JP2018002274A - Hermetically sealing structure and packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetically sealing structure of which a suitable plug opened state can be easily and reliably realized and which can be easily manufactured, and a packaging container.SOLUTION: A hermetically sealing structure comprises: a cylindrical body 20 which defines a bung hole 21; a cap part 30 for hermetically sealing the bung hole 21; an irregular part 24 in which a radial irregularity is repeated in a circumferential direction on an outer peripheral surface of a pedestal part 23 which projects outward in a radial direction from the cylindrical body 20 on which a male thread 22 is formed; and a projection piece 35 which is fitted into a recess 25 of the irregular part 24 on a radial direction outer side with respect to a topped cylindrical body 31 of the cap part 30 on which a female thread 33 engaging with the male thread 22 is formed, and is so configured as to get over a protrusion 26 corresponding to rotation of the cap part 30 with respect to the cylindrical body 20.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a sealing structure and a packaging container, and more particularly to a sealing structure and a packaging container configured to seal a spout by screwing a cap.

  2. Description of the Related Art A packaging container that contains a fluid content and keeps hermeticity by screwing a cap into a spout is widely used. Such a packaging container having a sealing property is useful because it makes it possible to easily extend the storage period of the contents that cannot be used once.

  In Patent Document 1, the body of the container is formed with a body part and an external thread that is a double thread, and the shoulder that connects the cylindrical side wall that forms the spout, the lower end of the side wall, and the body part of the container body And at least two protrusions formed in the vicinity of the lower end of the side wall of the shoulder, and the cap includes a cylindrical threaded portion in which an internal thread that is threadedly engaged with the external screw is formed, and a threaded portion A top surface portion connected to one end of the top surface, a side surface portion connected to the outer periphery of the top surface portion, and a surface including the other end of the threaded portion on the outer side surface of the threaded portion. A packaging container is disclosed that sometimes includes at least two claws that each overlie either of the two protrusions.

JP 2014-024561 A

  According to the packaging container of Patent Document 1, a packaging container that prevents inadvertent opening, can be easily opened and closed, can maintain high sealing performance, and has reduced screw screwing failure during production. It can be provided. However, in order to obtain such an effect with the packaging container of Patent Document 1, the claw of the cap gets over the protruding portion of the container body in a state where the inner thread of the cap is completely screwed into the outer thread of the container body. It is necessary to perform alignment precisely so as to be in the state. Therefore, the packaging container of Patent Document 1 has a high degree of design difficulty, and in reality, errors occur and it is difficult to manufacture accurately.

  Furthermore, according to the packaging container of Patent Document 1, when the closure is completed, a constant sense of resistance and a subsequent “click” sensation are transmitted to the user's fingers, so that a feeling of completion of closure is suitably obtained and reliable closure is achieved. It can be done. However, in the packaging container of Patent Document 1, the feeling that is transmitted to the user's finger at the time of completion of closure ends in an instant, so that there is a possibility that the signal of completion of closure will be missed. Therefore, in the packaging container of Patent Document 1, it is not known whether or not the cap is properly closed, the cap is not tightly tightened and the contents spill, or conversely, the container body or cap is overtightened, that is, overtightened. There is an increased possibility of cracks and breakage.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sealed structure and a packaging container that are easily and reliably realized and can be easily manufactured.

  In order to solve the above-mentioned problems, the present invention is a sealing structure including a cylindrical body that defines a spout and a cap portion that seals the spout, and has a diameter from the cylindrical body on which the first screw is formed. A cylindrical body of the cap portion in which a concavo-convex portion in which the radial concavo-convex portion is repeated in the circumferential direction on the outer peripheral surface of the pedestal portion protruding outward in the direction and a second screw meshing with the first screw is formed. Further, a protruding piece configured to fit in the concave portion of the concavo-convex portion and to get over the convex portion corresponding to the rotation of the cap portion with respect to the cylindrical body is further provided on the outer side in the radial direction.

  Further, when the degree of meshing between the first screw and the second screw is greater, the protruding piece is configured such that a contact surface with the convex portion is increased.

  Furthermore, the said convex part is equally arrange | positioned in the circumferential direction on the said outer peripheral surface, and the number of the said convex parts is comprised by 30 or more and 60 or less, It is characterized by the above-mentioned.

  Furthermore, the pitch of the convex part is 0.6 mm or more and 4.0 mm or less.

