CN215273944U - Ventilative leak protection complex film - Google Patents
Ventilative leak protection complex film Download PDFInfo
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- CN215273944U CN215273944U CN202121838774.3U CN202121838774U CN215273944U CN 215273944 U CN215273944 U CN 215273944U CN 202121838774 U CN202121838774 U CN 202121838774U CN 215273944 U CN215273944 U CN 215273944U
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Abstract
The application relates to the technical field of films, in particular to a breathable and leak-proof composite film which comprises a surface layer, an absorption layer, a breathable layer and a non-woven fabric layer which are arranged in sequence, wherein the surface layer is a composite film with the water vapor transmission rate of more than 1500g/m224H, hydrostatic pressure resistance greater than 30cm/H2The air-permeable layer is a PE (polyethylene) air-permeable film layer with water vapor transmission rate of more than 1000g/m224H, hydrostatic pressure resistance greater than 50cm/H2And the surface layer and the breathable layer are internally provided with a plurality of calcium carbonate particles in advance, and the absorption layer is used for absorbing leakage caused by the damage of the surface layer. The breathable and leak-proof composite film has the advantages of being good in breathability and leak resistance.
Description
Technical Field
The application relates to the field of film technology, in particular to a breathable and leak-proof composite film.
Background
The plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, is used for packaging and is used as a film coating layer, and is widely applied to the fields of food, medicine, chemical industry and the like.
In practical application, a single-layer plastic film structure is difficult to adapt to different application scenes, and a composite film is often formed by compounding multiple layers of films. Compared with a single-layer film, the composite film has the advantages of high tensile strength, high elongation at break and the like, and can be additionally provided with various functional film layers such as a water absorption film and the like according to actual needs.
In some specific products, such as sanitary napkins, diapers and the like, the composite film is required to play a role of air permeability and leakage prevention, but the currently used composite film has poor air permeability and leakage prevention performance and can be improved.
SUMMERY OF THE UTILITY MODEL
In order to improve the air permeability and leak resistance of the composite film and meet the air permeability and leak resistance requirements of products such as sanitary towels, paper diapers and the like, the application provides the air permeability and leak resistance composite film.
The application provides a ventilative leak-proof complex film adopts following technical scheme:
the breathable and leak-proof composite film comprises a surface layer, an absorption layer, a breathable layer and a non-woven fabric layer which are sequentially arranged, wherein the surface layer is a composite film with the water vapor transmission rate of more than 1500g/m224H, hydrostatic pressure resistance greater than 30cm/H2The air-permeable layer is a PE (polyethylene) air-permeable film layer with water vapor transmission rate of more than 1000g/m224H, hydrostatic pressure resistance greater than 50cm/H2And the surface layer and the breathable layer are internally provided with a plurality of calcium carbonate particles in advance, and the absorption layer is used for absorbing leakage caused by the damage of the surface layer.
The absorption layer is an SAP absorbent paper layer.
The non-woven fabric layer is a non-woven fabric layer with natural soft touch.
Through adopting above-mentioned technical scheme, predetermine a plurality of randomly distributed's calcium carbonate granule in superficial layer and ventilative layer, when the PE ventilated membrane is tensile, because the calcium carbonate granule does not possess the ductility, consequently PE ventilated membrane attenuation when tensile, wherein can form certain space between predetermined calcium carbonate granule and the PE ventilated membrane, the size in this space can allow gas to pass through, and stop liquid outside, thereby the ventilative leak protection ability on superficial layer and ventilative layer has been improved, and then the holistic ventilative leak protection performance of complex film has been improved.
However, calcium carbonate particles partially located on the surface of the PE breathable film protrude from the surface of the PE breathable film, and the void size is further increased, which may cause the breathable film to break during stretching. This application has reduced because of the condition emergence that the space grow leads to the diaphragm body fracture through setting up non-woven fabrics layer.
