A thawing status indicator and preparation method thereof

Abstract

The present invention relates to a thawing state indicator, comprising a reaction module A, a reaction module B and a response module, each of which is independent of the other. The response module is in close contact with the reaction module A and the reaction module B at the same time under the action of force, wherein: the response module, as a carrier, can quickly absorb a first reagent and a second reagent, the original color of the first reagent and the second reagent or the color of a new substance produced after the first reagent and the second reagent contact reaction can be displayed through the carrier, the thawing state of the reaction module A and the reaction module B is basically consistent with the thawing state of the product, and the carrier will display different colors for different product thawing states, and the color change of the carrier can indicate what kind of thawing state the product is in or what kind of thawing history it has experienced. In the preparation of the indicator: the reaction module A, the reaction module B and the response module can be prepared independently. The thawing state indicator has a fast recognition speed, a stable indication result and an irreversible state.

Description

Technical Field

[0001] The invention relates to the technical field of monitoring and reporting the thawing history of frozen products, and in particular to a thawing status indicator and a preparation method thereof. Background Art

[0002] Fast food with high requirements for taste and flavor requires a more demanding processing method to ensure the taste and nutritional value of the food. According to research, the main reason for food spoilage is microbial growth. Common methods to avoid microbial growth include high-temperature sterilization, vacuum packaging, low-temperature storage and transportation, etc. Among them, low-temperature storage and transportation has become a widely used method in the transportation process of some fast food.

[0003] Using thawing indicators to monitor and report the thawing history of frozen and quick-frozen foods can prevent spoiled foods from refreezing and entering the market due to long thawing time, effectively reducing food safety risks. Although the demand for thawing indicators almost emerged at the same time as the emergence of frozen and quick-frozen foods, the existing thawing indicator products and technologies at home and abroad have certain limitations.

[0004] In the prior art, such as the patent of US patent application number US3220259, a kind of indicator which utilizes pre-freezing liquid into solid, observing shape change, and recording whether thawing process has occurred is mentioned. The indicator needs to be pre-frozen and then change the placement position of the indicator, and the reported thawing time is generally very short (30 to 60 minutes). In addition, the freeze-thaw switch strategy of Chinese patent number CN1554016A can extend the response time of the thawing indicator, but the activity of the enzyme used in the indicator usually changes during storage, resulting in the difficulty of accurately controlling the response time. Chinese patent number CN109029766.A mentions a reaction assembly in two different chambers, through low temperature treatment, freezing one part into solid, separating from the other part, and when the temperature reaches the liquefaction temperature point, the two reactants contact, and an irreversible color reaction occurs, but the assembly is large, and there is a risk that the reaction cannot be carried out after inverted installation. In addition, the current thawing state indicator indicates the thawing state by indicator shape change or indicator color change, and the stability is not high. Summary of the invention

[0005] The purpose of the present application is to provide a thawing status indicator, which can quickly, accurately and stably identify the thawing status of a product, the thawing status of the indicator is irreversible, and the preparation method is simple and the cost is low.

[0006] To achieve the above-mentioned purpose, the present application provides a thawing status indicator, comprising a respective independent reaction module A, a reaction module B and a response module, wherein the response module is in close contact with the reaction module A and the reaction module B at the same time under the action of force, the reaction module A comprises a first reagent having a first color, the reaction module B comprises a second reagent, and the second reagent and the first reagent act together to produce a substance having a second color after being mixed, and the second color is different from the first color, and the response module is a carrier for adsorbing the first reagent and the second reagent, and the first reagent and the second reagent act together on the response module, so that the response module indicates the thawing status of the product.

[0007] As a further improvement of the present application, the first reagent is at least one of an acid indicator, an alkaline indicator, a pH indicator, and a metal ion indicator.

[0008] As a further improvement of the present application, the second reagent corresponding to the acidic indicator is an acidic substance; the second reagent corresponding to the alkaline indicator is an alkaline substance; the second reagent corresponding to the pH indicator is a substance with a specific pH value; and the second reagent corresponding to the metal ion indicator is a soluble metal salt.

[0009] As a further improvement of the present application, the material used to prepare the response module is a material that easily absorbs water or oil.

[0010] As a further improvement of the present application, the material that is easily absorbent to water or oil is at least one of wood fiber paper, bamboo fiber paper, grass fiber paper, cotton fiber paper, synthetic fiber paper, and glass fiber paper.

