Seal, joint cap and refill bottle

Abstract

To provide a seal for clogging an opening part of a joint cap of a refill bottle of a liquid server, which can prevent liquid leakage even in the case of improper use (in the case where the refill bottle is attached to a water receiving rod of the liquid server without peeling the seal).SOLUTION: A seal of the present invention is used for clogging an opening part of a joint cap of a refill bottle of a liquid server. The refill bottle and the liquid server are connected by inserting a water receiving rod of the liquid server into the opening part. The seal is made up of a laminated body including a base material layer and an adhesive layer. The base material layer of the seal has a breaking auxiliary line with a rotationally symmetrical shape relative to the center of a central part at the center part in plane view. Even if the seal is broken, broken pieces do not separate from an outer circumferential part of the seal by inserting the water receiving rod into the opening part clogged with the seal. An adhesive layer is present even in a range where the breaking auxiliary line is placed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a seal, a joint cap, and a refill bottle. [Background technology]

[0002] Patent Document 1 (JP Patent Publication 2010-254337 A) discloses a lid that can seal the opening of a paper cup (such as a refill container for instant coffee) and can be easily opened by pushing and tearing it. The lid includes a polyethylene sealant layer in the innermost layer, and is sealed to the opening of the paper cup by the sealant layer. The lid is provided with multiple strength weaknesses (perforations or cut lines) that extend radially from the center and whose tips do not reach the periphery of the lid.

[0003] 2 and 3, the opening 20 of the connection part (such as a joint cap 2) of a refill bottle 3 of a liquid server (such as a water server) is generally closed by attaching a sticker 1. Here, unlike Patent Document 1, the sticker 1 has an adhesive layer and is attached to the connection part by the adhesive layer. When refilling the liquid server with liquid, the liquid server's water receiving rod 4 (see also FIG. 10) is inserted into the opening 20 of the joint cap 2 of the refill bottle 3 to communicate with the inside of the liquid server and the refill bottle 3. At this time, the seal 1 affixed to the opening 20 of the joint cap 2 is usually peeled off beforehand. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-254337 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, if a user mistakenly connects the refill bottle 3 to the liquid server without peeling off the seal 1, the seal 1 torn by the receiving rod 4 will be caught between the opening 20 of the joint cap 2 and the receiving rod 4, creating a gap between the opening 20 and the receiving rod 4, which may cause liquid to leak from the gap and spill a large amount of liquid. Also, small pieces that are randomly torn may be supplied with water through the receiving rod 4.

[0006] The object of the present invention is to provide a seal for closing the opening of the joint cap of a refill bottle for a liquid server, which can prevent liquid leakage even in the case of incorrect use (when the refill bottle is attached to the water receiving rod of the liquid server without removing the seal). [Means for solving the problem]

[0007] The seal of the present invention is a seal for closing an opening of a joint cap of a refill bottle for a liquid server. The refill bottle and the liquid server are connected by inserting the water receiving rod of the liquid server into the opening. The seal is composed of a laminate including a base layer and an adhesive layer. The base material layer of the seal has a tear assist line in a central portion including the center thereof in a plan view. Even if the seal is broken by inserting the water receiving rod into the opening blocked by the seal, the broken pieces will not leave the outer periphery of the seal. The adhesive layer is also present in the area where the break assist line is provided. Effect of the Invention

[0008] According to the present invention, it is possible to provide a seal for closing the opening of the joint cap of a refill bottle of a liquid server, which can prevent liquid leakage even in the case of incorrect use (i.e., when the refill bottle is attached to the water receiving rod of the liquid server without removing the seal). [Brief description of the drawings]

