JP5552346B2 - Plastic container lid - Google Patents

Description

  The present invention relates to a synthetic resin container lid having tamper-evident characteristics that prevents the entire container lid from being separated from the container even after opening the mouth and neck of the container. A tamper-evident hem connected to the main body through a plurality of breakable bridging parts arranged at intervals, the bridging part is broken and the main body is detached from the mouth and neck of the container The present invention also relates to a synthetic resin container lid of the type in which the main body is continuously connected to the tamper-evidence skirt that is continuously attached to the mouth and neck of the container via the non-breaking connection piece.

  As a synthetic resin container lid with tamper evident characteristics applied to a container in which a male thread and a locking jaw part located below the male thread are formed on the outer peripheral surface of the mouth and neck, In the following Patent Documents 1 and 2, a top surface wall and a cylindrical skirt wall that hangs down from the periphery of the top surface wall are formed, and a female thread that is screwed into a male thread is formed on the inner peripheral surface of the skirt wall. The main body is connected to the skirt wall of the main body through a plurality of breakable bridging portions arranged at intervals in the circumferential direction, and the inner peripheral surface is locked to the locking jaw portion. A cylindrical tamper-evidence skirt portion provided with a stopping means, and a projecting piece projecting downward is disposed on the skirt wall of the main body. Connect the skirt wall to the tamper evidence hem and connect it to the tamper evidence hem Body movement allowed is the unbroken connecting pieces are disposed plastic container closure having a tilting part tilting angle is gradually made to change on a vertical line is disclosed upwards Te.

  When the container lid as described above is attached to the mouth and neck of the container and the mouth and neck are sealed, the container lid is fitted on the mouth and neck and rotated in the closing direction, and the female thread on the container lid is opened. Screw it onto the male thread on the neck. As the screwing progresses, the container lid is lowered with respect to the mouth and neck, and the locking means formed at the skirt of the tamper evidence elastically rides over the locking jaw of the mouth and neck and below it. It can be locked. When opening the mouth and neck, the container lid is rotated in the opening direction to release the threaded engagement between the male thread on the mouth and neck and the female thread on the container lid. The body of the container lid is raised with respect to the mouth and neck when the screwing is released, but the tamper evidence hem is prevented from rising because the locking means is locked to the locking jaw of the mouth and neck. Therefore, stress is generated in the breakable bridge portion and the breakable bridge portion is broken. When the breakable bridging portion is broken and the main body continues to rise, and the main body is separated upward from the tamper evidence skirt, the inclination of the tilting portion of the non-breaking connecting piece is gradually changed accordingly. . Even after the main body is detached from the mouth and neck, the main body is swung around the required part of the non-breaking connecting piece and pivoted to one side from the mouth and neck of the container. The body continues to be attached to the tamper-evidence skirt via the non-breaking connection piece and is therefore not separated from the container. If the consumption of the container is interrupted when it is partially consumed, not the whole, the main body is swung in the opposite direction to the swiveling direction when opening with the required part of the non-breaking connecting piece as the swivel center Attach it to the mouth and neck of the container, then rotate the container lid in the closing direction and re-engage the female thread of the container lid with the male thread of the mouth and neck, thus temporarily sealing the mouth and neck be able to.

JP 2008-56246 A JP 2010-18290 A

  However, according to the experience of the present inventor, especially when it is necessary to set the overall height of the container lid to be relatively low, the distance between the lower end of the protruding piece and the tamper evidence skirt is significantly reduced, or the distance If a certain amount is secured, the axial width of the portion of the tamper evidence hem that faces the projecting piece is remarkably reduced, and due to this fact, (a) mold release that removes the container lid from the mold During operation, the lower end of the protruding piece is pressed against the upper end of the tamper evidence skirt due to the so-called unreasonable force, and a considerable amount of force is applied to the protruding piece, causing buckling of the protruding piece and the tamper evidence. After the main body of the container lid is disengaged from the mouth and neck of the container after being displaced toward the outer peripheral surface or inner peripheral surface of the hem, the protruding piece of the main body is held on the locking jaw of the mouth and neck. (B) Container The tamper-evidence hem, especially the part facing the protruding piece, is excessively deformed and the breakable bridge connecting the skirt wall and the tamper-evidence hem (C) When opening the mouth / neck of the container, the tamper evidence hem, particularly the part facing the protruding piece, is excessively deformed, and the tamper evidence hem locking means and the container It has been found that there is a tendency that the locking of the mouth and neck with the locking jaw is released, and the tamper evidence skirt is also detached from the mouth and neck of the container.

