JP6664285B2 - Container lid and combination of container and container lid - Google Patents

Description

  The present invention relates to a container lid applied to a container having a laminated structure of a squeezable outer container layer and a squeezable inner container layer, and a laminated structure of a squeezable outer container layer and a squeezable inner container layer. And a combination of a container and a container lid.

  As disclosed in Patent Document 1 below, recently, as a container for a seasoning, particularly a soy sauce, the container has a laminated structure of a squeezable outer container layer and a squeezable inner container layer, and an outer container layer. In the mouth and neck, a container having an introduction hole for introducing outside air between the outer container layer and the inner container layer is widely used in practice. As a container lid for such a container, a container lid having a lid body having a closing wall and a mounting wall hanging down from an outer peripheral edge of the closing wall is used. A discharge opening is formed in the closing wall of the lid body, and a check valve for closing the discharge opening is provided. A separately molded seal piece is fixed to the lower portion of the inner peripheral surface of the mounting wall of the lid body, and a main portion of the seal piece has an annular shape extending radially inward from the lower portion of the inner peripheral surface of the mounting wall. And is flexible.

  When the lid body is attached to the mouth and neck of the container by fitting the mounting wall of the lid body to the mouth and neck of the container, the sealing piece of the lid body is formed on the outer peripheral surface of the mouth and neck of the outer container layer of the container. It is in close contact with a portion below the introduction hole. When the container is squeezed in order to discharge the contents in the container and the pressure in the container is made higher than the pressure outside the container by a predetermined value or more, the check valve is opened and the contents are discharged through the discharge opening. When the squeezing of the container is released, the container is elastically restored, the pressure between the outer container layer and the inner container layer is gradually reduced, and the pressure between the outer container layer and the inner container layer is lower than the pressure of the outside air. When it becomes smaller than the predetermined value, the sealing piece of the lid body separates from the outer peripheral surface of the mouth and neck of the outer container layer of the container, and outside air is introduced between the outer container layer and the inner container layer.

JP-A-10-45180

  Therefore, in the container lid and the combination of the container and the container lid as described above, the sealing piece of the lid main body is formed separately from the lid main body, and is fixed to a required portion of the inner peripheral surface of the mounting wall of the lid main body. However, there is a problem that the production of the container lid is relatively complicated and the production cost is relatively expensive. To further add to this point, forming an annular flexible seal integrally with the inner peripheral surface of the mounting wall in the radial direction from the lower portion of the inner peripheral surface of the mounting wall is a so-called so-called die-cutting after molding. The sealing pieces tended to be damaged due to forcing, and were generally considered impossible.

  The present invention has been made in view of the above facts, and a main technical problem is to damage a seal piece despite the fact that the seal piece is integrally formed on the inner peripheral surface of the mounting wall of the lid body. To provide a new and improved container lid which can be formed without any problems, and also to provide a combination of such a container lid and a container which is a laminated structure of a squeezable outer container layer and a squeezable inner container layer. It is to be.

  As a result of intensive studies, the present inventor has formed an annular flexible seal piece extending inward in the radial direction integrally on the inner peripheral surface of the mounting wall of the lid main body, and disposed of a discard piece located above the seal piece. It has been found that the main technical problem can be achieved by forming an undercut.

  As used herein, the phrase "undercut" is present behind the protrusion due to the protrusion, as viewed in the direction of movement of the container cover relative to the mold when removing the container lid from the mold. It means a space that creates a so-called forcing when removing the container lid from the mold. Also, the phrase "discard undercut" is not necessarily necessary in terms of the function of the container lid itself, but an undercut that exists to avoid or suppress undesired damage during molding is used. means.

According to the present invention, the as container closure for solving the principal object, and a cylindrical-shaped mounting wall depending from the outer peripheral edge of the closing wall and the closing wall, the discharge opening to the closing wall The check valve is formed and is provided with a check valve for closing the discharge opening, and the check valve is made of a synthetic resin which is opened when the pressure inside the closing wall becomes larger than the outside pressure by a predetermined value or more. A container lid comprising a lid body of
The inner peripheral surface of said mounting wall, with the sealing piece of annular flexible extending radially inwardly is formed integrally with undercut discarded located above the seal strip is formed A container lid is provided.

