JP2023156938A - Fitting structure - Google Patents

Abstract

To provide a fitting structure capable of preventing the rotation of an inner plug with respect to a container body and reducing force required for capping/fitting the inner plug.SOLUTION: A fitting structure comprises a container body, and an inner plug having a top surface part and an annular fitting part. The mouth of the container body has a first annular part constituting an open end, a second annular part which is connected to the first annular part and has an outer diameter smaller than that of the first annular part, and a plurality of first ribs disposed on an outer peripheral surface of the second annular part. The fitting part of the inner plug has a third annular part which is connected to an outer peripheral edge of the top surface part and has an inner diameter equal to or larger than that of the first annular part, a fourth annular part which is connected to the third annular part, has an inner diameter equal to that of the third annular part, and constitutes an open end of the fitting part, and a plurality of second ribs which is disposed on an inner peripheral surface of the fourth annular part. In a state where the inner plug is fitted to the mouth, the first annular part and the second annular part are housed inside the third annular part and the fourth annular part, respectively, and the first rib and the second rib are fitted to each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a fitting structure that includes a container body and an inner stopper that seals the mouth of the container body.

Various packaging containers have been proposed that include an inner stopper and a cap that seal the container body, and the inner stopper can be opened by rotating the cap. For example, Patent Document 1 discloses that the intended opening part of the inner stopper and the cap are screwed together, and by rotating the overcap in the opening direction, the threaded engagement between the intended opening part and the cap is advanced, and the inner stopper is opened. A packaging container is described in which the intended opening can be cut out.

In the above packaging container, since a part of the inner stopper is cut off by rotating the cap, it is preferable that the container body and the inner stopper are provided with a rotation prevention structure so that the inner stopper does not rotate with the rotation of the cap. .

FIGS. 7 and 8 are longitudinal sectional views showing an example of a conventional fitting structure between an inner stopper and a container body.

The packaging container 91 shown in FIG. 7 includes a container body 92, an inner stopper 93 that seals the opening of the container main body 92, and a cap 94 that is screwed into the container body 92 and engaged with the inner stopper 93. . By rotating the cap 94, a portion of the partition wall 100 of the inner stopper 93 surrounded by the fragile portion 99 can be cut out, and the packaging container 91 can be opened. A container body 92 shown in FIG. 7 has a flange portion 95 at the open end portion of the mouth portion. The inner stopper 93 is provided with an undercut portion 96, and the inner stopper 93 is attached to the container main body 92 by fitting the flange portion 95 of the container body 92 into the undercut portion 96. The undercut portion 96 has an annular portion 97 for accommodating the flange portion 95 and an annular portion 98 having an inner diameter smaller than the annular portion 97. A rotation prevention structure consisting of, for example, ribs competing with each other is provided in the circled portion of the container body 92 and the inner stopper 93 to prevent the inner stopper 93 from rotating when the cap 94 is rotated.

In addition, the packaging container 91' shown in FIG. 8 includes a container body 92', an inner stopper 93' that seals the opening of the container main body 92', and a container body 92' that is screwed together with the inner stopper 93'. and an engaging cap 94. By rotating the cap 94, a portion of the partition wall 100 of the inner stopper 93' surrounded by the fragile portion 99 can be cut out, and the packaging container 91' can be opened. The container body 92' shown in FIG. 8 has a flange portion 101 at the open end portion of the mouth portion. The inner stopper 93' is provided with an undercut part 102, and the flange part 101 of the container main body 92' fits into the undercut part 102, so that the inner stopper 93' is attached to the container main body 92'. . The undercut portion 102 includes an annular portion 103 that accommodates the flange portion 101 and an annular portion 104 having an inner diameter smaller than the annular portion 103. A rotation prevention structure consisting of, for example, ribs competing with each other is provided in the circled portions of the container body 92' and the inner stopper 93', and prevents the inner stopper 93' from rotating when the cap 94 is rotated. ing.

