WO2015068763A1

WO2015068763A1 - Plastic bottle

Info

Publication number: WO2015068763A1
Application number: PCT/JP2014/079440
Authority: WO
Inventors: 岩下　寛昌
Original assignee: ザコカ・コーラカンパニー; 岩下　寛昌
Priority date: 2013-11-06
Filing date: 2014-11-06
Publication date: 2015-05-14
Also published as: JP2015089826A; JP6335475B2

Abstract

The present invention provides a plastic bottle that makes it possible to ensure adequate usability even when a large bottle is reduced in weight, and that can deal with a top load in an effective manner. A plastic bottle (1) having indents (80) for finger insertion on at least a part of a constricted part (40) of a trunk part (4) has a plurality of circumferential ribs (100, 102, 104, 106) formed as recesses so that gaps are present in the vertical direction at a vertical position that includes the constricted part (40) and the indents (80). The circumferential ribs (102, 106) comprise divided circumferential ribs which extend circumferentially around the trunk part (4), the divided circumferential ribs being divided so as to be non-continuous at bottom surfaces (82, 84) of the indents (80). The bottom surfaces (82, 84) of the indents (80) are configured to deform so as to bulge when a top load (F) is applied to the plastic bottle (1) and return from the deformed shape when the top load (F) is released.

Description

Plastic bottle

The present invention relates to a plastic bottle.

Plastic bottles are widely used as beverage PET bottles, and their weight reduction is required. However, the reduced-weight bottle is weak against forces such as top load (vertical compressive load) and lateral pressure. For this reason, various measures have been taken such as forming an annular concave rib in the bottle body to increase the strength (see Patent Document 1).

For example, in the case of a large bottle exceeding 1 liter, usability such as ease of holding and ease of pouring is required. For such usability, contrivances such as forming a constricted part in the bottle body part and forming a hollow part for inserting a finger in the bottle body part are provided (see Patent Document 2).

JP 2011-116427 A JP 2005-247393 A

¡Bottles filled with beverages and other contents are transported and stored in cardboard boxes in units of several to several tens and stacked on a pallet. For this reason, each bottle in the lower cardboard box is top-loaded by the cardboard box on the upper side.

However, when a top load acts on a lightweight bottle having a portion where the cross section of the bottle is rapidly changing, such as a constricted portion or a hollow portion for inserting a finger, stress concentrates on the portion. As a result, when the top load exceeds a predetermined value, there is a problem that irreversible deformation occurs and the commercial value is impaired.

In order to solve the bottle deformation problem due to the top load, it is not desirable to eliminate the constricted portion and the recessed portion because the usability of the large bottle cannot be ensured.
On the other hand, from the viewpoint of securing strength, generally, an annular concave rib as in Patent Document 1 is provided to cope with the problem. In this case, according to a general design concept, an annular concave rib is formed over the circumferential direction of the hollow portion and the constricted portion. With such a design, the stress concentration portion is caused by the top load. The lower peripheral portion (for example, symbol S3 in FIG. 7) (for example, symbol S1 in FIG. 7) is deformed so as to swell, and the cardboard box is swollen. As a result, in the worst case, the cardboard box may collapse, which may hinder transportation and storage.

The present invention has been made in view of the above background, and its purpose is to ensure usability even when a large bottle is reduced in weight and to effectively cope with top load. It is to provide a plastic bottle that can be.

In order to achieve the above object, the plastic bottle of the present invention has a finger insertion recess in at least a part of the constriction of the bottle body, and the upper and lower positions are included in the vertical position including the constriction and the recess. A plurality of peripheral ribs formed in a concave shape at intervals in a direction, and at least one of the plurality of peripheral ribs is divided so as to be discontinuous at least at a part of the bottom of the recess, The bottom part of the hollow part is deformed so as to swell when the top load is applied to the plastic bottle, and the deformation is the original when the top load is released. And a pressure absorbing surface configured to return to the above.