Preferably, the undercut Te該捨the plurality of arcuate circumferentially extending spaced ridges or circumferential direction of the annular integrally formed on the lower inner peripheral surface of said mounting wall above the said sealing piece It is stipulated by the ridge. The radially extending dimension of the ridge is preferably equal to or larger than the radially extending dimension of the sealing piece. It is desirable that the axial separation distance between the base end of the seal piece and the base end of the ridge is smaller than the radial extension of the seal piece. Conveniently, the sealing piece extends downwardly inwardly in the radial direction. A top wall and a skirt wall hanging down from an outer peripheral edge of the top wall; a lower end of the skirt wall is connected to an upper end of the mounting wall of the lid body via hinge means; Conveniently, there is provided an outer lid integrally formed with the lid body, which is pivotable between a closed position covering the closing wall of the main body and an open position exposing the closing wall.

Furthermore, according to the present invention, as a combination to achieve the main technical problem, a combination of a container and a container lid as described above,
The container has a laminated structure of a squeezable outer container layer and a squeezable inner container layer, and has a mouth and neck portion for introducing outside air between the outer container layer and the inner container layer. An introduction means is formed,
When the container lid is attached to the mouth and neck by fitting the mounting wall of the lid body to the mouth and neck of the container, the sealing piece of the lid body is attached to the outer container layer of the container. Closely attached to a portion of the outer peripheral surface of the mouth and neck below the introduction means,
The check valve is opened when the pressure in the inner container layer becomes larger than the pressure outside the container by a predetermined value or more,
Only when the pressure between the outer container layer and the inner container layer becomes smaller than the pressure of the outside air by a predetermined value or more, the sealing piece of the lid main body is removed from the outer peripheral surface of the mouth and neck portion of the outer container layer. Separated,
A combination is provided.

  On the outer peripheral surface of the mouth and neck portion of the outer container layer of the container, an annular protrusion located below the introduction means is formed, and the tip of the sealing piece of the lid main body is the annular member. Advantageously, it is closely attached to the upper surface of the projection.

  In the container lid and the container and the container lid configured according to the present invention, when the container lid is taken out from the mold, the portion where the sealing piece is present in the mounting wall of the lid main body due to the presence of the discarded undercut is in the radial direction. It is forced outwards, so that the so-called forced removal of the sealing piece is reduced, and damage to the sealing piece is avoided as much as possible.

1 is a partial sectional view showing a preferred embodiment of a combination of a container lid and a container configured according to the present invention. The bottom view of the container lid in the combination shown in FIG. The top view of the valve member which comprises the non-return valve arrange | positioned at the container lid in the combination shown in FIG. FIG. 4 is a front view of the valve member shown in FIG. 3. FIG. 4 is a bottom view of the valve member shown in FIG. 3. FIG. 2 is a partial cross-sectional view showing a behavior of a sealing piece of a container lid due to a change in pressure between an outer container layer and an inner container layer of the container in the combination shown in FIG. 1. FIG. 2 is a partial cross-sectional view showing a process of taking out from a mold used to form a lid main body of a container lid in the combination shown in FIG. 1.

  Hereinafter, preferred embodiments of a container lid and a combination of a container and a container lid configured according to the present invention will be described in more detail with reference to the accompanying drawings.

  First, the container will be described with reference to FIG. 1. The container indicated by reference numeral 2 is a laminated structure of a squeezable outer container layer 4 and a squeezable inner container layer 6. The container 2 has an outer preform with a base material (inner preform) for forming the inner container layer 6 preliminarily laminated inside a base material (outer preform) for forming the outer container layer 4. And the inner preform are blown together and co-extruded. The method of forming such a container 2 is well known, and for details, see, for example, Japanese Patent No. 2586294. The raw material of the outer container layer 4 is an appropriate synthetic resin such as high-density polyethylene, and the raw material of the inner container layer 6 is an appropriate synthetic resin such as nylon. It is advantageous that mutual adsorption force is hardly generated due to the above-mentioned factors, and the outer container layer 4 and the inner container layer 6 are easily peeled off.