  Furthermore, the number of the protruding pieces is plural.

  Further, the projecting piece has a radial overlap width of not more than 0.5 mm with the convex portion when fitted into the concave portion.

  Furthermore, the packaging container according to the present invention is characterized in that a sealed structure having the above-described configuration is used.

  According to this invention, it is a sealing structure provided with the cylinder which prescribes | regulates a spout, and the cap part which seals a spout, Comprising: It protrudes in the radial direction outer side from the cylinder in which the 1st screw was formed. On the outer peripheral surface of the pedestal portion, the concavo-convex portion is formed on the outer side in the radial direction from the crested portion of the cap portion formed with the concavo-convex portion in which the radial concavo-convex is repeated in the circumferential direction and the second screw engaging the first screw. And a projecting piece configured to get over the convex portion corresponding to the rotation of the cap portion with respect to the cylindrical body, so that an appropriate plugged state can be easily and reliably realized and easy to manufacture. A sealing structure can be provided.

  Furthermore, since the sealing structure which has the structure mentioned above is used for the packaging container which concerns on this invention, a suitable plugging state is implement | achieved easily and reliably, and the packaging container which is easy to manufacture can be provided.

It is the one side sectional view in which the front of the tube container as an example of the packaging container which concerns on this embodiment was shown. It is the front view in which a part of container body was shown. It is a top view of a container main body. It is a bottom view of a cap part. It is a longitudinal cross-sectional view of a sealing structure. It is a top view of the container main body which concerns on a modification. It is a bottom view of the cap part which concerns on a modification. It is a bottom view of the cap part which concerns on another modification. It is a bottom view of the cap part which concerns on another modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the packaging container according to the present embodiment will be described in detail. FIG. 1 is a half sectional view showing the front of a tube container 100 as an example of a packaging container according to the present embodiment. Here, for convenience of explanation, the side having the opening for pouring out the contents accommodated in the tube container 100 is the top. FIG. 1 is a cross-sectional view showing the right side of the symmetry center line of the tube container 100.

  As shown in FIG. 1, the tube container 100 includes a container body 10 and a cap part 30. The container body 10 includes a body portion 11 and a cylindrical body 20. The trunk | drum 11 is formed in a cylinder shape, and accommodates the content. The cylindrical body 20 defines the spout 21 of the container body 10. As illustrated in FIG. 1, the body portion 11 and the cylindrical body 20 are connected by a truncated cone-shaped shoulder portion 12 whose length in the radial direction decreases toward the upper side in the axial direction of the tube container 100. Just do it. On the other hand, the cap part 30 has a top cylinder 31 that seals the spout 21 corresponding to the cylinder 20. As illustrated in FIG. 1, the cap portion 30 may include a top-cylindrical outer cylinder 32 on the radially outer side of the top-tubing body 31. A sealing structure 50 is configured by a combination of the cylindrical body 20 and the cap portion 30 having the topped cylindrical body 31.

  Next, the sealing structure 50 according to the present embodiment will be described in detail. FIG. 2 is a front view showing a part of the container body 10. The cylinder 20 is formed with a first screw. On the outer peripheral surface of the cylindrical body 20 illustrated in FIG. 2 and the like, a single screw 22 having a single thread is formed. The first screw may be a double thread or a multiple thread instead of a single thread. Furthermore, since the first screw is not the male screw 22 but is formed on the inner peripheral surface of the cylinder 20, it can also be used as a screw. Note that the cylindrical body 20 may not be circular as long as the thread of the first screw is circular in the horizontal cross section.

  The cylindrical body 20 has a pedestal portion 23 that is connected to the shoulder portion 12 and protrudes outward in the radial direction. The pedestal portion 23 has a flat upper surface and is configured in an annular shape coaxial with the male screw 22. The outer peripheral surface of the pedestal portion 23 is provided with an uneven portion 24 in which radial unevenness is repeated in the circumferential direction.

  FIG. 3 is a plan view of the container body 10. The concavo-convex portion 24 includes a concave portion 25 and a convex portion 26. The convex part 26 illustrated in FIG. 3 is formed in a substantially triangular shape in plan view. The convex portions 26 are preferably arranged at a predetermined pitch P evenly in the circumferential direction. The cylindrical body 20 of the container main body 10 illustrated in FIG. 3 is provided with 45 concave portions 25 and 45 convex portions, respectively. Therefore, the convex part 26 illustrated in FIG. 3 is formed with a central angle of 8 ° with respect to the radial center of the pedestal part 23. In addition, the convex part 26 may be formed with a taper for removing from the mold during molding.

