JP2008178571A - Coffee filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid reduction in a hot water pouring port due to a center folding line in raising the right and left support leg pieces and supporting the same on a coffee cup in use in a coffee filter in which a support plate integrally having right and left support leg pieces on both sides of the hot water pouring port is folded in two at the center folding line to be put in the storing state. <P>SOLUTION: In the support plate 2 including an inner clamping piece 9 and an outer clamping piece 10 on leg ends 7 of the right and left support leg pieces 6, 6, a folding guide line 15 V-shaped toward the leg ends 7 of the support leg pieces is formed taking the point of intersection of the folding line and the edge 5a of the hot water pouring port 5 on both sides of the center folding line 13 as a base point 16, when the inner and outer clamping pieces 9, 10 are laid along the edge of the cup to clamp the cup from inside and outside, a part 6a of the support leg part is recessed inward in the boundary of the folding guide line 15 according to the inward sagging of the inner clamping pieces to raise the base point 16, thereby drawing the hot water pouring port 5 outward to avoid reduction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coffee filter, and more particularly to a disposable coffee filter that is discarded after a single use.

  There have already been many proposals for disposable coffee filters, many of which are commercially available and are in practical use. There are various types of disposable coffee filters. As a representative of these, the coffee liquid is extracted by placing it on a coffee cup, pouring hot water into the coffee powder accommodated in the filter while supporting the filter (filter paper bag) suspended in the air, and directly into the coffee cup. A filter containing dripping or coffee powder was placed in a coffee cup, hung on the edge of the cup, and hot water was poured into the filter in this state to extract the coffee liquid, and the coffee liquid was stored in the cup. There is a type that pulls up the rear filter.

The former is a so-called dripper-type filter, and the latter is a soak-type or soak-type filter.
The above dripper type filter has a structure in which hot water is poured into the coffee powder accommodated in the bag-shaped filter and the coffee component is extracted while the hot water passes through the filter, so that the coffee powder and hot water contact more than necessary. Therefore, the immersion type filter, which can suppress the extraction of unnecessary bitter components, has an unexpected effect and is a good filter.
For example, Patent Documents 1 and 2 disclose such a dripper type filter.
Japanese Examined Patent Publication No. 59-30411. Japanese Utility Model Publication No. 60-7622.

Now, the coffee filter 2 described in Patent Document 1 is folded in order to prevent the coffee powder 3 contained in the filter paper bag 5 attached integrally to the support plate 4 from being oxidized and deteriorated. It is stored in the packaging bag 1 in a state and sealed.
It is easy to fold the filter 2 when storing in this packaging bag when the packaging bag itself is miniaturized and handled as a product, and the support plate 4 is folded and coffee powder is enclosed between them. Although the filter paper bag 5 is sandwiched to prepare for impact from the outside, it is particularly important to downsize the packaging form in order to commercialize the product. It is an indispensable condition.

When this folding sag is seen with respect to the above-mentioned Patent Document 1, the support plate 4 is provided with an opening 7 at the center and a pair of support leg pieces 10 and 10 provided symmetrically on the left and right thereof. A center line 11 (bending line) serving as a base line that is folded in half is arranged at the center of 4, folded into two with the center line 11, and filled with coffee powder 3 to be bonded and assembled to the back surface of the support plate 4. The filter paper bag 5 is sandwiched.
When the filter 2 is used, it is pulled out from the packaging bag 1 to be sealed, opened and folded, and flattened, and then the left and right support leg pieces 10, 10 of the support plate 4 are raised in a gate shape. The inner and outer pieces 18 and 19 formed on these edges (leg end parts) are latched so as to be sandwiched by the edges of the coffee cup 17 from the inside and outside, thereby opening the opening 7 in an upward state. It is set and prepared for hot water injection.

  The drip type filter that is set on the cup in this portal state and extracts the coffee liquid has a very simple structure, yet has the characteristics of the most drip type filter. However, one problem with this filter is that the sheet-like cardboard material is used as the support plate 4 and the opening 7 opened at the center of the support plate must be used as a pouring port when pouring into the filter paper bag. In other words, since the opening 7 is opened in the limited range of the support plate 4, the size of the opening 7 is limited to the size of the opening 7 even if the size of the opening made of filter paper is increased by design. The expansion is difficult.

