JP4369711B2 - Synthetic resin cap with a straw slot - Google Patents

Description

  The present invention relates to a synthetic resin cap capable of drinking a beverage in a container through a straw without removing the cap from the container mouth, and more particularly, a composition capable of easily and reliably inserting a straw. It relates to a resin cap.

2. Description of the Related Art Conventionally, a cap that allows a beverage in a container to be drinked without piercing the top plate of the cap with a straw and removing the cap from the container mouth is known.
For example, in Patent Document 1 below, a circular main portion and a strip-shaped additional portion are formed by a breakable thin line having an arc-shaped main portion and a pair of additional portions extending from both ends of the arc-shaped main portion on the upper surface of the top plate portion of the cap. A cap having an open area composed of
Patent Document 2 below describes a synthetic resin cap in which an annular thin portion is provided in a top plate portion, and a radial thin portion is formed in a portion partitioned by the annular thin portion. Such a synthetic resin cap is used by perforating a portion defined by the annular thin portion with a nozzle having an inclined tip.

JP 2002-205753 A JP 2002-225900 A

In general, in a cap having a straw insertion port on the top plate of the cap, it is easy to form an opening with a straw (openability with a straw), and a part of the top plate opened by the straw falls into the container. It is necessary to satisfy the following three requirements: that there is no occurrence (prevention of falling off of the opening region) and that air holes are formed simultaneously with the opening formation by the straw (formability of air holes). The described cap satisfies the above three requirements in a well-balanced manner, but since a synthetic resin cap is required to have a certain mechanical strength, a rigid cap is used, It is desired that the opening by a straw is easier and more reliable, and that the opening region is prevented from falling off.

  In addition, since the cap described in Patent Document 2 is intended for nozzles that are harder and larger in diameter than the straw, it is possible to easily perforate the portion defined by the annular thin portion. In order to perforate a cap having such a structure with a straw, there is a possibility that the tip of the straw is caught in the radial thin portion of the portion defined by the annular thin portion, and the straw tip cannot be easily positioned at the center of the annular thin portion. In order to solve such a problem, it is conceivable to process the thin portion from the cap inner surface side, but when the thick convex portion formed on the cap inner surface side enters the straw into the container, There is also a possibility that the entrance of the straw does not proceed smoothly.

  Accordingly, an object of the present invention is to provide a cap having a straw insertion port that can satisfy the above-mentioned three requirements, particularly the opening by a straw and the formation of air holes at a high level.

According to the present invention, there is provided a synthetic resin cap comprising a top plate portion and a skirt portion depending from the periphery of the top plate portion, the top plate portion being located at a central portion where a recess is formed and outside the central portion. A convex portion projecting downward is formed on the inner surface side of the cap corresponding to the concave portion, and the radial thin wall portion processed from the inner surface side of the cap and the radial thin wall portion are formed on the convex portion. There is provided a synthetic resin cap characterized in that a circular thin-walled portion is formed at the center of the portion, and a boundary portion between the convex portion and the outer peripheral portion of the top plate portion is thin-walled.

According to the synthetic resin cap of the present invention, and Okiiko it is preferable than the thickness of the wall thickness radially thin portion and the circular thin portion at the boundary portion between the convex portion and the top panel outer circumference.

  According to the synthetic resin cap of the present invention, when the straw is inserted, the recess is bent so that the center of the recess protrudes inward of the cap, and there is no unevenness in the recess. It is possible to easily and reliably break the radial thin portion. In addition, a convex portion is formed on the inner surface side of the cap corresponding to the concave portion, and a radial thin portion is formed on the convex portion, so that it is sufficient when the convex portion defined by the adjacent radial thin portions is pushed into the cap. Since there is a space, it does not interfere with the movement by contacting the inner surface of the outer periphery of the top plate, and can be easily pushed into the cap with a straw. Thus, the synthetic resin cap of the present invention is easy to form an opening by a straw, that a part of a top plate portion opened by a straw does not fall into the container, and an opening by a straw. The three requirements of forming air holes at the same time were realized at a high level.

In the synthetic resin cap of the present invention, the top plate portion is composed of a central portion in which a concave portion is formed and an outer peripheral portion located outside the central portion, and a convex portion protruding downward on the inner surface side of the cap corresponding to the concave portion. It is an important feature that the radial thin wall portion is formed on the convex portion from the inner surface side of the cap and the boundary portion between the convex portion and the outer peripheral portion of the top plate portion is thin.
That is, in the synthetic resin cap of the present invention, no concaves and convexes are formed in the concave part with which the straw tip abuts, and a radial thin part is formed on the inner surface side of the concave part, and the radial thin part is pressed by the straw. Therefore, the concave portion bends to the container side (convex downward), so that the straw tip naturally moves to the center of the concave portion with the pressing of the straw, and can be positioned at the optimum position for drilling. It becomes possible.