In the use, when the superficial layer friction was damaged, the weeping phenomenon probably appeared, through setting up the absorbed layer, can absorb the weeping to reduce the liquid accumulation on ventilative layer surface, further improve the holistic leak protection performance of complex film.
Preferably, the surface layer and the air-permeable layer are both PE casting air-permeable film layers.
Preferably, the basis weight of the surface layer is 8-15gsm, and the basis weight of the breathable layer is 17-40 gsm.
By adopting the technical scheme, the basis weight represents the gram weight of the film layer in a unit area, and the higher the basis weight is, the thicker the film layer is. The superficial layer and ventilative layer basis weight that this application used are in above-mentioned within range, and thickness is moderate, and has relatively higher tensile strength and elongation at break, and ventilative leak protection performance is good, is favorable to improving the holistic ventilative leak protection performance of complex film, effectively reduces complex film thickness, improves the range of application of complex film.
Preferably, a plurality of micropores are preset in the surface layer and the breathable layer and on the surface of the surface layer and the breathable layer.
By adopting the technical scheme, the integral air permeability of the composite membrane is further improved, and the application range of the composite membrane is widened. When the air-permeable membrane is applied to products such as sanitary towels, paper diapers and the like, the air permeability of the sanitary towels and the paper diapers can be obviously improved.
Preferably, the size of the micropores is less than 0.02 μm.
Through adopting above-mentioned technical scheme, under the prerequisite of guaranteeing complex film air permeability, reduce microporous size, can further improve the leak protection impervious performance of ventilated membrane, improve the holistic leak protection nature of complex film.
Preferably, one side of the absorption layer, which is close to the surface layer, is recessed inwards to form a diversion trench, and the absorption layer is further provided with a through hole in a penetrating manner, and the through hole is communicated with the diversion trench.
Through adopting above-mentioned technical scheme, if when the superficial layer takes place the damage, liquid passes through surface layer laminar flow to the absorbing layer surface, gets into the guiding gutter, flows in the absorbing layer from the through-hole of guiding gutter bottom to by the absorbing layer effective absorption, the condition that reduces the weeping takes place.
Preferably, the diversion trench is V-shaped or U-shaped.
Preferably, the through hole is in an inverted cone shape.
Through adopting above-mentioned technical scheme, V type or U type guiding gutter can be smoothly with liquid leading-in through-hole in, improve the liquid velocity of flow and liquid flow, the back taper through-hole can significantly reduce the emergence of rewetting, can keep better liquid and gas through rate.
Preferably, an adhesive layer is further arranged between the breathable layer and the non-woven fabric layer, and the adhesive layer is a hot melt adhesive layer.
Through adopting above-mentioned technical scheme, will breathe freely the layer through hot melt adhesive layer and non-woven fabrics layer fixed connection, not only be convenient for produce, and little to the loss of complex film gas permeability.
Preferably, the adhesive layer comprises a hot melt adhesive strip and hot melt adhesive points, the hot melt adhesive strip is used for bonding the edge area of the breathable layer and the non-woven fabric layer, and the hot melt adhesive points are used for bonding the middle area of the breathable layer and the non-woven fabric layer.
Through adopting above-mentioned technical scheme, the border region uses hot melt adhesive bonding strip to bond, and the middle part region uses hot melt adhesive bond point to bond, has under the prerequisite of good bond strength between messenger's ventilative layer and the non-woven fabrics layer, reduces the use amount of hot melt adhesive, simultaneously, can further reduce the loss of complex film gas permeability.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the composite film prepared by the method has good air permeability and good leakage resistance, and can meet the air permeability and leakage resistance requirements of products such as sanitary towels, paper diapers and the like;
2. according to the air-permeable layer, the calcium carbonate particles are preset in the air-permeable layer, and the micropores are formed in the air-permeable layer and on the surface of the air-permeable layer, so that the air permeability of the air-permeable layer is improved, and meanwhile, as the sizes of gaps and micropores formed in the air-permeable layer are smaller, liquid cannot pass through the air-permeable layer, so that the air-permeable layer has better leakage-proof performance;
3. this application not only has reduced the quantity of hot melt adhesive through constitute the bond line by hot melt adhesive bonding strip and hot melt adhesive bond point, has still further reduced the loss of complex film gas permeability.
