bottle

Abstract

To improve moldability of even a slim bottle.SOLUTION: A mouth 11, a shoulder 12, a trunk 13, and a bottom 14 are serially arranged vertically downward along a bottle axis O direction in this order. The trunk is formed such that a panel surface 15 and a corner surface 16 are alternately arranged in a circumferential direction along the bottle axis. The shoulder is formed such that a triangular surface 21, 22 exhibiting a triangular shape pointed upward with one corner positioned at an upper end when seen from the outside in a radial direction and a reverse triangular surface 23 exhibiting a reverse triangular shape pointed downward with one corner positioned at a lower end when seen from the outside in the radial direction are alternately arranged in the circumferential direction. The number of triangular and reverse triangular surfaces constituting the shoulder is larger than the number of panel and corner surfaces constituting the trunk.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bottle. [Background technology]

[0002] Conventionally, as shown in Patent Document 1 below, for example, bottles have been known in which the mouth, shoulder, body, and bottom are arranged in this order from top to bottom along the bottle axis, and the body and shoulder, panel surface portions, and corner surface portions are arranged alternately in the circumferential direction around the bottle axis. In recent years, there has been a demand for slimmer bottles with reduced internal volume without changing the axial distance between the top opening edge of the mouth and the bottom grounding portion, i.e., the overall height of the bottle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4864316 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with slim bottles, when blow molding a preform, the resin material comes into contact with, for example, the inner surface of the cavity that molds the shoulder portion at an early stage, causing it to cool and not stretch sufficiently, making molding difficult.

[0005] The present invention has been made in consideration of the above circumstances, and has as its object to provide a bottle that can be molded with improved ease even if it is slender. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the above object, the bottle of the present invention has a mouth portion, a shoulder portion, a body portion, and a bottom portion, which are connected in this order from top to bottom along the bottle axial direction, and the body portion is configured by panel surface portions and corner surface portions which are connected alternately in the circumferential direction around the bottle axis, and the shoulder portion is configured by triangular surface portions which, when viewed from the outside in the radial direction, have a triangular shape with one corner located at the upper end and pointed upward, and inverted triangular surface portions which, when viewed from the outside in the radial direction, have an inverted triangular shape with one corner located at the lower end and pointed downward, which are connected alternately in the circumferential direction, and the number of triangular surface portions and inverted triangular surface portions which make up the shoulder portion is greater than the number of panel surface portions and corner surface portions which make up the body portion.

[0007] According to this invention, the body portion is composed of panel surface portions and corner surface portions alternately connected in the circumferential direction, and the shoulder portion is composed of triangular surface portions and inverted triangular surface portions alternately connected in the circumferential direction, and the cross-sectional shapes of the body portion and shoulder portion are angular, so the internal volume can be kept small compared to a circular shape circumscribing this angular shape. Because the number of triangular and inverted triangular surfaces that make up the shoulder is greater than the number of panel and corner surfaces that make up the body, it is possible to provide many circumferentially adjacent corners in the shoulder, making it possible to approximate the cross-sectional shape to a circular shape and making it easier to ensure the radial distance between the outer peripheral surface of the shoulder and the bottle axis. This prevents the resin material from contacting the inner surface of the cavity that molds the shoulder at an early stage when blow molding the preform, allowing it to be sufficiently stretched, improving moldability. Since the number of triangular and inverted triangular surfaces that make up the shoulder is greater than the number of panel surfaces and corner surfaces that make up the body, compared to the conventional configuration in which the body and shoulder, panel surfaces and corner surfaces are alternately connected in the circumferential direction, it is possible to increase the number of corners, making it easier to diffusely reflect illuminated light, thereby improving the design.

[0008] A neck ring protruding radially outward may be formed at the mouth, and the distance in the bottle axial direction between the lower surface of the neck ring and the lower edge of the shoulder portion may be 40% or more and 60% or less of the distance in the bottle axial direction between the lower surface of the neck ring and the ground contact portion of the bottom.

[0009] In this case, the distance in the axial direction of the bottle between the underside of the neck ring and the lower edge of the shoulder is 40% or more and 60% or less of the distance in the axial direction of the bottle between the underside of the neck ring and the ground contact portion of the bottom.This makes it possible to increase the proportion of the internal volume of the shoulder to the internal volume of the entire bottle while maintaining good moldability, and reliably keeps the internal volume of the bottle small.

