Heat-resistant bottle

Abstract

To provide a heat-resisting bottle adapted to enhance the diametrical rigidity of a belly while maintaining the strength of buckling.SOLUTION: A heat-resisting bottle includes a mouth 11, a shoulder 12, a belly 13, and a bottom 14 that are successively provided from above toward below in this order along a bottle axis-O direction and formed integrally of a synthetic resin material, so as to form a deeper groove 35 continuously extending throughout an overall circumference in a central portion in a bottle-axis direction of the belly, and shallower grooves 36 continuously extending throughout an overall circumference and smaller in depth than the deeper groove, in portions lying on both sides with respect to the deeper groove in the bottle-axis direction of the belly. The deeper groove and the shallower groove have both side faces 35a, 36a, in respective inner surfaces, extending in a direction broadening in groove width as going from inner to outer diametrically, and inclining 30° or greater and 45° or smaller with respect to a horizontal line orthogonal to the bottle axis.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heat-resistant bottle.

Background Art

[0002] Conventionally, as shown in Patent Document 1 below, for example, a mouth part, a shoulder part, a body part, and a bottom part are connected in this order from above to below along the bottle axis direction and are integrally formed of a synthetic resin material, and a plurality of circumferential grooves continuously extending over the entire circumferential length are formed in the body part at intervals in the bottle axis direction. A heat-resistant bottle is known. In this heat-resistant bottle, for example, even if the pressure is reduced due to a temperature change of the contents or water permeation, etc., the body part is reinforced by a plurality of circumferential grooves, so that deformation of the body part can be suppressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, for example, in order to cope with thinning, etc., if the groove depth of a plurality of circumferential grooves is increased to increase the radial rigidity of the body part, the buckling strength may decrease, or if a label is provided on the body part, there is a risk that wrinkles or tears may easily occur on the label.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat-resistant bottle capable of increasing the radial rigidity of the body part while maintaining the buckling strength.

Means for Solving the Problems

[0006] To solve the above problems, the present invention employs the following means. That is, the heat-resistant bottle of the present invention has a mouth portion, a shoulder portion, a body portion, and a bottom portion that are connected in this order from above to below along the bottle axis direction and are integrally formed of a synthetic resin material. A deep groove portion that continuously extends over the entire circumferential length is formed at the central portion of the body portion in the bottle axis direction. In the body portion, shallow groove portions that continuously extend over the entire circumferential length and are shallower than the deep groove portion are formed on both sides sandwiching the deep groove portion in the bottle axis direction. Both side surfaces of the inner surfaces of the deep groove portion and the shallow groove portion extend in a direction in which the groove width widens from the inner side to the outer side in the radial direction and are inclined at 30° or more and 45° or less with respect to a horizontal line perpendicular to the bottle axis. (k) One deep groove portion is provided, and a plurality of the same number of shallow groove portions are provided on both sides of the deep groove portion sandwiching the deep groove portion in the bottle axis direction, and the shapes and sizes of all the shallow groove portions are the same. .

[0007] According to the present invention, instead of making all of the plurality of circumferential grooves formed in the body portion into deep groove portions, the deep groove portion is located only at the central portion in the bottle axis direction where the rigidity is the lowest in the body portion. Therefore, while maintaining the buckling strength, the radial rigidity of the body portion can be increased, and even if a label is provided on the body portion, it is possible to make it difficult for the label to wrinkle or tear. Since both side surfaces of the inner surfaces of the deep groove portion and the shallow groove portion extend in a direction in which the groove width widens from the inner side to the outer side in the radial direction and are inclined at 30° or more and 45° or less with respect to the horizontal line, it is possible to surely increase the radial rigidity of the body portion while maintaining the buckling strength. That is, when the inclination angle of both side surfaces of the inner surfaces of the deep groove portion and the shallow groove portion with respect to the horizontal line is less than 30°, the body portion is likely to be compressed and deformed in the bottle axis direction so as to narrow the groove width, and there is a risk that the buckling strength will decrease. When the inclination angle exceeds 45°, it becomes difficult to increase the radial rigidity of the body portion.

