JP6017112B2 - Combination of synthetic resin container lid and container - Google Patents

Description

The present invention relates to a synthetic resin container lid in which a locking means is provided on the inner peripheral surface of the tamper evidence skirt and a container in which a locking jaw is formed on the outer peripheral surface of the mouth and neck. Regarding the combination.

  As is well known, a combination of a container formed of glass, a synthetic resin or a metal thin plate and a container lid formed of a synthetic resin is widely used for beverages. The container has a cylindrical mouth-and-neck portion, and a male thread and a locking jaw portion positioned below the male thread are formed on the outer peripheral surface of the mouth-and-neck section. On the other hand, the container lid has a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall. A rupture line extending in the circumferential direction is formed on the skirt wall, and the skirt wall is divided into a main part above the break line and a tamper evidence skirt below the break line. A female thread is formed on the inner peripheral surface of the main part of the skirt wall and is screwed into the male thread of the mouth and neck. Locking means are provided on the inner peripheral surface of the skirt wall tamper evidence hem. It is arranged.

  After filling the container with the beverage, the container lid is fitted over the mouth and neck of the container, the container lid is rotated in the closing direction, and the female thread of the container lid is screwed into the male thread of the mouth and neck. Attach a container lid to the neck and seal the mouth and neck. The locking means disposed on the skirt wall tamper-evidence skirt elastically rides over the locking jaw of the mouth and neck and is positioned below the locking jaw. When the mouth and neck are opened and the beverage is consumed, the container lid is rotated in the opening direction. In this way, the container lid is raised with respect to the mouth-and-neck portion according to the release of the screwing between the female screw and the male screw. When the container lid is raised somewhat, the upper surface of the locking means disposed at the skirt wall tamper evidence skirt is locked to the lower surface of the locking jaw of the mouth and neck, thereby The rise of the evidence skirt is prevented. When the container lid continues to rotate in the opening direction, the break line is broken by the stress generated in the break line formed on the skirt wall, and the tamper evidence skirt of the skirt wall is separated from the main part (or When an axial break line is formed at the tamper evidence hem, the tamper evidence hem is developed from an endless annular shape to an end-band by breaking the axial break line, and the tamper evidence skirt is the main part. And continue to be connected to the main part in a part of the circumferential direction without being completely separated). When the container lid continues to rotate in the opening rotation direction, the tamper evidence hem remains, and the container lid (or the entire container lid including the tamper evidence hem) is detached from the mouth neck. Is released.

  Thus, the locking means disposed on the inner peripheral surface of the skirt wall tamper evidence skirt has a plurality of protrusions protruding radially inward at intervals in the circumferential direction, or continuous in the circumferential direction. However, the amount of protrusion of the protrusion or the annular protrusion in the radial direction is excessive due to so-called unreasonable removal when the mold is detached from the mold. In order to avoid this, it is limited to a relatively small value. Therefore, when opening the mouth and neck, the engagement of the locking means with the locking jaw of the mouth and neck becomes insufficient, and the locking means elastically locks the locking jaw without breaking the breaking line. There is a tendency that a so-called slipping out that rises over the target is generated. In order to prevent such slipping-out, in Patent Document 1 below, the inner diameter of the portion above the locking means on the inner peripheral surface of the tamper evidence skirt is defined as the outer diameter of the locking jaw of the mouth and neck. The inner surface of the tamper evidence hem is tightly fitted to the outer surface of the locking jaw above the locking means, thereby elastically deforming or displacing the tamper evidence hem. Is suppressed.

Japanese Utility Model No. 5-13735

  According to the experience of the present inventors, as disclosed in the above-mentioned Patent Document 1, in the state where the container lid is attached to the mouth and neck as required and the mouth and neck are sealed, the tamper evident skirt of the skirt wall If the inner peripheral surface of the part is tightly fitted to the locking jaw part of the mouth / neck part, the initial torque required to rotate the container lid in the opening direction to open the mouth / neck part will be excessive, and it will be opened for children or women. Operation tends to be quite difficult.

