CN115852592A - Nonwoven composite sheet and method of making same - Google Patents
Nonwoven composite sheet and method of making same Download PDFInfo
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- CN115852592A CN115852592A CN202211556247.2A CN202211556247A CN115852592A CN 115852592 A CN115852592 A CN 115852592A CN 202211556247 A CN202211556247 A CN 202211556247A CN 115852592 A CN115852592 A CN 115852592A
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- 239000002131 composite material Substances 0.000 title claims abstract description 69
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 239000000835 fiber Substances 0.000 claims abstract description 170
- 239000010410 layer Substances 0.000 claims abstract description 50
- 239000012792 core layer Substances 0.000 claims abstract description 29
- 239000004751 flashspun nonwoven Substances 0.000 claims abstract description 26
- 239000002344 surface layer Substances 0.000 claims abstract description 20
- 229920001474 Flashspun fabric Polymers 0.000 claims abstract description 15
- 230000035699 permeability Effects 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 25
- 238000009987 spinning Methods 0.000 claims description 16
- 229920001903 high density polyethylene Polymers 0.000 claims description 14
- 239000004700 high-density polyethylene Substances 0.000 claims description 14
- 229920001684 low density polyethylene Polymers 0.000 claims description 14
- 239000004702 low-density polyethylene Substances 0.000 claims description 14
- 238000003490 calendering Methods 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 5
- 238000007731 hot pressing Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 239000004745 nonwoven fabric Substances 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 14
- 238000009472 formulation Methods 0.000 description 6
- 238000009751 slip forming Methods 0.000 description 5
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 4
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- 238000003756 stirring Methods 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 239000002657 fibrous material Substances 0.000 description 1
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Abstract
The application relates to the technical field of non-woven fabric preparation, in particular to a non-woven composite sheet and a preparation method thereof. The non-woven composite sheet comprises a first surface layer, a core layer and a second surface layer; the first surface layer and the second surface layer are made of flash spun fibers; the core layer is made of spun-bonded fibers; the ratio of the grammage of the core layer to the total grammage is 10% or more and 30% or less. The application provides a non-woven composite sheet adopts sandwich layer spunbonded fiber as the skeleton, under the prerequisite that does not influence the performance of material itself, has obviously promoted non-woven composite sheet's tensile fracture brute force and tearing brute force, has promoted non-woven composite sheet's deflection simultaneously. In addition, the core layer spun-bonded fiber is low-melting-point fiber, and after the spun-bonded fiber is fused and cohered, the form of the flash-spun fiber is not obviously changed, so that the stripping strength of the non-woven composite sheet is also obviously improved, and the non-woven composite sheet has high air permeability.
Description
Technical Field
The application relates to the technical field of non-woven fabric preparation, in particular to a non-woven composite sheet and a preparation method thereof.
Background
In the prior art, a method for simultaneously ensuring the peel strength and opacity of flash spun sheets is to add pigment to the raw material slices, for example, patent CN1090260C "improved flash spun sheet", which discloses an improved sheet consisting of bonded plexifilamentary film-fibril strands spun from polyolefin and pigment. The polyolefin comprises at least 90% by weight of the fibril strands and the pigment comprises from 0.05 to 10% by weight of the fibril strands. The sheet has a high opacity even after being bonded to a delamination strength greater than 120N/m. Although this method is feasible, the sheet material added with the pigment is not favorable for recycling, is not favorable for the reuse of the material, and affects the environmental protection property of the sheet material.
Disclosure of Invention
For the flash evaporation method non-woven fabric, in order to ensure the characteristics of the non-woven fabric as paper and have certain stiffness, hot-rolling polishing (press polishing) treatment needs to be carried out on the non-woven fabric so as to enable the fibers to be thermally bonded; but in order to ensure that the material has certain air permeability, too high temperature and pressure cannot be adopted, otherwise, the fibers of the whole vertical surface layer are melted, so that the vertical surface layer has no air permeability, the opacity of the material is reduced, and the tearing strength is obviously reduced; but the temperature and pressure can not be low, otherwise, only the surface of the cloth is thermally bonded, although the air permeability, the opacity and the tearing strength are kept, the stiffness of the material is obviously insufficient, and the upper and lower thermal bonding layers and the middle pure fiber layer are formed, so that the upper and lower layers of the cloth are easy to peel off, and the use of the product is not facilitated.
