JP2019182502A - Pet bottle - Google Patents

Abstract

To provide a pet bottle which is excellent in design, and of which a bottom center portion never falls.SOLUTION: A pet-bottle 10 comprises an opening portion 12, a drum portion 11, a shoulder portion 13, and a bottom portion 20, and the drum portion 11 is formed to a flat shape without a pressure absorption panel. A circumferential boundary portion 23 between a circumferential ground portion 21 of the bottom portion 20 and the drum portion 11 inclines with a slope angle of 0-30° to a ground face 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a warming PET bottle, and more particularly, to a PET bottle that is excellent in design and has a bottom center portion that does not drop.

  2. Description of the Related Art Conventionally, as a heating PET bottle placed on a grounding surface, a bottle having a mouth, a trunk, a shoulder, and a bottom is known. Such a heating PET bottle is heated by a heating vending machine or the like, and the internal pressure increases. However, in order to absorb the internal pressure due to the heating, a plurality of planar pressure absorption panels are provided in the body portion. .

  However, in a plastic bottle having a pressure absorbing panel, the contents are not easily seen from the outside by the pressure absorbing panel.

  There is also a problem that the pressure absorbing panel makes it difficult to attach a label to the outer surface of the body of the PET bottle.

  In such a case, it may be possible to remove the flat pressure absorbing panel from the body of the PET bottle, but if the pressure absorbing panel is removed, there is also a problem that the inner pressure rises during heating and the bottom center part falls. is there.

JP 2010-228816 A

  The present invention has been made in consideration of such points, and for heating, the pressure absorbing panel can be removed from the trunk, and the center of the bottom does not drop even if the internal pressure rises during heating. The purpose is to provide plastic bottles.

  The present invention relates to a heating cylindrical PET bottle placed on a ground surface, a mouth portion, a body portion connected to the mouth portion via a shoulder portion, and a bottom portion connected to the body portion The body portion does not have a pressure absorbing panel, the surface is smoothed as a whole, has a flat shape without irregularities, and the bottom portion is a circumferential grounding portion that contacts the grounding surface. A center part of the bottom provided at the center of the circumferential grounding part and projecting upward; and a circumferential boundary part that forms a boundary between the circumferential grounding part and the body part, and the circumferential shape The boundary portion is a plastic bottle that is inclined in a range of 0 to 30 ° with respect to the ground contact surface.

  The present invention is a plastic bottle in which a circumferential label guard that is recessed inward from the other part of the body part is provided in a central part excluding an upper part and a lower part of the body part.

  This invention is a PET bottle whose height from the said grounding surface of the said bottom part center part is 10-30 mm.

  As described above, according to the present invention, the barrel portion of the PET bottle does not have a pressure absorbing panel and has a flat shape as a whole, so that the contents can be easily exposed to the outside, and the PET The internal pressure of the bottle can be effectively absorbed by the circumferential boundary.

FIG. 1 is a side view showing a plastic bottle according to the first embodiment. FIG. 2A shows a plastic bottle according to the present invention. FIG. 2B shows a plastic bottle according to the present invention. FIG. 2C is a view showing a plastic bottle as a comparative example. FIG. 3 is a view showing a plastic bottle placed on a hot plate in the embodiment. FIG. 4 is an external side view showing the plastic bottle according to the first embodiment. FIG. 5 is a perspective view showing a plastic bottle according to the first embodiment. FIG. 6 is a bottom view showing the plastic bottle according to the first embodiment. FIG. 7 is a side view showing a plastic bottle according to the second embodiment.

<First Embodiment>
The first embodiment of the present invention will be described below with reference to the drawings.

  Here, FIG. 1 to FIG. 6 are diagrams showing a first embodiment of the present invention.

  First, an outline of a heating PET bottle will be described with reference to FIGS. As shown in FIGS. 4 to 6, a heating PET bottle (hereinafter also simply referred to as a PET bottle) 10 is a test tube preform 2 made of polyethylene terephthalate (PET) manufactured by an injection molding method or the like. Consists of bottles made by axial stretch blow molding. Such a PET bottle 10 is mounted on the grounding surface 30 (refer FIG. 1) which consists of heating surfaces, such as a heating vending machine, and is heated by heating surfaces, such as this heating vending machine.

  Such a plastic bottle 10 has a cylindrical shape as a whole, a mouth part 12 having an external screw 12a and a support ring 12b, a body part 11 connected to the mouth part 12 via a shoulder part 13, and a body part 11 The bottom part 20 is connected to the lower part of the container, and is made of PET (polyethylene terephthalate) as a whole.

  Here, the trunk portion 11 has a flat shape as a whole without having a pressure absorbing panel formed in a flat shape.

