Edible oil deterioration prevention filter, deterioration prevention agent composition, and method for producing the same

Abstract

To provide an edible oil degradation inhibition filter that has excellent oxidation degradation inhibition performance and that hardly causes clogging because filterability is proper.SOLUTION: An edible oil degradation inhibition filter 10 comprises a degradation inhibition composition 1 containing an edible oil degradation inhibitor and a binder, and a filter medium 2 having a pore. The degradation inhibition composition 1 adheres to at least one of a surface of the filter medium 2 and an inner surface of the pore by the binder. The porosity of the filter medium 2 is 50 vol.% or more, and the diameter of the pore is 30 μm or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a filter for inhibiting deterioration of edible oil and a method for producing the same. [Background technology]

[0002] Edible oils are used in a variety of foods, but edible oils used to cook deep-fried foods such as tempura and fries oxidize and deteriorate when heated or left to stand during cooking, which deteriorates the taste, odor, and appearance of the food, so edible oils that have oxidized and deteriorated beyond a certain standard are discarded. From the perspective of protecting the global environment, it is desirable to slow down the oxidative deterioration of edible oils even a little and reduce the number of times that edible oil is discarded. In addition, by reducing the number of times that edible oil is discarded, there is also the benefit of reducing the number of times that deep-frying cooking equipment (fryer) used for deep-frying foods needs to be cleaned, and the amount of water used for cleaning.

[0003] For example, Patent Document 1 discloses a filtering material (filter) that filters and regenerates used, oxidized and deteriorated edible oil by passing it through the material. This filter is constructed by filling a granular regenerating agent into a sealed case made of filter cloth or filter paper. However, the filter disclosed in Patent Document 1 is relatively thick, and therefore the pressure loss during filtration is likely to be large, and the pump for circulating the edible oil is relatively large, leaving room for improvement. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-52627 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide an edible oil degradation inhibition filter that has excellent oxidative degradation inhibition performance, good filtration properties, and can reduce energy consumption due to pressure loss, as well as a degradation inhibitor composition, and methods for producing the same. [Means for solving the problem]

[0006] The edible oil deterioration inhibition filter according to one embodiment of the present invention comprises a deterioration inhibition composition containing an edible oil deterioration inhibitor and a binder, and a filter material having fine holes with a porosity of 50% by volume or more and a pore diameter of 30 μm or more, and the deterioration inhibitor is adhered by the binder to at least one or both of the surface of the filter material and the inner surfaces of the pores, which are the parts that come into contact with the edible oil to be filtered. A method for producing an edible oil deterioration inhibition filter according to another aspect of the present invention is a method for producing an edible oil deterioration inhibition filter according to the above-mentioned aspect, and is characterized by comprising an attachment step of attaching a deterioration inhibition composition to at least one or both of the surface of the filter material and the inner surfaces of the pores by a dropping method, a roll coater method, an immersion method, or a spray coating method. Another aspect of the present invention provides an edible oil deterioration inhibiting composition comprising a deterioration inhibitor and a binder. Effect of the Invention

[0007] According to the present invention, it is possible to provide an edible oil degradation inhibition filter and a degradation inhibitor composition that have excellent oxidative degradation inhibition performance, good filtration properties, and can reduce energy consumption due to pressure loss, as well as methods for producing the same. [Brief description of the drawings]

[0008] [Figure 1] 1 is an enlarged view showing a schematic example of the structure of an edible oil deterioration prevention filter according to the present invention. FIG. [Diagram 2] 1 is a conceptual diagram of a processing device illustrating a method for filtering edible oil and inhibiting oxidative degradation using an edible oil deterioration inhibition filter according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the present invention will be described below. Note that this embodiment is merely an example of the present invention, and the present invention is not limited to this embodiment. In addition, various modifications and improvements can be made to this embodiment, and such modifications and improvements can also be included in the present invention. First, an example of an edible oil deterioration inhibiting filter according to the present invention will be described with reference to Fig. 1. The edible oil deterioration inhibiting filter 10 in Fig. 1 includes a deterioration inhibiting composition 1 containing an edible oil deterioration inhibitor and a binder, and a filter medium 2 having pores 2a. The deterioration inhibiting composition 1 is attached to at least one of the surface of the filter medium 2 and the inner surface of the pores 2a by the binder. In Fig. 1, the deterioration inhibiting composition 1 attached to the surface of the filter medium 2 and the inner surface of the pores 2a is depicted in a schematic manner.

