WO2017017892A1

WO2017017892A1 - Container opening structure and container

Info

Publication number: WO2017017892A1
Application number: PCT/JP2016/003086
Authority: WO
Inventors: 哲人宮崎; 吉弘　憲司; 英明染谷; 規子三沢; 武志磯部; 尚杉山; 篤渡部
Original assignee: 東洋製罐株式会社
Priority date: 2015-07-24
Filing date: 2016-06-27
Publication date: 2017-02-02
Also published as: CN107709176B; CN107709176A; JP2017024769A; JP6715580B2

Abstract

The present invention ensures high sealing performance even if a container receives a strong impact or is filled with high-temperature contents. A container opening (10) of a container main body (1) has, in order from an opening end (10a) side: a first outer circumferential section (11) that protrudes towards to the outer circumferential side of the container opening (10) and comes in contact with an inner surface (34a) of an outer cylindrical section (34) of a lid (2); an inner circumferential section (13) that protrudes towards the inner circumferential side of the container opening (10), is in close contact with the entire perimeter of the outer surface (35a) of an inner cylindrical section (35) of the lid (2), and forms a sealed section (S); and a second outer circumferential section (12) that protrudes towards the outer circumference of the container opening (10) and comes in contact with the inner surface (34a) of the outer cylindrical section (34). The second outer circumferential section (12) has a stepped section (12a) on the opposite side to the opening end (10a) side and engaged with a first protrusion (37) in the inner surface (34a) of the outer cylindrical section (34). A section (U) of the container opening (10) from the first outer circumferential section (11) via the inner circumferential section (13) to the second outer circumferential section (12) has a U-shape that is curved towards the inner circumferential side of the container opening (10), in a cross-section including a center axial line of the container opening (10), such that the inner circumferential section (13) presses the outer surface (35a) of the inner cylindrical section (35).

Description

Container mouth structure and container

The present invention relates to a container mouth structure and a container. More specifically, the present invention relates to a container mouth structure of a synthetic resin container body that fits into a lid, and a container body and a lid having such a container mouth structure. And a container composed of

In recent years, bottle-shaped synthetic resin containers filled and sealed with contents such as food, which can be sealed again after being opened, are widely used. An example of such a container is described in Patent Document 1 below.

FIG. 5 shows a cross-sectional view of the main part of a conventional container. A container 100b shown in FIG. 5 includes a container body 101 made of a synthetic resin and a lid body 102 fitted to the container body 101. The lid body 102 has an inner plug 103 and a hinge 105 on the inner plug 103. It is comprised from the upper cover 104 connected through opening and closing.

When opening the container 100b, by pulling the pull ring 130 of the inner plug 103, the opening portion 131b surrounded by the score 131a at the center of the partition 131 is removed, and the inner plug 103 is opened. In addition, even after removing the opening portion 131b, the container 100b can be sealed again by closing the upper lid 104. When the upper lid 104 is closed, the peripheral wall portion 142 extending downward from the periphery of the top plate portion 141 of the upper lid 104 and the annular locking portion 132 of the inner plug 103 are engaged, and the inner ring extending downward from the top plate portion 141. 143 and the extraction pipe | tube 133 extended upwards from the partition part 131 of the inner stopper 103 closely_contact | adhere over the perimeter.

The lid 102 is driven and fitted into the container main body 101, and the container 102 is inserted into the annular groove 136 between the outer cylindrical portion 134 and the inner cylindrical portion 135 extending downward from the partition portion 131 of the inner plug 103 of the lid 102. The container mouth part 110 of the main body 101 is inserted. The container mouth part 110 has an outer peripheral part 111 projecting to the outer peripheral side of the container mouth part 110 in the immediate vicinity of the opening end 110 a, and this outer peripheral part 111 is formed on the inner surface 134 a of the outer cylindrical part 134 of the inner plug 103. Engage with the protruding portion (undercut) 134b. Thereby, the outer peripheral part 111 is latched by the outer cylindrical part 134, and a fitting state is hold | maintained.

An inner peripheral portion 112 projecting to the inner peripheral side of the container mouth portion 110 is formed below the outer peripheral portion 111 of the container mouth portion 110. When the container mouth portion 110 is fitted into the annular groove 136 of the lid body 102, the inner peripheral portion 112 presses the outer surface 135a of the inner cylindrical portion 135 over the entire periphery, and comes into close contact with the entire periphery of the outer surface 135a. This close part forms a seal part (S), and the container 100b is sealed. In FIG. 5, the container mouth part 110 and the inner cylindrical part 135 are shown to overlap each other.