To address the deficiencies, the present application provides a nonwoven composite sheet comprising
A first surface layer, a core layer and a second surface layer.
The first skin layer and the second skin layer are made of flash spun fibers. The core layer is made of spunbond fibers.
The ratio of the grammage of the core layer to the total grammage is 10% or more and 30% or less.
In one embodiment, the flash spun fiber material is high density polyethylene, and the melting point of the high density polyethylene is 130 ℃ or higher and 135 ℃ or lower. The spun-bonded fiber raw material adopts low-density polyethylene, and the melting point of the low-density polyethylene is more than or equal to 100 ℃ and less than or equal to 110 ℃.
In one embodiment, the overall total grammage is greater than or equal to 40g/m 2 And 120g/m or less 2 。
In one embodiment, the grammage of the core layer is greater than or equal to 11% and less than or equal to 20% of the total grammage. More preferably, the ratio of the grammage of the core layer to the total grammage is 15% or more and 20% or less.
In one embodiment, the grammage of the first skin layer and the second skin layer is greater than or equal to 10% and less than or equal to 80% of the total grammage, respectively.
Preferably, the grammage of the first skin layer and the second skin layer is the same in the total grammage.
Preferably, the first skin layer and the second skin layer have different grammage ratios in the total grammage. Further, the ratio of the grammage of the first surface layer and the second surface layer in the total grammage is not more than 15%.
In one embodiment, the stiffness is equal to or greater than 20mN.cm and equal to or less than 45mN.cm.
In one embodiment, the air permeability is 18mm/s or more and 40mm/s or less.
The present application also provides a method of making a nonwoven composite sheet as described in any of the above, comprising the steps of:
flash spinning fiber raw materials are subjected to flash evaporation and spraying to prepare a fiber mesh sheet, and the fiber mesh sheet forms a fiber mesh on a mesh curtain;
carrying out cold pressing on the fiber mesh, and condensing the molten spun-bonded fibers on the cold-pressed fiber mesh to obtain a two-layer composite fiber mesh;
cold pressing the two-layer composite fiber net, and laying a fiber mesh sheet made of flash spun fibers on the surface of the spun-bonded fibers of the cold-pressed two-layer composite fiber net to obtain a three-layer composite fiber net;
and (3) pre-hot pressing the three-layer composite fiber net, and then shaping by hot air and hot calendering to obtain the non-woven composite sheet.
In one embodiment, the hot air setting temperature is above the melting point of the spunbond fibers and below the melting point of the flash spun fibers.
In one embodiment, the web is specifically prepared by the process of: mixing the high-density polyethylene slices and a solvent matched with the high-density polyethylene slices in a high-temperature high-pressure reaction kettle, dissolving to form a uniform solution, spraying the uniform solution through a spinneret orifice of a spray head to form a fiber bundle containing a plurality of superfine fibers, refracting and dispersing the fiber bundle into a fiber mesh sheet in a mesh sheet-shaped structure through a rotary filament separating plate, and laying the continuously formed fiber mesh sheet on a movable net curtain to form a fiber mesh sheet with a certain gram weight and width.
In one embodiment, the two-layer composite fiber web is prepared by the following specific steps: adding low-density polyethylene slices into a screw extruder, heating and melting the low-density polyethylene slices through the screw extruder, quantitatively metering the low-density polyethylene slices by a metering pump, extruding the low-density polyethylene slices through a die head to form spinning trickle, drafting the spinning trickle into fibers under the action of strong wind force, and condensing the fibers on a flash spinning fiber net conveyed from the previous process to form a two-layer composite fiber net.
In one embodiment, the three-layer composite fiber web is prepared by the following specific steps: mixing high-density polyethylene slices and a solvent matched with the high-density polyethylene slices in a high-temperature high-pressure reaction kettle, dissolving to form a uniform solution, spraying the uniform solution through a spinneret orifice of a spray head to form a fiber bundle containing a plurality of superfine fibers, refracting and dispersing the fiber bundle into a fiber mesh sheet in a mesh sheet-shaped structure through a rotary filament separating plate, laying the continuously formed fiber mesh sheet on a two-layer composite fiber mesh conveyed by a previous process, and laying a layer of flash spinning fibers on spun-bonded fibers of a core layer to obtain the three-layer composite fiber mesh.
