Composite non-woven fabric with two surfaces different in roughness

Abstract

The composite non-woven fabric with the two sides different in roughness comprises a body formed by a plurality of composite layers, the body comprises a first surface formed by first fibers and a second surface formed by second fibers, the roughness of the first surface is smaller than or equal to 70% of the roughness of the second surface, the diameter of the first fibers ranges from 0.7 micrometer to 1.2 micrometers, and the diameter of the second fibers ranges from 0.7 micrometer to 1.2 micrometers. The diameter of the second fiber is 2.5-5.0 [mu] m, the composite layer comprises a middle matrix layer mainly formed by natural fiber, an upper matrix layer and a lower matrix layer, the upper matrix layer and the lower matrix layer are mainly formed by hot-melt fiber, and the body further comprises a fusion point formed by combining the hot-melt fiber of the upper matrix layer and the hot-melt fiber of the lower matrix layer. By means of the arrangement, one side of the composite non-woven fabric has good touch feeling and better wiping performance, and in addition, due to the fact that the first surface is held in the wiping process, the touch feeling and comfort of a user in the using process are improved.

Description

Technical Field

[0001] The utility model relates to a composite non-woven fabric with two sides having different roughnesses. Background Art

[0002] Meltblown-wood pulp composite non-woven fabric, also known as twin-spinning fabric, is a composite material formed by meltblown fibers and wood pulp fibers through an airflow composite process. This material has been used in many fields since it was first used in the 1990s.

[0003] The material usually includes meltblown fibers on the surface and bottom layers and wood pulp fibers sandwiched by the meltblown fibers, such as the structures and processes shown in patent documents No. CN1087392A, CN1113994A, CN101978107A, etc. The material has a good surface touch and has certain degradable and flushable properties, making it particularly suitable for the wet wipes field.

[0004] In the process of applying these materials, it was found that some users also hope that these wiping materials such as wet wipes can not only be used for cleaning and wiping the skin, but also hope that they can be used for wiping and cleaning the surface of objects such as desktops. However, the requirements for wiping objects are contrary to those for wiping skin, especially the requirements for the surface. When wiping the skin, it needs to be as close to the skin and smooth as possible, while wiping objects requires to be as rough as possible to increase the cleaning ability. Therefore, the existing composite non-woven fabrics cannot meet the needs of wiping skin and wiping objects at the same time. Utility Model Content

[0005] To this end, the utility model provides a composite non-woven fabric with two sides having different roughnesses to solve the above technical problems.

[0006] A composite nonwoven fabric with different roughness on both sides, comprising: a body formed by a plurality of composite layers, the body comprising a first surface formed by first fibers and a second surface formed by second fibers, the roughness of the first surface being less than or equal to 70% of the roughness of the second surface, the diameter of the first fibers being 0.7 μm to 1.2 μm, the diameter of the second fibers being 2.5 to 5.0 μm, the plurality of composite layers comprising a middle matrix layer mainly formed by natural fibers, and an upper matrix layer and a lower matrix layer mainly formed by hot-melt fibers located on both sides of the natural fiber layer, the body further comprising a fusion point formed by combining the hot-melt fibers of the upper matrix layer with the hot-melt fibers of the lower matrix layer.

[0007] Among them, the main body includes a base layer, and the base layer includes a middle base layer mainly formed by natural fibers and an upper base layer mainly formed by the first hot-melt fiber and a lower base layer mainly formed by the second hot-melt fiber on both sides of the natural fiber layer. The first hot-melt fiber and the second hot-melt fiber include upper and lower hot melting points. The composite layer has three layers, the first fiber is the first hot-melt fiber, and the second fiber is the second hot-melt fiber.

[0008] Wherein, at least a portion of the first hot-melt fibers and the natural fibers include inner welding points.

[0009] Among them, the main body includes a base layer and a surface layer arranged on the base layer, the base layer includes a middle base layer mainly formed by natural fibers, and an upper base layer mainly formed by the first hot-melt fiber and a lower base layer mainly formed by the second hot-melt fiber on both sides of the natural fiber layer, the first hot-melt fiber and the second hot-melt fiber include upper and lower hot melting points, the surface layer is mainly formed by surface layer fibers, the first fiber is the surface layer fiber, and the surface layer is arranged on the upper side of the upper base layer.

