JP6012406B2 - Bottle - Google Patents

Description

  The present invention relates to a bottle.

  Conventionally, as a bottle formed into a bottomed cylindrical shape with a synthetic resin material, for example, as shown in Patent Document 1 below, the bottom wall portion of the bottom portion is connected to a grounding portion located on the outer peripheral edge portion, and the grounding portion. A rising peripheral wall portion extending from the inside in the bottle radial direction and extending upward; a movable wall portion protruding from the upper end portion of the rising peripheral wall portion toward the inside in the bottle radial direction; and an inner portion of the movable wall portion in the bottle radial direction. A bottle by rotating around a connecting portion with the rising peripheral wall so that the movable wall moves the depressed peripheral wall upward. A configuration that absorbs the reduced pressure inside is known. Further, the bottom portion is provided with a heel portion that extends from the outside in the bottle radial direction to the grounding portion and extends upward.

International Publication No. 2010/061758

  However, in the conventional bottle, there is room for improvement in providing the bottom wall portion with good decompression absorption performance while maintaining the rigidity of the ground contact portion and the rising peripheral wall portion.

  Therefore, the present invention has been made in view of such circumstances, and the object thereof is to allow the bottom wall portion to have good decompression absorption performance while maintaining the rigidity of the grounding portion and the rising peripheral wall portion. Is to provide a bottle.

  In order to solve the above problems and achieve such an object, the bottle of the present invention is a bottle formed of a synthetic resin material into a bottomed cylindrical shape, and the bottom wall portion of the bottom portion is an outer peripheral edge portion. A grounding portion located at the top, a rising peripheral wall portion connected to the grounding portion from the inner side in the bottle radial direction and extending upward, and an annular movable wall protruding from the upper end of the rising peripheral wall portion toward the inner side in the bottle radial direction And a depressed peripheral wall portion extending upward from an inner end portion in the bottle radial direction of the movable wall portion, and the movable wall portion has the depressed peripheral wall portion centered on a connection portion with the rising peripheral wall portion. The bottom portion includes a heel portion extending from the outside in the bottle radial direction and extending upward to the grounding portion, and the outer diameter of the heel portion with respect to the weight of the bottom wall portion. Is 28 (mm / g) or more Characterized in that it becomes 8 (mm / g) or less.

According to this invention, since the ratio of the outer diameter of the heel portion to the weight of the bottom wall portion is 28 (mm / g) or more and 48 (mm / g) or less, the rigidity of the ground contact portion and the rising peripheral wall portion is increased. It is possible to provide the bottom wall with good reduced pressure absorption performance while maintaining.
That is, when the ratio of the outer diameter of the heel portion to the weight of the bottom wall portion is less than 28 (mm / g), the weight of the bottom wall portion becomes too large with respect to the outer diameter of the heel portion, and the movable wall is reduced during decompression. And the depressed peripheral wall portion are difficult to move upward, and the bottom wall portion cannot exhibit the reduced pressure absorption performance well, and the ratio of the outer diameter of the heel portion to the weight of the bottom wall portion is 48 ( If it exceeds (mm / g), the weight of the bottom wall portion becomes too small relative to the outer diameter of the heel portion, and the rigidity of the ground contact portion and the rising peripheral wall portion is insufficient. Due to the axial force applied in the compression direction, the ground contact portion and the rising peripheral wall portion may be deformed, and the total height of the bottle may be lowered, or the bottle may roll over.
In addition, since the bottom wall portion is configured as described above, for example, when high-temperature contents are filled, the movable wall portion is directed downward together with the depressed peripheral wall portion around the connection portion with the rising peripheral wall portion. In addition, during cooling in a sealed state, the movable wall portion moves upward together with the depressed peripheral wall portion around the connection portion with the rising peripheral wall portion.

  According to the bottle according to the present invention, the bottom wall portion can be provided with a good decompression absorption performance while maintaining the rigidity of the ground contact portion and the rising peripheral wall portion.

It is a side view of the bottle shown as one embodiment concerning the present invention. It is a bottom view of the bottle shown in FIG. FIG. 3 is a cross-sectional view of the bottle shown in FIG. It is a graph which shows the verification test result of the bottle which concerns on the Example of this invention, and the bottle which concerns on the comparative example of this invention.