[0010] The edible oil deterioration inhibitor has an oxidative deterioration inhibitory property, and inhibits the oxidative deterioration of edible oil by contacting with the edible oil. Examples of the edible oil deterioration inhibitor include tartrates such as potassium hydrogen tartrate. Although it is preferable to use a tartrate alone as the edible oil deterioration inhibitor, a mixture of a tartrate with another substance can also be used as the edible oil deterioration inhibitor. The other substances are preferably harmless to the human body, and an example thereof is calcium oxide.

[0011] The binder is used to attach the edible oil deterioration inhibitor to the filter medium 2, and is preferably harmless to the human body. An example of the binder is an adhesive. Examples of the adhesive include natural adhesives such as starch, cellulose, and shellac resin (a resinous substance obtained by refining the secretions of scale insects), inorganic adhesives such as silicon-based adhesives (e.g., silicates) and calcium-based adhesives (e.g., cement and gypsum), and organic adhesives such as thermoplastic resins, thermosetting resins, and photosetting resins. These adhesives may be used alone or in combination of two or more.

[0012] The filter material 2 is not particularly limited as long as it has a plurality of pores 2a and allows the passage of edible oil, and examples thereof include a porous body and an aggregate of a plurality of fibers. Examples of the porous body include sintered metal and bisque. Examples of the aggregate of a plurality of fibers include woven fabric, nonwoven fabric, felt, paper, filter paper, net, etc.

[0013] The type of fiber is not particularly limited, and examples thereof include natural fibers, man-made fibers, synthetic resin fibers, metal fibers, glass fibers, carbon fibers, etc. Examples of natural fibers include wood, cotton, wool, hemp, silk, etc. Examples of man-made fibers include rayon, etc. Examples of synthetic resin fibers include polyester resin fibers, polyolefin resin fibers (e.g., polyethylene fibers, polypropylene fibers), polyamide resin fibers (e.g., polyamide 66 fibers), vinyl resin fibers, acrylic resin fibers, polyurethane resin fibers, etc. The aggregate of multiple fibers may be formed of one type of fiber, or may be formed of two or more types of fibers.

[0014] If a material with a proven track record of use in food applications (e.g., natural fibers) is used as the material for the filter medium 2, a food additive is used as the edible oil deterioration inhibitor, and a material that is harmless to the human body (e.g., a natural adhesive) is used as the binder, the edible oil deterioration inhibition filter 10 can be a filter that is harmless and safe to the human body. Such an edible oil deterioration inhibition filter 10 is suitable for installation in, for example, a fryer for deep-frying foods, for filtering impurities such as fried food residue, and for inhibiting the oxidative deterioration of edible oil.

[0015] Although there are no particular limitations on the average fiber length and average fiber diameter of the fibers forming the filter medium 2, a filter medium 2 in which the diameter of the pores 2a is larger than the particle size of the edible oil deterioration inhibitor is preferred in order to allow the deterioration inhibiting composition 1 to adhere to the inside of the pores 2a of the filter medium 2. If the diameter of the pores 2a of the filter medium 2 is smaller than the particle size of the edible oil deterioration inhibiting agent, the deterioration inhibiting composition 1 is less likely to adhere to the inner surfaces of the pores 2a of the filter medium 2.

