JP2013177155A - Plastic bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic bottle securing its strength regardless of the weight reduction of the bottle and capable of suppressing the decompression deformation of the bottle incidental to the transpiration of water from the inside of the bottle.SOLUTION: A plastic bottle 10 includes a mouth 11, a neck 12, a shoulder 13, a body 20, and a bottom 30. A plurality of circumferential grooves 21 are formed in the body 20, circumferential protruded parts 22a-22d are formed between the circumferential grooves 21, and a plurality of vertically extending unit pressure absorbing regions 26 are provided on the body 20 along a circumferential direction at predetermined intervals. Each unit region 26 has a plurality of continuous and pressure absorbing panel formation parts 24 drawn inward from the circumferential protruded part 22b.

Description

  The present invention relates to a plastic bottle including a mouth, a neck, a shoulder, a trunk, and a bottom.

  In recent years, it has been desired to reduce the amount of plastic material used for bottles and to reduce the weight of plastic bottles. However, when plastic bottles are reduced in weight, there is a concern that their strength is insufficient.

JP 2009-154959 A

  On the other hand, for example, Patent Document 1 discloses a plastic bottle in which strength is ensured even when the weight is reduced. However, in the conventional light weight bottle, since the body portion is thinned, for example, even within the quality storage deadline, the water in the bottle evaporates and the bottle is deformed under reduced pressure. stay up.

  Due to such (decompression) deformation of the container accompanying the transpiration phenomenon, there is a risk that the appearance defect may occur and the product value may be reduced when the product is displayed. In addition, for example, when a bottle is stored in a case in a warehouse, the container may collapse, causing a serious trouble. These deformations are not only caused by the transpiration phenomenon during product storage, but also by volume contraction of the content liquid due to the difference between the filling temperature and the selling temperature (cooling temperature), and by volume contraction of the gas in the head space. It can be.

  On the other hand, there is also a bottle having a body having a reduced pressure absorption panel. In such a bottle, columns extending in the vertical direction are arranged between the respective vacuum absorption panels. However, when such a bottle is thinned, the pillar portion is likely to be deformed with respect to a lateral load, and therefore, it may not be suitable for sale with a vending machine.

  The present invention has been made in consideration of such points, and even when the weight of the bottle is reduced, the strength thereof can be ensured, and the bottle accompanying the evaporation of moisture from the bottle can be obtained. An object of the present invention is to provide a plastic bottle capable of suppressing deformation under reduced pressure.

  The present invention provides a plastic bottle having a mouth portion, a neck portion, a shoulder portion, a trunk portion, and a bottom portion, and a plurality of circumferential grooves are provided in the trunk portion to form circumferential convex portions between the circumferential grooves. In the body portion, a plurality of unit pressure absorption regions extending in the vertical direction are provided at predetermined intervals along the circumferential direction, and each unit pressure absorption region has a plurality of continuous pressures drawn inward from the circumferential convex portion. It is a plastic bottle characterized by having a panel forming part for absorption.

  The present invention is the plastic bottle characterized in that each unit pressure absorption region has a trapezoidal shape that is tapered upward or downward.

  According to the present invention, in each unit pressure absorption region, the depth from the outermost surface of the body portion to the center of the surface of each panel formation portion is the other side from the panel formation portion located on one side of the upper or lower portion of each unit pressure absorption region. It is a plastic bottle characterized by gradually becoming deeper toward the panel forming portion located in the area.

  According to the present invention, in each unit pressure absorption region, the circumferential length of each panel formation portion is the panel formation portion located on the other side from the panel formation portion located on one side of the upper or lower part of each unit pressure absorption region. It is a plastic bottle characterized by gradually becoming longer toward

  The present invention is the plastic bottle characterized in that the panel forming portion of each unit pressure absorption region is provided on each circumferential convex portion.

  The present invention is the plastic bottle characterized in that the panel forming portion of each unit pressure absorption region is provided only on some of the circumferential convex portions.

