JP2011246128A - Cap structure of container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap structure of a container which can reduce tightening torque when screwing and tightening a cap body on a spout.SOLUTION: The cap structure of the container includes the spout 3 that is attached to a spout port of the container, and the cap body 2 that is detachably attached to a spout tube 31 of the spout, and includes a tamper-evident ring part 25 at the lower end of the cap body through a coupling part 26, and an undercut part 27 at the inner periphery part of the tamper-evident ring part. The spout includes a flange part fit in the inner periphery part of the tamper-evident ring part and including a plurality of angle parts, and a detent part 29 made to abut on the undercut part, thereby regulating rotation of the tamper-evident ring part with the cap body when rotating the cap body to uncover the container.

Description

  The present invention relates to a container cap structure, and more particularly, to a container cap structure for opening a container by separating the tamper evidence ring from a cap body provided with a tamper evidence ring.

  Conventionally, a tamper evidence ring that guarantees an unopened state is attached to the lower end of the cap body, and a cap structure that is opened by separating the tamper evidence ring from the cap body has been adopted in many containers. For example, Patent Document 1 below discloses a container lid structure in which a cap (lid) that guarantees an unopened state before use is screwed to the mouth and neck of the container body.

  The lid structure of the container includes a lid main body screwed to the mouth and neck, and an annular sealing band (corresponding to a tamper evident ring) attached to the lid main body via a fragile portion, and A ratchet mechanism is provided on the inner peripheral side of the sealing band to restrict the rotation of the sealing band in the releasing direction. Furthermore, a small-diameter portion is formed on the inner periphery of the sealing band, and the outer shape of the protruding part of the mouth-and-neck part and the inner shape of the small-diameter part of the sealing band are formed. The non-circular shapes that can be fitted to each other are set. Thus, the sealing band remaining on the mouth / neck portion of the container body does not fall off during use, and the lid structure can be easily removed when the container body and the lid are separated.

  However, in the case of the container lid structure as described above, when the lid is wound around the mouth and neck, it is necessary that the small diameter portion of the inner peripheral portion of the sealing band gets over the overhanging portion of the mouth and neck. There is a problem that the tightening torque is increased.

JP 2003-341699 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a container cap structure capable of reducing the tightening torque when the cap body is wound around the spout.

  The inventors of the present application have examined the cap structure of the container in order to solve the above-mentioned conventional problems. As a result, the inventors have found that the object can be achieved by adopting the following configuration, and have completed the present invention.

  That is, the container cap structure according to the present invention includes a spout attached to the spout portion of the container and a cap body that is detachably attached to the spout tube of the spout in order to solve the above-described problems. In the cap structure of the container, a tamper evidence ring portion is provided at a lower end of the cap body via a connecting portion, and an undercut portion is provided on an inner peripheral portion of the tamper evidence ring portion, The spout is fitted around the inner periphery of the tamper-evident ring part and rotates around the center line by contacting the flange part with a plurality of corners and the undercut part. When the tamper-evident ring part is rotated together with the cap body when opening, the corner part is provided with a front part. When opening, the tamper-evidence ring part is prevented from coming off together with the cap body by contacting the undercut part, and the connecting part is broken to separate the tamper-evidence ring part from the cap body. It is characterized by making it.

  According to the above configuration, since the plurality of corner portions provided in the flange portion of the spout are in contact with the undercut portion provided in the inner peripheral portion of the tamper evidence ring portion of the cap body, the cap body When the tamper-evident ring part is opened around the center line, it is possible to restrict the tamper-evidence ring part from being detached from the dispensing cylinder of the container together with the cap body. By this restriction, the connecting portion is broken and the tamper-evidence ring portion is separated from the cap body, and the tamper-evidence ring portion can remain on the spout side in the opened state.

