JP2022053423A - Plug-type synthetic resin cap - Google Patents

Abstract

To provide a plug-type synthetic resin cap having a structure that improves recyclability and has both high sealing performance and ease of opening.SOLUTION: The plug-type synthetic resin cap of the present invention is a plug-type synthetic resin cap that fits into a jaw portion formed at a mouth portion of a container, and includes a top wall, a skirt wall hanging from the top wall, a flange portion provided on the skirt wall and projecting outward in a radial direction, and a locking projection formed inside the skirt wall and engaging with the jaw portion. A notch is formed at a lower end of the skirt wall on an opposite side to the flange portion.SELECTED DRAWING: Figure 1

Description

The present invention relates to a stopper-type synthetic resin cap that is used by being fitted into a relatively wide-mouthed container such as a milk bottle, and more specifically, it has high ease of opening while being able to be disposed of together with the container. Regarding the cap of the structure.

For example, as a container for storing milk beverages such as milk, a bottle having a relatively large spout (hereinafter, such a bottle is also referred to as a "wide-mouthed bottle") is known. As the cap for sealing such a wide-mouthed bottle, for example, a cap having a structure as exemplified in Patent Document 1 is used.

Conventionally, glass has been preferably used as a material for constituting the above-mentioned wide-mouthed bottle, but in recent years, polyester resin such as PET has also been used from the viewpoint of weight reduction and the like. In parallel with this, recently, used polyester resin bottles are being collected from the viewpoint of recycling.

On the other hand, Patent Document 2 proposes that in the above-mentioned recycling, by forming the cap with the same material as the polyester resin bottle, the recovered bottle and the cap are not separated and the recycling process is simplified. ing.

Japanese Unexamined Patent Publication No. 2014-223933 Japanese Unexamined Patent Publication No. 2000-256472

Not limited to the wide-mouthed bottles described above, caps for sealing containers are required to have both high sealing performance at the time of sealing and ease of opening at the time of opening. In this regard, in Patent Document 1 described above, although the above characteristics are realized by using a relatively soft olefin resin such as polyethylene as the material constituting the cap, the cap is composed of a material different from that of the container. Separate collection is required.

On the other hand, as illustrated in Patent Document 2, when the cap is made of the same material as the wide-mouthed bottle, the above-mentioned separate collection is unnecessary, but the container is made of a relatively hard polyester material. The high sealing performance and the ease of opening are deteriorated.
More specifically, the cap for sealing the wide-mouthed bottle may be provided with a flange portion as exemplified in Patent Document 1. In this case, when the user pushes up the collar portion to try to open the cap, the opposite side of the collar portion is caught by the bottle mouth in the cap made of the above-mentioned hard material, which makes it difficult to open the cap.

As described above, there is still room for improvement in the prior art including the above patent documents, and as an example of the purpose of the present invention, a plug having a structure having improved recyclability, high sealing performance and easy opening. The provision of a synthetic resin cap may be mentioned.

In order to solve the above problems, the stopper-type synthetic resin cap according to one embodiment of the present invention is (1) a stopper-type synthetic resin cap that fits with the jaw portion formed at the mouth of the container, and is a top wall. A skirt wall that hangs down from the top wall, a flange portion that is provided on the skirt wall and projects outward in the radial direction, and a locking protrusion that is formed inside the skirt wall and engages with the chin portion. , And a notch is formed at the lower end of the skirt wall on the opposite side of the chin.

In the stoppered synthetic resin cap described in (1) above, (2) the notch is formed at least below the lower end of the jaw while being attached to the mouth. preferable.

Further, in the plugging type synthetic resin cap described in (2) above, it is preferable that (3) the upper end of the notch portion has the same height as the lower end of the jaw portion.

Further, in the plugging type synthetic resin cap according to any one of (1) to (3) described above, (4) the locking projection is along the circumferential direction inside the skirt wall except for the notch. It is preferably formed intermittently.