[0011] As a further improvement of the present application, the reaction module A further includes a first adsorption material, and the reaction module B further includes a second adsorption material.

[0012] As a further improvement of the present application, the first adsorption material and / or the second adsorption material is at least one of cellulose paper, porous silica gel, and hydrogel.

[0013] As a further improvement of the present application, the reaction module A further includes a first diluent for dissolving the first reagent, and the reaction module B further includes a second diluent for dissolving the second reagent.

[0014] As a further improvement of the present application, the first diluent and / or the second diluent is an aqueous solution.

[0015] As a further improvement of the present application, the freezing point of the aqueous solution is -50°C to 0°C.

[0016] As a further improvement of the present application, the pH value of the aqueous solution ranges from 3.0 to 11.0.

[0017] As a further improvement of the present application, it includes a first accommodating chamber and a second accommodating chamber, the reaction module A is placed in the first accommodating chamber, the reaction module B is placed in the second accommodating chamber, and the response module is independent of the first accommodating chamber and the second accommodating chamber.

[0018] As a further improvement of the present application, the first accommodating cavity and the second accommodating cavity are arranged adjacent to each other.

[0019] As a further improvement of the present application, it includes a transparent lower shell and a transparent upper shell, the lower shell and the upper shell together form the first accommodating chamber and the second accommodating chamber, the lower shell is provided with a first isolation piece for isolating the first accommodating chamber and the second accommodating chamber, and the upper shell is provided with a through hole for facilitating the simultaneous contact between the response module and the reaction module A and the reaction module B.

[0020] As a further improvement of the present application, it also includes a support film for fixing the response module, the support film is arranged on the upper shell, the response module is fixed to the side of the support film that contacts the upper shell and is placed on the through hole, and a second isolation member sealed with the upper shell is provided at the edge of the through hole, and the second isolation member is used to prevent the response module from contacting the reaction module A and the reaction module B when there is no force.

[0021] As a further improvement of the present application, a single-sided release film is provided on the side of the support film in contact with the upper shell, the response module is fixed on the single-sided release film, and the peeling force of the single-sided release film is ≥1000gf.

[0022] As a further improvement of the present application, the response module is fixed on the single-sided release film by a first adhesive.

[0023] As a further improvement of the present application, the first adhesive is at least one of acrylic substrate-free double-sided adhesive, low tg value polyester resin, and silicone-containing resin.

[0024] To achieve the above-mentioned purpose, the present application also provides a method for preparing a thawing status indicator, comprising the following steps: S1, preparing a reaction module A: preparing a first adsorption material and a first reagent, and dripping the first reagent onto the first adsorption material until it is completely soaked but no liquid flows out, to obtain a reaction module A; S2, preparing a reaction module B: preparing a second adsorption material and a second reagent, and dripping the second reagent onto the second adsorption material until it is completely soaked but no liquid flows out, to obtain a reaction module B; S3, preparing a response module: preparing a carrier for adsorbing the first reagent and the second reagent, and the carrier is a response module.

[0025] As a further improvement of the present application, the reaction module A is placed in the first accommodating chamber, and the reaction module B is placed in the second accommodating chamber. The first accommodating chamber and the second accommodating chamber are prepared by a transparent lower shell and a transparent upper shell. The lower shell is provided with a first isolating piece for isolating the first accommodating chamber and the second accommodating chamber. The upper shell is provided with a through hole for facilitating the response module to contact the reaction module A and the reaction module B at the same time. A supporting film is provided on the upper shell. The response module is fixed to a side of the support film in contact with the upper shell and is placed on the through hole. A second isolating piece sealed and connected to the upper shell is provided at the edge of the through hole. The second isolating piece is used to prevent the response module from contacting the reaction module A and the reaction module B when no force is applied.