[0008] The inclination angles of both side surfaces of the deep groove portion and the shallow groove portion with respect to the horizontal line may all be equal to each other.

[0009] In this case, since the inclination angles of both side surfaces of the deep groove portion and the shallow groove portion with respect to the horizontal line are all equal to each other, it becomes possible to make it difficult for a stress concentration site to occur in the body portion, and while maintaining the buckling strength, the radial rigidity of the body portion can be surely increased.

[0010] The depth of the deep groove portion may be 2 times or less the depth of the shallow groove portion.

[0011] In this case, since the depth of the deep groove portion is 2 times or less the depth of the shallow groove portion, the radial rigidity of the body portion can be increased while maintaining the buckling strength.

[0012] One deep groove portion may be provided, and the same number of shallow groove portions may be provided on both sides of the deep groove portion sandwiching it in the bottle axis direction.

[0013] In this case, since the same number of shallow groove portions are provided on both sides of the deep groove portion sandwiching it in the bottle axis direction, it becomes possible to make it difficult for a stress concentration site to occur in the body portion. Since one deep groove portion is provided, the buckling strength and the radial rigidity of the body portion can be surely maintained.

[0014] The deep groove portion and the shallow groove portion may be provided at equal intervals in the bottle axis direction on the body portion.

[0015] In this case, since the deep groove portion and the shallow groove portion are provided at equal intervals in the bottle axis direction on the body portion, it becomes possible to make it difficult for a stress concentration site to occur in the body portion.

Advantages of the Invention

[0016] According to this invention, while maintaining the buckling strength, the radial rigidity of the body portion can be increased.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0018] Hereinafter, with reference to the drawings, an embodiment of the present invention will be described. As shown in FIG. 1, the heat-resistant bottle 1 according to this embodiment has a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14 connected in this order from above downward along the bottle axis O direction, and is integrally formed of a synthetic resin material. The heat-resistant bottle 1 is formed, for example, by biaxial stretch blow molding or the like.

[0019] The mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 are each formed in a cylindrical shape and are arranged coaxially with the bottle axis O. Hereinafter, when viewed from the bottle axis O direction, the direction intersecting the bottle axis O is referred to as the radial direction, and the direction orbiting around the bottle axis O is referred to as the circumferential direction.

[0020] A cap (not shown) is screwed onto the mouth portion 11. The shoulder portion 12 expands in diameter from the upper side to the lower side. A first annular concave groove 16 is continuously formed over the entire circumferential length at the connection portion between the shoulder portion 12 and the body portion 13. Among the body portion 13, the portions located inside in the bottle axis O direction from both ends in the bottle axis O direction are formed to have a smaller diameter than both ends in the bottle axis O direction. The length in the bottle axis O direction of the portions of the body portion 13 located inside in the bottle axis O direction from both ends in the bottle axis O direction is longer than half of the length of the heat-resistant bottle 1 in the bottle axis O direction.

[0021] A second annular concave groove 20 is continuously formed over the entire circumferential length at the connection portion between the body portion 13 and the bottom portion 14. The bottom portion 14 is formed in a cup shape including a heel portion 17 whose upper end opening is connected to the lower end opening of the body portion 13, and a bottom wall portion 19 that closes the lower end opening of the heel portion 17 and whose outer peripheral edge portion is a grounding portion 18.

[0022] Of the heel portion 17, the heel lower end portion 27 that is continuous from the radially outer side to the grounding portion 18 is formed to have a smaller diameter than the upper heel portion 28 that is continuous from above to the heel lower end portion 27. The upper heel portion 28, together with both end portions of the body portion 13 in the bottle axis O direction, forms the maximum outer diameter portion of the heat-resistant bottle 1. A third annular concave groove 31 having substantially the same depth as the second annular concave groove 20 is continuously formed over the entire circumferential length on the upper heel portion 28.

