Drip bags

Abstract

A drip bag comprising a bag body made of a water-permeable filterable sheet, fastening members provided on the front and back of the bag body, and extraction material filled in the bag body, wherein the bag body has perforations, the perforations can be easily opened and a large opening shape can be obtained. [Solution] The drip bag 1A comprises a bag body 11 made of a water-permeable filterable sheet, a fastening member 20 made of a thin plate-like material provided on the outer surfaces of two opposing sides of the bag body 11, and an extraction material filled in the bag body 11. An opening perforation 30 of the drip bag 1A is formed along the upper edge 2 of the drip bag, from one of the pair of opposing side edges 3a and 3b of the drip bag A to the other. The opening perforation 30 has an overlapping area with the perforation 31 of the bag body 11 and the perforation 32 of the fastening member, and has a convex shape S1 that is convex on the upper side or convex on the lower side of the drip bag 1A, and the convex shape S1 coincides with the center line Lc of the width of the drip bag.

Description

Technical Field

[0001] The present invention relates to a drip bag that can be easily hung on a container such as a cup to obtain an extract of coffee, black tea, green tea, Chinese herbal medicine, etc. in a drip manner.

[0002] For the purpose of easily extracting a single serving of coffee, a disposable drip bag is provided, which includes a bag body formed of a water-permeable and filterable sheet, and a hanging member formed of a thin plate material for hanging the bag body on a cup. The drip bag filled with coffee powder in the bag body is available in various product forms on the market.

[0003] For example, there is a drip bag provided with a hanging member having a hanging portion that can be caused to form on the outer surfaces of two opposing sides of the bag body (hereinafter also referred to as the front and back of the bag body). In the bag body, there is one provided with a perforation for opening along the upper side of the bag body (Patent Document 1), or one provided with a perforation for opening in the overlapping area between the bag body and the hanging member (Patent Document 2).

[0004] However, the perforation for opening these drip bags is opened from the end of the perforation on one of the opposing side edges of the drip bag as the opening start end toward the other side edge. There is a risk that the contents will scatter when the end of the opening direction of the perforation is broken. Therefore, in order not to cause the scattering of the contents, it is necessary to open the perforation for opening carefully without tearing it all at once.

[0005] Also, there is a proposed drip bag in which the upper side of the drip bag is formed by the fold of the overlapping area between the water-permeable and filterable sheet and the hanging member, and the perforation for opening is formed in a rounded-corner shape surrounding the central portion of the upper side in a state where the fold is expanded. When opening the drip bag, the upper side is pinched off (Patent Document 3). However, in this drip bag, since the rounded-corner shape directly becomes the opening shape of the bag body, there is a problem that the opening area is small.

Prior Art Documents

[0006] [Patent Document 1] International Publication No. 2014 / 092122 [Patent Document 2] Japanese Patent Publication No. 2019-48169 [Patent Document 3] International Publication No. 2001 / 56439 [Overview of the project] [Problems that the invention aims to solve]

[0007] In contrast to the prior art described above, the present invention aims to provide a drip bag in which an extraction material is filled, with a bag body made of a water-permeable filterable sheet and fastening members made of a thin plate-like material on the outer surfaces of two opposing sides of the bag body, and to eliminate the risk of contents scattering when the perforations are opened, and to obtain a wide opening area. [Means for solving the problem]

[0008] The inventors have discovered that by forming an opening perforation from one side to the other of a pair of sides of a drip bag, and by forming the perforation in a convex shape in the center of the width of the drip bag, including the overlapping area of ​​the water-permeable filter sheet forming the bag body and the fastening member forming the fastening part in the area where the perforation is formed, the perforation in the center of the width of the drip bag can be easily broken by folding the drip bag along the perforation in the center of the width of the drip bag, and the break progresses to both ends of the perforation, allowing the bag body to be opened smoothly. As a result, there is no risk of the contents scattering when opened, and a wide opening area can be secured as the entire width of the drip bag is broken from one end to the other, thus completing the present invention.