  FIG. 4 is a bottom view of the cap portion 30. A second screw that meshes with the first screw is formed on the top cylinder 31 of the cap portion 30. A screw 33 is formed on the inner peripheral surface of the top cylinder 31 illustrated in FIG. Furthermore, an annular contact ring 34 that protrudes in the axial direction from the lower surface of the top portion of the top cylinder 31 is formed on the inner periphery of the female screw 33. The contact ring 34 corresponds to the cylindrical body 20 of the container body 10 and can seal the tube container 100 by being in close contact with the cylindrical body 20. Furthermore, the cap part 30 is provided with a protruding piece 35 on the outer side in the radial direction from the top cylinder 31. As illustrated in FIG. 1 and FIG. 4, the protruding piece 35 is formed in a flat plate shape that protrudes downward from the top side of the cylindrical body 31 in the axial direction.

  The protruding piece 35 is required to be deformable on the protruding end side. For this reason, the protruding piece 35 is formed with a thickness that allows deformation. Since the protruding piece 35 is provided so as to extend in the axial direction, the protruding piece 35 is formed so as to be along the crested cylindrical body 31, so that the protruding piece 35 can be configured to be thin and easily deformed while maintaining strength. it can.

  FIG. 5 is a longitudinal sectional view of the sealing structure 50. FIG. 5 shows a sealed state in which the cap 30 is completely closed (fully closed) with respect to the cylindrical body 20. In the fully closed sealing structure 50, the tubular body 20 and the contact ring 34 are in close contact with each other, and the spout 21 is blocked by the top tubular body 31.

  The protruding piece 35 is configured to fit into the concave portion 25 of the concave-convex portion 24 and get over the convex portion 26 corresponding to the rotation of the cap portion 30 relative to the cylindrical body 20. The protruding piece 35 is arranged so that the locus drawn when rotating with respect to the cylindrical body 20 overlaps the convex portion 26. In the protruding piece 35 illustrated in FIG. 5 and the like, a part of the inner peripheral side in the vicinity of the lower end of the protruding piece 35 enters between the adjacent convex portions 26. And the protrusion piece 35 can get over the convex part 26 by being comprised so that it can deform | transform when it rotates with respect to the cylinder 20 and contacts the convex part 26. As shown in FIG.

  The protruding piece 35 is configured to generate a sound each time it gets over the convex portion 26. On the outer peripheral surface of the pedestal portion 23, an uneven portion 24 that is repeatedly uneven in the circumferential direction is provided, so that the protruding piece 35 repeatedly generates a sound when rotated with respect to the cylindrical body 20. When the cap part 30 is fully closed with respect to the container body 10, the protruding piece 35 does not get over the convex part 26 and stops generating sound, so whether or not the state of the cap part 30 is fully closed. Can be determined. The sealing structure 50 configured as described above can prevent a problem that the cap part 30 is loosely tightened and the contents are spilled, or that the sealing structure 50 is damaged due to overtightening of the cap part 30.

  In particular, an oil-rich one, which is an example of the contents stored in the container, easily leaks even if the cap is tight and the gap is slight. The leaked oil causes a problem that the hands and surroundings are soiled when handling the container. However, since the tube container 100 in which the sealing structure 50 is used is configured so that it can be determined that the cap portion 30 is properly tightened with respect to the cylindrical body 20, the above-described problems can be reliably prevented. can do.

  FIG. 5 shows the overlapping width B in the radial direction with the convex portion 26 of the protruding piece 35 fitted in the concave portion 25. That is, the overlap width B is the distance between the side in the radial direction of the protruding piece 35 projected onto the plane cut in the radial direction of the cylindrical body 20 and the radial outer end of the convex portion 26. is there. If the overlap width B is too large, the protruding piece 35 becomes a resistance when the cap part 30 is rotated, and the cap part 30 is difficult to rotate. Therefore, it is preferable that the overlapping width B in the radial direction of the protruding piece 35 with the protruding portion 26 when fitted into the recessed portion 25 is 0.5 mm or less.