[0010] Wherein, the second fiber is a second hot-melt fiber, the upper base layer includes a plurality of first pores, and at least a portion of the surface layer fibers extend into the first pores and combine with the first hot-melt fibers.

[0011] Wherein, a third welding point is included between the surface layer fiber and the first hot-melt fiber.

[0012] Wherein, a fourth welding point is included between the surface layer fibers and the natural fibers.

[0013] Wherein, the diameters of the first hot-melt fiber and the second hot-melt fiber are equal.

[0014] Wherein, the main body also includes a bottom layer arranged at the lower side of the base layer, the bottom layer is mainly formed by bottom layer fibers, the surface layer and the bottom layer are arranged back to back, and the second fibers are bottom layer fibers.

[0015] Wherein, the bottom layer fiber has the same diameter as the first hot-melt fiber and the second hot-melt fiber.

[0016] Beneficial effect: The utility model provides a composite non-woven fabric with different roughness on two sides, comprising: a main body formed by a plurality of composite layers, the main body comprising a first surface formed by first fibers and a second surface formed by second fibers, the roughness of the first surface is less than or equal to 70% of the roughness of the second surface, the diameter of the first fibers is 0.7μm~1.2μm, the diameter of the second fibers is 2.5~5.0μm, the plurality of composite layers include a middle matrix layer mainly formed by natural fibers, and an upper matrix layer and a lower matrix layer mainly formed by hot-melt fibers on both sides of the natural fiber layer, the main body also includes a welding point formed by combining the hot-melt fibers of the upper matrix layer and the hot-melt fibers of the lower matrix layer. This arrangement enables the composite non-woven fabric to have a good touch on one side and a better wiping performance on the other side. In addition, since the first surface is held during wiping, the touch and comfort of the user during use are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the composite nonwoven structure of the first embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the composite nonwoven structure of the second embodiment of the utility model;

[0019] Figure 3 A schematic diagram of the composite nonwoven structure of the third embodiment of the utility model;

[0020] Component Description:

[0021] Base 10, 20, 30;

[0022] Ontology 100, 200, 300;

[0023] First surface 101, 201, 301;

[0024] Second surface 102, 202, 302;

[0025] Upper and lower welding points 103, 203, 303;

[0026] Upper substrate layer 11, 21, 31;

[0027] First hot-melt fibers 111, 211, 311;

[0028] First welding point 112;

[0029] Inside welding point 113;

[0030] Middle matrix layer 12, 22, 32;

[0031] Natural fibers 121, 221, 321;

[0032] Lower base layer 13, 23, 33;

[0033] Second hot-melt fibers 131, 231, 331;

[0034] Second welding point 132;

[0035] first pore 212212;

[0036] Surface layer 24, 34;

[0037] Surface fiber 241;

[0038] Surface layer welding point 242;

[0039] The third welding point 243;

[0040] Fourth welding point 244.

[0041] bottom 35;

[0042] Bottom layer fiber 351. DETAILED DESCRIPTION

[0043] The embodiment of the utility model provides a composite non-woven fabric with different roughness on two sides, and the roughness of the two sides differs by more than 30%, so that one side of the composite non-woven fabric is skin-friendly and smooth, and the other side has better cleaning ability, thereby satisfying both skin-friendly and cleaning requirements. The composite non-woven fabric includes a main body 100.

[0044] The main body 100 includes a first surface 101 formed by first fibers and a second surface 102 formed by second fibers. The roughness of the first surface 101 is less than or equal to 70% of the roughness of the second surface 102. The diameter of the first fiber is 0.7μm~1.2μm, and the diameter of the second fiber is 2.5~5.0μm. The multiple composite layers include a middle matrix layer 12 mainly formed by natural fibers 121 and an upper matrix layer 11 and a lower matrix layer 13 located on both sides of the middle matrix layer 12 and mainly formed by hot-melt fibers. The main body 100 also includes a fusion point formed by combining the hot-melt fibers of the upper matrix layer 11 and the hot-melt fibers of the lower matrix layer 13.

[0045] The composite nonwoven fabric of the present invention is described in detail below with reference to specific embodiments.

