JP5902385B2 - Bottle manufacturing method - 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 by blow molding, for example, as shown in Patent Document 1 below, a heel having an upper end opening connected to a lower end opening of a trunk portion And a bottom wall portion that closes the lower end opening of the heel portion and whose outer peripheral edge portion is a grounding portion, and the bottom wall portion is connected to the grounding portion from the inner side in the bottle radial direction and extends upward. A rising peripheral wall portion extending toward the upper side, an annular movable wall portion protruding inward in the bottle radial direction from the upper end portion of the rising peripheral wall portion, and upward from an inner end portion of the movable wall portion in the bottle radial direction. And the movable wall portion absorbs the reduced pressure in the bottle by rotating around the connecting portion with the rising peripheral wall portion so as to move the depressed peripheral wall portion upward. The configuration is known.

This bottle is generally blow-molded using a mold comprising a plurality of mold members with cavities formed therebetween. The mold includes, as mold members, a body mold provided with a cavity space that opens downward, and a bottom mold that closes the space from below.
In a bottle manufactured using such a mold, a parting line between the body mold and the bottom mold is formed over the entire circumference in the grounding portion at the bottom.

JP 2010-126184 A

  However, in the conventional bottle, since the parting line is formed in the grounding portion, there is a possibility that the grounding may become unstable when a burr occurs in the parting line.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a bottle that can easily ensure grounding stability.

In order to solve the above problems, the present invention proposes the following means.
The bottle manufacturing method according to the present invention is formed of a synthetic resin material in the shape of a bottomed cylinder , and the bottom portion includes a heel portion whose upper end opening is connected to the lower end opening of the body portion, and a lower end opening of the heel portion. A bottom wall portion whose outer peripheral edge portion is a grounding portion, and the bottom wall portion is connected to the grounding portion from the inside in the bottle radial direction and extends upward and extends upward, An annular movable wall portion extending from the upper end portion of the rising peripheral wall portion toward the inside in the bottle radial direction, and a depressed peripheral wall portion extending upward from the inner end portion of the movable wall portion in the bottle radial direction, The movable wall portion is formed as a plurality of mold members that form cavities, with the bottles arranged rotatably around the connecting portion with the rising peripheral wall portion so as to move the depressed peripheral wall portion upward. A body mold provided with a space for the cavity, and the hollow A bottle manufacturing method of forming by blow molding using a mold comprising a bottom mold, a for closing, the rising peripheral wall portion, the parting line of the joint between the bottom mold and the drum mold It is characterized by being formed in a circumferential shape.

According to the present invention, since the parting line is formed on the rising peripheral wall portion , even if a burr occurs in the parting line, this burr hardly affects the grounding of the bottle and ensures the grounding stability of the bottle. Can be made easier.

In addition, since the parting line is formed on the rising peripheral wall portion, the parting line becomes difficult to be visually recognized from the outside in a state where the bottle is grounded, and the appearance of the bottle can be improved.

  According to the bottle of the present invention, it is possible to easily ensure the ground contact stability.

It is a side view of the bottle in the embodiment of the present invention. It is a bottle bottom view in the embodiment of the present invention. It is the AA line of FIG. It is a bottle bottom view in the modification of this invention. It is a BB line of FIG.

Hereinafter, bottles according to embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the bottle 1 according to this embodiment includes a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14, and these 11 to 14 have their central axes as a common axis. It is a schematic configuration that is arranged in this order in a state of being positioned above.

Hereinafter, the common axis is referred to as the bottle axis O, the mouth side is referred to as the upper side, the bottom 14 side is referred to as the lower side along the bottle axis O direction, and the direction perpendicular to the bottle axis O is referred to as the bottle radial direction. The direction of circling around the bottle axis O is referred to as the 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. Further, the mouth portion 11 is formed with a male screw portion 11a, and a cap (not shown) is screwed thereon. Further, each of the mouth part 11, the shoulder part 12, the body part 13, and the bottom part 14 has a circular shape in a cross-sectional view orthogonal to the bottle axis O.

A first annular groove 16 is continuously formed over the entire circumference at the connecting portion between the shoulder portion 12 and the body portion 13.
The trunk | drum 13 is formed in a cylindrical shape, and between both ends of the bottle axis | shaft O direction is formed in a smaller diameter than these both ends. A plurality of second annular grooves 15 are continuously formed in the body portion 13 over the entire circumference at intervals in the bottle axis O direction.

