WO2019171799A1

WO2019171799A1 - Plastic bottle

Info

Publication number: WO2019171799A1
Application number: PCT/JP2019/001892
Authority: WO
Inventors: 吉良剛; 小林俊也; 松竹直斗; バゲットアリーシャ
Original assignee: サントリーホールディングス株式会社
Priority date: 2018-03-05
Filing date: 2019-01-22
Publication date: 2019-09-12
Also published as: JP2019151389A; CN111886183A; EP3763627A4; EP3763627B1; EP3763627A1; ES2948262T3; JP7296697B2

Abstract

Provided is a plastic bottle having a reduced pressure absorbing panel section 33 and a trunk part reference surface 34 in a trunk part. This plastic bottle is characterized in that the reduced pressure absorbing panel section 33 extends in the up-down direction of the trunk part and is shaped so as to be twisted about the center axis of the bottle in the circumferential direction, that a first recessed section 33a is depressed from the trunk part reference surface 34 toward the inside of the bottle, that a second recessed section 33b is provided to the circumferential center of the first recessed section 33a so as to be further depressed from the first recessed section 33a, that protruding sections 33c are formed at both end portions in the up-down direction of the first recessed section 33a and each have a curved surface protruding outward from the first recessed section 33a, and that the width in the up-down direction of each of the protruding sections 33c is smallest at both end portions in the circumferential direction and largest in the center portion.

Description

Plastic bottle

The present invention relates to a plastic bottle having at least one reduced pressure absorption panel portion on the body portion and a body reference surface formed around the reduced pressure absorption panel portion.

In the manufacturing process of beverages filled in plastic bottles, so-called high-temperature filling in which a beverage in a heated state is filled may be performed. In such a case, after the beverage is filled at a high temperature, the mouth portion is closed with a cap or the like, and the internal pressure is lowered as the beverage is cooled, which may cause a problem that the plastic bottle is depressed. In order to prevent such problems, it is common to provide a vacuum absorbing panel on the body of a plastic bottle.

For example, Patent Document 1 discloses a plastic bottle including a reduced pressure absorption wall formed by an inclined panel having an inclination with respect to the axis of the plastic bottle, and column walls alternately arranged with the reduced pressure absorption wall. Has been. The plastic bottle has been successfully imparted with a vacuum absorbing function and at the same time imparted formability in blow molding and resistance to external impact force.

Japanese Unexamined Patent Publication No. 2013-95428

By the way, the decompression absorption part provided in the plastic bottle like patent document 1 is easy to raise | generate the dent (what is called sink) by shrinkage | contraction at the time of bottle shaping | molding. There was a problem in strength in that it was easily deformed. For this reason, there are cases where production conditions in the plastic bottle molding and beverage filling processes are restricted so that such deformation defects do not occur. Such restrictions may be a factor that impairs productivity in the production of plastic bottles and beverages.

Therefore, realization of a plastic bottle having a reduced pressure absorption function and at the same time high strength is desired.

The plastic bottle according to the present invention is a plastic bottle provided with a reduced pressure absorption panel portion on the body portion, and a body reference surface formed around the reduced pressure absorption panel portion. It extends in the vertical direction of the body portion, and is provided in a shape twisted in the circumferential direction around the central axis of the plastic bottle, the reduced pressure absorption panel portion, the first recess, the second recess, And the first recess is recessed from the trunk reference surface toward the inside of the plastic bottle, and the second recess is in the center in the circumferential direction of the first recess. The first concave portion is provided so as to be further depressed toward the inside of the plastic bottle, and the convex portions are formed at both ends in the vertical direction of the first concave portion over the entire circumferential width of the first concave portion. From the recess A curved surface that is convex toward the outside of the stick bottle is formed, and the vertical width of the convex portion is the smallest at both ends in the circumferential direction of the convex portion, and the circumferential direction of the convex portion is It is the largest in the central part.

According to this configuration, the first concave portion and the second concave portion work together to exhibit a good vacuum absorption function, and the vacuum panel portion is provided with a twisted shape, thereby realizing high strength in the vertical direction. can do. In addition, when the reduced pressure absorption panel portion has a convex portion, the deformation of the first concave portion and the second concave portion can be suppressed, and it is difficult to cause sink marks at the time of molding. Can also be made difficult to deform.

