Grease-proof corrugated board suitable for cold-chain logistics

Abstract

The utility model provides a grease-proof corrugated board suitable for cold-chain logistics, which sequentially comprises a grease-proof coating, a low-temperature-resistant PLA (polylactic acid) lamination layer, a wavy buffer layer, a rebound filling layer, a degradable PE (polyethylene) preservative film layer, an oil-resistant coating, a honeycomb board layer, an oleophobic activated carbon non-woven fabric layer and a high-density corrugated paper inner layer from outside to inside, and the rebound filling layer is correspondingly arranged in a corrugated gap of the wavy buffer layer in a filling manner. High low temperature resistance and grease permeation resistance are realized.

Description

Technical Field

[0001] This utility model relates to the field of corrugated cardboard technology, and in particular to an oil-resistant corrugated cardboard suitable for cold chain logistics. Background Technology

[0002] Chinese Patent Publication No. CN222499858U, published on February 18, 2025, discloses a green and environmentally friendly impact-resistant corrugated cardboard, including a waterproof layer. The bottom of the waterproof layer has a first corrugated pressure-resistant layer, and the bottom of the first corrugated pressure-resistant layer has a first honeycomb board. The bottom of the first honeycomb board is fixedly connected to a first inner board. The first corrugated pressure-resistant layer includes an outer shell and a corrugated plate, with the corrugated plate improving the pressure resistance of the outer shell. The first honeycomb board includes an inner board, honeycomb holes, and activated carbon. The outer shell, corrugated plate, and reinforcing plate enhance the pressure resistance of the first corrugated pressure-resistant layer. The inner board, honeycomb holes, and cross-shaped plate improve the frontal pressure resistance of the first honeycomb board. The multiple layers—first inner board, second inner board, second honeycomb board, and second corrugated pressure-resistant layer—further enhance the impact resistance of the device and prevent deformation upon impact. The existing technology has the following drawbacks: although the multi-layer composite structure has good impact resistance, waterproof, moisture-proof and odor removal functions, its low temperature resistance and oil penetration resistance are weak for the food cold chain transportation industry. In view of this, it is urgent to improve. Utility Model Content

[0003] Based on this, the purpose of this utility model is to provide an anti-grease corrugated cardboard suitable for cold chain logistics, which has high low temperature resistance and anti-grease penetration performance.

[0004] This utility model provides an anti-grease corrugated cardboard suitable for cold chain logistics, which includes, from the outside to the inside, an anti-grease coating, a low-temperature resistant PLA coating layer, a corrugated buffer layer, a resilient filling layer, a biodegradable PE preservation film layer, an anti-oil coating, a honeycomb board layer, an oleophobic activated carbon nonwoven fabric layer, and a high-density corrugated paper inner layer. The resilient filling layer is correspondingly filled in the corrugated gaps of the corrugated buffer layer.

[0005] Preferably, the rebound filler layer is configured as a glycerol-plasticized starch-based elastomer foam layer.

[0006] Preferably, the low-temperature resistant PLA coating layer is configured as a PLA / PBAT blend modified film layer.

[0007] Preferably, the anti-grease coating is a nano-scale silica / beeswax composite layer.

[0008] Preferably, the thickness of the biodegradable PE preservation film layer is set to 0.02 mm.

[0009] Preferably, the anti-oil coating is configured as a carboxymethyl cellulose solution immersion layer.

[0010] Preferably, the surface of the inner layer of the high-density corrugated paper is laminated with an aluminum foil backing layer.

[0011] Preferably, the thickness of the aluminum foil backing layer is set to 6 μm.

[0012] The beneficial effects of this utility model are as follows: By setting a combined structure of an anti-grease coating and a low-temperature resistant PLA film layer, the structure can maintain its toughness at -30℃, avoiding brittleness and forming a dense barrier film, thus improving the resistance to grease penetration. The combined structure of a corrugated buffer layer and a resilient filling layer ensures good compression resilience at -20℃. Furthermore, the biodegradable PE preservation film layer protects the corrugated buffer layer and resilient filling layer, preventing condensation from seeping in and softening the corrugated buffer layer, thus extending its service life. The combined structure of an anti-oil coating, a honeycomb panel layer, and an oleophobic activated carbon nonwoven fabric layer enhances the anti-oil function, while the oleophobic activated carbon nonwoven fabric layer prevents grease from clogging the pores. Attached Figure Description

[0013] Figure 1 This is a cross-sectional schematic diagram of the present invention.

[0014] The attached figures are labeled as follows: 10. Anti-grease coating; 11. Low-temperature resistant PLA coating layer; 12. Corrugated buffer layer; 13. Resilient filling layer; 14. Biodegradable PE food preservation film layer; 15. Anti-oil coating; 16. Honeycomb panel layer; 17. Oleophobic activated carbon nonwoven fabric layer; 18. High-density corrugated paper inner layer. Detailed Implementation

[0015] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with specific embodiments and accompanying drawings.

