JP2007030974A - Bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottle which maintains a high buckling strength to improve stiffness against dent or the like. <P>SOLUTION: At least one part of the part along the extending direction of a pillar section 13b formed on a barrel section 13 in an annular recessed channel 16, 17 is defined as a reinforcing rib section 18 and the part except the reinforcing rib section 18 is defined as a reinforcing channel section 18b which has a bigger depth in the inward diameter direction than that of the reinforcing rib section 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bottle filled with, for example, a beverage.

  As this type of bottle, for example, as shown in Patent Document 1 below, a heel portion having a bottom portion, a body portion connected to an upper end portion of the heel portion, and an upper end portion of the body portion are provided. The shoulder portion is gradually reduced in diameter as it goes upward, and the mouth portion is connected to the upper end portion of the shoulder portion and extends upward, and has a substantially circular cross section. A plurality of panel portions that are recessed inward in the radial direction are formed in a circumferential direction via pillar portions extending in the direction of the central axis of the circle formed by the transverse section, and a connecting portion between the heel portion and the body portion, and the body There is known a configuration in which at least one of the connecting portions between the portion and the shoulder portion is an annular groove extending over the entire circumference.

  Here, the annular groove is formed in order to prevent deformation such as a dent in the bottle due to the radially inward force acting on the bottle, that is, to increase the rigidity against the dent. Yes.

  In addition, when such a force acts on a bottle, for example, when a plurality of bottles are transported in a state of being coupled before packing, when adjacent bottles collide or press each other, After filling and sealing the contents of the bottle, if this bottle is cooled, the inside of the bottle is depressurized, or in a vending machine, it is dropped with the bottle lying on its side from the stock to the outlet. And the like.

By the way, in such a bottle, there is an increasing demand for improvement in shape quality such that a dent or the like does not occur due to the collision or the like. Particularly in recent years, it has been desired to reduce the amount of resin used, that is, to reduce the weight of the container in consideration of environmental problems. Furthermore, there is a demand for providing such a lighter bottle with rigidity equal to or higher than that of the conventional product.
JP 2002-293315 A

  However, in the conventional bottle, in order to further improve the rigidity, if the amount of dent toward the radially inner side of the annular groove is increased, the extending direction of the column portion of the annular groove is As a result, the stress tends to concentrate on the portion along the line and the buckling strength is lowered, and there is a limit in increasing the rigidity. Moreover, this tendency becomes strong with the weight reduction of the bottle.

  The present invention has been made in consideration of such circumstances, and provides a bottle that can maintain buckling strength at a high level and improve rigidity against dents and the like without reducing moldability. With the goal.

  In order to solve the above-described problems and achieve such an object, the bottle of the present invention includes a heel portion having a bottom portion, a barrel portion connected to an upper end portion of the heel portion, and an upper end portion of the barrel portion. A shoulder portion that is continuously connected to the portion and gradually reduced in diameter as it goes upward, and a mouth portion that is continuously connected to the upper end portion of the shoulder portion and extends upward, and has a substantially circular cross section. A plurality of panel portions that are recessed inward in the radial direction are formed in the body portion in the circumferential direction via pillar portions extending in the direction of the central axis of the circle formed by the transverse section, and the heel portion and the body portion At least one of the connecting portion and the connecting portion between the body portion and the shoulder portion is a bottle that is an annular groove extending over the entire circumference, and the column portion of the annular groove is At least a part of the portion along the extending direction of the is a reinforcing rib portion, and the portion excluding the reinforcing rib portion is Characterized in that it is largely been reinforced groove recessed amount toward the radially inward than strong ribs.

  In this invention, since the said reinforcing groove part is provided in the annular groove, the rigidity of the bottle with respect to a dent etc. is improved, and since the reinforcing rib part is provided, it suppresses that buckling strength falls. Therefore, it is possible to provide a bottle with improved rigidity against a dent or the like while maintaining a high buckling strength.

