Extraction bag

Abstract

To maintain a folded state of a free end of a grip part by a simple operation in a tea bag type extraction bag in which the free end of the grip part is folded in two during extraction.SOLUTION: An extraction bag 1A includes: a bag body 11 formed from a water-permeable filter sheet; a thin plate-like member 20 provided on the outer surface of the bag body; and an extraction material A filled in the bag body. The bag body 11 has two opposing surfaces, and the thin plate-like member 20 has: a grip part 30 provided on one of the two surfaces; and a fixing part 21 fixed to the bag body adjacent to the grip part 30 on an upper side of the bag body. An upper end of the grip part 30 is fixed to the bag body 11, the lower part can be lifted up from the bag body 11, and at least the lower part of the grip part 30 has a fold line L1 that bisects the width of the grip part 30. A pair of notches 40A and 40B are formed on both side edge parts of the grip part 30, and engage when the grip part 30 is folded in half and twisted.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

[0001] The present invention relates to an extraction bag in which an extraction material packed in a bag body made of a water-permeable filter sheet is immersed in hot water to obtain an extract. [Background technology]

[0002] Traditionally, tea bags, which are water-permeable bags with a hanging string filled with tea leaves, have been widely used to easily brew beverages such as green tea, black tea, and oolong tea. For coffee, in addition to drip-type extraction bags in which hot water is poured over coffee powder, tea bag-type coffee extraction bags in which the bag filled with coffee powder is immersed in hot water are also used.

[0003] When immersing a tea bag-type coffee extraction bag in hot water, the coffee powder contains carbon dioxide, which causes the bag body filled with coffee powder to float up in the hot water, making it difficult to extract the coffee sufficiently. Therefore, a hook piece made of a thin plate-like member has been proposed, which is attached to one side of the bag body filled with coffee powder, and which can be hooked onto the edge of a cup to prevent the bag body filled with coffee powder from floating up in the hot water (Patent Document 1).

[0004] However, as described in Patent Document 1, even if a user grasps a hook piece made of a thin plate-like material such as kraft paper and tries to forcibly submerge the bag body in hot water when it tries to float up, the thin plate-like material bends and warps, making it difficult to submerge the bag body in hot water. Even if the hook piece protruding from the cup is moved up and down to promote coffee extraction, the bag body in the hot water does not move up and down in the same way as the hook piece. Furthermore, even if the bag body temporarily submerges in hot water, only the surface layer of the coffee powder filled in the bag body swells with hot water, making it difficult for the hot water to penetrate the entire coffee powder. Therefore, with tea bag-type extraction bags, in which the bag body is immersed in hot water, it is difficult to obtain coffee liquid of the same strength as drip-type coffee in the same or shorter time as drip-type coffee.

[0005] In response to this, teabag-type extraction bags have been proposed that have a handle made of a thin plate-like material attached to one side of the bag body, with the upper part of the handle fixed to the bag body and the lower part liftable from the bag body, and a specific fold line at the liftable part (Patent Documents 2 and 3). With these extraction bags, the part near the free end of the handle lifted from the bag body folds in half to form a rigid rod, making it easy to grasp the handle and submerge the bag body in hot water or move it up and down in hot water. Furthermore, when the handle is lifted from the bag body, the top edge of the bag body bends, separating the front and back surfaces of the bag body, creating a headspace in the bag body, which makes it easier for hot water to enter the bag body, allowing the hot water to penetrate not only the surface but also the interior of the brewing material inside the bag body, promoting extraction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3140084 [Patent Document 2] Patent No. 7271038 [Patent Document 3] Patent No. 7224609 Summary of the Invention [Problem to be solved by the invention]

[0007] However, with the extraction bags of Patent Documents 2 and 3, when the user releases the grip during extraction, the angle of the opposing surfaces of the folded grip widens, so when raising or lowering the bag body immersed in hot water to concentrate the extract, it is necessary to fold the free end of the grip in half again before raising or lowering the grip. Furthermore, the widening of the angle of the opposing surfaces of the folded grip weakens the degree of bending of the top edge of the bag body, reducing the volume of the bag body and reducing the permeability of hot water to the extraction material inside the bag body.

[0008] In contrast, the object of the present invention is to provide a tea bag-type extraction bag in which the free end of the handle, which can be lifted from the bag body and folded in half during extraction, that can maintain the folded state of the free end of the handle with a simple operation even when the hand is released from the handle during extraction. [Means for solving the problem]

[0009] The inventors came up with the idea that if notches are provided on both sides of the portion of the handle near the free end, which engage with each other when the free end of the handle is folded in half and then gently twisted, the folded state of the free end of the handle can be easily maintained by a series of operations: folding the handle in half with one hand, followed by gently twisting the handle, and thus completed the present invention.