  In the present invention, a plurality of unit reinforcement regions extending in the vertical direction are provided in the body portion at predetermined intervals along the circumferential direction, and each unit reinforcement region is a plurality of continuous reinforcements protruding outward from the panel forming portion. The plastic bottle is characterized in that each unit pressure absorbing region and each unit reinforcing region are alternately arranged along the circumferential direction.

  The present invention is the plastic bottle characterized in that each unit reinforcing region has a trapezoidal shape that is tapered upward or downward.

  According to the present invention, in each unit reinforcing region, the depth from the outermost surface of the body portion to the center of the surface of each column forming portion is located on the other side from the column forming portion located on one side of the upper or lower part of each unit reinforcing region. It is a plastic bottle characterized by gradually becoming deeper toward the column forming part.

  According to the present invention, in each unit reinforcing region, the circumferential length of each column forming portion is directed from the column forming portion located on one side of the upper or lower portion of each unit reinforcing region to the column forming portion located on the other side. It is a plastic bottle characterized by gradually becoming longer.

  The present invention is the plastic bottle characterized in that the average thickness of the body portion is 50 μm to 200 μm.

  According to the present invention, the strength of the bottle can be ensured even when the bottle is lightened, and the decompression deformation of the bottle due to the evaporation of moisture from the bottle can be suppressed.

FIG. 1 is a front view showing a plastic bottle according to an embodiment of the present invention. FIG. 2 is a horizontal sectional view showing a plastic bottle according to one embodiment of the present invention (a sectional view taken along line AA in FIG. 1). FIG. 3 is a horizontal sectional view showing a plastic bottle according to an embodiment of the present invention (a sectional view taken along line BB in FIG. 1). FIG. 4 is a front view showing a plastic bottle according to a modification of the embodiment of the present invention. FIG. 5 is a front view showing a plastic bottle according to a comparative example.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing an embodiment of the present invention.

  First, the outline of the plastic bottle according to the present embodiment will be described with reference to FIGS. In this specification, “upper part”, “lower part”, “upper part”, and “lower part” refer to the upper part, lower part, upper part, and lower part, respectively, when the plastic bottle 10 is upright (FIG. 1). Say.

  As shown in FIG. 1, the plastic bottle 10 includes a mouth portion 11, a neck portion 12 connected to the mouth portion 11, a shoulder portion 13 connected to the neck portion 12, a trunk portion 20 connected to the shoulder portion 13, and a trunk portion. 20 and a bottom portion 30 connected to 20.

  Among these, the trunk | drum 20 consists of a substantially cylindrical shape, The several circumferential direction groove | channel 21 is provided in the surface. Each circumferential groove 21 is formed in the entire circumferential direction of the body portion 20, and the horizontal cross section thereof has a circular shape. Moreover, these circumferential grooves 21 are arranged at equal intervals along the vertical direction. Further, circumferential protrusions 22a to 22b are formed between the circumferential grooves 21, respectively. 1 and 2, each circumferential groove 21 is formed of a horizontal rib, but is not limited thereto, and may be formed of a wave-shaped (for example, sinusoidal) rib.

  The body 20 is provided with a plurality (six) of unit pressure absorbing regions 26 extending in the vertical direction along the circumferential direction, and a plurality of unit reinforcing regions 27 extending along the circumferential direction (6). Pieces). These unit pressure absorbing regions 26 and unit reinforcing regions 27 are alternately arranged along the circumferential direction.

  Each unit pressure absorption region 26 has a tapered trapezoidal shape toward the upper side, and is arranged at predetermined intervals (equal intervals) along the circumferential direction. Each unit reinforcement region 27 has a trapezoidal shape that tapers downward, and is arranged at predetermined intervals (equal intervals) along the circumferential direction. Note that the number of the unit pressure absorbing regions 26 and the unit reinforcing regions 27 are the same, and preferably 6 to 10 respectively.

  Each unit pressure absorption region 26 has a plurality of (three) pressure absorption panel forming portions 24 arranged continuously in the vertical direction. Each panel forming portion 24 is formed inwardly from the circumferential convex portion 22b.