Here, the reinforcing rib portion may have a V shape in which a plan view of the transverse section is convex outward in the radial direction of the bottle.
In this case, it becomes possible to suppress the proportion of the volume occupied by the reinforcing rib portion with a small amount of dent in the annular groove, and by providing the reinforcing rib portion, improvement in rigidity against the dent or the like is hindered. Can be suppressed.

  Moreover, the distance from the said central axis in the edge part of the said panel part and the deepest part of the said reinforcement groove part may be made equivalent.

In this case, the buckling strength of the bottle can be improved.
That is, when the end portion of the panel portion is positioned radially inward from the reinforcing groove portion, when the compressive force in the central axis direction is applied, the end portion of the body portion is placed in the central axis direction of the panel portion. As a result, a moment is generated so as to cover the end portion of the material, and the buckling strength is reduced. On the other hand, when the reinforcing groove portion is positioned radially inward from the panel portion, a moment that is crushed in the central axis direction is generated in the reinforcing groove portion when the compressive force is applied. As a result, the buckling strength is reduced.

  Furthermore, the distance from the said central axis of the said pillar part and the said reinforcement rib part may be made equivalent.

In this case, the buckling strength of the bottle can be improved.
That is, when the column portion is positioned radially inward from the reinforcing rib portion, when the compressive force in the central axis direction is applied, the end portion of the column portion in the central axis direction is applied to the end portion of the trunk portion. As a result, a moment that covers the surface is generated, and the buckling strength is reduced. On the other hand, if the reinforcing rib portion is positioned radially inward from the column portion, a moment that is crushed in the central axis direction is generated in the reinforcing rib portion when the compressive force is applied. The buckling strength will decrease.

The reinforcing rib portion may be formed on a parting line.
In this configuration, the preform is subjected to primary stretch blow molding in a primary blow mold and molded into a first molded body, and then the first molded body is heated to shrink to form a second molded body. In the case where the bottle is molded by performing secondary blow molding in the secondary blow mold (second so-called two-stage blow molding method), the annular recess provided in the secondary blow mold. Of the convex molding part for molding the groove, the amount of protrusion toward the inside of the secondary blow mold in the part located on the split surface of the secondary blow mold is compared with the part for molding the reinforcing groove part. It becomes possible to make it smaller.

  Therefore, even if the protruding amount of the portion for forming the reinforcing groove portion of the convex molded portion is increased and the recessed amount of the reinforcing groove portion is increased, the protruding amount of the portion located on the dividing surface is small. It is possible to prevent the convex molding portion located on the dividing surface from biting into the annular concave groove and its peripheral portion at the time of clamping the secondary blow molding. Thereby, high-efficiency production of bottles and stabilization of product quality can be achieved.

  Here, the size in the circumferential direction of the bottle is gradually reduced as the reinforcing rib portion moves outward in the radial direction of the bottle, and the radially outer end portion of the reinforcing rib portion is on the parting line. In the case where it is positioned, the protruding portion located on the dividing surface gradually decreases in the protruding amount toward the dividing surface, so that the occurrence of the biting can be surely prevented.

Furthermore, the amount of dents directed radially inward of the reinforcing rib portion may be 35% or more of the amount of dents directed radially inward of the reinforcing groove portion.
In this case, the rigidity with respect to the said dent etc. can be improved reliably. Moreover, the fall of buckling strength can be prevented by making the dent amount of a reinforcement rib part 75% or less of the dent amount of a reinforcement groove part.
In addition, it is more desirable that the dent amount of the reinforcing rib portion is 45% or more and 70% or less of the dent amount of the reinforcing groove portion.

  Here, if the dent amount of the reinforcing rib portion is smaller than 35% of the dent amount of the reinforcing groove portion, the bottle rigidity with respect to the dent or the like is insufficient, and if it is larger than 75%, the buckling strength is insufficient.

