Anti-corrosion disposable heat preservation sleeve and processing technology thereof

Abstract

The anti-corrosion disposable heat preservation sleeve comprises a heat preservation sleeve body, the heat preservation sleeve body sequentially comprises an outer-layer PET film, an aluminum oxide coating and an inner-layer PET film from outside to inside to form a three-layer composite structure, and an elastic closing opening is formed in the opening end of the heat preservation sleeve body; the outer PET film and the inner PET film are films formed by processing food-grade polyethylene glycol terephthalate, the thickness of the aluminum oxide coating is equal to that of the aluminum oxide coating, the reflection performance of light can be improved by compositing the PET films on the inner surface and the outer surface of the aluminum oxide coating, the surface of the aluminum oxide coating is brighter, and the service life of the aluminum oxide coating is prolonged. Therefore, the decorative effect and the visual attraction are improved. And a layer of PET film is compounded, so that the corrosion of water and corrosive substances can be effectively prevented, the aluminum oxide coating is prevented from being oxidized and damaged, and the service life of the aluminum oxide coating is prolonged. And in a cold environment, the normal use of the aluminum oxide coating under a low-temperature condition is ensured. And the adhesive force between the coating and the surface of the aluminum oxide coating can be enhanced.

Description

Technical Field

[0001] This invention relates to the field of food packaging insulation technology, specifically to a corrosion-resistant disposable insulation sleeve and its processing technology. Background Technology

[0002] With the rapid development of the food delivery industry and the increasing demand for food insulation, disposable insulation sleeves have become widely used as a convenient insulation tool. However, existing disposable insulation sleeves have many shortcomings and cannot meet actual usage needs.

[0003] Currently, the commonly available disposable thermal insulation sleeves on the market are mainly divided into two categories: one is made of ordinary plastic materials (such as PE and PP). Although these thermal insulation sleeves are low in cost, their thermal insulation effect is poor (relying solely on the heat insulation properties of the material itself, they cannot reflect heat radiation), and they are prone to deformation in humid environments. They also lack corrosion resistance, and long-term contact with high-temperature food may release harmful substances, posing a food safety hazard. The other category is single-layer aluminum-coated film thermal insulation sleeves, which improve the thermal insulation effect by reflecting heat radiation through the aluminum layer. However, the aluminum layer is directly exposed to the outside, and it is prone to oxidation when it comes into contact with water or humid air, generating loose aluminum oxide or aluminum hydroxide, which causes the coating to peel off and discolor. This not only results in the loss of thermal insulation function but may also contaminate food due to the migration of aluminum ions.

[0004] Among existing patent technologies, the invention patent with publication number CN107310220A discloses a PE / aluminum / PET film composite food packaging film and its preparation method. The preparation method includes: 1) mixing PET film, ABS, sodium bicarbonate, sodium gluconate, xylitol, ethylene glycol butyl ether, magnesium stearate, and titanium dioxide to obtain a first compound; 2) mixing PE (polyethylene), polyvinylpyrrolidone, nano-kaolin, calcium alginate, sodium carboxymethyl cellulose, and silica powder to obtain a second compound; 3) pretreating aluminum foil, then coating both sides of the aluminum foil with an adhesive, and finally hot-pressing and forming the first compound and the second compound onto both sides of the aluminum foil in sequence to obtain a heat-insulating PE / aluminum / PET film composite food packaging film; the adhesive is composed of starch, sodium silicate, polyvinyl acetate, sodium borate, magnesium sulfate, cellulose acetate, and water.

[0005] The composite food packaging film provided by the aforementioned patent primarily possesses excellent heat insulation properties. However, existing food packaging films cannot provide corrosion protection and are even unsuitable for contact with high-temperature foods, as they can easily release harmful substances upon contact. Therefore, developing a disposable heat-insulating sleeve that combines corrosion resistance, waterproofing, direct food contact capability, and high-efficiency heat insulation is crucial to overcoming the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide a corrosion-resistant disposable heat-insulating sleeve and its processing technology, which aims to improve the problems of existing food packaging films that cannot prevent corrosion, cannot come into contact with high-temperature food, and are prone to producing harmful substances when in contact with high-temperature food.