[0026] The beneficial effect of the present application is that a thawing status indicator is designed, comprising a reaction module A, a reaction module B and a response module which are independent of each other, and the response module is in close contact with the reaction module A and the reaction module B at the same time under the action of force. The response module in the thawing status indicator serves as a carrier for adsorbing the first reagent in the reaction module A and the second reagent in the reaction module B, and the adsorption speed is fast. The first reagent and the second reagent gradually react to different degrees in the carrier according to the thawing state. Therefore, the thawing recognition speed is fast, the state is irreversible, and the indication result is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a reaction state schematic diagram of the thawing state indicator;

[0028] Figure 2 The packaging structure of the reaction module A and the reaction module B in the thawing status indicator in Example 2;

[0029] Figure 3 The packaging structure of the reaction module A, the reaction module B and the response module in the thawing status indicator in Example 3;

[0030] Figure 4 It is a schematic diagram of the exploded structure of the thawing status indicator in Example 5 and Example 6;

[0031] Figure 5 This is a schematic diagram of the structure of the thawing status indicator after assembly in Example 6;

[0032] In the figure: 1. reaction module A; 2. reaction module B; 3. response module; 4. lower shell; 5. upper shell; 6. first isolation member; 7. first accommodating cavity; 8. second accommodating cavity; 9. through hole; 10. supporting film; 11. second isolation member; 12. first adhesive glue; 13. second adhesive glue; 401. first lower shell empty slot; 402. empty circular area; 403. second lower shell empty slot; 404. lower shell card slot; 405. isolation part; 406. lower shell side sealing part; 501. first upper shell empty slot; 502. curved isolation part inside the upper shell; 503. second upper shell empty slot; 504. upper shell card slot. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be clearly and completely described below in combination with the specific embodiments and drawings of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments, and are not intended to limit the scope of the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0034] In order to prepare a thawing status indicator that can be quickly identified, has an irreversible and stable state, the present application provides a thawing status indicator, such as Figure 1As shown, it includes a reaction module A1, a reaction module B2 and a response module 3 which are independent of each other. The response module 3 is in close contact with the reaction module A1 and the reaction module B2 at the same time under the action of a force. The force that makes the response module 3 in close contact with the reaction module A1 and the reaction module B2 can be an adhesive force, a capillary force, etc. Under the action of the adhesive force, the response module 3 is in contact with the reaction module A1 and the reaction module B2, and under the capillary force, the response module 3 can be connected with the reaction module A1 and the reaction module B2 through a capillary. The reaction module A1 includes a first reagent with a first color, and the reaction module B2 includes a second reagent. After the second reagent is mixed with the first reagent, they act together to produce a substance with a second color, and the second color is different from the first color. The response module 3 is a carrier that adsorbs the first reagent and the second reagent. The first reagent and the second reagent act together on the response module 3, so that the response module 3 indicates the thawing state of the product. In this solution, the response module 3 acts as a carrier, which can quickly absorb the first reagent and the second reagent. The original color of the first reagent and the second reagent or the color of the new substance produced after the first reagent and the second reagent contact reaction can be displayed by the carrier. The thawing state of the reaction module A1 and the reaction module B2 is basically consistent with the thawing state of the product. The carrier will show different colors corresponding to different thawing states of the product. The color change of the carrier can indicate what kind of thawing state the product is in or what kind of thawing history it has experienced. The thawing state indicator has a fast recognition speed, stable indication results and irreversible state. Preferably, the material for preparing the response module 3 is a material that is easy to absorb water or oil. Further, the material that is easy to absorb water or oil can be but is not limited to at least one of wood fiber paper, bamboo fiber paper, grass fiber paper, cotton fiber paper, synthetic fiber paper, glass fiber paper, etc. Preferably, the first reagent can be but is not limited to at least one of an acid indicator, an alkaline indicator, a pH indicator, a metal ion indicator, etc. Among them: when the first reagent is an acidic indicator, the corresponding second reagent is an acidic substance; when the first reagent is an alkaline indicator, the corresponding second reagent is an alkaline substance; when the first reagent is a pH indicator, the corresponding second reagent is a substance with a specific pH value; when the first reagent is a metal ion indicator, the corresponding second reagent is a soluble metal salt.