International Publication No. 2007/126062

In the inner stopper 93 shown in FIG. 7, a rib for preventing rotation is provided within the undercut portion 96. In the case of this configuration, the shape of the rib is likely to collapse due to forced removal of the undercut portion 96 during molding, and the anti-rotation function is likely to deteriorate. Further, since the undercut portion 96 has the annular portion 98, the force required for fitting the inner stopper 93 into the container body 92 increases.

In the inner stopper 93' shown in FIG. 8, the undercut portion 102 is forcibly removed during molding, so that the ribs for preventing rotation have a widened shape. Therefore, there is a problem that the ribs of the inner stopper 93' and the ribs of the container body 92' are not sufficiently engaged with each other, and the container is likely to spin idly. Also, in the inner stopper 93' of FIG. 8, since there is an annular portion 104 constituting the undercut portion 102, the force required for plugging and fitting becomes large.

Therefore, an object of the present invention is to provide a fitting structure that can prevent the inner stopper from rotating relative to the container body and reduce the force required to plug and fit the inner stopper.

A fitting structure according to the present invention includes a container body having a cylindrical opening, a top surface, and an annular fitting section connected to the outer peripheral edge of the top surface, and the fitting section is connected to the opening. and an inner stopper that fits into the open end portion of the container to close the mouth. The mouth of the container body includes a first annular part constituting an open end of the mouth, and a second annular part connected to the first annular part and having an outer diameter smaller than the outer diameter of the first annular part. and a plurality of first ribs provided on the outer peripheral surface of the second annular portion and extending in a direction parallel to the central axis of the mouth portion. The fitting part of the inner stopper is connected to the outer peripheral edge of the top part and has an inner diameter equal to or larger than the first annular part, and a third annular part that is connected to the third annular part and has an inner diameter equal to the third annular part. a fourth annular portion having an inner diameter and constituting the open end of the fitting portion; and a plurality of second annular portions provided on the inner circumferential surface of the fourth annular portion and extending in a direction parallel to the central axis of the inner plug. It has ribs. The height of the second rib in the radial direction of the fourth annular part is greater than the difference between the inner diameter of the third annular part and the outer diameter of the first annular part, so that the inner stopper fits into the mouth of the container body. In the assembled state, the first annular part and the second annular part are housed inside the third annular part and the fourth annular part, respectively, and the grooves between the adjacent first ribs accommodate the first annular part and the second annular part. The second rib fits.

According to the present invention, it is possible to provide a fitting structure that can prevent rotation of the inner stopper with respect to the container body and reduce the force required to plug and fit the inner stopper.

Vertical cross-sectional view of a packaging container according to an embodiment Front view of the mouth of the container body shown in Figure 1 End view seen from the III-III line shown in Figure 2 Longitudinal cross-sectional view of the inner stopper shown in Figure 1 Enlarged end view of the “V” part shown in Figure 4 Back view of the inner stopper shown in Figure 1 A vertical cross-sectional view showing an example of a conventional fitting structure between an inner stopper and a container body. A vertical cross-sectional view showing another example of the conventional fitting structure between the inner stopper and the container body.

FIG. 1 is a longitudinal cross-sectional view of a packaging container according to an embodiment.

The packaging container 1 includes a container main body 2 having a cylindrical opening 8, an inner stopper 3 that seals the opening 8 of the container main body 2, and an inner stopper 3 that is screwed into the opening 8 of the container main body 2. and a cap 4 that engages with. By rotating the cap 4, a portion of the top surface portion 12 of the inner stopper 3 surrounded by the fragile portion 13 can be cut off, and the packaging container 1 can be opened. The circled portions of the container body 2 and the inner stopper 3 are provided with a rotation prevention structure consisting of, for example, ribs or knurls that compete with each other, and prevent the inner stopper 3 from rotating when the cap 4 is rotated. There is.

2 is a front view of the opening of the container body shown in FIG. 1, and FIG. 3 is an end view taken from the line III--III shown in FIG. 2.

