Container mouth, resin container having container mouth, and preform having container mouth

Abstract

To provide a port structure in which dent more hardly occurs during transportation and others.SOLUTION: In a container port part 10 which is provided at a container body and is sealed because a seal part contacts with an inner periphery surface when a cap that includes the seal part therein is fitted, a circular arc part 14 which is convex toward the inside is formed between a top surface 12 and an inner periphery surface 13 of the container port part 10. A tangential line T at the circular arc part 14 has, as a starting point, a connection point between the circular arc part 14 and the top surface 12 or a cross point A2 between a virtual extension line E1 of the circular arc part 14 and the top surface 12 or a virtual extension line E3 of the top surface 12, and an angle θ between the top surface 12 and the tangential line T is 30° to 60°.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a container mouth that is provided on a container body and is sealed when a cap having a seal portion therein is attached, by the seal portion coming into contact with an inner peripheral surface. [Background technology]

[0002] Examples of the container having the above-mentioned container mouth include a preform and a resin container such as a bottle container manufactured using the preform. When multiple such resin containers are stored in a container or the like and transported, the resin containers may collide with each other, causing dents on the mouths of the resin containers. If a cap is attached to the mouth of a resin container with such scratches, the scratches on the mouth may damage the seal of the cap, and the contents filled in the resin container may leak out from the damaged part of the seal. In light of these circumstances, resin containers have been manufactured and sold in Europe since 2011 in which a chamfer is formed between the top surface and inner peripheral surface of the preform at the container mouth, thereby reducing the occurrence of dents at the mouth of the preform and preventing a decrease in the sealing ability of the container mouth, as shown in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-131666 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional container mouth configuration, dents may occur on the lower part of the chamfered portion, which may result in a decrease in the sealing performance of the container mouth, and there is still room for improvement. Therefore, the object of the present invention is to provide a mouth structure that is less likely to cause dents during transportation, etc., and that can prevent a decrease in the sealing performance of the container mouth. [Means for solving the problem]

[0005] The container mouth of the present invention is characterized in that, in the container mouth, which is provided on the container body and sealed by contacting the inner peripheral surface of the container with a cap having a seal portion therein, a first arc portion that is convex toward the inside is formed between the top surface and the inner peripheral surface of the container mouth, and the first arc portion Virtual extension of The tangent at ,before The imaginary extension line of the first arcuate portion and before The intersection point with the imaginary extension of the top surface contact an angle between the top surface and the tangent line is 30° to 50°; a second arc portion is formed between the first arc portion and the top surface so as to inscribe both of them; and a third arc portion is formed between the first arc portion and the inner peripheral surface so as to inscribe both of them. ,before The imaginary extension line of the first arcuate portion and before The distance from the intersection with the imaginary extension line of the inner circumferential surface to the imaginary extension line of the top surface is 0.3 mm to 1.0 mm.

[0006] A further characteristic feature of the container mouth of the present invention is the above-mentioned First The radius of curvature of the arc portion is 6 mm or less.

[0007] Further characteristic features of the container mouth of the present invention are as follows: ,before Note First Virtual extension line of arc and before The distance from the intersection with the imaginary extension line of the top surface to the imaginary extension line of the inner peripheral surface is 0.3 mm to 3.0 mm. Effect of the Invention

