JPH10203520A - Plastic bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blow mold container, the panel face of whose body side wall does not break easily comparatively by the outer pressure applied on the face area of the container. SOLUTION: The body part of this blow mold plastic bottle 10 is formed by combining a body wall OP, a rib SR projecting inward from the body wall and also extending in a peripheral direction and a recessed face part O projecting inward from the body wall OP. At least 1 combination out of the combinations, the body wall OP combined with the body wall OP, the rib SR combined with the rib SR, the recessed face part O combined with the recessed face part O, the body wall OP combined with the recessed face part O or the rib SR combined with the recessed face part O, is joined with a joining rib TR projecting inward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-molded container in which a side wall panel of a trunk is hardly crushed in a physical distribution process.

[0002]

2. Description of the Related Art Conventionally, bottle-shaped blow-molded containers have been used in a wide range of fields such as fruit juice drinks, mineral water, carbonated drinks and seasonings. In terms of capacity, most are 0.5 to 2 liters, but are also used for large containers exceeding 2 liters. Above all, biaxially stretch blow molded containers using a polyester resin are frequently used. that is,
By biaxially stretching parts other than the bottleneck,
This is because while being thin, the body side wall panel can have rigidity and is excellent in content resistance, surface properties, and the like. This rigidity is due to three-dimensional formation of the side wall panel by means such as providing a plurality of linear ribs in the circumferential direction on the body side wall panel and further providing a rectangular recess in the vertical direction, in addition to the biaxial stretching. By these means, the blow-molded container is prevented from being swollen and deformed due to internal or external pressure. Japanese Utility Model Publication No. 6-44806 proposes means for preventing deformation of a container due to a decrease in internal pressure.

[0003]

However, the conventional blow container in which the body side wall panel surface is made three-dimensional to increase rigidity,
Deformation due to internal pressure applied to a large area over a plurality of ribs or external pressure is certainly resistant and hardly deformed. For example, deformation due to internal pressure applied to the entire side wall panel, such as blistering, and deformation due to lateral pressure applied to the surface of each blow container side wall panel when packed and transported in an external cardboard or the like, are not easily received. However, against a pressing force and an impact from the outside due to a small area that hits only one or two ribs, the ribs are kicked and the side wall panel surface is easily crushed and deformed, so that the ribs are once deformed. The collapse does not recover and remains to the end. Therefore, there is a problem that a crushed product that has occurred during distribution has a poor appearance, loses product value, and remains unsold. In Japanese Utility Model Publication No. 6-44806,
A vertically long recess is formed in a local area where the internal pressure drops and the stress is concentrated after hot filling, and a limited local area is reinforced to strengthen the entire container. It does not prevent crushing due to a typical pressing force.
The present invention has been made in view of the above-mentioned problems, and has as its object to provide a blow-molded container in which a side wall panel surface is not easily crushed by partial external pressure and impact.

[0004]

According to the present invention, there is provided a blow molding method, wherein a trunk portion extends in a circumferential direction while projecting inward from a trunk wall. A plastic bottle configured by combining a rib and a concave portion protruding inward from the trunk wall,
At least one combination of the body walls, the ribs, the concave surfaces, the body wall and the rib, the body wall and the concave surface, or the combination of the rib and the concave surface protrudes inward. It is configured to be connected by connecting ribs.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is a functional explanatory view of a plastic bottle according to the present invention. FIG. 1A is a front view of an embodiment of a plastic bottle 10 according to the present invention, and the rear surface appears in exactly the same way, so that it is omitted. As shown in FIG. 1A, the body of the prismatic bottle has a body wall OP and a body wall OP.
And ten concave ribs O projecting inward from the body wall and projecting inward from the body wall. The planar shape of the rib SR is generally straight, but may be partially curved or partially discontinuous. Further, the width is not always constant depending on the portion as shown in FIG. In the front and rear side wall panels, a rectangular concave portion O (which may be regarded as a wide rib) partitioned by a step D is formed shallower than the rib SR. Furthermore, on the upper part of the concave portion O,
A gentle concave portion KP is provided to prevent deformation due to the pressing force. Each of the rib SR, the concave portion O, and the gentle concave portion KP functions to impart rigidity to the body and increase the strength of the entire bottle. The plastic bottle 10 according to the present invention is obtained by adding the following connection rib TR in addition to the above structural elements. The connection rib TR connects the body walls OP, the ribs SR, the concave portions O, the body wall OP and the rib SR, the body wall OP and the concave portion O, or the combination of the rib SR and the concave portion O. , Similarly to the horizontal rib SR in FIG. As shown in FIG. 1, the connection rib TR1
Connects the ribs SR, and the connection rib TR2 is
Rib SR and gentle concave surface KP, and connection rib TR
Reference numeral 3 connects the body walls OP. It is not necessary to provide these connection ribs TR for all of the combinations described above, and it is sufficient to select necessary ones in consideration of the bottle shape, application, surface design, and the like, and to appropriately use the necessary parts.
In the embodiment of the plastic bottle 10 according to the present invention shown in FIG. 1, the connecting rib TR3 is not actually used, but is shown below for reference. FIG.
(B) shows an xx ′, yy ′, zz ′ cross section of the side wall panel that passes through the connection ribs TR1, TR2, and TR3. In the figure, the right side is the inside of the bottle.