[0007] This invention is implemented as follows:

[0008] To achieve the above objectives, according to one aspect of the present invention, the present invention provides a corrosion-resistant disposable thermal insulation sleeve, comprising a thermal insulation sleeve body, wherein the thermal insulation sleeve body comprises, from the outside to the inside, an outer PET film, an aluminum oxide coating and an inner PET film, forming a three-layer composite structure, and the opening end of the thermal insulation sleeve body is provided with an elastic closure.

[0009] Preferably, both the outer and inner PET films are made of food-grade polyethylene terephthalate, and the thickness of the alumina coating is [missing information].

[0010] Preferably, the alumina coating is formed by evaporation oxidation reaction of high-purity aluminum wire, and the purity of the high-purity aluminum wire is not less than 99.9%.

[0011] Preferably, a protective coating is provided between the inner PET film and the alumina coating, and the protective coating is a food-grade water-based coating.

[0012] According to a second aspect of the present invention, a processing method for a corrosion-resistant disposable thermal insulation sleeve is provided, the specific steps of which are as follows:

[0013] S100. Load the roll-shaped outer PET film substrate onto the unwinding station of the vacuum evaporation machine, and then wind the outer PET film through the cooling rollers onto the winding station.

[0014] S200. Use a vacuum pump to evacuate the vapor deposition chamber of the vacuum vapor deposition machine, so that the vacuum degree inside the vapor deposition chamber reaches 4×10⁻⁶. 4 MBA or above;

[0015] S300, heating the evaporation boat of the vacuum evaporation machine, melts and evaporates high-purity aluminum wire into gaseous aluminum at high temperature, and at the same time opens the oxygen valve to introduce oxygen, so that the gaseous aluminum reacts with oxygen to produce aluminum oxide.

[0016] S400. Start the film winding system of the vacuum evaporation machine. When the outer PET film reaches the preset speed, open the baffle to allow gaseous alumina particles to be deposited and cooled on the moving outer PET film substrate to form an alumina coating.

[0017] S500: After applying a protective coating to the surface of the alumina coating, a composite inner PET film is formed to obtain the substrate for the corrosion-resistant disposable thermal insulation jacket.

[0018] Preferably, in step S100, the outer PET film is degreased and dried before the outer PET film substrate is mounted on the vacuum evaporation machine.

[0019] Preferably, in step S300, the purity of the high-purity aluminum wire is 99.99%, and the heating temperature of the high-purity aluminum wire is 1440-1460℃.

[0020] Preferably, in step S400, the thickness of the alumina coating is controlled by controlling the evaporation rate of the aluminum, the moving speed of the substrate film, and the oxygen content in the vapor deposition chamber.

[0021] Preferably, in step S500, the coating amount of the protective coating is 3-5 g / m². 2 After coating, pre-dry at 60-70℃ for 10-15 seconds.

[0022] Preferably, in step S500, after obtaining the substrate of the anti-corrosion disposable insulation sleeve, it is cut and heat-sealed, and then elastically closed to obtain the anti-corrosion disposable insulation sleeve.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. This invention improves light reflection properties by laminating a PET film onto both the inner and outer surfaces of the alumina coating, resulting in a brighter surface and enhanced decorative effect and visual appeal. The PET film effectively prevents erosion by moisture and corrosive substances, protecting the alumina coating from oxidation and damage, and extending its service life.

[0025] 2. This invention ensures the normal use of the alumina coating under low-temperature conditions in cold environments.

[0026] 3. This invention can enhance the adhesion between the coating and the surface of the alumina coating, prevent the coating from peeling off, and improve the quality and reliability of the product. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the insulation sleeve of the present invention;

[0028] Figure 2 This is a schematic diagram of the layered structure of the thermal insulation sleeve of the present invention;

[0029] Figure 3 This is a flowchart of the processing technology of the present invention.