[0009] [Figure 1] 2A and 2B are a plan view (upper side) and a cross-sectional view (lower side) showing an example of a seal of an embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing the area around the joint cap and the water receiving rod before connection. [Diagram 3] 1 is a schematic cross-sectional view showing the area around the joint cap and the water receiving rod in a connected state. FIG. [Figure 4] FIG. 13 is a plan view showing a modified example of the seal of the embodiment. [Diagram 5] FIG. 13 is a plan view showing another modified example of the seal of the embodiment. [Figure 6] FIG. 13 is a plan view showing another modified example of the seal of the embodiment. [Figure 7] FIG. 13 is a plan view showing another modified example of the seal of the embodiment. [Figure 8] FIG. 13 is a plan view showing another modified example of the seal of the embodiment. [Figure 9] FIG. 13 is a plan view showing another modified example of the seal of the embodiment. [Figure 10] FIG. 2 is a perspective view showing the water receiving rod of the liquid server. [Figure 11] FIG. 4 is a schematic cross-sectional view showing an inclined portion near an opening of a joint cap. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or common parts are denoted by the same reference numerals.

[0011] <Seal> The seal of this embodiment is a seal for closing the opening of a joint cap of a refill bottle of a liquid server.

[0012] (liquid server) A liquid server has a tank for storing liquid and has a function for supplying the liquid to a user. In addition, the liquid here is not particularly limited as long as it is a substance (fluid substance) having flowability, and also includes sols (colloids with liquid as a dispersion medium). Examples of liquids include drinking water and various beverages. Examples of liquid servers include water servers.

[0013] (Refill bottle) 2 and 3, refill bottle 3 is a bottle (container) that contains liquid to be used to refill liquid server 5. The refill bottle 3 has a joint cap 2 provided at its mouth. The joint cap 2 has an opening 20. When refilling the liquid server 5 with liquid, the refill bottle 3 and the liquid server 5 are connected by inserting the water receiving rod 4 (see also FIG. 10) of the liquid server 5 into the opening 20 of the joint cap 2. That is, the internal cavities of the refill bottle 3 and the liquid server 5 are liquid-communicated via the water receiving hole 41 provided in the water receiving rod 4. Hereinafter, the state in which the refill bottle 3 and the liquid server 5 are connected in this way (the state in FIG. 3) may be referred to as the "connected state." In this way, the joint cap 2 is a member that functions both to close the mouth of the refill bottle 3 to prevent evaporation and leakage of the contents, and to function as a connection part with the liquid server.

[0014] In this embodiment, the joint cap 2 has an inner lid 21. As shown in Fig. 2, before being connected, the refill bottle 3 is sealed by the inner lid 21 so that the contents do not leak. When the receiving rod 4 is inserted into the opening 20 to be connected, for example, as shown in Fig. 3, the inner lid 21 is removed from the opening 20 with the protrusion 21a of the inner lid 21 fitted into the recess 42 of the receiving rod 4. This causes the content of the refill bottle 3 to be refilled into the liquid server 5 through the receiving hole 41 of the receiving rod 4.

[0015] (seal) The opening 20 of the joint cap 2 is closed by sticking a seal 1 (label) to an area including the periphery of the opening 20 of the joint cap 2 until use (before the joint cap 2 is brought into a connected state). Usually, when refill bottle 3 and liquid server 5 are to be connected, sticker 1 attached to opening 20 of joint cap 2 is peeled off beforehand.

[0016] 1, the seal 1 is composed of a laminate including a base layer 1a and an adhesive layer 1b. The seal 1 may further include a cover layer 1c and the like. The seal 1 is attached to a predetermined area including the periphery of the opening 20 of the joint cap 2 by the adhesive layer 1b.

