JP7086012B2 - Synthetic resin blow container - Google Patents

Description

The present invention relates to a synthetic resin blow container, and particularly relates to a synthetic resin blow container that prevents buckling deformation of a neck ring provided in a mouthpiece.

As a synthetic resin container for filling the contents, for example, a container as described in Patent Document 1 below is generally known.
The container described in Patent Document 1 is a heat-filled bottle formed by a direct blow method in which a molten resin blows a cylindrical extruded parison sandwiched between two split dies from both sides. As shown in a semi-cross-sectional view such as FIG. 1 of the same document, in a container formed by the direct blow method, the neck ring provided in the mouth tube portion may be formed into a hollow shape.

Japanese Unexamined Patent Publication No. 2013-11241

When plugging a cap into a container, it is necessary to increase the plugging force especially when a high fitting force is to be obtained.
However, since the hollow neck ring has a weak mechanical strength, the neck ring may buckle and deform when a large plugging force acts on the mouth tube, resulting in incomplete cap attachment. There is.

In the present invention, in order to solve the above-mentioned problems in the prior art, the buckling of the neck ring effectively absorbs and relaxes the plugging force (vertical load or impact) applied to the mouthpiece when the cap is plugged. The challenge is to create a synthetic resin blow container that can prevent deformation.

Among the means for solving the above problems, the main configuration of the present invention is
A synthetic resin blow container equipped with a neck ring formed in a circumferential and hollow shape in the mouth tube to which a vertical load or impact is applied.
The neck ring is provided with intermittent portions formed at a plurality of points in the circumferential direction and a plurality of convex ribs formed by dividing the neck ring by the intermittent portions.
The convex ribs are formed from the lower end of the mouth cylinder portion to the lower end of the mouth cylinder portion and toward the upper end portion of the neck portion provided at the lower end position of the mouth cylinder portion. It is formed in an inclined cross-sectional shape with an inclined support portion, a folded portion located between the inclined portion and the supporting portion, and end walls formed at both ends in the circumferential direction of the convex rib, and at least the circumference. It is characterized in that the end walls formed at both ends in the direction are formed on a vertical surface, and a hollow portion is provided between the inclined portion and the support portion .

In the above configuration, by dividing the neck ring into convex ribs having a short length dimension, it is possible to make it difficult for the individual convex ribs after the division to be crushed.

Further, the convex ribs are directed from the lower end of the inclined portion to the upper end of the neck portion provided at the lower position of the mouth cylinder portion and the inclined portion formed in a diameter-increasing shape from the lower end of the mouth cylinder portion downward. Convex because it was formed in an inclined cross-sectional shape with a support portion formed in the above direction, a folded portion located between the inclined portion and the support portion, and end walls formed at both ends in the circumferential direction of the convex rib. The buckling strength of the rib can be improved.

Further, another configuration of the present invention is a configuration in which the folded portion is formed on a vertical surface in addition to the configuration according to claim 1.

In the above configuration, since the folded portion and both end walls function as pillar portions, the convex ribs that can sufficiently withstand vertical loads and impacts can be obtained.

Further, another configuration of the present invention is the configuration according to claim 1 or 2, wherein the length dimension in the circumferential direction of the inner peripheral end of the inclined portion forming the convex rib and the length dimension in the circumferential direction of the outer peripheral end of the support portion. And are formed to the same dimensions, and the configuration of and is added.

With the above configuration, it is possible to suppress variations in the strength of the convex ribs in the circumferential direction.

Further, another configuration of the present invention is a configuration in which the intermittent portion is arranged at a position symmetrical with respect to the parting line in addition to any of the above configurations.

In the above configuration, the die-cutting work of the bottle after molding is facilitated without complicating the molding die and the molding process, further, three or more split dies are required, and the molding process is complicated. You don't have to.

Since the present invention has the above-mentioned configuration, the following effects are obtained.

By dividing the neck ring into convex ribs having a short length, it is possible to prevent the individual convex ribs after the division from being crushed. Further, the buckling strength can be improved by forming the convex ribs in an inclined cross section. Further, by forming the folded portion and both end portions on substantially vertical surfaces, the folded portion and both end walls function as pillar portions, so that the buckling strength can be further improved. Therefore, it is possible to more reliably plug the cap into the mouth tube portion.

