Barrier composite sheet and packaging hose

Abstract

The utility model belongs to the technical field of regenerated packaging sheets, and particularly relates to a barrier composite sheet and a packaging hose. The barrier composite sheet provided by the utility model comprises a plurality of layers of thin film materials which are compounded together, wherein the barrier composite sheet comprises a co-extrusion surface layer, a first bonding layer, a co-extrusion middle layer, a second bonding layer and a co-extrusion inner layer from outside to inside; the co-extrusion surface layer is formed by co-extrusion compounding of multiple layers of polyolefin, at least one layer is a post-consumption regenerated polyolefin material layer, and the layer closest to the outer side is a primary polyolefin material layer; the co-extrusion middle layer is formed by co-extrusion compounding of multiple layers of polyolefin, and at least one layer is a post-consumption regenerated polyolefin material layer; the co-extrusion inner layer is formed by co-extrusion compounding of multiple layers of polyolefin, at least one layer is a post-consumption regenerated polyolefin material layer, and the layer closest to the inner side is a primary polyolefin material layer. The barrier composite sheet and the packaging hose product manufactured by the barrier composite sheet are environment-friendly, and have excellent comprehensive performance and wide applicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of recycled packaging sheets, and in particular relates to a barrier composite sheet and a packaging hose. Background Art

[0002] Recycled polyolefin materials, as an important resource recycling method, have experienced rapid development in recent years. They not only effectively reduce reliance on virgin fossil resources but also significantly reduce the environmental impact of waste disposal. However, recycled polyolefin materials, such as recycled polyethylene (PE) and recycled polypropylene (PP), often lack the physical and chemical properties and processing characteristics of virgin materials, which limits their widespread application in high-performance packaging.

[0003] Recycled polyolefins undergo multiple thermal processes and recycling, leading to molecular chain breakage, which in turn affects the material's tensile strength, impact strength, and elastic modulus. These reduced mechanical properties make the recycled material susceptible to deformation or damage when subjected to external forces, reducing the mechanical stability of the packaging material. Recycled polyolefins often contain more impurities, resulting in reduced transparency and gloss, which not only affects the barrier properties of the packaging material but also its appearance.

[0004] Especially in the field of high-end packaging that requires high barrier properties, good sealing and surface finish, how to significantly increase the proportion of recycled polyolefin materials used while ensuring the performance of packaging materials and realize a true circular economy is a technical problem that needs to be solved urgently. Utility Model Content

[0005] In view of the above problems existing in the prior art, the utility model provides a barrier composite sheet and a packaging hose.

[0006] The first aspect of the present invention is to provide a barrier composite sheet, comprising a coextruded surface layer, a first adhesive layer, a coextruded middle layer, a second adhesive layer and a coextruded inner layer arranged in sequence along a first direction; wherein the coextruded surface layer, the coextruded middle layer and the coextruded inner layer all include at least one layer of post-consumer recycled polyolefin material, and a layer on the coextruded surface layer and the coextruded inner layer away from the coextruded middle layer is a virgin polyolefin material layer.

[0007] As a further optimization solution for the above-mentioned barrier composite sheet, the co-extruded surface layer is formed by 2 to 9 layers of polyolefin co-extruded composite. Except for the layer away from the co-extruded middle layer, the remaining layers are all post-consumer recycled polyolefin material layers.

[0008] As a further optimization solution for the above-mentioned barrier composite sheet, the co-extruded inner layer is formed by 2 to 9 layers of polyolefin co-extruded composite. Except for the layer away from the co-extruded middle layer, the remaining layers are all post-consumer recycled polyolefin material layers.

[0009] As a further optimization solution for the above-mentioned barrier composite sheet, the co-extruded middle layer is composed of 2 to 9 layers of post-consumer recycled polyolefin material.

[0010] As a further optimization solution for the above barrier composite sheet, the first adhesive layer and the second adhesive layer are polyolefin layers.