This problem is caused by the fact that the filter hits the folded fold and is folded in half with respect to the center line 11 and, in use, the inner leg provided on each of the supporting leg pieces 10 and 10 when set on the coffee cup. Since the piece 18 (tongue-shaped engaging piece 22) is pushed inward and inserted into the inside of the cup, the center portions of the left and right support leg pieces 10 and 10 are accordingly recessed inwardly, and are drawn into this recess. Therefore, the edge of the opening 7 is pushed inward to reduce the opening width.
The reduction of the opening width is because the portion where the center line 11 is provided is weakened by bending and loses repulsive force, and at the same time it is easy to bend in the opposite direction. This is because the portion where the edges cross each other is the center, and the opening width is narrowed.

  Therefore, the present invention has been developed in view of the above circumstances, and has been developed to improve this. In particular, the center of the support plate for folding the filter in half, more specifically, the centers of the left and right support leg pieces. This eliminates the inward bending of the center part of the supporting leg piece that proceeds from the intersection of the center line formed through the part and the edge of the opening serving as the pouring spout established in the center part of the support plate. Improving the shrinkage of the pouring spout due to the bending, and further pushing outward the portion of the support leg piece that contacts the intersection of the center line as the base point and the edge of the opening, thereby opening the opening An object of the present invention is to provide a disposable coffee filter that is substantially expanded to facilitate the pouring of hot water.

  In order to achieve the above-mentioned object, the present invention has an opening that serves as a pouring port in the center, and the support plate that is provided with support leg pieces symmetrically on both sides of the opening. A V-shaped bending guide line is formed so as to sandwich a center line formed for folding, that is, a center fold line, and the leg end portion of the support leg piece using this guide line When the inner holding piece formed on the inside is pushed inward to lock the inside of the edge of the coffee cup, the opening, that is, the edge of the pouring spout is pulled out to expand the opening width, and the coffee An object of the present invention is to provide a coffee filter in which hot water can be easily poured into a filter containing powder.

  Further, the present invention will be described in detail. In the present invention, a pouring opening is provided at the center of a horizontally long rectangular support plate, and left and right plate portions sandwiching the pouring port are used as left and right support leg pieces, and the respective support is provided. Cutouts are formed near the leg ends of the leg pieces to form tongue-like inner and outer gripping pieces, while the note is attached to the back surface of the support plate including the left and right support leg pieces. It is formed by sticking a filter paper bag enclosing a gate and enclosing a required amount of coffee powder, and when not in use, a straight line extending between the leg ends through the center of the left and right support leg pieces The filter paper bag is sandwiched in two along the central folding line, and when used, the support plate is flattened and the left and right support leg pieces are further folded into a gate shape starting from each base end. The cup is held in a standing position and the edge of the cup is held by the inner and outer holding pieces formed at the end of each leg. In the coffee filter configured to be able to be set up in a standing manner, the left and right support leg pieces are V-shaped toward the leg end parts from the one end part facing the pouring gate of the central fold line, respectively. A bending guide line is formed, and the base pin is inflated outwardly with the bending guide line as a boundary as the inner holding piece is bent inward and recessed during use. An object of the present invention is to provide a coffee filter characterized in that an edge of the pouring gate is extended outward.

  It is another object of the present invention to provide a coffee filter, wherein the V-shaped bending guide line formed on each of the supporting leg pieces is linear from the base point toward the leg end.

  It is another object of the present invention to provide a coffee filter characterized in that the V-shaped bending guide line formed on each of the support leg pieces is a loosely arcuate curve.

  Further, the present invention is characterized in that the V-shaped bending guide line formed on each of the support leg pieces is formed by extending from a base point and end portions on the leg end side toward both ends of the cutout portion. It is to provide a coffee filter.

  It is another object of the present invention to provide a coffee filter characterized in that the V-shaped bending guide wire formed on each of the supporting leg pieces is formed by embossing.

  Still another object of the present invention is to provide a coffee filter characterized in that the V-shaped bending guide wire formed on each of the supporting leg pieces has a notch in a part of the wire.

  In the present invention, when the filter is set on the coffee cup, the bending guide wire is inserted into the inside of the cup with the inner holding piece provided on the supporting leg piece, that is, the back side of the supporting leg piece, that is, the inner direction. When this happens, the part of the supporting leg that hits the upper side of the inner holding piece with the bending guide line as a boundary is recessed on the back side, and the outside of the guide line against the recess. The part of the supporting leg that hits (side), that is, the part that is connected to the outer holding piece is inflated to the surface side.

