Drip bag

Abstract

To make it easy to open a bag body of a drip bag and reduce design restrictions on a hanging member that can enjoy the ease of opening the bag body.SOLUTION: A drip bag 1A has: a bag body 11 formed of a water permeable filtering sheet 10; a hanging member 20 formed of a thin plate material and provided on an outer surface of the bag body; and an extract material M filled into the bag body 11. The bag body 11 has a surface 11x and a back surface 11y which share an upper side 11a of the bag body, and has an easy tear line 12 along the upper side 11a of the bag body 11 at least on one of the surface 11x and the back surface 11y. The ease of tearing the surface 11x and the back surface 11y differ according to the easy tear line 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a drip bag that can easily obtain extracts such as coffee, black tea, green tea, and Chinese herbal medicine in a drip form by being hung on a container such as a cup.

Background Art

[0002] For the purpose of easily extracting one cup of coffee, disposable drip bags provided with a bag body filled with coffee powder and a hanging member that allows the bag body to be hung on a cup are available on the market in various product forms.

[0003] For example, there is a drip bag provided with a bag body filled with coffee powder and a hanging member attached to the bag body, and a perforation is formed along the upper side of the bag body. After opening the bag body by breaking the perforation, a specific fold line is formed in the hanging member so that the bag body can be opened with one hand. According to this drip bag, it is necessary to use both hands to open the bag body with the perforation and remove the upper end portion of the bag body. However, to widely open the bag body, it is only necessary to hold both sides of the drip bag with one hand and apply force to crush both sides, and it is also possible to hang the drip bag on a cup following the opening operation.

[0004] In addition, a drip bag has been proposed in which a weak seal portion is provided at the entire width of the upper side of the bag body and a strong seal portion is provided at the entire width of the lower side, so that a series of operations including opening, opening, and hanging the bag body of the drip bag on a cup can be performed with one hand. This drip bag is industrially manufactured using a filling and packaging machine equipped with a specific ultrasonic welding and cutting device that simultaneously forms the weak seal portion on the upper side and the strong seal portion on the lower side of the bag body (Patent Document 2). However, it is difficult to finely adjust the seal strength of the weak seal portion with an ultrasonic welding and cutting device so that the weak seal portion does not accidentally open and can be easily opened when intentionally opening the weak seal portion.

[0005] On the one hand, when opening the bag body, when pulling the front and back of the bag body in opposite directions with a latching member, as a drip bag that significantly reduces the force required for opening and eliminates the scattering of the contents during opening, a fold line extending downward from the upper end of the latching member is provided at the central portion in the width direction of the latching member, and the fixed end of the latching member for causing the latching is provided at the central portion in the width direction of the latching member (Patent Document 3). According to this drip bag, opening is facilitated, but there are many design constraints on the latching member.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] In view of the above - mentioned prior art, the present invention facilitates the opening of the bag body, for example, so that the bag body can be opened without scattering the contents by simply pulling the front and back surfaces of the bag body of the drip bag in opposite directions, and reduces the design constraints on the latching member that can enjoy this ease of opening the bag body. Also, the manufacturing of the drip bag should be such that the use of existing general - purpose filling and packaging machines or ultrasonic welding and cutting devices is sufficient.

Means for Solving the Problems

[0008] The inventor has found that when the bag body of the drip bag has a front surface and a back surface sharing the upper side of the bag body, and a tear - prone line along the upper side is formed on only one of the front surface and the back surface, when the bag body is torn with the front surface and the back surface being pulled in opposite directions, the tearing force of the bag body concentrates on the tear - prone line of the surface or the back surface that is easier to tear, and the bag body can be easily torn, thus completing the present invention.

[0009] That is, the present invention is a drip bag having a bag body formed of a water - permeable filtering sheet, a latching member formed of a thin - plate - like material and provided on the outer surface of the bag body, and an extraction material filled in the bag body, The bag body has a front surface and a back surface sharing the upper side of the bag body, and at least one of the front surface and the back surface has a tear - prone line along the upper side of the bag body, and the tear - prone line makes the ease of tearing of the front surface and the back surface different, thereby providing a drip bag.