[0016] The aggregate of multiple fibers has a structure in which multiple fibers are bonded together three-dimensionally by adhesive, heat bonding, or mechanical bonding, and forms a porous structure with voids inside. The porosity, diameter of the pores 2a, and density of the filter medium 2 having such a porous structure are indicators of the ease of passage of edible oil (degree of clogging). The pores 2a are holes in the filter medium 2 through which the edible oil passes. The porosity is the ratio of the volume of the voids due to the pores 2a in the filter medium 2. Furthermore, the density is the mass of the filter medium 2 divided by the volume of the filter medium 2.

[0017] The porosity of the filter medium 2 is 50% by volume or more, preferably 68% by volume or more, and more preferably 80% by volume or more. The diameter of the pores 2a is 30 μm or more, preferably 35 μm or more, and more preferably 100 μm or more. The density of the filter medium 2 is 0.33 g / cm 3 It is preferable that the porosity, the diameter of the pores 2a, and the density are within the above-mentioned numerical ranges, the pores 2a are not easily clogged even when the deterioration-inhibiting composition 1 is attached to the filter material 2, so that the pressure difference (pressure loss) of the edible oil before and after passing through the edible oil deterioration-inhibiting filter 10 is small (initial filterability is excellent). Therefore, the pump that delivers the edible oil is not easily loaded. In addition, the pores are not easily clogged by impurities such as fried food residue contained in the edible oil, so that the edible oil deterioration-inhibiting filter 10 is not easily clogged early. Furthermore, if the diameter of the pores 2a is within the above-mentioned numerical ranges, the deterioration-inhibiting composition 1 is easily attached to the inner surface of the pores 2a of the filter material 2.

[0018] The thickness of the filter medium 2 is not particularly limited, but is preferably 1 mm to 10 mm, more preferably 1 mm to 5 mm, and even more preferably 1 mm to 4 mm. If the thickness of the filter medium 2 is within the above-mentioned numerical range, the pores are less likely to be clogged by impurities such as fried food residue contained in the edible oil, and the pressure difference of the edible oil before and after passing through the edible oil deterioration inhibition filter 10 is reduced. In this way, by using the filter medium 2 having the porosity, the diameter of the pores 2a, the density, and the thickness within the above-mentioned numerical ranges, it is possible to prevent the initial deterioration of the filtering property and early clogging of the edible oil deterioration inhibition filter 10. The porosity and the diameter of the pores 2a can be measured using a mercury porosimeter that utilizes the principle of mercury intrusion porosimetry.

[0019] The edible oil deterioration inhibiting filter 10 as described above can be manufactured as follows. The method will be described with reference to FIG. 1. First, the edible oil deterioration inhibiting agent and the binder are mixed to obtain the deterioration inhibiting composition 1 (mixing step). If desired, other additives may be blended into the deterioration inhibiting composition 1. Examples of other additives include a foaming agent, a heat stabilizer, a plasticizer, an antioxidant, and an ultraviolet absorber. If a foaming agent is blended into the deterioration inhibiting composition 1, the deterioration inhibiting composition 1 attached to the filter medium 2 can be formed into a porous shape by foaming of the foaming agent. If the deterioration inhibiting composition 1 is porous, it is possible to prevent early clogging when the edible oil deterioration inhibiting filter 10 is used to filter edible oil. In addition, if there is too little binder, the edible oil deterioration inhibitor will be more likely to fall off, and if there is too much binder, there will be less opportunity for the edible oil deterioration inhibitor to come into contact with the edible oil to be filtered, which may prevent the inhibitor from fully exerting its ability to prevent oxidative deterioration.