[0010] That is, the present invention provides an extraction bag having a bag body formed from a water-permeable filterable sheet, a thin plate-like member provided on the outer surface of the bag body, and an extraction material filled in the bag body, The bag body has two opposing surfaces, the thin plate-like member has a gripping portion provided on one of the two surfaces and a fixing portion fixed to the bag body adjacent to the gripping portion on the upper side of the bag body, The gripping portion has an upper end fixed to the bag body and a lower end that can be lifted up from the bag body, A folding line is formed at least in the lower part of the gripping portion, dividing the width of the gripping portion into two halves, The extraction bag has a pair of notches formed on both side edges of the grip portion, which engage when the grip portion is folded in half and twisted. [Effects of the Invention]

[0011] According to the extraction bag of the present invention, when using the extraction bag, the width of the grip portion is folded in half along the folding line, and then the grip portion is twisted, and the notches on both side edges of the grip portion are engaged by a series of simple operations.

[0012] In particular, in an embodiment in which the notch has a specific shape, the notch engages whether the folded handle is twisted left or right, making it extremely easy to engage the notch regardless of the user's tendency to twist the notch left or right.

[0013] By engaging the notch, the bag body bends, increasing its volume and improving the penetration of hot water into the brewing material inside the bag body. Therefore, by engaging the notch during brewing, the handle remains folded in half even when the handle is released, allowing the bag body to be maintained in a shape suitable for brewing.

[0014] In particular, if the upper edge of the widthwise center of the gripping portion (the upper edge of the center of the gripping portion closer to the upper edge of the bag body) is separated from the fixing portion and has a central protrusion, the central protrusion can be hooked onto the cup when the gripping portion is raised so that the longitudinal direction of the gripping portion is aligned with the vertical direction of the bag body. Here, if a pair of vertical fold lines is formed in the fixing portion of the thin plate-like member, when the gripping portion is folded in half, the fixing portion of the thin plate-like member is bent by the vertical fold lines, and the fixing portion conforms to the inner wall of the cup. Therefore, the hooking state of the extraction bag is stable.

[0015] In addition, in an embodiment in which the fixing part and the gripping part have a specific shape, when the gripping part is lifted from the bag body, the angle of the longitudinal direction of the gripping part relative to the vertical direction of the bag body becomes approximately perpendicular, and the upper end of the bag body is pressed down by the fixing part, expanding the head space and the volume of the bag body. This allows a sufficient amount of hot water to pass through the bag body, allowing an extract of the desired concentration to be obtained in a short time.

[0016] After releasing the gripping portion, when gripping the gripping portion again to raise or lower the bag body immersed in hot water or to pull the extraction bag out of the extraction liquid, the user can simply grip the gripping portion that remains folded in half, eliminating the need to fold the gripping portion in half. [Brief explanation of the drawings]

[0017] [Figure 1]FIG. 1 is a development view of an extraction bag 1A according to an embodiment. [Figure 2A] FIG. 2A is a front view of the extraction bag 1A of the embodiment and an enlarged view of the notch. [Figure 2B] FIG. 2B is a rear view of the extraction bag 1A of the embodiment. [Figure 3] FIG. 3 is an explanatory diagram of the operation of engaging the notches in the extraction bag 1A of the embodiment. [Figure 4] FIG. 4 is a close-up view of the engaged notch. [Figure 5A] FIG. 5A is a perspective view of the extraction bag 1A of the embodiment in which the handle is lifted from the bag body so that the longitudinal direction of the handle is approximately perpendicular to the up-down direction of the bag body, and the bag is placed in a cup. [Figure 5B] FIG. 5B is a side view of the extraction bag 1A of the embodiment in which the handle is lifted from the bag body so that the longitudinal direction of the handle is approximately perpendicular to the up-down direction of the bag body, and the bag is placed in a cup. [Figure 5C] FIG. 5C is a side view of the extraction bag 1A of the embodiment in a state where the grip portion is raised so that the longitudinal direction of the grip portion is aligned with the up-down direction of the bag body. [Figure 5D] FIG. 5D is a perspective view of the extraction bag 1A of the embodiment in a state where the central protrusion of the gripping portion is hooked onto the opening edge of the cup. [Figure 5E] FIG. 5E is a top view of the extraction bag 1A of the embodiment in a state where the central protrusion of the gripping portion is hooked onto the opening edge of the cup. [Figure 6] FIG. 6 is a development view of the extraction bag 1B of the embodiment. [Figure 7] FIG. 7 is a side view of the extraction bag 1B of the embodiment with the free end of the gripping portion raised. [Figure 8] FIG. 8 is a plan view of a sheet for manufacturing the extraction bag 1A of the embodiment. [Figure 9] FIG. 9 is an explanatory diagram of a manufacturing method of the extraction bag 1A of the embodiment. [Figure 10] FIG. 10 is an explanatory diagram of a manufacturing method of the extraction bag 1A of the embodiment. [Figure 11]FIG. 11 is a front view of the extraction bag 1C of the embodiment and an enlarged view of the notch. [Figure 12] FIG. 12 is a front view of the extraction bag 1D of the embodiment and an enlarged view of the notch. [Figure 13] FIG. 13 is a front view of the extraction bag 1E of the embodiment. [Figure 14] FIG. 14 is a front view of the extraction bag 1F of the embodiment. [Figure 15] FIG. 15 is a front view of the extraction bag 1G of the embodiment. [Figure 16] FIG. 16 is a development view of the extraction bag 1H of the embodiment. [Figure 17A] FIG. 17A is a perspective view of the extraction bag 1H of the embodiment in which the grip portion is raised from the bag body so that the longitudinal direction of the grip portion is approximately perpendicular to the up-down direction of the bag body, and the bag body is placed in a cup. [Figure 17B] FIG. 17B is a perspective view of the extraction bag 1H of the embodiment in a state where the grip portion is raised so that the longitudinal direction of the grip portion is aligned with the up-down direction of the bag body. [Figure 17C] FIG. 17C is a top view of the extraction bag 1H of the embodiment in a state where the grip portion is raised so that the longitudinal direction of the grip portion is aligned with the up-down direction of the bag body. [Figure 18] FIG. 18 is a development view of the extraction bag 1I of the embodiment. [Figure 19] FIG. 19 is a perspective view of an example of an extraction bag 1I placed in a cup. [Figure 20] FIG. 20 is a development view of the extraction bag 1J of the embodiment. [Figure 21A] FIG. 21A is a perspective view of an example extraction bag 1J placed in a cup. [Figure 21B] FIG. 21B is a perspective view of the extraction bag 1J of the embodiment in a state where the gripping portion is engaged with the opening edge of the cup. [Figure 21C] FIG. 21C is a perspective view of the extraction bag 1J of the embodiment in a state where the gripping portion is engaged with the opening edge of the cup. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will now be described in detail with reference to the drawings, in which the same reference numerals denote the same or equivalent components.

