Packaging method for hot pot base prepared by low-temperature oil extraction technology

Abstract

The present invention discloses a packaging method for hot pot base prepared using low-temperature oil extraction technology, which belongs to the field of food production and includes the following steps: S1, using a circular packaging box with a glue groove on the top as packaging material, the packaging box including an outer cylinder, an inner cylinder installed inside the outer cylinder, a horizontally placed annular partition installed between the outer cylinder and the inner cylinder, and a sealing layer provided above the outer cylinder; S2, preparing an adhesive containing ferrous hydroxide powder, and filling the glue groove on the top of the packaging box with the adhesive containing ferrous hydroxide powder; S3, when the glue groove on the top of the packaging box is filled with the adhesive containing ferrous hydroxide powder, pressing the sealing layer on the top of the packaging box against the top of the packaging box, and after the adhesive containing ferrous hydroxide powder is cured, the sealing layer is sealed to the top of the packaging box. The present invention solves the problem that the packaging structure used in the existing packaging method for hot pot base does not provide a warning function for its sealing, and air leakage in the packaging structure cannot be detected in time.

Description

Technical Field

[0001] The invention belongs to the field of food and relates to a packaging method for hot pot base prepared by low-temperature oil extraction technology. Background Art

[0002] The main method of preparing hot pot base with low-temperature oil extraction technology is: by low-temperature extraction of fried spices with butter, the aroma is integrated into the oil, the bioactive substances of various seasonings are retained, and the taste and aroma are richer.

[0003] The hot pot base prepared by low-temperature oil extraction technology has a rich aroma. However, since the hot pot base prepared by low-temperature oil extraction technology contains a large amount of active substances, the storage requirements of this type of hot pot base are very high. Once this type of hot pot base is not sealed or leaks during storage, this type of hot pot base will deteriorate in a very short time compared to the hot pot base prepared by conventional high-temperature frying.

[0004] The packaging structure used in the existing hot pot base packaging method has no warning effect on its sealing. When tiny gaps that are difficult to see with the naked eye appear in the sealing layer of the packaging structure, the leakage of the packaging structure is difficult to be discovered in a short period of time. The hot pot base prepared by low-temperature oil extraction technology will undergo irreversible deterioration in a short period of time, resulting in food waste. Summary of the Invention

[0005] The purpose of the present invention is to provide a packaging method for hot pot base prepared by low-temperature oil extraction technology, which solves the problem that the packaging structure used in the existing packaging method of hot pot base has no indication effect on its sealing and cannot timely detect air leakage in the packaging structure.

[0006] The technical solution adopted in the present invention is as follows:

[0007] The packaging method of hot pot base prepared by low-temperature oil extraction technology comprises the following steps:

[0008] S1. A circular packaging box with a glue groove on the top is used as the packaging material. The circular packaging box with a glue groove on the top comprises a vertically placed outer cylinder, a coaxial inner cylinder of the same height installed inside the outer cylinder, a horizontally placed annular partition installed between the outer cylinder and the inner cylinder, the annular partition being located below the top surfaces of the outer cylinder and the inner cylinder. The outer cylinder, the inner cylinder, and the annular partition form an annular glue groove with an open top. A sealing layer is provided above the outer cylinder to seal the top openings of the outer cylinder and the inner cylinder. A block of hot pot base prepared by low-temperature oil extraction technology is placed inside the inner cylinder, and the portion of the sealing layer corresponding to the glue groove is made of a transparent material;

[0009] S2. Prepare an adhesive containing ferrous hydroxide powder and fill the adhesive groove at the top of the packaging box with the adhesive containing ferrous hydroxide powder;

[0010] S3. When the glue groove on the top of the packaging box is filled with adhesive containing ferrous hydroxide powder, press the sealing layer on the top of the packaging box tightly against the top of the packaging box. After the adhesive containing ferrous hydroxide powder solidifies, the sealing layer is sealed and connected to the top of the packaging box. Once a gap is formed between the sealing layer and the top of the packaging box, the color of the adhesive inside the glue groove will change significantly.

[0011] The present invention changes the packaging structure used in the hot pot base packaging method. The new packaging structure provides a glue groove. Based on this structure, the present invention designs an adhesive that changes color upon contact with air. Once the packaging structure leaks, the adhesive changes color within a short period of time, providing a leak warning function. The present invention designs a new packaging structure that can be used in conjunction with the color-changing adhesive. The new packaging structure and the color-changing adhesive form a packaging method for hot pot base that is different from the existing technology. The finished hot pot base packaged by this new packaging method has a leak warning function, which solves the problem that the packaging structure used in the existing hot pot base packaging method does not provide a warning function for the sealing of the packaging structure, making it impossible to promptly detect leaks in the packaging structure.