[0046] First embodiment:

[0047] Please refer to Figure 1 ,exist Figure 1, a schematic diagram of the composite nonwoven fabric structure of the first embodiment is shown, the main body 100 includes a base layer 10, and the base layer 10 includes three composite layers, including an upper base layer 11 mainly formed by first hot-melt fibers 111, a lower base layer 13 mainly formed by second hot-melt fibers 131, and a middle base layer 12 located between the upper base layer 11 and the lower base layer 13 and mainly formed by natural fibers 121.

[0048] The “mainly” means that the content of the first meltblown fibers in the upper substrate layer 11 is greater than 70%, the content of the second meltblown fibers in the lower substrate layer 13 is greater than 70%, and the content of the natural fibers 121 in the middle substrate layer 12 is greater than 70%.

[0049] It can be understood that in this embodiment, the first surface 101 is the upper surface of the upper substrate layer 11 , the second surface 102 is the lower surface of the lower substrate layer 13 , the first fiber is the first hot-melt fiber 111 , and the second fiber is the second hot-melt fiber 131 .

[0050] Furthermore, the diameter of the first hot-melt fiber 111 is 0.1μm to 1.10μm, and the diameter of the second hot-melt fiber 131 is 2.8μm to 5.5μm, so that the roughness of the first surface 101 is lower and the roughness of the second surface 102 is higher. Preferably, the roughness of the first surface 101 is less than or equal to 70% of the roughness of the second surface 102, more preferably, less than or equal to 60% of the roughness of the second surface 102, or further less than or equal to 50% of the roughness of the second surface 102.

[0051] Typically, a first hot-melt fiber 111 can be provided through an upper die to form a first hot-melt fiber flow, a second hot-melt fiber 131 can be provided through a lower die to form a second hot-melt fiber flow, and a natural fiber 121 can be provided through a middle nozzle to form a natural fiber flow. The first hot-melt fiber flow, the natural fiber flow and the second hot-melt fiber flow collide and merge in a forming area to form a base layer 10 having an upper base layer 11, a middle base layer 12 and a lower base layer 13. At the same time, during the collision process, several first hot-melt fibers 111 are combined, or several second hot-melt fibers 131 are combined, or the first hot-melt fiber 111 and the second hot-melt fiber 131 are combined.

[0052] It can be understood that the first hot-melt fibers 111 are welded to form the first welding point 112, the second hot-melt fibers 131 are welded to form the second welding point 132, and in the process of combining the first hot-melt fibers 111 and the second hot-melt fibers 131, at least a portion of the first hot-melt fibers 111 and the second hot-melt fibers 131 are welded to form upper and lower welding points 103, and the upper and lower welding points 103 are used to form the base layer 10 as a whole. At the same time, the natural fibers 121 are surrounded by the first hot-melt fibers 111 and the second hot-melt fibers 131, thereby reducing the probability of the natural fibers 121 detaching from the base layer 10.

[0053] Furthermore, at least a portion of the first hot-melt fibers 111 and the natural fibers 121 form inner fusion points 113 to further fix the natural fibers 121 and reduce the probability of the natural fibers 121 detaching from the base layer 10 .

[0054] Furthermore, the middle matrix layer 12 includes a plurality of pores, and the first hot-melt fibers 111 extend into the pores and form a bond with the natural fibers 121 .

[0055] It can be understood that the natural fiber 121 can be one or more of viscose fiber, wood pulp fiber, sugarcane fiber, silk fiber, wool fiber or cotton fiber. Preferably, the natural fiber 121 is wood pulp fiber. More specifically, the wood pulp fiber can be coniferous wood pulp fiber or broadleaf wood pulp fiber, and more preferably coniferous wood fluff pulp fiber.

[0056] Furthermore, the diameter of the natural fiber 121 is greater than or equal to 10 μm to reduce the probability of the natural fiber 121 detaching from the base layer 10 . Furthermore, the diameter of the natural fiber 121 is greater than 30 μm.

