JP7223355B2 - plastic bottle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a plastic bottle that mainly contains liquid such as food and drink.

In recent years, plastic bottles have become common as bottles for containing liquids such as food and drink, and such plastic bottles are loaded after containing liquids.

A plastic bottle containing such a content liquid is required to be light in weight as a whole. In addition, generally, after a plastic bottle is filled with liquid, the specific gravity of the liquid changes, and the liquid absorbs oxygen present in the empty space of the plastic bottle, resulting in a phenomenon that the inside of the bottle is decompressed. Are known. However, when the weight of the plastic bottle is reduced, the thickness of the plastic bottle is also reduced, so that the plastic bottle is likely to be deformed when such pressure reduction occurs.

Japanese Patent Application Laid-Open No. 2002-193229 JP 2003-285814 A

On the other hand, there is also known a technique of absorbing the reduced pressure inside the plastic bottle by providing a reduced pressure absorption panel on the body of the plastic bottle (Patent Document 1). However, when such a vacuum absorption panel is provided, there is a problem that the design of the plastic bottle is deteriorated.

Also known is a plastic bottle in which circumferential ribs are arranged at equal intervals on the body (Patent Document 2). It is difficult. On the other hand, enlarging the circumferential rib is also conceivable, but in this case, there is a risk that the design of the plastic bottle will deteriorate.

In general, conventional plastic bottles are sold as commercial products after being filled with contents and then attached with various types of labels indicating the contents and the like. Plastic bottles with such labels are produced by loading a cylindrical heat-shrinkable film label (shrink label) onto the plastic bottle and then heat-shrinking it, or by winding a resin film (roll label) around the plastic bottle and then removing the edge of the resin film. It is manufactured by gluing or fusing parts.

However, for example, when a shrink label is provided on a plastic bottle, although the shrink label can follow the shape of the plastic bottle, there is a problem that the manufacturing cost of the plastic bottle increases. Therefore, it is desired to use a roll label that can reduce the manufacturing cost of plastic bottles. On the other hand, roll labels are inexpensive, but they require that the body of the plastic bottle be provided with an elongated area in order to adhere or fuse the ends of the resin film. Therefore, when the body of the plastic bottle has a complicated shape, there is a problem that the resin film cannot be adhered or fused to the plastic bottle.

The present invention has been made in consideration of such points, and even if the weight of the plastic bottle is reduced, it is possible to absorb the pressure reduction inside the bottle and to easily attach a desired label. To provide a plastic bottle capable of suppressing deterioration of designability.

The present invention provides a plastic bottle to which a label is attached, comprising: a mouth portion; a shoulder portion provided below the mouth portion; a body portion provided below the shoulder portion; a plurality of concave grooves extending in the vertical direction and each having a rib function are arranged in the circumferential direction in the body portion, and the grooves adjacent to each other in the circumferential direction are provided with a plurality of concave grooves. , a plastic bottle characterized in that a circumferential wall is formed, each having a deformation-inducing function, and each said recessed groove fits within an area in which said label is placed.

The present invention is a plastic bottle characterized in that the width of each of the concave grooves is smaller than the maximum depth of each of the concave grooves.

The present invention is the plastic bottle, wherein the maximum depth of the concave groove is 0.5 mm or more and 4 mm or less.

The present invention is a plastic bottle, wherein the height of the concave groove is 45 mm or more and 160 mm or less.

The present invention is the plastic bottle, wherein the width of the concave groove is 3 mm or more and 20 mm or less.

The plastic bottle according to the present invention is characterized in that the body portion is formed with an affixing area to which an adhesive material for affixing the label is affixed.

The present invention is the plastic bottle, wherein the width of the recessed groove is smaller than the width of the attachment area.

The present invention is the plastic bottle, wherein the pasting area is formed in an area where the concave groove is not formed.

The present invention is the plastic bottle, wherein the region of the body portion where the concave groove is not formed has a uniform diameter from just below the shoulder portion to just above the bottom portion.