[0012] The outer tube and the inner tube in the present invention are the main structure of the packaging box, and the double-layer hollow structure has good heat insulation and protection performance. On the one hand, compared with the existing single-layer plastic structure, the double-layer hollow cylindrical structure of the present invention has good wear resistance and puncture resistance, is not easily damaged during transportation and storage, and has good protection performance; on the other hand, the double-layer hollow structure has a good heat insulation effect, which prevents the hot pot base material inside the inner tube from melting due to the external high temperature. The base material in the solidified state can effectively lock the moisture and seasoning therein, avoid the evaporation and oxidation of moisture, and maintain the freshness and taste of the base material; the sealing layer and the packaging structure in the hot pot base material packaging structure are The connection between the main bodies is most likely to debond and crack. Therefore, the present invention mainly provides a leakage warning at the connection between the sealing layer and the main body of the packaging structure, while changing the main body of the packaging structure. The main component of the adhesive of the present invention that plays the role of leakage warning is ferrous hydroxide powder. Ferrous hydroxide is an inorganic substance with the chemical formula Fe(OH)2, a relative molecular mass of 89.866, a white solid, insoluble in water, and easily oxidized. Fe(OH)2 will be rapidly oxidized in the air, starting to turn gray-green and finally turning into brown-red iron hydroxide; the principle equation for the oxidation of Fe(OH)2 is:

[0013] 4Fe(OH)2+O2+2H2O=4Fe(OH)3.

[0014] The adhesive in the present invention is used to bond the sealing layer and the top opening of the packaging structure. When the adhesive fills the glue groove, the air inside the glue groove will be discharged, and then the sealing layer will be quickly used to seal it. At this time, a relatively sealed and oxygen-free environment is formed between the sealing layer and the glue groove. The adhesive will not come into contact with oxygen in the glue groove and will not be oxidized, and will always remain in a white state; when the sealing layer debonds and cracks appear, no matter the size of the cracks, as long as there are cracks, air will continue to enter the glue groove from the gaps. There is a large amount of oxygen and moisture in the air, and the ferrous hydroxide in the adhesive will be rapidly oxidized, turning from white to gray-green and finally to brown-red. Gray-green and brown-red are both very obvious colors and have a significant warning effect. There is no need to conduct a comprehensive inspection of the sealing layer. As long as gray-green or brown-red appears in the glue groove, it means that the sealing layer has debonded and cracked, which is convenient for inspectors to reseal the packaging structure in a short time, that is, before the hot pot base deteriorates.

[0015] Furthermore, the adhesive with ferrous hydroxide powder includes the following components in parts by weight: 70-80 parts of epoxy resin, 3-4 parts of silicone resin, 20-25 parts of quartz powder, 5-8 parts of curing accelerator, 10-15 parts of cross-linking agent, and ferrous hydroxide powder. The mass of the ferrous hydroxide powder accounts for 7-9% of the total mass of the epoxy resin, silicone resin, quartz powder, curing accelerator, and cross-linking agent.

[0016] The present invention uses epoxy resin and silicone resin as the adhesive component of adhesive, mainly epoxy resin and silicone resin have stable chemical properties and will not react with ferrous hydroxide. In addition, epoxy resin and silicone resin have very excellent durability and oxidation resistance. Using epoxy resin and silicone resin as the matrix to mix ferrous hydroxide powder can keep ferrous hydroxide performance stable in a short time; Compared with other polymers, silicone resin has many advantages, such as wide temperature range, good aging resistance, good moisture resistance, etc., but the curing speed of silicone is slow. The present invention adds a small amount of silicone resin in adhesive, combines the use of curing accelerator, while ensuring that the adhesive of the present invention cures quickly, effectively improves the comprehensive performance of adhesive. The adhesive component of the adhesive obtained by the present invention with epoxy resin and silicone resin is the preferred embodiment of the present invention. In addition to epoxy resin, other chemically stable and transparent resins, such as polyamide resin, fully polymerized acrylic resin, etc., can also be used. The present invention combines food safety, takes the toxicity of adhesive into consideration, and preferably epoxy resin and silicone resin. In the present invention, quartz powder is added to the adhesive. The quartz powder can increase the viscosity of the adhesive, making it stronger and more reliable. However, the amount of quartz powder added should not be too much, otherwise the adhesive will be too dense. If the adhesive is too dense, the pores will be small after curing, and it will be difficult for air to enter the adhesive and react with ferrous hydroxide. Therefore, the present invention ensures that the ferrous hydroxide can fully contact with air and change color while ensuring that the adhesive has strong adhesion.

[0017] In the present invention, the amount of ferrous hydroxide powder added is most important, and the amount of ferrous hydroxide powder added needs to be adjusted according to the total mass of other components; if the amount of ferrous hydroxide added is too little, the ferrous hydroxide will be wrapped by the resin, and when air enters the glue tank, the air needs to pass through the pores of the cured resin before it can contact the ferrous hydroxide, the ferrous hydroxide oxidizes slowly, and a large amount of oxygen is required for an oxidation reaction to occur, and a long time is required for the packaging structure to leak and the adhesive to change color, so the warning of the packaging structure leakage is not timely and the warning effect is not significant; if the amount of ferrous hydroxide added is too much, the chemical properties of the ferrous hydroxide are unstable, which will cause the chemical properties of the entire adhesive to be unstable. When the adhesive is prepared and used immediately, the ferrous hydroxide in the adhesive will be oxidized during the process of injecting the adhesive into the glue tank, causing the adhesive to change color prematurely and cannot be used further; the present invention optimizes the proportions of the various components, and while ensuring that the adhesive has a significant leakage warning effect, the obtained adhesive has excellent comprehensive properties such as adhesion, oxidation resistance, and heat resistance.