[0019] (Overall composition) FIG. 1 is a development view of an extraction bag 1A according to one embodiment of the present invention, in which the upper and lower edges of the bag body 11 are continuous. FIG. 2A is a plan view of the extraction bag 1A with the gripping portion 30 unfolded, and FIG. 2B is a rear view thereof. FIG. 2A also shows an enlarged view of a pair of notches 40A and 40B. In FIGS. 1 and 2A, the areas shaded with fine diagonal lines represent the adhesion area between the bag body 11 and the thin plate-like member 20, the areas shaded with coarse diagonal lines represent the seal area between the front and back water-permeable filterable sheets forming the bag body 11, and the areas shaded with dots represent the surface of the water-permeable filterable sheet forming the bag body 11. Note that the adhesion area in the present invention is not limited to the illustrated embodiment. Furthermore, the adhesion area between the water-permeable filterable sheet and the thin plate-like member is usually not visible from the thin plate-like member side due to the opacity of the thin plate-like member.

[0020] The extraction bag 1A of this embodiment includes a bag body 11 formed from a water-permeable filterable sheet, a thin plate-like member 20 attached to the outer surface of the bag body 11, and an extraction material filled within the bag body 11. The bag body 11 has two opposing surfaces. The thin plate-like member 20 has a handle 30 attached to one of the two surfaces of the bag body and a fixed portion 21 adjacent to the handle 30 on the side of the upper edge 11a of the bag body. The fixed portion 21 is fixed to the bag body 11 by adhesive. Reinforcement portions 25 extend from both left and right sides of the fixed portion 21 toward the bottom edge 11b of the bag body via horizontal fold line L4. The lower end of the reinforcing portion 25 is preferably positioned at or near the lower end of the handle 30 in the vertical direction of the bag body. In the extraction bag 1A of this embodiment, the reinforcing portion 25 is located closer to the upper side 11a of the bag body than the lower end of the gripping portion 30, but the lower end of the reinforcing portion 25 may be located closer to the bottom side 11b of the bag body than the lower end of the gripping portion 30, or the lower part of the reinforcing portion 25 may surround the lower part of the gripping portion 30. By extending the reinforcing portion 25 from the fixing portion 21 to the lower end of the gripping portion 30 or its vicinity in terms of its vertical position on the bag body 11, it is possible to prevent the bag body from floating up during extraction. 5B and 5C, when gripping portion 30 is raised, the upper end of bag body 11 is pressed down by fixing portion 21, expanding the head space and the volume of bag body 11. This allows a sufficient amount of hot water to pass through bag body 11.

[0021] The upper end of the gripping portion 30 is connected to the fixing portion 21 so that the gripping portion 30 is fixed to the bag body 11 , and the lower end of the gripping portion 30 is a free end that can be lifted up from the bag body 11 .

[0022] The grip portion 30 has a folding line L1 on the center line L0 of the width of the grip portion 30, which bisects the width of the lower part of the grip portion 30. A pair of notches 40A, 40B are formed on both side edges of the grip portion 30, which engage when the width of the grip portion 30 is folded in half and twisted. In the present invention, the folding lines can be formed by perforation, half-cutting, creasing, or the like.