[0035] When in use, the reaction module A1 and the reaction module B2 are first placed in a low temperature environment to freeze, so that the first reagent and the second reagent are frozen into a solid state, and then the above-mentioned thawing state indicator is placed on the outer surface of the product packaging. At this time, the first reagent and the second reagent are in close contact with the surface of the product outer packaging. The first reagent and the second reagent will change with the temperature change of the product, and an external force is applied to the response module 3 so that the response module 3 is in close contact with the reaction module A1 and the reaction module B2 at the same time. For example, when the product is heated up by the external environment, the heat absorbed by the product will be transferred to the first reagent and the second reagent, thereby causing the first reagent and the second reagent to heat up and melt continuously, and the melted first reagent and the second reagent will be gradually adsorbed into the response module 3. When the first reagent and the second reagent are not in contact in the response module 3, the response module 3 only displays the first color of the first reagent, and the color status indication of the response module 3 indicates that the product has undergone a heating process, and the product quality may be affected by the heating; when the first reagent and the second reagent are partially in contact in the response module 3, the response module 3 displays the first color of the first reagent and the second color after the reaction of the first reagent and the second reagent, and the color status indication of the response module 3 indicates that the product has undergone a heating process, and the heating process lasts for a long time, and the product quality is seriously affected by the heating; when the first reagent and the second reagent are completely in contact in the response module 3, the response module 3 only displays the second color after the reaction of the first reagent and the second reagent, and the color status indication of the response module 3 indicates that the product has undergone a heating process, and the heating process lasts for a very long time, and the product quality is seriously affected by the heating. In addition, when the product is not affected by the external environment, the first reagent and the second reagent will not absorb heat and melt, so the response module 3 does not show any color change, and the color status indication of the response module 3 indicates that the product has not undergone a heating process, or the heating process has little effect on the quality of the product.

[0036] In view of the above technical solution, the first reagent and the second reagent in the present application can be set in reverse, that is, the second reagent can be set as a reagent with color and the first reagent can be colorless; or the second reagent can be set to have a color different from the first reagent. As long as the response module 3 displays different color changes according to the thawing state of the product, it is not limited to the design of the first reagent and the second reagent mentioned above.

[0037] In the present application, as a preferred embodiment, the reaction module A1 further includes a first adsorption material, which is used to store the first solvent without any reaction, so as to facilitate the movement and storage of the reaction module A1; the reaction module B2 further includes a second adsorption material, which is used to store the second solvent without any reaction, so as to facilitate the movement and storage of the reaction module B2. Preferably, the first adsorption material may be but is not limited to at least one of cellulose paper, porous silica gel, hydrogel, etc.; the second adsorption material may be but is not limited to at least one of cellulose paper, porous silica gel, hydrogel, etc.

[0038] In the present application, as a preferred embodiment, the reaction module A1 also includes a first diluent for dissolving the first reagent, the first diluent is used to dilute the first reagent without any reaction, and is convenient for subsequent adjustment of the freezing point and pH value of the first reagent; the reaction module B2 also includes a second diluent for dissolving the second reagent, the second diluent is used to dilute the second reagent without any reaction, and is convenient for subsequent adjustment of the freezing point and pH value of the second reagent. Preferably, the first diluent and / or the second diluent can be but not limited to an aqueous solution, and the aqueous solution is a mixed aqueous solution formed by dissolving a solute in water, such as dissolving a color developer, an acid or alkali for adjusting the pH value, sodium chloride, potassium chloride, calcium chloride, etc. in water to form a mixed solution, etc., and the aqueous solution is convenient for normal temperature production, normal temperature storage, normal temperature installation and carrying as a diluent. Preferably, the freezing point of the aqueous solution is -50°C to 0°C, and further preferably, the substance for adjusting the freezing point of the aqueous solution can be but not limited to at least one of sodium chloride, potassium chloride, calcium chloride, etc. Preferably, the pH value of the aqueous solution is in the range of 3.0-11.0. More preferably, the acid for adjusting the pH value of the aqueous solution is a non-volatile acid, which may be but is not limited to one or more of phosphoric acid, sulfuric acid, perchloric acid, silicic acid, etc., and the base for adjusting the pH value of the aqueous solution may be but is not limited to one or more of sodium hydroxide, potassium hydroxide, barium hydroxide, etc. According to the freezing point of the product to be tested and the first reagent and the second reagent used, the diluent for adjusting the freezing point and pH value of the reaction module A1 and the reaction module B2 can be any, not limited to the above technical solution.

[0039] Example 1

[0040] In the present application, as a preferred embodiment, the thawing status indicator further includes a first accommodating chamber 7 and a second accommodating chamber 8, the reaction module A 1 is placed in the first accommodating chamber 7, the reaction module B 2 is placed in the second accommodating chamber 8, and the response module 3 is independent of the first accommodating chamber 7 and the second accommodating chamber 8. The first accommodating chamber 7 and the second accommodating chamber 8 can be designed according to the conditions of carrying or transportation, which is convenient for carrying or transporting the thawing status indicator. As a further preferred embodiment, the first accommodating chamber 7 and the second accommodating chamber 8 are arranged adjacent to each other, which is conducive to reducing the volume of the thawing status indicator and further facilitating carrying and transportation in small product applications. In this embodiment, the first accommodating chamber 7 and the second accommodating chamber 8 are not limited to Figures 2 to 5 In the structure shown in FIG. 1 , the first accommodating chamber 7 is only used to store the reaction module A1 , and any structure that can achieve this function is applicable, and the same is true for the second accommodating chamber 8 .