[0017] (Break extension line) The seal of this embodiment is characterized by the provision of a break assist line having a specific shape on a seal that may be broken by piercing it with a rod-shaped member such as the receiving rod 4 of a liquid server 5. Thus, the significance of the present invention is that a break assist line is provided in a seal which is normally used without being broken, taking into consideration the possibility of the seal being broken due to incorrect operation. As a result of the inventors' research, a breaking assistance line 11 is provided in the center of the seal 1 which is broken by the water receiving rod 4, and an adhesive layer is provided at the location of the breaking assistance line 11 (the portion which is broken by the water receiving rod 4), and the seal 1 is configured so that even if it breaks, the broken pieces do not separate from the outer periphery of the seal 1. As a result, the broken part of the seal 1 is attached to the inner wall of the opening 20, which makes it difficult for a gap to form between the opening 20 and the water receiving rod 4 and prevents the broken pieces of the seal 1 from getting mixed into the refill bottle 3 or liquid server 5. It was also found that, particularly when an unevenly torn seal is in a folded-over state and becomes caught between the opening 20 of the joint cap 2 and the water receiving rod 4, a gap is likely to form between the opening 20 and the water receiving rod 4. As a result of careful consideration, it was found that it is preferable to provide the seal with a rupture assist line 11 having a rotationally symmetrical shape, and in this case, the seal 1 becomes more likely to rupture uniformly (it becomes more likely to be divided evenly in the circumferential direction), so that even if the seal 1 is caught between the opening 20 and the water receiving rod 4, a gap is less likely to form between the opening 20 and the water receiving rod 4. The present invention has been made based on these new ideas and findings.

[0018] The tear assist line 11 is a linear portion configured to facilitate tearing of the seal 1 at that portion. The tear assist line 11 may be configured, for example, as a plurality of through holes (including cut lines) such as perforations, or may be configured as a linear portion having a partially thin thickness without through holes such as a half-cut line. In the case where the joint cap 2 has an inner lid 21 (see FIG. 2) as in this embodiment, the refill bottle 3 is sealed by the inner lid 21 to prevent the contents from leaking, so the break assistance line may be composed of a line with a through hole. However, this is not limited to the present embodiment, and the inner lid 21 may not be provided. When the inner lid 21 is not provided, it is preferable that the breakage assistance line 11 is configured as a line without a through hole, from the viewpoint of preventing the content of the refill bottle from leaking.

[0019] In the drawings, the break assist line 11 is shown as a broken line, but the break assist line 11 may be a perforation consisting of a number of dot-like through holes arranged in a line, regardless of the size or pitch of the broken line, and when the break assist line 11 is a broken line consisting of a number of short cut lines or half-cut lines arranged in a line, the size or pitch of the broken line may be constant or random (see FIG. 5(c)). Also, the entire break assist line 11 may be an uninterrupted half-cut line. When the break assist lines 11 are perforations or dashed lines, the shape (arrangement) of each break assist line does not need to be rotationally symmetric. For example, in the case of dashed lines, as shown in Fig. 5(d), the cut line (or half cut line) may have a cut line passing through the center 10 only for the break assist lines 11 in one direction, and the break assist lines 11 in the other directions may have no cut line passing through the center 10. In addition, in the fracture assistance lines 11 shown in FIGS. 5(c) and (d), the arrangement of the cut lines that constitute the actual fracture assistance lines is shown.

[0020] In plan view (plan view seen from a direction perpendicular to the main surface of the seal 1), the base material layer 1a of the seal 1 has a break assistance line 11 in the central portion including its center 10 (part other than the outer periphery).

[0021] It is preferable that the fracture assistance line 11 has a shape that is rotationally symmetrical about the center 10 in a plan view. "Rotational symmetry" is a symmetry that overlaps with itself when rotated a certain angle around a center. A "rotationally symmetric shape" can also be said to be a shape consisting of multiple identical shapes evenly spaced around the center. The predetermined angle is not particularly limited, but is an angle obtained by dividing 360° by an integer equal to or greater than 2. Examples of the predetermined angle include 180° (in the case of 2-fold symmetry), 120° (in the case of 3-fold symmetry), 90° (in the case of 4-fold symmetry), 72° (in the case of 5-fold symmetry), and 60° (in the case of 6-fold symmetry). The center of the base material layer 1a (seal 1) is the center of the circle if the shape (shape when viewed in a plane) of the base material layer 1a is circular, and is the center of gravity of the shape if the shape of the base material layer 1a is other than circular. In the present invention, a "rotationally symmetric shape" does not only mean a completely rotationally symmetric shape, but also includes a shape close to rotational symmetry within a range in which the problem of the present invention can be solved.

