JP4873912B2 - Plastic bottle - Google Patents

Description

  The present invention relates to a plastic bottle filled with a liquid.

  Plastic bottles typified by PET bottles are widely marketed in a state filled with beverages. The beverage is filled at a relatively high temperature (hot pack filling) or normal temperature (aseptic filling), but when the bottle is sealed and cooled after filling, the inside of the bottle is decompressed. When the bottle wall is deformed unevenly due to this decompression, the commercial value is lowered.

  Therefore, conventionally, many plastic bottles have been proposed in which a reduced pressure absorption panel is provided in the bottle body to suppress deformation due to reduced pressure (see, for example, Patent Documents 1 and 2).

The bottle described in Patent Document 1 has a reduced-pressure absorption panel having a square shape in plan view formed on a bottle body portion having a rectangular cross section. The bottle described in Patent Document 2 is obtained by forming a vacuum absorption panel having an oval shape in a plan view on a bottle body having a circular cross section.
All of the bottle body portions are formed in the overall size in the central axis direction. Also, each bottle body has a lateral rib formed in the circumferential direction, and the lateral rib increases the strength against the external pressure in the lateral direction (in other words, lateral rigidity). Furthermore, all the bottle trunks are connected to the conical bottle shoulder.
JP 2005-178904 A JP 2002-330222 A

  Such conventional plastic bottles, regardless of whether they are square bottles or round bottles, have a bottle body that has a substantially uniform size or diameter, but considering the ease of carrying and drinking by the user, the bottle body It is desirable that it is easy to hold. Moreover, although the horizontal rib is formed in the bottle trunk | drum, it is desirable to also improve the horizontal rigidity of a bottle shoulder part. Furthermore, it is desirable to improve the shape of the lateral ribs and the vacuum absorbing panel.

The first object of the present invention is to provide a plastic bottle that is easy to hold.
The second object of the present invention is to provide a plastic bottle that can increase rigidity without problems during production and distribution.
The third object of the present invention is to provide a plastic bottle capable of enhancing the reduced pressure absorption effect.

  In order to achieve the first object, a first plastic bottle of the present invention includes a bottle mouth part to which a cap can be attached and detached, a bottle shoulder part connected to the bottle mouth part, and a bottle body part connected to the bottle shoulder part. The bottle body is a constricted portion having a portion of the bottle body having the shortest distance from the central axis to the outer wall, and having a predetermined cross-sectional shape. And an upper body portion formed so as to expand gradually or stepwise from the constricted portion toward the upper side of the central axis, and expand gradually or stepwise from the constricted portion toward the lower side of the central axis. A lower trunk portion formed as described above. The ratio L2 / L1 was set to 71% or more and 90% or less, where L1 is the maximum distance from the central axis of the bottle body to the outer wall and L2 is a certain distance from the central axis of the constricted part to the outer wall. Is.

  Moreover, if the relationship between L1 and L2 is not expressed as a ratio but a dimension is displayed, for example, L1 may be set to 30 mm to 35 mm and L2 may be set to 25 mm to 27 mm.

  According to such a structure, an upper trunk | drum and a lower trunk | drum are provided in a bottle trunk | drum up and down on both sides of a constriction part. Since the relationship between L2 in the constricted part and L1 in the bottle body part is set as described above, the bottle body part can be easily held around the constricted part. In particular, when L2 / L1 is less than 71%, the bottle capacity is reduced and the moldability of the bottle tends to be hindered. On the other hand, when L2 / L1 exceeds 90%, the function of ease of holding as a constricted portion tends to be reduced.

  According to one aspect of the present invention, the constricted portion is preferably located within 20 mm from the center of gravity of the plastic bottle.

  As described above, the constricted portion is set in consideration of the center of gravity, that is, the position for gripping the bottle is set, so that the convenience of the user such as ease of holding can be further enhanced.

  According to one aspect of the present invention, it is preferable that the constricted portion has a predetermined cross-sectional shape made of a polyhedron.