When filling and sealing contents such as food in such containers, the container body is usually filled with contents heated to a temperature close to 70 ° C., for example, and then a lid is driven into the container mouth of the container body. The container mouth is turned over to fill the inside of the container mouth with the contents, and the inside of the container mouth serving as the head space and the inner surface of the lid body are also heat sterilized.

JP 2000-327002 A

Incidentally, in the conventional example shown in FIG. 5, only the outer peripheral portion 111 located deeper in the annular groove 136 than the inner peripheral portion 112 forming the seal portion is locked by the protruding portion (undercut) 134b. For this reason, when a strong impact is applied to the container after the contents are filled, the position of the inner peripheral portion 112 that forms the seal portion (S) by pressing the inner cylindrical portion 135 of the lid body is the annular groove 136. There is a risk of temporary shift in As a result, the container mouth part may be temporarily deformed and the sealing performance of the seal part (S) may be reduced. For this reason, even when a container receives a strong impact, development of the container which can ensure still higher sealing performance has been desired.

Also, in order to thoroughly improve the food safety through thorough heat sterilization, it is desirable to raise the heating temperature of the contents filled in the container. However, if the contents heated to a higher temperature (for example, a temperature close to 80 ° C.) are filled and sealed, the pressure difference between the inside and outside of the container after cooling the contents becomes larger, and the container receives a strong impact. The possibility that the sealing performance of S) is lowered is further increased. For this reason, there has been a demand for the development of a container that can ensure hermeticity even when a higher temperature content is filled.

The present invention has been made in view of the above circumstances, and a container mouth structure capable of ensuring higher sealing performance even when a container is subjected to a strong impact or even filled with a high-temperature content. And to provide containers.

In order to achieve the above object, the container mouth structure of the present invention has an annular groove between the outer cylindrical portion and the inner cylindrical portion of the lid body having an outer cylindrical portion with an inner surface protruding portion and an inner cylindrical portion. A structure of a synthetic resin container mouth portion to be inserted, and in order from the opening end side of the container mouth portion, the first projecting to the outer peripheral side of the container mouth portion so as to contact the inner surface of the outer cylindrical portion The inner peripheral portion projecting toward the inner peripheral side of the container mouth portion and the inner surface of the outer cylindrical portion are in contact with the outer peripheral portion so as to form a seal portion in close contact with the entire outer periphery of the inner cylindrical portion. A second outer peripheral portion projecting to the outer peripheral side of the container mouth portion, and the second outer peripheral portion engages with the first protrusion on the inner surface of the outer cylindrical portion. There is a stepped portion on the opposite side of the end side, and the front from the first outer peripheral portion so that the inner peripheral portion presses the outer surface of the inner cylindrical portion. Portion extending into the inner peripheral portion via the second outer peripheral portion in a cross section including the center axis of the container mouth portion is characterized by having a curved shape curved toward the inner peripheral side of the container mouth part.

Thus, according to the container mouth part structure of the present invention, the section of the container mouth part extending from the first outer peripheral part to the second outer peripheral part through the inner peripheral part is curved toward the inner peripheral side of the container mouth part. It has a curved shape (for example, a U shape, a C shape, or a V shape). Then, when the container mouth portion is fitted into the annular groove between the outer cylindrical portion and the inner cylindrical portion of the lid body, the first and second outer peripheral portions of the container mouth portion are inscribed in the outer cylindrical portion of the lid body. In addition, the inner peripheral portion located at the top of the curved shape between the two portions is firmly pressed against the inner cylindrical portion of the lid body and fixed at three points. Sex can be secured.

In addition, when the container mouth portion is fitted into the annular groove, the stepped portion of the second outer peripheral portion located at a shallower position of the annular groove than the inner peripheral portion forming the seal portion is an inner surface protruding portion on the inner surface of the outer cylindrical portion ( The second outer peripheral portion is locked by the inner surface protruding portion. For this reason, even when the container receives an impact, the second outer peripheral portion is prevented from moving in the direction of exiting the annular groove, and the occurrence of rattling of the lid is prevented. As a result, even at the time of impact, the three-point fixation is maintained, and the inner peripheral portion that forms the seal portion is continuously pressed against the inner cylindrical portion of the lid, so that high sealability of the seal portion can be ensured.