According to the present invention, since the strength can be increased by the plurality of peripheral ribs, it is possible to suppress deformation such that when the consumer grips the constricted part and puts a finger into the recessed part during use, they are bent. it can. Therefore, even when the plastic bottle is enlarged and reduced in weight, it is possible to ensure strength that allows usability such as ease of holding and ease of pouring.

In addition, not all of the peripheral ribs are formed over the entire circumference of the bottle body, but at least one of the peripheral ribs is a divided peripheral rib having a discontinuous portion at the bottom of the recess. Do not increase the strength of the bottom more than necessary. In other words, it is possible to achieve both the provision of strength necessary for usability to the depression and the provision of flexibility (movable pressure absorbing surface) that can effectively cope with the top load. it can.

Thus, when the top load is applied, the pressure absorbing surface of the recess is deformed so as to swell, so that the stress concentrated on the recess is absorbed. Therefore, it is possible to prevent the peripheral portion of the recess from irreversibly deforming, and as a result, it is possible to increase the buckling strength of the bottle with respect to the top load. In addition, since the position where the pressure absorbing surface bulges is the bottom of the hollow portion, for example, even if a large top load is applied to a plastic bottle packed in the cardboard box, it is possible to prevent the cardboard box from swelling. On the other hand, when the top load is released, the deformation of the pressure absorbing surface returns to its original state, so that it is possible to prevent the commercial value of the plastic bottle from being impaired.

According to a preferred aspect of the present invention, the divided circumferential rib has an upper divided circumferential rib and a lower divided circumferential rib, and each of the upper and lower divided circumferential ribs is recessed in the respective rib portions. The bottom of the part should be reached.

According to this configuration, the strength for usability and the flexibility for top load can be balanced with respect to the depression.

Preferably, the pressure absorbing surface has a first pressure absorbing surface having a discontinuous portion of the upper divided peripheral rib and parallel to the vertical direction, and a discontinuous portion of the lower divided peripheral rib. And a second pressure absorbing surface that is inclined outwardly downward.

According to this configuration, it has two pressure absorbing surfaces with different extending directions, so it improves the fit when the consumer inserts his / her finger during use, and feels easy to hold and pour. Can be made. In addition, when the top load is applied, the process and behavior of swelling between the two pressure absorbing surfaces can be made different, so that the stress is absorbed smoothly. In particular, the inclination of the second pressure absorption surface facilitates the behavior when the second pressure absorption surface swells, so that the second pressure absorption surface can be smoothly expanded. .

More preferably, the discontinuous portions of the upper and lower divided peripheral ribs may be formed in the central portions of the first and second pressure absorbing surfaces, respectively.

By doing so, it is intended that the first and second pressure absorbing surfaces are deformed so as to swell at the center when the top load is applied. Thereby, the 1st and 2nd pressurization absorption surfaces become easy to move, and stress absorption can be performed smoothly.

Preferably, the plurality of circumferential ribs may include a transverse circumferential rib that crosses the bottom of the recess so as to partition the first pressure absorbing surface and the second pressure absorbing surface.

れば According to this configuration, the recess can be reinforced. Moreover, since the first and second pressure absorbing surfaces are easily swelled by different processes and behaviors when the top load is applied, the stress absorption can be smoothly performed.

According to another preferable aspect of the present invention, the pressure absorbing surface includes a first pressure absorbing surface having a discontinuous portion of the divided circumferential rib, and a plurality of convex vertical portions instead of the divided circumferential rib. It is good to have the 2nd pressurization absorption surface which formed the rib.

According to this configuration, the strength for usability and the flexibility for top load can be balanced with respect to the depression. In particular, since the direction of the convex vertical rib is aligned with the direction in which the second pressure absorbing surface swells when the top load is applied, the strength required for the second pressure absorbing surface is ensured. Can be inflated smoothly.

In this case, similarly to the above, the first pressure absorption surface may be parallel to the vertical direction, and the second pressure absorption surface may be inclined outwardly downward.

