JP2018020810A - Pressure reduction absorption bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a pressure reduction absorption performance while suppressing occurrence of a bottom fall.SOLUTION: A bottle 1 is formed into a bottomed cylindrical shape and formed of a synthetic resin material. A bottom wall part 16 of a bottom part 5 comprises: a grounding part 30 positioned on an outer peripheral edge part; a standing peripheral wall part 31 continuous to the grounding part from inside of a bottle diameter direction and extending upward; and a movable wall part 32 extending from an upper end part of the standing peripheral wall part to inside of the bottle diameter direction, and movable upward with a connection part with the standing peripheral wall part as a center. The movable wall part has plural ribs 40. A ratio of a plane area of the ribs for a prescribed plane area of the movable wall part is smaller on an inside area 32b positioned on inside of the bottle diameter direction, than on an outside area 32a positioned on outside of the bottle diameter direction, on the movable wall part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bottle.

Conventionally, for example, as shown in Patent Document 1 below, the bottom wall portion of the bottom portion is a grounding portion located at the outer peripheral edge portion, and a rising peripheral wall portion that extends from the inside in the bottle radial direction to the grounding portion and extends upward. A bottomed cylindrical bottle including a movable wall portion extending from the upper end portion of the rising peripheral wall portion toward the inside in the bottle radial direction is known.
In this bottle, the movable wall portion rises and moves (rotates) upward about the connecting portion with the peripheral wall portion, thereby absorbing the reduced pressure in the bottle. Further, by forming a plurality of ribs on the movable wall portion, the pressure receiving area of the movable wall portion is increased, and the movable wall portion is moved so as to respond quickly to changes in the internal pressure of the bottle.

JP 2012-91860 A

However, in the above-described conventional bottle, for example, when the contents are filled or the internal pressure of the bottle is increased, the movable wall portion rises and moves downward around the connecting portion with the peripheral wall portion, and a part of the movable wall portion is the grounding portion. There is a possibility that so-called bottom-down, in which the grounding stability is hindered, is caused by reaching the arrangement position or projecting downward from the grounding part.
In particular, the inner area (inner end side) of the movable wall portion in the bottle radial direction is close to the ground contact surface, and therefore, it easily reaches the position where the ground contact portion is disposed or protrudes downward from the ground contact portion.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bottle capable of ensuring reduced pressure absorption performance while suppressing the occurrence of bottoming.

(1) The bottle according to the present invention is a bottle formed of a synthetic resin material in a bottomed cylindrical shape, and the bottom wall portion of the bottom portion is a grounding portion located at the outer peripheral edge portion, and the diameter of the bottle in the grounding portion. A rising peripheral wall portion extending from the inside in the direction and extending upward, and extending from the upper end portion of the rising peripheral wall portion toward the inner side in the bottle radial direction, and freely movable upward around the connecting portion with the rising peripheral wall portion A plurality of ribs are formed on the movable wall portion, and the ratio of the flat area of the rib to the predetermined flat area of the movable wall portion is determined by the movable wall. The inner region located on the inner side in the bottle radial direction is smaller than the outer region located on the outer side in the bottle radial direction.

According to the bottle of the present invention, since the plurality of ribs are formed on the movable wall portion, the surface area of the movable wall portion can be increased, and the pressure receiving area in the movable wall portion can be increased. Therefore, in response to the change in the internal pressure of the bottle, the movable wall portion can be deformed so as to move (turn) upward with the connecting portion with the peripheral wall portion as a center. Thereby, the reduced pressure absorption performance of the bottle can be improved.
In particular, the ratio of the plurality of ribs formed on the movable wall portion is made different between the outer region (outer edge side) and the inner region (inner edge side) of the movable wall portion, and the outer region than the inner region of the movable wall portion. A plurality of ribs are densely arranged. Therefore, it is possible to suppress an increase in the surface area in the inner region of the movable wall portion while increasing the surface area of the entire movable wall portion.
Therefore, for example, when the contents are filled, the inner region of the movable wall portion arranged at a position close to the bottle axial direction with respect to the grounding portion moves downward around the connection portion between the movable wall portion and the rising peripheral wall portion. This can be suppressed. Thereby, it is possible to make it difficult for the bottom to fall.