  An introduction means 10 for introducing outside air is formed between the outer container layer 4 and the inner container layer 6 in the cylindrical mouth and neck portion 8 of the container 2. In the illustrated embodiment, the mouth-neck portion 8 is provided at the upper end of the outer container layer 4 having a bottomed cylindrical wall shape, and a plurality of introducing means 10 are provided at the mouth-neck portion 8 at circumferential intervals. It consists of small holes. The introduction means 10 is located below the lower end of the seal ring 34 formed on the closing wall when the container lid is mounted on the container 2 as described later. An annular locking ridge 12 located at the upper end and an annular projection 14 located below the introduction means 10 are formed on the outer peripheral surface of the mouth and neck portion 8. Below the annular projection 14, a known support ring 16 used for transporting the container is also formed. The inner container layer 6 has a bag shape with an open upper end, and the upper end of the outer peripheral surface is in close contact with the upper end of the inner peripheral surface of the outer container layer 4. If desired, the upper end of the inner container layer 6 is provided with a radially outwardly projecting annular projection, which is located above and engages the upper end of the outer container layer 4. Alternatively, the mouth and neck of the container 2 may be constituted by an annular projection of the inner container layer 6 together with the upper end of the outer container layer 4, and the introduction means 10 may be formed on the inner container layer 6.

  Next, the description of the container lid will be continued with reference to FIG. 1. The container lid indicated by reference numeral 18 is provided with a lid main body 20 that can be injection-molded or compression-molded from a suitable synthetic resin such as polyethylene or polypropylene. . The lid body 20 has a closing wall 22 and a cylindrical mounting wall 24 hanging down from the outer peripheral edge of the closing wall 22. The closing wall 22 connects the circular central region 22a, the annular outer peripheral region 22b located below the central region 22a, and the central region 22a and the outer peripheral region 22b, and the upper surface is directed downward in the radially outward direction. And an annular connection region 22c that is inclined. A circular discharge opening 26 is formed at the center of the central region 22a, and a guide wall 28 that extends around the outer peripheral edge of the discharge opening 26 is formed on the upper surface of the central region 22a. The main portion of the guide wall 28 has a substantially cylindrical shape, and a lip having a substantially semicircular cross section is provided at the upper end of the guide wall 28. A check valve 70, which will be described later, is provided below the central region 22a, and the discharge opening 26 is closed. A substantially cylindrical locking wall 30 is formed on the upper surface of the outer peripheral region 22b. The locking wall 30 is extended upward at a substantially middle position in the radial direction of the outer peripheral region 22b, and an annular locking ridge 32 projecting outward in the radial direction is formed at the upper end of the outer peripheral surface. A substantially cylindrical seal ring 34 is formed on the lower surface of the outer peripheral region 22b. The seal ring 34 hangs downward at a substantially intermediate position in the radial direction of the outer peripheral region 22b. A substantially cylindrical annular holding wall 36 is formed on the lower surface of the connection region 22c. At the lower end of the inner peripheral surface of the holding wall 36, an annular holding ridge 38 projecting inward in the radial direction is formed.

  With reference to FIG. 2 together with FIG. 1, a plurality of circumferentially spaced apart (six in the illustrated example) are provided at substantially intermediate positions in the axial direction on the inner peripheral surface of the mounting wall 24. ) Are formed. On the inner peripheral surface of the mounting wall 24, an annular flexible seal piece 42 extending inward in the radial direction is integrally formed, and a discarded undercut 44 located above the seal piece 42 is formed. It is important that they are formed. In the illustrated embodiment, the seal piece 42 is formed at the lower portion of the inner peripheral surface of the mounting wall 24, and the discarded undercut 44 is formed integrally with the lower portion of the inner peripheral surface of the mounting wall 24 above the seal piece 42. Is defined by the annular ridge 46. The undercut 48 is defined by the seal piece 42 itself. The cross section of the ridge 46 has a substantially arc shape that protrudes inward in the radial direction. Referring to FIG. 7 and FIG. 7C, it is preferable that the radial projection L1 of the ridge 46 is substantially the same as or slightly larger than the radial extension L2 of the seal piece 42. The axial separation dimension D between the base end of the seal piece 42 and the base end of the ridge 46 is smaller than the radial protrusion dimension L2 of the seal piece 42. The sealing piece 42 extends obliquely downward inward in the radial direction, and has an arc shape in a cross-sectional view. If desired, the discarded undercut 44 may be defined by a plurality of circumferentially spaced arcuate ridges.