The container body 2 is not particularly limited as long as it has a cylindrical opening 8 with an external thread, but for example, it may be blow molded from a resin such as polypropylene (PP), polyethylene (PE), or polyethylene terephthalate (PET). Bottles made of plastic, bottles made of multilayer film, glass bottles, laminated tubes, etc. can be used.

The mouth part 8 includes a first annular part 31 including the open end of the mouth part 8 (upper end in FIG. 2), a second annular part 32 connected to the first annular part 31, and a second annular part 32. 32 and a plurality of first ribs 41 provided on the outer circumferential surface. The outer diameter of the first annular portion 31 is d1, and the outer diameter of the second annular portion is d2 (d2<d1).

Each of the first ribs 41 is formed as a convex strip extending in a direction parallel to the central axis AX of the mouth portion 8 . Although the cross-sectional shape of the first rib 41 is not particularly limited, as shown in FIG. It is a protruding strip that is sandwiched between concave portions and has a partially linear outline. The first rib 41 connects a part of the outer circumferential surface of the second annular part 32 (for example, in a plan view, an angular range of 90 degrees centered on the central axis AX of the mouth part 8), and a point between the part and the outer circumferential surface of the second annular part 32. It is provided in symmetrical parts. The first rib 41 may be provided all around the second annular portion 32 . However, as a mold for blow molding the container body 2, it is common to use a mold divided into two by the mold dividing plane shown in FIG. In this case, it is difficult to provide ribs in the portion of the second annular portion 32 that intersects with the mold dividing surface and in the vicinity thereof. Therefore, when molding the container body 2 using a general mold, in the second annular part 32, a plane P that is perpendicular to the mold dividing plane and passes through the central axis AX and a second annular part 32 are formed. It is preferable that the first rib 41 is provided in a predetermined range in the circumferential direction centering on the portion where the portion 32 intersects with the first rib 41 . The first ribs 41 are arranged at a pitch corresponding to the pitch of the second ribs 42 provided on the inner stopper 3 in the circumferential direction of the second annular portion.

4 is a longitudinal cross-sectional view of the inner plug shown in FIG. 1, FIG. 5 is an enlarged end view of the "V" portion shown in FIG. 4, and FIG. 6 is a longitudinal sectional view of the inner plug shown in FIG. It is a back view. The back view of FIG. 6 corresponds to the view of the inner stopper shown in FIG. 4 from below.

The inner stopper 3 includes a top portion 12 , a fitting portion 11 , a fragile portion 13 , a protruding portion 14 , a flange portion 15 , and an inner ring 16 . The outer circumferential surface of the flange portion 15 and the inner circumferential surface of the engaging portion 24 of the cap 4 that abuts on the outer circumferential surface of the flange portion 15, or the top surface of the flange portion 15 and the inner surface of the top plate portion 21 that abuts thereon are made of ribs or knurls. Preferably, an anti-rotation structure is provided. This anti-rotation structure applies rotational cutting force when cutting the fragile portion 13, making it possible to easily open the package. The inner stopper 3 can be integrally molded by injection molding using, for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or a resin mixed therewith.

The top surface portion 12 is a substantially flat portion that is formed continuously with the annular fitting portion 11 . A portion of the top surface portion 12 functions as a partition wall that closes the inside of the fitting portion 11. The top surface portion 12 is provided with an annular weakened portion 13 . The weak portion 13 is a portion whose strength is relatively weaker than other portions of the top surface portion 12, and can be formed, for example, by making the thickness thinner than the other portions.

The fitting portion 11 is an annular (cylindrical) portion connected to the outer peripheral edge of the top surface portion 12 . The fitting part 11 can be fitted into the mouth part 8 of the container body 2 by plugging. The fitting part 11 includes a third annular part 33 connected to the outer peripheral edge of the top surface 12, and an open end (lower end in FIG. 4) of the fitting part 11, which is connected to the third annular part 33. It has a fourth annular portion 34 and a plurality of second ribs 42 provided on the inner circumferential surface of the fourth annular portion 34. The inner diameters of the third annular portion 33 and the fourth annular portion 34 are both d3. The inner diameter d3 of the third annular portion 33 and the fourth annular portion 34 is greater than or equal to the outer diameter d1 of the first annular portion shown in FIG. 2 (d3≧d1). Furthermore, the difference between the radius d3/2 of the inner circumferential surface of the third annular part 33 and the fourth annular part 34 and the radius d1/2 of the outer circumferential surface of the first annular part 31 is 34 in the circumferential direction of the second rib 42 (see FIG. 5) (d3/2-d1/2<h).