Advantages of the Invention

[0010] According to the present invention, at least one of the front surface and the back surface of the bag body has a tear - prone line, and the upper part of the front surface and the upper part of the back surface have different ease of tearing due to the tear - prone line. So, when the front surface and the back surface of the bag body are pulled in opposite directions to tear the upper part of the bag body, the tensile force concentrates on the tear - prone line of the surface that is easier to tear, and thus the tear - prone line can be easily torn.

[0011] This mechanism of tearing action can be applied to various forms of drip bags, and existing filling and packaging machines and ultrasonic welding and cutting devices used in the manufacture of drip bags can also be used.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4A

Figure 4B

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals represent the same or equivalent components.

[0014] (Overview of Drip Bag) FIG. 2 is a plan view of the drip bag 1A in an unopened state according to an embodiment of the present invention, and FIG. 1 is an exploded view of this drip bag 1A. Further, FIG. 3 is a perspective view of a state where the opened drip bag 1A is hooked on the cup 100. In FIG. 2, the portion with fine diagonal hatching represents the sticking area between the bag body and the hooking member, and the portion with thick diagonal hatching represents the sticking area between the front surface 11x and the back surface 11y of the bag body. The fine diagonal hatching and the thick diagonal hatching in the subsequent figures have the same meaning. Note that the sticking area is not limited to the illustrated form. Further, due to the opacity of the thin plate-like material, the sticking area is usually not visually recognizable on the appearance.

[0015] This drip bag 1A has a bag body 11 formed of a water-permeable filter sheet 10, a hooking member 20 provided on the outer surface of the bag body 11 so that the drip bag 1A can be hooked on the cup 100, and an extraction material filled in the bag body 11. The hooking member 20 is formed of a thin plate-like material. Further, the hooking member on the front surface 11x of the bag body and the hooking member 20 on the back surface 11y are continuous at one side 11b1 of the bag body and are formed symmetrically with respect to the side 11b1.

[0016] The bag body 11 has a front surface 11x and a back surface 11y that share the upper side 11a of the bag body 11. In the present invention, an easily tearable line 12 along the upper side 11a of the bag body 11 is formed on at least one of the front surface 11x and the back surface 11y. In the drip bag 1A of this embodiment, the easily tearable line 12 along the upper side 11a of the bag body 11 is formed only at the upper part of the front surface 11x.

[0017] As the easily tearable line 12, a sewing line or the like can be formed. As the sewing line, a micro sewing line can be provided from the viewpoint of facilitating opening. Further, in this embodiment, the ratio Lc / Lu of the cut length Lc to the uncut length Lu of the sewing line is constant over the entire width of the front surface 11x, but the present invention is not limited to this. For example, as will be described later, this ratio Lc / Lu can be made larger at the center in the width direction of the bag body than on both sides thereof.

[0018] When sewing lines are provided on both the front surface 11x and the back surface 11y of the bag body 11, the ease of tearing of the sewing lines on the front surface 11x and the ease of tearing of the sewing lines on the back surface 11y may be made different by making the ratio Lc / Lu of the sewing lines on the front surface 11x different from the ratio Lc / Lu of the sewing lines on the back surface 11y.

[0019] The distance d1 between the upper side 11a of the bag body 11 and the easily tearable line 12 is preferably 1.0 to 4.5 mm, more preferably 1.5 to 3.5 mm. If this distance is too small, when the upper side 11a of the bag body 11 is the sealed side where the front surface 11x and the back surface 11y are adhered, the sealing area and the easily tearable line 12 may overlap, and the function of the easily tearable line 12 may be impaired. On the other hand, for example, when the easily tearable line on the front surface 11x tears and the bag body 11 opens, the cut portion of the front surface 11x from the easily tearable line on the front surface 11x to the upper side 11a will remain on the back surface 11y side. Therefore, if the distance d1 between the upper side 11a of the bag body 11 and the easily tearable line 12 is too large, the cut portion of the front surface 11x remaining on the back surface 11y will increase, so the upper end portion of the back surface 11y will droop into the opening of the bag body 11, and the appearance will be impaired, which is not preferable. Also, if this distance d1 becomes even larger, the tensile force required for the tearing of the easily tearable line will increase, which is not preferable.