  According to this structure, since the position which grips a bottle becomes a polyhedron substantially, when opening and closing a cap with a screw type, for example, it becomes difficult to slip (suppressing the idling of a bottle), and a user's convenience is improved. Can increase.

  According to one aspect of the present invention, the polyhedron is preferably an even polyhedron, and is preferably a substantially hexahedron.

  In this case, it is preferable that at least one of chamfering and R-chamfering is performed at the corners of the substantially hexahedron.

  According to this configuration, the constricted portion can be gripped by the user without feeling uncomfortable.

  According to one aspect of the present invention, it is preferable that a concave rib is formed in the constricted portion of the polyhedron. In particular, the rib is preferably formed over the circumferential direction of the constricted portion.

  According to this configuration, the lateral rigidity of the constricted portion can be increased. The ribs may be formed in a distributed manner in the circumferential direction.

  In this case, the rib has a rib bottom surface, an upper rib peripheral surface continuous with the upper edge of the rib bottom surface, and a lower rib peripheral surface continuous with the lower edge of the rib bottom surface. It is preferable that the outer shape of the peripheral surface or the lower rib peripheral surface is dissimilar.

  According to this configuration, the outer shape of the rib bottom surface is not similar to the outer shape of the upper rib peripheral surface or the lower rib peripheral surface, and is not an offset shape. Thereby, the improvement in strength and lateral rigidity by the rib can be further enhanced.

  According to one aspect of the present invention, it is preferable that the bottle body is formed in a substantially drum shape as a whole when viewed from the front.

  According to this structure, the constriction part located between an upper side trunk | drum and a lower side trunk | drum comes to be located in the upper-lower intermediate part of a bottle trunk | drum.

  According to one aspect of the present invention, the portion where L1 is set may be a circumferential portion that constitutes the maximum diameter of the bottle body portion.

  According to this configuration, L1 is the maximum body diameter.

  According to one aspect of the present invention, the portion where L1 is set may be provided at the upper end portion of the upper body portion and the lower end portion of the lower body portion.

  According to this configuration, for example, since the portion having the maximum body diameter is located above and below the bottle, the bottle can be stably placed horizontally. In addition, it can be stably conveyed in the production line and can be easily sold in vending machines.

  According to one aspect of the present invention, it is preferable that the upper body portion and the lower body portion are formed of a polyhedron.

  According to this configuration, the portion connected to the constricted portion is a polyhedron, so that gripping with the constricted portion as the center is easy.

  According to an aspect of the present invention, the bottle bottom portion that continues to the lower side of the bottle body portion is further provided, and the outer wall of the bottle bottom portion is squeezed gradually or stepwise toward the lower side of the central axis to the same extent as the constricted portion. It is preferable that it is formed so that it may be formed.

  According to this configuration, the design of the bottle can be improved in design, the bottom can be thickened, the barrier property can be improved, and the storage performance as a container can be improved.

  Hereinafter, a plastic bottle according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following, first, the general components of the plastic bottle will be briefly described, and then each component will be described in detail. Here, a description will be given by taking, as an example, a plastic bottle for 500 ml that is widely marketed.

1 to 3 are a front view, a side view, and a bottom view of a plastic bottle.
The plastic bottle 1 (hereinafter simply referred to as “bottle 1”) is made of various thermoplastic resins such as polyethylene, polypropylene, and polyethylene terephthalate, such as blow molding, injection blow molding, and stretch blow molding (biaxial stretch blow molding). Molded and manufactured by a molding method. The manufactured hollow bottle 1 is subjected to cleaning / sterilizing treatment with hot water sterilization, a chlorine-based sterilizing agent, and the like, and then filled with a liquid as a content.

  The liquid filled in the bottle 1 is, for example, a beverage, and examples of the beverage include various non-carbonated beverages such as tea (green tea), oolong tea, black tea, coffee, and fruit juice. The non-carbonated beverage is filled in the bottle 1 by a known aseptic filling device, for example, in hot pack filling (relatively high temperature: for example, 80 ° C.) or aseptic filling (normal temperature: for example, 15 to 35 ° C.). A cap (not shown) for closing the drinking mouth is fixed to the bottle 1 so that it can be opened.