[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] Please refer to Figure 1As shown, this utility model provides an grease-resistant corrugated cardboard suitable for cold chain logistics. From the outside to the inside, it comprises an grease-resistant coating 10, a low-temperature resistant PLA film layer 11, a corrugated cushioning layer 12, a resilient filler layer 13, a biodegradable PE preservation film layer 14, an anti-oil coating 15, a honeycomb layer 16, an oleophobic activated carbon nonwoven fabric layer 17, and a high-density corrugated inner layer 18. The resilient filler layer 13 is correspondingly filled within the corrugated gaps of the corrugated cushioning layer 12. The resilient filler layer 13 is a glycerol-plasticized starch-based elastomer foam layer. The low-temperature resistant PLA film layer 11 is a PLA / PBAT blend modified film layer, and the grease-resistant coating 10 is a nano-scale silica / beeswax composite layer. The thickness of the biodegradable PE preservation film layer 14 is 0.02 mm. The anti-oil coating 15 is a carboxymethyl cellulose solution impregnation layer.

[0018] In actual production, a corrugated paper machine is first used to make a wavy buffer layer 12, followed by a low-temperature resistant PLA coating layer 11, then an anti-grease coating 10 is sprayed on, followed by a rebound filling layer 13, and then a biodegradable PE preservation film layer 14 is attached. Then, the surface of the bamboo pulp honeycomb board layer 16 is soaked in carboxymethyl cellulose solution to form an anti-oil coating 15, which is then dried. Next, an oleophobic activated carbon nonwoven fabric layer 17 is attached, which can absorb odors and prevent oil. Finally, a high-density corrugated paper inner layer 18 is attached.

[0019] In a preferred embodiment, the surface of the high-density corrugated inner layer 18 is laminated with an aluminum foil backing layer, which is bonded together by a cold pressing process. This layer reflects cold air, reduces temperature fluctuations inside the corrugated board, and achieves low-temperature insulation. The thickness of the aluminum foil backing layer is set to 6 μm.

[0020] In this embodiment, the combined structure of an anti-grease coating and a low-temperature resistant PLA film layer ensures that the structure maintains its toughness at -30℃, preventing brittleness and forming a dense barrier film to improve resistance to grease penetration. The combined structure of a corrugated buffer layer and a resilient filler layer ensures good compression resilience at -20℃. Furthermore, a biodegradable PE preservation film layer protects this structure, preventing condensation from softening the corrugated buffer layer and extending its lifespan. Finally, the combined structure of an anti-oil coating, a honeycomb panel layer, and an oleophobic activated carbon nonwoven fabric layer enhances anti-oil properties while preventing grease from clogging the pores. This structure achieves a breakthrough improvement in low-temperature resistance and anti-grease performance while maintaining recyclability and food safety, making it suitable for the upgrading needs of high-end frozen food packaging, such as high-oil frozen foods and cold chain logistics.

[0021] The above-described embodiments are merely one implementation of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A type of grease-resistant corrugated cardboard suitable for cold chain logistics, characterized in that, From the outside to the inside, the layers include an anti-grease coating (10), a low-temperature resistant PLA coating layer (11), a corrugated buffer layer (12), a resilient filling layer (13), a biodegradable PE food preservation film layer (14), an anti-oil coating (15), a honeycomb panel layer (16), an oleophobic activated carbon nonwoven fabric layer (17), and a high-density corrugated paper inner layer (18). The resilient filling layer (13) is filled in the corrugated gaps of the corrugated buffer layer (12).

2. The grease-resistant corrugated cardboard suitable for cold chain logistics according to claim 1, characterized in that: The rebound filler layer (13) is configured as a glycerol-plasticized starch-based elastomer foam layer.

3. The grease-resistant corrugated cardboard suitable for cold chain logistics according to claim 1, characterized in that: The low-temperature resistant PLA coating layer (11) is configured as a PLA / PBAT blend modified film layer.

4. The grease-resistant corrugated cardboard suitable for cold chain logistics according to claim 1, characterized in that: The anti-grease coating (10) is configured as a nano-scale silica / beeswax composite layer.

5. The grease-resistant corrugated cardboard suitable for cold chain logistics according to claim 1, characterized in that: The thickness of the biodegradable PE preservation film layer (14) is set to 0.02 mm.

6. The grease-resistant corrugated cardboard suitable for cold chain logistics according to claim 1, characterized in that: The anti-oil coating (15) is configured as a carboxymethyl cellulose solution soaking layer.

7. The grease-resistant corrugated cardboard suitable for cold chain logistics according to claim 1, characterized in that: The surface of the high-density corrugated paper inner layer (18) is laminated with an aluminum foil backing paper layer.

8. The grease-resistant corrugated cardboard suitable for cold chain logistics according to claim 7, characterized in that: The thickness of the aluminum foil backing layer is set to 6 μm.

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