JP6131627B2 - Plastic bottle - Google Patents

Description

  The present invention relates to a plastic bottle that can be easily gripped and can improve buckling strength.

  Recently, plastic bottles having a square cylindrical body have become common as beverage bottles, and the internal solution is stored in such plastic bottles.

  The square cylindrical body of the plastic bottle has four side surfaces, and each side surface is provided with a grip portion that can be easily gripped. Further, the body portion of the plastic bottle is provided with a horizontal concave rib that divides the body portion upward and downward, and generally the gripping portion is provided on the horizontal concave rib.

  In use, the user grips the grip portions of the pair of side surfaces facing each other out of the body portion. By the way, in recent years, the plastic bottle has been made thinner, and the rigidity of the entire plastic bottle has been reduced. In this case, when the user grips the grip portion of the pair of side surfaces, due to the decrease in the rigidity of the plastic bottle, the other pair of opposite side surfaces protrude outward or the content liquid is discharged outward. Sometimes.

  By the way, a body boundary surface is formed between the adjacent side surfaces of the plastic bottle, and it is also considered to prevent deformation of the entire plastic bottle by gripping a pair of opposing body surface boundary surfaces. The pair of body boundary surfaces does not include a configuration as a gripping part, and therefore it is difficult to grip a pair of body boundary surfaces facing each other.

Japanese Utility Model Sho 56-118806

  The present invention has been made in view of such points, and an object of the present invention is to provide a plastic bottle that can be easily gripped and can increase the overall buckling strength.

  The present invention is a plastic bottle, comprising a cylindrical mouth portion, a rectangular tubular trunk portion, a shoulder portion disposed between the mouth portion and the trunk portion, and a bottom portion below the trunk portion, Each has four side surfaces and a body boundary surface located between the side surfaces, and each of the body boundary surfaces has a gripping rib projecting outward at each of at least a pair of opposing body boundary surfaces. A plastic bottle characterized in that a gripping rib on a pair of body boundary surfaces provided and opposed to each other can be gripped.

  The present invention is a plastic bottle characterized in that gripping ribs protruding outward are provided on all four body boundary surfaces.

  The present invention is the plastic bottle characterized in that each gripping rib extends in the longitudinal direction.

  The present invention is provided with a horizontal concave rib composed of a side horizontal concave rib provided on each side of the body and a boundary horizontal concave rib provided on each body boundary surface. The plastic bottle is characterized in that an uneven gripping portion is provided, and the gripping rib is provided in the boundary surface horizontal concave rib.

  The present invention is a plastic bottle characterized in that a plurality of gripping ribs are provided in a horizontal direction on one body boundary surface.

  The present invention is a plastic bottle characterized in that a plurality of gripping ribs are provided in the vertical direction on one body boundary surface.

  According to the present invention, the gripping ribs projecting outward are provided at least on each of the pair of opposing body boundary surfaces among the body boundary surfaces, so that the gripping of the pair of opposing body boundary surfaces is performed. By gripping the rib, the plastic bottle can be easily gripped. Further, the buckling strength of the entire plastic bottle can be increased by the gripping ribs provided on the pair of body boundary surfaces.

FIG. 1 is a front view showing a plastic bottle according to a first embodiment of the present invention. FIG. 2 is a view showing the plastic bottle according to the first embodiment of the present invention, as seen from a different angle from FIG. FIG. 3 is a perspective view showing a plastic bottle according to the first embodiment of the present invention. FIG. 4 is a plan view showing a plastic bottle according to the first embodiment of the present invention. FIG. 5 is a bottom view showing the plastic bottle according to the first embodiment of the present invention. FIG. 6A is an enlarged view showing the gripping rib according to the first embodiment of the present invention, and FIG. 6B is an enlarged perspective view showing the gripping rib. FIG. 7 is a front view showing a plastic bottle according to a second embodiment of the present invention. FIG. 8 is a view showing a plastic bottle according to the second embodiment of the present invention, as seen from a different angle from FIG. FIG. 9 is a perspective view showing a plastic bottle according to a second embodiment of the present invention. FIG. 10A is an enlarged view showing a gripping rib according to the second embodiment of the present invention, and FIG. 10B is an enlarged perspective view showing the gripping rib. FIG. 11 is a front view showing a plastic bottle according to a third embodiment of the present invention. FIG. 12 is a perspective view showing a plastic bottle according to a third embodiment of the present invention. FIG. 13 is a plan view showing a plastic bottle according to a third embodiment of the present invention. FIG. 14 is a view showing a state in which a label is pasted on a plastic bottle according to a third embodiment of the present invention. FIG. 15 is an enlarged perspective view showing a shoulder portion of a plastic bottle according to a third embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 6 (a) and 6 (b) are views showing a first embodiment of the present invention.