Furthermore, according to the container mouth portion structure of the present invention, the inner peripheral portion forming the seal portion is strongly pressed against the inner cylindrical portion of the lid body when fitted. For this reason, even when the pressure difference between the inside and outside of the container becomes large after filling and cooling the contents at a higher temperature (for example, a temperature close to 80 ° C.), the sealability of the seal portion can be ensured.
Thus, according to this invention, the high sealing performance of the seal part formed in the close part of an inner peripheral part and an inner cylindrical part at the time of insertion can be ensured.

The container of the present invention is a container composed of a lid body and a synthetic resin container body that are fitted to each other, the lid body having an outer cylindrical portion and an inner cylindrical portion, and A first protrusion on an inner surface of the outer cylindrical portion, and the container body has a container mouth portion fitted in an annular groove between the outer cylindrical portion and the inner cylindrical portion of the lid, The mouth portion, in order from the opening end side, projects to the outer peripheral side of the container mouth portion, the first outer peripheral portion contacting the inner surface of the outer cylindrical portion, and the inner end projecting to the inner peripheral side of the container mouth portion, An inner peripheral portion that forms a seal portion in close contact with the entire outer periphery of the cylindrical portion, and a second outer peripheral portion that projects to the outer peripheral side of the container mouth portion and contacts the inner surface of the outer cylindrical portion when fitted. The second outer peripheral portion has a stepped portion engaged with the first projecting portion on the side opposite to the opening end side, and the inner peripheral portion of the inner cylindrical portion is A portion of the container mouth extending from the first outer peripheral portion through the inner peripheral portion to the second outer peripheral portion so as to press the surface, in the cross section including the central axis of the container mouth portion, the container mouth portion It is characterized by having a curved shape curved toward the inner peripheral side.

According to the container of the present invention, the cross-section of the portion of the container mouth extending from the first outer periphery to the second outer periphery through the inner periphery is curved to the inner periphery of the container mouth (for example, U-shape, C-shape, or V-shape). Therefore, the first and second outer peripheral portions inscribed in the outer cylindrical portion of the lid are fixed, and the inner peripheral portion located at the top of the curved portion between the two locations is the inner portion of the lid. Since the cylindrical portion is strongly pressed and fixed at three points, high sealing performance of the seal portion can be ensured.

In addition, the step portion of the second outer peripheral portion located at a shallower position of the annular groove than the inner peripheral portion forming the seal portion engages with the first protrusion (undercut) on the inner surface of the outer cylindrical portion of the lid, The second outer peripheral portion is locked by the first protrusion. For this reason, even when the container receives an impact, the second outer peripheral portion is prevented from moving in the direction of exiting the annular groove, and the occurrence of rattling of the lid is prevented. As a result, even at the time of impact, the three-point fixation is maintained, and the inner peripheral portion that forms the seal portion is continuously pressed against the inner cylindrical portion of the lid, so that high sealability of the seal portion can be ensured.

Furthermore, according to the container of the present invention, since the inner peripheral portion located at the top of the curved shape of the container mouth is strongly pressed against the inner cylindrical portion of the lid, the content is higher (for example, a temperature close to 80 ° C.). Even when the pressure difference between the inside and outside of the container becomes large after filling and cooling the object, the sealing performance of the seal portion can be ensured.

Preferably, in the present invention, the lid body may have a second protrusion that engages with the second outer peripheral portion from the opening end side on the inner surface of the outer cylindrical portion.

Thus, the second outer peripheral portion is locked from the opening end side by the second protrusion. In particular, the second outer peripheral portion is firmly fixed to the outer cylindrical portion by being locked by both the first protrusion and the second protrusion. For this reason, even when the container receives an impact, the movement of the second outer peripheral portion is prevented, and the occurrence of rattling of the lid is prevented.

Also in the present invention, it is preferable that the lid body has a third protrusion portion that engages with the first outer peripheral portion from the opening end side on the inner surface of the outer cylindrical portion.