[0020] The distance d2 between the adhering area R between the latching member 20 and the bag body 11 at the upper end portion of the latching member 20 and the easily tearable line 12 is preferably larger than the distance d1 between the upper side 11a of the bag body 11 and the easily tearable line 12, and the sum of the distance d1 and the distance d2 is preferably 4 to 8 mm. Also, the distance d2 is preferably 1.5 to 5.0 mm. If the distance d2 is too small, there is a risk that the adhering area R between the latching member 20 and the bag body 11 at the upper end portion of the latching member 20 will overlap the easily tearable line 12 of the bag body 11 and the function of the easily tearable line 12 will be impaired. On the contrary, if it is too large, the tensile force required for the tearing of the easily tearable line 12 will increase, which is not preferable. Note that as long as the adhering area R between the latching member 20 and the bag body 11 does not overlap the easily tearable line 12, the easily tearable line 12 and the latching member 20 may overlap.

[0021] (Bag body) The bag body 11 is formed of a water-permeable filtration sheet. The bag body 11 is filled with extraction materials such as coffee powder, tea leaves, or Chinese herbal medicines.

[0022] As the water-permeable filtration sheet 10 forming the bag body 11, various sheets that can allow the extraction materials such as a predetermined amount of coffee powder, tea leaves, and Chinese herbal medicines to be filled and allow the extraction materials to leach out when hot water is poured can be used. Generally, as the leaching sheet, for example, woven or non-woven fabrics made of synthetic fibers such as polyester, nylon, polyethylene, polypropylene, and vinylon, semi-synthetic fibers such as rayon, natural fibers such as kozo and mitsumata, alone or as composite fibers, mixed papers made of manila hemp, wood pulp, polypropylene fibers, etc., papers such as tea bag base paper are known, and these can also be used in the present invention. However, from the viewpoint of the disposability after the use of the drip bag, it is preferable that the water-permeable filtration sheet material contains biodegradable fibers. Examples of biodegradable fibers include polylactic acid, polybutylene succinate, and polyethylene succinate. Further, in order to impart an appropriate steaming effect to the coffee powder during dripping, when manufacturing the water-permeable filtration sheet from these fiber materials, the layer that will be in direct contact with the coffee powder is made "loose" by adjusting the porosity of the fiber layer, and the layer that will not be in direct contact is made "dense" to form a dense and loose multi-layer structure. Also, it is preferable to increase the content of hydrophobic fibers in the layer that will be in direct contact with the coffee powder and decrease the content of hydrophobic fibers in the layer that will not be in direct contact with the coffee powder (Japanese Patent No. 3674486).

[0023] The bag body 11 of this embodiment is a three-side sealed bag that is rectangular in plan view. One side 11b1 serves as the fold of the water-permeable filtration sheet 10, and the other side 11b2, the upper side 11a, and the bottom side 11c serve as the seal sides of the front surface 11x and the back surface 11y. In the present invention, the upper side 11a of the bag body 11 may serve as the fold of the water-permeable filtration sheet. The seal width at the seal side can be set as appropriate. For example, in the case of ultrasonic sealing, it can be set to 0.3 to 0.6 mm.

[0024] In addition, the planar dimensions of the bag body 11 can be appropriately set according to the size of the cup or container for hanging the drip bag. For example, it may be set to a size that can be used with a commercially available coffee cup. Machi may be provided at the bottom or side of the bag body 11 as necessary.

[0025] (Hanging member) The hanging member 20 is formed of a thin plate-like material such as cardboard or a plastic sheet. As the thin plate-like material, from the viewpoint of disposability after use of the drip bag 1A, it is preferable to use a biodegradable material such as polylactic acid, polybutylene succinate, or polyethylene succinate.

[0026] In the present invention, the hanging member 20 can take various forms. In the drip bag 1A of this embodiment, as shown in the developed view of FIG. 1, the hanging members 20 provided on the front surface 11x and the back surface 11y of the bag body 11 are formed by punching a single rectangular thin plate-like material, and the hanging member on the front surface 11x and the hanging member on the back surface 11y are continuous.

[0027] On each of the front surface 11x and the back surface 11y of the bag body 11, the hanging member 20 has a central fixing portion 21 fixed to the bag body 11 at the central portion in the width direction of the bag body, and a hanging portion 23 that can be raised from the bag body 11 with the left and right sides of the central fixing portion 21 as the raising axes 22.

