JP6535786B2 - Bottle - Google Patents

Description

  The present invention relates to a bottle.

As a bottle formed of a synthetic resin material in a bottomed cylindrical shape, conventionally, a plurality of circumferential grooves continuously extending over the entire circumference of the body portion are formed at intervals in the vertical direction, so that the bottle diameter of the body portion A configuration is known in which the rigidity in the direction is increased.
As a bottle of this type, in recent years, for example, as shown in Patent Document 1 below, a plurality of circumferential grooves have the same shape that periodically extend along the circumferential direction while bending in the vertical direction in a side view of the trunk A configuration exhibiting the same large wave shape has been proposed.

Patent No. 3515848 gazette

  However, in the conventional bottle, the buckling strength may be reduced by forming the circumferential groove.

  Then, this invention is made in view of such a situation, The objective is to provide the bottle which can suppress the fall of the buckling strength by having formed the circumferential groove.

In order to solve the above problems and achieve such an object, the bottle of the present invention is a bottle formed of a synthetic resin material in a bottomed cylindrical shape, and is continuously provided on the body part over the entire circumference. A plurality of extending circumferential grooves are formed at intervals in the vertical direction, and each circumferential groove has a wave shape periodically extending along the circumferential direction while being bent in the vertical direction in a side view of the trunk, in the vertical direction The circumferential positions of the tops of adjacent circumferential grooves are offset from each other, and among circumferential grooves adjacent in the vertical direction, the tops of one circumferential groove are adjacent in the circumferential direction in the other circumferential groove. The plurality of circumferential grooves are disposed on the body in a state in which the circumferential positions of all the apexes are offset from each other within the range of the circumferential region in which the intermediate portion located between the apexes is located. The circumferential grooves adjacent in the vertical direction are the vertical direction in which one circumferential groove is located And the region, characterized in that the vertical direction of the area and the other circumferential groove located, is arranged in the barrel so as not to overlap.

According to the present invention, since the plurality of circumferential grooves are formed in the barrel, the rigidity of the barrel in the bottle radial direction can be enhanced.
Further, since the circumferential groove has a wave shape in a side view of the barrel and the phases of the circumferential grooves adjacent in the vertical direction are shifted from each other, when the axial force in the compression direction is applied to the bottle, the barrel However, it becomes possible to suppress compressive deformation so as to narrow the groove width of the circumferential groove over the entire circumference, and it is possible to suppress a decrease in buckling strength due to the formation of the circumferential groove.
In addition, since the circumferential positions of the apexes of circumferential grooves adjacent to each other in the vertical direction are shifted from each other, in the trunk portion, in the portion positioned between circumferential grooves adjacent to each other in the vertical direction, the vertical direction It is possible to prevent the occurrence of a part where the size of the part is excessively narrowed, and it is possible to make it difficult to generate a place where stress concentrates on the body part.

  Here, among the circumferential grooves adjacent to each other in the vertical direction, the circumferential grooves located below in the plurality of circumferential grooves are the same around the bottle axis in the same direction in the circumferential direction with respect to the circumferential grooves located above It may be arranged on the body in an angularly offset state.

Further, the circumferential grooves may be formed in the same shape and size.
In this case, the above-mentioned effects are surely achieved.

  Further, the bottom wall portion of the bottom portion has a ground contact portion located at the outer peripheral edge portion, a rising peripheral wall portion extending from the inner side in the bottle radial direction to the ground portion and extending upward, and a bottle diameter from the upper end portion of the rising peripheral wall portion An annular movable wall portion projecting inward in the direction, and a depressed peripheral wall portion extending upward from a bottle radial direction inner end portion of the movable wall portion, the movable wall portion being the depressed peripheral wall In order to move the part in the vertical direction, it may be disposed so as to be rotatable around the connection portion with the rising peripheral wall part.

  In this case, since the movable wall portion is disposed rotatably about the connection portion with the rising peripheral wall portion so as to move the depressed peripheral wall portion in the vertical direction, the movable wall portion is movable when the internal pressure of the bottle fluctuates By rotating the wall, the internal pressure fluctuation can be absorbed.

  ADVANTAGE OF THE INVENTION According to the bottle which concerns on this invention, the fall of the buckling strength by having formed the circumferential groove can be suppressed.