[0009] In other words, the present invention is a drip bag comprising a bag body formed of a water-permeable filterable sheet, fastening members formed of a thin plate-like material provided on the outer surfaces of two opposing sides of the bag body, and an extraction material filled in the bag body, The perforations for opening the drip bag are formed along the top edge of the drip bag, from one of the pair of opposing sides of the drip bag to the other. The perforations for opening the bag have an overlapping area between the perforations of the bag body and the perforations of the fastening member. The perforations for opening the drip bag have a convex shape, either on the upper side or the lower side. The convex shape provides a drip bag that coincides with the center line of the width of the drip bag. [Effects of the Invention]

[0010] According to the present invention, by pinching the top and bottom edges of the drip bag with the opening perforation in the center of the drip bag's width and folding the drip bag along the opening perforation, the opening perforation in the center of the drip bag's width breaks, and the break extends toward both ends of the perforation, resulting in a smooth break along the entire width of the drip bag.

[0011] Generally, in drip bags where an opening perforation is formed on one of a pair of sides, if the bag is opened quickly from one end of the perforation to the other, the contents are likely to scatter when the other end of the perforation breaks. Therefore, caution is required when opening the bag, such as slowing down the breaking speed of the perforation near the other end. However, with the drip bag of the present invention, the opening operation can be performed without worrying about the contents scattering.

[0012] Furthermore, the perforations for opening allow the entire width of the bag to be opened, ensuring a wide opening area. Therefore, pouring hot water into the opened drip bag becomes easier. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a plan view of the drip bag 1A of the embodiment and an enlarged view of its region A. [Figure 2] Figure 2 is an unfolded view of the bag body and fastening member of the drip bag 1A of the embodiment. [Figure 3A]Figure 3A is an enlarged view of region B of the drip bag 1A of the embodiment shown in FIG. 1. [Figure 3B] Figure 3B is an enlarged view of a modified form of region B of the drip bag 1A of the embodiment shown in FIG. 1. [Figure 3C] Figure 3C is an enlarged view of a modified form of region B of the drip bag 1A of the embodiment shown in FIG. 1. [Figure 3D] Figure 3D is an explanatory diagram of the operation when the drip bag 1A of the embodiment shown in FIG. 1 is opened. [Figure 4A] Figure 4A is an explanatory diagram of the method for opening the drip bag 1A. [Figure 4B] Figure 4B is an explanatory diagram of the method for opening the drip bag 1A. [Figure 4C] Figure 4C is an explanatory diagram of the method for opening the drip bag 1A. [Figure 5] Figure 5 is a perspective view of the opened drip bag 1A in a state of being hooked on a cup. [Figure 6] Figure 6 is a perspective view of a roll of the sheet for manufacturing the drip bag 1A. [Figure 7] Figure 7 is an explanatory diagram of the manufacturing method of the drip bag 1A. [Figure 8] Figure 8 is a plan view of the drip bag 1B and an enlarged view of its region C. [Figure 9] Figure 9 is a plan view of the drip bag 1C. [Figure 10] Figure 10 is a plan view of the sheet for manufacturing the drip bag 1C.

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals denote the same or equivalent components.

[0015] (Overall Configuration of Drip Bag) Figure 1 is a plan view of an unopened drip bag 1A according to one embodiment of the present invention and an enlarged view of its region A; Figure 2 is an unfolded view of the bag body 11 and latching member 20 of the drip bag 1A; and Figure 3A is an enlarged view of region B of the drip bag 1A. Figures 4A, 4B, and 4C are explanatory diagrams of how to open the drip bag 1A; and Figure 5 is a perspective view of an opened drip bag 1A latched onto a cup 100.

[0016] In the figures, the areas with dot hatching represent the water-permeable filter sheet 10 of the bag body 11. Also, in Figure 1, the areas with fine diagonal hatching represent the sealed edges of the bag body 11, and in Figure 2, the areas with coarse diagonal hatching represent the adhesion area between the water-permeable filter sheet 10 and the fastening member 20. Note that the adhesion area between the water-permeable filter sheet 10 and the fastening member 20 is not normally visible from the fastening member side due to the opacity of the thin plate-like material that constitutes the fastening member 20.

