JP2011213394A - Square shape bottle made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of permanent deformation due to a collapse or the like, with respect to a heat-resistant bottle, without utilizing conventional decompression absorption panel walls while fully inhibiting the occurrence of deformation due to vacuum change, whereas, even if decompression absorption deformation has occurred including a deformation due to pressure change, the deformation is not turned into a permanent deformation.SOLUTION: The formation of flat concave walls 5 on the respective lateral surface walls 4 formed around the barrel part 3 of a square shape bottle made of synthetic resin results in the concave walls 5 exhibiting drag against depressurization, which fully inhibits deformation following a variation in pressure against the lateral surface walls 4.

Description

  The present invention relates to a square bottle made of synthetic resin that is stretch blow molded as a heat resistant bottle.

  A bottle-shaped container made of polyethylene terephthalate resin, which is made of polyethylene terephthalate resin, is widely used as a container for beverages. However, a square-shaped container is particularly easy to handle as a heat-resistant bottle. Is preferred.

  In order to absorb the generated reduced pressure, the square bottle made of synthetic resin as a heat-resistant bottle is generally provided with a reduced pressure absorption panel wall on the side wall of its trunk as shown in Patent Document 1.

JP 2009-143582 A

  In the above-described prior art, there is a complaint that the design of the appearance of the bottle is substantially specified by providing the decompression absorption panel wall having a substantially constant configuration and shape. In order to widen the selection range, it has been considered that the design width of the bottle is remarkably increased by not providing the conventional vacuum absorption panel wall constituted by the uneven wall structure.

  As one of the means, a means for providing a curved side wall which is greatly curved instead of a conventional general pressure absorbing panel wall can be considered. ) Is concentrated, and this causes a disadvantage that permanent deformation due to bending occurs in the central portion of the side wall.

  Therefore, the present invention was devised to eliminate the above-mentioned disadvantages, and in a heat-resistant bottle, it is a technical problem to construct a side wall without any inconvenience with a greatly curved wall structure in place of a conventional vacuum absorption panel wall. Therefore, the purpose is to widen the design range of the appearance of the bottle.

In order to solve the above technical problem, the main configuration of the present invention is as follows.
It is a square bottle made of synthetic resin, which is a stretch blow-molded product, with a mouth tube portion standing upright via a shoulder portion at the upper end of a rectangular tube-shaped body portion whose lower end is closed at the bottom,
Configuring each side wall of the torso into a curved wall structure that sinks with a large curvature,
Forming a concave wall with a flat wall structure in the center of the side wall;
It is in.

  Each side wall has a substantially smooth curved wall structure that sinks with a large curvature without complex irregularities, so the appearance of the bottle is simple and overall it is slightly recessed with respect to the applied decompression Deforms and exerts a strong drag against the acting stress while suppressing this reduced pressure fluctuation.

  In addition, since the concave wall is formed in the central portion of the side wall, the reduced pressure that acts acts almost concentrated on this concave wall portion, but the concave wall has a flat wall structure, The stress due to the action of the reduced pressure does not concentrate in the center, but acts in a state of being distributed over the entire area of the concave wall.

  Since the concave wall formed on the panel wall is merely a change of the central portion of the panel wall, which has been a curved wall structure, to a flat wall structure, the structure is extremely simple and easy to implement.

  Another configuration of the present invention is such that, in addition to the main configuration described above, the concave wall has a shape whose width becomes narrower as it approaches the upper end or lower end of the side wall.

  If the concave wall has a shape that narrows the width as it approaches the upper end or lower end of the side wall, the stress acting on the central part of the side wall can definitely be applied to the concave wall region. In addition, since the concave wall does not vertically cut the side wall, the entire side wall including the concave wall does not cause the vacuum absorption deformation operation similar to the vacuum absorption panel wall, thereby suppressing the depression deformation. Can be stably obtained.

  Another configuration of the present invention is such that, in addition to the main configuration described above, a central circumferential groove is formed in the body portion, and a concave wall is formed in a configuration connected to the central circumferential groove.