  Japanese Patent Application No. 2010-006784 (hereinafter referred to as “prior application”) specification and drawings relating to the applicant's application include the following: A large-diameter upper part having an inner diameter d1 and a fitting lower part d2 having an inner diameter d2 smaller than d1 are disposed above the locking means on the inner peripheral surface of the tamper-evidence hem part, and In the state where the lid is attached as required and the mouth and neck are sealed, the large diameter upper part of the tamper evident hem is located opposite the locking jaw of the mouth and neck and the tamper evidence hem is engaged. When the container lid is slightly rotated in the opening rotation direction and the container lid is raised with respect to the mouth-neck, the tamper-evidence hem is formed. The lower part of the fitting is positioned against the locking jaw and Be made to be brought into interference fit has been proposed in part. According to the proposal of the prior application, in the state where the container lid is attached to the mouth / neck portion of the container as required and the mouth / neck portion is sealed, the loose fitting upper portion of the tamper evidence hem portion is locked to the mouth / neck portion. The tamper-evidence hem is positioned in opposition to the jaw and is in a loosely or loosely fitted state with respect to the locking jaw, thus avoiding an excessive initial torque required for opening. When the container lid is slightly rotated in the opening rotation direction and the container lid is raised with respect to the mouth and neck, the lower fitting portion of the tamper evidence hem is positioned against the locking jaw and the locking jaw Therefore, it is possible to prevent as much as possible slipping out of the latching means that elastically climbs over the latching jaw portion without breaking the breaking line without breaking the breaking line.

  However, the above-mentioned proposal of the prior application is not always satisfactory, and according to the experience of the present inventor, the female thread and the mouth formed on the inner peripheral surface of the main part particularly in the skirt wall of the container lid. If the male thread formed on the outer peripheral surface of the neck is a single thread with a relatively small lead angle and the thickness of the tamper evidence hem of the container lid is relatively small, the fracture to be broken It turns out that the main part of the skirt wall tends to be detached from the mouth and neck part by completely releasing the screwing of the female thread and the male thread without locally breaking part of the line did.

The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that the locking means can be locked without breaking the breaking line without excessively increasing the required initial torque at the time of opening. It is possible to prevent the slipping through the part elastically over the part, and to prevent the slipping out of the part, and the female thread formed on the inner peripheral surface of the main part of the skirt wall of the container lid and the outer peripheral surface of the mouth neck Even if the male thread formed in is a single thread with a relatively small lead angle and the wall thickness of the tamper evidence bottom of the container lid is relatively small, It is to provide a new and improved synthetic resin container lid and container combination that is fully reliably broken.

  As a result of diligent research and experiments, the present inventor has found that in the above proposal of the prior application, the container lid mounted on the mouth and neck is rotated in the opening direction to raise the container lid relative to the mouth and neck, and the tamper. In a state where the lower fitting portion of the evidence hem is engaged with the outer peripheral surface of the locking jaw and the upper surface of the locking means is locked to the lower surface of the locking jaw, the tamper evidence skirt is directed downward. When tilted at a relatively large inclination angle outward in the radial direction, for example, an inclination angle of 8 degrees, the locking means is locked by the locking jaw without locally breaking a part of the breaking line to be broken. I found out that there is a tendency to rise over the road. Based on this knowledge, the container lid attached to the mouth and neck is rotated in the opening direction to raise the container lid with respect to the mouth and neck, and the lower fitting portion of the tamper evidence hem is the locking jaw. By making the inclination angle of the tamper evidence skirt in a state of engaging with the outer peripheral surface of the tamper-evident and the upper surface of the locking means locked to the lower surface of the locking jaw, the main technical problem is achieved. Found that can be achieved. Since the tamper evidence skirt portion is inclined with the break line as a base, the axial distance between the lock upper surface of the lock means on the container lid and the circumferential break line may be increased in order to reduce the tilt angle. .