[0023] The outer diameters of the upper heel portion 28 and both end portions of the body portion 13 in the bottle axis O direction are, for example, 62.2 mm or more and 68.5 mm or less, and are about 66 mm in the illustrated example. The length of the heat-resistant bottle 1 in the bottle axis O direction is, for example, 198 mm or more and 220 mm or less, and is about 206 mm in the illustrated example. The internal volume of the heat-resistant bottle 1 is, for example, 400 ml or more and 600 ml or less, and in the illustrated example, the heat-resistant bottle 1 is for 500 ml. Note that each of the above numerical values may be changed as appropriate.

[0024] The bottom wall portion 19 includes a rising peripheral wall portion 21 that is continuous from the inside in the bottle diameter direction to the grounding portion 18 and extends upward, an annular movable wall portion 22 that extends radially inward from the upper end portion of the rising peripheral wall portion 21, and a sunken peripheral wall portion 23 that extends upward from the radially inner end portion of the movable wall portion 22. Note that the bottom wall portion 19 may be appropriately changed, for example, by adopting a configuration without the movable wall portion 22.

[0025] The rising peripheral wall portion 21 has a reduced diameter as it extends from bottom to top. The movable wall portion 22 is formed in a convex curved surface shape facing downward, and extends downward as it extends from the radially outer side to the inner side. The movable wall portion 22 and the rising peripheral wall portion 21 are connected via a convex curved surface portion 25 facing upward. The movable wall portion 22 is rotatable about the curved surface portion 25 so as to move the sunken peripheral wall portion 23 upward. When the pressure inside the heat-resistant bottle 1 is reduced, the movable wall portion 22 moves upward around the curved surface portion 25, thereby suppressing a decrease in the internal pressure of the heat-resistant bottle 1.

[0026] And in this embodiment, a deep groove portion 35 and a shallow groove portion 36 are formed in the barrel portion 13. The deep groove portion 35 and the shallow groove portion 36 are provided at equal intervals in the bottle axis O direction in the barrel portion 13. The groove widths of the deep groove portion 35 and the shallow groove portion 36 are equal to each other. In the illustrated example, the groove width of the deep groove portion 35 is slightly wider than the groove width of the shallow groove portion 36.

[0027] The deep groove portion 35 extends continuously over the entire circumferential length and is provided at the central portion of the barrel portion 13 in the bottle axis O direction. The shallow groove portion 36 extends continuously over the entire circumferential length and is provided at each portion of the barrel portion 13 located on both sides sandwiching the deep groove portion 35 in the bottle axis O direction. The depth of the shallow groove portion 36 is shallower than the depth of the deep groove portion 35. The depth of the deep groove portion 35 is not more than 2 times the depth of the shallow groove portion 36, specifically 1.01 times or more and 2 times or less, preferably 1.1 times or more and 1.5 times or less. The depth of the deep groove portion 35 is less than 3.5 mm.

[0028] Both side surfaces 35a and 36a on the inner surfaces of the deep groove portion 35 and the shallow groove portion 36 face the bottle axis O direction. Both side surfaces 35a and 36a of the deep groove portion 35 and the shallow groove portion 36 extend in a direction in which the groove width becomes wider from the inner side to the outer side in the radial direction, and are inclined at 30° or more and 45° or less with respect to a horizontal line orthogonal to the bottle axis O. The respective inclination angles of both side surfaces 35a and 36a of the deep groove portion 35 and the shallow groove portion 36 with respect to the horizontal line are all equal to each other. That is, the difference between the maximum value and the minimum value of the respective inclination angles of both side surfaces 35a and 36a of the deep groove portion 35 and the shallow groove portion 36 with respect to the horizontal line is not more than 10% of the inclination angle of both side surfaces 35a of the deep groove portion 35.