Further, in the plugging type synthetic resin cap according to any one of (1) to (4) described above, (5) the size of the locking projection in the circumferential direction is larger than the size of the notch in the circumferential direction. Small is preferable.

In the plugging type synthetic resin cap according to any one of (1) to (5) above, (6) the size of the notch portion in the circumferential direction is equal to or less than the size of the flange portion in the circumferential direction. It is preferable that it is set to.

Further, in the plugging type synthetic resin cap according to any one of (1) to (6) described above, (7) the notch portion has an upper side extending along the circumferential direction on the side of the top surface wall and the upper side. It is preferable to have a trapezoidal shape having a virtual bottom that extends longer in the circumferential direction than the upper side and is parallel to the upper side, and a hypotenuse that connects the upper side and the virtual bottom.

Further, the plugging type synthetic resin cap according to any one of (1) to (7) described above is preferably (8) a polyester resin having a melting point of 230 ° C. to 270 ° C.

Further, it is preferable that the plugging type synthetic resin cap according to any one of (1) to (8) described above is made of the same material as (9) the container.

According to the stopper-type cap of the present invention, it is possible to realize high sealing performance and ease of opening while improving recyclability.

It is external perspective view of the stopper type synthetic resin cap in embodiment. It is the top view and the bottom view seen from the bottom side of the stopper type synthetic resin cap seen from above. It is a side view of the stopper type synthetic resin cap. It is a schematic diagram which includes the partial cross section of the stopper type synthetic resin cap. It is sectional drawing which shows the state at the time of closing of the stopper type synthetic resin cap. It is sectional drawing of the plug type synthetic resin cap. It is an external perspective view when the stopper type synthetic resin cap is fitted in the mouth part of a container. It is a graph which shows an example of the effect verification of a stopper type synthetic resin cap.

Hereinafter, embodiments for preferably carrying out the present invention will be described.
In the present embodiment, the X, Y, and Z directions are appropriately set in the explanation using figures for convenience of explanation, but the present invention is not excessively limited for convenience of explanation. Further, other than the configurations described in detail below, known structures of containers and caps can be appropriately used.

<< Plug-type synthetic resin cap 100 >>
The structure of the plugging type synthetic resin cap 100 according to the present embodiment will be described in detail with reference to FIGS. 1 to 7.
As shown in FIG. 1 and the like, the plugging type synthetic resin cap 100 of the present embodiment has a function of fitting with the jaw portion 202 formed in the mouth portion 201 of the container 200 described later, and has the top surface wall 10 and the top wall 10. A skirt wall 20 that hangs down from the peripheral edge of the top wall 10 along the axial direction (Z direction in the figure), and a flange portion 30 that is provided on the skirt wall 20 and projects outward in the radial direction (mainly in the X direction in the figure). It is configured to include at least.

Here, as the container 200 suitable for this embodiment, for example, a wide-mouthed bottle having a relatively wide spout, such as a known milk bottle, can be exemplified. The container 200 is not limited to the wide-mouthed bottle described above, and a bottle having a general diameter for storing soft drinks, tea, or the like may be applied. Further, as the material of the container 200, a polyester resin such as polyethylene terephthalate (PET) resin is preferable, but there is no particular limitation and various known materials can be applied.

The contents stored in the container 200 are not particularly limited, and various known liquids such as milk drinks such as milk and soft drinks such as tea can be applied. Further, as the content to be stored in the container 200, a known solid material such as a drug such as a tablet or a food or a known semi-solid material in the form of a gel may be applied instead of the various liquids described above.

As can be understood from FIGS. 4, 5 and 7, such a container 200 is formed in a mouth portion 201 in which a spout for pouring contents from the container body is formed and an outer lower portion of the mouth portion 201. It is configured to include a jaw portion 202 having an R-shaped cross section and a support ring (neck support) 203 provided below the jaw portion 202 and used for transportation and the like. The support ring 203 is not essential in the present embodiment and may be omitted as appropriate.