[0010] The upper part of the inverted triangular surface portion may be divided into a first small face portion which, when viewed from the outside in the radial direction, has a triangular shape with one corner located at the upper end and pointed upward, and a pair of second small face portions which, when viewed from the outside in the radial direction, have an inverted triangular shape with one corner located at the lower end and pointed downward, and which sandwich the first small face portion in the circumferential direction.

[0011] In this case, because the upper part of the inverted triangular surface located in the shoulder is divided into a first small facet and a pair of second small faces, the upper part of the shoulder, which has a smaller outer diameter and where the resin material is more likely to come into contact with the inner surface of the cavity at an early stage when blow molding the preform, can be provided with more circumferentially adjacent corners than the lower part of the shoulder, making it possible to make the cross-sectional shape closer to a circular shape. This makes it easier to ensure the radial distance between the outer peripheral surface of the upper part of the shoulder and the bottle axis, and by preventing the resin material from coming into contact with the inner surface of the cavity that molds the shoulder at an early stage when blow molding the preform, the resin material is sufficiently stretched, thereby reliably improving moldability.

[0012] The internal volume (ml) may be 1.35 to 1.85 times the distance (mm) in the axial direction of the bottle between the upper opening edge of the mouth and the ground contact portion of the bottom.

[0013] In this case, the bottle's internal volume (ml) is between 1.35 and 1.85 times the distance in the axial direction of the bottle between the upper opening edge of the mouth and the bottom ground contact area, i.e., the total height (mm) of the bottle, resulting in a slender bottle and improving the moldability of the slender bottle, thereby effectively achieving the aforementioned effects. [Effects of the Invention]

[0014] According to the present invention, it is possible to improve formability even in a slender case. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side view of a bottle according to one embodiment of the present invention; [Figure 2] FIG. 2 is a top view of the bottle shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a bottle 1 according to one embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the bottle 1 is configured by connecting a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14 in this order from top to bottom along the bottle axis O. Hereinafter, when viewed from the direction of the bottle axis O, a direction intersecting the bottle axis O is referred to as a radial direction, and a direction going around the bottle axis O is referred to as a circumferential direction.

[0017] Bottle 1 has a single-layer structure and is formed by biaxially stretching blow molding a preform formed by injection molding. The internal volume (ml) of bottle 1 is 1.35 to 1.85 times the distance in the direction of the bottle axis O between the upper opening edge of mouth 11 and ground contact portion 14a of bottom 14, i.e., the overall height A (mm) of bottle 1. In the illustrated example, the internal volume (full capacity) of bottle 1 is, for example, 345 ml, the weight of bottle 1 is 24 g, and the internal volume (ml) of bottle 1 is 1.68 times the overall height A (mm) of bottle 1. The bottle 1 is not limited to a single-layer structure but may have a laminated structure, and the laminated structure may be formed by blow molding a laminated parison that is combined in two layers (inner and outer) by extrusion molding, for example.

[0018] The mouth portion 11 extends in the direction of the bottle axis O. A male thread portion 11a is formed in the mouth portion 11. A neck ring 11b that protrudes radially outward is formed in a portion of the mouth portion 11 located between the male thread portion 11a and the lower end portion.

[0019] The body 13 and bottom 14 are configured with panel surface portions 15 and corner surface portions 16 alternately arranged in the circumferential direction. The panel surface portions 15 are wider in the circumferential direction than the corner surface portions 16. The panel surface portions 15 and corner surface portions 16 are alternately arranged in the circumferential direction via first partition ridge portions 17. There are four panel surface portions 15 and four corner surface portions 16. The panel surface portions 15 are formed with panel portions 18 that are recessed radially inward. When viewed from the radial outside, the panel portions 18 have a rectangular shape that is long in the direction of the bottle axis O.

