JP6438835B2 - Bottle with constricted shoulder - Google Patents

Description

  The present invention relates to a bottle having a constricted shoulder.

  2. Description of the Related Art Conventionally, as a bottle formed of a synthetic resin material in a bottomed cylindrical shape, a configuration in which a mouth portion, a shoulder portion, a trunk portion, and a bottom portion are connected in this order along the bottle axial direction is known.

  By the way, in the above-described bottle, for example, from the viewpoint of improving design properties, the shoulder portion, the mouth portion, and the body portion are formed in a curved shape protruding toward the outside of the bottle, and the shoulder portion. Has been studied (see Patent Document 1 below, for example). In this case, the shoulder portion is located on the mouth portion side, and is located on the trunk portion side, with a linear upper shoulder portion extending gradually toward the outside in the radial direction from the mouth side toward the trunk portion side, A configuration having a curved lower shoulder that is recessed toward the inside in the radial direction is conceivable.

Japanese Utility Model Publication No. 3-1984

  However, if the above-described configuration is adopted, it is difficult to secure the rigidity of the lower shoulder portion directed inward in the radial direction. For example, when the pressure in the bottle is reduced, the lower shoulder portion is greatly deformed inward in the radial direction. There is a possibility that it becomes easy to do.

  Then, this invention is made | formed in view of the situation mentioned above, Comprising: After improving the designability, providing the bottle which has a neck-shaped shoulder part which can ensure desired decompression absorption performance. Objective.

In order to solve the above problems, the present invention proposes the following means.
The bottle according to the present invention is a bottle in which a mouth part, a shoulder part, a body part, and a bottom part are continuously provided in this order along the bottle axial direction, and the shoulder part, the mouth part, and the body part, Each connection portion is formed in a curved shape protruding toward the outside of the bottle, and the shoulder portion is formed in a constricted shape that is recessed toward the inside in the radial direction, and of these, the upper shoulder on the mouth side The portion extends linearly from the mouth side toward the body portion side, the lower shoulder portion of the body portion side is formed in a curved shape recessed toward the inside in the radial direction, and the bottle shaft of the lower shoulder portion The length in the direction is equal to or less than the length in the bottle axial direction of the upper shoulder, and the lower shoulder is recessed toward the inner side in the radial direction and extends around the entire circumference of the lower shoulder. A groove is formed.

  According to this configuration, the length of the lower shoulder portion in the bottle axis direction is equal to or less than the length of the upper shoulder portion in the bottle axis O direction, and the circumferential groove is formed in the lower shoulder portion. The rigidity of the lower shoulder portion against the inward deformation can be increased. Thereby, after improving the designability, a desired reduced pressure absorption performance (reduced pressure strength) can be ensured, and the lower shoulder can be prevented from being greatly deformed radially inward during the reduced pressure.

In the bottle according to the present invention, the circumferential groove may be 15% or more and 85% of the length of the lower shoulder portion in the bottle axial direction on the body side with respect to the end portion on the mouth portion side of the lower shoulder portion. It may be formed in the position away below.
In this case, since the circumferential groove is formed near the central portion of the lower shoulder portion in the bottle axial direction, the decompression strength of the bottle can be reliably increased.

  According to the bottle according to the present invention, desired vacuum absorption performance can be ensured after improving the design.

It is a side view of the bottle which concerns on embodiment of this invention. It is sectional drawing of the shoulder part containing a shoulder circumferential groove. It is a graph which shows the relationship between the position (mm) of a shoulder periphery groove | channel, and decompression intensity | strength (kPa).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the bottle 1 of the present embodiment has a bottomed cylindrical shape including a mouth portion 11, a shoulder portion 12, a trunk portion 13, and a bottom portion 14, and these center axes are on a common axis. It is set as the schematic structure continuously arranged in this order in the positioned state.

  Hereinafter, the above-described common axis is referred to as the bottle axis O, the mouth 11 side along the bottle axis O direction is referred to as the upper side, and the bottom 14 side is referred to as the lower side, and the bottle axis O in a plan view viewed from the bottle axis O direction. The direction orthogonal to the radial direction is referred to as the radial direction, and the direction around the bottle axis O is referred to as the circumferential direction. The bottle 1 is formed by blow molding a preform made of a synthetic resin material formed into a bottomed cylindrical shape by injection molding. Further, each of the mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 has a circular shape in a cross-sectional view orthogonal to the bottle axis O.