  As shown in FIG. 1, each panel forming portion 24 has a substantially trapezoidal shape that tapers upward. Further, the length in the circumferential direction (lateral direction) of each panel forming portion 24 is from the panel forming portion 24 positioned above each unit pressure absorbing region 26 to the panel forming portion 24 positioned below each unit pressure absorbing region 26. It is getting longer gradually toward. The shape of each panel forming portion 24 does not have to be strictly trapezoidal. For example, the upper base and the lower base constituting the trapezoid may be curved upward and downward, respectively. In this specification, the shape in which the upper base and the lower base are curved is also referred to as a trapezoid.

  On the other hand, each unit reinforcing region 27 has a plurality of (three) reinforcing column forming portions 25 that are continuously arranged in the vertical direction and are formed to protrude outward from the panel forming portion 24. Yes. Each column forming portion 25 has a substantially trapezoidal shape that tapers downward. Further, the length in the circumferential direction (lateral direction) of each column forming portion 25 is from the column forming portion 25 positioned below each unit reinforcing region 27 to the column forming portion 25 positioned above each unit reinforcing region 27. And gradually getting longer.

  By the way, in this Embodiment, several circumferential direction convex part 22a-22b is comprised from three circumferential direction convex parts 22a located in the bottle upper part, and three circumferential direction convex parts 22b located in the bottle lower part. Yes. Among these, the three circumferential protrusions 22a located at the upper part of the bottle are not provided with the panel forming part 24 and the column forming part 25, and the horizontal cross sections thereof are substantially circular. On the other hand, a panel forming portion 24 and a column forming portion 25 are provided on the three circumferential convex portions 22b located at the bottom of the bottle.

  2 and 3 are horizontal cross-sectional views of the plastic bottle 10 according to the present embodiment, showing cross sections taken along the lines AA and BB in FIG. 1, respectively.

  As shown in FIG. 2 and FIG. 3, in each circumferential protrusion 22 b located at the bottom of the bottle, the panel forming portion 24 of the unit pressure absorbing region 26 and the column forming portion 25 of the unit reinforcing region 27 are arranged in the circumferential direction. Alternatingly arranged along.

In this case, in each unit pressure absorption region 26, the depth from the outermost surface of the body portion (the surface of the circumferential convex portion 22a in the present embodiment) to the center of the surface of each panel forming portion 24 is the unit pressure absorption region. 26 gradually increases from the panel forming portion 24 located above the unit 26 toward the panel forming portion 24 located below each unit pressure absorption region 26. For example, the depth to the surface center of each panel forming portions 24 and d _A1 in the cross section shown in FIG. 2, when the depth to the surface center of each panel forming section 24 was d _A2 in the cross section shown in FIG. 3, The relationship d _A1 <d _A2 is established. In addition, the depth from the trunk | drum outermost surface to the surface center of each panel formation part 24 can be 0.8 mm-2.0 mm, for example.

Further, in each unit reinforcing region 27, the depth from the outermost surface of the body portion to the center of the surface of each column forming portion 25 is from the column forming portion 25 positioned below each unit reinforcing region 27 to the upper portion of each unit reinforcing region 27. It gradually becomes deeper toward the column forming portion 25 located at the position. For example, the depth to the surface center of each pillar forming portion 25 and d _B1 in the cross section shown in FIG. 2, when the depth to the surface center of each pillar forming portion 25 and the d _B2 in the cross section shown in FIG. 3, The relationship d _B1 > d _B2 is established. In addition, the depth from the trunk | drum outermost surface to the surface center of each pillar formation part 25 can be 0.0 mm-1.6 mm, for example.

  By the way, the size of the plastic bottle 10 is not limited, and may be made of any size bottle. For example, the capacity of the plastic bottle 10 may be about 350 ml or about 500 ml.

  Moreover, although the average thickness of the plastic bottle 10 in the trunk | drum 20 is not limited to this, For example, it can be set as 50 micrometers-200 micrometers. Further, the weight of the plastic bottle 10 is not limited to this, but may be 8 to 17 g. Thus, by reducing the thickness of the plastic bottle 10, the weight of the plastic bottle 10 can be reduced.