[0057] It can be understood that the first hot-melt fiber 111 and the second hot-melt fiber 131 can be obtained by melt-blowing a thermoplastic polymer through an upper die head and a lower die head. Specifically, the thermoplastic polymer suitable for this embodiment may include polyolefins, such as polyethylene, polypropylene, polybutylene, etc., polyamide, olefin copolymers and polyesters. Preferably, the thermoplastic polymer is polypropylene. More preferably, when forming the base layer 10, the thermoplastic polymers passed into the upper die head and the lower die head are the same.

[0058] More specifically, the thermoplastic polymer can be melt-blown in the following manner: the upper die head and the lower die head include a plurality of spinneret holes, and a heating device and an air flow outlet are arranged around the spinneret holes, and the air flow outlet is used to blow out a drawing air flow. More specifically, the heating device is configured to heat the air to form a hot air flow blown out from the air flow outlet, that is, the drawing air flow is a hot air air flow. When the molten thermoplastic polymer in the upper die head and the lower die head is extruded from the spinneret holes, the drawing air flow entrains and pulls the molten filaments, and is drawn into fine fibers that are usually smaller than the diameter of the spinneret holes, or is drawn into small-diameter microfibers depending on the degree of drawing. It can be understood that in this embodiment, the fine fibers or microfibers coming out of the spinneret holes of the upper die head are first melt-blown fibers, and the fine fibers or microfibers coming out of the spinneret holes of the lower die head are called second melt-blown fibers. Preferably, the drawing air flow has a temperature of 200°C to 300°C, so that at least a part of the fine fibers or microfibers are in a molten state during the movement of the air flow.

[0059] An extruder is also arranged upstream of the upper die and the lower die. Usually, the extruder is a screw extrusion device including an extrusion screw. When the thermoplastic polymer moves toward the upper die or the lower die under the action of the extrusion screw of the screw extrusion device, the thermoplastic polymer is also heated to a molten state during the extrusion process so that the thermoplastic polymer moves in a flowing state and the thermoplastic polymer can spray out molten filaments from the spinneret hole. In a specific embodiment, the heating temperature of the extruder is configured to be 180°C to 260°C, and more preferably, it is configured to be 200°C to 250°C.

[0060] Before providing the natural fiber 121 through the middle-layer nozzle and forming the natural fiber 121 flow, a crushing device can be set up to analyze the fiber raw material such as a paddle or a pulp board to form discrete natural fibers 121. Usually, the crushing device can be a toothed roller with a plurality of teeth. After the fiber raw material is transported into the crushing device, the teeth on the toothed roller defibrate the flaky raw material to form discrete natural fibers 121.

[0061] Furthermore, after forming the base layer 10, a pulse airflow can be set to blow toward the base layer 10 in a direction nearly perpendicular to or perpendicular to the first surface 101, so that at least a portion of the first hot-melt fibers 111 are bent toward the middle base layer 12, thereby forming more upper and lower welding points 103, so that the natural fibers are more fixed, and the upper base layer 11 and the first surface 101 have a better touch.

[0062] Second embodiment:

[0063] Please refer to Figure 2 , Figure 2A composite nonwoven fabric of a second embodiment is shown, wherein the composite nonwoven fabric comprises a main body 200, wherein the main body 200 comprises a base layer 20 and a surface layer 24 arranged on the base layer 20, and the structure of the base layer 20 is substantially the same as the base layer 10 in the first embodiment, that is, the base layer 10 also comprises an upper base layer 21 mainly formed of first hot-melt fibers 211, a lower base layer 23 mainly formed of second hot-melt fibers 231, and a middle base layer 22 mainly formed of natural fibers 221 and located between the upper base layer 21 and the lower base layer 23.

[0064] The surface layer 24 is arranged on the upper base layer 21, so that the composite layer described in this embodiment has a total of four layers. The surface layer 24 is formed by surface layer fibers 241. It can be understood that in this embodiment, the first surface 201 is the upper surface of the surface layer 24, the second surface 202 is the lower surface of the lower base layer 23, the first fiber is the surface layer fiber 241, and the second fiber is the second hot-melt fiber 231.

[0065] In this embodiment, the diameter of the surface layer fiber 241 is 0.1 μm to 1.10 μm, and the diameter of the second hot-melt fiber 231 is 2.8 μm to 5.5 μm, so that the roughness of the first surface 201 is lower and the roughness of the second surface 202 is higher.

