CN219133499U - Special multilayer film of biodegradable express delivery bag - Google Patents
Special multilayer film of biodegradable express delivery bag Download PDFInfo
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- CN219133499U CN219133499U CN202223439331.4U CN202223439331U CN219133499U CN 219133499 U CN219133499 U CN 219133499U CN 202223439331 U CN202223439331 U CN 202223439331U CN 219133499 U CN219133499 U CN 219133499U
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Abstract
The utility model relates to a special multilayer film for a biodegradable express bag, which comprises a printing layer, a first bonding layer, a reinforcing layer, a second bonding layer, a buffer layer, a third bonding layer and a covering layer which are sequentially laminated from top to bottom; the printing layer consists of a transparent tackifying layer and a toughening printing layer, and the toughening printing layer is arranged between the transparent tackifying layer and the first bonding layer; the transparent tackifying layer is a PLA layer, and the toughening printing layer is a PBAT layer. The special multilayer film for the biodegradable express bag has the advantages that the stiffness of the express bag is improved by forming the double-layer structure printing layer by the transparent tackifying layer and the toughening printing layer while maintaining excellent biodegradability; meanwhile, a buffer layer is arranged between the enhancement layer and the covering layer, so that energy penetrating through the enhancement layer in the process of acting external force is fully absorbed, and a good protection effect is achieved.
Description
Technical Field
The utility model relates to the field of packaging supplies, in particular to a special multilayer film for a biodegradable express bag.
Background
At present, along with the growth of living demands, especially the increase of online shopping demands, the use amount of express packaging bags is also increasing. However, although the conventional plastic express packaging bag is exquisite in appearance and excellent in use performance, the plastic express packaging bag cannot be biodegraded, and a large amount of waste express packaging bags become an extremely important source for environmental pollution nowadays, and serious pollution can be caused both by conventional landfill treatment and direct incineration treatment. Therefore, the use of conventional plastics in the field of express packaging bags has great environmental pollution drawbacks and disadvantages.
In order to solve the pollution problem of the abandoned express packaging bag, biodegradable plastic is developed, for example, the prior patent discloses a degradable environment-friendly plastic bag, the degradable environment-friendly plastic bag contains 15-16% of cetylstearyl glucoside modified biodegradation agent, after the structural characteristics of polyethylene resin are analyzed, the connecting structure between polyethylene resin molecules and other components can be obviously improved by adding a certain amount of cetylstearyl glucoside modified biodegradation agent, so that the melt processability of a material system can be improved to a certain extent, the physical and mechanical properties of the manufactured plastic bag can be improved, and the degradable plastic bag also has good degradability and high degradation speed.
As another example, the prior art discloses a fully biodegradable environment-friendly express bag and a preparation method thereof, the environment-friendly express bag is formed by compounding three layers of films, a printing layer with bacteriostasis, water resistance and low ink stripping degree is sequentially arranged from outside to inside, a shading layer with low light transmittance and a reinforcing layer with high tensile strength and high puncture resistance are sequentially arranged, although the environment-friendly express bag has better degradation performance, the stiffness and the buffer protection are still to be further improved, especially the stiffness has important influence on the performance of the express packaging bag, and when the stiffness is lower, the express can generate deformation distortion and other problems affecting the bagging efficiency in the filling process (especially on-line rapid filling); in addition, the high stiffness can also enhance the protection effect on express contents.
Disclosure of Invention
The utility model aims to solve the problems of poor stiffness and buffer protection performance of the existing biodegradable environment-friendly express bag, and provides a special multilayer film for the biodegradable express bag, wherein a single-layer printed layer structure of the traditional express bag is changed into a double-layer structure formed by a transparent tackifying layer and a toughening printed layer while maintaining excellent biodegradability, so that the handfeel toughness of the express bag is improved; by arranging the reinforcing layer, the strength and the stiffness of the multilayer film of the express bag can be enhanced; meanwhile, a buffer layer is arranged between the enhancement layer and the covering layer, so that energy penetrating through the enhancement layer in the process of acting external force is fully absorbed, and a good protection effect is achieved.
The above object of the present utility model is achieved by the following technical solutions:
a special multilayer film for a biodegradable express bag comprises a printing layer, a first bonding layer, a reinforcing layer, a second bonding layer, a buffer layer, a third bonding layer and a covering layer which are sequentially laminated from top to bottom;
the printing layer consists of a transparent tackifying layer and a toughening printing layer, and the toughening printing layer is arranged between the transparent tackifying layer and the first bonding layer;
the transparent tackifying layer is a PLA (polylactic acid) composite material layer, and the toughening printing layer is a PBAT (polybutylene terephthalate-co-adipate) layer.