  First, an outline of a plastic bottle according to the present embodiment will be described with reference to FIGS. 1 to 6A and 6B.

  As will be described later, the plastic bottle 10 can be produced by biaxially stretching blow-molding a preform. Such a plastic bottle 10 has an internal volume of 1 l or less (1000 cc or less), a mouth part 11, a shoulder part 12 provided below the mouth part 11, and a body part 20 provided below the shoulder part 12. The bottom part 30 provided below the trunk | drum 20 is provided.

  Among these, the trunk | drum 20 has the four side surfaces 21 which become the mutually same shape, and consists of a square cylinder shape as a whole. In addition, a flat body boundary surface 22 is formed between adjacent side surfaces 21.

  Moreover, the four side surfaces 21 of the trunk | drum 20 are divided into the upper area | region 21a and the lower area | region 21b through the side surface horizontal concave rib 24a drawn inward (inward of the bottle 10). Each body boundary surface 22 is also divided into an upper region 22a and a lower region 22b via a boundary surface horizontal concave rib 24b that is drawn inward (inward of the bottle 10).

  Among these, the horizontal concave rib 24 is comprised by the side surface horizontal concave rib 24a and the boundary surface horizontal concave rib 24b.

  A plurality of panel portions 23 are provided in the upper region 21a and the lower region 21b of each side surface 21 of the trunk portion 20, and the panel portion 23 adds to the plastic bottle 10 when the plastic bottle 10 is expanded and decompressed. Absorbing pressure.

  Furthermore, as shown in FIG. 5, the bottom portion 30 includes a peripheral portion 31 and a central portion 32 that is located at the center of the peripheral portion 31 and is lifted upward from the peripheral portion 31. An intermediate portion 33 extending in a circumferential shape is interposed between the intermediate portion 31 and the intermediate portion 31.

  Next, the configuration of the shoulder 12 of the plastic bottle 10 will be described in detail with reference to FIGS.

  As shown in FIG. 1, the shoulder portion 12 of the plastic bottle 10 is formed between the mouth portion 11 and the body portion 20 and has four shoulder inclined surfaces 12A, and has a truncated quadrangular rectangular shape as a whole. Have

  A shoulder boundary surface 12B is formed between the shoulder inclined surfaces 12A. Of these, each shoulder inclined surface 12 </ b> A is formed corresponding to the side surface 21 of the trunk portion 20, and each shoulder boundary surface 12 </ b> B is formed corresponding to the trunk portion boundary surface 22 of the trunk portion 20.

  Each shoulder inclined surface 12A is provided with a plurality of, for example, five elongated ridges 16 that protrude outward and have a triangular cross section, and each shoulder boundary surface 12B protrudes inward and has a triangular cross section. An elongated valley portion 15 having the shape is provided. A plurality of V-shaped reinforcing ribs 43 are provided in the shoulder boundary surfaces 12B along the vertical direction, and the buckling strength of the shoulder boundary surfaces 12B can be increased by the V-shaped reinforcing ribs 43. it can.

  By the way, the five elongated ridges 16 formed on each shoulder inclined surface 12A and the elongated valleys 15 formed on each shoulder boundary surface 12B are radially arranged as a whole on the plane (FIG. 4). reference).

  An annular inclined surface 13 is formed between the shoulder portion 12 and the body portion 20 so as to extend in the horizontal direction and incline downward toward the outside, and five are provided on each shoulder inclined surface 12A. The elongated crest 16 is on the same plane as the annular inclined surface 13 (is flush). Further, the elongated valley 15 provided on each shoulder boundary surface 12B is drawn inward with the annular inclined surface 13 as a reference.