When a pressing force is applied from the outer surface to a small pressing force portion P substantially at the center of the bottle body having the above-described structure and pushed into the bottle, when the conventional rib SR alone is applied, the pressure is limited. After that, the rib SR first broke and the phenomenon that the crushing spread from there was seen. However, in the plastic bottle according to the present invention, the crushing phenomenon did not occur at the pressure of this limit, and the body wall panel surface passed this limit. The crushing phenomenon can be seen only after being pushed considerably inside. In other words, the buckling strength of the body wall panel surface is increased, and the body wall panel is hardly crushed. This is because the stress acting on the pressing portion P propagates in the vertical direction by the connection ribs TR1 and TR2, leading to stress dispersion. That is, the stress caused by the pressing force is applied to the rib S
This is because the upper and lower ribs SR and the wall surface OP and the like connected via the connection ribs TR1 and TR2 at the same time as R can be absorbed. The region having the effect of preventing crushing covers at least the entire portion connected by the connection ribs TR1 to TR3. In the case of a prismatic container, the four corners are rigid and are unlikely to be crushed, but the provision of the above crush prevention means on the front, back, and both side surfaces where crush is likely to occur is effective in preventing the crush of the side wall panel surface. is there. By using this means, a bottle whose buckling strength is not so different from that of a conventional bottle can be manufactured with a body side wall panel thinner than that of a conventional bottle, and it is possible to promote reduction in the amount of the bottle.

In the case of a biaxially stretched blow bottle made of polyethylene terephthalate resin having a capacity of 2 liters and a total weight of 60 g, the width of the connection ribs TR1 to TR3 is 2 to 10 mm, preferably 3 to 7 mm, and the depth is about 10 cm. 1m from wall
m or more and 5 mm or less from the connection surface. Connection rib T
Preferably, the horizontal cross-sectional shape of R does not have an acute angle. The reason is to prevent the pressing force from being concentrated on the acute angle portion of the connection rib TR and being deformed.

[0008]

FIG. 2 is a dimensional view of an embodiment of a plastic bottle according to the present invention. Using polyethylene terephthalate resin, biaxially stretched blow molding was used to prepare ten example samples having an internal capacity of 2 liters and a total weight of 60 g and having the dimensions shown in FIG. The connection rib TR
The positions of 1 and TR2 are as shown in FIG. 2, and the length, width and depth of the deepest portion are 2 in the case of the connection rib TR1, respectively.
In the case of 2 mm, 4 mm, and 4 mm, and the connection rib TR2, they were 12 mm, 4 mm, and 4 mm, respectively. In addition, although there was no connection rib TR described above, ten comparative example samples having exactly the same other specifications were prepared. A small disk having a diameter of 10 mm is applied to a pressing portion P substantially at the center of the front side wall panel of the above sample to apply pressure, and the pressed horizontal rib SR is broken, and the buckling strength at which the central portion is crushed and cannot be restored is reduced. As a result of the measurement, the average value was as follows. Example Sample Comparative Example Sample Pressure at which crushing occurred 5.5 kg · f 2.5 kg · f 10 mm 5 mm before crushing occurred Pressed distance From the above test, the plastic bottle 10 according to the present invention was obtained.
It was found that the side wall panel surface was not easily crushed by external pressure or impact on a relatively small portion.

[0009]

According to the plastic bottle 10 of the present invention, by forming the connection rib TR on at least a part of the body side wall panel surface, the portion connected by the connection rib TR can be compared from the outside. It is possible to provide a bottle that is not easily crushed by a pressing force or an impact applied to a target small area, and does not impair the appearance, so that the commercial value can be maintained to the end.

[Brief description of the drawings]

FIG. 1 is a functional explanatory view of a plastic bottle according to the present invention.

FIG. 2 is a dimensional drawing of an embodiment of a plastic bottle according to the present invention.

[Explanation of symbols]

 D Step O Concave part P Pressing part KP Loose concave part OP Body wall SR Rib TR1-3 Connecting rib 10 Plastic bottle according to the present invention

Claims (1)

[Claims] 1. A body formed by blow molding, wherein a body portion includes a body wall,
A plastic bottle configured by combining ribs that protrude inward from the trunk wall and extend in the circumferential direction, and concave portions that protrude inward from the trunk wall, wherein the body walls, the ribs, and the concave surface are combined. Plastics characterized in that at least one of the parts, the body wall and the rib, the body wall and the concave surface part, or the combination of the rib and the concave surface part is connected by a connection rib projecting inward. Bottle.