JP2000300437A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the filter in an extract recessed part having a peculiar shape to allow it to be used for filtering, by standing a peripheral wall from the periphery of the bottom, substantially vertically standing the peripheral wall of a standing part from a shorter side of the rectangular bottom, and roundly expanding the peripheral wall upward as a whole. SOLUTION: A filter 1 has a substantially rectangular bottom 2, a peripheral wall 3 stands upward from the periphery of the bottom 2, a part 3' of a peripheral wall standing from one shorter side 4 of two shorter sides 4, 5 facing to each other of the rectangular bottom 2 stands substantially vertically, and the peripheral wall 3 has a deformed cup shape where it roundly expands upward as a whole. An angle θ relative to a horizontal surface of a peripheral wall of a filter 1 is 90 deg.<=θ<=97 deg. in the part 3' of the substantially vertically standing peripheral wall based on volume efficiency, filtering function, adequacy to an extract recessed part, and operability, and 100 deg.<=θ<=115 deg. in the peripheral wall 3 of the filter 1 which roundly expands upward as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an extractor for extracting components in an extract in a state where the extract and an extraction solvent are put in an extract recess and accumulating the extract in an extract recess having a special shape. The present invention relates to a filter installed and used for filtration.

[0002]

2. Description of the Related Art As an extractor for extracting an ingredient in an extract by putting an extract and an extraction solvent in an extraction recess, for example, there is a so-called coffee dripper which is widely used in households. The coffee dripper pours hot water from above the coffee powder in the filter paper provided in the recess of the appliance, and simultaneously drains the coffee extract from the hole below the appliance. Before use, the so-called "coffee filter", which is widely used for home use for coffee drippers, has a symmetrical shape such as an isosceles triangle cut from a fan shape with the pivot of the fan at the top. The portion where the isosceles triangle is cut off is the bottom portion of the filter. This coffee filter is made by stacking filter papers in layers, and when used, is opened from the upper part of the filter and placed in the coffee dripper recess. Therefore, the bottom of a conventional so-called coffee filter is a "linear bottom" even in the shape of the used condition.

[0003]

In a conventional so-called coffee dripper-type device, the poured liquid flows out of the bottom hole one after another without controlling the extraction time. However, the amount of hot water was not so limited even when the bottom of the concave portion of the device was elongated and narrow. Therefore, the bottom of the filter installed in the concave portion could be a "linear bottom" even in use. By the way, the extractor that extracts in a pooled state in which the extraction time in which the filter of the present invention is used can be controlled is limited in size by the size of the extraction recess, and is placed on a container that receives the extract. As it is used, when assuming an extractor to be mounted in a container of a predetermined range of sizes, the size of the container should be such that the extractor can be stably and safely mounted and operated. In relation to this, the size and diameter of the extractor, and hence the size and diameter of the extraction recess, are also limited, so there is a limit to the expansion of the volume in the recess with the bottom to which the `` linear bottom '' filter is applied, For example, if the structure of the extractor is made as shown in FIGS. 37 to 44 and the bottom is widened, the volume can be increased. This structure has an upright rod-shaped stopper 5 for opening and closing the outflow hole 56 in order to allow the solvent to be extracted for a necessary time in a state where the extraction solvent is accumulated and then to be filtered out.
7 and the outflow recess 52 into which the upright plug is inserted must be provided in a limited diameter range in contact with the extraction recess 55 communicating with the communication hole 54, and the wall of the extraction recess has a rod-like shape in which the wall of the extraction recess stands upright. Under the various restrictions on the shape of the extraction recess, such as being forced to be affected by plugs and outflow recesses, the structure of the extraction recess has been devised with the technical necessity as a structure that can make the volume of the extraction recess as large as possible. This is a unique structure in which the conical surface 61 of the trapezoid and the cylindrical surface 63 of the cylinder are connected to each other by a plane 62 that is in contact with the conical surface 61 at the generating line 64 and intersects the cylindrical surface 63 at the position of the intersection line 65. As a result of such a contrivance, a wide bottom portion 53 having a shape in which a semicircle is fitted to one side of the square of the bottom of has been achieved. It should be noted that the cylindrical surface 63 includes a cylindrical surface having a slightly smaller diameter at the bottom. On the other hand, since the filter is formed of filter paper, cloth, non-woven fabric or other filter media, the filter cannot always be formed in exactly the same shape as the extraction recess of the extractor. As filter paper is often used for an inverted conical funnel, it is not better to form it in the same shape, and from the viewpoint of the filtering function as a filter, it is good for the extraction recess of the extractor. It is necessary to devise the shape and structure of the filter itself that can be applied to the filter. Therefore, including the examples of FIGS. 37 to 44, the shape of a filter that can be favorably applied to the extraction concave portion of the extractor having such a structure and the structure of a filter suitable for forming such a shape of the filter are described. It needs to be devised.

