Card-type oxygen absorber manufacturing method and product

Abstract

This application relates to the technical field of oxygen absorber processing, and more specifically, to a manufacturing method and product of a curd-type oxygen absorber. The manufacturing method includes the following steps: (1) mixing a high-molecular-weight polymer powder with purified water, heating in a water bath, and uniformly stirring to obtain an environmentally friendly, translucent colloid; (2) uniformly stirring the environmentally friendly colloid, bentonite, and short fiber to obtain a clay mixture; (3) adding iron powder, activated carbon, and edible salt to the clay mixture and uniformly stirring to obtain mixture A; (4) placing mixture A between two layers of release film and repeatedly rolling until a predetermined thickness is reached, peeling off the top film to obtain a wet sheet; (5) forming the wet sheet into a fixed shape and completely dehydrating it in a hot air process to obtain a dry sheet; and (6) cutting the dry sheet, rewetting it in salt water, and sealing it to obtain a curd-type oxygen absorber. The active ingredients, such as iron powder and activated carbon, are uniformly dispersed in the matrix formed by the high-molecular-weight polymer and bentonite to enhance oxygen scavenging efficiency.

Description

[Technical Field]

[0001] The present application relates to the field of oxygen absorber processing, and more particularly to a manufacturing method and product of a curd-type oxygen absorber. [Background technology]

[0002] Iron-based oxygen absorbers achieve the purpose of oxygen scavenging by producing iron hydroxide through the reaction of iron powder with oxygen and water. This chemical reaction not only consumes the oxygen in the packaging but also reduces the oxygen concentration, creating a low-oxygen environment for the food, effectively mitigating the oxidation process of the food and extending the shelf life of the food.

[0003] Iron-based oxygen absorbers are available in various forms, including powder, block, and rod. The powdered iron-based oxygen absorber consists of a reactant and a packaging film. The reactant, which may be iron powder, activated carbon, or an electrolyte solution, absorbs oxygen through an oxidation-reduction reaction between iron and oxygen, removes oxygen from the packaging, inhibits the growth and proliferation of aerobic bacteria, and extends the shelf life of food. Currently, commercially available iron-based oxygen absorbers are produced by pre-stirring the heat-generating powder, allowing it to cool, and then adding it directly to the packaging. This production method requires the heat-generating material to avoid excessive moisture and have relatively good powder flowability, with low inter-particle viscosity being the best. It is common to add silica to increase powder flowability and reduce inter-particle viscosity. This results in a high powder content and low moisture content in the formulation, which inevitably generates a large amount of dust during production, significantly impacting worker health, product cleanliness, and the cleanliness of the production environment.

[0004] However, the block-type iron-based oxygen absorber and the rod-type iron-based oxygen absorber undergo a specific molding process, such as pressing or extrusion, to form a tight block or rod-shaped structure. During this process, the raw materials are tightly bonded, reducing the possibility of dust generation. However, compared with the powder-type oxygen absorber, the reaction rate of the block-type and rod-type oxygen absorbers may be slower. This is because their surface area is relatively small, limiting the opportunity for contact with oxygen, and their oxygen absorption ability is inferior to that of the powder-type iron-based oxygen absorber, resulting in a poorer deoxidizing effect. Therefore, improvements are needed. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to improve the oxygen absorbing efficiency of the oxygen absorber, the present application provides a manufacturing method and product of a card-type oxygen absorber. [Means for solving the problem]

[0006] According to a first aspect, the present application provides a method for producing a card-type oxygen absorber, which adopts the following technical solution.

[0007] The manufacturing method of the card-type oxygen absorber is as follows: Step S1: Mixing high molecular weight polymer powder with purified water, heating in a water bath, and stirring uniformly to obtain an environmentally friendly translucent colloid; Step S2: uniformly mixing the environmentally friendly colloid, bentonite, and short fibers to obtain a clay mixture; Step S3: adding iron powder, activated carbon, and edible salt to the clay mixture and stirring uniformly to obtain mixture A; Step S4: Place the mixture A between two layers of release film, roll it through several rolls repeatedly, and after reaching a predetermined thickness, peel off the upper film to obtain a wet sheet; Step S5: The wet sheet is fixed and molded, and then completely dehydrated by a hot air process to obtain a dry sheet; The manufacturing step includes step S6 in which the dry sheet is cut, rewetted with salt water, and sealed to obtain a card-type oxygen absorber.