Preferably, the surface temperature of the hot-rolled and polished roller is more than or equal to 120 ℃ and less than or equal to 150 ℃, the oil pressure of the roller is 1.5-5.0 MPa, and the surface speed of the roller is 20-60 m/min.
Preferably, the diameter of the spunbond fibers is 15 μm or more and 25 μm or less, and the diameter of the flash spun fibers is 0.5 μm or more and 2 μm or less.
Based on the above, compared with the prior art, the embodiment of the application has the following beneficial effects:
1. the non-woven composite sheet material provided by the embodiment of the application adopts the spun-bonded fibers in the material core layer, the spun-bonded fibers are thick, the arrangement among the fibers is sparse, when the fibers are melted after being heated, if the thin fibers are densely arranged by adopting a flash spinning method or a melt-blowing method and the like, the thin fibers are mutually connected into a piece, and an airtight film is formed. The thicker spun-bonded fibers are arranged sparsely, so that more holes can be reserved when the fibers are melted, and the air permeability of the whole non-woven composite sheet is ensured. Meanwhile, after the spunbond fibers are melted and cooled, solidified and crystallized, a framework structure can be formed, and the stiffness of the non-woven composite sheet is improved.
2. According to the embodiment of the application, the core layer spun-bonded fibers are used as the framework, so that the tensile fracture strength and the tearing strength of the non-woven composite sheet are obviously improved on the premise of not influencing the use performance of the material, and the stiffness of the non-woven composite sheet is improved. In addition, the core layer spun-bonded fiber is low-melting-point fiber, and after the spun-bonded fiber is fused and cohered, the form of the flash-spun fiber is not obviously changed, so that the stripping strength of the non-woven composite sheet is also obviously improved, and the non-woven composite sheet has high air permeability.
3. According to the preparation method adopted by the embodiment of the application, when the three-layer composite fiber net is subjected to heat setting, the spun-bonded fibers of the low-density polyethylene of the core layer are partially melted, the form of the flash-spun fibers is basically not changed, and thus the melted fibers can firmly hold the upper and lower layers of flash-spun fibers together. After the three-layer composite fiber net is shaped and cooled, the molten spun-bonded fibers are solidified and crystallized again to form a skeleton structure, and the stiffness of the product is effectively improved. Finally, hot calendering the upper surface and the lower surface of the shaped three-layer composite fiber net to enable the flash-spun fibers of the first surface layer and the second surface layer to be thermally bonded on the surfaces and form a smooth surface, so that the fibers of the vertical surface of the non-woven composite sheet are bonded, the fibers in the non-woven composite sheet still keep the fiber shape, and the integral air permeability and mechanical performance are guaranteed.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts. In the following description, the drawings are described with reference to the drawing direction of the elements in the drawings unless otherwise specified.
Fig. 1 is a schematic structural diagram according to an embodiment of the present application.
FIG. 2 is a schematic flow chart of a preparation method according to an embodiment of the present application
Reference numerals:
100 first skin 200 core 300 second skin
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The technical features as designed in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, and should not be construed as limiting the present application. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Example 1:
selecting a certain type of HDPE slices of medium petrochemical industry, adding the HDPE slices with the mass concentration of 15% and a solvent (a mixture of 15% of difluoromethane (R22) and 85% of tetrafluorodichloroethane (R114)) with the mass concentration of 85% into a high-pressure reaction kettle at the same time, and heating to 180 ℃. After the temperature rise is finished, introducing nitrogen gas, pressurizing to 12MPa, simultaneously raising the temperature to 230 ℃, and stirring for 2 hours at the stirring speed of 100r/min. After the temperature is stable, a uniform spinning solution is formed in the high-pressure reaction kettle. The uniform solution is sprayed out through a spinneret orifice of a spray head to form a fiber bundle containing a plurality of superfine fibers, the fiber bundle is refracted and dispersed into a fiber mesh sheet in a mesh sheet-shaped structure through a rotary filament separating plate, the continuously formed fiber mesh sheet is laid on a movable net curtain to form a fiber mesh, the fiber mesh enters the next process after being cooled and pressed, and the gram weight of the flash spinning fiber layer is 20g/m 2 。