  In the case where the central circumferential groove is formed in the body portion and the concave wall is formed with the configuration connected to the central circumferential groove, the central circumferential groove acts directly on the concave wall as a reinforcing rib. The degree of bending deformation of the concave wall corresponding to the pressure fluctuation is greatly suppressed.

  Further, in addition to the main configuration described above, another configuration of the present invention partitions the body portion vertically by forming a central circumferential groove and absorbs one side wall of the body portion partitioned above and below under reduced pressure. A panel wall is formed and a concave wall is formed on the other side wall.

  In the case where one of the side walls divided up and down by the central circumferential groove is used as a vacuum absorption panel wall, the pressure reduction fluctuation is such that it cannot be absorbed by the combination of the side wall and concave wall due to the action of the vacuum absorption panel wall Can be absorbed by elastic deformation, so that the range of pressure reduction applicable to the structure of the present invention can be expanded.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, stress accompanying decompression deformation is concentrated on the concave wall that exerts strong resistance against stress acting while suppressing depression deformation against decompression acting on the side wall. Since they act in a distributed manner, there is no occurrence of bending or permanent deformation due to stress concentration, no deterioration of the appearance of the bottle, and prevention of permanent deformation due to buckling or the like.

  The concave wall formed on the panel wall has a very simple structure and is easy to implement. Therefore, even when using an existing mold as a matter of course for a newly created mold, It can be implemented easily without incurring costs.

  If the concave wall has a shape that becomes narrower as it approaches the upper end or lower end of the side wall, it is possible to stably obtain the reduced pressure absorption deformation in a state in which the side wall is suppressed from being depressed, A well-balanced decompression absorption deformation appearance in a state where the degree of deformation is suppressed can be obtained.

  In the case where the central circumferential groove is formed in the body portion and the concave wall is formed by connecting to the central circumferential groove, the degree of bending deformation of the concave wall corresponding to the applied pressure fluctuation is greatly suppressed. As a result, the stable appearance of the bottle can be maintained.

  In the case where one of the side walls partitioned vertically by the central circumferential groove is a vacuum absorbing panel wall, the range of applicable vacuum pressure of the structure of the present invention can be widened, whereby the bottle according to the present invention can be expanded. The range that can be used effectively can be expanded.

It is a whole front view which shows the example of 1st embodiment of the bottle of this invention. (A) is the plane sectional view which looked at the cutting arrow along the AA line in FIG. 1, (b) is the principal part enlarged view of (a). It is the plane sectional view which looked at the cutting arrow along the BB line in FIG. It is a whole front view which shows the example of 2nd embodiment of the bottle of this invention.

  Hereinafter, an embodiment of a synthetic resin bottle of the present invention will be described with reference to the drawings illustrating an embodiment.

  FIG. 1 shows a first embodiment of the synthetic resin bottle of the present invention. The bottle is a biaxially stretched blow molded product made of polyethylene terephthalate resin, and each corner is rounded with a square wall 7. The lower end of the rectangular tubular body 3 is closed by the bottom 10 and the mouth tube portion 1 having a threaded groove on the outer peripheral surface is erected through a shoulder 2 having a truncated pyramid shape whose diameter is reduced upward at the upper end. A central circumferential groove 9 is provided around the body 3 at a central height position.

  Each side wall 4 which is a main constituent part of the body part 3 is configured to have a substantially smooth wall structure (see FIG. 3) curved in a recessed direction with a large curvature radius, and is divided vertically by a central circumferential groove 9. Yes.

  In this way, each side wall 4 which is a main component of the body portion 3 has a wall structure in which the entire body is curved with a large radius of curvature. Absorbs the reduced pressure acting in the direction of the depression.

  A concave wall 5 (see FIG. 1) is formed in the center portion of each side wall 4 with a configuration in which one upper and lower ends are connected to the central circumferential groove 9, and each concave wall 5 has a flat wall structure. It is partitioned from the side wall 4 by being surrounded by a boundary portion 6 (see FIG. 2B) of a wall structure having a small curvature. That is, the concave wall 5 of the flat wall structure is positioned at the center of the side wall 4 of the curved wall structure and is defined by the boundary portion 6, and the boundary portion 6 that partitions the side wall 4 and the concave wall 5 is bent. Since the wall portion is formed, the bent wall portion functions as a mechanical reinforcing rib.