  The present invention has been made in view of the above facts, and the main technical problem thereof is that the overall height of the container lid needs to be set relatively low, and the distance between the lower end of the protruding piece and the tamper evidence hem portion. The present invention is to provide a new and improved synthetic resin container lid in which the occurrence of the problem as described above is avoided or suppressed even when the size of the container is significantly reduced.

  As a result of intensive studies and experiments, the inventor has found that the skirt wall side pedestal piece projecting downward from the skirt wall and the tamper evidence hem portion upward between the projecting piece and the non-breaking connection piece in the circumferential direction. It has been found that the main technical problem can be achieved by forming at least one of the protruding tamper evidence skirt side pedestal piece.

That is, according to the present invention, as a container lid capable of achieving the main technical problem, a male screw thread and a locking jaw portion positioned below the male screw thread are formed on the outer peripheral surface of the mouth neck. A synthetic resin container lid applied to a container that has a top surface wall and a cylindrical skirt wall that hangs down from the peripheral edge of the top surface wall. An inner peripheral surface connected to the skirt wall of the main body through a main body in which a female thread to be screwed is formed and a plurality of breakable bridging portions arranged at intervals in the circumferential direction Includes a cylindrical tamper-evidence hem portion on which locking means to be locked to the locking jaw is disposed, and a projecting piece projecting downward is disposed on the skirt wall of the main body. The skirt wall of the main body and the tamper evidence skirt are provided on both sides of the protruding piece in the circumferential direction. A synthetic resin container lid provided with a non-breaking connecting piece having a tilting portion that is continuously changed and an inclination angle with respect to a vertical line is gradually changed when the main body is moved upward with respect to the tamper evidence skirt. In
Between the projecting piece and each of the non-breaking connecting pieces in the circumferential direction, a skirt wall side pedestal piece projecting downward from the skirt wall and a tamper evidence skirt side projecting upward from the tamper evidence hem part A synthetic resin container lid is provided in which at least one of the base piece is formed.

Between the projecting piece and each of the non-breaking connecting pieces in the circumferential direction, a skirt wall side pedestal piece projecting downward from the skirt wall and a tamper evidence skirt side projecting upward from the tamper evidence hem part It is preferable that both the base piece are formed. Distance between the upper end of the lower end and said tamper evident bottom portion of the projecting piece, the interval between the upper end of the lower end and said tamper evident bottom portion of the skirt wall base strip, of the tamper evident bottom portion side base piece It is preferable that the interval between the upper end and the lower end of the skirt wall or the interval between the lower end of the skirt wall side pedestal piece and the upper end of the tamper evidence skirt side pedestal piece is the same or larger than these intervals .

  In the container lid of the present invention, the skirt wall side pedestal piece or the tamper evidence skirt side pedestal piece is the upper end of the tamper evidence hem, the lower end of the skirt wall or the tamper evidence skirt side pedestal piece or the skirt wall side pedestal piece. This prevents a considerable force from being applied from the upper end of the tamper evidence skirt to the lower end of the protruding piece. In addition, even if the gap between the lower end of the protruding piece and the tamper evidence skirt is made small, it is possible to avoid the occurrence of buckling in the protruding piece. In the hem part of the evidence, the axial width of the part located opposite to the protruding piece can be made relatively large so that the rigidity of the part can be made relatively large, and when the container lid is attached to the mouth and neck of the container In addition, when the mouth and neck of the container is opened, it is avoided that the tamper evidence skirt, particularly the portion facing the protruding piece, is excessively deformed, and thus the occurrence of the problem as described above is avoided or suppressed.

The front view which shows a suitable embodiment of the synthetic resin container lid comprised according to this invention in part in a cross section. The fragmentary sectional view which shows the cross section of the specific area | region of the tamper evident bottom part in the container lid shown in FIG. The front view which shows a part in cross section for demonstrating the effect | action of the base piece in the case of mold release in the container lid shown in FIG. The front view which shows the state which mounted | wore the mouth neck part of the container with the container lid shown in FIG. 1, and sealed the mouth neck part, in part. The front view which shows the state which rotated the container lid somewhat in the opening rotation direction in order to open a mouth neck part from the state shown in FIG. FIG. 6 is a side view showing a state in which the container lid is further rotated in the opening rotation direction from the state shown in FIG. 5 and the main body of the container lid is detached from the mouth-neck portion and held in a required position.