[0041] Example 2

[0042] In the present application, in order to prepare a portable thawing status indicator, the device for accommodating the reaction module A1 and the reaction module B2 can be implemented by the following scheme, preferably, as follows: Figure 2 As shown, the thawing status indicator may include a transparent lower shell 4 and a transparent upper shell 5 matching the lower shell 4, the lower shell 4 and the upper shell 5 form a cavity, the lower shell 4 is provided with a first isolating member 6, the first isolating member 6 divides the cavity into a first accommodating chamber 7 and a second accommodating chamber 8, preferably, the first isolating member 6 divides the cavity into a symmetrical first accommodating chamber 7 and a second accommodating chamber 8, further avoiding the influence of the reaction module A1 and the reaction module B2 melting asynchronously on the indication result. The upper shell 5 is provided with a through hole 9 for facilitating the response module 3 to contact with the reaction module A1 and the reaction module B2 at the same time. The shape of the lower shell 4 and the upper shell 5 can be, but not limited to, circular, hexagonal, square, rectangular and other polygonal shapes, etc., preferably, the shape of the lower shell 4 and the upper shell 5 is circular, and the circular design is more beautiful. Preferably, the material for preparing the upper shell 5 and / or the lower shell 4 can be but is not limited to at least one of PP, PE, polyester, PVDF, metal foil, aluminum-plastic film, and polysiloxane; the thickness of the upper shell 5 and / or the lower shell 4 can be set as needed, preferably 100μm to 500μm.

[0043] Example 3

[0044] In the present application, in order to further facilitate the carrying of the thawing status indicator, based on the above-mentioned embodiment of the thawing status indicator which is convenient for carrying, the thawing status indicator further includes a supporting film 10 for fixing the response module 3, such as Figure 3As shown, the support film 10 is arranged on the upper shell 5, the response module 3 is fixed to the side of the support film 10 in contact with the upper shell 5 and is placed on the through hole 9, and a second isolation member 11 sealed and connected to the upper shell 5 is provided at the edge of the through hole 9, and the second isolation member 11 is used to prevent the response module 3 from contacting the reaction module A1 and the reaction module B2 under the condition of no force. This structural design can encapsulate the response module 3, the reaction module A1 and the reaction module B2 into one structure at the same time, which is further convenient to carry.

[0045] Example 4

[0046] For the portable thawing indicator in Example 3, the support film 10 can be but not limited to at least one of PP, PE, PI, polyester, polyurethane, and polysiloxane; the thickness of the support film 10 is 10 μm to 50 μm. Further preferably, a single-sided release film is provided on the side of the support film 10 that contacts the upper shell 5, and the response module 3 is fixed on the single-sided release film. The function of the single-sided release film is to facilitate the response module 3 to be quickly separated from the support film 10 when pressure is applied to the response module 3, and quickly and closely contact with the reaction module A 1 and the reaction module B 2, so as to carry out the next step of the reaction. Further preferably, the peeling force of the single-sided release film is ≥1000 gf. The response module 3 is further fixed on the single-sided release film by a first adhesive 12. As an optional embodiment, the first adhesive 12 can be but is not limited to at least one of acrylic substrate-free double-sided adhesive, low tg value polyester resin, silicone-containing resin, etc.; the thickness of the first adhesive 12 is 10μm to 100μm.

[0047] Example 5

[0048] On the basis of Example 3 and / or Example 4, Figure 4 As shown, a second adhesive glue 13 is provided at a position corresponding to the through hole 9 on the lower shell 4. When the response module 3 is separated from the support film 10, the second adhesive glue 13 can adsorb the response module 3, accelerate the contact between the response module 3 and the reaction module A1 and the reaction module B2, and make the response module 3 contact the reaction module A1 and the reaction module B2 more firmly, so as to facilitate the first reagent in the reaction module A1 and the second reagent in the reaction module B2 to be adsorbed into the response module 3. As an optional embodiment, the second adhesive glue 13 can be but is not limited to at least one of acrylic substrate-free double-sided adhesive, low tg value polyester resin, and silicone-containing resin; the thickness of the second adhesive glue 13 is 10μm to 200μm.