The LDPE slices of a certain type of the medium-petrochemical industry are heated and melted through a screw extruder, are quantitatively metered through a metering pump and are extruded through a die head to form a spinning trickle, the spinning trickle is drawn into fibers under the action of strong wind force, and the fibers are condensed on a flash spinning fiber net conveyed from the previous process to form a two-layer composite fiber net. And (4) the composite fiber net enters the next procedure after cold pressing. The gram weight of the fiber of the spunbond layer is 20g/m 2 The gram weight of the composite fiber web with the two-layer structure is 40g/m 2 。
Preparing a uniform spinning solution according to the same formula of the step 1. The uniform solution is sprayed out through a spinneret orifice of a spray head to form a fiber bundle containing a plurality of superfine fibers, the fiber bundle is refracted and dispersed into a fiber mesh with a mesh-shaped structure through a rotary filament dividing plate, and the continuously formed fibersThe fiber net sheet is laid on the composite fibers conveyed from the previous process, and the newly formed flash spun fibers are laid above the spun-bonded fiber net to form the composite fiber net with a three-layer structure. The composite fiber web is subjected to pre-hot pressing (the surface temperature of a press roll is 90 ℃ and the pressure is 0.7 MPa) and then enters the next working procedure. The gram weight of the flash-spun fiber layer at the upper layer is 20g/m 2 The gram weight of the composite fiber web with the three-layer structure is 60g/m 2 。
The grey cloth after the pre-hot pressing enters a hot air type tentering setting machine, the temperature of the setting machine is set to be 124 ℃, the speed of the vehicle is 25m/min, and the grey cloth after the setting enters a hot calendering process. The surface temperature of the roller is 131 ℃, and the pressure is 3.5MPa. Thus obtaining the required non-woven composite sheet.
Examples 2-3, as shown in Table 1, except that the grammage of the core layer was changed to 10g/m 2 、5g/m 2 Otherwise, the procedure was as in example 1.
Example 4, as shown in table 1, except that the grammage of the first skin layer and the second skin layer was changed to 30g/m 2 The same procedure as in example 1 was repeated except that the surface temperature of the rolls was 132 ℃ and the pressure was 4.0 MPa.
Examples 5 to 6. As shown in Table 1, the grammage of the core layer was changed to 10g/m 2 、5g/m 2 The rest was the same as in example 4.
Comparative example 1:
the same HDPE pellets as in example 1 were selected, and 15% by mass of the HDPE pellets and 85% by mass of a solvent (a mixture of 15% difluoromethane (R22) and 85% tetrafluorodichloroethane (R114)) were added to the autoclave at the same time, and the temperature was increased to 180 ℃. After the temperature rise is finished, introducing nitrogen gas, pressurizing to 12MPa, simultaneously raising the temperature to 230 ℃, and stirring for 2 hours at the stirring speed of 100r/min. After the temperature is stable, a uniform spinning solution is formed in the high-pressure reaction kettle. The uniform solution is sprayed out through a spinneret orifice of a spray head to form a fiber bundle containing a plurality of superfine fibers, the fiber bundle is refracted and dispersed into a fiber mesh sheet in a mesh sheet-shaped structure through a rotary filament separating plate, the continuously formed fiber mesh sheet is laid on a movable net curtain to form a fiber mesh, and the gram weight of the fiber mesh sheet is 60g/m 2 . The fiber net enters a hot calendering process after cold pressing, and then is heatedThe surface temperature of the hot roll for calendering was 132 ℃ and the pressure was 4.5MPa.
Comparative example 2: as shown in Table 1, the formulation was the same as in comparative example 1, and the web grammage was also 60g/m 2 . The surface temperature of the hot roll for hot calendering was 129 ℃ and the pressure 4.5MPa.
Comparative example 3: as shown in table 1. The formulation is the same as comparative example 1, the grammage of the web is also 60g/m 2 . The surface temperature of the hot roller for hot calendering was 135 ℃ and the pressure 4.5MPa.
Comparative example 4: as shown in Table 1, the formulation was the same as in comparative example 1, and the web gram was 70g/m 2 . The hot-calendered surface temperature of the hot roller was 133 ℃ and the pressure was 4.5MPa.