[0028] More specifically, the central fixing portion 21 is formed on the center line A1 of the width of the bag body 11. In the central fixing portion 21, it is sufficient that the left and right sides thereof are fixed to the front surface of the bag body 11 as the raising axes 22 of the hanging portion 23. In this embodiment, an adhering region between the hanging member 20 and the bag body 11 is provided in the central fixing portion 21. From the viewpoint of improving the stability of the hanging portion 23 when the left and right hanging portions 23 of the central fixing portion 21 are pulled in opposite directions on the front surface side and the back surface side of the bag body 11, it is preferable that the upper half or more of the region in the central fixing portion 21 be the adhering region between the hanging member 20 and the bag body 11. On the other hand, it is not always necessary to provide the adhering region between the hanging member 20 and the bag body 11 in the central fixing portion 21 in order to fix the raising axis 22 to the front surface of the bag body 11.

[0029] The left and right latching portions 23 of the central fixing portion 21 are formed symmetrically with respect to the center line A1. As shown in FIG. 3, a recess 24 is formed on the lower side of the latching portion 23 for stably placing the latching portion 23 on the opening wall of the cup 100.

[0030] In the latching member 20, the outer sides of the left and right latching portions 23 serve as reinforcing portions 25 for maintaining the opening shape of the bag body 11 in a quadrangular prism shape. On the surface 11x of the bag body 11, the upper side of the reinforcing portion 25 forms the upper side 20a of the latching member 20, and a perforation 12 is formed as an easy-tearing line 12 between the upper side of the reinforcing portion 25 and the upper side 11a of the bag body 11.

[0031] As shown in FIG. 2, the peripheral edges of the reinforcing portion 25 are adhered to the bag body 11 on both the surface 11x and the back surface 11y of the bag body 11.

[0032] Also, on the latching member 20 on the surface 11x and the back surface 11y, a broken line L1 is formed on the center line A1, extending downward from the upper side 20a of the latching member 20 (i.e., toward the bottom side of the bag body), and a broken line L2 is formed from the lower end of this broken line L1 to the upper end points of the cuts that define the left and right latching portions 23 of the central fixing portion 21. The broken lines L1 and L2 are formed by cuts, perforations, half-cuts, embossing, etc.

[0033] Due to this broken line L1, when the surface 11x and the back surface 11y of the bag body 11 are pulled in opposite directions when opening the bag body 11, the upper side 20a of the latching member 20 is easily bent, and the tensile force is concentrated on the easy-tearing line 12 on the extension line of the broken line L1. Also, due to the broken line L2, this concentration of the tensile force becomes even more likely to occur. Therefore, in addition to the easy-tearing line 12 being formed only on the surface 11x of the bag body 11, the broken lines L1 and L2 also make the easy-tearing line 12 more likely to crack.

[0034] On the center line A1, a broken line L1' extending upward from the lower side of the latching member 20 is formed in the same manner as the broken line L1. From the upper end of the broken line L1', a broken line L2' is formed to the lower end points of the cuts that define the left and right latching portions 23 of the central fixing portion 21. As a result, the opening shape of the bag body 11 becomes stable in a prismatic shape as shown in FIG. 3.

[0035] (Usage method) As a usage method of this drip bag 1A, first, on both the front surface 11x side and the back surface 11y side of the bag body 11, the latching portions 23 on both sides of the central fixing portion are lifted from the bag body 11, grasped, and the latching portion 23 on the front surface 11x side and the latching portion 23 on the back surface 11y side are pulled in opposite directions. Since the tear - prone line 12 is formed only on the front surface 11x of the bag body 11 near the upper side 11a of the bag body 11, the tensile force concentrates on this tear - prone line 12. Therefore, first, the tear - prone line 12 on the approximate center line A1 quickly tears, opening the bag body 11, and this tear spreads throughout the tear - prone line 12, and the bag body 11 easily opens wide.