[0018] Furthermore, the adhesive with ferrous hydroxide powder includes the following components in parts by weight: 80 parts of epoxy resin, 3 parts of silicone resin, 25 parts of quartz powder, 8 parts of curing accelerator, 15 parts of cross-linking agent, and ferrous hydroxide powder, and the mass of the ferrous hydroxide powder accounts for 9% of the total mass of the epoxy resin, silicone resin, quartz powder, curing accelerator, and cross-linking agent.

[0019] The present invention optimizes the optimal ratio, and the obtained adhesive has the best use effect.

[0020] Furthermore, in step S2, the adhesive containing ferrous hydroxide powder is prepared and used immediately. The preparation method of the adhesive containing ferrous hydroxide powder includes the following steps:

[0021] A. Stir and mix liquid epoxy resin and liquid silicone resin at 100-120°C, continue stirring for 20-30 minutes, then add crosslinking agent, continue stirring and heating for 1-2 hours to obtain liquid mixed resin;

[0022] B. Add quartz powder to the liquid mixed resin in step A at 50-60°C, stir for 30 minutes, then add a curing accelerator, continue stirring for 30 minutes, and then keep static at 50-6°C for 3-4 hours to obtain a resin adhesive;

[0023] C. Add ferrous hydroxide powder to the resin adhesive in B at 40-45°C and stir at high speed for 3-5 minutes until evenly mixed to obtain a white adhesive with ferrous hydroxide powder.

[0024] The present invention successfully prepares an adhesive with ferrous hydroxide powder having superior performance.

[0025] Furthermore, an annular enclosure is provided inside the inner tube, and the enclosure is connected and fixed to the tube wall of the inner tube by an annular connecting plate. The top surface of the annular connecting plate is located lower than the top surface of the enclosure and the inner tube. The tube wall of the inner tube, the annular connecting plate and the enclosure form a groove with an opening at the top, and the groove is a glue overflow groove, which is located on the inner side of the glue groove.

[0026] The present invention is provided with a glue overflow groove, and adhesive is injected into the glue groove until a small amount of adhesive overflows into the glue overflow groove, which indicates that the glue groove is full of adhesive. The setting of the glue overflow groove is to ensure that the inside of the glue groove can be filled with adhesive and then discharge the air in the glue groove; in addition, during the sealing process, when the sealing layer is pressed against the glue groove, a small amount of adhesive in the glue groove will be squeezed out. The glue overflow groove can prevent the adhesive overflowing from the glue groove from falling on the hot pot base located inside the inner cylinder.

[0027] Furthermore, the sealing layer includes an inner layer, an interlayer, an outer layer and a light-shielding layer. The inner layer is a polyethylene transparent film, the interlayer is a flexible transparent nano-coating, and the outer layer is a polypropylene transparent film. The inner layer, the interlayer and the outer layer are bonded together in sequence. The light-shielding layer is arranged on the outer surface of the outer layer, the interlayer is bonded to the inner surface of the outer layer, and the inner surface of the inner layer is sealed with the top of the packaging box. The area of ​​the light-shielding layer is smaller than that of the outer layer, and the glue groove is located outside the area covered by the light-shielding layer.

[0028] The present invention provides a sealing layer with a three-layer structure, and the three-layer structure is made of transparent materials, which is convenient for observing the discoloration of the adhesive inside the glue groove; the inner layer is a polyethylene transparent film, which is non-toxic, waterproof, can withstand large tensile force and pressure, and has good wear resistance and tear resistance. The polyethylene film is directly in contact with the inner cylinder and the top of the outer cylinder as the inner layer, and needs to have good pressure resistance and wear resistance, otherwise the inner film is easily damaged; the outer layer is a polypropylene transparent film, which is transparent, light, has good heat resistance, acid and alkali resistance, oil resistance, moisture-proof and waterproof functions, and the outer film is directly in contact with the inner cylinder and the top of the outer cylinder. It .... In contact with the complex external environment, higher comprehensive performance requirements such as heat resistance, acid and alkali resistance, oil resistance, and water resistance are required. Therefore, the present invention preferably uses polypropylene film as the outer layer structure of the sealing layer; a nano-coating is provided between the inner layer and the outer layer structure of the present invention. In addition to being hydrophobic and oleophobic, the nano-coating has acid, alkali, and corrosion resistance. In addition, the excellent sealing performance of the nano-coating can effectively prevent liquid leakage and gas leakage. Using the nano-coating as an interlayer can effectively enhance the sealing performance of the sealing layer, and the present invention places the nano-coating in the middle layer to avoid long-term exposure of the nano-coating to the environment affecting its service life.