Furthermore, the distance from the central axis of the reinforcing rib portion may be 90% or more of the radius of the maximum diameter portion of the trunk portion. Further, the distance from the central axis at the deepest portion of the reinforcing groove portion may be 90% or less of the radius of the maximum diameter portion of the trunk portion.
In this case, it is possible to reliably avoid the convex molding portion from biting the annular concave groove and its peripheral portion when the secondary blow molding is clamped.
When the bottle is molded by the two-stage blow molding method, it is desirable that the diameter of the second molded body is 90% or more of the maximum diameter of the bottle in order to ensure shapeability.

  According to the bottle according to the present invention, the buckling strength can be maintained at a high level, and the rigidity against a dent or the like can be improved.

  Embodiments of the present invention will be described below with reference to the drawings. The bottle 10 according to this embodiment includes a heel portion 12 having a bottom portion 11, a body portion 13 provided continuously with an upper end portion of the heel portion 12, and a portion provided continuously with an upper end portion of the body portion 13 so as to face upward. And a mouth portion 15 that is connected to the upper end portion of the shoulder portion 14 and extends upward, and has a substantially circular cross section and is formed in the mouth portion 15. A cap (not shown) is screwed onto the male screw portion 15a. Further, the heel portion 12, the body portion 13, the shoulder portion 14, and the mouth portion 15 are integrally formed on the same axis with a synthetic resin such as polyethylene terephthalate.

  A plurality of panel portions 13 a that are recessed inward in the radial direction are formed in the body portion 13 in the circumferential direction via column portions 13 b that extend in the direction of the circular central axis O formed by the transverse section. The panel part 13a of this embodiment is extended over the full length except the upper end part 13c and the lower end part 13d in the said central axis O direction of the trunk | drum 13. As shown in FIG. In the illustrated example, six panel portions 13a and pillar portions 13b are formed in the body portion 11 at regular intervals in the circumferential direction.

  Further, in the present embodiment, the annular concave grooves 16 and 17 in which both the connecting portion between the heel portion 12 and the trunk portion 13 and the connecting portion between the trunk portion 13 and the shoulder portion 14 extend over the entire circumference. It is said that. It should be noted that the upper end portion 13c of the trunk portion 13, the lower end portion 13d of the trunk portion 13, the lower end portion 14a of the shoulder portion 14, and the upper end portion 12a of the heel portion 12 are connected to the annular grooves 16 and 17 in the direction of the central axis O. The outer diameters of all are, for example, about 68 mm and the same.

  And in the bottle 10 of this embodiment, at least one part of the part along the extension direction of the pillar part 13b is made into the reinforcement rib part 18 among each annular ditch | grooves 16 and 17, and this reinforcement rib part 18 is remove | excluded. This portion is a reinforcing groove portion 18b in which the amount of recess toward the radially inner side is larger than that of the reinforcing rib portion 18. Here, in this embodiment, the reinforcement rib part 18 is formed in the part along the extending direction of all the six pillar parts 13b of the annular recessed grooves 16 and 17. FIG. The reinforcing groove portion 18b has a circular arc shape with a central axis O as the center.

  In addition, as shown in FIG. 2, the reinforcing rib portion 18 has a V-shape that is convex outward in the radial direction of the bottle 10 in a plan view of the cross section. Further, the V-shaped top portion 18a, that is, the radially outer end portion is located at a portion corresponding to the circumferential central portion of the column portion 13b. Furthermore, of the six reinforcing rib portions 18, the two top portions 18a located on opposite sides of the central axis O are divided surfaces of a pair of secondary blow molds at the time of secondary blow molding described later. Is located on a parting line (die parting line) L formed by

