JP7015474B2 - Plastic bottle - Google Patents

Description

The present invention mainly relates to a plastic bottle for containing a liquid such as food and drink.

Recently, plastic bottles have become common as bottles for containing the contents of foods and drinks, and such plastic bottles are loaded after containing the contents.

The plastic bottle that houses such a content liquid is required to be lightweight as a whole. In addition, in general, after filling a plastic bottle with the content liquid, the specific gravity of the content liquid changes, or the content liquid absorbs oxygen existing in the empty part of the plastic bottle, so that the inside of the bottle is depressurized. Are known. However, when the weight of the plastic bottle is reduced, the thickness of the plastic bottle is reduced, so that the plastic bottle is easily deformed when such a decompression occurs.

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

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

Further, it is known that the peripheral ribs are arranged at equal intervals on the body of the plastic bottle (Patent Document 2), but when the weight of such a plastic bottle is reduced, the decompression inside the bottle is sufficiently absorbed. That is difficult. On the other hand, it is conceivable to increase the size of the peripheral rib, but in this case, the design of the plastic bottle may be deteriorated.

Further, in general, in a conventional plastic bottle, after filling the plastic bottle with the contents, various types of labels indicating the contents and the like are attached and then sold as a product. A plastic bottle with such a label can be heat-shrinked after a tubular heat-shrinkable film label (shrink label) is loaded in the plastic bottle, or a resin film (roll label) is wrapped around the plastic bottle to form an edge of the resin film. Manufactured by bonding or fusing parts together.

However, for example, when a shrink label is provided on a plastic bottle, the shrink label can follow the shape of the plastic bottle, but there is a problem that the manufacturing cost of the plastic bottle is high. Therefore, it is desired to use a roll label that can reduce the manufacturing cost of a plastic bottle. On the other hand, although the roll label is inexpensive, it is necessary to provide a barrel-shaped region on the body of the plastic bottle in order to bond or fuse the ends of the resin film. Therefore, when the shape of the body of the plastic bottle is complicated, 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 a point, and even when the weight of a plastic bottle is reduced, the decompression inside the bottle can be absorbed and a desired label can be easily attached. It is an object of the present invention to provide a plastic bottle capable of suppressing deterioration of design.

The present invention provides a plastic bottle to which a label is attached, a mouth portion, a shoulder portion provided below the mouth portion, a body portion provided below the shoulder portion, and a body portion provided below the body portion. A plurality of concave grooves each extending in the vertical direction and having a rib function are provided side by side in the circumferential direction, and between the concave grooves adjacent to each other in the circumferential direction. , Each of which has a circumferential wall having a deformation-inducing function, and each of the concave grooves is a plastic bottle characterized in that it fits within the region where the label is arranged.

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

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

The present invention is a plastic bottle characterized in that the width of the concave groove is 3 mm or more and 20 mm or less.

The present invention is a plastic bottle characterized in that a sticking region to which an adhesive material for sticking the label is attached is formed on the body portion.

The present invention is a plastic bottle characterized in that the width of the concave groove is smaller than the width of the pasting area.

The present invention is a plastic bottle characterized in that the sticking region is formed in a region where the concave groove is not formed.

The present invention is a plastic bottle characterized in that the region of the body portion where the concave groove is not formed has a uniform diameter from directly below the shoulder portion to directly 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 each extending in the vertical direction and having a rib function are provided side by side in the circumferential direction on the body portion, and deformation is induced between the concave grooves adjacent to each other in the circumferential direction. A functional circumferential wall is formed and each concave groove fits within the area where the label is placed. Therefore, even when the weight of the plastic bottle is reduced, the decompression inside the bottle can be absorbed, the desired label can be easily attached, and the deterioration of the design can be suppressed. can.

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

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 5 are views showing an embodiment of the present invention.

First, the outline of the plastic bottle according to this embodiment will be described with reference to FIGS. 1 to 4. In the present specification, "upper" and "lower" mean upper and lower parts of the plastic bottle 10 in an upright state (FIG. 1), respectively.