[0023] The fixing portion 21, the reinforcing portion 25, and the gripping portion 30 are formed by cutting a single sheet of thin plate-like material. Examples of the thin plate-like material include paperboard and plastic sheets. From the viewpoint of disposability after use of the extraction bag 1A, it is preferable to use a biodegradable material such as polylactic acid, polybutylene succinate, or polyethylene succinate as the thin plate-like material.

[0024] On the other hand, the bag body 11 is a flat bag that is rectangular in plan view, and the upper side 11a is formed by the fold of the water-permeable filterable sheet 10. Note that in the present invention, the bag body 11 is not limited to a flat bag, and is not limited to a rectangular shape in plan view. For example, the bottom may have a gusset.

[0025] Various types of water-permeable filter sheets can be used, for example, those that can be filled with a predetermined amount of extraction material and allow the extraction material to leach out when hot water is poured into them. Commonly known infusion sheets include woven or nonwoven fabrics made from synthetic fibers such as polyester, nylon, polyethylene, polypropylene, and vinylon, semi-synthetic fibers such as rayon, and natural fibers such as paper mulberry and mitsumata, as well as mixed papers made from Manila hemp, wood pulp, and polypropylene fibers, and paper such as tea bag base paper. These can also be used in the present invention, but from the perspective of disposability after use of the extraction bag, it is preferable for the water-permeable filter sheet material to contain biodegradable fibers. Examples of biodegradable fibers include polylactic acid, polybutylene succinate, and polyethylene succinate.

[0026] The brewing material filled in the bag body 11 may include coffee powder, tea leaves, or herbal medicine.

[0027] (Details of the fixing part) The fixing portion 21 has an inverted trapezoidal notch 22 in the center of its upper edge, and upper edges 21a on both sides of the fixing portion 21 protrude from the upper edge 11a of the bag body. As will be described later in the method of using the extraction bag 1A, when the gripping portion 30 is folded in half along the folding line L1 and its free end is lifted up from the bag body 11 so that the longitudinal direction of the gripping portion 30 becomes approximately perpendicular to the up-down direction of the bag body 11 as shown in Figures 5A and 5B, the upper end of the fixing portion 21 pushes in and folds the upper end 11u of the bag body 11, thereby increasing the head space of the bag body 11.

[0028] Meanwhile, the lower base 22a of the inverted trapezoidal notch 22 is closer to the bottom edge 11b of the bag body 11 than the top edge 11a. The fixing portion 21 has a pair of vertical fold lines L3 extending from both ends of the lower base 22a toward the bottom edge 11b of the bag body. When the handle portion 30 is folded in half along the fold lines L1 and its free end is pulled up significantly from the bag body 11, as shown in FIG. 5C , the longitudinal direction of the handle portion 30 is aligned approximately vertically relative to the bag body 11. Due to the presence of the vertical fold lines L3, the fixing portion 21 is bent into a trapezoidal shape in a top view of the extraction bag 1A. The engagement of the notches 40A and 40B locks the trapezoidal bent shape of the fixing portion 21 in a top view, stabilizing the overall shape of the thin plate-like member 20. In this state, the lower portion of the trunk of the bag body 11 expands. Therefore, in this state, the grip portion 30 can be moved up and down during extraction, and the bag body 11 can be moved up and down within the hot water in the cup 100, thereby facilitating extraction.

[0029] Furthermore, when the gripping portion 30 is raised so that its longitudinal direction is aligned with the vertical direction of the bag body 11, the central protrusion 31, which will be described later, becomes a downward protrusion away from the surface of the bag body 11, as shown in Fig. 5C. Therefore, as shown in Fig. 5D, the tips 32a and 32b of the central protrusion 31 can be hooked onto the wall of the opening of the cup 100. In this hooked state, the fixing portion 21 is bent as described above, and therefore can be made to conform to the shape of the opening of the cup 100, as shown in Fig. 5E. This improves the stability of the hooked state.

[0030] The fixing portion 21 has a bifurcated protruding portion 23 in the widthwise center that protrudes in two toward the bottom side 11b of the bag body, and the curved edge 23a of the bifurcated protruding portion 23 on the bottom side 11b of the bag body forms a cut line C1 that separates the fixing portion 21 and the gripping portion 30 (Figure 2A).

[0031] (Details of the gripping part) The gripping part 30 has a central protrusion 31 that protrudes opposite the bifurcated recess 24 at the widthwise center of the bifurcated protrusion 23 of the fixing part 21 (FIG. 2A). In other words, the upper edge of the widthwise center of the gripping part 30 is closer to the bottom edge 11b of the bag body than the fixing part 21, and the gripping part 30 has, at the center of the upper edge of the widthwise center, the central protrusion 31 that protrudes toward the upper edge 11a of the bag body, with recesses 33 on both sides.

