JPH09220415A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently filter, deodorize and decolor a soiled edible oil. SOLUTION: Sheet like filter elements 3 containing 20-80wt.% cellulose fiber, 20-80wt.% activated clay, 0-4wt.% binder and 0-40wt.% activated carbon and having 20-150g/m<2> coating weight and ruggedness on the surface are laminated to have 0.20-0.40g/cm<3> apparent density and are cut evenly to form a smooth surface in the edge part of the laminated filter elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter, and more particularly to a filter suitable for reclaiming dirty edible oil when used.

[0002]

2. Description of the Related Art Conventionally, there is a technique for regenerating soiled edible oil by using a sheet-shaped filter made of cellulose fibers and an adsorbent such as activated clay or activated carbon.
No. 0, JP-A-57-187012, JP-A-3-776.
It is known from the publication No. 15, etc. The edible oil is deodorized and decolorized by the adsorbent, in addition to the solid content being captured by the filter.

[0003]

The known filter is apt to be clogged with the solid content remaining on the filter, and the oil filtration rate is likely to decrease. Further, since the degree of deodorization and decolorization of oil depends on the contact time with the adsorbent, it is difficult to obtain a sufficiently long contact time by only passing through one sheet-shaped filter. Although it is possible to extend the time by stacking a plurality of filters, it is difficult to say that such a filtration method is efficient because the filtration speed decreases when the filter in the uppermost layer is clogged.

[0004] Therefore, an object of the present invention is to obtain a filter which can easily prolong contact time with an adsorbent and which is less likely to be clogged.

[0005]

In order to solve the above problems, in the filter according to the present invention, 20 to 80% by weight of cellulose fibers, 20 to 80% by weight of activated clay and 0 to 4% by weight are used. And a binder of 0 to 40% by weight, and a sheet-shaped filter element having a basis weight of ^{20 to} 150 g / m ² and unevenness on the sheet surface, and an apparent density of 0.20 to 0.40 g / cm 2. It is characterized in that the edges of the filter elements that are overlapped with each other so as to be ³ and are overlapped with each other are cut and aligned to form a smooth surface.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the filter according to the present invention will be described below with reference to the accompanying drawings.

A filter 1 shown in a perspective view in FIG. 1 has a cylindrical core 2 around which a filter element (filter paper) 3 is wound.
It is a columnar body in which a cap 4 is fitted on the upper end of the winding core 2. The filter 1 has upper and lower end surfaces 6 and 7, and a peripheral surface 8, and the edges of the filter element 3 are cut and aligned so that both end surfaces 6 and 7 are smooth surfaces. On the peripheral surface 8 there is an end 9 of the filter element 3, which is optionally joined to the filter element 3 located below it. The lower end of the winding core 2 is in an open state, and the cap 4 can be fitted here as well if necessary.

FIG. 2 is a partially cutaway side view of the filter 1 housed in a container 11 for filtering used cooking oil. Filter 1 is a plastic mesh bag 1
After being put in 0, it is stored in the cylindrical filtration container 11. The container 11 includes a main body 12 and a lid 13,
During the filtration work, the main body 12 and the lid 13 are kept in a sealed state by an appropriate means (not shown). The main body 12 has an inlet 16 for cooking oil in the peripheral wall 15 and an outlet 18 in the bottom wall 17, and the bottom wall 17 has a central portion 19 and a peripheral step portion 20 higher than that. The lid 13 has a hanging portion 21 on the inner surface thereof, which can be pressed against the upper end surface 6 of the housed filter 1, whereby the lower end surface 7 of the filter 1 is brought into close contact with the step portion 20 of the container 11.

The edible oil to be filtered enters through the inlet 16 and flows in the directions indicated by arrows AF. In filter 1,
The filtered oil flows from the upper end surface 6 toward the lower end surface 7, and the filtered oil exits from the lower end surface 7 through the discharge port 18. The oil can enter the filter 1 from the peripheral surface as well, but since the filter elements 3 overlap each other in multiple layers, the amount of oil that can enter the oil is negligible as compared with the amount from the upper end surface 6.

The filter element 3 of the filter 1 thus constructed has 20 to 80% by weight of cellulose fibers, 20 to 80% by weight of activated clay, and 0 to 0% for binding these fibers and activated clay. It contains 4% by weight of a resin binder and 0-40% by weight of activated carbon which is further added as required, has a basis weight of 20-150 g / m ² , and is either creped or embossed. Has been applied. As for the crepe or embossing, the application rate is preferably 5 to 20%. When the filter element 3 is wound around the winding core 2, the apparent density of the filter elements 3 overlapping each other is 0.20 to 20.
The winding condition is adjusted so as to be 0.40 g / cm ³ . A core material such as a conventional paper tube or a plastic pipe is used for the winding core 2, and a processed product such as plastic or metal is used for the cap 4.