[0017] This drip bag 1A comprises a bag body 11 formed in the shape of a flat bag from a water-permeable filter sheet 10, a fastening member 20 made of a thin plate-like material provided on the outer surfaces of two opposing sides of the bag body 11, and the extraction material filled in the bag body 11. The fastening member 20 has a fastening portion 21 that can be pulled up from the bag body 11. After opening the drip bag 1A, the drip bag 1A is fastened to the cup 100 by hooking the fastening portion 21 onto the opening edge of the cup 100 (Figure 5).

[0018] Drip bag 1A has an opening perforation 30 formed along the top edge 2 of drip bag 1A.

[0019] (Perforations for opening) The drip bag of the present invention has a distinctive configuration in the formation area and shape of the opening perforation 30. Specifically, the opening perforation 30 is formed along the upper edge 2 of the drip bag 1A, from one of the pair of opposing side edges 3a and 3b of the drip bag 1A to the other, and has an overlapping area with the perforation 31 of the bag body 11 and the perforation 32 of the fastening member 20, and has a convex shape S1 in the center in the width direction of the drip bag.

[0020] It is preferable that the perforations 32 formed in the fastening member 20 form an overlapping region. In a plan view of the drip bag, it is preferable that the perforations 31 of the bag body 11 and the perforations 32 of the fastening member 20 overlap in the overlapping region, so that the opening perforation 30 is a single, unbranched perforation.

[0021] In the drip bag 1A of this embodiment, the convex shape S1 of the opening perforation 30 is a convex shape on the lower edge 4 side of the drip bag 1A. This convex shape S1 is formed at a position that coincides with the center line Lc of the width of the drip bag 1A. Preferably, the vertex P1 of the convex shape S1 is within 1 / 10, more preferably 1 / 20 of the width W1 of the drip bag 1A from the center line Lc of the width W1 of the drip bag 1A, and even more preferably the vertex P1 is on the center line Lc of the width of the drip bag 1A. Because the convex shape S1 is formed in the center of the width of the drip bag 1A in this way, as will be described later, the opening perforation 30 can be easily opened by pinching the upper side (upper edge 2 side) and lower side (lower edge 4 side) of the opening perforation 30 with your fingers and folding the drip bag 1A along the opening perforation 30 (Figures 4A to 4C).

[0022] The convex shape S1 is preferably V-shaped or U-shaped, and more preferably V-shaped S2 (Figure 1). In particular, it is preferable that the vertex of the V-shape is the vertex P1 of the convex shape S1.

[0023] Furthermore, the perforations 31 of the bag body 11 and the perforations 32 of the fastening member 20 that constitute the opening perforations 30 may have the same mesh size, but it is preferable that the cut portion of the perforations 32 of the fastening member 20 is longer than that of the perforations 31 of the bag body 11, and in particular, it is preferable that the convex shape S1 is formed only by the cut portion. The length of the cut portion of the perforations 31 of the bag body 11 is restricted in order to prevent the extraction material filled in the bag body 11 from leaking out. On the other hand, the cut portion of the perforations 32 of the fastening member 20 can be made longer in order to facilitate the breaking of the opening perforations 30.

[0024] The perforations 30 for opening the bag preferably have steps 33 at the base on both sides of the convex shape S1 (Figure 3A). In this stepped structure, the inclination of the perforations closer to the sides 3a and 3b of the drip bag than the steps 33 is different from that of the perforations closer to the center line Lc than the steps 33, but the inclination of these perforations may be the same.