  In addition, the liquid with which the bottle 1 is filled is not limited to beverages, but may be foods such as sauces and mirin, or may be carbonated beverages. However, as will be described later, the bottle 1 of the present embodiment is suitable for filling a non-carbonated beverage, and is easy to hold and has various devices such as improving the reduced pressure absorption effect and lateral rigidity. ing. The lateral rigidity mainly refers to the strength against the external pressure in the lateral direction (radial direction) of the bottle 1.

  The bottle 1 is integrally formed so as to connect the mouth portion 2, the shoulder portion 3, the trunk portion 4, and the bottom portion 5 in order from the upper side of the central axis Y-Y (vertical axis), and can thereby store a beverage therein. A bottle wall 6 is formed. A panel region of the body portion 4 is set at a portion sandwiched between the pair of upper and lower concave rings 7 and 8. That is, the upper ring 7 borders between the trunk 4 and the shoulder 3, and the lower ring 8 borders between the trunk 4 and the bottom 5. In addition, the bottle wall 6 is provided with three types of triangular vacuum absorbing panels 10, 11, 12 in total.

  The mouth portion 2 is located at the upper end portion of the bottle 1 and constitutes the minimum diameter portion of the bottle 1. The mouth part 2 has an open upper end and functions as a beverage supply port or a drinking port. The mouth portion 2 is formed with a vent slot (screw portion) 21 configured to be detachable with a cap (not shown), and a flange portion 22 is formed on the lower side thereof. The cap is rotated by the consumer about the central axis Y-Y so as to move between the open position and the closed position.

  The bottom 5 is located at the bottom of the bottle 1. The bottom part 5 is formed in a circular cross section as a whole, and the outer wall having a circular cross section is formed so as to be gradually or stepwise reduced toward the lower side of the central axis Y-Y. That is, the outer wall of the circular cross section is formed so that the outer diameter gradually decreases from the upper side to the lower side. In addition, six triangular decompression absorption panels 12 are provided at equal intervals in the circumferential direction on the outer wall having a circular cross section. On the other hand, the bottom surface of the bottom portion 5 is recessed upward in order to give the bottle 1 strength.

  The body part 4 is formed in a substantially drum shape as a whole when viewed from the front (particularly, refer to FIG. 1), and its upper and lower intermediate parts are narrowed compared to other parts. That is, the body portion 4 includes a constricted portion 31 positioned at the upper and lower intermediate portions, an upper body portion 32 formed so as to gradually expand from the constricted portion 31 toward the upper portion of the central axis YY, and the constricted portion. 31 and a lower body 33 formed so as to gradually expand downward from the center axis Y-Y. By setting it as such a structure, the outer wall of the trunk | drum 4 becomes easy to hold | grip.

  From the viewpoint of further improving ease of holding, the constricted portion 31 is set such that the distance from the center of gravity G of the bottle 1 is within 20 mm in the central axis direction (YY direction). In addition, the constriction part 31 can be paraphrased as a waist part or a narrowing part from the feature on the shape.

  In an opposite view, the upper body portion 32 and the lower body portion 33 are gradually narrowed toward the constricted portion 31, so that the distance from the central axis YY to the outer wall is gradually increased as the distance from the constricted portion 31 increases. It is formed to be long. In addition, you may form so that the upper side trunk | drum 32 may be expanded in steps toward upper direction, and you may form so that the lower side trunk | drum 33 may be expanded in steps toward downward.

  The trunk | drum 4 is comprised by the polyhedron cross section as a whole. Preferably, the constricted portion 31, the upper body portion 32, and the lower body portion 33 are configured by a polyhedral cross section having an even number of surfaces, and are configured by a substantially preferred hexahedral cross section in the present embodiment. Here, the reason why the hexahedron is given “substantially” is that the body part 4 is basically a hexahedron cross section (cross section of regular hexagon), but each corner of the regular hexagon is chamfered or rounded, so the body part 4 is precisely a cross section close to a dodecahedron.