[0030] In the picture: 1. Insulation sleeve body; 2. Elastic closure; 3. Outer PET film; 4. Alumina coating; 5. Inner PET film. Detailed Implementation

[0031] In this invention, 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 part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, a corrosion-resistant disposable heat-insulating sleeve includes a sleeve body 1. The sleeve body 1 comprises, from the outside to the inside, an outer PET film 3, an alumina coating 4, and an inner PET film 5, forming a three-layer composite structure. The outer PET film 3 possesses mechanical strength and protects the intermediate coating; it is formed through the oxidation reaction of aluminum and serves to reflect heat radiation and block moisture. The inner PET film 5 directly contacts food, is non-toxic and heat-resistant, and protects the alumina coating 4 from damage. Furthermore, the opening end of the sleeve body 1 has an elastic closure 2, facilitating a stable fit of the sleeve onto food containers. Both the outer PET film 3 and the inner PET film 5 are made of food-grade polyethylene terephthalate. The thickness of the alumina coating 4 is [not specified]. This improves the overall insulation performance of the insulation jacket. The alumina coating 4 is formed by the evaporation and oxidation reaction of high-purity aluminum wire, with a purity of not less than 99.9%. A protective coating, which is a food-grade water-based coating, is provided between the inner PET film 5 and the alumina coating 4 to prevent leakage when the inner PET film 5 comes into contact with food.

[0035] Example 2

[0036] like Figure 1 and Figure 2As shown, a corrosion-resistant disposable heat-insulating sleeve includes a sleeve body 1. The sleeve body 1 comprises, from the outside to the inside, an outer PET film 3, an alumina coating 4, and an inner PET film 5, forming a three-layer composite structure. The outer PET film 3 possesses mechanical strength and protects the intermediate coating; it is formed through the oxidation reaction of aluminum and serves to reflect heat radiation and block moisture. The inner PET film 5 directly contacts food, is non-toxic and heat-resistant, and protects the alumina coating 4 from damage. Furthermore, the opening end of the sleeve body 1 has an elastic closure 2, facilitating a stable fit of the sleeve onto food containers. Both the outer PET film 3 and the inner PET film 5 are made of food-grade polyethylene terephthalate. The thickness of the alumina coating 4 is [not specified]. This improves the overall insulation performance of the insulation jacket. The alumina coating 4 is formed by the evaporation and oxidation reaction of high-purity aluminum wire, with a purity of not less than 99.9%. A protective coating, which is a food-grade water-based coating, is provided between the inner PET film 5 and the alumina coating 4 to prevent leakage when the inner PET film 5 comes into contact with food.

[0037] Example 3

[0038] like Figure 1 and Figure 2 As shown, a corrosion-resistant disposable heat-insulating sleeve includes a sleeve body 1. The sleeve body 1 comprises, from the outside to the inside, an outer PET film 3, an alumina coating 4, and an inner PET film 5, forming a three-layer composite structure. The outer PET film 3 possesses mechanical strength and protects the intermediate coating; it is formed through the oxidation reaction of aluminum and serves to reflect heat radiation and block moisture. The inner PET film 5 directly contacts food, is non-toxic and heat-resistant, and protects the alumina coating 4 from damage. Furthermore, the opening end of the sleeve body 1 has an elastic closure 2, facilitating a stable fit of the sleeve onto food containers. Both the outer PET film 3 and the inner PET film 5 are made of food-grade polyethylene terephthalate. The thickness of the alumina coating 4 is [not specified]. This improves the overall insulation performance of the insulation jacket. The alumina coating 4 is formed by the evaporation and oxidation reaction of high-purity aluminum wire, with a purity of not less than 99.9%. A protective coating, which is a food-grade water-based coating, is provided between the inner PET film 5 and the alumina coating 4 to prevent leakage when the inner PET film 5 comes into contact with food.

