JP5789440B2 - 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.

JP 2010-126184 A

  However, the conventional bottle has room for improvement with respect to improving the vacuum absorption performance in the bottle.

  Therefore, the present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a bottle capable of improving the vacuum absorption performance in the bottle.

In order to achieve the above object, the present invention provides the following means.
(1) A bottle according to the present invention is a bottle formed of a synthetic resin material in a bottomed cylindrical shape, wherein a bottom wall portion of the bottom portion is positioned on an outer peripheral edge portion, and a bottle diameter is provided on the grounding portion. A rising peripheral wall portion extending from the inner side in the direction and extending upward; an annular movable wall portion projecting inward from the upper end portion of the rising peripheral wall portion toward the inner side in the bottle radial direction; A depressed peripheral wall portion extending upward from the end portion, and the movable wall portion gradually extends downward from the upper end portion of the rising peripheral wall portion toward the inside in the bottle radial direction, and the depressed peripheral wall portion So that the rising peripheral wall portion moves from the grounding portion toward the connecting portion with the movable wall portion. Gradual bottle radial direction Extends so as to incline toward the side, the rising peripheral wall portion, the longitudinal rib which is open towards the and upper recess toward the inside of the bottle radial direction are more formed along the bottle circumferential direction It is characterized by.

  According to the bottle of the present invention, when the inside of the bottle is depressurized, the depressed peripheral wall portion moves upward by the rotation of the movable wall portion, so that the depressurization can be absorbed. By the way, the movable wall portion rotates around the connecting portion with the rising peripheral wall portion, coupled with the diameter expansion or contraction of the rising peripheral wall portion due to the movement of the upper end portion of the rising peripheral wall portion in the bottle radial direction. Conceivable.

Here, in the rising peripheral wall portion of the present invention, a plurality of concave vertical ribs that are open upward are formed along the bottle circumferential direction, so that the upper end side can easily move flexibly in the bottle radial direction. Therefore, the movable wall portion can be easily rotated downward when filling the contents, and the volume in the bottle can be increased to increase the vacuum absorption capacity immediately after filling. Therefore, the reduced pressure absorption performance can be improved.
That is, the movable wall portion deformed downward when the contents are filled moves inward of the bottle in a reduced pressure state generated after sealing and cooling. Since this large amount of movement can be ensured, the vacuum absorption capacity can be increased.
In addition, even after filling the contents, the upper end of the rising peripheral wall is easy to move flexibly in the bottle radial direction, so that the movable wall can be flexibly rotated while following the internal pressure change in the bottle with good sensitivity. Can do. Also in this point, the reduced pressure absorption performance can be improved.

(2) In the bottle according to the present invention, the vertical rib has a peripheral length of the rising peripheral wall portion of 1.05 to 1.3 relative to a peripheral length of the rising peripheral wall portion when the vertical rib is not formed. It is preferably formed so as to be within a double range.

  In this case, since a plurality of vertical ribs are formed with an appropriate number, rib width, and the like on the rising peripheral wall portion so that the peripheral length of the rising peripheral wall portion falls within the above range, it is easy to form a bottle. It is possible to improve the reduced pressure absorption performance by stably moving the upper end portion of the rising peripheral wall portion in the bottle radial direction while securing the property.

  According to the bottle according to the present invention, the reduced-pressure absorption performance in the bottle can be improved.

It is a front view of the bottle in the embodiment of the present invention. It is a longitudinal cross-sectional view of the bottom part vicinity of the bottle shown in FIG. It is a cross-sectional view of the bottle along the AA line shown in FIG.

Hereinafter, bottles according to embodiments of the present invention will be described with reference to the drawings.
(Composition of bottle)
As shown in FIG. 1, the bottle 1 according to the present embodiment includes a mouth portion 11, a shoulder portion 12, a trunk portion 13, and a bottom portion 14, and these are arranged in this order in a state where their respective central axes are located on a common axis. It is set as the general | schematic structure connected continuously.

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 bottle circumferential direction.
The bottle 1 is formed by blow molding a preform formed into a bottomed cylinder by injection molding, and is integrally formed of a synthetic resin material. A cap (not shown) is screwed into the mouth portion 11. Further, the mouth portion 11, the shoulder portion 12, the trunk portion 13, and the bottom portion 14 each have a circular cross-sectional view shape orthogonal to the bottle axis O.

Between the shoulder part 12 and the trunk | drum 13, the 1st annular groove 15 is formed continuously over the perimeter.
The body portion 13 is formed in a cylindrical shape and has a smaller diameter than a lower end portion of the shoulder portion 12 and a heel portion 17 described later of the bottom portion 14. A plurality of second annular grooves 16 are formed in the body portion 13 at intervals in the bottle axis O direction. In the illustrated example, five second annular grooves 16 are formed at equal intervals in the bottle axis O direction. Each of these second annular grooves 16 is a groove formed continuously over the entire circumference of the body portion 13.

