JPWO2019172080A1 - Plastic bottle - Google Patents

Abstract

The plastic bottle 100 according to the present invention is a plastic bottle having at least one concave peripheral rib 31 on the body portion 3, and the peripheral rib 31 is a plastic bottle having a depth of plunging into the inside from the surface of the plastic bottle 100. It has a wavy horizontal cross-sectional shape that continuously changes along the circumferential direction of 100, the maximum value of the depth of the peripheral rib is 4.5 to 6.0 mm, and the minimum value of the depth of the peripheral rib is It is characterized in that it is 3.5 to 4.4 mm.

Description

The present invention relates to a plastic bottle having at least one concave peripheral rib on the body.

In the process of manufacturing and distributing a beverage filled in a plastic bottle, a load may be applied to the plastic bottle, causing a problem that the plastic bottle is deformed. Examples of the load that causes such deformation are the horizontal load generated by pushing the plastic bottles against each other on the conveyor in the beverage manufacturing process and the vertical load generated by the loading in the distribution process. Can be mentioned. In order to prevent deformation due to these loads, various measures have been taken to improve the strength of the plastic bottle.

As an example of such a device, Patent Document 1 discloses a plastic bottle whose structural strength is improved by providing a reinforcing relief. The plastic bottle provides good resistance to vertical compression without increasing the wall thickness.

Further, Patent Document 2 discloses a plastic bottle in which a plurality of wavy recesses are provided to ensure sufficient strength against an impact or a load applied to a side surface of the container. The plastic bottle achieves good resistance to horizontal loads without increasing wall thickness.

International Publication No. 2007/118966 Japanese Patent Application Laid-Open No. 2012-126448

By the way, in the technique as in Patent Document 1, the proof stress against the load in the horizontal direction may be insufficient. Therefore, for example, in the process of placing and transporting plastic bottles on a conveyor, the plastic bottles may collide with each other and be deformed. This problem has been of particular concern in the transport process involving heating for sterilization, because the strength of the plastic bottle is reduced by heating.

Further, in a technique such as Patent Document 2, the proof stress against a load in the vertical direction may be insufficient. Therefore, it is difficult to increase the number of loads in the vertical direction in the distribution process, which may impair the distribution efficiency.

Therefore, it is required to realize a plastic bottle that can withstand vertical and horizontal loads.

The plastic bottle according to the present invention is a plastic bottle having at least one concave peripheral rib on the body portion, and the peripheral rib has a depth of plunging into the inside from the surface of the plastic bottle. It has a wavy horizontal cross-sectional shape that changes continuously along the direction, the maximum value of the peripheral rib depth is 4.5 to 6.0 mm, and the minimum value of the peripheral rib depth is 3. It is characterized in that it is 5 to 4.4 mm.

According to this configuration, since the peripheral rib has a wavy horizontal cross-sectional shape, it is possible to realize a structure in which the load is less likely to be concentrated, and it is possible to realize the effect that the plastic bottle is less likely to be deformed in the horizontal direction. Further, when the size of the peripheral rib is within the above range, the action of absorbing the load in the vertical direction is exhibited, and the effect that the plastic bottle is less likely to be deformed in the vertical direction can be realized.

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.

In one aspect, the plastic bottle according to the present invention preferably has a width of the peripheral rib in the vertical direction of 7 to 9 mm.

According to this configuration, the action of absorbing the load in the vertical direction can be further enhanced as compared with the plastic bottle which does not satisfy the above-mentioned dimensional range.

As one aspect, the plastic bottle according to the present invention further includes a decompression absorption panel portion on the body portion, and the peripheral rib is a portion of the body portion above the decompression absorption panel portion, or the said. It is preferably provided in a portion below the decompression absorption panel portion.

According to this configuration, the deformation of the plastic bottle due to the increase in internal pressure can be absorbed by the decompression absorption panel.

As one aspect, the plastic bottle according to the present invention preferably includes only one peripheral rib.

According to this configuration, the action of absorbing a load in the vertical direction can be further enhanced as compared with a plastic bottle having a plurality of peripheral ribs having a wavy horizontal cross-sectional shape.

As one aspect, the plastic bottle according to the present invention further includes at least one concave auxiliary peripheral rib, the auxiliary peripheral rib has a circular horizontal cross-sectional shape, and the surface of the auxiliary peripheral rib of the plastic bottle. It is preferable that the depth of plunging into the inside is smaller than the minimum value of the depth of the peripheral rib, and the vertical width of the auxiliary peripheral rib is smaller than the vertical width of the peripheral rib.

According to this configuration, the peripheral rib and the auxiliary peripheral rib work together in a spring shape, and the action of absorbing the load in the vertical direction can be further enhanced.