[0049] In order to prepare a thawing status indicator that can be quickly identified, has an irreversible and stable state, the present application also provides a method for preparing a thawing status indicator, comprising the following steps: S1, preparing a reaction module A1: preparing a first adsorption material and a first reagent, and dripping the first reagent onto the first adsorption material until it is completely soaked but no liquid flows out, to obtain a reaction module A1; S2, preparing a reaction module B2: preparing a second adsorption material and a second reagent, and dripping the second reagent onto the second adsorption material until it is completely soaked but no liquid flows out, to obtain a reaction module B2; S3, preparing a response module 3: preparing a carrier for adsorbing the first reagent and the second reagent, and the carrier is the response module 3. Preferably, the reaction module A1 is placed in the first accommodating chamber 7, and the reaction module B2 is placed in the second accommodating chamber 8. The first accommodating chamber 7 and the second accommodating chamber 8 are prepared by a transparent lower shell 4 and a transparent upper shell 5. The lower shell 4 is provided with a first isolating member 6 for isolating the first accommodating chamber 7 and the second accommodating chamber 8. The upper shell 5 is provided with a through hole 9 for facilitating the response module 3 to contact the reaction module A1 and the reaction module B2 at the same time. A supporting film 10 is provided on the upper shell 5. The response module 3 is fixed to a side of the supporting film 10 in contact with the upper shell 5 and is placed on the through hole 9. A second isolating member 11 sealed and connected to the upper shell 5 is provided at the edge of the through hole 9. The second isolating member 11 is used to prevent the response module 3 from contacting the reaction module A1 and the reaction module B2 when no force is applied.

[0050] Example 6

[0051] A thawing status indicator, which consists of Figure 4 The components shown in the figure include a lower shell 4 and an upper shell 5. Both the lower shell 4 and the upper shell 5 are made of hard transparent PP plastic, and both the lower shell 4 and the upper shell 5 are circular shells with a diameter of 2 cm. The thickness of the circular shell assembled by the lower shell 4 and the upper shell 5 is 400 μm.

[0052] The lower shell 4 includes a first lower shell slot 401, an empty circular area 402, a second lower shell slot 403, a lower shell slot 404, an isolation portion 405 and a lower shell side sealing portion 406; the upper shell 5 includes a first upper shell slot 501, an upper shell inner curved isolation portion 502, a second upper shell slot 503 and an upper shell slot 504. The lower shell 4 and the upper shell 5 can be completely assembled together.

[0053] During assembly: use a 30 μm thick double-sided adhesive without substrate to fix the reaction module A1 in the first lower shell slot 401; use a 30 μm thick double-sided adhesive without substrate to fix the reaction module B2 in the second lower shell slot 403; apply a 150 μm thick round second adhesive glue 13 layer to the vacant round area 402; the lower shell slot 404 is used for interlocking; a 30 μm thick double-sided adhesive without substrate is provided at the isolation part 405. The first upper shell slot 501 and the second upper shell slot 503 on the upper shell 5 are used to fix the reaction module A1 and the reaction module B2 respectively. The curved isolation part 502 in the upper shell is used to prevent the reaction module A1 and the reaction module B2 from contacting the response module 3. The upper shell slot 504 is used for interlocking. The lower shell slot 404 can be tightly buckled with the upper shell slot 504 to form a complete frame. A circular single-sided release film with a peeling force of ≥1000gf is attached to the inner side of the support film 10. The support film 10 is used to be attached to the surface of the hard transparent plastic shell, that is, attached to the surface of the upper shell 5, with the release film facing inward, and a first adhesive 12 is attached to one side of the release surface. The response module 3 is attached to the first adhesive 12 when the product is not started.

[0054] In the above-mentioned embodiment 6, the irregularly structured reaction module A1 and reaction module B2 are both made of cellulose paper with a thickness of 2 mm as the adsorption material and are shaped as follows: Figure 4 As shown. Prepare 1% litmus reagent, and then use extremely dilute phosphoric acid to turn the litmus reagent into a purple litmus solution, and drip the purple litmus solution on the cellulose paper of the reaction module A1 until it is completely soaked but no liquid flows out, to obtain the reaction module A1. Prepare 0.5% NaOH solution, and drip the NaOH solution on the cellulose paper of the reaction module B2 until it is completely soaked but no liquid flows out, to obtain the reaction module B2. The response module 3 uses 100μm thick white cellulose paper. Combine the lower shell 4, the upper shell 5, the reaction module A1, the reaction module B2 and the response module 3, and use the packaging film material to encapsulate the whole, to obtain the overall structure diagram of the thawing status indicator, as shown Figure 5 shown.