  An outer lid 52 is connected to the upper end of the mounting wall 24 of the lid main body 20 via hinge means 50. The outer lid 52 is formed integrally with the lid main body 20 (therefore, the outer lid 52 is also made of a synthetic resin), and the closed position (the state shown by the solid line in FIG. 1) that covers the closed wall 22 of the lid main body 20 is closed. It is pivotable between an open position to be exposed (a state shown by a two-dot chain line in FIG. 1). The outer lid 52 has a top wall 54 and a skirt wall 56 hanging down from the outer peripheral edge of the top wall 54. On the inner surface of the top wall 54, a closing plug 58 extending downward at the center thereof, and an outer sealing piece 60 and an inner sealing piece 62 hanging downward outside the closing plug 58 are formed. The closure plug 58 has a solid rod shape. Both the outer seal piece 60 and the inner seal piece 62 have a substantially cylindrical shape. The inner seal piece 62 has a longer drooping length from the top wall 54 than the outer seal piece 60, and the closure plug 58 has a longer droop length from the top wall 54 than the inner seal piece 62. If desired, the closure plug 58 and the inner seal piece 62 may be integral. Between the inner seal piece 62 and the outer seal piece 60 on the inner surface of the top wall 54, when the outer lid 52 is turned from the closed position to the open position, the scattering of the content liquid attached to the inner surface of the top wall 54 is prevented. Annular groove 64 is formed. An annular locked ridge 66 is formed at the lower end of the inner peripheral surface of the skirt wall 56. On the lower side of the outer peripheral surface of the skirt wall 56 on the side opposite to the hinge means 50 in the diametrical direction, there is formed a flange 68 on which a finger can be hung when the outer lid 52 is swung.

  A check valve, generally designated by the numeral 70, is also provided on the container lid 18 constructed in accordance with the present invention. The check valve 70 includes a valve member 72 and a holding member 74. Referring to FIGS. 3 to 5 together with FIG. 1, the valve member 72 made of a relatively soft synthetic resin such as polyethylene, rubber, elastomer, silicon, etc. has a substantially disk shape and It has a valve portion 76 located there, a base portion 78 having an annular shape and located above, and a connecting portion 80 connecting the valve portion 76 and the base portion 78. The upper surface of the valve portion 76 is an arc-shaped surface which is inclined downward toward the outside in the radial direction as a whole, and a bulging portion 82 bulging upward is formed at the center of the upper surface. At the lower end of the outer peripheral surface of the valve portion 76, an inverted truncated cone-shaped seal portion 84 that is inclined downward inward in the radial direction is formed. As can be understood by referring to FIG. 1, a space portion 85 is formed on the lower surface of the valve portion 76. The space portion 85 is composed of a main portion 85a having a substantially semi-elliptical cross section, and a convex portion 85b projecting upward at the center in the major diameter direction of the main portion 85a. Three connecting portions 80 are provided at equal angular intervals in the circumferential direction. Each connecting portion 80 has a connecting base 80a and a connecting piece 80b. As can be understood by referring to FIGS. 3 to 5, the connection base 80 a is an arc-shaped member that hangs downward from the base 78. The connecting piece 80b extends radially inward from the circumferential center position of the lower end of the inner peripheral surface of the connecting base 80a, and then extends clockwise as viewed from below (that is, in FIG. 5) in a predetermined arc shape. Then, it is a belt-shaped member that extends radially inward again and is connected to the outer peripheral surface of the valve portion 76 above the seal portion 84. Further, as can be clearly understood with reference to FIG. 4, the connecting piece 80b is inclined downward generally radially inward. For this reason, the valve portion 76 can move vertically with respect to the base portion 78. When the valve portion 76 moves upward with respect to the connection base portion 80a, the valve portion 76 has an elastic force of the connection piece 80b. , The downward restoring force is always applied.

  Referring to FIG. 1, a holding member 74 formed of a suitable synthetic resin such as polyethylene or polypropylene has a cylindrical side wall 86 and a substantially circular bottom wall 88 connected to the lower end of the side wall 86. At the upper end of the outer peripheral surface of the side wall 86, an annular held ridge 90 projecting outward in the radial direction is formed. The bottom wall 88 is inclined slightly downward toward the inside in the radial direction, and a circular communication opening 92 is defined in a central region of the bottom wall 88. Further, a cylindrical introduction wall 94 is formed on the bottom wall 88 at the outer peripheral edge of the communication opening 92 so as to surround the communication opening 92 and extend slightly downward in a radially inward direction.

