JP6257338B2 - Plastic bottle - Google Patents

Description

  The present invention relates to a synthetic resin bottle, and more particularly, to a synthetic resin bottle provided with a reduced pressure absorbing portion.

  Conventionally, synthetic resin bottles molded from synthetic resins such as polyethylene terephthalate (PET) have been used as containers for food and drink. Such a bottle made of synthetic resin is filled with contents at a high temperature from the viewpoint of hygiene, and thereafter, a cap or the like is attached to the mouth and sealed, and is rapidly cooled from the outside by cooling water or the like. And by this rapid cooling, the internal pressure of a bottle will fall rapidly.

  Therefore, such a synthetic resin bottle may be deformed such as buckling due to a pressure difference between the inside and outside. In order to prevent this deformation, the synthetic resin bottle needs to be provided with a reduced pressure absorbing portion. Many of the reduced pressure absorption parts are provided as reduced pressure absorption panels on the body of the bottle (see, for example, Patent Document 1). The reduced pressure absorption panel is formed so as to be more easily deformed than the other part of the body, and absorbs the pressure difference by being deformed toward the inside of the container by the pressure difference.

JP 2013-95479 A

  However, such a vacuum absorption panel provided in the bottle body does not cause a problem when a plastic shrink label is used as the packaging of the container, but when a paper label is used, the panel With the deformation of the body portion due to the reduced pressure absorption, there is a problem that wrinkles or the like may occur on the label, and it is difficult to use a paper label.

  Then, an object of this invention is to provide the synthetic resin bottle which can be used irrespective of the material of a label in the synthetic resin bottle provided with the reduced pressure absorption part.

The present invention is a synthetic resin bottle comprising a mouth portion, a trunk portion, and a bottom portion, the bottom portion having a bottom plate, the bottom plate being provided with a reduced pressure absorption portion, and the reduced pressure absorption The portion is composed of a mortar-shaped concave portion in which a concave groove is formed, and the concave groove is a spiral groove that is continuous inward from the peripheral edge of the mortar-shaped concave portion (however, the bottom is not continuous) except) a synthetic resin bottle which is characterized that you have provided for the displaceable該擂pot-shaped recess in response to a pressure difference between the der Rutotomoni the bottle out.

  In the present invention, a plurality of the concave grooves may be provided so as not to cross each other. In the present invention, the bottom plate may further have a recess formed at the center of the bottom plate so as to be recessed toward the inside of the bottle. In the present invention, a reinforcing portion can be provided in the body portion. In the present invention, the reinforcing portion can be composed of a plurality of circumferential grooves arranged in parallel in the height direction.

  The present invention provides a bottom plate on the bottom of the bottle as a reduced pressure absorbing portion provided with a mortar-shaped recess formed with a concave groove, and the concave groove continues inward from the peripheral edge of the mortar-shaped recess. As a result, it is possible to absorb the reduced pressure in the bottle without providing the reduced pressure absorbing portion in the bottle body. Therefore, even if a paper label is used, it is possible to prevent problems such as wrinkles.

1 is a perspective view showing a first embodiment of the present invention. It is a front view which shows 1st Embodiment of this invention. It is a bottom view which shows 1st Embodiment of this invention. It is a perspective view which shows 2nd Embodiment of this invention. It is a front view which shows 2nd Embodiment of this invention. It is a bottom view which shows 2nd Embodiment of this invention.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 3. A synthetic resin bottle 1 (hereinafter also simply referred to as a bottle 1) includes a mouth 2, a body 3, and a bottom 4. The mouth portion 3 is provided for communicating the inside and outside of the bottle 1 in order to pour out the contents filled in the bottle 1. The mouth portion 3 is formed in a substantially cylindrical shape, and is formed with a fitting groove 5 for mounting an inner plug (not shown) or the like.

  The trunk portion 3 is formed in a substantially cylindrical shape, and is continuous with the mouth portion 2 via a substantially hemispherical shoulder portion 6. Moreover, in this embodiment, the trunk | drum 3 has a reinforcement part which gives rigidity to the trunk | drum 3 in order to prevent that the trunk | drum 3 deform | transforms when external force is added to the bottle 1. FIG. The said reinforcement part is comprised from the some circumferential groove | channel 7 paralleled in the height direction of a bottle. The circumferential groove 7 is a circumferential recess formed on the outer peripheral surface of the body portion 3, and is formed to be convex when viewed from the inside of the bottle 1.

  The bottom part 4 is formed in a substantially cylindrical shape with a bottom, and has a side wall 8 and a bottom plate 9. The side wall 8 is continuous with the base end of the body portion 3. The bottom plate 9 is provided with a peripheral portion 9a formed in a flat plate shape for stably placing the bottle 1 and a reduced pressure absorbing portion provided inside the peripheral portion 9a. A recess 11 that is recessed toward the inside of the bottle 1 is formed in the center portion 9 b of the bottom plate 9. The recess 11 is formed in a bottomed hollow truncated cone shape.

  The reduced-pressure absorbing part is composed of a mortar-shaped concave part 10 in which a concave groove 12 is formed. The mortar-shaped concave portion 10 is a concave portion provided so as to incline upward from the peripheral portion 9a of the bottom plate 9 toward the central portion 9b, and the concave groove 12 extends inward from the peripheral portion 10a of the mortar-shaped concave portion 10 It is a spiral groove in a bottom view that is continuous toward the surface, that is, a spiral groove.

  The concave groove 12 is formed in a substantially U shape in sectional view and is formed to be a convex portion when viewed from the inside of the bottle 1. Further, the concave groove 12 is provided to give elasticity to the mortar-shaped concave portion 10 so that it can be displaced according to the pressure difference between the inside and outside of the bottle 1, that is, to make the mortar-shaped concave portion 10 as a decompression absorbing portion of the bottle 1. ing.