The special multilayer film for the biodegradable express bag takes a polylactic acid (PLA) layer as a transparent tackifying layer, covers the surface of a PBAT toughening printing layer, and places the polylactic acid transparent tackifying layer on the uppermost layer on the basis of keeping the performance of the printing layer; due to the specific molecular structure and crystallinity of the polylactic acid, the polylactic acid has higher transparency and stiffness, and the transparent tackifying layer can improve the stiffness of the express bag and can also improve the surface glossiness and the surface smoothness; the PBAT toughening printing layer adopts water-based environment-friendly ink for surface printing, the printing surface is downward, and due to the molecular chain flexibility of the PBAT, the PBAT has quite excellent flexibility and higher surface wetting tension after film formation, the PBAT toughening printing layer adopts PBAT material, so that the layer has a toughening effect and also provides good printing effect and printing adhesive force, and the printing layer formed by combining the transparent tackifying layer and the toughening printing layer can fully and organically combine the stiffness of PLA with the flexibility of the PBAT, so that the PLA has good stiffness and toughness; the enhancement layer plays a role in enhancing the integral structure of the special multilayer film for the biodegradable express bag so as to improve the integral strength of the express bag; the buffer layer is arranged between the enhancement layer and the covering layer, and can fully absorb the energy passing through the enhancement layer when the buffer layer is acted by external force, so that the articles in the express bag are protected; the covering layer has lower light transmittance, so that the privacy of consumers can be protected; the first bonding layer, the second bonding layer and the third bonding layer arranged among the printing layer, the reinforcing layer, the buffer layer and the covering layer not only play a role in bonding all layers, but also play a role in enhancing the overall mechanical property of the special multilayer film for the biodegradable express bag. In addition, both PBAT and PLA are available commercially.
Namely, the special multilayer film for the biodegradable express bag not only has good biodegradability, but also has good stiffness and buffering protection effect, and can effectively reduce damage to articles caused by collision in the express transportation process.
Preferably, the reinforcing layer is a biaxially oriented polylactic acid film, which is commercially available.
Preferably, the buffer layer is a polylactic acid foam sheet layer, which can be obtained by commercial products.
Compared with other foaming materials, the polylactic acid foaming sheet has high impact resistance and can be completely degraded, and the whole biodegradable effect of the special multilayer film for the biodegradable express bag is not influenced while the buffer protection effect is realized.
Preferably, the meter gram weight of the buffer layer is 10-25 g/m 2 The thickness of the buffer layer is 40-100 μm.
Preferably, the covering layer is a black PBAT layer, and can be obtained through commercial products, and the black PBAT layer can cover the contents of the express bag, so that the privacy and confidentiality effects are achieved.
Preferably, the first adhesive layer is an aqueous polyurethane resin layer, an aqueous acrylic resin layer or an aqueous silicic acid gel resin layer.
Preferably, the second adhesive layer is an aqueous polyurethane resin layer, an aqueous acrylic resin layer or an aqueous silicic acid gel resin layer.
Preferably, the third adhesive layer is an aqueous polyurethane resin layer, an aqueous acrylic resin layer or an aqueous silicic acid gel resin layer.
The three-layer adhesive layers are all aqueous adhesives, so that the printing layer, the reinforcing layer, the buffer layer and the covering layer have good adhesive strength, the degradation performance of the express bag is not affected, and the three-layer adhesive layers are environment-friendly, nontoxic, pollution-free and harmful residues.
Preferably, the thickness of the printing layer and the reinforcing layer is 5-25 μm, and the thickness of the toughening printing layer is 2.5-20 μm.
Preferably, the thickness of the first adhesive layer, the second adhesive layer and the third adhesive layer is 0.5-4 μm.
Preferably, the thickness of the cover layer is 5 to 15 μm. More preferably, the light transmittance of the cover layer is < 50%.
Compared with the prior art, the utility model has the beneficial effects that:
the biodegradable multilayer film special for the express bag is formed by taking the PLA layer as the transparent tackifying layer and the PBAT layer as the toughening printing layer, has the strength of PLA and the toughness of PBAT on the basis of keeping the performance of the printing layer, and can improve the hand feeling toughness of the express bag and the surface smoothness at the same time; the enhancement layer plays a role in enhancing the integral structure of the special multilayer film for the biodegradable express bag so as to improve the integral strength and stiffness of the express bag; the buffer layer is arranged between the enhancement layer and the covering layer, and can fully absorb the energy passing through the enhancement layer when the buffer layer is acted by external force, so that the articles in the express bag are protected; the covering layer has lower light transmittance, so that the privacy of consumers can be protected; the first bonding layer, the second bonding layer and the third bonding layer arranged among the printing layer, the reinforcing layer, the buffer layer and the covering layer not only play a role in bonding all layers, but also play a role in enhancing the overall mechanical property of the special multilayer film for the biodegradable express bag.