(2) The ribs are disposed at intervals along the bottle radial direction across the outer region and the inner region, and a plurality of first ribs disposed at intervals in the bottle circumferential direction. And a plurality of second rib rows disposed between the first rib rows adjacent to each other in the bottle circumferential direction, and arranged at intervals along the bottle radial direction in the outer region, May be provided.

In this case, the plurality of first rib rows can be arranged radially around the bottle axis over the entire movable wall portion (over the outer region and the inner region), and in the outer region of the movable wall portion. The plurality of second rib rows can be arranged radially. Therefore, the ratio of the plurality of ribs formed on the movable wall portion can be reliably made different between the outer region and the inner region by using the second rib row, and the outer region is more than the inner region of the movable wall portion. A plurality of ribs can be arranged densely. In particular, since the ratio of the ribs can be changed by a simple operation of simply forming the second rib row in the outer region of the movable wall portion, the bottle can be manufactured efficiently.
Moreover, since both the first rib row and the second rib row can be radially arranged, the plurality of ribs can be evenly arranged in a balanced manner in the bottle circumferential direction. Therefore, the movable wall portion can be uniformly deformed, and the reduced pressure absorption performance can be easily improved.

(3) The ribs may be equally formed in size and shape.

  In this case, after unifying the size and shape of the ribs, the proportion of the ribs can be made different between the outer region and the inner region of the movable wall portion by utilizing the rib arrangement balance. Therefore, for example, it is easy to produce a molding die for molding a rib and the like because there is no need to consider the size and shape of the rib.

  According to the bottle according to the present invention, it is possible to ensure the reduced pressure absorption performance while suppressing the occurrence of bottoming out.

It is a side view which shows embodiment of the bottle which concerns on this invention. It is a bottom view of the bottle shown in FIG. It is a longitudinal cross-sectional view of the bottle along the AA line shown in FIG. FIG. 4 is an enlarged view of a portion B shown in FIG. 3. It is the top view seen from the arrow C direction shown in FIG.

Hereinafter, an embodiment of a bottle according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1-3, the bottle 1 of this embodiment is provided with the opening part 2, the shoulder part 3, the trunk | drum 4, and the bottom part 5, and these have located each center axis line on the common axis Therefore, the configuration is such that they are arranged in this order.

  Hereinafter, the above-described common axis is referred to as a bottle axis O, and the mouth 2 side is referred to as the upper side and the bottom 5 side is referred to as the lower side along the bottle axis O direction. Further, in a plan view viewed from the bottle axis O direction, a direction orthogonal to the bottle axis O is referred to as a radial direction (bottle radial direction), and a direction around the bottle axis O is referred to as a circumferential direction (bottle circumferential direction).

  The bottle 1 is a synthetic resin bottle formed by blow molding including, for example, extrusion blow molding using a parison or biaxial stretch blow molding using a preform formed in a bottomed cylindrical shape.

Note that. Examples of the synthetic resin include polyethylene terephthalate (PET), polyethylene naphthalate, amorphous polyester, and blended materials thereof. However, the bottle 1 of this embodiment is not limited to the case of being formed of one type of synthetic resin, and may be formed by laminating different types of synthetic resins.
For example, the bottle 1 may be formed by laminating two types of synthetic resins, a main material resin and a barrier resin. In this case, examples of the main material resin include resins such as the above-described PET. In addition, the barrier resin has a barrier property that regulates, for example, that gas (oxygen, carbon dioxide, etc.), moisture such as moisture, light such as ultraviolet rays, and odor components such as fragrance pass through the main resin. It is resin which is suitably selected according to the target object to be barriered. For example, when a gas barrier property is exhibited, a nylon-based resin or an ethylene vinyl alcohol copolymer resin can be used, and when a moisture barrier property is exhibited, a cyclic polyolefin-based resin can be cited.

