Structure of spout, packaging, and method for closing packaging

Abstract

To provide: in a plug closing process of a mouth plug part applicable to a package, a structure of a mouth plug part capable of preventing interference between a female thread on the inner peripheral surface of a cap and an opening of a pouring part; a package; and a closing method of the package having such a structure of the mouth plug part.SOLUTION: A structure of a mouth plug part having a pouring part having a cylindrical outer peripheral surface with an opening formed at a tip, and a cap having cylindrical shape that can cover the pouring part and closing the opening when attached to the pouring part, in which: a male thread is formed on the cylindrical outer peripheral surface, and a female thread to be screwed into the male thread is formed on the inner peripheral surface of the pouring part: and the female thread has a top surface of the female thread and an inclined surface made by chamfering an intersection with at least one of the upper surface of the female thread and the lower surface of the female thread extending from the top surface toward the base of the female thread.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a spout structure, a package, and a method for closing a package. [Background technology]

[0002] There is known a pouch (package) with a spout that can contain a fluid content in a liquid-tight manner and easily pour the content out as needed. The spout pouch includes a pouch (container) and a spout main body (spout), and the spout can be opened and closed by a cap that is detachably fixed to the spout provided at the tip of the spout. One example of such a spout pouch is one in which the spout is closed by threading a male screw formed on the outer peripheral surface of the spout into a female screw formed on the inner peripheral surface of the cap (see, for example, Patent Document 1).

[0003] A spout-equipped pouch is filled with a content such as a beverage through a dispensing portion, mainly by a filling machine. The dispensing portion is then closed with a cap. Known methods for closing the dispensing portion of a spout-equipped pouch include placing a cap, which is waiting with its opening facing downward, over the dispensing portion and then screwing the male thread of the dispensing portion onto the female thread of the cap to close it, and moving the spout-equipped pouch so that the edge of the opening of the dispensing portion is hooked onto the cap, which is waiting with its opening facing diagonally downward, and then holding the cap upright and screwing the male thread of the dispensing portion onto the female thread of the cap to close the dispensing portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-331124 Summary of the Invention [Problem to be solved by the invention]

[0005] In the manufacture of spouted pouches, there is a need to reduce the amount of resin used from an environmental perspective, and efforts are being made to reduce the weight of the cap. Possible methods for reducing the amount of resin used include, for example, reducing the thickness of the cap or lowering the cap's threads. However, reducing the cap's thickness reduces the strength of the cap itself, raising concerns that the cap may become more susceptible to breakage. Furthermore, lowering the cap's threads increases the likelihood of rattle when the cap is tightened. If the cap is tightened in a state of rattle, there is a risk of damage to the threads.

[0006] An example of a case in which scratches are caused by the threads of a cap is the process of attaching a cap to a spouted pouch containing contents. For example, in a method in which a spouted pouch is moved toward a cap with its opening facing diagonally downward so as to hook the edge of the opening of the spouting portion, thereby standing the cap upright and closing the spouting portion, scratches or dents may occur in the opening of the spouting portion when the spouting portion moving toward the cap held at an angle collides with the female threads formed on the inner surface of the cap. In particular, if the filling speed of spouted pouches is increased (the rotation speed of the filling machine is increased) in order to increase productivity, the frequency of scratches and dents in the spouting portion increases, and the severity of the scratches and dents that occur increases.

[0007] As a more detailed example of scratches caused by the threads of a cap, as shown in Figure 5, female thread 102 formed on inner surface 101a of cap 101 constituting a conventional spouted pouch has an acute angle at intersection C3 between top surface 102s and underside 102b of female thread 102, which spreads from top surface 102s toward base B2 of female thread 102. For this reason, in the process of standing cap 101 upright in an inclined state to close the spouting part, such acute-angled intersection C3 can cause scratches or dents in the opening of the spouting part, which can cause discomfort when the user holds it in their mouth.