This is because the finger fit during use can be improved and smooth stress absorption during top load action can be promoted.

Preferably, the bottle body portion is based on a square cross-sectional shape, and the recess portion is preferably formed symmetrically on four surfaces constituting the square.

By doing so, it is possible to improve usability because the plastic bottle can be gripped by putting the finger into the opposite recesses regardless of the direction from which the plastic bottle is gripped. Further, when the top load is applied, a force is applied evenly in the circumferential direction of the bottle body, so that the pressure absorbing surface can absorb the stress in a balanced manner.

Fig.1 (a) and (b) are the perspective views which looked at the plastic bottle which concerns on 1st Embodiment from another angle, respectively. It is a front view of the plastic bottle of FIG. It is the side view seen from the angle which shifted the plastic bottle of FIG. 2 45 degree | times. It is a top view of the plastic bottle of FIG. It is a bottom view of the plastic bottle of FIG. FIG. 6A is an enlarged front view showing the periphery of the constricted portion of the plastic bottle of FIG. 2, and FIG. 6B is a half end view taken along line bb of FIG. 6A. FIG. 7A is an enlarged front view showing the periphery of the constricted portion of the plastic bottle according to the comparative example, and FIG. 7B is a half end view taken along the line bb of FIG. 7A. It is a graph which shows the experimental result regarding the plastic bottle filling buckling strength of the plastic bottle of FIG. 2 and the comparative example of FIG. It is an enlarged front view which shows the constriction part periphery of the plastic bottle which concerns on 2nd Embodiment. FIG. 10 is an end view of a cross-sectional shape cut along line XX in FIG. 9. FIGS. 11A and 11B are perspective views of the plastic bottle according to the third embodiment as seen from different angles. FIG. 12A is an enlarged front view showing the periphery of the constricted portion of the plastic bottle of FIG. 11, and FIG. 12B is a half end view taken along the line bb of FIG. 12A.

A plastic bottle according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
In the following description, the direction where the bottle mouth is present is referred to as the upper side, and the direction where the bottle bottom is present is referred to as the lower side. A cross-sectional shape means a cross-sectional shape in a plane orthogonal to the central axis of the bottle.

(First embodiment)
As shown in FIGS. 1 to 5, a plastic bottle 1 (hereinafter referred to as “bottle 1”) has a mouth portion 2, a shoulder portion 3, a trunk portion 4, and a bottom portion 5 in order from the upper side. These parts (2, 3, 4 and 5) are integrally formed and constitute a bottomed cylindrical bottle wall for storing a drink inside. As a beverage, it is suitable for storing non-carbonated beverages such as water, green tea, oolong tea, blended tea, sports drink or fruit juice. The bottle 1 is suitable for a large-sized bottle having a capacity exceeding 1 liter, and is used for 2 liters here.

The bottle 1 is molded by a stretch molding method such as biaxial stretch blow molding using, for example, a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material.
An example of the manufacturing process of the bottle 1 will be described. First, a thermoplastic resin is injected into a mold, and a preform is injection molded. The preform is composed of a mouth portion having the same shape as the mouth portion 2 and a bottomed cylindrical portion continuous to the lower side thereof. After injection molding, the preform is set on a blow molding machine and the tubular portion of the preform is heated. And while extending a cylindrical part to a vertical direction with an extending | stretching rod, compressed air is blown and a cylindrical part is extended to a horizontal direction. The stretched cylindrical portion is pressed against the inner surface of the mold and then solidified. Thereby, the shoulder part 3, the trunk | drum 4, and the bottom part 5 are shape | molded, and a series of shaping | molding of the bottle 1 is completed.