[0022] The fracture assist lines preferably include a plurality of radial line segments extending radially from the center 10 of the base layer 1a. In this case, the rotationally symmetric shape is, for example, a shape in which a plurality of radial line segments (fracture assist lines 11) extending radially from the center 10 are evenly arranged in the circumferential direction, as shown in Figs. 1 and 4. In this case, when the seal 1 breaks, the break assist line breaks from the center side, so that the seal 1 is likely to be divided evenly in the circumferential direction, and liquid leakage and inclusion of broken fragments can be more reliably prevented.

[0023] However, a rotationally symmetric shape may be a shape that does not include multiple radial line segments extending radially from the center 10, and for example, circles, ellipses, and rotationally symmetric polygons (e.g., regular polygons, rhombus, etc.) are also included in rotationally symmetric shapes (see Figure 8). Note that shapes formed by a combination of radial line segments and other line segments, such as the H-shape shown in FIG. 4(f), can also be included in the rotationally symmetric shapes.

[0024] It is preferable that the center of the base material layer 1a (seal 1) in the above plan view approximately coincides with the center of the water receiving rod 4 (the center defined in the same manner as above) in the same plan view as above in a state in which the water receiving rod 4 is inserted into the opening 20 of the joint cap 2 (connected state). In other words, it is preferable that the seal 1 is attached in a predetermined range including the periphery of the opening 20 of the joint cap 2 so as to be disposed in such a manner. In this case, when the seal 1 breaks, the seal 1 is more likely to be divided evenly in the circumferential direction.

[0025] In this embodiment, even if the seal 1 breaks when the water receiving rod 4 is inserted into the opening 20 blocked by the seal 1 , the broken pieces do not leave the outer periphery of the seal 1 . That is, the breakage assistance line 11 has a shape such that even if the seal 1 breaks when the water receiving rod 4 is inserted into the opening 20 blocked by the seal 1, the broken pieces will not leave the outer periphery of the seal 1. This prevents a plurality of broken pieces of the seal 1 from getting caught in the gap between the opening 20 and the water receiving rod 4, causing liquid leakage, preventing the broken pieces of the seal 1 from mixing with the liquid inside the refill bottle, and preventing the mixed broken pieces from blocking the water receiving hole 41 of the water receiving rod 4.

[0026] It is preferable that such a breaking assist line has a shape such that even if the entire breaking assist line 11 breaks, the broken pieces will not separate from the outer periphery of the seal 1. Examples of break assist lines in which the broken fragments do not separate from the outer periphery of the seal 1 even when the entire break assist line 11 breaks include break assist lines that include radial line segments extending radially (diametrically) from the center 10 of the seal 1, and in which each of the break assist lines including the radial line segments is not in contact with the other break assist lines, such as the break assist lines shown in Figures 1 and 4 to 7. In this case, each of the rupture assist lines 11 including the radial line segments is disposed approximately evenly in the circumferential direction of the center 10, and the seal 1 is easily ruptured approximately evenly in the circumferential direction, so that the above-mentioned liquid leakage and inclusion of broken fragments can be more reliably prevented (see FIG. 4).

[0027] However, as shown in Figures 8 and 9, even if the break assistance line 11 is shaped such that if the entire line breaks and the broken fragments are separated from the outer periphery of the seal 1, when the seal 1 breaks by inserting the water receiving rod 4 into an opening 20 blocked by the seal 1, if even if part of the break assistance line 11 breaks, the entire line does not break and the broken fragments do not separate from the outer periphery of the seal 1, liquid leakage and mixing of the broken fragments can be prevented in the same manner as described above. Examples of such fracture assist lines include fracture assist lines having a polygonal, circular, or elliptical shape (see Figs. 8 and 9). Examples of polygonal shapes include regular polygons (Figs. 8(c) to (e)), but polygons other than regular polygons may also be used as long as they have a rotationally symmetric shape (for example, a rhombus or hourglass shape as shown in Figs. 9(a) and (b)). In the case of a polygon, there may be a break assist line near each vertex, but it is preferable that there is no break assist line. If there is no break assist line near each vertex of the polygon, the broken pieces will more reliably remain connected to the outer periphery of the seal 1 near each vertex, so that the above-mentioned liquid leakage and mixing of the broken pieces can be more reliably prevented.