The mechanism by which oil is filtered by this filter 1 is
It is considered as follows. Since the filter element 3 has unevenness on the sheet surface by either crepe processing or embossing processing, a portion contacting with each other and a portion separating from each other occur between the filter elements 3 that are wound and overlap each other. At that time, when the basis weight and the apparent density of the filter element 3 are the above-mentioned conditions, the contacting portions are intermittently present, and the separating portions have an appropriate separation distance, and the upper and lower end surfaces of the filter 1 are provided. A complicatedly curved oil passage is formed between 6 and 7. FIG. 3 is a schematic view of the passage 100. The passage 100 is defined by overlapping filter elements 3A and 3B,
It has a large number of bent portions 101 and straight portions 102. When the dirty oil enters the passage 100 from the upper end surface 6 of the filter 1, the solid content 105 in the oil is captured by the upper end surface 6 of the filter 1, and the bent portion 101 and the straight portion 102 of the passage 100.
Are captured by attaching to. In the bent portion 101, the inclination of the passage 100 is gentle and the oil flow is slow, so that the trapped amount is particularly large.

The passage 100 thus bent can have a very long distance as compared with the length of the cylindrical filter 1.
Therefore, the dirty oil flowing through the passage 100 can come into contact with activated clay or activated carbon, which is an adsorbent contained in the filter element 3, for a long time, and the degree of deodorization / decolorization progresses depending on the time. It will be.

In FIG. 2, the used filter 1 is
The top 10A of the bag 10 can be grasped and easily taken out from the container 11.

FIG. 4 is a diagram showing an embodiment of the present invention. As shown in FIG.
Each has a donut shape, and a large number of the donuts are stacked to form a columnar body. The peripheral surface 30 is defined, and a duct 31 extending vertically to the center is defined. (B)
As shown in FIG. 5, the columnar body has an apparent density of 0.20 to 20 due to the top fixing plate 32, the bottom fixing plate 33, and the rod-shaped or band-shaped fixing member 34 connecting these plates 32, 33.
It is sandwiched so as to be 0.40 g / cm ³ .
As shown in (C) which is a cross-sectional view taken along the line CC of (B), a discharge port 35 having substantially the same diameter as the duct 31 is provided at the center of the bottom fixing plate 33. When this filter 1 is used by being housed in a container 11 similar to that shown in FIG. 2, oil permeates between the filter elements 3 from the edge of the filter element 3 looking into the peripheral surface 8 of the filter 1, and the same as in FIG. After being filtered by such a mechanism, it advances to the pipe line 31 and goes out of the container 11 through the discharge port 35. In this filter 1, the filter element 3
In addition to the donut shape, the shape can be an appropriate shape such as a rectangle or a square.

In the filter 1 according to the present invention, the overlapping filter elements 3 have an apparent density of 0.2.
If it is less than 0 g / cm ³ , the separation dimension between the filter elements 3 becomes too large, and expansion and contraction due to humidity change during storage of the filter 1 are likely to occur, or deformation of the filter element 3 due to oil pressure is likely to occur. Or Therefore, it becomes difficult for the filter 1 to maintain a desired shape. If the apparent density is greater than 0.40 g / cm ³ , the spacing between the filter elements 3 will be too small. As a result, in the case of the filter 1 of FIG. 1, most of the solid content in the oil is captured by the upper end surface 6 and the upper end surface 6 is blocked, and the filtration speed is likely to decrease. Further, since the oil has to flow under a high pressure, the pressure often damages the filter element 3.

The cellulose fibers used in the filter element 3 are preferably wood pulp. In order to reinforce this fiber, it is also possible to mix synthetic fibers up to 10% by weight of the filter element 3.

The amount of activated clay of the filter element 3 is 2
If it is less than 0% by weight, in order to secure a sufficient contact time between the oil and the activated clay, for example, in the case of the filter 1 of FIG. 1, its length may have to be lengthened. Thereby, the filter container 11 becomes unnecessarily large. On the other hand, if the amount of activated clay is more than 80% by weight, the strength of the filter element 3 is significantly reduced, and it becomes difficult to maintain the form of paper. The activated clay and activated carbon preferably have a particle size of 85% or more when passing through 200 mesh, which facilitates paper making of the filter element 3 and also the adsorption efficiency when compared with the amount of the adsorbent used. Becomes higher.

The basis weight of the filter element 3 is 20 g / m
^{If it is} less than ² , the filter element 3 is too thin to maintain the strength as a sheet. Also, the basis weight is 1
If it is larger than 50 g / m ² , the filter element 3 becomes too thick, and the adsorption amount on the surface portion of the sheet reaches saturation even though there is an adsorption force in the central portion of the sheet, and the filter 1 is replaced. Occasionally, it will be necessary.

