JP2009241971A - Synthetic resin-made square bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin-made square bottle capable of suppressing any dent of a corner surface part to a non-restorable degree even when the bottle is thin-walled. <P>SOLUTION: The synthetic resin-made square bottle 10 has a barrel portion 11, in which a panel surface part 15 and a corner surface part 16 are alternately and continuously provided along the bottle circumference. The outer surface of at least the corner surface part 16 of the barrel portion 11 forms a roughened surface 11a formed by a die surface subjected to the surface roughing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a square bottle made of synthetic resin.

2. Description of the Related Art Conventionally, a square bottle made of a synthetic resin having a body portion in which panel surface portions and corner surface portions are alternately arranged along the circumferential direction of a bottle as shown in, for example, Patent Document 1 below is known. .
JP 2005-8153 A

By the way, in recent years, in this type of bottle, for example, from the viewpoint of environmental measures and cost reduction, a reduction in the thickness of the synthetic resin used has been studied. When gripping, transporting in a filling process, packing process, etc., or when the inside of a bottle is decompressed, there is a possibility that it becomes easy to dent to the extent that it cannot be restored starting from the part where the sink mark has occurred.
In particular, in the case of a square bottle, since the corner surface portion has the maximum diameter portion of the bottle, an external force is likely to be applied to the corner surface portion, and the corner surface portion is smaller than the area of the panel surface portion. Not only when the force acts directly on the panel surface, but also when the force acting on the panel surface part propagates to the corner surface part beyond the ridge line part between the corner surface part and the panel surface part, the corner surface part is dented to such an extent that it cannot be restored. There was a risk of becoming easier.

  The present invention has been made in consideration of such circumstances, and it is intended to provide a square bottle made of synthetic resin that can prevent the corner surface portion from being dented to the extent that it cannot be restored even if formed thin. Objective.

  In order to solve the above-described problems and achieve such an object, the synthetic resin square bottle of the present invention has a body portion in which panel surface portions and corner surface portions are alternately arranged along the peripheral direction of the bottle. A square bottle made of synthetic resin having at least the outer surface of the corner surface portion of the body portion is a roughened surface formed by a roughened die surface. It is characterized by that.

In this invention, since the outer surface of the corner surface portion is the roughened surface, the outer surface side of the corner surface portion can be provided with flexibility to easily exert an elastic force. Accordingly, even if a force acts on the corner surface portion, the corner surface portion can absorb this force without causing the corner surface portion to be dented to an extent that cannot be restored.
Furthermore, since the outer surface of the corner surface portion is molded with a roughened mold surface, it is possible to suppress the outer surface of the corner surface portion from being in close contact with the mold surface. The mold releasability from the mold can be improved. Therefore, it is possible to reduce the force acting on the corner surface portion when the mold is opened, and it is possible to suppress the occurrence of sink marks at the corner surface portion.
As described above, even if the square bottle is formed thin, it is possible to prevent the corner surface portion from being dented to the extent that it cannot be restored.

Here, the panel surface portion and the corner surface portion may be alternately arranged along the circumferential direction of the bottle via the ridge line portion, and the roughening treatment surface may straddle the outer surface of the ridge line portion in the bottle circumferential direction. .
In this case, since the roughened surface straddles the outer surface of the ridge line part between the panel surface part and the corner surface part in the bottle circumferential direction, the force acting on the panel surface part will propagate to the corner surface part beyond the ridge line part. This force can be absorbed on the outer surface side of the ridge line portion.

  According to the square bottle made of synthetic resin according to the present invention, it is possible to prevent the corner surface portion from being dented to the extent that it cannot be restored even if it is formed thin.

Embodiments of the present invention will be described below with reference to the drawings. In the synthetic resin square bottle 10 according to the present embodiment, a bottom portion 12, a body portion 11, a shoulder portion 13 and a mouth portion 14 are provided in this order along the bottle axis O direction, and for example, polyethylene terephthalate, polypropylene, or the like. The synthetic resin is integrally formed. Further, the bottom portion 12, the trunk portion 11, the shoulder portion 13, and the mouth portion 14 are arranged coaxially with the bottle axis O. The square bottle 10 is formed by biaxial stretch blow molding, for example. Further, in the illustrated example, the trunk portion 11 and the shoulder portion 13 are connected via a taper portion 19 whose inclination angle with respect to the outer surface of the trunk portion 11 is smaller than that of the shoulder portion 13.
Hereinafter, the bottom 12 side is referred to as the lower side along the bottle axis O direction, and the mouth 14 side is referred to as the upper side.

  A portion extending from the bottom portion 12 to the shoulder portion 13 along the bottle axis O direction has a panel surface portion 15 and a corner surface portion 16 narrower than the width of the panel surface portion 15, that is, the size in the bottle circumferential direction. It is configured to be alternately arranged along the circumferential direction of the bottle via the portion 17. Thereby, the top view shape and the bottom view shape of the bottle 10 are polygonal shapes as shown in FIGS. 2 and 3.

  The bottom surface 12a of the bottom portion 12 has a flat ground surface 12b located at the outer peripheral edge thereof, and a recessed portion 12c that is located on the inner side of the ground surface 12b in the bottle radial direction and is recessed toward the inside of the bottle 10. , Is formed. In addition, a plurality of reinforcing convex ribs 12d are formed on the surface of the recess 12c at intervals around the bottle axis O.

  Further, four panel surface portions 15 and four corner surface portions 16 are provided. And each panel surface part 15 is arrange | positioned so that the other panel surface part 15 may be opposed in a bottle radial direction. Each corner surface portion 16 is also arranged so as to face another corner surface portion 16 in the bottle radial direction.