  In other words, when the tongue-shaped inner holding piece is raised toward the inner side (rear side), the bending guide line is bent so that the flat plate-shaped support leg piece is based on the guide line. The inner holding piece and the upper part following the holding piece on the inner side (rear side), and the outer holding piece drawn out to the outside, and the front and back sides of the guide line following the holding piece, that is, The support leg piece in a flat state is formed into a three-dimensional shape by making it uneven on the inside and outside so that the side portion bulges outward (surface side). In the present invention, by using this three-dimensionalization, the edge of the pouring gate that becomes the V-shaped base point of the bending guide line along with the outward swelling of the portion of the supporting leg piece following the outer holding piece The portion is urged so as to be pulled out, thereby substantially expanding the pouring spout.

  In the case of the conventional filter (Patent Document 1), when the tongue-shaped engaging piece (inner holding piece) is pushed inward to cut it up, the entire support leg piece is bent inward accordingly. The edge of the opening (pouring port) located at the upper part of the support leg piece due to the bending is also pushed inward, and the opening is substantially reduced. When the tongue-shaped inner holding piece is cut and raised, only the part surrounded by the bending guide line formed in the V shape, that is, the part that hits the upper part of the inner holding piece is pushed in, and the other parts are pushed in. At the same time, by utilizing the distortion of the indentation, the other portion is bulged outwardly, thereby pulling out the edge of the opening serving as the pouring spout.

As described above, the bending guide line is formed at the leg end of each supporting leg piece based on the point where the central folding line that folds each supporting leg piece in half and the edge of the opening serving as the pouring gate intersect. It is formed by two guide wires arranged so as to form a V shape toward the part.
And as above-mentioned, this bending induction | guidance | derivation line | wire may have a case where it is linear, and a case where it forms with a loose curve.
In addition, since the bending guide line is arranged to push and bend the tongue-shaped inner holding piece inward as described above, the range in which the bending induction line can be enclosed Will be formed.
This will be described in more detail. A cut-out portion where the end on the leg end side cuts out a tongue-shaped inner holding piece from the intersection with the center fold line placed at the opening edge of the pouring spout. It is good that it reaches the end. Furthermore, there may be an end portion of the bending guide line at a position midway from the base point to the end portion of the cutout portion.

  The filter of the present invention according to the above configuration is enclosed and stored in a packaging bag after storage. And when it is not in use, the left and right support leg pieces are folded in two around the center fold line, and a filter paper bag enclosing coffee powder integrally provided on the back side is sandwiched therebetween. In use, the left and right support leg pieces folded out in two are opened flatly, and then the left and right support leg pieces are gate-shaped with the upper end facing the pouring spout as a base point. The inner holding pieces provided on these supporting leg pieces are pushed in from the outside (front side) of the supporting leg pieces and raised to the back side, while maintaining this state. The holding piece is brought inside the edge of the coffee cup, and the outside holding piece is attached to the outside of the edge of the cup. Mounting, that is, setting work is completed.

In this setting operation, the bending guide wire is used as a boundary by pushing toward the inside of the tongue-shaped inner holding piece, and the inner holding piece and the supporting leg piece portion above it are located on the inner side (rear side). In accordance with this, other parts bulge outward, and along with this, the edge of the pouring spout expands outward and opens the mouth widely.
The expanded state of the pouring spout is maintained by the inner holding piece being locked inside the edge of the cup, and the expanded state is maintained while pouring hot water.

  Therefore, as is clear from the above, according to the present invention, in the setting operation upon use, the edge of the pouring spout can be pushed out and expanded as the inner holding piece is pushed inwardly. As a result, pouring of hot water is facilitated, and it is possible to eliminate the danger of overflowing hot water around the coffee cup.

Next, the coffee filter according to the present invention will be described based on the illustrated embodiment.
1 to 9 of the drawings are a first embodiment showing one embodiment of a coffee filter according to the present invention, and FIGS. 10 and 11 are second and third embodiments. Hereinafter, the present invention will be described in detail based on these examples, and the features thereof will be clarified.

  In the drawings, 1 is a filter, 2 is a support plate that is the main body of the filter, and 3 is a filter paper bag that encloses coffee powder 4 assembled integrally with the support plate 2.