The present invention is a plastic bottle characterized in that the concave grooves are provided so as to be evenly distributed at predetermined angles in the circumferential direction.

According to the present invention, a plurality of concave grooves extending in the vertical direction and each having a rib function are arranged in the circumferential direction in the trunk portion, and the concave grooves that are adjacent to each other in the circumferential direction are provided with respective deformation-inducing grooves. A functional circumferential wall is formed and each recessed groove fits within an area in which a label is to be placed. Therefore, even if the weight of the plastic bottle is reduced, the decompression inside the bottle can be absorbed, and a desired label can be easily affixed, thereby suppressing deterioration of the design. can.

1 is a front view showing a plastic bottle according to one embodiment of the present invention; FIG. FIG. 2 is a top view showing a plastic bottle according to one embodiment of the present invention; FIG. 3 is a bottom view showing a plastic bottle according to one embodiment of the present invention; FIG. 4 is a horizontal cross-sectional view (cross-sectional view taken along line IV-IV in FIG. 1) showing a concave groove in the body. 5(a) and 5(b) are horizontal cross-sectional views of the body before and after depressurizing the inside of the plastic bottle, respectively. 6 is a view corresponding to FIG. 4 and a cross-sectional view showing a modification of the plastic bottle according to the embodiment of the present invention; FIG. FIG. 7 is a front view showing a plastic bottle as a comparative example;

An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 are diagrams showing one embodiment of the present invention.

First, the outline of the plastic bottle according to the present embodiment will be described with reference to FIGS. 1 to 4. FIG. In this specification, the terms "upper" and "lower" respectively refer to the upper and lower sides when the plastic bottle 10 is erected (FIG. 1).

The plastic bottle 10 shown in FIGS. 1 to 4 is produced by preparing a preform obtained by injection molding and subjecting this preform to biaxial stretch blow molding.
Such a plastic bottle 10 is a lightweight bottle having a volume of, for example, 150 ml or more and 750 ml or less. This plastic bottle 10 is a panelless bottle, that is, a body portion 20 (to be described later) of the plastic bottle 10 is not provided with a panel that absorbs the pressure reduction inside the plastic bottle 10 and deforms, such as a pressure reduction absorption panel.

As shown in FIG. 1, the plastic bottle 10 includes a mouth portion 11, a shoulder portion 12 provided below the mouth portion 11, a body portion 20 provided below the shoulder portion 12, and a body portion 20 provided below the body portion 20. and a bottom portion 30 . A label La is provided on the outside of the plastic bottle 10 . In addition, in FIG. 1, the label La is indicated by a dashed line in order to clarify the recessed groove 21, which will be described later.

1 and 2, the mouth portion 11 has a threaded portion 14 to which a cap 18 is screwed and a flange portion 17 provided below the threaded portion 14. As shown in FIGS. In addition, the shape of the mouth portion 11 may be a conventionally known shape.

As shown in FIG. 1, the neck portion 13 is located between the flange portion 17 and the shoulder portion 12 and has a substantially cylindrical shape with a substantially uniform diameter. The shoulder portion 12 is positioned between the neck portion 13 and the body portion 20 and has a shape whose diameter gradually increases from the neck portion 13 side toward the body portion 20 side. The shoulder portion 12 has a circular horizontal cross section and a curved vertical cross section that bulges from the inside to the outside.

As shown in FIGS. 1 to 4, the body portion 20 has a cylindrical shape as a whole, and has a plurality of concave grooves 21 extending vertically and having a rib function on the circumference of the body portion 20 . are arranged in the same direction. This concave groove 21 mainly increases the strength of the periphery of the central portion of the body portion 20, which is a portion that is easily deformed, and serves to prevent this portion from being depressed in the horizontal direction.

