Long-acting preservative paper with multi-layer structure

Abstract

The utility model aims to provide a multi-layer structure long-acting preservative paper, which comprises a base film, a first slow-release layer, a buffer layer, a second slow-release layer and a waterproof breathable layer, the first slow-release layer is arranged on one side surface of the base film, the buffer layer is arranged on one side surface, far away from the base film, of the first slow-release layer, and the second slow-release layer is arranged on the waterproof breathable layer. The second slow-release layer is arranged on the side face, away from the first slow-release layer, of the buffer layer, the waterproof breathable layer comprises a PE macromolecule breathable film and non-woven fabric, the non-woven fabric and the PE macromolecule breathable film are sequentially arranged on the side face, away from the buffer layer, of the second slow-release layer, and the non-woven fabric is used for making contact with vegetables and fruits. Therefore, the buffer layer is arranged between the first slow-release layer and the second slow-release layer, so that the decomposition period of sulfur dioxide is effectively prolonged, and the water is not easy to lose by arranging the waterproof breathable layer, so that the fresh-keeping effect on vegetables and fruits can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fruit preservation, in particular to a multi-layer structure long-term fresh-keeping paper. Background Art

[0002] Freshly picked fruits and vegetables will rot quickly if they are not preserved. For economic and nutritional reasons, they need to be preserved.

[0003] There are two main reasons why fruits and vegetables rot quickly after being picked. One is the respiration of the fruit and vegetable cells themselves, and the other is the consumption of bacteria and other microorganisms, which causes the moisture of fruits and vegetables to disappear quickly, especially when the temperature is moderate. Therefore, the preservation of fruits and vegetables needs to solve the following two problems. The first is to reduce the temperature to reduce the respiration of fruits and vegetables themselves and the biological activity of microorganisms, and the second is to reduce water loss. Among them, the current method is to cool fruits and vegetables through long-distance cold chain transportation, and to retain moisture in fruits and vegetables by packaging them in fresh-keeping bags. The combination of the two can extend the shelf life of fruits and vegetables as much as possible.

[0004] However, the existing preservation method has the following disadvantages: fruits and vegetables carry different microorganisms after being picked, and even if they are stored at low temperatures during cold chain transportation, they will still undergo a certain degree of biochemical reaction in the preservation bag. Therefore, in order to further increase the shelf life of fruits and vegetables, the multi-layer structure long-term preservation paper of the present application is proposed. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a multi-layered long-term fresh-keeping paper which can effectively inhibit bacteria and retain water for fruits and vegetables.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A multi-layered long-lasting fresh-keeping paper, comprising:

[0008] Basement membrane;

[0009] A first sustained-release layer, wherein the first sustained-release layer is disposed on one side of the base film;

[0010] A buffer layer, the buffer layer being disposed on a side of the first sustained-release layer away from the base film;

[0011] A second sustained-release layer, the second sustained-release layer is disposed on a side of the buffer layer away from the first sustained-release layer;

[0012] The waterproof and breathable layer comprises a PE polymer breathable film and a non-woven fabric. The non-woven fabric and the PE polymer breathable film are sequentially arranged on a side of the second sustained-release layer away from the buffer layer. The non-woven fabric is used to contact with vegetables and fruits.

[0013] Optionally, the base film is made of PET.

[0014] Optionally, the base film has a thickness of 12 μm to 36 μm.

[0015] Optionally, the first sustained-release layer and the second sustained-release layer are both made of a sustained-release agent, an adhesive, and sodium pyrosulfite.

[0016] Optionally, the thickness of the first sustained-release layer and the thickness of the second sustained-release layer are both 15 μm to 30 μm.

[0017] Optionally, the buffer layer is made of polytetrafluoroethylene.

[0018] Optionally, the buffer layer has a thickness of 12 μm to 28 μm.

[0019] Optionally, a plurality of bonding points are provided between the non-woven fabric and the PE polymer breathable membrane.

[0020] Optionally, the waterproof and breathable layer has a thickness of 50 μm to 80 μm.