The mouth 2 is open at the top and functions as a spout for beverages. The opening of the mouth 2 is opened and closed by a cap (not shown). The shoulder 3 has a transverse section that gradually expands downward, and the mouth 2 having the smallest diameter in the bottle 1 is connected to the upper end of the body 4 that forms the maximum width in the bottle 1. The shoulder 3 is formed with a plurality of ribs 10 extending radially from the mouth 2 to the upper end of the body 4. Further, the twill line connecting the shoulder portion 3 and the upper end of the body portion 4 is a substantially sinusoidal curve extending alternately and repeatedly between the crest portion 12 and the trough portion 14 in the circumferential direction. Specifically, corresponding to the square cross-sectional shape of the body portion 4, the top portion of the mountain portion 12 is located in the middle of one side of the square, and the top portion of the valley portion 14 is located at the corner of the square. Thereby, the buckling strength of the shoulder part 3 is raised. The bottom 5 is composed of a bottom wall 21 and a peripheral wall 22. The peripheral wall 22 is slightly depressed downward, and the lower end of the body portion 4 is continued to the bottom wall 21. The shapes of the mouth part 2, the shoulder part 3, and the bottom part 5 are not particularly limited, and can be appropriately designed.

The body 4 is a rectangular tube-shaped portion based on a square cross-sectional shape. Specifically, as shown in FIGS. 4 and 5, the square cross-sectional shape of the body 4 is such that the four corners 31 of the square are arcs, and the straight part 33 is formed between the

adjacent corners

31, 31. Have.

The barrel part 4 has a constricted part 40 and a hollow part 80 for inserting a finger in the middle of the vertical direction. As shown in FIG. 3, when the body portion 4 is divided into three areas in the vertical direction, the body portion 4 includes a constricted portion 40, an upper body portion 42 above the constricted portion 40, and a lower side of the constricted portion 40. And the lower body portion 44. The upper body portion 42 and the lower body portion 44 are portions having a constant square cross-sectional shape in the vertical direction. In the upper body portion 42 and the lower body portion 44, a plurality of continuous grooves 50 and a plurality of intermittent grooves 52 extending in the circumferential direction are alternately formed in the vertical direction.

The constricted part 40 includes a pinch part 60 most narrowed in the body part 4, an upper inclined part 62 that connects the pinch part 60 to the upper body part 42, and a lower inclined part that connects the pinch part 60 to the lower body part 44. 64. The constricted portion 40 is formed asymmetrically in the vertical direction over the entire circumference, and the lower inclined portion 64 has a gentler inclination angle than the upper inclined portion 62 and gradually expands in the radial direction as the distance from the pinch portion 60 increases. Is formed. In this way, by setting the lower inclined portion 64 to a relatively shallow inclination angle, when the consumer grips the constricted portion 40, it is easy to apply a hand to the lower inclined portion 64, and the fit can be enhanced. . The boundary between the lower inclined portion 64 and the lower trunk portion 44 is partitioned by the dividing circumferential rib 106. On the other hand, at the boundary between the upper inclined portion 62 and the upper body portion 42, there is a twill line 70 that synthesizes them. It is formed with. The crest portion 72 and the trough portion 74 are at positions corresponding to the corner portion 31 and the straight portion 33 in the square cross-sectional shape of the body portion 4, respectively, and the top portion of the trough portion 74 is located in the middle of one side of the square. ing.

The hollow portion 80 is formed on the four surfaces (straight line portion 33) in the square cross-sectional shape of the body portion 4 so as to be symmetric in the front-rear direction and in the left-right direction. Therefore, the

depressions

80 and 80 located on the front and back surfaces of the body part 4 face each other, and the

depressions

80 and 80 located on the left and right faces of the body part 4 face each other. Are formed in the same shape at the same height level. Further, the recessed portion 80 is formed at a position deeper than the constricted portion 40. That is, the recessed portion 80 is formed by a portion where the side surface of the body portion 4 is recessed from the constricted portion 40, and is located inside the bottle from the constricted portion 40. Further, the recess 80 is formed over substantially the entire region in the height direction of the constricted portion 40, and a part thereof is formed outside the constricted portion 40. Specifically, the recess 80 has an upper end located at the upper inclined portion 62 of the constricted portion 40 and a lower end located at the upper portion of the lower trunk 44. The height of the recess 80 is longer than the width, and is high enough to allow, for example, two to three fingers to be inserted vertically by an adult consumer.