[0028] Furthermore, in the seal 1 of this embodiment, in plan view, the adhesive layer 1b is also present in the range (center) where the breakage assistance line 11 is provided. With the adhesive layer 1b present in this range, when the seal 1 is broken by inserting the water receiving rod 4 into the opening 20 blocked by the seal 1, the broken pieces of the seal 1 are attached to the inner wall of the opening 20 by the adhesive layer 1b, so that the above-mentioned liquid leakage and intrusion of the broken pieces can be more reliably prevented.

[0029] Referring to Figure 5(a), it is preferable that the outer end 11a of the radial line segment (breakage auxiliary line 11) reaches the portion where the adhesive layer 1b is attached to the joint cap 2 in a planar view (attached portion: the portion outside the inner peripheral edge 13 in Figure 5(a)). In this case, when the seal 1 breaks, the break assist line is likely to break reliably from the center side to the peripheral edge of the opening 20. This prevents the seal 1 from breaking irregularly along the way, making it easier to more reliably break the seal 1 evenly in the circumferential direction. Also, as shown in FIG. 5(b), even if the outer end 11a of the radial line segment (break assistance line 11) does not reach the adhesive portion, it is preferable that the outer end 11a is close to the adhesive portion for the same reason. As shown in Fig. 11, an inclined portion 20a may be provided at the opening 20 of the joint cap 2. This allows the water receiving rod 4 to be smoothly inserted into the opening 20. In this case, the diameter of the inner peripheral edge 13 of the adhesive portion is larger than the diameter 20D of the opening 20. It is preferable that the outer end 11a of the radial line segment (breakage assistance line 11) reaches the outer peripheral edge of the opening 20 even if it does not reach the adhesive portion.

[0030] 1, 4, etc., the number of radial lines (break assist lines 11) extending radially from the center 10 of the seal 1 is preferably 2 to 10, and more preferably 4 to 8. The number of radial lines (break assist lines 11) shown in Fig. 4(e) is 2.

[0031] Referring to FIG. 6, it is preferable that a break stop portion 12 is provided at the outer end of the radial line segment (break assist line 11). The breakage stopper 12 is not particularly limited as long as it is a part of the breakage assist line having a shape effective in stopping breakage, but may be, for example, a line segment having a portion bent from a radial line segment (radial direction). Examples of such a line segment include a hook-shaped or U-shaped line segment (FIG. 6(c)) as shown in FIG. 6, and a circular line segment (FIG. 6(d)).

[0032] With reference to FIG. 7(a), the breakage stopper 12 is preferably provided in a portion where the adhesive layer 1b is attached to the joint cap 2 in a plan view (attached portion: a portion outside the inner peripheral edge 13 in FIG. 7). In this case, when the seal 1 breaks, the break assist line is likely to break reliably from the center side to the peripheral edge of the opening 20. This prevents the seal 1 from breaking irregularly along the way, making it easier to more reliably break the seal 1 evenly in the circumferential direction. Incidentally, even if the outer end 11a of the radial line segment (break assistance line 11) does not reach the adhered portion as shown in FIG. 7(b), it is preferable that the outer end 11a is close to the adhered portion for the same reason.

[0033] (base material layer) The material of the base layer 1a is not particularly limited, and may be, for example, a resin film or paper. From the viewpoint that the sticker 1 is easily broken along the break assist line, a resin film is preferable. From the viewpoint of reducing the environmental load, paper is preferable.

[0034] Examples of materials for the resin film include polyethylene-based resins, polypropylene-based resins, cyclic olefin-based resins, polyolefin-based resins such as copolymers containing polyethylene, polyester-based resins such as polyethylene terephthalate, polyamide-based resins, polystyrene-based resins, and (meth)acrylic resins. Examples of polyethylene-based resins include polyethylene terephthalate.

