JP2013095428A - Synthetic resin-made blow bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin-made blow bottle which does not cause crushed deformation at the upper pressure-reducing absorbing walls even when an external shock is applied, and has high rigidity.SOLUTION: The synthetic resin-made blow bottle includes a mouth part 1 forming the spouting port of contents, a shoulder part 2 which is connected with the mouth part 1 and whose diameter is enlarged downward, a body part 3 connected with the shoulder part 2 via annular groove parts m, m, and a bottom part 6 connected with the lower end of the body part 3, and cooperating with the shoulder part 2 and body part 3 to form a space to be filled with contents inside them. The body part 3 includes a plurality of pressure-reducing absorbing walls 5 each having an acute-angle part 5and an obtuse-angle part 5at the end of an upper side 5and formed of an inclined panel having an inclination θ with respect to the axial center L of the bottle, and column walls 4 positioned between the pressure-reducing absorbing walls 5 and formed along the periphery of the body part 3 and arranged alternately with the pressure-reducing absorbing walls 5. The body part 3 is provided with short reinforcing ribs 7 extending along the annular groove parts m, m, right above the obtuse-angle parts 5.

Description

  The present invention relates to a synthetic resin blow bottle formed by biaxial stretch blow molding, and more particularly to a synthetic resin blow bottle in which column walls and reduced pressure absorption walls are alternately arranged in a body portion.

  Synthetic resin blow bottles typified by plastic bottles are lightweight and easy to handle, and can ensure transparency and exhibit an appearance comparable to glass containers, In addition, since it is inexpensive, it has been widely used in recent years as a container for storing food, beverages, cosmetics, drugs, and the like.

  By the way, in this type of container, from the viewpoints of further cost reduction, reduction of garbage, etc., the thickness of the bottle is reduced in order to minimize the amount of resin used per bottle.

  However, in the case of heat-resistant blow bottles that have a vacuum absorption wall in the bottle body, it is particularly inclined with respect to the axis of the bottle, such as improving the vacuum absorption capacity and diversifying the design. For example, when the vacuum absorbing wall is formed by an inclined panel as disclosed in Patent Document 1, depending on the contour shape, when an external impact force (lateral load) is applied during handling or transportation , There is a problem that deformation (breaking) occurs from the upper side of the inclined panel to the boundary of the shoulder (particularly, in the upper side corner of the inclined panel, the angle formed between the upper side and the side connected thereto is an obtuse angle. In the case).

  The crushing deformation can be prevented by shortening the distance between the annular groove formed at the boundary between the shoulder portion and the body portion of the bottle and the upper side of the inclined panel. At this time, it becomes difficult to form the annular groove into the intended shape (deteriorating formability), and the function (reinforcing function) inherent to the annular groove may not be effectively exhibited.

JP 2007-269359 A

  An object of the present invention is to make a synthetic resin that can reliably avoid the above-described crushing deformation that may occur immediately above the vacuum absorbing wall even when an external impact force is applied without impairing the formability in blow molding. Proposed blow bottle.

  The present invention includes a mouth neck that forms a spout for contents, a shoulder that is connected to the neck and expands toward the lower portion, a trunk that is connected to the shoulder via an annular groove, and a A synthetic resin blow bottle connected to the lower end and having a bottom portion that cooperates with the shoulder portion and the barrel portion to form a filling space for contents therein, the barrel portion being an end portion of the upper side Each of which has an acute angle portion and an obtuse angle portion, and is formed between a plurality of reduced pressure absorption walls formed by an inclined panel inclined with respect to the axis of the bottle, and the barrel is located between the reduced pressure absorption walls. A columnar wall alternately arranged with the reduced pressure absorption wall along the circumference of the portion, and provided with a short reinforcing rib extending along the annular groove portion at a position directly above the obtuse angle portion of the trunk portion This is a synthetic resin blow bottle.

  In the synthetic resin blow bottle having the above-described configuration, it is preferable that the reinforcing rib is a groove portion in which the upper wall surface of the body portion of the bottle is recessed toward the filling space.