[0004]

The filter according to the present invention has a substantially rectangular bottom, a peripheral wall rises from the periphery of the bottom, a peripheral wall of a portion rising from one short side of the rectangle is substantially upright, and the peripheral wall is This is a deformed cup-shaped filter that expands as a whole as it goes upward. Further, the filter of the present invention is formed by stacking two sheet-shaped filter media, forming a deformed inverted trapezoid in which the upper base of the inverted trapezoid having a different angle with respect to the lower base of the two legs is formed in an arc shape so as to expand upward, and from the overlapped filter media. A flat bag-like shape in which the lower base portion and the leg portion of the deformed trapezoid are closed is opened from the upper base portion, and two corner portions where the lower base and the leg intersect are formed as the lower base portion. Or, a substantially rectangular bottom is formed by folding it into a triangle along the leg part, and the peripheral wall of the part that rises from the side formed by folding the triangle with the smaller angle to the lower base of the leg into the triangle is The filter described above, which is substantially upright. In addition, the filter of the present invention,
This is a folded filter obtained by folding the peripheral wall that has been opened in a cup shape while holding the substantially rectangular bottom of the modified cup-shaped filter. Furthermore, the filter of the present invention is:
It has a bottom with a shape in which the side opposite to one short side of the rectangle is inflated outward, the peripheral wall rises from the periphery of the bottom, and the peripheral wall of the part rising from the short side of the bottom is The filter is a deformed cup-like filter that is substantially upright and has a peripheral wall that is generally rounded as it goes upward.

[0005]

Hereinafter, the present invention will be described with reference to the drawings. However, the present invention is not limited to the drawings and examples. The filter 1 according to the present invention has a substantially rectangular bottom 2 as shown in FIG. 1 in a perspective perspective view,
A peripheral wall 3 rises upward from the periphery of the bottom 2, and a part 3 ′ of the peripheral wall rising from one short side 4 of two opposed short sides 4, 5 of the rectangle of the bottom 2 is substantially upright. However, as a whole, the peripheral wall 3 has a deformed cup shape that expands round as it goes upward. In addition, the folded filter 21 according to the present invention can easily reproduce the filter 1 when opened as shown in FIGS. 19 to 27 and FIGS. Also,
Another filter 31 according to the present invention has a bottom 32 having a shape in which the side facing one short side of the rectangle is inflated outward as shown in FIG. 2 in a perspective perspective view.
The peripheral wall 33 rises from the periphery of the bottom 32,
The peripheral wall 33 ', which rises from the short side 34 facing the inflated side 35 of the bottom 32, is substantially upright, but as a whole, the peripheral wall 33 has a deformed cup shape that expands in a circular manner as it goes upward. ing. In addition, since the filter material which is flexible is easily deformed and the filter is installed and used in the extraction recess of the extractor, the filter material can be corrected into a shape as exemplified in FIGS. 1 and 2. If it is not completely formed, it is not necessarily included in the modified cup-shaped filter of the present invention.