The plugging type synthetic resin cap 100 of the present embodiment is preferably made of the same material as the container 200 from the viewpoint of improving the convenience of recycling described above. For example, when a known PET resin (polyester resin) having a melting point of 230 ° C. to 270 ° C. is applied as the material of the container 200, it is composed of a plugging type synthetic resin cap 100 made of the same PET resin (polyester resin). It is preferable that it is.

PET resin is suitable as the beverage container, but for example, when the container 200 is used for purposes other than beverage use, a known general-purpose resin or engineering plastic other than PET resin can be applied. Even in this case, by applying the plugging type synthetic resin cap 100 of the same material to such a container 200 as a so-called single material, the convenience of recycling can be improved.

<Tsuba 30>
Next, the flange portion 30 provided on the plugging type synthetic resin cap 100 of the present embodiment will be described in detail. As shown in FIGS. 1, 2 and 5, in the plugging type synthetic resin cap 100 of the present embodiment, a flange portion 30 projecting outward in the radial direction is formed on the skirt wall 20.

As is clear from these figures, the flange portion 30 is preferably provided above the outer peripheral surface 20a of the skirt wall 20 above the middle in the axial direction. Further, it is preferable that the flange portion 30 is provided below the upper end (the same height as the top wall 10) in the axial direction of the outer peripheral surface 20a of the skirt wall 20.

More specifically, as an example, it is preferable that the flange portion 30 of the present embodiment is provided above the notch portion 50 described later in the outer peripheral surface 20a of the skirt wall 20 in the axial direction. As a result, the user can remove the plugging type synthetic resin cap 100 from the mouth portion 201 without requiring an excessive opening force.

Further, as shown in FIG. 2B, the size S1 in the circumferential direction of the flange portion 30 is the size S2 in the circumferential direction of the notch portion 50 described later (substantially the size of the virtual base 50b described later). It is preferable that the setting is the same as or larger than (S1 ≧ S2). However, the present invention is not limited to the above setting, and S1 <S2 may be set as long as the opening property and the sealing property are not impaired.

As shown in FIGS. 4 to 6, the bottom surface 10b of the top wall 10 in the present embodiment has a function of engaging with the inner peripheral surface side of the mouth portion 201 at the time of closing to seal the contents of the container 200. An inner ring 11 is provided. More specifically, as shown in FIG. 5, the inner ring 11 of the present embodiment is formed so as to hang down from the bottom surface 10b of the top wall 10 so that the diameter increases slightly toward the bottom.

Further, in the plugging type synthetic resin cap 100 of the present embodiment, the flange portion 30 provided on the outer peripheral surface 20a of the skirt wall 20 is the lower end of the inner ring 11 described above in consideration of sealing property and ease of opening. It is preferable that they are arranged at substantially the same height in the axial direction. As a result, it is possible to prevent the user from applying an excessive force when the flange portion 30 is lifted and opened.

<Locking protrusion 40>
Further, as can be understood from FIGS. 2 and 6, the inside of the skirt wall (inner peripheral surface 20b of the skirt wall 20) in the present embodiment is locked to engage with the jaw portion 202 of the container 200. The protrusion 40 is provided.

Then, in the present embodiment, as shown in FIGS. 2 and 6, the locking projection 40 of the present embodiment has an inner peripheral surface of the skirt wall 20 except for the lower portion of the flange portion 30 described above and the notch portion 50 described later. It is preferably formed intermittently along the circumferential direction of 20b. As a result, for example, in the case of manufacturing by injection molding, stable die cutting is possible, the locking projection 40 ensures an appropriate fitting force required for fitting with the jaw portion 202, and the user also when opening the cap. Can be detached from the mouth 201 without requiring excessive force.

As shown in FIG. 2, a total of six locking projections 40 (first locking projections 40a to sixth locking projections 40f) are provided along the circumferential direction. However, the number of the locking projections 40 is not limited to the above-mentioned six, and any number other than the six may be provided, for example, eight, depending on the above-mentioned fitting force and the like.