[0008] Raw materials such as high molecular weight polymer powder and purified water are mixed to produce an environmentally friendly colloid, which is then uniformly mixed with other ingredients such as bentonite, short fiber, iron powder, activated carbon, and edible salt. This process, unlike powdered oxygen absorbers, produces an environmentally friendly, translucent colloid after mixing, which is then rolled, dehydrated, and finally produced into a curd-shaped oxygen absorber. This process tightly bonds the raw materials, reducing dust generation, benefiting worker health and improving product and production environment cleanliness. At the same time, repeated rolling and hot air dehydration processes ensure the oxygen absorber maintains a certain strength and toughness, ensuring stable oxygen absorption performance during use. After cutting, the dry sheet is rewetted with salt water, which allows better contact between oxygen and water vapor in the package during use, thereby improving oxygen absorption performance. At the same time, the salt water rewetting treatment can further increase the flexibility and toughness of the oxygen absorber, making it less susceptible to breakage during use.

[0009] The thickness of card-type oxygen absorbers is relatively thin, making them prone to deformation and breakage during use. In this application, the card-type oxygen absorber is made by mixing raw materials such as high molecular weight polymer powder, bentonite, and short fiber, and rolling them to form a sheet with a tight and stable structure, a consistent thickness, and a consistent surface area. This design increases the oxygen absorber's exposure to oxygen, thereby improving the oxygen scavenging effect. At the same time, the use of additives such as edible salt can help regulate the reaction rate and make the deoxidation process more efficient.

[0010] Finally, the card-type oxygen absorber has a fixed shape and size, which makes it easy to package, use, and store. Compared with conventional powder, block, or bar-type oxygen absorbers, the card-type oxygen absorber makes it easier to control the amount used and the placement position, thereby improving the convenience and accuracy of use.

[0011] In step S1, polymer powder and purified water are mixed, heated in a water bath, and stirred to obtain an environmentally friendly, translucent colloid. The purpose of this step is to provide a carrier with uniformity and consistent viscosity for the subsequent mixture. In step S2, the environmentally friendly colloid is uniformly mixed with bentonite, short fiber, etc. to obtain a clay mixture. The clay mixture has consistent viscosity and plasticity, providing a good base for the subsequent addition of active ingredients such as iron powder. In step S3, active ingredients such as iron powder, activated carbon, and edible salt are added to the clay mixture and stirred uniformly. Iron powder is the main component of the oxygen scavenger, undergoing a redox reaction with oxygen; activated carbon acts as an adsorbent and catalyst; and edible salt is used to adjust the osmotic pressure and pH of the mixture. In step S4, the mixture is placed between two layers of release film and rolled to a predetermined thickness. The top film is then peeled off to obtain a wet sheet. The wet sheet is then fixed and molded, and dehydrated using a hot air process to obtain a dry sheet. The purpose of this step is to harden the mixture into a card-shaped oxygen absorber with consistent strength and stability.

[0012] Preferably, the raw materials for producing the curd-type oxygen absorber are, in parts by weight, 32-50 parts of high molecular weight polymer powder, 100-142 parts of purified water, 12-25 parts bentonite, 15-30 parts short fiber, 18-32 parts of activated carbon, 90 to 150 parts iron powder, As per 2 to 4 parts of edible salt.

[0013] By adopting the above technical solution, the weight of raw materials used to produce the card-type oxygen absorber can be optimized, the oxygen absorbing effect of the card-type oxygen absorber can be improved, and at the same time, the stability and plasticity of the card-type oxygen absorber structure can be improved, making it less likely to be broken or deformed during use.

