JP2020032413A - Oil deterioration inhibition filter - Google Patents

Abstract

To provide an oil filter which can prevent outflow of a housed deterioration inhibitor and has good oil filterability.SOLUTION: An oil filter 11 includes: a deterioration inhibitor 12 which inhibits deterioration of oil; and a filter body 14 comprising a pair of sheets 13, 13 sandwiching the deterioration inhibitor 12. The filter body 14 is provided with: a closing part 15 for keeping the deterioration inhibitor 12 therein; and an oil passage hole 16 for passing the oil.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a filter for suppressing deterioration of oil, and more particularly to a technique which is effective when applied to a filter for suppressing deterioration of edible oil.

  Edible oil (hereinafter, also referred to simply as "oil") is used in various foods, but deteriorates due to heating during cooking such as tempura or fried food, or leaving it unattended, and deteriorates the taste, smell, and appearance of the food. Let it. In some cases, deterioration of the edible oil may cause food poisoning. Therefore, it is necessary to appropriately determine the degree of deterioration by using an index such as an acid value or a peroxide value, and to replace the edible oil with new edible oil at an appropriate timing.

  However, in a delicatessen shop that prepares tempura and fries, and in a delicatessen corner of supermarkets, the shorter the replacement cycle, the more the deterioration of cooking oil can be prevented, but there is a problem that the price of prepared food after cooking will increase. . In addition, edible oil that has deteriorated beyond a predetermined standard will be discarded. However, from the viewpoint of global environmental protection, there is a concern about the effect of the discarded oil on the environment. Therefore, it is desired to delay the deterioration of the edible oil as much as possible, thereby extending the oil replacement cycle as much as possible, and reducing the number of times of discarding the oil.

  As a technique for suppressing such deterioration of edible oil, for example, a method for regenerating edible oil using a filter as described in Patent Document 1 has been proposed. FIG. 8 shows a filtering device 101 using the filter 111 described in Patent Document 1. The used cooking oil stored in the fryer 102 is sent to the oil tank 108 through the first liquid feeding pipe 104, and is filtered through the filtering unit 110.

  The filtering unit 110 includes a regeneration filter 111 and a metal mesh 120. The oil accumulated in the lower part of the oil tank 108 after passing through the filtration unit 110 is sent to the circulation pump 103 through the second liquid sending pipe 105. After the oil exiting the circulation pump 103 passes through the valve 109, one is sent to the oil tank 108 through the third liquid sending pipe 106, and the other is sent to the fryer 102 through the fourth liquid sending pipe 107. Regardless of which route is taken, it is described that the oil is filtered by the filtration unit 110 including the filter 111, and the used oil is regenerated.

  9A is a plan view of a filter 111 used in the filtering device 101 shown in FIG. 8, and FIG. 9B is a cross-sectional view of FIG. 9A. The filter 111 is composed of a resin fiber sheet 114 in which the periphery of the two fiber sheets 113 is sealed to form a bag, and a particle filling section 112 filled with composite oxide particles.

  However, when using such a filter 111, the size of the pores (gap between fibers) of the fiber sheets 113, 113 is set so that the composite oxide particles do not flow out of the bag-shaped resin fiber sheet 114 to the outside. Needs to be smaller than the particle size of the composite oxide particles contained in the composite oxide particles. As the size of the pores is reduced, the outflow of the composite oxide particles in the bag to the outside is suppressed, but clogging occurs when oily scales or the like that have passed through the metal mesh 120 adhere. It is also conceivable that the passing speed of the oil is reduced due to the small pores and the filtration speed is reduced.

  Patent Document 2 discloses an edible oil purifying filter in which an edible oil deterioration inhibitor is sandwiched between sheets having a filter action. However, the pores of the filter are smaller than the additive particle size because the deterioration inhibitor is carried in the filter. Then, when oily residue or the like passes, clogging may occur, or the passing speed of oil may decrease due to small pores, or the filtration speed may decrease.

