JP4234834B2 - Paper container cap structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cap structure in a paper container such as a beverage, and more particularly to a cap structure of a paper container having a function of opening the aseptically filled paper container body.
[0002]
[Prior art]
Conventionally, as this type of cap structure, those described in Japanese Patent Application Laid-Open No. 7-277324 and those described in Japanese Patent Application No. 7-507594 are known.
[0003]
In the former publication, as shown in FIG. 4, a lid plate 13 is attached to the upper portion of the paper container body 11 by a hinge 12 so as to be freely opened and closed, and is sealed when the lid plate 13 is first opened. The end portion 14A of the seal 14 can be peeled off. Further, at the time of resealing, the lid plate 13 is closed by being fitted to the lid receiving flange 15.
[0004]
In the latter publication, as shown in FIG. 5, an opening ring 23 is fitted to the inner periphery of the cap base 22 attached to the upper surface of the paper container main body 21, and the outer periphery of the cap base 22 is attached. A cap 24 is fitted, and the opening portion 21 a of the paper container main body 21 is opened by the circumferential blade 23 a at the lower end of the ring 23 by the rotation of the opening ring 23.
[0005]
[Problems to be solved by the invention]
By the way, in the structure shown in FIG. 4, after the cover plate 13 is first opened, a part of the sealing seal 14 is automatically peeled off, and then the seal is further peeled off by hand. In many cases, it does not peel off well, and it is necessary to peel off the seal by hand. Also, resealability was not good.
[0006]
Further, the structure shown in FIG. 5 can be easily opened by a single operation and has good resealability. However, the structure is complicated, and the hygienic aspect and the There was a safety problem.
[0007]
In consideration of the above circumstances, the present invention can open the paper container body only by a simple cap rotation operation, has a simple structure, good resealability, and has a safe and hygienic opening function. An object of the present invention is to provide a paper container cap structure.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, a cap base having a cylindrical mouth is fixed to the outer surface of the paper container main body so as to surround the planned opening of the paper container main body, and the screw base is provided so as to cover the mouth of the cap base. A paper container cap structure in which a cap of the type is attached and the mouth is opened by turning the cap in the opening direction and closed by turning in the closing direction. A cylindrical retainer is screwed around the inner periphery of the retainer by a first screw portion, and an unsealing shaft portion protruding from the inner surface of the cap is screwed by a second screw portion on the inner periphery of the retainer. The threaded portion raises the retainer relative to the cap base by rotating the retainer relative to the cap base in the direction of opening, and also supports the retainer by rotating the retainer relative to the cap base in the direction of closing. The screw direction is set so as to be lowered with respect to the base, and the second screw portion lowers the cap with respect to the retainer by turning the cap in the opening direction with respect to the retainer, and with respect to the retainer. The screw direction is set so that the cap is raised with respect to the retainer by turning the cap in the closing direction, and the opening opening portion is opened on the cap by lowering the opening shaft portion protruding from the cap. In the meantime, the retainer is fixed to the cap base side to invalidate the relative rotation of the first threaded portion, and after the planned opening portion is opened, the retainer is fixed to the cap side to A stopper for invalidating the relative rotation of the second screw portion is provided.
[0009]
Here, the material of the paper container body includes not only paper itself but also a sheet-like material similar to paper.
[0010]
In this structure, when the cap is turned in the opening direction at the first stage before opening, the relative rotation of the cap base and the screw fitting portion (first screw portion) of the retainer is invalidated by the stopper means. Is fixed to the cap base side, the cap is rotated with respect to the retainer, the cap is lowered by the lead action of the second screw portion, and the opening shaft portion provided on the cap is moved to the paper container main body. Push the planned opening part inside to open it.
[0011]
Next, when the cap is continuously rotated in the direction of opening, the cap and the retainer reach the screwing limit, thereby rotating together. Since this stage is after the opening, the first screw portion is released so as to be able to rotate relative thereto, and the relative rotation of the second screw portion is invalidated. When the cap and the retainer rotate together in the opening direction, the retainer rises from the cap base, the cap and the retainer are detached from the cap base, and the opening of the cap base is opened.
[0012]
Once opened, the retainer is fixed to the cap side by the action of the stopper means. When closing the cap, turn the cap in the closing direction to turn the first screw like a normal cap. The cap integral with the retainer can be lowered by the action of the portion, and the mouth portion of the cap base can be closed.