  The constricted portion 31 has a concave rib 35 formed over the circumferential direction. In the constricted portion 31, the portion with the rib 35 is set to have a minimum distance from the central axis YY to the outer wall. By attaching the rib 35 to the constricted portion 31, the lateral rigidity of the constricted portion 31 can be improved as compared with the case where the rib 35 is not attached. Further, the rib 35 is further improved in lateral rigidity by the following device on the shape. This will be described with reference to FIG. 1, FIG. 4 and FIG.

FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. For this reason, in FIG. 4, the lower trunk | drum 33 etc. are abbreviate | omitted.
The rib 35 is formed such that the outer wall of the constricted portion 31 is depressed, and faces the inner wall protruding into the hollow interior of the bottle 1. The outer wall of the rib 35 is formed by a rib bottom surface 41, an upper rib peripheral surface 42 and a lower rib peripheral surface 43.

The upper rib circumferential surface 42 has one end connected to the upper edge of the rib bottom surface 41 and the other end connected to the lower end of the upper body portion 32. The upper rib circumferential surface 42 is inclined upward with respect to the cross section of the bottle.
The lower rib peripheral surface 43 has one end connected to the lower edge of the rib bottom surface 41 and the other end connected to the upper end of the lower body portion 33. The lower rib peripheral surface 43 is inclined downward with respect to the cross section of the bottle.
The upper rib peripheral surface 42 and the lower rib peripheral surface 43 are formed to have the same outer shape. Of course, these outer shapes may be different from each other.

  The outer shape of the rib bottom surface 41 is not similar to the outer shape of the upper rib peripheral surface 42 and the lower rib peripheral surface 43. As described above, the outer shape (contour) of the rib bottom surface 41 is based on a regular hexagon, and each corner of the regular hexagon has, for example, a R5 radius. On the other hand, the outer shape of the upper rib peripheral surface 42 and the lower rib peripheral surface 43 is basically a regular hexagon, and each corner of the regular hexagon is chamfered.

  FIG. 5 is a diagram showing the cross section of the rib 35 in a simplified manner, (a) a comparative example, and (b) a diagram showing this embodiment.

  As shown in FIG. 5A, the outer shape of the rib bottom surface 41 ′ and the upper rib circumferential surface 42 ′ (or the lower rib circumferential surface 43 ′) in the comparative example is chamfered at each corner of the basic regular hexagon, It is similar. Therefore, focusing on a certain corner, a straight line m connecting the bending point 45 ′ of the rib bottom surface 41 ′ and the bending point 47 ′ of the upper rib peripheral surface 42 ′ (or the lower rib peripheral surface 43 ′) has a central axis. Y-Y intersects. That is, the rib 35 ′ shown in FIG. 5A is configured such that the rib bottom surface 41 ′ and the upper rib peripheral surface 42 ′ (or the lower rib peripheral surface 43 ′) are offset.

  As shown in FIG. 5B, the six corners of the outer shape of the rib bottom surface 41 are bent surfaces. Focusing on a certain corner, when the portion 45 of the bent surface of the rib bottom surface 41 that is farthest from the central axis YY and the central axis YY are connected by a straight line m, the upper rib is placed on the straight line m. The two bending points 47, 47 of the peripheral surface 42 (or the lower rib peripheral surface 43) are not positioned.

  That is, a straight line m connecting the bent surface portion 45 of the rib bottom surface 41 and the central axis YY is located between the two bent points 47 of the upper rib peripheral surface 42 (or the lower rib peripheral surface 43). To come. Thus, in the rib 35 of the present embodiment, the outer shape of the rib bottom surface 41 is not offset with respect to the outer shape of the upper rib peripheral surface 42 or the lower rib peripheral surface 43. The improvement in lateral rigidity can be further increased.

The description will be given with reference to FIGS. 1 and 2 again.
The upper body portion 32 and the lower body portion 33 have a panel region in which twelve panels in a front view, substantially trapezoidal shape, or substantially flask shape are alternately reversed in the circumferential direction. And the upper side trunk | drum 32 and the lower side trunk | drum 33 arrange | position the decompression panel 10 and 11 of triangular shape every other sheet of the panel. Details of the vacuum absorbing panels 10 and 11 will be described later.