  When the internal pressure of the bottle 1 decreases and a pressure difference between the inside and outside of the bottle 1 occurs, the concave groove 12 first deforms toward the inside of the bottle 1, thereby forming a bowl-shaped concave portion in which the concave groove 12 is formed. 10 is displaced toward the inside of the bottle 1, and the internal pressure of the bottle 1 is adjusted by the displacement of the bowl-shaped recess 10, and the pressure difference inside and outside the bottle 1 is absorbed.

  At that time, it is important that the concave groove 12 is provided in a spiral shape. For example, even if the concave groove 12 is formed as a plurality of annular grooves, it is possible to give elasticity to the mortar-shaped concave portion 10, but since each groove is separated, each groove is caused by the pressure difference. It will be transformed independently. Therefore, the mortar-shaped recess 10 cannot be uniformly displaced, and it becomes difficult to absorb the pressure difference between the inside and outside of the bottle 1. Further, even if a groove extending in the radial direction is formed together and the annular groove is connected by the groove, the groove is a factor that hinders the displacement of the mortar-shaped recess 10, and so on.

  On the other hand, when the concave groove 12 is formed in a spiral shape, since the concave groove 12 is a continuous groove, the concave groove 12 can be deformed in series as a whole, and the bowl-shaped concave portion 10 is substantially uniform. Can be displaced. Therefore, it becomes possible to absorb the pressure difference inside and outside the bottle 1 efficiently.

  Accordingly, the bottle 1 is provided on the bottom plate 9, and the mortar-shaped recess 10 formed with the recessed groove 12 absorbs the pressure difference between the inside and the outside of the bottle 1, so that deformation of the body 3 due to the pressure difference is suppressed, For example, even if a paper label (not shown) is used as packaging, wrinkles or the like can be prevented from occurring on the label.

  Moreover, in this embodiment, since the reinforcement part (circumferential groove 7) is further provided in the trunk | drum 3, and the rigidity with respect to the external force of the trunk | drum 3 is given, deformation | transformation of the trunk | drum 3 during transportation etc. can be prevented. It is possible, and it can prevent more that wrinkles etc. arise in the label concerned. Naturally, a plastic shrink label (not shown) that is unlikely to cause such a problem can be used as a packaging for the bottle 1.

  In the bottle 1 having the vacuum absorbing part at the bottom part 4, as a secondary advantage that the vacuum absorbing part is a mortar-shaped concave part 10 in which a spiral concave groove 12 is formed, as a bottle having a vacuum absorbing part at the bottom, for example, The bottle described in JP 2013-154908 A is known, but when considering blow molding, which is a general technique for molding synthetic resin bottles, it is easier than the known bottles. The point which can be molded is mentioned.

  A second embodiment of the present invention will be described with reference to FIGS. The difference from the first embodiment is that a plurality of concave grooves 12 are formed in the bowl-shaped concave portion 10. Since other configurations are the same as those in the first embodiment, the description thereof is omitted.

  In the present embodiment, the concave groove 12 is formed as a spiral groove that is continuous inward from the peripheral edge portion 10a of the mortar-shaped concave portion 10 as in the first embodiment. Another concave groove 12 having the same shape is provided so as to be folded back from the portion 9b (recess 11).

  The two concave grooves 12, 12 are provided so that the other concave groove 12 is positioned between the concave grooves 12 so as not to cross each other. Moreover, the rib 11 for the reinforcement is formed in the recess 11 of this embodiment so that it may be intermittently juxtaposed in the circumferential direction. Note that three or more concave grooves 12 may be provided as long as they do not intersect each other.

  In the present embodiment, since the plurality of concave grooves 12 are formed in the mortar-shaped concave portion 10, it is possible to further increase the absorption of the pressure difference inside and outside the bottle 1 of the mortar-shaped concave portion 10 which is a reduced pressure absorbing portion.

  As mentioned above, although this invention was demonstrated by the said embodiment, this invention is not limited to the said embodiment, In the range which does not change the summary of invention, it can change suitably. For example, from the viewpoint of molding, one end of the concave groove 12 is tapered, but if the molding is possible, it is not always necessary to taper, and the shape can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Synthetic resin bottle 2 Mouth part 3 Body part 4 Bottom part 5 Insertion groove 6 Shoulder part 7 Circumferential groove 8 Side wall 9 Bottom plate 9a Peripheral part 9b Center part 10 Bowl-shaped recessed part 10a Peripheral part 11 Recess 12 Recessed groove 13 Rib

Claims (5)

A synthetic resin bottle,
A mouth, a torso, and a bottom;
The bottom has a bottom plate,
The bottom plate is provided with a vacuum absorbing part,
The reduced pressure absorbing portion is composed of a bowl-shaped concave portion having a concave groove formed,
Concave-shaped groove, the spiral groove continuously extending inwardly from the periphery of the該擂pot-shaped recess (excluding a bottom portion thereof not continuous) according to a pressure difference der Rutotomoni the bottle and out synthetic resin bottle which is characterized that you have provided for the displaceable該擂pot-shaped recess Te.
  The synthetic resin bottle according to claim 1, wherein a plurality of the concave grooves are provided so as not to cross each other.   The synthetic resin bottle according to claim 1 or 2, wherein the bottom plate further includes a recess formed in a central portion of the bottom plate so as to be recessed toward the inside of the bottle.   The synthetic resin bottle according to any one of claims 1 to 3, wherein the body portion is provided with a reinforcing portion.   The synthetic resin bottle according to claim 4, wherein the reinforcing portion includes a plurality of circumferential grooves arranged in parallel in the height direction.

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