In particular, in the case of a direct blow molded container in which the contents are heat-filled, the buckling deformation of the neck ring at the time of capping can be effectively prevented, so that the capping force is strengthened and the cap is fitted. It is possible to improve the resultant force, and as a result, high airtightness can be maintained.

It is a perspective view which shows the blow container made of synthetic resin as the embodiment of this invention. It is a front view of the blow container made of synthetic resin. It is a top view of the blow container made of synthetic resin. It is a bottom view of a blow container made of synthetic resin. It is a semi-cross-sectional view which shows the vicinity of the mouth tube part of a synthetic resin blow container enlarged.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The bottle 1 is a so-called synthetic resin blow container obtained by stretching a parison made of, for example, polypropylene (PP) resin by a direct blow method. The bottle 1 is provided with a mouth tube portion 2 and a neck portion 3 at the upper portion thereof, and has a shoulder portion 4 that expands in diameter from the lower end of the neck portion 3 and a cylindrical body portion 5 and a bottom portion 6 that extend downward from the shoulder portion 4. Has and is configured.

Both the mouth tube portion 2 and the neck portion 3 have a short cylindrical shape, and the lower neck portion 3 is formed with a larger diameter than the upper mouth tube portion 2. As shown in FIG. 5, a hook ring 7 for fixing and holding a cap (not shown) is provided around the mouth tube portion 2, and a neck ring 8 is integrally formed between the mouth tube portion 2 and the neck portion 3. Has been done.

Intermittent portions 9 formed by lacking a part of the neck ring 8 are arranged at a plurality of locations (four in this embodiment), and a plurality of neck rings 8 are formed by the plurality of intermittent portions 9 (4). In this embodiment, it is divided into four) convex ribs 8A (see FIG. 3). By dividing the circumferential neck ring 8 into convex ribs 8A having a shorter length dimension in the circumferential direction in this way, it is possible to make the individual convex ribs 8A less likely to be crushed.

More specifically, as shown in FIG. 5, the convex rib 8A has an inclined portion 8a formed in an enlarged diameter from the lower end of the mouth cylinder portion 2 and from the lower position of the lower end of the inclined portion 8a to the upper end of the neck portion 3. An inclined portion 8c formed toward the support portion 8c, a folded portion 8b located between the inclined portion 8a and the supporting portion 8c, and end walls 8d formed at both ends in the circumferential direction of the convex rib 8A. It is formed in a cross-sectional shape. Such a convex rib 8A has a configuration in which a hollow portion 8e is provided between the inclined portion 8a and the support portion 8c, but the folded portion 8b and the end walls (both end walls) 8d at both ends resist vertical load and impact. The buckling strength can be increased by forming the surface on a substantially vertical surface and allowing it to function as a pillar.

Further, as shown in FIG. 5, the cross section of the intermittent portion 9 has an inclined surface shape, but the shape of the intermittent portion 9 when viewed from the front has the upper end connected to the lower end of the mouth tube portion 2 as the apex and the upper end of the neck portion 3. It is a substantially isosceles triangle with the bottom side connected to the bottom. On the other hand, the convex rib 8A has a length dimension L1 in the circumferential direction of the inner peripheral end on the inclined portion 8a side connected to the lower end of the mouth cylinder portion 2 and an outer peripheral end on the support portion 8c side connected to the upper end of the neck portion 3. It is formed to have the same dimension (L1 = L2) as the length dimension L2 in the circumferential direction. By matching the length dimensions of the upper end and the lower end of the convex rib 8A in the circumferential direction in this way, it is possible to prevent the strength of the convex rib 8A from varying over the entire circumferential direction.

Further, the plurality of intermittent portions 9 are arranged at positions that are line-symmetrical across the parting line PL and at positions other than on the parting line PL, and the parison is directly sandwiched between two split dies from both sides. It is possible to facilitate the die-cutting work after blow molding. Further, the bottle 1 can be easily molded without increasing the number of molding dies for molding to three or more and complicating the molding process.

The step of plugging the cap into the bottle 1 having the above configuration is performed in a state where the neck support 20 as a support base is installed under the support portion 8c of the neck ring 8 of the bottle 1 after filling the contents. .. When the cap is plugged, the hooking protrusion (not shown) formed on the inner surface of the cap and the hooking ring 7 on the mouth tube 2 side are engaged (undercut coupling), and the cap is opened. It is firmly fixed to the tubular portion 2 and can maintain high airtightness.