Comparative example 5: as shown in Table 1, the formulation was the same as in comparative example 1, and the web gram was 70g/m 2 . The surface temperature of the hot roll for hot calendering was 130 ℃ and the pressure was 4.5MPa.
Comparative example 6: as shown in Table 1, the formulation was the same as in comparative example 1, and the web gram was 70g/m 2 . The surface temperature of the hot roll for hot calendering was 136 ℃ and the pressure was 4.5MPa.
TABLE 1 examples and comparative example formulations and procedures
The performance of each example and each comparative example was measured, and the specific items and results are shown in table 2.
TABLE 2 Performance test
As can be seen from the data of table 2, the conventional flash-spun sheets of comparative examples 1 to 6 increased in peel strength and stiffness with increasing hot-calendering temperature, but decreased in air permeability and tear strength. When the hot calendering temperature of a general flash-spun sheet is lowered, the air permeability and tear strength are improved, but the peel strength and stiffness are lowered.
In contrast, the non-woven composite sheets provided in examples 1 to 6 of the present application incorporate low-melting spunbond fibers in the core layer, so that the tear strength of the non-woven composite sheets is not reduced while the peel strength and stiffness of the non-woven composite sheets are still maintained at high levels.
And it can be seen from examples 1-6 that when the core layer spunbond fibers are too little, the spunbond fibers do not function and the performance of the nonwoven composite sheet is not significantly improved. However, when the number of the spun-bonded fibers in the core layer is too large, the spun-bonded fibers are easy to form an airtight film after being melted, which is not favorable for the air permeability of the nonwoven composite sheet. Meanwhile, it can be found that the grammage ratio of the core layers of the embodiment 1 and the embodiment 6 actually exceeds the core layer ratio range of the application, so that the overall performance of the composite material is not obviously improved.
In conclusion, compared with the prior art, the core layer spunbond fibers are used as the framework of the non-woven composite sheet provided by the application, so that the tensile breaking strength and tearing strength of the non-woven composite sheet are obviously improved on the premise of not influencing the service performance of the material, and meanwhile, the stiffness of the non-woven composite sheet is improved. In addition, the core layer spun-bonded fiber is low-melting-point fiber, and after the spun-bonded fiber is fused and cohered, the form of the flash-spun fiber is not obviously changed, so that the stripping strength of the non-woven composite sheet is also obviously improved, and the non-woven composite sheet has high air permeability.
In addition, it should be appreciated by those skilled in the art that although a number of problems exist in the prior art, each embodiment or solution of the present application can be improved in one or more aspects without necessarily solving all the technical problems listed in the prior art or in the background. It will be understood by those skilled in the art that nothing in a claim should be taken as a limitation on that claim.
Although terms such as first skin layer, second skin layer, core layer, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present application. They are to be construed in a manner that is inconsistent with the spirit of this application. The terms "first," "second," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: it is also possible to modify the solutions described in the previous embodiments or to substitute some or all of them with equivalents. And the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A nonwoven composite sheet characterized by: comprises that
A first surface layer, a core layer and a second surface layer;
the first surface layer and the second surface layer are made of flash spun fibers; the core layer is made of spunbond fibers;
the ratio of the gram weight of the core layer in the total gram weight is more than or equal to 10% and less than or equal to 30%.
2. The nonwoven composite sheet of claim 1, wherein: the flash spun fiber raw material adopts high-density polyethylene, and the melting point of the high-density polyethylene is more than or equal to 130 ℃ and less than or equal to 135 ℃; the spun-bonded fiber raw material adopts low-density polyethylene, and the melting point of the low-density polyethylene is greater than or equal to 100 ℃ and less than or equal to 110 ℃.
3. The nonwoven composite sheet of claim 1 further comprising any one or more of the following properties:
first, the total gram weight is 40g/m or more 2 And 120g/m or less 2 ；
Secondly, the gram weight of the core layer accounts for more than or equal to 11% and less than or equal to 20% of the total gram weight;
thirdly, the ratio of the grammage of the first surface layer to the grammage of the second surface layer in the total grammage is respectively more than or equal to 10% and less than or equal to 80%;
fourthly, the ratio difference of the gram weights of the first surface layer and the second surface layer in the total gram weight is not more than 15%;
fifthly, the stiffness is more than or equal to 20mN.cm and less than or equal to 45mN.cm;
sixthly, the air permeability is more than or equal to 18mm/s and less than or equal to 40mm/s.