A third annular groove 20 is continuously formed over the entire circumference at the connection portion between the body portion 13 and the bottom portion 14.
The bottom part 14 includes a heel part 17 whose upper end opening is connected to the lower end opening part of the body part 13, and a bottom wall part 19 which closes the lower end opening part of the heel part 17 and whose outer peripheral edge part is a grounding part 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 the upper heel portion 28 connected to the heel lower end portion 27 from above. The connecting portion 29 with the heel portion 28 is gradually reduced in diameter from the upper side to the lower side. The upper heel portion 28 is the maximum outer diameter portion of the bottle 1 together with both end portions of the body portion 13 in the bottle axis O direction. The upper heel portion 28 has the same depth as the third annular groove 20. A fourth annular groove 31 is formed continuously over the entire circumference.

  As shown in FIG. 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 to the inside in the bottle radial direction. An annular movable wall portion 22 projecting toward the top, a depressed peripheral wall portion 23 extending upward from an inner end portion of the movable wall portion 22 in the bottle radial direction, and a closed wall portion closing the upper end opening of the depressed peripheral wall portion 23 24.

The rising peripheral wall portion 21 is gradually reduced in diameter from the lower side toward the upper side.
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 about a curved surface portion (connection portion with the rising peripheral wall portion 21) 25 so that the depressed peripheral wall portion 23 is moved upward.

The depressed peripheral wall portion 23 is disposed coaxially with the bottle axis O, and gradually increases in diameter from the upper side toward the lower side and is formed in multiple stages. The depressed peripheral wall portion 23 gradually increases from the inner end portion in the bottle radial direction of the movable wall portion 22 toward the upper side, and gradually decreases toward the lower side from the outer peripheral edge portion of the closed wall portion 24 and the closed peripheral wall portion 24. And an upper cylinder part 23b formed in a curved shape protruding downward and projecting downward, and a step part 23c for connecting both the cylinder parts 23a and 23b. Is formed.
The lower cylinder part 23a is connected to the inner end part of the movable wall part 22 in the bottle radial direction via a curved surface part 26 protruding downward. Moreover, the lower cylinder part 23a is formed in the cross-sectional view circular shape.

  The upper tube portion 23b is formed with an overhang portion 23d that protrudes toward the inside in the bottle radial direction. The overhang portion 23d is formed over substantially the entire length in the bottle axis O direction excluding the upper end portion of the upper tube portion 23b, and a plurality of overhang portions 23d are formed in the bottle circumferential direction as shown in FIG. In the illustrated example, the overhang portions 23d adjacent to each other in the bottle circumferential direction are arranged with an interval in the bottle circumferential direction.

  And the cross-sectional view shape of the upper cylinder part 23b is deform | transforming from polygonal shape (in the example of illustration into a substantially equilateral triangle shape) to circular shape as it goes upwards from the downward direction by forming the overhang | projection part 23d. And the cross-sectional view shape in the upper end part of the upper cylinder part 23b is circular. In the portion of the upper tube portion 23b where the cross-sectional view shape is a polygonal shape, the overhanging portion 23d is a polygonal side portion and is located between the overhanging portions 23d adjacent in the bottle circumferential direction. The portion 23e is a polygonal corner.

As shown in FIG. 3, the closing wall portion 24 is disposed coaxially with the bottle shaft O and is formed in a disk shape, and the depressed peripheral wall portion 23 and the closing wall portion 24 are formed in a cylindrical shape as a whole. ing.
In the present embodiment, the parting line PL extending over the entire circumference is formed on the rising peripheral wall portion 21 . The parting line PL mentioned here refers to what is formed in a circumferential shape as a joint between a body mold and a bottom mold, which will be described later.

Next, the manufacturing method of the bottle 1 is demonstrated.
The bottle 1 is formed by blow-molding the preform using a mold (not shown) including a plurality of mold members with cavities formed therebetween. As a mold member of the mold, a cylinder mold (not shown) provided with a space for a cavity that opens downward (for example, a pair of left and right split molds), a bottom mold (not shown) that closes the space from below, It has.

Among the molds, the convex molding part that molds the bottom wall part 19 of the bottle 1 as shown in FIG. 3 that is located inside the grounding part 18 includes a lower end part of the body mold, the bottom mold, and the like. It is comprised by. And the division | segmentation surface of these trunk | drum type | molds and bottom mold | types is located in the part which shape | molds the rising surrounding wall part 21 among the said convex shaping | molding parts.