Here, the plugging force acts on the mouth cylinder portion 2 from the vertical direction via the cap. At this time, the support portion 8c of the convex rib 8A constituting the neck ring 8 oppresses and supports the neck support 20. The tapping force also acts on the end walls 8d and the folded portion 8b at both ends of the convex rib 8A, but the both end walls 8d and the folded portion 8b composed of substantially vertical surfaces function as pillar portions. Since it can counteract the plugging force, it effectively prevents the buckling deformation of the convex rib 8A. Further, the plugging force also acts on the inclined surface-shaped intermittent portion 9, but since it acts on the inclined surface separately in the parallel component and the vertical component, the force substantially acting on the intermittent portion 9 becomes small and the convex rib Prevents buckling deformation of 8A.

As described above, in the present invention, the tapping force (vertical load or impact) applied to the mouthpiece portion 2 by forming the intermittent portions 9 at a plurality of portions of the circumferential neck ring 8 and dividing the peripheral neck ring 8 into the convex ribs 8A. Can be effectively absorbed and relaxed, whereby buckling deformation of the convex rib 8A constituting the neck ring 8 can be prevented. Therefore, in the plugging step, the cap can be securely attached to the mouthpiece portion 2.

Although the configuration of the present invention and its action and effect have been described above with reference to Examples, the embodiments of the present invention are not limited to the above Examples.

Further, in the above embodiment, the configuration in which the diameter dimensions of the mouth cylinder portion 2 and the neck portion 3 are different has been described, but the present invention is not limited to this, and the mouth cylinder portion 2 and the neck portion 3 have the same dimensions. It may be configured as follows.

Further, in the above embodiment, the configuration in which both the folded-back portion 8b and the both end walls 8d of the convex rib 8A are formed by substantially vertical surfaces has been described, but the present invention is not limited to this, and any one of them is described. Can also be configured to have a substantially vertical surface. However, it is preferable that both the folded-back portion 8b and the both end walls 8d have substantially vertical surfaces in that the buckling strength can be further increased.

Further, in the above embodiment, an example in which the four convex ribs 8A are divided into four convex ribs 8A by the four intermittent portions 9 has been described, but the number of the intermittent portions 9 and the convex ribs 8A is not limited to four and is two. Any configuration having the above can be used.

INDUSTRIAL APPLICABILITY The present invention can be used in a wider range of applications in the field of blow containers in which a cap is attached to the mouth cylinder of a bottle by tapping.

1: Bottle (blow container)
2: Mouth tube part 3: Neck part 4: Shoulder part 5: Body part 6: Bottom part 7: Hook ring 8: Neck ring 8A: Convex rib 8a: Inclined part 8b: Folded part 8c: Support part 8d: End wall 8e: Hollow part 9: Intermittent part 20: Neck support (support stand)

Claims (4)

A synthetic resin blow container provided with a neck ring (8) formed in a circumferential and hollow shape in a mouth tube portion (2) to which a vertical load or impact is applied.
The neck ring (8) has an intermittent portion (9) formed at a plurality of points in the circumferential direction and a plurality of convex ribs (8A) formed by dividing the neck ring (8) by the intermittent portion (9). ) And are provided,
The convex rib (8A) has an inclined portion (8a) formed in an enlarged diameter downward from the lower end of the mouth cylinder portion (2) and the mouth from a lower position of the lower end of the inclined portion (8a). It is located between the support portion (8c) formed toward the upper end of the neck portion (3) provided at the lower position of the tubular portion (2) and the inclined portion (8a) and the support portion (8c). It is formed in an inclined cross-sectional shape with a folded portion (8b) and end walls (8d) formed at both ends in the circumferential direction of the convex rib (8A), and is formed at least at both ends in the circumferential direction. A synthetic resin blow characterized in that the end wall (8d) is formed on a vertical surface and a hollow portion (8e) is provided between the inclined portion (8a) and the support portion (8c). container. The synthetic resin blow container according to claim 1, wherein the folded portion (8b) is formed on a vertical surface. The circumferential length dimension (L1) of the inner peripheral end of the inclined portion (8a) forming the convex rib (8A) and the circumferential length dimension (L2) of the outer peripheral end of the support portion (8c) are the same. The synthetic resin blow container according to claim 1 or 2 formed in 1. The synthetic resin blow container according to any one of claims 1 to 3, wherein the intermittent portion (9) is arranged at a position symmetrical with respect to the parting line (PL).

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