  Hereinafter, a preferred embodiment of a synthetic resin container lid constructed according to the present invention will be described in more detail with reference to the accompanying drawings.

  Referring to FIG. 1, a container lid, generally designated by numeral 2, which can be conveniently integrally molded from a suitable synthetic resin such as polyethylene or polypropylene by injection molding or compression molding, has a main body 4 and a tamper evidence. The skirt 6 is included. The main body 4 has a circular top wall 8 and a cylindrical skirt wall 10 depending from the periphery of the top wall 8. Two sealing ridges, that is, an inner annular ridge 12 and an outer annular ridge 14 are formed on the inner surface of the top wall 8.

  In the illustrated container lid 2, the upper surface of the top wall 8 of the main body 4 and the outer peripheral surface of the skirt wall 10 are connected via an arcuate boundary surface in the cross-sectional view. The outer peripheral surface of the skirt wall 10 is suspended vertically. An annular flange 16 is provided at the lower end of the skirt wall 10 so as to protrude somewhat outward in the radial direction. Above the annular flange 16, the outer peripheral surface of the skirt wall 10 is composed of a ridge portion extending in the axial direction and spaced apart in the circumferential direction, and a non-ridge portion 18 positioned between the ridge portions. Is formed. Formed on the inner peripheral surface of the skirt wall 10 are female threads, more specifically, three female threads 20 arranged at equal intervals and extending over an angle range of 215 degrees. In a specific angle region (that is, a specific angle region located on the opposite side in the diametrical direction with respect to the protruding piece described later) X over an angle range of 20 to 50 degrees, the female thread 20 located on the lower side in the axial direction is notched. (The reason will be described later).

  The description continues with reference to FIG. 1. The tamper evidence skirt 6 has a cylindrical shape as a whole, and the main body 4 passes through a plurality of breakable bridging portions 22 arranged at intervals in the circumferential direction. The skirt wall 10 is connected. The breakable bridge portion 22 may be substantially the same as the breakable bridge portion disclosed in Japanese Patent Application Laid-Open No. 2007-191206, the upper end portion is connected to the lower end portion of the inner peripheral surface of the skirt wall 10, and the lower end portion is a tamper. It is connected to the upper end of the inner peripheral surface of the evidence skirt 6. Locking means 24 is disposed on the inner peripheral surface of the tamper evidence skirt 6. The locking means 24 in the illustrated embodiment has a circumferential direction except for the region indicated by numeral 23 in FIG. 1 (in this region the axial dimension of the tamper evidence skirt 6 is locally reduced). The cross-sectional shape is a substantially right triangle shape. A fitting lower portion 25 and a loose fitting upper portion 27 are disposed in the region above the locking means 24. The inner diameter of the fitting lower portion 25 is somewhat reduced from the inner diameter of the loose fitting upper portion 27 (for details of the engaging means 24, the fitting lower portion 25, and the loose fitting upper portion 27 in the illustrated embodiment, the applicant of the present application). This is described in detail in the specification and drawings of Japanese Patent Application No. 2010-006784 relating to the above application, so refer to such description). If desired, such as a plurality of locking pieces disposed at intervals in the circumferential direction and inclined upward inward in the radial direction from the inner circumferential surface of the tamper evidence skirt 6, The locking means 24 can also be configured from other appropriate types of locking pieces. On the other hand, in the region 23, the locking means 24 is not provided, but as shown in FIG. 2, a reinforcing protrusion 29 protruding inward in the radial direction is formed. The cross-sectional shape of the reinforcing protrusion 29 may be a substantially semicircular shape.

  1, the lower end edge of the skirt wall 10 of the main body 4 is displaced above the lower end edge of the other area, and the upper end edge of the tamper evidence skirt 6 is the other area. The upper edge of the tamper evidence skirt 6 is further displaced further downward in the center of the region 26, and the skirt wall 10 and the tamper evidence skirt are further displaced. 6, an opening 28 having a substantially horizontally long rectangular shape is generated in the front view. A projecting piece 30 projecting downward is formed on the skirt wall 10 at the center in the circumferential direction of the opening 28. The protruding piece 30 in the illustrated embodiment has a substantially rectangular shape as a whole, and both ends of the lower end portion are formed in an arc shape extending inward in the circumferential direction downward. A gap G <b> 1 exists between the lower end edge of the protruding piece 30 and the upper end edge of the tamper evidence skirt 6.