[0021] Compared with the prior art, the utility model has at least the following advantages:

[0022] The utility model discloses a multi-layer structure long-lasting fresh-keeping paper, comprising a base film, a first slow-release layer, a buffer layer, a second slow-release layer and a waterproof breathable layer, wherein the first slow-release layer is arranged on one side of the base film, the buffer layer is arranged on one side of the first slow-release layer away from the base film, the second slow-release layer is arranged on one side of the buffer layer away from the first slow-release layer, the waterproof breathable layer comprises a PE polymer breathable film and a non-woven fabric, the non-woven fabric and the PE polymer breathable film are arranged on one side of the second slow-release layer away from the buffer layer in sequence, and the non-woven fabric is used to contact with fruits and vegetables. Thus, by arranging the buffer layer between the first slow-release layer and the second slow-release layer, the decomposition cycle of sulfur dioxide is effectively increased, and by arranging the waterproof breathable layer, water is not easily lost, thereby improving the fresh-keeping effect on fruits and vegetables. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 The present invention is a schematic structural diagram of a multi-layer long-lasting fresh-keeping paper according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 10. Multi-layered long-lasting fresh-keeping paper; 100. base film; 200. first sustained-release layer; 300. buffer layer; 400. second sustained-release layer; 500. waterproof and breathable layer; 510. PE polymer breathable film; 520. non-woven fabric. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings show preferred embodiments of the present invention.

[0028] like Figure 1 As shown, a multi-layer long-lasting fresh-keeping paper 10 comprises a base film 100, a first slow-release layer 200, a buffer layer 300, a second slow-release layer 400 and a waterproof breathable layer 500. The first slow-release layer 200 is arranged on one side of the base film 100, the buffer layer 300 is arranged on one side of the first slow-release layer 200 away from the base film 100, the second slow-release layer 400 is arranged on one side of the buffer layer 300 away from the first slow-release layer 200, the waterproof breathable layer 500 comprises a PE polymer breathable film 510 and a non-woven fabric 520, the non-woven fabric 520 and the PE polymer breathable film 510 are sequentially arranged on one side of the second slow-release layer 400 away from the buffer layer 300, and the non-woven fabric 520 is used to contact with fruits and vegetables.

[0029] It should be noted that the base film 100 is used as the base structure of the multi-layer long-term fresh-keeping paper 10, which is used to carry the first slow-release layer 200, the buffer layer 300, the second slow-release layer 400 and the waterproof breathable layer 500. In one embodiment, it is made of PET. Further, the thickness of the base film 100 ranges from 12μm to 36μm. The first slow-release layer 200 and the second slow-release layer 400 are both used to release sulfur dioxide, wherein the second slow-release layer 400 and the first slow-release layer 200 are separated by the buffer layer 300. The waterproof breathable layer 500 formed by the PE polymer breathable film 510 and the non-woven fabric 520 is sequentially arranged on the outside of the second slow-release layer 400. In this way, when the multi-layer long-term fresh-keeping paper 10 is used to package fruits and vegetables, one side of the non-woven fabric 520 is attached to the fruits and vegetables. Under the action of the waterproof and breathable layer 500, the moisture of fruits and vegetables is blocked to reduce the loss of moisture, but the waterproof and breathable layer 500 does not hinder the passage of gas (including water vapor). The sulfur dioxide formed by the decomposition of the second slow-release layer 400 will contact the fruits and vegetables through the waterproof and breathable layer 500, so that the sulfur dioxide can effectively inhibit the fruits and vegetables. Furthermore, since the buffer layer 300 is separated between the first slow-release layer 200 and the second slow-release layer 400, the release rate of sulfur dioxide in the first slow-release layer 200 will be slower than the release rate of sulfur dioxide in the second slow-release layer 400, that is, the consumption time of sulfur dioxide is effectively increased, thereby increasing the inhibition time of bacteria. In this way, by reducing water loss and reducing the release cycle of sulfur dioxide, the preservation effect of fruits and vegetables is effectively improved.