  Moreover, the plastic bottle 10 can be produced by biaxially stretch blow molding a preform produced by injection molding a synthetic resin material. As the main material of the preform, that is, the plastic bottle 10, a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PLA (polylactic acid), etc. should be used. Can do.

  1 to 3, the unit pressure absorption region 26 and the unit reinforcement region 27 are provided in the lower portion of the body portion 20, but are not limited thereto.

  For example, as shown in FIG. 4, the unit pressure absorbing region 26 and the unit reinforcing region 27 may be provided on the upper portion of the trunk portion 20. In this case, the plurality of circumferential convex portions 22a to 22b are composed of three circumferential convex portions 22b located in the upper portion of the bottle and three circumferential convex portions 22a located in the lower portion of the bottle. Among these, the circumferential convex part 22b is provided with a panel forming part 24 and a column forming part 25 as in the embodiment shown in FIGS. On the other hand, the panel-formation part 24 and the column formation part 25 are not provided in the circumferential direction convex part 22a, respectively. 4, each unit pressure absorption region 26 has a tapered trapezoidal shape downward, and each unit reinforcing region 27 has an upward shape, unlike the configuration shown in FIGS. 1 to 3. Has a tapered trapezoidal shape. 4, the same parts as those of the embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  Further, the unit pressure absorbing region 26 and the unit reinforcing region 27 are not limited to the above-described embodiments, and may be provided in the entire vertical direction of the trunk portion 20. Furthermore, the unit pressure absorbing region 26 and the unit reinforcing region 27 are provided in the lower portion of the body portion 20 so that each unit pressure absorbing region 26 has a tapered trapezoidal shape downward, and each unit reinforcing region. 27 may have a trapezoidal shape that tapers upward. Alternatively, the unit pressure absorbing region 26 and the unit reinforcing region 27 are provided on the upper portion of the body portion 20 so that each unit pressure absorbing region 26 has a tapered trapezoidal shape upward, and each unit reinforcing region 27 may have a tapered trapezoidal shape downward.

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

  First, an empty plastic bottle 10 is prepared, and the plastic bottle 10 is filled with a content liquid such as drinking water. Subsequently, the mouth portion 11 is closed with a cap (not shown). A plurality of the plastic bottles 10 thus closed are packed together in a cardboard or the like, and then stored, for example, by loading the cardboard in a warehouse.

  When a certain period of time elapses in this state, for example, the content liquid may evaporate from the surface of the plastic bottle 10 even within the quality storage deadline. In this case, the pressure in the plastic bottle 10 decreases, and the plastic bottle 10 may be deformed under reduced pressure. As described above, when the plastic bottle 10 is deformed under reduced pressure due to the transpiration phenomenon, an appearance defect may occur and the value of the product may be reduced when the product is displayed. Further, it may cause serious trouble such as collapse of the plastic bottle 10 while it is stored in the warehouse. In particular, when the thickness of the plastic bottle 10 is made thinner than that of the conventional plastic bottle and the size thereof is reduced, the amount of transpiration is relatively increased, so that the possibility of such a problem is considered to increase.

  On the other hand, according to the present embodiment, each unit pressure absorption region 26 has a plurality of continuous pressure absorption panel forming portions 24 drawn inward from the circumferential convex portion 22b. Thereby, even if it is a case where water evaporates from the inside of the plastic bottle 10 after the passage of a certain period, each panel forming part 24 can absorb the pressure and suppress the decompression deformation of the plastic bottle 10. As a result, even when the plastic bottle 10 is reduced in weight, it is possible to prevent the body portion 20 from being deformed into an irregular shape (for example, an oval shape), and to prevent the appearance failure of the plastic bottle 10. It can prevent that a commercial value falls. Moreover, it is possible to prevent the plastic bottle 10 from collapsing during storage.

  Further, according to the present embodiment, each unit reinforcing region 27 has a plurality of continuous reinforcing column forming portions 25 projecting outward from the panel forming portion 24. Thereby, the reinforcement function with respect to the lateral load of the body part 20 is enhanced, and the body part 20 is hardly deformed. Thereby, when a load load is applied to the trunk portion 20 from the lateral direction, for example, when the barrel portion 20 is held by a user or sold by a vending machine, the load can be dispersed. As a result, it becomes easy to sell the plastic bottle 10 with a vending machine, and the grip property of the plastic bottle 10 can be improved.