[0032] The grip portion 30 has a fold line L1 extending from the bottom end of the grip portion 30 along the center line L0 of its width to the center of the grip portion 30, where it branches into a V-shaped fold line L2. A cut line C2 is formed between the top ends of the V-shaped fold line L2, connecting the top ends. The V-shaped fold line L2 increases stability when the recess 33 of the grip portion 30 engages with the opening edge of the cup 100, as shown in FIG. 5D.

[0033] The bifurcated recess 24 at the widthwise center of the bifurcated protrusion 23 of the fixing part 21 faces the central protrusion 31 of the grip part 30. A cut line C3, which bisects the width of the central protrusion 31, extends downward from the upper end of the central protrusion 31 and reaches the aforementioned cut line C2 ( FIG. 2A ). This cut line C3 is formed on the center line L0 of the width of the grip part 30. When the grip part 30 is lifted from the bag body, the tip ends 32a, 32b of the central protrusion 31 are separated by the cut lines C2, C3, as shown in FIG. 5A . When the grip part 30 is further lifted to hang the extraction bag 1A on the cup 100 as shown in FIG. 5D , the extraction bag 1A is hung with the tip ends 32a, 32b of the central protrusion 31 separated, which also improves the stability of the hanging state.

[0034] (notch) A pair of notches 40A, 40B are formed on both side edges of the grip portion 30 ( FIG. 2A ). As shown in FIG. 3 , these notches 40A, 40B are designed to easily engage with each other by lifting the free end of the grip portion 30 from the bag body 11, folding the grip portion 30 in half along the fold line L1, and twisting the grip portion 30 in the direction of arrow A or B (counterclockwise or clockwise around the fold line L1 as the twist axis). In other words, the notches 40A, 40B engage regardless of whether the grip portion 30 is twisted left or right. Therefore, the notches 40A, 40B are asymmetric with respect to the fold line L1. Since the notches 40A, 40B engage regardless of whether the grip portion 30 is twisted left or right, regardless of the user's personality, habits, or mood, such as whether they tend to twist left or right, this notch 40A, 40B can be considered a universal design.

[0035] 2A, each of the notches 40A and 40B is formed by a straight portion 41A or 41B and an arc-shaped curved portion 42A or 42B, and the width W2 of the notch, which is the sum of the straight and curved portions, in the width direction of the bag body is preferably 40% to 60% of the width W1 of the gripping portion 30. The positions of the notches 40A and 40B are preferably such that the distance D2 between the lower end of the V-shaped fold line L2 and the notches 40A or 40B in the longitudinal direction of the gripping portion 30 is 20% to 80% of the distance D1 between the lower end of the V-shaped fold line L2 (the bent end of the V) and the leading edge of the gripping portion 30. Furthermore, the angle α formed by the straight portion 41A or 41B of the notches 40A or 40B and the center line L0 of the width of the gripping portion is preferably 40° to 140°.

[0036] The extension lines of the straight line portions 41A and 41B of both notches 40A and 40B are symmetrical with respect to the folding line L1. Furthermore, in this embodiment, from a design point of view, the extension lines of the straight line portions 41A and 41B are formed to pass through the center P of the arc that forms the lower side of the grip portion 30.

[0037] Of the two notches, one notch 40A has a straight portion 41A formed closer to the fold line L1 and an arc-shaped curved portion 42A formed from near the side edge of the gripping portion 30, while the other notch 40B has an arc-shaped curved portion 42B formed closer to the fold line L1 and a long straight portion 41B formed from the side edge of the gripping portion 30, making both notches 40A and 40B asymmetrical with respect to the fold line L1.

[0038] 3, when grip portion 30 folded along fold line L1 is twisted in direction A, curved portion 42A of notch 40A is engaged with straight portion 41B of notch 40B, as shown in FIG. 4, and when grip portion 30 is twisted in direction B, curved portion 42B of notch 40B is engaged with straight portion 41A of notch 40A (not shown). Notches 40A and 40B are formed near the edge on the free end side of grip portion 30 folded in half, i.e., slightly closer to fixed portion 21 than the position where that edge would be pinched with the fingers. Therefore, notches 40A and 40B can be easily engaged by folding grip portion 30 in half along fold line L1, pinching it with the fingers, and twisting it.

[0039] (How to use) The extraction bag 1A is preferably packaged and distributed in a manner in which the thin plate-like member 20 is flattened on the bag body 11 as shown in FIG. 2A.

[0040] To extract an extracting material from the flattened extraction bag 1A, first, as shown in FIG. 3, grasp the free end of the grip 30 to lift the grip 30 away from the bag body 11, fold the grip 30 in half along the fold line L1, and twist the grip 30. This twisting motion alone easily engages the notches 40A and 40B. For example, when the grip 30 is twisted in the direction A in FIG. 3, the notches 40A and 40B engage as shown in FIG. 4.