As shown in FIG. 6, the hollow portion 80 has an upper bottom surface 82 that extends parallel to the vertical direction and a lower bottom surface 84 that is inclined outwardly downward. Further, the recess 80 has an upper inclined surface 90 connected to the upper side of the upper bottom surface 82, and a lower inclined surface 92 connected to the lower side of the lower bottom surface 84. The upper inclined surface 90 is connected to the inclined surface 62a at an angle different from the inclined surface 62a of the upper inclined portion 62. Further, the lower inclined surface 92 is connected to the flat surface 44 a of the lower body portion 44. The upper inclined surface 90 and the lower inclined surface 92 constitute upper and lower surfaces in the peripheral wall portion of the recess 80. The left and right surfaces of the peripheral wall portion of the recess 80 are formed by

inclined surfaces

94 and 96 that are inclined to rise outward from the left and right ends of the upper bottom surface 82 and the lower bottom surface 84, respectively.

The constricted portion 40 and the recessed portion 80 are formed with

circumferential ribs

100, 102, 104, 106 formed in a concave shape with a space in the vertical direction. Among these, the

circumferential ribs

100 and 104 are configured as transverse circumferential ribs that are formed across the circumferential direction of the body portion 4 across the bottom of the recess 80. Specifically, the transverse circumferential rib 100 crosses the upper end portion of the upper bottom surface 82, and the transverse circumferential rib 104 crosses these boundary portions so as to partition the upper bottom surface 82 and the lower bottom surface 84. is doing. On the other hand, of the remaining peripheral ribs, the

peripheral ribs

102 and 106 are configured as divided peripheral ribs that are divided so as to be discontinuous at the bottom of the recess 80 and extend in the circumferential direction of the body 4. Specifically, the divided peripheral rib 102 has a rib portion that extends from the left and right

inclined surfaces

94, 96 of the recess 80 to a part of the upper bottom surface 82, but is not continuous at the center position of the upper bottom surface 82. It has become. Similarly, the divided peripheral rib 106 extends from the left and right

inclined surfaces

94 and 96 of the recess 80 to a part of the lower bottom surface 84, but is not continuous at the center position of the lower bottom surface 84. It has become. The discontinuous portion 102a in the divided peripheral rib 102 and the discontinuous portion 106a in the divided peripheral rib 106 are formed in the center portion of the upper bottom surface 82 and the central portion of the lower bottom surface 84, respectively, at positions aligned in the vertical direction. . The transverse circumferential rib 100 and the divided circumferential rib 102 are located in the pinch portion 60 described above.

As described above, the circumferential ribs formed in the constricted portion 40 and the recessed portion 80 are not all transverse circumferential ribs, but are partially divided

circumferential ribs

102 and 106, so that the upper bottom surface 82 of the recessed portion 80 is obtained. The lower bottom surface 84 functions as a pressure absorbing surface. That is, the upper bottom surface 82 and the lower bottom surface 84 are configured to deform so as to swell when a top load of a predetermined value or more is applied to the bottle 1, and to return to the original state when the top load is released. It functions as a first pressure absorbing surface and a second pressure absorbing surface. This point will be described in detail below.

First, for comparison, an example in which all circumferential ribs are formed as transverse circumferential ribs is shown in FIG. As shown in FIG. 7, the peripheral ribs 102 ′ and 106 ′ that are the transverse peripheral ribs cross the upper bottom surface 82 and the lower bottom surface 84, respectively. Other configurations are the same as the configurations according to the present embodiment. The circumferential rib increases the strength of the bottle 1, and the transverse circumferential rib increases the strength compared to the divided circumferential rib. Therefore, the strength of the bottom of the recess 80 ′ according to the comparative example is improved as compared with the bottom of the recess 80 according to the present embodiment, and the bottom is less deformed with respect to the load.