Further, as can be understood from the figure, the size d ₂ in the circumferential direction of each of the locking protrusions 40 (the first locking protrusions 40a to the sixth locking protrusion 40f) is the size in the circumferential direction of the notch portion 50. It is preferably smaller than S ₂ . Further, in the present embodiment, the first locking projections 40a to the sixth locking projections 40f described above have the same dot shape as each other, but the present invention is not limited to this embodiment.

As an example of the form of such a locking projection 40, instead of the above, for example, at least a part of the plurality of locking projections 40 may have different sizes d ₂ in the circumferential direction. Further, the shape of the locking projection itself may be, for example, an elliptical shape or a rectangular shape whose circumferential direction is relatively longer than the axial direction, instead of the dot shape.

<Notch 50>
Next, the notch 50 provided in the plugging type synthetic resin cap 100 of the present embodiment will be described in detail. As can be understood from FIGS. 1 to 5, in the plugging type synthetic resin cap 100 of the present embodiment, a notch 50 is formed at the lower end of the skirt wall 20 on the opposite side of the flange 30. There is.

Such a notch 50 is provided so that the lower end of the skirt wall 20 does not get caught in the mouth 201 of the container 200 when the user lifts the collar 30 at the time of opening the cap.
As a general rule, for example, at the time of opening, the user hooks a finger or the like on the flange portion 30 of the stopper type synthetic resin cap 100 to flip up the stopper type synthetic resin cap 100 from the mouth portion 201 of the container 200. conduct.

At this time, for example, when the stopper type synthetic resin cap 100 is made of a resin (PET resin or the like) of the same material as the container 200, for example, the stopper type synthetic resin cap 100 formed of PET resin is a conventional soft resin (PET resin or the like). Since it is more rigid than a cap made of (olefin resin, etc.), it is expected that it will not be easily deformed at the time of opening and will require a relatively strong opening force.

In such a situation, for example, in the case of a skirt wall having a conventional structure having no notch 50, when the user lifts the flange 30, the lower end of the skirt wall 20 on the side opposite to the flange 30 becomes. It gets caught in the lower part of the jaw portion 202 (between the jaw portion 202 and the support ring 203 in this example), and it becomes difficult to remove the plug-type synthetic resin cap from the container 200.

On the other hand, in the plugging type synthetic resin cap 100 of the present embodiment, since the above-mentioned notch portion 50 is provided (in other words, in the notch portion 50, the lower end of the skirt wall 20 is raised upward. Therefore, even if the stopper-type synthetic resin cap 100 is turned up with respect to the mouth portion 201 of the container 200 via the flange portion 30 at the time of opening, the skirt that serves as a rotation fulcrum on the opposite side of the notch portion 50. It is prevented that the raised lower end of the wall 20 is caught under the jaw portion 202 of the container 200.
Due to the action of the notch portion 50 described above, in the present embodiment, even a cap made of a resin such as PET resin, which is hard to be deformed, can be greatly improved in opening property.

As long as it has such a function, the shape of the notch portion 50 is not particularly limited, and various shapes can be adopted. As an example, in the present embodiment, as shown in FIG. 3, the notch portion 50 has an upper side 50a extending along the circumferential direction on the side of the top wall 10 and extending in the circumferential direction longer than the upper side 50a. It has a trapezoidal shape having a virtual bottom side 50b parallel to the upper side 50a and a hypotenuse 50c connecting the upper side 50a and the virtual bottom side 50b.

As will be described later with reference to FIG. 5, the position (height from the lower end of the skirt wall) of the upper end (upper side 50a) of the notch portion 50 in the axial direction is preferably at least about the same as the jaw portion of the container 200. ..
On the other hand, as shown in FIG. 3, it is preferable that the height h1 of the flange portion 30 from the lower end of the skirt wall is set to the height h2 or more of the notch portion 50 from the lower end of the skirt wall. However, in the illustrated form, h1> h2, but for example, the upper end (upper side 50a) of the notch portion 50 in the axial direction may be set to the same height (h1 = h2) as the lower end of the flange portion 30. ..