  In the present specification, “upward” and “downward” mean “upward” and “downward” when the plastic bottle 10 is erected in the state of FIG. 4 (see FIG. 4). Further, the “flat shape” means a shape having a smooth surface and no irregular shape, and includes both a flat surface and a bay surface.

  Further, the bottom portion 20 is provided with a circumferential ground portion 21 that is grounded to the ground plane 30, a bottom center portion 22 that is provided at the center of the circumferential ground portion 21 and protrudes upward, the circumferential ground portion 21, and the trunk portion 11. And a circumferential boundary 23 forming a boundary between the two.

  Further, the bottom central portion 22 is provided with five protruding portions 25 protruding outward at the lower portion thereof, and each protruding portion 25 extends from the circumferential boundary portion 23 toward the upper upper end portion 22a. . The five projecting portions 25 strengthen the bottom central portion 22 of the bottom portion 20.

  The total length H of the plastic bottle shown in FIG. 1 is 120 to 210 mm, and the height H1 from the ground contact surface 30 to the upper end portion of the bottom center portion 22 is 10 to 30 mm. Moreover, the diameter D of the trunk | drum 11 is 52-75 mm.

  Next, the structure of the bottom 20 will be further described with reference to FIG.

  As shown in FIG. 1, the circumferential ground portion 21 of the bottom portion 20 is grounded to the ground plane 30, and the circumferential boundary portion 23 formed between the circumferential ground portion 21 and the trunk portion 11 is Inclined with respect to the ground plane 30 at an inclination angle θ.

  The inclination angle θ of the circumferential boundary 23 is 0 ° to 30 °, preferably 3 ° to 20 °.

  The PET bottle 10 is placed on a heating surface such as a heating vending machine constituting the ground surface 30 and is heated together with contents such as water. When the PET bottle 10 is heated, the internal pressure increases. Since the trunk | drum 11 of the PET bottle 10 does not have a pressure absorption panel, if the internal pressure of the PET bottle 10 rises, the raised internal pressure will be added to the bottom part 20 side.

  In this case, the circumferential boundary portion 23 of the bottom portion 20 is outwardly outward from the trunk portion 11 via a circumferential bent portion P between the trunk portion 11 and the circumferential boundary portion 23 (see FIG. 1 is bent and deformed (in the direction of arrow L). In this way, the circumferential boundary 23 is bent outward and deformed, whereby the internal volume of the PET bottle 10 is increased and the internal pressure in the PET bottle 10 can be absorbed.

  By the way, when the inclination angle θ of the circumferential boundary portion 23 is small, for example, when the inclination angle θ is near 0 °, the force working downward from the inside of the PET bottle 10 to the circumferential boundary portion 23 becomes large. The circumferential boundary portion 23 is easily bent downward and deformed via the circumferential bent portion P.

  On the other hand, when the inclination angle θ of the circumferential boundary portion 23 is large, for example, when θ exceeds 30 °, the force acting downward from the inside of the PET bottle 10 to the circumferential boundary portion 23 is reduced, It becomes difficult to deform the circumferential boundary 23 downward and outward. When the circumferential boundary portion 23 does not deform downward and outward, the internal pressure in the PET bottle 10 is directed toward the bottom central portion 22, the bottom central portion 22 is pressed downward, and the bottom central portion 22 is downward. It protrudes toward the ground surface 30 in some cases. When the bottom center portion 22 is in contact with the ground plane 30 in this manner, a phenomenon (buckling) in which the PET bottle 10 becomes unstable on the ground plane 30 occurs.

  From the above, the inclination angle of the circumferential boundary portion 23 of the bottom portion 20 is set to 0 ° to 30 ° as described above.

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

  First, the above-described plastic bottle 10 is prepared, contents (water) are put into the plastic bottle 10, and a cap 15 (see FIG. 3) is attached to the mouth portion 12.

  Next, the plastic bottle 10 containing the contents is placed on a heating surface (grounding surface) 30 of a heating vending machine or the like, and the plastic bottle 10 is heated by the heating surface. At this time, the circumferential boundary portion 23 of the bottom portion 20 is bent downward and outward (in the direction of the arrow L) via the circumferential bent portion P and deformed. Thereby, the internal volume in the PET bottle 10 increases, and the increase in the internal pressure in the PET bottle 10 can be effectively absorbed by the circumferential boundary portion 23.

  Moreover, since the trunk | drum 11 of the PET bottle 10 does not have a pressure absorption panel, and has comprised flat shape as a whole, the contents can be easily exposed outward and the PET bottle 10 excellent in design property can be obtained. Can be provided. Further, the label can be easily attached to the body portion 11 of the plastic bottle 10.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment shown in FIG. 7, the body portion 11 of the plastic bottle 10 is recessed inward from the other portions of the body portion 11 in the central portion except for the upper portion 17 a and the lower portion 17 b of the body portion 11. A circumferential label guard 17 that protects a label (not shown) to be attached is provided.