[0066] It can be understood that surface layer welding points 242 are formed between the surface layer fibers 241 so that the surface layer 24 forms a whole.

[0067] Furthermore, the upper base layer 21 includes a plurality of first pores 212, at least a portion of the surface fibers 241 extend into the first pores 212 and form a bond with the first hot-melt fibers 211, the bond may be a mechanical bond or a bond formed by hot melting, the mechanical bond may be a bond formed by entanglement, and when the surface fibers 241 and the first hot-melt fibers 211 are bonded by hot melting, a third fusion point 243 is formed between the surface fibers 241 and the first hot-melt fibers 211.

[0068] Furthermore, at least a portion of the surface fibers 241 extend into the middle matrix layer 22 and form a bond with the natural fibers 221. Similarly, the surface fibers 241 can be bonded with the natural fibers 221 by mechanical bonding or hot melting. When the surface fibers 241 and the natural fibers 221 are bonded by hot melting, a fourth welding point 244 is formed between the surface fibers 241 and the natural fibers 221.

[0069] Furthermore, in this embodiment, the diameter of the first hot-melt fiber 211 is the same as the diameter of the second hot-melt fiber 231 .

[0070] It can be understood that the first hot-melt fiber 211 and the second hot-melt fiber 231 include upper and lower welding points 203, so that the base layer 20 forms a whole. At the same time, the above-mentioned setting can make the surface layer 24 and the base layer 20 form a whole, and the natural fiber 221 can be fixed in the base layer 20, reducing the probability of the natural fiber 221 falling off the main body 200.

[0071] It is understandable that after forming the base layer 20, a surface layer 24 can be formed by a surface layer 24 die head, and the surface layer 24 can be laid on the base layer 20. The structure of the surface layer 24 die head is basically the same as that of the upper layer die head and the lower layer die head. Specifically, the surface layer 24 die head also includes a plurality of spinnerets, and a heating device and an air flow outlet are arranged around the spinneret. The air flow outlet is used to blow out a drawing airflow. The heating device is configured to heat the air to form a hot air flow to be blown out from the air flow outlet, that is, the drawing airflow is a hot air airflow. When the molten thermoplastic polymer in the surface layer 24 die head is extruded from the spinneret hole, the drawing airflow entrains and pulls the molten filaments, and is drawn into fine fibers that are usually smaller than the diameter of the spinneret hole, or is drawn into small diameter microfibers depending on the degree of drawing. It is understandable that in this embodiment, the fine fibers or microfibers coming out of the spinneret hole of the surface layer 24 die head are surface layer fibers 241.

[0072] In addition, the thermoplastic polymer used to form the surface layer fibers 241 may be the same as that used to form the first hot-melt fibers 211 and the second hot-melt fibers 231 .

[0073] Third embodiment:

[0074] Please refer to Figure 3 , Figure 3 A composite nonwoven fabric of a third embodiment is shown. In this embodiment, the composite nonwoven fabric includes a main body 300, and the main body 300 includes a base layer 30 and a surface layer 34 arranged on the upper side of the base layer 30, and a bottom layer 35 arranged on the lower side of the base layer 30, that is, the main body 300 includes five composite layers. The structure of the surface layer 34 is basically the same as the structure of the surface layer 24 in the second embodiment, and the structure of the base layer 30 is basically the same as the structure of the base layer 20 in the second embodiment. Similarly, the base layer 30 includes an upper base layer 31 mainly formed by first hot-melt fibers 311, a lower base layer 33 mainly formed by second hot-melt fibers 331, and a middle base layer 32 located between the upper base layer 31 and the lower base layer 33 and mainly formed by natural fibers 321.

[0075] The bottom layer 35 is arranged on the lower side of the lower base layer 33, and the bottom layer 35 is mainly formed by the bottom layer fibers 351. It can be understood that the surface layer 34 is mainly formed by the surface layer fibers 341. In this embodiment, the first surface 301 is the upper surface of the surface layer 34, and the second surface 302 is the lower surface of the bottom layer 35. The first fiber is the surface layer fiber 241, and the second fiber is the bottom layer fiber 351.

