JP2023003901A - Capped container and cap - Google Patents

Abstract

To provide a capped container and a cap, suppressed in the degradation of sealability caused by a rise in the inner pressure of the capped container.SOLUTION: A capped container 10 is provided in which an outer ring 34 has an upper side region 35 having upper side sealing parts 35a, 35b coming into contact with a line-unformed region 61a of a mouth cylindrical part 61 of the container in a cap fitted state, and a lower side extension region 36 having a lower side additional sealing part 36a formed at the lower side of the upper side region 35 and arranged at the outer peripheral side of a line-formed region 61b of the mouth cylindrical part 61 of the container with a gap, in the cap fitted state.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to capped containers and caps, and more particularly to capped containers and caps used in applications where the inside of the container has a positive pressure.

Conventionally, as a container with a cap for containing a beverage or the like, an outer ring formed by protruding downward from the top wall of the cap is brought into close contact with the container opening while the cap is attached to the container. There is known a device that seals between a cylindrical portion and an outer ring to maintain the airtightness of a container with a cap (see, for example, Patent Document 1).

JP 2015-009853 A

In such a container with a cap, when the internal pressure of the container with the cap becomes positive, such as when a carbonated drink is stored in the container at a high temperature, the top wall of the cap becomes a dome due to the increase in internal pressure. Depending on the degree of deformation of the top wall, the outer ring may move upward with respect to the container mouth part and be separated from the container mouth part, resulting in a sealed container with a cap. There is a problem that the quality may be reduced.

As a measure to suppress the deterioration of the sealability of the capped container as described above, it is conceivable to suppress the deformation of the top wall itself by selecting the thickness and material of the top wall. Depending on storage conditions, it is difficult to prevent the top wall from bending, and there is also the problem that the degree of freedom in designing the size, material, etc. of the cap is impaired.

Accordingly, the present invention is intended to solve these problems, and it is an object of the present invention to provide a container with a cap and a cap that have a simple structure and suppress deterioration in airtightness due to an increase in the internal pressure of the container with a cap. It is something to do.

A container with a cap of the present invention is a container with a cap comprising a container having a container mouth section and a cap attached to the container mouth section, wherein the container mouth section has a party on its outer peripheral surface. and a line-formed region below the line-unformed region and having a parting line formed on the outer peripheral surface of the line-formed region. and an outer ring that protrudes downward from the top wall and is arranged on the outer peripheral side of the container mouth portion in a state in which the cap is attached to the container mouth portion, wherein the The outer ring is formed in an upper region having an upper seal portion that contacts the line-unformed region in the cap-mounted state, and in a lower side of the upper-side region, and is formed in the line-formed region in the cap-mounted state. The above problem is solved by providing a lower extension region having a lower additional seal portion arranged with a gap on the outer peripheral side.
The cap of the present invention includes a line-unformed region in which a parting line is not formed on the outer peripheral surface and a line-formed region in which the parting line is formed in the outer peripheral surface of the cap, which is an area below the line-unformed region. and a cap to be attached to the container mouth portion, wherein the cap is formed by protruding downward from a top wall and the top wall, and the cap is attached to the container mouth portion an outer ring disposed on the outer peripheral side of the container mouth tube portion in an attached state, wherein the outer ring includes an upper region having an upper seal portion that contacts the line non-formed region in the cap attached state; and a lower extension area having a lower additional seal portion formed below the upper area and arranged with a gap on the outer peripheral side of the line forming area in the cap mounted state. By doing so, the above problems are solved.

According to the present invention, the outer ring of the cap includes the upper region having the upper seal portion that contacts the line-unformed region when the cap is attached to the container opening, and the upper region. A lower extension region having a lower additional seal portion formed on the lower side and arranged with a gap on the outer peripheral side in the line forming region in the state where the cap is attached is provided. As a result, by avoiding the contact of the outer ring with the line forming region of the container mouth where the parting line is formed as the trace of the mating surface of the mold, the outer ring can be prevented from contacting the line forming region of the container mouth. The outer ring moves upward with respect to the container mouth portion due to the rise in the container internal pressure while avoiding the obstruction of the contact of the upper seal portion with the line-unformed region of the container mouth portion. Even in such a case, it is possible to maintain the seal between the container mouth portion and the outer ring by bringing the lower additional seal portion into contact with the line-unformed region of the container mouth portion. With this configuration, it is possible to suppress a decrease in airtightness due to an increase in the internal pressure of the capped container.