  In the opening 28, non-breaking connecting pieces 32a and 32b located on both sides of the protruding piece 30 are also disposed. In the illustrated embodiment, the non-breaking connection piece 32a includes a first tilting portion 34a extending substantially horizontally from the lower end edge of the skirt wall 10 to one side in the circumferential direction (left side in FIG. 1), and an extension of the first tilting portion 34a. An intermediate portion 36a that extends slightly downward from the end portion, and a second portion that extends substantially horizontally to the other circumferential side (the right side in FIG. 1) following the intermediate portion 36a and is connected to the upper end portion of the tamper evidence skirt 6. It is comprised from the tilting part 38a. The non-breaking connecting piece 32b has a shape symmetrical with the non-breaking connecting piece 32a, and extends from the lower end edge of the skirt wall 10 to the other side in the circumferential direction (right side in FIG. 1) substantially horizontally. An intermediate portion 36b extending slightly downward from the extending end of the tilting portion 34b, and extending substantially horizontally to one side in the circumferential direction (left side in FIG. 1) following the intermediate portion 36b is connected to the upper end of the tamper evidence skirt 6 The second tilting portion 38b is formed. If desired, the first tilting part 34a and the second tilting part 38a in the non-breaking connection piece 32a and the first tilting part 34b and the second tilting part 38b in the non-breaking connection piece 32b are not horizontal but somewhat. It can also be made to extend at an angle.

  In the container lid 2 configured according to the present invention, a pedestal piece is disposed in the opening 28 between the protruding piece 30 and each of the non-breaking connection pieces 32a and 32b in the circumferential direction. This is very important. In the illustrated embodiment, between the protruding piece 30 and the non-breaking connecting piece 32a, a skirt wall side base piece 40a protruding downward from the skirt wall 10 and a tamper shrimp protruding upward from the tamper evidence skirt 6 are provided. A dent hem side pedestal piece 42a is formed. Similarly, between the protruding piece 30 and the non-breaking connecting piece 32b, the skirt wall side pedestal piece 40b protruding downward from the skirt wall 10 and the tamper evidence skirt portion side protruding upward from the tamper evidence skirt portion 6 are provided. A base piece 42b is formed. The skirt wall side pedestal pieces 40a and 40b have a substantially inverted trapezoidal shape, and the tamper evidence skirt side pedestal pieces 42a and 42b have a substantially trapezoidal shape. A gap G2 exists between the lower end edges of the skirt wall side pedestal pieces 40a and 40b and the upper end edges of the tamper evidence skirt side pedestal pieces 42a and 42b. Such a gap G2 is advantageously set to be the same as or slightly smaller than the gap G1 between the lower end edge of the protruding piece 30 and the upper end edge of the tamper evidence skirt 6. In other words, the gap G1 between the lower end edge of the protruding piece 30 and the upper end edge of the tamper evidence skirt 6 is such that the lower end edge of the skirt wall side pedestal pieces 40a and 40b and the tamper evidence skirt side pedestal piece 42a and Conveniently, it is set equal to or slightly larger than the gap G2 between the upper edge of 42b.

  In the illustrated embodiment, the skirt wall side pedestal piece 40a projecting downward from the skirt wall 10 between the protruding piece 30 and the non-breaking connecting piece 32a and between the protruding piece 30 and the non-breaking connecting piece 32b. 40b and tamper evidence skirt side pedestal pieces 42a and 42b projecting upward from the tamper evidence skirt 6 are formed, if desired, between the protruding piece 30 and the non-breaking connection piece 32a and protruding. The skirt wall side pedestal pieces 40a and 40b projecting downward from the skirt wall 10 and the tamper evidence skirt side pedestal projecting upward from the tamper evidence skirt 6 in each of the piece 30 and the non-breaking connection piece 32b. Only one of the pieces 42a and 42b may be disposed. In this case, the gap G2 between the lower end edge of the skirt wall side pedestal pieces 40a and 40b and the upper end edge of the tamper evidence skirt 6 or the upper end edge of the tamper evidence skirt side pedestal pieces 42a and 42b and the skirt wall 10 It is preferable to set the gap G2 between the lower edge and the gap G1 between the lower edge of the projecting piece 30 and the upper edge of the tamper evidence skirt 6 or slightly smaller than the gap G1.