As a combination of a container that achieves the main technical problem and a synthetic resin container lid, it has a cylindrical mouth and neck, and a male thread on the outer peripheral surface of the mouth and neck and below the male thread A container in which a locking jaw part is formed, and a synthetic resin container lid attached to the mouth-neck part of the container, the circular top wall and a cylindrical skirt wall depending from the periphery of the top wall The skirt wall is formed with a rupture line extending in the circumferential direction, and the skirt wall is partitioned into a main portion above the rupture line and a tamper evidence skirt below the rupture line. A female thread that is threadedly engaged with the male thread of the mouth and neck is formed on the inner peripheral surface of the main portion, and an inner peripheral surface of the tamper evidence hem is formed on the inner peripheral surface of the mouth and neck. In combination with a synthetic resin container lid in which locking means cooperating with the locking jaw is arranged,
The skirt wall of the synthetic resin container lid has a thick upper portion and a thin lower portion, and the break line is provided in the thin lower portion and has a plurality of slits extending in the circumferential direction at intervals in the circumferential direction. It is composed of a plurality of bridge portions left between the slits,
Top engaging jaw portion of the container has an outer peripheral surface and a bottom surface extending horizontally circular cylindrical shape, which extends locking means substantially horizontally radially inward of said plastic container closure Have
Above the locking means on the inner peripheral surface of the tamper evidence skirt of the container lid, a large-diameter upper portion having an inner diameter d1 and a fitting lower portion having an inner diameter d2 are disposed. The inner diameter d2 is smaller than the inner diameter d1 (d2 <d1), and d2 <D with respect to the outer diameter D of the locking jaw portion of the mouth-and-neck portion. The axial distance from the line is 3.0 mm or more,
In a state where the female thread of the synthetic resin container lid is screwed onto the male thread of the mouth and neck and the synthetic resin container lid is attached to the mouth and neck and the mouth and neck are sealed, The upper part of the tamper evidence hem is positioned opposite the locking jaw of the mouth and neck, and the lower fitting portion of the tamper evidence skirt is the locking jaw of the mouth and neck. Located below the part,
When the container lid attached to the mouth / neck portion is rotated in the opening direction to raise the container lid with respect to the mouth / neck portion, the fitting lower portion of the tamper evidence hem portion is engaged with the locking jaw. And the upper surface of the locking means is locked to the lower surface of the locking jaw. Incline at an inclination angle α where 0 ° <α ≦ 6.5 °,
The combination according to claim and this is provided.

Good Mashiku, there are boundary is inverted truncated cone shape gradually reduced inner diameter downward between the large-diameter upper portion and a fitting bottom of the inner peripheral surface of the tamper evident bottom portion .

In the combination of the container lid and the container according to the present invention, the axial distance between the locking upper surface of the locking means in the container lid and the circumferential break line is 3.0 mm or more, and the container is attached to the mouth and neck. When the lid is rotated in the opening direction and the container lid is raised with respect to the mouth and neck, the lower fitting portion of the tamper evidence hem engages with the outer peripheral surface of the locking jaw and the upper surface of the locking means is engaged. Locked to the lower surface of the stop jaw, in this state, the tamper evidence skirt is inclined radially outwardly at an inclination angle α of 0 ° <α ≦ 6.5 ° and is therefore unsealed. In this case, it is possible to sufficiently prevent the slipping-off that the locking means elastically climbs over the locking jaw portion without breaking the breaking initial line without excessively increasing the required initial torque at the time, and the container. The inner circumference of the main part of the skirt wall of the lid A lead angle is relatively small Ichijo threaded the external thread formed on the outer circumferential surface of the Mesunishi Article and neck are formed on the surface, and also the thickness of the tamper evident bottom portion of the container closure Is relatively small, the entire breaking line to be broken is sufficiently reliably broken .

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 front view which shows the state which mounted | wore the mouth neck part of the container with the container lid of FIG. FIG. 3 is an enlarged partial sectional view showing a part of FIG. 2 in an enlarged manner. FIG. 4 is an enlarged partial cross-sectional view similar to FIG. 3 in a state where the container lid is rotated somewhat in the opening rotation direction from the state shown in FIGS.