JP 2006-088039 A JP 2018-002977 A

  The present invention has been made in view of the above-described circumstances, and provides a filter for edible oil that can prevent the stored deterioration inhibitor from leaking to the outside and has good oil filterability. With the goal.

The above object of the present invention is achieved by the following configurations.
(1); a deterioration suppressing agent for suppressing oil deterioration, and a filter main body composed of a pair of sheets sandwiching the deterioration suppressing agent, wherein the filter main body is used to confine the deterioration suppressing agent. A filter comprising: a closing portion; and an oil passage hole for allowing oil to pass therethrough.
(2) The filter according to (1), wherein the size of the oil passage hole is larger than the size of the pores of the filter body.
(3) The filter according to (2), wherein the filter body is made of a papermaking sheet, and the size of the oil passage hole is larger than the size of the pores of the papermaking sheet.
(4) The filter according to (2), wherein the filter body is made of a nonwoven fabric sheet, and the size of the oil passage hole is larger than the size of the pores of the nonwoven fabric sheet.
(5) The filter according to any one of (1) to (4), wherein the size of the oil passage hole is larger than the particle diameter of the deterioration inhibitor.
(6); The closing portion has a closing edge for closing the periphery of the deterioration suppressing agent, and a bag portion surrounded by the closing edge and containing the deterioration suppressing agent. The filter according to any one of the above (1) to (5), which is formed on the closing edge.
(7) The filter according to any one of (1) to (6), wherein a second filter for physical filtration is superimposed on at least one of the pair of sheets of the filter body.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to prevent the accommodated deterioration inhibitor from flowing out, the filter for oil with favorable oil filterability can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the edible oil filter to which the filter for edible oils of this invention is applied. It is an exploded perspective view and a perspective view of a first embodiment of a filter according to the present invention. 2A is a plan view of the first embodiment, and FIG. 2B is a cross-sectional view taken along line AA of FIG. It is a top view of a 2nd embodiment of the filter concerning the present invention. It is a top view of a 3rd embodiment of the filter concerning the present invention. It is a top view of a 4th embodiment of the filter concerning the present invention. It is sectional drawing of 5th Embodiment of the filter which concerns on this invention. It is a figure explaining an example of the conventional edible oil filtration device. FIG. 9 is a plan view and a cross-sectional view of a filter used in the filtration device of FIG. 8. FIG. 2 is a plan view of a first embodiment of the filter according to the present invention. FIG. 4 is a plan view of a second embodiment of the filter according to the present invention. FIG. 7 is a plan view of a third embodiment of the filter according to the present invention. FIG. 11 is a plan view of a fourth embodiment of the filter according to the present invention. It is a top view of a 5th example of a filter concerning the present invention. FIG. 13 is a plan view of a sixth embodiment of the filter according to the present invention. FIG. 13 is a plan view of a seventh embodiment of the filter according to the present invention. FIG. 14 is a plan view of an eighth embodiment of the filter according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<First embodiment>
FIG. 1 shows an apparatus for filtering edible oil to which the filter according to the present invention is applied. The filtering device 1 includes a fryer 2 for storing edible oil, a pump 3 for circulating the edible oil stored in the fryer 2 in the filtering device 1, and a filter 11 for filtering edible oil sent from the pump 3. have. A first oil passage 4 is connected between the fryer 2 and the pump 3, a second oil passage 5 is connected between the pump 3 and the filter 11, and a third oil passage is connected between the filter 11 and the fryer 2, The filter 11 according to the present invention is provided between the second oil passage 5 and the third oil passage 6.

FIG. 2 is an exploded perspective view and a perspective view of the filter 11, FIG. 3A is a plan view of the filter 11, and FIG. 3B is a cross-sectional view taken along the line AA of FIG. The filter in FIG. 3 shows a state in which the contour of the outer periphery of the filter in FIG. 2 is processed into a circle. The filter 11 has a deterioration suppressing agent 12 and a filter body 14 including a pair of sheets 13 and 13 for sandwiching the deterioration suppressing agent 12 therebetween.
The deterioration inhibitor 12 functions to suppress the deterioration of the edible oil by coming into contact with the edible oil, and for example, potassium hydrogen tartrate or calcium oxide is used.