[0025] As shown in Figure 4A, when opening the drip bag 1A, the upper edge 2 and lower edge 4 of the perforation 30 are pinched, and the tip of the convex shape S1 is pushed against the paper surface of the latching member 20. The perforations 30 on both the left and right sides of the convex shape S1 become the pivot axis 34. However, if steps 33 are provided at both the left and right ends of the convex shape S1, as shown in Figure 3D, the perforations 30 on both the left and right sides of the steps 33 become the pivot axis 34. Furthermore, it becomes easier to form the apex P1 of the convex shape S1 closer to the lower edge 4 than the extension line obtained by extending the pivot axis 34 toward the center line Lc, and as a result, as shown in Figure 3D, the tip of the convex shape S1 is more easily pushed in when opening. Therefore, when opening the drip bag by folding it, the first tear of the opening perforation 30 is more likely to occur at the top of the convex shape S1.

[0026] To make the initial tearing of the opening perforation 30 easier when opening, it is preferable to form the step 33 at the bending points P2 and P3 of the opening perforation 30, as shown in Figure 3A. However, the step 33 may also be formed by curving the opening perforation 30, as shown in Figure 3B. The opening perforation 30 may have multiple steps 33, as shown in Figure 3C.

[0027] In this invention, the perforation 30 for opening may have a convex shape S1' on the upper side 2 of the drip bag, as shown in Figure 8 for the drip bag 1B. The preferred embodiment of the drip bag 1A shown in Figure 1A, in which the perforation 30 for opening has a convex shape S1 on the lower side 4 of the drip bag, also applies to this drip bag 1B.

[0028] (Bag body) The bag body 11 is formed from a water-permeable filterable sheet. The bag body 11 is filled with coffee grounds, tea leaves, or extracting materials such as herbal medicine.

[0029] In this embodiment, the bag body 11 of the drip bag 1A is a three-sided sealed bag with a rectangular shape in plan view. One side 3b of the drip bag 1A forms the fold of the water-permeable filter sheet 10, while the other side 3a, the top 2, and the bottom 4 of the drip bag 1A form the sealing edges of the water-permeable filter sheet on the surface and the water-permeable filter sheet on the back of the bag body 11. In this invention, the top 2 of the drip bag may also be formed by the fold of the water-permeable filter sheet. The sealing width at the sealing edge can be set as appropriate; for example, if sealing is done by ultrasound, it can be 0.3 to 0.6 mm.

[0030] The planar dimensions of the bag body 11 can be appropriately set according to the size of the cup or container to which the drip bag will be attached. For example, it can be made to a size that can be used with commercially available coffee cups. Gussets may be provided at the bottom and sides of the bag body 11 as needed.

[0031] As the water-permeable filter sheet 10, various materials can be used that, for example, allow extraction of a predetermined amount of extraction material such as coffee grounds, tea leaves, or herbal medicine when hot water is poured over it. Generally, known materials for extraction sheets include synthetic fibers such as polyester, nylon, polyethylene, polypropylene, and vinylon; semi-synthetic fibers such as rayon; woven or nonwoven fabrics made from single or composite fibers of natural fibers such as mulberry and mitsumata; mixed paper made from Manila hemp, wood pulp, polypropylene fibers, etc.; and paper such as tea bag base paper. These can also be used in the present invention, but from the viewpoint of disposal after use of the drip bag, it is preferable to include biodegradable fibers in the water-permeable filter sheet material. Examples of biodegradable fibers include polylactic acid, polybutylene succinate, and polyethylene succinate. Furthermore, in order to impart an appropriate pre-infusion effect to the coffee grounds during brewing, when manufacturing a water-permeable filterable sheet from these fibrous materials, it is preferable to adjust the porosity of the fibrous layer to create a multi-layer structure with a "sparse" layer that comes into direct contact with the coffee grounds and a "dense" layer that does not come into direct contact with the coffee grounds, and to increase the content of hydrophobic fibers in the layer that comes into direct contact with the coffee grounds and decrease the content of hydrophobic fibers in the layer that does not come into direct contact with the coffee grounds (Patent No. 3674486).

[0032] (Locking member) The latching member 20 is formed from a thin sheet material such as cardboard or a plastic sheet. From the standpoint of easy disposal after use of the drip bag 1A, it is preferable to use a biodegradable material such as polylactic acid, polybutylene succinate, or polyethylene succinate as the thin sheet material.