[0008] The present invention has been made in consideration of the above circumstances, and aims to provide a spout structure that can achieve a lightweight cap, ensure sufficient strength for the cap, and prevent interference between the female thread on the inner surface of the cap and the opening of the spout during the spout ... [Means for solving the problem]

[0009] In order to solve the above problems, the present invention proposes the following means. That is, the structure of the spout part of the present invention is a structure of a spout part used for a pouch containing contents to be taken orally, comprising: a pouring part made of polyolefin, having a cylindrical outer circumferential surface with an opening at the tip, and to be used by a user by holding it in the mouth; and a cap made of polyolefin, having a cylindrical shape capable of covering the pouring part, and closing the opening when attached to the pouring part, wherein a male thread is formed on the outer circumferential surface of the pouring part, and a female thread that screws onto the male thread is formed on the inner circumferential surface of the cap, The female screw is formed at the same height all around except for the starting end, The female screw has a top surface of the female screw thread that has a linear surface along the central axis in a cross section along the central axis of the cap, and an upper surface and a lower surface of the female screw thread that extend from the top surface toward the base of the female screw thread. and the top surface Only the intersection with the underside of the female thread is chamfered a chamfered portion; and a corner portion formed by not chamfering an intersection portion between the top surface and the upper surface of the female screw thread; and Chamfered part is formed only in the region from the top surface of the female thread to the bottom surface of the female thread. The chamfered portion has an inclined surface inclined with respect to the top surface and the underside of the female thread, and a corner between the top surface and the inclined surface and a corner between the inclined surface and the underside of the female thread are chamfered. It is characterized by being

[0011] In addition, in the present invention, in the cross section of the female thread, the starting point of the inclined surface on the apex side may be between the middle part of the width of the female thread and the intersection part between the apex surface and the upper surface of the female thread.

[0012] In the present invention, the pouring portion and the cap have a density of 0.940 g / cm 3 More than 0.965g / cm 3 It may be made of the following high density polyethylene:

[0013] The packaging body of the present invention is a packaging body having the spout portion structure described in each of the above items, the spout portion, the cap, The aforementioned Contains contents The pouch and

[0014] The method for closing a package of the present invention is a method for closing a package having a spout structure described in each of the above paragraphs, and is characterized by including the steps of holding the pouring part so that the central axis of the pouring part is aligned vertically, holding the cap so that the central axis of the cap is inclined at a predetermined angle to the vertical, moving the pouring part and the cap relative to each other so that they approach each other, hooking the opening of the cap onto the opening of the pouring part, and standing the cap upright so that the central axis of the cap is aligned vertically. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a spout structure that can achieve weight reduction of the cap, ensure sufficient strength of the cap, and prevent interference between the female thread on the inner surface of the cap and the opening of the spout during the process of closing a spout that can be applied to a package, a package, and a method for closing a package having such a spout structure. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing one embodiment of a packaging body including a spout unit (spout portion) to which the spout portion structure of the present invention is applied. [Figure 2] FIG. 2 is a cross-sectional view taken along the central axis Q of the cap. [Figure 3] FIG. 2 is an enlarged cross-sectional view of a main portion showing the female threads that constitute the female screw of the cap. [Figure 4] 1 is a schematic diagram showing a method for capping a package of the present invention. [Figure 5] FIG. 10 is an enlarged cross-sectional view of a main portion showing the female threads that constitute the female screw of a conventional cap. [Figure 6] FIG. 10 is an enlarged cross-sectional view of a main part showing another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The structure of a spout, a package, and a method for closing a package according to one embodiment of the present invention will be described below with reference to the drawings. Note that the following embodiment is specifically described to provide a better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified. Furthermore, the drawings used in the following description may show essential parts enlarged for convenience in order to make the features of the present invention easier to understand, and the dimensional proportions of each component may not necessarily be the same as those in reality.

[0018] (Seal structure, packaging) FIG. 1 is a perspective view showing one embodiment of a package including a spout unit (spout portion) to which the spout portion structure of the present invention is applied. A packaging body (spout-equipped pouch) 10 for liquid-tightly storing contents is provided with a spout unit (spout portion) 1 having the spout portion structure of the present invention. This spout unit (spout portion) 1 is provided at the vertical upper part of a container (pouch) 11 when the packaging body (spout-equipped pouch) 10 is stood upright as shown in Fig. 1, and is composed of a pouring portion main body 20 attached to the upper end of the container 11, and a cap 2 that screws onto a cylindrical pouring portion 21 formed at the upper part of the pouring portion main body 20 and closes the pouring portion 21. The spout unit 1 is attached to the upper end of the container 11 so that the lower part of the pouring portion main body 20 is inserted into the interior of the container 11.