  Further, a protruding rib 42 protruding outward is provided at a position corresponding to the shoulder boundary surface 12 </ b> B in the annular inclined surface 13, and the buckling strength of the annular inclined surface 13 can be increased by the protruding rib 42.

  In this way, the horizontal concave ribs 24 formed of the side surface horizontal concave ribs 24a provided on the side surfaces 21 and the boundary surface horizontal concave ribs 24b provided on the respective body surface boundary surfaces 22 are formed on the body portion 20. Among these, the side surface horizontal concave rib 24 a of each side surface 21 is provided with a gripping portion 35 including an uneven horizontal groove 37.

  The grip portion 35 is disposed so as to be substantially contained in the side horizontal concave rib 24a. In this case, the side horizontal concave rib 24a forms a curved surface such that the center portion in the left-right direction is drawn inward, and the left side portion and the right side portion protrude outward.

  The grip 35 has a pair of horizontal grooves 37, 37 extending in the horizontal direction, and has an uneven shape so that it can be easily gripped as a whole.

  In this way, each side horizontal concave rib 24a forms a curved surface with the central portion in the left-right direction pulled inward as a whole, and a gripping portion 35 having an uneven shape is provided on the side horizontal concave rib 24a having this curved surface. ing. For this reason, the plastic bottle 10 can be easily gripped through the gripping portions 35 of the side horizontal concave ribs 24 a provided on the pair of side surfaces 21 facing each other among the four side surfaces 21.

  Moreover, since each grip part 35 is provided so that it may substantially fit in the corresponding side surface horizontal concave rib 24a, each grip part 35 does not stand out of the trunk | drum 20. As shown in FIG.

  In other words, a technology has been developed for gripping a plastic bottle by providing a gripping portion in a horizontal concave rib on the side surface of the plastic bottle. However, in the case of a plastic bottle having an internal volume of 1.5 to 2 liters, the gripping portion is easily gripped. It is common to make this gripping part large so that it is possible. In this case, since the gripping portion protrudes and extends upward or downward from the side horizontal concave rib, the gripping portion becomes conspicuous in terms of the appearance of the body portion, which is not preferable in appearance.

  On the other hand, in the case of a plastic bottle of 1 liter or less, there are few bottles provided with a gripping portion in the horizontal concave rib, and it is difficult to grip such as being difficult to hold when pouring the contents.

  On the other hand, according to the present invention, each gripping part 35 is provided so as to fit within the corresponding side horizontal concave rib 24 a, so that each gripping part 35 does not stand out outward of the body part 20.

  By the way, each of the four body boundary surfaces 22 located between the side surfaces 21 of the plastic bottle 10 is provided with gripping ribs 40 protruding outward. In this case, the plastic bottle 10 can be gripped by gripping the gripping ribs 40 provided on the pair of opposite body boundary surfaces 22.

  In other words, each side surface 21 of the plastic bottle 10 is provided with a gripping portion 35 formed of an uneven horizontal rib 37. In addition to the gripping portion 35, the plastic bottle 10 is gripped by the body boundary surface 22. A gripping rib 40 is provided.

  As shown in FIGS. 6 (a) and 6 (b), three gripping ribs 40 are provided in the boundary surface horizontal concave ribs 24b in each body boundary surface 22, and each gripping rib 40 extends in the vertical direction. Yes.

  As described above, the three gripping ribs 40 are provided in the boundary surface horizontal concave ribs 24b in each of the body boundary surfaces 22, and the side horizontal concave ribs 24a provided in the side surfaces 21 are as described above. A grip portion 35 made up of uneven horizontal ribs 37 is provided.

  Therefore, the user can grip the plastic bottle 10 by gripping either the grip portion 35 on the side surface 21 or the grip rib 40 on the body boundary surface 22 provided on the same horizontal plane. Therefore, the user can grip the grip rib 40 with the same feeling as when gripping the grip portion 35 of the side surface 21 without feeling uncomfortable. The uneven shape formed in the vicinity of the gripping rib 40 also has a gripping function like the gripping rib 40.

  In addition, since the gripping ribs 40 provided on the body boundary surfaces 22 extend in the vertical direction, the buckling strength at the body boundary surfaces 22 can be improved.