Further features and advantages of the present invention will be further clarified by the following illustration of exemplary and non-limiting embodiments described with reference to the drawings.

Front view of a plastic bottle. Front sectional view of a plastic bottle. FIG. 1 is a sectional view taken along line III-III in FIG. FIG. 1 is a sectional view taken along line IV-IV in FIG. Front enlarged view of the body of a plastic bottle. FIG. 5 is a sectional view taken along line VI-VI in FIG. FIG. 5 is a sectional view taken along line VII-VII in FIG. Bottom view of the bottom of a plastic bottle. Enlarged view of the bottom of the recess provided at the bottom of the plastic bottle.

An embodiment 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 has a mouth portion 1 as a liquid spout, a shoulder portion 2 continuous with the mouth portion 1 and gradually increasing in diameter toward the bottom surface, and a shoulder. It is composed of a cylindrical body portion 3 continuous with the portion 2 and a bottom portion 4 which is the bottom of the plastic bottle 100. In the following description, the direction of the straight line connecting the centers of the mouth portion 1 and the bottom portion 4 is referred to as "vertical direction", and the direction of the plane orthogonal to the straight line is referred to as "horizontal direction". Further, the "depth" of each structure provided on the surface of the plastic bottle 100 is defined as the depth of plunging into the inside from the surface of the plastic bottle 100.

The plastic bottle 100 according to the present embodiment can be integrally molded by, for example, a stretch molding method such as biaxial stretch blow molding using a thermoplastic resin such as polyethylene, polypropylene, or 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, which are generally distributed. The liquid to be filled in the plastic bottle 100 is not particularly limited, and 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 sauce. Examples include seasonings.

[Rib structure]
In the upper region 3a of the body portion 3, one concave main peripheral rib 31 (example of the peripheral rib) is provided. Further, a plurality of concave auxiliary peripheral ribs 32 are provided in the upper region 3a and the lower region 3c of the body 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 those of the sub peripheral rib 32.

As shown in FIG. 3, the main peripheral rib 31 has a wavy horizontal cross-sectional shape whose depth continuously changes along the circumferential direction of the plastic bottle 100, and the maximum depth thereof is 4.5 mm. The minimum value is 3.5 mm. The main peripheral rib 31 has seven points each having a maximum depth of 31a and a minimum depth of 31b, and the horizontal cross-sectional shape of the main peripheral rib 31 has a depth. It has a wavy shape in which points 31a having a maximum value and points 31b having a minimum depth are alternately and smoothly connected. That is, the horizontal cross-sectional shape is convex in the outward direction of the plastic bottle around the point 31a where the depth takes the maximum value, and is 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 peripheral rib 31 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.

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

When a load in the horizontal direction is applied to the plastic bottle 100, the load can deform the horizontal cross-sectional shape of the plastic bottle 100 into an elliptical shape. However, the plastic bottle 100 according to the present embodiment has a structure in which the load is less likely to be concentrated because the main peripheral rib 31 has a wavy horizontal cross-sectional shape, so that the plastic bottle 100 is less likely to be deformed.

Further, when a load in the vertical direction 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 ribs 31 and the sub-circumferential ribs 32 having different depths and widths, and these ribs jointly act like a spring to apply a load in the vertical direction. Since the relaxing action is exhibited, the plastic bottle 100 is less likely to be deformed.

[Panel structure]
In the central region 3b of the body portion 3, a plurality of panels 33 (examples of the decompression absorption panel portion) recessed in the radial direction are formed side by side in the circumferential direction of the central region 3b (six in the present embodiment) at equal intervals. ing. As shown in FIG. 5, the panel 33 has a shape extending in the vertical direction of the central region 3b, and is provided in a shape twisted in the circumferential direction about the central axis of the plastic bottle 100. Further, a body reference surface 34 is formed around the panel 33.

As shown in FIGS. 5 to 7, the panel 33 has a panel first concave portion 33a, a panel second concave portion 33b, and a panel convex portion 33c. The panel first recess 33a has a flat shape and is provided so as to be recessed from the body reference surface 34 toward the inside of the plastic bottle 100. The panel second recess 33b is provided at the center of the panel first recess 33a in the circumferential direction so as to be recessed from the panel first recess 33a toward the inside of the plastic bottle 100.

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

A peak-shaped portion 34a is formed at a portion where the two body reference surfaces 34 extending from the first panel first recess 33a meet. The distance of the body reference surface 34 from the central axis of the plastic bottle 100 is maximum at the peak-shaped portion 34a.

The decompression absorber provided in a conventional plastic bottle is liable to be deformed radially outward when the bottle is pressurized to fill the beverage, and is liable to cause a dent (so-called sink mark) due to shrinkage during bottle molding. There was a problem in strength such as. The plastic bottle 100 according to the present embodiment realizes the reinforcement of the panel 33 by having the panel convex portion 33c, and the above-mentioned defects due to the deformation are unlikely to occur.