The angle θ of the peripheral walls of the filters 1 and 31 of the present invention with respect to the horizontal plane is determined by the filtering function, the compatibility with the extraction recess, the operability, and the like in the portions 3 ′ and 33 ′ of the substantially upright peripheral wall. , Preferably 90 ° ≦ θ ≦ 97 °, more preferably 90 ° ≦ α ≦ 94 °. FIG.
12 to 12 and the examples of FIGS. 28 to 36 are 92 °.
The angle θ of the peripheral walls 3, 33, which are rounded toward the top as a whole as the filters 1, 31 of the present invention are rounded upward, is most inclined in terms of volumetric efficiency, filtration function, adaptability to the extraction recess, operability, and the like. In the portion where the angle is, preferably 100 ° ≦ θ ≦ 115 °, more preferably 101 ° ≦ θ ≦ 113 °, and particularly preferably 10 ° ≦ θ ≦ 113 °.
4 ° ≦ θ ≦ 108 °.

[0007] The outer width l2 of the bottom 2, 32 with respect to the outer diameter 11 of the filter upper edges 8, 38 of the filters 1, 31 of the present invention.
The ratio l2 / 11 of the (width of the narrow bottom) is preferably 0.22 ≦ l2 / l1 ≦ 0.78, more preferably 0.22 ≦ l2 / l1 ≦ 0.78, from the viewpoint of volumetric efficiency, filtration function, compatibility with the extraction recess, and operability. Satisfies 0.3 ≦ l2 / l1 ≦ 0.66, particularly preferably 0.34 ≦ l2 / l1 ≦ 0.38.

The bottoms 2 and 3 of the filters 1 and 31 of the present invention
The ratio h / l2 of the height h of the filter to the width l2 (width of the narrow bottom) of 2 is preferably 2 ≦ h / l2 from the viewpoint of volumetric efficiency, filtration function, compatibility with the extraction recess, operability, and the like. ≤
3.2, more preferably 2.3 ≦ h / l2 ≦ 3.
1, particularly preferably 2.5 ≦ h / l2 ≦ 3.

The bottoms 2 and 3 of the filters 1 and 31 of the present invention
The ratio l3 / l2 of the length l3 of the bottom to the width l2 (width of the narrow bottom) of 2 is preferably 1.4 ≦ l3 / l2 ≦ from the viewpoint of volumetric efficiency, filtration function, and compatibility with the extraction recess. 2, more preferably 1.5 ≦ 13/12 ≦ 1.9, particularly preferably 1.6 ≦ 13/12 ≦ 1.8.

[0010]

EXAMPLES The filter according to the present invention is as follows.
For example, a flexible filter medium to be the peripheral walls 3 and 33 is formed into a tubular shape with one opening larger than the other opening like a trumpet, and a substantially rectangular or rectangular shape having the bottoms 2 and 32 in the smaller opening. It can be formed by a method such as joining a filter medium in which the side facing one short side is expanded outward, or covering it with a flat or concave filter medium on a convex and compressing it with a concave. It can be created by the method described later.