In addition, a convex portion that protrudes downward is formed on the inner surface of the cap corresponding to the concave portion, and a radial thin portion is processed in this portion from the inner surface side of the cap. It can be formed.
Further, since the convex portion protrudes from the inner surface of the top plate portion, when the straw is pushed into the container after the radial thin portion breaks, the convex portion defined by the adjacent radial thin portions is formed between the convex portion and the outer peripheral portion of the top plate portion. A space that can be deformed downward with the boundary portion as an axis is formed, so that the convex portion abuts on the inner surface of the top plate portion and does not hinder the deformation, and the straw can smoothly enter the container, and the air hole The formation can be easily performed.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a plan view of an example of the synthetic resin cap of the present invention, FIG. 2 is a side cross-sectional view taken along the line XX of FIG. 1, and FIG. 3 is a bottom view of the cap of FIG. FIG. 4 is a partially enlarged cross-sectional view for explaining a situation where a straw is inserted into the cap shown in FIGS.
The synthetic resin cap of the present invention, indicated as a whole by 1, is integrally molded through a top plate portion 2, a skirt portion 3 depending from the periphery of the top plate portion 2, a lower end 4 of the skirt portion 3, and a weakened portion 5 that can be broken. It consists of a band 6 for opening.
An inner ring 7 and an outer ring 8 are formed on the inner surface side of the top plate portion 2, and the inner ring 7 and the outer ring 8 are in close contact with a container mouth portion (not shown) to ensure the sealing performance of the cap. ing.

At the lower end of the skirt portion 3, a finger hooking projection 9 for opening the cap after the opening band 6 is removed is formed. In addition, a plurality of engaging projections 10 are formed at predetermined intervals on the lower part of the inner surface of the skirt portion 3 to engage with the engaging portion of the container mouth portion and fix the cap to the container.
The opening band 6 is formed with a gripping part 11 for breaking the weakened part 5. In the vicinity of the gripping part 11, the opening band 6 extends obliquely upward from the lower end 12 of the opening band 6 and continues to the weakened part 5. A weakened portion 13 is formed. Further, a plurality of flap pieces 14 extending upward from the lower end are formed on the opening band 6 so as to be alternately positioned with the engagement protrusions 10 at a predetermined interval at a position where the engagement protrusions 10 do not exist. The front end portion 15 of the flap piece 14 and the engaging surface 16 of the engaging protrusion 10 can be engaged with the same engaging portion of the container mouth portion, thereby having the advantage that the cap height can be lowered. .

In the cap of the embodiment shown in FIGS. 1 to 3 described above, in the present invention, the top plate portion 2 is composed of a central portion 2a in which a concave portion 21 is formed and an outer peripheral portion 2b positioned around the central portion 2a. A convex portion 22 is formed on the inner surface side of the cap corresponding to the concave portion 21. The boundary portion 23 between the convex portion 22 and the outer peripheral portion 2b is formed thin. On the other hand, the convex portion 22 is formed with a circular thin portion 24 and a radial thin portion 25 extending radially from the circular thin portion 24 at the center thereof by processing from the cap inner surface side.
As described above, since the concave portion is formed in the substantially central portion of the top plate portion 2 and the concave portion is an opening region that can be opened by the straw, the straw can be surely installed in the concave portion and is thinned by an external impact or the like. It is effectively prevented that the part is broken unexpectedly.

FIG. 4 illustrates a situation in which the recessed portion of the cap of the present invention shown in FIG. 2 is enlarged and a straw is inserted into this portion.
That is, as shown in FIG. 4 (A), even when the tip 31 of the straw 30 comes into contact with the position deviated from the center of the recess, in the present invention, as shown in FIG. Since the thin-walled portion 24 and the radial thin-walled portion 25 are deformed and the concave portion 21 bends in the cap inner surface side direction (downward), the tip 31 of the straw 30 automatically moves to the center of the concave portion 21. As a result, as shown in FIG. 4C, the tip 31 of the straw 30 is inserted into the circular thin portion 24, and then the radial thin portion 25 is broken from the center toward the outside, so that the straw enters the cap. Along with this, the convex portion 22a defined by the adjacent radial thin portions 25 is pushed into the cap.

In the specific example shown in FIG. 4C, only the right radial thin portion 25 is broken, and the right convex portion 22a is pushed into the cap as the straw 30 enters the container. At this time, since the boundary portion 23 is formed thin, it functions as a hinge for the convex portion 22a (fan-shaped portion 26 shown in FIG. 3) defined by the adjacent radial thin portions 25 to bend inward of the cap. Then, the convex portions 22a and 22a (fan-shaped portion 26 shown in FIG. 3) can be easily pushed into the cap by a straw. Further, it is particularly preferable that the boundary portion 23 is thicker than the circular thin portion 24 and the radial thin portion 25, whereby the convex portions 22a and 22a (fan-shaped portion 26 shown in FIG. 3) are dropped into the container. Can be effectively prevented.
Further, as is clear from FIG. 4C, the convex portion 22a moves downward with the boundary portion 23 as an axis as the straw 30 enters, but in the present invention, until the entrance of the straw into the container is completed. Since the convex portion 22a moved downward does not come into contact with the outer peripheral surface 27 of the outer periphery of the top plate portion, the straw can be smoothly entered.
Moreover, since the radial thin part 25 is formed from the downward side of the convex part 23, ie, the inner surface side of the cap, when the straw is inserted, the adjacent convex parts 22a collide with each other and the insertion of the straw is inhibited. Absent.