[0013]
The invention of claim 2 is the paper container cap structure according to claim 1, wherein the stopper comprises a locking projection provided on the inner surface of the peripheral wall of the cap. An inclined surface that presses the upper end of the retainer against the cap base side when lowered and invalidates the relative rotation of the first screw part, and the second screw part by locking the upper end of the retainer when the cap is lowered after opening And a locking wall that invalidates the relative rotation of the first and second rotations.
[0014]
In this structure, when the cap is turned in the opening direction at the first stage before opening, the relative rotation of the cap base and the screw fitting portion (first screw portion) of the retainer is prevented by the engaging protrusion as a stopper. Since the relative rotation is allowed only in the second screw part, the cap descends with respect to the retainer. At this time, the inclined surface of the engaging projection provided on the inner periphery of the cap strongly presses the upper end of the retainer against the cap base as the cap is lowered, thereby preventing the retainer from rotating. Then, when the cap is lowered by the lead action of the second screw portion, the unsealing shaft portion provided on the cap pushes the planned opening portion of the paper container body into the opening and opens it.
[0015]
Next, when the cap is continuously rotated in the opening direction, the cap and the retainer come to rotate together by reaching the screwing limit. When the cap and the retainer rotate together in the opening direction, the retainer rises from the cap base, the cap and the retainer are detached from the cap base, and the opening of the cap base is opened.
[0016]
To close the cap from this state, turn the cap in the closing direction. Then, if the retainer can rotate relative to the cap, the retainer may only be lowered with respect to the cap (or the cap only rises with respect to the retainer). Since the upper end of the retainer is locked to the cap by the locking wall, the retainer does not descend with respect to the cap and is held on the cap side. The retainer and the cap rotate together, and the first screw The cap integrated with the retainer is lowered by the action of the part, and closes the mouth of the cap base.
[0017]
The invention of claim 3 is the paper container cap structure according to claim 1 or 2, wherein an inner plug made of a harder material than the paper container main body is fixed to the outer surface of the planned opening portion. On the other hand, the unsealing shaft portion is rotatably coupled via a pivot.
[0018]
In this structure, when opening, the inner plug made of a hard material pushes the opening planned portion to open, so that the opening is performed reliably and cleanly. Further, since the inner plug is affixed to the planned opening portion and is removed together with the cap at the time of opening the plug, the remaining parts are removed from the outlet of the contents, so that the contents can be easily discharged and hygienic.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
1 to 3 are sectional views of the cap structure of the embodiment, FIG. 1 is a view showing a state before the paper container body is opened, and FIG. 2 is a state where the paper container body is opened by the opening shaft portion of the cap. FIG. 3 is a view showing a state where the cap is turned as it is to open the cap after opening.
[0021]
This cap structure is mainly composed of four resin parts, that is, a cap base 61, a retainer 62, a cap 63, and an inner plug 65. These parts are naturally harder than the composite paper box-shaped paper container body 51. A circular opening planned portion 53 surrounded by perforations (perforations or cut lines) 52 is formed on the upper surface of the paper container body 51.
[0022]
The cap base 61 is a cylindrical part having a mouth portion 61a, and is bonded to the outer surface of the paper container main body 61 on the bottom surface so as to concentrically surround the planned opening portion 53, and on the outer surface of the planned opening portion 53 is a disc shape. The inner plug 65 is adhered. Note that the inner plug 65 may be formed integrally with the cap base 61 via the separation weak portion 65a.
[0023]
A cylindrical screw is formed on the inner peripheral upper portion of the mouth portion 61a of the cap base 61 via a right screw 71 (consisting of a right female screw on the cap base 61 side and a right male screw on the retainer 62 side) as a first screw portion. The retainer 62 is screwed. The retainer 62 is screwed in until the upper end flange 62 a contacts the upper end of the mouth portion 61 a of the cap base 61, and the outer periphery of the flange 62 a protrudes outward from the outer periphery of the mouth portion 61 a of the cap base 61.
[0024]
On the inner periphery of the retainer 62, a left screw 72 (consisting of a left female screw on the retainer 62 side and a left male screw on the cap 63 side) as a second screw portion is formed on the inner surface of the top plate 63b of the cap 63. The projecting opening shaft 64 is screwed. The unsealing shaft portion 64 pushes down the planned opening portion 53 through the inner plug 65 to punch out the planned opening portion 53 along the perforation 52, and forms an opening through the pivot 69 at the lower end. And are freely coupled.