Explanatory drawing which shows the cap which concerns on 1st Embodiment of this invention. Explanatory drawing which shows the contact state of the outer ring with respect to a container mouth tube part. FIG. 3 is an explanatory view showing a state in which the container internal pressure has increased from the state in FIG. 2; FIG. 4 is an explanatory view showing a state in which the container internal pressure has increased from the state in FIG. 3; Explanatory drawing which shows the cap which concerns on 2nd Embodiment of this invention. Explanatory drawing which shows the contact state of the outer ring with respect to a container mouth tube part. FIG. 7 is an explanatory view showing a state in which the container internal pressure has increased from the state in FIG. 6; FIG. 8 is an explanatory diagram showing a state in which the internal pressure of the container has increased from the state in FIG. 7; Explanatory drawing which shows the example of a parting line.

A capped container 10 according to a first embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2 , the capped container 10 includes a synthetic resin container 60 having a container mouth portion 61 and a synthetic resin cap 20 attached to the container mouth portion 61 .

The cap 20 includes a cap body 30 and a TE band 40 connected to the lower end of the cap body 30 via a weakened portion 50, as shown in FIG.

As shown in FIGS. 1 and 2 , the cap body 30 has a disk-shaped top wall 31 and a cylindrical skirt wall 32 hanging down from the outer peripheral edge of the top wall 31 .

As shown in FIGS. 1 and 2 , the top wall 31 includes an inner ring 33 protruding downward from the bottom surface of the top wall 31 and an outer ring 33 protruding downward from the bottom surface of the top wall 31 on the outer peripheral side of the inner ring 33 . 34 are formed.

As shown in FIG. 1, the outer peripheral wall of the skirt wall 32 is formed with knurled portions (knurled grooves) 32a. A cap-side threaded portion 32b is formed to be screwed with the formed container-side threaded portion 62 .

As shown in FIG. 2, the inner ring 33 is in a state where the cap 20 is attached to the container mouth portion 61 (the cap side thread portion 32b is screwed into the container side thread portion 62, and the container mouth portion 61 is attached). 61, the cap 20 is engaged to the lowermost side with respect to the container mouth portion 61), and the cap circumference is attached to the inner peripheral side of the container mouth portion 61 at a position below the contact point of the outer ring 34 with respect to the container mouth portion 61. It seals between the container opening portion 61 and the cap 20 by closely contacting over the entire circumference. The inner ring 33 is formed so as to be in contact with the inner peripheral surface of the container mouth tube portion 61 in any of the states shown in FIGS. 2 to 4, which will be described later.

As shown in FIG. 2, when the cap is attached, the outer ring 34 is in close contact with the outer peripheral side of the container mouth portion 61 over the entire circumferential direction of the cap to provide a gap between the container mouth portion 61 and the cap 20. It is a seal. The outer ring 34 has the same cross-sectional shape over the entire circumferential direction of the cap.

As shown in FIG. 2, the outer ring 34 has an upper region 35 positioned on the outer peripheral side of a line non-formed region 61a of the container mouth tube portion 61 described later and a lower side of the upper region 35 in a state where the cap is attached. It has a downward extension region 36 formed continuously and located on the outer peripheral side of a line forming region 61b of the container mouth tube portion 61, which will be described later.

As shown in FIG. 2, when the cap is attached, the upper region 35 contacts (closely contacts) the line-unformed region 61a of the container mouth portion 61 over the entire circumference of the cap in the circumferential direction of the container mouth portion 61. It has upper seal portions 35a and 35b for sealing with the outer ring 34. In the first embodiment, it has a first upper seal portion 35a and a second upper seal portion 35b.

As shown in FIG. 2, the first upper seal portion 35a is formed so as to be convex toward the inner peripheral side, and when the cap is attached, the first upper seal portion 35a contacts the outer peripheral surface of the line-unformed region 61a. is formed in
As shown in FIG. 2, the second upper seal portion 35b is formed on the upper side of the first upper seal portion 35a so as to be inclined toward the inner peripheral side as it approaches the upper side, and is formed in a flat surface shape. It is formed so as to come into contact with an inclined portion (shoulder portion) formed between the upper end portion and the outer peripheral portion of the container mouth tube portion 61 when the cap is attached. The second upper seal portion 35b is formed at an angle of 40 to 50° (more preferably 42 to 48°) with respect to the axial direction (vertical direction) of the cap 20. As shown in FIG.
As shown in FIG. 2, the inner peripheral surface of the first upper seal portion 35a and the inner peripheral surface of the second upper seal portion 35b are curved to form a concave shape toward the outer peripheral side. are smoothly connected by a smooth connecting surface.