It is a side view of the bottle shown as one embodiment concerning the present invention. It is a bottom view of the bottle shown in FIG. It is the sectional view on the AA line arrow of the bottle shown in FIG. It is the schematic which shows the pressure reduction state of the bottle of FIG. It is a side view of the bottle shown as a 2nd embodiment concerning the present invention. It is a side view of the bottle shown as a 3rd embodiment concerning the present invention. It is a side view of the bottle shown as a reference example concerning the present invention. It is a side view of the bottle shown as a comparative example concerning the present invention.

Hereinafter, a bottle according to an embodiment of the present invention will be described with reference to the drawings.
The bottle 1 which concerns on this embodiment is provided with the opening 11, the shoulder 12, the trunk | drum 13, and the bottom 14, as shown in FIG. 1, and in the state which these positioned on the common axis of each central axis. It is set as the outline composition arranged in a row.

Hereinafter, the common axis is referred to as a bottle axis O, and in the direction of the bottle axis O, the mouth 11 side is referred to as the upper side, and the bottom 14 side is referred to as the lower side. Further, the direction orthogonal to the bottle axis O is referred to as a bottle radial direction, and the direction circling around the bottle axis O is referred to as a circumferential direction.
The bottle 1 is integrally formed of a synthetic resin material. Further, a cap (not shown) is screwed to the mouth 11. Furthermore, each of the mouth 11, the shoulder 12, the body 13, and the bottom 14 has a circular cross-sectional shape perpendicular to the bottle axis O.

A plurality of longitudinal grooves 12a extending in the bottle axis O direction along the outer peripheral surface of the shoulder portion 12 are formed at intervals in the circumferential direction.
The body portion 13 is formed in a cylindrical shape, and an intermediate portion between both end portions in the bottle axis O direction is formed to have a smaller diameter than these both end portions. A plurality of narrow grooves 16 continuously extending over the entire circumference are formed at both ends in the direction of the bottle axis O of the body 13 at intervals in the direction of the bottle axis O.

A plurality of circumferential grooves 15 extending continuously along the entire circumference of the body portion 13 are formed at intervals in the bottle axis O direction. In the illustrated example, the circumferential groove 15 is wider than the narrow groove 16. The plurality of circumferential grooves 15 are arranged at intervals in the bottle axis O direction over the entire region in the bottle axis O direction at the intermediate portion of the body portion 13.
Each of the circumferential grooves 15 has the same shape and size as each other and periodically extends along the circumferential direction while bending in the direction of the bottle axis O in a side view of the body portion 13. In the illustrated example, each circumferential groove 15 makes one turn around the body 13 in a cycle of four times. That is, the circumferential groove 15 is formed to have one cycle in an angle range of 90 ° centered on the bottle axis O.
Furthermore, the circumferential grooves 15 adjacent to each other in the bottle axis O direction are separated from each other in the bottle axis O direction over the entire circumference. That is, in the circumferential groove 15 adjacent in the bottle axis O direction, the area in the bottle axis O direction in which one circumferential groove 15 is located and the area in the bottle axis O direction in which the other circumferential groove 15 is located do not overlap Are disposed on the body 13.

And in this embodiment, each phase of peripheral groove 15 which adjoins in the bottle axis O direction is mutually shifted.
Furthermore, in the present embodiment, the circumferential positions of the top portions 15a and 15b of the circumferential grooves 15 adjacent in the bottle axis O direction are mutually offset. Thus, among the circumferential grooves 15 adjacent to each other in the bottle axis O direction, the apexes 15a and 15b of one circumferential groove 15 are positioned between the apexes 15a and 15b circumferentially adjacent to each other on the other circumferential groove 15 The intermediate portion 15c is located within the range of the circumferential region where the intermediate portion 15c is located. In the illustrated example, the circumferential grooves 15 adjacent to each other in the bottle axis O direction are arranged on the trunk portion 13 so that the positions in the circumferential direction of 11.25 ° about the bottle axis O are mutually shifted.
In the illustrated example, as the tops 15a and 15b, in a side view of the body 13, the form (hereinafter referred to as the upper top) 15a exhibiting a convex curve upward and the form presenting a convex curve downward (Hereinafter referred to as the lower top 15b).