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

  Referring to FIG. 1, a container lid 2 that can be injection-molded or compression-molded from a suitable synthetic resin such as polyethylene or polypropylene includes a circular top wall 4 and a cylindrical skirt depending from the periphery of the top wall 4. Wall 6. A cylindrical inner seal piece 8 that hangs downward and a cylindrical outer seal piece 10 that also hangs downward are formed on the inner peripheral edge of the top wall 4. Further, a relatively small annular protrusion 9 is formed between the inner seal piece 8 and the outer seal piece 10.

The skirt wall 6 has a relatively thick upper portion 12 and a relatively thin thin portion 14. A rupture line 16 extending in the circumferential direction is formed at the upper end of the thin lower portion 14, and the skirt wall 6 is partitioned into a main portion 18 above the rupture line 16 and a tamper evidence skirt 20 below the rupture line 16. Has been . Sectional line 16 broken is constituted by a plurality of slits (kerf) 22 and a plurality of bridging portions 24 that are allowed to remain between the slits 22 extending in a circumferential direction at intervals in the circumferential direction, tamper The evidence skirt portion 20 is connected to the main portion 18 via a plurality of bridge portions 24.

  On the outer peripheral surface of the main portion 18 of the skirt wall, a non-slip knurl 26 is formed which is formed of uneven shapes alternately present in the circumferential direction. A female thread 28 is formed on the inner peripheral surface of the main portion 18 of the skirt wall 6. A plurality of notches 29 forming a ventilation path are formed in the female thread 28 at intervals in the circumferential direction. Locking means 30 is disposed on the inner peripheral surface of the tamper evidence skirt 20. In the illustrated embodiment, the locking means 30 is formed of five protrusions 32 that are disposed at intervals in the circumferential direction and extend in the circumferential direction. The longitudinal cross-sectional shape of each main portion (portion excluding both ends) of each protrusion 32 is a substantially right triangle shape, and extends substantially inwardly in the radial direction or slightly downwardly inward in the radial direction. It has an upper surface that protrudes.

  1 and FIG. 3, the description will be continued with reference to FIG. 3. On the inner peripheral surface of the tamper evidence skirt 20, a large-diameter upper portion 34 and a fitting lower portion 36 are disposed above the locking means 30. It is important that It is also important that the large diameter upper portion 34 has an inner diameter d1, the fitting lower portion 36 has an inner diameter d2, and the inner diameter d2 is smaller than the inner diameter d1 (d2 <d1). In the illustrated embodiment, a boundary portion 38 having an inverted frustoconical shape whose inner diameter gradually decreases downward exists between the large-diameter upper portion 34 and the fitting lower portion 36. In the container lid 2 of the present invention, the axial distance X between the upper surface of the locking means 30 and the circumferential break line 16 is relatively large, 3.0 mm or more, preferably 3.0 mm ≦ X ≦ 4.0 mm. This is very important.

  FIG. 2 also shows the container neck 40 of the container together with the container lid 2. The mouth and neck portion 40 of the container which can be formed from a suitable synthetic resin such as polyethylene terephthalate, glass or metal thin plate has a cylindrical shape as a whole, and a male thread 42 and a male thread are formed on the outer peripheral surface of the mouth and neck section 40. A locking jaw 44 positioned below 42 is formed. The locking jaw 44 has a frustoconical upper surface 46 whose outer diameter gradually increases downward, a cylindrical outer peripheral surface 48, and a lower surface 50 extending substantially horizontally. Further provided on the outer peripheral surface of the mouth-and-neck portion 40 is a support ring 52 positioned below the locking jaw 44 (the support ring 52 is used for transporting containers as is well known to those skilled in the art). ing.

  When the container lid 2 is attached to the mouth and neck portion 40 after the contents are filled in the container and the mouth and neck portion 40 is sealed, the container lid 2 is fitted on the mouth and neck portion 40 and the container lid 2 is closed. 2, the female screw 28 of the container lid 2 is screwed onto the male screw 42 of the mouth / neck portion 40. When the female thread 28 is screwed onto the male thread 42 until the state shown in FIG. 2, the inner seal piece 8 of the container lid 2 enters the mouth neck 40 and is brought into close contact with the inner peripheral surface of the mouth neck 40. The annular ridge 9 is brought into intimate contact with the top surface of the mouth and neck portion 40, and the outer seal piece 10 is brought into intimate or close proximity to the outer peripheral surface of the mouth and neck portion 40, thus sealing the mouth and neck portion 40. The locking means 30 disposed on the inner peripheral surface of the tamper evidence skirt 20 elastically moves the locking jaw 44 of the mouth and neck 40 (that is, by elastic deformation or displacement of the tamper evidence skirt 20). It gets over and is located below the locking jaw 44.