[0029] Furthermore, the curing accelerator is tetrabutylammonium bromide anhydride curing accelerator.

[0030] Tetrabutylammonium bromide anhydride curing accelerator is an inorganic compound with the chemical formula (CH3)4NBr. It is a colorless crystal, non-toxic and safe, with a high curing speed, which can significantly increase the curing speed of the adhesive.

[0031] Furthermore, the packaging method of the hot pot base prepared by the low-temperature oil extraction technology further includes step S4, testing the sealing performance of the packaging box sealed in step S3. The specific steps are as follows:

[0032] a. Place the package containing the hot pot base after sealing in step S3 in a high oxygen and high humidity environment with an oxygen content of 50% and a relative humidity of 95% for 24 hours;

[0033] b. In step a, the packaging box is placed in a high-oxygen and high-humidity environment for 24 hours, and an image acquisition device is used to capture the color of the adhesive at the location of the adhesive groove of the packaging box in real time. The image acquisition device transmits the captured image to a host computer, and the host computer extracts the color of the adhesive at the location of the adhesive groove of the packaging box from the image;

[0034] Within 24 hours, when the host computer monitors the color change of the adhesive, it will issue an alarm, warning that the packaging box is not completely sealed and there is a leak point;

[0035] If the host computer does not give an alarm within 24 hours, it means that the packaging box is completely sealed and the packaging box sealing performance test is completed.

[0036] After the hot pot base is packaged, the present invention eliminates the need for the current manual inspection method for sealing performance testing of the packaging structure. Instead, the present invention utilizes an image acquisition device and a host computer to capture color changes of the adhesive inside the glue groove of the packaging box in real time in an environment of high oxygen and high humidity where ferrous hydroxide is easily oxidized. Compared with manual inspection, the inspection method of the present invention provides more accurate inspection results. A large number of packaging boxes can be placed in the same high oxygen and high humidity environment. As long as there are a sufficient number of image acquisition devices, performance inspections can be performed on a large number of packaging boxes at the same time.

[0037] Furthermore, the thickness of the sealing layer is 0.125-0.15 mm.

[0038] If the sealing layer is too thick, a high pressure is required to ensure a tight fit between the sealing layer and the top of the packaging box during sealing. The thicker the sealing layer, the less likely it is to deform, resulting in poor sealing performance after sealing. If the sealing layer is too thin, it is easily damaged during use, resulting in poor protective and sealing performance. Therefore, the present invention optimizes the sealing layer thickness that optimizes sealing performance.

[0039] Furthermore, the outer wall of the outer cylinder is covered with a light-shielding and heat-insulating film.

[0040] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0041] 1. The present invention's packaging method for hot pot base prepared using low-temperature oil extraction technology changes the packaging structure used in hot pot base packaging methods. The new packaging structure provides an adhesive groove. Based on this structure, the present invention designs an adhesive that changes color upon contact with air. Once the packaging structure leaks, the adhesive changes color within a short period of time, providing a leak warning function.

[0042] 2. The packaging method for hot pot soup base prepared using low-temperature oil extraction technology of the present invention eliminates the current manual inspection method for sealing performance testing of the packaging structure after packaging the hot pot soup base. In an environment of high oxygen and humidity where ferrous hydroxide is easily oxidized, the present invention utilizes an image acquisition device and a host computer to capture the color changes of the adhesive inside the glue groove of the packaging box in real time. Compared with manual inspection, the inspection method of the present invention provides more accurate inspection results.

[0043] 3. The packaging method of the hot pot base prepared by the low-temperature oil extraction technology of the present invention is provided with a sealing layer having a three-layer structure. The sealing layer has excellent sealing performance and comprehensive properties such as waterproof, anti-fouling, pressure resistance, and wear resistance;

[0044] 4. The packaging method of the hot pot base prepared by the low-temperature oil extraction technology of the present invention optimizes the ratio of each component in the adhesive. While ensuring that the adhesive has a significant leakage warning effect, the obtained adhesive has excellent comprehensive properties such as adhesion, antioxidant, and heat resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort, among which:

[0046] Figure 1 It is a structural schematic diagram of the packaging box of the present invention;

[0047] Figure 2 It is a schematic diagram of the inner tube structure of the packaging box of the present invention;

[0048] Figure 3 Schematic diagram of the sealing layer structure of the present invention.