As an example of manufacturing the bottle 1 using this mold, first, the preform is stretched in the space in a state where the bottom mold is kept waiting at the lower end opening of the space in the body mold. Then, of the bottom portion of the stretched preform or the preform being stretched, a portion located inside the bottle radial direction from the grounding portion 18 is pushed upward by the upward movement of the bottom mold. Thereby, the bottle 1 in which the parting line PL is formed on the rising peripheral wall portion 21 is formed.
This manufacturing method is merely an example, and the bottom mold may be partially or stepwise raised, and the pushing may be performed by raising a part of the bottom mold.

As described above, according to the bottle 1 according to the present embodiment, since the parting line PL is formed on the rising peripheral wall portion 21, even if a burr occurs on the parting line PL, It is difficult to affect the grounding of the bottle 1, and the grounding stability of the bottle 1 can be easily secured.
In addition, since the parting line PL is formed on the rising peripheral wall portion 21 in this way, the parting line PL becomes difficult to be visually recognized from the outside in a state where the bottle 1 is grounded, and the appearance of the bottle 1 is improved. Can be improved.

  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, like the bottle 40 shown in FIGS. 4 and 5, a plurality of ribs 41 may be radially arranged around the bottle axis O on the movable wall portion 22. The rib 41 is formed by intermittently arranging a plurality of concave portions 41a recessed in a curved shape upward.
Further, as in the case of the bottle 40, an uneven portion 42 may be formed on the rising peripheral wall portion 21 over the entire circumference. In addition, the uneven | corrugated | grooved part 42 is arrange | positioned at intervals in the bottle peripheral direction by the some protrusion 42a formed in the curved surface shape which protruded toward the inner side of the bottle radial direction. The protrusion 42a is disposed in a portion of the rising peripheral wall portion 21 that is located above the lower end portion 21a.

The rising peripheral wall portion 21 may be appropriately changed, for example, extending in parallel along the bottle axis O direction.
Further, the movable wall portion 22 may be appropriately changed, for example, by projecting in parallel along the bottle radial direction, or by inclining upward.

  Moreover, in the said embodiment, although the overhang | projection parts 23d adjacent to the bottle circumferential direction shall be arrange | positioned at intervals in the bottle circumferential direction, it is not restricted to this, For example, the said overhang | projection part 23d may be arrange | positioned without a space | interval in the bottle circumferential direction, and may mutually be connected directly. In this case, the cross-sectional view shape in the part in which the overhang | projection part 23d is arrange | positioned among the upper cylinder parts 23b may be circular, and the cross-sectional view shape of the upper cylinder part 23b is a bottle axis | shaft O direction. It may be circular over the entire length.

Further, the depressed peripheral wall portion 23 can be appropriately changed, such as extending in parallel along the bottle axis O direction as long as it extends upward from the inner end portion of the movable wall portion 22 in the bottle radial direction. It is. That may or may not the protruding portion 23 d is gradually as it goes from the top to the bottom, may not be expanded in diameter, may not be formed in multiple stages.

  Moreover, in the said embodiment, although the parting line PL was formed in the standing | starting-up surrounding wall part 21, it may replace with this and may be formed in the said heel part 17. FIG.

Further, the synthetic resin material forming the bottle 1 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material or a laminated structure thereof.
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 circular shape, it changes suitably, for example not only to this but polygonal shape May be.

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

DESCRIPTION OF SYMBOLS 1, 40 Bottle 14 Bottom part 17 Heel part 18 Grounding part 19 Bottom wall part 21 Standing peripheral wall part 22 Movable wall part 23 Depressed peripheral wall part 25 Curved surface part (connection part with rising peripheral wall part)
PL parting line

Claims (1)

It is formed into a bottomed cylinder with a synthetic resin material ,
The bottom
A heel portion whose upper end opening is connected to the lower end opening of the trunk, and
A bottom wall portion that closes a lower end opening of the heel portion and has an outer peripheral edge portion as a ground contact portion,
The bottom wall is
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 extending from the upper end of the rising peripheral wall toward the inside 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 a bottle disposed rotatably around a connecting portion with the rising peripheral wall portion so as to move the depressed peripheral wall portion upward .
A method of manufacturing a bottle formed by blow molding using a mold including a body mold provided with a cavity space as a plurality of mold members forming a cavity and a bottom mold for closing the space. ,
Wherein the rising wall portion, the bottle manufacturing method, which comprises forming a parting line as the joint between the bottom mold and the trunk mold circumferentially.

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