The bottom portion 14 has a heel portion 17 whose upper end opening is connected to the lower end opening portion of the trunk portion 13 and a bottom wall portion 19 which closes the lower end opening portion of the heel portion 17 and whose outer peripheral portion is a ground portion 18. And are formed in a cup shape.
The bottom wall 19 is, as shown in FIGS. 2 and 3, connected to the ground portion 18 from the inner side in the bottle radial direction and extending upward from the upper end of the rising peripheral portion 21 and the bottle peripheral direction from the upper end thereof. It has an annular movable wall 22 projecting inward and a depressed peripheral wall 23 extending upward from the inner end of the movable wall 22 in the bottle radial direction, and the movable wall 22 is depressed In order to move the peripheral wall portion 23 in the direction of the bottle axis O, the peripheral wall portion 23 is disposed rotatably around a curved surface portion (a connection portion with the rising peripheral wall portion 21) 25 described later.

The movable wall portion 22 is disposed coaxially with the bottle axis O, and is formed in a downwardly curved curved shape. The movable wall portion 22 and the rising peripheral wall portion 21 are connected upward via a curved surface portion 25 which protrudes.
The depressed peripheral wall portion 23 is disposed coaxially with the bottle axis O, continuously connected to the inner end portion of the movable wall portion 22 in the bottle radial direction, and gradually reduced in diameter toward the upper side from the lower side. In addition, the depressed peripheral wall portion 23 is formed in a top cylindrical shape, and includes a top wall 24 orthogonal to the bottle axis O.

In the movable wall portion 22, an annular recess 30 recessed toward the upper side is continuously extended over the entire circumference. The annular recess 30 is disposed at the movable wall portion 22 at a position shifted from the center in the bottle radial direction to the inside in the bottle radial direction.
The annular recess 30 has a projecting end portion 34 formed in a curved shape protruding upward, an outer curved wall 32 connected to the projecting end portion 34 from the outside in the bottle radial direction, and a projecting end portion 34 from the inside in the bottle radial direction It is constituted by the inner curved wall 35 which continues.

The outer curved wall 32 extends downward as it goes from the inner side to the outer side in the radial direction of the bottle, and is formed in a downwardly curved curved shape. The upper end portion of the outer curved wall 32 is continuous with the outer end portion in the bottle radial direction of the projecting end portion 34.
The inner curved wall 35 extends upward as it goes from the inner side to the outer side in the radial direction of the bottle, and is formed in the shape of a downwardly convex curved surface. The upper end portion of the inner curved wall 35 is continuous with the inner end portion in the bottle radial direction of the projecting end portion 34.
The annular recess 30 gradually decreases in size in the bottle radial direction as it goes upward from below.

In the present embodiment, the radius of curvature of each of the movable wall portion 22, the curved surface portion 25 and the tip end portion 34 decreases in this order.
Further, the end 34 of the annular recess 30 is located below the upper end of the curved surface 25. In the annular recess 30, the whole of the projecting end 34, the outer curved wall 32 and the inner curved wall 35, the outer end of the outer curved wall 32 in the bottle radial direction, and the inner end of the inner curved wall 35 in the bottle radial direction It is located above the imaginary line L extending along the surface shape of the connecting portion with the peripheral wall portion 23). Furthermore, the distance D1 along the bottle radial direction between the curved surface portion 25 and the tip end portion 34 is greater than the distance D2 along the bottle radial direction between the tip end portion 34 and the outer peripheral edge of the top wall 24 of the depressed peripheral wall portion 23 It is getting longer.

  Then, a portion of the movable wall portion 22 located outside the projecting end 34 in the bottle radial direction, specifically, a portion located outside the outer curved wall 32 in the bottle radial direction (hereinafter referred to as the outer wall 51 Is formed thinner than the inner peripheral wall 35 (hereinafter collectively referred to as the inner side wall 52) of the depressed peripheral wall 23 and the movable wall 22.

  The bottle 1 described above is formed by biaxial stretch blow molding. That is, first, a bottomed cylindrical preform made of a synthetic resin material is formed by injection molding, and then, the preform is set in a cavity, and then air is blown into the preform to form a preform. Is expanded while extending in both directions of the bottle axis O direction and the bottle radial direction, a bottomed cylindrical bottle 1 conforming to the inner surface of the cavity is formed.

Here, in the process of biaxially stretch blow molding the preform, the momentum of the flow of the synthetic resin material is weakened when it reaches a portion of the inner surface of the cavity that forms the tip end portion 34 of the annular recess 30, The synthetic resin material forming the outer side wall 51 is stretched as compared to the synthetic resin material forming the inner side wall 52.
Thereby, the outer wall 51 is formed thinner than the inner wall 52, and when the internal pressure of the bottle 1 fluctuates, the outer wall 51 is bulged downward at the beginning as shown in FIG. 4, for example. It becomes easy to deform so that it may become plane shape from this, and this internal pressure fluctuation is absorbed effectively.