  Further, the circumferential length of the reinforcing rib should be the same length as the upper side of the vacuum absorbing wall, and the central part in the longitudinal direction should be located immediately above the obtuse angle part, in particular, more than half of the reinforcing rib should be on the upper side It is preferable to position. Thereby, it can suppress that a shaping property is impaired in the case of blow molding.

  According to the synthetic resin blow bottle of the present invention having the above-described configuration, since the short reinforcing rib is provided immediately above the obtuse angle portion, the strength of the portion is reduced without shortening the distance between the annular groove portion and the inclined panel. Therefore, even if an external impact force is applied to the part during handling, transportation, etc., it is possible to avoid the occurrence of crushing deformation.

  Further, according to the blow bottle made of synthetic resin according to the present invention, the short reinforcing rib is formed by the groove portion in which the upper wall surface of the trunk portion is recessed toward the filling space. Is preserved.

It is the figure which showed typically Embodiment of the synthetic resin blow bottles according to this invention.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a view schematically showing a side surface of a synthetic resin blow bottle according to the present invention.

In the figure, reference numeral 1 denotes a mouth and neck portion that forms a spout for contents, 2 denotes a shoulder portion that is connected to the mouth and neck portion 1 and expands toward the lower portion, and 3 denotes an annular groove m ₁ , m _{2 in the} shoulder portion _2. It is the cylindrical trunk | drum connected via. In this example, the body portion 3 is shown as having a drum-shaped, thin shape in which the diameter at the center of the body portion is smaller than the diameters of the upper end and the lower end thereof.

  The body 3 is extended at an angle θ from its upper end to its lower end, and is provided with a plurality of column walls arranged at intervals around it (in this example, six column walls provided at intervals of 60 °) 4) and a decompression absorbing wall 5 that is positioned between the column walls 4 and stably holds the appearance of the bottle by preferential displacement accompanying decompression in the bottle. Yes.

The decompression absorbing wall 5 is formed by denting the inner side wall 5b having an annular stepped wall 5a as an outline toward the filling space, and the top of the upper side 5c is rounded at the top. The acute angle part 5c ₁ and the obtuse angle part 5c ₂ are respectively provided, and the end part of the lower side 5d is provided with the acute angle part 5d ₁ and the obtuse angle part 5d ₂ which are opposite to the upper side 5c ₁ , The whole is configured as a parallelogram-shaped inclined panel inclined at an angle θ with respect to the axis L of the bottle.

Here, the acute angle portion 5c ₁ (5d ₁ ) means an angle portion where the angle formed by the upper side 5c (lower side 5d) and the side 5e is an acute angle, and the obtuse angle portion 5c ₂ (5d ₂ ) and Means the corner where the angle between the upper side 5c (lower side 5d) and the side 5e becomes an obtuse angle.

In addition, 6 is connected to the lower end of the body part 3 through the annular groove part m ₃ , and cooperates with the shoulder part 2 and the body part 3 to form a filling space for the contents inside, and 7 is a body part. parts 3, directly above the position of the obtuse angle portion 5c ₂ of the upper side 5c of the inclined panel, and a reinforcing rib of short provided immediately below the annular groove m _2.

The short reinforcing rib 7 includes a groove portion extending along the annular groove portions m ₁ and ₂ .

  Further, 8a and 8b are formed on the inner wall 5b so as to reach the side 5e along the upper side 5c and the lower side 5d, and have an inverted U-shape and U-shape to prevent local buckling of the inclined panel. It is a reinforcing rib (narrow groove).

In the synthetic resin blow bottle having the above-described configuration in which the reduced pressure absorption walls 5 and the column walls 4 are alternately arranged, the column wall 4 is located below the acute angle portion 5 c _1. Even if an external impact force is applied to the bottle during transportation, it does not easily deform.

However, since the inner wall 5c having a substantially smooth surface is positioned below the obtuse corner 5c ₂ , the reduced pressure absorption wall 5 is easily bent, and the bottles are formed in the annular grooves m ₁ , ₂ , ₃ . In this type of blow bottle that complements the strength in the radial direction, there is a concern that when an external impact force is applied to the upper part of the reduced pressure absorbing wall 5, it will cause crushing deformation.