[0010] As in the present invention, an arcuate portion that is convex toward the inside is formed between the top surface and the inner peripheral surface of the container mouth, and a tangent to the arcuate portion starts from a connection point between the arcuate portion and the top surface, or an intersection point between an imaginary extension line of the arcuate portion and the top surface or an imaginary extension line of the top surface, and the angle between the top surface and the tangent is 30° to 5 By setting the angle to 0°, the connection point between the arc portion and the inner peripheral surface can be located further down, and as a result, the occurrence of dents at the connection point between the arc portion and the inner peripheral surface, which affects the sealing performance of the container mouth, can be reduced. In particular, when another arc portion having a smaller radius of curvature than the arc portion is formed between the arc portion and the top surface and between the arc portion and the inner peripheral surface, the connection point between the arc portion and the inner peripheral surface can be located even further down, so that the occurrence of dents at the connection point between the arc portion and the inner peripheral surface can be further reduced and the deterioration of the sealing performance of the container mouth can be prevented. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a side view of the bottle container. [Diagram 2] 1 is a vertical cross-sectional view showing a state in which a cap is attached to a container mouth portion of a bottle container. [Diagram 3] FIG. [Figure 4] FIG. 13 is an enlarged view of a main portion of a container mouth when the radius of curvature of the arc portion is 3.0 mm. [Diagram 5] FIG. 13 is an enlarged view of a main portion of a container mouth when the radius of curvature of the arc portion is 6.0 mm. [Figure 6] FIG. 2 is a side view of the preform. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [Embodiment] Hereinafter, an embodiment of the container mouth of the present invention will be described with reference to the drawings. Here, the container mouth of the present invention will be described as being applied to a resin bottle container as an example.

[0013] As shown in Figures 1 and 2, the bottle container 1 of this embodiment is composed of a cylindrical container body 2 with a bottom and a cylindrical container mouth portion 10 integrally formed at the tip of the container body 2, and the container mouth portion 10 is configured so that a cap 20 can be attached.

[0014] 2 and 3, the cap 20 includes a top plate portion 21, a tubular portion 22 that hangs down from the periphery of the top plate portion 21 and has a screw thread 25 on its inner peripheral surface 13, an outer ring 23 that is formed on the inner surface of the top plate portion 21 and in contact with the outer peripheral surface 17 of the container mouth portion 10, and an inner ring 24 that is formed on the inner surface of the top plate portion 21 and in contact with the inner peripheral surface 13 of the container mouth portion 10. That is, in this embodiment, the inner ring 24 corresponds to the "seal portion" of the present invention.

[0015] The outer ring 23 and the inner ring 24 have a shape that protrudes from the inner surface of the top plate portion 21. The outer ring 23 comes into contact with the outer peripheral surface 17 of the container mouth portion 10, and the inner ring 24, which is longer (vertical distance from the top plate portion 21) than the outer ring 23, comes into contact with the inner peripheral surface 13 of the container mouth portion 10, thereby sealing the inside of the bottle container 1.

[0016] The cap 20 is not particularly limited in terms of material or manufacturing method, but can be manufactured, for example, by using a resin such as polyethylene, polypropylene, or polystyrene and molding the top plate portion 21, the cylindrical portion 22, the outer ring 23, and the inner ring 24 integrally.

[0017] As shown in Figures 1 and 2, a container body 2 having a container mouth 10 includes a shoulder 3 connected to the container mouth 10, a body 4 connected to the shoulder 3, and a bottom 5 connected to the body 4 and located at the lowest part.

[0018] The bottle container 1 is a container made of resin such as polyethylene terephthalate (PET), polyethylene, polypropylene, etc., and the container body 2 and the container mouth 10 can be manufactured integrally by, for example, blow molding a preform having a container mouth 10 formed by injection molding, etc. Such a bottle container 1 can be used for beverages such as water and carbonated drinks, or for food such as sauces, etc.

[0019] As shown in Figures 2 and 3, the container mouth 10 has a top surface 12, an inner surface 13, and an outer surface 17, and is configured so that the cap 20 can be easily attached and detached by screwing it into the threads 25 of the cap 20, and is configured so that the inner surface 13 can come into contact with the inner ring 24 of the cap 20.

[0020] As shown in Fig. 3, an inwardly convex arc portion 14 is formed between the top surface 12 and the inner peripheral surface 13 of the container mouth. Furthermore, a second inwardly convex arc portion 15 is formed between the arc portion 14 and the top surface 12, and a third inwardly convex arc portion 16 is formed between the arc portion 14 and the inner peripheral surface 13. That is, in the container mouth in this embodiment, three arc portions 14 are connected from the top surface 12 to the inner peripheral surface 13. The second arc portion 15 and the third arc portion 16 correspond to the "other arc portion" of the present invention, and the radius of curvature of each of the second arc portion 15 and the third arc portion 16 is smaller than the radius of curvature of the arc portion 14.