4. A method for preparing a non-woven composite sheet is characterized by comprising the following steps:
flash-spinning the flash-spun fiber raw material to prepare a fiber mesh sheet, wherein the fiber mesh sheet forms a fiber mesh on a mesh curtain;
carrying out cold pressing on the fiber web, and condensing molten spun-bonded fibers on the cold-pressed fiber web to obtain a two-layer composite fiber web;
cold pressing the two-layer composite fiber net, and laying the fiber mesh sheet made of the flash spun fibers on the surface of the spun-bonded fibers of the cold-pressed two-layer composite fiber net to obtain a three-layer composite fiber net;
and (3) pre-hot pressing the three-layer composite fiber web, and then shaping by hot air and hot calendering to obtain the non-woven composite sheet.
5. The method of claim 4, wherein: the hot air setting temperature is higher than the melting point of the spun-bonded fiber and lower than the melting point of the flash spun fiber.
6. The method of claim 4, wherein: the preparation process of the fiber web comprises the following steps: mixing high-density polyethylene and a solvent in a reaction kettle, dissolving to form a uniform solution, spraying the uniform solution through a spinneret orifice of a spray head to form a fiber bundle containing superfine fibers, refracting and dispersing the fiber bundle into fiber meshes in a mesh-shaped structure through a rotary filament dividing plate, and continuously forming the fiber meshes to be laid on a movable screen to form the fiber mesh with a certain gram weight and width.
7. The method of manufacturing according to claim 4, characterized in that: the preparation process of the two-layer composite fiber web comprises the following steps: adding low-density polyethylene into a screw extruder, heating and melting the low-density polyethylene through the screw extruder, quantitatively metering the low-density polyethylene by a metering pump, extruding the low-density polyethylene through a die head to form a spinning stream, drafting the spinning stream into spun-bonded fibers under the action of wind force, and condensing the spun-bonded fibers on the flash-spun fiber web conveyed from the previous process to form the two-layer composite fiber web.
8. The method of claim 4, wherein: the preparation process of the three-layer composite fiber web comprises the following steps: mixing the fiber with high-density polyethylene and a solvent in a reaction kettle, dissolving the mixture to form a uniform solution, spraying the uniform solution through a spinneret orifice of a spray head to form a fiber bundle containing superfine fibers, refracting and dispersing the fiber bundle into fiber meshes in a mesh-shaped structure through a rotary filament separating plate, continuously forming the fiber meshes, overlaying the two layers of composite fiber nets transmitted in the previous process, overlaying a layer of flash spun fibers on the surface of the spun-bonded fibers of a core layer, and thus obtaining the three-layer composite fiber net.
9. The method of claim 4, wherein: the surface temperature of the hot-rolled and polished roller is more than or equal to 120 ℃ and less than or equal to 150 ℃, the oil pressure of the roller is 1.5-5.0 MPa, and the surface speed of the roller is 20-60 m/min.
10. The method of claim 4, wherein: the diameter of the spun-bonded fiber is more than or equal to 15 μm and less than or equal to 25 μm, and the diameter of the flash spun fiber is more than or equal to 0.5 μm and less than or equal to 2 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211556247.2A CN115852592A (en) | 2022-12-06 | 2022-12-06 | Nonwoven composite sheet and method of making same |
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| CN202211556247.2A CN115852592A (en) | 2022-12-06 | 2022-12-06 | Nonwoven composite sheet and method of making same |
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| CN115852592A true CN115852592A (en) | 2023-03-28 |
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| CN202211556247.2A Pending CN115852592A (en) | 2022-12-06 | 2022-12-06 | Nonwoven composite sheet and method of making same |
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| CN (1) | CN115852592A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117584574A (en) * | 2024-01-18 | 2024-02-23 | 山东希瑞新材料有限公司 | Nonwoven composite material and preparation method, device and application thereof |
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| CN117584574A (en) * | 2024-01-18 | 2024-02-23 | 山东希瑞新材料有限公司 | Nonwoven composite material and preparation method, device and application thereof |
| CN117584574B (en) * | 2024-01-18 | 2024-03-29 | 山东希瑞新材料有限公司 | Nonwoven composite material and preparation method, device and application thereof |
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