The mouth part 2, the shoulder part 3, the body part 4, and the bottom part 5 have, for example, circular shapes in cross-sectional view orthogonal to the bottle axis O, respectively. A cap (not shown) is attached to the mouth portion 2. A first annular concave groove 10 is continuously formed over the entire circumference at the connection portion between the shoulder portion 3 and the body portion 4.
The body portion 4 is formed in a cylindrical shape, and a portion between both end portions in the bottle axis O direction is formed to have a smaller diameter than these both end portions. In the body portion 4, a plurality of second annular grooves 11 are continuously formed over the entire circumference at intervals in the bottle axis O direction. In the illustrated example, the second annular grooves 11 are arranged at equal intervals in the bottle axis O direction.

A third annular groove 13 is continuously formed over the entire circumference at the connecting portion between the body portion 4 and the bottom portion 5.
The bottom portion 5 includes a heel portion 15 whose upper end opening is connected to the lower end opening of the body portion 4, and a bottom wall portion 16 that closes the lower end opening of the heel portion 15 and whose outer peripheral edge portion is a grounding portion 30. Are formed in a cup shape.

Of the heel portion 15, the lower heel portion 17 that is continuous with the ground contact portion 30 from the outside in the radial direction is formed to have a smaller diameter than the upper heel portion 18 that is continuous with the lower heel portion 17 from above. The upper heel portion 18 is the maximum outer diameter portion of the bottle 1 together with both end portions of the body portion 4 in the bottle axis O direction.
The connecting portion 19 between the lower heel portion 17 and the upper heel portion 18 is gradually reduced in diameter from the upper side toward the lower side. Thus, the lower heel portion 17 has a smaller diameter than the upper heel portion 18. In the upper heel portion 18, a fourth annular groove 20 having a depth equivalent to that of the third annular groove 13 is continuously formed over the entire circumference.

  The first annular groove 10, the second annular groove 11, the third annular groove 13, and the fourth annular groove 20 described above are not essential and may not be provided. Further, the number and depth of each of the concave grooves 10, 11, 13, 20 may be changed as appropriate.

  Note that, for example, uneven portions that roughen the outer peripheral surface may be formed on the outer peripheral surface of the heel portion 15 and the outer peripheral surface of the lower end portion of the body portion 4. By forming the concavo-convex part, in the filling process of the contents, for example, when a large number of bottles 1 are transported, the outer peripheral surfaces of the heel parts 15 of the adjacent bottles 1 and the lower end part of the body part 4 Since the outer peripheral surfaces are in close contact with each other, it becomes difficult to slip, so that the occurrence of so-called blocking can be suppressed.

As shown in FIGS. 2 and 3, the bottom wall portion 16 is connected to the grounding portion 30 from the inside in the radial direction and extends upward, and from the upper end portion of the rising peripheral wall portion 31 to the inside in the radial direction. An annular movable wall portion 32 extending toward the center and a bottom center portion 33 that is continuous with the movable wall portion 32 from the inside in the radial direction are provided.
The movable wall portion 32 and the bottom center portion 33 are disposed inside the rising peripheral wall portion 31 in the radial direction, and close the upper end opening of the rising peripheral wall portion 31.

The rising peripheral wall portion 31 is slightly reduced in diameter from the lower side toward the upper side.
The movable wall portion 32 is formed in a curved surface shape that protrudes downward as a whole. In the illustrated example, the movable wall 32 extends gradually downward from the outer end connected to the upper end of the rising peripheral wall 31 toward the inside in the radial direction, and then curves upward. As it goes to the inner end connected to the bottom center portion 33, it gradually extends upward. The movable wall portion 32 and the rising peripheral wall portion 31 are connected to each other via a curved surface portion 36 that protrudes upward.