[0036] Also, since the broken line L1 is formed at the upper end of the latching member 20 on the center line A1, when the latching portion 23 on the front surface 11x side and the latching portion 23 on the back surface 11y side are pulled in opposite directions, the upper end of the latching member 20 easily bends along the broken line L1, and the tensile force concentrates on the tear - prone line 12 on the extension line of the broken line L1. This concentration of the tensile force is also likely to occur due to the broken line L2 connecting the lower end of the broken line L1 and the upper end points of the cuts that define the latching portion 23. Therefore, the tear - prone line 12 tears even more easily, and the bag body 11 opens.

[0037] In this open state, the bag body 11 becomes a quadrangular prism shape. Next, as shown in FIG. 3, the drip bag 1A is placed on the cup 100 with the concave portion 24 of the latching portion 23 aligned with the opening wall of the cup 100. Then, by pouring hot water into the opening 11m of the bag body 11, an extract is obtained in the cup 100. In FIG. 3, the symbol M represents the extraction material.

[0038] (Manufacturing method) In order to manufacture the drip bag 1A of the present embodiment using a filling and packaging machine, it is preferable to prepare a roll of the drip bag manufacturing sheet 15A shown in Fig. 4A.

[0039] The drip bag manufacturing sheet 15A is obtained by continuously arranging latching members 20 for one drip bag at predetermined intervals on the water-permeable filtering sheet 10. In the figure, the area between the two-dot chain lines is the area for one drip bag 1A.

[0040] The drip bag manufacturing sheet 15A is placed in a filling and packaging machine, and the two side edges of the drip bag manufacturing sheet 15A are sealed (longitudinal seal) together by a conventional method to form the drip bag manufacturing sheet 15A into a cylindrical shape. Then, the filling of the extract and the horizontal sealing (transverse seal) are alternately performed to easily manufacture the drip bag 1A.

[0041] In the drip bag manufacturing sheet 15A shown in Fig. 4A, the easy tear line 12 is formed only near one side edge of the drip bag manufacturing sheet 15A. However, the easy tear line 12 may be alternately formed near one side edge and the other side edge as in the drip bag manufacturing sheet 15A' shown in Fig. 4B. This is preferable because it can eliminate the risk that one side edge of the sheet extends when pulling out the drip bag manufacturing sheet from the roll, and the drip bag manufacturing sheet gets entangled or damaged when continuously manufacturing drip bags by placing the drip bag manufacturing sheet in a filling and packaging machine.

[0042] (Modification) The drip bag of the present invention can take various forms. For example, using the drip bag manufacturing sheet 15B shown in Fig. 6, the drip bag 1B in the plan view of the surface 11x side shown in Fig. 5 can be obtained. The rear view of this drip bag 1B is the same as the plan view shown in Fig. 5 except that the easy tear line 12 is not formed.

[0043] The hanging member 20 of the drip bag 1B has a central fixing portion 21 and a hanging portion 23 similar to those of the above-described drip bag 1A, and has a reinforcing portion 25 outside the hanging portion 23. The bag body 11 is also a three-sided sealed bag, which is common to the above-described drip bag 1A in that respect. However, in this drip bag 1B, the upper side 11a of the bag body 11 forms a fold of the water-permeable filter sheet 10. Also, the hanging member 20 on the front surface 11x side of the bag body 11 and the hanging member 20 on the back surface 11y side are not continuous. Thus, the present invention is not limited to the case where the upper side 11a of the bag body is a sealed side.

[0044] In the drip bag 1C shown in FIG. 7, in the drip bag 1A described above, the ratio Lc / Lu of the cut length Lc to the uncut length Lu of the stitches forming the easy tear line 12 is made larger in the central portion 12a in the width direction of the bag body overlapping the center line A1 of the width of the bag body than in the left and right regions 12b thereof. For example, the width W1 of the central portion 12a of the stitches is 4 to 12 mm, the ratio Lc / Lu of the cut length Lc to the uncut length Lu of the stitches in the central portion 12a is 4 to 10, and is 2 to 4 in the left and right regions 12b of the central portion 12a. Thereby, the tensile strength required for the tearing of the easy tear line 12 can be made about 1 / 3 compared to the case where the entire stitches are formed at the same ratio Lc / Lu as in the region 12b.