  In the injection molding or compression molding process of the container lid 2 as described above, when the molded container lid 2 is removed from the mold, due to the so-called unreasonable cause caused by the presence of the female thread 20, etc. The body 4 of the container lid 2 is forced downward in FIG. However, in the container lid 2 constructed according to the present invention, as clearly shown in FIG. 3, when the body 4 of the container lid 2 is forced downward in FIGS. 1 and 3, the skirt wall side pedestal piece 40a and The lower end edge of 40b abuts against the upper end edges of the tamper evidence skirt side pedestal pieces 42a and 42b, thereby restricting the downward movement of the main body 4 in FIGS. Therefore, it is avoided or suppressed that the lower end edge of the projecting piece 30 is pressed against the upper end edge of the tamper evidence skirt 6 with a considerably large force and the buckling is generated in the projecting piece 30. Further, due to the presence of the skirt wall side pedestal pieces 40a and 40b and the tamper evidence skirt side side pedestal pieces 42a and 42b, the gap between the lower end edge of the projecting piece 30 and the upper end edge of the tamper evidence skirt part 6 is determined. Since the protruding piece buckling is avoided even if the gap G1 is relatively small, the gap G1 between the lower end edge of the protruding piece 30 and the upper end edge of the tamper evidence skirt 6 is set to a relatively small value. In the tamper evidence skirt 6, the axial edge width of the portion located facing the protruding piece 30 can be made relatively large, and the rigidity of the portion can be made relatively large.

  Continuing the description with reference to FIG. 4, the mouth-and-neck portion 44 of the container which can be formed from an appropriate synthetic resin such as polyethylene terephthalate or glass has a cylindrical shape as a whole, and its upper surface is opened. On the outer peripheral surface of the mouth-and-neck portion 44, there are male threads, more specifically, three male threads 46 extending over an angle range of 154 degrees, and a locking jaw section 48 positioned below the male threads 46. Is formed.

  When the container lid 2 is attached to the mouth / neck portion 44 and the mouth / neck portion 44 is sealed, the container lid 2 is fitted on the mouth / neck portion 44 and closed (clockwise as viewed from above in FIG. 4). The female thread 20 of the container lid 2 is screwed together with the male thread 46 of the mouth-and-neck portion 44 by rotating. As the female thread 20 is engaged with the male thread 46, the container lid 2 gradually descends with respect to the mouth and neck portion 44. When the container lid 2 is lowered with respect to the mouth / neck portion 44 to the state shown in FIG. 4, the inner annular ridge 12 and the outer annular ridge formed on the inner surface of the top wall 8 in the main body 4 of the container lid 2. 14 are respectively brought into close contact with the inner peripheral surface and the outer peripheral surface of the mouth-and-neck portion 44, whereby the mouth-and-neck portion 44 is sealed. The locking means 24 disposed on the inner peripheral surface of the tamper evidence skirt 6 of the container lid 2 elastically climbs over the locking jaw 48 of the mouth-and-neck 44 and is placed on the lower surface of the locking jaw 48. It can be locked.

  When opening the mouth and neck portion 44, the container lid 2 is rotated in the opening direction (counterclockwise as viewed from above in FIG. 4), and the female thread of the container lid 2 with respect to the male thread 46 of the mouth and neck portion 44 is rotated. The 20 screwing is gradually released. When the screwing is gradually released, the main body 4 of the container lid 2 is rotated in the opening direction and raised, but the tamper evidence skirt 6 is locked by the locking jaws 48 of the mouth-and-neck portion 44 by the locking means 24. As a result, the rise is prevented, and due to this, a considerable stress is generated in the breakable bridge portion 22 and the breakable bridge portion 22 is broken. After that, the main body 4 of the container lid 2 rises with the rotation in the opening direction, and is gradually separated upward from the tamper evidence skirt 6. As clearly understood by referring to FIG. 5 in conjunction with FIG. 4, when the body 4 is gradually separated from the tamper evidence skirt 6 upwardly, the first tilting portion 34a of the non-breaking connecting piece 32a and the non-breaking portion The second tilting portion 38b of the connecting piece 32b is pivoted clockwise in FIGS. 4 and 5 around the respective upper and lower ends, that is, tilted in the clockwise direction, while the second tilting portion 38a of the non-breaking connecting piece 32a. The first tilting portion 34b of the non-breaking connecting piece 32b is pivoted counterclockwise in FIGS. 4 and 5 around the lower end and the upper end of the non-breaking connecting piece 32b, that is, tilted counterclockwise. The tilt angles of the first tilt portions 34a and 34b and the second tilt portions 38a and 38b in 32a and 32b with respect to the vertical line are gradually changed. As clearly understood by referring to FIG. 6 together with FIGS. 4 and 5, when the female thread 20 of the container lid 2 is completely disengaged from the male thread 46 of the mouth and neck 44, the container The main body 4 of the lid 2 is detached from the mouth / neck portion 44. However, the main body 4 is separated from the container's mouth and neck 44 because it continues to be connected to the tamper evidence skirt 6 that is still attached to the mouth and neck 44 via the non-breaking connection pieces 32a and 32b. There is nothing.