The movable wall portion 32 thus configured has a bottle axis centered on the curved surface portion 36 (the connecting portion between the movable wall portion 32 and the rising peripheral wall portion 31) so that the bottom center portion 33 is moved upward. It is movable (rotatable) in the O direction.
The movable wall 32 is disposed above the ground plane G with a gap in the bottle axis O direction between the movable wall section 32 and the ground plane G to which the ground section 30 is grounded.

  The bottom center portion 33 is disposed coaxially with the bottle axis O and is disposed above the inner end portion of the movable wall portion 32. The bottom center portion 33 includes a cylindrical depressed peripheral wall portion 37 extending upward from the inner end portion of the movable wall portion 32, a disk-shaped top wall portion 38 connected to the upper end portion of the depressed peripheral wall portion 37, It is formed in the top cylinder shape provided with.

The depressed peripheral wall portion 37 has a first inclined cylinder portion 37a that gradually decreases in diameter as it goes upward from the inner end portion of the movable wall portion 32, and a gradually reduced diameter as it goes upward from the upper end portion of the first inclined cylinder portion 37a. And a second inclined cylinder part 37b connected to the outer peripheral edge part of the top wall part 38.
However, the shape of the depressed peripheral wall portion 37 is not limited to this case, and may be freely changed.

  However, the shape of the bottom center portion 33 is not limited to the shape having the depressed peripheral wall portion 37 as described above and bulging so as to protrude upward, for example, a flat shape perpendicular to the bottle axis O direction. It may be a shape that is slightly curved upward or downward, and is curved so as to follow the curvature of the movable wall portion 32, and is formed so as to be positioned on the virtual curved surface of the movable wall portion 32. It doesn't matter.

In the movable wall portion 32 described above, a plurality of ribs 40 are formed over the entire area of the movable wall portion 32.
The plurality of ribs 40 are formed by an outer region (outer edge portion side) 32a located on the radially outer side of the movable wall portion 32 and an inner region (inner end portion side) 32b located on the radially inner side. Are formed differently.

The outer region 32a of the movable wall portion 32 refers to a portion that is mainly disposed on the outer side in the radial direction with respect to the substantially central portion in the radial direction of the movable wall portion 32, and the inner region 32b. Means a portion mainly arranged on the inner side in the radial direction than the central portion.
In the present embodiment, a portion of the movable wall portion 32 that extends downward from the curved surface portion 36 in the radial direction is defined as the outer region 32a, and the remaining portion other than the outer region 32a of the movable wall portion 32 is defined as the inner region. 32b. The radial length of the outer region 32a is longer (for example, about twice as long) than the radial length of the inner region 32b.

The plurality of ribs 40 are formed such that the ratio of the flat area of the ribs 40 per predetermined flat area of the movable wall portion 32 is smaller in the inner region 32b than in the outer region 32a.
The flat area of the rib 40 means an opening area S of the rib 40 when the movable wall portion 32 is viewed in a plan view from a direction orthogonal to the movable wall portion 32 as shown in FIGS. 4 and 5. The ratio of the flat area of the rib 40 to the predetermined flat area of the movable wall portion 32 is the ratio of the ribs 40 arranged in the predetermined flat area of the movable wall portion 32 as shown in FIGS. The ratio of the total area SA of the flat area S is said. Further, the plane area of the movable wall portion 32 refers to the plane area of the entire movable wall portion 32 including the total area SA of all the ribs 40 formed on the movable wall portion 32.

  In the present embodiment, since the movable wall portion 32 is not excessively inclined with respect to the horizontal plane, the plan view viewed from the direction orthogonal to the bottle axis O is from the direction orthogonal to the movable wall portion 32. The drawing approximates the plan view. Therefore, as shown in FIG. 2, the plurality of ribs 40 are arranged more densely in the outer region 32 a than in the inner region 32 b of the movable wall portion 32.

  As shown in FIGS. 2 to 5, the plurality of ribs 40 are equally formed in size and shape. In the example shown in the drawing, the plurality of ribs 40 are formed so as to be recessed upward from the movable wall portion 32, and are formed in a spherical shape convex toward the upper side of the inner surface 40a. Accordingly, the plurality of ribs 40 have the same plane area S.