  Further, since each concave wall 5 is connected to the central circumferential groove 9 having a large acting force as a mechanical reinforcing rib, it receives a strong reinforcing force from the central circumferential groove 9, and therefore the concave wall 5 itself. Has a flat wall structure, the boundary portion 6 exerts a reinforcing rib function, and receives a strong reinforcing force from the central circumferential groove 9, so that it has a function that is difficult to be deformed against a reduced pressure change. As a result, each side wall 4 is greatly suppressed from being deformed according to the reduced pressure.

  Specifically, when the bottle is depressurized, the stress is concentrated on the central portion of the side wall 4 (the deepest portion of the curved wall portion). Since the stress is prevented and the stress is applied to the entire concave wall 5 in a distributed manner, the reduced pressure applied by the concave wall 5 is elastically supported. In addition, when the inside of a bottle will be in a pressurization state, the side wall 4 will deform | transform in an inverted shape and will absorb this acted pressurization.

  In the case of the illustrated embodiment, the curved line drawn by the boundary portion 6 that divides the concave wall 5 from the side wall 4 is formed in an isosceles triangle shape in which both oblique sides are curved to form a spire. Is not specified, and it is possible to draw a line pattern with a configuration that does not cut the side wall 4 vertically, thereby adding novelty and fun to the appearance of the bottle.

  However, as is apparent from FIG. 2B, the curved line drawn by the boundary portion 6 is not noticeable in appearance because the curved portion is curved. Therefore, the boundary portion 6 has a flashy decorative effect. Can not be expected, but it is possible to calm down and reveal a novel decoration effect.

  FIG. 4 shows a second embodiment of the present invention, and shows a case where the decompression range applicable to the present invention is applied to a bottle having a general decompression absorption function. Each side wall 4 is divided into upper and lower sides by a central circumferential groove 9 provided in the center of the upper side wall, a decompression absorption panel wall 8 is formed on the upper side wall 4, and a concave wall 5 is formed on the lower side wall 4. It has a configuration.

  In the case of this second embodiment, due to the depression deformation of the upper decompression absorption panel wall 8, the decompression that cannot be absorbed by the side wall 4 having the lower concave wall 5 is absorbed.

  In the above embodiment, the bottle body 3 has been described as a square cylinder. However, the body 3 is not limited to a square cylinder, and is a square cylinder such as a pentagonal cylinder or a hexagonal cylinder. May be.

  As described above, the synthetic resin bottle of the present invention can exhibit the reduced pressure absorption function in a state in which the deformation of the side wall against the internal pressure fluctuation is sufficiently suppressed without providing the reduced pressure absorption panel wall. The design range of external appearance can be expanded without being trapped by the vacuum absorption panel wall, and a wide range of usage development as a vacuum bottle is expected.

1; mouthpiece part 2; shoulder part 3; trunk part 4; side wall 5; concave wall 6; boundary part 7; square wall 8;

Claims (4)

In a square bottle made of synthetic resin, which is a stretch blow molded product, with a mouth tube portion standing up through a shoulder portion at the upper end of a rectangular tube barrel body whose bottom is closed at the bottom, each side surface of the body portion A synthetic resin square bottle in which a wall is formed into a curved wall structure that is depressed with a large curvature, and a concave wall having a flat wall structure is formed at the center of the side wall. The square bottle made of synthetic resin according to claim 1, wherein the concave wall has a shape that becomes narrower as it approaches the upper end or lower end of the side wall. The synthetic resin square bottle according to claim 1 or 2, wherein a central circumferential groove is formed in the body portion, and a concave wall is formed in a configuration connected to the central circumferential groove. Claims: A body part is vertically divided by forming a central circumferential groove, one side wall of the body part partitioned above and below is configured as a vacuum absorbing panel wall, and a concave wall is formed on the other side wall. The square bottle made of synthetic resin according to any one of 1 to 3.

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