[0039] Example 4

[0040] like Figure 3 As shown, a processing technology for a corrosion-resistant disposable thermal insulation sleeve is described, and the specific steps of this processing technology are as follows:

[0041] S100. Before loading the outer PET film 3 substrate into the vacuum evaporation machine, the outer PET film 3 should be degreased and dried (temperature 60℃, time 30min) to remove surface oil and moisture. Then, the roll-shaped outer PET film 3 substrate is loaded onto the unwinding station of the vacuum evaporation machine, and the outer PET film 3 is passed through the cooling roller and wound onto the take-up station.

[0042] S200. Use a vacuum pump to evacuate the vapor deposition chamber of the vacuum vapor deposition machine, so that the vacuum degree inside the vapor deposition chamber reaches 4×10⁻⁶. 4 MBA or above;

[0043] The S300 heating vacuum evaporation machine's evaporation boat melts and evaporates high-purity aluminum wire into gaseous aluminum at high temperature. At the same time, the oxygen valve is opened to introduce oxygen, causing the gaseous aluminum to react with oxygen to form aluminum oxide. The high-purity aluminum wire has a purity of 99.99% and is heated at 1440℃.

[0044] S400. Start the film winding system of the vacuum evaporation machine. When the outer PET film 3 reaches the preset speed, open the baffle to allow gaseous alumina particles to deposit and cool on the moving outer PET film 3 substrate surface, forming an alumina coating 4. By controlling the evaporation rate of metallic aluminum, the moving speed of the substrate film, and the oxygen content in the evaporation chamber, the thickness of the alumina coating 4 is controlled to be...

[0045] S500: After applying a protective coating to the surface of the alumina coating 4, a PET film 5 is laminated onto it to obtain the substrate for the corrosion-resistant disposable thermal insulation sleeve. The coating amount of the protective coating is 3 g / m². 2 After coating, the film is pre-dried at 60℃ for 10s. After drying, the inner PET film 5 with a thickness of 8μm is laminated with the coated alumina layer 4 through a composite roller (pressure 0.3MPa, temperature 40℃), forming a three-layer composite film with the outer PET film 3. After obtaining the substrate of the anti-corrosion disposable insulation sleeve, it is cut and heat-sealed (temperature 160℃, time 1s), and then processed with elastic sealing 2 to obtain the anti-corrosion disposable insulation sleeve.

[0046] Example 5

[0047] like Figure 3 As shown, a processing technology for a corrosion-resistant disposable thermal insulation sleeve is described, and the specific steps of this processing technology are as follows:

[0048] S100. Before loading the outer PET film 3 substrate into the vacuum evaporation machine, the outer PET film 3 should be degreased and dried (temperature 65℃, time 35min) to remove surface oil and moisture. Then, the roll-shaped outer PET film 3 substrate is loaded onto the unwinding station of the vacuum evaporation machine, and the outer PET film 3 is passed through the cooling roller and wound onto the take-up station.

[0049] S200. Use a vacuum pump to evacuate the vapor deposition chamber of the vacuum vapor deposition machine, so that the vacuum degree inside the vapor deposition chamber reaches 4×10⁻⁶. 4 MBA or above;

[0050] The S300 heating vacuum evaporation machine's evaporation boat melts and evaporates high-purity aluminum wire into gaseous aluminum at high temperature. At the same time, the oxygen valve is opened to introduce oxygen, causing the gaseous aluminum to react with oxygen to form aluminum oxide. The high-purity aluminum wire has a purity of 99.99% and is heated at 1450℃.

[0051] S400. Start the film winding system of the vacuum evaporation machine. When the outer PET film 3 reaches the preset speed, open the baffle to allow gaseous alumina particles to deposit and cool on the moving outer PET film 3 substrate surface, forming an alumina coating 4. By controlling the evaporation rate of metallic aluminum, the moving speed of the substrate film, and the oxygen content in the evaporation chamber, the thickness of the alumina coating 4 is controlled to be...