  That is, with the weight reduction of the plastic bottle 10 generally, the thickness of the body boundary surface 22 that becomes a corner portion becomes thinner, and the strength of the body boundary surface 22 is likely to decrease. For example, in the case of the plastic bottle 10 obtained by blow molding, the thickness of the body boundary surface 22 with respect to the side surface 21 is reduced to about 0.71 to 0.87.

  According to the present embodiment, by providing the gripping ribs 40 extending in the vertical direction on the body boundary surface 22 which is thin and easily deteriorated in strength, the buckling strength at the body boundary surface 22 can be increased. it can. Further, by providing the gripping rib 40 on the body boundary surface 22 that becomes the corner portion, the gripping rib 40 functions as a resistance at the time of blow molding, so that the preform is not simply stretched and thinned. , The thickness can be increased accordingly.

  Such a plastic bottle 10 is formed of a thin wall, and can be manufactured by biaxially stretching blow-molding a preform manufactured by injection molding of a synthetic resin material.

In addition, it is preferable to use a thermoplastic resin, especially PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate) as a material of the preform, that is, the plastic bottle 10.

  The plastic bottle 10 can also be formed as a multilayer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer has gas barrier properties and light shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). A multilayer bottle having gas barrier properties and light shielding properties may be formed by extrusion molding a preform composed of three or more layers as the resin (intermediate layer), and then blow molding. Such an intermediate layer is preferably provided in at least the body 20 of the plastic bottle 10. Further, it is preferable to provide an intermediate layer in the region of the bottom portion 30 excluding the central portion of the bottom portion 30. This is because this portion may cause delamination (delamination) when subjected to an impact such as a case dropping. In order to have gas barrier properties and light shielding properties, a blend bottle in which thermoplastic resins are blended may be formed as well as multilayers.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, the plastic bottle 10 is filled with a content liquid such as green tea or coffee, and then sealed.

  In this case, the content liquid is filled into the plastic bottle 10 in a state where the central portion of the bottom 30 of the plastic bottle 10 is pushed up by a push rod (not shown).

  Next, after the mouth portion 11 is sealed with a cap (not shown), a label such as a shrink film is attached around the body portion 20.

  The plastic bottles 10 filled with the content liquid are stacked and stored or transported. For this reason, a large load may be applied to the plastic bottle 10 filled with the content liquid in the vertical direction during storage or transportation.

  According to the present invention, five elongated ridges 16 are provided on each shoulder inclined surface 12A of the shoulder 12, and the elongated valley 15 is provided on each shoulder boundary surface 12B. Since the elongated valley portions 15 are formed to have a radial shape on a plane, the elongated mountain portions 16 and the elongated valley portions 15 function as reinforcing ribs with respect to the load applied to the shoulder portion 12. For this reason, the load of the up-down direction added to the shoulder part 12 can be received reliably by these elongate peak part 16 and the elongate valley part 15, and the intensity | strength along the up-down direction of the shoulder part 12 can be improved.

  In use, the plastic bottle 10 is gripped and the cap is removed from the mouth portion 11. In this case, the plastic bottle 10 can be easily grasped via the grasping portion 35 having the concavo-convex shape in the side horizontal concave rib 24 a provided on the pair of opposing side surfaces 21 among the four side surfaces 21. Furthermore, since each grip part 35 is provided so that it may fit in the corresponding side surface horizontal concave rib 24a, each grip part 35 does not stand out of the trunk | drum 20. As shown in FIG.

  Furthermore, in addition to the gripping portions 35 provided on the side surfaces 21, gripping ribs 40 provided on the pair of opposing body boundary surfaces 22 are gripped by providing the gripping ribs 40 on the body boundary surfaces 22. You can also

  In the above-described embodiment, the example in which the grip ribs 40 are provided on the four body boundary surfaces 22 has been described. However, the present invention is not limited thereto, and the grip ribs 40 may be provided only on the pair of opposing body boundary surfaces 22. Good.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 10A and 10B.

  The second embodiment shown in FIGS. 7 to 10 (a) and 10 (b) is different only in the configuration of the gripping portion made of a horizontal groove and the configuration of the gripping rib, and the other configurations are the same as those in FIGS. a) It is substantially the same as the first embodiment shown in (b).