Drawings
Fig. 1 is a schematic cross-sectional structure of a multilayer film special for a biodegradable express bag, wherein 1 is a printing layer, 2 is a first adhesive layer, 3 is a reinforcing layer, 4 is a second adhesive layer, 5 is a buffer layer, 6 is a third adhesive layer, and 7 is a covering layer.
Detailed Description
The present utility model will be described in further detail with reference to the following specific examples for the purpose of illustration and not limitation, and various modifications may be made within the scope of the present utility model as defined by the appended claims.
Example 1
The embodiment provides a special multilayer film for a biodegradable express bag, and fig. 1 is a schematic cross-sectional structure diagram of the special multilayer film for the biodegradable express bag. As shown in fig. 1, the special multilayer film for the biodegradable express bag comprises a printing layer 1, a first bonding layer 2, a reinforcing layer 3, a second bonding layer 4, a buffer layer 5, a third bonding layer 6 and a covering layer 7 which are sequentially laminated from top to bottom;
the printing layer 1 consists of a transparent tackifying layer 11 and a toughening printing layer 12;
the transparent tackifying layer 11 is a PLA layer, and the toughening printing layer 12 is a PBAT layer;
wherein the thickness of the printing layer 1 is 25 mu m, the thickness of the transparent tackifying layer 11 is 5 mu m, and the thickness of the toughening printing layer 12 is 20 mu m;
the first adhesive layer 2, the second adhesive layer 4 and the third adhesive layer 6 are all aqueous polyurethane resin layers with the thickness of 1 μm;
the reinforcing layer 3 is a biaxially oriented polylactic acid film, and the thickness of the reinforcing layer is 15 mu m;
the buffer layer 5 is a polylactic acid foaming sheet layer with the meter gram weight of 25g/m 2 The thickness is 100 μm;
the cover layer 7 is a black PBAT layer having a thickness of 15 μm and a light transmittance of 30%.
Example 2
The embodiment provides a special multilayer film for a biodegradable express bag, which comprises a printing layer 1, a first bonding layer 2, a reinforcing layer 3, a second bonding layer 4, a buffer layer 5, a third bonding layer 6 and a covering layer 7 which are sequentially laminated from top to bottom;
the printing layer 1 consists of a transparent tackifying layer 11 and a toughening printing layer 12;
the transparent tackifying layer 11 is a PLA layer, and the toughening printing layer 12 is a PBAT layer;
wherein the thickness of the printing layer 1 is 15 mu m, the thickness of the transparent tackifying layer 11 is 3 mu m, and the thickness of the toughening printing layer 12 is 12 mu m;
the first adhesive layer 2, the second adhesive layer 4 and the third adhesive layer 6 are all aqueous silicic acid gel resin layers with the thickness of 0.5 μm;
the reinforcing layer 3 is a biaxially oriented polylactic acid film, and the thickness of the reinforcing layer is 12 mu m;
the buffer layer 5 is a polylactic acid foaming sheet layer with 15g/m of meter gram weight 2 Thickness is 60 μm;
the cover layer 7 is a black PBAT layer having a thickness of 12 μm and a light transmittance of 35%.
Example 3
The embodiment provides a special multilayer film for a biodegradable express bag, which comprises a printing layer 1, a first bonding layer 2, a reinforcing layer 3, a second bonding layer 4, a buffer layer 5, a third bonding layer 6 and a covering layer 7 which are sequentially laminated from top to bottom;
the printing layer 1 consists of a transparent tackifying layer 11 and a toughening printing layer 12;
the transparent tackifying layer 11 is a PLA layer, and the toughening printing layer 12 is a PBAT layer;
wherein the thickness of the printing layer 1 is 5 mu m, the thickness of the transparent tackifying layer 11 is 2.5 mu m, and the thickness of the toughening printing layer 12 is 2.5 mu m;
the first adhesive layer 2, the second adhesive layer 4 and the third adhesive layer 6 are all aqueous acrylic resin layers having a thickness of 4 μm;
the reinforcing layer 3 is a biaxially oriented polylactic acid film, and the thickness of the biaxially oriented polylactic acid film is 25 mu m;
the buffer layer 5 is a polylactic acid foaming sheet layer with the meter gram weight of 25g/m 2 The thickness is 100 μm;
the cover layer 7 is a black PBAT layer having a thickness of 5 μm and a light transmittance of 45%.