Hereinafter, preferred embodiments of the present invention will be described. However, the scope of the present invention is not limited by the preferred embodiments described below.

The plastic bottle according to the present invention, as one aspect, forms a ridge in a portion where two trunk reference surfaces extending from two adjacent vacuum absorption panel parts meet, The distance from the central axis is preferably the maximum at the peak portion.

According to this configuration, a higher strength can be realized in the vertical direction by providing the ridged portion with the decompression panel portion so as to be twisted.

In the plastic bottle according to the present invention, as one aspect, the first recess is preferably flat.

According to this configuration, the reduced pressure absorption action by the first recess can be further enhanced.

Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments described with reference to the drawings.

The front view of a plastic bottle. Front sectional drawing of a plastic bottle. III-III sectional view in FIG. IV-IV sectional drawing in FIG. The front enlarged view of the trunk | drum of a plastic bottle. VI-VI sectional drawing in FIG. VII-VII sectional view in FIG. The bottom view of the bottom part of a plastic bottle. The enlarged view of the recessed part bottom part provided in the bottom part of the plastic bottle.

Embodiments of a plastic bottle according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the plastic bottle 100 according to the present embodiment includes a mouth portion 1 as a liquid spout, a shoulder portion 2 that is continuous with the mouth portion 1 and gradually increases in diameter toward the bottom surface, and a shoulder. The cylindrical body part 3 is continuous with the part 2, and the bottom part 4 is the bottom of the plastic bottle 100. In the following description, the “depth” of each structure provided on the surface of the plastic bottle 100 is defined as a depth that penetrates from the surface of the plastic bottle 100 to the inside.

In addition, the plastic bottle 100 according to the present embodiment can be integrally molded by a stretch molding method such as biaxial stretch blow molding using a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate as a main material. The capacity of the plastic bottle 100 is not particularly limited, and can be about 200 mL to 2 L, such as 280 mL, 350 mL, and 500 mL that are generally distributed. Moreover, the liquid with which the plastic bottle 100 is filled is not particularly limited. For example, beverages such as drinking water, tea, fruit juice, coffee, cocoa, soft drinks, alcoholic beverages, milk beverages, soups, and liquids such as sauces and soy sauces. Seasonings and the like.

[Rib structure]
A concave main circumferential rib 31 is provided in the upper region 3 a of the body portion 3. In addition, concave sub-circular ribs 32 are provided in the upper region 3 a and the lower region 3 c of the trunk portion 3. As shown in FIG. 2, the main peripheral rib 31 is formed so that the depth and the width in the vertical direction are larger than the sub peripheral rib 32.

As shown in FIG. 3, the main circumferential rib 31 has a wavy horizontal cross-sectional shape whose depth continuously changes along the circumferential direction of the plastic bottle 100, and the depth has a maximum value of 4.5 mm. The minimum value is 3.5 mm. The main circumferential rib 31 has seven points 31a at which the depth takes the maximum value and seven points 31b at which the depth takes the minimum value. This is a wave-like shape in which the points 31a taking the maximum value and the points 31b taking the minimum value are alternately and smoothly connected. That is, the horizontal cross-sectional shape is convex toward the outside of the plastic bottle around the point 31a where the depth takes the maximum value, and toward the inside of the plastic bottle around the point 31b where the depth takes the minimum value. It is a closed curve that is convex and has an inflection point between a point 31a having a maximum depth and a point 31b having a minimum depth.

The vertical width of the main circumferential rib 31 is 8.0 mm at a point 31a where the depth takes a maximum value, and 7.2 mm at a point 31b where the depth takes a minimum value.

As shown in FIGS. 1 and 2, a plurality of sub-circular ribs 32 may be provided. In this embodiment, three sub-circular ribs 32 are provided in the upper region 3a and two in the lower region 3c. In the present embodiment, the secondary circumferential rib 32 has a circular horizontal cross-sectional shape, a depth of 1.5 mm, and a vertical width of 4.9 mm.