[0019] The contents to be contained in the container (pouch) 11 can be any liquid or solid with fluidity, such as liquids such as soft drinks and juices, fluids such as ice cream, jelly, cosmetics, shampoo, conditioner, and liquid soap, or powders, granules, and pastes.

[0020] Spout body 20 has a cylindrical spout 21 formed at its top, with one end forming opening 21a, and a long, thin cylindrical straw portion 22. Between spout body 21 and straw portion 22 are layered pedestals 23a, 23b, and 23c that extend horizontally outward from the outer periphery of spout body 20, and an attachment portion 24 that is adhered to the upper end of container 11 below pedestals 23a, 23b, and 23c.

[0021] The straw part 22 formed at the bottom of the spout main body 20 is formed in a long, thin cylindrical shape and is inserted into the container 11. The straw part 22 has an opening 22a at its bottom end, and also has long holes 22b, 22b formed on the side surface that connect the inside and outside of the straw part 22.

[0022] Furthermore, straw portion 22 is provided with plate-like members 22c, 22c that protrude to both sides from the outer circumferential surface at locations corresponding to slots 22b, 22b. Because straw portion 22 is formed in this shape, even if the volume of container 11 decreases when the contents are poured out from pouring portion 21 and the inner surface of container 11 comes into close contact with straw portion 22, the contents can be guided into straw portion 22 from slots 22b, 22b in addition to opening 22a. At this time, plate-like members 22c, 22c prevent the inner surfaces of container 11 from coming into close contact with each other, ensuring a flow path for the contents until they reach slots 22b, 22b.

[0023] The mounting portion 24 is formed so as to protrude to the left and right along the width direction of the container 11. The upper edge of the container 11 is adhered to the outer surface of the mounting portion 24, and the two are adhered liquid-tightly by heat sealing means or the like so that no gap is formed between them. In addition, the bases 23a, 23b, and 23c are formed so as to have three layers, one above the other.

[0024] Each of pedestals 23a, 23b, 23c is formed in an octagonal shape that is laterally long, and projects horizontally from the outer circumferential surface of pouring portion 21, with pouring portion 21 at the center. The lower surface of bottommost pedestal 23c abuts against the upper edge of container 11, preventing pouring portion main body 20 from falling into container 11 during the manufacturing process.

[0025] The pouring portion 21 located at the top of the pouring portion main body 20 is formed in a cylindrical shape, and a helical male thread 26 is formed on its outer circumferential surface 21b. This male thread 26 meshes with a female thread 15 formed on the cap 2, which will be described later, and screws the cap 2 onto the pouring portion 21. In this way, the cap 2 is detachably attached to the pouring portion 21, and the pouring portion 21 can be closed.

[0026] Male thread 27, which constitutes male screw 26 and protrudes from outer peripheral surface 21b of pouring portion 21, is formed, for example, so as to make two to four turns around outer peripheral surface 21b of pouring portion 21. Male thread 27 may be formed without interruption from the start end to the end end in the extension direction, or, as in this embodiment, may have interruptions formed at any location.

[0027] A pair of stoppers 25, 25 are formed at the lower end of the pouring portion 21, protruding outward from the outer circumferential surface of the pouring portion 21. The stoppers 25 may be formed around the entire periphery of the outer circumferential surface of the pouring portion 21 or only on a part of it, and the form thereof is not limited.

[0028] The cap 2 is composed of a cylindrically formed cap body 3 and a band 4 that is provided at the lower end of the cap body 3, protruding outward from the outer periphery of the cap body 3 and extending in the circumferential direction of the cap 2.

[0029] FIG. 2 is a cross-sectional view taken along the central axis of the cap. The cap body 3 is formed in a cylindrical shape that is capable of covering the pouring portion 21 (see FIG. 1), with the top surface 3s, which is one end along the central axis Q, being closed, and the bottom surface, which is the other end, being open as an opening 3c. A spiral female thread 15 is formed on the inner peripheral surface 3a of the cap body 3, and is configured so as to be able to screw into a male thread 26 formed on the outer peripheral surface 21b (see FIG. 1) of the pouring portion 21 that constitutes the pouring portion main body 20.