[0011] As a further optimization solution for the above barrier composite sheet, the first adhesive layer and the second adhesive layer are selected from ethylene-acrylic acid copolymer or ethylene-methacrylic acid copolymer.

[0012] As a further optimization solution for the above-mentioned barrier composite sheet, the post-consumer recycled polyolefin material layer is a post-consumer recycled polyethylene material layer; and the virgin polyolefin material layer is a virgin polyethylene material layer.

[0013] As a further optimization solution for the above-mentioned barrier composite sheet, a polyurethane adhesive layer is further provided between the first adhesive layer and the co-extruded intermediate layer.

[0014] The second aspect of the present invention is to provide a packaging hose, comprising a flexible tube body, which is made of the above-mentioned barrier composite sheet.

[0015] As a further optimization solution for the above-mentioned packaging hose, the recycled polyolefin material contained in the barrier composite sheet accounts for 30%-90% of the total mass.

[0016] Beneficial effects

[0017] The utility model relates to an environmentally friendly barrier composite sheet and application thereof in the field of packaging. The product is not only environmentally friendly but also has excellent comprehensive performance and wide applicability.

[0018] The barrier composite sheet and packaging hose of the utility model use a large amount of post-consumer recycled polyolefin materials, which reduces the demand for new raw materials, lowers the consumption of fossil raw materials, alleviates the pressure on the environment, and embodies the concept of circular economy.

[0019] The barrier composite sheet and packaging hose of the present invention form a reliable barrier by combining polyolefin materials from different sources through multi-layer co-extrusion and bonding, effectively preventing gas and moisture penetration, and improving the barrier performance of the composite sheet.

[0020] The barrier composite sheet and packaging hose of the present invention use virgin polyolefin materials in the outermost and innermost layers to ensure good sealing performance and surface smoothness. At the same time, the inner layer uses a large amount of recycled materials to achieve a balance between performance and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the barrier composite sheet of Example 1.

[0022] Figure 2 This is a schematic structural diagram of the barrier composite sheet of Example 2.

[0023] Figure 3 This is a schematic structural diagram of the packaging hose of Example 3. DETAILED DESCRIPTION

[0024] The present invention is further illustrated below through examples, which are intended to more clearly illustrate the technical solution of the present invention and should not be construed as limiting the present invention.

[0025] Example 1

[0026] like Figure 1 The barrier composite sheet shown includes a coextruded surface layer 1, a first adhesive layer 2, a coextruded middle layer 3, a second adhesive layer 4 and a coextruded inner layer 5 arranged in sequence along a first direction. Figure 1 The direction indicated by arrow A is the first direction. The coextruded surface layer 1, coextruded middle layer 3, and coextruded inner layer 5 each comprise at least one layer of post-consumer recycled polyolefin material. The layer of coextruded surface layer 1 and coextruded inner layer 5, distal from the coextruded middle layer 3, is a virgin polyolefin material layer. The use of a large amount of post-consumer recycled polyolefin material in this barrier composite sheet reduces the demand for new raw materials, helping to lower environmental pressure and reduce the consumption of fossil raw materials. The use of virgin polyolefin material in the outermost and innermost layers provides excellent sealing and surface finish.

[0027] In the coextruded surface layer 1 and coextruded inner layer 5, polyolefin materials from different sources are combined through multi-layer coextrusion lamination, resulting in excellent integrity and barrier properties. Similarly, the coextruded middle layer 3 is also combined through multi-layer coextrusion lamination, achieving excellent integrity. Finally, a bonding layer is used to bond the coextruded surface layer 1, the coextruded middle layer 3, and the coextruded inner layer 5 together to form a barrier composite sheet. This composite sheet, prepared by coextruding the surface layer, middle layer, and inner layer separately and then bonding and laminating them as a whole, not only has a stable overall structure, but also, due to its multi-layered manufacturing, fundamentally eliminates the possibility of penetrating micropores or bubbles in the sheet, significantly improving barrier properties and paving the way for the increased use of recycled polyolefin materials.

