JPH05254532A - Plastic-made bottle with reinforced bottom - Google Patents

Abstract

PURPOSE:To improve the rigidity of the bottom part of a container and prevent its deformation resulting from the contact between heels by providing a plurality of bottom reinforcing parts consisting of recessed or raised parts peripherally near the lower end of the wall surface of the bottom part. CONSTITUTION:A plurality of elliptical or circular recessed reinforcing parts 51 are provided peripherally near the lower end of a bottom part 5 of a bottle 1. Although the number of the reinforcing parts varies with the size and shape, it is preferably from 15 to 25. They may be arranged parallel to the axis of the bottle or at an angle thereto. The length of the reinforcing part 51 is set at 10-90% of the height of the side of the bottom part 5 of the bottle 1 and its width is set at 0.5-90% of the overall circumference of the bottom part 5. In this case, the reference side of the bottom part refers to the side between the bottom part 5 and a lateral groove 8 if so formed and the side of a diameter-enlarged part formed as the bottom part in a case without the lateral groove 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic bottle, and more particularly to a bottom reinforced plastic bottle.

[0002]

BACKGROUND OF THE INVENTION Biaxially stretched blow-molded bottles made of saturated polyester resin represented by polyethylene terephthalate have excellent transparency and surface gloss, and are beautiful and have a gas barrier. Excellent in water resistance, water impermeability and storage stability. In addition, it has many advantages such as low heat generation during combustion and easy disposal because it does not damage the furnace. Therefore, it is widely used in various drinking water, seasonings, containers (bottles) for foods such as alcoholic beverages, and the like.

Such a biaxially stretch blow molded bottle is
For example, in the process of filling the contents, the bottles are arranged in a line, and the heels of the bottles may come into contact with each other. At this time, if the strength of the bottom portion is not sufficient, there is a problem that a dent occurs, and when the tendency is remarkable, it remains as a permanent deformation. Further, the heels of the bottles may come into contact with each other during transportation and display, and similarly dents are likely to occur. For this reason, a bottle having a sufficiently reinforced bottom is desired.

As such a bottom reinforced plastic bottle, Japanese Patent Application Laid-Open No. 62-52034 has a dent panel extending in the axial direction of the bottle main body and an annular rib located below the bottle main body. Is disclosed. The bottle has achieved some bottom reinforcement, but is not yet fully reinforced.

Therefore, an object of the present invention is to provide a plastic bottle whose bottom portion is sufficiently reinforced so that the bottom portion does not deform even when the heels of the bottles come into contact with each other.

[0006]

As a result of earnest research in view of the above object, the present inventor has found that in the vicinity of the lower end of the bottom wall surface of a plastic bottle, a plurality of bottom reinforcing portions composed of concave portions and / or convex portions are circumferentially arranged. It was found that the bottom portion is significantly reinforced by providing the above, and the present invention was conceived.

That is, in the plastic bottle of the present invention comprising the mouth portion, the shoulder portion, the body portion and the bottom portion, a plurality of bottom reinforcing portions each having a concave portion and / or a convex portion are formed in the circumferential direction in the vicinity of the lower end of the wall surface of the bottom portion. It is provided in.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on embodiments with reference to the accompanying drawings. FIG. 1 is a front view of a plastic bottle according to an embodiment of the present invention. Bottle 1 is mouth 2
And a shoulder portion 3, a body portion 4, and a bottom portion 5. It should be noted that the pressure absorbing panel 6 and the reinforcing lateral grooves 7, 8 and the like provided in a normal biaxially stretched bottle can be appropriately provided as necessary.

In the vicinity of the lower end portion of the bottom portion 5, a plurality of elliptic concave concave portions 51 ... Are provided in the circumferential direction. The number of the reinforcing portions 51 varies depending on the size, shape, etc., but is preferably about 15 to 25. Further, the respective reinforcing portions may be arranged vertically in parallel, but in some cases, they may be arranged obliquely with respect to the vertical axis.

Further, the size of each of the reinforcing portions 51 is appropriately set according to the size of the bottle (height and the entire circumference of the bottom portion). 10 to 90% of the height of the bottom side is preferable, especially 25 to
It is preferably 50%. The lateral width (width in the circumferential direction) is preferably about 0.5 to 90% of the entire length of the bottom of the bottle, and more preferably 25 to 75%. If the reinforcing portion 51 is out of the above range with respect to the height and the entire circumference of the bottle, a sufficient bottom reinforcing effect cannot be obtained, which is not preferable. The bottom side surface of the bottle means the side surface between the lateral groove 8 and the bottom portion of the bottle when the lateral groove 8 is present, and the side surface of the enlarged diameter portion formed as the bottom portion when the lateral groove 8 is not present.