  Specifically, the plurality of ribs 40 are arranged at intervals along the radial direction across the outer region 32a and the inner region 32b, and a plurality of first rib rows arranged at intervals in the circumferential direction. 41 and a plurality of second rib rows 42 disposed between the first rib rows 41 adjacent to each other in the circumferential direction and spaced apart from each other in the radial direction in the outer region 32a. ing.

  The first rib row 41 is formed, for example, by arranging seven ribs 40 with a constant interval (radial pitch P1) in the radial direction, and with a constant interval (circumferential pitch P2) in the circumferential direction, for example. By arranging with a gap, they are arranged radially around the bottle axis O.

  The second rib row 42 is formed by arranging five ribs 40 at the same radial pitch P1 as the first rib row 41 in the radial direction, and the same as the first rib row 41 in the circumferential direction, for example. It arrange | positions radially centering | focusing on the bottle axis | shaft O by arrange | positioning so that it may be located between the 1st rib row | line | columns 41 adjacent to the circumferential direction at intervals in the circumferential direction.

  As described above, in the present embodiment, the plurality of ribs 40 are arranged more densely in the outer region 32a than in the inner region 32b by using the second rib row 42 formed in the outer region 32a of the movable wall portion 32. Yes. The number of ribs 40 in the first rib row 41, the number of ribs 40 in the second rib row 42, the radial pitch P1 and the circumferential pitch P2 are appropriately determined according to, for example, the diameter of the bottle 1 and the diameter of the rib 40. You can change it.

  For example, when the diameter of the upper end portion of the rising peripheral wall portion 31 is around 60 mm, the rib 40 is hemispherical with a diameter of 2.2 mm, and the circumferential pitch P2 of the rib 40 arranged on the outermost peripheral side is about 3.9 mm. Thus, the ribs 40 can be provided in an arrangement pattern as shown in FIGS.

In addition, the rib 40 of this embodiment is shape | molded using the projection pin of the shaping | molding die of the same shape and the same size, respectively, The basic shape is made into the hemisphere of diameter 2.2mm. As a result, the plurality of ribs 40 have the same size and shape.
However, each rib 40 is formed on the movable wall portion 32 through an annular connection region that surrounds the rib 40 and protrudes downward in the molding, for example, the appearance of the rib 40 positioned on the outermost periphery side. The upper opening diameter (opening diameter including the connection region) is 3.7 mm. In addition, the part which overlaps with a connection area | region adjacent to an adjacent connection area | region becomes large as it goes inside radial direction. Therefore, the apparent opening diameter of the rib 40 becomes smaller toward the inner side in the radial direction. In FIG. 2, the connection region is not shown in order to make the drawing easy to see. Therefore, FIG. 2 shows a case where all the ribs 40 are formed in the same size as the basic shape.

(Bottle action)
When the inside of the bottle 1 configured as described above is in a depressurized state, the movable wall portion 32 moves (rotates) upward about the curved surface portion 36, so that the movable wall portion 32 moves away from the depressed peripheral wall portion 37. Then, the entire bottom center portion 33 is moved upward. Thereby, the bottom wall part 16 of the bottle 1 can be positively deformed at the time of decompression, and the internal pressure change (decompression) of the bottle 1 can be absorbed without the deformation of the body part 4 and the like.
At this time, since the connecting portion between the rising peripheral wall portion 31 and the movable wall portion 32 is a curved surface portion 36 that protrudes upward, the movable wall portion 32 can be easily moved.

  Moreover, since the some rib 40 is formed in the movable wall part 32, the surface area of the movable wall part 32 can be increased, and the pressure receiving area in the movable wall part 32 can be increased. Therefore, in response to the change in the internal pressure of the bottle 1, the movable wall portion 32 can be deformed so as to rise and move upward with the connection portion with the peripheral wall portion 31 as the center. Thereby, the reduced pressure absorption performance of the bottle 1 can be improved.

