JPWO2018163393A1 - Synthetic resin cap and container - Google Patents

Abstract

Provided is a synthetic resin cap and container capable of improving the opening operation property while improving the tamper evidence property. Cap 1 equipped with a skirt wall 3 provided with an internal thread 5 engaged with an external thread M1 formed on the outer periphery of the container opening M and a band 7 connected to the lower part of the skirt wall via an annular weakening portion 6 A plurality of hooks 8 which can be locked from below on the annular projection 9 provided on the outer periphery of the container opening on the inner peripheral side of the band are provided at intervals in the circumferential direction, and the inner periphery of the band On the side, the hook projects inward of the band above the hook, and the amount of projection is a series of projections 10 smaller than the hook. Furthermore, on the inner peripheral side of the band, the inside diameter increases toward the upper side of the projection. A portion 11 is provided, and the inclined portion extends from the upper end toward the upper end of the protrusion so that the inner diameter decreases with a slope θ of 35 to 45 degrees, and the axial length h5 is 0.2 mm It is -0.8 mm.

Description

  The present invention relates to, for example, a synthetic resin cap and a container attached to the mouth of a container for containing contents such as beverages.

  As a cap attached to the mouth of a container for containing contents such as a beverage, those having a structure capable of confirming the presence or absence of opening at a glance are widely used. As such a cap, a cap body having a skirt wall provided with an internal thread screwed to an external thread of a container mouth, and a tamper evidence band connected to the lower portion of the skirt wall via an annular weakening portion It has been known.

  In the conventional cap described above, the hook (locking means) provided on the inner periphery of the tamper evidence band is the outer periphery of the container opening along with the opening operation (first opening operation) from the state of being attached to the container opening. And the bridge (bridge) formed between the perforation-like slits that define the tamper evidence band and the skirt wall is broken, and the cap body And the tamper evidence band are separated from each other (see Patent Document 1). Therefore, whether or not the opening operation has been performed can be easily confirmed by visually recognizing the presence or absence of breakage of the bridge constituting the annular weakening portion.

Patent No. 5554574 gazette

  However, the cap described in Patent Document 1 has an inner diameter smaller than the outer diameter of the annular protrusion above the hook on the inner peripheral surface of the tamper evidence band, and extends 0.3 to 0.7 mm in the vertical direction. Since the lower surface of the cylindrical shape is provided, when the cap attached to the container opening is opened, rattling of the cap main body is prevented, and consequently the cap main body is not broken. It is possible to prevent so-called slippage coming off from the mouth of the container, and the tamper evidence property is improved, but on the other hand, the torque required for opening is increased, which may make opening difficult.

  The present invention has been made with the above matters in mind, and it is an object of the present invention to provide a synthetic resin cap and container capable of improving the opening operability while improving tamper evidence. is there.

  In order to achieve the above object, the synthetic resin cap according to the present invention has a skirt wall provided with an internal thread screwed on an external thread formed on the outer periphery of a container opening, and an annular weakening portion at the lower part of the skirt wall. A cap provided with a tamper evidence band connected via a hook, and a hook that can be locked from below to an annular protrusion provided on the outer periphery of the container opening on the inner peripheral side of the tamper evidence band The tamper evidence band is provided in a plurality, and on the inner peripheral side of the tamper evidence band, the tamper evidence band protrudes above the hook above the hook, and the protrusion amount is smaller than the hook. Further, on the inner peripheral side of the tamper evidence band, a sloped portion whose inner diameter increases toward the upper side is provided above the projecting portion, and the sloped portion is From the upper end toward the upper end of the projecting portion, the inner diameter is reduced with a gradient of 35 to 45 degrees, and the axial length is 0.2 mm to 0.8 mm (claim 1) .

  In the synthetic resin cap, an outer diameter of the annular protrusion is smaller than an inner diameter of a portion above the inclined portion in the tamper evidence band and larger than an inner diameter of the projecting portion, and the container opening portion is In a state in which the synthetic resin cap is sealed, at least a part of the corner portion located from the outer peripheral surface to the lower surface of the annular projection is located at a height position between the upper end and the lower end of the inclined portion. It may be done (claim 2).