  Here, an annular concave rib 18 extending over the entire circumference is formed in the lower portion of the body portion 11. Further, the length of the body portion 11 located above the annular concave rib 18 is longer in the bottle axis O direction than the portion located below the annular concave rib 18. And the decompression absorption panel part 15c is formed in the panel surface part 15 of the trunk | drum 11 in the part located in the upper part of the cyclic | annular concave rib 18, and the part located in the lower part, respectively.

  In the present embodiment, at least the outer surface of the corner surface portion 16 of the body portion 11 is a roughened surface 11a formed by a roughened die surface. In the example shown in the drawing, the roughened surface 11a has a reduced pressure absorbing panel 15c at the portion located on the upper side of the annular concave rib 18 on the outer surface of the body 11 as shown by hatching in FIG. Except for the entire area.

  Here, examples of the rough surface processing applied to the mold surface include a texture processing and a blast processing. Further, the roughened surface 11a is configured by forming a large number of minute uneven portions as shown in FIG. Furthermore, the surface roughness of the roughened surface 11a was measured using a laser focus displacement meter (LT-8010) manufactured by Keyence Corporation. The surface roughness in the present embodiment was 55 μm to 75 μm, and was 65 μm on average (corresponding to the maximum height Rz of JIS B0601).

  As described above, according to the synthetic resin square bottle 10 according to the present embodiment, the outer surface of the corner surface portion 16 is the roughened surface 11a, so that the outer surface side of the corner surface portion 16 is flexible. It becomes possible to make it easy to exhibit elasticity by providing the property. Therefore, even if a force is applied to the corner surface portion 16, the corner surface portion 16 can absorb this force without causing the corner surface portion 16 to be dented to the extent that it cannot be restored.

Furthermore, since the outer surface of the corner surface portion 16 is molded with a roughened mold surface, it is possible to suppress the outer surface of the corner surface portion 16 from being in close contact with the mold surface, The releasability of the bottle 10 from the mold can be improved. Therefore, it is possible to reduce the force acting on the corner surface portion 16 when the mold is opened, and it is possible to suppress the occurrence of sink marks on the corner surface portion 16.
As mentioned above, even if this square bottle 10 is formed thin, it can suppress that the corner surface part 16 is dented to the extent which cannot be restored | restored.

  Moreover, in this embodiment, in the part located in the upper part of the annular concave rib 18 among the outer surfaces of the trunk | drum 11, the whole area except the decompression absorption panel part 15c becomes the roughening process surface 11a, This rough surface Since the process surface 11a straddles the outer surface of the ridge line portion 17 in the bottle circumferential direction, when the force acting on the panel surface portion 15 tries to propagate to the corner surface portion 16 beyond the ridge line portion 17, this force is applied to the ridge line. It can be absorbed on the outer surface side of the portion 17.

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, in the above-described embodiment, in the portion located on the upper side of the annular concave rib 18 in the outer surface of the body portion 11, the entire area excluding the reduced pressure absorption panel portion 15c is the roughened surface 11a. Of the portions to be processed, only the corner surface portion 16 may be the roughened surface 11a.
Alternatively, the entire surface of the outer surface of the body portion 11 except for the reduced pressure absorption panel portion 15c may be used as the roughened surface 11a in the portion located below the annular concave rib 18. In this case, only the corner surface portion 16 among the portions located on the lower side may be the roughened surface 11a.

Furthermore, the outer surface of the corner surface portion 16 in the body portion 11 may be a roughened surface 11 a over the entire area excluding the annular concave rib 18.
Further, when the outer surface of the corner surface portion 16 in the body portion 11 is a roughened surface 11a, the roughened surface 11a is connected not only to the corner surface portion 16 but also to the corner surface portion 16 in the bottle circumferential direction. It is preferable to form also on the outer surface of a pair of ridgeline part 17. FIG.

Furthermore, in the said embodiment, although the trunk | drum 11 and the shoulder part 13 were connected via the taper part 19, the square bottle which does not have this taper part 19 may be employ | adopted.
Moreover, in the said embodiment, although the annular concave rib 18 was formed in the trunk | drum 11, this annular concave rib 18 does not need to be formed. And you may make the outer surface of the corner surface part 16 in the trunk | drum 11 into the roughening process surface 11a over the whole region.

  Even if it is formed to be thin, it is possible to prevent the corner surface portion from being dented to the extent that it cannot be restored.

It is a front view of the square bottle made from a synthetic resin shown as one embodiment concerning the present invention. It is a top view of the synthetic resin square-shaped bottle shown in FIG. It is a bottom view of the synthetic resin square bottle shown in FIG. It is a partially expanded longitudinal cross-sectional view of the synthetic resin square bottle shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Synthetic resin square bottle 11 Body 11a Roughening surface 12 Bottom 13 Shoulder 14 Mouth 15 Panel surface 16 Corner surface 17 Edge line O Bottle axis

Claims (2)

A square bottle made of synthetic resin having a body portion in which panel surface portions and corner surface portions are alternately arranged along the circumferential direction of the bottle,
A synthetic resin square bottle characterized in that at least the outer surface of the corner surface portion of the body portion is a roughened surface formed by a roughened mold surface. The square bottle made of synthetic resin according to claim 1,
The panel surface portion and the corner surface portion are alternately arranged along the circumferential direction of the bottle via the ridge line portion,
The synthetic resin square bottle characterized in that the roughened surface is straddling the outer surface of the ridge line portion in the bottle circumferential direction.

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