[0030] Furthermore, a cylindrical seal body 18 protrudes downward radially inward from the inner circumferential surface 3a inside the upper surface 3s of the cap body 3. When the cap 2 is screwed onto the pouring portion 21, the inner circumferential surface 21d of the pouring portion 21 (see FIG. 1) is brought into close contact with the outer surface 18a of the seal body 18, thereby preventing the contents from leaking out.

[0031] Meanwhile, a plurality of grooves 17...17 (see FIG. 1) extending parallel to the central axis Q are formed all around the outer circumferential surface 3b of the cap body 3. These grooves 17...17 form unevenness on the outer circumferential surface 3b of the cap body 3, and function as a non-slip surface when the user rotates the cap 2 with their fingertips.

[0032] The band 4 constituting the cap 2 is divided into two parts in the circumferential direction, for example, and is composed of two band pieces 5, 5 (see FIG. 1). The opposing ends of each of these band pieces 5, 5 are connected by cut pieces 6, 6.

[0033] FIG. 3 is an enlarged cross-sectional view of a main part showing the female threads that constitute the female screw of the cap. The female screw 15 formed on the inner peripheral surface 3a of the cap body 3 has a female thread 16 that extends spirally so as to protrude from the inner peripheral surface 3a. The female thread 16 is formed so as to wrap around the inner peripheral surface 3a of the cap body 3, for example, two to four times.

[0034] The female thread 16 constituting the female screw 15 has a chamfered inclined surface at the intersection between its top surface 16s and at least one of the female thread upper surface 16a or the female thread lower surface 16b which extend from the top surface 16s toward the base B of the female thread 16. The female thread 16 of this embodiment has a curved surface (inclined surface) R which is an example of an inclined surface shaped like a chamfered intersection C1 between the top surface 16s and the female thread lower surface 16b.

[0035] Such a curved surface (inclined surface) R is formed from the top surface 16s to the female thread bottom surface 16b of the female thread 16. In other words, the curved surface R may be any surface formed so as to curve with an arbitrary curvature from the top surface 16s to the female thread bottom surface 16b between an arbitrary position on the linear top surface 16s in a cross section taken along the central axis Q and an arbitrary position on the linear female thread bottom surface 16b in the cross section.

[0036] The curved surface R is formed when the cap 2 is molded by injection molding using a mold shaped to resemble the curved surface R with a chamfered intersection, but the curved surface R can also be formed in a later process by cutting off part of the female thread so that the intersection has a chamfered shape.

[0037] The curved surface R does not necessarily have to be formed over the entire length from the start to the end of the female thread 16, but may be selectively formed, for example, over only about one circumference from the start of the female thread 16 (the end on the opening 3c side of the cap body 3).

[0038] In the cross section of the female thread 16 (see FIG. 3), when the width of the crest 16s before the formation of the curved surface R, that is, the width between the intersection C1 of the crest 16s and the female thread lower surface 16b and the intersection C2 of the crest 16s and the female thread upper surface 16a, is defined as W1, the starting point of the curved surface R on the crest 16s side can be set between the middle part of W1 (this embodiment) and the intersection C2. When the starting point of the curved surface R on the crest 16s side is set at the intersection C2, there is no flat portion of the crest 16s, and a part of the curved surface R forms the crest of the female thread 16.

[0039] The spout body 20 and the cap 2 that constitute the spout unit 1 as described above may be integrally formed from polyolefin such as polypropylene or polyethylene. Examples of polyethylene include low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE). Of these, high-density polyethylene (density: 0.940 to 0.965 g / cm ) is preferred from the viewpoint of strength, etc. 3 ) is particularly preferably used.

[0040] In addition, the inclined surface formed on the female thread may be a curved surface as in this embodiment, or may be an inclined surface formed by chamfering the intersection with at least one of the upper surface or lower surface of the female thread, which extends from the top surface of the female thread toward the base of the female thread, into a flat surface.