  On the other hand, in order to achieve the above object, the container according to the present invention is provided with the synthetic resin cap according to claim 1 or 2 (claim 3).

  In the present invention, it is possible to obtain a synthetic resin cap and a container which can improve the opening operability while making the tamper evidence property favorable.

  That is, in the synthetic resin cap of the invention according to each claim of the present application, the sloped portion having the predetermined slope and the axial length prevents the so-called slippage at the time of opening the plug while preventing the opening torque sharply. An increase can also be prevented.

  In the synthetic resin cap of the invention according to claim 2, since the sloped portion has a predetermined slope and axial length, the corner portion of the annular projection of the container mouth portion corresponds to the sloped portion in the sealed state. It is easy to manufacture so as to be positioned at the following position, and merits such as an increase in allowable manufacturing error can be obtained.

It is an explanatory view showing roughly composition of an important section of a container provided with a synthetic resin cap concerning an embodiment of the invention. It is a longitudinal cross-sectional view which shows the structure of the said synthetic resin cap roughly. It is a longitudinal cross-sectional view which shows roughly the structure of the principal part of the said container.

  Embodiments of the present invention will be described below with reference to the drawings.

  A synthetic resin cap (hereinafter referred to as a cap) 1 shown in FIGS. 1 and 2 is used by being attached to an opening M of a container such as a plastic bottle, for example, and made of polyethylene by compression molding or injection molding. It is integrally molded. In addition, the raw material which forms the cap 1 is not specifically limited, In addition to the polyethylene used by this embodiment, a polypropylene etc. are used suitably. In FIG. 1, the right half of the cap 1 is not shown.

  The cap 1 has a ceiling wall 2 having a substantially circular shape in a plan view, and a skirt wall 3 having a substantially cylindrical shape extending downward from the outer peripheral portion of the ceiling wall 2. Here, the knurled groove 4 is provided on the outer peripheral surface of the skirt wall 3 and the female screw 5 is provided on the inner peripheral surface, and the female screw 5 can be coupled to the male screw M1 formed on the outer periphery of the container opening M See Figure 2).

  Also, the cap 1 is a pilfer-proof cap having a function of proving unopened (unclogging is never done), and in the lower part of the skirt wall 3, an annular weakening extending around the entire circumference of the skirt wall 3 A tamper evidence band (hereinafter simply referred to as "band") 7 is connected via part 6.

  That is, the annular weakening portion 6 divides the skirt wall 3 and the band 7 up and down, and (perforated) slits which extend intermittently in the circumferential direction of the skirt wall 3 and the band 7 and adjacent slits The bridge is broken when it is pulled by a predetermined force.

  Then, on the inner peripheral side of the band 7, a plurality of (for example, five) hooks 8 protruding inward and configured such that the amount of inward protrusion increases toward the upper side are provided at intervals in the circumferential direction. It is Each hook 8 is substantially below an annular protrusion (bead portion) 9 (see FIG. 1) formed on the outer periphery of the container opening M below the male screw M1 in a state where the cap 1 is attached to the container opening. And is locked to the annular projection 9 by an opening operation. That is, the hook 8 is configured to be able to be locked to the annular projection 9 from below.

  Further, as shown in FIG. 3, on the inner peripheral side of the band 7, the protruding portion 10 which protrudes to the inside of the band 7 above the hook 8 and whose protruding amount is smaller than the hook 9 is connected. Above the point 10, there is a series of slopes 11 whose inner diameter increases toward the top.

  Here, the distance (axial distance) h1 from the lower end of the hook 8 to the lower end of the band 7 is 1.6 mm, and the minimum inner diameter d1 of the hook 8 is 26.5 mm. Moreover, the upper surface of the hook 8 is formed in a horizontal surface, and the distance (distance in the axial direction) h2 to the annular weakening portion 6 is 2.3 mm.

  The protruding portion 10 is configured such that the inner peripheral surface is cylindrical, has an inner diameter d3 smaller than the inner diameter d2 of the portion of the band 7 above the protruding portion 10 and the sloped portion 11, The diameter is smaller than d2 and larger than d3. In this example, d2 is 28.10 mm and d3 is 27.50 mm. The thickness t of the portion of the band 7 above the projecting portion 10 and the inclined portion 11 is considered to be, for example, 0.45 to 0.6 mm, and is 0.55 mm in this example.