  And the amount A of dents in the radial inward direction of the reinforcing rib 18 is 35% or more and 75% or less, preferably 45% or more and 70% or less of the amount of dent B in the radial direction inward of the reinforcing groove 18b. Has been. Here, the said dent amount A is the radial direction of the said bottle 10 with the outer peripheral surface of the upper end part 13c of the trunk | drum 13, and the lower end part 13d of the trunk | drum 13, and the outer peripheral surface in the top part 18a of the reinforcement rib part 18. It is taken as a distance. In the present embodiment, the upper end portion 13 c and the lower end portion 13 d are the maximum diameter portion of the body portion 13. The dent amount B is the distance in the radial direction of the bottle 10 between the outer peripheral surface of the maximum diameter portion and the deepest portion of the outer peripheral surface of the reinforcing groove portion 18b. For example, the recess amount A is about 2 mm, and the recess amount B is about 4 mm.

  Further, the distance C from the central axis O of the outer peripheral surface of the top portion 18a of the reinforcing rib portion 18 is 90% or more of the radius D of the outer peripheral surface of the maximum diameter portion, and further the deepest in the outer peripheral surface of the reinforcing groove portion 18b. The distance E from the central axis O of the portion is 90% or less of the radius D. For example, the distance C is about 32 mm, the radius D is 34 mm, and the distance E is about 30 mm.

  Here, as shown in FIG. 3, the distance from the central axis O of the edge part of the panel part 13a and the deepest part of the reinforcement groove part 18b is made equal. In the present embodiment, the deepest portion of the reinforcing groove 18b is the central portion in the central axis O direction.

  Moreover, as shown in FIG. 3, the distance from the said central axis O of the top part 18a of the pillar part 13b and the reinforcement rib part 18 is made equivalent.

Next, the manufacturing method of the bottle 10 comprised as mentioned above is demonstrated.
First, a preform is subjected to primary stretch blow molding in a primary blow mold and molded into a first molded body, and then the first molded body is heated to shrink to form a second molded body. The bottle 10 is shape | molded by carrying out secondary blow molding of a molded object in a secondary blow mold.

  Here, of the convex molding part for molding the annular concave grooves 16 and 17 provided in the secondary blow mold, the part for molding the reinforcing rib part 18 is more than the part for molding the reinforcing groove part 18b. The amount of protrusion toward the inside of the secondary blow mold is reduced. Further, in the portion located on the split surface of the secondary blow mold, there is a convex molding portion for molding two of the six reinforcing rib portions 18 located on opposite sides of the central axis O. Is provided.

  In other words, the protruding amount of the portion of the convex molding portion located on the dividing surface is made smaller than the portion of the reinforcing groove portion 18b. In particular, the reinforcing rib portion 18 of the present embodiment is V-shaped, and the top portion 18a of the reinforcing rib portion 18 is located on the parting line L, so that the convex molding located on the dividing surface. As the part moves toward the dividing surface, the protrusion amount is gradually reduced.

  As described above, according to the bottle 10 according to the present embodiment, the reinforcing grooves 18b are provided in the annular concave grooves 16 and 17, so that the rigidity of the bottle 10 with respect to the dents and the like is improved, and the reinforcing rib 18 Therefore, it is possible to prevent the buckling strength from being lowered, and it is possible to provide the bottle 10 with improved rigidity against dents while maintaining the buckling strength at a high level. .

  Further, since the reinforcing rib portion 18 has a V shape in which the plan view of the transverse section is convex outward in the radial direction of the bottle, the reinforcing rib portion having a small dent amount in the annular grooves 16 and 17 is provided. The proportion of the occupied volume of 18 can be suppressed, and by providing the reinforcing rib portion 18, it is possible to suppress the improvement in rigidity with respect to the recess or the like.

  Further, the distance from the central axis O of the end portion of the panel portion 13a and the deepest portion of the reinforcing groove portion 18b is made equal, and the column portion 13b and the top portion 18a of the reinforcing rib portion 18 from the central axis O. Since the distance is equal, the buckling strength of the bottle 10 can be improved.