[0035] Examples of paper include unprocessed paper such as plain paper (medium-quality paper), fine paper, and synthetic paper, and processed paper such as coated paper, glossy paper, and matte paper. The use of paper that contains a high proportion of paper material (pulp) can contribute to reducing the environmental impact.

[0036] When the material of the base material layer 1a contains a plant-derived material, a biomass-derived material, a recycled material, a biodegradable material, a natural material, or the like, it can contribute to reducing the environmental load.

[0037] The material (paper, resin film, etc.) of the base layer 1a is preferably a material that does not pose a problem in terms of food hygiene. Examples of materials that do not pose a problem in terms of food hygiene include materials listed on the positive list (materials that are recognized as not likely to harm human health under the positive list system based on Article 18, paragraph 3 of the revised Food Sanitation Act and Notification No. 370). An example of a commercially available product of a base layer with an adhesive layer is "BA6141-80" manufactured by Lintec Corporation.

[0038] The thickness of the seal 1 (total thickness including the base layer 1a, adhesive layer 1b, etc.) is not particularly limited, but is preferably 150 μm or less, more preferably 120 μm or less, and even more preferably 100 μm or less. From the viewpoint of preventing water leakage when a broken portion of the seal 1 becomes caught between the opening 20 and the water receiving rod 4, and from the viewpoint of reducing the environmental load, it is preferable that the thickness of the seal 1 is thin. However, from the viewpoint of preventing tearing or the like before use (before connection) and from the viewpoint of having a strength sufficient to not easily break even in places where there are no break assistance lines when the liquid server's receiving rod 4 is inserted into the opening 20 of the joint cap 2, it is preferable that the seal 1 have a thickness greater than a specified thickness. From the viewpoint of obtaining a thin and strong base layer, the base layer 1a is preferably made of resin.

[0039] The shape (shape in the above plan view) of the seal 1 (base material layer 1a, etc.) is preferably a rotationally symmetric shape. Examples of the shape of the seal 1 (base material layer 1a, etc.) include a circle, an ellipse, and a regular polygon.

[0040] When the seal 1 has a polygonal (regular polygonal) shape in plan view, it is preferable that the same number of tear assist lines as the number of vertices of the polygon extend from the center of the polygon to each vertex. The number of corners (vertices) of the polygon is preferably 3 to 10, and more preferably 4 to 8.

[0041] (Adhesive layer) The adhesive layer 1b contains an adhesive for adhering the base material layer 1a to the joint cap 2. The adhesive is not particularly limited, but is preferably one having a suitable adhesiveness for use as a seal. Examples of the adhesive include pressure-sensitive adhesives and heat-sensitive adhesives. It is preferable that the adhesive layer 1b provided on the base layer 1a is not subjected to a treatment for partially losing adhesiveness, such as bonding a mask layer (adhesive suppressing layer).

[0042] The material of the adhesive layer 1b is also preferably a material that does not pose a problem in terms of food hygiene. Examples of such adhesive layer materials include materials listed on the positive list. However, materials other than those listed on the positive list can also be used as long as they do not pose a safety problem.

[0043] (printing layer, cover layer) A printed layer (display layer) or a cover layer 1c may be formed on the opposite side (front side) of the adhesive layer 1b of the base material layer 1a. The cover layer 1c protects the surface of the base material layer 1a or the printed layer and enhances the decorativeness of the sticker 1. When a printed layer (not shown) and a cover layer 1c are formed, the cover layer 1c is usually provided on the side of the printed layer opposite to the base layer 1a (on the outermost surface side).

[0044] The cover layer 1c may also have a break assist line similar to that of the base layer 1a. In this case, the break assist line of the cover layer 1c may be provided at the same position as the break assist line of the base layer 1a in a plan view, or may be provided at a position shifted from the break assist line of the base layer 1a. In the former case, since the cover layer 1c is easily broken like the base layer 1a, the break of the seal 1 including the cover layer 1c and the break of the base layer 1a are easily controlled by the break assist line. In the latter case, even if the break assist line is a line having a through hole, the position of the through hole is shifted between the base layer 1a and the cover layer 1c, so that the dustproofness of the seal is improved.