The plastic bottle 10 shown in FIGS. 1 to 4 is produced by preparing a preform obtained by injection molding and subjecting the preform to biaxial stretch blow molding. Such a plastic bottle 10 is made of, for example, a lightweight bottle having a volume of 150 ml or more and 750 ml or less. The plastic bottle 10 is a panelless bottle, that is, the body 20 described later of the plastic bottle 10 is not provided with a decompression absorbing panel or a panel that absorbs the decompression inside the plastic bottle 10 and deforms.

As shown in FIG. 1, the plastic bottle 10 is provided with 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 below the body portion 20. It is provided with a bottom portion 30. Further, a label La is provided on the outside of the plastic bottle 10. In FIG. 1, the label La is shown by a broken line in order to clarify the concave groove 21 described later.

Of these, the mouth portion 11 has a screw portion 14 to which the cap 18 is screwed and a flange portion 17 provided below the screw portion 14, as shown in FIGS. 1 and 2. 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 having a substantially uniform diameter. Further, the shoulder portion 12 is located between the neck portion 13 and the body portion 20, and has a shape in which the diameter gradually increases from the neck portion 13 side to the body portion 20 side. The shoulder portion 12 has a circular shape in a horizontal cross section and a curved shape in a vertical cross section so as to bulge 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 a plurality of concave grooves 21 extending in the vertical direction and each having a rib function are circumferentially formed in the body portion 20. They are provided side by side in the direction. The concave groove 21 plays a role of increasing the strength around the central portion of the body portion 20, which is mainly a easily deformable portion, and preventing this portion from being recessed in the horizontal direction.

Further, each concave 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, and each concave groove 21 is configured to be invisible and inconspicuous. ing.

In the present embodiment, as shown in FIG. 4, the concave grooves 21 are provided so as to be evenly distributed at predetermined angles in the circumferential direction, specifically, 72 ° each. Is provided with five concave grooves 21. As a result, as will be described later, the rib function can be evenly applied to the body portion 20 of the plastic bottle 10 along the circumferential direction, and the periphery of the central portion of the body portion 20 which is easily deformed. The 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 substantially elliptical shape includes not only a strict elliptical shape but also a shape obtained by continuously connecting a plurality of minute arcs to approximate an elliptical shape. Further, as shown in FIG. 4, each concave groove 21 is recessed inward in the radial direction and has a substantially arc shape in a horizontal cross-sectional view. Each concave groove 21 has the maximum depth of the concave groove 21 in the central portion in the width direction (circumferential direction of the plastic bottle 10) of the concave groove 21. The maximum depth D of the concave groove 21 can be 0.5 mm or more and 4 mm or less, and can be 1 mm as an example. Since the depth of the concave groove 21 is not too large, it is possible to prevent the capacity of the plastic bottle 10 from decreasing.

Further, the width W1 of each concave groove 21 is smaller than the maximum depth D of each concave groove 21. This makes it possible to effectively prevent the concave groove 21 from being deformed inward in the radial direction when the inside of the plastic bottle 10 is depressurized. Therefore, the strength around the central portion of the body portion 20 can be effectively increased. Further, as will be described later, the width W1 of the concave groove 21 is smaller than the width W2 of the sticking region 23 which will be described later. The width W1 of such a 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, the shapeability at the time of blow molding can be improved. Further, by setting the width W1 of the concave groove 21 to 20 mm or less, it is possible to effectively suppress the deformation of the concave groove 21 in the radial direction when the inside of the plastic bottle 10 is depressurized. Here, in the present specification, the width W1 of the concave groove 21 means the length of the concave groove 21 along the circumferential direction.

Further, 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 groove 21 to 160 mm or less, the shapeability at the time of blow molding can be improved.

On the other hand, in the body portion 20, the circumferential walls 22 having deformation-inducing functions are formed between the concave grooves 21 adjacent to each other in the circumferential direction. That is, the region where the concave groove 21 is not formed is composed of the circumferential wall 22. As described above, the body portion 20 is composed of only each concave groove 21 and the circumferential wall 22. The circumferential wall 22 exerts a function of absorbing the reduced pressure by deforming inward in the radial direction of the plastic bottle 10 when the inside of the plastic bottle 10 is depressurized.