If a third protrusion engaging with the first outer peripheral portion from the opening end side is provided on the inner surface of the outer cylindrical portion of the lid body, particularly the shoulder portion of the first outer peripheral portion engages with the third protrusion. And a 1st outer peripheral part is latched by the 3rd projection part. For this reason, even when the container receives an impact, the movement of the first outer peripheral portion to the back of the annular groove is prevented, and the occurrence of rattling of the lid is prevented. As a result, even at the time of impact, the curved shape is maintained, and the inner peripheral portion located at the top of the curved shape continues to be strongly pressed against the inner cylindrical portion of the lid, and the sealing performance of the seal portion is ensured.

In particular, if the first outer peripheral portion is locked by the third projecting portion and the step portion of the second outer peripheral portion is locked by the first projecting portion, the curved shape is more firmly maintained even during an impact. The As a result, the inner peripheral portion located at the top of the curved shape continues to be strongly pressed against the inner cylindrical portion of the lid, and the sealing performance of the seal portion is further ensured.

In the present invention, preferably, at least a part of the seal portion is in a range of 2.25 to 5.70 mm, more preferably 3.65 to 4.35 mm from the opening end of the container mouth portion of the container body. It is good to be formed inside.

If the seal portion is provided within such a range, the inner peripheral portion presses the inner cylindrical portion near the base of the inner cylindrical portion of the lid. As a result, the amount of deformation of the inner cylindrical portion is smaller than when the inner peripheral portion presses near the tip of the inner cylindrical portion, and the inner peripheral portion of the container mouth portion presses the inner cylindrical portion of the lid more strongly. Further, the sealing performance of the seal portion can be further improved.

According to the container mouth structure and the container of the present invention, the inner peripheral portion of the container mouth and the inner cylindrical portion of the lid are in close contact with each other even when the container receives a strong impact or is filled with high-temperature contents. High sealability can be ensured in the seal portion formed in the part.

FIG. 1: shows the partially notched side view of the container opening part of 1st Embodiment of this invention. FIG. 2 (a) is a top view of an open hinge-type lid constituting the container of the first embodiment of the present invention, and FIG. 2 (b) is a cross-sectional view taken along the line bb of FIG. 2 (a). (C) shows a bottom view. FIG. 3 shows a cross-sectional view of a main part of the container according to the first embodiment of the present invention. FIG. 4 shows a partially cutaway side view of a container according to a second embodiment of the present invention. FIG. 5 shows a cross-sectional view of a main part of a conventional container.

Hereinafter, embodiments of the container mouth structure and the container of the present invention will be described with reference to the drawings.
(First embodiment)
The container of 1st Embodiment is comprised from the hinged cover body and the container main body.
First, the container mouth structure of the container body will be described with reference to FIG. FIG. 1 is a partially cutaway side view of the container mouth 10. The container body 1 in this embodiment is directly blow-molded from a synthetic resin material such as polypropylene (PP) or polyethylene (PE), and the container mouth 10 is substantially constant as shown in the left cross-sectional view of FIG. Have a wall thickness of

In the container mouth 10 of the container body 1, a first outer peripheral portion 11 projecting from the opening end 10 a side of the container mouth portion 10 to the outer peripheral side of the container mouth portion 10 and an inner peripheral side of the container mouth portion 10 are projected. Further, an inner peripheral portion 13 and a second outer peripheral portion 12 projecting to the outer peripheral side of the container mouth portion 10 are provided. And, as shown in the cross-sectional view on the left side of FIG. 1, the section (U) from the first outer peripheral portion 11 to the second outer peripheral portion 12 through the inner peripheral portion 13 includes the central axis A of the container mouth portion. A curved shape that curves toward the inner peripheral side of the container mouth portion 10, which is a U-shape in this embodiment. Further, a step portion 12a is formed on the second outer peripheral portion 12 on the side opposite to the opening end 10a side.

Next, referring to FIG. 2, a lid 2 that is driven into the container body 1 and fits into the container body 1 is shown. 2A is a top view of the hinge-type lid in the opened state, FIG. 2B is a cross-sectional view taken along the line bb of FIG. 2A, and FIG. 2C is a bottom view. It is.

The lid 2 is composed of an inner plug 3 and an upper lid 4 that is connected to the inner plug 3 through a hinge 5 so as to be opened and closed. By pulling the pull ring 30 of the inner plug 3, the opening portion 31b surrounded by the score 31a at the center of the partition portion 31 is removed, and the inner plug 3 is opened. Further, when the upper lid 4 is closed, the peripheral wall portion 42 extending downward from the periphery of the top plate portion 41 of the upper lid 4 and the annular locking portion 32 of the inner plug 3 are engaged and also extended downward from the top plate portion 41. The outer surface of the inner ring 43 and the inner surface of the extraction tube 33 extending upward from the partition portion 31 of the inner plug 3 are in close contact with each other over the entire circumference. Therefore, the container 100 can be sealed again by closing the upper lid 4 even after the removal of the opening portion 31b.