Further, since the inner curved wall 35 extends gradually upward from the inside to the outside in the radial direction of the bottle, the momentum of the flow of the synthetic resin material in the process of biaxial stretch blow molding as described above. Are effectively weakened when they reach the portion of the inner surface of the cavity that forms the tip 34 of the annular recess 30.
Furthermore, since the outer curved wall 32 gradually extends downward as going from the inner side to the outer side in the bottle radial direction, in the process of biaxial stretch blow molding as described above, an annular recess of the inner surface of the cavity The synthetic resin material which has passed through the portion forming the tip end portion 34 of the 30 flows smoothly with little resistance toward the outside in the bottle radial direction.

As described above, according to the bottle 1 according to the present embodiment, since the plurality of circumferential grooves 15 are formed in the body portion 13, the rigidity of the body portion 13 in the bottle radial direction can be enhanced.
Further, since the circumferential groove 15 has a wave shape in a side view of the body portion 13 and the phases of the circumferential grooves 15 adjacent in the bottle axis O direction are shifted from each other, an axial force in the compression direction is applied to the bottle 1 It becomes possible to suppress that the trunk | drum 13 carries out the compressive deformation so that the groove width of the circumferential groove 15 may be narrowed over the perimeter, and suppresses the fall of the buckling strength by having formed the circumferential groove 15. be able to.
Further, the circumferential positions of the tops 15a and 15b of the circumferential grooves 15 adjacent to each other in the bottle axis O direction are offset from each other, so the circumferential grooves 15 adjacent to each other in the bottle axis O direction It is possible to prevent the occurrence of a portion where the size in the direction of the bottle axis O is excessively narrowed at the portion positioned between the two, and it is possible to make it difficult to produce a portion where stress concentrates on the body portion 13.
Further, since the movable wall portion 22 is disposed rotatably about the curved surface portion 25 so as to move the depressed peripheral wall portion 23 in the bottle axis O direction, the movable wall portion 22 is movable when the internal pressure of the bottle fluctuates. By rotating the portion 22, the internal pressure fluctuation can be absorbed.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and changes and the like within the scope of the present invention are also included.

For example, in the above-described embodiment, the plurality of longitudinal grooves 12a are formed in the shoulder portion 12, but instead, for example, as illustrated in FIG. 5 to FIG. A plurality of panel surface portions 12 b may be formed in the shoulder portion 12 at intervals in the circumferential direction, and the panel surface portions 12 b may extend from one side to the other side of the circumferential direction gradually from the upper side to the lower side.
The amount of circumferential displacement of the circumferential grooves 15 adjacent to each other in the bottle axis O direction is not limited to the above embodiment, and may be changed as appropriate.

For example, as in the bottle 3 shown in FIG. 6, among the circumferential grooves 15 adjacent to each other in the bottle axis O direction, the circumferential position at which the tops 15a and 15b of one circumferential groove 15 are located and the other circumferential groove 15 The circumferential position at which the center of the middle portion 15c is located may be aligned with each other. In the illustrated example, the circumferential grooves 15 adjacent to each other in the bottle axis O direction are arranged on the trunk portion 13 at positions shifted circumferentially by 22.5 ° with respect to the bottle axis O.
Further, as in the bottle 4 shown in FIG. 7, of the circumferential grooves 15 adjacent to each other in the bottle axis O direction, the circumferential position at which the upper apex 15a of one circumferential groove 15 is located, and The circumferential positions at which the lower apexes 15 b are located may be made to coincide with each other. In the illustrated example, the circumferential grooves 15 adjacent to each other in the bottle axis O direction are arranged on the trunk portion 13 so that the positions in the circumferential direction 45 ° about the bottle axis O are mutually shifted.
Furthermore, circumferential grooves 15 adjacent in the bottle axis O direction partially overlap the region in the bottle axis O direction where one circumferential groove 15 is located and the region in the bottle axis O direction where the other circumferential groove 15 is located You may
The plurality of circumferential grooves 15 may have different shapes or may have different sizes.

The bottom part 14 may be suitably changed not only in the said embodiment.
For example, the movable wall portion 22, the depressed peripheral wall portion 23, and the annular recess 30 may not be provided, and the annular recess 30 may be intermittently dotted or extended over the entire circumference.
A plurality of annular recesses 30 may be formed at intervals in the bottle radial direction.
The cross-sectional shape of the annular recess 30 can be changed as appropriate, for example, circular or rectangular. Furthermore, the size of the annular recess 30 may be changed as appropriate.
The rising peripheral wall portion 21 may be appropriately changed, for example, extending in parallel along the bottle axis O direction, extending so as to be inclined with respect to the bottle axis O, or the like.
The movable wall portion 22 may be changed as appropriate, for example, by projecting in parallel along the bottle radial direction.