[0028] Preferably, the coextruded surface layer 1 is formed by coextrusion of 2 to 9 layers of polyolefins. Except for the layer distal to the coextruded middle layer 3, all other layers are made of post-consumer recycled polyolefin material. For example, in a three-layer structure, the layer distal to the coextruded middle layer 3 is made of virgin polyolefin material, while the remaining two layers are made of post-consumer recycled polyolefin material, i.e., polyolefin material layers made of recycled particles or a mixture of recycled and virgin particles.

[0029] Preferably, the coextruded inner layer 5 is formed by coextrusion of 2 to 9 layers of polyolefin. Except for the layer distal to the coextruded middle layer 3, all other layers are made of post-consumer recycled polyolefin material. For example, in a four-layer structure, the layer distal to the coextruded middle layer 3 is made of virgin polyolefin material, while the remaining three layers are made of post-consumer recycled polyolefin material, i.e., polyolefin material layers made of recycled particles or a mixture of recycled and virgin particles.

[0030] Preferably, the co-extruded middle layer 3 is formed by co-extrusion of 2 to 9 layers of polyolefin, each layer being a post-consumer recycled polyolefin material layer. Taking a three-layer structure as an example, all layers are post-consumer recycled polyolefin material layers.

[0031] In this way, by employing multi-layer coextrusion to combine polyolefin materials from different sources (virgin and post-consumer recycled), the multi-layer structure can form a more complex barrier, effectively preventing the penetration of gases, moisture, and other substances. Using virgin polyolefin materials as the outermost and innermost layers of the coextruded surface layer 1 and coextruded inner layer 5 ensures that the composite sheet has excellent sealing properties and surface finish. Compared to recycled materials, virgin polyolefin materials have more consistent properties and better processing characteristics, which helps to form a smooth, defect-free surface. The extensive use of post-consumer recycled polyolefin materials in the coextruded surface layer 1, coextruded inner layer 5, and coextruded middle layer 3 significantly reduces the demand for new raw materials, reduces the consumption of fossil raw materials, and reduces environmental pollution, which is more in line with the concept of a circular economy.

[0032] Optionally, the first and second adhesive layers 2 and 4 can be made of polyolefins. Furthermore, to achieve superior bonding strength and enhance the integrity of the barrier composite sheet, ethylene-acrylic acid copolymer (EAA) or ethylene-methacrylic acid copolymer (EMAA) can be used as the first and second adhesive layers 2 and 4. Preferably, the thickness of the first and second adhesive layers 2 and 4 is controlled between 5 and 50 μm, more preferably between 10 and 35 μm, for example, 12 μm, 18 μm, 22 μm, or 27 μm. EAA and EMAA exhibit excellent adhesion to both virgin and recycled polyolefins, effectively and tightly bonding the coextruded surface layer 1, coextruded middle layer 3, and coextruded inner layer 5 together to form a highly cohesive, non-delamination composite structure. This strong interlayer bonding helps maintain the stability and durability of the composite sheet under various environmental conditions. In addition to providing mechanical adhesion, EAA and EMAA also possess barrier properties, particularly against water vapor and oxygen permeation. Therefore, they not only strengthen the interlayer bonding of the composite sheet, but also add an extra layer of barrier protection, further improving the barrier effect of the entire sheet.

[0033] As mentioned above, the coextruded intermediate layer 3 is preferably formed by coextrusion of 2 to 9 layers of polyolefin, each of which is made of post-consumer recycled polyolefin material. Furthermore, one or both sides of the coextruded intermediate layer 3 are coated with an ethylene-vinyl alcohol copolymer (EVOH) coating. EVOH has extremely high barrier properties, effectively preventing the permeation of oxygen, carbon dioxide, and other gases. This makes the barrier composite sheet ideal for packaging food, beverages, and other products that require long-term freshness and stability.

[0034] Preferably, the post-consumer recycled polyolefin material layer is a post-consumer recycled polyethylene material layer; and the virgin polyolefin material layer is a virgin polyethylene material layer.