Here, during the transportation and storage of the bottle 1, the top load F is applied to the bottle 1 (see: FIGS. 2 and 7). When the top load F is applied, stress concentration occurs where the cross section of the bottle 1 is changing rapidly. In the case of the comparative example shown in FIG. 7, a large stress concentration occurs in the area S1, which is the lower portion of the recess 80 ′. Until the top load F reaches a certain size, the dotted portion S3 of the lower portion of the area S1 is deformed so as to swell. This is because the upper bottom surface 82 and the lower bottom surface 84 of the recess 80 ′ according to the comparative example are strong surfaces due to the transverse circumferential ribs 102 ′ and 106 ′, and the deformation thereof is sufficiently suppressed. Because. When the dotted pattern portion S3 swells, when the bottle is packed in the cardboard box, the dotted card portion swells at the dotted pattern portion S3, which hinders transportation and storage. When the top load F exceeds a certain size, the dotted pattern portion S3 is irreversibly deformed at a stretch.

On the other hand, in the bottle 1 according to the present embodiment shown in FIG. 6, the strength of the upper bottom surface 82 and the lower bottom surface 84 of the recessed portion 80 is lower than that of the comparative example using the divided

peripheral ribs

102 and 106. As a result, when the top load F is applied, due to the stress concentration generated in the area S1, the upper bottom surface 82 and the lower bottom surface 84 are deformed so as to swell and exhibit a stress absorbing function. Thereby, since the peripheral part (dotted pattern part S3) of the hollow part 80 is suppressed like a comparative example, it is suppressed that a swollen body arises in a cardboard box. When the top load F is released, the swelled deformation of the upper bottom surface 82 and the lower bottom surface 84 is elastically restored to the original state.

FIG. 8 is a graph showing experimental results when a longitudinal compression load is applied to a bottle according to this embodiment and a comparative example in a state where the bottle is filled with water and closed. In FIG. 8, the vertical axis indicates the filling buckling strength, and the horizontal axis indicates the compression distance in the vertical direction. As shown in FIG. 8, in the bottle 1 of this embodiment, as a result, the buckling strength with respect to the top load F is larger than that of the comparative example. This is because, as described above, the upper bottom surface 82 and the lower bottom surface 84 are deformed so as to swell, thereby absorbing the stress.

The operational effects of the bottle 1 of the present embodiment described above will be described.

Since the constricted portion 40 and the recessed portion 80 are reinforced by a plurality of peripheral ribs (transverse

peripheral ribs

100 and 104, and divided peripheral ribs 102 and 106), the consumer grasps the constricted portion 40 and uses the recessed portion 80 during use. Deformation such that they are bent when a finger is put in is suppressed. Thereby, even if it is a case where the bottle 1 is enlarged and reduced in weight, the intensity | strength which can realize usability, such as easiness of holding and pouring, can be ensured.

Further, the strength required for such usability is imparted to the recess 80, and the bottom of the recess 80 is separated from the upper bottom surface 82 and the lower bottom surface 84 by the

discontinuous portions

102 a and 106 a of the divided

peripheral ribs

102 and 106. By setting this, flexibility (movability) corresponding to the top load F can be provided effectively. Thereby, when the top load F of a predetermined value or more acts, the upper bottom surface 82 and the lower bottom surface 84 are deformed so as to swell, thereby absorbing the stress. On the other hand, when the top load F is released, the deformation is restored. It becomes like this. As a result, the irreversible deformation around the recess 80 and the problem of the cardboard box swelling are eliminated, and the bottle 1 has improved buckling strength as a whole.