  The filter body 14 is composed of a pair of sheets 13, 13 of a papermaking sheet, a nonwoven fabric sheet, or a resin fiber sheet, or a pair of sheets 13, 13 in which these various sheets are appropriately combined. The deterioration inhibitor 12 is interposed therebetween. The size of the gaps (pores) between the fibers constituting the papermaking sheet, the nonwoven fabric sheet, or the resin fiber sheet is determined by the size of the particles of the deterioration suppressing agent It is smaller than the diameter.

  In order to prevent the deterioration inhibitor 12 from flowing out of the filter main body 14 to the outside during the filtration of the cooking oil by the edible oil filtration device 1, the periphery of the deterioration inhibitor 12 is provided in the filter main body 14. It is closed by the closing portion 15 (see the sectional view of FIG. 3B). The exploded perspective view of FIG. 2 shows a state before the filter 11 closes the deterioration inhibitor 12 with the closing portion 15. As a method of closing the periphery of the deterioration suppressing agent 12 by the closing portion 15, for example, the deterioration suppressing agent 12 is sandwiched between single-sided heat-sealable nonwoven fabrics, and heat is applied to apply heat fusion. As another method, the closing portion may be formed by ultrasonic welding. In the case of a papermaking sheet, a closed portion may be formed by engaging and pressing paper fibers.

The filter body 14 is further provided with a circular oil passage hole 16. The oil passage hole 16 is preferably formed by forming the above-described closing portion and then punching the hole with a drilling machine. However, the closing portion may be formed using a pair of sheets in which oil passage holes are formed in advance.
The perspective view of the filter 11 of FIG. 2 shows a state after the closing / perforating processing. The size of the oil passage hole 16 is larger than the size of the pores of the filter body 14 described above. As a result, the edible oil passes through the oil passage hole 16 more easily than the deterioration inhibitor 12. The "size" in the case of the size of the oil passage hole or the size of the pore refers to the size of the area when viewed in a plan view.

  When such a filter 11 is used in the edible oil filtering device 1 shown in FIG. 1 described above, the oil passing through the filter 11 passes through both the oil passage hole 16 and the closing portion 15 sandwiching the deterioration inhibitor 12. Will do. Strictly speaking, the oil passing through the oil passage hole 16 is not necessarily filtered. However, if the oil stored in the fryer 2 is circulated and passed through the filter 11 several times, the same portion of the oil can be removed every time by devising the shape of the oil passage hole as in the embodiment described later. The probability of passing through the passage hole is significantly reduced, and most of the edible oil is filtered by the deterioration inhibitor 12.

When the edible oil passes through the filter 11, the deterioration inhibitor 12 is confined by the closing portion 15, so that it is prevented from flowing out of the filter main body 14 to the outside.
Further, since the oil passage hole 16 through which the edible oil can pass is formed, the filterability of the filter 11 is improved. In addition, the size of the pores of the filter main body 14 is restricted by the relationship with the size of the deterioration inhibitor 12, but, for example, by making the size of the oil passage hole 16 larger than the particle size of the deterioration inhibitor 12, The filterability of the filter 11 can be further improved.

<Second embodiment>
Next, a second embodiment will be described with reference to FIG. In the following description, the same components as those in the first embodiment are denoted by the same or similar reference numerals, and detailed description is omitted. FIG. 4 is a plan view of the filter 21 similar to FIG.
The difference from the first embodiment is that the shape of the oil passage hole 26 is triangular. With such a shape, even if the number of oil passage holes 26 is the same, the amount of oil passing through the oil passage holes 26 is limited, and the oil filtered by the deterioration inhibitor 12 (see FIG. 2). Can be increased. As in the present embodiment, the shape of the oil passage hole is devised (for example, a circular hole and a triangular hole are mixed at a predetermined ratio, or a different shape such as a diamond-shaped hole) to obtain The amount of oil passing through the passage hole and the amount of oil passing through the deterioration inhibitor can be adjusted.