Hereinafter, bottles according to embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the bottle 1 according to the present embodiment includes a mouth part 11, a shoulder part 12, a body part 13, and a bottom part 14, and these are located in a state where their central axes are located on a common axis. It is set as the schematic structure connected in order.
Hereinafter, the common axis is referred to as a bottle axis O, and the mouth 11 side is referred to as the upper side and the bottom 14 side is referred to as the lower side along the bottle axis O direction. A direction perpendicular to the bottle axis O is referred to as a bottle radial direction, and a direction around the bottle axis O is referred to as a circumferential direction.

The bottle 1 is integrally formed of a synthetic resin material such as polyethylene terephthalate. The bottle 1 is formed, for example, by biaxial stretch blow molding. Furthermore, this bottle 1 may be used as a so-called heat-resistant bottle filled with the content of 80 to 100 ° C. (preferably 83 to 93 ° C.), or filled with the content of about 60 to 78 ° C. You may use for.
The mouth portion 11 is formed in a cylindrical shape, and a cap (not shown) is attached to the mouth portion 11. Further, each of the mouth part 11, the shoulder part 12, the body part 13, and the bottom part 14 has a circular cross-sectional view perpendicular to the bottle axis O.

The shoulder 12 is connected to the lower end of the mouth 11 and gradually increases in diameter as it goes downward.
The trunk portion 13 is formed in a cylindrical shape and extends downward from the lower end of the shoulder portion 12. Of the body portion 13, an intermediate portion 13 c between both end portions 13 a and 13 b in the bottle axis O direction has a smaller diameter than these both end portions 13 a and 13 b. A first end groove 27 and a second end groove 28 that extend continuously over the entire circumference are formed in both end portions 13 a and 13 b of the body portion 13, respectively. In the example shown in the drawing, the first end groove 27 formed in the upper end portion 13 a of the body portion 13 is larger in both the groove width and depth than the second end groove 28 formed in the lower end portion 13 b of the body portion 13. ing.

  In the intermediate portion 13c of the body portion 13, a plurality of circumferential grooves 16 extending continuously over the entire circumference are formed at intervals in the bottle axis O direction. In the illustrated example, the circumferential groove 16 is larger in both the groove width and depth than the first end groove 27 and the second end groove 28. The plurality of circumferential grooves 16 are arranged at intervals in the bottle axis O direction over the entire region in the bottle axis O direction of the intermediate portion 13 c of the body portion 13.

  The bottom portion 14 is connected to the lower end of the body portion 13 and is formed in a cup shape that closes the lower end opening of the body portion 13. Specifically, the bottom portion 14 has a heel portion 17 whose upper end opening is connected to the lower end opening portion of the body portion 13, a lower end opening portion of the heel portion 17 is closed, and an outer peripheral edge portion is a grounding portion 18. And a bottom wall portion 19.

  The heel portion 17 is formed with an annular groove 17 a that continuously extends over the entire circumference and that has both a groove width and a depth smaller than the circumferential groove 16. On the outer peripheral surface of the heel portion 17 and the outer peripheral surface of the lower end portion 13b of the body portion 13, an uneven portion 17b having a low protruding height is formed by, for example, embossing. Thereby, in the filling process, when a large number of bottles 1 are transported, the outer peripheral surfaces of the heel portions 17 of the adjacent bottles 1 and the outer peripheral surfaces of the lower end portion 13b of the barrel portion 13 are in close contact with each other. Therefore, it is possible to suppress the slippage and to prevent the occurrence of so-called blocking. In the example shown in the drawing, the concavo-convex portion 17b is also formed on each surface of the second end groove 28 and the annular groove 17a.

  2 and 3, the bottom wall portion 19 is connected to the ground contact portion 18 from the inside in the bottle radial direction and extends upward, and from the upper end portion of the rising peripheral wall portion 21 in the bottle radial direction. An annular movable wall portion 22 projecting inward, and a depressed peripheral wall portion 23 extending upward from an inner end portion of the movable wall portion 22 in the bottle radial direction, the movable wall portion 22 being depressed In order to move the peripheral wall portion 23 in the bottle axis O direction, the peripheral wall portion 23 is rotatably arranged around a curved surface portion (a connection portion with the rising peripheral wall portion 21) described later.

The movable wall portion 22 is disposed coaxially with the bottle axis O, and gradually extends downward from the outside in the bottle radial direction toward the inside. The movable wall portion 22 and the rising peripheral wall portion 21 are connected via a curved surface portion 25 that protrudes upward.
In addition, a plurality of ribs 41 are radially arranged around the bottle axis O on the movable wall portion 22. The rib 41 has a configuration in which a plurality of concave portions 41a that are recessed in a curved shape upward are intermittently disposed along the bottle radial direction.