  Further, in the present embodiment, in a state where the cap 1 is sealed at the container opening M, the distance (axial distance) h3 from the upper end of the protrusion 10 to the annular protrusion 9 is 0.088 mm. The length h4 in the direction is 0.21 mm. That is, the sum of h3 and h4 is 0.298 mm and 0.3 mm or less. If the sum of h3 and h4 is more than 0.3 mm, the distance until the hook 8 engages with the annular projection 9 at the time of opening the plug becomes too long, which increases the possibility of affecting tamper evidence. On the other hand, if h4 is too small, the anti-rattling function at the time of opening by the projection 10 is impaired, and if the sum of h3 and h4 is too small, depending on the shape of the lower surface of the annular projection 9, Since the annular projection 9 contacts the hook 8 in a sealed state and the opening torque increases, h4 is preferably 0.1 mm or more, and the total of h3 and h4 is preferably 0.2 mm or more.

  In the unopened sealed state where the cap 1 having the above configuration is attached to the container opening M, at least a part of the corner 9a located from the outer peripheral surface to the lower surface of the annular projection 9 is from the upper end to the lower end of the inclined portion 11 It is comprised so that it may be located in the height position between (refer FIG. 3). At this time, the corner portion 9 a may or may not be in contact with the inclined portion 11, but it is preferable that the annular protrusion 9 not be in contact with at least a portion other than the inclined portion 11. When such contact occurs, the opening torque is increased.

  Then, when the cap 1 is rotated in the unsealing direction from the state shown in FIG. 3, the cap 1 ascends relative to the container opening M, and eventually the hook 8 is engaged with the annular projection 9 from below. Become. When the cap 1 attached to the container opening M is unsealed by further rotating the cap 1 in the opening direction, the inner peripheral surface of the projecting portion 10 with respect to the outer peripheral surface of the annular projection 9 of the container opening M Since it abuts, this prevents the cap 1 from being lifted up and loose at an angle, and the annular weakened portion 6 breaks almost uniformly without deviation, and the tamper evidence property becomes good.

  In the relation which constitutes cap 1 as mentioned above, slope 11 extends from the upper end toward the upper end of projection 10 so that the inside diameter becomes smaller with a gradient θ of 35 degrees to 45 degrees, and the axial direction Preferably, the length h5 is 0.2 mm to 0.8 mm, preferably 0.2 mm to 0.4 mm. If the inclination θ is out of the above-mentioned angle range or h5 is out of the above-mentioned length range, a suitable position (from the upper end of the inclined portion 11) to touch or not touch the annular projection 9 in a sealed state. There is a disadvantage such as difficulty in positioning at the height position to the lower end).

  More specifically, first, when the slope θ is less than 35 degrees, when the inclined portion 11 does not contact the annular projection 9 in a sealed state, the annular projection 9 projects with almost no contact even after the opening is started. The possibility of reaching the outer surface of the portion 10 is high, and conversely, when the inclined portion 11 is to be reliably brought into contact with the annular projection 9 in a sealed state, the annular projection 9 is a portion above the inclined portion 11 on the inner surface of the band 7 The risk of getting in contact with the On the other hand, when the gradient θ is 45 degrees or more, the opening torque is rapidly increased after the opening operation is started, and the possibility of interfering with the opening operation is increased.

  When the axial length h5 of the inclined portion 11 is less than 0.2 mm, it is difficult to position the annular projection 9 at the height from the upper end to the lower end of the inclined portion 11 in a sealed state. If it exceeds 8 mm, the projection length of the portion projecting inward of the projection 10 on the upper surface of the hook 8 will be short, and the hook 8 will not be properly engaged with the annular projection 9, and so-called tailing may occur at the time of opening. Increase.

  And, in the cap 1 of the present embodiment, since the inclined portion 11 has a predetermined slope and axial length, the corner portion of the annular projection 9 of the container mouth portion M is made to the inclined portion 11 in the sealed state. It is easy to manufacture so as to be positioned at the corresponding position, and merits such as an increase in allowable manufacturing error can be obtained.