[0055] Example 7

[0056] The use steps of the thawing status indicator prepared in Example 6 are as follows: At room temperature, the thawing status indicator is attached to the outer surface of the quick-frozen food packaging, and is placed in a -10°C environment for freezing. The liquids in the reaction modules A1 and B2 of the thawing status indicator are all frozen into a solid state. At low temperatures, the response module is pressed with a finger, and the response module is attached to the second adhesive layer, and is in contact with the reaction modules A1 and B2 at the same time, and is separated from the support film. Then the item to be monitored is taken out of the low temperature environment, placed in a room temperature environment, and the surface temperature of the quick-frozen food is recorded using a thermometer. When the temperature rises to 0°C, the liquids in the reaction modules A1 and B2 are thawed, and it is found that the response module begins to absorb the liquids in the reaction modules A1 and B2, and a light purple color appears on the side in contact with A. When the temperature is maintained for 10 minutes, the material of the response module is preferably white, and the white response module is all colored, and the color is blue.

[0057] Since the color change of the response module is irreversible, once different degrees of color appear on the response module, it means that the thawing status indicator has experienced different degrees of temperature increase process, and these temperature increase processes are all detrimental to the quality of the food.

[0058] Response module color status indication result analysis:

[0059] 1) When no color appears in the white response module, it means that the quick-frozen food has not undergone a heating process, or the heating process has little effect on the quality of the quick-frozen food; 2) When part of the white response module appears purple, it means that the quick-frozen food has undergone a heating process, and the quality of the quick-frozen food may be affected by the heating process; 3) When the white start module appears blue, it means that the quick-frozen food has undergone a heating process, and the heating process lasts for a long time, and the quality of the quick-frozen food is seriously affected.

[0060] In summary, the thawing status indicator provided by the present application includes a reaction module A, a reaction module B and a response module, each of which is independent of the other. The response module is in close contact with the reaction module A and the reaction module B at the same time under the action of force. The reaction module A includes a first reagent having a first color, and the reaction module B includes a second reagent. The second reagent and the first reagent are mixed and work together to produce a substance having a second color, and the second color is different from the first color. In this solution, the response module acts as a carrier, which can quickly absorb the first reagent and the second reagent. The original color of the first reagent and the second reagent or the color of the new substance produced after the first reagent and the second reagent contact reaction can be displayed by the carrier. The thawing state of the reaction module A and the reaction module B is basically consistent with the thawing state of the product. The carrier will show different colors for different product thawing states. The color change of the carrier can indicate what kind of thawing state the product is in or what kind of thawing history it has experienced. The thawing status indicator has a fast recognition speed, a stable indication result and an irreversible state. The thawing status indicator can be produced and installed at room temperature, and can be quickly started at low temperature. It can be mass-produced to solve the technical difficulties of temperature reduction monitoring in the current cold chain transportation process and reduce food safety risks. It can be widely used in the fields of food that needs to record the heating process and biological products that need to avoid heating.

[0061] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0062] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thawing status indicator, characterized in that: It comprises a reaction module A, a reaction module B and a response module which are independent of each other. The response module is in close contact with the reaction module A and the reaction module B at the same time under the action of force. The reaction module A comprises a first reagent having a first color. The reaction module B comprises a second reagent. The second reagent and the first reagent are mixed and act together to produce a substance having a second color. The second color is different from the first color. The response module is a carrier for absorbing the first reagent and the second reagent. The first reagent and the second reagent act together on the response module so that the response module indicates the thawing state of the product. The device comprises a transparent lower shell and a transparent upper shell, wherein the lower shell and the upper shell together form a first accommodating chamber and a second accommodating chamber, the lower shell is provided with a first isolating member isolating the first accommodating chamber and the second accommodating chamber, and the upper shell is provided with a through hole for facilitating the response module to contact with the reaction module A and the reaction module B at the same time; It also includes a support film for fixing the response module, the support film is arranged on the upper shell, the response module is fixed to a side of the support film that contacts the upper shell and is placed on the through hole, and a second isolation member sealed with the upper shell is provided at the edge of the through hole, and the second isolation member is used to prevent the response module from contacting the reaction module A and the reaction module B when no force is applied.