[0030] In one embodiment, the first sustained-release layer 200 and the second sustained-release layer 400 are both made of a sustained-release agent, an adhesive, and sodium pyrosulfite. Among them, the sustained-release agent is polyvinyl alcohol or polyacrylic acid, and the adhesive is starch or gelatin. The manufacturing process of the first sustained-release layer 200 and the second sustained-release layer 400 can use the existing manufacturing process in the industry. Further, in one embodiment, the thickness of the first sustained-release layer 200 and the thickness of the second sustained-release layer 400 are both 15μm to 30μm.

[0031] In one embodiment, the buffer layer 300 is made of polytetrafluoroethylene, and the thickness of the buffer layer 300 is 12 μm to 28 μm. It should be noted that polytetrafluoroethylene is formed into a microporous membrane structure by mechanical stretching, wherein the diameter of the micropores ranges from 0.25 μm to 0.35 μm. In this way, it is ensured that the sulfur dioxide molecules of the first sustained-release layer 200 can pass through the buffer layer 300.

[0032] In one embodiment, the PE polymer breathable membrane 510 is made of a polyolefin raw material such as linear low-density polyethylene, high-density polyethylene, etc., uniformly mixed with functional inorganic substances (such as calcium carbonate particles). During the production process, the boundaries of the calcium carbonate particles are peeled off from the polymer through mechanical stretching, thereby forming a tortuous channel, so that the PE polymer breathable membrane 510 can be breathable.

[0033] In one embodiment, a plurality of bonding points are provided between the non-woven fabric 520 and the PE polymer breathable film 510. Specifically, a plurality of hot pressing points are provided between the non-woven fabric 520 and the PE polymer breathable film 510, wherein the hot pressing points are circular or elliptical, and the maximum diameter of the hot pressing points is less than 1 mm, and the distance between any two adjacent hot pressing points is 3 mm ± 0.5 mm. In this way, the plurality of hot pressing points are used to ensure that the non-woven fabric 520 and the PE polymer breathable film 510 are well attached and fixed, and the softness of the non-woven fabric 520 is ensured, so that the fruits and vegetables can be better protected.

[0034] Furthermore, in one embodiment, the waterproof breathable layer 500 has a thickness of 50 μm to 80 μm, wherein the thickness of the PE polymer breathable membrane 510 is 20 μm to 30 μm.

[0035] In one embodiment, the first sustained-release layer 200, the buffer layer 300, the second sustained-release layer 400, and the PE polymer breathable film 510 are laminated into a whole through a hot pressing process. Finally, the non-woven fabric 520 and the PE polymer breathable film 510 are subjected to multi-point hot pressing.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A multi-layered long-lasting fresh-keeping paper, characterized in that: include: Basement membrane; A first sustained-release layer, wherein the first sustained-release layer is disposed on one side of the base film; A buffer layer, the buffer layer being disposed on a side of the first sustained-release layer away from the base film; A second sustained-release layer, the second sustained-release layer is disposed on a side of the buffer layer away from the first sustained-release layer; The waterproof and breathable layer comprises a PE polymer breathable film and a non-woven fabric. The non-woven fabric and the PE polymer breathable film are sequentially arranged on a side of the second sustained-release layer away from the buffer layer. The non-woven fabric is used to contact with vegetables and fruits.

2. The multi-layered long-lasting fresh-keeping paper according to claim 1, characterized in that: The base film is made of PET.

3. The multi-layered long-lasting fresh-keeping paper according to claim 2, characterized in that: The base film has a thickness of 12 μm to 36 μm.

4. The multi-layered long-lasting fresh-keeping paper according to claim 1, characterized in that: The thickness of the first sustained-release layer and the thickness of the second sustained-release layer are both 15 μm to 30 μm.

5. The multi-layered long-lasting fresh-keeping paper according to claim 1, characterized in that: The buffer layer is made of polytetrafluoroethylene.

6. The multi-layered long-lasting fresh-keeping paper according to claim 5, characterized in that: The thickness of the buffer layer is 12 μm to 28 μm.

7. The multi-layered long-lasting fresh-keeping paper according to claim 1, characterized in that: A plurality of bonding points are arranged between the non-woven fabric and the PE polymer breathable film.

8. The multi-layered long-lasting fresh-keeping paper according to claim 7, characterized in that: The thickness of the waterproof and breathable layer is 50 μm to 80 μm.

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