That is, as shown in FIG. 13 to FIG. 18, for example, the filter 1 of the present invention folds a sheet-like filter medium such as filter paper, and the angles α and β of the two legs 14 and 15 with respect to the lower base 12 are different. The upper base 13 of the inverted trapezoid is formed into a deformed inverted trapezoid having an arc shape so as to expand upward, and the portion of the lower base 12 of the deformed trapezoid formed of overlapping filter media and the legs 14, 1
5. A deformed trapezoidal flat bag 11 in which the part 5 is closed
Then, the above-described shape of the filter 1 of the present invention is formed from the flat bag 11 as follows.
The flat bag 11 has joints 12 ″ and 15 ″ as one means for closing the portion of the leg 15 which is not the leg 14 already closed because of the fold and the portion of the lower base 12;
The outer end of the joint is the lower base 12 'and the leg 15', which are the ends of the filter media, and the inner end of the joint is the lower base 12 and the leg 15 '.
And the joints fold along the inner edges 12, 15 (eg, the lower base joint 12 ″ is folded forward of the drawing in FIG. 13 and the leg joint 15 ″ is folded away from the drawing). A description will be given focusing on the lower base 12 and the legs 15. That is, after the joint 12 ″ at the lower end and the joint 15 ″ at the left end of the deformed trapezoidal flat bag 11 of FIG. 13 are folded along the lower base 12 and the leg 15, the upper base 13 is rounded. Opening, the lower corner 12 of the flat bag 11 of FIG. 13 and the two corners 16 and 17 where the legs 14 and 15 intersect along the lower base 12 as shown in the bottom view of FIG. Triangle below (Δ1, Δ2)
And fold the filter medium into two long sides (6, 7) so as to form a substantially rectangular shape with the two sides (4, 5) of the two triangles facing in parallel as two short sides. Thus, a substantially rectangular bottom 2 is formed to form a deformed cup shape as shown in FIGS. A part 3 ′ of the peripheral wall rising from the side 4 formed by folding a portion of the angle α at which the leg 14 having a smaller angle with respect to the lower base 12 and the lower base 12 intersects into a triangle (Δ1) is substantially formed. You will be upright. Note that, depending on the relative size of the bottom of the extraction recess of the extractor and the bottom of the filter 1, the side 4 where a part of the peripheral wall rises substantially upright may be slightly larger than the opposite side 5. In some cases, the compatibility with the extraction recess is improved, and the bottom having such a shape is also included in the substantially rectangular bottom of the filter 1 according to the present invention. The two corners 16, 17 are connected to the legs 14, 15 as shown in FIG.
Can be folded upward in a triangle (Δ1, Δ2) to form a substantially rectangular bottom 2. As one method of closing the bottom 12 and the leg 15 of the deformed trapezoidal flat bag 11, joining portions 12 "and 15" are provided at the edges of the bottom and the leg of the overlapping trapezoidal deformed trapezoid. But
The joining can be the same as the joining with a jagged chuck in a so-called coffee filter which is widely used, or can be joined, for example, by sandwiching and pressing between metal appliances having jagged uneven teeth which mesh with each other. .

The different angles α and β of the flat bag 11 with respect to the lower base 12 of the two legs 14 and 15 of the deformed trapezoid are as follows:
The smaller angle α is preferably 91 ° ≦ α ≦ 102 °, more preferably 93 ° ≦ α ≦ 99 °. The larger angle β is preferably 113 ° ≦ β ≦ 123 °, more preferably 116 ° ≦ β ≦ 120 °.

The ratio of the small-angle legs 14 to the base 12 in a state where the joints 12 ″ and 15 ″ of the flat bag 11 are removed (folded) is preferably 1.1 ≦ the length of the small-angle legs. / Length of base ≦ 1.5, more preferably 1.2 ≦ Length of small angle / Length of base ≦
1.4. The leg 1 having a large angle with respect to the base 12 in a state where the joining edge of the flat bag 11 is removed (turned).
The ratio of 5 is preferably 1.0 ≦ Length of the large angle / Length of base ≦ 1.4, more preferably 1.2 ≦
The length of the large angle leg / the length of the base ≤ 1.3.

In order to form the circular edge 8 in a state where the arc of the arc-shaped upper base 13 is opened in the deformed cup shape as described above, for example, the height is made large and the shape is changed to the deformed cup shape. In the open state, place a disk of the desired diameter into the cup
And the line where the disk and the peripheral wall 3 touch is the upper base 1
Arc 3

As a method for closing the bottom 12 and the leg 15, the filter 1 formed from the deformed trapezoidal flat bag 11 using the joints 12 ″ and 15 ″ is used.
Is developed, as shown in FIG. 18 in a developed view, it is recognized that a fold f for forming into a deformed cup shape is indicated by a dotted line.