  In particular, since the plurality of ribs 40 are densely arranged in the outer region 32a than the inner region 32b of the movable wall portion 32, the inner region of the movable wall portion 32 is increased while the surface area of the entire movable wall portion 32 is increased. An increase in surface area at 32b can be suppressed. Therefore, for example, when the contents are filled, the inner region 32b of the movable wall portion 32 arranged at a position near the bottle axis O direction with respect to the grounding portion 30 serves as a connection portion between the movable wall portion 32 and the rising peripheral wall portion 31. Moving downward to the center can be suppressed. Thereby, it is possible to make it difficult for the bottom to fall.

Therefore, according to the bottle 1 of the present embodiment, it is possible to ensure the reduced pressure absorption performance while suppressing the occurrence of bottoming out.
In addition, since the ratio of the plurality of ribs 40 formed on the movable wall portion 32 can be reliably varied between the outer region 32a and the inner region 32b using the second rib row 42, The plurality of ribs 40 can be more densely arranged in the outer region 32a than in the inner region 32b. Thus, since the ratio of the ribs 40 can be changed by a simple operation of simply forming the second rib row 42 in the outer region 32a of the movable wall portion 32, the bottle 1 can be manufactured efficiently.

In addition, since both the first rib row 41 and the second rib row 42 are formed radially, the plurality of ribs 40 can be arranged evenly in a balanced manner in the circumferential direction. Therefore, the movable wall portion 32 can be uniformly deformed and the reduced pressure absorption performance can be easily improved.
Moreover, since the sizes and shapes of the ribs 40 are unified, for example, a molding die for forming the ribs 40 can be easily produced because the size and shape of the ribs 40 are not taken into consideration.

  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 said embodiment, although the some rib 40 was formed by arrange | positioning the 1st rib row | line | column 41 and the 2nd rib row | line | column 42 radially, it is not limited to this case. The ribs 40 need only be densely arranged in the outer region 32a than the inner region 32b of the movable wall portion 32, and the arrangement balance of the ribs 40, the size and shape of the ribs 40, and the like may be freely changed.

  Moreover, in the said embodiment, although the shape of the shoulder part 3, the trunk | drum 4, and the bottom part 5 was each made circular shape by cross-sectional view, it is not limited to this case, For example, you may make it elliptical or polygonal shape. . Further, the rising peripheral wall portion 31 may be extended in parallel along the bottle axis O direction, for example, and may be changed as appropriate. Furthermore, the movable wall portion 32 may be formed so as to gradually extend downward or upward as it goes from the radially outer side to the radially inner side, or may be formed to extend along the radial direction. I do not care.

O ... Bottle shaft 1 ... Bottle 2 ... Mouth part 3 ... Shoulder part 4 ... Body part 5 ... Bottom part 16 ... Bottom wall part 30 ... Grounding part 31 ... Standing peripheral wall part 32 ... Movable wall part 32a ... Outside area 32b of movable wall part ... Inner region of movable wall 40 ... Rib 41 ... First rib row 42 ... Second rib row

Claims (3)

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,
A movable wall portion extending from the upper end portion of the rising peripheral wall portion toward the inner side in the bottle radial direction and movably disposed upward about a connection portion with the rising peripheral wall portion;
A plurality of ribs are formed on the movable wall portion,
The ratio of the flat area of the rib to the predetermined flat area of the movable wall portion is the ratio of the inner region located inside the bottle radial direction to the outer region located outside the bottle radial direction in the movable wall portion. The bottle is smaller. The bottle according to claim 1,
The rib is
A plurality of first rib rows arranged at intervals along the bottle radial direction across the outer region and the inner region, and arranged at intervals in the bottle circumferential direction,
A plurality of second rib rows arranged between the first rib rows adjacent to each other in the bottle circumferential direction, and arranged at intervals along the bottle radial direction in the outer region. There is a bottle. In the bottle according to claim 1 or 2,
The said rib is a bottle in which size and a shape are each formed equally.

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