  A circular section 50 having a circular cross section having a ring 7 is provided at the upper end portion of the upper body portion 32, that is, the upper portion of the panel region. The ring 7 is formed in a concave shape in the circumferential direction and has an inverted cross-sectional shape, and faces the inner wall so as to protrude into the hollow interior of the bottle 1. The ring 7 is located at the upper and lower intermediate positions of the circumferential portion 50, and the upper and lower annular portions sandwiching the ring 7 in the circumferential portion 50 form the maximum diameter portion 51 constituting the maximum outer diameter of the bottle 1.

  A circular circumferential portion 60 having a ring 8 is provided at the lower end portion of the lower body portion 33, that is, the lower portion of the panel region. The ring 8 is formed in a concave shape in the circumferential direction and has an inverted cross section, and faces the inner wall so as to protrude into the hollow interior of the bottle 1. The ring 8 is located at an upper and lower intermediate position of the circumferential portion 60, and an upper and lower annular portion sandwiching the ring 8 in the circumferential portion 60 is a maximum diameter portion 61 constituting the maximum outer diameter of the bottle 1.

  The maximum diameter portions 51 and 61 are configured with the same diameter. When the bottle 1 is placed horizontally, the bottle 1 is stably supported by the maximum diameter portions 51 and 61 located above and below the bottle 1. The two rings 7 and 8 can be paraphrased as ring ribs and function to improve the strength and lateral rigidity of the bottle 1 in the same manner as the ribs 35 of the constricted portion 31. As described above, the two rings 7 and 8 may be annular, but the outer shape may be devised similarly to the rib 35 of the constricted portion 31. This modification will be described with reference to FIG.

FIG. 6 is a cross-sectional view showing a simplified cross section of the lower ring 8.
The outline of the ring 8 is configured by a substantially regular hexagon. Here, the reason for adding “substantially” to the regular hexagon is that each side of the regular hexagon is formed by an arc, and R4 is taken at each corner of the regular hexagon, for example. On the other hand, the contour of the maximum diameter portion 61 is circular.

  Thus, by making the contour of the ring 8 and the contour of the maximum diameter portion 61 dissimilar (non-offset shape), it is possible to further improve the strength and lateral rigidity of this portion. The upper ring 7 and the circumferential portion 50 may be configured similarly. As another modification, the contours of the rings 7 and 8 may be circular, and the contours of the maximum diameter portions 51 and 61 may be substantially polygonal.

Here, an example of the dimension related to the trunk | drum 4 is demonstrated easily.
In the body part 4, the maximum distance L1 from the central axis YY to the bottle outer wall is set to the upper and lower maximum diameter parts 51 and 61 (see FIGS. 2 and 6). On the other hand, in the constricted portion 31, a certain distance L2 from the central axis YY to the bottle outer wall is set as shown in FIG. That is, the distance L2 corresponds to one side of a substantially hexagonal shape in the boundary line between the lower rib peripheral surface 43 and the lower body portion 33 (or the boundary line between the upper rib peripheral surface 42 and the upper body portion 32). The distance between the part and the central axis Y-Y.

  For example, the maximum distance L1 is not less than 30 mm and not more than 35 mm, preferably 33.5 mm. Moreover, the distance L2 is 25 mm or more and 27 mm or less, Preferably it is 25.805 mm. When these are converted as a ratio, the ratio L2 / L1 is 71% or more and 90% or less, and preferably 77%.

  In this way, by defining the relationship between the maximum distance L1 and the distance L2, the body portion 4 can be easily held around the constricted portion 31. In particular, when L2 / L1 is less than 71%, the bottle capacity tends to be small, whereas when L2 / L1 exceeds 90%, the function of ease of holding as the constricted portion 31 tends to be reduced. is there.