  Further, in the specific example shown in FIG. 4, only the radial thin portion 25 on the right side of the concave portion is broken and only the right convex portion 22 a is pushed inward of the cap, but the diameter of the straw and the concave plane when the straw is inserted Of course, the entire radial thin portion 25 may be broken depending on the insertion angle of the straw, and even if the entire radial thin portion 25 is broken, only a part of the convex portion 22a is pushed into the cap. Of course, there is no problem with the ease of inserting a straw or the formation of air holes.

  In the synthetic resin cap of the present invention, it is possible to drink the contents from the straw by inserting the straw into the recess and breaking the circular thin portion and the radial thin portion without removing the cap from the container mouth. Of course, it is also possible to remove the cap from the container and take out the contents directly from the container. In this case, in the cap of the type shown in FIGS. 1 to 3, the weakened portion 5 is first broken by holding the gripping portion 11, the opening band 6 is removed from the cap 1, and then the finger hooking projection 9 is pushed up to form the skirt portion. The cap can be removed from the container mouth by releasing the engagement between the lower engaging protrusion 10 and the container mouth. The cap from which the opening band has been removed can be resealed, and it is clearly shown that the opening band has been opened once the opening band has been removed.

The specific example shown in FIGS. 1 to 3 is a stopper-type synthetic resin cap having a low cap height. Of course, the cap of the present invention is not limited to this type of cap. As long as it has the characteristics, it can be applied to various types of synthetic resin caps.
For example, it may be a cap-type synthetic resin cap with a high cap height that locks the opening band and the skirt at different portions of the container mouth, or a screw-type cap with a tamper-evidence band formed at the bottom. May be.

In the present invention, the diameter of the boundary portion between the convex portion and the outer peripheral portion of the top plate portion differs depending on the size of the cap, the diameter of the straw, and the like, and cannot be defined unconditionally. It is preferable that
The thickness of the convex portion provided at a position corresponding to the concave portion on the inner surface side of the cap is preferably in the range of 0.5 to 2.0 mm, particularly 1.0 to 1.5 mm.
In addition, the thickness of the circular thin portion and the radial thin portion provided on the convex portion varies depending on the size of the cap and the material and shape of the straw used, but is generally in the range of 0.15 to 0.25 mm. preferable.
Further, the thickness of the boundary portion 23 between the convex portion and the top plate portion outer peripheral portion is larger than the thickness of the radial thin portion, and the convex portion 22a defined by the adjacent radial thin portions (the sector portion 26 shown in FIG. 3). It is preferable to prevent falling into the container, and is generally in the range of 0.25 to 0.5 mm, particularly 0.3 to 0.4 mm.

  The synthetic resin cap of the present invention is not limited thereto, but can be integrally formed by a conventionally known method such as injection molding or compression molding of polypropylene or high density polyethylene.

It is a top view of an example of the synthetic resin caps of the present invention. It is a sectional side view in the XX cross section of FIG. It is a bottom view of the cap of FIG. It is a partially expanded sectional view for demonstrating the condition where a straw is inserted in the cap shown to FIG.

Explanation of symbols

1 Cap of plastic, 2 Top plate, 3 Skirt, 4 Bottom of skirt,
5 weakening part, 6 opening tab, 9 finger hooking protrusion, 10 engaging protrusion, 11 gripping part,
14 flap pieces, 21 concave portions, 22 convex portions, 23 boundary portions, 24 circular thin portions,
25 radial thin-walled parts, 30 straws.

Claims (2)

A synthetic resin cap comprising a top plate portion and a skirt portion suspended from the periphery of the top plate portion, the top plate portion comprising a central portion in which a recess is formed and an outer peripheral portion located outside the central portion. A convex portion protruding downward is formed on the inner surface side of the cap corresponding to the concave portion, and the convex portion is formed with a radial thin portion processed from the cap inner surface side and a circular shape at the central portion of the radial thin portion. A synthetic resin cap characterized in that a thin portion is formed and a boundary portion between the convex portion and the outer peripheral portion of the top plate portion is thin. The convex portion and the top panel outer circumference with claim 1 Symbol placement synthetic resin cap of greater thickness in the boundary portion than the thickness of the radially thin portion and a circular thin portion.

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