[0076] In this embodiment, the diameter of the surface layer fibers 341 is 0.1 μm to 1.10 μm, and the diameter of the bottom layer fibers 351 is 2.8 μm to 5.5 μm, so that the roughness of the first surface 301 is lower and the roughness of the second surface 302 is higher.

[0077] Furthermore, the diameters of the first hot-melt fiber 311 and the second hot-melt fiber 331 are substantially the same.

[0078] Furthermore, the diameter of the bottom layer fiber 351 is substantially the same as that of the first hot-melt fiber 311 and the second hot-melt fiber 331. In this case, the first surface 301 formed by the surface layer fiber 341 has a better touch. At the same time, since the first hot-melt fiber 311, the second hot-melt fiber 331 and the bottom layer fiber 351 are all thicker than the surface layer fiber 341, the second surface 302 is relatively stiffer, has stronger support and forms a greater roughness, thereby facilitating cleaning and wiping the surface of the object. In addition, since the first surface 301 is held during wiping, the user's touch and comfort during use are improved.

[0079] It can be understood that the first hot-melt fiber 311 and the second hot-melt fiber 331 may include upper and lower welding points 303 to fix the natural fiber 321. In addition, the bottom fiber 351 and the second hot-melt fiber 331 may also be combined to reduce the stratification phenomenon between the bottom layer 35 and the base layer 10, thereby facilitating use.

[0080] It can be understood that before forming the base layer 30, the base layer 35 can be formed by a base layer 35 die head, and the base layer 30 can be laid on the base layer 35 paper. At the same time, after forming the base layer 30, the surface layer 34 can be formed by a surface layer 34 die head, and the surface layer 34 can be laid on the base layer 30. The structures of the base layer 35 die head and the surface layer 34 die head are basically the same as those of the upper layer die head and the lower layer die head, and they will not be repeated here.

[0081] The above description is only an implementation method of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present utility model.

Claims

1. A composite nonwoven fabric with different roughness on both sides, comprising: A body formed by a plurality of composite layers, characterized in that the body comprises a first surface formed by first fibers and a second surface formed by second fibers, the roughness of the first surface is less than or equal to 70% of the roughness of the second surface, the diameter of the first fibers is 0.7 μm to 1.2 μm, and the diameter of the second fibers is 2.5 to 5.0 μm, the body comprises a base layer, the base layer comprises a middle base layer mainly formed by natural fibers and an upper base layer mainly formed by first hot-melt fibers and a lower base layer mainly formed by second hot-melt fibers located on both sides of the natural fiber layer, the first hot-melt fibers and the second hot-melt fibers are respectively The hot-melt fibers include upper and lower hot melting points, the first fiber is the first hot-melt fiber, and the second fiber is the second hot-melt fiber, or the body also includes a surface layer arranged on the base layer, the surface layer is mainly formed by surface layer fibers, the surface layer is arranged on the upper side of the upper substrate layer, the first fiber is the surface layer fiber, when the body does not include the surface layer, the first surface is the upper surface of the upper substrate layer, and the second surface is the lower surface of the lower substrate layer, when the body includes the surface layer, the first surface is the upper surface of the surface layer, and the second surface is the lower surface of the lower substrate layer.

2. The composite nonwoven fabric according to claim 1, characterized in that At least a portion of the first heat-fusible fibers include inner fusion points with the natural fibers.

3. The composite nonwoven fabric according to claim 2, characterized in that: The upper substrate layer comprises a plurality of first pores, and at least a portion of the surface layer fibers extend into the first pores and are combined with the first hot-melt fibers.

4. The composite nonwoven fabric according to claim 3, characterized in that: The surface layer fibers and the first hot-melt fibers include a third fusion point.

5. The composite nonwoven fabric according to claim 4, characterized in that: The surface layer fibers and the natural fibers include a fourth welding point.

6. The composite nonwoven fabric according to claim 3, characterized in that: The main body also includes a bottom layer arranged at the lower side of the base layer, the bottom layer is mainly formed by bottom layer fibers, the surface layer and the bottom layer are arranged back to back, and the second fibers are bottom layer fibers.

7. The composite nonwoven fabric according to claim 6, characterized in that: The bottom layer fibers and the second hot-melt fibers have the same diameter.

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