  Further, since the reinforcing rib portion 18 is formed on the parting line L, the secondary blow in the portion located on the dividing surface of the secondary blow mold among the convex molding portions of the secondary blow mold. The amount of protrusion toward the inside of the mold can be made smaller than that of the portion where the reinforcing groove 18b is formed.

  Therefore, even if the protruding amount of the portion where the reinforcing groove portion 18b is formed in the convex molded portion is increased and the recessed amount of the reinforcing groove portion 18b is increased, the protruding amount of the portion located on the dividing surface is small. It is possible to prevent the convex molding portion located on the dividing surface from biting into the annular concave grooves 16 and 17 and the peripheral portion thereof when the secondary blow molding is clamped. Thereby, high-efficiency production of bottles and stabilization of product quality can be achieved.

  In particular, in the reinforcing rib portion 18 of the present embodiment, the V-shape is formed, and the top portion 18a is positioned on the parting line L. Therefore, the protruding amount of the convex molding portion positioned on the dividing surface is set. , It becomes possible to gradually reduce the size toward the dividing surface, and the occurrence of the biting can be surely prevented.

  Furthermore, since the amount of dent A toward the radially inward of the reinforcing rib portion 18 is 35% to 75% of the amount of dent B toward the radially inward of the reinforcing groove portion 18b, the buckling strength is increased. It is possible to prevent the decrease and to improve the rigidity with respect to the dent or the like.

  Furthermore, since the distance C from the central axis O of the reinforcing rib portion 18 is 90% or more of the radius D on the outer peripheral surface of the maximum diameter portion, the convexity can be increased when the secondary blow molding is clamped. It is possible to reliably avoid the molded portion from biting the annular concave grooves 16 and 17 and the peripheral portion thereof.

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 embodiment, the reinforcing rib portion 18 is formed at a position corresponding to all the column portions 13b. However, if the reinforcing rib portion 18 is formed at a position corresponding to at least one column portion 13b, the embodiment is not limited to the embodiment. Absent.

Further, although the reinforcing rib portion 18 is formed on the parting line L, the present invention can also be applied to the case where it is not formed on the line L.
Further, the reinforcing rib portion 18 has a configuration in which the cross-sectional view in the plan view is V-shaped. Alternatively, the cross-sectional view in the plan view may be a trapezoidal shape or a parallelogram shape. .
Furthermore, in the said embodiment, although the bottle 10 was shape | molded by what is called a two-stage blow molding method, you may shape | mold by the single blow which shape | molds in the final bottle shape by one blow molding.
Further, the annular grooves 16 and 17 may be provided in at least one of a connection portion between the shoulder portion 18 and the body portion 13 and a connection portion between the body portion 13 and the heel portion 12. Further, the reinforcing rib portion 18 and the reinforcing groove portion 18 b may be provided in at least one of the annular concave grooves 16 and 17 provided in the bottle 10.

  Here, among the effects described above, the dent amount A of the reinforcing rib portion 18 is set to 35% or more and 75% or less of the dent amount B of the reinforcing groove portion 18b, thereby maintaining the buckling strength at a high level. In addition, a verification test was carried out to confirm that the rigidity of the dents and the like can be improved.

  As an example, the outer diameter of the upper end portion 13c and the lower end portion 13d as the maximum diameter portion of the body portion 13 is set to 68 mm, the dent amount B of the reinforcing groove portion 18b is set to 4 mm, and the dent amount A of the reinforcing rib portion 18 is set. Four types of bottles 10 having different dent amounts A of the reinforcing rib portions 18 were formed so as to be 35%, 50%, 70%, and 75% of the dent amount B of the reinforcing groove portion 18b.

  As a comparative example, the outer diameter of the upper end portion 13c and the lower end portion 13d of the bottle 10 of the embodiment and the recess amount B of the reinforcing groove portion are made the same, and the recess amount A of the reinforcing rib portion 18 is the recess amount of the reinforcing groove portion 18b. Two types of bottles having different dent amounts A of the reinforcing rib portions 18 were formed so as to be 80% and 25% of B.