[0052] S500: After applying a protective coating to the surface of the alumina coating 4, a PET film 5 is laminated onto it to obtain the substrate for the corrosion-resistant disposable thermal insulation sleeve. The coating amount of the protective coating is 4 g / m². 2 After coating, the film is pre-dried at 65℃ for 12.5s. After drying, the inner PET film 5 with a thickness of 8-12μm is laminated with the coated alumina layer 4 through a composite roller (pressure 0.4MPa, temperature 45℃) to form a three-layer composite film with the outer PET film 3. After obtaining the substrate of the anti-corrosion disposable insulation sleeve, it is cut and heat-sealed (temperature 170℃, time 1.5s), and then processed with elastic sealing 2 to obtain the anti-corrosion disposable insulation sleeve.

[0053] Example 6

[0054] like Figure 3 As shown, a processing technology for a corrosion-resistant disposable thermal insulation sleeve is described, and the specific steps of this processing technology are as follows:

[0055] S100. Before loading the outer PET film 3 substrate into the vacuum evaporation machine, the outer PET film 3 should be degreased and dried (temperature 70℃, time 40min) to remove surface oil and moisture. Then, the roll-shaped outer PET film 3 substrate is loaded onto the unwinding station of the vacuum evaporation machine, and the outer PET film 3 is passed through the cooling roller and wound onto the rewinding station.

[0056] S200. Use a vacuum pump to evacuate the vapor deposition chamber of the vacuum vapor deposition machine, so that the vacuum degree inside the vapor deposition chamber reaches 4×10⁻⁶. 4 MBA or above;

[0057] The S300 heating vacuum evaporation machine's evaporation boat melts and evaporates high-purity aluminum wire into gaseous aluminum at high temperature. At the same time, the oxygen valve is opened to introduce oxygen, causing the gaseous aluminum to react with oxygen to form aluminum oxide. The high-purity aluminum wire has a purity of 99.99% and is heated at 1460℃.

[0058] S400. Start the film winding system of the vacuum evaporation machine. When the outer PET film 3 reaches the preset speed, open the baffle to allow gaseous alumina particles to deposit and cool on the moving outer PET film 3 substrate surface, forming an alumina coating 4. By controlling the evaporation rate of metallic aluminum, the moving speed of the substrate film, and the oxygen content in the evaporation chamber, the thickness of the alumina coating 4 is controlled to be...

[0059] S500: After applying a protective coating to the surface of the alumina coating 4, a PET film 5 is laminated onto the inner layer to obtain the substrate for the corrosion-resistant disposable thermal insulation sleeve. The coating amount of the protective coating is 5 g / m². 2 After coating, the film is pre-dried at 70℃ for 15s. After drying, the 12μm thick inner PET film 5 is laminated with the coated alumina layer 4 through a composite roller (pressure 0.5MPa, temperature 50℃), forming a three-layer composite film with the outer PET film 3. After obtaining the substrate of the anti-corrosion disposable insulation sleeve, it is cut and heat-sealed (temperature 180℃, time 2s), and then processed with elastic sealing 2 to obtain the anti-corrosion disposable insulation sleeve.

[0060] Working Principle: This corrosion-resistant disposable thermal insulation jacket is based on its three-layer composite structure and the synergistic effect of its components. The outer PET film 3 is made of food-grade polyethylene terephthalate, possessing good mechanical strength and protecting the intermediate alumina coating 4 from external physical damage. The alumina coating 4 is formed by an evaporation oxidation reaction of high-purity aluminum wire with a purity of not less than 99.9%, and its thickness is [missing information]. It reduces heat loss by reflecting thermal radiation and effectively blocks moisture, preventing external humidity from affecting the insulation effect. The inner PET film 5 is also made of food-grade polyethylene terephthalate, which is in direct contact with food, non-toxic, and heat-resistant. This ensures safety and protects the alumina coating 4 from direct food corrosion. The food-grade water-based protective coating between the inner PET film 5 and the alumina coating 4 further prevents leakage and ensures structural stability. In addition, the elastic taper 2 at the opening of the insulation sleeve body 1 allows it to fit stably on the food container, reducing heat exchange at gaps, thus achieving good overall insulation and corrosion protection.