  The above-described check valve 70 is mounted on the closing wall 22 in a state where the outer lid 52 is in the open position with respect to the lid main body 20. In this case, the check valve 70 is positioned below the central region 22a of the closing wall 22 with the valve member 72 disposed inside the holding member 74 and the valve member 72 held by the holding member 74. And is forced upward against the closing wall 22. When the check valve 70 is forced upward with respect to the closing wall 22, the retained ridge 90 elastically passes over the retaining ridge 38 and is locked thereto. When the check valve 70 is mounted on the closing wall 22, the valve member 72 is configured such that the upper surface of the base 78 is in close contact with the lower surface of the closing wall 22 and the lower surface of the connection base 80 a is the bottom wall 88 of the holding member 74. The movement in the vertical direction is regulated in close contact with the upper surface of the base member 78, and the movement in the radial direction is regulated by the outer peripheral surface of the base 78 and the outer peripheral surface of the connection base 80a facing the inner peripheral surface of the side wall 86. At this time, the seal portion 84 further comes into contact with the upper surface of the inner peripheral edge of the bottom wall 88 or the inner peripheral surface of the base end of the introduction wall 94, and the valve portion 76 is moved somewhat upward with respect to the connection base 80a. Then, since the connecting portion 80 has the elastic force as described above, a downward restoring force acts on the valve portion 76, and the seal portion 84 is formed on the upper surface of the inner peripheral edge of the bottom wall 88 to the inner peripheral portion of the proximal end of the introduction wall 94. The check valve 70 is closed. After the check valve 70 is mounted on the closing wall 22, the outer lid 52 is moved to the closed position with respect to the lid main body 20.

  When mounting the container lid 18 on the container 2 filled with the liquid content such as soy sauce in the inner container layer 6, the mounting wall 24 of the container lid 18 is fitted to the mouth and neck 8 of the container 2 (this At this time, the outer peripheral surface of the distal end portion of the seal ring 34 is located radially inward from the upper end portion of the inner peripheral surface of the inner container layer 6), and the container cover 18 is forced downward with respect to the container 2. When the container lid 18 is forced downward with respect to the container 2, the sealing piece 42, the ridge 46, and the locked ridge 40 formed on the mounting wall 24 are sequentially locked on the mouth and neck 8. The protruding ridge 12 is elastically moved over, the lower surface of the tip end of the seal piece 42 is brought into close contact with the upper surface of the annular protrusion 14, and the locked ridge 40 is locked to the locking ridge 12. When the seal piece 42 elastically passes over the ridge 12, the axial separation dimension D between the base end of the seal piece 42 and the base end of the ridge 46 must be smaller than the radial protrusion dimension L2 of the seal piece 42. As a result, the upper surface of the seal piece 42 abuts on the lower surface of the ridge 46, thereby preventing the seal piece 42 from being excessively bent and preventing the seal piece 42 from being inverted. At this time, the seal ring 34 formed on the closing wall 22 further enters the inside of the container 2, more specifically, the inside of the inner container layer 6, and elastically presses this outward in the radial direction. As a result, the outer peripheral surface of the seal ring 34 is in close contact with the inner peripheral surface of the upper end portion of the inner container layer 6, and the content flows out of the seal ring 34 and flows out of the inner container layer 6 (that is, the container 2). Is blocked. Thus, the container lid 18 is attached to the mouth and neck 8 of the container 2.

  When consuming the contents of the container, first, a finger is put on the flange 68 of the outer lid 52 to force the outer lid 52 upward, and the locked ridge 66 of the outer lid 52 is When the outer lid 52 is elastically disengaged from the locking ridge 32, the outer lid 52 is pivoted toward the open position shown by the two-dot chain line in FIG. 1, and thus the closing wall 22 is exposed. Then, the side surface of the container 2 is gripped and appropriately inclined, and the container 2 is squeezed. By squeezing the container 2, the inner container layer 6 is squeezed together with the outer container layer 4, and the pressure inside the inner container layer 6 becomes larger than the pressure outside the container 2. When the pressure inside the inner container layer 6 becomes larger than the pressure outside the container 2 (that is, the pressure inside the closed wall 22 is the outside pressure) by a predetermined value or more, the valve portion 76 of the check valve 70 connects as described above. The seal portion 84 is moved upward against the elastic force of the portion 80, the seal portion 84 is separated from the upper surface of the inner peripheral edge of the bottom wall 88 or the inner peripheral surface of the base end of the introduction wall 94, and the check valve 70 is opened. At this time, the pressure in the inner container layer 6 causes the valve portion 76 to move upward due to the formation of the space portion 85 including the main portion 85a and the convex portion 85b on the lower surface of the valve portion 76. Is applied to the lower surface of the valve portion 76 efficiently, and the valve portion 76 is smoothly moved upward. When the check valve 70 is opened, the contents filled in the inner container layer 6 are passed through the communication opening 92, the check valve 70 (more specifically, between the valve member 72 and the holding member 74), and the discharge opening 26. Are sequentially discharged from the guide wall 28.