[0020] The shoulder portion 12 is configured by alternately connecting triangular surface portions 21, 22 (shown in FIGS. 1 and 2 as hatched portions) in the circumferential direction. These triangular surface portions 21, 22 (shown as dotted hatching in FIGS. 1 and 2 ) have a triangular shape with one corner located at the upper end and pointing upward when viewed from the outside in the radial direction. The triangular surface portions 21, 22 and the inverted triangular surface portion 23 have a triangular shape with one corner located at the lower end and pointing downward when viewed from the outside in the radial direction. The triangular surface portions 21, 22 and the inverted triangular surface portion 23 are provided over the entire length of the shoulder portion 12 in the direction of the container axis O. The triangular surface portions 21, 22 and the inverted triangular surface portion 23 are alternately connected in the circumferential direction via a second partition ridge portion 26. The circumferential size of the triangular surface portions 21, 22 is greater than the circumferential size of the inverted triangular surface portion 23. The number of triangular surface portions 21, 22 and inverted triangular surface portions 23 that make up the shoulder portion 12 (16 surfaces in the illustrated example) is greater than the number of panel surface portions 15 and corner surface portions 16 that make up the body portion 13 (8 surfaces in the illustrated example). In this embodiment, the number of triangular surface portions 21, 22 and inverted triangular surface portions 23 that make up the shoulder portion 12 is more than twice the number of panel surface portions 15 and corner surface portions 16 that make up the body portion 13.

[0021] The triangular surface portions 21, 22 include a first triangular surface portion 21 whose base coincides with the upper edge of the panel surface portion 15 when viewed from the outside in the radial direction, and a second triangular surface portion 22 whose base coincides with the upper edge of the corner surface portion 16 when viewed from the outside in the radial direction. The circumferential size of the first triangular surface portion 21 is larger than the circumferential size of the second triangular surface portion 22. When viewed from the outside in the radial direction, the first triangular surface portion 21 and the second triangular surface portion 22 have an isosceles triangle shape.

[0022] The upper part of the inverted triangular surface portion 23 is divided into a first small face portion 24, which has a triangular shape with one corner located at the upper end and pointed upward when viewed from the outside in the radial direction, and a pair of second small face portions 25, which have an inverted triangular shape with one corner located at the lower end and pointed downward when viewed from the outside in the radial direction, and which sandwich the first small face portion 24 in the circumferential direction. The first small face portion 24 and the pair of second small face portions 25 are connected in the circumferential direction via a third dividing ridge portion 27. The second small face portion 25 and the triangular surface portions 21 and 22 are connected in the circumferential direction via the upper part of the second dividing ridge portion 26.

[0023] The angle of inclination of the upper part 12a of the shoulder part 12 relative to the container axis O is greater than the angle of inclination of the lower part 12b of the shoulder part 12 relative to the container axis O. The size of the upper part 12a of the shoulder part 12 relative to the container axis O is smaller than the size of the lower part 12b of the shoulder part 12 relative to the container axis O. The upper parts of the inverted triangular surface part 23 and the second partition ridge part 26 described above are located on the upper part 12a of the shoulder part 12.

[0024] The distance B in the direction of the bottle axis O between the underside of the neck ring 11b and the lower edge of the shoulder portion 12 is 40% to 60% of the distance C in the direction of the bottle axis O between the underside of the neck ring 11b and the ground contact portion 14a of the bottom portion 14. In the illustrated example, the distance B is 48.8% of the distance C.

[0025] As described above, in the bottle 1 of this embodiment, the body 13 is formed by alternately connecting the panel surface portions 15 and the corner surface portions 16 in the circumferential direction, and the shoulder 12 is formed by alternately connecting the triangular surface portions 21, 22 and the inverted triangular surface portion 23 in the circumferential direction. Since the cross-sectional shapes of the body 13 and the shoulder 12 are angular, the internal volume can be kept smaller than that of a circle circumscribed around this angular shape.

[0026] Because the number of triangular surface portions 21, 22 and inverted triangular surface portions 23 that make up the shoulder portion 12 is greater than the number of panel surface portions 15 and corner surface portions 16 that make up the body portion 13, it is possible to provide the shoulder portion 12 with many circumferentially adjacent corner portions, making the cross-sectional shape closer to a circular shape and making it easier to ensure the radial distance between the outer peripheral surface of the shoulder portion 12 and the bottle axis O. This prevents the resin material from contacting the inner surface of the cavity that molds the shoulder portion 12 at an early stage when blow molding the preform, allowing it to be sufficiently stretched, improving the moldability of the slender bottle 1.

[0027] Since the number of triangular surface portions 21, 22 and inverted triangular surface portions 23 that make up the shoulder portion 12 is greater than the number of panel surface portions 15 and corner surface portions 16 that make up the body portion 13, it is possible to increase the number of corner portions and make it easier to diffusely reflect illuminated light, thereby improving the design, compared to the conventional configuration in which the body portion 13 and shoulder portion 12, panel surface portions 15 and corner surface portions 16 are arranged alternately in the circumferential direction.