2. The thawing status indicator according to claim 1, characterized in that: The first reagent is at least one of an acid indicator, an alkaline indicator, a pH indicator, and a metal ion indicator.

3. The thawing status indicator according to claim 2, characterized in that: The second reagent corresponding to the acid indicator is an acidic substance; the second reagent corresponding to the alkaline indicator is an alkaline substance; the second reagent corresponding to the pH indicator is a substance with a specific pH value; the second reagent corresponding to the metal ion indicator is a soluble metal salt.

4. The thawing status indicator according to claim 1, characterized in that: The response module is made of a material that easily absorbs water or oil.

5. The thawing status indicator according to claim 4, characterized in that: The material that is easily absorbent of water or oil is at least one of wood fiber paper, bamboo fiber paper, grass fiber paper, cotton fiber paper, synthetic fiber paper, and glass fiber paper.

6. The thawing status indicator according to claim 1, characterized in that: The reaction module A further includes a first adsorption material, and the reaction module B further includes a second adsorption material.

7. The thawing status indicator according to claim 6, characterized in that: The first adsorption material and / or the second adsorption material is at least one of cellulose paper, porous silica gel, and hydrogel.

8. The thawing status indicator according to claim 1, characterized in that: The reaction module A further includes a first diluent for dissolving the first reagent, and the reaction module B further includes a second diluent for dissolving the second reagent.

9. The thawing status indicator according to claim 8, characterized in that: The first diluent and / or the second diluent is an aqueous solution.

10. The thawing status indicator according to claim 9, characterized in that: The freezing point of the aqueous solution is -50°C to 0°C.

11. The thawing status indicator according to claim 9, characterized in that: The pH value of the aqueous solution ranges from 3.0 to 11.

0.

12. The thawing status indicator according to claim 1, characterized in that: It comprises a first accommodating chamber and a second accommodating chamber, wherein the reaction module A is placed in the first accommodating chamber, the reaction module B is placed in the second accommodating chamber, and the response module is independent of the first accommodating chamber and the second accommodating chamber.

13. The thawing status indicator according to claim 12, characterized in that: The first accommodating chamber and the second accommodating chamber are arranged adjacent to each other.

14. The thawing status indicator according to claim 1, characterized in that: A single-sided release film is provided on a side of the support film that contacts the upper shell, the response module is fixed on the single-sided release film, and the peeling force of the single-sided release film is ≥1000gf.

15. The thawing status indicator according to claim 14, characterized in that: The response module is fixed on the single-sided release film by means of a first adhesive.

16. The thawing status indicator according to claim 15, characterized in that: The first adhesive is at least one of acrylic substrate-free double-sided adhesive, low tg value polyester resin or silicone-containing resin.

17. A method for preparing a thawing status indicator according to any one of claims 1 to 16, characterized in that: The steps include: S1. Prepare reaction module A: prepare a first adsorption material and a first reagent, and drip the first reagent onto the first adsorption material until it is completely soaked but no liquid flows out, thereby obtaining reaction module A; S2, preparing reaction module B: preparing a second adsorbent material and a second reagent, dripping the second reagent onto the second adsorbent material until it is completely soaked but no liquid flows out, thereby obtaining reaction module B; S3, preparing a response module: preparing a carrier for adsorbing the first reagent and the second reagent, wherein the carrier is a response module.

18. The method for preparing the thawing status indicator according to claim 17, characterized in that: The reaction module A is placed in the first accommodating chamber, and the reaction module B is placed in the second accommodating chamber. The first accommodating chamber and the second accommodating chamber are prepared by a transparent lower shell and a transparent upper shell. The lower shell is provided with a first isolating piece for isolating the first accommodating chamber and the second accommodating chamber. The upper shell is provided with a through hole for facilitating the response module to contact the reaction module A and the reaction module B at the same time. The upper shell is provided with a supporting film. The response module is fixed to a side of the supporting film in contact with the upper shell and is placed on the through hole. A second isolating piece sealed and connected to the upper shell is provided at the edge of the through hole. The second isolating piece is used to prevent the response module from contacting the reaction module A and the reaction module B when no force is applied.

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