As shown in the figure, the support plate 2 is formed of a horizontally long cardboard as a raw material, and is provided with an opening portion serving as a pouring port 5 at the center, and supports left and right portions sandwiching the pouring port 5. Leg pieces 6 and 6 are used. That is, the said support plate 2 here is equipped with the pouring spout 5 and the left and right support leg pieces 6 and 6 integrally.
Each of the support leg pieces 6 and 6 has a width direction (vertical direction in FIG. 1) near the leg end portions 7 and 7. In the description, “up” is the rear side of the support plate 2. “Lower” is the front. Therefore, the front and rear of the support plate 2 are the lower and the upper in FIG. 1), and the cutout portions 8 and 8 are provided along the support leg pieces 6 and 6. The holding pieces 9 and 9 are formed, and at the same time, the leg end portions 7 and 7 are used as outer holding pieces 10 and 10.

  The horizontally long support plate 2 is formed with a pouring port 5 and left and right support leg pieces 6 and 6 sandwiching the pouring port 5, so that the width is sufficient to form these in the lateral length direction. When the support leg pieces 6 and 6 are set on the edge portion 11a of the coffee cup 11 as will be described later, the width does not fall down in the front-rear direction. Thus, the width in the left and right and front and rear directions is determined.

  By the way, the cutout portions 8 and 8 forming the tongue-shaped inner sandwiching pieces 9 and 9 in the drawing are connected to the outer sandwiching pieces 10 and 10 at the distal ends of the inner sandwiching pieces 9 and 9. Is cut and separated, and the inner holding piece 9 can be moved alone. The straight edges 12 and 12 of the hole-shaped part divided by the inner sandwiching piece 9 receive the edge 11a of the cup when placed on the coffee cup 11 as will be described later. It becomes a contact part and supports the filter 1 vertically on the cup.

  In the figure, reference numeral 13 denotes a central fold line serving as a reference for folding the support plate 2 in two, and reference numeral 14 denotes a reference for folding the left and right support leg pieces 6 and 6 into a gate shape. Is a fold line. Reference numeral 15 denotes a bending guide wire used when the inner sandwiching pieces 9 and 9 are pushed inward, that is, toward the back side with respect to the support leg pieces 6 and 6 and are raised.

  The center folding line 13 is formed along a straight line extending through the leg end portions 7 and 7 of the left and right support leg pieces 6 and 6 at the center portion in the front-rear direction of the support plate 2. 6 and 6 are divided by the fold line 13 back and forth, and the back surfaces of the bisected portion around the fold line 13 face each other and can be folded in two.

  Further, the folding line 14 crosses from the corner of the pouring port 5 toward the front and rear edges 2a, 2a of the support plate 2 so as to extend along the extension line of the facing edges 5a, 5a of the pouring port 5. When the left and right support leg pieces 6 and 6 are assembled in a gate shape when the filter 1 is used, the base point of this bending is formed.

  On the other hand, the bending guide wire 15 is a part of the support leg pieces 6 and 6 that are in a flat state when the inner holding piece 9 cut out of the support leg pieces 6 and 6 is pushed inward. 6a and 6a are guided to be depressed toward the back side in accordance with the pressing, and the entire supporting leg piece is pushed in the pushing direction, that is, the back side by the pushing, and is located above the supporting leg piece. It acts to avoid the edge portion 5a of the pouring gate 5 moving inward and reducing the opening area of the pouring gate 5.

  The bending guide line 15 will be described in more detail. In each of the support leg pieces 6 and 6, the center folding line 13 that cuts in the longitudinal direction along the center portion of the support plate 2 and the edge of the pouring gate 5. It is formed by placing base points 16 and 16 at a portion where the portion 5a intersects and arranging two folding lines in a V shape toward the leg end portions 7 and 7 of the supporting leg pieces. .

  In this embodiment, the two folding lines that can be divided into V-shapes have their respective ends reaching the front and rear ends of the cut-out portions 8 and 8, and the bending guide wire 15 is formed by this cut-out line. An isosceles triangle is formed in each of the support leg pieces 6 and 6 in combination with the portion 8. In other words, here, the inner holding piece 9 is divided by separating the portion 6a of the supporting leg piece 6 that hits the upper portion of the holding piece 9 from the inner holding piece 9 formed in a tongue shape and the other parts. When 9 is pushed in the back direction, the portion 6a surrounded by the bending guide wire 15 is recessed with the guide wire 15 as a boundary.