[0014] Preferably, the staple fibers are modified staple fibers, Method A: Mixing short fibers with an ethanol solution, stirring at 100-120 r / min, adjusting the pH to 8-9 with aqueous ammonia, heating to 50-60°C, adding a titanate coupling agent and ethyl cellulose, and keeping the temperature for 60-80 minutes. After the incubation is complete, the mixture is cooled to room temperature and filtered under suction. The resulting cake is washed with absolute ethanol and deionized water, and then dried in a drying box at 100-105°C until it reaches a constant weight. This produces modified short fibers according to Method B.

[0015] The above technical solution can further enhance the overall strength and toughness of the card-type oxygen absorber, while also improving the breathability and moisture retention of the oxygen absorber, allowing the oxygen absorber to better contact with oxygen and water vapor in the package, accelerating the oxygen scavenging reaction and improving the oxygen scavenging effect.

[0016] By mixing with an ethanol solution, adjusting the pH with aqueous ammonia, heating, and adding a titanate coupling agent and ethyl cellulose, the surface of the short fibers is effectively modified, allowing them to bond more tightly with other raw materials (such as high molecular weight polymer powder, bentonite, iron powder, etc.), thereby improving the structural stability of the oxygen absorber during use. At the same time, the modified short fibers have good fluidity and plasticity, which facilitates molding and processing during the production of carded oxygen absorbers. At the same time, the reinforcing role of the short fibers makes the oxygen absorber less susceptible to breakage or deformation during subsequent processing such as cutting and shredding.

[0017] Preferably, the raw material for producing the modified short fibers comprises, in parts by weight: 15-30 parts short fiber, 20-40 parts of ethanol solution, 4 to 8 parts aqueous ammonia, 2 to 3 parts titanate coupling agent, Ethyl cellulose 2 to 4 parts.

[0018] The above technical solution optimizes the weight of the raw materials used to produce the modified short fibers and further improves the bonding strength between the short fibers and the base material, such as high molecular weight polymer powder, so that the carded oxygen absorber has higher physical strength and toughness and can better resist external impact and abrasion. At the same time, the dispersion of the short fibers is further improved, increasing the contact area between the oxygen absorber and the oxygen inside the package, thereby improving the oxygen scavenging efficiency. At the same time, the reinforcing role of the short fibers can make the oxygen diffusion path inside the oxygen absorber more complex, prolonging the reaction time between oxygen and the oxygen scavenging components, and further improving the oxygen scavenging effect.

[0019] Preferably, the bentonite is pretreated before step S2, which step comprises: The bentonite is crushed, sieved through a 300-500 mesh sieve, added to a sodium salt solution, stirred for 1-2 hours, filtered, the residue removed, and dried to obtain pretreated bentonite.

[0020] Grinding bentonite to 300-500 mesh reduces its particle size and increases its specific surface area, improving its dispersibility in oxygen absorbers, allowing it to mix more thoroughly with other ingredients and form a more uniform structure. Adding a sodium salt solution and stirring for 1-2 hours simultaneously alters the surface charge of the bentonite, enhancing its compatibility and reactivity with other components in the oxygen absorber. Pretreated bentonite provides better skeletal support within the oxygen absorber, enhancing its physical strength and toughness. Bentonite also has good water absorption and expansion properties, allowing it to absorb and retain a certain amount of moisture, helping to maintain the stability and durability of the oxygen absorber.

[0021] Preferably, the sodium salt solution is a mixture of sodium sulfite, sodium acetate and pure water in a weight ratio of 2:3:(8 to 10).

[0022] The above technical solution can further activate the activity of bentonite, allowing it to better combine with oxygen-scavenging components such as iron powder and activated carbon to form a more efficient oxygen-scavenging system, thereby improving oxygen scavenging efficiency. At the same time, sodium sulfite, as a reducing agent, can react with oxygen to consume the oxygen inside the package, creating a lower-oxygen environment for food. Sodium acetate, as a buffer, can maintain the acid-base balance inside the oxygen absorber, preventing changes in acid-base level from affecting the oxygen-scavenging effect.