The inner plug 3 of the lid 2 is formed with an outer cylindrical portion 34 and an inner cylindrical portion 35 that extend downward from the partition portion 31. The outer cylindrical portion 34 has a first protrusion (inner protrusion) 37 on the inner surface 34a, and the inner cylindrical portion 35 has a straight surface depending on the outer surface 35a. When the lid body 2 is driven into and fitted into the container body 1, the container mouth portion 10 of the container body 1 is inserted into the annular groove 36 between the outer cylindrical portion 34 and the inner cylindrical portion 35 of the lid body 2. Is inserted.
The outer cylindrical portion 34 preferably has a second protruding portion 38 and a third protruding portion 39 on the inner surface 34a.

Hereinafter, the container 100 in which the container main body 1 and the lid body 2 are fitted will be described with reference to FIG. 3. FIG. 3 is a cross-sectional view of a main part of the container of the present embodiment.
The first outer peripheral portion 11 and the second outer peripheral portion 12 of the container mouth portion 10 fitted in the annular groove 36 are in contact with the inner surface 34 a of the outer cylindrical portion 34 of the lid body 2, and the inner peripheral portion 13 of the container mouth portion 10. Is in close contact with the entire circumference of the outer surface 35a of the inner cylindrical portion 35, and as a result, the container mouth portion 10, the outer cylindrical portion 34 and the inner cylindrical portion 35 are pressed against each other.
In FIG. 3, the container mouth portion 10, the outer cylindrical portion 34, and the inner cylindrical portion 35 are illustrated so as to overlap each other.

The curved U-shaped portion (U) extending from the first outer peripheral portion 11 through the inner peripheral portion 13 to the second outer peripheral portion 12 strongly presses the outer surface 35a of the inner cylindrical portion 35. As a result, a seal portion (S) with high sealing performance is formed at the close contact portion between the inner peripheral portion 13 and the inner cylindrical portion 35.

Further, the stepped portion 12a of the second outer peripheral portion 12 engages with a first protrusion (undercut) 37 formed on the entire circumference of the inner surface 34a of the outer cylindrical portion 34, and the second outer peripheral portion 12 is opened to the open end 10a. Since the second outer peripheral portion 12 is locked from the opposite side, the second outer peripheral portion 12 is prevented from moving in the direction of exiting the annular groove 36 (downward in FIG. 3).

The second outer peripheral portion 12 is also engaged with a second protrusion 38 formed on the inner surface 34 a of the outer cylindrical portion 34. Thereby, the 2nd outer peripheral part 12 is latched also from the opening end 10a side, and it is also prevented that the 2nd outer peripheral part 12 moves to the back (upward direction of FIG. 3) of the annular groove 36.
In addition, the 2nd projection part 38 may be provided continuously over the perimeter of the outer cylindrical part 34, and may be provided in part intermittently.

Thus, the second outer peripheral portion 12 is firmly fixed to the outer cylindrical portion 34 by the second outer peripheral portion 12 being locked by both the first projecting portion 37 and the second projecting portion 38. For this reason, even when the container 100 receives an impact, the movement of the second outer peripheral portion 12 is prevented, and the occurrence of rattling of the lid 2 is prevented. As described above, the second outer peripheral portion 12 located in a shallower position of the annular groove 36 than the inner peripheral portion 13 that forms the seal portion (S) in the container mouth portion 10 is locked. Also, the U-shaped part (U) is maintained. As a result, the inner peripheral portion 13 located at the top of the U-shape continues to be strongly pressed against the inner cylindrical portion 35 of the lid body 2, and the sealing performance of the seal portion (S) is ensured.

Further, since the inner peripheral portion 13 strongly presses the outer surface 35a of the inner cylindrical portion 35, and a tightly sealed portion (S) is formed in the close contact portion between the inner peripheral portion 13 and the inner cylindrical portion 35, Even when the pressure difference between the inside and outside of the container 100 becomes large after the contents filled with the container 100 at a high temperature (for example, a temperature close to 80 ° C.) are cooled, it is possible to ensure high sealing performance of the seal portion (S). it can.