[0049] Markings in the figure: 1-outer tube, 2-inner tube, 3-annular partition, 4-sealing layer, 5-enclosure, 6-annular connecting plate, 41-inner layer, 42-interlayer, 43-outer layer. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0052] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0053] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0054] Example 1

[0055] Combine Figure 1-Figure 3 As shown, the packaging method of the hot pot base prepared by low-temperature oil extraction technology comprises the following steps:

[0056] S1. A circular packaging box with a glue groove on the top is used as packaging material. The circular packaging box with a glue groove on the top comprises a vertically placed outer cylinder 1, a coaxial inner cylinder 2 of the same height installed inside the outer cylinder 1, a horizontally placed annular partition 3 installed between the outer cylinder 1 and the inner cylinder 2, and the annular partition 3 is located below the top surfaces of the outer cylinder 1 and the inner cylinder 2. The outer cylinder 1, the inner cylinder 2, and the annular partition 3 form an annular glue groove with an open top. A sealing layer 4 is provided above the outer cylinder 1 to seal the top openings of the outer cylinder 1 and the inner cylinder 2. The hot pot base prepared by low-temperature oil extraction technology in block form is placed inside the inner cylinder 2. The portion of the sealing layer 4 corresponding to the glue groove is made of transparent material; the outer wall of the outer cylinder 1 is covered with a light-shielding and heat-insulating film;

[0057] S2. Prepare an adhesive containing ferrous hydroxide powder and fill the adhesive groove at the top of the packaging box with the adhesive containing ferrous hydroxide powder;

[0058] S3. When the adhesive groove at the top of the packaging box is filled with the adhesive containing ferrous hydroxide powder, the sealing layer 4 at the top of the packaging box is pressed tightly against the top of the packaging box. After the adhesive containing ferrous hydroxide powder solidifies, the sealing layer 4 is sealed to the top of the packaging box. Once a gap is formed between the sealing layer 4 and the top of the packaging box, the color of the adhesive inside the adhesive groove will change significantly.

[0059] S4. Perform a sealing performance test on the package box sealed in step S3. The specific steps are as follows:

[0060] a. Place the package containing the hot pot base after sealing in step S3 in a high oxygen and high humidity environment with an oxygen content of 50% and a relative humidity of 95% for 24 hours;

[0061] b. In step a, the packaging box is placed in a high-oxygen and high-humidity environment for 24 hours, and an image acquisition device is used to capture the color of the adhesive at the location of the adhesive groove of the packaging box in real time. The image acquisition device transmits the captured image to a host computer, and the host computer extracts the color of the adhesive at the location of the adhesive groove of the packaging box from the image;

[0062] Within 24 hours, when the host computer monitors the color change of the adhesive, it will issue an alarm, warning that the packaging box is not completely sealed and there is a leak point;

[0063] If the host computer does not give an alarm within 24 hours, it means that the packaging box is completely sealed and the packaging box sealing performance test is completed.

[0064] The adhesive with ferrous hydroxide powder comprises the following components in parts by weight: 70 parts of epoxy resin, 3 parts of silicone resin, 20 parts of quartz powder, 5 parts of curing accelerator, 10 parts of cross-linking agent, and ferrous hydroxide powder, wherein the mass of the ferrous hydroxide powder accounts for 9% of the total mass of the epoxy resin, silicone resin, quartz powder, curing accelerator, and cross-linking agent; the curing accelerator is tetrabutylammonium bromide anhydride curing accelerator;

[0065] In step S2, the adhesive containing ferrous hydroxide powder is prepared and used immediately. The preparation method of the adhesive containing ferrous hydroxide powder comprises the following steps:

[0066] A. Stir and mix liquid epoxy resin and liquid silicone resin at 100-120°C, continue stirring for 20-30 minutes, then add crosslinking agent, continue stirring and heating for 1-2 hours to obtain liquid mixed resin;

[0067] B. Add quartz powder to the liquid mixed resin in step A at 50-60°C, stir for 30 minutes, then add a curing accelerator, continue stirring for 30 minutes, and then keep static at 50-6°C for 3-4 hours to obtain a resin adhesive;

[0068] C. Add ferrous hydroxide powder to the resin adhesive in B at 40-45°C and stir at high speed for 3-5 minutes until evenly mixed to obtain a white adhesive with ferrous hydroxide powder.

[0069] The sealing layer 4 includes an inner layer 41, an interlayer 42, an outer layer 43 and a light-shielding layer 44. The inner layer 41 is a polyethylene transparent film, the interlayer 42 is a flexible transparent nano-coating, and the outer layer 43 is a polypropylene transparent film. The inner layer 41, the interlayer 42, and the outer layer 43 are bonded together in sequence. The light-shielding layer 44 is arranged on the outer surface of the outer layer 43, the interlayer 42 is bonded to the inner surface of the outer layer 43, and the inner surface of the inner layer 41 is sealed with the top of the packaging box. The area of ​​the light-shielding layer 44 is smaller than that of the outer layer 43, and the glue groove is located outside the coverage area of ​​the light-shielding layer 44.

[0070] In this embodiment, after the sealing layer is sealed and step S4 is performed, the host computer does not issue an alarm.