The shape of the reinforcing portion 51 is not particularly limited and may be various shapes such as a circle, an ellipse, a triangle and a quadrangle, but a vertically elongated ellipse is preferable. Three-dimensionally, it may be concave or convex, and the concave shape and the convex shape as a whole may be alternately arranged. In particular, the concave shape is preferable because the liquid is unlikely to remain after pouring.

The location where such a reinforcing portion 51 is provided is appropriately set near the lower end of the bottom portion in order to sufficiently reinforce the bottom portion of the bottle, depending on the size of each bottle and the like.
For example, the upper end and the lower end of the reinforcing portion 51 may be provided so as to be inside from the upper end and the lower end of the bottom side surface of the bottle by about 1 to 95%, more preferably about 25 to 75%.

Polyester is suitable as a resin for forming such a bottom reinforced plastic bottle.
As the polyester resin, a thermoplastic resin composed of saturated dicarboxylic acid and saturated dihydric alcohol can be used. Saturated dicarboxylic acids include terephthalic acid, isophthalic acid, phthalic acid, naphthalene-1,4- or 2,6-dicarboxylic acid, diphenyl ether-4,4'-dicarboxylic acid, diphenyldicarboxylic acids, diphenoxyethanediethanedicarboxylic acids And the like, aliphatic dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid, decane-1,10-dicarboxylic acid and the like, alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid and the like can be used. As the saturated dihydric alcohol, aliphatic glycols such as ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, hexamethylene glycol, dodecamethylene glycol and neopentyl glycol are used. Glycols, alicyclic glycols such as cyclohexanedimethanol, 2,2-bis (4'-β-hydroxyethoxyphenyl) propane, and other aromatic diols can be used. A preferred polyester is polyethylene terephthalate consisting of terephthalic acid and ethylene glycol.

Polyester resin has an intrinsic viscosity of 0.5 to 1.5.
, Preferably having a value in the range 0.55 to 0.8. In addition, such polyester is produced by melt polymerization,
Those that have been subjected to reduced pressure treatment or heat treatment in an inert gas atmosphere at a temperature of 250 ° C., or those that have reduced the content of oligomers and acetaldehyde which are low molecular weight polymers by solid-phase polymerization are suitable.

In the polyester resin, additives such as stabilizers, pigments, antioxidants, heat deterioration inhibitors, UV deterioration inhibitors, antistatic agents, antibacterial agents, and other resins can be added in appropriate amounts.

The bottom reinforced plastic bottle using the above-mentioned resin can be easily manufactured by a known biaxial stretch blow molding method using a mold having a shape capable of forming the bottom reinforced portion.

Although the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to this and various modifications can be made without departing from the spirit of the present invention. For example, the shape, installation position, arrangement method, and the like of the bottom reinforcing portion can be appropriately changed in consideration of the size, shape, application, appearance, and the like of the bottle.

[0018]

As described in detail above, according to the present invention, a plurality of bottom reinforcing portions including concave portions and / or convex portions are provided in the circumferential direction near the lower end of the bottom wall surface of the plastic bottle. The bottom of the bottle is significantly reinforced.

The bottle of the present invention as described above is suitable for bottles of various beverages, particularly bottles of hot fill, juice subjected to pasteurizing by hot shower, carbonated beverages and the like.

[Brief description of drawings]

FIG. 1 is a front view showing a bottom reinforced plastic bottle according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... Bottle 2 ... Mouth 3 ... Shoulder 4 ... Body 5 ... Bottom 51 ... Bottom Reinforcement 6 ... Panel 7, 8 ... Transverse Groove

Claims (2)

[Claims] 1. A plastic bottle comprising a mouth portion, a shoulder portion, a body portion and a bottom portion, wherein a plurality of bottom reinforcing portions each having a concave portion and / or a convex portion are provided in the circumferential direction near a lower end of a wall surface of the bottom portion. Bottom reinforced plastic bottle characterized by being 2. The bottom-reinforced plastic bottle according to claim 1, wherein each of the bottom-reinforcing parts has a longitudinal length of 10 to 90% of a height of a side surface of the bottom of the bottle and an entire circumference of the bottom of the bottle. A bottom reinforced plastic bottle having a width of 0.5 to 90%.