The depressed peripheral wall portion 23 is disposed coaxially with the bottle axis O, is connected to the inner end portion of the movable wall portion 22 in the bottle radial direction, and is gradually reduced in diameter from the lower side toward the upper side. Further, the depressed peripheral wall portion 23 is formed in a top tube shape and includes a top wall 24 orthogonal to the bottle axis O. The depressed peripheral wall portion 23 and the movable wall portion 22 are connected via a curved surface portion 26 that protrudes downward.
By forming a plurality of projecting portions 23d projecting inward in the bottle radial direction on the depressed peripheral wall portion 23, the bottom view shape is between the projecting portions 23d adjacent to each other in the circumferential direction. A rectangular tube portion 23f having a polygonal shape having an intermediate portion 23e at a corner portion and an overhang portion 23d at a side portion is formed.

In the illustrated example, the rectangular tube portion 23f is formed over substantially the entire length of the depressed peripheral wall portion 23 in the bottle axis O direction. As shown in FIG. 2, a plurality of the overhang portions 23d are arranged on the depressed peripheral wall portion 23 at intervals in the circumferential direction. Three projecting portions 23d are formed on the depressed peripheral wall portion 23, and the bottom-view shape of the rectangular tube portion 23f is an equilateral triangle.
In the vertical cross-sectional view of the rectangular tube portion 23f as shown in FIG. 3, the overhang portion 23d is formed in a curved surface protruding toward the inside in the bottle radial direction, and the intermediate portion 23e is formed from the overhang portion 23d. A curved surface with a large curvature radius or a flat surface inclined with respect to the bottle axis O is formed.
In the bottom view of the rectangular tube portion 23f, as shown in FIG. 2, the intermediate portion 23e and the overhang portion 23d are each formed in a curved shape protruding toward the outside in the bottle radial direction, and the intermediate portion 23e The perimeter is shorter than the perimeter of the overhang 23d.

  In this embodiment, the ratio of the outer diameter A of the lower end portion 17c of the heel portion 17 to the weight of the bottom wall portion 19 is 28 (mm / g) or more and 48 (mm / g) or less. The lower end portion 17c of the heel portion 17 is connected to the ground contact portion 18 of the bottom wall portion 19 from the outside in the bottle radial direction and extends upward. The outer diameter A of the lower end portion 17c of the heel portion 17 is equal to the outer diameter of the intermediate portion 13c of the trunk portion 13.

  As described above, according to the bottle 1 according to the present embodiment, the ratio of the outer diameter A of the lower end portion 17c of the heel portion 17 to the weight of the bottom wall portion 19 is 28 (mm / g) or more and 48 (mm / g). ) As described below, the bottom wall portion 19 can be provided with good decompression absorption performance while maintaining the rigidity of the ground contact portion 18 and the rising peripheral wall portion 21.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The change etc. of the range which does not deviate from the summary of this invention are included.

For example, in the above-described embodiment, the rectangular cylindrical portion 23f is formed in the depressed peripheral wall portion 23, but the rectangular cylindrical portion 23f may not be formed.
Further, the uneven portion 17 b may not be formed on the outer peripheral surface of the heel portion 17 and the outer peripheral surface of the lower end portion 13 b of the trunk portion 13.
The rising peripheral wall 21 may be appropriately changed, for example, extending in parallel along the bottle axis O direction, or extending so as to be inclined with respect to the bottle axis O.
The movable wall portion 22 may be appropriately changed, for example, by protruding in parallel along the bottle radial direction.

The synthetic resin material forming the bottle 1 is not limited to polyethylene terephthalate, but may be appropriately changed, for example, polyethylene naphthalate, amorphous polyester, or a blend material thereof.
The bottle 1 is not limited to a single layer structure, and may be a laminated structure having an intermediate layer. Examples of the intermediate layer include a layer made of a resin material having a gas barrier property, a layer made of a recycled material, or a layer made of a resin material having an oxygen absorbing property.
In the embodiment described above, the cross-sectional view shape orthogonal to the bottle axis O of each of the shoulder portion 12, the trunk portion 13, and the bottom portion 14 is a circular shape. Also good.

 In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modification examples may be appropriately combined.

  Next, a verification test for the above-described effects will be described.