[0071] Example 2

[0072] This embodiment is based on the embodiment 1, and differs from the embodiment 1 in that:

[0073] The adhesive with ferrous hydroxide powder includes the following components in parts by weight: 80 parts of epoxy resin, 3 parts of silicone resin, 25 parts of quartz powder, 8 parts of curing accelerator, 15 parts of cross-linking agent, and ferrous hydroxide powder, wherein the mass of the ferrous hydroxide powder accounts for 9% of the total mass of the epoxy resin, silicone resin, quartz powder, curing accelerator, and cross-linking agent.

[0074] In this embodiment, after the sealing layer is sealed and step S4 is performed, the host computer does not issue an alarm.

[0075] Example 3

[0076] This embodiment is based on Example 1, but differs from Example 1 in that the adhesive with ferrous hydroxide powder includes the following components in parts by weight: 75 parts of epoxy resin, 3.5 parts of silicone resin, 22.5 parts of quartz powder, 6.5 parts of curing accelerator, 12.5 parts of cross-linking agent, and ferrous hydroxide powder, where the mass of the ferrous hydroxide powder accounts for 9% of the total mass of the epoxy resin, silicone resin, quartz powder, curing accelerator, and cross-linking agent.

[0077] In this embodiment, after the sealing layer is sealed and step S4 is performed, the host computer does not issue an alarm.

[0078] Example 4

[0079] This embodiment is based on the embodiment 2, but differs from the embodiment 2 in that the mass of the ferrous hydroxide powder accounts for 7% of the total mass of the epoxy resin, the silicone resin, the quartz powder, the curing accelerator, and the cross-linking agent.

[0080] In this embodiment, after the sealing layer is sealed and step S4 is performed, the host computer does not issue an alarm.

[0081] Example 5

[0082] This embodiment is based on the embodiment 2, but differs from the embodiment 2 in that the mass of the ferrous hydroxide powder accounts for 8% of the total mass of the epoxy resin, the silicone resin, the quartz powder, the curing accelerator, and the cross-linking agent.

[0083] In this embodiment, after the sealing layer is sealed and step S4 is performed, the host computer does not issue an alarm.

[0084] Example 6

[0085] In this embodiment, based on Example 2, the total thickness of the sealing layer 4 is 0.125 mm. The total thickness of the sealing layer in this embodiment is the sum of the thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer. The present invention only has requirements for the total thickness of the sealing layer and does not have any requirements for the thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer in the sealing layer. The thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer can be set according to actual usage requirements.

[0086] In this embodiment, after the sealing layer is sealed and step S4 is performed, the host computer does not issue an alarm.

[0087] Example 7

[0088] In this embodiment, based on Example 2, the thickness of the sealing layer 4 is 0.14 mm. The total thickness of the sealing layer in this embodiment is the sum of the thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer. This invention only requires the total thickness of the sealing layer; the thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer are not required. The thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer can be set according to actual usage requirements. In this embodiment, after the sealing layer is sealed and step S4 is performed, the host computer does not issue an alarm.

[0089] Example 8

[0090] In this embodiment, based on Example 2, the thickness of the sealing layer 4 is 0.15 mm. The total thickness of the sealing layer in this embodiment is the sum of the thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer. This invention only requires the total thickness of the sealing layer; the thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer are not required. The thicknesses of the inner layer, interlayer, outer layer, and light-shielding layer can be set according to actual usage requirements. In this embodiment, after the sealing layer is sealed and step S4 is performed, the host computer does not issue an alarm.

[0091] Example 9

[0092] Combine Figure 1-Figure 3As shown, based on the above embodiment, an annular enclosure 5 is provided inside the inner tube 2. The enclosure 5 is fixedly connected to the inner tube 2 wall via an annular connecting plate 6. The top surface of the annular connecting plate 6 is located lower than the top surfaces of the enclosure 5 and the inner tube 2. The inner tube 2 wall, the annular connecting plate 6, and the enclosure 5 form a groove with an open top. The groove serves as a glue overflow groove, which is located inside the glue groove. In this embodiment, after the sealing layer is sealed and step S4 is passed, the host computer does not issue an alarm.

[0093] Comparative Example 1

[0094] Based on Example 2, the difference from Example 2 is that the mass of ferrous hydroxide powder accounts for 6% of the total mass of the epoxy resin, silicone resin, quartz powder, curing accelerator and cross-linking agent.

[0095] Comparative Example 2

[0096] On the basis of Example 2, the difference from Example 2 is that the mass of ferrous hydroxide powder accounts for 10% of the total mass of epoxy resin, silicone resin, quartz powder, curing accelerator and cross-linking agent.

[0097] Comparative Example 3

[0098] Based on Example 2, the thickness of the sealing layer 4 is 0.16 mm.

[0099] Comparative Example 4

[0100] Based on Example 2, the thickness of the sealing layer 4 is 0.12 mm.

[0101] Comparative Example 5

[0102] Based on Example 2, the difference from Example 2 is that: highly transparent epoxy resin potting glue Hasuncast3010 (A / B) is used as the main part, and ferrous hydroxide powder accounting for 9% of the main part is added to prepare an adhesive with ferrous hydroxide powder.