  When stopping the discharge of the contents, the pressing of the side surface of the container 2 is released. When the squeezing of the side surface of the container 2 is released, the pressure in the inner container layer 6 becomes equal to the pressure outside the container 2, so that the valve portion 76 of the check valve 70 is moved downward by the above-described restoring force of the connection portion 80. The seal portion 84 is moved in close contact with the upper surface of the inner peripheral edge of the bottom wall 88 or the inner peripheral surface of the base end of the introduction wall 94, and the check valve 70 is sealed. Thereby, the discharge of the contents is stopped, and the inner container layer 6 is sealed. At this time, since the upper surface of the valve portion 76 is an arc-shaped surface that is inclined downward toward the outside in the radial direction as a whole, the contents remaining on the upper surface of the valve portion 76 are radially outward. You will be guided towards. When the discharge of the contents is stopped and the inner container layer 6 is closed, the outer container layer 4 is further restored by its own elastic force, that is, expands from the compressed state to the original bottomed cylindrical wall shape. Thus, a negative pressure is applied between the outer container layer 4 and the inner container layer 6. When the pressure between the outer container layer 4 and the inner container layer 6 becomes smaller than the pressure of the outside air by a predetermined value or more, as shown by a two-dot chain line in FIG. The distal end is separated from the upper surface of the annular projecting portion 14 formed on the outer peripheral surface of the mouth-neck portion 8 of the outer container layer 4 to form a gap, through which the outside air is introduced from the introduction means 10 to the outer container layer 4 and the inner side. It is introduced between the container layer 6. When the pressure between the outer container layer 4 and the inner container layer 6 becomes equal to the pressure of the outside air, as shown by the solid line in FIG. Is again in close contact with the upper surface of the annular projection 14. Thereafter, the outer lid 52 is pivoted from the open position to the closed position shown by the two-dot chain line in FIG. 1 so that the locked ridge 66 of the outer lid 52 is elastically attached to the locking ridge 32 of the lid body 20. It locks. Thus, the outer lid 52 is moved to the closed position. When the outer lid 52 is located at the closed position, the tip of the closing plug 58 of the outer lid 52 passes through the discharge opening 26 of the closing wall 22 and abuts on the bulging portion 82 of the check valve 70 to press it downward. . Thereby, the close contact between the seal portion 84 of the valve member 72 and the upper surface of the inner peripheral edge of the bottom wall 88 of the holding member 74 or the inner peripheral surface of the base end of the introduction wall 94 becomes stronger, and the check valve 70 (more specifically, Leakage of the contents from between the valve member 72 and the holding member 74) is more reliably prevented. Further, the inner seal piece 62 of the outer lid 52 enters the guide wall 28 of the lid body 20, the lower end of the outer peripheral surface of the inner seal piece 62 is in close contact with the inner peripheral surface of the base end of the guide wall 28, and The lower end of the inner peripheral surface of the piece 60 is in close contact with the outer peripheral surface of the leading end of the lip portion of the guide wall 28, and the contents remaining between the check valve 70 and the discharge opening 26 pass through the discharge opening 26 and the lid body. Leakage to the outside of the housing 20 is also prevented.

  Next, a process of taking out the container lid from a part of the mold for forming the lid main body when the container lid configured as described above is formed by injection molding will be described with reference to FIG. The outer peripheral surface of the substantially cylindrical molding die member generally designated by reference numeral 96 is the inner peripheral surface of the mounting wall 24 including the locked ridge 40, the sealing piece 42, and the ridge 46 in the lid body 20 of the container lid 18. The surface is defined, and has an annular convex portion 98 corresponding to the discarded undercut 44 and an annular convex portion 100 corresponding to the undercut 48.