<Third embodiment>
Next, a third embodiment will be described with reference to FIG. FIG. 5 is a plan view of the filter 31 similar to FIG. In this embodiment, only one oil passage hole 36 is formed at the center of the filter body 33. With this configuration, the amount of oil passing through the oil passage hole 36 can be reduced to a minimum, and the amount of oil filtered by the deterioration inhibitor 12 (see FIG. 2) can be increased.

<Fourth embodiment>
Next, a fourth embodiment will be described with reference to FIG. FIG. 6 is a plan view of the filter 41, similar to FIG. In the present embodiment, the closing portion 45 for trapping the deterioration suppressing agent 12 (see FIG. 2) has a closing edge 45a and a bag portion 45b surrounded by the closing edge 45a and containing the deterioration suppressing agent 12. are doing.

As in the above-described embodiments, the closing portion 45 does not perform the closing process on the entire surface of the filter main body 44, but only the closing edge 45a is closed (in the drawings, the closed portion is hatched for convenience). displayed). The closing edge 45a has a circular edge 45a1 extending in the circumferential direction at the peripheral edge of the filter main body 44, and a straight edge 45a2 extending in a cross shape at the center of the filter main body 44. As a result, the bag portion 45b is divided into four regions 45b1, 45b2, 45b3, and 45b4.
The oil passage holes 46 are provided on the circular edge 45a1 and the straight edge 45a2 at predetermined intervals. With this configuration, it is possible to reliably perform the filtration by the deterioration inhibitor 12 (see FIG. 2) stored in the bag portion 45b while securing the amount of oil passing through the filter 41.

<Fifth embodiment>
Next, a fifth embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view of the filter 51, similar to FIG. In the present embodiment, the second filter 61 is overlaid on one sheet 13 of the filter body 14 of the first filter 11 which is the filter described in the first embodiment. That is, the filter 51 according to the fifth embodiment includes the filter 11 of the first embodiment as a first filter (first filter layer) 11A, and further includes one sheet of the filter body 14 of the first filter 11A. 13 is provided with a second filter (second filter layer) 61 superimposed on the second filter 13. The second filter 61 is made of a sheet of paper or a non-woven fabric, and performs a function of physical filtration that excludes passage of oil residue or the like. Therefore, the second filter 61 is not provided with an oil passage hole. The first filter 11A and the second filter 61 may be simply superposed, but may be integrated by bonding or the like.

  With such a configuration, the second filter 61 performs the physical filtration, and the first filter 11A performs the chemical filtration, so that the effect of suppressing the deterioration of the oil can be further improved. Note that the second filter 61 may be overlapped not only above the first filter 11A but also both above and below. That is, the second filter 61 may be sandwiched between the two first filters 11A. In this manner, when the filter 51 is attached to the edible oil filtering device 1 shown in FIG. 1, the mutual positional relationship between the first filter 11A and the second filter 61 with respect to the oil flowing direction (chemical (Physical filtration by the second filter 61 upstream of the filtration) need not be considered. The first filter 11A is not limited to the structure described in the first embodiment, but may use the filter described in the second to fourth embodiments.

Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited thereto.
[Sample preparation]
(Example 1, Comparative Example 1)
A filter having the shape shown in FIG. 10 was manufactured by the following method.
As a single-sided heat-sealing nonwoven fabric, "Precise α Seal (registered trademark)" manufactured by Asahi Kasei Corporation, and as a deterioration inhibitor, a mixture of potassium hydrogen tartrate and calcium oxide at a mass ratio of 1: 1 were prepared. Further, as the non-woven fabric (“Precise α seal”), one having a thickness of 0.17 mm, a basis weight of 45 g / m ² , a porosity of 52 vol%, and a pore diameter of 55 μm was used. The porosity and the pore diameter were measured with a mercury porosimeter utilizing the principle of the mercury intrusion method.