Further, as shown in FIG. 2, the size S2 in the circumferential direction of the notch portion 50 (corresponding to the circumferential length of the virtual bottom 50b longest in the circumferential direction in the present embodiment) is the flange portion 30. The size in the circumferential direction may be set to S1 or less. In the present embodiment, the size S1 of the flange portion 30 is formed to have the same size so as to be slightly larger than the size S2 of the flange portion 30, but the degree of catching and the locking projection 40 described above are formed. The size S2 in the circumferential direction of the notch portion 50 may be set larger than the size S1 in the circumferential direction of the flange portion 30 depending on the formation position and the like.

In this way, the size S2 in the circumferential direction of the notch portion 50 is set to about the size S1 in the circumferential direction of the flange portion 30 centering on the opposite side of the flange portion 30, so that the user can open the cap. It is possible to suppress the above-mentioned catching regardless of which part of the flange portion 30 is pushed up.

<The state when the cap is attached and the state when the cap is opened>
Next, with reference to FIGS. 4, 5 and 7, the plugging type synthetic resin cap 100 of the present embodiment is attached to the mouth portion 201 of the container 200, and the tapping type synthetic resin cap 100 is the mouth portion. The state at the time of opening the cap, which is detached from 201, will be described.

As shown in these figures, when the stopper type synthetic resin cap 100 closes the mouth portion 201, the mouth portion 201 is covered with the inner peripheral surface 20b of the skirt wall 20 in the region excluding the notch portion 50. ing. As a result, most of the mouth portion 201 of the container 200 is shielded by the skirt wall 20 at the time of closing, so that the hygiene of the mouth portion 201 at the time of closing is improved.

As illustrated in FIGS. 5 (b) and 5 (c), the notch portion 50 is preferably formed at least in the jaw portion 202 or less in a state of being attached to the mouth portion 201.
When hygiene is more important, for example, as shown in FIG. 5C, the jaw portion 202 and the upper side 50a of the notch portion 50 have substantially the same height (position) in the axial direction. May be good.

On the other hand, for example, when giving priority to openness, for example, as shown in FIG. 5B, the upper side 50a of the notch portion 50 is located above the lower end of the jaw portion 202 in the axial direction (in the figure, in the figure). The height h2 of the upper side 50a of the notch portion 50 (see also FIG. 2a as appropriate) may be set so as to be arranged above only by the distance d1).

The present embodiment described above is particularly useful when the container and the cap are made of a polyester resin such as a single material (monomaterial) PET resin.
Specifically, according to the plugging type synthetic resin cap 100 of the present embodiment, first, by using the same material as the container 200, the container and the cap can be recycled without being separated.

Secondly, according to the plugging type synthetic resin cap 100, by forming the above-mentioned notch portion 50 at the lower end of the skirt wall 20, a high sealing is performed while ensuring the hygienic aspect of the mouth portion 201 of the container 200. It is possible to realize both sex and ease of opening at the same time.

As an example of effect verification, (A) a container equipped with the stopper-type synthetic resin cap 100 of the present embodiment (both molded with PET resin), and (B) a container in which the above-mentioned notch 50 is not formed (both). FIG. 8 shows the results of measuring the opening force in comparison with (molded with PET resin) and (C) a commercially available glass bottle product (with a soft cap attached).

In this measurement, using a known compression tensile tester (force gauge, push-pull gauge), the opening force (N) required to pull up the flanges of the above three types of caps in the vertical direction is calculated. did. At this time, the temperature of each cap was set to 15 ° C., and milk was sealed in each container as an example of the contents. Then, after storing each container containing milk for one day, the presence or absence of leakage was confirmed, and the opening force was measured for the above three types of containers without leakage.