As shown in FIG. 2, the downward extension region 36 has a gap on the outer peripheral side of the line forming region 61b of the container mouth tube portion 61 (in other words, the line including the parting line 63) in the state where the cap is attached. It has a lower side additional seal portion 36a arranged so as not to contact the outer peripheral surface of the formation region 61b.
In the present embodiment, as shown in FIG. 2, the inner peripheral surface of the lower additional seal portion 36a has a cross-sectional shape (a cross section when cut along a plane including the vertical direction as shown in FIG. 2) at the upper side portion. shape) is formed as a straight (or curved) part, and the lower part is formed as a curved part so that the cross-sectional shape is convex toward the lower side and the inner peripheral side. The lower portion also functions as a corner between the lower end and inner periphery of outer ring 34 .
The specific form of the lower side additional seal portion 36a is not limited to the above, and the cross-sectional shape of the inner peripheral surface may be curved, linear, or formed by combining curved lines and straight lines. , can be anything.

The lower side additional seal portion 36a is normal as shown in FIG. When the upper seal portions 35a and 35b of the container are in contact with each other), the container mouth portion 61 is positioned away from the outer peripheral surface of the line forming region 61b, but as shown in FIG. The top wall 31 swells in a dome shape due to the increase in pressure inside 60 , the outer ring 34 moves upward with respect to the container mouth tube portion 61 , and the upper seal portions 35 a and 35 b move to the container mouth tube portion 61 . When separated from the outer ring 34, the container mouth portion 61 and the outer ring 34 are formed to be in contact (adhered) with the line-unformed region 61a of the container mouth portion 61 over the entire circumferential direction of the cap to seal the container mouth portion 61 and the outer ring 34. ing.

Further, as shown in FIG. 2, the entire inner peripheral surface of the downward extension region 36 is formed so as to be inclined toward the outer diameter side as it goes downward.
Forming the inner peripheral surface of the lower extension region 36 at a slant in this manner facilitates demolding of the cap 20 during injection molding. After injection molding, the cap 20 can be easily removed from the mold (not shown).
A specific aspect of the lower extension region 36 is that the cross-sectional shape of the inner peripheral surface (the cross-sectional shape when cut along a plane including the vertical direction as shown in FIG. 2) is curved or linear. Any combination of curved lines and straight lines can be used.

As shown in FIG. 2, the inner peripheral surface of the outer ring 34 is curved to form a concave shape on the outer diameter side. It further has a connection inner peripheral surface 37 that connects the inner peripheral surface in the vertical direction.
The connecting inner peripheral surface 37 is curved so as to smoothly connect the inner peripheral surface of the first upper seal portion 35a and the inner peripheral surface of the lower additional seal portion 36a. It is possible to suppress the occurrence of cracks.
3, in which the first upper seal portion 35a is in contact with the container mouth tube portion 61, and the lower additional seal portion 36a is in contact with the container mouth tube portion 61. FIG. It is possible to smoothly transition to the state of 4.
The connection inner peripheral surface 37 may be formed so that the cross-sectional shape (the cross-sectional shape when cut along a plane including the vertical direction as shown in FIG. 2) is linear.

As shown in FIG. 1, the TE band 40 includes an annular band main body 41, which is connected to the lower end of the band main body 41 and is folded upward on the inner peripheral side of the band main body 41 so that the cap is attached. It has a flap 42 engageable from below on a container flange (not shown).
A plurality of flaps 42 are formed along the circumferential direction of the cap at intervals.

The weakened portion 50 is, as shown in FIG. 1 , a breakable annular portion that connects the lower end of the skirt wall 32 of the cap body 30 and the upper end of the band body portion 41 of the TE band 40 . In this embodiment, the weakened portion 50 is composed of a plurality of bridges and slits alternately formed in the circumferential direction of the cap. Note that the weakened portion 50 may have any specific form as long as it is provided so as to be breakable.