[0020] Next, the deterioration-inhibiting composition 1 is attached to the filter medium 2 by a dropping method, a roll coater method, a dipping method, or a spray coating method (attaching step). In any of the methods, a liquid deterioration-inhibiting composition diluted to a predetermined concentration with a predetermined volatile or evaporative solvent can be used. In the attaching step, the deterioration-inhibiting composition 1 is attached to at least one of the surface of the filter medium 2 having pores 2a through which the edible oil to be filtered passes and the inner surface of the pores 2a. The dropping method is a method in which the deterioration-inhibiting composition 1 in a liquid form is dropped onto the filter medium 2 to attach the edible oil deterioration inhibitor to the filter medium 2 by a binder, and the roll coater method is a method in which the deterioration-inhibiting composition 1 is applied to the filter medium 2 by a rotating roll having the deterioration-inhibiting composition 1 on its surface, to attach the edible oil deterioration inhibitor to the filter medium 2 by a binder. In addition, the immersion method is a method in which the filter material 2 is immersed in a liquid deterioration inhibition composition 1 and then pulled out of the liquid deterioration inhibition composition 1, thereby adhering the edible oil deterioration inhibitor to the filter material 2 with the binder, and the spray coating method is a method in which the liquid deterioration inhibition composition 1 is sprayed onto the filter material 2, thereby adhering the edible oil deterioration inhibitor to the filter material 2 with the binder.

[0021] Since the deterioration-inhibiting composition 1 is attached to the filter medium 2 by a dropping method, a roll coater method, a dipping method, or a spray coating method, the attachment location and the attachment amount of the deterioration-inhibiting composition 1 can be easily controlled. Therefore, it is possible to easily manufacture an edible oil deterioration-inhibiting filter 10 that has excellent oxidative deterioration-inhibiting performance, good filtering properties, and is less likely to clog. The attachment step may be repeated multiple times to laminate multiple layers of the deterioration-inhibiting composition 1 on the filter medium 2.

[0022] The edible oil degradation inhibition filter 10 of this embodiment, which has the above-mentioned excellent performance, can be used for filtering edible oil and inhibiting its oxidative degradation. A method for filtering used edible oil and inhibiting its oxidative degradation using the edible oil degradation inhibition filter 10 will be described below with reference to FIG. 2. The processing device, which filters edible oil 20 that has been used in a fryer for deep-frying fried foods and has been oxidized and deteriorated, and inhibits oxidative deterioration, includes an oil tank 21 in which the edible oil 20 is stored, a circular pipe 22 through which the edible oil 20 is passed, a pump 24 for delivering the edible oil 20, and a processing unit 23 equipped with an edible oil deterioration inhibition filter 10 (not shown in FIG. 2) that filters the edible oil 20 and inhibits oxidative deterioration.

[0023] More specifically, the oil tank 21, pump 24, and treatment unit 23 are connected in series by a ring-shaped pipe 22, and the edible oil 20 in the oil tank 21 is pumped through the pipe 22 by the pump 24, filtered and inhibited from oxidative deterioration in the treatment unit 23, and then returned to the oil tank 21. Used edible oil 20 contains impurities such as fried debris and has also been oxidized, but by passing through the edible oil degradation inhibition filter 10 in the treatment unit 23, impurities such as fried debris are filtered out and the oxidative deterioration of the edible oil 20 is inhibited, slowing down the oxidation rate.

[0024] By treating the edible oil 20 while circulating it as described above, it is possible to continuously treat the edible oil 20 after it has been used for cooking, etc. Also, for example, by connecting a pipe 22 equipped with a pump 24 and a treatment unit 23 to an oil tank of a fryer for deep-frying foods, the edible oil 20 used for cooking can be treated in parallel with the cooking. When the oxidative degradation inhibition performance of the edible oil degradation inhibition filter 10 is reduced or lost, or when the filtering ability is reduced or when the filter becomes clogged and no longer allows liquid to pass through, the edible oil degradation inhibition filter 10 in the processing section 23 is replaced with a new one. The edible oil degradation inhibition filter 10 is easy to handle because it does not use powders such as filter aids. In addition, a normal fried residue collecting filter or the like can be further installed in front of or behind the edible oil deterioration prevention filter 10.