[0061] In summary, compared with existing technologies, this application improves light reflection properties by laminating a PET film onto the surface of the alumina coating, resulting in a brighter surface and enhanced decorative effect and visual appeal. The PET film effectively prevents erosion by moisture and corrosive substances, protecting the alumina coating from oxidation and damage, thus extending its service life. In cold environments, it ensures the normal operation of the alumina coating under low-temperature conditions. Furthermore, it strengthens the adhesion between the coating and the alumina surface, preventing coating peeling and improving product quality and reliability.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A corrosion-resistant disposable thermal insulation sleeve, comprising a thermal insulation sleeve body (1), characterized in that, The insulation sleeve body (1) consists of an outer PET film (3), an aluminum oxide coating (4), and an inner PET film (5) from the outside to the inside, forming a three-layer composite structure. The insulation sleeve body (1) has an elastic closure (2) at the open end.

2. The corrosion-resistant disposable thermal insulation sleeve according to claim 1, characterized in that, Both the outer PET film (3) and the inner PET film (5) are made of food-grade polyethylene terephthalate, and the thickness of the alumina coating (4) is [missing information].

3. The corrosion-resistant disposable thermal insulation sleeve according to claim 1, characterized in that, The alumina coating (4) is formed by evaporation oxidation reaction of high-purity aluminum wire, and the purity of the high-purity aluminum wire is not less than 99.9%.

4. The corrosion-resistant disposable thermal insulation sleeve according to claim 1, characterized in that, A protective coating is provided between the inner PET film (5) and the alumina coating (4), and the protective coating is a food-grade water-based coating.

5. A processing method for a corrosion-resistant disposable thermal insulation sleeve, used to process the disposable thermal insulation sleeve according to any one of claims 1-5, characterized in that, The specific steps of this processing technique are as follows: S100. The outer PET film (3) substrate in roll shape is placed on the unwinding station of the vacuum evaporation machine, and the outer PET film (3) is passed through the cooling roller and then wound on the winding station. S200. Use a vacuum pump to evacuate the vapor deposition chamber of the vacuum vapor deposition machine, so that the vacuum degree inside the vapor deposition chamber reaches 4×10⁻⁶. 4 MBA or above; S300, heating the evaporation boat of the vacuum evaporation machine, melts and evaporates high-purity aluminum wire into gaseous aluminum at high temperature, and at the same time opens the oxygen valve to introduce oxygen, so that the gaseous aluminum reacts with oxygen to produce aluminum oxide. S400, Start the film winding system of the vacuum evaporation machine. When the running speed of the outer PET film (3) reaches the preset value, open the baffle to allow gaseous alumina particles to be deposited and cooled on the surface of the moving outer PET film (3) substrate to form an alumina coating (4). S500. After applying a protective coating to the surface of the alumina coating (4), a composite inner PET film (5) is formed to obtain the substrate of the corrosion-resistant disposable thermal insulation jacket.

6. The processing technology of the corrosion-resistant disposable thermal insulation sleeve according to claim 5, characterized in that, In step S100, the outer PET film (3) substrate is degreased and dried before being mounted on the vacuum evaporation machine.

7. The processing technology of the corrosion-resistant disposable thermal insulation sleeve according to claim 5, characterized in that, In step S300, the purity of the high-purity aluminum wire is 99.99%, and the heating temperature of the high-purity aluminum wire is 1440-1460℃.

8. The processing technology of a corrosion-resistant disposable thermal insulation sleeve according to claim 5, characterized in that, In step S400, the thickness of the alumina coating (4) is controlled by controlling the evaporation rate of the aluminum, the moving speed of the substrate film, and the amount of oxygen in the vapor deposition chamber.

9. The processing technology of a corrosion-resistant disposable thermal insulation sleeve according to claim 5, characterized in that, In step S500, the coating amount of the protective coating is 3-5 g / m². 2 After coating, pre-dry at 60-70℃ for 10-15 seconds.

10. The processing technology of a corrosion-resistant disposable thermal insulation sleeve according to claim 5, characterized in that, In step S500, after obtaining the substrate of the anti-corrosion disposable insulation sleeve, it is cut and heat-sealed, and then elastically closed (2) is performed to obtain the anti-corrosion disposable insulation sleeve.

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