JP4757513B2 - Tamper-evidence plastic cap with excellent moldability - Google Patents

Description

  The present invention relates to a tamper-evidence plastic cap capable of opening another part while fixing a part of the cap to the container mouth, and more specifically, a tamper excellent in formability that does not require post-processing during molding. It relates to an evidence plastic cap.

  Conventionally, containers with a large diameter applied to foods such as powdered milk have an inner lid that is removed when starting to use the contents, and an outer lid that covers the inner lid from the outside and seals the container after the inner lid is removed. Has been applied. In such a cap, the outer lid is desired to have tamper-evidence due to the characteristics of the contents, and various types of caps have been proposed.

  For example, the following Patent Document 1 is applied to a flanged container having a plurality of folded blades arranged at the lower end of a tamper evidence band connected to a lower end of a skirt portion through a thin portion that can be broken. In this overcap, the overcap cannot be removed from the container without removing the tamper-evidence band from the skirt by the tip of the folded blade abutting the container flange. That's it.

JP 2004-161325 A

  However, if the cap skirt and the tamper evident band are located on the same line in the axial direction, the force applied to the tamper evident band is easily transmitted to the skirt as it is, without breaking the tamper evident band. The cap can be removed from the container mouth. That is, even if it has a folding blade as in Patent Document 1, if the folding blade is pressed against the inner surface side of the skirt by some member and the tamper evidence band is pushed up from below, the thin portion is broken. The cap can be removed from the container mouth without the possibility, and it is difficult to ensure tamper evidence in which such a possibility is completely eliminated.

  In the cap in which the skirt portion and the tamper evidence band are located on the same line in the axial direction, the thin portion formed between the lower end of the skirt portion and the tamper evidence band may be formed by post-processing or Since it is formed simultaneously with the molding of the cap using a complicated split mold, there is a drawback that the moldability of the cap is inferior.

  Furthermore, the cap applied to such a container is divided into a fixed part that fixes the cap to the container mouth and an openable and closable opening and closing part due to the large diameter of the container and the characteristics of the contents. In this case, it is desired that only a part of the container mouth portion can be opened, and that the measuring spoon can be worn by the fixing portion of the cap.

Accordingly, an object of the present invention is to provide a cap that can exhibit a certain tamper evidence in a cap that can open only a part of the container mouth when the contents are used, and that can be used to scrape the measuring spoon at the fixing portion of the cap. Is to provide.
Another object of the present invention is to provide a cap excellent in moldability without the need for post-processing or complicated split molds when the cap is molded.

According to the present invention, there is provided a plastic cap comprising a top plate portion and a skirt portion, and an engagement protrusion for engaging with an engagement protrusion formed on the outer peripheral surface of the container mouth portion on the inner peripheral surface of the lower end of the skirt portion A thin linear portion is formed on the inner surface of the top plate portion, and a ruptureable thin portion extending continuously downward from the thin portion is formed on the skirt portion corresponding to both ends of the linear thin portion. In addition, the linear thin portion and the ruptureable thin portion are divided into an opening portion in which a grip portion is formed on the outer surface of the skirt portion facing the linear thin portion and other fixed portions, By making the protrusion amount of the engagement protrusion corresponding to the opening portion smaller than the protrusion amount of the engagement protrusion corresponding to the fixing portion, the engagement strength of the opening portion with the container mouth portion is increased. The top plate is formed weaker than the strength. An annular rib is formed on the surface, and the annular rib is formed into a thin rib on the side of the opening portion and a thin rib on the side of the fixing portion at a position intersecting the linear thin portion, The thin ribs and the thin ribs on the fixed part side are displaced in the radial direction, and by turning the straight thin part as a hinge, they are fitted to each other, and minute irregularities that can be stopped in the opened state are formed on the inner and outer surfaces In addition , a plastic cap is provided in which a tamper evidence band having an inner diameter equal to or larger than the outer diameter of the lower end of the skirt portion is formed on the lower end of the skirt portion via a weakened portion.

In the plastic cap of the present invention, the top panel inner surface portion of the solid tough, it is suitable linear protrusions and the adjacent linear thin portion is formed.

ADVANTAGE OF THE INVENTION According to this invention, while being able to provide the plastic cap which has reliable tamper evidence property, although it has tamper evidence property, a container mouth part shape can be made into a simple shape.
Moreover, according to the plastic cap of this invention, post-processing and a complicated split mold are not required, but the moldability is remarkably excellent.