[0041] When the notches 40A and 40B are engaged, the longitudinal direction of the grip portion 30 (i.e., the direction of the folding line L1) becomes approximately perpendicular to the vertical direction (the direction of the center of gravity) Lz of the bag body 11. In this state, as shown in FIG. 5A , the central protrusion 31 of the grip portion 30 is separated into two at the cut line C3, and the separated tip ends 32a and 32b abut against the bag body 11, making it difficult for the bag body 11 to swing relative to the grip portion 30. Therefore, when the free end of the grip portion 30 is pinched so that the longitudinal direction of the grip portion 30 is horizontal, the vertical direction of the bag body 11 becomes stationary in the vertical direction. This allows the bag body 11 to be smoothly inserted into the cup 100. Furthermore, in this state, the upper end 11u of the bag body 11 is held down by the fixing portion 21, expanding the head space of the bag body 11 and increasing the volume of the bag body 11. 5B, the extraction bag 1A is placed in a cup 100, and hot water is poured into the cup 100 to immerse the bag body 11 in the hot water B, thereby promoting the extraction of the extraction material. If necessary, the gripping portion 30 can be moved up and down to further promote the extraction.

[0042] The extraction material can be extracted by lifting the handle 30 far from the bag body 11 so that the longitudinal direction of the handle 30 is approximately parallel to the vertical direction of the bag body 11, immersing the bag body 11 in hot water B in the cup 100, or by moving the bag body 11 up and down relative to the hot water B, as shown in Fig. 5C. Alternatively, as shown in Fig. 5D, the extraction bag 1A can be attached to the cup 100 so that the recess 33 of the handle 30 rests on the edge of the opening of the cup 100, and then releasing the handle 30 and leaving it as it is. In the extraction bag 1A of this embodiment, the central protrusion 31 is divided into two by the cut line C3 and also has a cut line C2. Therefore, when the handle 30 is raised and the extraction bag 1A is attached to the cup 100, an appropriate gap is created between the pair of recesses 33 adjacent to the tips 32a and 32b of the central protrusion, which stabilizes the attachment of the extraction bag 1A to the cup 100. In this state, the fixing portion 21 is bent along the vertical folding line L3 to conform to the inner surface of the opening edge of the cup 100, and this shape of the fixing portion 21 also stabilizes the hooked state of the extraction bag 1A.

[0043] In the present invention, the central protrusion 31 and the recess 33 of the grip portion 30 may be omitted. The extraction bag 1B shown in the development view of Fig. 6 is the same as the extraction bag 1A shown in the development view of Fig. 1 except that the central protrusion 31 and recess 33 of the grip portion 30 are omitted and the cut line C1 is made substantially flat, and the other configuration is the same as that of the extraction bag 1A shown in Fig. 1. Therefore, a pair of notches 40A and 40B are formed in the grip portion 30.

[0044] In this extraction bag 1B, when the grip portion 30 is folded in half along the fold line L1 and the free end of the grip portion 30 is lifted up from the bag body 11, there is no protruding portion on the grip portion 30 that will abut against the bag body 11, so the lifting can be done smoothly from the start of lifting until the longitudinal direction of the grip portion 30 becomes approximately parallel to the up-down direction Lz of the bag body 11 as shown in Figure 7.

[0045] (Manufacturing method) In order to manufacture the extraction bag 1A of this embodiment using a bag-making, filling and packaging machine, it is preferable to prepare, for example, a roll of an extraction bag-making sheet 50 shown in FIG.

[0046] The extraction bag manufacturing sheet 50 is formed by continuously arranging thin plate-like members 20, each for one extraction bag, at predetermined intervals on a water-permeable filterable sheet 10 that forms the bag body. In the figure, the area between the two-dot chain lines corresponds to the area for one extraction bag 1A.

[0047] The extraction bag manufacturing sheet 50 is placed in a bag making, filling and packaging machine, and the two sides of the extraction bag manufacturing sheet 50 are sealed (vertical sealing) in the usual manner to form the extraction bag manufacturing sheet 50 into a cylindrical shape as shown in Figure 9.As shown in Figure 10, the extraction bag 1A can be easily manufactured by alternately filling the cylindrically sealed extraction bag manufacturing sheet 50 with extraction material A and sealing it horizontally (horizontal sealing).

[0048] (Notch deformation) The extraction bag of the present invention can be modified in various ways. For example, the pair of notches provided in the gripping portion is not limited to those formed by straight portions 41A, 41B and arc-shaped curved portions 42A, 42B as shown in Fig. 2A, but may be formed by S-shaped curved portions 43A, 43B and straight portions 41A, 41B as in the extraction bag 1C shown in Fig. 11. This extraction bag 1C has the same configuration as the extraction bag 1A shown in Fig. 2A except for the notches.

[0049] In the extraction bag 1C shown in Figure 11, the peaks and valleys of the S-shaped curved portion 43A of the notch 40A are formed on both sides of the extension line of the straight portion 41A. The other notch 40B is similar, but the arrangement order of the peaks and valleys is reversed in both S-shaped curved portions 43A, 43B when viewed from the edge of the gripping portion 30. The straight portions 41B, 41B of both notches 40A, 40B are formed symmetrically with respect to the folding line L1.