The region (circumferential wall 22) in which the concave groove 21 is not formed has a uniform diameter from directly below the shoulder portion 12 to directly 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 another adjacent plastic bottle 10 in a wide area, so that the body portion 20 is deformed in the vending machine. Can be prevented.

Further, a sticking region 23 to which an adhesive material for sticking the label La is attached is formed on the body portion 20. In the present embodiment, the sticking region 23 is formed in a region where the concave groove 21 is not formed, that is, in the circumferential wall 22. As a result, it is possible to prevent a problem that the adhesive material gets into the concave groove 21 and it becomes difficult to attach the label La due to the adhesive material. Further, as described above, the width W1 of the concave groove 21 is smaller than the width W2 of the sticking region 23. Thereby, even when the sticking area 23 is formed in the portion overlapping the concave groove 21, at least a part of the sticking area 23 can be formed on the circumferential wall 22. Therefore, even when the sticking region 23 is formed in the portion overlapping the concave groove 21 and the adhesive material enters the concave groove 21, the label La can be stuck to the body portion 20 of the plastic bottle 10. Here, in the present specification, the width W2 of the sticking area 23 means 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 has a circular recess 31 located in the center, a radial panel 32 provided in the recess 31, and a grounding surface provided around the recess 31. It has a unit 33. In FIG. 3, the number of radial panels 32 is 5, but the number is not limited to this, and may be set in the range of, for example, 4 or more and 11 or less. At this time, the number of radial panels 32 is preferably an odd number. By arranging the radial panel 32 in this way, the strength of the bottom portion 30 is increased, and the bottom portion 30 is less likely to be deformed. The shape of the bottom portion 30 is not particularly limited, and may have a conventionally known bottom shape (for example, a petaloid bottom shape, a round bottom shape, or the like).

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

Such a plastic bottle 10 can be manufactured by biaxial stretch blow molding of a preform manufactured by injection molding a synthetic resin material. As the material of 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).

Further, 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 provided with 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 multi-layer bottle having gas barrier property and light-shielding property may be formed by extrusion-molding a preform composed of three or more layers as the resin (intermediate layer) to be contained. It is preferable that such an intermediate layer is provided at least in the body 20 of the plastic bottle 10. Further, in the bottom portion 30, it is preferable to provide an intermediate layer in a region other than the central portion of the bottom portion 30. This is because this portion may cause delamination (delamination) when the case is dropped or otherwise impacted. 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 having multiple layers.

Further, as described above, the plastic bottle 10 is a panelless bottle, and the body 20 of the plastic bottle 10 is not provided with a decompression absorption panel or a panel that absorbs the decompression inside the plastic bottle 10 and deforms. Therefore, the design of the plastic bottle 10 is enhanced. Further, it is easy to arrange the label La around the body 20 of the plastic bottle 10.

Next, the label La will be described.

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 single-wafer-shaped film into a cylindrical shape and pasting the ends thereof. The label La is adhered to the plastic bottle 10 by the adhesive material adhered to the sticking area 23. As shown in FIGS. 2 to 4, the label La is provided over the entire circumferential direction so as to surround the plastic bottle 10, and has a substantially circular horizontal cross section.

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

Examples of the label La include roll labels, tack labels, paper labels, and the like. 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 a stretch label that does not use an adhesive material may be used.

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

First, an empty plastic bottle 10 is prepared, and the content liquid such as a beverage is filled in the plastic bottle 10. Subsequently, the mouth portion 11 is closed with a cap (not shown). After closing the plastic bottle 10, the specific gravity of the content liquid changes, and the content liquid absorbs oxygen existing in the empty portion (head space) of the plastic bottle 10, so that the inside of the plastic bottle 10 is depressurized. It will be in a state of being. When a negative pressure is generated inside the plastic bottle 10 in this way, stress is generated toward the inside of the plastic bottle 10. Examples of such contents include tea beverages, sports drinks, coffee beverages 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 body portion 20. When the inside of the plastic bottle 10 is depressurized, these circumferential walls 22 are deformed inward in the radial direction of the plastic bottle 10 as shown in FIGS. 5A-(b). Therefore, the circumferential wall 22 can absorb the decompression of the plastic bottle 10. 5A 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. 5B is a partially enlarged view after the inside of the plastic bottle 10 is decompressed. It is a partially enlarged view of the concave groove 21 and the circumferential wall 22.