[0103] Test Example 1

[0104] The curing time and oxidation time of the adhesives containing ferrous hydroxide powder prepared in Examples 1-5 and Comparative Examples 1, 2, and 5 were measured under the same environment. The oxidation time is defined as the time from the time the adhesive containing ferrous hydroxide powder was prepared to the time when the adhesive containing ferrous hydroxide powder turned gray-green. The curing time can be determined by referring to the prior art. The results are shown in Table 1.

[0105] Table 1 shows the test results of the curing time and oxidation time of the adhesive

[0106] Curing time Oxidation time Example 1 10h 40min Example 2 6h 30min Example 3 8h 38min Example 4 6h 60min Example 5 6h 45min Comparative Example 1 7h 72h Comparative Example 2 8h 1min Comparative Example 5 24h 30min

[0107] As shown in Table 1, the addition of ferrous hydroxide significantly affects the oxidation time of the adhesive. The optimal oxidation time is 30 minutes, which provides sufficient operating time for operators and allows for rapid detection of leaks in the sealing layer. When the sealing layer leaks, the hot pot base inside the inner tube will not deteriorate or melt after being exposed to oxygen for 1 hour. However, after 1 hour, the flavor of the hot pot base will change significantly. The curing time of the adhesive in the present invention is up to 10 hours, which is significantly shorter than that of epoxy resin curing agents commonly used in the prior art.

[0108] Test Example 2

[0109] The pressure required by the sealing layers involved in Examples 6-8 and Comparative Examples 3 and 4 to seal the packaging structure of the present invention was tested, and the sealing status of the packaging box after being sealed with the above sealing layer was tested for 24 hours. The method for testing the sealing status of the packaging box for 24 hours refers to S4 of the present invention, and the specific steps are as follows:

[0110] a. Place the package containing the hot pot base after sealing in step S3 in a high oxygen and high humidity environment with an oxygen content of 50% and a relative humidity of 95% for 24 hours;

[0111] b. In step a, the packaging box is placed in a high-oxygen and high-humidity environment for 24 hours, and an image acquisition device is used to capture the color of the adhesive at the location of the adhesive groove of the packaging box in real time. The image acquisition device transmits the captured image to a host computer, and the host computer extracts the color of the adhesive at the location of the adhesive groove of the packaging box from the image;

[0112] Within 72 hours, when the host computer monitors the color change of the adhesive, it will issue an alarm, warning that the packaging box is not completely sealed and there is a leak point;

[0113] If the host computer does not give an alarm within 72 hours, it means that the packaging box is completely sealed and the packaging box sealing performance test is completed.

[0114] The results are shown in Table 2.

[0115] Table 2 shows the test results of sealing layer sealing pressure and sealing performance

[0116] Sealing pressure Sealed state Example 6 0.65MPa completely sealed Example 7 0.85MPa completely sealed Example 8 1MPa completely sealed Comparative Example 3 1.2MPa Leakage point Comparative Example 4 0.4MPa Leakage point

[0117] If the sealing layer is too thick, it is difficult to fit tightly with the packaging structure and cracks will appear in a short time; if the sealing layer is too thin, it will be damaged during sealing and squeezing. Therefore, the present invention optimizes the thickness of the sealing layer.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A packaging method for hot pot base prepared by low-temperature oil extraction technology, characterized in that: The following steps are involved: S1. A circular packaging box with a glue groove on the top is used as packaging material. The circular packaging box with a glue groove on the top comprises a vertically placed outer cylinder (1), a coaxial inner cylinder (2) of the same height is installed inside the outer cylinder (1), a horizontally placed annular partition (3) is installed between the outer cylinder (1) and the inner cylinder (2), the annular partition (3) is located below the top surfaces of the outer cylinder (1) and the inner cylinder (2), the outer cylinder (1), the inner cylinder (2), and the annular partition (3) form an annular glue groove with an opening on the top, a sealing layer (4) is provided above the outer cylinder (1) to seal the top openings of the outer cylinder (1) and the inner cylinder (2), a block of hot pot base prepared by low-temperature oil extraction technology is placed inside the inner cylinder (2), and the portion of the sealing layer (4) corresponding to the position above the glue groove is made of transparent material; S2. Prepare an adhesive containing ferrous hydroxide powder and fill the adhesive groove at the top of the packaging box with the adhesive containing ferrous hydroxide powder; S3. When the adhesive containing ferrous hydroxide powder is filled in the adhesive groove on the top of the packaging box, the sealing layer (4) on the top of the packaging box is pressed tightly against the top of the packaging box. After the adhesive containing ferrous hydroxide powder is solidified, the sealing layer (4) is sealed and connected to the top of the packaging box. Once a gap is formed between the sealing layer (4) and the top of the packaging box, the color of the adhesive inside the adhesive groove will change significantly.