[0021] The tangent line T to the arc portion 14 starts from the intersection point A2 between the imaginary extension line E1 of the arc portion 14 and the top surface 12 or the imaginary extension line E3 of the top surface 12, and the angle θ between the top surface 12 and the tangent line T is preferably 30° to 60°, and more preferably 30° to 50°. Note that the tangent line T in this embodiment starts from the intersection point A2 between the imaginary extension line E1 of the arc portion 14 and the imaginary extension line E3 of the top surface 12, and the angle θ is set to 40°.

[0022] The radius of curvature of the arcuate portion 14 is 6 mm or less, preferably 1.0 mm to 6.0 mm, and more preferably 1.0 mm to 4.0 mm. In this embodiment, the radius of curvature of the arcuate portion 14 is set to 3.0 mm.

[0023] It is desirable that the radius of curvature of the second arc portion 15 and the third arc portion 16 be 0.1 mm to 1.0 mm. In this embodiment, the radius of curvature of the second arc portion 15 and the third arc portion 16 are both set to the same value of 0.3 mm.

[0024] The distance D from the intersection A2 of the imaginary extension line E1 of the arc portion 14 and the top surface 12 or the imaginary extension line E3 of the top surface 12 (in this embodiment, the intersection A2 is the intersection of the imaginary extension line E1 of the arc portion 14 and the imaginary extension line E3 of the top surface 12) to the imaginary extension line E2 of the inner peripheral surface 13 is preferably 0.3 mm to 3.0 mm, more preferably 0.3 mm to 1.0 mm, and most preferably 0.3 mm to 0.6 mm. Note that the distance D in this embodiment is 0.33 mm.

[0025] The distance H from the intersection B2 of the imaginary extension line E1 of the arc portion 14 and the inner circumferential surface 13 or the imaginary extension line E2 of the inner circumferential surface 13 (in this embodiment, the intersection B2 of the imaginary extension line E1 of the arc portion 14 and the imaginary extension line E2 of the inner circumferential surface 13) to the imaginary extension line E3 of the top surface 12 is preferably 0.3 mm to 3.0 mm, more preferably 0.3 mm to 1.0 mm, and most preferably 0.3 mm to 0.6 mm. In this embodiment, the distance H is 0.32 mm.

[0026] Other embodiments In the above-mentioned embodiment, the configuration in which the second arc portion 15 and the third arc portion 16 are provided is shown, but the present invention is not limited thereto, and the second arc portion 15 and the third arc portion 16 may not be provided. In this case, the tangent line T of the arc portion 14 starts from the connection point A1 between the arc portion 14 and the top surface 12, and the angle θ between the top surface 12 and the tangent line T is preferably 30° to 60°, and more preferably 30° to 50° (see Figs. 4 and 5). In addition, the distance D from the connection point A1 between the arc portion 14 and the top surface 12 to the imaginary extension line E2 of the inner peripheral surface 13 is preferably 0.3 mm to 3.0 mm, and the distance H from the connection point B1 between the arc portion 14 and the inner peripheral surface 13 to the imaginary extension line E3 of the top surface 12 is preferably 0.3 mm to 3.0 mm (see Figs. 4 and 5).

[0027] In the above-described embodiment, the container mouth portion of the present invention is shown to be applied to a resin bottle container, but this is not limited to this. For example, it may be applied to a cylindrical preform P with a bottom and one side open, as shown in FIG. 6, or it may be applied to a container other than a resin container. EXAMPLES

[0028] A comparison was made of shapes having different radii of curvature of the arcuate portion 14 at the container mouth 10 . In the embodiment shown in FIG. 4, the radius of curvature of the arcuate portion 14 is set to 3.0 mm, and in the embodiment shown in FIG. 5, the radius of curvature of the arcuate portion 14 is set to 6.0 mm.

[0029] In both of the two embodiments shown in Figures 4 and 5, no additional arc portions 15, 16 are provided, the angle between the top surface 12 and the tangent line T is 40° in both cases, and the distance D from the connection point A1 between the arc portion 14 and the top surface 12 to the imaginary extension line E2 of the inner surface 13 is the same length.