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 largely dent inward. In particular, since the width W1 of each concave groove 21 is smaller than the maximum depth D of each concave groove 21, the concave groove 21 is radially inward when the inside of the plastic bottle 10 is depressurized. Deformation can be effectively suppressed. Therefore, the strength around the central portion of the body portion 20 can be effectively increased. As a result, due to the rigidity of each concave groove 21, it is possible to prevent the plastic bottle 10 from undergoing large deformation such as depression deformation, elliptical deformation, and bending deformation.

Since the circumferential wall 22 is deformed inward in the radial direction of the plastic bottle 10 in this way, the decompression 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 largely dent inward, so that the plastic bottle 10 does not undergo a large deformation in appearance.

By the way, in such a plastic bottle 10, after the plastic bottle 10 is filled with the contents, a label indicating the contents and the like is attached and then the product is sold. In this case, the label La is adhered to the plastic bottle 10 by the adhesive material adhered to the sticking area 23. Here, in the plastic bottle 10, the sticking region 23 is formed in a region where the concave groove 21 is not formed, that is, in the circumferential wall 22. As a result, when the label La is attached to the plastic bottle 10, it is possible to prevent a problem that the adhesive material gets into the concave groove 21 and it becomes difficult to attach the label La. Further, since the width W1 of the concave groove 21 is smaller than the width W2 of the sticking area 23, even if the sticking area 23 is formed in the portion overlapping the concave groove 21, at least one of the sticking areas 23 is formed. The portion can be formed on the circumferential wall 22. Therefore, even when the sticking region 23 is formed in the portion overlapping the concave groove 21 and the adhesive material enters the concave groove 21, the label La can be stuck to the body portion 20 of the plastic bottle 10.

As described above, according to the present embodiment, a plurality of concave grooves 21 extending in the vertical direction and each having a rib function are provided side by side in the circumferential direction in the body portion 20, and are provided in the circumferential direction with each other. Circumferential walls 22 having a deformation-inducing function are formed between the adjacent concave grooves 21. As a result, when the inside of the plastic bottle 10 is depressurized, the circumferential wall 22 is deformed inward in the radial direction of the plastic bottle 10, so that the decompression inside the plastic bottle 10 can be absorbed. Further, even when the circumferential wall 22 absorbs the reduced pressure inside the plastic bottle 10, the rigidity of the concave groove 21 can prevent the plastic bottle 10 from being greatly deformed. Further, each concave groove 21 is contained in the area where the label La is arranged. As a result, 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 can be made invisible and inconspicuous. Further, in the present embodiment, since the body portion 20 is composed of only each concave groove 21 and each peripheral wall 22, it is not necessary to provide a pressure reducing absorption panel on the body portion 20. Therefore, the decompression absorption panel does not deteriorate the design of the plastic bottle 10.

Further, in the present embodiment, the width W1 of each concave groove 21 is smaller than the maximum depth D of each concave groove 21. This makes it possible to effectively prevent the concave groove 21 from being deformed inward in the radial direction when the inside of the plastic bottle 10 is depressurized. Therefore, the strength around the central portion of the body portion 20 can be increased.

Further, in the present embodiment, a sticking region 23 to which an adhesive material for sticking the label La is attached is formed on the body portion 20. Further, the sticking region 23 is formed in a region where the concave groove 21 is not formed, that is, in the circumferential wall 22. As a result, it is possible to prevent a problem that the adhesive material gets into the concave groove 21 and it becomes difficult to attach the label La due to the adhesive material. Therefore, as the label La, a roll label having high productivity can be preferably used.

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

Further, in the present embodiment, the concave grooves 21 are provided so as to be evenly distributed at predetermined angles when viewed from the vertical direction. As a result, the rib function can be evenly applied to the body portion 20 of the plastic bottle 10 along the circumferential direction, and the strength around the central portion of the body portion 20, which is a easily deformable portion, can be effectively exerted. Can be enhanced.