Drawings
FIG. 1 is a schematic cross-sectional view of a breathable, leak-proof composite membrane according to an embodiment of the present application;
FIG. 2 is a schematic structural view of a flow guide groove for highlighting the flow guide groove in the embodiment of the present application;
FIG. 3 is a schematic view of the structure of the adhesive layer in the embodiment of the present application for highlighting the adhesive layer.
Reference numerals: 1. a surface layer; 2. an absorbing layer; 3. a breathable layer; 4. a non-woven fabric layer; 5. calcium carbonate particles; 6. micropores; 7. a diversion trench; 8. a through hole; 9. an adhesive layer; 91. hot melt adhesive bonding strips; 92. and (4) hot melt adhesive bonding points.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a breathable and leak-proof composite film. Referring to fig. 1, the air-permeable and leak-proof composite membrane comprises a surface layer 1, an absorption layer 2, an air-permeable layer 3, an adhesive layer 9 and a non-woven fabric layer 4, wherein the surface layer 1 and the air-permeable layer 3 are respectively arranged on two sides of the absorption layer 2, the non-woven fabric layer 4 is arranged on one side of the air-permeable layer 3 far away from the absorption layer 2, and the non-woven fabric layer 4 is fixedly connected with the air-permeable layer 3 through the adhesive layer 9.
The surface layer 1 and the air permeable layer 3 are PE casting air permeable film layers and are prepared by taking low-density polyethylene as a raw material through a casting process. The surface layer 1 has a water vapor transmission rate of more than 1500g/m224H, hydrostatic pressure resistance greater than 30cm/H2O, basis weight of 8-15 gsm; the water vapor transmission rate of the air permeable layer 3 is more than 1000g/m224H, hydrostatic pressure resistance greater than 50cm/H2O, basis weight of 17-40 gsm.
Referring to fig. 1, a plurality of calcium carbonate particles 5 are also pre-arranged in the surface layer 1 and the air-permeable layer 3, and the calcium carbonate particles 5 are randomly distributed in the surface layer 1 and the air-permeable layer 3. In order to further improve the air permeability of the surface layer 1 and the air-permeable layer 3, a plurality of micropores 6 are preset in the surface layer 1 and the air-permeable layer 3, the micropores 6 are randomly distributed in the surface layer 1 and the air-permeable layer 3, and the size of the micropores 6 is less than 0.02 μm. Because the molecular size of water vapor is larger than 0.0004 μm and the molecular size of water drops is larger than 100 μm, the surface layer 1 and the breathable layer 3 have better breathable and leakproof performance.
The absorption layer 2 is an SAP absorbent paper layer, the water absorption multiplying power of the SAP absorbent paper layer can reach more than 100 times, the thickness is moderate, the bulkiness is good, the flexibility is better, and the surface is smoother after liquid absorption, so that the comfort level of the use of the composite layer is improved, and the basis weight is 120 +/-20 gsm. Referring to fig. 1 and 2, one side of the absorption layer 2 close to the surface layer 1 is inwards recessed to form a diversion trench 7, the absorption layer 2 is further penetrated and provided with a through hole 8, the through hole 8 is communicated with the diversion trench 7, and the through hole 8 is uniformly arranged in the diversion trench 7. In order to smoothly guide the liquid into the through hole 8, the cross section of the flow guide groove 7 may be V-shaped or U-shaped, and in the embodiment of the present application, the cross section of the flow guide groove 7 is V-shaped. Meanwhile, the through hole 8 is arranged to be in an inverted cone shape in the embodiment of the application, so that the back seepage of liquid is reduced.