[0030] In this case, the distance H1 from the connection point B1 of the arc portion 14 with the inner circumferential surface 13 to the imaginary extension line E3 of the top surface 12 in the embodiment of Fig. 4 was longer than the distance H2 from the connection point B1 of the arc portion 14 with the inner circumferential surface 13 to the imaginary extension line E3 of the top surface 12 in the embodiment of Fig. 5 (H1>H2). In other words, it was found that even if the angle of the tangent line T is the same, when the radius of curvature of the arc portion 14 is reduced, the connection point B1 of the arc portion 14 with the inner circumferential surface 13 is positioned further downward.

[0031] Therefore, ten preforms (constituent material: PET, weight: 27.5 g) having a container mouth portion according to the above-mentioned embodiment, in which the radius of curvature of the arc portion 14 is 3.0 mm, the radius of curvature of each of the second arc portion 15 and the third arc portion 16 is both 0.3 mm, and the angle between the top surface 12 and the tangent line T is 40°, were produced, and an evaluation test was conducted simulating collisions between the preforms during transportation.

[0032] This impact test was carried out on 10 preforms according to the present invention, and it was confirmed whether or not scratches were generated on the mouth of each container. As a result, 8 out of 10 were undamaged. Dents were confirmed on the remaining 2, but dents were not confirmed at the connection point between the arc portion and the inner peripheral surface. In contrast, a similar test was carried out on 10 preforms with a mouth that was not subjected to conventional chamfering, and dents were confirmed on 10 out of 10 preforms. Therefore, it was confirmed that the container mouth of the present invention can reduce the occurrence of dents on the container mouth, particularly the occurrence of dents at the connection point between the arc portion and the inner peripheral surface. [Industrial Applicability]

[0033] The container mouth of the present invention can be suitably used in industrial fields related to containers to which caps are attached. [Explanation of symbols]

[0034] 1 Bottle container 2 Container body 3 Shoulder 4. Torso 5 Bottom 10 Container opening 11 Thread 12 Top 13 Inner surface 14 Arc section 15 Second arc section 16 Third arc 17 Outer surface 20 Cap 21 Top plate 22 Cylinder part 23 Outer Ring 24 Inner Ring 25 threads T tangent E1 Virtual extension line of the arc E2 Virtual extension line of inner circumference E3 Virtual extension of the top surface A1 Connection point between arc and top surface A2 Intersection of the imaginary extension of the arc section and the top surface or the imaginary extension of the top surface B1 Connection point between the arc and the inner surface B2 Intersection of the imaginary extension line of the arc section and the inner circumferential surface or the imaginary extension line of the inner circumferential surface D Distance H distance P Preform

Claims

1. A container mouth portion that is provided on a container body and is sealed when a cap having a seal portion therein is attached to the container body and the seal portion comes into contact with an inner peripheral surface of the container mouth portion, a first arcuate portion that is convex toward the inside is formed between the top surface and the inner circumferential surface of the container mouth, A tangent to a virtual extension line of the first arc portion has a contact point at an intersection of the virtual extension line of the first arc portion and a virtual extension line of the top surface, and an angle between the top surface and the tangent line is 30° to 50°; a second arc portion is formed between the first arc portion and the top surface so as to be inscribed in both of them, and a third arc portion is formed between the first arc portion and the inner circumferential surface so as to be inscribed in both of them, The distance from the intersection of the imaginary extension line of the first arcuate portion and the imaginary extension line of the inner circumferential surface to the imaginary extension line of the top surface is 0.3 mm to 1.0 mm. A container mouth portion characterized by:

2. 2. The container mouth according to claim 1, wherein the first arcuate portion has a radius of curvature of 6 mm or less.

3. A container mouth portion as described in claim 1 or 2, characterized in that the distance from the intersection of the imaginary extension line of the first arc portion and the imaginary extension line of the top surface to the imaginary extension line of the inner surface is 0.3 mm to 3.0 mm.

4. A resin container comprising the container mouth portion according to any one of claims 1 to 3.

5. A preform comprising a container mouth portion according to any one of claims 1 to 3.

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