[0028] Since the distance B in the direction of the bottle axis O between the underside of the neck ring 11b and the lower edge of the shoulder portion 12 is 40% or more and 60% or less of the distance C in the direction of the bottle axis O between the underside of the neck ring 11b and the ground contact portion 14a of the bottom 14, it is possible to increase the proportion of the internal volume of the shoulder portion 12 to the internal volume of the entire bottle 1 while maintaining good moldability, and the internal volume of the bottle 1 can be reliably kept small.

[0029] The upper part of the inverted triangular surface 23 located on the shoulder 12 is divided into a first small face 24 and a pair of second small faces 25, so that the upper part 12a of the shoulder 12, which has a smaller outer diameter and where the resin material is likely to come into contact with the inner surface of the cavity at an early stage when the preform is blow molded, has more circumferentially adjacent corners than the lower part 12b of the shoulder 12, making it possible to make the cross-sectional shape closer to a circular shape. This makes it easier to ensure the radial distance between the outer peripheral surface of the upper part 12a of the shoulder 12 and the bottle axis O, and by preventing the resin material from coming into contact with the inner surface of the cavity where the shoulder 12 is molded at an early stage when the preform is blow molded, the resin material is sufficiently stretched, thereby reliably improving moldability.

[0030] Since the content volume (ml) of bottle 1 is 1.35 to 1.85 times the overall height A (mm) of bottle 1, a slender bottle 1 is obtained, which improves the moldability of the slender bottle 1, and the above-mentioned effect is effectively achieved.

[0031] The present invention is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the invention.

[0032] The upper portion of the inverted triangular surface portion 23 does not have to be divided into the first small surface portion 24 and the pair of second small surface portions 25. The inclination angle of the shoulder portion 12 relative to the container axis O may be the same over the entire length in the container axis O direction. When viewed from the outside in the radial direction, the base of the first triangular surface portion 21 may be shifted circumferentially relative to the upper edge of the panel surface portion 15, and when viewed from the outside in the radial direction, the base of the second triangular surface portion 22 may be shifted circumferentially relative to the upper edge of the corner surface portion 16. The circumferential sizes of the first triangular surface portion 21 and the second triangular surface portion 22 may be the same.

[0033] The synthetic resin material forming the bottle 1 may be, for example, polyester such as polyethylene terephthalate or polyethylene naphthalate, or polyolefin such as polyethylene or polypropylene, or ethylene vinyl alcohol copolymer (EVOH). Of these, examples of polyethylene include low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE).

[0034] In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and variations may be combined as appropriate, as long as this does not deviate from the spirit of the present invention. [Explanation of symbols]

[0035] 1 bottle 11 Mouth 11b Neck ring 12 Shoulder 13 Torso 14 Bottom 14a Grounding part 15 Panel surface 16 Corner surface 21, 22 Triangular surface part 23 Inverted triangular surface part 24 1st facet 25 2nd facet O Bottle stem

Claims

1. The mouth, shoulder, body, and bottom are arranged in this order from top to bottom along the bottle axial direction, The body portion is configured such that panel surface portions and corner surface portions are alternately arranged in a circumferential direction around the bottle axis, The shoulder portion is a triangular surface portion having an upwardly pointing triangular shape with one corner pointing upward when viewed from the outside in the radial direction; and an inverted triangular surface portion having a downwardly facing inverted triangular shape with one corner pointed downward when viewed from the outside in the radial direction, and the number of the triangular surface portions and the inverted triangular surface portions constituting the shoulder portion is greater than the number of the panel surface portions and the corner surface portions constituting the body portion, The upper part of the inverted triangular surface is a first small facet portion having an upwardly pointing triangular shape with one corner pointing upward when viewed from the outside in the radial direction; a pair of second small surface portions, each of which has a downwardly facing inverted triangular shape with one corner pointed downward when viewed from the outside in the radial direction, and which sandwich the first small surface portion in the circumferential direction; The number of adjacent corners in the circumferential direction at the upper part of the shoulder is greater than the number of adjacent corners in the circumferential direction at the lower part of the shoulder.

2. A neck ring is formed at the mouth portion so as to protrude radially outward, 2. The bottle according to claim 1, wherein the distance in the axial direction of the bottle between the lower surface of the neck ring and the lower edge of the shoulder portion is 40% or more and 60% or less of the distance in the axial direction of the bottle between the lower surface of the neck ring and the ground contact portion of the bottom.

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