Next, with reference to FIG.2 and FIG.7, the shoulder part 3 is explained in full detail.
The shoulder 3 includes a dome portion 71 that is continuous with the lower portion of the mouth portion 2, and a step portion 72 that is continuous with the lower end of the dome portion 71. The dome portion 71 is formed in a dome shape or a substantially truncated cone shape so as to expand toward the upper side of the central axis Y-Y.

  The step portion 72 includes a vertical peripheral surface 81 that is continuous with the lower end of the dome portion 71, and a spherical belt-shaped peripheral surface 82 that is continuous with the lower end of the peripheral surface 81. Both peripheral surfaces 81 and 82 are formed in the shoulder portion 3 in the circumferential direction.

  The spherical belt-shaped peripheral surface 82 is curved outward in the radial direction from the peripheral surface 81, and the lower end thereof is continuous with the maximum diameter portion 51. The maximum diameter portion 51 is substantially adjacent to each of the stepped portion 72 and the ring 7, and is set to a height (width) of less than 10 mm, for example, and preferably set to a height of 3 mm. Between the vertical circumferential surface 81 and the lower end of the dome portion 71, for example, R3 is rounded, and between the vertical circumferential surface 81 and the ball-shaped circumferential surface 82, for example, R1.5 is rounded. ing.

  Thus, by providing the shoulder portion 3 with the stepped portion 72, an effect like a ring rib can be obtained, and the lateral rigidity of the shoulder portion 3 can be increased. Further, by using the stepped portion 72 and the ring 7 together in the upper part of the bottle 1, the lateral rigidity can be further enhanced. And even if one of the stepped portion 72 and the ring 7 is deformed, the function of lateral rigidity can be covered with the other.

Next, the reduced pressure absorption panels 10, 11, and 12 will be described in detail with reference to FIGS.
As described above, the bottle wall 6 is provided with three kinds of triangular decompression absorption panels 10, 11, 12 in total, and each of the decompression absorption panels 10, 11, 12 is equally spaced in the circumferential direction by six. Is provided. The reduced pressure absorption panels 10, 11, 12 can absorb the decrease in the bottle internal pressure after filling the beverage, and the deformation of the bottle 1 can be suppressed. Moreover, lateral rigidity can be improved like a ring rib by making decompression absorption panel 10,11,12 into a triangular shape.

  The first reduced pressure absorption panel 10 is provided on the upper body 32, the second reduced pressure absorption panel 11 is provided on the lower body 33, and the third reduced pressure absorption panel 12 is provided on the bottom 5. Here, the second reduced pressure absorption panel 11 is formed larger than the other reduced pressure absorption panels 10 and 12. The number of the vacuum absorbing panels 10, 11, and 12 is six, but may be one. However, it is preferable that there are a plurality of reduced-pressure absorption panels 10, 11, and 12, respectively.

  Each of the first to third reduced pressure absorption panels 10, 11, 12 has a triangular shape in front view. The first to third reduced-pressure absorption panels 10, 11, and 12 may be arbitrary triangles or equilateral triangles when viewed from the front, but here are configured as isosceles triangles. By setting it as an isosceles triangle, even if the bottle 1 deform | transforms by decompression, the design property of the decompression absorption panels 10, 11, and 12 can be ensured appropriately.

  Each side 101, 111, 121 of each of the first to third reduced pressure absorption panels 10, 11, 12 is located in the vicinity of the circumferential portions 50, 60 along the circumferential direction. Each of these sides 101, 111, 121 is located, for example, at a portion of 2 mm or more and less than 10 mm in the direction of the central axis Y-Y from the nearest maximum diameter portions 51, 61, respectively.

Specifically, one side 101 of the first reduced pressure absorption panel 10 is located directly below the lower maximum diameter portion 51 in the upper circumferential portion 50.
One side 111 of the second reduced pressure absorption panel 11 is located immediately above the upper maximum diameter portion 61 in the lower circumferential portion 60.
One side 121 of the third reduced pressure absorption panel 12 is located directly below the lower maximum diameter portion 61 in the lower circumferential portion 60.