  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, and a bottom wall portion 19 that closes the lower end opening portion of the heel portion 17 and whose outer peripheral edge portion is a grounding portion 18. Are formed in a cup shape.

  Of the heel portion 17, a heel lower end portion 27 connected to the ground contact portion 18 from the outside in the bottle radial direction is formed to have a smaller diameter than an upper heel portion 28 connected to the heel lower end portion 27 from above. The upper heel portion 28 is the maximum outer diameter portion of the bottle 1 together with the lower end portion of the shoulder portion 12.

  Further, the connecting portion 29 between the heel lower end portion 27 and the upper heel portion 28 is gradually reduced in diameter from the upper side toward the lower side, whereby the heel lower end portion 27 has a smaller diameter than the upper heel portion 28. Further, in the upper heel portion 28, for example, a plurality of third annular grooves 20 having substantially the same depth as the first annular grooves 15 are formed continuously over the entire circumference. In the illustrated example, two third annular grooves 20 are formed at an interval in the bottle axis O direction.

  As shown in FIG. 2, 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 extends upward from the upper end portion of the rising peripheral wall portion 21 toward the inside in the bottle radial direction. And an annular movable wall portion 22 that protrudes upward, and a depressed peripheral wall portion 23 that extends upward from the inner end portion of the movable wall portion 22 in the bottle radial direction.

  The movable wall portion 22 is formed in a curved shape protruding downward, 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. The movable wall portion 22 is rotatable around the curved surface portion (connection portion with the rising peripheral wall portion 21) 25 so as to move the depressed peripheral wall portion 23 upward.

  The rising peripheral wall portion 21 is gradually reduced in diameter from the lower side toward the upper side. Specifically, as it goes from the grounding portion 18 toward the curved surface portion 25 that is a connecting portion with the movable wall portion 22, the bottle portion gradually inclines at an inclination angle θ with respect to the bottle axis O toward the inner side in the bottle radial direction. It is extended.

  Further, as shown in FIGS. 2 and 3, a plurality of vertical ribs 30 are formed on the rising peripheral wall portion 21 of the present embodiment at regular intervals along the bottle circumferential direction over the entire circumference. . These vertical ribs 30 are concave ribs that are recessed toward the inside in the bottle radial direction, and extend from the ground contact portion 18 to the curved surface portion 25 that is the connecting portion with the movable wall portion 22 (the rising height of the rising peripheral wall portion 21). Over the entire length). At this time, since these vertical ribs 30 are formed up to the curved surface portion 25, they are opened upward.

The depressed peripheral wall portion 23 is disposed coaxially with the bottle axis O, and is formed in a circular shape in a cross-sectional view that gradually increases in diameter from the upper side toward the lower side. A disc-shaped top wall 24 disposed coaxially with the bottle axis O is connected to the upper end portion of the depressed peripheral wall portion 23, and the entire depressed peripheral wall portion 23 and the top wall 24 form a top tube shape. Yes.
The depressed peripheral wall portion 23 includes a curved wall portion 23 a that is formed in a curved shape protruding toward the inside in the bottle radial direction, and whose upper end portion is connected to the outer peripheral edge portion of the top wall 24. The curved wall portion 23a is connected to the inner end portion of the movable wall portion 22 in the bottle radial direction via a curved surface portion 26 having a lower end projecting downward.

(Bottle action)
When the inside of the bottle 1 configured as described above is depressurized, the movable wall portion 22 lifts the depressed peripheral wall portion 23 upward by rotating the movable wall portion 22 upward about the curved surface portion 25. To move. That is, the inner wall pressure change (decompression) of the bottle 1 can be absorbed by positively deforming the bottom wall portion 19 of the bottle 1 during decompression.

  In particular, at the time of decompression, the movable wall portion 22 rotates around the curved surface portion 25 together with the diameter expansion or contraction of the rising peripheral wall portion 21 due to the upper end portion of the rising peripheral wall portion 21 moving in the bottle radial direction. It is considered a thing. At this time, since a plurality of vertical ribs 30 that are open upward are formed in the bottle circumferential direction on the rising peripheral wall portion 21 of the present embodiment, the upper end side (the curved surface portion 25 side) is in the bottle radial direction. Flexible and easy to move. Therefore, the movable wall portion 22 can be easily rotated downward when filling the contents, and the volume in the bottle 1 can be increased to increase the reduced pressure absorption capacity immediately after filling. Therefore, the reduced pressure absorption performance can be improved.