The bottom part 14 has a bottomed cylindrical shape. Specifically, the bottom portion 14 includes a bottom wall portion 21 whose outer peripheral edge portion is grounded, and a heel portion 22 that extends upward from the outer peripheral edge portion of the bottom wall portion 21.
The body portion 13 has a cylindrical shape, and the lower end edge thereof is continuous with the upper end edge of the heel portion 22. The trunk portion 13 is formed with a trunk circumferential groove 23 that is recessed inward in the radial direction and extends over the entire circumference in the circumferential direction. In the illustrated example, a plurality of body circumferential grooves 23 are formed at intervals in the bottle axis O direction.

  The shoulder portion 12 has a constricted shape that is recessed toward the inside in the radial direction in a side view as viewed from the radial direction, and is gradually enlarged in diameter from the upper side to the lower side. The shoulder portion 12 is located at the upper portion, and linearly extends from the upper portion toward the lower portion and gradually extends toward the outer side in the radial direction. The shoulder portion 12 is located at the lower portion and is recessed toward the inner side in the radial direction. A curved lower shoulder 32.

The length of the lower shoulder portion 32 in the bottle axis O direction is shorter than that of the upper shoulder portion 31. However, the length of the lower shoulder portion 32 in the bottle axis O direction may be equal to or less than the length of the upper shoulder portion 31 in the bottle axis O direction, for example, the lower shoulder portion 32 and the upper shoulder portion 31 in the bottle axis O direction. The lengths may be equal.
The lower shoulder portion 32 has an upper end edge connected to the lower end edge of the upper shoulder portion 31 from below, and a lower end edge connected to the upper end edge of the body portion 13 from above via a lower connection portion (connection portion) 34. Note that the lower connection portion 34 has a curved surface shape protruding outward in the radial direction, and smoothly connects the upper end edge of the body portion 13 and the lower end edge of the lower shoulder portion 32. In addition, if the diameter of the lower shoulder portion 32 is gradually increased from the upper side to the lower side, the radius of curvature may be uniform over the entire bottle axis O direction, depending on the position in the bottle axis O direction. The curvature radius may be varied.

  Here, the lower shoulder portion 32 is formed with a shoulder circumferential groove (circumferential groove) 35 that is recessed toward the inside in the radial direction and extends over the entire circumference in the circumferential direction. As shown in FIG. 2, the shoulder circumferential groove 35 has a curved shape that is recessed toward the inside in the radial direction in a longitudinal sectional view along the bottle axis O direction. Both ends of the shoulder circumferential groove 35 in the bottle axis O direction and the shoulder portion 12 are connected to each other via a curved surface portion 36 protruding outward in the radial direction. The shoulder circumferential groove 35 may be at least partially located in the lower shoulder portion 32. That is, the shoulder circumferential groove 35 may be formed in the lower shoulder portion 32 as a whole in the bottle axis O direction, and is formed so as to straddle the boundary portion between the upper shoulder portion 31 and the lower shoulder portion 32 in the bottle axis O direction. Also good. In the illustrated example, the curvature radii R1 and R2 of the shoulder circumferential groove 35 and the curved surface portion 36 are the same.

As shown in FIG. 1, a neck ring 41 projects from the center of the mouth portion 11 in the bottle axis O direction toward the outside in the radial direction. The neck ring 41 has an annular shape extending over the entire circumference in the circumferential direction.
A portion of the mouth portion 11 located above the neck ring 41 constitutes a mounting cylinder 42 to which a cap (not shown) is mounted. Further, a portion of the mouth portion 11 positioned below the neck ring 41 constitutes a neck portion 45 that is connected to the upper edge of the upper shoulder portion 31 via an upper connection portion (connection portion) 44. The upper connection portion 44 has a curved surface shape protruding outward in the radial direction, and smoothly connects the lower end edge of the neck portion 45 and the upper end edge of the upper shoulder portion 31.

  Thus, in the present embodiment, the length of the lower shoulder portion 32 in the bottle axis O direction is equal to or shorter than the length of the upper shoulder portion 31 in the bottle axis O direction, and the shoulder circumferential groove 35 is formed in the lower shoulder portion 32. Since it is formed, the rigidity of the lower shoulder portion 32 with respect to the deformation directed inward in the radial direction can be increased. Thereby, after improving the designability, a desired reduced pressure absorption performance (reduced pressure strength) can be secured, and the lower shoulder portion 32 can be prevented from being greatly deformed radially inward during the reduced pressure.

  Here, this inventor performed the test for verifying the pressure reduction absorption performance of the bottle 1 of this embodiment. In the following description, components corresponding to those in the above-described embodiment will be described with the same reference numerals.