  Here, when winding the cap body around the spout tube of the spout, it is necessary for the undercut portion of the inner periphery of the tamper-evident ring portion to get over the flange portion. Requires torque. At this time, if the shape of the flange portion in plan view is circular, the undercut portion needs to get over the entire circumference, and a large tightening torque is required. However, since the flange according to the present invention has a structure in which a plurality of corners are provided, the tightening torque required to wind the cap main body around the extraction tube is sufficient if it exceeds the corners. Therefore, the cap structure of the container of the present invention makes it possible to easily wind the cap body around the spout as compared with the case having the circular flange portion as described above.

  Further, in the above configuration, the undercut portion is provided in a plurality in the inner peripheral portion of the tamper evidence ring portion, and is directed in a direction in which the cap body is rotated around a center line at the time of opening. Accordingly, it is preferable to include an inclined surface that gradually bulges inward and a surface that is substantially perpendicular to the direction opposite to the rotating direction. Thereby, when winding a cap main body around the extraction pipe | tube of a spout, it can make it easy for an undercut part to get over the said rotation stop part of a spout. Further, when opening the plug, the rotation of the tamper-evidence ring portion together with the cap body can be restricted by bringing the substantially vertical surface into contact with the rotation preventing portion of the spout.

  Moreover, in the said structure, it is preferable that the magnitude | size of the said corner | angular part is larger than the distance of the said adjacent undercut part. When the cap body is wound around the spout tube, the tamper-evident ring part is located when the corners of the flange part are located in the gap between the undercut parts provided on the inner periphery of the tamper-evidence ring part. May fall off. However, since the corner portion of the flange portion is larger than the gap between the plurality of undercut portions, the tamper-evident ring portion can be prevented from dropping even if the corner portion is located in the gap portion. it can.

  Moreover, in the said structure, it is preferable that the said flange part is polygonal shape in planar view.

It is a side view showing the outline of the cap structure of the container which concerns on one Embodiment of this invention. It is a center longitudinal front view which shows the said cap structure longitudinally from the center. It is a side view showing the outline of the cap main body in the said cap structure. It is explanatory drawing showing the outline of the tamper evident ring part in the said cap main body. It is a top view showing the spout in the said cap structure. It is a bottom view showing the spout. It is a graph showing the relationship between the rotation angle and torque in the cap structure of the container which concerns on Example 1, the comparative example 1, and the reference example 1. FIG. FIG. 6 is a perspective view schematically showing a cap body used in Reference Example 1.

  Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a side view showing an outline of a cap structure (hereinafter referred to as “cap structure”) of a container according to the present embodiment. FIG. 2 is a central longitudinal sectional front view showing the cap structure longitudinally cut from the center. FIG. 3 is a side view schematically showing a cap body in the cap structure. FIG. 4 is an explanatory diagram showing an outline of a tamper evident ring portion in the cap body. FIG. 5 is a top view showing a spout in the cap structure. FIG. 6 is a bottom view showing the spout.

  As shown in FIG. 1, the cap structure 1 includes a spout 3 and a cap body 2 that is detachably attached to the spout 3. The cap structure 1 according to the present embodiment is attached to a spout part of a container, and the container is not particularly limited, and examples thereof include a packaging container.

  As shown in FIGS. 2 and 3, the cap body 2 is constituted by a cylindrical body whose upper surface 21 is closed and whose lower portion is opened. A spiral female screw 22 is formed on the inner surface, and is configured to be able to be screwed into a male screw portion 32 in a spout 3 described later. In addition, an annular seal body 23 protrudes downward on the inner side surface of the upper surface 21 of the cap body 2 radially inward from the inner wall surface. When the cap body 2 is screwed into the spout 3, the seal body 23 brings its outer peripheral surface into close contact with the inner surface of the dispensing cylinder 31. Thereby, it can prevent that the contents in a container leak. Further, as shown in FIG. 3, a knurled 28 having an anti-slip function is provided on the outer peripheral surface of the cap body 2. Thereby, when the cap main body 2 is wound around the extraction cylinder 31 of the spout 3, the cap main body and the rotating portion of the capper for tightening the cap main body can be fitted, and the tightening is easily performed. be able to. Further, the cap body 2 can be easily opened.