When a horizontal load is applied to the plastic bottle 100, the horizontal cross-sectional shape of the plastic bottle 100 may be deformed into an ellipse. However, the plastic bottle 100 according to the present embodiment realizes a structure in which the load is less likely to be concentrated due to the main circumferential rib 31 having a wavy horizontal cross-sectional shape, so that the plastic bottle 100 is not easily deformed.

Also, when a vertical load is applied to the plastic bottle 100, the plastic bottle can be deformed in the vertical direction. However, the plastic bottle 100 according to the present embodiment includes the main peripheral rib 31 and the sub peripheral rib 32 having different depths and widths, so that these ribs work together in a spring shape, and load in the vertical direction. Since the mitigating action is expressed, the plastic bottle 100 is hardly deformed.

[Panel structure]
A plurality of (six in this embodiment) panels 33 (six in the present embodiment) are formed in the middle region 3b of the body portion 3 along the circumferential direction of the middle region 3b. ing. As shown in FIG. 5, the panel 33 has a shape extending in the vertical direction of the middle region 3 b and is twisted in the circumferential direction around the central axis of the plastic bottle 100. In addition, a trunk reference surface 34 is formed around the panel 33.

As shown in FIGS. 5 to 7, the panel 33 includes a panel first recess 33a (an example of the first recess), a panel second recess 33b (an example of the second recess), and a panel protrusion 33c (an example of the protrusion). ). The panel first concave portion 33 a has a planar shape and is provided so as to be recessed from the trunk reference surface 34 toward the inside of the plastic bottle 100. The panel 2nd recessed part 33b is provided in the center of the circumferential direction of the panel 1st recessed part 33a so that it may sink further toward the inner side of the plastic bottle 100 from the panel 1st recessed part 33a.

The panel convex portion 33c is a curved surface in which both ends in the vertical direction of the panel first concave portion 33a are convex from the panel first concave portion 33a toward the outside of the plastic bottle 100 over the entire circumferential width of the panel first concave portion 33a. It is formed as. The vertical width of the panel convex portion 33c is the smallest at both ends in the circumferential direction of the panel convex portion 33c, and is the largest at the central portion in the circumferential direction of the panel convex portion 33c.

A ridge 34a is formed at a portion where two trunk reference surfaces 34 extending from the two panel first recesses 33a meet. The distance from the central axis of the plastic bottle 100 to the trunk reference surface 34 is maximum at the ridge portion 34a.

The plastic bottle 100 according to this embodiment realizes reinforcement of the panel 33 by having the panel convex portion 33c. Therefore, problems due to deformation such as deformation to the outside in the radial direction that occurs when pressurizing to fill a bottle with a beverage, and depressions (so-called sink marks) that occur due to shrinkage when the bottle is molded are less likely to occur.

[Bottom structure]
As shown in FIGS. 5, 8, and 9, the bottom portion 4 includes a grounding portion 41 that is grounded to an installation surface such as a desk, and an inner side of the plastic bottle 100 (in FIG. And a dome portion 42 that protrudes upward). A dome center portion 421 that protrudes further into the plastic bottle 100 than the dome portion 42 is provided at the center portion of the dome portion 42, and a plurality of bottom recesses 422 are provided around the dome center portion 421.

As shown in FIG. 9, the bottom recess 422 has a concave hexagonal shape (so-called bow tie) having four convex vertices 422a having an inner angle of 70 ° and two concave vertices 422b having an inner angle of 220 ° in plan view. Shape). Here, the two vertices adjacent to the convex vertex 422a are the convex vertex 422a and the concave vertex 422b, and the two vertices adjacent to the concave vertex 422b are the two convex vertices 422a. Each side of the concave hexagon is 3 mm, and the length of the diagonal line having the maximum length among the diagonal lines of the concave hexagon is 6 mm. The depth of the bottom recess 422 is 1.2 mm.

As shown in FIGS. 8 and 9, the bottom recess 422 forms a bottom recess row 423 in which a plurality of bottom recesses 422 are arranged in a row. At the bottom concave portion rows 423, a plurality of bottom recesses 422 along an extension of the center line C _L connecting the center point to each other of the two sides to be sandwiched between two convex vertices 422a central axis C _A, the center axis C _A Are arranged adjacent to each other so as to match.