[0025]
Here, since the opening direction of the cap 63 is set in the counterclockwise direction, the right screw 71 as the first screw portion turns the retainer 62 relative to the cap base 61 in the opening direction (counterclockwise) The retainer 62 is raised with respect to the cap base 61. Further, the retainer 62 is lowered with respect to the cap base 61 by turning the retainer 62 in the closing direction (clockwise) with respect to the cap base 61. On the other hand, the left screw 72 as the second screw portion lowers the cap 63 relative to the retainer 62 by turning the cap 63 relative to the retainer 62 in the opening direction (counterclockwise). Further, the cap 63 is raised relative to the retainer 62 by turning the cap 63 in the closing direction (clockwise) with respect to the retainer 62.
[0026]
On the inner periphery of the peripheral wall 63a of the cap 63, a locking projection 68 as a stopper means is provided. The locking protrusion 68 has an inclined surface 68a on its lower surface side that presses the upper end flange 62a of the retainer 62 against the cap base 61 side when the cap 63 before opening is lowered and invalidates the relative rotation of the right screw 71. On the upper surface side, there is a locking wall 68b that disables the relative rotation of the left screw 72 by locking the upper end flange 62a of the retainer 62 when the cap 63 after opening is lowered.
[0027]
Next, the operation will be described.
[0028]
Opening is performed by turning the cap 63 counterclockwise. That is, when the cap 63 is turned counterclockwise in the first stage before opening, the inclined surface 68a of the engaging projection 68 provided on the inner periphery of the cap 63 caps the upper end flange 62a of the retainer 62 as shown in FIG. Since the retainer 62 is pressed against the base 61 side, the retainer 62 is prevented from rotating (the relative rotation of the right screw 71 is invalidated and the retainer 62 is held in a state where it cannot be lifted). Descend. Then, as shown in FIG. 2, the opening shaft portion 64 of the cap 63 pushes the planned opening portion 53 of the paper container body 51 into the opening, thereby opening the planned opening portion 53 along the perforation 52.
[0029]
If the cap 63 is continuously rotated counterclockwise, the cap 63 and the retainer 62 rotate together by reaching the screwing limit of the left screw 72. At this time, the upper end flange 62a of the retainer 62 gets over the inclined surface 68a of the locking projection 68 and fits between the locking wall 68b and the top plate 63a, thereby pressing the retainer 62 against the cap base 61 side. Power is released. That is, the effect of invalidating the relative rotation of the right screw 71 as the first screw portion is eliminated. At the same time, the retainer 62 is fixed to the cap 63 side, so that the relative rotation of the left screw 72 as the second screw portion is invalidated.
[0030]
Then, as the cap 63 and the retainer 62 rotate together in the opening direction (left direction), as shown in FIG. 3, the retainer 62 rises from the cap base 61, and finally the cap 63 and the retainer 62 are caps. The cap 61 is detached from the base and the mouth 61a of the cap base 61 is opened.
[0031]
When closing the cap 63 from this state, the cap 63 is rotated to the right (in the closing direction). Then, if the retainer 62 can rotate relative to the cap 63, the cap 63 may only rise relative to the retainer 62. However, the upper end flange 62a of the retainer 62 may be Since the cap 63 is locked to the retainer 62, the cap 63 does not rise up and is held on the cap 63 side. The retainer 62 and the cap 63 are integrally rotated to the right, and the right screw 71 As a result, the cap 63 integral with the retainer 62 is lowered, and the opening 61a of the cap base 61 is closed by the flange 62a of the retainer 62.
[0032]
Therefore, by simply turning the cap 63 counterclockwise, the paper container main body 51 can be automatically opened in the first stage, and the cap 63 can be opened in the next stage. It can be closed just like the screw type cap. For this reason, it can be opened easily, reliably and hygienically. Moreover, since it can be resealed normally by screwing in a cap, resealability is also good. In addition, since the direction of the screw inside and outside the retainer is set to be reversed and the opening shaft portion 64 and the engaging projection 68 are provided in the cap, the structure can be simple and can be implemented at low cost. Further, since a blade for opening is not necessary, the safety at the time of dismantling for recycling is also increased.