As described above, the deformed trapezoidal flat bag 11
Cup-shaped filter 1 of the present invention formed from
19, as shown in FIG. 19 to FIG.
While holding the substantially rectangular bottom 2 formed by folding the two corners 16 and 17 formed by the legs 14 and 15 downward along the lower base 12 into a triangle (Δ1, Δ2). ,
By forming two more triangles (Δ3, Δ4) with the short sides 4, 5 of the bottom 2 of the rectangle as one side, the hexagon 2,
By folding the peripheral wall 3 so as to form 2, the folded body filter 21 of the present invention is obtained. The folded filter 21 can very easily reproduce the shape of the deformed cup-shaped filter 1 of the present invention by opening from the upper bottom side 13. The same applies to a case where the two corners 16 and 17 are folded up in a triangle along the legs 14 and 15 to form a substantially rectangular bottom 2. Then, as described above, the portion of the base 12 and the leg 15
In such a folded body 21 of a filter formed from a deformed trapezoidal flat bag 11 in which the joints 12 ″ and 15 ″ are used as a method of closing the portion, when the filter is unfolded, as shown in FIG. In addition to the fold f for forming the deformed cup-shaped filter 1, a fold f ′ for forming the folded body 21 is recognized.

The filter 31 of the present invention is, for example, shown in FIG.
As shown in FIG. 36, a sheet-like filter medium such as filter paper, non-woven fabric, cloth, or the like, which becomes the peripheral wall 33, is formed in a tubular shape with one opening larger than the other opening like a trumpet. A joint S is provided at the edge of the opening of
A rectangle having a joining portion S 'at the edge of a filter medium having a shape in which a semicircle having the diameter of the short side is fitted to the outside of the side facing the one short side of the rectangle having a joining portion S 32 and the joining portion S 'are joined at the portion where the peripheral wall 33 overlaps, so that the side facing one short side 34 sandwiched between the two long sides 36 and 37 of the rectangle faces outward. It has a bottom 32 in the shape of an inflated side 35, from which a peripheral wall 33 rises around the bottom 32, said short side 34 of said bottom 32
The peripheral wall 33 'of the portion rising from
As a whole, a deformed cup-shaped filter 31 is obtained which expands as it goes upward as a whole. In addition, the filter material serving as the bottom 32 as described above is placed on a convex shape having a desired deformed cup shape, and is heat-pressed with one or a divided concave shape from above to form a deformed cup-shaped filter 31. You can also.

The filter according to the present invention is, for example, shown in FIG.
Opening / closing the outflow hole by manipulating the upright rod-like stopper of the extractor as shown in Fig. 7 to Fig. 44, the extraction time can be controlled. In a state where the outlet is opened with a rod stopper that stands upright, the extract is contained in the filter, the extraction solvent is poured in, the extraction is performed for a necessary time, and then the outlet is opened and the outlet is used for filtration. . It is preferable that the upper edges 8, 38 of the filters installed in the extraction recesses slightly protrude above the extraction recesses. The bottom 2 of the filter installed in the extraction recess has a gap between itself and the bottom 53 of the extraction recess as illustrated in FIG. 45 in a partial plan view, but serves as an outflow passage for the filtrate filtered by the filter 1. On the contrary, it is well suited to the extraction recess, and can be suitably applied even when no groove or ridge is provided on the inner wall of the extraction recess or when it is insufficient. Further, in FIG. 45, for the sake of clarity, two corners of the rectangle of the bottom 2 of the filter are attached to an arc-shaped bulging portion of the bottom 53 of the extraction recess, and the bottom 53 of the extraction recess is formed.
Although the bottom 2 of the filter is drawn relatively small as compared to, the filter media is often soft so that a filter with a larger bottom may actually fit into the extraction recess. As shown in FIG. 45, the bottom 32 of another filter of the present invention installed in the extraction recess has an appropriate gap because there is no corner to be inserted into the arc-shaped bulging portion of the bottom 53 of the extraction recess. To achieve this, the width relative to the length should be smaller than the width relative to the length of the bottom of the extraction recess 52.