[0045] <Joint cap> According to this embodiment, A joint cap for a refill bottle of a liquid server, The joint cap has an opening, A joint cap (with seal) may be provided, the opening of which is closed with the seal described above.

[0046] <Refill bottle> According to this embodiment, A refill bottle for a liquid server, A joint cap having an opening is provided, A refill bottle may be provided having an opening closed with a seal as described above.

[0047] The present invention is not limited to the above-described embodiment, and can be modified in various ways. Two or more embodiments selected from the various embodiments described above may be combined as appropriate, or at least one configuration (a portion of a configuration) selected from the various embodiments described above may be replaced with a portion of a configuration of another embodiment.

[0048] (summary) The above-mentioned embodiments of the present invention will be illustrated below.

[0049] (1) A seal for closing the opening of a joint cap of a refill bottle for a liquid server, The refill bottle and the liquid server are connected by inserting the water receiving rod of the liquid server into the opening, The seal is composed of a laminate including a base layer and an adhesive layer, The base material layer has a fracture assist line in a central portion including a center thereof in a plan view, Even if the seal is broken by inserting the water receiving rod into the opening blocked by the seal, the broken pieces do not separate from the outer periphery of the seal, The adhesive layer is also present in the area where the break assist line is provided. seal.

[0050] (2) The seal according to (1), wherein the break assistance line has a shape that is rotationally symmetrical with respect to the center.

[0051] (3) The seal according to (2), wherein the break assist line includes a plurality of radial line segments extending radially from the center of the base material layer.

[0052] (4) The seal according to (3), wherein the outer ends of the radial line segments are located in a portion where the adhesive layer is attached to the joint cap in the planar view.

[0053] (5) The sticker according to (3), wherein the number of the radial line segments is 4 to 8.

[0054] (6) A seal as described in (3) above, wherein a break stop is provided at the outer end of the radial line segment.

[0055] (7) The seal according to (6), wherein the radial lines are provided at a portion where the adhesive layer is attached to the joint cap in the planar view.

[0056] (8) A joint cap for a refill bottle of a liquid server, The joint cap has an opening, A joint cap, the opening of which is sealed with the seal according to any one of (1) to (7).

[0057] (9) A refill bottle for a liquid server, A joint cap having an opening is provided, A refill bottle, the opening of which is sealed with the seal described in (1) to (7). [Explanation of symbols]

[0058] 1 Seal 1a Base material layer 1b Adhesive layer 1c Cover layer 10 center 11 Breaking aid line 11a Outer edge 12 Break Stop 13 Inner edge (of the attachment part) 2 Joint Cap 20 Opening 20a Slope 21 Inner lid 21a Protrusion 3 Refill Bottles 4 Water receiving rod 41 Water receiving hole 42 Recess 5 Liquid Server

Claims

1. A seal for closing an opening of a joint cap of a refill bottle for a liquid server, The refill bottle and the liquid server are connected by inserting the water receiving rod of the liquid server into the opening, The seal is composed of a laminate including a base layer and an adhesive layer, The base material layer has a fracture assist line in a central portion including a center thereof in a plan view, Even if the seal is broken by inserting the water receiving rod into the opening blocked by the seal, the broken pieces do not separate from the outer periphery of the seal, The adhesive layer is also present in the area where the break assist line is provided. seal.

2. The seal according to claim 1 , wherein the break assist line has a shape that is rotationally symmetrical about the center.

3. The seal according to claim 2 , wherein the tear assist line includes a plurality of radial line segments extending radially from a center of the base material layer.

4. The seal according to claim 3 , wherein outer ends of the radial line segments are located at a portion where the adhesive layer is attached to a joint cap in a plan view.

5. A joint cap for a refill bottle of a liquid server, The joint cap has an opening, A joint cap, wherein the opening is sealed with the seal according to any one of claims 1 to 4.

6. A refill bottle for a liquid server, A joint cap having an opening is provided, A refill bottle, the opening of which is sealed with the seal according to claims 1 to 4.

Images