  3 and FIG. 3, the description will be continued with reference to FIG. 2 and FIG. 3, in the state where the container lid 2 is attached to the mouth and neck portion 40 as required, that is, as shown in FIG. 2 and FIG. It is important that the large-diameter upper portion 34 on the inner peripheral surface of the occupant is located opposite to the outer peripheral surface 48 of the locking jaw portion 44 in the mouth-and-neck portion 40. The inner diameter d1 of the upper part 34 is about −0.1 mm ≦ (d1−D) ≦ 0.4 mm, particularly 0 mm <(d1−D) ≦ 0.3 mm. It is preferable that the fitting is relatively weak. Then, in the state shown in FIGS. 2 and 3, in the state shown in FIG. 2 and FIG. The axial distance L1 between the lower surface 50 of the locking jaw 44 of the neck 40 and the upper edge of the fitting lower portion 36 on the inner peripheral surface of the tamper evidence skirt 20 is 0.1 to 0.4 mm (L1 = 0. 1 to 0.4 mm), and the axial length L2 of the fitting lower portion 36 on the inner peripheral surface of the tamper evidence skirt 20 is 0.3 to 1.1 mm (L2 = 0.3 to 1.1 mm).

  When opening the mouth and neck portion 40 to consume the contents, the container lid 2 is rotated in the opening direction, that is, counterclockwise as viewed from above in FIG. In the initial stage of such rotation, the large initial diameter portion 34 on the inner peripheral surface of the tamper evidence skirt 20 is located opposite to the locking jaw portion 44 of the mouth and neck portion 40, so that the necessary initial torque becomes excessive. There is nothing. When the container lid 2 is slightly rotated in the opening rotation direction and the container lid 2 is raised to the position shown in FIG. 4 with respect to the mouth-and-neck portion 40, the container lid 2 is disposed on the inner peripheral surface of the tamper evidence skirt 20. The upper end surface of the protrusion 32 constituting the locking means 30 is in contact with the lower surface 50 of the locking jaw portion 44 of the mouth-and-neck portion 40, and the fitting lower portion 36 on the inner peripheral surface of the tamper-evident hem portion 20 is the mouth. It is located opposite to the outer peripheral surface 48 of the locking jaw 44 of the neck 40. The inner diameter d2 of the fitting lower portion 36 is d2 <D, preferably 0.2 mm ≦ (D−d2) ≦ 0.5 mm, with respect to the outer diameter D of the locking jaw 44, and the outer periphery of the locking jaw 44 It is desirable that the fitting lower portion 36 is in an interference fit state with respect to the surface 48. In the combination of the container lid 2 and the container of the present invention, the upper end surface of the projection 32 constituting the locking means 30 disposed on the inner peripheral surface of the tamper evidence skirt 20 is the locking of the mouth neck 40. When the fitting lower portion 36 on the inner circumferential surface of the tamper evidence skirt 20 is positioned opposite to the outer circumferential surface 48 of the locking jaw portion 44 of the mouth / neck portion 40 while being in contact with the lower surface 50 of the jaw portion 44, the fitting is performed. Due to the engagement of the lower portion 36 with the locking jaw portion 44 of the mouth-and-neck portion 40, the inner peripheral surface of the tamper-evidence skirt portion 20 is inclined radially outwardly at an inclination angle α. However, it is important that the inclination angle α is sufficiently small to satisfy 0 ° <α ≦ 6.5 °, particularly 0 ° <α ≦ 6.0 °. As will be clearly understood from the examples and comparative examples described later, when the inclination angle α increases, a part of the breaking line 16 to be broken is not locally broken, and the female thread and the male thread. Therefore, the main part of the skirt wall tends to be detached from the mouth and neck.