  The present invention is not limited to the above embodiment, and it is needless to say that the present invention can be modified in various ways without departing from the scope of the present invention. For example, the following modifications can be mentioned.

  In the above embodiment, as shown in FIG. 2, the protrusion 10 and the inclined portion 11 are provided corresponding to each hook 8 (only at a position corresponding to the upper side of each hook 8), but the present invention is not limited thereto. For example, at least one of the protruding portion 10 and the inclined portion 11 may be provided continuously in one circumferential direction of the band 7.

  Further, in the above embodiment, as shown in FIG. 2, the protruding portion 10 and the inclined portion 11 are continuous in the circumferential direction of the band 7 from the left end to the right end of each hook 8 above the hooks 8. One or both of them may be provided in the circumferential direction of the band 7 between the left end and the right end of the hooks 8 above the hooks 8.

  The slope θ of each inclined portion 11 may be uniform or may have variations. For example, three inclined portions 11 having a gradient θ of 38 degrees, and an inclined portion having a gradient θ of 43 degrees It is also possible to provide two 11's.

  Needless to say, the above-described modifications may be combined as appropriate.

Reference Signs List 1 synthetic resin cap 2 ceiling wall 3 skirt wall 4 knurled groove 5 female screw 6 annular weakening portion 7 tamper evidence band 8 hook 9 annular projection 9a corner portion 10 projecting portion 11 inclined portion d1 minimum inner diameter of hook d2 inner diameter of upper portion of band Inner diameter of projection h1 Distance from lower end of hook to lower end of band h2 Distance from top of hook to annular weakening distance h3 Distance from upper end of projection to annular projection h4 Axial length of projection h5 Axis of inclined part Direction length M Container opening M1 Male thread t Upper thickness of the band θ gradient

  The present invention relates to, for example, a synthetic resin cap and a container attached to the mouth of a container for containing contents such as beverages.

  As a cap attached to the mouth of a container for containing contents such as a beverage, those having a structure capable of confirming the presence or absence of opening at a glance are widely used. As such a cap, a cap body having a skirt wall provided with an internal thread screwed to an external thread of a container mouth, and a tamper evidence band connected to the lower portion of the skirt wall via an annular weakening portion It has been known.

  In the conventional cap described above, the hook (locking means) provided on the inner periphery of the tamper evidence band is the outer periphery of the container opening along with the opening operation (first opening operation) from the state of being attached to the container opening. And the bridge (bridge) formed between the perforation-like slits that define the tamper evidence band and the skirt wall is broken, and the cap body And the tamper evidence band are separated from each other (see Patent Document 1). Therefore, whether or not the opening operation has been performed can be easily confirmed by visually recognizing the presence or absence of breakage of the bridge constituting the annular weakening portion.

Patent No. 5554574 gazette

  However, the cap described in Patent Document 1 has an inner diameter smaller than the outer diameter of the annular protrusion above the hook on the inner peripheral surface of the tamper evidence band, and extends 0.3 to 0.7 mm in the vertical direction. Since the lower surface of the cylindrical shape is provided, when the cap attached to the container opening is opened, rattling of the cap main body is prevented, and consequently the cap main body is not broken. It is possible to prevent so-called slippage coming off from the mouth of the container, and the tamper evidence property is improved, but on the other hand, the torque required for opening is increased, which may make opening difficult.

  The present invention has been made with the above matters in mind, and it is an object of the present invention to provide a synthetic resin cap and container capable of improving the opening operability while improving tamper evidence. is there.

In order to achieve the above object, the synthetic resin cap according to the present invention has a skirt wall provided with an internal thread screwed on an external thread formed on the outer periphery of a container opening, and an annular weakening portion at the lower part of the skirt wall. A cap provided with a tamper evidence band connected via a hook, and a hook that can be locked from below to an annular protrusion provided on the outer periphery of the container opening on the inner peripheral side of the tamper evidence band plural spaced in direction, the inner peripheral side of the tamper evidence band, protrudes inside of the tamper evidence band above the hook, the projecting amount is minor than the hook, an inner circumferential surface is contiguous the protruding portion is cylindrical, and further, the inner peripheral side of the tamper evidence band, an inner diameter as the upper side becomes larger above the protrusion inclined part The inclined portion extends from the upper end toward the upper end of the protrusion so that the inner diameter decreases with a gradient of 35 to 45 degrees, and the axial length is 0.2 mm to 0.. It is 8 mm (claim 1).