[0033] As shown in Figure 1, the drip bag 1A of this embodiment has an upper adhesive portion 22 on the upper side 2 of the drip bag beyond the opening perforation 30. Furthermore, on the lower side 4 of the drip bag beyond the opening perforation 30, there is an opening end support adhesive portion 23, a first central adhesive portion 24 extending from the center of the opening end support adhesive portion 23 toward the lower side 4 of the drip bag 1A, a concave second central adhesive portion 25 adjacent to the lower end of the first central adhesive portion 24, a latching portion 21 adjacent to both sides of the first central adhesive portion 24 and surrounding the second central adhesive portion 25, and reinforcing portions 26 extending toward the lower side 4 from both the left and right ends of the opening end support adhesive portion 23.

[0034] The upper attachment portion 22, the attachment portion 23 for supporting the opening end, the first central attachment portion 24, the second central attachment portion 25, and the reinforcing portion 26 are attached to and fixed to the bag body 11 by the attachment areas shown by coarse hatching in Figure 2. The latching portion 21 is retractable from the bag body 11 and has a lifting axis 21a near the lower end of the first central attachment portion 24. After opening the bag body 11 with the opening perforations 30, the latching portion 21 can be lifted from the bag body 11, making it possible to latch the drip bag 1A onto the cup 100 by the latching portion 21, as shown in Figure 5.

[0035] The upper adhesive portions 22 on the front and back of the bag body 11 are continuous along one side of the drip bag 1A, and this continuous portion 22a forms a fold in the thin plate-like material. A notch 28 is formed in the continuous portion 22a (Figure 2), facilitating the formation of the fold in the upper adhesive portion 22. By making the fastening members 20 on the front and back of the bag body 11 continuous, it is preferable to suppress misalignment when placing the fastening members 20 in a predetermined location on the water-permeable filterable sheet 10 during the production of the drip bag manufacturing sheet 40A (Figure 7), which will be described later. In particular, since the continuous portion 22a is located on the upper side 2 of the drip bag rather than the opening perforation 30, the continuous portion 22a does not remain on the bag body 11 after the bag body 11 has been opened at the opening perforation 30. Therefore, it is preferable that the continuous portion 22a does not leave any effect such as distorting the opening shape of the bag body 11.

[0036] Furthermore, in this embodiment, the upper edge of the upper adhesive portion 22 protrudes towards the upper edge 2 of the drip bag at the center in the width direction of the drip bag, and the thickness of the upper adhesive portion 22 is greater at the center D1a than at both ends D1b (Figure 3A). As a result, as shown in Figures 4A to 4C, when pinching the upper and lower sides of the opening perforation 30 at the center in the width direction of the drip bag and folding the drip bag 1A along the opening perforation 30 to break the opening perforation 30, the upper side of the opening perforation 30 becomes easier to pinch, making it easier to fold the drip bag 1A.

[0037] In the adhesive portion 23 for supporting the opening end, a notch 27 is formed in an inverted V-shape, diagonally downwards towards the center line Lc, from near the end (bending point P2) of the convex shape S1 of the opening perforation 30. The straight line L1 connecting the intersection point P4 of the outer shape 21b of the hooking portion 21 adjacent to both sides of the first central adhesive portion 24 and the outer shape 21c of the hooking portion 21 that is horizontally in contact with the adhesive portion 23 for supporting the opening end, and the aforementioned bending point P3 of the opening perforation 30, intersects with the notch 27 within the adhesive portion 23 for supporting the opening end (Figure 3A). When the drip bag 1A shown in Figure 5 is opened, the hooking portion 21 pulls the hooking members 20 on the front and back of the bag body 11 in opposite directions, and the adhesive portion 23 for supporting the opening end bends at the notch 27, so that the opening shape of the drip bag 1A becomes approximately hexagonal, and a large opening area can be obtained. Furthermore, the aforementioned intersection causes a twisting force to act on the notch 27, and when the fastening members 20 on the front and back of the bag body 11 are pulled in opposite directions, the tensile force applied near the upper end of the notch 27 is dispersed by the twist. Therefore, the risk of the upper end of the notch 27 breaking and the opening shape becoming distorted can be reduced.