[0050] When the grip portion 30 is folded in half along the folding line L1, the peak of one S-shaped curved portion 43A overlaps the valley of the other S-shaped curved portion 43B, and the valley of one S-shaped curved portion 43A overlaps the peak of the other S-shaped curved portion 43B. Therefore, whether the folded grip portion is twisted to the left or right about the folding line L1 (i.e., whether it is twisted clockwise or counterclockwise with respect to the longitudinal direction of the grip portion 30), the pair of notches 40A and 40B can be engaged.

[0051] The S-shaped curved portions 43A and 43B shown in FIG. 11 may be rectangular wave-shaped having peaks and valleys.

[0052] 12, one of a pair of notches 40A, 40B may be formed from a rectangular wave-shaped curved portion 44A and a straight portion 41A, and the other may be formed from only a straight portion 41B. These straight portions 41A, 41B are formed at positions that overlap when the grip portion 30 is folded in half along the fold line L1.

[0053] 13, the linear portions 41A and 41B of the notches may be provided perpendicular to the folding line L1 of the gripping portion 30 when folded in half. In order to ensure the length of the overlapping portion of the pair of opposing notches, it is preferable that the linear portions 41A and 41B of the notches be oblique to the folding line L1 of the gripping portion 30 when folded in half.

[0054] As in the extraction bag 1F shown in FIG. 14, each of the pair of notches 40A, 40B may be V-shaped.

[0055] In the extraction bag described above, the notches engage whether the folded handle 30 is twisted counterclockwise or clockwise, but if the direction in which the handle is twisted to engage the pair of notches 40A, 40B is either counterclockwise or clockwise, the pair of notches 40A, 40B may each be an I-notch that is inclined with respect to the fold line L1, as in the extraction bag 1G shown in Figure 15.

[0056] (Deformation of the gripping part) The extraction bag of the present invention can have a gripping portion that can be adapted in various ways. For example, the extraction bag 1H shown in Figure 16 is different from the extraction bag 1A shown in Figure 2A in that the cut line C2 connecting the upper ends of the V-shaped fold lines L2 is omitted, and a cut line C3' is formed within the central protrusion 31 of the gripping portion 30 so that the cut line C3' does not reach the tip 32 of the central protrusion 31.

[0057] 17A , when the grip portion 30 of the extraction bag 1H is folded in half along the folding line L1 and the notches 40A and 40B are engaged, the longitudinal direction of the grip portion 30 becomes approximately perpendicular to the up-down direction of the bag body 11, and the tip portion 32 of the central protrusion 31 abuts against the bag body 11, making it difficult for the bag body 11 to swing relative to the grip portion 30. Therefore, the bag body 11 can be smoothly placed in the cup 100.

[0058] When releasing the gripping portion 30 during extraction, as shown in Figure 17B, the tip 32 of the central protrusion 31 of the gripping portion 30 can be abutted against the outer surface of the opening edge of the cup 100, and the extraction bag 1H can be locked to the cup 100 while maintaining the longitudinal direction of the gripping portion 30 approximately horizontal.

[0059] 17C, the gripping portion 30 may be raised significantly from the bag body 11 so that the longitudinal direction of the gripping portion 30 is approximately parallel to the up-down direction of the bag body 11, and the extraction bag 1H may be engaged with the cup 100 so that the recess 33 of the gripping portion 30 rests on the opening edge of the cup 100. In this state, the fixing portion 21 is bent along the vertical fold line L3 and conforms to the inner surface of the opening edge of the cup 100, improving the stability of the engaged state. Furthermore, when the gripping portion 30 is raised significantly, the cut line C3' opens slightly, causing the central protrusion 31 to bend, thereby stabilizing the engaged state.

[0060] The extraction bag 1I of the embodiment having the unfolded view of Figure 18 is different from the extraction bag 1H described above in that the cut line C3' in the central protrusion 31 of the gripping portion 30 is omitted and the tip 32 of the central protrusion 31 is connected to the recess 24 of the bifurcated protrusion 23 of the fixing portion 21.

[0061] This extraction bag 1I can also be used for extraction by folding the handle 30 in half and engaging the notches 40A and 40B to lift the free end of the handle 30 from the bag body 11 and placing it in a cup 100 as shown in Fig. 19. If the handle 30 is further lifted so that its longitudinal direction is approximately perpendicular to the center of gravity of the bag body 11, the volume of the bag body 11 will reliably expand, facilitating extraction.

[0062] On the other hand, because the tip 32 of the central protrusion 31 of the gripping part 30 and the recess 24 of the bifurcated protrusion 23 of the fixing part 21 are continuous, even if the gripping part 30 is raised so that the longitudinal direction of the gripping part 30 is approximately parallel to the center of gravity of the bag body 11, the recess 33 of the gripping part 30 cannot be engaged with the opening edge of the cup 100. To enable such engagement, it is preferable that the tip 32 of the central protrusion 31 and the recess 24 of the bifurcated protrusion 23 of the fixing part 21 are separated, as in the above-mentioned extraction bag 1H.