  In the synthetic resin cap, an outer diameter of the annular protrusion is smaller than an inner diameter of a portion above the inclined portion in the tamper evidence band and larger than an inner diameter of the projecting portion, and the container opening portion is In a state in which the synthetic resin cap is sealed, at least a part of the corner portion located from the outer peripheral surface to the lower surface of the annular projection is located at a height position between the upper end and the lower end of the inclined portion. It may be done (claim 2).

  On the other hand, in order to achieve the above object, the container according to the present invention is provided with the synthetic resin cap according to claim 1 or 2 (claim 3).

  In the present invention, it is possible to obtain a synthetic resin cap and a container which can improve the opening operability while making the tamper evidence property favorable.

  That is, in the synthetic resin cap of the invention according to each claim of the present application, the sloped portion having the predetermined slope and the axial length prevents the so-called slippage at the time of opening the plug while preventing the opening torque sharply. An increase can also be prevented.

  In the synthetic resin cap of the invention according to claim 2, since the sloped portion has a predetermined slope and axial length, the corner portion of the annular projection of the container mouth portion corresponds to the sloped portion in the sealed state. It is easy to manufacture so as to be positioned at the following position, and merits such as an increase in allowable manufacturing error can be obtained.

It is an explanatory view showing roughly composition of an important section of a container provided with a synthetic resin cap concerning an embodiment of the invention. It is a longitudinal cross-sectional view which shows the structure of the said synthetic resin cap roughly. It is a longitudinal cross-sectional view which shows roughly the structure of the principal part of the said container.

  Embodiments of the present invention will be described below with reference to the drawings.

  A synthetic resin cap (hereinafter referred to as a cap) 1 shown in FIGS. 1 and 2 is used by being attached to an opening M of a container such as a plastic bottle, for example, and made of polyethylene by compression molding or injection molding. It is integrally molded. In addition, the raw material which forms the cap 1 is not specifically limited, In addition to the polyethylene used by this embodiment, a polypropylene etc. are used suitably. In FIG. 1, the right half of the cap 1 is not shown.

  The cap 1 has a ceiling wall 2 having a substantially circular shape in a plan view, and a skirt wall 3 having a substantially cylindrical shape extending downward from the outer peripheral portion of the ceiling wall 2. Here, the knurled groove 4 is provided on the outer peripheral surface of the skirt wall 3 and the female screw 5 is provided on the inner peripheral surface, and the female screw 5 can be coupled to the male screw M1 formed on the outer periphery of the container opening M See Figure 2).

  Also, the cap 1 is a pilfer-proof cap having a function of proving unopened (unclogging is never done), and in the lower part of the skirt wall 3, an annular weakening extending around the entire circumference of the skirt wall 3 A tamper evidence band (hereinafter simply referred to as "band") 7 is connected via part 6.

  That is, the annular weakening portion 6 divides the skirt wall 3 and the band 7 up and down, and (perforated) slits which extend intermittently in the circumferential direction of the skirt wall 3 and the band 7 and adjacent slits The bridge is broken when it is pulled by a predetermined force.

  Then, on the inner peripheral side of the band 7, a plurality of (for example, five) hooks 8 protruding inward and configured such that the amount of inward protrusion increases toward the upper side are provided at intervals in the circumferential direction. It is Each hook 8 is substantially below an annular protrusion (bead portion) 9 (see FIG. 1) formed on the outer periphery of the container opening M below the male screw M1 in a state where the cap 1 is attached to the container opening. And is locked to the annular projection 9 by an opening operation. That is, the hook 8 is configured to be able to be locked to the annular projection 9 from below.