Next, with respect to the filter paper bag 3, a bag portion is formed by the front and rear bag pieces 3a, 3a, and the coffee powder 4 is accommodated therein. And the upper edge part of each bag piece 3a, 3a is made into an opening part, and this upper edge part is always joined so that peeling is possible (it is explaining with a slight space | interval in drawing), The said coffee powder 4 is held in an encapsulated state.
The filter paper bag 3 is assembled by attaching the peripheral portions 17a, 17a of the attachment pieces 17, 17 extending from the upper edge portions of the bag pieces 3a, 3a to the back surface portion of the support plate 2, and assembling them integrally. Is configured.

  When the filter 1 configured as described above is not in use, the left and right support leg pieces 6 and 6 are folded in two around the center fold line 13 as shown in FIGS. In the meantime, the filter paper bag 3 fixed on the back surface of the support plate 2 is sandwiched and placed in a folded and folded state. In this state, it is stored and stored in an airtight packaging bag (not shown), and is handled as being displayed as a product.

  On the other hand, in use, after taking out from the packaging bag, the folded state is opened flat, then the mouth of the closed filter paper bag 3 is opened, and then the left and right support leg pieces 6, 6 are folded. Bending lines 14 and 14 are bent at the base point to form a gate shape. Then, the inner sandwiching piece 9 provided in these supporting leg pieces 6 and 6 is pushed in the back direction, that is, inward, raised inside the supporting leg piece, and an interval is formed between the outer sandwiching piece 10 By the way, it faces the edge portion 11 a of the coffee cup 11, and this inner holding piece 9 enters the inside of the cup 11.

  When the inner sandwiching piece 9 enters the inside of the coffee cup 11, this inner surface is pressed by the restoring force of the cardboard, and is held in cooperation with the outer sandwiching piece 10. At the same time, the edge 12 of the cutout 8 abuts the edge 11 a of the cup 11, so that the left and right support leg pieces 6 and 6 are placed on the coffee cup 11 in a stable manner.

5 to 9 show the filter 1 placed on the coffee cup 11 and set. 5 is a front view, FIG. 6 is a right side view, FIG. 7 is a plan view, FIG. 8 is a BB sectional view of FIG. 5, and FIG. 9 is a CC sectional view of FIG. .
When the inner holding piece 9 is pushed in as described above when the filter 1 is placed on the coffee cup 11, the flat support leg piece 6 is pushed in as a whole. In the filter of the present invention, the portion surrounded by the bending guide wire 15, that is, the portion 6 a hitting the base end of the inner holding piece 9 is pushed in with the bending guide wire 15 as a boundary. The inner holding piece 9 is raised on the back side while forming a recess in the bottom.

At this time, the isosceles triangular portion 6a surrounded by the bending guide line 15 in forming the dent is in a direction opposite to the direction in which the central folding line 13 passing through the center is folded in half. It is pushed in as if it is bent to form a recess.
FIGS. 7 and 8 show the state of this depression. By forming such a depression in the portion 6a, the entire supporting leg piece 6 can be prevented from being pushed to the back side, and at the same time, bending can be induced. When a portion located outside the line 15 folds the support leg 6 with the fold line 14 as a boundary, a force to spread outside acts due to the repulsion of the cardboard material, so that it bulges outward. become.
This bulge extends to the base point 16 provided at the edge 5a of the pouring spout 5, and as a result, the central portion of the edge 5a is expanded outward, and the opening of the pouring spout 5 is expanded and expanded.

  As described above, when the filter of the present invention is set on the coffee cup, the inner holding piece 9 is raised, and when this is pushed toward the back side of the support leg piece 6, the pouring inlet 5 In this state, since the inner holding piece 9 is held while it is inside the cup edge 11a, pouring of hot water becomes easy.

  Of course, the opening area of the pouring spout 5 can theoretically be designed freely, but the filter is designed for the size of a coffee cup that is usually used. The size cannot be determined. Therefore, in the filter designed in the allowable size range, it is possible to avoid the reduction change at the time of use of the pouring gate 5 established in the filter, and to change it in the expansion direction on the contrary, it is safe use. This is extremely advantageous for realization.

FIG. 10 is a plan view of a developed state of a support plate showing a second embodiment of the coffee filter according to the present invention. In the drawings, the same portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The same applies to examples described later.
In this embodiment, the two bending lines of the V-shaped bending guide lines 20, 20 formed on the support leg pieces 6, 6 are loosely directed from the base point 16 toward the end of the cut-out part 8, This is an example.