  After the main body 4 of the container lid 2 is detached from the mouth / neck portion 44, the main body 4 is swung in a direction away from the mouth / neck portion 44 (counterclockwise in FIG. 6) to the state illustrated in FIG. Thus, the outer surface of the lower end portion (tip end portion) of the protruding piece 30 formed on the main body 4 comes into contact with the upper surface of the locking jaw portion 48 of the mouth-and-neck portion 44, whereby the main body 4 is positioned as shown in FIG. Is releasably held. Therefore, the consumer can eat and drink contents such as a soft drink present in the container without being obstructed by the presence of the main body 4.

  When the eating and drinking of the contents is interrupted in the middle, the main body 4 held at the position shown in FIG. 6 is turned clockwise in FIG. Is rotated in the closing direction so that the female thread 20 of the container lid 2 is screwed into the male thread 46 of the mouth-and-neck section 44, and thus the container lid 2 is positioned again in the state shown in FIG. 44 can be temporarily sealed. In the illustrated embodiment, when the main body 4 is pivoted clockwise in FIG. 6 and the main body 4 is fitted again to the mouth-and-neck portion 44, the female formed on the inner peripheral surface of the skirt wall 10 of the container lid 2 in the illustrated embodiment. Since the thread 20 is notched in the specific region X (FIG. 1), the female thread 22 interferes with the male thread 46 of the mouth-and-neck part 44, and the fitting of the main body 4 to the mouth-and-neck part 44 is prevented. Inhibiting is sufficiently avoided.

2: Container lid 4: Main body 6: Tamper evidence hem 8: Top wall 10: Skirt wall 20: Female thread 22: Breakable bridge 24: Locking means 30: Protruding piece 32a: Non-breaking connecting piece 32b : Non-breaking connecting piece 34a: first tilting portion 34b: first tilting portion 38a: second tilting portion 38b: second tilting portion 40a: skirt wall side pedestal piece 40b: skirt wall side pedestal piece 42a: tamper Evident hem side pedestal piece 42b: Tamper evidence pedestal side pedestal piece 44: Container neck and neck 46: Male thread 48: Locking jaw

Claims (3)

A synthetic resin container lid applied to a container in which a male thread and a locking jaw part positioned below the male thread are formed on an outer peripheral surface of the mouth and neck, the top wall and the top wall A cylindrical skirt wall that hangs down from the peripheral edge of the skirt wall, and an inner peripheral surface of the skirt wall is provided with a main body formed with a female thread that is screwed to the male thread, and is spaced apart in the circumferential direction. A cylindrical shape that is connected to the skirt wall of the main body through a plurality of breakable bridging portions, and is provided with a locking means that is locked to the locking jaw on the inner peripheral surface. The skirt wall of the main body is provided with projecting pieces protruding downward, and the skirt wall of the main body and the tamper shrimp are disposed on both sides in the circumferential direction of the projecting piece. Connected to the dent hem and vertically moved when the body is moved upward relative to the tamper evidence hem. In the synthetic resin container closure unbroken connecting pieces are disposed with a tilt portion inclination angle is gradually made to change with respect to,
Between the projecting piece and each of the non-breaking connecting pieces in the circumferential direction, a skirt wall side pedestal piece projecting downward from the skirt wall and a tamper evidence skirt side projecting upward from the tamper evidence hem part A synthetic resin container lid, wherein at least one of the base piece is formed.   Between the projecting piece and each of the non-breaking connecting pieces in the circumferential direction, a skirt wall side pedestal piece projecting downward from the skirt wall and a tamper evidence skirt side projecting upward from the tamper evidence hem part The synthetic resin container lid according to claim 1, wherein both the base piece and the base piece are formed. Distance between the upper end of the lower end and said tamper evident bottom portion of the projecting piece, the interval between the upper end of the lower end and said tamper evident bottom portion of the skirt wall base strip, of the tamper evident bottom portion side base piece 3. The composition according to claim 1, wherein the distance between the upper end and the lower end of the skirt wall or the distance between the lower end of the skirt wall side pedestal piece and the upper end of the tamper evidence skirt side pedestal piece is equal to or greater than the distance. Resin container lid.

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