Furthermore, the 1st outer peripheral part 11 is also latched from the opening end 10a side by engaging with the 3rd projection part 39 formed in the inner surface 34a of the outer cylindrical part 34. FIG. Thereby, the 1st outer peripheral part 11 is prevented from moving to the back (upward direction of FIG. 3) of the annular groove 36. As a result, even when the container receives an impact, the movement of the first outer peripheral portion 11 to the back of the annular groove 36 is prevented, and the occurrence of rattling of the lid 2 is prevented.
In addition, the 3rd protrusion part 39 may be provided continuously over the perimeter of the outer cylindrical part 34, and may be provided intermittently in part.

In this way, the two portions of the first outer peripheral portion 11 and the second outer peripheral portion 12 inscribed in the outer cylindrical portion 34 of the lid 2 are firmly locked, and a U-shaped portion (U ) Is strongly pressed against the inner cylindrical portion 35 of the lid 2. As a result, even during an impact, the U-shaped portion (U) is maintained, and the inner peripheral portion 13 located at the top of the U-shape continues to be strongly pressed against the inner cylindrical portion 35 of the lid body 2, and the seal portion ( The sealing property of S) is further ensured.

Further, the portion where the inner peripheral portion 13 of the container mouth portion 10 is in close contact with the outer surface 35a of the inner cylindrical portion 35 of the lid 2 is closer to the root of the inner cylindrical portion 35, that is, closer to the partition portion 31 of the inner plug 3. The inner cylindrical portion 35 is not easily deformed, and the pressing force by the inner peripheral portion 13 is increased. For this purpose, at least a part (preferably all) of the seal part (S) is 2.25 to 5.70 mm from the open end 10a of the container mouth part 10 of the container body 1, more preferably 3.65 to 4. It is good to form within the range of 35 mm. As a result, the inner peripheral portion 13 presses near the root of the inner cylindrical portion 35. As a result, the pressing force by the inner peripheral part 13 becomes high, and the sealing performance of the seal part (S) is improved. In particular, when filling the contents at a higher temperature (for example, a temperature close to 80 ° C.), even when the inner cylindrical portion 35 of the lid body 2 is softened due to the high temperature, the sealing performance of the seal portion (S) is further ensured. Can do.

(Second Embodiment)
Next, the container of 2nd Embodiment is demonstrated with reference to FIG. FIG. 4 is a partially cutaway side view of the container of the second embodiment.
The container 100a of 2nd Embodiment is comprised from the container main body 1 and the screw-type cover body 2a. Since the structure of the container body 1 is the same as that of the first embodiment, its detailed description is omitted. Further, the description of the same structure as that of the first embodiment is omitted for the inner plug 3a.

The lid 2a is composed of an inner plug 3a and an upper lid (screw cap) 6. The upper lid (screw cap) 6 has a bottomed cylindrical shape having a top plate portion 61 and a peripheral wall portion 62 extending downward from the periphery of the top plate portion 61. By screwing the upper lid (screw cap) 6 into the inner plug 3a, the thread groove 62a on the inner periphery of the peripheral wall portion 62 of the upper lid (screw cap) 6 and the screw of the threaded cylindrical portion 32a of the inner plug 3a are screwed together. At the same time, the inner ring 63 extending downward from the top plate portion 61 of the upper lid (screw cap) 6 and the dispensing cylinder 33a extending upward from the partition portion 31 of the inner plug 3 are in close contact with each other over the entire circumference. Thereby, the container 100a can be sealed again by closing the upper lid (screw cap) 6 even after the container 100a is opened.

Also in the second embodiment, the container mouth portion 10 is fitted into the annular groove 36 between the outer cylindrical portion 34 and the inner cylindrical portion 35 extending downward from the partition portion 31 of the inner plug 3a of the lid 2a. Thus, the container body 1 and the lid 2a are fitted. As a result, as in the first embodiment, a highly sealable seal portion (S) is formed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, an example in which the curved shape of the cross section of the container mouth portion is a U shape has been described. However, in the present invention, the curved shape is not limited to this, for example, a C shape or a V shape. It is good also as a shape.
In the above-described embodiment, the example of the lid body including the upper lid and the inner plug has been described. However, in the present invention, the lid body that configures the container is not limited thereto, and any lid body that can be fitted to the container can be used. Good.
Moreover, although the example which formed the container mouth part in the top part of the container main body was demonstrated in embodiment mentioned above, a container mouth part is not limited to what was formed in the top part of a container main body, For example, the side surface of a container main body It may be formed.
In addition, the content filled in the container is not limited to food, and may be a fluid other than food, a semi-solid, a granule, or a powder.