  The other configuration shown in FIG. 7 is substantially the same as that of the first embodiment shown in FIGS. 1 and 4 to 6.

  In the second embodiment shown in FIG. 7, the same parts as those in the first embodiment shown in FIGS. 1 and 4 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 7, by providing a circumferential label guard 17 that is recessed inwardly from the other part at the central portion of the body portion 11, a label can be attached to the body portion 11 on the circumferential label guard 17. it can. Further, the label guard 17 that is recessed inward from other portions can prevent the label surface from being scratched.

  In FIG. 7 as well, when the PET bottle 10 is heated, the circumferential boundary 23 of the bottom 20 is bent and deformed downward (in the direction of the arrow L) via the circumferential bent portion P. To do. Thereby, the internal volume in the PET bottle 10 increases, and the increase in internal pressure in the PET bottle 10 can be effectively absorbed by the circumferential boundary portion 23.

  Moreover, since the trunk | drum 11 of the PET bottle 10 does not have a pressure absorption panel and is made into the flat shape as a whole, the content can be easily exposed to the outside and the PET bottle 10 excellent in design property can be obtained. Can be provided. Further, the label can be easily attached to the body portion 11 of the plastic bottle 10.

  Next, specific examples of the present invention will be described with reference to FIGS. 2A, 2B, 2C and 3. FIG. This example corresponds to the first embodiment described above.

  First, the PET bottle 10 described in the first embodiment was produced by biaxial stretch blow molding using a PET 22g preform. The total length H of the plastic bottle 10 is 132 mm, and the diameter D of the body 11 is 66 mm.

  Next, water was filled into the PET bottle 10 from the upper end of the mouth 12 to a position 25 mm below, and the cap 15 was attached to the mouth 12.

  Next, as shown in FIG. 3, the plastic bottle 10 filled with water was placed on the heating surface 30 of the hot plate (EC-1200N) manufactured by AS ONE Corporation as a severe test at the time of heating sales.

  The hot plate was operated to heat the warming surface 30 of the hot plate until the set temperature reached 180 ° C.

  In this case, as the PET bottle 10 according to the present invention, the PET bottle 10 (see FIG. 2A) whose inclination angle θ of the circumferential boundary portion 23 of the bottom portion 20 is 0 ° and the inclination angle of the circumferential boundary portion 23 of the bottom portion 20. A PET bottle 10 (see FIG. 2B) having θ of 30 ° was prepared.

  At the same time, a PET bottle 10 (see FIG. 2C) in which the inclination angle θ of the circumferential boundary 23 of the bottom 20 is 60 ° was prepared as a PET bottle 10 according to the comparative example.

  At this time, whether or not the buckling phenomenon in which the bottom center portion 22 of the bottom portion 20 of the plastic bottle 10 protrudes downward and comes into contact with the warming surface 30 occurs is placed on the warming surface 30. It was evaluated along with the elapsed time.

  The evaluation results are shown in Table 1.

表１において、バックリング現象が生じていない状態を「○」として示し、バックリング現象が生じた状態を「×」として示す。

In Table 1, a state where the buckling phenomenon does not occur is indicated as “◯”, and a state where the buckling phenomenon occurs is indicated as “x”.

  As can be seen from Table 1, when the inclination angle θ of the circumferential boundary 23 of the bottom portion 20 is 0 to 30 °, it takes a long time until the buckling phenomenon occurs compared to the case where the inclination angle θ is 60 °. As can be seen, when the inclination angle θ is 0 to 30 °, the bottom 20 is not deformed, and the increase in the internal pressure can be effectively absorbed.

DESCRIPTION OF SYMBOLS 10 Plastic bottle 11 Trunk part 12 Mouth part 13 Shoulder part 17 Circumferential label guard 20 Bottom part 21 Circumferential ground part 22 Bottom center part 23 Circumferential boundary part 30 Ground surface

Claims (3)

In the cylindrical plastic bottle for heating placed on the ground surface,
The mouth,
A trunk connected to the mouth via a shoulder;
A bottom connected to the body,
The barrel does not have a pressure absorbing panel, the surface is smoothed as a whole, and has a flat shape without irregularities,
The bottom is a circumferential grounding portion that is grounded to the grounding surface, a bottom central portion that is provided at the center of the circumferential grounding portion and protrudes upward, and a boundary between the circumferential grounding portion and the trunk portion. A circumferential boundary portion formed,
The said circumferential boundary part is a PET bottle which inclines in the range of 0-30 degrees with respect to the said ground-contact plane.   The PET bottle according to claim 1, wherein a circumferential label guard that is recessed inward from the other part of the body part is provided in a central part excluding the upper part and the lower part of the body part.   The plastic bottle according to claim 1 or 2, wherein a height of the bottom center portion from the ground contact surface is 10 to 30 mm.

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