Further, each recessed groove 21 is provided so as to fit within the region where the label La is arranged in the vertical direction. That is, as shown in FIG. 1, when the label La is attached to the plastic bottle 10, each concave groove 21 is covered with the label La so that each concave groove 21 is difficult to see and is inconspicuous. ing.

In the present embodiment, as shown in FIG. 4, the concave grooves 21 are provided so as to be evenly distributed by a predetermined angle in the circumferential direction. , five concave grooves 21 are provided. As a result, as will be described later, the rib function can be evenly applied along the circumferential direction to the body portion 20 of the plastic bottle 10, and the central portion of the body portion 20, which is a portion that is easily deformed, can be easily deformed. Strength can be increased.

Further, as shown in FIG. 1, these concave grooves 21 have a substantially elliptical shape when viewed from the front. Here, the term “substantially elliptical shape” includes not only a strictly elliptical shape, but also a shape approximated to an elliptical shape by continuously connecting a plurality of minute circular arcs. Further, as shown in FIG. 4, each concave groove 21 is recessed radially inward and has a substantially arc shape in a horizontal cross-sectional view. The depth of each concave groove 21 is maximum at the central portion in the width direction of the concave groove 21 (the circumferential direction of the plastic bottle 10). The maximum depth D of this concave groove 21 can be 0.5 mm or more and 4 mm or less, and can be 1 mm as an example. In addition, since the depth of the recessed groove 21 is not too large, it is possible to prevent the capacity of the plastic bottle 10 from decreasing.

Moreover, the width W1 of each concave groove 21 is smaller than the maximum depth D of the concave groove 21, respectively. Thereby, when the inside of the plastic bottle 10 is decompressed, it is possible to effectively suppress the radially inward deformation of the concave groove 21 . Therefore, the strength around the central portion of the trunk portion 20 can be effectively increased. Further, as will be described later, the width W1 of the recessed groove 21 is smaller than the width W2 of the attachment area 23 described later. The width W1 of such concave groove 21 may be, for example, 3 mm or more and 20 mm or less. By setting the width W1 of the concave groove 21 to 3 mm or more, it is possible to improve the shapeability during blow molding. Further, by setting the width W1 of the concave groove 21 to 20 mm or less, it is possible to effectively suppress radial deformation of the concave groove 21 when the inside of the plastic bottle 10 is decompressed. Here, in this specification, the width W1 of the concave groove 21 means the length of the concave groove 21 along the circumferential direction.

Also, the height H of the concave groove 21 may be, for example, 45 mm or more and 160 mm or less. By setting the height H of the concave groove 21 to 45 mm or more, the rib function of the concave groove 21 can be effectively exhibited. Further, by setting the height H of the concave grooves 21 to 160 mm or less, it is possible to improve the shapeability during blow molding.

On the other hand, in the trunk portion 20, circumferential walls 22 each having a deformation inducing function are formed between concave grooves 21 adjacent to each other in the circumferential direction. That is, the area where the recessed groove 21 is not formed consists of the circumferential wall 22 . Thus, the body portion 20 is composed only of each concave groove 21 and the circumferential wall 22 . When the inside of the plastic bottle 10 is decompressed, the circumferential wall 22 deforms inward in the radial direction of the plastic bottle 10 to exhibit the function of absorbing the decompression.

A region (circumferential wall 22 ) in which the recessed groove 21 is not formed has a uniform diameter from just below the shoulder portion 12 to just above the bottom portion 30 . As a result, for example, when the plastic bottle 10 is stored sideways in the vending machine, it can be brought into contact with other adjacent plastic bottles 10 over a wide area, so that the body 20 does not deform in the vending machine. can be prevented.