The flexibility of the upper bottom surface 82 and the lower bottom surface 84 can be adjusted by the size of the

discontinuous portions

102a, 106a (division length) of the divided

peripheral ribs

102, 106 during design, It can also be adjusted by the cross-sectional shape of the rib portions of the divided

peripheral ribs

102 and 106. Moreover, it can also adjust by increasing / decreasing the number of the dividing peripheral ribs. As an example, one of the divided

peripheral ribs

102 and 106 can be configured as a transverse peripheral rib, and the discontinuous portion can be increased. However, as in the present embodiment, from the viewpoint of balancing the strength for usability and the flexibility for top load in a balanced manner, the divided peripheral ribs 102 are provided at the center portions of the upper bottom surface 82 and the lower bottom surface 84. 106,

discontinuous portions

102a, 106a are preferably set.

In the present embodiment, the upper bottom surface 82 and the lower bottom surface 84 are two pressure absorbing surfaces having different extending directions. Therefore, when the top load F acts, the upper bottom surface 84 and the lower side surface are separated. The process and behavior of swelling with the bottom surface 84 can be varied. Thereby, stress is absorbed more smoothly. Further, the lower bottom surface 84 is swelled smoothly because of its inclination, the behavior when it swells is promoted.

(Second Embodiment)
Next, with reference to FIG.9 and FIG.10, the bottle 200 which concerns on 2nd Embodiment is demonstrated. The difference from the bottle 1 of the first embodiment is that the transverse circumferential rib 104 is changed to the divided circumferential rib 204, the rib portion of the divided circumferential rib 106 is not extended to the recessed portion 80, and This is that a plurality of convex vertical ribs 210 are formed on the lower bottom surface 84. About the same structure, the same code | symbol is attached | subjected suitably and description is abbreviate | omitted.

The vertical ribs 210 extend along the inclination of the lower bottom surface 84 and are arranged in parallel in the width direction of the lower bottom surface 84. The vertical rib 210 is formed of, for example, an arc surface of R1.5 having a center of curvature inside the bottle. By forming the vertical ribs 210 on the lower bottom surface 84, the lower bottom surface 84 is reinforced. However, the reinforcing effect by the vertical rib 210 is smaller than the reinforcing effect by the concave peripheral rib.

Also in the present embodiment, as in the first embodiment, the upper surface 82 and the lower bottom surface 84 of the recess 80 are effective against the top load F while giving the recess 80 the strength necessary for usability. Corresponding flexibility (movability) can be provided. In particular, since the convex direction of the vertical rib 210 and the direction in which the lower bottom surface 84 bulges outward when the top load F acts, the necessary strength is secured to the lower bottom surface 84. The lower bottom surface 84 can be inflated smoothly.

It should be noted that the balance between the flexibility and the reinforcing effect of the lower bottom surface 84 can be adjusted by the number and shape of the vertical ribs 210. Further, the dividing peripheral rib 204 may be a transverse peripheral rib as in the first embodiment.

(Third embodiment)
Next, with reference to FIG.11 and FIG.12, the bottle 300 which concerns on 3rd Embodiment is demonstrated. The difference from the bottle 1 of the first embodiment is that the

peripheral ribs

102, 104, 106 are changed to

peripheral ribs

302, 304, 306, and that the upper bottom surface 82 and the lower bottom surface 84 have a plurality of convex vertical shapes. This is the point where the

ribs

310 and 320 are formed. About the same structure, the same code | symbol is attached | subjected suitably and description is abbreviate | omitted.

The circumferential rib 302 is configured as a transverse circumferential rib that crosses the upper bottom surface 82. The

circumferential ribs

304 and 306 are configured as divided circumferential ribs that do not cross the upper bottom surface 82 and the lower bottom surface 84. Here, the divided

circumferential ribs

304 and 306 are not formed in the recess 80 so that the rib portions do not extend to the recess 80.

The

vertical ribs

310 and 320 have the same configuration as that of the vertical rib 210 of the second embodiment. Each of the

vertical ribs

310 and 320 includes, for example, an R5 arc surface having a center of curvature inside the bottle. 4 in parallel in the width direction. The vertical rib 310 extends in the vertical direction from the boundary between the upper bottom surface 82 and the lower bottom surface 84 to the transverse circumferential rib 320, and the vertical rib 320 is inclined to the lower bottom surface 84 so as to be continuous with the vertical rib 310. It extends along.