[0045] In the drip bag 1D shown in FIG. 8, in the drip bag 1A described above, the shape of the adhering region between the hanging member 20 and the bag body 11 is changed at the upper end portion of the hanging member 20. That is, in this drip bag 1D, in the vicinity of the upper side 20a of the hanging member 20, the adhering region R1 between the hanging member 20 and the bag body 11 in the central portion in the width direction of the bag body overlapping the center line A1 protrudes in the direction of the upper side 20a of the hanging member 20 compared to the adhering regions R2 on the left and right thereof. It is preferable that the protrusion of the adhering region R1 in the central portion is performed on both the front surface 11x side and the back surface 11y side of the bag body 11.

[0046] The protruding shape of the sticking area R1 in the central part is preferably such that, for example, the width W2 of the sticking area R1 in the central part is 3 to 8 mm, the distance between the sticking area R1 and the upper side 20a of the latching member 20 is 0 to 3 mm, and the distances between the left and right sticking areas R2 of the sticking area R1 and the upper side 20a of the latching member 20 are 4 to 10 mm. Thereby, when the latching portions 23 on the front surface 11x side and the latching portions 23 on the back surface 11y side of the bag body are pinched and pulled in opposite directions, the force applied to the tear line 12 becomes more concentrated at the central portion in the width direction of the bag body of the tear line 12, and the tensile force required for the tearing of the tear line 12 can be reduced.

[0047] The shape of the latching member to which the present invention can be applied is not limited to the mode of splitting the tear line 12 by pulling the latching portion 23 on the front surface 11x of the bag body 11 and the latching portion 23 on the back surface 11y in opposite directions. Similar to the drip bag described in Patent Document 1, force may be applied such that the distance between the central portion of the latching member on the front surface 11x side and the central portion of the latching member on the back surface 11y side of the bag body increases by gripping both side edges of the bag body and applying force to crush it.

[0048] For example, the drip bag 1E shown in FIG. 10, which has the developed view of FIG. 9, is a drip bag described in Patent Document 1, in which the tear line 12 for opening is formed between the latching member 20 and the upper side of the bag body 11 on the front surface 11x of the bag body, and the tear line 12 for opening is not formed on the back surface 11y of the bag body. In the figure, reference symbol L3 is a U-shaped fold line characteristic of the drip bag described in Patent Document 1, reference symbol L4 is a fold line extending from the bent portion of the U-shaped fold line L3 in the direction of the side edge 11b where the bag body forms a mountain fold, and reference symbol L5 is a fold line extending from the upper side 20a of the latching member 20 in the downward direction. Further, reference symbols 27 and 28 are locking portions formed so as to be able to be raised from the bag body 11 at the lower part of the latching member 20, respectively. On the center line A2 of the width of the latching member 20, a short fold line L1 extending from the upper side 20a of the latching member 20 in the downward direction is formed.

[0049] According to this drip bag 1E, by gripping both sides of the drip bag 1E with one hand and applying a force to crush it, the tear line 12 for opening is torn to open the bag body, and further the bag body 11 is widely opened, and it can be locked to the cup as it is without gripping the drip bag 1E again. Therefore, the operation from opening the drip bag to locking it to the cup becomes extremely simple.

[0050] The drip bag 1F shown in FIG. 11, compared with the drip bag 1E shown in FIG. 10, on both the front surface 11x side and the back surface 11y side of the bag body, the adhesion region between the upper end portion of the latching member 20 and the bag body 11 is projected in the direction of the upper side 20a of the latching member 20 at the central portion in the width direction of the latching member 20. This protruding adhesion region R1 overlaps with the center line A2 of the width of the latching member 20. By forming this adhesion region R1, similar to the drip bag 1D shown in FIG. 8, the tensile force required for the tear of the easy tear line 12 can be reduced when the bag body 11 is opened.

[0051] The drip bag 1G shown in FIG. 12, in the drip bag 1F shown in FIG. 11, on both the front surface 11x side and the back surface side of the bag body, a protruding piece 29 protruding in the direction of the upper side 11a of the bag body is formed at the central portion in the width direction of the upper side 20a of the latching member 20, an adhesion region R1 is formed in a part of the protruding piece 29, and the short broken line L1 extending from the upper side 20a of the latching member 20 downward is omitted. Thereby, the bag body can be opened by pinching the protruding pieces 29 on the front surface 11x side and the back surface side of the bag body and pulling them in opposite directions, and the tensile force required for opening can be reduced by the adhesion region R1.