Example 4
The embodiment provides a special multilayer film for a biodegradable express bag, which comprises a printing layer 1, a first bonding layer 2, a reinforcing layer 3, a second bonding layer 4, a buffer layer 5, a third bonding layer 6 and a covering layer 7 which are sequentially laminated from top to bottom;
the printing layer 1 consists of a transparent tackifying layer 11 and a toughening printing layer 12;
the transparent tackifying layer 11 is a PLA layer, and the toughening printing layer 12 is a PBAT layer;
wherein the thickness of the printing layer 1 is 25 mu m, the thickness of the transparent tackifying layer 11 is 5 mu m, and the thickness of the toughening printing layer 12 is 20 mu m;
the first adhesive layer 2, the second adhesive layer 4 and the third adhesive layer 6 are all aqueous polyurethane resin layers with the thickness of 2 mu m;
the reinforcing layer 3 is a biaxially oriented polylactic acid film, and the thickness of the reinforcing layer is 5 mu m;
the buffer layer 5 is a polylactic acid foaming sheet layer with the meter gram weight of 25g/m 2 The thickness is 100 μm;
the cover layer 7 is a black PBAT layer having a thickness of 15 μm and a light transmittance of 30%.
Example 5
The embodiment provides a special multilayer film for a biodegradable express bag, which comprises a printing layer 1, a first bonding layer 2, a reinforcing layer 3, a second bonding layer 4, a buffer layer 5, a third bonding layer 6 and a covering layer 7 which are sequentially laminated from top to bottom;
the printing layer 1 consists of a transparent tackifying layer 11 and a toughening printing layer 12;
the transparent tackifying layer 11 is a PLA layer, and the toughening printing layer 12 is a PBAT layer;
wherein the thickness of the printing layer 1 is 10 mu m, the thickness of the transparent tackifying layer 11 is 4 mu m, and the thickness of the toughening printing layer 12 is 6 mu m;
the first adhesive layer 2, the second adhesive layer 4 and the third adhesive layer 6 are all aqueous acrylic resin layers having a thickness of 3 μm;
the reinforcing layer 3 is a biaxially oriented polylactic acid film, and the thickness of the reinforcing layer is 20 mu m;
the buffer layer 5 is polylactic acidFoamed sheet layer having a Michael weight of 25g/m 2 The thickness is 90 μm;
the cover layer 7 is a black PBAT layer having a thickness of 5 μm and a light transmittance of 45%.
Example 6
The embodiment provides a special multilayer film for a biodegradable express bag, which comprises a printing layer 1, a first bonding layer 2, a reinforcing layer 3, a second bonding layer 4, a buffer layer 5, a third bonding layer 6 and a covering layer 7 which are sequentially laminated from top to bottom;
the printing layer 1 consists of a transparent tackifying layer 11 and a toughening printing layer 12;
the transparent tackifying layer 11 is a PLA layer, and the toughening printing layer 12 is a PBAT layer;
wherein the thickness of the printing layer 1 is 15 mu m, the thickness of the transparent tackifying layer 11 is 5 mu m, and the thickness of the toughening printing layer 12 is 10 mu m;
the first adhesive layer 2, the second adhesive layer 4 and the third adhesive layer 6 are all aqueous polyurethane resin layers with the thickness of 2 mu m;
the reinforcing layer 3 is a biaxially oriented polylactic acid film, and the thickness of the reinforcing layer is 5 mu m;
the buffer layer 5 is a polylactic acid foaming sheet layer with the meter gram weight of 25g/m 2 The thickness is 100 μm;
the cover layer 7 is a black PBAT layer having a thickness of 15 μm and a light transmittance of 30%.
Example 7
The embodiment provides a special multilayer film for a biodegradable express bag, which comprises a printing layer 1, a first bonding layer 2, a reinforcing layer 3, a second bonding layer 4, a buffer layer 5, a third bonding layer 6 and a covering layer 7 which are sequentially laminated from top to bottom;
the printing layer 1 consists of a transparent tackifying layer 11 and a toughening printing layer 12;
the transparent tackifying layer 11 is a PLA layer, and the toughening printing layer 12 is a PBAT layer;
wherein the thickness of the printing layer 1 is 15 mu m, the thickness of the transparent tackifying layer 11 is 3 mu m, and the thickness of the toughening printing layer 12 is 12 mu m;
the first adhesive layer 2 and the second adhesive layer 4 are both aqueous silicic acid gel resin layers, and the thickness thereof is 0.5 μm; the third adhesive layer 6 is an aqueous acrylic resin layer having a thickness of 0.5 μm;
the reinforcing layer 3 is a biaxially oriented polylactic acid film, and the thickness of the reinforcing layer is 12 mu m;
the buffer layer 5 is a polylactic acid foaming sheet layer with 15g/m of meter gram weight 2 Thickness is 60 μm;
the cover layer 7 is a black PBAT layer having a thickness of 12 μm and a light transmittance of 35%.