A premixed deterioration inhibitor is sprayed so as to have a basis weight of 30 g / m ² , sandwiched between heat-sealing surfaces of a nonwoven fabric (Precise α seal), and subjected to thermal fusion (thermal fusion) over the entire surface, and then cut into Φ90 mm. Thereby, Comparative Example 1 was obtained. Then, a Φ8 mm was punched out by a punch to obtain a filter 71 of Example 1 having a hole (oil passage hole 16). That is, the filter of Comparative Example 1 has a configuration of “without oil passage hole”, and the filter 71 of Example 1 has a configuration of “with oil passage hole” as shown in FIG. The basic structure of the filter 71 of the first embodiment and the filter of the first comparative example are substantially the same as those of the filter 11 of the first embodiment described above. The filter 71 of the first embodiment has only one oil passage hole 16 at the center similarly to the oil passage hole 36 of the filter 31 of the third embodiment (see FIG. 5).

(Examples 2 to 8)
By changing the hole diameter and the number of holes according to Example 1, the filters 72 to 78 of Examples 2 to 8 having different total hole areas of the oil passage holes 16 when viewed in a plan view were obtained (FIGS. 11 to 10). 17 and Table 1). That is, the filter 72 in FIG. 11 is the second embodiment, the filter 73 in FIG. 12 is the third embodiment, the filter 74 in FIG. 13 is the fourth embodiment, the filter 75 in FIG. The filter 76 of FIG. 15 is Embodiment 6, the filter 77 of FIG. 16 is Embodiment 7, and the filter 78 of FIG. 17 is Embodiment 8.

(Example 9)
In order to sufficiently obtain the effect of suppressing oxidation deterioration, two filters 75 (see FIG. 14) of Example 5 were stacked, and a PET nonwoven fabric filter similar to the filter of Comparative Example 2 was further stacked on the upper layer. By further stacking a PET non-woven fabric on the laminate in which two filters 75 are stacked, clogging due to the degraded material can be more effectively prevented.

(Comparative Example 2)
A PET nonwoven fabric filter having a thickness of 4 mm, which performs a physical function of excluding the passage of oil residue and the like, was prepared. This PET nonwoven fabric has a basis weight of 340 g / m ² .

〔Evaluation test〕
The edible oil filtration device 1 of FIG. 1 was used. A pressure gauge is installed before and after the filter 11 shown in FIG. 1, and a flow meter is installed after a second pressure gauge (a pressure gauge on the downstream side of the two pressure gauges). 8L of "Nissin Canola Oil" manufactured by Nisshin Oillio Group Co., Ltd. A filter holder with a diameter of 90 mm was installed at the position of the filter 11, and the cooking oil was constantly circulated by a pump.

・ Filterability test (pressure loss test)
The filters 71 to 78 of Examples 1 to 9 were installed in the filter holder for each example, and the pressure difference before and after passage of the edible oil was measured. As the initial filterability, the gradient of the relationship between the flow rate and the pressure difference at a temperature of 100 ° C. was used as an index (the smaller the gradient, the better the filterability). The filterability after the passage of time was determined by circulating and heating constantly at a temperature of 180 ° C. for 96 hours, and the pressure loss after the passage of 96 hours was used as an index. In all cases, the relative values are shown in Table 1 with the measurement result of Comparative Example 1 as 1.
Here, the cooking oil in the fryer 2 is heated to 100 ° C., the flow rate is changed by changing the rotation speed of the pump 3, and the pressure difference before and after the passage of the cooking oil at that time is measured using two pressure gauges. By doing so, an approximate expression was derived, the slope was calculated, and the slope was used as an index of the initial filterability. Specifically, the gradient a is obtained from an approximate straight line (y = ax) drawn on XY coordinates with the flow rate (L / min) on the X axis and the pressure difference (MPa) on the Y axis.