Each of the second ribs 42 extends in a direction parallel to the central axis AX of the inner stopper 3 and is formed as a protruding strip having a shape complementary to the groove formed between the adjacent first ribs 41. There is. Although the cross-sectional shape of the second rib 42 is not particularly limited, as shown in FIG. , is a convex strip having an arcuate outline. The second ribs 42 are arranged at a constant pitch all around the fourth annular portion 34 in the circumferential direction. However, the second rib 42 may be provided on a part of the outer peripheral surface of the fourth annular portion 34 as long as it can fit with the first rib 41.

Further, as shown in FIG. 5, the end portion 43 of the second rib 42 on the top surface portion 12 side is formed to have a spherical outer surface. Since the end portion 43 of the second rib 42 is spherical, the resistance when the second rib 42 is forcibly removed from the mold is reduced, and deformation of the second rib 42 is suppressed. I can do it. Although FIG. 5 shows an example in which the second rib 42 is formed over the vertical direction of the fourth annular portion 34, the second rib 42 is not limited to this, and may be formed, for example, at the lower end of the fourth annular portion 34. It does not have to be formed from a part of the

The protruding portion 14 is a portion of the top surface portion 12 that is connected to a portion surrounded by the fragile portion 13 and extends to the side opposite to the mouth portion 8 of the container body 2 (cap 4 side). Although the shape of the protruding part 14 is not particularly limited, in this embodiment, the protruding part 14 has a cylindrical shape and is connected to the top part 12 along the weakened part 13 provided on the top part 12.

The flange portion 15 is connected to the upper end of the cylindrical protruding portion 14 and is formed to expand in a direction perpendicular to the central axis (indicated by a chain line) of the inner plug 3. The flange portion 15 is a portion for engaging with the engaging portion 24 of the cap 4.

The inner ring 16 is an annular member provided on the inner surface of the container body 2 of the top surface portion 12. The inner ring 16 is in close contact with the inner peripheral surface near the open end of the opening 8 when the inner stopper 3 is fitted into the opening 8 of the container body 2, thereby improving the sealing performance of the inner stopper 3.

Referring again to FIG. 1, the cap 4 includes a top plate portion 21 having a flat plate shape, a cylindrical peripheral wall portion 23 connected to the outer peripheral edge of the top plate portion 21, and a cap 4 provided on the inner surface side of the top plate portion 21. and an engaging portion 24 that engages with the flange portion 15 of the inner stopper 3 while sandwiching a predetermined range from the outer peripheral edge of the flange portion 15 of the inner stopper 3. A rotation prevention structure for restricting rotation of the inner stopper 3 with respect to the cap 4 is provided on the outer peripheral surface of the flange portion 15 and the inner peripheral surface of the engaging portion 24 facing thereto. The anti-rotation structure can be formed by, for example, unevenness such as knurling or ribs that compete with each other. The cap 4 can be integrally molded by injection molding using, for example, polypropylene, high density polyethylene (HDPE), or LLDPE.

The inner stopper 3 is attached to the mouth part 8 of the container body 2 filled with contents by plugging and forming a fitting structure. In the case of the packaging container 1 shown in FIG. 1, in which the inner stopper 3 and the cap 4 are engaged, the inner stopper 3 is set in the cap 4 in advance, and the container body 2 filled with contents is It is preferable to attach the inner stopper 3 integrated with the cap 4 to the mouth part 8 by plugging.