  At the lower part of the cap body 2, a contact preventing part 24 formed by projecting the lower part outward in the radial direction is provided. The outer surface 24a of the contact preventing portion 24 damages the connecting portion 26, for example, when the cap body 2 is pressed against the tamper evidence ring portion 25 when the cap body 2 is transported or put into the production line. It is to avoid giving.

  The tamper evident ring portion 25 is formed in an annular shape and is disposed below the contact prevention portion 24. Further, four connecting portions 26 for connecting the tamper-evidence ring portion 25 are provided at equal intervals on the lower portion of the cap body 2. However, it is sufficient that at least two connecting portions 26 are provided. The connecting portion 26 is preferably formed thin so that the cap body 2 can be broken when the cap body 2 is opened. Moreover, it is preferable that the connection part 26 after a fracture | rupture is the state connected with the cap main body 2 side (the reason is mentioned later). Therefore, it is preferable that the thin portion of the connecting portion 26 is on the tamper evidence ring portion 25 side.

  As shown in FIGS. 4A and 4B, the tamper evident ring portion 25 is provided with a groove portion 25 a at a connection portion with the connecting portion 26. Further, the tamper evident ring portion 25 is provided with a groove portion 25b for performing an image inspection at a cap winding stop position. By providing the groove 25b, it is possible to detect a product with insufficient cap winding.

  A plurality of undercut portions 27 are provided on the lower side of the inner peripheral surface of the tamper evident ring portion 25. Further, the undercut portion 27 has an inclined surface 27a that gradually bulges inwardly in the direction in which the cap body 2 is rotated around the center line (the opening direction in FIG. 4A), and the direction in which the undercut portion 27 rotates. The surface 27b is substantially perpendicular to the opposite direction. With such a shape, when the cap body 2 is wound around the spout tube 31 of the spout 3, it is easy for the undercut portion 27 to get over the first flange portion 33 described later, and the tightening torque is reduced. Can be achieved. It is preferable that the tamper-evidence ring portion 25 when the cap body 2 is wound and closed on the spout cylinder 31 of the spout 3 is positioned between the first flange portion and the second flange portion. Between the 1st flange part 33 and the 2nd flange part 34, the rotation prevention part 29 for restrict | limiting that the tamper evidence ring part 25 rotates with a cap body 2 more than fixed is provided in columnar shape. As a result, when the cap body 2 is rotated in the direction of opening around the center line to open the cap body, the anti-rotation portion 29 and the substantially vertical surface 27b of the undercut portion 27 come into contact with each other, and the tamper evidence The ring portion 25 can be prevented from further rotating together with the cap body 2. The first flange portion restricts the tamper evidence ring portion 25 from moving upward. As a result, the connecting portion 26 is broken, and the tamper evident ring portion 25 is separated from the cap body 2.

  Moreover, if the tamper evident ring part 25 is provided with a softness | flexibility, when winding the cap main body 2 around the extraction pipe | tube 31, it can deform | transform easily into the shape along the shape of a flange part. As a result, the undercut portion 27 can easily get over the first flange portion, and the tightening torque can be reduced. The thickness d of the tamper-evident ring part 25 is preferably in the range of 0.5 to 2 mm, more preferably in the range of 0.8 to 1.5 mm (see FIG. 4C). By setting the d to 0.5 mm or more, the mechanical strength and moldability of the tamper-evidence ring portion 25 can be favorably maintained. On the other hand, when d is 2 mm or less, it is possible to suppress the winding torque from becoming too large.

