Food packaging film capable of changing color according to temperature

Abstract

The utility model discloses a food packaging film capable of changing color according to temperature, and relates to the technical field of food packaging, the food packaging film comprises a food packaging film, the food packaging film comprises a food contact layer, the food contact layer is made of polyethylene (PE) material, the surface of the food contact layer is fixedly connected with a reinforcing layer, and the surface of the reinforcing layer is fixedly connected with the food contact layer. The reinforcing layer is made of an ethylene-vinyl acetate copolymer material, a detection layer is arranged on the side, away from the food contact layer, of the reinforcing layer, the detection layer is made of color-changing ink, a wear-resistant layer is fixedly connected to the side, away from the detection layer, of the isolation layer, and the wear-resistant layer is a polyamide film. And the arranged plastic films are all made of transparent materials, so that workers can directly see the color of the detection layer conveniently, the storage temperature of the food can be roughly analyzed, the workers do not need to enter a compartment or a cab again, and people can judge the food transportation temperature conveniently.

Description

Technical Field

[0001] This utility model relates to the field of food packaging technology, and in particular to a food packaging film that can change color according to temperature. Background Technology

[0002] Food packaging film is a type of packaging design. In order to facilitate the preservation and storage of food, product packaging film has been developed. Food packaging film refers to a thin film that comes into direct contact with food. It is used to wrap the surface of food and is mainly used to isolate the entry of microorganisms and bacteria and foreign contaminants, prevent and prolong the spoilage of food. It is a polymer material that also has the function of ensuring the freshness and health of food, allowing food to be stored for a longer period of time.

[0003] Food products require cold chain transportation during transport, which necessitates freezing and refrigeration. However, in most existing transport vehicles, the temperature display is typically located in the driver's seat or inside the vehicle. Confirming the temperature of transported food often requires entering the vehicle or re-entering the driver's cab, which is quite cumbersome. To address this issue, a food packaging film that changes color according to temperature is proposed. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a food packaging film that can change color according to temperature, thereby solving the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a food packaging film that can change color according to temperature, comprising a food packaging film, the food packaging film including a food contact layer, the food contact layer being made of polyethylene (PE), a reinforcing layer being fixedly connected to the surface of the food contact layer, the reinforcing layer being made of ethylene-vinyl acetate copolymer, and a detection layer being provided on the side of the reinforcing layer away from the food contact layer, the detection layer being made of color-changing ink.

[0006] Preferably, an isolation layer is fixedly connected to the side of the detection layer away from the reinforcing layer, and the isolation layer is made of ultra-high molecular weight polyethylene film.

[0007] Preferably, a wear-resistant layer is fixedly connected to the side of the insulating layer away from the detection layer, and the wear-resistant layer is a polyamide film.

[0008] Preferably, a protective film is fixedly connected to the surface of the food packaging film, and the protective film is also made of transparent material.

[0009] Preferably, sealing strips are fixedly connected to both sides of the surface of the food packaging film, and the sealing strips are divided into two parts.

[0010] Preferably, the surface of the food packaging film has a tear-off opening, which is arc-shaped.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) The food packaging film that changes color according to temperature has a detection layer. Since the plastic film is made of transparent material, the staff can directly see the color of the detection layer and make a rough analysis of the storage temperature of the food without having to enter the carriage or the driver's cab again, which makes it easier for people to judge the temperature of food transportation.

[0013] (2) The food packaging film that changes color according to temperature can directly cover and wrap the food by setting the food contact layer. When the food contact layer is made of polyethylene (PE), the food is isolated from the outside world, thereby reducing the spoilage of the food during transportation. In addition, polyethylene (PE) material has excellent low temperature resistance, high safety and non-toxicity, so the food contact layer can protect the stored food well, further improving the use effect of the packaging film.

[0014] (3) The food packaging film that can change color according to temperature, through the setting of the wear-resistant layer, and the wear-resistant layer is made of polyamide film, takes advantage of the high strength and toughness of polyamide film and the good anti-puncture effect, so as to cover and protect the transported goods, and reduce the damage to the packaging film during transportation, thereby reducing the food spoilage due to film damage during transportation, thus reducing the increased cost of food spoilage due to packaging damage, and further improving the use effect of the packaging film.

[0015] (4) The food packaging film that changes color according to temperature has an easy-tear opening, which makes it easy for users to open the packaging film and quickly take out the food inside the packaging film. At the same time, the sealing strip can seal the food inside the packaging film and prevent the outside air from contacting the food, thereby delaying the time of food spoilage. This allows users to selectively seal uneaten food, further facilitating the use of the device and improving its effectiveness. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of the structure of the food packaging film of this utility model;

[0018] Figure 2This is a schematic diagram of the sealing strip of this utility model;

[0019] Figure 3 This is a schematic diagram of the interior of the food packaging film of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the food packaging film of this utility model.

[0021] Reference numerals: 1. Food packaging film; 101. Food contact layer; 102. Reinforcing layer; 103. Detection layer; 104. Barrier layer; 105. Wear-resistant layer; 2. Tear-opening opening; 3. Sealing strip; 4. Protective film. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a food packaging film that can change color according to temperature, including a food packaging film 1, the food packaging film 1 including a food contact layer 101, the food contact layer 101 is made of polyethylene (PE), which has excellent low temperature resistance, can maintain flexibility at -50 degrees Celsius, is not easy to break, has high safety, is non-toxic, and meets the food contact material standards of FDA, EU and other standards, thus it can safely come into contact with food, so that the food contact layer 101 can package and store food.