[0063] The extraction bag 1J of the embodiment having the unfolded view of Figure 20 is different from the extraction bag 1H described above in that the cut line C3' in the central protrusion 31 of the gripping portion 30 is omitted and the degree of protrusion of the central protrusion 31 into the bifurcated protrusion 23 of the fixing portion 21 is reduced.

[0064] This extraction bag 1J can also be lifted up by folding the gripping portion 30 in half and engaging the notches 40A and 40B to lift up the free end of the gripping portion 30 from the bag body 11. However, as shown in FIG. 21A, even if the gripping portion 30 is lifted up until its longitudinal direction is approximately perpendicular to the vertical direction of the bag body 11, the tip of the central protrusion 31 of the gripping portion 30 does not abut against the surface of the bag body 11, and when lifted up, the angle that the longitudinal direction of the gripping portion 30 makes with respect to the vertical direction of the bag body 11 can be made arbitrarily large.

[0065] When releasing the gripping portion 30 during extraction, as shown in Figure 21B, the tip 32 of the central protrusion 31 of the gripping portion 30 can be abutted against the outer surface of the opening edge of the cup 100, and the longitudinal direction of the gripping portion 30 can be made approximately horizontal to lock the extraction bag 1J into the cup 100.

[0066] As shown in Figure 21C, the gripping portion 30 may be raised so that the longitudinal direction of the gripping portion 30 is approximately parallel to the vertical direction of the bag body 11, and the extraction bag 1J may be engaged with the cup 100 so that the recesses 33 on both sides of the central protrusion 31 of the gripping portion 30 rest on the opening edge of the cup 100.

[0067] The modifications of the above-described variations of the present invention can be combined as appropriate. [Explanation of symbols]

[0068] 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J Extraction Bags 10. Water-permeable filter sheet 11 Bag body 11a Top 11b Bottom 20 Thin plate-like member 21 Fixed part 21a Upper edges of both sides of the fixed part 22 Inverted trapezoidal notch 22a Inverted trapezoid bottom 23 Bifurcated protrusion 23a Bent edge (notched line) 24 Forked recess 25 Reinforcement 30 Gripping part 31 Central protrusion 32, 32a, 32b Tip of central protrusion 33 Recess 40A, 40B notch 41A, 41B Straight section 42A, 42B Arc-shaped curved section 43A, 43B S-shaped curved section 44A Square Wave Type Curved Section 50 Extraction bag manufacturing sheets 100 cups A Extraction material B hot water C1, C2, C3 cutting line L0 Center line of grip width L1 Two-fold fold line L2 V-shaped fold line L3 Vertical fold line L4 horizontal fold line Lz Vertical direction of the bag body W1 Width of gripping part W2 Width of the notch in the width direction of the bag body

Claims

1. An extraction bag having a bag body formed from a water-permeable filter sheet, a thin plate-like member provided on the outer surface of the bag body, and an extraction material filled in the bag body, The bag body has two opposing surfaces, the thin plate-like member has a gripping portion provided on one of the two surfaces and a fixing portion fixed to the bag body adjacent to the gripping portion on the upper side of the bag body, The gripping portion has an upper end fixed to the bag body and a lower end that can be lifted up from the bag body, A folding line is formed at least in the lower part of the gripping portion, dividing the width of the gripping portion into two halves, The extraction bag has a pair of notches formed on both side edges of the grip portion that engage when the grip portion is folded in half and twisted.

2. 2. The extraction bag according to claim 1, wherein a pair of notches are formed asymmetrically with respect to the folding line so that the folded handle can be engaged when twisted to the left or right.

3. 3. The extraction bag according to claim 2, wherein each of the pair of notches has a curved portion and a straight portion.

4. 4. The extraction bag according to claim 3, wherein the curved portion is arc-shaped.

5. 4. The extraction bag according to claim 3, wherein the curved portion is S-shaped.

6. 3. The extraction bag according to claim 1, wherein an inverted trapezoidal notch is formed in the center of the upper edge of the fixing portion, and the fixing portion has a pair of vertical fold lines extending from both ends of the lower base of the inverted trapezoidal notch toward the bottom edge of the bag body.

7. 3. The extraction bag according to claim 1, wherein the thin plate member has reinforcing portions extending from both the left and right sides of the fixing portion to the bottom side of the bag body via horizontal fold lines.

8. 3. The extraction bag according to claim 1, wherein the upper edge of the widthwise center of the gripping portion is closer to the bottom edge of the bag body than the fixing portion, the upper edge has a central protrusion at the widthwise center of the gripping portion that protrudes toward the upper edge of the bag body, and has recesses on both sides thereof, and a cut line is formed between the central protrusion and recess and the fixing portion.

9. 9. The extraction bag according to claim 8, wherein a cut line is formed in the width of the central protrusion of the grip part, dividing the width into two.

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