  It is preferable that the protruding piece 35 is configured to fit into the recess 25 when the degree of meshing between the male screw 22 and the female screw 33 is greater. In other words, the protruding piece 35 is preferably designed so that it does not fit into the recess 25 when the cap part 30 is fully open with respect to the cylindrical body 20 but fits when it is fully closed. With this configuration, when the protruding piece 35 rotates with respect to the cylindrical body 20, no sound is generated from the fully open state to the middle, and the protruding piece 35 comes into contact with the convex portion 26. The sound will be generated during the period from the start to the fully closed state.

  When the number of the convex portions 26 is too small, it becomes difficult for sound to be continuously generated when the protruding piece 35 rotates with respect to the cylindrical body 20. On the other hand, when the number of the convex portions 26 is too large, the concave-convex portions 24 are not properly formed and the cylindrical body 20 is difficult to be formed. Therefore, it is preferable that the number of convex portions 26 is 30 or more and 60 or less. The sealing structure 50 configured as described above can easily confirm that no sound is generated, and can appropriately recognize that the cap portion 30 is fully closed with respect to the cylindrical body 20. .

  FIG. 6 is a plan view of a container body 10 according to a modification. The cylindrical body 20 of the container body 10 according to the modification shown in FIG. 6 is provided with 30 concave portions 125 and 30 convex portions 126 each. Therefore, the convex part 126 illustrated in FIG. 6 is formed with a central angle of 12 ° with respect to the radial center of the pedestal part 23.

  Furthermore, when the pitch P is too narrow, the convex portions 26 and 126 are difficult to be molded, and the protruding piece 35 is difficult to fit into the concave portions 25 and 125, so that it is difficult to generate sound. On the other hand, if the pitch P is too wide, the generated sound will not be continuous. Therefore, it is preferable that the pitch P of the convex parts 26 and 126 is 0.6 mm or more and 4.0 mm or less.

  Since the sealing structure 50 is configured so that the generated sound is continuous, the reliability in determining the closing state of the cap portion 30 is improved. For this reason, it is preferable that the number of sounds generated from the fully open state to the fully closed state of the cylindrical body 20 is at least five. Since the sound is continuously generated by the sealing structure 50 configured as described above, the user can surely hear the generated sound, and the tightness of the cap portion 30 with respect to the cylindrical body 20 can be appropriately set. I can grasp it.

  Even when the sealing structure 50 is configured to increase the intensity of the generated sound, the reliability in determining whether the cap portion 30 is closed is improved. For this reason, it is preferable that the sound intensity generated when the cap portion 30 is rotated at a speed of at least 30 rpm with respect to the cylindrical body 20 is greater than −35 dB at the sound pressure level. Since the sound generated by the sealing structure 50 configured as described above is sufficiently strong, the user can surely hear the generated sound, and the tightening degree of the cap portion 30 with respect to the cylindrical body 20. Can be grasped appropriately.

  FIG. 7 is a bottom view of the cap portion 130 according to the modification. It is preferable that the number of the protruding pieces 35 is a plurality, so that the strength of the generated sound can be increased. However, the protruding piece 35 can also be configured alone. In the circumferential direction of the outer peripheral surface of the pedestal portion 23, the concavo-convex portion 24 is provided so that the concavo-convex portion is repeated. Therefore, even if the protruding piece 35 is alone as in the cap portion 130 illustrated in FIG. During the rotation, it will surely fit into the recess 25. Therefore, since it can be configured to reliably generate sound even when the unevenness portion 24 in the fully closed state of the sealing structure 50 and the protruding piece 35 are not strictly aligned, the sealing structure 50 50 can be easily manufactured.

  As described above, the first screw may not be a single thread, but may be a double thread or a multiple thread, and the corresponding second screw is not a single thread but a double thread or a multiple thread. Also good. FIG. 8 is a bottom view of a cap portion 230 according to another modification. In the cap part 230 illustrated in FIG. 8, female threads 133 having two threads are formed. The larger the number of screws, the smaller the angle at which the cap 30 rotates from the fully open position to the fully closed position with respect to the cylindrical body 20, and the fastening is completed quickly with a small amount of tightening rotation, but the number of sounds generated is small. There is a tendency to decrease. Therefore, as illustrated in FIG. 8, in the sealing structure 50 in which the double threaded screw 133 is used, the number of the convex portions 26 is increased, and the length of the concave and convex portions 24 in the axial direction is increased. It may be configured so that.