  In the plastic cap of the present invention, it is an important feature that the inner diameter of the tamper evident band provided at the lower end of the skirt portion via the weakened portion is larger than the outer diameter of the skirt portion. This makes it impossible to open the cap illegally without breaking the weakened portion. In other words, since the skirt and the tamper evident band are not located on the same line in the axial direction, the force acting on the tamper evident band always acts on the weakened part and is not transmitted to the skirt as it is. When the force acts on the evidence band, the weakened portion is always broken, so that it is possible to develop a certain tamper evidence property. Moreover, there is an advantage that it is not necessary to provide a locking portion at the tamper evident band and the container opening corresponding thereto.

  In addition, when the tamper evident band is not directly involved in the engagement with the container mouth, the cap is held with the tamper evidence band held by pushing up the opening grip formed at the lower end of the skirt. However, in the present invention, a linear thin wall portion is formed on the inner surface of the top plate portion, and the skirt portion corresponding to both ends of the linear thin wall portion has the thin wall portion. The cap top plate part can be bent into two with the straight thin part as a hinge, and is formed in the skirt part by pushing up the opening gripping part. Since the ruptureable thin wall portion is always ruptured and can exhibit tamper evidence, the above-described problem does not occur.

  In addition, since the inner diameter of the tamper evident band is larger than the outer diameter of the skirt, the weakened part connecting the lower end of the skirt and the upper part of the tamper evidence band does not form an undercut. There is no need to form the weakened portion by post-processing or use a complicated split mold, and the moldability is excellent.

The plastic cap of the present invention is divided into two parts: a linear thin part and a breakable thin part. In one of them, the engagement protrusion on the lower end of the skirt part is engaged with the engagement protrusion on the outer peripheral surface of the container mouth part. On the other hand, it is preferable that the engagement protrusion at the lower end of the skirt portion is formed to have a weak engagement strength with the engagement protrusion on the outer peripheral surface of the container mouth portion. ) Can be easily opened / closed (opening part) with the engagement strength fixed to the container mouth, effectively preventing foreign matter from entering during opening / closing operations, especially in containers with large diameters. It becomes possible to do.
In addition, the cap is bent in two with the straight thin part as a hinge in this way, and one side does not leave the container mouth part, so that the measuring spoon can be scraped at the hinge part by the straight thin part in the open state. It becomes possible.

The plastic cap of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a partially enlarged side sectional view of an example of a plastic cap of the present invention applied to a container mouth, FIG. 2 is a plan view of an example of a plastic cap of the present invention, and FIG. FIG. 4 is a view of the cap shown in FIG. 2 as viewed from the XX line direction, the left half is a side sectional view, the right half is a side view, and FIG. 4 is a view of the cap shown in FIG. FIG. 5 is a side sectional view, the right half is a side view, and FIG. 5 is a bottom view of the cap shown in FIG.
In addition, the container to which the cap of the present invention is applied is characterized in that a protrusion for engagement is formed on the outer peripheral surface of the container mouth. In the specific example shown in FIG. 1, the tip of the container mouth 30 is the inner lid. A curled portion 31 that is curled outward is formed together with the front end of the mouth portion 40 to form an engaging protrusion 32 that engages with the cap. The inner lid 40 is like a drop lid, and the skirt portion 41 of the inner lid hangs downward from the curled portion 31, and the upper outer surface of the skirt portion 41 is in close contact with the inner peripheral surface 33 of the container mouth portion 30. is doing. Further, a content takeout opening 43 is formed in the bottom surface 42 formed at the lower end of the skirt portion 41. In the specific example shown in the figure, a peelable seal lid 44 that covers the content takeout opening 43 from above is provided. Is formed.

The cap of the present invention generally indicated by 1 comprises a top plate portion 2 and a skirt portion 3, and a lower end 4 of the skirt portion 3 is connected to a skirt through weakening portions 5 comprising a plurality of bridging portions. A tamper evident band 6 having an inner diameter larger than the outer diameter of the lower end 4 is integrally formed. On the inner surface of the lower end 4 of the skirt portion, an annular engagement protrusion 7 that engages with the curled portion 31 formed in the container mouth portion is formed.
An inner ring 8 is formed on the inner surface of the top plate portion so as to be in close contact with the inner surface of the inner lid skirt portion to ensure the sealing performance, and is linearly extended to the outer peripheral edge of the top plate portion 2 at the position of the diameter of the top plate portion. The thin-walled portion 9 is formed. Further, on the inner surface of the skirt portion 3, there are formed thin portions 10a and 10b which are continuous with both ends of the linear thin portion 9 and extend in the axial direction and can be broken.