In the present invention, since the short reinforcing rib 7 is provided at a position immediately above the obtuse angle portion 5c ₂ in the trunk portion 3 (between the reduced pressure absorption wall 5 and the annular groove portion m ₂ ), even if an external impact force is applied. As a result of the bending of the reduced pressure absorbing wall 5 being suppressed by the reinforcing rib 7, it is possible to reliably avoid crushing deformation.

Short reinforcing ribs 7, the longitudinal center well the cause is positioned immediately above the obtuse angle portion 5c _2, also the circumferential length is, preferably, a equivalent to the upper side 5c length. Molding Accordingly, the (intended cross-sectional shape can be prevented from formability is impaired during the blow molding it is provided with short reinforcing ribs 7 between the vacuum absorption wall 5 and the annular groove m ₂ can do).

The reinforcing rib 7 has at least the circumferential width of the obtuse corner 5c ₂ (distance in the circumferential direction from the connecting part with the upper side 5c to the connecting part with the side 5e), and the obtuse angle part 5c ₂ is upward. However, it may be shorter than the circumferential width according to the rigidity of the bottle.

In the bottle as described above掲図1, the upper end of the body portion 3 (between the annular groove m ₂ and the upper side 5c), projecting radially outward, forming a step between the Hashirakabe 4 Although an example in which an annular convex portion is provided and the reinforcing rib 7 is formed on the annular convex portion is shown, the annular convex portion may not be provided. In this case, the annular convex portion is formed continuously with the column wall 4. The reinforcing rib 7 is formed on the upper peripheral wall of the body portion 3.

  A PET bottle as shown in FIG. 1 having a filling capacity of 500 ml filled with contents (formed with short reinforcing ribs having a groove width of 2 mm, a depth of 0.5 mm, and a peripheral length of 18 mm) is boxed ( 24 carton) and test according to the JIS Z 0205 tilt impact test (travel distance measurement interval is 10 cm and the distance is extended until the bottle is crushed) We investigated the occurrence of deformation.

  As a result, in the comparative bottle without the short reinforcing rib, when the travel distance reached 70 cm, the five bottles were crushed and deformed at the upper part of the vacuum absorbing wall (upper part of the obtuse angle part). On the other hand, in the bottle according to the present invention, it was confirmed that no crushing deformation occurred.

  In the test of the bottle according to the present invention, in the test where the travel distance was 90 cm, three bottles deformed on the shoulder part of the bottle caused crushing deformation at the upper part of the reduced pressure absorption wall (upper part of the obtuse angle part). It was confirmed that there was only one.

  ADVANTAGE OF THE INVENTION According to this invention, even if an external impact force is added at the time of handling or conveyance, the highly rigid synthetic resin blow bottle which does not crush and deform | transform in the upper part of a pressure-reduction absorption wall can be provided.

DESCRIPTION OF SYMBOLS 1 Mouth neck part 2 Shoulder part 3 Trunk part 4 Column wall 5 Depressurization absorption wall 5a Step wall 5b Inner side wall 5c Upper side 5c ₁ Acute angle part 5c ₂ Obtuse angle part 5d Lower side 5d ₁ Acute angle part 5d ₂ Obtuse angle part 6 Bottom part 7 Reinforcement Rib m ₁ Annular groove m ₂ Annular groove m ₃ Annular groove L Axle

Claims (2)

The neck and neck that form the spout of the contents, the shoulder that is connected to the neck and neck and expands toward the lower part, the trunk that is connected to the shoulder through an annular groove, and the lower end of the trunk, A synthetic resin blow bottle provided with a bottom part that forms a filling space for contents inside the shoulder part and the body part,
The body part has an acute angle part and an obtuse angle part at an end part of the upper side, and a plurality of reduced pressure absorption walls formed by an inclined panel inclined with respect to the axis of the bottle, and the reduced pressure absorption wall A columnar wall arranged alternately with the reduced pressure absorption wall along the circumference of the trunk portion,
A synthetic resin blow bottle, characterized in that a short reinforcing rib extending along the annular groove is provided at a position directly above the obtuse corner of the trunk.   2. The synthetic resin blow bottle according to claim 1, wherein the reinforcing rib includes a groove portion in which an upper wall surface of the body portion is recessed toward the filling space.

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