  In this test, a plurality of bottles 1 in which the positions of the shoulder circumferential grooves 35 are different from each other in the bottle axis O direction were prepared, and the reduced pressure strength of each bottle 1 was measured. The bottle 1 used in this test has an internal volume of 250 ml, the ratio of the length of the upper shoulder 31 in the bottle axis O direction to the entire shoulder 12 is 54.3%, and the lower shoulder 32 The ratio of the length in the bottle axis O direction is 45.7%. In this test, the lower shoulder portion 32 has a uniform radius of curvature over the entire bottle axis O direction and a radius of curvature of 35 mm. Moreover, in this test, the depth D in the radial direction of the shoulder circumferential groove 35 is 1.5 mm, the curvature radii R1 and R2 of the shoulder circumferential groove 35 and the curved surface portion 36 are 1 mm, and the curved surface portion 36 is in the bottle axis O direction. The distance between the outer edges is 3.8 mm to 4.0 mm.

FIG. 3 is a graph showing the relationship between the position (mm) of the shoulder circumferential groove 35 and the reduced pressure strength (kPa). The position of the shoulder circumferential groove 35 in FIG. 3 is the distance from the lower end of the neck ring 41 to the center of the shoulder circumferential groove 35 in the bottle axis O direction.
As shown in FIG. 3, by forming the shoulder circumferential groove 35 in the lower shoulder portion 32, the decompression strength is increased compared to the case where the shoulder circumferential groove 35 is formed in a portion other than the lower shoulder portion 32. I understand. Further, it can be seen that the pressure reduction strength is increased by forming the shoulder circumferential groove 35 in the lower shoulder portion 32 closer to the central portion in the bottle axis O direction. In this test, when the shoulder circumferential groove 35 is formed in a portion of the lower shoulder portion 32 located above the central portion in the bottle axis O direction, the decompression strength is maximized.

  From such a result, it has been clarified that by forming the shoulder circumferential groove 35 in the lower shoulder portion 32, the rigidity of the lower shoulder portion 32 inward in the radial direction can be increased and the reduced pressure absorption performance can be secured. In this case, the pressure reduction strength is further increased by being formed at a position 15% or more and 85% or less of the length of the lower shoulder 32 in the bottle axis O direction below the upper end of the lower shoulder 32. It is preferable to make it. In particular, it is more preferable to form the shoulder circumferential groove 35 below 35% to 65% of the length of the lower shoulder 32 in the bottle axis O direction below the upper end of the lower shoulder 32. In this test, the bottle 1 for 250 ml was used, but the same effect as described above can be obtained regardless of the content of the bottle 1.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
In the above-described embodiment, the case where one shoulder circumferential groove 35 is formed in the lower shoulder portion 32 has been described. However, the present invention is not limited to this, and a plurality of shoulder circumferential grooves 35 are formed at intervals in the bottle axis O direction. It doesn't matter. In addition to the lower shoulder portion 32, a shoulder circumferential groove 35 may be formed in the upper shoulder portion 31.

Further, in the above-described embodiment, the configuration in which the upper shoulder portion 31 is inclined and extended toward the outer side in the radial direction from the upper side to the lower side has been described. However, the configuration is not limited thereto, and the configuration extends in parallel with the bottle axis O. It does not matter.
In the above-described embodiment, the case where the bottle 1 is formed by blow-molding a preform has been described. However, the present invention is not limited to this. For example, the bottle 1 may be formed by forming a parison by extrusion molding or the like and direct blow molding the parison.

  In addition, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by the well-known component, and you may combine the said modification suitably.

DESCRIPTION OF SYMBOLS 1 ... Bottle 11 ... Mouth part 12 ... Shoulder part 13 ... Trunk part 14 ... Bottom part 31 ... Upper shoulder part 32 ... Lower shoulder part 34 ... Lower side connection part (connection part)
35 ... shoulder groove (circumferential groove)
44 ... upper connection part (connection part)

Claims (2)

A bottle in which a mouth part, a shoulder part, a body part, and a bottom part are continuously arranged in this order along the bottle axial direction,
Each connection part of the shoulder part, the mouth part, and the body part is formed in a curved surface shape protruding toward the outside of the bottle,
The shoulder portion is formed in a constricted shape that is recessed toward the inside in the radial direction, and the upper shoulder portion of the mouth side extends linearly from the mouth portion side toward the trunk portion side, The lower shoulder of the trunk side is formed in a curved shape that is recessed toward the inside in the radial direction,
The length of the lower shoulder portion in the bottle axial direction is equal to or less than the length of the upper shoulder portion in the bottle axial direction,
The bottle, wherein the lower shoulder portion is recessed toward the inside in the radial direction, and a circumferential groove extending over the entire circumference of the lower shoulder portion is formed.   The circumferential groove is formed at a position 15% or more and 85% or less of the length of the lower shoulder portion in the bottle axial direction on the body side with respect to the mouth side end portion of the lower shoulder portion. The bottle according to claim 1, wherein

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