[0023] Preferably, the polymer powder comprises at least one of starch, xanthan gum, and polylactic acid hydroxyacetate. Starch, xanthan gum, and polylactic acid hydroxyacetate have good adhesive and film-forming properties, forming a stable film on the oxygen absorber and tightly binding raw materials such as modified short fiber, bentonite, and iron powder, thereby reinforcing the overall structural strength of the oxygen absorber. Such a stable structure helps prevent the oxygen absorber from breaking down or becoming layered during use and ensures its long-term effectiveness.

[0024] Preferably, the short fibers are a mixture of A short fibers and B short fibers in a weight ratio of 1:(0.8 to 1.2), The A short fiber is at least one of wood fiber, polylactic acid fiber, or alginate fiber, B staple fiber is a viscose fiber.

[0025] A short fiber usually has relatively good biodegradability, moisture absorption and strength, while B short fiber (viscose fiber) has good flexibility and processability. By optimizing the ratio of both, a more balanced and stable oxygen scavenger structure can be formed, thereby improving its overall performance.

[0026] Preferably, the activated carbon has an average particle size of 100 to 300 nm.

[0027] By adopting the above technical solution, the average particle size of the activated carbon can be optimized, which helps to form a more compact and uniform structure and enhances the stability of the oxygen absorber as a whole. At the same time, the activated carbon particles with a relatively small particle size are less likely to be worn or broken during production and use, thereby extending the life of the oxygen absorber. And it also ensures that the card-type oxygen absorber has a good oxygen absorbing speed.

[0028] According to a second aspect, the present application provides a card-type oxygen absorber, which adopts the following technical solution:

[0029] In the card-type oxygen absorber produced by the method for producing a card-type oxygen absorber according to the first aspect of the present application, the thickness of the card-type oxygen absorber is 0.5 to 1.5 mm.

[0030] By adopting the above technical solution, the thickness of the card-type oxygen absorber can be optimized to respond more quickly to changes in the oxygen concentration inside the package, quickly absorb and remove oxygen, and effectively extend the shelf life of food. At the same time, the relatively thin oxygen absorber layer reduces the overall weight, which helps reduce transportation costs. [Effects of the Invention]

[0031] From the above, the present application has the following beneficial effects.

[0032] 1. High oxygen absorption efficiency: This card-type oxygen absorber uses a special manufacturing process to evenly distribute active ingredients such as iron powder and activated carbon in a matrix formed by high molecular weight polymer and bentonite, increasing the contact area with oxygen and improving oxygen absorption efficiency.

[0033] 2. Dust control: Compared with powdered oxygen absorbers, card-type oxygen absorbers do not generate a large amount of dust during production and use, which is beneficial to protecting the health of workers and maintaining the cleanliness of the product and the production environment.

[0034] 3. Enhanced mechanical properties: The combination of high molecular weight polymer, bentonite and short fiber gives the card-type oxygen absorber good mechanical properties, such as toughness, strength and tear resistance, making it less likely to break during use and easier to cut and package, improving the practicality and durability of the product. DETAILED DESCRIPTION OF THE INVENTION

[0035] The wood fiber was purchased from Changzhou Longheng Building Materials Technology Co., Ltd. and was of industrial grade A.

[0036] The starch was purchased from Changzhou Longheng Building Materials Technology Co., Ltd. and had a relative molecular mass of 600.

[0037] The viscose fiber was purchased from Shandong Fuhui Textile Technology Co., Ltd. and had a wet breaking strength of 1.05 CN / dtex.

[0038] Example 1 Card-type oxygen absorbers are S1: Mix 320 g of high molecular weight polymer powder (starch) with 1000 g of purified water, heat in a water bath, and stir uniformly to obtain an environmentally friendly translucent colloid; S2: 120 g of environmentally friendly colloid and bentonite, and 150 g of short fibers (wood fibers) are uniformly stirred to obtain a clay mixture; S3: Add 900 g of iron powder, 180 g of activated carbon (average particle size 100-150 nm), and 20 g of edible salt to the clay mixture and stir uniformly to obtain mixture A; S4: Mixture A is placed between two layers of release film, and rolled repeatedly through several rolls until a predetermined thickness is reached, at which point the upper film is peeled off to obtain a wet sheet; The wet sheet is fixed and molded, and then completely dehydrated using a hot air process. The hot air temperature is adjusted to a gradient of 80 to 120°C, with 10°C intervals, the drying time at each temperature is 5 minutes, and the air speed is 3 m / s, to obtain a dry sheet. The dry sheet was cut, rewetted with salt water, and sealed to obtain a card-type oxygen absorber, S6, with a thickness of 0.5 mm.