[0024] A reinforcing layer 102 is fixedly connected to the surface of the food contact layer 101. The reinforcing layer 102 is made of ethylene-vinyl acetate copolymer, which has good flexibility, remains soft at low temperatures, and has strong adhesion. It is often combined with other materials (such as PE) for use in cling film or sealing bags. By combining the food contact layer 101 with this material, the overall toughness of the food packaging film 1 is increased, thereby increasing the tensile strength of the structure and the overall strength of the food packaging film 1. This makes the food packaging bag less prone to crush damage, thus improving the protection of the food. At the same time, it isolates items placed behind it, preventing them from contacting the food and reducing the possibility of food contamination.

[0025] A detection layer 103 is provided on the side of the reinforcing layer 102 away from the food contact layer 101. The material of the detection layer 103 is color-changing ink, which is green at -18 degrees Celsius and yellow otherwise. This allows the device to detect the ambient temperature during cold chain transportation based on the setting of the detection layer 103, enabling staff to quickly make a rough analysis of the storage temperature of the food and improve the effectiveness of the packaging film.

[0026] An isolation layer 104 is fixedly connected to the side of the detection layer 103 away from the reinforcing layer 102. The isolation layer 104 is made of ultra-high molecular weight polyethylene film, which has good barrier properties and can cover and block the detection layer 103 to prevent it from contacting the outside world. It also has good low-temperature performance, can withstand temperatures as low as -100 degrees Celsius while remaining flexible, and has good stability.

[0027] A wear-resistant layer 105 is fixedly connected to the side of the isolation layer 104 away from the detection layer 103. The wear-resistant layer 105 is a polyamide film. The polyamide film has high strength and toughness and good puncture resistance, thereby increasing the protective effect of the food packaging film 1 during transportation and thus protecting the packaged food.

[0028] Furthermore, the food contact layer 101, reinforcing layer 102, insulating layer 104, and wear-resistant layer 105 are all made of transparent material, allowing the detection layer 103 to be observed.

[0029] A protective film 4 is fixedly connected to the surface of the food packaging film 1. The protective film 4 is also made of transparent material, which further covers and protects the food packaging film 1, thereby further improving the protection effect on the food.

[0030] Both sides of the food packaging film 1 are fixedly connected with sealing strips 3, i.e. self-sealing strips, which can be fastened and sealed to seal the food packaging film 1 after it has been opened, thereby isolating the food inside the food packaging film 1 from the air and extending the food's shelf life.

[0031] The food packaging film 1 has a tear-opening 2 on its surface. The tear-opening 2 is arc-shaped, which makes it easy for users to tear open the food packaging film 1 and take out the food inside.

[0032] Working principle: When the user needs to remove the food stored inside the food packaging film 1, the food packaging film 1 is taken out of the storage room. Then, the user tears the packaging through the tear-off slit 2, thereby opening the packaging and removing the food inside the food packaging film 1. The removed food can then be processed or consumed. If there is unused food, after removing the food, the user can press the sealing strip 3, causing the sealing strip 3 to adhere under force, thus sealing the food packaging film 1 and isolating the food from the outside world. This protects the food, reduces the chance of spoilage, and further improves the effectiveness of the device.

[0033] Furthermore, during the transportation of food packaging film 1, the protective film 4 and the wear-resistant layer 105 can protect the exterior of food packaging film 1, reducing the possibility of damage to food packaging film 1 and further improving the protection effect on food. At the same time, staff can directly observe the detection layer 103 to make a rough analysis of the temperature at which the food is stored.

[0034] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A food packaging film capable of changing color according to temperature, comprising a food packaging film (1), characterized in that: The food packaging film (1) includes a food contact layer (101), which is made of polyethylene (PE). A reinforcing layer (102) is fixedly connected to the surface of the food contact layer (101). The reinforcing layer (102) is made of ethylene-vinyl acetate copolymer. A detection layer (103) is provided on the side of the reinforcing layer (102) away from the food contact layer (101). The detection layer (103) is made of color-changing ink.

2. The food packaging film that changes color according to temperature as described in claim 1, characterized in that: An isolation layer (104) is fixedly connected to the side of the detection layer (103) away from the reinforcing layer (102), and the isolation layer (104) is made of ultra-high molecular weight polyethylene film.

3. A food packaging film that changes color according to temperature as described in claim 2, characterized in that: The isolation layer (104) is fixedly connected to a wear-resistant layer (105) on the side away from the detection layer (103), and the wear-resistant layer (105) is a polyamide film.

4. A food packaging film that changes color according to temperature as described in claim 3, characterized in that: A protective film (4) is fixedly connected to the surface of the food packaging film (1), and the protective film (4) is also made of transparent material.

5. A food packaging film that changes color according to temperature as described in claim 4, characterized in that: The food packaging film (1) has sealing strips (3) fixedly connected to both sides of its surface. The sealing strips (3) are divided into two parts.

6. A food packaging film that changes color according to temperature as described in claim 5, characterized in that: The food packaging film (1) has a tear-out opening (2) on its surface, and the tear-out opening (2) is arc-shaped.

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