  The distance between the adjacent undercut portions 27 (that is, the distance of the inner peripheral surface of the tamper-evidence ring portion 25 where the undercut portion is not provided) may be smaller than the corner portion of the first flange portion. preferable. Thereby, even if the corner | angular part of a 1st flange part is located in the part of a gap | interval, the drop-off | omission of the tamper evident ring part 25 can be prevented. The distance between the gaps between the adjacent undercut portions 27 is not particularly limited, and may be set as necessary depending on the size of the cap body 2 and the tamper evidence ring portion 25 and the like. Further, the maximum width of the undercut portion 27 (the maximum width of the portion that bulges from the inner peripheral surface of the tamper evident ring portion 25, more specifically, the width at the portion of the substantially vertical surface 27b) is appropriately set. Although it can set as needed, Preferably it is 0.2 mm-1.5 mm, More preferably, it is 0.3 mm-1 mm. By setting the maximum width of the undercut portion 27 to 0.2 mm or more, an area where the rotation preventing portion 29 and the substantially vertical surface 27b of the undercut portion 27 come into contact with each other is secured, and the tamper evidence ring portion 25 is provided. It can be prevented that the further rotation with the cap body 2 is restricted. On the other hand, by setting the maximum width of the undercut portion 27 to 1.5 mm or less, it is possible to prevent the winding torque from becoming too large.

  As for the spout 3, for example, as shown in FIG. The male screw portion 32 is screwed with the female screw portion 22 provided on the inner peripheral surface of the cap body 2. Further, as shown in FIG. 5, the spout 3 is provided with a first flange portion 33 that fits in the inner peripheral portion of the tamper evidence ring portion 25 and includes a plurality of corner portions 33a. Here, when the cap body 2 is wound around the spout cylinder 31 of the spout 3, the undercut portion 27 in the inner peripheral portion of the tamper-evident ring portion 25 needs to get over the first flange portion 33. . Therefore, if the flange portion is circular in plan view, it is necessary for the undercut portion to ride over the entire circumference, and a large winding torque is required. However, in the present embodiment, since the shape of the first flange portion 33 in a plan view is a regular hexagonal shape having a plurality of corner portions 33a, the undercut portion 27 winds up only when the corner portion 33a is overcome. Tightening is possible. Therefore, when the shape is the above, it is possible to reduce the winding torque as compared with the case where the first flange portion is circular. The size of the corner 33a is preferably larger than the distance between the gaps between the adjacent undercut portions 27. The size of the corner portion 33a is not particularly limited, and can be set as necessary depending on the distance between the gaps between the adjacent undercut portions 27, the size of the spout, and the like.

  In the present invention, the first flange portion 33 is not particularly limited as long as it has a shape provided with a plurality of corner portions 33a, but is preferably a regular polygonal shape such as a regular hexagon. Further, the corner 33a may be curved as shown in FIG.

  Further, the distance between the first flange portion 33 and the second flange portion 34 is not particularly limited as long as it is at least about the height of the tamper evidence ring portion 25. Thereby, when the cap main body 2 is closing the spout, the 1st flange part 33 can be accommodated in the inside of the tamper evident ring part 25. FIG. Further, below the second flange portion 34, a third flange portion 37 is provided as a locking means for hanging and conveying the spout 3 after manufacture. In addition, the 2nd flange part 34 may also be used as a latching means for hanging and conveying the spout 3 after manufacture.

  Moreover, as shown in FIG. 6, the spout 3 is provided with the joint surface 35 which enables joining with a container main body on the both sides | surfaces of the base part 36 continued to the extraction | pouring cylinder 31. As shown in FIG. In the joint surface 35, both end portions of both side surfaces are formed to project at an acute angle. Furthermore, the both surface parts of the center part which continues to this are comprised by the arc-shaped surface, and can be attached | attached to the back surface of a packaging container (not shown) in the close_contact | adhering state. The joining method with the packaging container in the joining surface 35 is not specifically limited, For example, it can adhere | attach or weld.

  In addition, it does not specifically limit as a constituent material of the said cap main body 2, For example, polyethylene, a polypropylene, etc. are mentioned. Moreover, it does not specifically limit as a constituent material of the said spout 3, For example, polyethylene, a polypropylene, etc. are mentioned. Furthermore, it does not specifically limit as a manufacturing method of the cap main body 2 and the spout 3, A well-known method, such as injection molding, is employable.

  Hereinafter, preferred embodiments of the present invention will be described in detail by way of example. However, the present invention is not limited to this example.