Further, the body portion 20 is formed with a sticking region 23 to which an adhesive material for sticking the label La is adhered. In this embodiment, the sticking area 23 is formed in the area where the concave groove 21 is not formed, that is, the circumferential wall 22 . As a result, it is possible to prevent the problem that the adhesive material enters the recessed groove 21 and makes it difficult to attach the label La with the adhesive material. Further, as described above, the width W1 of the recessed groove 21 is smaller than the width W2 of the attachment area 23 . Thereby, even when the sticking area 23 is formed in a portion overlapping the recessed groove 21 , at least part of the sticking area 23 can be formed on the circumferential wall 22 . Therefore, the label La can be affixed to the body 20 of the plastic bottle 10 even if the affixing area 23 is formed in a portion overlapping the concave groove 21 and the adhesive material enters the concave groove 21 . Here, in this specification, the width W2 of the sticking area 23 refers to the length of the sticking area 23 along the circumferential direction.

On the other hand, as shown in FIGS. 1 and 3 , the bottom portion 30 includes a circular recess 31 located in the center, a radial panel 32 provided in the recess 31 and extending radially, and a grounding panel 32 provided around the recess 31 . a portion 33; In FIG. 3, the number of radial panels 32 is five, but the number is not limited to this, and may be set in the range of, for example, four to eleven. At this time, the number of radial panels 32 is preferably an odd number. By arranging the radial panels 32 in this manner, the strength of the bottom portion 30 is increased, and deformation of the bottom portion 30 is less likely to occur. The shape of the bottom portion 30 is also not particularly limited, and may have a conventionally known bottom portion shape (for example, a petaloid bottom shape, a round bottom shape, or the like).

Also, the thickness of the plastic bottle 10 at the circumferential wall 22 of the body 20 is not limited to this, but can be reduced to, for example, about 50 μm or more and 350 μm or less. Furthermore, the weight of the plastic bottle 10 is also not limited to this, but can be 10 g or more and 26 g or less for the plastic bottle 10 having a volume of 500 ml. By reducing the wall thickness of the plastic bottle 10 in this manner, the weight of the plastic bottle 10 can be reduced.

Such a plastic bottle 10 can be produced by biaxially stretching blow molding a preform produced by injection molding a synthetic resin material. As the material for the preform, that is, the plastic bottle 10, it is preferable to use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), and PEN (polyethylene naphthalate).

The plastic bottle 10 can also be formed as a multi-layer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer is made of MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), PEN (polyethylene naphthalate), etc., with gas barrier properties and light shielding properties. A multi-layered bottle having gas barrier properties and light shielding properties may be formed by extrusion molding a preform comprising three or more layers as the resin (intermediate layer), followed by blow molding. It is preferable that such an intermediate layer is provided at least inside the body portion 20 of the plastic bottle 10 . In addition, it is preferable to provide an intermediate layer in a region of the bottom portion 30 excluding the central portion of the bottom portion 30 . This is because there is a risk of delamination (delamination) at this portion when receiving an impact such as when the case is dropped. In order to have gas barrier properties and light shielding properties, a blend bottle may be formed by blending thermoplastic resins in addition to forming a multi-layered bottle.

In addition, as described above, the plastic bottle 10 is a panelless bottle, and the body portion 20 of the plastic bottle 10 is not provided with a panel that absorbs the pressure reduction inside the plastic bottle 10 and deforms, such as a pressure reduction absorption panel. Therefore, the design of the plastic bottle 10 is enhanced. Also, it is easy to arrange the label La around the body portion 20 of the plastic bottle 10 .

Next, the label La will be explained.

The label La displays the contents and the like, and is attached to the outer surface of the plastic bottle 10 . This label La may be produced, for example, by forming a sheet-like film into a cylinder and bonding the ends of the cylinder together. The label La is attached to the plastic bottle 10 with an adhesive material applied to the attachment area 23 . As shown in FIGS. 2 to 4, the label La is provided over the entire circumference of the plastic bottle 10 so as to surround it, and has a substantially circular horizontal cross section.

