100 provided in this embodiment is as follows:

[0109] S1: Feed polypropylene into the first polymer supply system 9. After the polypropylene is melted at a high temperature of 215°C in the polymer supply system, it is ejected from the circular spinneret holes 23 on the multi-row spinneret plate 10 of "coaxial melt blowing". After being drawn by hot air with a flow rate of 5000m 3 / h and then cooled by cooling air at 20°C, it falls onto the forming curtain 14 to form the first non-woven fiber web 1.

[0110] S2: Place the wood pulp fibers in the first air-laid feeding device 18 for dispersion, and then evenly distribute them in the transverse direction. Above the forming curtain 14, they are adhesively mixed with the polypropylene fibers ejected obliquely from the circular spinneret holes 23 on the multi-row spinneret plate 10 of the "coaxial melt blowing" in the fifth polymer supply system 20, and finally fall onto the forming curtain 14 to form the first water-absorbing layer 6.

[0111] S3: Lay the grid cloth flat on the first water-absorbing layer 6 through the unwinding shaft.

[0112] S4: Place the wood pulp fibers in the second air-laid feeding device 19 for dispersion, and then evenly distribute them in the transverse direction. Above the forming curtain 14, they are adhesively mixed with the polypropylene fibers ejected obliquely from the circular spinneret holes 23 on the multi-row spinneret plate 10 of the "coaxial melt blowing" in the sixth polymer supply system 21, and finally fall onto the forming curtain 14 to form the second water-absorbing layer 7.

[0113] S5: Feed polypropylene into the fourth polymer supply system 13. After the polypropylene is melted at a high temperature of 215°C in the fourth polymer supply system 13, it is ejected from the circular spinneret holes 23 on the multi-row orifice spinneret plate 10 of "coaxial meltblowing", and after being drawn by hot air with a flow rate of 5000 m 3 / h, it is then cooled by cooling air at 20°C and falls onto the forming screen 14 to form the second non-woven fiber web 3.

[0114] S6: The five-layer materials are compounded by thermal bonding of a hot rolling machine 15. The hot rolling pressure is 45 bar, the hot rolling temperature is 110°C, and the hot rolling speed is 300 m / min.

[0115] The non-woven composite structures 100 prepared in Examples 3 to 7 and three commercially available products are subjected to a strength test under the same conditions. The three commercially available products are respectively spunbond non-woven fabric, meltblown non-woven fabric, and PP / wood pulp composite non-woven fabric. The test results are shown in Table 1. It should be noted that since it is difficult to manufacture different non-woven fabrics with the same gram weight, in this embodiment, different non-woven fabrics with similar gram weights are used for the test experiment.

[0116] It can be seen from the test results in Table 1 that the strength of the non-woven composite structure 100 in Example 3 is 1.6 times higher than that of the commercially available spunbond non-woven fabric; the strength of the non-woven composite structure 100 in Example 4 is 3.4 times higher than that of the commercially available meltblown non-woven fabric; the strength of the non-woven composite structure 100 in Example 5 is 13 times higher than that of the commercially available PP / wood pulp composite non-woven fabric; the strength of the non-woven composite structure 100 in Example 6 is 8.5 times higher than that of the PP / wood pulp composite non-woven fabric; the strength of the non-woven composite structure 100 in Example 7 is 24.4 times higher than that of the PP / wood pulp composite non-woven fabric. Under similar gram weights, the strength of the non-woven composite structure 100 of the present invention is significantly higher than that of similar products.

[0117] Table 1 Performance test results of non-woven materials prepared in Examples 3 to 7 and commercially available products

[0118]

[0119] In the present invention, specific examples are used to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A nonwoven composite structure, characterized in that: It comprises a reinforcing layer and at least two non-woven fiber mesh layers, wherein the reinforcing layer and all the non-woven fiber mesh layers are connected as a whole by a thermal bonding process; the reinforcing layer is a mesh cloth layer or a mesh non-woven cloth layer.

2. The nonwoven composite structure according to claim 1, characterized in that: It also includes at least one water-absorbing layer, and the reinforcing layer, all the non-woven fiber mesh layers and all the water-absorbing layers are connected as a whole by a thermal bonding process.

3. The nonwoven composite structure according to claim 2, characterized in that: The nonwoven fiber mesh layer and the water-absorbing layer are both two layers, both sides of the reinforcing layer are connected to one layer of the water-absorbing layer, and the side of each water-absorbing layer away from the reinforcing layer is connected to one layer of the nonwoven fiber mesh layer.

4. The nonwoven composite structure according to claim 1, characterized in that: The nonwoven fiber web layer is made by a spunbonding process or a meltblowing process.

5. The nonwoven composite structure according to claim 1, characterized in that: The nonwoven fiber web layer is a thermoplastic material layer.

6. The nonwoven composite structure according to claim 1, characterized in that: The mesh cloth layer is formed by interweaving filaments, and the material of the filaments is thermoplastic material.

7. The nonwoven composite structure according to claim 6, characterized in that: The length and width of the mesh holes in the mesh cloth layer are both 1 mm to 20 mm, and the thickness of the mesh cloth layer is 0.01 mm to 2 mm.

8. The nonwoven composite structure according to claim 6, characterized in that: The fineness of the filament is 10D to 1500D.

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