  The first to third decompression absorption panels 10, 11, and 12 have vertices 102, 112, and 122 that are furthest from one side 101, 111, and 121 (that is, vertices that do not contact one side) 102, 112, and 122, respectively. ing. Since the first to third reduced pressure absorption panels 10, 11, and 12 have substantially the same configuration, the first reduced pressure absorption panel 10 will be described in detail here as an example.

FIG. 8 is an enlarged view showing the first reduced pressure absorption panel 10.
The vacuum absorbing panel 10 is formed so as to be dropped into the bottle wall 6 in a concave shape, but the panel depth is not constant.

  Specifically, the reduced pressure absorption panel 10 has the panel depth at one side 101 along the circumferential direction being the deepest and the panel depth at the vertex 102 farthest from the one side 101 is eliminated from the one side 101 to the vertex 102. The panel depth is gradually reduced. The panel depth of the vertex 102 is zero.

  That is, the vertex 102 is arranged on the same plane as the other outer surface of the bottle wall 6. By carrying out like this, the pressure reduction effect of the pressure reduction absorption panel 10 can be improved further. But as a mode of a modification, you may make it drop the whole decompression absorption panel 10 into a concave shape.

  In the reduced pressure absorption panel 10, the two vertices 104 and 105 in contact with the one side 101 each have a radius R, preferably a radius R of 5 or less. By carrying out like this, the bending in the two vertexes 104 and 105 of the decompression absorption panel 10 can be suppressed suitably.

  The three side surfaces 106, 107, and 108 that define the panel depth of the vacuum absorbing panel 10 are inclined toward the inside of the triangular panel surface (bottom surface) 109. By doing so, the moldability of the reduced pressure absorption panel 10 is enhanced, and it is possible to suppress the chemical solution from being accumulated in the portion of the reduced pressure absorption panel during the cleaning of the chemical solution after manufacture.

  In the above description, the decompression absorption panels 10, 11, and 12 have been described as having an isosceles triangular outline, but this shape can also be referred to as a teardrop shape or a waterdrop shape. Further, the reduced pressure absorption panels 10, 11, and 12 are not limited to triangles, but may be any polygonal shape with an odd number of angles, and may be pentagons or heptagons, for example. In any case, the decompression absorption panels 10, 11, and 12 have one side along the circumferential direction, and a straight line drawn from the vertex farthest from the one side to the one side is a perpendicular bisection of the one side. It only has to be a line.

  According to the bottle 1 of the present embodiment described above, the neck portion 31 is provided with the constricted portion 31, and the relationship between the distance L2 and the maximum distance L1 at that portion is set to a predetermined value. be able to. Further, since the constricted portion 31 has a polyhedral cross section, it is possible to improve user convenience, such as being less slippery when the cap is opened and closed.

  Further, since the rib 35 is provided in the constricted portion 31 and the cross-sectional shape of the rib 35 is devised, the lateral rigidity of this portion can be increased. Further, the lateral rigidity of the bottle 1 can be increased by the two rings 7 and 8 and the stepped portion 72 of the shoulder portion 3, and furthermore, the triangular vacuum decompression panels 10, 11, and 12 can also improve the bottle 1. Lateral rigidity can be increased. In addition, since the above-described characteristic shapes of the reduced pressure absorption panels 10, 11, and 12 are formed, the reduced pressure absorption effect can be enhanced, and the deformation of the bottle 1 accompanying the reduced pressure can be appropriately suppressed. Furthermore, the above-described structure of the bottle wall 6 can improve the aesthetics of the bottle 1 and can promote the properness of the line at the time of manufacture and the properness of sale in the vending machine.

It is a front view of the plastic bottle which concerns on embodiment. It is a side view of the plastic bottle which concerns on embodiment. It is a bottom view of the plastic bottle which concerns on embodiment. It is sectional drawing cut | disconnected by the IV-IV line of FIG. It is explanatory drawing explaining the lateral rigidity of the constriction part of the plastic bottle which concerns on embodiment, (a) It is a figure which concerns on a comparative example, (b) It is a figure which concerns on embodiment which shows FIG. 4 simply. It is sectional drawing cut | disconnected by the VI-VI line of FIG. It is a figure which expands and shows the shoulder part of the plastic bottle which concerns on embodiment. It is a figure which expands and shows the decompression absorption panel of the plastic bottle which concerns on embodiment.