First, five types of bottles 1 that differ only in the weight of the bottom wall portion 19 are formed, and each of the bottles 1 is placed in the states 1 to 6 as shown on the horizontal axis of FIG. The distance in the bottle axis O direction from the top wall 24 of the depressed peripheral wall portion 23 was measured.
The number of grams shown in FIG. 4 indicates the weight of the bottom wall portion 19. Moreover, the outer diameter A of the lower end part 17c of the heel part 17 of all the five types of bottles 1 was set to about 70.5 mm. Furthermore, state 1 shown on the horizontal axis is an empty state before filling the contents, state 2 is when 5 minutes have elapsed after filling and sealing the contents at 70 ° C., and state 3 is The state 4 is a state immediately after a 50 ° C. hot water shower is applied for 10 minutes after the state 2, the state 4 is a state after the state 3 is naturally cooled at room temperature and becomes the same temperature as the room temperature, and the state 5 is the state 4 After cooling to 5 ° C., state 6 shows when bottle 1 is opened after state 5.
As a result, when the bottle 1 is filled with high-temperature contents (state 2), the distance becomes smaller than when empty (state 1), and then the temperature gradually decreases with the bottle 1 sealed (state) 3 to 5), it was confirmed that the distance was increased, and finally, when the bottle 1 was opened (state 6), the distance was decreased.
That is, as the pressure in the bottle 1 is reduced, the movable wall portion 22 rotates around the curved surface portion 25 so as to move the depressed peripheral wall portion 23 upward, while moving along with an increase in the internal pressure of the bottle 1. It has been confirmed that the wall portion 22 rotates around the curved surface portion 25 so as to move the depressed peripheral wall portion 23 downward.

Next, 11 types of bottles 1 as shown in Table 1 are formed, and the absorption capacity at the time of decompression is measured for each bottle 1, and the grounding portion 18 and the rising peripheral wall portion 21 against the axial force in the compression direction are measured. The strength was evaluated. In Example 2 and Example 4, only the form of the circumferential groove 16 formed in the body part 13 is different to the extent that the reduced pressure absorption performance is not affected.
The vacuum absorption capacity was measured as follows.
First, the heated contents are filled into the bottle 1 and sealed, and after about 5 minutes, the contents are opened and all contents are discharged. Next, in a state where the bottle 1 is filled with water and sealed, for example, 1 ml is discharged until the body 13 having a circular shape in cross section is deformed into an elliptical shape. The absorption capacity was measured by measuring the amount.
Further, the strength was evaluated based on whether or not the bottle 1 substantially contracted and deformed in the axial direction when an axial force of about 400 N was applied to each bottle 1 in the compression direction.
The results are shown in Table 1.

As a result, if the ratio of the outer diameter A of the lower end portion 17c of the heel portion 17 to the weight of the bottom wall portion 19 is 28 (mm / g) or more and 48 (mm / g) or less, it is about 400 N in the compression direction. The bottle 1 is not substantially contracted and deformed in the axial direction even when an axial force is applied, and the absorption capacity is 4% or more of the inner capacity of the bottle 1, that is, the rigidity of the grounding portion 18 and the rising peripheral wall portion 21 is increased. It was confirmed that the bottom wall portion 19 can exhibit the reduced pressure absorption performance satisfactorily while maintaining.
When the ratio of the outer diameter A of the lower end portion 17c of the heel portion 17 to the weight of the bottom wall portion 19 is less than 28 (mm / g), the absorption capacity becomes less than 4% of the inner volume of the bottle 1, and the bottom wall It was confirmed that the part 19 is difficult to exhibit the reduced pressure absorption performance well.

DESCRIPTION OF SYMBOLS 1 Bottle 14 Bottom part 17 Heel part 18 Grounding part 19 Bottom wall part 21 Standing surrounding wall part 22 Movable wall part 23 Depression surrounding wall part 25 Curved surface part (connection part)
A Outer diameter

Claims (1)

A bottle formed of a synthetic resin material in a bottomed cylindrical shape,
The bottom wall of the bottom
A grounding portion located at the outer periphery,
A rising peripheral wall portion extending from the inside in the bottle radial direction to the grounding portion and extending upward;
An annular movable wall portion projecting inward from the upper end portion of the rising peripheral wall portion in the bottle radial direction;
A depressed peripheral wall portion extending upward from an inner end portion in the bottle radial direction of the movable wall portion,
The movable wall portion is disposed so as to be movable upward together with the depressed peripheral wall portion around a connection portion with the rising peripheral wall portion,
The bottom portion includes a heel portion extending from the outside in the bottle radial direction to the grounding portion and extending upward.
The ratio of the outer diameter of the said heel part with respect to the weight of the said bottom wall part is 28 (mm / g) or more and 48 (mm / g) or less, The bottle characterized by the above-mentioned.

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