The synthetic resin material forming the bottle 1 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, etc., or a blend material thereof.
The bottle 1 is not limited to a single layer structure, and may be a laminated structure having an intermediate layer. Examples of the intermediate layer include a layer made of a resin material having gas barrier properties, a layer made of a recycled material, and a layer made of a resin material having oxygen absorbability.
In the embodiment described above, the cross-sectional view shape orthogonal to the bottle axis O of each of the shoulder portion 12, the body portion 13 and the bottom portion 14 is a circular shape, but not limited to this. It is also good.
Although the case where the outer side curved wall 32 and the inner side curved wall 35 were located above the imaginary line L was demonstrated in embodiment mentioned above, it is not restricted to this.

  In addition, it is possible to replace components in the above-described embodiment with known components as appropriate without departing from the spirit of the present invention, and the above-described modifications may be combined as appropriate.

  Next, the verification test of the effect demonstrated above is demonstrated.

Example 1 adopts the bottle 1 shown in FIG. 1 and Example 2 adopts the bottle 2 shown in FIG. 5 and Example 3 adopts the bottle 3 shown in FIG. 6 as a reference example FIG. 7 The bottle 4 shown in FIG. 8 was adopted, and as a comparative example, a bottle 100 having a circumferential groove 15 extending straight continuously over the entire circumference as shown in FIG. 8 was adopted.
In the bottle 2 of the second embodiment, circumferential grooves 15 adjacent to each other in the direction of the bottle axis O mutually shift the positions in the circumferential direction of 11.25 ° with respect to the bottle axis O, similarly to the bottle 1 of the first embodiment. It is disposed on the body 13. Further, in the bottle 100 of the comparative example, instead of forming the vertical groove 12a and the panel surface portion 12b in the shoulder portion 12, the step portion 101 extending over the entire circumference is distributed in the central portion of the shoulder portion 12 in the bottle axis O direction. Further, annular grooves 102 were separately formed at both ends of the barrel 13 in the direction of the bottle axis O.
And about each bottle, the buckling strength in the state filled with the content was measured.
As a result, it is 949.72 N in the bottle 1 of the example 1, 100.59 N in the bottle 2 of the example 2, and 1030.70 N in the bottle 3 of the example 3, 1110. It is 39 N, is 151.88 N in the bottle 100 of the comparative example, and it is confirmed that the buckling strength is improved in the bottles 1 to 4 of the examples 1 to 3 and the reference example as compared with the bottle 100 of the comparative example. The

1-4 bottle 13 body 14 bottom 15 circumferential groove 15a, 15b top 18 ground part 19 bottom wall 21 rising wall 22 movable wall 23 recessed wall 25 curved surface (connection with rising wall)

Claims (3)

A bottomed cylindrical bottle made of a synthetic resin material,
A plurality of circumferential grooves extending continuously along the entire circumference are formed in the trunk portion at intervals in the vertical direction,
Each circumferential groove has a wave shape that periodically extends along the circumferential direction while bending in the vertical direction in a side view of the trunk portion,
The circumferential positions of the tops of circumferential grooves adjacent in the vertical direction are mutually offset,
Of the circumferential grooves adjacent in the vertical direction, the crests in one circumferential groove are positioned within the circumferential region in which the intermediate portion located between the crests adjacent in the circumferential direction is located in the other circumferential groove And
The plurality of circumferential grooves are disposed on the body in a state where the circumferential positions of all the tops are mutually offset ,
The circumferential grooves adjacent to each other in the vertical direction are arranged on the body so that the region in the vertical direction in which one circumferential groove is positioned and the region in the vertical direction in which the other circumferential groove is positioned do not overlap. Characterized bottle. In the bottle according to claim 1,
Among the circumferential grooves adjacent to each other in the vertical direction, the circumferential grooves located in the lower part of the plurality of circumferential grooves are shifted at the same angle around the bottle axis in the same direction in the circumferential direction with respect to the circumferential groove located above A bottle which is disposed on the body in a closed state. In the bottle according to claim 1 or 2 ,
The respective circumferential grooves are formed in the same shape and size as each other.

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