The bending guide line 20 has two lines that are curved, but as a whole, is along a V shape, and forms a substantially isosceles triangular portion 6a on the support leg piece 6. .
Although the reason for the effect produced by making the guide wire 20 loosely curved in a S-shape cannot be specifically described, it is compared with the case of the straight line in the first embodiment. As a result of the experiment, it was confirmed that the expansion of the pouring spout 5 around the base point 16 toward the outside of the edge portion 5a was large, and the expansion of the pouring spout 5 became clearer.

Next, instead of the bending guide line 20 in the second embodiment, FIG. 11 shows the two bending lines of the bending guide lines 21 and 21 arranged in a V shape on the outside (center folding line). This is a case where an arcuate curve that swells loosely in a direction away from the center 13 is obtained.
The folding guide line 21 relating to the arc-shaped curve formed here is provided with the inner holding piece 9 on the inner side as compared with the linear bending guide line 15 in the same manner as the folding guide line 20 of the second embodiment. When it is pushed in, the base point 16 is pulled out and the opening of the pouring spout 5 is greatly opened.

Although the present invention has been described in detail based on the respective embodiments, the filter according to the present invention provides the bending guide lines 15, 20, and 21 serving as the reference for bending with respect to the left and right support leg pieces 6, 6. By forming at the position, there is an advantage that the problem of narrowing the opening width by pushing the edge portion 5a of the pouring port 5 inward when the inner holding piece 9 is pushed up can be easily solved.
In addition, the bending guide line can be easily formed by pressing the cardboard of the material along the line when the support plate 2 is cut out. Of course, the bending guide line may be formed by pressing in addition to the perforation.

The top view of the state which expand | deployed the support plate. The front view of the state which folded the support plate in half. The perspective view of the state which folded the support plate in half. AA sectional drawing of FIG. The front view of the use condition set to the coffee cup. The right view of the use condition set to the coffee cup. The top view of the use condition set to the coffee cup. BB sectional drawing of FIG. CC sectional drawing of FIG. The top view of the state which the support plate in another Example developed. It is a top view of the state where the support plate in other examples developed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter 2 Support plate 3 Filter paper bag 4 Coffee powder 5 Pouring port 5a Pouring edge 6 Supporting leg piece 6a Part of supporting leg piece surrounded by bending guide line 7 Leg end part of supporting leg piece 8 Cutout part 9 Inner holding piece
10 Outside holding piece
DESCRIPTION OF SYMBOLS 11 Coffee cup 11a Edge of coffee cup 12 Edge of cut-out part 13 Center folding line 14 Bending line 15, 20, 21 Folding induction line 16 Base point 17 Filter paper bag attachment piece

Claims (6)

A pouring port is opened at the center of the horizontally long rectangular support plate, and the left and right plate parts sandwiching the pouring port are made into left and right support leg pieces, and cutouts are provided near the end portions of the respective support leg pieces. Forming a tongue-shaped inner sandwiching piece and an outer sandwiching piece, and encircling the pouring port on the back surface of the support plate including the left and right support leg pieces to provide a required amount of coffee powder. A filter paper bag to be sealed is attached, and when not in use, the bag is folded in two along a straight central folding line extending between the leg ends through the center of the left and right support leg pieces. While the filter paper bag is sandwiched, the support plate is unfolded flat when in use, and the left and right support leg pieces are folded in a gate shape with the base ends as base points and formed at the end of each leg. Nipping the edge of the cup with the inner and outer holding pieces, so that it can be set up standing That in the coffee filter,
The left and right support leg pieces are formed with bending guide lines that are V-shaped from the one end of the central fold line facing the pouring spout to the leg ends, respectively. As the holding piece is bent inwardly, the base point is expanded outwardly with the bending guide line as a boundary, and thereby the edge of the pouring gate is expanded outward. A coffee filter characterized by   2. The coffee filter according to claim 1, wherein the V-shaped bending guide line formed on each support leg piece is linear from the base point toward the leg end.   2. The coffee filter according to claim 1, wherein the V-shaped bending guide line formed on each support leg piece is a loosely arcuate curve.   4. The coffee filter according to claim 1, wherein the V-shaped bending guide line formed on each supporting leg piece extends from a base point and ends on the leg end side toward both ends of the cutout portion. A coffee filter characterized by being made.   5. The coffee filter according to claim 1, wherein the V-shaped bending guide line formed on each support leg piece is formed by embossing.   5. The coffee filter according to claim 1, wherein the V-shaped bending guide wire formed on each support leg has a notch in a part of the line.