  Further, as shown in FIG. 3, on the inner peripheral side of the band 7, the protruding portion 10 which protrudes to the inside of the band 7 above the hook 8 and whose protruding amount is smaller than the hook 9 is connected. Above the point 10, there is a series of slopes 11 whose inner diameter increases toward the top.

  Here, the distance (axial distance) h1 from the lower end of the hook 8 to the lower end of the band 7 is 1.6 mm, and the minimum inner diameter d1 of the hook 8 is 26.5 mm. Moreover, the upper surface of the hook 8 is formed in a horizontal surface, and the distance (distance in the axial direction) h2 to the annular weakening portion 6 is 2.3 mm.

  The protruding portion 10 is configured such that the inner peripheral surface is cylindrical, has an inner diameter d3 smaller than the inner diameter d2 of the portion of the band 7 above the protruding portion 10 and the sloped portion 11, The diameter is smaller than d2 and larger than d3. In this example, d2 is 28.10 mm and d3 is 27.50 mm. The thickness t of the portion of the band 7 above the projecting portion 10 and the inclined portion 11 is considered to be, for example, 0.45 to 0.6 mm, and is 0.55 mm in this example.

  Further, in the present embodiment, in a state where the cap 1 is sealed at the container opening M, the distance (axial distance) h3 from the upper end of the protrusion 10 to the annular protrusion 9 is 0.088 mm. The length h4 in the direction is 0.21 mm. That is, the sum of h3 and h4 is 0.298 mm and 0.3 mm or less. If the sum of h3 and h4 is more than 0.3 mm, the distance until the hook 8 engages with the annular projection 9 at the time of opening the plug becomes too long, which increases the possibility of affecting tamper evidence. On the other hand, if h4 is too small, the anti-rattling function at the time of opening by the projection 10 is impaired, and if the sum of h3 and h4 is too small, depending on the shape of the lower surface of the annular projection 9, Since the annular projection 9 contacts the hook 8 in a sealed state and the opening torque increases, h4 is preferably 0.1 mm or more, and the total of h3 and h4 is preferably 0.2 mm or more.

  In the unopened sealed state where the cap 1 having the above configuration is attached to the container opening M, at least a part of the corner 9a located from the outer peripheral surface to the lower surface of the annular projection 9 is from the upper end to the lower end of the inclined portion 11 It is comprised so that it may be located in the height position between (refer FIG. 3). At this time, the corner portion 9 a may or may not be in contact with the inclined portion 11, but it is preferable that the annular protrusion 9 not be in contact with at least a portion other than the inclined portion 11. When such contact occurs, the opening torque is increased.

  Then, when the cap 1 is rotated in the unsealing direction from the state shown in FIG. 3, the cap 1 ascends relative to the container opening M, and eventually the hook 8 is engaged with the annular projection 9 from below. Become. When the cap 1 attached to the container opening M is unsealed by further rotating the cap 1 in the opening direction, the inner peripheral surface of the projecting portion 10 with respect to the outer peripheral surface of the annular projection 9 of the container opening M Since it abuts, this prevents the cap 1 from being lifted up and loose at an angle, and the annular weakened portion 6 breaks almost uniformly without deviation, and the tamper evidence property becomes good.

  In the relation which constitutes cap 1 as mentioned above, slope 11 extends from the upper end toward the upper end of projection 10 so that the inside diameter becomes smaller with a gradient θ of 35 degrees to 45 degrees, and the axial direction Preferably, the length h5 is 0.2 mm to 0.8 mm, preferably 0.2 mm to 0.4 mm. If the inclination θ is out of the above-mentioned angle range or h5 is out of the above-mentioned length range, a suitable position (from the upper end of the inclined portion 11) to touch or not touch the annular projection 9 in a sealed state. There is a disadvantage such as difficulty in positioning at the height position to the lower end).

  More specifically, first, when the slope θ is less than 35 degrees, when the inclined portion 11 does not contact the annular projection 9 in a sealed state, the annular projection 9 projects with almost no contact even after the opening is started. The possibility of reaching the outer surface of the portion 10 is high, and conversely, when the inclined portion 11 is to be reliably brought into contact with the annular projection 9 in a sealed state, the annular projection 9 is a portion above the inclined portion 11 on the inner surface of the band 7 The risk of getting in contact with the On the other hand, when the gradient θ is 45 degrees or more, the opening torque is rapidly increased after the opening operation is started, and the possibility of interfering with the opening operation is increased.