As is clear from FIG. 8, in the container equipped with the plugging type synthetic resin cap 100 of the present embodiment, a reduction in the opening force of about 50% is observed as compared with the cap having no notch 50, and the glass bottle product. Compared with (a soft cap is attached), the peak value of the opening force was reduced by about 15%, and it was found that the opening property was greatly improved. It can be inferred that this was largely due to the reduction in the amount of engagement of the lower end of the skirt wall with the mouth of the container in the latter half of the opening operation.

The above embodiment is an example, and various modifications can be made without departing from the spirit of the present application. For example, the inner ring 11 is provided on the top wall 10 of the plug-type synthetic resin cap 100, but instead of or in addition to this, a known rubber member such as packing may be arranged on the bottom surface 10b of the top wall 10. good.

Further, in the plugging type synthetic resin cap 100 of the above-described embodiment, a single notch portion 50 is formed at the lower end of the skirt wall 20 on the opposite side of the flange portion 30, but the present invention is not limited to this embodiment and is not limited to the circumferential direction. A plurality of notches 50 may be provided intermittently.

Further, in the above-described embodiment, the shape of the notch portion 50 is substantially trapezoidal, but the shape is not limited to this form, and various shapes such as a square shape, an elliptical shape, or a triangular shape can be expected as long as the above-mentioned improvement in opening property can be expected. It may have a shape.

Further, the position of the flange portion 30 in the axial direction may be appropriately changed according to the above-mentioned design value of the opening force. That is, the above-mentioned flange portion 30 is provided above the notch portion 50 in the axial direction, but is not limited to this form, and is not limited to this form, and is at the same position in the axial direction as the upper side 50a of the notch portion 50, or the upper side thereof. It may be positioned below 50a.

INDUSTRIAL APPLICABILITY The present invention is suitable for realizing a plug-type cap having high sealing performance and ease of opening while improving the convenience of recycling.

100 Plug-in type synthetic resin cap 10 Top wall 20 Skirt wall 30 Collar 40 Locking protrusion 50 Notch 200 Container 201 Mouth 202 Jaw

Claims (9)

A plug-type synthetic resin cap that fits into the jaw formed at the mouth of the container.
With the top wall,
The skirt wall hanging from the top wall and
A flange portion provided on the skirt wall and projecting outward in the radial direction,
Includes a locking projection, which is formed inside the skirt wall and engages the jaw.
A plug-type synthetic resin cap characterized in that a notch is formed at the lower end of the skirt wall on the opposite side of the collar. The plugging type synthetic resin cap according to claim 1, wherein the notch is formed at least below the lower end of the jaw while being attached to the mouth. The plugging type synthetic resin cap according to claim 2, wherein the upper end of the notch portion is at the same height as the lower end of the jaw portion. The plugging type synthetic resin cap according to any one of claims 1 to 3, wherein the locking projection is intermittently formed along the circumferential direction inside the skirt wall except for the notch portion. .. The plugging type synthetic resin cap according to any one of claims 1 to 4, wherein the size of the locking projection in the circumferential direction is smaller than the size of the notch in the circumferential direction. The plugging type synthetic resin cap according to any one of claims 1 to 5, wherein the size of the notch portion in the circumferential direction is set to be equal to or smaller than the size of the flange portion in the circumferential direction. The notch portion has an upper side extending along the circumferential direction on the side of the top wall, a virtual bottom extending longer in the circumferential direction than the upper side and parallel to the upper side, and the upper side and the virtual bottom. The plugging type synthetic resin cap according to any one of claims 1 to 6, which has a trapezoidal shape having a connecting hypotenuse. The plugging type synthetic resin cap according to any one of claims 1 to 7, which is a polyester resin having a melting point of 230 ° C. to 270 ° C. The plugging type synthetic resin cap according to any one of claims 1 to 8, which is made of the same material as the container.

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