A parting line 63 is formed on the outer peripheral surface of the container 60 .
The parting line 63 is formed as a trace of the mating surfaces of the mold used to mold the container 60, and is formed due to misalignment of the molds on the mating surfaces.
Specific forms of the parting line 63 include a stepped line extending in the vertical direction (the axial direction of the container 60) as shown in FIG. As shown in b), there is a stepped shape extending along the circumferential direction of the container mouth tube portion 61, and a not-shown stepped portion extending along the vertical direction (the axial direction of the container 60) from the outer peripheral surface of the container 60 to the outer peripheral side. A projecting protrusion (burr) may be used.
9(a) and 9(b), the steps of the parting line 63 are greatly exaggerated.
Further, in this embodiment, the container 60 is formed by blow molding a preform (not shown), which is a preform, and the parting line 63 of this embodiment is formed using a molding die. It was formed in the step of injection molding a reform (not shown).

As shown in FIG. 2, the container mouth portion 61 has a line non-formation region 61a on the upper end side where the parting line 63 is not formed on the outer peripheral surface thereof, and a region below the line non-formation region 61a. and a lower line forming region 61b in which a parting line 63 is formed on the outer peripheral surface thereof.

Next, the contact state of the outer ring 34 with the container mouth tube portion 61 in this embodiment will be described below with reference to FIGS. 2 to 4. FIG.

First, as shown in FIG. 2, in the normal state in which the cap is attached (when the top wall 31 is not elastically deformed into a dome shape due to an increase in internal pressure in the container 60), the first upper seal portion 35a and the second seal portion 35a The upper seal portion 35b is in contact with the line non-formation region 61a of the container mouth portion 61. As shown in FIG.
Further, the lower additional seal portion 36 a is arranged at a position away from the outer peripheral surface of the line forming region 61 b of the container mouth tube portion 61 .
Here, if the lower side additional seal portion 36a is in contact so as to straddle the line non-formed region 61a and the line formed region 61b, or is in contact only with the line formed region 61b, the above-described burr (parting line 63), there is a risk of leakage from a slight gap.

Next, as shown in FIG. 3, when the top wall 31 is elastically deformed into a dome shape due to an increase in internal pressure in the container 60 with the cap 20 attached to the container mouth portion 61, the container mouth portion 61 is deformed. On the other hand, the outer ring 34 moves upward, and first, the second upper seal portion 35b is separated from the container mouth tubular portion 61. As shown in FIG.
Here, when the top wall 31 is elastically deformed into a dome shape, as shown in FIGS. , the outer ring 34 (and the inner ring 33) are tilted such that the lower end thereof is closer to the inner peripheral side than in the normal state shown in FIG.
Further, in the state shown in FIG. 3 , the lower additional seal portion 36 a is still separated from the outer peripheral surface of the line forming region 61 b of the container mouth tube portion 61 .

Next, as shown in FIG. 4, when the internal pressure of the container 60 further increases from the state shown in FIG. The seal portion 35 a separates from the container mouth portion 61 , and the lower additional seal portion 36 a comes into contact with the line forming region 61 b of the container mouth portion 61 .

Here, in this embodiment, from the state in which the first upper seal portion 35a is in contact with the container mouth portion 61 shown in FIG. Both of the side additional seal portions 36a are brought into contact with each other, and then the lower side additional seal portion 36a is brought into contact with the container mouth tube portion 61 shown in FIG.
However, from the state in which the first upper seal portion 35a is in contact with the tubular mouth portion 61 shown in FIG. It may be configured such that both of them are not in contact with each other, and then the lower additional seal portion 36a is in contact with the container mouth portion 61 shown in FIG. The lower additional seal portion 36a may come into contact with the container mouth tube portion 61 at the same time when the first upper seal portion 35a is separated from the container opening portion 61. As shown in FIG.
Note that the above description focused on the contact state of the first upper seal portion 35a and the lower additional seal portion 36a with the container mouth tube portion 61, but the first upper seal portion 35a and the lower additional seal portion 36a The connection inner peripheral surface 37 formed between The connection inner peripheral surface 37 may be prevented from contacting.

Next, a capped container 10 according to a second embodiment of the present invention will be described with reference to FIGS. 5 to 8. FIG. Here, since the second embodiment is exactly the same as the first embodiment described above except for a part of the configuration, the description of the configuration other than the difference will be omitted.