  1: bottle, 2: mouth, 3: shoulder, 4: body, 5: bottom, 6: bottle wall, 7: ring, 8: ring, 10-12: vacuum absorbing panel, 31: constriction, 32 : Upper body part, 33: Lower body part, 35: Rib, 41: Rib bottom surface, 42: Upper rib peripheral surface, 43: Lower rib peripheral surface, 47: Bending point, 50: Circumferential part, 51: Maximum Diameter part, 60: Circumferential part, 61: Maximum diameter part, 72: Step part, 81: Vertical peripheral surface, 82: Spherical surface in a spherical zone, 101: One side, 102: Vertex, 111: One side, 112: Vertex 121: One side, 122: Vertex, YY: Central axis, G: Center of gravity

Claims (8)

A plastic bottle comprising a bottle mouth, a bottle shoulder connected to the bottle mouth, and a bottle body connected to the bottle shoulder,
The bottle body is
Of the bottle body portion, the constricted portion having the shortest distance from the central axis to the outer wall, the constricted portion having a substantially hexagonal cross-sectional shape,
An upper trunk portion formed so as to expand gradually or stepwise from the constricted portion toward the upper side of the central axis;
A lower torso formed so as to expand gradually or stepwise from the constriction toward the lower side of the central axis,
When the maximum distance from the central axis to the outer wall in the bottle body portion is L1, and the distance from the central axis to the portion corresponding to one side of the substantially hexagonal shape is L2 in the constricted portion,
The ratio L2 / L1 is set to 71% or more and 90% or less,
The portion where L1 is set is a circumferential portion constituting the maximum diameter of the bottle body, and is formed at the upper end of the upper body and the lower end of the lower body ,
A plastic bottle in which a concave rib is formed in the constricted portion . A plastic bottle comprising a bottle mouth, a bottle shoulder connected to the bottle mouth, and a bottle body connected to the bottle shoulder,
The bottle body is
Of the bottle body portion, the constricted portion having the shortest distance from the central axis to the outer wall, the constricted portion having a substantially hexagonal cross-sectional shape,
An upper trunk portion formed so as to expand gradually or stepwise from the constricted portion toward the upper side of the central axis;
A lower torso formed so as to expand gradually or stepwise from the constriction toward the lower side of the central axis,
When the maximum distance from the central axis to the outer wall in the bottle body portion is L1, and the distance from the central axis to the portion corresponding to one side of the substantially hexagonal shape is L2 in the constricted portion,
L1 is set to 30 mm or more and 35 mm or less, and L2 is set to 25 mm or more and 27 mm or less,
The portion where L1 is set is a circumferential portion constituting the maximum diameter of the bottle body, and is formed at the upper end of the upper body and the lower end of the lower body ,
A plastic bottle in which a concave rib is formed in the constricted portion .   The plastic bottle according to claim 1 or 2, wherein the constricted portion is located within 20 mm from the center of gravity of the plastic bottle.   The plastic bottle according to any one of claims 1 to 3, wherein each corner of the substantially hexagonal shape is chamfered and / or rounded. The plastic bottle according to any one of claims 1 to 4, wherein the rib is formed along a circumferential direction of the constricted portion. The rib has a rib bottom surface, an upper rib peripheral surface continuous with an upper edge of the rib bottom surface, and a lower rib peripheral surface continuous with a lower edge of the rib bottom surface,
The plastic bottle according to claim 5 , wherein an outer shape of the rib bottom surface is not similar to an outer shape of the upper rib peripheral surface or the lower rib peripheral surface. The plastic bottle according to any one of claims 1 to 6 , wherein the upper body part and the lower body part are formed of a polyhedron. Further comprising a bottle bottom continuous to the lower side of the bottle body,
Outer wall of the bottle bottom, to the same extent as the constricted portion, as claimed in any one of the claims 1 are formed so as to be narrowed toward below the central axis gradually or stepwise 7 Plastic bottle.

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