[0019]

As described above, according to the present invention,
Opening and closing of the outlet hole by manipulating the upright rod-shaped stopper. Controlling the extraction time. Extraction in a state where the extraction solvent is collected. Also, a filter having a structure excellent in forming such a shape can be provided. In addition, it can be stored, packed, and displayed in a stack like a paper cup.
Does not take up volume. In the case of a folded body, it can be stored, packaged, and displayed more compactly, and a three-dimensional deformed cup-like shape can be easily reproduced when used.

[Brief description of the drawings]

FIG. 1 is a transparent perspective view of a modified cup-shaped filter of the present invention.

FIG. 2 is a perspective view of another modified cup-shaped filter of the present invention.

FIG. 3 is a front view of the embodiment.

FIG. 4 is a rear view of the embodiment.

FIG. 5 is a plan view of the embodiment.

FIG. 6 is a bottom view of the embodiment.

FIG. 7 is a bottom view of the embodiment.

FIG. 8 is a left side view of the embodiment.

FIG. 9 is a right side view of the embodiment.

FIG. 10 is a sectional view taken along line AA of the embodiment.

FIG. 11 is a sectional view taken along line BB of the embodiment.

FIG. 12 is a sectional view taken along the line CC of the embodiment.

FIG. 13 is a front view of a deformed inverted trapezoidal flat bag.

FIG. 14 is a plan view of a deformed inverted trapezoidal flat bag.

FIG. 15 is a bottom view of a deformed inverted trapezoidal flat bag.

FIG. 16 is a left side view of a flat bag having a modified inverted trapezoid shape.

FIG. 17 is a right side view of the modified inverted trapezoidal flat bag.

FIG. 18 is a development view of a flat bag having a deformed inverted trapezoid shape.

FIG. 19 is a front view of a folded body of the modified cup-shaped filter of the present invention.

FIG. 20 is a rear view of the folded body.

FIG. 21 is a plan view of a folded body.

FIG. 22 is a bottom view of the folded body.

FIG. 23 is a left side view of the folded body.

FIG. 24 is a right side view of the folded body.

FIG. 25 is a sectional view taken along line AA of the folded body.

FIG. 26 is a sectional view taken along line BB of the folded body.

FIG. 27 is a development view of a folded body.

FIG. 28 is a front view of another modified cup-shaped filter according to an embodiment of the present invention.

FIG. 29 is a rear view of another embodiment.

FIG. 30 is a plan view of another embodiment.

FIG. 31 is a bottom view of another embodiment.

FIG. 32 is a left side view of another embodiment.

FIG. 33 is a right side view of another embodiment.

FIG. 34 is a sectional view taken along line AA of another embodiment.

FIG. 35 is a sectional view taken along line BB of another embodiment.

FIG. 36 is a sectional view taken along line CC of another embodiment.

FIG. 37 is a front view of the extractor.

FIG. 38 is a plan view of the extractor.

FIG. 39 is a bottom view of the extractor.

FIG. 40 is a left side view of the extractor.

FIG. 41 is a right side view of the extractor.

FIG. 42 is a sectional view taken along line AA of the extractor.

FIG. 43 is a sectional view taken along the line BB of the extractor.

FIG. 44 is a sectional view taken along line CC of the extractor.

FIG. 45 is an explanatory diagram of the positional relationship of the bottom of the filter installed on the bottom of the extractor.