In the inner stopper 3 according to the present embodiment, the third annular portion 33 and the second rib 42 provided on the inner peripheral surface of the fourth annular portion 34 form the undercut portion shown in FIGS. 7 and 8. 96 and 102. However, in the conventional fitting structure shown in FIG. 7 and FIG. Since the spread of 102 is restricted, strong force is required to fit the inner stopper into the mouth of the packaging container.

In contrast, in this embodiment, an annular portion with a constant inner diameter like the annular portions 98 and 104 shown in FIGS. The second rib 42 provided on the annular portion 34 of No. 4 functions as an undercut portion. Since the second ribs 42 provided on the fourth annular portion 34 are arranged intermittently at regular intervals in the circumferential direction, the second ribs 42 are arranged intermittently at regular intervals in the circumferential direction. There is less restriction on the expansion of the fitting portion 11 when the plug is fitted, and the force required for plugging and fitting can be reduced. Since the inner plug 3 can be plugged and fitted with a smaller force than the conventional method, it is effective when the position to which force is applied during plugging is limited. For example, as in the present embodiment, when the inner stopper 3 provided with the fragile portion 13 is set in the cap 4 and then the inner stopper 3 is fitted into the container body 2, the fitting part 11 is directly inserted into the inner stopper 3. It is not possible to apply the force of capping. In this case, it is necessary to seal the cap by pressing the top plate portion 21 of the cap 4, and force is likely to be applied to the fragile portion 13 due to the capping. With the plugging structure according to this embodiment, the force required for plugging the inner plug 3 is reduced compared to the conventional one, so that the plugging structure can be more efficiently plugged while suppressing breakage of the fragile portion 13. This makes it possible to seal the container body 2 in a consistent manner.

When the inner stopper 3 is fitted into the mouth 8 of the container body 2, the rotation of the inner stopper 3 relative to the container main body 2 is restricted by fitting the first rib 41 and the second rib 42. In the packaging container 1 which has the function of opening the inner stopper 3 as the cap 4 is rotated, as in this embodiment, in order to easily cut off the top surface 12 of the inner stopper 3, the inner stopper is attached to the container body 2. Preferably, rotation of the stopper is suppressed. Therefore, the fitting structure according to this embodiment is suitable for the packaging container 1 having such an opening function.

Furthermore, in the inner stopper 3 according to the present embodiment, the fourth annular portion 34 including the open end of the fitting portion 11 is provided with a plurality of second ribs 42 that function as an undercut portion. With this configuration, deformation of the fitting portion 11 is suppressed when the inner stopper 3 is extracted from the mold, so that the rotation prevention function is reduced when the inner stopper 3 is fitted into the container body 2. can be suppressed. In particular, as shown in FIG. 5, when the end 43 of the second rib 42 on the side of the top surface 12 is made spherical, the resistance when the inner plug 3 is extracted from the mold can be further reduced. Deformation of the fitting portion 11 can be further suppressed.

As explained above, according to the present embodiment, it is possible to realize a fitting structure that can prevent rotation of the inner stopper 3 with respect to the container body 2 and reduce the force required for plugging and fitting the inner stopper 3. I can do it.

In addition, in the above embodiment, an example was described in which the cross-sectional shape of the second rib is arcuate, but the first rib and the second rib can fit into each other and compete with each other in the circumferential direction. The cross-sectional shapes of the first rib and the second rib are not particularly limited as long as they have the same shape. For example, the outline of one or both of the first rib and the second rib may be shaped like an elliptical arc, a triangle, or a trapezoid.

Furthermore, in the above embodiment, an example was explained in which the fitting structure according to the present invention is applied to a packaging container configured to cut out a part of the inner stopper by rotating the cap. ) The fitting structure according to the present invention may be applied to a packaging container configured such that a pull ring is connected to an annular weakened portion provided in the inner plug and the cap is not engaged with each other. In this case, since rotation of the inner stopper with respect to the container body can be prevented, the fragile portion of the inner stopper can be easily broken by pulling the pull ring.