-Oxidation degradation suppression test (Examples 5, 9 and Comparative Examples 1-2)
Cooking oil was constantly heated and circulated at 180 ° C., and the test was continued for 96 hours. As the degree of deterioration, an acid value, which is a measurement using a potentiometric titration method, was used as an index in accordance with JIS K2501. The acid value after 96 hours was measured, and the relative values are shown in Table 1 with the result of Comparative Example 2 as 1. In Table 1, the percentage (%) described in the configuration of the hole processing is calculated by an area obtained by performing the hole processing with respect to the entire area of the filter. Then, both the entire area of the filter and the area subjected to the hole processing are ideal values.

[Results]
From the test results shown in Table 1, it is possible to obtain a filter having good filterability (initial and temporal changes) by performing hole processing as compared with Comparative Example 1. Further, in Examples 1 to 4, the filterability is improved as compared with Comparative Example 1 regardless of the hole processing area. Further, in Examples 1, 5 to 8, the filterability is improved regardless of the hole diameter. That is, it can be seen that there is no particular limitation on the area and diameter of the oil passage hole when viewed in a plan view (Examples 1 to 9 and Comparative Example 1).

Next, the effect of the deterioration inhibitor was confirmed. It can be seen that Examples 5 and 9 and Comparative Example 1 have an effect of suppressing oxidation deterioration as compared with a filter containing no oxidation deterioration inhibitor (Comparative Example 2). From the above results, by providing the holes, the filterability of the filter was improved, and a filter having an effect of suppressing oxidation deterioration was obtained. That is, a filter capable of preventing the stored deterioration inhibitor from flowing out to the outside, having good oil filterability, and suppressing oxidative deterioration of the edible oil was obtained.
In addition, comparing the filter 75 of Example 5 with the filter of Example 9, it was also found that the filter of Example 9 had better filterability after 96 hours and reduced oxidation deterioration. That is, by increasing the amount of the oxidative deterioration inhibitor, the effect of suppressing oxidative deterioration is more obtained, and the filtration property is improved over a long period of time by laminating the PET nonwoven fabric.

Note that the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved. For example, the shape and number of the oil passage holes can be variously changed, and the number of filters to be used and how to combine a plurality of filters can be variously changed depending on the application.
Further, the present invention is not limited to a filter that suppresses the deterioration of edible oil, and can be applied to a filter that suppresses the deterioration of other oils.

11, 21, 31, 41, 51 Filter 11A First filter 12 Deterioration inhibitor 13, 33 Sheet 14, 44 Filter body 15, 45 Closing part 16, 26, 36, 46 Oil passage hole 45a Closing edge 45b Bag 61 Second filter

Claims (7)

A deterioration suppressor that suppresses oil deterioration, and a filter body including a pair of sheets sandwiching the deterioration suppressor,
A filter, wherein the filter main body is provided with a closing portion for confining the deterioration inhibitor and an oil passage hole for allowing oil to pass therethrough.   The filter according to claim 1, wherein a size of the oil passage hole is larger than a size of a pore of the filter body.   The filter according to claim 2, wherein the filter main body is formed of a papermaking sheet, and the size of the oil passage hole is larger than the size of the pores of the papermaking sheet.   The filter according to claim 2, wherein the filter main body is formed of a nonwoven fabric sheet, and the size of the oil passage hole is larger than the size of the pores of the nonwoven fabric sheet.   The filter according to claim 1, wherein a size of the oil passage hole is larger than a particle diameter of the deterioration inhibitor.   The closing portion has a closing edge that closes the periphery of the deterioration suppressing agent, and a bag portion that is surrounded by the closing edge and stores the deterioration suppressing agent, and the oil passage hole is provided in the closing edge. The filter according to claim 1, wherein the filter is formed.   The filter according to any one of claims 1 to 6, wherein a second filter for physical filtration is superimposed on at least one of the pair of sheets of the filter body.

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