  FIG. 7A shows a state after the container lid 18 is formed by injection molding and before the lid main body 20 is removed from the mold 96. In the state shown in FIG. 7A, in order to take out the lid main body 20 from the molding die 96, the molding die 96 is lowered with respect to the lid main body 20. When the mold 96 is lowered with respect to the lid body 20, the convex portion 100 gets over the seal piece 42 and the convex portion 98 gets over the ridge 46. At this time, as shown in FIG. 7 (b), the ridge 46 is forced radially outward by the convex portion 98, and the lower portion of the mounting wall 24 is temporarily expanded. As a result, when the convex portion 100 gets over the seal piece 42, the convex portion 100 can easily pass through after the tip portion contacts the extended end portion of the seal piece 42 and is slightly bent. It becomes possible. That is, when the container lid 18 (the lid main body 20) is taken out from the molding die 96, the portion where the seal piece 42 is present on the mounting wall 24 of the lid main body 20 due to the presence of the discarded undercut 44 is radially outward. Forcibly, the so-called forced removal of the sealing piece 42 is reduced, and damage to the sealing piece 42 is avoided as much as possible. In the illustrated embodiment, since the radial protrusion dimension L1 of the protrusion 46 is the same as or slightly larger than the radial extension L2 of the seal piece 42, when the protrusion 100 passes through the seal piece 42, The mounting wall 24 at the portion where the seal piece 42 is formed is radially outwardly enlarged by an amount substantially equal to the radial protrusion dimension L1 of the ridge 46, that is, the radial extension L2 of the seal piece 42. The forcible removal of the seal piece 42 is reliably alleviated, and damage to the seal piece 42 is avoided as much as possible. After the protrusion 98 has passed over the seal piece 42, the container lid 2 is removed from the mold 96 by lowering the mold 96 as shown in FIG. 7C.

2: container 4: outer container layer 6: inner container layer 8: mouth and neck 10: hole (introduction means)
18: Container lid 20: Lid body 22: Closure wall 24: Mounting wall 26: Discharge opening 42: Seal piece 44: Discarded undercut 52: Outer lid 70: Check valve 96: Mold 98: Convex part 100: Convex part

Claims (8)

And a closing wall and the closing wall cylindrical shaped mounting wall depending from the outer peripheral edge of the said closing wall with the discharge opening is formed, a check valve for closing the said discharge opening is disposed and which, check valve in the container closure comprising a plastic lid body to be opened when the pressure of the inside of the closing wall is larger than a predetermined value than the pressure outside,
The inner peripheral surface of said mounting wall, with the sealing piece of annular flexible extending radially inwardly is formed integrally with undercut discarded located above the seal strip is formed A container lid characterized by the above-mentioned. 該捨Te undercut by a plurality of arcuate ridges extending circumferentially spaced ridges or circumferential direction of the annular integrally formed on the lower inner peripheral surface of said mounting wall above the said sealing piece 2. The container lid according to claim 1, which is defined.   3. The container lid according to claim 2, wherein a radially extending dimension of the ridge is equal to or larger than a radially extending dimension of the sealing piece.   4. The container lid according to claim 2, wherein an axial distance between the proximal end of the seal piece and the proximal end of the protrusion is smaller than a radially extending dimension of the seal piece.   The container lid according to any one of claims 1 to 4, wherein the sealing piece extends obliquely downward toward the inside in the radial direction.   A top wall and a skirt wall hanging down from an outer peripheral edge of the top wall; a lower end of the skirt wall is connected to an upper end of the mounting wall of the lid body via hinge means; The lid according to any one of claims 1 to 5, further comprising an outer lid integrally formed with the lid main body, the outer lid being rotatable between a closed position covering the closing wall and an open position exposing the closing wall. Container lid as described. In combination with the container and the container lid according to any one of claims 1 to 6,
The container has a laminated structure of a squeezable outer container layer and a squeezable inner container layer, and a mouth and neck portion of the container for introducing outside air between the outer container layer and the inner container layer. An introduction means is formed,
When the container lid is attached to the mouth and neck by fitting the attachment wall of the lid body to the mouth and neck of the container, the sealing piece of the lid body is attached to the outer container layer of the container. Close to a portion of the outer peripheral surface of the mouth and neck portion below the introduction means,
The check valve is opened when the pressure in the inner container layer becomes larger than the pressure outside the container by a predetermined value or more,
Only when the pressure between the outer container layer and the inner container layer becomes smaller than the pressure of the outside air by a predetermined value or more, the sealing piece of the lid main body is removed from the outer peripheral surface of the mouth and neck portion of the outer container layer. Separated,
A combination characterized by the following.   On the outer peripheral surface of the mouth and neck portion of the outer container layer of the container, an annular protrusion located below the introduction means is formed, and the tip of the sealing piece of the lid main body is the annular member. 8. The combination of claim 7, wherein the combination is in close contact with an upper surface of the protrusion.