[0041] For example, in another embodiment shown in Fig. 6(a), the female thread 36 of the pouring portion 31 has an inclined surface R2 formed by chamfering the intersection between the top surface 36s and the lower surface 36b of the female thread 36 into a flat surface. Even with such a flat inclined surface R2, the same effect as the curved surface (inclined surface) R of this embodiment, which will be described later, can be obtained.

[0042] Furthermore, as shown in FIG. 6(b), for example, the female thread 36 may be provided with a chamfered portion 37a formed by further chamfering the corner between the flatly chamfered inclined surface R2 in the embodiment of FIG. 6(a) and the top surface 36s of the female thread 36, and a chamfered portion 37b formed by further chamfering the corner between the inclined surface R2 and the female thread lower surface 16b of the female thread 36.

[0043] (Method of closing the package) Next, the function of the spout structure of the present invention and a method for plugging the package 10 including the spout unit (spout) 1 to which the spout structure is applied will be described. In the following explanation, an example is given of a device (a typical rotary filling machine) in which a container 11 having a pouring portion 21 moves along the periphery of the turntable as the turntable rotates toward a cap 2 waiting with its opening facing diagonally downward, causing the opening 21a of the pouring portion 21 to collide with the opening 3c of the cap body 3, causing the cap 2 to stand upright due to this collision, and then the male thread 26 of the pouring portion 21 is screwed into the female thread 15 of the cap 2 to close the spout portion.

[0044] FIG. 4 is a schematic diagram showing a method for capping the package of the present invention. Packaging 10, which contains a fluid as its content in container 11, is placed on a rotating turntable (not shown) of a filling machine and moves toward cap 2, which is held with its central axis Q tilted at an angle of, for example, 30° relative to the vertical and its opening 3c facing diagonally downward. Then, opening 21a of dispensing portion 21 collides with opening 3c of cap body 3. As packaging 10 moves further, opening 3c of cap body 3 hooks onto the edge of opening 21a of dispensing portion 21, causing cap 2 to stand upright so that central axis Q of cap 2 is aligned vertically, thereby covering dispensing portion 21.

[0045] In the process of the cap 2 being erected from a tilted state, the edge of the opening 21a of the pouring portion 21 may collide with the female thread 16 of the female screw 15 formed on the inner peripheral surface 3a of the cap body 3. Even in such a case, a curved surface (inclined surface) R is formed by chamfering the intersection of the top surface 16s of the female thread 16 and the bottom surface 16b of the female thread 16 (see FIG. 3), so the opening 21a of the pouring portion 21 can smoothly climb over the female thread 16 along the curved surface R, compared to conventional caps where the intersection of the top surface of the female thread and the bottom surface of the female thread is at an acute angle.

[0046] Furthermore, even if the pouring portion 21 moves toward the cap 2 held at an angle and collides with the female thread 16 formed on the inner peripheral surface of the cap 2, a curved surface R is formed by chamfering the intersection between the top surface 16s of the female thread 16 and the lower surface 16b of the female thread 16, so that an acute angle does not collide with the opening 21a of the pouring portion 21.

[0047] In this way, by forming a curved surface R on the female thread 16 formed on the inner surface 3a of the cap body 3, interference between the opening 21a of the dispensing portion 21 and the female thread 16 is prevented, and scratches and dents can be effectively prevented from occurring near the opening 21a.

[0048] This makes it possible to increase the filling speed and improve productivity without, for example, reducing the thickness of the cap body or lowering the thread height of the male or female threads, thereby reducing the strength of the cap body or capping performance.

[0049] Furthermore, by forming a curved surface (inclined surface) R on the female thread 16, it is possible to reduce the amount of resin used when molding the pouring portion 21. Such a reduction in the amount of resin used is important in light of the need to reduce plastic waste in recent years.

[0050] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as defined in the claims.