The container mouth structure and the container according to the present invention can be suitably used in various containers used for beverages, medicines, etc., in addition to containers containing seasonings such as soy sauce, sauce, sauce, dressing, and cooking oil. Is possible.

All the contents of the documents described in this specification and the specification of the Japanese application that is the basis of Paris priority of this application are incorporated herein.

DESCRIPTION OF SYMBOLS 1

Container body

2,

2a Lid

3, 3a Middle plug 4 Top lid 5 Hinge 6 Top lid (screw cap)
DESCRIPTION OF SYMBOLS 10 Container mouth part 10a Open end 11 1st outer peripheral part 12 2nd outer peripheral part 12a Step part 13 Inner peripheral part 30 Pull ring 31 Partition part 31a Score 31b Opening part 32 Annular latching part 32a Screwing

cylinder part

33, 33a Tube 34 Outer cylindrical portion 34a Inner surface of outer cylindrical portion 35 Inner cylindrical portion 35a Outer surface of inner cylindrical portion 36 Annular groove 37 First protrusion (inner surface protrusion)
38 2nd projection part 39

3rd projection part

41, 61

Top plate part

42, 62

Peripheral wall part

43, 63 Inner ring

62a Screw groove

100, 100a, 100b Container U U-shaped part S Seal part

Claims

A structure of a synthetic resin container mouth portion that fits into an annular groove between the outer cylindrical portion and the inner cylindrical portion of the lid body having an outer cylindrical portion and an inner cylindrical portion with an inner protrusion,
In order from the opening end side of the container mouth,
A first outer peripheral portion projecting to the outer peripheral side of the container mouth portion so as to contact the inner surface of the outer cylindrical portion;
An inner peripheral portion projecting to the inner peripheral side of the container mouth portion so as to form a seal portion in close contact with the entire outer periphery of the inner cylindrical portion;
A second outer peripheral portion protruding to the outer peripheral side of the container mouth portion so as to contact the inner surface of the outer cylindrical portion;
The second outer peripheral portion has a stepped portion on the side opposite to the opening end side so as to engage with the first protrusion on the inner surface of the outer cylindrical portion,
In a cross section in which the portion from the first outer peripheral portion through the inner peripheral portion to the second outer peripheral portion includes the central axis of the container mouth so that the inner peripheral portion presses the outer surface of the inner cylindrical portion The container mouth part structure has a curved shape curved toward the inner peripheral side of the container mouth part.
A container composed of a lid body and a synthetic resin container body that are fitted together,
The lid has an outer cylindrical portion and an inner cylindrical portion, and has a first protrusion on the inner surface of the outer cylindrical portion,
The container body has a container mouth portion fitted in an annular groove between the outer cylindrical portion and the inner cylindrical portion of the lid,
The container mouth portion, in order from the opening end side,
Projecting to the outer peripheral side of the container mouth, and a first outer peripheral part in contact with the inner surface of the outer cylindrical part,
Projecting to the inner peripheral side of the container mouth portion, an inner peripheral portion forming a seal portion in close contact with the entire outer periphery of the inner cylindrical portion, and
Projecting to the outer peripheral side of the container mouth part, and having a second outer peripheral part in contact with the inner surface of the outer cylindrical part,
The second outer peripheral portion has a stepped portion engaged with the first protrusion on the opposite side of the opening end side,
The portion of the container mouth that extends from the first outer periphery to the second outer periphery so that the inner periphery presses the outer surface of the inner cylindrical portion is the center of the container mouth. A container having a curved shape curved toward the inner peripheral side of the container mouth portion in a cross section including an axis.
3. The container according to claim 2, wherein the lid body has a second protrusion that engages with the second outer peripheral portion from the opening end side on the inner surface of the outer cylindrical portion.
4. The container according to claim 2, wherein the lid body has a third projecting portion that engages with the first outer peripheral portion from the opening end side on the inner surface of the outer cylindrical portion. .
The at least part of the seal portion is formed within a range of 2.25 to 5.70 mm from the opening end of the container mouth portion of the container main body. The container according to item.