2. The packaging method of the hot pot base prepared by the low-temperature oil extraction technology according to claim 1 is characterized in that: The adhesive containing ferrous hydroxide powder comprises the following components in parts by weight: 70-80 parts of epoxy resin, 3-4 parts of silicone resin, 20-25 parts of quartz powder, 5-8 parts of curing accelerator, 10-15 parts of crosslinking agent, and ferrous hydroxide powder, wherein the mass of the ferrous hydroxide powder accounts for 7-9% of the total mass of the epoxy resin, silicone resin, quartz powder, curing accelerator, and crosslinking agent.

3. The packaging method of hot pot soup base prepared by low-temperature oil extraction technology according to claim 2, characterized in that: The adhesive with ferrous hydroxide powder includes the following components in parts by weight: 80 parts of epoxy resin, 3 parts of silicone resin, 25 parts of quartz powder, 8 parts of curing accelerator, 15 parts of cross-linking agent, and ferrous hydroxide powder, wherein the mass of the ferrous hydroxide powder accounts for 9% of the total mass of the epoxy resin, silicone resin, quartz powder, curing accelerator, and cross-linking agent.

4. The packaging method of hot pot soup base prepared by low-temperature oil extraction technology according to claim 3 is characterized in that: In step S2, the adhesive containing ferrous hydroxide powder is prepared and used immediately. The preparation method of the adhesive containing ferrous hydroxide powder comprises the following steps: A. Stir and mix liquid epoxy resin and liquid silicone resin at 100-120°C, continue stirring for 20-30 minutes, then add crosslinking agent, continue stirring and heating for 1-2 hours to obtain liquid mixed resin; B. Add quartz powder to the liquid mixed resin in step A at 50-60°C, stir for 30 minutes, then add a curing accelerator, continue stirring for 30 minutes, and then keep static at 50-6°C for 3-4 hours to obtain a resin adhesive; C. Add ferrous hydroxide powder to the resin adhesive in B at 40-45°C and stir at high speed for 3-5 minutes until evenly mixed to obtain a white adhesive with ferrous hydroxide powder.

5. The packaging method of hot pot soup base prepared by low-temperature oil extraction technology according to claim 1, characterized in that: An annular enclosure (5) is provided inside the inner tube (2), and the enclosure (5) is fixedly connected to the tube wall of the inner tube (2) via an annular connecting plate (6). The top surface of the annular connecting plate (6) is located lower than the top surfaces of the enclosure (5) and the inner tube (2). The tube wall of the inner tube (2), the annular connecting plate (6), and the enclosure (5) form a groove with an opening at the top, and the groove is a glue overflow groove, which is located on the inner side of the glue groove.

6. The packaging method of hot pot soup base prepared by low-temperature oil extraction technology according to claim 1, characterized in that: The sealing layer (4) comprises an inner layer (41), an interlayer (42), an outer layer (43) and a light-shielding layer (44); the inner layer (41) is a polyethylene transparent film; the interlayer (42) is a flexible transparent nano-coating; and the outer layer (43) is a polypropylene transparent film. The inner layer (41), the interlayer (42) and the outer layer (43) are sequentially bonded together; the light-shielding layer (44) is arranged on the outer surface of the outer layer (43); the interlayer (42) is bonded to the inner surface of the outer layer (43); the inner surface of the inner layer (41) is sealed and connected to the top of the packaging box; the area of ​​the light-shielding layer (44) is smaller than that of the outer layer (43); and the glue groove is located outside the coverage area of ​​the light-shielding layer (44).

7. The packaging method of hot pot soup base prepared by low-temperature oil extraction technology according to claim 4, characterized in that: The curing accelerator is tetrabutylammonium bromide anhydride curing accelerator.

8. The packaging method of hot pot soup base prepared by low-temperature oil extraction technology according to claim 1, characterized in that: The method further includes step S4, wherein the sealing performance of the package box sealed in step S3 is tested. The specific steps are as follows: a. Place the package containing the hot pot base after sealing in step S3 in a high oxygen and high humidity environment with an oxygen content of 50% and a relative humidity of 95% for 24 hours; b. In step a, the packaging box is placed in a high-oxygen and high-humidity environment for 24 hours, and an image acquisition device is used to capture the color of the adhesive at the location of the adhesive groove of the packaging box in real time. The image acquisition device transmits the captured image to a host computer, and the host computer extracts the color of the adhesive at the location of the adhesive groove of the packaging box from the image; Within 24 hours, when the host computer monitors the color change of the adhesive, it will issue an alarm, warning that the packaging box is not completely sealed and there is a leak point; If the host computer does not give an alarm within 24 hours, it means that the packaging box is completely sealed and the packaging box sealing performance test is completed.

9. The packaging method of hot pot soup base prepared by low-temperature oil extraction technology according to claim 6, characterized in that: The total thickness of the sealing layer (4) is 0.125-0.15 mm.

10. The packaging method of hot pot soup base prepared by low-temperature oil extraction technology according to claim 6, characterized in that: The outer wall of the outer cylinder (1) is covered with a light-shielding and heat-insulating film.

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