  FIG. 9 is a bottom view of a cap portion 330 according to still another modification. The cap part 330 illustrated in FIG. 9 is configured with twelve projecting pieces 35. As described above, it is preferable that the number of protruding pieces 35 is 12 and that the sound is generated at the same time because the intensity of the generated sound can be increased.

  Further, when the uneven portion 24 cannot be formed finely because the diameter of the pedestal portion 23 is small and the number of the recessed portions 25 and the protruded portions 26 cannot be increased, the number of the protruding pieces 35 such as the cap portion 330 can be reduced. It is effective that is constructed to be large. That is, by appropriately adjusting and arranging the interval between the convex portions 26 and the interval between the protruding pieces 35, the continuity of sound generation can be ensured even if the number of the convex portions 26 is somewhat reduced.

  On the other hand, if the number of the protruding pieces 35 is too large, the gap becomes small and it is difficult to remove the protruding pieces 35 and the like from the mold during molding. In addition, although the cap part 330 is formed with a double thread 133 like the cap part 230, this may be a single thread 33.

  By the way, when the degree of meshing between the male screw 22 and the female screw 33 is larger, the protruding piece 35 is configured such that the contact surface with the protruding portion 26 is larger, or the protruding piece that fits into the recessed portion 25. The number of 35 may be further increased. By being configured in this way, it is possible to increase the intensity of the sound that is generated as the cap portion 30 approaches the fully closed state. For example, although the illustration is omitted, the lengths of the protruding pieces 35 protruding in the axial direction may be different from each other.

  The cylindrical body 20 is made of a material that can be molded so as to have an appropriate hardness, does not affect the quality of the contents, and does not have a sanitary problem even if it contacts the contents.

  As such a material, a thermoplastic resin is used for the cylindrical body 20, and more specifically, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene (homopolypropylene, block shape). Polyolefin resins such as polypropylene and random polypropylene), polyolefin resins such as copolymers of olefins and copolymerizable monomers such as vinyl monomers, acrylic monomers and unsaturated carboxylic acids, and blended compositions thereof, and A resin in which the above-described resin is blended with high-density polyethylene is used. In particular, it is preferable to use a resin in which high-density polyethylene is blended with linear low-density polyethylene from the viewpoints of heat resistance and thermal adhesiveness when the body 11 is produced as a separate body.

  In particular, the shoulder portion 12 may be laminated with a Rondel material as a barrier material in order to prevent permeation of a gas such as oxygen. Further, a film-like laminate formed into a cylindrical shape may be used for the body portion 11. The laminate may include a barrier layer, or a printing layer may be formed.

  The container main body 10 may be manufactured by bonding the cylindrical body 20 and the shoulder portion 12 which are formed in advance, and the body portion 11, or may be manufactured integrally. For forming the cylindrical body 20 and the shoulder portion 12, for example, a compression molding method can be used. For example, the container body 10 can be molded by clamping a molten resin extruded into a molding die having the shape of the container body 10 and compressing and cooling.

  The sealing structure 50 according to the present embodiment does not require a protruding portion for preventing the cap portion 30 from being unintentionally opened near the pedestal portion 23 and the shoulder portion 12 of the container body 10. Thick parts such as the protrusions are deformed by the resin unless they are uniformly cooled during compression molding, so that adjustment is required such as extending the cooling time, which is troublesome. Since the sealing structure 50 has a configuration that does not have a protruding portion, this labor is saved and the manufacturing becomes easy.

  The cap part 30 can also be molded so as to have an appropriate hardness, and is made of a material that does not affect the quality of the contents and does not affect the contents even if it comes into contact with the contents. Similarly, a thermoplastic resin is used for the cap portion 30. The cap part 30 is preferably made of polypropylene, high-density polyethylene, or the like.

  The cap part 30 is attached to the container body 10 formed in this way. Since the sealing structure 50 can be configured to reliably generate sound even if the concave and convex portion 24 in the fully closed state and the protruding piece 35 are not strictly aligned, the molding effort is reduced. The manufacturing can be made easy by omitting. Note that a sealing seal may be further attached to the spout 21 as required.

  The contents accommodated in the tube container 100 can be filled from the lower end of the trunk portion 11. The contents of the tube container 100 can be filled with toiletries such as toothpaste, cosmetics such as face-wash cream, pharmaceuticals such as ointment, foods such as glue wasabi, and the like. The lower end of the body part 11 of the tube container 100 filled with the contents is heat-sealed from the state shown in FIG. 1, and a bottom seal part (not shown) is formed to obtain a filling body.