[0039] The concentration of the salt water was 7%, and the salt water content in the wet card-type oxygen absorber after rewetting with salt water was 20%.

[0040] Examples 2 and 3 differ from Example 1 in the amounts of the raw materials used to manufacture the curd-type oxygen absorber and in the experimental parameters. Specific differences are shown in Table 1.

[0041] Table 1: The amounts of raw materials used and experimental parameters for producing the curd-type oxygen absorber in Examples 1 to 3 [Table 1]

[0042] Example 4 This is a card-type oxygen absorber. The difference between this example and Example 1 is that the short fibers are modified short fibers. Method A: Mix 150g of short fibers (wood fiber) with 200g of ethanol solution (volume concentration 50%), stir at 100r / min, adjust the pH to 8 with ammonia water, heat to 50°C, add 20g of titanate ester coupling agent and 20g of ethyl cellulose, and keep warm for 60min. After the incubation, the mixture was cooled to room temperature and filtered under suction. The resulting cake was washed with absolute ethanol and deionized water, and then dried in a drying box at 105°C until it reached a constant weight. This produced modified short fibers using Method B.

[0043] Examples 5 and 6 differ from Example 4 in that the amounts of the raw materials used to produce the modified short fibers and the experimental parameters are different. Specific differences are shown in Table 2.

[0044] Table 2: Types of raw materials used and amounts used to produce modified short fibers in Examples 4 to 6 and experimental parameters [Table 2]

[0045] Example 7 This is a card-type oxygen absorber. The difference between this embodiment and Example 1 is that the bentonite is pretreated before step S2, which is The bentonite was crushed and passed through a 300 mesh sieve, then added to the sodium salt solution, stirred for 1 hour, filtered, and the residue was removed and dried to obtain the pretreated bentonite.

[0046] The sodium salt solution was prepared by mixing sodium sulfite, sodium acetate and pure water in a weight ratio of 2:3:8.

[0047] Example 8 This is a card-type oxygen absorber. The difference between this example and Example 4 is that the bentonite is pretreated before step S2, and the steps are as follows: The bentonite was crushed and passed through a 500 mesh sieve, then added to the sodium salt solution, stirred for 2 hours, filtered, and the residue was collected and dried to obtain the pretreated bentonite.

[0048] The sodium salt solution was prepared by mixing sodium sulfite, sodium acetate and pure water in a weight ratio of 2:3:10.

[0049] Example 9 This example is a card-type oxygen absorber, and the difference between this example and Example 1 is that the short fibers are a mixture of A short fibers and B short fibers in a weight ratio of 1:0.8. A short fiber is wood fiber, B staple fiber is a viscose fiber.

[0050] Example 10 This example is a card-type oxygen absorber. The difference between this example and Example 8 is that the short fibers are a mixture of A short fibers and B short fibers in a weight ratio of 1:1. A short fiber is wood fiber, B staple fiber is a viscose fiber.

[0051] Comparative Example Comparative Example 1 This comparative example is a card-type oxygen absorber, and differs from Example 1 in that the dehydration treatment is not carried out in step S5.

[0052] Comparative Example 2 This comparative example is a card-type oxygen absorber, and differs from Example 1 in that silica is used instead of activated carbon.

[0053] Comparative Example 3 This comparative example is a card-type oxygen absorber, and differs from Example 1 in that silica is used instead of short fibers.

[0054] Comparative Example 4 This comparative example is a card-type oxygen absorber, and differs from Example 1 in that magnesium oxide is used instead of bentonite.