In this case, the label La is provided so as to cover the body portion 20 of the plastic bottle 10 . However, the label La may be provided on the entire area or a partial area of the plastic bottle 10 other than the mouth portion 11 . For example, the label La may be provided to cover the shoulder portion 12 , body portion 20 and bottom portion 30 of the plastic bottle 10 excluding the mouth portion 11 and neck portion 13 . Alternatively, the label La may be provided so as to cover the shoulder portion 12 and the body portion 20 of the plastic bottle 10 . Furthermore, the number of labels La is not limited to one, and a plurality of labels may be provided.

Examples of labels La include roll labels, tack labels, and paper labels. Among these, it is preferable to use a roll label because of its high productivity. As the label La, for example, a shrink label or stretch label that does not use an adhesive material may be used.

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

First, an empty plastic bottle 10 is prepared, and the inside of this plastic bottle 10 is filled with a content liquid such as a beverage. Subsequently, the opening 11 is closed with a cap (not shown). After the plastic bottle 10 is closed, the inside of the plastic bottle 10 is decompressed because the specific gravity of the liquid content changes or the liquid content absorbs oxygen present in the empty space (headspace) of the plastic bottle 10. state. When negative pressure is generated inside the plastic bottle 10 in this manner, stress is generated inwardly of the plastic bottle 10 . Examples of such contents include tea drinks, sports drinks, coffee drinks, and the like.

On the other hand, in the present embodiment, a plurality of circumferential walls 22 having a deformation inducing function are formed on the trunk portion 20 . These circumferential walls 22 are deformed radially inwardly of the plastic bottle 10 when the inside of the plastic bottle 10 is depressurized, as shown in FIGS. Therefore, the circumferential wall 22 can absorb the reduced pressure of the plastic bottle 10 . FIG. 5(a) is a partially enlarged view of the concave groove 21 and the circumferential wall 22 before the inside of the plastic bottle 10 is decompressed, and FIG. 4 is a partially enlarged view of concave groove 21 and circumferential wall 22. FIG.

Further, a plurality of concave grooves 21 having a rib function are formed in the body portion 20 . As a result, even when the reduced pressure inside the plastic bottle 10 is absorbed, the concave groove 21 does not greatly dent inward. In particular, since the width W1 of each recessed groove 21 is smaller than the maximum depth D of each recessed groove 21, the recessed grooves 21 move radially inward when the pressure inside the plastic bottle 10 is reduced. Deformation can be effectively suppressed. Therefore, the strength around the central portion of the trunk portion 20 can be effectively increased. As a result, the rigidity of each recessed groove 21 can prevent the plastic bottle 10 from undergoing large deformation such as depression deformation, elliptical deformation, and bending deformation.

Since the circumferential wall 22 deforms inward in the radial direction of the plastic bottle 10 in this way, the pressure reduction of the plastic bottle 10 can be absorbed. On the other hand, due to the rigidity of the concave groove 21, the concave groove 21 does not greatly dent inward.

By the way, in such a plastic bottle 10, after filling the plastic bottle 10 with a content, a label indicating the content etc. is affixed to the bottle and sold as a product. In this case, the label La is adhered to the plastic bottle 10 by the adhesive material adhered to the application area 23 . Here, in the plastic bottle 10 , the sticking area 23 is formed in the area where the recessed groove 21 is not formed, ie, in the circumferential wall 22 . As a result, when the label La is attached to the plastic bottle 10, it is possible to prevent the adhesive material from entering the recessed groove 21, making it difficult to attach the label La. Further, since the width W1 of the recessed groove 21 is smaller than the width W2 of the sticking region 23, even if the sticking region 23 is formed in a portion overlapping the recessed groove 21, at least one of the sticking regions 23 is A section may be formed in the circumferential wall 22 . Therefore, the label La can be affixed to the body 20 of the plastic bottle 10 even if the affixing area 23 is formed in a portion overlapping the concave groove 21 and the adhesive material enters the concave groove 21 .