[0052] The above-described modified forms can be appropriately combined. Further, the present invention can be applied to drip bags having latching members of various shapes.

Example

[0053] Hereinafter, the present invention will be specifically described based on examples.

[0054] Example 1 A drip bag 1A having the developed view shown in FIG. 1 was manufactured. In this case, a meltblown nonwoven fabric laminated on a wet nonwoven fabric was used as the water-permeable filter sheet, and a perforation was formed as the easy cleavage line 12. The distance d1 between the upper side 11a of the bag body and the perforation 12 was set to 2.0 mm. Further, an adhesion region R between the latching member 20 and the bag body 11 was formed along the upper edge of the latching member 20, and the distance d2 between the adhesion region R and the perforation 12 was set to 2.5 mm. The perforation 12 was made constant with a cut length (Lc) of 1.16 mm, an uncut length (Lu) of 0.16 mm, and Lc / Lu = 7.25.

[0055] Opening strength test Using a tensile tester combining an electric measurement stand (MX2-500N-FA-L manufactured by IMADA) and a digital force gauge (ZTA-50N manufactured by IMADA), as shown in FIG. 13, the latching portion 23 on the front surface side and the latching portion 23 on the back surface side of the drip bag were each grasped by the clamp 30 of the tensile tester and pulled in opposite directions. In this case, the pulling speed was fixed at 100 mm / min, the tensile stress was measured, and the stress (opening strength) when the perforation first cracked was obtained (n = 3).

[0056] The general relationship between the pulling distance and the tensile stress in this case is shown in FIG. 14. At the beginning of pulling, the tensile stress increases as the pulling distance increases. However, when the perforation cracks, the tensile stress decreases discontinuously, so the opening strength can be obtained.

[0057] The opening strength of the drip bag of Example 1 obtained in the above opening strength test is shown in Table 1.

[0058] Example 2 A drip bag was manufactured in the same manner as in Example 1 except that the perforation was made constant with a cut length (Lc) of 1.05 mm, an uncut length (Lu) of 0.44 mm, and Lc / Lu = 2.38, and the opening strength was obtained. The results are shown in Table 1.

[0059] Example 3 The sewing line was cut with a cut length (Lc) of 1.16 mm, an uncut length (Lu) of 0.16 mm, and Lc / Lu = 7.25 in the range of 5 mm in length at the center in the width direction of the bag body, and drip bags were manufactured in the same manner as in Example 1 except that both sides thereof had a cut length (Lc) of 1.05 mm, an uncut length (Lu) of 0.44 mm, and Lc / Lu = 2.38, and the opening strength was determined. The results are shown in Table 1.

[0060] Example 4 The drip bag was manufactured in the same manner as in Example 1 except that the seal shape at the upper end of the latching member was made to project up to the upper side of the latching member in the range of 6 mm in length in the width direction of the bag body at the center in the width direction of the bag body, and both sides thereof were made into strip-shaped seals with a distance of 5 mm from the upper side of the latching member, and the opening strength was determined. The results are shown in Table 1.

[0061] Example 5 The drip bag was manufactured in the same manner as in Example 1 except that the sewing line had a constant cut length (Lc) of 1.05 mm, an uncut length (Lu) of 0.44 mm, and Lc / Lu = 2.38 as in Example 2, and the seal shape at the upper end of the latching member was made to project in the same manner as in Example 4, and the opening strength was determined. The results are shown in Table 1.

[0062] Example 6 The drip bag was manufactured in the same manner as in Example 1 except that the distance d1 between the upper side 11a of the bag body and the sewing line 12 was 1.0 mm, and the opening strength was determined. The results are shown in Table 1.

[0063] Example 7 The drip bag was manufactured in the same manner as in Example 1 except that the distance d1 between the upper side 11a of the bag body and the sewing line 12 was 5.0 mm, and the opening strength was determined. The results are shown in Table 1.

[0064] Comparative Example 1 The drip bag was manufactured in the same manner as in Example 1 except that the sewing line 12 was formed on both the front surface 11x and the back surface 11y of the bag body, and the opening strength was determined. The results are shown in Table 1.