[Explanation of symbols]

1. Deformed cup-shaped filter 2. Bottom of filter
3: Peripheral wall of the filter 3 ': A part of the peripheral wall that stands upright
6, 7 ... long bottom side 8 ... top edge 11 ... deformed inverted trapezoidal flat bag 12 ... bottom bottom 12 "... joint
13 ... Upper base 14, 15 ... Leg 15 "... Joint 16, 17 ... Corner 21 ... Folded body filter 2
2 ... Hexagon 31 ... Other modified cup-shaped filters
32 ... Bottom 33 ... Peripheral wall 33 '... A part of the peripheral wall that stands substantially upright 34 ... Bottom short side 35 ... Bottom inflated side
36, 37 ... long side of bottom 38 ... top edge 51 ... extractor 52 ... extraction recess 53 ... bottom of extraction recess 54 ... communication hole 55 ... outflow recess 56 ... outflow hole
57: rod-shaped plug 58: flange 59: handle 61: conical surface 62: flat surface 63: cylindrical surface 64: bus bar
65 ... intersection line α, β ... angle between lower base and leg θ ...
Angle between bottom and peripheral wall Δ1, Δ2: triangle 11: diameter of upper edge l2: width of bottom 13: length of bottom S: joint of peripheral wall S ': joint of bottom

Claims (4)

[Claims] 1. A bottom having a substantially rectangular bottom, a peripheral wall rising from the periphery of the bottom, a peripheral wall of a portion rising from one short side of the rectangle of the bottom is substantially upright, and the peripheral wall is rounded upward as a whole. Spreading deformed cup-shaped filter. 2. An upper base (13) in which two sheet-like filter media are stacked and an upper base (13) of an inverted trapezoid having different angles with respect to a lower base (12) of the two legs (14, 15) so as to expand upward. ), And the lower base (12) of the deformed trapezoid and the legs (14,
15) Open the flat bag (11) closed from the upper base (13), and close the lower base (12) and the leg (1).
4, 15) are folded at the intersection of two corners (16, 17) along the lower base (12) or the legs (14, 15) into a triangle (Δ1, Δ2), and Two long sides (6, 7) are formed on the filter medium so as to form a substantially rectangular shape having two parallel short sides (4, 5) of the triangle.
A substantially rectangular bottom (2) is formed by making a fold, and a portion of the corner (16) having a smaller angle with respect to the lower base of the leg is folded into a triangle (Δ1). 2. The filter according to claim 1, wherein a peripheral wall (3 ') of a portion rising from one short side (4) of the rectangle is substantially upright. 3. An upper base (13) formed by stacking two sheet-shaped filter media and forming an inverted trapezoidal upper base having different angles with respect to the lower base (12) of the two legs (14, 15) so as to expand upward. ), And the lower base (12) of the deformed trapezoid and the legs (14,
15) Open the flat bag (11) closed from the upper base (13), and close the lower base (12) and the leg (1).
4, 15) are folded at the intersection of two corners (16, 17) along the lower base (12) or the legs (14, 15) into a triangle (Δ1, Δ2), and Two long sides (6, 7) are formed on the filter medium so as to form a substantially rectangular shape having two parallel short sides (4, 5) of the triangle.
A substantially rectangular bottom (2) is formed by making a fold, and a filter medium rises from the periphery of the bottom as a peripheral wall (3), and the angle of the corner (16) having a smaller angle with respect to the lower base of the leg is reduced. The peripheral wall (3 ') of the portion rising from a short side (4) of a substantially rectangular shape formed by folding the portion into a triangle ([Delta] 1) is substantially upright, and the peripheral wall (3) becomes rounder as it goes upward as a whole. After being formed in the shape of a deformed cup that spreads, while holding the bottom (2) of a substantially rectangular shape, two triangles (Δ) each having the short side (4, 5) of the bottom (2) of the rectangular shape as one side.
3. A folded body filter (21), wherein the peripheral wall (3) is folded so as to form a hexagon (22) by forming (4). 4. A bottom having a shape in which a side opposite to one short side of the substantially rectangular shape is inflated outward, a peripheral wall rises from a periphery of the bottom, and said short side of said bottom is formed. A deformed cup-shaped filter in which the peripheral wall of the portion that rises from the side is substantially upright, and the peripheral wall as a whole expands in a round shape as it goes upward.