[0038] (How to use) As shown in Figure 4A, the method of using this drip bag 1A is to first pinch the opening perforation 30 at the center of the width of the drip bag 1A, on the upper side 2 and the lower side 4 of the drip bag, and fold the drip bag 1A along the opening perforation 30. Since the opening perforation 30 is formed from one side to the other of a pair of opposing sides of the drip bag, it is easy to fold the drip bag 1A along the opening perforation 30. In contrast, if the opening perforation, as described in Patent Document 3, has an opening start end and an end end on the upper side of the drip bag, it is not possible to apply force to the opening perforation by folding the drip bag, and it can only be opened by pinching.

[0039] Because the opening perforation 30 has a convex shape, the force used to fold the drip bag 1A along the opening perforation 30 is concentrated at the top of the convex shape S1 of the opening perforation 30, and the tearing of the opening perforation 30 begins from the top of the convex shape S1.

[0040] As shown in Figure 4B, the break at the top of the convex shape S1 immediately proceeds toward both ends of the opening perforation 30, and as shown in Figure 4C, the opening perforation 30 is completely broken, allowing the upper part of the opening perforation 30 to be removed.

[0041] In this way, by folding the drip bag 1A along the opening perforation 30, the top of the convex shape S1 of the opening perforation 30 is broken, and this break progresses toward both ends of the opening perforation. Therefore, there is no risk of the contents scattering when both ends of the opening perforation break. As a result, there is no need to worry about the contents scattering, and the drip bag 1A can be opened without having to particularly adjust the force used to open it.

[0042] After opening the drip bag 1A, as shown in Figure 5, the fastening parts 21 on the front and back of the bag body 11 can be pinched and pulled in opposite directions, allowing the fastening parts 21 to be attached to the cup 100.

[0043] When the drip bag 1A is placed over the cup 100, the top of the bag body 11 is fully opened by the opening perforations 30 that run from one end to the other on both sides of the drip bag 1A. This results in a large opening area, making it easy to pour hot water from the drip bag 1A.

[0044] (Manufacturing method) In order to manufacture the drip bag 1A of this embodiment using a filling and packaging machine, it is preferable to prepare a roll of the drip bag manufacturing sheet 40A shown in Figure 6.

[0045] In Figure 6, the area separated by the dashed line represents the region of one drip bag 1A.

[0046] The drip bag manufacturing sheet 40A is placed in a filling and packaging machine, and both sides of the drip bag manufacturing sheet 40A are joined and sealed (vertical seal) in a conventional manner, forming the drip bag manufacturing sheet 40A into a cylindrical shape as shown in Figure 7. Extract is then filled into this cylindrical shape, and horizontal sealing (lateral seal) is performed alternately. In this way, drip bags 1A can be easily manufactured industrially.

[0047] (Transformation patterns) The drip bag 1A of the present invention can take on various modified forms.

[0048] For example, the drip bag 1B shown in Figure 8 has a convex shape S1 of the opening perforation 30 in the drip bag 1A shown in Figure 1A, but this convex shape is on the upper side 2 of the drip bag 1B. Even when the opening perforation 30 is formed with a convex shape S1' on the upper side 2 in this way, the opening perforation 30 can be opened just as easily as when the convex shape S1 is on the lower side 4 of the drip bag.

[0049] Similar to the drip bag 1A shown in Figure 1A, this drip bag 1B can also take various forms. For example, it is preferable that the top of the convex shape S1' coincides with the center line Lc of the drip bag, and that the convex shape S1' has an inverted V shape S2'. It is also preferable to create a step 33 in the opening perforation 30 by bending the opening perforation 30 at bending points P2 and P3.