8 and 9, a plurality of bottom recesses columns 423, respective central axes C _A are arranged side by side in parallel with each other. Also, two of the bottom concave portion rows 423a adjacent to each other, 423b is the central axis _{C A} are arranged offset from one another along the length of the width of the offset center line _{C L} of (5.2 mm) half Is 2.6 mm. Here, the term “offset” refers to the two concave portions of the bottom concave portion 422 belonging to the other bottom concave portion row 423b adjacent to each other. so as not to coincide with the straight line connecting the to what vertices 422b, indicates that the staggered along a plurality of bottom recesses columns 423 to the central axis C _a, the term "width of the offset" is the distance of the straight line with each other Represent.

Further, the three bottom concave portions 422 adjacent to each other are arranged in a manner in which two convex vertices 422a and one concave vertex 422b are brought close to each other. In other words, the adjacent convex vertices 422a of the two adjacent bottom concave portions 422 belonging to the bottom concave portion row 423a are arranged on the outside in a plan view of the concave vertex 422b of the bottom concave portion 422 belonging to the bottom concave portion row 423b. It arrange | positions so that it may insert in vision (A part of FIG. 9). Such a fitting structure is formed in all places where the three bottom recesses 422 are adjacent.

When a conventional plastic bottle is pressurized to fill a bottle with a beverage, the bottle may be deformed in such a manner that its bottom is pushed downward by internal pressure. The plastic bottle 100 according to the present embodiment has a structure in which the bottom recesses 422 are fitted into each other as described above, so that the movement in the direction along the bottom surface of the bottom recess 422 is restricted, and as a result, deformation of the bottom 4 is prevented. . As a result, the plastic bottle 100 obtains a resistance to a load that can cause deformation, and the entire plastic bottle 100 is hardly deformed.

[Other Embodiments]
Finally, other embodiments of the plastic bottle according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

In the above embodiment, the configuration in which one main circumferential rib 31 is provided has been described as an example. However, without being limited to such a configuration, the plastic bottle according to the present invention may include a plurality of peripheral ribs. However, from the viewpoint of effectively expressing the action of relaxing the load in the vertical direction, it is preferable to have one main peripheral rib as in the above embodiment, and at least one sub peripheral rib in addition to the main peripheral rib. It is preferable to have at least five auxiliary peripheral ribs in addition to the main peripheral rib.

In the above embodiment, the configuration in which the main circumferential rib 31 has seven points 31a at which the depth takes the maximum value and seven points 31b at which the depth takes the minimum value has been described as an example. However, without being limited to such a configuration, the number of points where the depth of the main circumferential rib takes the maximum value and the point where the depth of the main circumferential rib takes the minimum value may be any number as long as they are the same number and a plurality. However, since the action of avoiding the concentration of the load in the horizontal direction can be satisfactorily stated, it is preferable to have 6 to 9 points each of which takes the maximum value and the minimum value of the depth of the main circumferential rib.

In the above embodiment, the configuration in which the maximum value of the depth of the main peripheral rib 31 is 4.5 mm and the minimum value is 3.5 mm has been described as an example. However, without being limited to such a configuration, the maximum value of the depth of the peripheral rib may be 4.0 to 5.5 mm, and the minimum value may be 0.5 to 1.5 mm smaller than the maximum value. . The maximum depth of the circumferential rib is preferably 4.1 to 5.2 mm, and more preferably 4.2 to 5.0 mm. Further, the minimum value of the depth of the peripheral rib is preferably 0.6 to 1.4 mm smaller than the maximum value, and more preferably 0.7 to 1.3 mm smaller.

In the above embodiment, the width of the main circumferential rib 31 in the vertical direction is 8.0 mm at the point 31a where the depth takes the maximum value, and 7.2 mm at the point 31b where the depth takes the minimum value. Described as an example. However, the width of the peripheral rib in the vertical direction may be 6 to 9 mm without being limited to such a configuration. The vertical width of the circumferential rib is preferably 6.2 to 8.8 mm, and more preferably 6.5 to 8.5 mm.