As described above, according to the present embodiment, the trunk portion 20 is provided with a plurality of concave grooves 21 extending in the vertical direction and each having a rib function. Circumferential walls 22 each having a deformation inducing function are formed between adjacent concave grooves 21 . As a result, when the inside of the plastic bottle 10 is decompressed, the circumferential wall 22 deforms inward in the radial direction of the plastic bottle 10 to absorb the decompression inside the plastic bottle 10 . Further, even when the circumferential wall 22 absorbs the pressure reduction inside the plastic bottle 10 , the rigidity of the concave groove 21 can prevent the plastic bottle 10 from being greatly deformed. Furthermore, each concave groove 21 is contained within the area where the label La is placed. Thereby, when the label La is attached to the plastic bottle 10, each concave groove 21 is covered with the label La, and each concave groove 21 is hard to see and can be made inconspicuous. Further, in the present embodiment, since the body portion 20 is composed only of the concave grooves 21 and the circumferential walls 22, there is no need to provide the body portion 20 with a vacuum absorbing panel. Therefore, the design of the plastic bottle 10 is not degraded by the vacuum absorption panel.

Further, in this embodiment, the width W1 of each recessed groove 21 is smaller than the maximum depth D of each recessed groove 21 . As a result, when the inside of the plastic bottle 10 is decompressed, it is possible to effectively suppress the radially inward deformation of the concave grooves 21 . Therefore, the strength around the central portion of the trunk portion 20 can be increased.

Further, in the present embodiment, the body portion 20 is formed with an attachment region 23 to which an adhesive material for attaching the label La is attached. Also, the sticking area 23 is formed in the area where the recessed groove 21 is not formed, that is, the circumferential wall 22 . As a result, it is possible to prevent the problem that the adhesive material enters the recessed groove 21 and makes it difficult to attach the label La with the adhesive material. Therefore, a highly productive roll label can be suitably used as the label La.

Further, in the present embodiment, width W1 of concave groove 21 is smaller than width W2 of attachment region 23 . Thereby, even when the sticking area 23 is formed in a portion overlapping the recessed groove 21 , at least part of the sticking area 23 can be formed on the circumferential wall 22 . Therefore, the label La can be affixed to the body 20 of the plastic bottle 10 even if the affixing area 23 is formed in a portion overlapping the concave groove 21 and the adhesive material enters the concave groove 21 .

Furthermore, in the present embodiment, the concave grooves 21 are provided so as to be evenly distributed by a predetermined angle when viewed from above and below. As a result, the rib function can be evenly applied along the circumferential direction to the body portion 20 of the plastic bottle 10, and the strength around the central portion of the body portion 20, which is a portion that is easily deformed, can be effectively increased. can be enhanced.

In addition, in the present embodiment, each concave groove 21 has a substantially arc shape in a horizontal cross-sectional view. However, it is not limited to this. For example, as shown in FIG. 6, each concave groove 21 has a first inclined surface 21a that is connected to the circumferential wall 22 and inclined radially along the circumferential direction in a horizontal cross-sectional view. It may have a second inclined surface 21b that is contiguous with 21a and inclined in the radial direction along the circumferential direction. In this case, the opening angle Ra of the first inclined surface 21a and the opening angle Rb of the second inclined surface 21b are different. As shown in FIG. 6, the opening angle Ra of the first inclined surface 21a and the opening angle Rb of the second inclined surface 21b are defined by the first inclined surface 21a or the second inclined surface 21b in the horizontal cross section. angle In this modification, the opening angle Ra is larger than the opening angle Rb. As a result, the formability during blow molding is improved, and even the recessed grooves 21 having a large maximum depth D can be easily formed.

Next, specific examples of the present invention will be described.

(Example)
First, a plastic bottle 10 having a capacity of 520 ml and having the configuration shown in FIGS. 1 to 4 was produced.

In this case, an 18-g PET single-layer preform was produced by injection molding, and a plastic bottle 10 with a capacity of 520 ml was produced by biaxially stretching blow-molding this preform.