[0035] Example 2

[0036] Compared with Example 1, the barrier composite sheet provided in this embodiment is different in that: a polyurethane adhesive layer 6 is further provided between the first adhesive layer 2 and the co-extruded intermediate layer 3. Figure 2 shown.

[0037] Preferably, the polyurethane adhesive layer 6 is formed by coating a polyurethane adhesive, and the coating amount is 1.5-10g per square meter, more preferably 2-6g per square meter, for example, 3.5g, 4.0g, 4.7g, 5.2g, 5.6g, etc. per square meter.

[0038] Due to its high adhesive properties, the polyurethane binder significantly enhances the bond strength between the first adhesive layer 2 and the coextruded intermediate layer 3, further improving the integrity of the composite sheet and enhancing its overall stability and durability in the event of external impact or temperature fluctuations. The polyurethane binder itself possesses certain barrier properties, particularly strong against gases such as oxygen and water vapor, further reducing the permeability of gases and moisture, thereby enhancing the barrier effectiveness of the entire composite sheet and making it more suitable for the packaging of demanding high-end cosmetics.

[0039] Example 3

[0040] like Figure 3 A packaging hose shown has a flexible tube body made from the barrier composite sheet of Example 1 or Example 2. During the manufacturing process, the overall percentage of recycled material is adjusted by varying the number and thickness of virgin polyolefin and post-consumer recycled polyolefin layers in the coextruded surface layer 1, coextruded middle layer 3, and coextruded inner layer 5. For example, increasing the number or thickness of recycled material layers while reducing the number or thickness of virgin material layers can increase the percentage of recycled material. Preferably, the recycled polyolefin content of the barrier composite sheet used in manufacturing the tube body is adjusted to 30%-90% of the total mass of the tube body.

[0041] The above embodiments are illustrative and intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A barrier composite sheet, characterized in that: It includes a co-extruded surface layer, a first adhesive layer, a co-extruded middle layer, a second adhesive layer and a co-extruded inner layer arranged in sequence along a first direction; Among them, the coextruded surface layer, the coextruded middle layer and the coextruded inner layer all include at least one layer of post-consumer recycled polyolefin material, and a layer on the coextruded surface layer and the coextruded inner layer away from the coextruded middle layer is a virgin polyolefin material layer.

2. The barrier composite sheet according to claim 1, characterized in that: The co-extruded surface layer is formed by co-extrusion and compounding 2 to 9 layers of polyolefins. Except for a layer away from the co-extruded middle layer, the remaining layers are all layers of post-consumer recycled polyolefin materials.

3. The barrier composite sheet according to claim 1, characterized in that: The co-extruded inner layer is formed by co-extrusion and compounding 2 to 9 layers of polyolefins. Except for a layer away from the co-extruded middle layer, the remaining layers are all layers of post-consumer recycled polyolefin materials.

4. The barrier composite sheet according to claim 1, characterized in that: The co-extruded middle layer is composited by 2 to 9 layers of post-consumer recycled polyolefin material.

5. The barrier composite sheet according to claim 1, characterized in that: The first adhesive layer and the second adhesive layer are polyolefin layers.

6. The barrier composite sheet according to claim 1, characterized in that: The first adhesive layer and the second adhesive layer are selected from ethylene-acrylic acid copolymer or ethylene-methacrylic acid copolymer.

7. The barrier composite sheet according to claim 1, characterized in that: The post-consumer recycled polyolefin material layer is a post-consumer recycled polyethylene material layer; the virgin polyolefin material layer is a virgin polyethylene material layer.

8. The barrier composite sheet according to any one of claims 1 to 7, characterized in that: A polyurethane adhesive layer is further provided between the first adhesive layer and the co-extruded intermediate layer.

9. A packaging hose, characterized in that: The invention comprises a flexible pipe body, wherein the pipe body is made of the barrier composite sheet according to any one of claims 1 to 8.

10. The packaging hose according to claim 9, characterized in that: The recycled polyolefin material contained in the barrier composite sheet accounts for 30%-90% of the total mass.

Images