  In addition, since the movable wall portion 22 of the present embodiment gradually extends downward from the curved surface portion 25 toward the inner side in the bottle radial direction, the movable wall portion 22 is directed downward at the time of filling. It is easy to rotate, and it is easy to effectively improve the reduced pressure absorption performance.

  In addition, even after filling the contents, the upper end of the rising peripheral wall portion 21 easily moves flexibly in the bottle radial direction, so that the movable wall portion 22 can be flexibly rotated while following the internal pressure change in the bottle 1 with high sensitivity. Can be moved. Also in this point, the reduced pressure absorption performance can be improved.

  Further, the bottle 1 of the present embodiment has an inner volume of 1 liter or less and a grounding diameter of 85 mm or less, and is used when filling contents at 80 to 100 ° C. (preferably 85 to 93 ° C.), for example. Although it is suitable for (a so-called heat-resistant bottle), it can also be used for a bottle filled with contents at 75 ° C. or less (more specifically, a temperature range of 60 to 75 ° C.).

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the rising peripheral wall portion 21 is formed so as to be gradually inclined inward in the bottle radial direction from the grounding portion 18 toward the curved surface portion 25, but is perpendicular to the curved surface portion 25 from the grounding portion 18. It may be formed so as to stand up. However, it is preferable that the rising peripheral wall portion 21 is inclined as in the above embodiment.
Moreover, although the several vertical rib 30 was formed at equal intervals over the perimeter of the standing | starting-up surrounding wall part 21, even if it is not equal intervals, what is necessary is just to be formed in multiple numbers along the bottle peripheral direction. At this time, it may be formed at intervals along the circumferential direction of the bottle, or may be formed continuously. However, it is preferable to form the vertical ribs 30 at equal intervals along the bottle circumferential direction because the upper end portion of the rising peripheral wall portion 21 can be easily moved in the bottle radial direction over the entire circumference.

  Further, although the vertical rib 30 is formed from the ground contact portion 18 of the rising peripheral wall portion 21 to the curved surface portion 25, it may be open upward, and the vertical rib 30 may be formed only on the curved surface portion 25 side. good. Even in this case, the upper end portion of the rising peripheral wall portion 21 can be flexibly moved in the bottle radial direction.

Further, the number of the vertical ribs 30, the depth of the vertical ribs 30, the rib interval between the vertical ribs 30 adjacent to each other in the bottle circumferential direction, and the like may be determined according to the size and height of the rising peripheral wall portion 21. .
In particular, the peripheral length (length in the bottle circumferential direction) of the rising peripheral wall portion 21 including the vertical rib 30 is 1.05 to 1.3 relative to the peripheral length when the vertical rib 30 is not formed. The vertical ribs 30 are preferably formed so as to be within the double range. By doing so, it is possible to stably move the upper end portion of the rising peripheral wall portion 21 in the bottle radial direction while improving the moldability of the bottle 1 and to improve the reduced pressure absorption performance. This point will be described in detail in an embodiment described later.

  Moreover, in the said embodiment, you may change suitably, such as making the movable wall part 22 project in parallel along a bottle radial direction, or making it incline upwards, and it is a flat shape or the concave recessed upwards. You may change suitably, such as forming in a curved surface form.

  Moreover, in the said embodiment, although the cross-sectional view shape orthogonal to each bottle axis | shaft O of the shoulder part 12, the trunk | drum 13, and the bottom part 14 was made into circular shape, it changes suitably, for example not only to this but to polygonal shape You may do it.

  The synthetic resin material forming the bottle 1 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material thereof. Further, 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 absorption property.

(Example)
Next, the peripheral length of the rising peripheral wall portion 21 including the vertical ribs 30 is changed by changing the combination of the number of the vertical ribs 30, the rib width, the rib interval, and the like, and the upper end of the rising peripheral wall portion 21 is filled when the contents are filled. An example in which the part changes in the bottle diameter direction is tested (analyzed).

In this test, the rising peripheral wall portion in the case where the vertical ribs 30 were not formed was used as a reference model, and the test results were evaluated by making a comparison with this reference model.
As the rising peripheral wall portion used as the reference model, the one that is inclined at an inclination angle θ gradually toward the inner side in the bottle radial direction from the grounding portion 18 toward the curved surface portion 25 as in the above embodiment. . At this time, the inclination angle θ was set to 5.2 degrees.
Further, the length in the bottle circumferential direction at the central portion in the vertical direction of the rising peripheral wall portion 21 is set as the circumferential length. Further, the height from the ground contact surface to the uppermost portion of the curved surface portion 25 is 7.7 mm.