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, in the horizontal cross-sectional view, each concave groove 21 is connected to the circumferential wall 22 and has a first inclined surface 21a and a first inclined surface that are inclined in the radial direction along the circumferential direction. It may have a second inclined surface 21b that is connected to 21a and is 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. The opening angle Ra of the first inclined surface 21a and the opening angle Rb of the second inclined surface 21b are formed by the first inclined surface 21a or the second inclined surface 21b in the horizontal cross section thereof, as shown in FIG. The angle. In this modification, the opening angle Ra is larger than the opening angle Rb. As a result, the shapeability at the time of blow molding is improved, and even the concave groove 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 having the configurations shown in FIGS. 1 to 4 was produced.

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

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

Then, using a syringe, air was evacuated from the empty portion (head space) of the plastic bottle 10. Then, it was investigated whether or not the plastic bottle 10 was greatly deformed such as a depressed deformation, an elliptical deformation, and a bending deformation, and the amount of the extracted air was measured (Table 1).

(Comparative example)
On the other hand, as a comparative example, a plastic bottle 110 having a capacity of 520 ml shown in FIG. 7 was produced. The 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, 18 g of PET single-layer preform was produced by injection molding, and a plastic bottle 100 having a capacity of 520 ml was produced by biaxially stretched blow molding with respect to this preform.

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

Then, using a syringe, air was evacuated from the empty portion (head space) of the plastic bottle 110. Then, it was investigated 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 withdrawn from the empty portion of the plastic bottle 110, a large deformation (elliptical deformation) occurred in the plastic bottle 110. On the other hand, in the plastic bottle 100 of the embodiment, even when 10 ml of air is extracted from the empty size portion of the plastic bottle 10, the plastic bottle 10 is not significantly deformed, and 20 ml of air is removed from the empty size portion of the plastic bottle 10. I was able to pull out.

As described above, the plastic bottle 10 according to the example did not undergo a large deformation when the internal pressure was reduced as compared with the plastic bottle 110 according to the comparative example. Therefore, it is considered that the reduced pressure of the plastic bottle 10 can be effectively absorbed.

10 Plastic bottle 11 Mouth 12 Shoulder 20 Body 21 Concave groove 22 Circumferential wall 23 Sticking area 30 Bottom 31 Recess 32 Radial panel La label

Claims (10)

In plastic bottles to which labels are affixed
With the mouth
The shoulder provided below the mouth and
The torso provided below the shoulders and
With a bottom provided below the body,
A plurality of concave grooves each extending in the vertical direction and having a rib function are provided side by side in the circumferential direction on the body portion.
Circumferential walls having a deformation-inducing function are formed between the concave grooves adjacent to each other in the circumferential direction.
Each of the concave grooves is a plastic bottle characterized in that it fits within the area where the label is placed. The plastic bottle according to claim 1, wherein the width of each concave groove is smaller than the maximum depth of the concave groove. The plastic bottle according to claim 1 or 2, wherein the maximum depth of the concave groove is 0.5 mm or more and 4 mm or less. The plastic bottle according to any one of claims 1 to 3, wherein the height of the concave groove is 45 mm or more and 160 mm or less. The plastic bottle according to any one of claims 1 to 4, wherein the width of the concave groove is 3 mm or more and 20 mm or less. The plastic bottle according to any one of claims 1 to 5, wherein a sticking region to which an adhesive material for sticking the label is attached is formed on the body portion. The plastic bottle according to claim 6, wherein the width of the concave groove is smaller than the width of the pasting area. The plastic bottle according to claim 6 or 7, wherein the sticking region is formed in a region where the concave groove is not formed. The plastic bottle according to any one of claims 1 to 8, wherein the region of the body portion where the concave groove is not formed has a uniform diameter from directly below the shoulder portion to directly above the bottom portion. .. The plastic bottle according to any one of claims 1 to 9, wherein the concave grooves are provided so as to be evenly distributed at predetermined angles in the circumferential direction.

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