Example 1
In the present embodiment, using the container cap structure shown in FIGS. 1 to 6 described above, the tightening torque when winding the cap body around the spout tube of the spout, and the torque when opening the cap body are set. It was measured. The measurement was performed at a rotation angle of the cap body every 45 degrees, and when the rotation angle reached 360 degrees and the torque reached 40 cNm, the winding was finished. In addition, a torque meter (trade name: 3TM75CN) manufactured by TOHNICHI Co., Ltd. was used for measuring the torque. The results are shown in Table 1 below and FIG.

(Comparative Example 1)
In this comparative example 1, the winding when the cap main body is wound around the spout pipe of the spout in the same manner as in example 1 except that a spout having a circular shape in plan view of the flange portion is used. The tightening torque and the torque when opening the cap body were measured. The results are shown in Table 1 below and FIG.

(Reference Example 1)
In Reference 1, except that the cap body is changed to the cap body shown in FIG. 8, the tightening torque and the cap body when the cap body is wound onto the spout tube of the spout are the same as in Comparative Example 1. Torque when opening was measured.

  As shown in FIG. 8, the cap body used in the first reference example has a band 82 that is divided into two arc-shaped portions 82a and 82b instead of the tamper-evident ring portion in the first embodiment. The arc-shaped portions 82a and 82b are respectively connected to the cap body 81 by the first connecting portion 83, and the connecting portions have a structure that does not break even after the cap body is opened. Further, the front end portion 84 of the arc-shaped portion 82a and the rear end portion 85 of the arc-shaped portion 82b are connected by the second connecting portion 86 before opening, but are broken after opening. Also, after opening the cap body, the band 82 does not remain on the spout side. Remove from the spout with the cap body. The results when the cap body 81 is used are shown in Table 1 below and FIG.

(result)
As can be seen from Table 1 and FIG. 7 below, when the flange portion has a circular cap structure as in Comparative Example 1, the tightening torque when the cap body is wound around the spout tube of the spout showed a large value. . On the other hand, it was confirmed that when the flange portion has a regular hexagonal cap structure as in Example 1, the tightening torque can be reduced and the cap body can be easily tightened.

DESCRIPTION OF SYMBOLS 1 Cap structure 2 Cap main body 3 Spout 21 Upper surface 22 Female thread part 23 Sealing body 24 Contact prevention part 24a Outer surface 25 Tamper evident ring part 25a Groove part 25b Groove part 25c Upper surface 26 Connection part 27 Undercut part 27a Inclined surface 27b Substantially vertical surface 28 Knurl 29 Anti-rotation part 31 Outlet tube 32 Male thread part 33 First flange part 33a Corner part 34 Second flange part 35 Joint surface 36 Base part 37 Third flange part 81 Cap body 82 Band 82a Arc-shaped part 82b Arc-shaped part 83 Connecting part 84 Front end 85 Back end 86 Connection

Claims (4)

A cap structure of a container comprising a spout attached to a spout part of the container, and a cap body detachably attached to the spout tube of the spout,
A tamper evidence ring part is provided at the lower end of the cap body via a connecting part,
An undercut portion is provided on the inner periphery of the tamper-evident ring portion,
The spout includes
A flange portion that fits in an inner peripheral portion of the tamper-evident ring portion and includes a plurality of corner portions;
By contacting the undercut portion, a rotation preventing portion is provided that restricts the tamper evidence ring portion from rotating together with the cap body when the cap body is rotated around a center line to be opened. And
The corner portion is in contact with the undercut portion at the time of opening, thereby restricting the tamper evidence ring portion from being detached together with the cap body, and breaking the connecting portion to thereby cut the tamper evidence ring. Cap structure for a container that separates the part from the cap body. A plurality of the undercut portions are provided on the inner peripheral portion of the tamper evidence ring portion,
And an inclined surface that gradually bulges inwardly in a direction in which the cap main body is rotated around a center line at the time of opening, and a surface that is substantially perpendicular to the direction opposite to the rotation direction. The container cap structure described in 1.   The container cap structure according to claim 2, wherein a size of the corner portion is larger than a distance between adjacent undercut portions.   The container cap structure according to claim 1, wherein the flange portion has a polygonal shape in a plan view.