In this test, the following four patterns were tested.
In addition, although the vertical rib employ | adopts that a cross section is a semicircular arc shape, it can also be set as another shape (V shape, trapezoid shape, etc.).
(1) In the first pattern, vertical ribs 30 having a depth of 0.3 mm and a rib width of 0.6 mm are formed on the rising peripheral wall portion of the above-described reference model at intervals of 4 degrees around the bottle axis O. 90 were formed. The circumference in this case was 107.5% when the circumference in the reference model was 100%.
(2) In the second pattern, the vertical ribs 30 having a depth of 0.7 mm and a rib width of 1.4 mm are formed on the rising peripheral wall portion of the above-mentioned reference model at intervals of 12 degrees around the bottle axis O. 30 were used. The circumference in this case was 108.9% when the circumference in the reference model was 100%.
(3) In the third pattern, vertical ribs 30 having a depth of 0.7 mm and a rib width of 1.4 mm are formed on the rising peripheral wall portion of the above-described reference model at intervals of 6 degrees around the bottle axis O. The one formed by 60 was adopted. The circumference in this case was 117.8% when the circumference in the reference model was 100%.
(4) In the fourth pattern, vertical ribs 30 having a depth of 0.7 mm and a rib width of 1.4 mm are formed on the rising peripheral wall portion of the above-described reference model at intervals of 4 degrees around the bottle axis O. 90 were formed. The circumference in this case was 126.7% when the circumference in the reference model was 100%.

Then, a predetermined internal pressure (0.5 kg / cm ² (49 Kpa)) was applied to the bottle 1 having the reference model and the above-described four patterns of the rising peripheral wall portion 21 assuming the filling of the contents. Then, in any bottle 1, the movable wall portion 22 pivoted downward about the curved surface portion 25, and the upper end portion of the rising peripheral wall portion 21 moved toward the inside in the bottle radial direction. That is, the rising peripheral wall portion 21 was deformed so that the inclination angle θ was larger than 5.2 degrees.

  The tilt angle θ after the deformation is 8.2 degrees in the reference model, 8.7 degrees in the first pattern, 8.9 degrees in the second pattern, and 9.4 degrees in the third pattern. It was 9.5 degrees in the fourth pattern.

From these results, it is confirmed that the rising peripheral wall portion 21 can be inclined at a larger inclination angle θ when the vertical ribs 30 are formed, for example, when the contents are filled, than when the vertical ribs 30 are not formed. did it. That is, it was confirmed that the upper end side of the rising peripheral wall portion 21 can be flexibly moved in the bottle radial direction and the movable wall portion 22 can be rotated downward. In particular, it was confirmed that the above effect becomes more remarkable as the circumference ratio increases.
Further, the peripheral length of the rising peripheral wall portion 21 on which the vertical rib 30 is formed is equal to the rising peripheral wall portion 21 when the vertical rib 30 is not formed (reference model) regardless of the depth, rib width, number of ribs, and rib interval. It was confirmed that the film had the above effect if it was formed so as to be within the range of 1.05 to 1.3 times the circumference of.

  Even when the longitudinal ribs 30 are formed, it is considered difficult to expect the above effect if the circumference is smaller than 1.05 times the circumference of the reference model. Further, when the circumference is larger than 1.3 times the circumference of the reference model, it is considered that no further improvement effect can be obtained (equilibrium state). In addition, in order to increase the circumference, it is necessary to form more vertical ribs 30 and the like, which makes it difficult to form and is not practical.

O ... bottle shaft 1 ... bottle 14 ... bottom 18 ... grounding part 19 ... bottom wall part 21 ... rising peripheral wall part 22 ... movable wall part 23 ... depressed peripheral wall part 25 ... curved surface part (with movable wall part and rising peripheral wall part Connection part)
30 ... Vertical rib

Claims (2)

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 gradually extends downward from the upper end portion of the rising peripheral wall portion toward the inside in the bottle radial direction, and is arranged so as to move the depressed peripheral wall portion upward. It is arranged to be rotatable around the connection part,
The rising peripheral wall portion extends so as to incline gradually toward the inner side in the bottle radial direction from the grounding portion toward the connecting portion with the movable wall portion,
A bottle characterized in that a plurality of vertical ribs that are recessed toward the inside in the bottle radial direction and opened upward are formed in the rising peripheral wall portion along the bottle circumferential direction. The bottle according to claim 1,
The vertical rib is formed such that the peripheral length of the rising peripheral wall portion is within a range of 1.05 to 1.3 times the peripheral length of the rising peripheral wall portion when the vertical rib is not formed. Bottle characterized by being.

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