[0055] Comparative Example 5 This comparative example is a card-type oxygen absorber, and differs from Example 1 in that pure water is used instead of salt water in step S6.

[0056] Performance Detection Test The card-type oxygen absorbers produced in the Examples and Production Examples were subjected to tests for the actual total oxygen absorption amount, oxygen absorption rate, oxygen concentration in a sealed package, and structural stability.

[0057] Detection / Testing Methods Actual total oxygen absorption, oxygen absorption rate, and oxygen concentration in sealed packaging: In accordance with GB / T 41896-2022, "Quality Requirements for Food Oxygen Absorbers," white oil was used as the carrier. 25mm x 30mm x 0.5mm wet card samples were prepared and packaged in industry-standard dustproof film into card-type oxygen absorbers measuring 35mm x 40mm and weighing 1.4±0.1g.

[0058] Structural stability test: A 25mm x 30mm x 0.5mm wet card sample was prepared and weighed. It was then placed on a rocking machine and rocked for 1 minute. The wet card was then removed and reweighed. The weight change of the wet card was calculated. The experimental data are shown in Table 3.

[0059] Table 3 Experimental data of Examples 1 to 10 and Comparative Examples 1 to 5 [Table 3]

[0060] Comparing Example 1 and Comparative Example 1, the actual total oxygen absorption amount and oxygen absorption rate in Comparative Example 1 were both lower than those of the Examples, the oxygen concentration in the sealed package was higher than that of Example 1, and the weight change after the structural stability test was larger than that of Example 1. This shows that the dehydration effect and structural stability of the card-type oxygen absorber can be improved by complete dehydration treatment.

[0061] Comparing Example 1 with Comparative Example 1, the actual total oxygen absorption amount and oxygen absorption rate in Comparative Examples 2 to 4 are all inferior to those of the Example, the oxygen concentration in the sealed package is greater than that of Example 1, and the weight change after the structural stability test is greater than that of Example 1. This shows that the oxygen absorbing effect and structural stability of the card-type oxygen absorber can be improved by using activated carbon, short fiber, and bentonite in combination with other raw materials.

[0062] Comparing Example 1 and Comparative Example 5, the actual total oxygen absorption amount and oxygen absorption rate in Comparative Example 5 were both lower than those of the Examples, the oxygen concentration in the sealed package was higher than that of Example 1, and the weight change after the structural stability test was larger than that of Example 1. This shows that the salt water rewetting treatment can improve the oxygen absorbing effect and structural stability of the card-type oxygen absorber.

[0063] Comparing Example 1 with Examples 4 to 6, the actual total oxygen absorption amount and oxygen absorption rate in Examples 4 to 6 were all greater than those in Example 1, the oxygen concentration in the sealed package was lower than that in Example 1, and the weight change after the structural stability test was greater than that in Example 1. This shows that by producing modified short fibers using the manufacturing method of the present application, the oxygen absorbing effect and structural stability of the carded oxygen absorber can be improved.

[0064] Comparing Example 1 and Example 7, the actual total oxygen intake amount and oxygen intake rate in Example 7 were both greater than those in Example 1, the oxygen concentration in the sealed package was lower than that in Example 1, and the weight change after the structural stability test was greater than that in Example 1.

[0065] Comparing Example 4 and Example 8, the actual total oxygen intake amount and oxygen intake rate in Example 8 were both greater than those in the Examples, the oxygen concentration in the sealed package was lower than that in Example 4, and the weight change after the structural stability test was greater than that in Example 4.

[0066] As is clear from the experimental results of Examples 1, 7, 4 and 8, the oxygen absorbing effect and structural stability of the card-type oxygen absorber can be improved by pretreating the bentonite.

[0067] Comparing Example 1 and Example 9, the actual total oxygen intake amount and oxygen intake rate in Example 9 were both greater than those in the Examples, the oxygen concentration in the sealed package was lower than that in Example 1, and the weight change after the structural stability test was greater than that in the Examples.