[0029] In the illustrated example, the inclination angles of the both side surfaces 35a of the deep groove portion 35 and the inclination angles of the both side surfaces 36a of the shallow groove portion 36 are the same as each other. The deep groove portion 35 and the shallow groove portion 36 exhibit a symmetrical shape with respect to the horizontal line passing through the central portion in the direction of the bottle axis O in a longitudinal sectional view along the bottle axis O. The groove bottom surfaces 35b, 36b on the inner surfaces of the deep groove portion 35 and the shallow groove portion 36 respectively extend straight in the direction of the bottle axis O. Incidentally, each of the groove bottom surfaces 35b, 36b may be formed in a concave curved surface shape that is recessed toward the inner side in the radial direction. The groove bottom surfaces 35b, 36b and the both side surfaces 35a, 36a are continuously connected without a step via a concave curved surface portion. The opening peripheral edge portions of the deep groove portion 35 and the shallow groove portion 36 on the outer peripheral surface of the body portion 13 are formed in a protruding curved surface shape, and connect the both side surfaces 35a, 36a and the outer peripheral surface of the body portion 13 without a step.

[0030] One deep groove portion 35 is provided, and the shallow groove portions 36 are provided in the same number on both sides sandwiching the deep groove portion 35 in the direction of the bottle axis O. In the illustrated example, two shallow groove portions 36 are provided on both sides sandwiching the deep groove portion 35 in the direction of the bottle axis O.

[0031] As described above, according to the heat-resistant bottle 1 according to the present embodiment, not all of the plurality of circumferential grooves formed in the body portion 13 are the deep groove portion 35, but only in the central portion in the direction of the bottle axis O where the rigidity is the lowest in the body portion 13, the deep groove portion 35 is positioned. Therefore, while maintaining the buckling strength, the radial rigidity of the body portion 13 can be increased, and even if a label is provided on the body portion 13, it is possible to make it difficult for the label to have wrinkles or tears.

[0032] Since the both side surfaces 35a, 36a on the inner surfaces of the deep groove portion 35 and the shallow groove portion 36 respectively extend in a direction in which the groove width becomes wider as going from the inner side to the outer side in the radial direction and are inclined at 30° or more and 45° or less with respect to the horizontal line, while maintaining the buckling strength, the radial rigidity of the body portion 13 can be surely increased. That is, when the inclination angles of both side surfaces 35a and 36a on the inner surfaces of the deep groove portion 35 and the shallow groove portion 36 with respect to the horizontal line are less than 30°, the body portion 13 is likely to be compressed and deformed in the bottle axis O direction so as to narrow the groove width, and there is a risk that the buckling strength decreases. When the inclination angle exceeds 45°, it becomes difficult to increase the radial rigidity of the body portion 13.

[0033] Since the inclination angles of both side surfaces 35a and 36a of the deep groove portion 35 and the shallow groove portion 36 with respect to the horizontal line are all equal to each other, it becomes possible to make it difficult to generate a stress concentration site in the body portion 13, and while maintaining the buckling strength, the radial rigidity of the body portion 13 can be surely increased.

[0034] Since the depth of the deep groove portion 35 is not more than twice the depth of the shallow groove portion 36, the radial rigidity of the body portion 13 can be increased while maintaining the buckling strength. Since the shallow groove portions 36 are provided in the same number on both sides of the deep groove portion 35 sandwiching it in the bottle axis O direction, it is possible to make it difficult to generate a stress concentration site in the body portion 13. Since one deep groove portion 35 is provided, the buckling strength and the radial rigidity of the body portion 13 can be surely maintained. Since the deep groove portion 35 and the shallow groove portion 36 are provided at equal intervals in the bottle axis O direction on the body portion 13, it is possible to make it difficult to generate a stress concentration site in the body portion 13.