  Furthermore, according to the present embodiment, a plurality of circumferential grooves 21 are provided in the body portion 20, and the circumferential convex portions 22a to 22b are formed between the circumferential grooves 21 (a so-called bellows structure). . Thereby, since the cushioning property is imparted to the plastic bottle 10, it is possible to prevent the plastic bottle 10 from being crushed even when a loading load is applied to the plastic bottle 10 in the vertical direction. Moreover, since such a bellows structure increases the strength of the body portion 20 against the lateral load, the grip performance of the plastic bottle 10 can also be improved. Furthermore, when moisture is evaporated from the plastic bottle 10 as described above, the reduced pressure deformation of the plastic bottle 10 can be suppressed by the rigidity of the bellows structure.

  Furthermore, according to the present embodiment, in each unit pressure absorbing region 26 (each unit reinforcing region 27), the depth from the outermost surface of the body portion to the center of the surface of each panel forming portion 24 (each column forming portion 25). The panel forming part 24 (column forming part 25) located on the other side from the panel forming part 24 (column forming part 25) located on one side of the upper part or the lower part of each unit pressure absorbing area 26 (each unit reinforcing area 27). ) Gradually getting deeper. Thus, when the load is applied to the plastic bottle 10 by changing the depth of the panel forming portion 24 (column forming portion 25) in the vertical direction, the deformation direction of the body portion 20 is changed at each position in the vertical direction. It is possible to disperse and make it difficult for the body portion 20 to be deformed (decrease the direction dependency of deformation).

  Furthermore, according to the present embodiment, each unit pressure absorbing region 26 (each unit reinforcing region 27) has a tapered trapezoidal shape upward or downward. Each panel forming portion 24 (column forming portion 25) has a trapezoidal shape, and its circumferential length is located on one side of the upper or lower portion of each unit pressure absorbing region 26 (each unit reinforcing region 27). It gradually becomes longer from the panel forming portion 24 (column forming portion 25) to the panel forming portion 24 (column forming portion 25) located on the other side. As described above, when the circumferential length of the panel forming portion 24 (column forming portion 25) is varied in the vertical direction, when a load is applied to the plastic bottle 10, the body portion 20 is positioned at each location in the vertical direction. The deformation direction is dispersed, and deformation of the body portion 20 is difficult to occur (the direction dependency of the deformation is reduced).

  Furthermore, according to this Embodiment, the panel formation part 24 and the column formation part 25 are each provided in the circumferential direction convex part 22b. In this case, since there is no large unevenness in the horizontal cross section of the body part 20 and it has a substantially circular shape (see FIGS. 2 and 3), even if a wound label (not shown) is attached around the body part 20 , Wound labels do not float or peel off.

  Furthermore, according to the present embodiment, the body portion 20 is not provided with a reduced pressure absorption panel as used in a conventional bottle, and the unevenness of the body portion 20 is less than that of a conventional bottle. The design of the plastic bottle 10 can be improved.

  Next, specific examples in the present embodiment will be described.

  The following two types of plastic bottles (Example 1 and Comparative Example 1) were evaluated for their reduced pressure absorption characteristics.

Example 1
A 350 ml plastic bottle 10 (Example 1) having the structure shown in FIGS. 1 to 3 was produced. In this case, the plastic bottle 10 (Example 1) was produced by carrying out biaxial stretch blow molding of 9g preform. The average thickness of the body 20 of the plastic bottle 10 (Example 1) is 100 μm, which is thinner than the plastic bottles that are conventionally used.

(Comparative Example 1)
A 350 ml plastic bottle 100 (Comparative Example 1) having the configuration shown in FIG. 5 was produced. Unlike the plastic bottle 10 of the first embodiment, the plastic bottle 100 is not provided with the unit pressure absorbing region 26 and the unit reinforcing region 27. In this case, the weight of the plastic bottle 100 was set to 9 g as in Example 1.