Also in the present embodiment, as in the first embodiment, the upper surface 82 and the lower bottom surface 84 of the recess 80 are effective against the top load F while giving the recess 80 the strength necessary for usability. Corresponding flexibility (movability) can be provided. In particular, since the convex direction of the

vertical ribs

310 and 320 matches the direction in which the upper bottom surface 82 and the lower bottom surface 84 bulge outward when the top load F acts, the upper bottom surface 82 and the lower side These can be smoothly inflated while ensuring the necessary strength for the bottom surface 84.

As described above, the balance between the flexibility and the reinforcing effect of the upper bottom surface 82 and the lower bottom surface 84 can be adjusted by the number and shape of the

vertical ribs

310 and 320. Further, the transverse circumferential rib 302 may be a divided circumferential rib as in the first embodiment.

The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. For example, the cross-sectional shape of the trunk | drum 4 can be made into a rectangle. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

1: bottle, 4: trunk, 40: constriction, 42: upper trunk, 44: lower trunk, 80: depression, 82: upper bottom (first pressure absorbing surface), 84: lower Bottom surface (second pressure absorbing surface), 100: transverse circumferential rib, 102: divided circumferential rib, 102a: discontinuous portion, 104: transverse circumferential rib, 106: divided circumferential rib, 106a: discontinuous portion, 204: Dividing circumferential ribs 204, 210: vertical ribs, 302: transverse circumferential ribs, 304: divided circumferential ribs, 306: divided circumferential ribs, 310: longitudinal ribs, 320: longitudinal ribs, F: top load

Claims

A plastic bottle having a recess for inserting a finger in at least a part of the constriction of the bottle body,
At a position in the vertical direction including the constricted part and the hollow part, it has a plurality of peripheral ribs formed in a concave shape with an interval in the vertical direction,
At least one of the plurality of circumferential ribs is a divided circumferential rib that is divided so as to be discontinuous at least at a part of the bottom of the recess and extends in the circumferential direction of the bottle body,
The bottom of the recess is deformed so as to swell when a top load is applied to the plastic bottle, and the pressure absorption is configured so that the deformation is restored when the top load is released. A plastic bottle with a surface.
The divided circumferential rib has an upper divided circumferential rib and a lower divided circumferential rib,
2. The plastic bottle according to claim 1, wherein each of the upper and lower divided peripheral ribs has a rib portion reaching the bottom of the recess.
The pressure absorbing surface is
A first pressure absorbing surface having a discontinuous portion of the upper divided peripheral rib and parallel to the vertical direction;
The plastic bottle according to claim 2, further comprising: a second pressure absorbing surface having a discontinuous portion of the lower divided peripheral rib and inclined outwardly downward.
The plastic bottle according to claim 3, wherein the discontinuous portions of the upper and lower divided peripheral ribs are respectively formed in the center portions of the first and second pressure absorbing surfaces.
5. The plurality of circumferential ribs have transverse circumferential ribs that traverse the bottom of the recess so as to partition the first pressure absorption surface and the second pressure absorption surface. Plastic bottle as described in.
The pressure absorbing surface is
A first pressure absorbing surface having a non-continuous portion of the dividing circumferential rib;
2. The plastic bottle according to claim 1, further comprising a second pressure absorbing surface formed with a plurality of convex vertical ribs instead of the divided peripheral ribs.
The first pressure absorbing surface is parallel to the vertical direction,
The plastic bottle according to claim 6, wherein the second pressure absorbing surface is inclined outwardly downward.
The bottle body is based on a square cross-sectional shape,
The plastic bottle according to any one of claims 1 to 7, wherein the hollow portion is formed symmetrically on four surfaces constituting the square.