[0050] The drip bag 1C shown in Figure 9 is a modified version of the drip bag 1A shown in Figure 1A, in which the fastening members 20 on the front and back of the bag body 11 are connected along the upper edge 2 of the drip bag 1C, so that the fastening members 20 on the front and back are contained inside the side edges 3a and 3b of the drip bag.

[0051] Figure 10 is a plan view of the manufacturing sheet 40C for this drip bag 1C.

[0052] This arrangement, where the front and back drip bags 1C of the bag body 11 are connected at the upper edge 2 of the drip bag 1C, and the upper edge 2 is formed by the fold of the fastening member, is preferable because it suppresses misalignment of the drip bag 1C during the manufacturing of the drip bag manufacturing sheet 40C. Furthermore, similar to the drip bag 1A described above, after opening the perforation 30, the continuous portion of the front and back drip bags does not remain on the bag body 11, and the wide opening shape is not distorted by the continuous portion of the fastening member remaining on the bag body 11.

[0053] In the present invention, the structure for attaching the bag body 11 to the cup is not limited to the attachment portion 21 raised from the bag body as shown in Figure 1A. For example, as shown in Patent Document 2, the attachment piece may protrude from the surface of the bag body 11 by applying force to both sides of the bag body 11 to compress it.

[0054] As described in Japanese Patent No. 4079041, the latching portion may be formed from an arm portion that is retractable from the bag body at the center of the width direction of the drip bag and a latching piece that is continuous with the upper end of the arm portion, with the lower edge of the arm portion serving as the axis for retraction.

[0055] In the drip bag of the present invention, the various modifications described above can be appropriately combined. [Explanation of Symbols]

[0056] 1A, 1B, 1C Drip Bags 2. Top edge of the drip bag 3a, 3b Side of the drip bag 4. Bottom edge of the drip bag 10. Water-permeable filtration sheet 11 Bags 20. Locking member 21 Latch part 21a Axis of initiation 21b, 21c Outline of the latching part 22 Upper adhesive part 22a Continuous portion of the upper adhesive area on both sides 23 Adhesive part for opening end support 24 1st center adhesive part 25 2nd center adhesive part 26 Reinforcement section 27, 28 cuts 30 perforations for opening 31 Perforations on the bag itself 32 Perforations on the fastening member 33 steps 34 pivot shafts 40A, 40C Drip Bag Manufacturing Sheets 100 cups D1a Thickness of the central part of the upper adhesive area D1b Thickness of both ends of the upper adhesive portion L1 is a straight line connecting points P3 and P4. Lc Drip Bag Width Centerline P1 is the vertex of a convex shape, the vertex of a V-shape. P2, P3 Perforation points for opening P4 intersection R1 area S1, S1' convex shape S2 V-shaped S2' Inverted V shape W1 Drip bag width

Claims

1. A drip bag comprising a bag body formed of a water-permeable filterable sheet, fastening members made of a thin plate-like material provided on the outer surfaces of two opposing sides of the bag body, and an extraction material filled in the bag body, The perforations for opening the drip bag are formed along the top edge of the drip bag, from one of the pair of opposing sides of the drip bag to the other. The perforations for opening the bag have an overlapping area between the perforations of the bag body and the perforations of the fastening member. The perforations for opening the drip bag have a convex shape, either on the upper side or the lower side. The convex shape coincides with the center line of the width of the drip bag. Drip bags.

2. The drip bag according to claim 1, wherein the apex of the convex shape is within 1 / 10 of the width of the drip bag from the center line of the width of the drip bag.

3. The drip bag according to claim 1 or 2, wherein the cut portion of the perforation of the fastening member is longer than the perforation of the bag body.

4. The drip bag according to claim 1 or 2, wherein the perforations of the latching member in the convex shape are formed only at the cut portion.

5. The drip bag according to claim 1 or 2, having a V-shaped convex form.

6. The drip bag according to claim 1 or 2, wherein the convex shape has steps at the base on both sides thereof.

7. The drip bag according to claim 1 or 2, wherein the latching members on two opposing sides are continuous closer to the top edge of the drip bag than the perforations for opening.

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