  Each of these plastic bottles (Example 1 and Comparative Example 1) was filled with water at 25 ° C. and closed with a cap. Next, these plastic bottles were placed under refrigeration at 8 ° C. to cool the water inside. As a result, the inside of the plastic bottle 100 of Comparative Example 1 was depressurized due to the temperature difference between filling and cooling (cooling depressurization phenomenon), and thus the cross section of the body portion was distorted into an elliptical shape. In contrast, in the plastic bottle 10 of Example 1, the panel forming part 24 absorbed the reduced pressure, so that the cross section of the body part was not distorted and the shape was maintained.

  Next, each plastic bottle (Example 1 and Comparative Example 1) was left standing at room temperature for a certain period (120 days) in an upright state.

  As a result, the water in the plastic bottle 10 of Example 1 was evaporated, but the shape was maintained because the panel forming part 24 absorbed the reduced pressure. On the other hand, as for the plastic bottle 100 of the comparative example 1, the cross section of the trunk | drum was distorted elliptically because internal water evaporated.

DESCRIPTION OF SYMBOLS 10 Plastic bottle 11 Mouth part 12 Neck part 13 Shoulder part 20 Body part 21 Circumferential groove 22a-22b Circumferential convex part 24 Panel formation part 25 Column formation part 26 Unit pressure absorption area 27 Unit reinforcement area 30 Bottom part

Claims (11)

In a plastic bottle with a mouth, neck, shoulder, torso, and bottom,
A plurality of circumferential grooves are provided in the body portion to form circumferential protrusions between the circumferential grooves,
A plurality of unit pressure absorption regions extending in the vertical direction are provided in the body portion at predetermined intervals along the circumferential direction,
Each unit pressure absorption region has a plurality of continuous pressure absorption panel forming portions drawn inward from the circumferential convex portion.   2. The plastic bottle according to claim 1, wherein each unit pressure absorbing region has a trapezoidal shape that tapers upward or downward.   In each unit pressure absorbing region, the depth from the outermost surface of the body portion to the center of the surface of each panel forming portion is the panel located on the other side from the panel forming portion located on one side of the upper or lower part of each unit pressure absorbing region. The plastic bottle according to claim 1, wherein the plastic bottle is gradually deepened toward the forming portion.   In each unit pressure absorbing region, the circumferential length of each panel forming portion is gradually increased from the panel forming portion located on one side of the upper or lower portion of each unit pressure absorbing region toward the panel forming portion located on the other side. The plastic bottle according to any one of claims 1 to 3, wherein the plastic bottle is long.   The plastic bottle according to any one of claims 1 to 4, wherein the panel forming portion of each unit pressure absorption region is provided on a circumferential convex portion.   6. The plastic bottle according to claim 5, wherein the panel forming portion of each unit pressure absorption region is provided only on a part of the plurality of circumferential convex portions.   A plurality of unit reinforcing regions extending in the vertical direction are provided in the body portion at predetermined intervals along the circumferential direction, and each unit reinforcing region is formed with a plurality of continuous reinforcing columns protruding outward from the panel forming portion. The plastic bottle according to any one of claims 1 to 6, wherein each of the unit pressure absorbing regions and each of the unit reinforcing regions is alternately arranged along a circumferential direction.   8. The plastic bottle according to claim 7, wherein each unit reinforcing region has a tapered trapezoidal shape upward or downward.   In each unit reinforcing region, the depth from the outermost surface of the body portion to the center of the surface of each column forming portion is the column forming portion located on the other side from the column forming portion located on one side of the upper or lower part of each unit reinforcing region. The plastic bottle according to claim 7, wherein the plastic bottle is gradually deepened toward the surface.   In each unit reinforcing region, the length in the circumferential direction of each column forming portion is gradually increased from the column forming portion located on one side of the upper or lower portion of each unit reinforcing region toward the column forming portion located on the other side. The plastic bottle according to any one of claims 7 to 9, wherein the plastic bottle is formed.   The plastic bottle according to any one of claims 1 to 10, wherein an average thickness of the body portion is 50 µm to 200 µm.

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