[0033]
Further, the opening is performed by the hard inner plug 65, and the planned opening 53 after the opening is removed together with the inner plug 65, so that it is possible to perform a reliable and clean opening, and there is a residual part at the outlet of the contents. It will not be left, it becomes easier to discharge the contents, and the hygiene can be improved.
[0034]
The right screw 71 and the left screw 72 in the above embodiment may be set in reverse. That is, the cap base 61 and the retainer 62 may be screwed together with a left screw, and the retainer 62 and the opening shaft part 64 of the cap 63 may be screwed together with a right screw. In this case, however, the opening direction is clockwise and the closing direction is counterclockwise.
[0035]
【The invention's effect】
As described above, according to the first aspect of the present invention, the paper container body can be opened simply, reliably, and hygienically by only a simple cap rotation operation in the same direction. In addition, since it is resealed by screwing in the cap, the resealability is also good. Since the direction of the screw inside and outside the retainer is reversed and a stopper is provided on the cap, the structure is simple and easy to implement. It is. In addition, since a blade for opening is not necessary, safety at the time of dismantling for recycling can be improved.
[0036]
According to the invention of claim 2, the stopper can be formed simply by providing the locking projection on the inner periphery of the cap, so that the structure can be simplified.
[0037]
According to the third aspect of the present invention, the planned opening portion is opened with a hard inner plug, and the planned opening portion after opening is detached together with the inner plug, so that reliable and clean opening can be performed. . In addition, since no remaining parts remain at the content outlet, the contents can be easily discharged and further hygienic.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a cap structure according to an embodiment of the present invention, showing a state before opening a paper container body.
FIG. 2 is a cross-sectional view of a cap structure according to an embodiment of the present invention, showing a state where a paper container body is opened by an opening shaft portion of the cap.
FIG. 3 is a cross-sectional view of a cap structure according to an embodiment of the present invention, and shows a state where the cap is being opened by opening the cap as it is after being opened;
FIG. 4 is a diagram showing an example of a conventional cap structure.
FIG. 5 is a view showing another example of a conventional cap structure.
[Explanation of symbols]
51 Paper container body 52 Perforation 52
53 scheduled opening 61 cap base 61a mouth 62 retainer 62a upper end flange 63 cap 63a peripheral wall 64 opening shaft 65 inner plug 68 locking projection (stopper means)
68a Inclined surface 68b Locking wall 69 Pivot 71 Right-hand thread (first thread portion)
72 Left-hand thread (second thread)

Claims (3)

A cap base having a cylindrical mouth portion is fixed to the outer surface of the paper container body so as to surround the planned opening portion of the paper container body, and a screw-type cap is attached so as to cover the mouth portion of the cap base. In the cap structure of the paper container that is designed to open the mouth by turning the cap in the opening direction and to close the mouth by turning in the closing direction,
A cylindrical retainer is screwed to the inner periphery of the cap base mouth by a first screw portion, and an opening shaft portion projecting from the inner surface of the cap is formed by the second screw portion on the inner periphery of the retainer. Screwed,
The first screw part raises the retainer relative to the cap base by rotating the retainer relative to the cap base in the opening direction, and turns the retainer toward the cap base by rotating the retainer relative to the cap base in the closing direction. The screw direction is set so as to lower
The second threaded portion lowers the cap relative to the retainer by rotating the cap relative to the retainer in the opening direction, and raises the cap relative to the retainer by rotating the cap relative to the retainer in the closing direction. So that its screw direction is set,
Furthermore, the retainer is fixed to the cap base side until the planned opening portion is opened by the lowering of the opening shaft portion projecting from the cap, and the relative rotation of the first screw portion is disabled. And a stopper for fixing the retainer on the cap side and disabling relative rotation of the second screw portion after the planned opening portion is opened. Construction. The paper container cap structure according to claim 1,
The stopper includes a locking protrusion provided on the inner surface of the peripheral wall of the cap, and the upper end of the retainer is pressed against the cap base when the cap is lowered before opening, and the first screw portion is relatively rotated. And an engaging wall for disabling relative rotation of the second threaded portion by engaging the upper end of the retainer when the cap is lowered after opening. Paper container cap structure. A paper container cap structure according to claim 1 or 2,
An inner stopper made of a material harder than the paper container main body is fixed to the outer surface of the planned opening portion, and the opening shaft portion is rotatably coupled to the inner stopper via a pivot. Cap structure of paper container.

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