The engaging protrusions 7 provided on the inner surface of the lower end 4 of the skirt portion that engages with the engaging protrusions 32 (formed by the curled portion 31 in the specific example shown in the figure) are provided at two locations on the inner surface of the skirt portion 3 described above. Engagement strengths with the engagement protrusions of the container mouth portion are different with the breakable thin portions 10a and 10b formed as boundaries. As apparent from FIG. 2, in the specific example shown in the figure, the engagement protrusion 7 a formed on the skirt portion corresponding to the arc 11 a among the arcs 10 a to 10 b represented on the outer periphery of the skirt portion is inward of the cap. Since the protrusion amount is smaller than the protrusion amount of the engagement protrusion 7b formed on the skirt portion corresponding to the arc 11b of the arcs 10a to 10b into the cap, the engagement protrusion 7a and the container mouth The engagement strength of the portion with the engagement protrusion 32 is formed to be weaker than the engagement strength of the engagement projection 7b, and the portion corresponding to the arc 11a forms the opening portion 12 that can be opened with the linear thin portion 9 as a hinge. On the other hand, a portion having a strong engagement strength with the container mouth portion is a fixing portion 13 fixed to the container mouth portion.
Further, an opening gripping portion 14 is formed at the lower end of the skirt portion at a position facing the linear thin portion 9 of the opening portion 12 so as to protrude outward from the cap for opening.

The tamper evidence band 6 is formed with a notch 15 immediately below the opening gripping portion 14, and a knob 16 for removing the tamper evidence band at the end of the tamper evidence band adjacent to the notch 15. Is formed.
An annular rib 17 is formed on the outer surface of the top plate portion 3, and the annular rib 17 has a narrow width at a position where it intersects the linear thin portion 9, and the thin rib corresponding to the opening portion 12. 17a is located on the outer peripheral side, the thin ribs 17b corresponding to the fixed portion 13 are located on the inner peripheral side, and when the opening portion 12 is pushed upward, the minute convex portions 19a formed on the inner peripheral surface of the thin ribs 17a. And the minute concave portion 19b formed on the outer peripheral surface of the thin rib 17b are engaged, and the opening portion 12 can be locked in the opened state.
Furthermore, the linear protrusion 18 parallel to the linear thin part 9 is formed in the inner surface of the top plate part of the fixing | fixed part 13, The grinding operation of a measuring spoon can be performed efficiently with this linear protrusion 18. FIG.

  The opening operation of the cap shown in FIGS. 1 to 5 will be described. First, the knob 16 formed on the tamper evidence band 6 is pulled to break the bridge portion 5 connecting the skirt portion lower end 4 and the tamper evidence band 6 upper end. Remove the tamper evident band 6 from the cap 1. Next, by pushing up the opening portion 12 of the cap upward with the grasping portion 14 for opening as a clue, the engagement between the engagement protrusion 7a and the container mouth portion is released, but the engagement of the fixing portion 13 is not released. The ruptureable thin portions 10a and 10b formed in the skirt portion 3 are broken, the cap opening portion 12 is opened by turning the straight thin portion 9 as a hinge, and then the minute projections 19a of the thin rib 17a and the thin portion Engagement of the minute recesses 19b of the ribs 17b makes it possible to stop the unsealed portion 12 in the unsealed state, and the contents can be easily taken out.

The cap of the present invention is not limited to the specific examples described above, and various modifications can be made.
For example, in the specific examples shown in FIGS. 1 to 5, the engagement strength between the cap skirt portion and the container mouth portion was adjusted by the amount of protrusion of the engagement protrusion formed on the skirt portion into the cap. By providing engagement protrusions of different numbers or circumferential lengths in the opening part and the fixing part, the engagement amount in the circumferential direction between the engagement protrusion and the container mouth part can be adjusted, or on the inner surface of the top plate part Engagement strength can also be adjusted by increasing the length of the inner ring to be formed only at the fixed portion so that it does not easily come off.