The resin binder binds activated clay or activated carbon to the cellulose fibers to facilitate the papermaking of the filter element 3 containing a required amount of the adsorbent and prevent the adsorbent from falling off from the filter element 3. In order to prevent this, a cationic or anionic polymer flocculant can be used.

When the filter 1 is put into the mesh bag 10, the gripping portion 1 having a length of 20 mm or more is provided at the top of the bag 10.
With 0A, it becomes easy to put the filter 1 in and out of the container 11. Further, when a plastic net is used as the mesh material, it is possible to obtain the bag 10 which has elasticity and is easy to fit on the peripheral surface of the filter 1.

The filter 1 thus constructed can be used for filtering industrial oil and other liquids in addition to edible oil.

A specific example for manufacturing the filter element 3 and the filter 1 is as follows. A mixture of 100 parts by weight of pulp and 200 parts by weight of powdered activated clay (activated clay SA-35 manufactured by Japan Activated Soil Co., Ltd.),
After dispersing in water to a concentration of about 2% by weight, 2 parts by weight of "Pyrex RC-104 (manufactured by Meisei Chemical Industry Co., Ltd.)" as a cationic coagulant and "Pyrex as anionic coagulant" are used. 1.7 parts by weight of M (manufactured by the same company) are sequentially added and stirred. This mixed solution is diluted with a large amount of water, paper is made with a conventional paper machine and creped, and the crepe ratio is 15%, the basis weight is 50 g / m ² , and the thickness is 0.27 mm.
To obtain a filter element of. The activated clay content of this filter element measured by the ignition loss method is 63.4% by weight.
Met.

Next, the filter element is made to have a width of 160.
mm, length 56m, roll 44mm diameter paper tube with uniform force to make roll with 115mm diameter and weight 505g (including paper weight 90g), and fit a nylon resin cap on one end of the paper tube. To obtain Filter 1. This filter 1 has a length 370 made of a commercially available plastic net.
Then, the holding portion 10A having a length of about 55 mm was formed above the top of the filter 1 by placing it in the mandarin orange bag 10 mm.

[0024]

The filter according to the present invention comprises a cellulose fiber and an adsorbent, and since the filter elements having unevenness on the sheet surface due to crepe processing or embossing are superposed on each other, even if the whole is relatively small, it is large. The filtration area can be obtained. As a result, this filter does not easily become clogged, and moreover, the solid content of soiled edible oil can be effectively captured. Further, in this filter, the oil can contact the adsorbent for a long time, so that deodorization and decolorization are surely performed.

[Brief description of drawings]

FIG. 1 is a perspective view of a filter.

FIG. 2 is a partially cutaway side view of a filter housed in a container.

FIG. 3 is a schematic partially enlarged cross-sectional view of a filter.

FIG. 4 is a view showing an embodiment of a filter,
(A) is a perspective view showing a state in which filter elements are stacked,
(B) is a perspective view of the filter, (C) is a sectional view taken along the line CC of (B).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter 2 Core material (core) 3 Sheet-shaped filter element 6 Edge (upper end surface) 7 Edge (lower end surface) 30 Edge (peripheral surface)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuomi Suzuki 4-13-17 Oi, Shinagawa-ku, Tokyo Ihara High Pressure Fitting Industry Co., Ltd.

Claims (6)

[Claims] 1. Cellulose fibers of 20 to 80% by weight and 2
20 to 150 g, containing 0 to 80% by weight of activated clay, 0 to 4% by weight of binder, and 0 to 40% by weight of activated carbon
A sheet-shaped filter element having a fabric weight of / m ² and unevenness on the sheet surface has an apparent density of 0.20 to 0.40 g.
/ Cm ³ and brought manner overlaid made, and filter, characterized in that it is trimmed is the edge of overlapping the filter element to form a smooth surface. 2. The filter according to claim 1, wherein the unevenness on the sheet surface of the filter element is one of a crepe and an emboss. 3. The filter according to claim 1, wherein the filter element has a cylindrical shape in which the filter element is wound around a core material, and both ends thereof are smoothly cut and aligned. 4. The filter is a columnar body in which a large number of the filter elements are stacked between a top plate and a bottom plate which are parallel to each other, and which are pressed and held from above and below through the plates. An edge portion of the filter element forming the peripheral surface of the columnar body is smoothly cut and aligned, and any one of the filter element, the top face plate and the bottom face plate that are stacked on the center portion of the columnar body. The filter according to claim 1, wherein a pipe line is formed so as to pass through one of them. 5. The filter is contained in a liquid permeable mesh bag having a length 2 above the top of the filter.
5. A gripping part having a size of 0 mm or more is included.
The filter according to any one of the above. 6. The filter according to claim 1, wherein the crepe rate or emboss rate of the filter element is 5 to 20%.