The nonwoven fabric layer 4 is a natural soft touch nonwoven fabric layer made of spunlace nonwoven fabric.
The adhesive layer 9 is a hot melt adhesive layer and is formed by hot processing of a hot melt adhesive powder body. Referring to fig. 3, the adhesive layer 9 includes a hot melt adhesive strip 91 and hot melt adhesive dots 92, the hot melt adhesive strip 91 is disposed in the edge region of the contact surface between the air-permeable layer 3 and the nonwoven layer 4, the hot melt adhesive dots 92 are disposed in the middle region of the contact surface between the air-permeable layer 3 and the nonwoven layer 4, and the hot melt adhesive dots 92 are randomly distributed in the middle region. According to the arrangement, the consumption of the hot melt adhesive powder is reduced, and meanwhile, the loss of the air permeability of the composite film is reduced.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The breathable and leak-proof composite film is characterized by comprising a surface layer (1), an absorption layer (2), a breathable layer (3) and a non-woven fabric layer (4) which are sequentially arranged, wherein the surface layer (1) is a composite film with the water vapor transmission rate of more than 1500g/m224H, hydrostatic pressure resistance greater than 30cm/H2The air-permeable layer (3) is a PE air-permeable film layer with water vapor transmission rate more than 1000g/m224H, hydrostatic pressure resistance greater than 50cm/H2The surface layer (1) and the breathable layer (3) are internally provided with a plurality of calcium carbonate particles (5), and the absorption layer (2) is used for absorbing leakage caused by damage of the surface layer (1).
2. Air-permeable, leak-proof composite film according to claim 1, characterized in that said surface layer (1) and said air-permeable layer (3) are both cast PE air-permeable film layers.
3. Air-permeable, leak-proof composite film according to claim 1 or 2, characterised in that the basis weight of the surface layer (1) is 8-15gsm and the basis weight of the air-permeable layer (3) is 17-40 gsm.
4. The breathable and leakproof composite film according to claim 1 or 2, characterized in that the surface layer (1) and the breathable layer (3) are also internally and externally predisposed with a plurality of micropores (6).
5. The breathable, leak-proof composite film according to claim 4, characterized in that said micropores (6) have a size of less than 0.02 μm.
6. The air-permeable leakproof composite film according to claim 1, wherein the side of the absorption layer (2) close to the surface layer (1) is recessed inwards to form a diversion trench (7), the absorption layer (2) is further provided with a through hole (8) in a penetrating manner, and the through hole (8) is communicated with the diversion trench (7).
7. The air-permeable leak-proof composite film according to claim 6, wherein the flow guide grooves (7) are V-shaped or U-shaped.
8. Air-permeable leak-proof composite membrane according to claim 7, characterized in that said through holes (8) are of inverted cone shape.
9. The air-permeable leak-proof composite film according to claim 1, wherein an adhesive layer (9) is further arranged between the air-permeable layer (3) and the non-woven fabric layer (4), and the adhesive layer (9) is a hot melt adhesive layer.
10. Air permeable, leak proof composite film according to claim 9, characterized in that said adhesive layer (9) comprises hot melt adhesive strips (91) and hot melt adhesive dots (92), said hot melt adhesive strips (91) being intended to adhere the air permeable layer (3) to the border regions of the nonwoven layer (4), said hot melt adhesive dots (92) being intended to adhere the air permeable layer (3) to the central regions of the nonwoven layer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121838774.3U CN215273944U (en) | 2021-08-06 | 2021-08-06 | Ventilative leak protection complex film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121838774.3U CN215273944U (en) | 2021-08-06 | 2021-08-06 | Ventilative leak protection complex film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215273944U true CN215273944U (en) | 2021-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121838774.3U Active CN215273944U (en) | 2021-08-06 | 2021-08-06 | Ventilative leak protection complex film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215273944U (en) |
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2021
- 2021-08-06 CN CN202121838774.3U patent/CN215273944U/en active Active
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