[Bottom structure]
As shown in FIGS. 5, 8 and 9, the bottom 4 has a grounding portion 41 that comes into contact with the installation surface of a desk or the like, and the inside of the plastic bottle 100 toward the inside in the radial direction from the grounding portion 41 (in FIG. 5). A dome portion 42 that plunges into (upper) is formed. A dome central portion 421 having a flat shape is provided in the central portion of the dome portion 42, and a plurality of bottom recesses 422 are provided from the outside of the dome central portion 421 to the inside of the ground contact portion 41.

As shown in FIG. 9, the bottom recess 422 has a concave hexagonal shape (so-called bowtie) having four convex vertices 422a having an internal angle of 70 ° and two concave vertices 422b having an internal angle of 220 ° in a plan view. Shape). Here, the two vertices adjacent to the convex vertices 422a are the convex vertices 422a and the concave vertices 422b, and the two vertices adjacent to the concave vertices 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 It is 2.6 mm corresponding to. The term "offset" as used herein refers to the two recesses of the bottom recess 422 belonging to the other bottom recess row 423b where the straight lines connecting the two concave vertices 422b of the bottom recess 422 belonging to one bottom recess row 423a are 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, three bottom recesses 422 adjacent to each other are arranged so that the two convex vertices 422a and the one concave vertex 422b are close to each other. In other words, the adjacent convex vertices 422a of the two adjacent bottom recesses 422 belonging to the bottom recess row 423a are flat on the outside in the plan view of the concave vertices 422b of the bottom recess 422 belonging to the bottom recess row 423b. It is arranged so as to be fitted visually (part A in FIG. 9). Such a fitting structure is formed in all places where the three bottom recesses 422 are adjacent to each other.

When a conventional plastic bottle is pressurized to fill a beverage, the bottle may be deformed in such a manner that the bottom thereof is pushed downward by an 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 of the bottom recesses 422 in the direction along the bottom surface is restricted, and as a result, the deformation of the bottom portion 4 is hindered. .. By this action, the plastic bottle 100 acquires a proof stress against a load that can cause deformation, and the effect that the entire plastic bottle 100 is less likely to be deformed can be obtained.

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

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

In the above embodiment, the configuration in which the main peripheral rib 31 has seven points each having a point 31a having a maximum depth and a point 31b having a minimum depth has been described as an example. However, without being limited to such a configuration, the points at which the depth of the peripheral ribs take the maximum value and the points at which the depths take the minimum value may be any number as long as they are the same number and plural. 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 having a maximum value and a minimum value of the peripheral rib depth.

In the above embodiment, the configuration in which the maximum depth of the main peripheral rib 31 is 4.5 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 4.5 to 6.0 mm. The maximum depth of the peripheral ribs is preferably 4.5 to 5.5 mm, more preferably 4.5 to 5.1 mm.

In the above embodiment, the configuration in which the minimum depth of the main peripheral rib 31 is 3.5 mm has been described as an example. However, without being limited to such a configuration, the minimum value of the depth of the peripheral rib may be 3.5 to 4.4 mm.

In the above embodiment, the configuration in which the width of the main peripheral rib 31 in the vertical direction is 7.2 mm at the point 31b where the depth takes the minimum value has been described as an example. However, without being limited to such a configuration, the width of the peripheral rib in the vertical direction may be 7 to 9 mm at the point where the depth of the peripheral rib takes the minimum value. The vertical width of the peripheral ribs is preferably 7.1 to 8.8 mm, more preferably 7.2 to 8.6 mm in that the depth of the peripheral ribs takes the minimum value. , 7.2-8.4 mm is particularly preferable.

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

In the above embodiment, a configuration in which the panel first recess 33a has a planar shape has been described as an example. However, without being limited to such a configuration, for example, the panel first recess may have ribs for decompression absorption.

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

In the above embodiment, a configuration in which the length of the diagonal line having the maximum length among the diagonal lines of the concave hexagon 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. The length of the diagonal line is preferably 4 to 7 mm, 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, without being limited to such a configuration, the depth of the bottom recess may be 0.6 to 2.4 mm. The depth of the bottom recess is preferably 0.5 to 2.5 mm, 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, without being limited to such a configuration, the width of the offset may be 40-60% of the length of the centerline. The width of the offset is preferably 45 to 55%, more preferably 48 to 52%, and particularly preferably 50% of the length of the center line.