The obtained plastic bottle 10 was filled with 500 ml of water and capped with a cap with a rubber stopper.

After that, air was extracted from the empty portion (head space) of the plastic bottle 10 using a syringe. Then, whether or not the plastic bottle 10 undergoes large deformation such as depression deformation, elliptical deformation, bending deformation, or the like was examined, and the amount of extracted air was measured (Table 1).

(Comparative example)
On the other hand, as a comparative example, a plastic bottle 110 with a capacity of 520 ml shown in FIG. 7 was produced. A plastic bottle 110 shown in FIG. 7 includes a mouth portion 111, a shoulder portion 112, a body portion 120, and a bottom portion 130, and the body portion 120 is not provided with a concave groove.

In this case, an 18-g PET single-layer preform was produced by injection molding, and a plastic bottle 100 with a capacity of 520 ml was produced by biaxially stretching blow-molding this preform.

The obtained plastic bottle 110 was filled with 500 ml of water and capped with a cap with a rubber stopper.

After that, air was extracted from the empty portion (headspace) of the plastic bottle 110 using a syringe. Then, it was examined whether or not the plastic bottle 110 was deformed, and the amount of the extracted air was measured (Table 1).

As shown in Table 1, in the plastic bottle 110 of the comparative example, when 10 ml of air was removed from the empty portion of the plastic bottle 110, the plastic bottle 110 was greatly deformed (oval deformation). On the other hand, in the plastic bottle 100 of the example, even when 10 ml of air is extracted from the empty portion of the plastic bottle 10, the plastic bottle 10 does not undergo a large deformation, and 20 ml of air is removed from the empty portion of the plastic bottle 10. could be extracted.

As described above, the plastic bottle 10 according to the example was not significantly deformed when the inside was decompressed, compared to the plastic bottle 110 according to the comparative example. Therefore, it is considered that the decompressed portion of the plastic bottle 10 can be effectively absorbed.

REFERENCE SIGNS LIST 10 plastic bottle 11 mouth 12 shoulder 20 body 21 concave groove 22 circumferential wall 23 attachment area 30 bottom 31 recess 32 radial panel La label

Claims (10)

in a plastic bottle,
a mouth;
a shoulder provided below the mouth;
a trunk provided below the shoulder;
a bottom provided below the body,
A plurality of concave grooves extending in the vertical direction and each having a rib function are provided side by side in the circumferential direction on the body,
Circumferential walls each having a deformation inducing function are formed between the concave grooves that are adjacent to each other in the circumferential direction,
A plastic bottle, wherein the circumferential wall is deformed so as to protrude inward in the radial direction of the plastic bottle when the inside of the plastic bottle is decompressed. 2. The plastic bottle according to claim 1, wherein the width of each recessed groove is smaller than the maximum depth of each recessed groove. 3. The plastic bottle according to claim 1, wherein the maximum depth of said concave groove is 0.5 mm or more and 4 mm or less. 4. The plastic bottle according to any one of claims 1 to 3, wherein the height of said concave groove is 45 mm or more and 160 mm or less. 5. The plastic bottle according to any one of claims 1 to 4, wherein the width of said concave groove is 3 mm or more and 20 mm or less. 6. The plastic bottle according to any one of claims 1 to 5, wherein the body portion is formed with an affixing area to which an adhesive material for affixing a label is adhered. 7. The plastic bottle according to claim 6, wherein the width of said concave groove is smaller than the width of said sticking area. 8. The plastic bottle according to claim 6, wherein said sticking area is formed in an area where said concave groove is not formed. 9. The plastic bottle according to any one of claims 1 to 8, wherein a region of said body portion in which said recessed groove is not formed has a uniform diameter from just below said shoulder portion to just above said bottom portion. . 10. The plastic bottle according to any one of claims 1 to 9, characterized in that said concave grooves are provided so as to be evenly distributed at predetermined angles in the circumferential direction.

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