Then, each bottle is placed in an upright posture in an empty state, a compressive force in the direction of the central axis O is applied to the bottle from the mouth portion 15 toward the bottom portion 11, and the load when the bottle is buckled, that is, the seat The bending strength was measured.
Also, when each bottle is laid down in an empty state and the annular grooves 16 and 17 are pressed toward the inside in the radial direction of the bottle by the outer peripheral surface of a 20 mm diameter rod, and a dent or the like is generated in the bottle The load, that is, the rigidity strength was measured.
The above measurement was carried out with 10 bottles of each type.

  Here, it is generally known that if the buckling strength is about 294N and the rigidity strength is about 34.3N, the bottle will not buckle or dent during actual use such as filling and distribution. The magnitude of each strength was evaluated as a reference value.

  As a result, if the dent amount A of the reinforcing rib portion 18 is 35% or more and 75% or less of the dent amount B of the reinforcing groove portion 18b, the buckling strength is maintained at a higher level than the reference value, and the rigidity strength is improved. It was confirmed that Further, it was confirmed that the biting can be prevented when forming such a bottle.

  The buckling strength can be maintained at a high level, and the rigidity against dents can be improved.

It is a schematic block diagram of the bottle shown as one Embodiment which concerns on this invention. It is the XX arrow directional cross-sectional view and YY arrow directional cross-sectional view of the bottle shown in FIG. It is a partially expanded longitudinal cross-sectional view of the bottle shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bottle 11 Bottom part 12 Heel part 13 Trunk part 13a Panel part 13b Column part 13c Upper end part of trunk | drum (largest diameter part of trunk | drum)
13d Lower end of trunk (maximum diameter of trunk)
14 shoulder portion 15 mouth portion 16, 17 annular groove 18 reinforcing rib portion 18a top portion (radially outward end)
18b Reinforcement groove part A Reinforcement rib part dent B Reinforcement groove dent L Parting line O Center axis

Claims (7)

A heel portion having a bottom portion, a trunk portion connected to the upper end portion of the heel portion, a shoulder portion connected to the upper end portion of the trunk portion and gradually reduced in diameter toward the upper side; And a mouth portion extending upward and connected to the upper end portion, and having a substantially circular cross section, a circularly indented panel portion is formed in the center of the circular shape of the body portion. A plurality of circumferentially formed column portions extending in the axial direction, and at least one of a connection portion between the heel portion and the body portion and a connection portion between the body portion and the shoulder portion is formed on the entire circumference. It is a bottle made into an annular groove extending over the crawling,
Of the annular groove, at least a part of the portion along the extending direction of the column portion is a reinforcing rib portion, and a portion excluding the reinforcing rib portion is radially inward from the reinforcing rib portion. A bottle characterized in that it is a reinforcing groove with a large amount of dent directed. The bottle of claim 1,
The bottle characterized in that the reinforcing rib portion has a V-shape in which a plan view of the cross section is convex outward in the radial direction of the bottle. In the bottle according to claim 1 or 2,
The bottle characterized by the distance from the said central axis line being equal in the edge part of the said panel part, and the deepest part of the said reinforcement groove part. In the bottle according to any one of claims 1 to 3,
The distance between the said pillar part and the said reinforcing rib part from the said center axis line is made equal. In the bottle according to any one of claims 1 to 4,
The bottle characterized in that the reinforcing rib portion is formed on a parting line. In the bottle according to any one of claims 1 to 5,
The bottle characterized in that the amount of recesses directed radially inward of the reinforcing rib portion is 35% or more of the amount of recesses radially inward of the reinforcing groove portion. The bottle according to claim 6,
The bottle characterized by the distance from the said central axis line of the said reinforcement rib part being 90% or more of the radius of the largest diameter part of the said trunk | drum.

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