According to the biodegradable multilayer film special for the express bags, the thickness of the toughening printing layer and the reinforcing layer in the printing layer has obvious influence on the whole toughness and stiffness of the multilayer film of the express bags. When the thickness of the toughened printing layer is 2.5-20 mu m, the multilayer film has better toughness and stiffness. In addition, the gram weight (thickness) of the buffer layer directly influences the compression-resistant buffer capacity of the express bag; the light transmittance of the multilayer film is about 45% when the thickness of the covering layer is 5 μm, and about 30% when the thickness of the covering layer is 15 μm.
Examples 1 to 7 show that the multilayer film special for the biodegradable express bag of the utility model increases the toughness and stiffness of the express bag by forming a double-layer structure printing layer by a transparent tackifying layer and a toughening printing layer while maintaining excellent biodegradability; meanwhile, a buffer layer is arranged between the enhancement layer and the covering layer, so that energy penetrating through the enhancement layer in the process of acting external force is fully absorbed, and a good protection effect is achieved.
It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. The special multilayer film for the biodegradable express bag is characterized by comprising a printing layer (1), a first bonding layer (2), a reinforcing layer (3), a second bonding layer (4), a buffer layer (5), a third bonding layer (6) and a covering layer (7) which are sequentially laminated from top to bottom;
the printing layer (1) consists of a transparent tackifying layer (11) and a toughening printing layer (12), and the toughening printing layer (12) is arranged between the transparent tackifying layer (11) and the first bonding layer (2);
the transparent tackifying layer (11) is a PLA layer, and the toughening printing layer (12) is a PBAT layer.
2. The multilayer film special for the biodegradable express delivery bag according to claim 1, wherein the reinforcing layer (3) is a biaxially oriented polylactic acid film.
3. The multilayer film special for biodegradable express bags according to claim 1, characterized in that the buffer layer (5) is a polylactic acid foaming sheet layer.
4. The multilayer film special for biodegradable express bags according to claim 1, characterized in that said cover layer (7) is a black PBAT layer.
5. The multilayer film special for biodegradable express bags according to claim 1, characterized in that said first adhesive layer (2) is an aqueous polyurethane resin layer, an aqueous acrylic resin layer or an aqueous silicic acid gel resin layer.
6. The multilayer film special for biodegradable express bags according to claim 5, characterized in that said second adhesive layer (4) is an aqueous polyurethane resin layer, an aqueous acrylic resin layer or an aqueous silicic acid gel resin layer.
7. The multilayer film special for biodegradable express bags according to claim 6, characterized in that said third adhesive layer (6) is an aqueous polyurethane resin layer, an aqueous acrylic resin layer or an aqueous silicic acid gel resin layer.
8. The multilayer film special for biodegradable express bags according to any one of claims 1 to 7, characterized in that the thickness of the printing layer (1) and the reinforcing layer (3) is 5 to 25 μm, and the thickness of the toughening printing layer (12) is 2.5 to 20 μm.
9. The multilayer film for biodegradable express bags according to any one of claims 1 to 7, characterized in that said first adhesive layer (2), second adhesive layer (4) and third adhesive layer (6) have a thickness of 0.5 to 4 μm.
10. The multilayer film dedicated for biodegradable express bags according to any one of claims 1 to 7, characterized in that said covering layer (7) has a thickness of 5 to 15 μm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116919704A (en) * | 2023-09-18 | 2023-10-24 | 山东旭喜新材料科技有限公司 | Environment-friendly artificial fistula bag convenient to firmly connect and preparation method thereof |
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2022
- 2022-12-21 CN CN202223439331.4U patent/CN219133499U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116919704A (en) * | 2023-09-18 | 2023-10-24 | 山东旭喜新材料科技有限公司 | Environment-friendly artificial fistula bag convenient to firmly connect and preparation method thereof |
| CN116919704B (en) * | 2023-09-18 | 2023-12-12 | 山东旭喜新材料科技有限公司 | Environment-friendly artificial fistula bag convenient to firmly connect and preparation method thereof |
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