In the above embodiment, the configuration in which the ridge-shaped portion 34a is formed at the portion where the two trunk reference surfaces 34 extending from the two panel first concave portions 33a meet is described as an example. However, without being limited to such a configuration, for example, a planar connection portion may be provided in a region where two trunk reference surfaces meet.

In the above embodiment, the configuration in which the panel first concave portion 33a has a planar shape has been described as an example. However, without being limited to such a configuration, for example, the first recess may have a rib for absorbing reduced pressure.

In the above embodiment, the configuration in which the inner angle of the convex vertex 422a is 70 ° and the inner angle of the concave vertex 422b is 220 ° has been described as an example. However, without being limited to such a configuration, the internal angle of the convex vertex may be more than 60 ° and 80 ° or less. The internal angle of the convex vertex is preferably 63 ° or more and 87 ° or less, and more preferably 65 ° or more and 75 ° or less.

In the above-described embodiment, the configuration in which the length of the diagonal line having the maximum length among the concave hexagonal diagonal lines is 6 mm has been described as an example. However, without being limited to such a configuration, the length of the diagonal line may be 3 to 8 mm. Note that the length of the diagonal is preferably 4 to 7 mm, and more preferably 5 to 7 mm.

In the above embodiment, the configuration in which the depth of the bottom recess 422 is 1.2 mm has been described as an example. However, the depth of the bottom concave portion may be 0.6 to 2.4 mm without being limited to such a configuration. The depth of the bottom recess is preferably 0.5 to 2.5 mm, and more preferably 0.7 to 2.3 mm.

In the above embodiment, the two bottom concave portion rows 423a adjacent to each other, a 2.6mm offset width 423b, which is a half of the length (5.2 mm) configuration of the center line _{C L} has been described as an example. However, the width of the offset may be 40 to 60% of the length of the center line without being limited to such a configuration. The offset width is preferably 45 to 55% of the length of the center line, more preferably 48 to 52%, and particularly preferably 50%.

Regarding other configurations as well, it should be understood that the embodiments disclosed herein are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Accordingly, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

The present invention can be used, for example, in a soft drink container.

DESCRIPTION OF SYMBOLS 100: Plastic bottle 1: Mouth part 2: Shoulder part 3: Torso part 3a: Upper part area | region of a trunk part 3b: Middle part area | region of a trunk | drum 3c: Lower part area | region of a trunk | drum 31: Main circumference rib 32: Sub circumference rib 33: Panel 33a: Panel first concave portion 33b: Panel second concave portion 33c: Panel convex portion 34: Body reference surface 34a: Peak-shaped portion 4: Bottom portion 41: Grounding portion 42: Dome portion 421: Dome central portion 422: Bottom concave portion 422a: Convex vertex of bottom recess 422b: Concave vertex of bottom recess 423 (423a, 423b): Bottom recess column C _A : Center axis C _L : Center line A: Mutual insertion portion of bottom recess

Claims

A plastic bottle comprising a body part, a reduced pressure absorption panel part, and a body reference surface formed around the reduced pressure absorption panel part,
The reduced pressure absorption panel portion extends in the vertical direction of the body portion, and is provided in a shape twisted in the circumferential direction around the central axis of the plastic bottle,
The reduced pressure absorption panel portion has a first concave portion, a second concave portion, and a convex portion,
The first recess is depressed from the trunk reference surface toward the inside of the plastic bottle,
The second recess is provided at the center in the circumferential direction of the first recess so as to be further depressed from the first recess toward the inside of the plastic bottle,
The convex portion is formed with curved surfaces that protrude from the first concave portion toward the outside of the plastic bottle over the entire width in the circumferential direction of the first concave portion at both ends in the vertical direction of the first concave portion. Is,
The width of the convex portion in the up-down direction is the smallest at both ends in the circumferential direction of the convex portion, and is the largest in the circumferential central portion of the convex portion.
Forming a ridge-like portion at a portion where two trunk reference planes extending from two adjacent vacuum absorbing panel portions meet,
The plastic bottle according to claim 1, wherein a distance from the central axis of the trunk portion reference surface is maximum at the ridge portion.
The plastic bottle according to claim 1, wherein the first concave portion is planar.