Furthermore, in the above embodiment, an example in which the present invention is applied to a packaging container in which a part of the inner stopper is cut out by rotating the cap has been described. The plug may be provided with an opening for taking out the contents of the packaging container to the outside of the packaging container, and a screw-type cap for closing the opening. Further, for example, when the cap is screwed onto the outer circumference of the inner stopper, according to the present invention, rotation of the inner stopper with respect to the container body can be prevented, so that the cap can be screwed on more easily.

Furthermore, a window portion may be provided in the peripheral wall portion of the protruding portion 14 to serve as a flow path for the contents after the cap is opened. In this case, the cap 4 may be a hinged cap configured to open the top and allow the contents to be taken out to the outside through a window. In addition, when a window is formed, when the cap 4 is closed and the fragile portion 13 is broken, a stopper is provided on the cap 4, and the stopper comes into contact with the inner stopper 3, thereby regulating the descent of the cap 4. It's okay. The shape of this stopper is not particularly limited, and may be in the shape of a ring hanging from the cap 4, for example. Since the stopper is formed into a ring shape and comes into contact with the inner stopper 3, it is possible to prevent the contents from flowing out.

In addition, in the above embodiment, the shapes of the first rib and the second rib, the heights of the first rib and the second rib (height in the radial direction from the outer circumferential surface of the annular portion), the first The number and length of the ribs and second ribs are not particularly limited, and are subject to various conditions such as the plugging strength required to fit the inner stopper into the container body and the fitting strength after fitting. It can be changed as appropriate.

Further, in the above embodiment, in the radial direction of the mouth of the container body, the ridgeline of the first rib may be located outside the outer circumferential surface of the first annular portion, or It may be located inside the outer peripheral surface of the section.

INDUSTRIAL APPLICATION This invention can be utilized for various containers, including packaging containers such as seasoning containers, which require a function to prevent rotation of an inner stopper with respect to a container body.

1 Packaging container 2 Container body 3 Inner stopper 8 Mouth part 11 Fitting part 12 Top part 13 Fragile part 31 First annular part 32 Second annular part 33 Third annular part 34 Fourth annular part 41 First Rib 42 Second rib 43 End

Claims (4)

A mating structure,
a container body having a cylindrical mouth;
An inner stopper having a top surface portion and an annular fitting portion connected to an outer peripheral edge of the top surface portion, the fitting portion fitting into an open end portion of the mouth portion to close the mouth portion. Equipped with
The mouth of the container body is
a first annular portion forming an open end of the mouth portion;
a second annular part connected to the first annular part and having an outer diameter smaller than an outer diameter of the first annular part;
a plurality of first ribs provided on the outer circumferential surface of the second annular portion and extending in a direction parallel to the central axis of the mouth portion;
The fitting portion of the inner stopper is
a third annular portion connected to the outer peripheral edge of the top surface portion and having an inner diameter greater than or equal to the first annular portion;
a fourth annular part connected to the third annular part, having an inner diameter equal to that of the third annular part, and constituting an open end of the fitting part;
a plurality of second ribs provided on the inner circumferential surface of the fourth annular portion and extending in a direction parallel to the central axis of the inner plug;
The height of the second rib in the radial direction of the fourth annular portion is greater than the difference between the inner diameter of the third annular portion and the outer diameter of the first annular portion,
In a state in which the inner stopper is fitted into the mouth of the container main body, the first annular part and the second annular part are arranged inside each of the third annular part and the fourth annular part. is accommodated, and the second rib fits into a groove between the adjacent first ribs. The second ribs are arranged at a constant pitch all around the inner peripheral surface of the fourth annular part,
The fitting structure according to claim 1, wherein the first ribs are arranged on a part of the outer peripheral surface of the second annular portion at a pitch corresponding to an arrangement pitch of the second ribs. The fitting structure according to claim 1 or 2, wherein an end of the second rib on the top surface side is spherical. The fitting structure according to any one of claims 1 to 3, wherein the second rib has a shape complementary to a groove between adjacent first ribs.

Images