  As described above, the sealing structure 50 according to the present embodiment includes the cylindrical body 20 that defines the spout 21 of the container body 10 and the cap portion 30 that seals the spout 21, and includes a male screw. On the outer peripheral surface of the pedestal portion 23 protruding outward in the radial direction from the cylindrical body 20 on which the 22 is formed, the concave and convex portion 24 in which the radial concave and convex portions are repeated in the circumferential direction, and the female screw 33 that meshes with the male screw 22 A protrusion configured to fit into the concave portion 25 of the concave-convex portion 24 on the outer side in the radial direction from the top cylindrical body 31 of the cap portion 30 and to climb over the convex portion 26 corresponding to the rotation of the cap portion 30 relative to the cylindrical body 20. The protruding piece 35 is configured to vibrate and generate a sound each time the protruding piece 35 gets over the protruding portion 26 and gets into the recessed portion 25. And according to the structure which concerns on this embodiment, the appropriate closure state is implement | achieved easily and reliably, and the tube container 100 using the sealing structure 50 in which the sealing structure 50 is easy to manufacture can be provided. .

  Hereinafter, the present disclosure will be described in more detail and specifically with reference to examples. However, the present disclosure is not limited to the following examples.

<Material and manufacturing method>
[Example 1]
A container body 10 having 45 convex portions 26 as shown in FIGS. 2 and 3 and a cap portion 130 having 1 projecting piece 35 as shown in FIG. 7 were prepared. The container body 10 was formed by compression molding using high-density polyethylene as a material, and the cap portion 130 was formed by injection molding using polypropylene as a material. Therefore, the sealing structure 50 according to the first embodiment fits into the concave and convex portion 24 that is repeated in the circumferential direction and the concave portion 25 of the concave and convex portion 24, and the convex portion 26 corresponds to the rotation of the cap portion 30 with respect to the container body 10. The projecting piece 35 is configured to get over the projecting piece 35, and the projecting piece 35 is configured to vibrate and generate sound each time it gets over the projecting portion 26 and gets into the recessed portion 25. Had the characteristics.

[Example 2]
The same as Example 1 except that the cap part 30 having two projecting pieces 35 as shown in FIG. 4 was used.

[Example 3]
As shown in FIG. 8, the number of projecting pieces 35 is two, and the cap portion 230 of the two female threads 133 is used. Correspondingly, the male screw 22 of the container body 10 is formed in two threads. Except that was used, it was the same as Example 1.

[Example 4]
As shown in FIG. 9, the number of projecting pieces 35 is 12, and a cap portion 330 of two female threads 133 is used. Correspondingly, the male screw 22 of the container body 10 is formed in two threads. Except that was used, it was the same as Example 1.

[Comparative Example 1]
A commercially available tube container with a general-purpose paste seasoning manufactured by Company A was used. The cap of the container of Comparative Example 1 had 1 configuration corresponding to the protruding piece 35 and 1 screw thread. And the main body of the container of the comparative example 1 had one protrusion part instead of having the uneven | corrugated | grooved part 24. FIG. Therefore, the container of Comparative Example 1 did not have the characteristics according to this embodiment.

[Comparative Example 2]
A tube container containing a food mainly made of commercially available milk manufactured by M company was used. The cap of the container of Comparative Example 2 had two components corresponding to the protruding pieces 35 and two screws. And the main body of the container of the comparative example 2 had two projection parts instead of having the uneven part 24. Therefore, the container of Comparative Example 2 also did not have the characteristics according to this embodiment.

<Evaluation method>
(Sound pressure level)
The cap of each tube container at a rotation speed of 30 rpm at a position 2 cm from the microphone of a smartphone (Sony Mobile Communications, Inc., Xperia (registered trademark) Z5 SO-01H, OS: Android (registered trademark) version 6.0) Rotated from fully open to fully closed. The electric signal converted by the microphone was analyzed by the spectrum analyzer application software Frequse See for smartphone (development: Daniel Bach), and the sound pressure level G _vn [db] was calculated.

Here, the sound pressure level G _vn is a dimensionless quantity represented as a so-called level expression in which the sound pressure P _n as a physical quantity to be measured is represented by the logarithm of the ratio with the reference quantity P ₀ . The sound pressure level G _vn can be calculated using Equation (1).