[0025] Here, a preferred embodiment of the edible oil deterioration inhibiting composition will be described. The edible oil deterioration inhibiting composition may be diluted before use in the adhesion step. However, if the binder contained in the edible oil deterioration inhibiting composition dissolves in edible oil, it will no longer function as a binder. Therefore, it is preferable that the binder has a low solubility in edible oil, but is soluble in the dilution solvent used in the adhesion step, and has no effect on the human body. In view of this, it is preferable to use a substance that has almost no solubility in edible oil and is soluble in alcohol-based substances as the binder. Specifically, it is preferable to use shellac resin, which can be said to be a natural adhesive, as the binder and dilute it with an alcohol-based solvent. As the alcohol-based solvent, it is preferable to use ethanol (ethyl alcohol), which has little effect on the human body and hardly remains due to volatilization and evaporation, as the dilution solvent.

[0026] [Example] The present invention will be described in more detail below with reference to examples and comparative examples. (Comparative Example 1-1) A cellulose filter paper that can be used as a food material was cut into a circle with a diameter of 90 mm to prepare the filter of Comparative Example 1-1. The thickness of this filter paper was 1.0 mm, and the density was 0.38 g / cm 3 In addition, the porosity and pore diameter of this filter paper were measured with a mercury porosimeter, and the porosity was 67% by volume and the pore diameter was 35 μm.

[0027] (Comparative Example 1-2) A mixture of potassium hydrogen tartrate and calcium oxide in a mass ratio of 1:1 was sprayed onto the filter of Comparative Example 1-1, and the mixture was placed on the filter paper to prepare the filter of Comparative Example 1-2. The amount of the mixture placed on the filter paper was 120 g / m 2 It is.

[0028] Comparative Example 2 A cellulose filter paper was cut into a circle with a diameter of 90 mm to prepare the filter of Comparative Example 2. The thickness of this filter paper was 2.8 mm and the density was 0.33 g / cm 3In addition, the porosity and pore diameter of this filter paper were measured with a mercury porosimeter, and the porosity was 68% by volume and the pore diameter was 35 μm.

[0029] (Reference example 1) A polyethylene terephthalate nonwoven fabric used as a food filter was cut into a circle with a diameter of 90 mm to prepare the filter of Reference Example 1. The thickness of this nonwoven fabric was 3.8 mm and the density was 0.09 g / cm. 3 The porosity and pore diameter of the nonwoven fabric were measured with a mercury porosimeter, but the values ​​were unknown because they were above the upper measurement limit of the mercury porosimeter. However, since the upper measurement limit of the porosity using a mercury porosimeter is 80% by volume and the upper measurement limit of the pore diameter is 100 μm, it can be said that the porosity of the nonwoven fabric is 80% by volume or more and the pore diameter is 100 μm or more.

[0030] Example 1 Shellac resin was dissolved in ethanol to obtain a shellac resin solution with a concentration of 7% by mass. A mixture of potassium hydrogen tartrate and calcium oxide in a mass ratio of 1:1 was added to this shellac resin solution as an edible oil deterioration inhibitor to prepare a deterioration inhibitor composition. The content of the edible oil deterioration inhibitor in the liquid deterioration inhibitor composition was 5% by mass. The ratio of the deterioration inhibitor to the binder was 1:1.4 by mass.

[0031] The filter of Reference Example 1 was used as a filter medium, and the above liquid deterioration-suppressing composition was applied to the filter medium by a dropwise method. The amount of deterioration-suppressing composition applied to the filter was about 340 g / m 2 The deterioration-inhibiting composition was then dried using hot air at 60° C. to obtain the filter of Example 1. The filter of Example 1 had a thickness of 3.8 mm and a density of 0.18 g / cm. 3 (The density of the filter medium is 0.09 g / cm 3 (It is.)

[0032] (Reference example 2) A cellulose filter paper that can be used as a food material was cut into a circle with a diameter of 90 mm to prepare the filter of Reference Example 2. The thickness of this filter paper was 1.9 mm and the density was 0.24 g / cm. 3 In addition, the porosity and pore diameter of this filter paper were measured with a mercury porosimeter, and the porosity was 79 volume % and the pore diameter was 54 μm.