First, in the above-described first embodiment, the upper region 35 of the outer ring 34 serves as the upper seal portion that contacts the container mouth tubular portion 61, as shown in FIG. It has been described as having two upper seal portions 35b.
In contrast, in the second embodiment, the outer ring 34 is not provided with the second upper seal portion 35b, and instead, as shown in FIG. , is formed to protrude downward from the top wall 31, and in a state where the cap is attached, is in close contact with the upper end surface of the container mouth portion 61, and extends between the top wall 31 and the container mouth portion 61 over the entire circumference of the cap in the circumferential direction. A third sealing portion 38 is provided for sealing.

In such a second embodiment, as shown in FIG. 7, when the top wall 31 is elastically deformed into a dome shape due to an increase in internal pressure in the container 60 with the cap 20 attached to the container mouth portion 61, The third seal portion 38 separates from the tubular mouth portion 61 before the second upper seal portion 35 b separates from the tubular mouth portion 61 .

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the present invention described in the claims. It is possible.

For example, in the above-described embodiment, the cap 20 has been described as including the cap body 30 and the TE band 40 connected to the lower end of the cap body 30 via the weakened portion 50. can be anything that has an outer ring 34 .

DESCRIPTION OF SYMBOLS 10... Container with a cap 20... Cap 30... Cap main body 31... Top wall 32... Skirt wall 32a... Knurl part 32b... Cap-side screw part 33... Inner ring Reference numeral 34: Outer ring 35: Upper region 35a: First upper seal portion 35b: Second upper seal portion 36: Lower extension region 36a: Additional lower seal portion 37... Connection inner peripheral surface 38... Third seal part 40... TE band 41... Band body part 42... Flap 50... Weakening part 60... Container 61... Container Mouth tube portion 61a Line non-formed region 61b Line formed region 62 Container side screw portion 63 Parting line

Claims (7)

A capped container comprising a container having a container mouth portion and a cap attached to the container mouth portion,
The container mouth part has a line-unformed area where no parting line is formed on its outer peripheral surface, and a line where a parting line is formed on its outer peripheral surface in an area below the line-unformed area. a formation region;
The cap includes a top surface wall and an outer ring that protrudes downward from the top surface wall and is arranged on the outer peripheral side of the container mouth portion in a state in which the cap is attached to the container mouth portion. and
The outer ring is formed in an upper region having an upper seal portion that contacts the line non-formed region in the cap mounted state, and a lower side of the upper region, and the line formed region in the cap mounted state. and a lower extension region having a lower additional sealing portion arranged with a gap on the outer peripheral side of the cap. The lower additional seal portion attaches the cap to the container mouth tube portion, and the outer ring moves upward with respect to the container mouth tube portion so that the upper seal portion is attached to the container mouth. 2. The capped container according to claim 1, wherein the capped container is formed so as to come into contact with the line-unformed region in a state separated from the cylindrical portion. 3. The inner peripheral surface of the lower additional seal portion has curved portions that are convex toward the lower side and the inner peripheral side. container with cap. The inner peripheral surface of the outer ring is formed so as to be concave on the outer diameter side, and has a connection inner peripheral surface that connects the inner peripheral surface of the upper seal portion and the inner peripheral surface of the lower additional seal portion, 4. The capped container according to any one of claims 1 to 3, comprising: The outer ring has a connection inner peripheral surface that is curved so as to smoothly connect the inner peripheral surface of the upper seal portion and the inner peripheral surface of the lower additional seal portion. The capped container according to any one of claims 1 to 4. 6. The capped container according to any one of claims 1 to 5, wherein the inner peripheral surface of the downward extension region is formed to be inclined toward the outer diameter side as it goes downward. . A container mouth having a line-unformed region in which no parting line is formed on the outer peripheral surface thereof and a line-formed region below the line-unformed region in which a parting line is formed in the outer peripheral surface thereof. A cap attached to the barrel,
The cap includes a top surface wall and an outer ring that protrudes downward from the top surface wall and is arranged on the outer peripheral side of the container mouth portion in a state in which the cap is attached to the container mouth portion. and
The outer ring is formed in an upper region having an upper seal portion that contacts the line non-formed region in the cap mounted state, and a lower side of the upper region, and the line formed region in the cap mounted state. and a lower extension region having a lower additional seal portion arranged with a gap on the outer peripheral side of the cap.

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