[0068] Comparing Example 8 and Example 10, the actual total oxygen intake amount and oxygen intake rate in Example 10 were both greater than those in the other examples, the oxygen concentration in the sealed package was lower than that in Example 8, and the weight change after the structural stability test was greater than that in Example 8.

[0069] As is clear from the experimental results of Examples 1, 9, 8 and 10, the oxygen absorbing effect and structural stability of the card-type oxygen absorber can be improved by using a mixture of wood fiber and viscose fiber.

[0070] The specific examples are merely an interpretation of the present application and are not limitations on the present application. Those skilled in the art may make modifications to the present examples as necessary after reading this specification, without making any creative contribution thereto, but they will be protected by patent law as long as they are within the scope of the claims of the present application.

Claims

1. A method for producing a card-type oxygen absorber, comprising: Step S1: Mixing high molecular weight polymer powder with purified water, heating in a water bath, and stirring uniformly to obtain a translucent colloid; Step S2: uniformly stirring the colloid, bentonite, and short fibers to obtain a clay mixture; Step S3: adding iron powder, activated carbon, and edible salt to the clay mixture and stirring uniformly to obtain mixture A; Step S4: Place the mixture A between two layers of release film, roll it through several rolls repeatedly, and after it reaches a predetermined thickness, peel off the upper film to obtain a wet sheet; Step S5: The wet sheet is fixed and molded, and then completely dehydrated by a hot air process to obtain a dry sheet; and step S6 of cutting the dry sheet, rewetting it with salt water, and sealing it to obtain a card-type oxygen absorber. The raw materials for producing the card-type oxygen absorber are, in parts by weight: 32 to 50 parts of high molecular weight polymer powder, 100 to 142 parts of purified water, 12-25 parts bentonite, 15 to 30 parts short fibers, 90 to 150 parts iron powder, 18 to 32 parts of activated carbon, 2 to 4 parts of edible salt.

2. The staple fibers are modified staple fibers, Method A: Mixing short fibers with an ethanol solution, stirring at 100-120 r / min, adjusting the pH to 8-9 with aqueous ammonia, heating to 50-60°C, adding a titanate ester coupling agent and ethyl cellulose, and keeping the temperature for 60-80 min; 2. The method for producing the card-type oxygen absorber according to claim 1, wherein after the incubation, the mixture is cooled to room temperature, suction filtered, and the resulting cake is washed with absolute ethanol and deionized water, respectively, and then dried in a drying box at 100 to 105°C until a constant weight is reached, thereby obtaining modified short fibers.

3. The raw materials for producing modified short fibers are, in parts by weight: 15 to 30 parts short fibers, 20 to 40 parts of ethanol solution, 4 to 8 parts aqueous ammonia, 2 to 3 parts titanate coupling agent, 3. The method for producing a card-type oxygen absorber according to claim 2, wherein the amount of ethyl cellulose is 2 to 4 parts.

4. The bentonite is pretreated before step S2, and the pretreatment step includes:

2. The method for producing the card-type oxygen absorber according to claim 1, wherein the bentonite is crushed, sieved through a 300 to 500 mesh sieve, added to a sodium salt solution, stirred for 1 to 2 hours, filtered, the filtration residue is removed, and dried to obtain pretreated bentonite.

5. 5. The method for producing a card-type oxygen absorber according to claim 4, wherein the sodium salt solution is a mixture of sodium sulfite, sodium acetate and pure water in a weight ratio of 2:3:(8-10).

6. 2. The method for producing a card-type oxygen absorber according to claim 1, wherein the polymer powder includes at least one of starch, xanthan gum, and polylactic acid hydroxyacetic acid.

7. The short fibers are a mixture of A short fibers and B short fibers in a weight ratio of 1:(0.8 to 1.2), The A short fibers are at least one of wood fibers, polylactic acid fibers, and alginate fibers, 2. The method for producing a card-type oxygen absorber according to claim 1, wherein the B short fibers are viscose fibers.

8. 2. The method for producing a card-type oxygen absorber according to claim 1, wherein the activated carbon has an average particle size of 100 to 300 nm.

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