  When the axial length h5 of the inclined portion 11 is less than 0.2 mm, it is difficult to position the annular projection 9 at the height from the upper end to the lower end of the inclined portion 11 in a sealed state. If it exceeds 8 mm, the projection length of the portion projecting inward of the projection 10 on the upper surface of the hook 8 will be short, and the hook 8 will not be properly engaged with the annular projection 9, and so-called tailing may occur at the time of opening. Increase.

  And, in the cap 1 of the present embodiment, since the inclined portion 11 has a predetermined slope and axial length, the corner portion of the annular projection 9 of the container mouth portion M is made to the inclined portion 11 in the sealed state. It is easy to manufacture so as to be positioned at the corresponding position, and merits such as an increase in allowable manufacturing error can be obtained.

  The present invention is not limited to the above embodiment, and it is needless to say that the present invention can be modified in various ways without departing from the scope of the present invention. For example, the following modifications can be mentioned.

  In the above embodiment, as shown in FIG. 2, the protrusion 10 and the inclined portion 11 are provided corresponding to each hook 8 (only at a position corresponding to the upper side of each hook 8), but the present invention is not limited thereto. For example, at least one of the protruding portion 10 and the inclined portion 11 may be provided continuously in one circumferential direction of the band 7.

  Further, in the above embodiment, as shown in FIG. 2, the protruding portion 10 and the inclined portion 11 are continuous in the circumferential direction of the band 7 from the left end to the right end of each hook 8 above the hooks 8. One or both of them may be provided in the circumferential direction of the band 7 between the left end and the right end of the hooks 8 above the hooks 8.

  The slope θ of each inclined portion 11 may be uniform or may have variations. For example, three inclined portions 11 having a gradient θ of 38 degrees, and an inclined portion having a gradient θ of 43 degrees It is also possible to provide two 11's.

  Needless to say, the above-described modifications may be combined as appropriate.

Reference Signs List 1 synthetic resin cap 2 ceiling wall 3 skirt wall 4 knurled groove 5 female screw 6 annular weakening portion 7 tamper evidence band 8 hook 9 annular projection 9a corner portion 10 projecting portion 11 inclined portion d1 minimum inner diameter of hook d2 inner diameter of upper portion of band Inner diameter of projection h1 Distance from lower end of hook to lower end of band h2 Distance from top of hook to annular weakening distance h3 Distance from upper end of projection to annular projection h4 Axial length of projection h5 Axis of inclined part Direction length M Container opening M1 Male thread t Upper thickness of the band θ gradient

Claims (3)

A cap comprising: a skirt wall provided with an internal thread to be engaged with an external thread formed on an outer periphery of a container mouth; and a tamper evidence band connected to the lower portion of the skirt wall via an annular weakening portion,
On the inner peripheral side of the tamper evidence band, a plurality of hooks that can be locked from below are provided at intervals in the circumferential direction on the annular protrusion provided on the outer periphery of the container opening,
Further, on the inner peripheral side of the tamper evidence band, the hook protrudes inward of the tamper evidence band above the hook, and a protrusion smaller in diameter than the hook is connected.
Furthermore, on the inner peripheral side of the tamper evidence band, a sloped portion whose inner diameter increases toward the upper side is provided above the protrusion, and the sloped portion is 35 degrees toward the upper end of the protrusion from its upper end A synthetic resin cap characterized in that the inner diameter is reduced with a 45 degree gradient, and the axial length is 0.2 mm to 0.8 mm. The outer diameter of the annular protrusion is smaller than the inner diameter of a portion above the inclined portion in the tamper evidence band, and larger than the inner diameter of the protrusion,
With the synthetic resin cap sealed in the container opening, at least a portion of the corner located from the outer peripheral surface to the lower surface of the annular projection is at a height between the upper end and the lower end of the inclined portion. The synthetic resin cap according to claim 1, which is configured to be positioned. A container provided with the synthetic resin cap according to claim 1 or 2.

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