[0035] Note that the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0036] For example, in the above-described embodiment, the total number of the deep groove portion 35 and the shallow groove portion 36 is an odd number, but it may be an even number of 4 or more. In this case, two deep groove portions 35 are provided at intervals in the bottle axis O direction at the central portion of the body portion 13 in the bottle axis O direction.

[0037] In addition, the synthetic resin material forming the heat-resistant bottle 1 may be appropriately changed, such as polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material thereof, etc. Furthermore, the heat-resistant bottle 1 may be not limited to a single-layer structure but may be a laminated structure having an intermediate layer. Examples of this intermediate layer include a layer made of a resin material having gas barrier properties, a layer made of recycled material, a layer made of a resin material having oxygen absorption properties, or a combination of these layers, or a vapor deposition layer, etc.

[0038] In addition, within the scope not departing from the gist of the present invention, it is possible to appropriately replace the components in the above-described embodiment with well-known components, and the above-described modified examples may also be appropriately combined.

[0039] Next, a verification test regarding the above-described effects will be described.

[0040] As an example, a heat-resistant bottle 1 was adopted in which the depth of the deep groove portion 35 was about 3.0 mm, the depth of the shallow groove portion 36 was about 2.5 mm, and the inclination angle of both side surfaces 35a and 36a of the deep groove portion 35 and the shallow groove portion 36 with respect to the horizontal line was about 34°. As a comparative example, a heat-resistant bottle was adopted in which the depth of the deep groove portion was about 3.4 mm, the depth of the shallow groove portion was about 2.5 mm, and the inclination angle of both side surfaces of the deep groove portion and the shallow groove portion with respect to the horizontal line was about 20°.

[0041] After filling the heat-resistant bottles of the example and the comparative example with water at about 85°C, when cooling with a cap attached to the mouth portion, it was visually confirmed whether the body portion was deformed or not. As a result, no abnormal deformation was visually observed in each of the heat-resistant bottles of the example and the comparative example.

[0042] Next, an axial compressive force in the bottle axis direction was applied to the same heat-resistant bottle filled with the water and in which no abnormal deformation was visually observed, and the axial compressive force (buckling strength) in the bottle axis direction when each heat-resistant bottle buckled was measured. As a result, it was confirmed that the buckling strength of the heat-resistant bottle 1 in the example was 1.64 times that of the heat-resistant bottle in the comparative example.

Explanation of symbols

[0043] 1 Heat-resistant bottle 11 Mouth part 12 Shoulder part 13 Body part 14 Bottom part 35 Deep groove part 35a, 36a Both side surfaces 36 Shallow groove part O Bottle axis

Claims

1. The mouth part, the shoulder part, the body part, and the bottom part are connected in this order from above to below along the bottle axis direction and are integrally formed of a synthetic resin material. A deep groove part that continuously extends over the entire circumferential length is formed at the central part of the body part in the bottle axis direction. In the body part, shallow groove parts that continuously extend over the entire circumferential length and are shallower than the deep groove part are formed on both sides sandwiching the deep groove part in the bottle axis direction. Both side surfaces on the inner surfaces of the deep groove part and the shallow groove part extend in a direction in which the groove width widens from the inner side to the outer side in the radial direction and are inclined at 30° or more and 45° or less with respect to a horizontal line perpendicular to the bottle axis. One deep groove part is provided. A plurality of the same number of shallow groove parts are provided on both sides sandwiching the deep groove part in the bottle axis direction. A heat-resistant bottle in which the shapes and sizes of all the shallow groove parts are the same.

2. The heat-resistant bottle according to claim 1, wherein the inclination angles of both side surfaces of the deep groove part and the shallow groove part with respect to the horizontal line are all equal to each other.

3. The heat-resistant bottle according to claim 1 or 2, wherein the depth of the deep groove part is 2 times or less the depth of the shallow groove part.

4. The heat-resistant bottle according to any one of claims 1 to 3, wherein the deep groove part and the shallow groove part are provided at equal intervals in the bottle axis direction in the body part.

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