[0033] Example 2 Shellac resin was dissolved in ethanol to obtain a shellac resin solution with a concentration of 1% by mass. A mixture of potassium hydrogen tartrate and calcium oxide in a mass ratio of 1:1 was added to the shellac resin solution as an edible oil deterioration inhibitor to prepare a liquid deterioration inhibitor composition. The content of the edible oil deterioration inhibitor in the liquid deterioration inhibitor composition was 10% by mass. The filter of Reference Example 2 was used as a filter medium, and the above liquid deterioration-suppressing composition was applied to the filter medium by a dropwise method. The amount of deterioration-suppressing composition applied to the filter was about 160 g / m 2 The deterioration-inhibiting composition was then dried using hot air at 60° C. to obtain a filter of Example 2. The filter of Example 2 had a thickness of 1.9 mm and a density of 0.33 g / cm. 3 (The density of the filter medium is 0.24 g / cm 3 (It is.)

[0034] (Reference example 3) A cellulose filter paper that can be used as a food material was cut into a circle with a diameter of 90 mm to prepare the filter of Reference Example 3. The thickness of this filter paper was 1.4 mm and the density was 0.30 g / cm. 3 In addition, the porosity and pore diameter of this filter paper were measured with a mercury porosimeter, and the porosity was 74 vol.% and the pore diameter was 50 μm.

[0035] (Reference example 4) A cellulose filter paper that can be used as a food material was cut into a circle with a diameter of 90 mm to prepare the filter of Reference Example 4. The thickness of this filter paper was 1.0 mm and the density was 0.31 g / cm. 3In addition, the porosity and pore diameter of this filter paper were measured with a mercury porosimeter, and the porosity was 73 vol.% and the pore diameter was 36 μm.

[0036] Next, an evaluation test was conducted on each of the above filters. For the evaluation test, a filtration device having the same configuration as the processing device shown in FIG. 2 was used. The method for evaluating the filterability of the filter is described below. The filterability of the filter was evaluated based on the initial filterability and the filterability after long-term filtration at high temperature.

[0037] First, a method for evaluating the initial filterability of the filter will be described. The filter was loaded into the processing section of the filtration device, and 8 L of edible oil ("Nissin Canola Oil" manufactured by Nisshin Oillio Group, Inc.) was placed in the oil tank. The edible oil heated to 100°C was pumped and filtered through the filter in the processing section. At this time, the pressure of the edible oil on the upstream and downstream sides of the filter was measured with a pressure gauge, and the flow rate of the edible oil on the downstream side of the filter was measured with a flow meter.

[0038] The flow rate of the edible oil was then varied, the pressure of the edible oil was measured at each flow rate, and the pressure loss of the edible oil (the pressure difference between the upstream and downstream sides of the filter) at each flow rate was calculated. The data obtained was then plotted on an XY coordinate system with the flow rate on the X axis and the pressure difference on the Y axis to derive an approximate straight line Y=aX+b, and the initial filterability was evaluated based on the magnitude of the slope a. Note that the smaller the slope a, the better the filterability of the filter.

[0039] Next, a method for evaluating the filterability of a filter after long-term filtration at high temperature will be described. As in the evaluation method of initial filterability, a filter was loaded into the processing section of a filtration device, and 8 L of edible oil was placed in an oil tank. Edible oil heated to 180°C was pumped and filtered through the filter in the processing section. This filtration was performed for 96 hours while circulating the edible oil. After 96 hours of filtration, the pressure of the edible oil on the upstream and downstream sides of the filter was measured with a pressure gauge, and the pressure loss of the edible oil was calculated. The filterability after 96 hours of filtration was evaluated based on the magnitude of this pressure loss.

[0040] The results are shown in Table 1. The initial filterability is shown as a relative value when the filterability (slope a) of Comparative Example 1-1 is set to 1. The filterability after 96 hours of filtration is shown as a relative value when the filterability (pressure loss) of Comparative Example 1-1 is set to 1.