In addition, the weakened portion connecting the lower end of the skirt portion and the tamper evident band was formed by a plurality of bridging portions in the specific examples shown in FIGS. The lower end of the skirt part and the tamper evident band may be connected.
Further, in FIG. 1 to FIG. 5, linear protrusions parallel to the linear thin wall portion are formed on the inner surface of the top plate portion of the fixed portion. It is also possible to perform a scraping operation of the measuring spoon at the hinge portion.
Furthermore, in FIG. 1 to FIG. 5, the thin ribs 17a and 17b are formed with minute irregularities 19a and 19b and engaged with each other to be locked in the opened state, but the minute irregularities 19a and 19b are not formed. The inner peripheral surface of the thin rib 17a and the outer peripheral surface of the thin rib 17b may be brought into close contact and locked in an opened state. Further, depending on the position of the linear thin portion, the end portions of the annular ribs can be brought into close contact with each other without changing the shape of the thin portion, and the opening portion can be stopped in the opened state.

In the cap of the present invention shown in FIGS. 1 to 5, the linear thin wall portion formed on the inner surface of the top plate portion is formed at the position of the diameter of the top plate portion. May be.
Moreover, a notch can also be formed in the lower end of the skirt portion continuously with the thin breakable portion formed in the skirt portion.

  The container to which the cap of the present invention is applied is not limited to the one shown in FIG. 1, and various forms can be adopted as long as an engagement protrusion capable of engaging with the cap is formed on the outer peripheral surface of the container mouth. The material may be either metal or plastic. In the example shown in FIG. 1, a drop lid type inner lid is used. However, a seal lid that is sealed to a flange formed at the container mouth may be used, or depending on the contents. Does not necessarily require an inner lid.

  The plastic cap of the present invention uses a known resin conventionally used for a resin cap, such as polyethylene and polypropylene, without using a complicated split mold or the like by a conventionally known production method such as injection molding or compression molding. It can be molded integrally and there is no need for post-processing.

The partially expanded side sectional view at the time of applying an example of the plastic cap of this invention to a container mouth part. The top view of an example of the plastic cap of this invention. It is the figure seen from the XX line direction of the cap shown in FIG. 2, A left half is a sectional side view, and a right half is a side view. It is the figure seen from the YY line direction of the cap shown in FIG. 2, A left half is a sectional side view, and a right half is a side view. The bottom view of the cap shown in FIG.

Explanation of symbols

1 cap, 2 top plate part, 3 skirt part, 4 lower end of skirt part, 5 weakened part,
6 Tamper-evident band, 7 Engaging protrusion, 8 Inner ring,
9 linear thin part, 10 breakable thin part, 12 opening part, 13 fixing part,
14 gripping part for opening, 17 annular rib, 18 linear protrusion

Claims (2)

A plastic cap comprising a top plate portion and a skirt portion, wherein an engagement protrusion for engaging with an engagement protrusion formed on the outer peripheral surface of the container mouth portion is formed on the inner peripheral surface of the lower end of the skirt portion, and the top plate A straight thin part is formed on the inner surface of the part, and a skirt part corresponding to both ends of the linear thin part is formed with a breakable thin part extending continuously downward from the thin part, and The straight thin-walled portion and the breakable thin-walled portion are partitioned into an opening portion in which a gripping portion is formed on the outer surface of the skirt portion facing the straight thin-walled portion and other fixed portions, and corresponds to the opening portion. By making the projection amount of the engagement projection smaller than the projection amount of the engagement projection corresponding to the fixed portion, the engagement strength of the opening portion with the container mouth portion is weaker than the engagement strength of the fixed portion. Formed on the outer surface of the top plate portion. The annular rib is formed into a thin rib on the opening portion side and a thin rib on the fixing portion side at a position intersecting the linear thin portion, and the thin rib and the fixing portion on the opening portion side. The thin ribs on the side are displaced in the radial direction, and are formed on the inner and outer surfaces with minute irregularities that can be fitted together by turning the linear thin part as a hinge and stop the opened part in the opened state, and the skirt A plastic cap, characterized in that a tamper evidence band having an inner diameter equal to or larger than the outer diameter of the lower end of the skirt portion is formed at the lower end of the portion via a weakened portion. The plastic cap according to claim 1, wherein a linear protrusion adjacent to the linear thin portion is formed on the inner surface of the top plate portion of the fixed portion .

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