  In the second embodiment shown in FIGS. 7 to 10 (a) and 10 (b), the same parts as those in the first embodiment shown in FIGS. 1 to 6 (a) and 6 (b) are denoted by the same reference numerals. Detailed description will be omitted.

  As shown in FIGS. 7 to 10 (a) and 10 (b), the body 20 of the plastic bottle 10 is provided with a horizontal concave rib 24 composed of a side horizontal concave rib 24a and a boundary horizontal concave rib 24b. Additional horizontal concave ribs 24A and 24B are provided above and below the horizontal concave rib 24, respectively.

  Each of the additional horizontal concave ribs 24 </ b> A and 24 </ b> B has substantially the same configuration as the horizontal concave rib 24, and the horizontal horizontal concave ribs 24 a provided on each side surface 21 and the boundary surface horizontal concave shape provided on each body boundary surface 22. It consists of ribs 24b. Each of the boundary horizontal ribs 24b of the horizontal concave rib 24 and the additional horizontal concave ribs 24A and 24B has a curved surface protruding outward, and each side horizontal concave rib 24a has a pair of adjacent horizontal horizontal ribs 24b of the boundary. , 24b has a curved surface protruding inward, and the rigidity of the body portion 20 can be improved by the additional horizontal concave ribs 24A, 24B.

  Each side surface 21 of the plastic bottle 10 is provided with a horizontal groove 37 between the horizontal concave rib 24 and the upper additional horizontal concave rib 24A, and the horizontal concave rib 24 and the additional horizontal concave rib 24B on the lower side are provided. A horizontal groove 37 is provided therebetween, and a grip portion 35 is formed on each side surface 21 by the pair of horizontal grooves 37.

  Furthermore, the body boundary surface 22 located between the side surfaces 21 has three grips extending in the vertical direction and projecting outward between the horizontal concave rib 24 and the upper additional horizontal concave rib 24A. Ribs 40a are provided. Each body boundary surface 22 is provided with three gripping ribs 40b extending in the vertical direction and projecting outward between the horizontal concave ribs 24 and the lower additional horizontal concave ribs 24B.

  Therefore, a total of six gripping ribs 40 a and 40 b are provided on each body boundary surface 22, three on each of the upper side and the lower side of the horizontal concave rib 24. The uneven shape formed in the vicinity of the gripping ribs 40a and 40b also has a gripping function similarly to the gripping ribs 40a and 40b.

  According to the present embodiment, the user can grip the plastic bottle 10 by gripping the grip ribs 40a and 40b provided on the pair of opposing body boundary surfaces 22.

  Since a total of six gripping ribs 40a and 40b are provided in the vicinity of the horizontal concave ribs 24 on each body boundary surface 22, the buckling strength at each body boundary surface 22 is reduced in thickness and easily reduced in strength. It can be surely increased.

Third Embodiment Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. 11 to 15 are views showing a third embodiment of the present invention.

  First, the outline of the plastic bottle according to the present embodiment will be described with reference to FIGS.

  The plastic bottle 10 includes a mouth portion 11, a shoulder portion 12 provided below the mouth portion 11, a trunk portion 20 provided below the shoulder portion 12, and a bottom portion 30 provided below the trunk portion 20. Yes.

  Among these, the trunk | drum 20 has the four side surfaces 21 which become the mutually same shape, and consists of a square cylinder shape as a whole. In addition, a flat body boundary surface 22 is formed between adjacent side surfaces 21.

  Moreover, the four side surfaces 21 of the trunk | drum 20 are divided into the upper area | region 21a and the lower area | region 21b through the side surface horizontal concave rib 24a drawn inward (inward of the bottle 10). Each body boundary surface 22 is also divided into an upper region 22a and a lower region 22b via a boundary surface horizontal concave rib 24b that is drawn inward (inward of the bottle 10).

  Among these, the horizontal concave rib 24 is comprised by the side surface horizontal concave rib 24a and the boundary surface horizontal concave rib 24b.

  Further, a flat panel portion 23 is provided in each of the upper region 21a and the lower region 21b of each side surface 21 of the trunk portion 20, and the panel portion 23 allows the plastic bottle 10 to be inflated and decompressed. Absorbs the applied pressure.