[0065]

Table 1

[0066] The drip bag of Comparative Example 1 in which sewing lines are formed on both the front and back surfaces of the bag body has a greater opening strength and a greater variation in opening strength than the drip bag of the Example in which sewing lines are formed only on the front surface of the bag body.

[0067] Also, from the comparison between Example 1 and Example 2 and the comparison between Example 4 and Example 5, it can be seen that increasing the ratio Lc / Lu of the cut length (Lc) to the uncut length (Lu) of the sewing line decreases the opening strength.

[0068] Also, from Example 1 and Example 3, it can be seen that when the ratio Lc / Lu of the cut length (Lc) to the uncut length (Lu) of the sewing line at the central portion in the width direction of the bag body is made larger than that in the regions on both sides thereof, the opening strength decreases more than when this ratio Lc / Lu is made larger over the entire width direction of the bag body. Since increasing this ratio Lc / Lu over the entire width direction of the bag body causes a risk of breakage of the sewing line during the manufacturing process of the drip bag, it can be seen that the sewing line of Example 3, in which the ratio Lc / Lu is large only at the central portion and the opening strength is low, is more advantageous than that of Example 1 in which the ratio Lc / Lu is large over the entire width direction of the bag body.

[0069] From the comparison between Example 1 and Example 4 and the comparison between Example 2 and Example 5, it can be seen that when the seal shape at the upper end portion of the latching member is made to protrude in the upper side direction of the latching member at the central portion in the width direction of the bag body, the opening strength decreases. Also, from Example 6 and Example 7, it can be seen that decreasing the distance between the sewing line and the upper side of the bag body decreases the opening strength, and that if this distance is too large, the upper end portion on the back side of the bag body sags toward the opening side of the bag body, deteriorating the appearance.

Description of Reference Numerals

[0070] 1A, 1B, 1C, 1D, 1E, 1F, 1G Drip bags 10 Water-permeable filtration sheet 11 Bag body 11a Upper side 11b1, 11b2 Side sides 11c bottom side 11m opening 11x surface 11y back side 12 tear line, perforation 12a central part of the perforation where the ratio Lc / Lu of the cut length Lc to the uncut length Lu of the perforation is different 12b regions on the left and right of the central part 12a 15A, 15A’, 15B sheets for manufacturing drip bags 20 latching member 20a upper side 21 central fixing part 22 triggering axis 23 latching part 24 recess 25 reinforcing part 27 locking part 28 locking part 29 protruding piece 30 clamp 100 cup A1 center line of the width of the bag body A2 center line of the width of the latching member d1 distance between the upper side of the bag body and the tear line d2 distance between the sticking area R and the tear line 12 L1, L1’, L2, L2’, L3, L4, L5 fold lines M extraction material R sticking area between the latching member and the bag body at the upper end of the latching member R1 sticking area between the latching member and the bag body protruding in the upper side direction of the latching member R2 sticking areas on the left and right of the sticking area R1 W1 width of the central part of the tear line where the ratio Lc / Lu of the cut length Lc to the uncut length Lu of the perforation is different W2 width of the sticking area R1

Claims

1. A drip bag having a bag body formed of a water-permeable filter sheet, a latching member formed of a thin plate-like material and provided on the outer surface of the bag body, and an extraction material filled in the bag body, wherein the bag body has a front surface and a back surface sharing the upper side of the bag body, one of the front surface and the back surface has a tear line along the upper side of the bag body, and the other does not have a tear line, the latching member is capable of pulling the front surface and the back surface in opposite directions to each other, the tear line is torn by the force applied to the latching member so that the front surface and the back surface are pulled in opposite directions to each other, and the bag body opens, and the portion between the tear line on the one surface and the upper side of the bag body remains on the other surface of the bag body after opening to form an upward opening of the bag body. A drip bag.

2. A drip bag manufacturing sheet in which latching members formed of a thin plate-like material for one drip bag are continuously arranged at predetermined intervals on a long water-permeable filter sheet and wound around a roll, wherein the drip bag has a tear line along the upper side of the drip bag, and the tear lines are alternately arranged near one side and the other side of the drip bag manufacturing sheet.

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