  When the container lid 2 is further rotated in the opening direction from the state shown in FIG. 4, the locking means 30 of the container lid 2 is locked to the locking jaw portion 44 of the mouth-and-neck portion 40. Ascending of the skirt 20 is prevented, and stress is generated in the breaking line 16, more specifically, in the bridge portion 24, so that the breaking line 16 is broken and the tamper evidence skirt 20 is separated from the main portion 18 of the skirt wall 6. Is done. When the breaking line 16 is broken, the fitting lower portion 36 on the inner circumferential surface of the tamper evidence skirt 20 is tightly fitted to the outer circumferential surface 48 of the locking jaw portion 44 of the mouth / neck portion 40. Therefore, the elastic deformation or displacement of the tamper evidence skirt 20 is suppressed, and it is sufficiently reliably avoided that the locking means 30 rises over the locking jaw 44 without breaking the breaking line 16. Is done. After the break line 16 is broken and the tamper evidence skirt 20 is separated from the main portion 18 of the skirt wall 6, the tamper evidence skirt of the container lid 2 according to the rotation of the container lid 2 in the opening direction. The portion excluding 20 is raised, the tamper evidence skirt 20 is left in the mouth and neck portion 40, the container lid 2 is detached from the mouth and neck portion 40, and the mouth and neck portion 40 is thus opened.

  In the illustrated embodiment, when the mouth and neck portion 40 is opened, the breaking line 16 is broken over the entire circumferential direction, and the tamper evident skirt portion 20 is completely separated from the main portion 18 of the skirt wall 6. However, if desired, an additional break line extending in the axial direction is formed in the tamper evidence skirt 20, and when opening the mouth neck 40, the bridge portion in the break line 16 remains without being locally broken. As a result, the tamper evidence skirt 20 continues to be connected to the main portion 18 of the skirt wall 6, the additional break line of the tamper evidence skirt 20 is broken, and the tamper evidence skirt 20 expands into a banded end shape. Thus, the locking of the locking means 30 with respect to the locking jaw 44 is released, and the entire container lid 2 including the tamper evidence skirt 20 can be detached from the mouth and neck 40.

Example 1 Fifteen container lids as shown in FIG. 1 were molded from polyethylene by injection molding. The nominal diameter of the molded container lid is 28 mm, the lead angle of the female thread is 2.15 degrees, the thickness of the thin lower part of the skirt wall is 0.45 mm, and the inner diameter d1 of the upper part of the large diameter is 27. 80 mm, the inner diameter d2 of the fitting lower part is 27.45 mm, the axial length L2 of the fitting lower part 36 is 0.80 mm, and the distance X between the upper surface of the locking means and the circumferential break line axial direction is 3.00 mm. there were.

A container lid as described above was attached to the mouth and neck as illustrated in FIG. 2 of a container molded from polyethylene terephthalate. The outer diameter D of the locking jaw of the mouth and neck was 27.97 mm. When the container lid is mounted on the mouth / neck portion as shown in FIG. 2, the lower surface of the locking jaw portion of the mouth / neck portion and the upper end edge of the lower fitting portion on the inner peripheral surface of the tamper evidence hem portion The axial distance L1 was 0.15 mm. The container lid attached to the mouth / neck portion is rotated slightly in the opening rotation direction, and the state shown in FIG. 4, that is, the upper end surface of the protrusion constituting the locking means is located on the lower surface of the locking jaw portion of the mouth / neck portion. The inner circumference of the tamper-evident hem when the lower part of the tamper-evidence hem is brought into contact with the outer circumference of the locking jaw part of the mouth-neck part. The inclination angle α of the surface was 6.5 degrees. Whether or not the break line has been ruptured throughout after the container lid continues to rotate in the open rotation direction, leaving the tamper evidence hem and leaving the remainder of the container lid off the mouth and neck Inspected. As a result, in one of the 15 container lids, a part of the break line remained without being broken, but in the remaining 14 pieces, the entire break line was broken.