  Next, the configuration of the shoulder 12 of the plastic bottle 10 will be described in detail with reference to FIGS. 11, 12, and 15.

  As shown in FIGS. 11, 12 and 15, the shoulder portion 12 of the plastic bottle 10 is formed between the mouth portion 11 and the trunk portion 20, and has four shoulder inclined surfaces 12 </ b> A. As a truncated square conical shape.

  A shoulder boundary surface 12B is formed between the shoulder inclined surfaces 12A. Of these, each shoulder inclined surface 12 </ b> A is formed corresponding to the side surface 21 of the trunk portion 20, and each shoulder boundary surface 12 </ b> B is formed corresponding to the trunk portion boundary surface 22 of the trunk portion 20.

  Each shoulder inclined surface 12A is provided with a plurality of, for example, five elongated ridges 16 that protrude outward and have a triangular cross section, and each shoulder boundary surface 12B protrudes inward and has a triangular cross section. An elongated valley portion 15 having the shape is provided.

  By the way, the five elongated crests 16 formed on each shoulder inclined surface 12A and the elongated troughs 15 formed on each shoulder boundary surface 12B are arranged radially on the plane (FIG. 13). reference).

  Further, an annular inclined surface 13 extending in the horizontal direction and inclined downward is formed between the shoulder portion 12 and the trunk portion 20, and the five inclined surfaces 12A provided on each shoulder inclined surface 12A. The elongated crest 16 is on the same plane as the annular inclined surface 13 (is flush). Further, the elongated valley 15 provided on each shoulder boundary surface 12B is drawn inward with the annular inclined surface 13 as a reference.

  Further, as described above, the side surface horizontal concave ribs 24 a are formed on each side surface 21, and the grip portion 35 including the uneven horizontal groove 37 is provided in the side surface horizontal concave rib 24 a.

  Furthermore, each body boundary surface 22 is formed with a boundary surface horizontal concave rib 24b, and three grip ribs 40 extending in the vertical direction and projecting outward are provided on the boundary surface horizontal concave rib 24b. .

  The user can easily grip the plastic bottle 10 by gripping the grip ribs 40 provided on the pair of opposing body boundary surfaces 22. The uneven shape formed in the vicinity of the gripping rib 40 also has a gripping function like the gripping rib 40.

  Furthermore, since the three horizontal holding ribs 40b extending in the vertical direction and projecting outward are provided on the boundary surface horizontal concave ribs 24b of the body boundary surfaces 22, the thickness is thin and the strength tends to decrease. The buckling strength at the body boundary surface 22 can be reliably increased.

DESCRIPTION OF SYMBOLS 10 Plastic bottle 11 Mouth part 12 Shoulder part 12A Shoulder inclined surface 12B Shoulder boundary surface 13 Annular inclined surface 15 Elongated valley part 16 Elongated mountain part 20 Trunk part 21 Side surface 21a Upper area | region 21b Lower area | region 22 Boundary surface 23 Panel part 24 horizontal concave rib 24A additional horizontal concave rib 24B additional horizontal concave rib 24a side horizontal concave rib 24b boundary horizontal concave rib 30 bottom 35 gripping portion 37 horizontal groove 40 gripping ribs 40a and 40b gripping rib

Claims (2)

In plastic bottles,
A cylindrical mouth,
A rectangular tubular body,
A shoulder disposed between the mouth and the torso;
A bottom portion below the trunk,
The torso has four sides and a torso interface located between each side,
Of each body boundary surface, at least one pair of body surface boundary surfaces facing each other is provided with three gripping ribs that protrude outward and are arranged in the horizontal direction . Each gripping rib extends in the vertical direction and faces each other. three gripping ribs which are respectively formed in a pair of barrel boundary surface is Do and graspable to Ri,
A horizontal concave rib comprising a side horizontal concave rib provided on each side of the trunk and a boundary horizontal concave rib provided on each trunk boundary is provided,
Provide a concave and convex gripping part on the side horizontal concave rib on each side,
Each gripping rib plastic bottles, wherein Rukoto fit in the boundary surface horizontal concave inner rib.   The plastic bottle according to claim 1, wherein gripping ribs projecting outward are provided on all four body boundary surfaces.

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