[0041] Next, a method for evaluating the oxidative degradation inhibitory performance of the filter will be described. After 96 hours of filtration in the same manner as in the evaluation method of filterability after 96 hours of filtration, the edible oil was sampled and its acid value was measured. The acid value of the edible oil was measured using a potentiometric titration method in accordance with JIS K2501. The results are shown in Table 1. The oxidative degradation inhibitory performance is shown as a relative value when the oxidative degradation inhibitory performance (acid value) of Comparative Example 1-1 is set to 1. [Table 1]

[0042] Comparison between Comparative Example 1-1 and Comparative Example 1-2 shows that in a filter medium having physical properties (thickness, density, porosity, and pore diameter) shown in Table 1, when a mixture of potassium hydrogen tartrate and calcium oxide is sprayed onto the filter medium, the initial filterability is reduced. Comparison between Comparative Example 1-2 and Reference Example 1 and Example 1 shows that the filter of Comparative Example 1-2 is prone to clogging, and the filterability after 96 hours of filtration is greatly reduced.

[0043] On the other hand, from the comparison between Reference Example 1 and Example 1, and from the comparison between Reference Example 2 and Example 2, it can be seen that in a filter medium having physical properties (thickness, density, porosity, and pore diameter) as shown in Table 1, even if a deterioration-suppressing composition is attached to the filter medium, the initial filterability is good. Also, from the comparison between Reference Example 1, Example 1, Comparative Example 1-1, and Comparative Example 1-2, it can be seen that in Reference Example 1 and Example 1, the filter is less likely to clog, and the filterability after 96 hours of filtration is good. That is, if a filter is manufactured by attaching a deterioration-suppressing composition to a filter medium having better initial filterability than Comparative Example 1-1, a filter that is less likely to clog can be obtained.

[0044] Next, a comparison of Reference Example 1 with Example 1 and Comparative Example 1-1 shows that a filter with excellent oxidative degradation suppression performance can be obtained by adhering a degradation suppression composition to a filter medium.

[0045] As mentioned above, the thickness is 1 mm or more and 10 mm or less, and the density is 0.33 g / cm 3 The following filter, in which the deterioration-inhibiting composition is applied to a filter medium having a porosity of 50% by volume or more and a pore diameter of 30 μm or more, has good initial filterability and filterability after 96 hours of filtration, and also has excellent oxidation deterioration inhibition performance. According to the examples, it exhibits excellent performance even at thicknesses of 3.8 mm and 1.9 mm, which are 4 mm or less. Furthermore, since shellac resin is used as a binder, it is a filter that is harmless to the human body. [Explanation of symbols]

[0046] 1 Deterioration inhibiting composition 2 Filter media 2a Pore 10. Cooking oil deterioration prevention filter 20 Edible oil 23 Processing section

Claims

1. The present invention comprises a deterioration-inhibiting composition containing an edible oil deterioration inhibitor and a binder, and a filter medium having fine holes, The deterioration-inhibiting composition is attached to at least one of the surface of the filter medium and the inner surfaces of the pores by the binder, The porosity of the filter medium is 50% by volume or more, the density of the filter medium is 0.24 g / cm 3 or less, and the diameter of the pores is 30 μm or more; A cooking oil deterioration prevention filter, wherein the diameter of the pores is larger than the particle size of the cooking oil deterioration prevention agent.

2. 2. The edible oil deterioration inhibitor filter according to claim 1, wherein the edible oil deterioration inhibitor contains a tartrate.

3. 3. The edible oil deterioration prevention filter according to claim 1, wherein the binder is a shellac resin.

4. The edible oil deterioration prevention filter according to any one of claims 1 to 3, wherein the thickness of the filter material is 1 mm or more and 10 mm or less.

5. 5. The edible oil deterioration prevention filter according to claim 1, wherein the density of the filter medium is 0.09 g / cm 3 or more and 0.24 g / cm 3 or less.

6. A method for producing the edible oil deterioration inhibition filter according to any one of claims 1 to 5, A method for producing an edible oil deterioration inhibition filter, comprising a step of applying the deterioration inhibition composition to at least one of the surface of the filter medium and the inner surfaces of the pores by a dropping method, a roll coater method, an immersion method, or a spray coating method.

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