Furthermore, it was also made calculation of relative values P _{n /} P ₁ when the sound pressure P ₁ of Comparative Example 1 is 1. The relative value P _n / P ₁ can be calculated as follows based on the equation (1). That is, when the logarithm of the formula (1) is returned to a true number, the formula (2) is obtained.

Then, equation (3) representing the sound pressure _{P n} by multiplying the _{P 0} to both sides of the equation (2) is obtained.

Therefore, the sound pressure P _n of the sound pressure level G _vn, and wherein the dividing P ₁ of the sound pressure P _n Comparative Example 1 using a sound pressure level G _v1 of the sound pressure P ₁ of Comparative Example 1 as a reference It becomes as follows.

From equation (4), it can be seen how many times the sound pressure P _{n of} each example and comparative example is P ₁ of comparative example 1. Table 1 shows the sound pressure level G _vn [db] and the relative value P _n / P ₁ [−].

(Sound continuity)
It was determined whether the sound generated when the cap of each tube container was rotated from the fully open state to the fully closed state at a rotation speed of 30 rpm was a continuous sound. Table 1 shows the results of the evaluation of sound continuity in each tube container, and is indicated by ◯: continuous sound and x: single sound.

(Comprehensive evaluation)
Based on the sound pressure level and sound continuity described above, a comprehensive evaluation of each tube container was made. Table 1 shows the results of comprehensive evaluation. Comprehensive evaluation is described by (circle): favorable and x: no aptitude.

  The following points were derived from the examples described above. In any sealed structure 50 of Example 1-4, sound was generated at a sound pressure level higher than that of the container of Comparative Example 1. In particular, in the sealing structure 50 according to Example 3, sound was generated at a greater sound pressure level than in Comparative Example 2 having the same number of threads and the number of protruding pieces. Therefore, it was shown that the loudness of the generated sound can be increased in the sealing structure 50 according to the present embodiment.

  Furthermore, while the sound produced in the containers of Comparative Examples 1 and 2 was a single sound, continuous sound was generated in any of the sealed structures 50 of Example 1-4.

  From the results of the above examples, it was shown that the sealing structure 50 according to this embodiment has a louder sound and a longer sounding time, so that the generated sound is easy to hear.

  This indication can be used suitably for tube container 100 which can be crushed in order to squeeze out the contents. However, the present disclosure is not limited to the above-described embodiments. The content filled in the tube container 100 of the present disclosure is not particularly limited as long as it has fluidity, and daily necessities such as cosmetics, detergents, medicines, miscellaneous goods, foods such as beverages and seasonings, It may be an industrial article such as an adhesive or the like.

10 container body 20 cylinder 21 spout 22 male screw (first screw)
23 Pedestal part 24, 124 Concave part 25, 125 Concave part 26, 126 Convex part 30 Cap part 31 Topped cylinder 33 Female thread (second screw)
35 Projection piece 50 Sealing structure 100 Tube container (packaging container)

Claims (7)

A sealing structure including a cylindrical body that defines a spout and a cap portion that seals the spout,
An uneven portion in which the unevenness in the radial direction is repeated in the circumferential direction on the outer peripheral surface of the pedestal portion protruding outward in the radial direction from the cylindrical body on which the first screw is formed;
The cap portion formed with the second screw meshing with the first screw is fitted in the concave portion of the concavo-convex portion on the outer side in the radial direction from the crested cylindrical body, and the cap portion is rotated with respect to the cylindrical body. Correspondingly, a projecting piece configured to get over the convex portion is provided.   2. The projecting piece is configured so that a contact surface with the convex portion becomes larger when the degree of meshing between the first screw and the second screw is larger. The sealing structure according to 1. The said convex part is equally arrange | positioned in the circumferential direction on the said outer peripheral surface, and the number of the said convex parts is comprised by 30 or more and 60 or less, The Claim 1 thru | or 2 characterized by the above-mentioned. Sealing structure. The sealing structure according to any one of claims 1 to 3, wherein a pitch of the convex portions is 0.6 mm or more and 4.0 mm or less. The sealing structure according to any one of claims 1 to 4, wherein a plurality of the protruding pieces are configured. 6. The protruding piece according to claim 1, wherein the radial overlap width with the convex portion when fitted into the concave portion is 0.5 mm or less. 6. Sealing structure. A packaging container using the sealing structure according to claim 1.

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