It should be understood that with respect to other configurations, the embodiments disclosed herein are exemplary in all respects and the scope of the invention is not limited thereto. Those skilled in the art will be able to easily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Therefore, another embodiment modified without departing from the spirit of the present invention is naturally included in the scope of the present invention.

Examples and comparative examples of the present invention are shown below. The invention of the present application is not limited to the following examples.

[Specification of shapes of Examples and Comparative Examples]
The approximate shapes of the bottles of Examples and Comparative Examples are the shapes shown in FIGS. 1 to 9 except for the difference in the numerical values of the dimensions of each part. _{In the following, for each bottle, the depth D max} of the main peripheral rib 31 at the point 31a where the depth of the main peripheral rib 31 takes the maximum value, and the main at the point 31b where the depth of the main peripheral rib 31 takes the maximum value. It was specified by the depth D _min and the width W _{min of the peripheral rib 31.} The dimensions of each bottle are listed in Table 1 below, along with the results of the evaluation tests described below.

[Strength test against vertical load]
Vertical stress was applied to each bottle of Examples and Comparative Examples using a known testing machine, and the stress-strain curve was plotted. As specifications that can withstand the environment during distribution and storage in a warehouse, bottles with a maximum stress value of 210 N or more in the plot were accepted, and bottles with a maximum stress of less than 210 N were rejected. The bottle of the present invention preferably has a vertical load bearing capacity of 210 N or more, and particularly preferably 500 N or more.

[Strength test against horizontal load]
Using a known testing machine, a stress of 20 N was applied from the outside of the body 3 of each of the bottles of Examples and Comparative Examples. In the state where the stress was applied, the horizontal width dimension of the body 3 of each bottle was measured in the direction parallel to the line of action of the stress and the direction perpendicular to the line of action of the stress. Bottles with a difference of 4 mm or less were accepted, and bottles with a difference of more than 4 mm were rejected.

〔Evaluation results〕
Table 1 shows the dimensions of each bottle of Examples and Comparative Examples and the evaluation results of each bottle.

As shown in Table 1, all the bottles of Examples 1 to 3 and Comparative Examples 1 and 2 passed the proof stress test against a vertical load. All bottles showed a vertical load bearing capacity of 500 N or more. From these results, it is considered that the effect of alleviating the load in the vertical direction by the main peripheral rib 31 and the secondary peripheral rib 32 was exhibited in all the bottles.

However, while the bottles of Examples 1 to 3 passed the proof stress test against a horizontal load, the bottles of Comparative Examples 1 and 2 did not pass the same test. This is because the depth of the main peripheral ribs 31 is smaller in Comparative Examples 1 and 2 than in Examples 1 to 3, so that the effect of making it difficult for the load to be concentrated by the main peripheral ribs 31 could not be sufficiently obtained. Conceivable.

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

100: Plastic bottle 1: Mouth 2: Shoulder 3: Body 3a: Upper part of the body 3b: Middle area of the body 3c: Lower part of the body 31: Main circumference rib 32: Secondary rib 33: Panel 33a: Panel first concave part 33b: Panel second concave part 33c: Panel convex part 34: Body reference surface 34a: Peak-shaped part 4: Bottom part 41: Grounding part 42: Dome part 421: Dome center part 422: Bottom concave part 422a: bottom recess of the convex vertex 422b: bottom concave vertex of the recess 423 (423a, 423b): bottom concave portion rows C _a: the central axis C _L: center line a: interpenetrating part of the bottom recess

Claims (5)

A plastic bottle with at least one concave peripheral rib on the body.
The peripheral rib has a wavy horizontal cross-sectional shape in which the depth of intrusion from the surface of the plastic bottle continuously changes along the circumferential direction of the plastic bottle.
The maximum depth of the peripheral rib is 4.5 to 6.0 mm.
A plastic bottle having a minimum depth of the peripheral ribs of 3.5 to 4.4 mm. The plastic bottle according to claim 1, wherein the width of the peripheral rib in the vertical direction is 7 to 9 mm at a point where the depth of the peripheral rib takes a minimum value. The body is further provided with a decompression absorption panel.
The plastic according to claim 1 or 2, wherein the peripheral rib is provided in a portion of the body portion above the decompression absorption panel portion or a portion below the decompression absorption panel portion. Bottle. The plastic bottle according to any one of claims 1 to 3, further comprising only one peripheral rib. Further equipped with at least one concave auxiliary peripheral rib,
The auxiliary peripheral rib has a circular horizontal cross-sectional shape and has a circular horizontal cross-sectional shape.
The depth of the secondary ribs penetrating from the surface of the plastic bottle into the inside is smaller than the minimum value of the depth of the peripheral ribs.
The plastic bottle according to any one of claims 1 to 4, wherein the vertical width of the secondary rib is smaller than the vertical width of the peripheral rib.

Images