[0051] For example, in the above-described embodiment, the curved surface R is formed only on the lower surface 16b side of the female thread 16, but it is also possible to provide a curved surface R on the upper surface 16a side of the female thread 16, or to provide a curved surface R on both sides. [Example]

[0052] The effects of the present invention were verified. In Invention Examples 1 and 2, a cap having a curved surface formed on the female thread was used, as shown in Fig. 2. The filling speed was set to 35 rpm in Invention Example 1 and 50 rpm in Invention Example 2. Conventional caps in which the intersection between the crest and underside of the female thread forms an acute angle were used as Comparative Examples 1, 2, and 3. The filling speed was set to 35 rpm in Comparative Examples 1 and 3, and 50 rpm in Comparative Example 2. Note that Comparative Example 3 used a sample in which the height of the female thread was slightly lower than that of Comparative Examples 1 and 2.

[0053] The caps of Examples 1 and 2 of the present invention and the caps of Comparative Examples 1, 2, and 3 were capped using a filling machine of the type shown in Figure 4, and the number of caps with burrs on the pouring portion was counted. The results of this verification are shown in Table 1.

[0054] [Table 1]

[0055] According to Table 1, in Invention Examples 1 and 2, out of 1,000 samples, no caps (0) had burrs. On the other hand, in Comparative Example 1, burrs were formed on 40 out of 50 samples, and in Comparative Example 2, burrs were formed on 45 out of 50 samples. Furthermore, in Comparative Example 3, no burrs were formed because the threads were low, but in terms of reducing the weight of the cap, Comparative Example 3 was more than 0.1 g heavier than Invention Examples 1 and 2 and Comparative Examples 1 and 2, and therefore weight reduction was not achieved. Therefore, it was confirmed that the structures of the spout portions of Examples 1 and 2 of the present invention can simultaneously prevent the occurrence of burrs in the spout portion and achieve a lightweight cap. [Explanation of symbols]

[0056] 1...Plug unit (plug part) 10...Package (pouch with spout) 15...Female thread 16...Female thread 16a...Top surface of female thread 16b…Bottom surface of female thread 16s…Top surface 21...Pour part 21a...Aperture 26...Male thread 27...External thread R...Curved surface

Claims

1. A spout structure for a pouch containing contents to be orally ingested, comprising: a spout made of polyolefin, having a cylindrical outer circumferential surface with an opening at the tip, and held in the mouth by a user; and a cap made of polyolefin, having a cylindrical shape capable of covering the spout, and closing the opening when attached to the spout, A male screw is formed on the outer peripheral surface of the pouring portion, and a female screw that screws onto the male screw is formed on the inner peripheral surface of the cap, and the female screw is formed at the same height around the entire circumference except for the starting end, The female screw has a top surface of the female screw thread having a linear surface along the central axis in a cross section along the central axis of the cap, an upper surface and a lower surface of the female screw thread extending from the top surface toward the base of the female screw thread, a chamfered portion formed by chamfering only the intersection portion between the top surface and the lower surface of the female screw thread, and a corner portion formed by not chamfering the intersection portion between the top surface and the upper surface of the female screw thread, the chamfered portion is formed only in a region from the top surface of the female thread to the bottom surface of the female thread, The chamfered portion has an inclined surface that is inclined relative to the top surface and the underside of the female thread, and a corner between the top surface and the inclined surface and a corner between the inclined surface and the underside of the female thread are each chamfered.

2. 2. The structure of a plug according to claim 1, wherein, in a cross section of the female thread, a starting point of the chamfered portion on the top surface side is located between a middle portion of the width of the female thread and an intersection portion between the top surface and the upper surface of the female thread.

3. The pouring portion and the cap have a density of 0.940 g / cm ３ Above, 0.965g / cm ３ 3. The spout structure according to claim 1, wherein the spout structure is made of the following high-density polyethylene:

4. A packaging body having the spout structure according to any one of claims 1 to 3, A package comprising the spout, the cap, and the pouch for accommodating the contents.

5. A method for capping a package having the structure of the spout portion according to any one of claims 1 to 3, comprising: The pouring portion is held so that a central axis of the pouring portion is aligned along a vertical direction, and the cap is held so that a central axis of the cap is inclined at a predetermined angle with respect to the vertical direction; A method for capping a package, comprising the steps of moving the pouring portion and the cap relative to each other so that they approach each other, hooking the opening of the cap onto the opening of the pouring portion, and standing the cap upright so that the central axis of the cap is aligned vertically.

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