  Example 2: Fifteen container lids were formed in the same manner as in Example 1 except that the upper surface of the locking means and the circumferential break line axial interval X were 3.40 mm. Then, when the fitting lower part on the inner peripheral surface of the tamper evidence hem is positioned facing the outer peripheral surface of the locking jaw part of the mouth and neck, the inner peripheral surface of the tamper evidence hem part The break line was inspected for breakage in the same manner as in Example 1 except that the inclination angle α was 5.5 degrees. As a result, the entire break line was broken in all 15 container lids.

  Comparative Example: For comparison, 15 container lids similar to those in Example 1 were formed except that the upper surface of the locking means and the circumferential direction fracture line axial interval X were 2.40 mm. Then, when the fitting lower part on the inner peripheral surface of the tamper evidence hem is positioned facing the outer peripheral surface of the locking jaw part of the mouth and neck, the inner peripheral surface of the tamper evidence hem part The break line was inspected for breakage in the same manner as in Example 1 except that the inclination angle α was 8.0 degrees. As a result, in 10 out of 15 container lids, the entire break line was broken, but in all 5 out of 15 container lids, a part of the break line was broken. It remained without being.

2: the lid 4: the top panel wall 6: skirt wall 12: wall thickness of the skirt wall upper 14: thin skirt wall lower 16: broken line 18: the main portion of the skirt wall 20: tamper evident bottom portion 28: internal thread 30: Locking means 34: Upper part of large diameter 36: Lower part of fitting 40: Mouth neck part 44: Locking jaw part

Claims (2)

A container having a cylindrical mouth-and-neck portion, and a male thread and a locking jaw portion located below the male thread on the outer peripheral surface of the mouth-and-neck, and the mouth-and-neck of the container A synthetic resin container lid attached to a portion, comprising a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and a rupture line extending in the circumferential direction is formed on the skirt wall The skirt wall is divided into a main portion above the break line and a tamper evidence skirt below the break line, and the male thread of the mouth and neck portion is formed on the inner peripheral surface of the main portion. Synthetic resin in which a female thread to be screwed with the thread is formed, and locking means for cooperating with the locking jaw portion of the mouth / neck portion is disposed on the inner peripheral surface of the tamper evidence hem portion In combination with a container lid,
The skirt wall of the synthetic resin container lid has a thick upper portion and a thin lower portion, and the break line is provided in the thin lower portion and has a plurality of slits extending in the circumferential direction at intervals in the circumferential direction. It is composed of a plurality of bridge portions left between the slits,
Top engaging jaw portion of the container has an outer peripheral surface and a bottom surface extending horizontally circular cylindrical shape, which extends locking means substantially horizontally radially inward of said plastic container closure Have
Above the locking means on the inner peripheral surface of the tamper evidence skirt of the container lid, a large-diameter upper portion having an inner diameter d1 and a fitting lower portion having an inner diameter d2 are disposed. The inner diameter d2 is smaller than the inner diameter d1 (d2 <d1), and d2 <D with respect to the outer diameter D of the locking jaw portion of the mouth-and-neck portion. The axial distance from the line is 3.0 mm or more,
In a state where the female thread of the synthetic resin container lid is screwed onto the male thread of the mouth and neck and the synthetic resin container lid is attached to the mouth and neck and the mouth and neck are sealed, The upper part of the tamper evidence hem is positioned opposite the locking jaw of the mouth and neck, and the lower fitting portion of the tamper evidence skirt is the locking jaw of the mouth and neck. Located below the part,
When the container lid attached to the mouth / neck portion is rotated in the opening direction to raise the container lid with respect to the mouth / neck portion, the fitting lower portion of the tamper evidence hem portion is engaged with the locking jaw. And the upper surface of the locking means is locked to the lower surface of the locking jaw, and in this state, the inner peripheral surface of the tamper evidence skirt is radially outwardly outward. Incline at an inclination angle α where 0 ° <α ≦ 6.5 °,
Combination which is characterized a call.   2. The boundary portion having an inverted truncated cone shape in which the inner diameter gradually decreases downward between the upper portion of the large diameter and the lower portion of the fitting on the inner peripheral surface of the tamper evidence skirt portion. Combination of the descriptions.

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